The document discusses the effect of covalent bond radius on the melting temperature of organic compounds. It proposes that increasing or decreasing the covalent radius value can create new organic compounds or properties, as the distance between atoms will change. A larger covalent radius results in increased distance between atoms, leading to lower melting points, boiling points, and tensile strength. The document constructs virtual models of organic structures to demonstrate how properties vary with interatomic distance, which is affected by covalent radius. It concludes that changing parameters like pressure or temperature to modify covalent bond radius can produce new organic compound properties while keeping monomer structure the same.
Influence of Tetra Alkyl Ammonium Cation and Temperature on Molecular Interac...IOSRJAC
Ultrasonic velocity (u), density (ρ), viscosity (η) and related acoustical parameters such as adiabatic compressibility (β), free energy (∆G), internal pressure (πi), relaxation time (τ) and acoustic impedance (z) have been computed using standard relation for tetra alkyl ammonium cation (Et4N + , Pr4N + , Bu4N + , and Pen4N + ) in binary liquid mixtures of 1, 4 - Dioxane and N, N – Dimethyl Formamide was prepared of 0.14M on different percentage compositions over the temperature range from 303.15K to 323.15K with the interval of 10K under room pressure to investigate inter - ionic interactions. The densities were measured by Magnetic Float Densitometer. Transport properties provide a deep and meaningful insight of various interactions taking place. It has been observed that the influence of small as well as large alkyl chain length of tetra alkyl ammonium cations (R4N + ), in terms of shape and ionic size with the DMF solvent in the presence of Dioxane, is helpful in investigating the molecular interactions, molecular rearrangement, molecular association etc
Experimental and Quantum Chemical Studies on the Corrosion Inhibition Perform...inventionjournals
Corrosion inhibition nature of a synthesized Schiff’s base was studied on the corrosion of mild steel in 1.0 M HCl using weight loss and electrochemical methods. The results indicated that the synthesized Schiff base is an effective inhibitor in reducing the corrosion of mild steel in 1.0 M HCl solution. The inhibitor efficiency of inhibitor increased with inhibitor concentration and showed maximum inhibition efficiency at 300 ppm concentration. The adsorption of inhibitor molecules on to the metal surface obeyed Langmuir Adsorption isotherm. The adsorption mechanism involved both physical and chemical adsorptions. The potentiodynamic polarization studies showed that the inhibitor is a mixed typed inhibitor with more cathodic nature. Potential of zero charge was also determined and the adsorption mechanism discussed. Quantum mechanical studies showed that the Schiff base molecules have the strong tendency to donate electron pairs to the metallic atoms on the surface
Influence of Tetra Alkyl Ammonium Cation and Temperature on Molecular Interac...IOSRJAC
Ultrasonic velocity (u), density (ρ), viscosity (η) and related acoustical parameters such as adiabatic compressibility (β), free energy (∆G), internal pressure (πi), relaxation time (τ) and acoustic impedance (z) have been computed using standard relation for tetra alkyl ammonium cation (Et4N + , Pr4N + , Bu4N + , and Pen4N + ) in binary liquid mixtures of 1, 4 - Dioxane and N, N – Dimethyl Formamide was prepared of 0.14M on different percentage compositions over the temperature range from 303.15K to 323.15K with the interval of 10K under room pressure to investigate inter - ionic interactions. The densities were measured by Magnetic Float Densitometer. Transport properties provide a deep and meaningful insight of various interactions taking place. It has been observed that the influence of small as well as large alkyl chain length of tetra alkyl ammonium cations (R4N + ), in terms of shape and ionic size with the DMF solvent in the presence of Dioxane, is helpful in investigating the molecular interactions, molecular rearrangement, molecular association etc
Experimental and Quantum Chemical Studies on the Corrosion Inhibition Perform...inventionjournals
Corrosion inhibition nature of a synthesized Schiff’s base was studied on the corrosion of mild steel in 1.0 M HCl using weight loss and electrochemical methods. The results indicated that the synthesized Schiff base is an effective inhibitor in reducing the corrosion of mild steel in 1.0 M HCl solution. The inhibitor efficiency of inhibitor increased with inhibitor concentration and showed maximum inhibition efficiency at 300 ppm concentration. The adsorption of inhibitor molecules on to the metal surface obeyed Langmuir Adsorption isotherm. The adsorption mechanism involved both physical and chemical adsorptions. The potentiodynamic polarization studies showed that the inhibitor is a mixed typed inhibitor with more cathodic nature. Potential of zero charge was also determined and the adsorption mechanism discussed. Quantum mechanical studies showed that the Schiff base molecules have the strong tendency to donate electron pairs to the metallic atoms on the surface
DETONATION AND COMBUSTION OF NEW HETEROGENEOUS COMPOSITE EXPLOSIVES CONTAININ...Robert Weinheimer
A water free slurry method for explosive flegmatization and multi-components rich-fuel macroscopic granules preparation was elaborated with success. Confined explosion investigations showed that the structure of the
macroscopic granular composite, charge type, aluminium particle sizes and oxygen availability inside the explosion chamber affect strongly the QSP and the aluminium after-burning reactions in the confined space.
2018 khodan an-porous monoliths consisting of aluminum oxyhydroxide nanofibrilsAnatoleNKhodan
Abstract We present a study on the chemical and structural transformations in highly porous monolitic materials consisting of the nanofibrils of aluminum oxyhydroxides (NOA, Al2O3·nH2O) in the temperature range 20– 1700 °C. A remarkable property of the NOA material is the preservation of the monolithic state during annealing over the entire temperature range, although the density of the monolith increases from ~0.02 up to ~3 g/cm3, the total porosity decreases from 99.3 to 25% and remains open up to 4 h annealing at the temperature ~1300 °C. The physical parameters of NOA monoliths such as density, porosity, specific area were studied and a simple physical model describing these parameters as the function of the average size of NOA fibrils—the basic element of 3D structure—was proposed. The observed thermally induced changes in composition and structure of NOA were successfully described and two mechanisms of mass transport in NOA materials were revealed. (i) At moderate temperatures (T ≤ 800 °C), the mass transport occurs along a surface of amorphous single fibril, which results in a weak decrease of the length-to-diameter aspect ratio from the initial value ~24 till ~20; the corresponding NOA porosity change is also small: from initial ~99.5 to 98.5%. (ii) At high temperatures (T > 800 °C), the mass transport occurs in the volume of fibrils, that results in changes of fibrils shape to elliptical and strong decrease of the aspect ratio down to ≤ 2; the porosity of NOA decreases to 25%. These two regimes are characterized by activation energies of 28 and 61 kJ/mol respectively, and the transition temperature corresponds to the beginning of γ-phase crystallization at 870 °C.
Inhibition, kinetic and thermodynamic effects of new Azo derivatives on iron ...Al Baha University
This investigation is designed to apply an advanced kinetic-thermodynamic model on the experimental data obtained from acidic and alkaline corrosion of iron using mono- and bis-azo dyes as corrosion inhibitors. The inhibition properties of the tested azo dyes on corrosion of iron in HNO3 and NaOH media were analyzed by gravimetric, thermometric and polarization measurements. The three studied methods gave consistent results. Polarization study showed that all the inhibitors are mixed type in acidic, act mainly as cathodic in alkaline solution. The synthesized azo dye derivatives exhibit good inhibition properties, obeys the Frumkin adsorption isotherm. The large values of the change in the standard free energy of adsorption (∆Goads), equilibrium constant (Kads) and binding constant (Kb) revealed that the reactions proceed spontaneously and result in highly efficient physisorption mechanism and stronger electrical interaction between the double layer existing at the phase boundary and the adsorbing molecules. The inhibition efficiency depends on the number of adsorption oxygen sites (OH and OMe groups), their charge density and π-electron clouds. The inhibition efficiency evaluated via theoretical methods was well accorded with reported experimental ones, following the same order as: -naphthyl- ligand > -naphthyl>p-anisdine>p-toluidine >o-toluidine >m-toluidine derivative. This research might provide a theoretical inhibition performance evaluation approach for homologous inhibitors.
Some basic concepts of chemistry
chapter 1 of class 11.
N.B : This is for reference only. Students are advised not to copy, but to take ideas and do the work in their own style-it builds your imagination.
Influence of the alkyl chain length of alkyltriazoles on the corrosion inhibi...Al Baha University
Abstract. Steel is an important material and has been widely used in today's industrial production. Using organic
corrosion inhibitors is an effective means to prevent steel from corrosion. Generally, the molecular structures of
inhibitors can have a major impact on their corrosion inhibition efficiency. In this work, the influence of alkyl chain
length of three alkyltriazoles on the corrosion inhibition of iron has been investigated by density functional based tight
binding (DFTB) approach. Several typical descriptors such as frontier molecular orbital, adsorption energy, density of
states have been discussed in detail. Our findings will contribute to the understanding of the inhibition mechanism and
the designing of novel corrosion inhibitors.
A Study of Electrical and Magnetic Properties of La+3 Substituted Ni-Zn Ferritesiosrjce
IOSR Journal of Applied Physics (IOSR-JAP) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of physics and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in applied physics. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Interaction of Components in Molecular Optoelectronics for the Next Generati...Scientific Review SR
The interaction of molecular optoelectronic components on the molecular scale were studied where
the solvent shell indicating the influence of the medium was found to be surprisingly small. The transport of
energy as resonant energy transfer covers distances of about 5 nm and was shown not to proceed by a simple to
dipole dipole interaction with typical restrictions, but by a more complex mechanism. Furthermore, a novel -type of
far-reaching interactions of electronically excited structures until macroscopic dimensions were fond and may be
applied for addressing molecular structures by conventional electronics
DETONATION AND COMBUSTION OF NEW HETEROGENEOUS COMPOSITE EXPLOSIVES CONTAININ...Robert Weinheimer
A water free slurry method for explosive flegmatization and multi-components rich-fuel macroscopic granules preparation was elaborated with success. Confined explosion investigations showed that the structure of the
macroscopic granular composite, charge type, aluminium particle sizes and oxygen availability inside the explosion chamber affect strongly the QSP and the aluminium after-burning reactions in the confined space.
2018 khodan an-porous monoliths consisting of aluminum oxyhydroxide nanofibrilsAnatoleNKhodan
Abstract We present a study on the chemical and structural transformations in highly porous monolitic materials consisting of the nanofibrils of aluminum oxyhydroxides (NOA, Al2O3·nH2O) in the temperature range 20– 1700 °C. A remarkable property of the NOA material is the preservation of the monolithic state during annealing over the entire temperature range, although the density of the monolith increases from ~0.02 up to ~3 g/cm3, the total porosity decreases from 99.3 to 25% and remains open up to 4 h annealing at the temperature ~1300 °C. The physical parameters of NOA monoliths such as density, porosity, specific area were studied and a simple physical model describing these parameters as the function of the average size of NOA fibrils—the basic element of 3D structure—was proposed. The observed thermally induced changes in composition and structure of NOA were successfully described and two mechanisms of mass transport in NOA materials were revealed. (i) At moderate temperatures (T ≤ 800 °C), the mass transport occurs along a surface of amorphous single fibril, which results in a weak decrease of the length-to-diameter aspect ratio from the initial value ~24 till ~20; the corresponding NOA porosity change is also small: from initial ~99.5 to 98.5%. (ii) At high temperatures (T > 800 °C), the mass transport occurs in the volume of fibrils, that results in changes of fibrils shape to elliptical and strong decrease of the aspect ratio down to ≤ 2; the porosity of NOA decreases to 25%. These two regimes are characterized by activation energies of 28 and 61 kJ/mol respectively, and the transition temperature corresponds to the beginning of γ-phase crystallization at 870 °C.
Inhibition, kinetic and thermodynamic effects of new Azo derivatives on iron ...Al Baha University
This investigation is designed to apply an advanced kinetic-thermodynamic model on the experimental data obtained from acidic and alkaline corrosion of iron using mono- and bis-azo dyes as corrosion inhibitors. The inhibition properties of the tested azo dyes on corrosion of iron in HNO3 and NaOH media were analyzed by gravimetric, thermometric and polarization measurements. The three studied methods gave consistent results. Polarization study showed that all the inhibitors are mixed type in acidic, act mainly as cathodic in alkaline solution. The synthesized azo dye derivatives exhibit good inhibition properties, obeys the Frumkin adsorption isotherm. The large values of the change in the standard free energy of adsorption (∆Goads), equilibrium constant (Kads) and binding constant (Kb) revealed that the reactions proceed spontaneously and result in highly efficient physisorption mechanism and stronger electrical interaction between the double layer existing at the phase boundary and the adsorbing molecules. The inhibition efficiency depends on the number of adsorption oxygen sites (OH and OMe groups), their charge density and π-electron clouds. The inhibition efficiency evaluated via theoretical methods was well accorded with reported experimental ones, following the same order as: -naphthyl- ligand > -naphthyl>p-anisdine>p-toluidine >o-toluidine >m-toluidine derivative. This research might provide a theoretical inhibition performance evaluation approach for homologous inhibitors.
Some basic concepts of chemistry
chapter 1 of class 11.
N.B : This is for reference only. Students are advised not to copy, but to take ideas and do the work in their own style-it builds your imagination.
Influence of the alkyl chain length of alkyltriazoles on the corrosion inhibi...Al Baha University
Abstract. Steel is an important material and has been widely used in today's industrial production. Using organic
corrosion inhibitors is an effective means to prevent steel from corrosion. Generally, the molecular structures of
inhibitors can have a major impact on their corrosion inhibition efficiency. In this work, the influence of alkyl chain
length of three alkyltriazoles on the corrosion inhibition of iron has been investigated by density functional based tight
binding (DFTB) approach. Several typical descriptors such as frontier molecular orbital, adsorption energy, density of
states have been discussed in detail. Our findings will contribute to the understanding of the inhibition mechanism and
the designing of novel corrosion inhibitors.
A Study of Electrical and Magnetic Properties of La+3 Substituted Ni-Zn Ferritesiosrjce
IOSR Journal of Applied Physics (IOSR-JAP) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of physics and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in applied physics. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Interaction of Components in Molecular Optoelectronics for the Next Generati...Scientific Review SR
The interaction of molecular optoelectronic components on the molecular scale were studied where
the solvent shell indicating the influence of the medium was found to be surprisingly small. The transport of
energy as resonant energy transfer covers distances of about 5 nm and was shown not to proceed by a simple to
dipole dipole interaction with typical restrictions, but by a more complex mechanism. Furthermore, a novel -type of
far-reaching interactions of electronically excited structures until macroscopic dimensions were fond and may be
applied for addressing molecular structures by conventional electronics
International Journal of Research in Engineering and Science is an open access peer-reviewed international forum for scientists involved in research to publish quality and refereed papers. Papers reporting original research or experimentally proved review work are welcome. Papers for publication are selected through peer review to ensure originality, relevance, and readability.
A DFT STUDY OF CO GAS ADSORPTION ON METAL DOPED GRAPHENE SHEETvivatechijri
The interaction of Ni-doped graphene sheet with CO molecule is investigated using density
functional theory simulation to analyze the reactivity of doped graphene towards CO molecule. The adsorption
energy is calculated for energetically favorable adsorption of CO on doped graphene sheet. Our result indicates
that the structural properties of NI-doped graphene sheet are influenced by the adsorption of CO. The
electronic band structure result for CO adsorbed on the doped graphene sheet shows the significant changes in
the electronic properties of Ni-doped graphene.
An experimental and analytical study to show the effect of theOzyegin University
The main purpose of this paper is showing the enhancement of thermal conductivity
of the epoxy with many percentages of carbon fiber into it. In addition to pure epoxy and pure
carbon fiber, three percentages of carbon fiber are used in this study, which are 20, 40, and 60%,
respectively. All of these samples are tested at different values of applied powers (input power)
(10, 25, 40, 55, and 70 W). A comparison between pure epoxy, pure carbon fiber and the
composites that involve all these percentages is done. In addition, the study involves the effect of
these simples on the performances of both Aluminum and cooper heat sinks.
It is shown from the results that increasing in fiber carbon percentage leads to increase in
thermal conductivity of composite, heat sink junction temperature, overall heat sink efficiency,
and density of composite. The increasing in overall heat sink efficiency leads to decrease the
height of heat sink, and consequently decreasing its cost. For instance at 70 W power input,
increasing the fiber carbon percentage(from 0 to 100%) for each material of heat sink, leads to
decrease the average fin length by 48% ,decrease the manufacturing cost by 47%, increase in
junction temperature by 65 %, and increase fin efficiency by 2.5 %.
Optical Control of Selectivity of High Rate CO2 Photoreduction Via Interband-...Pawan Kumar
Photonic crystals consisting of TiO2 nanotube arrays (PMTiNTs) with periodically modulated diameters were fabricated using a precise charge-controlled pulsed anodization technique. The PMTiNTs were decorated with gold nanoparticles (Au NPs) to form plasmonic photonic crystal photocatalysts (Au-PMTiNTs). A systematic study of CO2 photoreduction performance on as-prepared samples was conducted using different wavelengths and illumination sequences. A remarkable selectivity of the mechanism of CO2 photoreduction could be engineered by merely varying the spectral composition of the illumination sequence. Under AM1.5 G simulated sunlight (pathway#1), the Au-PMTiNTs produced methane (302 µmol h-1) from CO2 with high selectivity (89.3%). When also illuminated by a UV-poor white lamp (pathway#2), the Au-PMTiNTs produced formaldehyde (420 µmol h-1) and carbon monoxide (323 µmol h-1) with almost no methane evolved. We confirmed the photoreduction results by 13C isotope labeling experiments using GC-MS. These results point to optical control of the selectivity of high-rate CO2 photoreduction through selection of one of two different mechanistic pathways. Pathway#1 implicates electron-hole pairs generated through interband transitions in TiO2 and Au as the primary active species responsible for reducing CO2 to methane. Pathway#2 involves excitation of both TiO2 and surface plasmons in Au. Hot electrons produced by plasmon damping and photogenerated holes in TiO2 proceed to reduce CO2 to HCHO and CO through a plasmonic Z-scheme.
the effect of nickel incorporation on some physical properties of epoxy resinINFOGAIN PUBLICATION
The J-E characteristics of samples of epoxy resins mixed with nickel powder in different concentrations have been tested and a log-log straight line behaviour in both the low- and high field regions is observed. Ni-concentration has significant influence on the calculated constants of the J-E relationship. The d.c. electrical resistivity (ρ) of the samples are measured from the room temperature up to about 400 K. The variation of ρ with T obeys the exponential relation of ordinary dielectrics in three temperature regions. The parameters characterizing the ρ -T dependence change considerably with Ni-concentration. Due to the existence of nickel in different concentration a "true" compensation effect is observed with three characteristic compensation temperatures. The mechanical hardness of the samples was investigated as a function of Ni-concentration.
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.
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.
PHP Frameworks: I want to break free (IPC Berlin 2024)Ralf Eggert
In this presentation, we examine the challenges and limitations of relying too heavily on PHP frameworks in web development. We discuss the history of PHP and its frameworks to understand how this dependence has evolved. The focus will be on providing concrete tips and strategies to reduce reliance on these frameworks, based on real-world examples and practical considerations. The goal is to equip developers with the skills and knowledge to create more flexible and future-proof web applications. We'll explore the importance of maintaining autonomy in a rapidly changing tech landscape and how to make informed decisions in PHP development.
This talk is aimed at encouraging a more independent approach to using PHP frameworks, moving towards a more flexible and future-proof approach to PHP development.
DevOps and Testing slides at DASA ConnectKari Kakkonen
My and Rik Marselis slides at 30.5.2024 DASA Connect conference. We discuss about what is testing, then what is agile testing and finally what is Testing in DevOps. Finally we had lovely workshop with the participants trying to find out different ways to think about quality and testing in different parts of the DevOps infinity loop.
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.
UiPath Test Automation using UiPath Test Suite series, part 3DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 3. In this session, we will cover desktop automation along with UI automation.
Topics covered:
UI automation Introduction,
UI automation Sample
Desktop automation flow
Pradeep Chinnala, Senior Consultant Automation Developer @WonderBotz and UiPath MVP
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
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.
State of ICS and IoT Cyber Threat Landscape Report 2024 previewPrayukth K V
The IoT and OT threat landscape report has been prepared by the Threat Research Team at Sectrio using data from Sectrio, cyber threat intelligence farming facilities spread across over 85 cities around the world. In addition, Sectrio also runs AI-based advanced threat and payload engagement facilities that serve as sinks to attract and engage sophisticated threat actors, and newer malware including new variants and latent threats that are at an earlier stage of development.
The latest edition of the OT/ICS and IoT security Threat Landscape Report 2024 also covers:
State of global ICS asset and network exposure
Sectoral targets and attacks as well as the cost of ransom
Global APT activity, AI usage, actor and tactic profiles, and implications
Rise in volumes of AI-powered cyberattacks
Major cyber events in 2024
Malware and malicious payload trends
Cyberattack types and targets
Vulnerability exploit attempts on CVEs
Attacks on counties – USA
Expansion of bot farms – how, where, and why
In-depth analysis of the cyber threat landscape across North America, South America, Europe, APAC, and the Middle East
Why are attacks on smart factories rising?
Cyber risk predictions
Axis of attacks – Europe
Systemic attacks in the Middle East
Download the full report from here:
https://sectrio.com/resources/ot-threat-landscape-reports/sectrio-releases-ot-ics-and-iot-security-threat-landscape-report-2024/
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.
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.
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
Let's dive deeper into the world of ODC! Ricardo Alves (OutSystems) will join us to tell all about the new Data Fabric. After that, Sezen de Bruijn (OutSystems) will get into the details on how to best design a sturdy architecture within ODC.
Smart TV Buyer Insights Survey 2024 by 91mobiles.pdf91mobiles
91mobiles recently conducted a Smart TV Buyer Insights Survey in which we asked over 3,000 respondents about the TV they own, aspects they look at on a new TV, and their TV buying preferences.
LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...DanBrown980551
Do you want to learn how to model and simulate an electrical network from scratch in under an hour?
Then welcome to this PowSyBl workshop, hosted by Rte, the French Transmission System Operator (TSO)!
During the webinar, you will discover the PowSyBl ecosystem as well as handle and study an electrical network through an interactive Python notebook.
PowSyBl is an open source project hosted by LF Energy, which offers a comprehensive set of features for electrical grid modelling and simulation. Among other advanced features, PowSyBl provides:
- A fully editable and extendable library for grid component modelling;
- Visualization tools to display your network;
- Grid simulation tools, such as power flows, security analyses (with or without remedial actions) and sensitivity analyses;
The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
What you will learn during the webinar:
- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
Knowledge engineering: from people to machines and back
B04710508
1. IOSR Journal of Engineering (IOSRJEN) www.iosrjen.org
ISSN (e): 2250-3021, ISSN (p): 2278-8719
Vol. 04, Issue 07 (July. 2014), ||V1|| PP 05-08
International organization of Scientific Research 5 | P a g e
The Effect of the Radius of Covalent Bond on Melting
Temperature of Organic Compounds
Ajeel F. A. Al-Zafeeri
The Public Authority For Applied Education And Training
The Higher Energy Institute –Chemical Processes Dept. Kuwait
Abstract: - This paper presents a discussion of the effects of covalent radius value in producing new organic
compounds, the value of covalent bond radius will be changed either by increasing or decreasing and hence a
new organic compounds or new properties organic compounds will be created. It is found that the value of the
covalent radius has really considerable effects on changing organic compounds properties such as melting point
temperature.
Keywords: - Organic Compounds, Covalent Radius, Chemical Bonds, Organic Compounds Properties,
Thermodynamics.
I. INTRODUCTION
The stability of a covalent bond results from a large quantity of electron density in the bonding region,
the space between the two nuclei. In the bonding region, the electrons are nearly close to both nuclei, resulting
in a lowering of the overall energy .The bonding electrons also mask the positive charges of the nuclei, so the
nuclei do not make repulsion for each other as much as they would otherwise. There is always an optimum
distance for the two bonded nuclei .If such nuclei are too far apart, their attraction for the bonding electrons is
diminished. If such nuclei are too close together, their electrostatic repulsion pushes them apart .The inter-
nuclear distance where attraction and repulsion are balanced, which also gave the minimum energy (the
strongest bond), is called the bond length. See fig.1, [9].
Fig. 1 bonding region between two atoms, [9].
Little of researches discussed the effects of covalent radius value in producing new organic compounds
properties, Chung C. et. al., in this work a series of organic ammonium ions were exchanged onto clay minerals
montmorillonite and hectorite . Thermal effects on these surface modified organic-inorganic complexes were
investigated by using the differential thermal analysis and heating-oscillating X-ray diffraction methods. The
researcher found that the organo-clay complexes were dehydrogenated at temperatures from 180 to 350 ˚C~
2. The Effect of the Radius of Covalent Bond on Melting Temperature of Organic Compounds
International organization of Scientific Research 6 | P a g e
depending on the organic cation used .Following the dehydrogenation, hydrolysis was found that it can take
place leaving a layer of "carbon "on the clay surface. The "carbon "was then oxidized at a temperature of about
550˚C. Investigation of possible correlations between the boiling point, ionization potential, molecular structure
activation energy, dehydrogenation and basicity, and carbon atoms bond distances of the organic cations showed
that the geometric factors outweighed the acid, some chemical and electronic factors in determining the effect of
montmorillonite and hectorite toward the dehydrogenation of organic ions were exchanged on the surfaces of
these clay minerals, [2]. Nicholas J. Turro, exchanging the supramolecular organic photochemistry from soft-
matter hosts (micelles) and hard-matter hosts (porous solids) were discussed with an emphasis on how
noncovalent interactions, which are at the heart of supramolecular chemistry, can be systematically exploited to
control the catalytic and magnetic effects on the formation of covalent bonds from photochemically produced
pairs of radical, [3].
Steven S., et al. Discussed the solid-phase measurements which are typically made using solvent
extraction or thermal headspace analysis. The high temperatures and chemical solvents associated with such
methods can modify the physical structure of polymeric materials and consequently affect mass transfer
characteristics .To measure solid-phase concentrations under conditions resembling those in which the material
would be installed in an indoor environment, a new technique for measuring volatile organic compounds
concentrations in vinyl flooring (VF) and similar materials were developed. A 0.09 m2
section of new vinyl
flooring was punched randomly to produce approximately 2000.78-cm2
disks .The disks were milled to a
powder at -140˚ C to simultaneously homogenize the material and reduce the diffusion path length without loss
of volatile organic compounds. volatile organic compounds were extracted from the vinyl flooring particles at
room temperature by fluidized bed desorption and by direct thermal desorption at elevated temperatures. The
volatile organic compounds in the extraction gas from fluidized bed desorption and direct thermal desorption
were collected on sorbent tubes and analyzed by gas chromatography/mass spectrometry .Seven volatile
organic compounds emitted by vinyl flooring were quantified .Concentration measurements by fluidized bed
desorption ranged from 5.1 µg-1 g vinyls flooring for n-hexadecane to 130 μg -1g vinyls flooring for phenol .
Concentrations measured by direct thermal desorption were higher than concentrations measured by fluidized
bed desorption. Differences between fluidized beds desorption and direct thermal desorption results may be
explained using free-volume/dual-mobility sorption theory, [5].
B. M. Mikhailov, discussed the covalent radii of carbon in the sp2
and sp and stated that their values are
ranging from 0.73 and 0.69 A, respectively, also the phenomenon of hyper conjugation of the first order ( , -
conjugation) really does not exist. Also the researcher found that the shortening of such single carbon-carbon
bond adjacent to a multiple bond is due not to the displacement of electrons by hyper conjugational (resonance-
mesomerism) mechanism, but it refers to an orbital effect: it is also found that a reduction in the covalent radii
of carbon with increase in the contribution of bonding orbitals of this type. The author found that in molecules
containing alternating multiple bonds the delocalization of -electrons and leveling out of lengths of bonds do
not occur. In such molecules the mesomeric (conjugation) effect (static effect of , conjugation) postulated
by resonance-mesomerism theory does not appear. The shortening of single bonds observed in molecules
containing alternating multiple bonds is due to an orbital effect, [1]. Nicholas J. Turro, Exemplars of
supramolecular organic photochemistry from soft-matter hosts (micelles) and hard-matter hosts (porous solids)
were discussed with an emphasis on how non-covalent interactions, which are at the heart of supramolecular
chemistry, can be systematically exploited to control the catalytic and magnetic effects on the formation of
covalent bonds from photochemically produced pairs of radicals.[10].
Methods and materials
Covalent radius in organic compounds has an important role in producing new properties for such
compounds; hence new compounds are resulted. Covalent radius variations in organic structures contributing in
producing new compounds. In this work a virtual model is constructed to show the effects of covalent radius in
properties of organic compounds.
Let us have the two different organic structures (figure 2).
R2
R1
90˚ …………….. 90˚ …………………………….
R1 R2
A B
3. The Effect of the Radius of Covalent Bond on Melting Temperature of Organic Compounds
International organization of Scientific Research 7 | P a g e
Fig. 2 Same organic compounds (A, and B) with same structure different covalent radii
From the two organic configurations it is clear that distance between the two sub atoms (colored in blue) is
differ from the first construction (A) and (B). In A the distance is equal to
2
11 2RD (1)
While in the second configuration the distance can be given as
2
22 2RD (2)
II. RESULTS AND DISCUSSION
Since R1 is greater than R2 then D2 is less than D1. This difference in distance makes the properties of
same organic compounds different either in boiling point, melting point, tensile strength and other mechanical
properties, since the total length and width of the organic compounds will be differed. It is found that the
distances between the sub-atoms in the organic compounds affected by the covalent radius i.e as the covalent
radius increases the distance and the total length of the compound increase, and hence the properties of the
organic compound change. Melting points, boiling point, tensile strength of such organic compounds are
decrease as the length of the compound increases i.e. as D increases such that
[M,B,T]=[M0,B0,T0]-C(D) (3)
where
M: is the melting point temperature, B: is the boiling temperature, T: is the tensile strength of the
material. M0, B0, and T0: are the base values of the last properties respectively. C: is a constant, and D is the
distance between atoms in the organic compounds. Such relations can be represented as in figure (3).
Fig. (3) Melting point variation with the covalent radius change.
Fig.3 represents a demonstration for the properties of organic compounds as a relation with the atoms distance
(D), it is clear that as the distance (D) increases the value of melting point, and also by the same behavior
boiling point, and tensile strength of such compounds decrease.
III. CONCLUSION
The main conclusion can be drawn up from this discussion that to produce a new properties for organic
compounds having the same monomers and same structure is by changing up the covalent bond radius, this can
be made by changing up pressure, temperature, or any other parameter. This will produce some new properties
for organic compounds.
4. The Effect of the Radius of Covalent Bond on Melting Temperature of Organic Compounds
International organization of Scientific Research 8 | P a g e
REFERENCES
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[2]. CHUNG CHI CHOU and JAMES L .McATEE, Jr.1969, Thermal Decomposition Of Organo-ammonium
Compounds Exchanged Onto Montmorillonite And Hectorit, Clays and Clay Minerals, 1969, Vol .17, pp .
339-346 .Pergamon Press .
[3]. Nicholas J .Turro, 2002, supramolecular organic photochemistry :Control of covalent bond formation
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[4]. S.A.Abd El–Maksoud, 2008, The Effect of Organic Compounds on the Electrochemical Behavior of
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[5]. Steven S .Cox, Alfred T .Hodgson, and John C .Little, 2002, Measuring Concentrations of Volatile
Organic Compounds in Vinyl Flooring, LBNL-47086, Accepted by Journal of the Air & Waste
Management Association, 04/01.
[6]. Koros, W., Chan, A., and Paul, D .Sorption and transport of various gases in polycarbonate, Journal of
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[7]. Schwarzenbach, R.; Gschwend, P.M.; Imboden, D.M .Environmental Organic Chemistry; John Wiley &
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[8]. Cox, S.S.; Little, J.C.; Hodgson, A.T .A New Method to Predict Emission Rates of Volatile Compounds
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[9]. Graham S., and Craig F., 2000, Organic Chemistry, 7th
edition, John Wiley, pp: 110-150, 1-50.
[10]. Nicholas J. Turro, 2002, Supramolecular organic photochemistry: Control of covalent bond formation
through non-covalent supramolecular interactions and magnetic effects, PNAS _ April 16, 2002 _ vol. 99
_ no. 8 _ 4805–4809.