Abstract: Thermodynamic modellings of the Au–Rb system was carried out by means of the CALPHAD (calculation of phase diagrams) method. The liquid phase and the intermetallic compounds Au5Rb, Au2Rb, AuRb and Au7Rb3 and Au3Rb2 (new compounds) in addition to the compound AuRb2 (suspected compound) are taken into consideration in this optimization. The substitutional solution model was used to describe the liquid phase. The six compounds are treated as stoichiometric phases. The enthalpies of formation used in these optimizations were calculated within ab-initio method in precedent work
Phase diagrams for Different Alloy
By
P.SENTHAMARAIKANNAN,
ASSISTANT PROFESSOR ,
DEPARTMENT OF MECHANICAL ENGINEERING,
KAMARAJ COLLEGE OF ENGINEERING AND TECHNOLOGY,
VIRUDHUNAGAR, TAMILNADU,
INDIA
Phase diagrams for Different Alloy
By
P.SENTHAMARAIKANNAN,
ASSISTANT PROFESSOR ,
DEPARTMENT OF MECHANICAL ENGINEERING,
KAMARAJ COLLEGE OF ENGINEERING AND TECHNOLOGY,
VIRUDHUNAGAR, TAMILNADU,
INDIA
THE PHASE RULE
phase rule
degree of freedom in mixture
one component system
two component system
pressure temperature diagram sulfur hydrogen
eutectic eutectoid mixture
Phase equilibria: phase, components and degrees of freedom. The phase rule and its
thermodynamic derivation. The phase diagrams of water and sulphur systems, partially
miscible liquid pairs: the phenol and water and nicotine-water systems. Completely
miscible liquid pairs and their separation by fractional distillation. Freeze drying
(lyophilization).
its the ppt about phase rule which is the part of physical and inorganic chemistry in GTU. it explains how the phase rule is applicable in chemical eng.
Infomatica, as it stands today, is a manifestation of our values, toil, and dedication towards imparting knowledge to the pupils of the society. Visit us: http://www.infomaticaacademy.com/
Presentation suitable mainly for Engineering Students
Highlights: Phase Rule Derivation, Cooling curves, Phase Diagram of water, Carbon dioxide, lead-Silver system, zinc-magnesium system and sodium sulphate-water system
Linking Ab Initio-Calphad for the Assessment of the AluminiumLutetium SystemIRJESJOURNAL
Abstract: First-principles calculations within density functional theory (DFT) were used to investigate intermetallics in the Al-Lu system at 0 K. The five compounds of the system were investigated in their observed experimental structures. Thermodynamic modelling of the Au–Lu system was carried out by means of the CALPHAD (calculation of phase diagrams) method. The liquid phase and the intermetallic compounds Al3Lu, Al2Lu, AlLu, Al2Lu3 and AlLu2 are taken into consideration in this optimization. The substitutional solution model was used to describe the liquid phase. The five compounds are treated as stoichiometric phases. The enthalpies of formation of the compounds were found by the ab initio calculations and used in the optimization of the phase diagram.
THE PHASE RULE
phase rule
degree of freedom in mixture
one component system
two component system
pressure temperature diagram sulfur hydrogen
eutectic eutectoid mixture
Phase equilibria: phase, components and degrees of freedom. The phase rule and its
thermodynamic derivation. The phase diagrams of water and sulphur systems, partially
miscible liquid pairs: the phenol and water and nicotine-water systems. Completely
miscible liquid pairs and their separation by fractional distillation. Freeze drying
(lyophilization).
its the ppt about phase rule which is the part of physical and inorganic chemistry in GTU. it explains how the phase rule is applicable in chemical eng.
Infomatica, as it stands today, is a manifestation of our values, toil, and dedication towards imparting knowledge to the pupils of the society. Visit us: http://www.infomaticaacademy.com/
Presentation suitable mainly for Engineering Students
Highlights: Phase Rule Derivation, Cooling curves, Phase Diagram of water, Carbon dioxide, lead-Silver system, zinc-magnesium system and sodium sulphate-water system
Linking Ab Initio-Calphad for the Assessment of the AluminiumLutetium SystemIRJESJOURNAL
Abstract: First-principles calculations within density functional theory (DFT) were used to investigate intermetallics in the Al-Lu system at 0 K. The five compounds of the system were investigated in their observed experimental structures. Thermodynamic modelling of the Au–Lu system was carried out by means of the CALPHAD (calculation of phase diagrams) method. The liquid phase and the intermetallic compounds Al3Lu, Al2Lu, AlLu, Al2Lu3 and AlLu2 are taken into consideration in this optimization. The substitutional solution model was used to describe the liquid phase. The five compounds are treated as stoichiometric phases. The enthalpies of formation of the compounds were found by the ab initio calculations and used in the optimization of the phase diagram.
Preparation characterization and conductivity studies of Nasicon systems Ag3-...iosrjce
Materials belonging to NASICON family of compositions Ag3-2xTaxIn2-x(PO4)3 ( x = 0.6,0.8 and 1.1)
are prepared by sol-gel method. Ethylene glycol is used as a gelating agent. All the compositions are
characterizedby powder X-ray diffraction and Fourier transform infrared spectroscopy All these
phosphates are crystallized in rhombohedral lattice with space group R3c
. These compounds exhibit
characteristic PO4 vibrational modes in their FT-IR spectra. The dc conductivity of Ag3-2xTaxIn2-x(PO4)3 ( x =
0.6,0.8 and 1.1) was also investigated.
Biomass is considered as a potential source of energy production.Gasification can be employed to convert
dilute biomass energy source in to gaseous products holding concentrated form of energy. A steady state model for fluidized
bed biomass gasifier is developed based on reaction kinetics and hydrodynamic aspects of fluidization. The presence of
sorbent for absorption of carbon dioxide from the product gas is also incorporated in the model.The developed model
predicts the variation of syngas composition, temperature, pressure and velocity along the height of gasifier. Experiments
were carried out in a lab scale fluidized bed biomass gasifier and the results were used to validate the model.An increase of
50.35% in H2 mole fraction and a decrease of 50.88 % in CO2 mole fraction were observed when CaO was used as the
sorbent.
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.
The IOSR Journal of Pharmacy (IOSRPHR) is an open access online & offline peer reviewed international journal, which publishes innovative research papers, reviews, mini-reviews, short communications and notes dealing with Pharmaceutical Sciences( Pharmaceutical Technology, Pharmaceutics, Biopharmaceutics, Pharmacokinetics, Pharmaceutical/Medicinal Chemistry, Computational Chemistry and Molecular Drug Design, Pharmacognosy & Phytochemistry, Pharmacology, Pharmaceutical Analysis, Pharmacy Practice, Clinical and Hospital Pharmacy, Cell Biology, Genomics and Proteomics, Pharmacogenomics, Bioinformatics and Biotechnology of Pharmaceutical Interest........more details on Aim & Scope).
All manuscripts are subject to rapid peer review. Those of high quality (not previously published and not under consideration for publication in another journal) will be published without delay.
This Journal publishes original research work that contributes significantly to further the scientific knowledge in pharmacy.
Drying of agricultural products using forced convection indirect solar dryerIRJESJOURNAL
Abstract:- Drying of three agricultural products namely potato slices, onion slices and whole grapes was done using an indigenously designed and fabricated forced convection indirect solar dryer and under open sunlight. The diurnal variation of temperature, relative humidity in the solar dryer was also compared with the ambient temperature and relative humidity during March and April 2017 for all the three products. The study showed increase of temperature and lower humidity inside the drying chamber at different time interval. Hourly moisture loss for all the three agricultural products in the drying chamber and open sun drying was also compared and the percentage of moisture loss in the drying chamber was found to be higher compared to open sun drying for all the products. The mass of water removed for all the three products in the drying chamber was also found to be higher than the open sun drying. Results of the study showed that forced convection indirect solar dryer is better than the open sun drying method for drying the agricultural products more efficiently.
The Problems of Constructing Optimal Onboard Colored RGB Depicting UAV SystemsIRJESJOURNAL
Abstract:-The problems of constructing optimal adaptive onboard color RGB depictingUAV systems have been analyzed. The problem of optimal formation of color signals of RGB color system has been formulated and solved by implementing the adaptive flight mode of UAVs containing an onboard imaging system. An adaptive UAV mode with an imaging system on board is proposed, which consists of adaptive changes in flight altitude depending on the wavelength of the received color signal. As a result of the optimization of the proposed operating mode of the UAV imaging system, an analytic formula for adaptive device control has been obtained. Recommendations have been given on the practical implementation of the proposed method.
Flexible Design Processes to Reduce the Early Obsolescence of BuildingsIRJESJOURNAL
Abstract:- This work intends to analyze the processes of flexibility to improve the adaptability to the users and to define some strategies to delay building obsolescence. Some approaches that address the architectural flexibility processes are studied to understand the rapid transformation of user lifestyles and changes in needs and performance building requirements. Obsolescence is often characterized by the lack of flexibility in the structure and walls, as well as services that change rapidly according to the different uses of buildings. This poses a threat to the built environment, since a large number of buildings are demolished having still years of useful life. In this way, different types of obsolescence are analyzed, focusing on some structural, economic, functional and social aspects of the construction and the use of buildings, seeking the capacity to design and produce adaptive buildings that are more resilient to obsolescence. Thus, some concepts of flexibility and flexible process are presented to promote adaptability in buildings. However, flexibility is a complex process, a long way to achieve adaptability to the built environment and the changing needs of users. The method used in this analysis takes into account the diversity of the design process, making some considerations about the interrelation of the social, functional and technical aspects. Finally, some conclusions about the design methods faced by a flexible approach process can lead to more useful and adaptable spaces for future transformations in order to extend the life cycle and prevent early obsolescence of buildings.
Study on Performance Enhancement of Solar Ejector Cooling SystemIRJESJOURNAL
Abstract: Cooling sector is dominating by vapor compression cooling sector which uses refrigerant which are harmful to environment. The solar ejector cooling system is alternative for vapor compression cycle which uses solar energy to give heat to the generator, which is a viable method for heat generation. The solar ejector cooling system not only fulfills cooling requirement but also helps in energy conservation and protection of environment. It reduces the generator work and decrease the throttling losses. Maintenance requirement and cost is low for ejector cooling system .In this paper, theoretically study is done on enhancement of the performance of solar ejector cooling system. Various system configuration are presented with detailed design. This system still needed a lot of research work to make it alternative for vapor compression cycle based cooling system completely.
Flight Safety Case Study: Adi Sucipto Airport Jogjakarta - IndonesiaIRJESJOURNAL
Abstract: Adi Sucipto Airport-Jogyakarta is an airport with enclave civil status or as TNI-AU airbase (civilian airport within the military area) has limited infrastructure with Azimuth Runway 09-27, has no RESA (Runway End Safety Area). The calculation results using Acceptable Safety Level (ASL) standard 1 x 10-7 shows that the probability of accident risk at wet runway condition is greater than in dry condition. Runway Excursion occurs at the airport, especially when the runway is wet and overrun due to hydroplaning and the plane deviates from the center of runway as well as the aircraft wheels are in contact with ground or obstacle surface outside the runway. It means the thicker layer of water above the runway will cause increased risk of accidents on the runway. This is why standing water should be immediately removed from the runway as quickly as possible. Mitigation efforts need to be done simultaneously with recovery by adding RESA and other preventive efforts in order to water patch and standing water does not exceed 2 mm and apply the mandatory of SOP consistently at the airport.
A Review of Severe Plastic DeformationIRJESJOURNAL
ABSTRACT: This article reviews about Ultrafine grained (UFG) materials processed by Severe Plastic
Deformation. From the period of 1950’s, the researchers made a fountain stone for this technique. Over the last
decades, this SPD technique experienced an enormous growth among the research field. There was a
development of different methods of SPD, production of various materials by SPD with improved and
interesting results based on our requirement. Moreover, different post processing techniques will also help to
enhance the property of the SPD processed material. This paper reviews the overall development of this
technique, various methods of SPD, discussed about the enhancement of the properties and finally concluded
with some specific challenges and issues faced by the modern researchers. It may be helpful to those who wants
specialise in bulk nanomaterials produced by SPD.
Annealing Response of Aluminum Alloy AA6014 Processed By Severe Plastic Defor...IRJESJOURNAL
Abstract: In this paper the study of micro structural stability during annealing with respect to time of conventionally grains (CG) and ultrafine-grained (UFG) of Aluminum AA6014 i s carried out. It has been observed that, the effect of the second phase magnesium-silicon particles in the CG and UFG AA6014 samples leads to a rapid hardness which increases from 40HV10 to 70HV10 within 7 days. Artificial aging shows that the material hardness even increased after 20 hours of annealing at 180°C. In total 30 hours of annealing, the hardness arrives at its maximum and then reduces due to the formation of Mg2Si precipitates, which rise in size and change their coherency. The precipitates cannot efficiently pin the dislocations and act as barriers to the dislocation motion which indicate an overall decrease in the hardness. It also has been found that the ultrafinegrained AA6014 alloy loses its thermal stability at approximately 200°C and recrystallized at 300°C. Thermal stability is strongly dependent on the material purity, second phase particles and/or oxide particles which may break up during rolling and lead to some dispersion strengthening.
Evaluation of Thresholding Based Noncontact Respiration Rate Monitoring using...IRJESJOURNAL
Abstract: - A noncontact method for respiration rate monitoring using thermal imaging was developed and evaluated. Algorithms to capture images, detect the location of the face, locate the corners of the eyes from the detected face and thereafter locate the tip of the nose in each image were developed. The amount of emitted infrared radiation was then determined from the detected tip of the nose. Signal processing techniques were then utilised to obtain the respiration rate in real-time. The method was evaluated on 6 enrolled subjects after obtaining all ethical approvals. The evaluations were conducted against two existing contact based methods; thoracic and abdominal bands. Results showed a correlation coefficient of 0.9974 to 0.9999 depending on the location of the ROI relative to the detected tip of the nose. The main contributions of the work was the successful development and evaluation of the facial features tracking algorithms in thermal imagining, the evaluation of thermal imaging as a technology for respiration monitoring in a hospital environment against existing respiration monitoring systems as well as the real time nature of the method where the frame processing time was 40 ms from capture to respiration feature plotting.
Correlation of True Boiling Point of Crude OilIRJESJOURNAL
Abstract :- The knowledge of the crude boiling point is very important for the refining process design and optimization. In this project the aim is to find the correlation of true boiling points. The study will be very useful in crude transportation and downstream operations. Correlation is tried to obtain by testing a number of crude oil samples from heavy to light. The comparisons of boiling point of different crude samples obtained is tried to compare with already existing correlations. Framol, Destmol and Riazi’s, these three correlation models have taken. The result showed that comparison of three correlation models and which is more accurate.
Combined Geophysical And Geotechnical Techniques For Assessment Of Foundation...IRJESJOURNAL
Abstract: This study was carried out to assess the subsurface conditions around the school of technology complex in Lagos State Polytechnic, Ikorodu, using integrated geophysical and geotechnical techniques. The site lies within the Sedimentary terrain of southwestern Nigeria. Allied Ohmega Resistivity meter was used for data collection of 1-D and 2-D resistivitymeasurement while WinResist software and Dipro software were used for the processing respectively.The results of the vertical electrical sounding indicate that the depth to basement values ranges between 27.6 and 39.5m. The 2D resistivitysurvey has provided valuable information on the lateral and vertical variation of the layer competent for erecting foundation of engineering structures. The CPT probed an average depth of 4.8m and has identified material of very high shear strength associated with dense sand materials. The correlation of the three techniques used revealed similar soil layering consisting of topsoilsandy clay, coarse sand and sand.A mechanically stable coarse sand material was discovered as weathered layer which indicates high load bearing capacity suitable for foundation in the area and can support massive structures.
Abstract:- research stands out because it is provided by the model of Al-Mobaideen (2009) critics to analyze for the governance of information and communications technology (ICT) at the National University of Chimborazo factors which raises the factors such as: strategies and policies, infrastructure and networks, financing and sustainability, and institutional culture that should be taken into account if desired govern the successful integration of ICT in the school. The study is exploratory, the almost total lack of previous studies on Governance of ICT integration at the University. It is concluded that there is a set of organizations with addresses IT markedly different roles in their duties with regard to its orientation to administrative, academic and research. The University has failed to define the strategic role of ICT in their academic, because there is no objective referred to IT academia in 2013-2016 pedi, but also because there is not a pedi-oriented IT the formation. The limited effectiveness of IT organizations in academic activities is provided by the low rate of use of educationalplatformsb_learning.
Gobernanzade las TIC en la Educacion SuperiorIRJESJOURNAL
Abstract:-Se destaca la investigación debido a que se da a conocer mediante el modelo de Al-Mobaideen (2009) los factores críticos a analizar para la gobernanza de las Tecnologías de la información y la Comunicación (TIC) en la Universidad Nacional de Chimborazo donde plantea los factores como:estrategias y políticas, infraestructura y redes, financiación y sostenibilidad, y cultura institucional, que se debe tomar en cuenta si se desea gobernar la integración exitosa de las TIC en la institución educativa. El estudio es exploratoria, por la poca presencia de estudios previos sobre Gobernanza de la integración de las TIC en la Universidad. Se concluye que existe un conjunto de organismos con direcciones de TI con roles notoriamente diferenciados en sus funciones con respecto a su orientación a procesos administrativos, académicos y de investigación. La Universidad no ha logrado definir el rol estratégico de las TIC en su desarrollo académico, porque no existe ningún objetivo referido a TI para el ámbito académico en el PEDI 2013-2016, sino porque además, no se cuenta con un PEDI de TI orientado a la formación. La poca eficacia de los organismos de TI en actividades académicas se da a conocer por la baja tasa de uso de plataformas educativas b_learning.
The Analysis and Perspective on Development of Chinese Automotive Heavy-duty ...IRJESJOURNAL
Abstract: In recent years, under the influence of both China's domestic market demand and emissions standard improvement, Chinese manufacturers put great effort on the research and design of automotive heavy-duty diesel engine. This paper analyzes the technical parameters of heavy duty diesel engine in 11 / 13L displacement section and introduces its performance. At the same time, combined with the development of foreign heavy-duty diesel engine, the future development direction of Chinese heavy-duty diesel engine is forecasted.
Research on The Bottom Software of Electronic Control System In Automobile El...IRJESJOURNAL
Abstract: With the development of science and technology, car replacement faster and faster. The development of the automotive industry has a contradiction, on the one hand, the speed of upgrading the car technology can not keep up with the speed of the performance requirements of the car, on the other hand, the country's automobile exhaust emission standards become more stringent. In addition, the depletion of oil resources led to the rise in gasoline prices, the traditional car is facing a crisis. Considering the situation of gas fuel resource structure and supply situation in China, it is feasible to promote gas fuel engine[1].However, the pollution caused by the car has become one of the major pollution sources in the urban environment and the atmospheric environment, and this trend continues to deteriorate[2].Therefore, alternative energy vehicles and hybrid cars is the main direction of development, and any improvement in the car will be car electronics and software replacement for the premise. On the one hand, natural gas as an alternative to gasoline, with its low prices, excellent combustion emissions, the relative sustainable development and other characteristics of more and more car manufacturers favor;On the other hand, the mainstream of the automotive electronic control unit ECU software development to AUTOSAR structure, low power consumption, functional safety for the development direction. Based on the actual development of natural gas engine control unit, the structure and function of ECU software are studied with reference to AUTOSAR software design standard. This paper studies the structure of the application of the software layer of the electronic control system and the main control strategy under the various conditions of the structure, and puts forward the underlying software resources needed by the application layer software. This paper analyzes the internal and peripheral resources of Infineon XC2785x microcontroller and designs hardware abstraction layer software and ECU abstraction layer software. The current characteristics of the jet valve driven by the natural gas multi-point injection engine were investigated. Automotive electronics technology has been widely used in modern vehicles which, and gradually become the development of new models, improve the performance of the key technical factors[3] .
Evaluation of Specialized Virtual Health Libraries in Scholar Education Evalu...IRJESJOURNAL
Abstract:- The aim is to evaluate the impact on academic training with specialized virtual health libraries (databases and catalogs) available in Institutions of Scholar Education, because there is uncertainty about the appropriate use of these libraries. The research was conducted on the databases available on 2 universities during the academic period August 2015 - February 2016. Using criteria and indicators for evaluating virtual libraries, model quality of university libraries based on fuzzy techniques, Bibliometric and criteria for virtual libraries in health. The study had the participation of 188 students from two universities or groups. The research reveals that for the first group and the second group almost always (60.45%) find the information, the (57.2%) have relevance to the topic, access (45.8%) once a month, and Elseiver and BiblioMedica are the most commonly used, however, mostly ie (78.55%) use traditional libraries versus (58.2%) which are virtual. Descriptive analysis was performed using the software SPSSv20. This experience allows us to confirm that the use of libraries contributes discreetly in academic education, therefore, it requires training plans, reference guides, strengthen the socialization of this resource, free access from anywhere.
Elisa Test for Determination of Grapevine Viral Infection in Rahovec, KosovoIRJESJOURNAL
Abstract: Vineyard in Kosovo is estimated to have a great economic potential. There are thousands of hectares of vineyards that contribute to the economic potential of Rahovec by expanding the cultivation area year by year. The vines are affected by a number of viral diseases or pathologies similar to them, which significantly have an impact against the plant life and their production. Therefore, this study was conducted in several farms in Rahovec to determine whether there is a presence of viral infection in the vines. Application of Das-Elisa, Protein A-DAS and Antigen Direct Binding - DASI verified the final identification of viral infection in the collected material. The yellow colour reaction shown on the plate showed the positive result of the Elisa assay for viruses GFLV, ArMV, GLRaV-1, GLRaV-2, GLRaV-3, GVA and GVB in varieties Vranac, Smederevka, Prokup, Afuzali, Grocaka, Demir Kapi, Plovdina, Melika, Zhillavka. The use of specific antibodies will enable the examination of viral diseases in plant materials collected from vineyards and will be oriented to their phytosanitary status.
Abstract. Ensuring of permanent and continuous working process of oil-gas and field equipment alongside with the other factors, depends also on reliability of sealing units. A problem of deterioration modeling of a sealing element of a packer including into an oil field equipment complex is considered in this paper.
Determining Loss of Liquid from Different Types of Mud by Various Addictives ...IRJESJOURNAL
Abstract :- Filtration is used in many industries to separate water from the solid. It is important to find fluid loss in drilling, cementing, fracturing, and almost every other type of downhole treatment design. The filter cake characterization is very essential for well selection of drilling fluid problems and formation damage. Therefore this study is taken up to experimentally investigate the effect of different concentrations of CMC, Starch, Wood fibers, Soda ash, Caustic soda, Bentonite and Barite on filtration loss and formation damages. Three different samples are used in this study at different concentration and a comparison is made. Although the discussion presented here is confined to fluid loss during drilling. Water-based drilling mud’s including Bentonite is wellknown and is being widely used in the petroleum industry. Among the important functions of water-based drilling fluid were to form filter cake on the wall of the well bore, prevent water leakage, and maintain the stability of the well wall. The properties of the water-based drilling fluid, such as the rheology and filtration loss, are affected by the fluid loss additive. Polymers, which are nontoxic, degradable, and environment friendly, are the best choice to be used as drilling fluids additives.
Analysis of IFT (Interfacial Tension) and Viscosity of Various Polymer Based ...IRJESJOURNAL
Abstract: - The purpose of this experiment is to determine IFT and viscosity of various polymer based fluid in Enhanced Oil Recovery (EOR). Viscosity is a property of a liquid and it is defined as the resistance of a liquid to flow. Interfacial tension is the force that holds the surface of a particular phase together. Enhanced oil recovery (EOR) is the implementation of various techniques for increasing the amount of crude oil that can extracted from a well. One of the main techniques in EOR is by pushing crude oil by some fluids. Each fluid has different viscosity and IFT. A correct knowledge of IFT and viscosity of fluids using in EOR gives petroleum engineering tool of efficiently manage the production process of field. This study aimed to experimentally investigate the effect of different concentration Sodium hydroxide (NaOH), Potassium hydroxide (KOH) & Xanthangum on fluids using EOR. Four samples of fluids with different concentration of NaOH, KOH & Xanthangum which is mixed with water and carbonated water were used in this study.
Guidelines for Design of Protective Structures Subjected To Unconfined Explos...IRJESJOURNAL
ABSTRACT:- In recent times, terrorist attacks are happening at major locations that pose significant threat to human life and infrastructure. The terrorist attack, especially the bomb explosion, causes catastrophic damage on structures, leading to loss of life and damage to assets. Thus, protection of structures against such extreme events or loading conditions is of prime importance. The loss of life and damage of the structure can be minimized by implementing suitable mitigation measures in both structural and non-structural design. The objective of this paper is to discuss on the guidelines for analysis and design of structural components of protective structures against blast pressure for an unconfined explosion. This paper covers in detail about the protection categories, risk assessment, Level of protection and damage, blast phenomenon and methods to predicting blast pressure, dynamic analysis, design and detailing
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
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Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Thermodynamic Assessment (Suggestions) Of the Gold-Rubidium System
1. International Refereed Journal of Engineering and Science (IRJES)
ISSN (Online) 2319-183X, (Print) 2319-1821
Volume 6, Issue 6 (June 2017), PP.102-108
www.irjes.com 102 | Page
Thermodynamic Assessment (Suggestions) Of the Gold-Rubidium
System
Achraf Benmechri1
, Ahmed Said Amer1
, Yassine Djaballah1
1
(Laboratoire d’étude Physico-Chimique des Matériaux-Département de Physique, Université de Batna 1,
Algeria)
Abstract: Thermodynamic modellings of the Au–Rb system was carried out by means of the CALPHAD
(calculation of phase diagrams) method. The liquid phase and the intermetallic compounds Au5Rb, Au2Rb,
AuRb and Au7Rb3 and Au3Rb2 (new compounds) in addition to the compound AuRb2 (suspected compound) are
taken into consideration in this optimization. The substitutional solution model was used to describe the liquid
phase. The six compounds are treated as stoichiometric phases. The enthalpies of formation used in these
optimizations were calculated within ab-initio method in precedent work.
Keywords: CALPHAD, Au-Rb system,Thermodynamic assessment, Phase diagram.
I. INTRODUCTION
Many ambiguities and suspicions revolve around the phase diagram of the Au-Rb system. The first
phase diagram established for this system was that of Kienast et al [1]. It contained three compounds Au4Rb,
Au2Rb and AuRb, but Raub and Compton [2], in a subsequent work corrects the structure of the first compound
which becomes Au5Rb instead of Au4Rb. In 1986, Pelton [3] publishes a phase diagram of the Au-Rb system
based on the existence of the three Au5Rb, Au2Rb and AuRb compounds and this phase diagram is reported in
the Massalski [4] compilation. A few years later, Zachwieja [5,6,7,8] tried to reproduce all the compounds
present in the phase diagram. He was able to confirm the existence of the Au5Rb [5] and AuRb [6] compounds,
but he said that he had found no indication of the Au2Rb compound and in his place discovered the Au7Rb [7]
and Au3Rb2 [8] compounds (upstream and downstream of the Au2Rb composition). In 2014, Benmechri et al [9].
Published results in which they confirmed the stability of the Au7Rb3 and Au3Rb2 compounds and the high
probability of the instability or even the lack of the Au2Rb compound. In the same work [9], Benmechri et al.
predict the existence of the AuRb2 composition for which they calculated the elasticity constants and the bulk
modulus. This compound (AuRb2) was mechanically stable at 0K and therefore could well be a composition in
the phase diagram of the system studied.
II. LITARATURE INFORMATION
Only two phase diagrams exist for the Au-Rb system. The first is that of Kienast et al. [1] which is
shown in figure 1. The second is that of Pelton [3] which is shown in figure 2, and in which the three
compounds are formed by peritectic reaction. Taking into account the work of Zachwieja [5,6,7,8] and
Benmechri et al [9], the Pelton phase diagram has become doubtful and for this reason we have decided in this
work to propose restitutions for this phase diagram Based on the Calphad method using the results provided by
the ab-initio method.
Fig. 1 Phase diagram of the Au-Rb system according to Kienast et al. [1]
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Fig. 2 Diagram of phases of the system Au-Rb according to Massalski [3].
III. THERMODYNAMIC MODELS
1. Pure elements
The Gibbs energies functions used in the present work are those collected in the database compiled dy
Dinsdale [10]. We used the SGTE (Scientific Groupe Thermodata Europe) format for the Gibbs energy
functions for the elements i (Au and Rb) in the phase ɸ (liquid, fcc and bcc).
where
and are the relative and absolute Gibbs energy of the element i in the ɸ state. is the molar
enthalpy of the element i at 298.15 K in its standard element reference (SER) state, fcc for Au and bcc for Rb.
2. Intermetallic compounds
All intermetallics are stoichiometric compounds. Their phases Gibbs energy per mol of atoms are given
by the following expression : with p and q : the
number of Au and Rb in the intermetallic .
The enthalpy and entropy of formation were considered as independent of temperature.
3. Liquid solution phase
The solution phases were treated by the substitutional solution model with Redlich-Kister equation
[11]. The sum of reference (ref), ideal (id) and excess (exc) terms gives the Gibbs energy for 1 mol of atoms.
With
Where is the vth-order binary interaction parameter which can be expressed as with and
are the parameters to be optimized.
IV. OPTIMIZATION METHODOLOGY:
Optimization methodology: The optimization of the parameters entering the previous models was
carried out with the calculation code BATNABIN [12]. The latter allows the optimization of the thermodynamic
functions of each phase existing in the system and the restoration of the corresponding phase diagram. The
calculation is based on the collection of a set of experimental and theoretical data concerning the equilibrium
points of the phase diagram and the thermodynamic quantities. These data will allow us to make a linear least
square fit to obtain a mathematical description that reproduces as closely as possible all the experimental data
while allowing favoring certain results which may appear more reliable than others.
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V. RESULTS AND DISCUSSION
The Au-Rb system's phase diagram developed by Pelton [3] shows the existence of only three
compounds: Au5Rb, Au2Rb and AuRb, all three formed by peritectic reaction (FIG.2.). But considering the great
suspicions surrounding the Au2Rb compound, we decided to propose three phase diagrams: the first one
containing just the three compounds mentioned in the Pelton diagram. In the second, in addition to Au5Rb and
AuRb, the existence of the compounds Au7Rb3, Au3Rb2, which must normally replace Au2Rb. The third
encompasses all compounds that have been shown to be stable at 0K (Au5Rb, Au7Rb3, Au3Rb2, AuRb and
AuRb2).
1. First optimization :
In this first optimization, we took into consideration the experimental phase diagram of Pelton [3] with
the three compounds existing in this diagram. We have used as data some equilibrium points of the experimental
diagram as well as the enthalpies of formation of the three compounds that have already been calculated by the
ab initio method by Benmechri et al.[9]. The best optimization is obtained for a development of the free
enthalpy of excess of the liquid phase to order 0. The calculated thermodynamic quantities of all the phases are
summarized in Table 1. The calculated diagram is presented in Figure 3.
Fig. 3. First phase diagram computed by the CALPHAD modeling
Table 1. Parameters of the thermodynamic modeling of the phase diagram shown in Figure 3.
Phase Parameters
Liquid
Au5Rb
Au2Rb
AuRb
Table 2. Temperatures and compositions of the invariant reactions of the phase diagram shown in Figure.3.
Reaction Composition Temperature (K) Type of reaction Reference
0.297 1003 Peritectic [3]
0.167 1025.9 This work
0.410 853 Peritectic [3]
0.464 870.5 This work
0.506 796 Peritectic [3]
0.566 766.2 This work
0.592 424.8 Decomposition This work
0.986 307 Eutectic [3]
0.891 171.8 This work
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2. Second optimization :
In this second optimization, the compounds Au5Rb and AuRb have been taken into consideration in
addition to the two compounds Au7Rb3 and Au3Rb2 which we have already found to be stable at 0K. We have
used as data some equilibrium points of the experimental diagram as well as the enthalpies of formation of the
three compounds that have already been calculated by the ab initio method. The best optimization is obtained
for a development of the free enthalpy of excess of the liquid phase to order 0. The calculated thermodynamic
quantities of all phases are summarized in Table 3. The calculated diagram is shown in Figure 4.
Fig. 4. Second phase diagram computed by the CALPHAD modelling
Table 3. Parameters of the thermodynamic modeling of the phase diagram shown in figure 4.
Phase Parameters
Liquid
Au5Rb
Au7Rb3
Au3Rb2
AuRb
Table 4. Temperatures and compositions of the invariant reactions of the phase diagram shown in Figure 4.
Reaction Composition Temperature (K) Type of reaction Reference
0.167 1006.23 Eutectic This work
0.303 880.8 Peritectic This work
0.439 766.1 Peritectic This work
0.592 585.5 Peritectic This work
0.986 307 Eutectic [3]
0.870 90.9 This work
3. Third optimization :
In this third optimization, we considered the Au5Rb, AuRb, Au7Rb3 and Au3Rb2 compounds and also
the suspected AuRb2 compound that our calculations have asserted is mechanically stable at 0K. We have used
as data some equilibrium points of the experimental diagram as well as the enthalpies of formation of the three
compounds that have already been calculated by the ab initio method. The best optimization is obtained for a
development of the free enthalpy of excess of the liquid phase to order 0. The calculated thermodynamic
quantities of all phases are summarized in Table 5. The calculated diagram is presented in Figure 5.
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Fig. 5 Third phase diagram computed by the CALPHAD modelling
Table 5. Parameters of the thermodynamic modeling of the phase diagram shown in figure 5.
Phase Parameters
Liquid
Au5Rb
Au7Rb3
Au3Rb2
AuRb
AuRb2
Table 6. Temperatures and compositions of the invariant reactions of the phase diagram shown in Figure 5.
Reaction Composition Temperature (K) Type of reaction Reference
0.167 1009.23 Eutectic This work
0.320 880.8 Peritectic This work
0.440 766.1 Peritectic This work
0.592 585.9 Peritectic This work
0.708 424.9 Peritectic This work
0.904 175.7 Eutectic This work
4. Discussion
The first restitution, which only takes into account the Au5Rb, Au2Rb and AuRb stoichiometries, shows
that the Au2Rb compound is metastable at 0K, while the other two compounds are perfectly stable.
In the second restitution, we assumed the existence of the Au7Rb3 and Au3Rb2 compounds that were
discovered by Zachwieja [7,8] and we omitted the Au2Rb compound that Zachwieja could not form and its
attempts resulted in the two compounds Au7Rb3 and Au3Rb2. This second restitution shows that at 0K the
Au5Rb and AuRb compounds, as well as Au7Rb3 and Au3Rb2 are thermodynamically stable, like the results
provided by the ab-initio method. The result obtained by the two methods (ab-initio and Calphad) supports the
probability that the compound Au2Rb is not a stable compound (at the limit of 0K) because this favors the
questions posed and Zachwieja's suspicions about the existence of this compound.
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The third restitution, which took into account in addition to the compounds of the second restitution the
compound AuRb2 of which we have predicted the existence, provided the information that the compounds
Au5Rb, AuRb, Au7Rb3, Au3Rb2 as well as AuRb2 are all stable at 0K. This result provided by the Calphad
method is consistent with ab-initio results which also resulted in both the high probability of existence and the
stability of the Au7Rb3, Au3Rb2 and AuRb2 compounds. A comparison based on the results of the third
restitution and the results of the ab initio method shows a very high coherence and correspondence concerning
the enthalpies of formation (Table 7 and figure 6) shows the training enthalpies obtained using the two methods
used.
Table 7. Enthalpies of formations of the defined compounds (by the ab-initio and Calphad methods).
Compound
Enthalpies of formation ( kJ/mol-atom)
Ab-initio method Calphad method
Au5Rb -19.1 -19.0
Au7Rb3 -28.1 -27.0
Au3Rb2 -30.7 -29.4
AuRb -28.3 -28.1
AuRb2 -18.8 -22.2
Fig. 6 Enthalpies of formation of Au–Rb intermetallics.
VI. CONCLUSION
Using the results provided by the DFT, we have been able to reconstruct the phase diagram of the Au-Rb
system according to three possibilities.
The basic state of the system was obtained and shows that the compositions Au5Rb, Au7Rb3, Au3Rb2, AuRb
as well as AuRb2 are all stable there is a great coherence between the results obtained by the calculation ab
initio and those of the method Calphad.
The enthalpies of formation calculated by the ab-initio method [9] and found at the end of the restoration of
the phase diagram by the Calphad method show that the compound AuRb2 can represent a new compound
in this system
The current results strongly suggest that the continuation of the experimental investigation is necessary for
the Au-Rb system to confirm the inferences and conclusions that are obtained by our study.
REFERENCES
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