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Quasi-particle Contribution in Thermal Expansion and Thermal Conductivity in Metals
Get PDFIn this paper the modified Landau theory of Fermi Liquids was used to compute the thermal expansion and thermal conductivity of quasi-particles in metals. The result revealed that as temperature increases the thermal expansion of quasi-particles in metals increases in all the metals investigated. It is also observed that as the electron density parameter increases the thermal expansion of quasi-particles increases. This shows that at low density region the thermal expansion of quasi-particles is large. The result obtained for the thermal conductivity of quasi-particles in metals revealed that for all the metals computed the thermal conductivity of quasi-particles decreases as temperature increases. This seems to suggest that as temperature increases the separation between quasi-particles increases because they are not heavy particles hence, the rate of absorbing heat decreases. The computed thermal expansion and thermal conductivity of quasi-particles are in better agreement with experimental values. This suggests that the introduction of the electron density parameter is promising in predicting the contribution of quasi-particles to the bulk properties of metals. This study revealed the extent to which quasi-particles contribute to the bulk properties of metals, which assisted their potential applications in materials science and engineering development
Mechanical and structural properties of termite soil as a partial replacement to cement for different applications
Get PDFThis paper presents the results of the experimental and theoretical study of the mechanical and structural properties of termite soil as a partial replacement to cement for different applications, especially in the building/construction industry. Different volume fractions of termite soil are mixed with Portland cement and their compressive and flexural strengths as well as fracture toughness values are determined. The mechanical properties of the composites are also elucidated after curing the samples for 7 days, 14 days and 28 days. The study shows that the 28 days Compressive strength decreases with increasing volume percentage of termite soil for volume percentages up to 60%. The 28 day strength was also greater than the requirement of (NIS 87: 2000) for non-bearing load walls (δmin=2.8N/mm²› 2.5 N/mm²). The flexural strength for 20% replacement (at all curing days) was greater than 7 N/mm². The fracture toughness was also observed to decrease with increasing volume percentage of termite soil up to 20 vol. %. This resulted in a maximum fracture toughness of 4.24 for the materials with 20 vol. % of termite soil stabilization. The samples are then characterized via X-ray Diffraction (XRD) and Energy Dispersive Spectroscopy (EDX). The implications of the results are discussed for the development of sustainable termite-stabilized building materials
Design of 35kV Box Substation
Get PDFIn China, the current use of box-type substation is widespread, all walks of life are in use, box-type substation, alsoknown as outdoor complete substation, is the high voltage power, transformer buck, low voltage distribution and otherfunctions organically combined, It is suitable for use in economic development zones where the load is concentrated,and it is suitable for the economic development zone, the factory, the factory building, the factory building, the factorybuilding, the factory building, Mines, residential quarters and other urban public facilities, the user can be based ondiff erent conditions of use, load level selection box-type substation
Design of Battery Parameter Analysis Device Based on Labview
Get PDFBased on the design of labview battery parameter analyzer, this problem is a problem worthy of further study. Themain content of this thesis is to use labview software to design a program, through DAQmx will be in the physicaldata (the battery of various parameters, such as: voltage, current, etc.) into the computer, through the already designedprogram to measure various parameters of the battery. My main goal this time is to measure the battery's power.Therefore, I need to measure the actual circuit by the battery voltage changes, current changes, and the time spent bythe software in the program analysis to calculate the battery actually have the power. Not only to calculate the totalpower, but also to calculate the power per minute per second, and through the chart displayed. The biggest feature ofthis topic is the theoretical design is more important, hardware devices and devices is not too complicated, of course,only relatively speaking, so the biggest feature of this topic is that I designed the software program, the main functionis refl ected in the program Among them, the hardware device only played a supporting role
Layered Double Hydroxides/Polymer Nanocomposites
Get PDFLayered double hydroxides ( LDH) are a class of ionic lamellar compounds made up of positivelycharged layered hydroxides w ith an inter layer region containing charge compensating anions. LDH can beintroduced as precursor into polymer matrix to prepare LDH / polymer nanocomposites. The properties of thepolymer matrix can be strengthened as the addition of LDH,and nanocomposites have show n excellentperformances and development potentials in many fields.In this paper,the preparation methods of LDH / polymer nanocomposites are review ed,such as blending ,intercalation,in-situ,exfoliation / adsorption,layer-by -layer( LBL) assembly. Then the applications of the LDH/polymer nanocomposites are also summarized,such asflame retardant,gas barrier,infrared absorption,controlled release,adsorption. Finally ,development trends ofresearch direction and research field of the LDH / polymer nanocomposites are prospected
Synthesis, Structural, Thermal and Luminescence Studies of new DABCO ¬bismuthate (III) hybrid material
Get PDFThe title compound Bis(1,4-diazabicyclo[2.2.2]octane)octachlorido-di-bismuthate (III) dihydrate was obtained by slow evaporation at room temperature of a hydrochloric aqueous solution (pH=1) containing bismuth (III) nitrate and the 1,4-diazabicyclo[2.2.2]octane (DABCO) in a 1:2 molar ratio. This material crystallizes in the P21/c monoclinic space group with a=7.875(1)Å, b=18.380(2)Å, c=10.445(2)Å, β=105.95(1)° and Z=2. The structure exhibits a zero-dimensional (0D) periodic arrangement of bioctahedra (Bi2Cl10)4- surrounded by organic cations 1,4-diazabicyclo[2.2.2]octane (DABCO). The crystal cohesion is achieved by N-H…Cl, N-H…O and O-H…Cl hydrogen interaction linking the different parts of the structure. This compound was characterized by different techniques such as IR, DSC, TGA-DTA, XRD, XPRD and photoluminescence (PL) at room temperature
Enhancement of Durability Properties and Drying Shrinkage of Heat-treated Oil Palm Shell Species High-strength Lightweight Concrete
Get PDFIn this study, the effects of heat-treated and non-treated oil palm shell (OPS) species (dura and tenera) are investigated on the slump, density and compressive strength of oil palm shell concrete (OPSC). Two different species of OPS coarse aggregates are subjected to heat treatment at 65 and 130 °C with the duration of 1 h. The results show that the workability of the OPSC increases significantly with an increase in temperature of heat-treated of the tenera OPS aggregates. It is found that the maximum achievable 28-days and 180-days compressive strength is 51 and 54 MPa, respectively. Furthermore, rapid chloride penetration tests (RCPT), porosity measurement and water absorption tests were performance to signify the effects of heat treatment on different OPS species lightweight concrete (LWC). The use of heat-treated OPS LWC induced the advantageous of reducing the permeability and capillary porosity as well as water absorption. The results showed that the ideal of heat treatment method has enhanced the performance of drying shrinkage. Hence, the findings of this study are of primary importance as they revealed that the heat treatment on OPS species LWC can be used as a new environmentally friendly method to enhance the durability properties and drying shrinkage of OPS LWC
Analysis of Automobile Data Flow
Get PDFThe trend of automobile development is safety, energy saving and environmental protection. Due to the developmentand application of new technologies such as electronic technology, computer technology and information technology,the electronic control of automobile has made great progress in the control precision, scope, adaptability andintelligence and realized the fully optimized operation of the automobile. Therefore, in the reduction of emissions,reduce fuel consumption, improve safety and comfort and many other aspects of electronic control technology hasobvious advantages. This is bound to require a large number of sensors in the car. These miniature sensors are smallenough to enable a wide range of new features, high-volume and high-precision production, low cost and easy to formlarge-scale and multi-function arrays that make them ideal for automotive applications
Phylogeny of Human Mitochondrial DNA Lineages and Its Applications
Get PDFWith the special intention to introduce the most widely adopted phylogenetic analysis human mitochondrial DNA (mtDNA) studi,the history of the reconstruction of mt DNA phylogny was reviewed. And the applications of human mtDNA phylogeny in studying human evolution, estimating the quality of mtDNA data, and distilling the disease-associated mtDNA mutation were then summarized in the present review
Convergent platform for multi-agent data processing in the “Smart Road” system
Get PDFIn the article, the multi-agent platform for convergent sensor data processing in a monitoring system for Smart Road Infrastructure are considered. The platform works with a network of spatially distributed photo-radar complexes, which in real time record road accidents. The paper discusses tools for collection of road accident’s photo and video data fixation, data mining and forecasting of transport incidents, depending on various factors (meteorological, social, operational, etc.). The results of monitoring and analysis of traffic accidents, fixed by an intelligent monitoring system with photo-radar complexes are considered. The connection between the complexes and the data processing center using a heterogeneous wireless network is established. A multi-agent approach developed to address the tasks of sensor data collecting and processing. Convergent approach is the convergence of cloud, fog and mobile data processing technologies. The structure of the neural network is adapted to the diagnosing problems and forecasting. The tasks of intellectual analysis and forecasting traffic accidents solved. The hybrid fuzzy neural network synthesized. Because the comparison of time series of traffic accidents and time series of meteorological factors, it established that the presence of factors to become determinants for an abnormal change in the traffic situation in controlled areas. The monitoring system is a part of Smart Road Infrastructure within the framework of the Smart & Safe City concept