Teyfik DEMİR, Mustafa ÜBEYLİ and R. Orhan YILDIRIM
TOBB ETU Mechanical Engineering, Söğütözü Cad. No:43, Ankara-TURKEY
Middle East Technical University, Mechanical Eng., Ankara-TURKEY
Effect of aging treatment on the ballistic behavor of aluminium alloy 7075 against 7.62 mm armor piercing projectiles
Microstructure and Abrasive Wear Properties of Chrome Alloy Steel IDES Editor
En 31 steel is widely used for applications like ball bearings and grinding media balls. The sliding wear properties of En 31 steel has been studied in the past, however the data on abrasive wear properties of En 31 steel is limited. En 31 steel was quenched and tempered at different tempering temperatures. Metallographic and hardness studies were carried out on heat treated samples. The hardened and tempered samples were tested using two body abrasive wear testing apparatus. The abrasive medium used in the present investigation was silicon carbide paper. The effect of normal load and sliding distance on wear loss of as received and heat treated specimens tempered at different tempering temperatures was investigated. The abrasive wear resistance of EN 31 steel with different hardness was compared under different test conditions. The worn out samples were observed by Scanning Electron Microscope to study morphology of worn surfaces. The abrasive wear resistance exhibited an increasing trend with increase in hardness and it was rationalized in terms of microstructure and the hardness.
Comparison of Fatigue Characteristic for AISI 1039 Steel with Surface Treatmentijceronline
Wear and fatigue resistance in steel components used in various industries can be improved by surface treatments. Coatings systems which are used for improving the mechanical properties, generally, decreased the components fatigue life due to micro cracks, that propagate through the substrate , it is possible to improve the fatigue resistance of a component by the application of shot peening treatment, whose compressive residual stresses delay or eliminate the initiation and propagation of fatigue cracks. The aim of this study is to obtain the fatigue limit of untreated, shot peened, and hard chromium coating of medium carbon steel AISI 1039 and comparison between them. Fatigue tests were carried out using small samples with 4 mm diameter, with hard chromium layer of (47.1) µm thick. Rotating-bending fatigue test was carried out on samples after shot peening with steel balls of about 20 minutes peening time. Experimental results showed that hard chromium electroplating decreased the fatigue life and fatigue limit in comparison with the uncoated steel. As the highest thickness for coating was 23µm. On the other hand, Shot peening Results indicated that the fatigue strengths of samples are increased and the highest fatigue limit was (298.566Mpa) after treated the samples by shot peening for 20 minutes.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Microstructure and Abrasive Wear Properties of Chrome Alloy Steel IDES Editor
En 31 steel is widely used for applications like ball bearings and grinding media balls. The sliding wear properties of En 31 steel has been studied in the past, however the data on abrasive wear properties of En 31 steel is limited. En 31 steel was quenched and tempered at different tempering temperatures. Metallographic and hardness studies were carried out on heat treated samples. The hardened and tempered samples were tested using two body abrasive wear testing apparatus. The abrasive medium used in the present investigation was silicon carbide paper. The effect of normal load and sliding distance on wear loss of as received and heat treated specimens tempered at different tempering temperatures was investigated. The abrasive wear resistance of EN 31 steel with different hardness was compared under different test conditions. The worn out samples were observed by Scanning Electron Microscope to study morphology of worn surfaces. The abrasive wear resistance exhibited an increasing trend with increase in hardness and it was rationalized in terms of microstructure and the hardness.
Comparison of Fatigue Characteristic for AISI 1039 Steel with Surface Treatmentijceronline
Wear and fatigue resistance in steel components used in various industries can be improved by surface treatments. Coatings systems which are used for improving the mechanical properties, generally, decreased the components fatigue life due to micro cracks, that propagate through the substrate , it is possible to improve the fatigue resistance of a component by the application of shot peening treatment, whose compressive residual stresses delay or eliminate the initiation and propagation of fatigue cracks. The aim of this study is to obtain the fatigue limit of untreated, shot peened, and hard chromium coating of medium carbon steel AISI 1039 and comparison between them. Fatigue tests were carried out using small samples with 4 mm diameter, with hard chromium layer of (47.1) µm thick. Rotating-bending fatigue test was carried out on samples after shot peening with steel balls of about 20 minutes peening time. Experimental results showed that hard chromium electroplating decreased the fatigue life and fatigue limit in comparison with the uncoated steel. As the highest thickness for coating was 23µm. On the other hand, Shot peening Results indicated that the fatigue strengths of samples are increased and the highest fatigue limit was (298.566Mpa) after treated the samples by shot peening for 20 minutes.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
EFFECT OF THERMAL EXPOSURE ON THE MECHANICAL AND WEAR PROPERTIES OF AEROSPACE...Journal For Research
Aluminum alloys are becoming increasingly important available data were utilized to prepare maps that are intended to serve to design Al Alloys with desired combination especially in the automotive and aerospace industries aluminum alloys AA6061 T6 is subjected to several combinations of solution treatments to correlate their mechanical tensile properties to hardness and conductivity measurement Additional the AA6061 T6 alloys were thermally exposed to several temperature to simulate heat damage effects the thermal exposure was correlated to the tensile properties and hardness and conductivity measurement however these materials tend to have poor wear resistance during working conditions study was to evaluate the wear behavior of Al alloys with various parameter by using pin-on-disk machine the wear rate was decreased then after database were created to consolidate the information about microstructure mechanical properties and corrosion behavior for Al Alloys.
Investigation of the distribution of lead in three different combinations of ...Rautomead Limited
The main objective of this paper was to assess three leaded
brass samples (pending application with Copper Development
Association) using optical microscopy and mass
spectrometry to compare the distribution of lead. Based on
the mass spectrometry data, a great deal of variation was
not found within each of the samples based on five different
sample locations. Optical microscopy, scanning electron
microscopy and energy-dispersive X-ray spectroscopy
confirmed that the lead was homogenously distributed in
brass.
Performance of Self Compacting High Strength Fiber Reinforced Concrete (SCHSFRC)IOSR Journals
In this experimental study the changes on some mechanical properties of self compacting concrete
specimen produced by silica fume, metakaolin, fly ash and steel fibers were investigated. The main objective of
this is to obtain ductile Self Compacting High Strength Concrete (SCHSC) which flows under its own weight
and homogeneity while completely filling any formwork and passing around congested reinforcement. The Self
Compacting High Strength Concrete produced by using silica fume, metakaolin, fly ash, steel fibers and
Polycarboxylatether base superplasticizer. Three types of steel fibers were used in the experiments and volume
fractions of steel fiber were 0.5% to 4.0 %. Addition of silica fume, metakaolin and fly ash into the concrete
were 2.5 %, 2.5 % and 10 % by weight of cement content respectively. Water/cement ratio was 0.29.
Compressive strength and split tensile strength tests were made on hardened concrete specimens.
System shear connector jakarta digunakan sebagai aplikasi dalam konstruksi bangunan untuk menghasilkan kekuatan coran beton lebih kuat dan stabil sesuai dengan perhitungan engineering civil. Dalam hal ini ada 2 hal perhitungan kekuatan secara umum yaitu kekuatan kelengketan stud pada batang baja sesudah dilas. Dan yang kedua adalah kekuatan stud bolt yang digunakan.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Effect of adding titanium oxide nanoparticles (TiO2) on structure, elastic moduli, Vickers hardness, internal friction, electrical
resistivity and thermal properties of tin-antimony-lead and tin-aluminum bearing alloys have been investigated. Elastic modulus, Vickers
hardness and thermal diffusivity of Sn87Sb10Pb3 and Sn80Al20 alloys increased after adding TiO2 nanoparticles. Internal friction, thermal
conductivity and specific heat of Sn87Sb10Pb3 and Sn80Al20 alloys varied after adding TiO2 nanoparticles. Adding titanium oxide nanoparticles
improved bearing properties, such as strengthens and internal friction of Sn87Sb10Pb3 and Sn80Al20 alloys. The Sn85.5Sb10Pb3(TiO2)1.5 alloy has
best properties for automotive industry. Also Sn78.5Al20(TiO2)1.5 alloy has best properties for marine applications.
To access the ballistic performance without executing real time test on targets / armour plates using sophisticated facility of experimental set up .
Thus the present investigation aims at developing suitable simulation for accessing the ballistic performance and comparing experimental findings with simulated results
Characteristics of Hypoeutectic Cu-Zr Alloy Rods Manufactured by Vertical Upw...Rautomead Limited
The focus in this study is therefore on applying a vertical upwards continuous casting (VUCC) mass-production
method to the pilot-scale manufacturing of Cu-Zr alloy rods. The microstructure and physical characteristics of these
VUCC rods were subsequently investigated and compared with rods produced by CMC. In addition, the wire-drawing
capability of the VUCC rods was examined, and the adaptability of the VUCC method to the mass production of
hypoeutectic Cu-Zr alloys was fully investigated.
2.
TRIBOLOGICAL CHARACTERISTICS OF ALUMINIUM HYBRID COMPOSITES REINFORCED WITH S...Blaza Stojanovic
This paper presents tribological characteristics of hybrid composites with aluminium
matrix, reinforced with silicon carbide (SiC) and graphite (Gr). Newly
formed Al/SiC/Gr hybrid composites are the combination of the two different hybrid
materials. Namely, hard particles of silicon carbide increase the hardness and
resistance to wear, while soft particles of graphite improve lubrication and reduce
friction coefficient and wear. It is possible to obtain Al/SiC/Gr hybrid composites
by different methods of casting. Tribological tests show that load, sliding speed,
sliding distance, content and size of reinforcement particles influence the size
and the type of wear and friction coefficient of Al/SiC/Gr hybrid composites with
aluminium matrix.
STRENGTHENING OF NORMAL AND HIGH STRENGTH CONCRETE CORBELS WITH HORIZONTAL AN...IAEME Publication
In this study, there were two modes of applying the carbon fiber strips on reinforced concrete corbels: the first one is application three horizontal strips and its width is (50 mm) and the other is applying three inclined strips with angle about (45°), the both modes applied on the two faces of concrete corbel specimens. Two types of concrete were used in this study; normal strength (28 MPa) and high strength concrete (57 MPa). Each types strengthening with two modes of carbon fiber stripes.
The ultimate and cracking capacity of tested specimens were improved as a result of strengthening with carbon fiber strips, in addition to development of energy absorption and stiffness characteristics.
A Review on Mechanical and Wear Properties of Heat Treated SteelIJSRD
This Review Paper describes effects of heat treatment on various material by varying process parameters and by using different types of heat treatment process. The heat treatment includes heating & cooling operations or the sequence of two or more such operations applied to any material in order to modify metallurgical structure and alter its physical, mechanical and chemical properties. This Review paper shows progress and research in the field of heat treatment process. Different types of heat treatment processes such as annealing, normalising, nitriding, hardening, tempering carburising used & available in recent time. This paper deals with important progress work on heat treatment and its process parameters.
In the material testing laboratory, a Charpy impact test was performed on three different types (hot,cold,and steel alloy)of steels testing each variety at four different temperatures (32°C(RT), 100°C,0°C and -22°C ). From results (shown below), we determined that the a transition is from ductile failures to brittle failures
EFFECT OF THERMAL EXPOSURE ON THE MECHANICAL AND WEAR PROPERTIES OF AEROSPACE...Journal For Research
Aluminum alloys are becoming increasingly important available data were utilized to prepare maps that are intended to serve to design Al Alloys with desired combination especially in the automotive and aerospace industries aluminum alloys AA6061 T6 is subjected to several combinations of solution treatments to correlate their mechanical tensile properties to hardness and conductivity measurement Additional the AA6061 T6 alloys were thermally exposed to several temperature to simulate heat damage effects the thermal exposure was correlated to the tensile properties and hardness and conductivity measurement however these materials tend to have poor wear resistance during working conditions study was to evaluate the wear behavior of Al alloys with various parameter by using pin-on-disk machine the wear rate was decreased then after database were created to consolidate the information about microstructure mechanical properties and corrosion behavior for Al Alloys.
Investigation of the distribution of lead in three different combinations of ...Rautomead Limited
The main objective of this paper was to assess three leaded
brass samples (pending application with Copper Development
Association) using optical microscopy and mass
spectrometry to compare the distribution of lead. Based on
the mass spectrometry data, a great deal of variation was
not found within each of the samples based on five different
sample locations. Optical microscopy, scanning electron
microscopy and energy-dispersive X-ray spectroscopy
confirmed that the lead was homogenously distributed in
brass.
Performance of Self Compacting High Strength Fiber Reinforced Concrete (SCHSFRC)IOSR Journals
In this experimental study the changes on some mechanical properties of self compacting concrete
specimen produced by silica fume, metakaolin, fly ash and steel fibers were investigated. The main objective of
this is to obtain ductile Self Compacting High Strength Concrete (SCHSC) which flows under its own weight
and homogeneity while completely filling any formwork and passing around congested reinforcement. The Self
Compacting High Strength Concrete produced by using silica fume, metakaolin, fly ash, steel fibers and
Polycarboxylatether base superplasticizer. Three types of steel fibers were used in the experiments and volume
fractions of steel fiber were 0.5% to 4.0 %. Addition of silica fume, metakaolin and fly ash into the concrete
were 2.5 %, 2.5 % and 10 % by weight of cement content respectively. Water/cement ratio was 0.29.
Compressive strength and split tensile strength tests were made on hardened concrete specimens.
System shear connector jakarta digunakan sebagai aplikasi dalam konstruksi bangunan untuk menghasilkan kekuatan coran beton lebih kuat dan stabil sesuai dengan perhitungan engineering civil. Dalam hal ini ada 2 hal perhitungan kekuatan secara umum yaitu kekuatan kelengketan stud pada batang baja sesudah dilas. Dan yang kedua adalah kekuatan stud bolt yang digunakan.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Effect of adding titanium oxide nanoparticles (TiO2) on structure, elastic moduli, Vickers hardness, internal friction, electrical
resistivity and thermal properties of tin-antimony-lead and tin-aluminum bearing alloys have been investigated. Elastic modulus, Vickers
hardness and thermal diffusivity of Sn87Sb10Pb3 and Sn80Al20 alloys increased after adding TiO2 nanoparticles. Internal friction, thermal
conductivity and specific heat of Sn87Sb10Pb3 and Sn80Al20 alloys varied after adding TiO2 nanoparticles. Adding titanium oxide nanoparticles
improved bearing properties, such as strengthens and internal friction of Sn87Sb10Pb3 and Sn80Al20 alloys. The Sn85.5Sb10Pb3(TiO2)1.5 alloy has
best properties for automotive industry. Also Sn78.5Al20(TiO2)1.5 alloy has best properties for marine applications.
To access the ballistic performance without executing real time test on targets / armour plates using sophisticated facility of experimental set up .
Thus the present investigation aims at developing suitable simulation for accessing the ballistic performance and comparing experimental findings with simulated results
Characteristics of Hypoeutectic Cu-Zr Alloy Rods Manufactured by Vertical Upw...Rautomead Limited
The focus in this study is therefore on applying a vertical upwards continuous casting (VUCC) mass-production
method to the pilot-scale manufacturing of Cu-Zr alloy rods. The microstructure and physical characteristics of these
VUCC rods were subsequently investigated and compared with rods produced by CMC. In addition, the wire-drawing
capability of the VUCC rods was examined, and the adaptability of the VUCC method to the mass production of
hypoeutectic Cu-Zr alloys was fully investigated.
2.
TRIBOLOGICAL CHARACTERISTICS OF ALUMINIUM HYBRID COMPOSITES REINFORCED WITH S...Blaza Stojanovic
This paper presents tribological characteristics of hybrid composites with aluminium
matrix, reinforced with silicon carbide (SiC) and graphite (Gr). Newly
formed Al/SiC/Gr hybrid composites are the combination of the two different hybrid
materials. Namely, hard particles of silicon carbide increase the hardness and
resistance to wear, while soft particles of graphite improve lubrication and reduce
friction coefficient and wear. It is possible to obtain Al/SiC/Gr hybrid composites
by different methods of casting. Tribological tests show that load, sliding speed,
sliding distance, content and size of reinforcement particles influence the size
and the type of wear and friction coefficient of Al/SiC/Gr hybrid composites with
aluminium matrix.
STRENGTHENING OF NORMAL AND HIGH STRENGTH CONCRETE CORBELS WITH HORIZONTAL AN...IAEME Publication
In this study, there were two modes of applying the carbon fiber strips on reinforced concrete corbels: the first one is application three horizontal strips and its width is (50 mm) and the other is applying three inclined strips with angle about (45°), the both modes applied on the two faces of concrete corbel specimens. Two types of concrete were used in this study; normal strength (28 MPa) and high strength concrete (57 MPa). Each types strengthening with two modes of carbon fiber stripes.
The ultimate and cracking capacity of tested specimens were improved as a result of strengthening with carbon fiber strips, in addition to development of energy absorption and stiffness characteristics.
A Review on Mechanical and Wear Properties of Heat Treated SteelIJSRD
This Review Paper describes effects of heat treatment on various material by varying process parameters and by using different types of heat treatment process. The heat treatment includes heating & cooling operations or the sequence of two or more such operations applied to any material in order to modify metallurgical structure and alter its physical, mechanical and chemical properties. This Review paper shows progress and research in the field of heat treatment process. Different types of heat treatment processes such as annealing, normalising, nitriding, hardening, tempering carburising used & available in recent time. This paper deals with important progress work on heat treatment and its process parameters.
In the material testing laboratory, a Charpy impact test was performed on three different types (hot,cold,and steel alloy)of steels testing each variety at four different temperatures (32°C(RT), 100°C,0°C and -22°C ). From results (shown below), we determined that the a transition is from ductile failures to brittle failures
Effects of thermo mechanical simulation on the corrosion of steelJaideep Adusumelli
Performed numerous stress-strain elasticity tests along with impact test under controlled temperature and stress factors.
then the corrosion properties were studied based on the microstructures and corrosion current graphs.
Improving Mechanical Properties of AL 7075 alloy by Equal Channel Angular Ext...IJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
The effect of Deep cryogenic treatment (DCT) on the metallurgical and mechani...Dr.M BALA THEJA
The effect of Deep cryogenic treatment (DCT) on the metallurgical and mechanical properties of Aluminium 6061-T6 is investigated in the present work
The test castings were solutionized at 525°C for 08 hrs and water quenched to room temperature. One set of samples were subjected to cryogenic treatment at -196°C in Cryo- treatment unit, while the other set is subjected to age hardening at 160°C for durations of 3 hrs, 5hrs and 7hrs. Again cryogenic treated specimens were subjected to age hardening at 165°C for durations of 3hrs, 5 hrs and 7hrs. All the samples were taken for Mechanical properties evaluation.
The total duration of the Cryogenic treatment cycle was 36 hrs, which includes 3hrs of cooling from room temperature to -196°C, 24hrs of holding and 09 hrs of warming to room temperature. The Cryogenic treatment was carried out in a specially designed Cryogenic unit
Effect of depth to thickness ratio and length to depth ratio on hollow sectio...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Mechanism of Fracture in Friction Stir Processed Aluminium AlloyDr. Amarjeet Singh
Aluminium alloys are used for important
applications in reducing the weight of the component and
structure particularly associated with transport, marine,
and aerospace fields. Grain refinement by scandium (Sc)
addition can eliminate the casting defects and increase the
resistance to hot tearing for high strength aluminium alloys.
FSP for cast aluminium alloys have been focused and it has
great advantages including solid state microstructural
evolution, altering mechanical properties by optimizing
process parameters. These parameters are tool rotational
speeds (720, and 1000 rpm), traverse speeds (80, and 70
mm/min), and axial compressive force at 15 kN, etc. The
mechanical properties had been evaluated on FSPed
aluminium alloy with different microstructural conditions.
Fracture properties of aluminium alloys are very important
for industrial applications. Tensile and fracture toughness
properties were correlated to microstructural and
fractographic features of the aluminium alloys need to
explore their essential failure mechanisms.
Knowledge and Experience of Menopause - A Rural Based Study in Aligarhjournal ijrtem
ABSTRACT: The menopause is a transitional phase in women’s life.The level of oestrogen is decreased ,because of which a variety of symptoms such as hot flushes, mucosal dryness, excessive sweating, emotional fluctuations, psychoses, decr-eased strength and calcification of bones occurs. Attitudes, perception and expectations are part of the psychosocial phenomenon surrounding menopause. Natural menopause is diagnosed after 12 months of amenorrhoea not associated with a pathological cause. Menopause is a gradual process that lasts for about 2 years, called climacteric. It is normal and should not be taken as a disease or syndrome. The aim of this study was to find out the knowledge and experience of menopausal symptoms among women who had attained menopause
Torsional Fatigue Performance of Induction Hardened 1045 and 10V45 SteelsFluxtrol Inc.
Microalloying of medium carbon bar steels is a common
practice for a number of traditional components; however, use
of vanadium microalloyed steels is expanding into
applications beyond their original designed use as controlled
cooled forged and hot rolled products and into heat treated
components. As a result, there is uncertainty regarding the
influence of vanadium on the properties of heat treated
components, specifically the effect of rapid heat treating such
as induction hardening. In the current study, the torsional
fatigue behavior of hot rolled and scan induction hardened
1045 and 10V45 bars are examined and evaluated at effective
case depths of 25, 32, and 44% of the radius. Torsional fatigue
tests were conducted at a stress ratio of 0.1 and shear stress
amplitudes of 550, 600, and 650 MPa. Cycles to failure are
compared to an empirical model, which accounts for case
depth as well as carbon content.
Григорий Йом Дин, Александр Слуцкий, Йехиель Штайнмец
Golan Research Institute, University of Haifa, Katzrin, Israel
Extension Service, Department of Floriculture, Ministry of Agriculture, Israel
Различия в эффективности ферм в
отрасли цветов Safari Sunset
Клоков В.В., профессор, Сергеев Д.Е., Казанский государственный университет, Казань
Стационарная электрохимическая обработка системой катодов-инструментов
Новаков И.А., Рахимова Н.А., Краснов А.П., Афоничева О.В., Баженова В.Б.
Волгоградский государственный технический университет, Волгоград
Институт элементоорганических соединений им. Н.А.Несмеянова РАН, Москва
Исследование трибохимических свойств материалов из ПКА, модифицированных микродопированием полифторированных соединений
Овсянников А.А., Российский Государственный Гидрометеорологический Университет, Санкт-Петербург
К вопросу об управлении айсберговыми рисками при освоении Штокмановского газоконденсатного месторождения
Мальцева А.А., Федеральное агентство по образованию Курский государственный технический университет, Курск
Создание университета исследовательского типа как фактор эффективного социально-экономического развития региона
Гринберг Я.Р., Курочкин И.И., Институт системного анализа РАН, Москва
Математическое моделирование последовательного заполнения телекоммуникационных сетей с кластерной топологией
Маричев В.Н., гл. н. с., Кудинов А.П., зам. директора, Институт оптики атмосферы СО РАН, Томск
Лидарные исследования вертикальногораспределения аэрозоля, озона и температуры в стратосфере над Томском
Кудинов А.П., Кузьменков Д.О., Маричев В.Н., Институт оптики атмосферы СО РАН, Томск
Программный комплекс для обработки данных лидарного зондирования аэрозоля и температуры в нижней и средней атмосфере
Изобелло А.Ю., Волочко А.Т., Физико-технический институт НАНБ, Минск, Беларусь
Исследование влияния конструкции охлаждающей камеры на температурное состояние поршня двигателя внутреннего сгорания
Горбунов Н.А., Государственная морская академия им. С.О. Макарова, г. Санкт-Петербург
Разработка плазменных технологий для прямого фотоэлектрического преобразования с сфокусированного солнечного излучения
Воробьёв В.И., д.т.н., Шишкин В.М., к.т.н., Санкт-Петербургский институт
информатики и автоматизации РАН, Лаборатория информационно-вычислительных систем и проблем защиты информации, Санкт-Петербург
Оценка рисков при прогнозе погоды
Ившина И.Б., Вихарева Е.В., Рычкова М.И., Наймарк О.Б., Плехов О.А., Нечеухина Т.А.
Институт экологии и генетики микроорганизмов УрО РАН, ПермьПермская государственная фармацевтическая академия
Институт механики сплошных сред УрО РАН, Пермь
Пермский государственный университет
Экологически безопасный способ биоконверсии лекарственных средств, непригодных к медицинскому использованию
Белов Г.П., Институт проблем химической физики РАН, г. Черноголовка
Состояние научных исследований и промышленных разработок в области получения альфа-олефинов(бутена-1, гексена-1, октена-1)
Андриенко И.Н., Институт проблем технологии микроэлектроники и особочистых материалов
РАН (ИПТМ РАН), г.Черноголовка
Некоторые аспекты разработки библиографической комплексной базы данных технологии микро- и наноэлектроники с переменным форматом данных
Деспотули А.Л., Андреева А.В., Институт проблем технологии микроэлектроники и особочистых материалов,
г.Черноголовка, Московская обл.
Проект создания субвольтовых интегральных схем с наноионными суперконденсаторами
Куренкова В.В., Малашенко И. С., Трохимченко В. В., Институт электросварки им. Е. О. Патона НАН Украины, г. Киев
Высокотемпературная пайка никелевого сплава ЖС26 композиционным бор-, кремний содержащим припоем с наполнителем
Нырков А.П., д.т.н., профессор, заведующий кафедрой СПбГУВК, Санкт-Петербург
Современные информационные технологии в обеспечении безопасности судоходства
Key Trends Shaping the Future of Infrastructure.pdfCheryl Hung
Keynote at DIGIT West Expo, Glasgow on 29 May 2024.
Cheryl Hung, ochery.com
Sr Director, Infrastructure Ecosystem, Arm.
The key trends across hardware, cloud and open-source; exploring how these areas are likely to mature and develop over the short and long-term, and then considering how organisations can position themselves to adapt and thrive.
Neuro-symbolic is not enough, we need neuro-*semantic*Frank van Harmelen
Neuro-symbolic (NeSy) AI is on the rise. However, simply machine learning on just any symbolic structure is not sufficient to really harvest the gains of NeSy. These will only be gained when the symbolic structures have an actual semantics. I give an operational definition of semantics as “predictable inference”.
All of this illustrated with link prediction over knowledge graphs, but the argument is general.
"Impact of front-end architecture on development cost", Viktor TurskyiFwdays
I have heard many times that architecture is not important for the front-end. Also, many times I have seen how developers implement features on the front-end just following the standard rules for a framework and think that this is enough to successfully launch the project, and then the project fails. How to prevent this and what approach to choose? I have launched dozens of complex projects and during the talk we will analyze which approaches have worked for me and which have not.
JMeter webinar - integration with InfluxDB and GrafanaRTTS
Watch this recorded webinar about real-time monitoring of application performance. See how to integrate Apache JMeter, the open-source leader in performance testing, with InfluxDB, the open-source time-series database, and Grafana, the open-source analytics and visualization application.
In this webinar, we will review the benefits of leveraging InfluxDB and Grafana when executing load tests and demonstrate how these tools are used to visualize performance metrics.
Length: 30 minutes
Session Overview
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During this webinar, we will cover the following topics while demonstrating the integrations of JMeter, InfluxDB and Grafana:
- What out-of-the-box solutions are available for real-time monitoring JMeter tests?
- What are the benefits of integrating InfluxDB and Grafana into the load testing stack?
- Which features are provided by Grafana?
- Demonstration of InfluxDB and Grafana using a practice web application
To view the webinar recording, go to:
https://www.rttsweb.com/jmeter-integration-webinar
Software Delivery At the Speed of AI: Inflectra Invests In AI-Powered QualityInflectra
In this insightful webinar, Inflectra explores how artificial intelligence (AI) is transforming software development and testing. Discover how AI-powered tools are revolutionizing every stage of the software development lifecycle (SDLC), from design and prototyping to testing, deployment, and monitoring.
Learn about:
• The Future of Testing: How AI is shifting testing towards verification, analysis, and higher-level skills, while reducing repetitive tasks.
• Test Automation: How AI-powered test case generation, optimization, and self-healing tests are making testing more efficient and effective.
• Visual Testing: Explore the emerging capabilities of AI in visual testing and how it's set to revolutionize UI verification.
• Inflectra's AI Solutions: See demonstrations of Inflectra's cutting-edge AI tools like the ChatGPT plugin and Azure Open AI platform, designed to streamline your testing process.
Whether you're a developer, tester, or QA professional, this webinar will give you valuable insights into how AI is shaping the future of software delivery.
Builder.ai Founder Sachin Dev Duggal's Strategic Approach to Create an Innova...Ramesh Iyer
In today's fast-changing business world, Companies that adapt and embrace new ideas often need help to keep up with the competition. However, fostering a culture of innovation takes much work. It takes vision, leadership and willingness to take risks in the right proportion. Sachin Dev Duggal, co-founder of Builder.ai, has perfected the art of this balance, creating a company culture where creativity and growth are nurtured at each stage.
UiPath Test Automation using UiPath Test Suite series, part 4DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 4. In this session, we will cover Test Manager overview along with SAP heatmap.
The UiPath Test Manager overview with SAP heatmap webinar offers a concise yet comprehensive exploration of the role of a Test Manager within SAP environments, coupled with the utilization of heatmaps for effective testing strategies.
Participants will gain insights into the responsibilities, challenges, and best practices associated with test management in SAP projects. Additionally, the webinar delves into the significance of heatmaps as a visual aid for identifying testing priorities, areas of risk, and resource allocation within SAP landscapes. Through this session, attendees can expect to enhance their understanding of test management principles while learning practical approaches to optimize testing processes in SAP environments using heatmap visualization techniques
What will you get from this session?
1. Insights into SAP testing best practices
2. Heatmap utilization for testing
3. Optimization of testing processes
4. Demo
Topics covered:
Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using Deplo...James Anderson
Effective Application Security in Software Delivery lifecycle using Deployment Firewall and DBOM
The modern software delivery process (or the CI/CD process) includes many tools, distributed teams, open-source code, and cloud platforms. Constant focus on speed to release software to market, along with the traditional slow and manual security checks has caused gaps in continuous security as an important piece in the software supply chain. Today organizations feel more susceptible to external and internal cyber threats due to the vast attack surface in their applications supply chain and the lack of end-to-end governance and risk management.
The software team must secure its software delivery process to avoid vulnerability and security breaches. This needs to be achieved with existing tool chains and without extensive rework of the delivery processes. This talk will present strategies and techniques for providing visibility into the true risk of the existing vulnerabilities, preventing the introduction of security issues in the software, resolving vulnerabilities in production environments quickly, and capturing the deployment bill of materials (DBOM).
Speakers:
Bob Boule
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Gopinath Rebala
Gopinath Rebala is the CTO of OpsMx, where he has overall responsibility for the machine learning and data processing architectures for Secure Software Delivery. Gopi also has a strong connection with our customers, leading design and architecture for strategic implementations. Gopi is a frequent speaker and well-known leader in continuous delivery and integrating security into software delivery.
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Transcript: Selling digital books in 2024: Insights from industry leaders - T...BookNet Canada
The publishing industry has been selling digital audiobooks and ebooks for over a decade and has found its groove. What’s changed? What has stayed the same? Where do we go from here? Join a group of leading sales peers from across the industry for a conversation about the lessons learned since the popularization of digital books, best practices, digital book supply chain management, and more.
Link to video recording: https://bnctechforum.ca/sessions/selling-digital-books-in-2024-insights-from-industry-leaders/
Presented by BookNet Canada on May 28, 2024, with support from the Department of Canadian Heritage.
The Art of the Pitch: WordPress Relationships and SalesLaura Byrne
Clients don’t know what they don’t know. What web solutions are right for them? How does WordPress come into the picture? How do you make sure you understand scope and timeline? What do you do if sometime changes?
All these questions and more will be explored as we talk about matching clients’ needs with what your agency offers without pulling teeth or pulling your hair out. Practical tips, and strategies for successful relationship building that leads to closing the deal.
1. EFFECT OF AGING TREATMENT ON THE BALLISTIC BEHAVIOR OF ALUMINUM ALLOY 7075 AGAINST 7.62 mm ARMOR PIERCING PROJECTILES Teyfik DEMİR 1 , Mustafa ÜBEYLİ 1 and R. Orhan YILDIRIM 2 1 TOBB ETU Mechanical Engineering, Söğütözü Cad. No:43, Ankara-TURKEY E-mail: [email_address] 2 Middle East Technical University, Mechanical Eng., Ankara-TURKEY
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5. After steel, high strength aluminum alloys have also some potential to be used as armor due to relatively higher specific strength. Another potential candidate material is titanium alloys but their relatively high cost restricts their use significantly.
6. This study presents the ballistic behavior of aluminum alloys of 7075 and 5083 and HSLA steel, AISI 4140 against 7.62 mm armor piercing projectile. In addition to the variety of the alloys, effect of mechanical properties and areal density on the ballistic behavior of these alloys was investigated.
7. EXPERIMENTAL PROCEDURE Five different areal densities, namely 55, 70, 85, 100 and 115 kg/m 2 were selected to be used for each alloy to see the change in the ballistic resistance with thickness of the material and compare these materials.
8. Nomenclature for the specimens was used as shown below: Areal Density: 1) 55, 2) 70, 3) 85, 4) 100, 5) 115 kg/m 2 Heat Treatment: A) 38 HRC (for the AISI 4140) H111 (for the AA5083) TO: annealed (for the AA7075) B) 50 HRC (for the AISI 4140) and T651 (for the AA7075) C) 53 HRC (for the AISI 4140) and T7351 (for the AA7075) D) 60 HRC (for the AISI 4140) Material type: 1) AISI 4140, 2) AA5083, 3) AA7075 1A2
9. After that, various heat treatments were applied to the alloys, AISI 4140 and 7075 to get different mechanical properties. Table 1 gives the heat treatment procedure for these materials. On the other hand, the alloy 5083 was used as in received condition (H111).
10. A heat treatable aluminum alloy 7075 was received in two different heat treatment conditions, T651 (aged) and T7351 (overaged). Furthermore, a third heat treatment condition, namely annealing at 420 C was also applied to the 7075 to see the effect of mechanical properties on the ballistic behavior of this alloy more clearly
11. Table 1. Heat treatment procedures applied for the AISI 4140 and 7075 180 420 60 7075 Annealing Time (minute) Annealing Temperature ( C) Hardness (HB) 250 60 400 53 450 50 120 580 90 860 38 AISI 4140 Tempering Time (minute) Tempering Temp . ( C) Austenitizing Time (minute) Austenitizing Temperature ( C) Hardness Level (HRC) Material
12. Table 2 gives the thicknesses of the investigated materials corresponding to the areal densities mentioned above. After finishing the heat treatment processes, the standard mechanical tests, tension and hardness, were applied to determine important mechanical properties .
13. Table 2. Thicknesses of the materials corresponding to areal densities 3C 3B 3A 40 35 30 25 20 Thickness (mm) 2A 1D 1C 1B 14.4 12.7 10.8 9 7.2 Thickness (mm) 1A 115 100 85 70 55 Areal Density (kg/m 2 ) Specimen Group
14. Next, b allistic experiments were performed with A P projectiles of 7.62 x 51 mm in a ballistic laboratory. Five separate specimens for every specimen group were tested as each specimen group had five different areal densities. Targets were subjected to a single shot for every specimen and all tests were repeated five times.
15. The impact velocity of projectile was recorded to be 7 9 0 4 . 5 m/s in the experiments. Finally, macro observations were made on the samples to clarify their failure modes.
16. Fig. 1. A schematic view of the experimental setup
17. RESULTS AND DISCUSSION Any ballistic threat has to be stopped without perforation at the backing layer of the composite for safety. Therefore, t he samples, of which backing plates resisted to the projectile without perforation, were accepted as satisfactory.
18. Table 3 gives some important mechanical properites of the investigated alloys. There is a significant change in the strength and hardness level with respect to heat treatment conditions.
19. Table 3 . Some important mechanical properties of the investigated materials 13.0 505 435 1.2 150 3C 11.0 570 500 1.3 170 3B 17.0 230 105 1.5 60 3A 16.0 300 190 1.4 85 2A Ductility (% Elongation) Tensile Strength (MPa) Yield Strength (MPa) Standard Dev . in Hardness Hardness (HB) 8 .0 1800 1500 1.3 60 1D 12.7 1640 1400 1.1 53.4 1C 13.8 1570 1250 0.9 49.9 1B 17.0 1450 1150 0.9 37.8 1A Ductility (% Elongation) Tensile Strength (MPa) Yield Strength (MPa) Standard Dev . in Hardness Hardness (HRC) Specimen Group
20. Ballistic performance of the investigated alloys was evaluated by considering the probability of non- perforation of these alloys out of 5 shots which is given in Table 4 . The specimen groups; 2A and 3A, were fully perforated at all areal densities since they did not resist the impact of the projectiles efficiently due to their lowest hardness and strength among the investigated specimen groups.
21. Table 4 . Probability of the non-perforation of the specimen groups a Specimen was not penetrated but broken into several pieces. b Specimen was successful but rear surface had some cracks. 100 b 100 b 0 0 0 3C 100 100 100 0 0 3B 0 0 0 0 0 3A 0 0 0 0 0 2A 80 a 0 a 0 a 0 a 0 a 1D 100 100 0 a 0 a 0 1C 0 a 0 a 0 0 0 1B 0 0 0 0 0 Performance (%) 1A 115 100 85 70 55 Areal Density (kg/m 2 ) Specimen Group
22. Figure 2. Macro views of the front (at top of the Figure) and rear (at bottom of the Figure) of the 3A having the areal density of a) 55 kg/m 2 , b) 70 kg/m 2 , c) 85 kg/m 2 , d) 100 kg/m 2 and e) 115 kg/m 2 after the ballistic impact.
23. Figure 3 . Macro cross-sectional view of the specimen 3A5 through the hole created by the projectile after the ballistic testing. Steel core of the projectile perforated the sample easily by leaving its brass jacket at nearly 10 mm away from the impact point. Brass jacket of the projectile
24. On the other hand, the specimen group 3B was satisfactory at an areal density 85 kg/m 2 , whereas 3C samples provided the full ballistic protection for an areal density 100 kg/m 2 . Figure 4 represents the cross sectional view of the specimens 3B3, 3B4 and 3B5 through the centerline of the impact point after the ballistic testing.
25. Figure 4. Macro view of the cross-section of the specimens a) 3B3, b) 3B4 and c) 3B5 through the centerline of the impact point after the ballistic test. It can be seen that the penetration depth of the projectile was almost the same for the 3B samples having different thicknesses. (Scale was given in mm).
26. For the steel AISI 4140, the samples having a hardness of ~ 38 HRC were perforated by the projectiles via forming a ductile hole as seen in the failed aluminum alloy specimens (Figures 5 and 6 ). When its hardness was increased to ~ 50 HRC, the brittle fracture was observed for the specimens at all investigated areal densities (Figure 7 ).
27. Figure 5. Photographs of the specimen group 1A with a) 55 kg/m2, b) 70 kg/m 2 , c) 85 kg/m 2 , d) 100 kg/m 2 and e) 115 kg/m 2 after the ballistic impact. All samples failed under the impact of AP projectiles. a) b) c) d) e)
28. Figure 6. Ductile hole formation in the specimen of 1A5. The projectile inlet and outlet regions were shown as in the circles of A and B, respectively. Petalling was observed only at the rear side of the specimen.
29. Figure 7. Photographs of the 1B specimens having an areal density of a) 55 kg/m 2 , b) 70 kg/m 2 , c) 85 kg/m 2 , d) 100 kg/m 2 and e) 115 kg/m 2 after the ballistic impact. All samples fractured into several pieces in a brittle manner. Radial fractures on the samples occurred. a) b) c) d) e)
30. Among the steel specimen groups, the best performance was found for the 1C having a hardness of ~ 53 HRC. As shown in Figure 8 , the samples 1C4 and 1C5 withstood the impact of the AP projectile successfully and maintained the full ballistic performance. Moreover, there were no cracks observed on these specimens. When the hardness was increased to 60 HRC, the specimens were fractured into several pieces depending on the areal density (Figure 9 ).
31. Figure 8. Front views of the 1C specimens with a) 55 kg/m 2 , b) 70 kg/m 2 , c) 85 kg/m 2 , d) 100 kg/m 2 and e) 115 kg/m 2 after the impact of the projectile. The samples 1C4 and 1C5 achieved to stop the AP projectiles whereas the others failed. a) b) c) d) e)
32. Figure 9. View of the specimen 1D failed by fracturing into several pieces under the impact of the AP projectiles. The number of fractured pieces decreased when its areal density was increased from a) 55 kg/m 2 , b) 70 kg/m 2 , c) 85 kg/m 2 , d) 100 kg/m 2 and e) 115 kg/m 2 .