scholarly journals Modern Aircraft Electronic Power Converters

2019 ◽  
pp. 45-50
Author(s):  
Martin Schrötter ◽  
Martin Matis ◽  
Jakub Leško
Keyword(s):  
Solid State ◽  
Weight Reduction ◽  
Power Converters ◽  
Operational Principle ◽  
Different Types ◽  
Power Inverters ◽  
Electro Magnetic

The article points out to changes in on-board aircraft power converters, which are necessary due to weight reduction and improvement of reliability and maintenance. The paper presents the evolution from old rotary converters to modern solid state converters and describes their advantages. There is also the mention about electro-magnetic interference (EMI), which is introduce during the conversion and how could it be reduced for different types of converters. The operational principle of various power inverters is simulated in MATLAB to figure out different output waveforms quality which could be reached by such a conversion.

scholarly journals CO2 activation through silylimido and silylamido zirconium hydrides supported on N-donor chelating SBA15 surface ligands

2016 ◽  
Vol 52 (12) ◽  
pp. 2577-2580 ◽  
Author(s):  
Farhan Ahmad Pasha ◽  
Anissa Bendjeriou-Sedjerari ◽  
Edy Abou-Hamad ◽  
Kuo-Wei Huang ◽  
Jean-Marie Basset
Keyword(s):  
Density Functional Theory ◽  
Solid State ◽  
Solid State Nmr ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Co2 Activation ◽  
Functional Theory ◽  
Surface Ligands ◽  
Different Types ◽  
Zirconium Hydrides

Density functional theory calculations and 2D 1H–13C HETCOR solid state NMR spectroscopy prove that CO2 can be used to probe, by its own reactivity, different types of N-donor surface ligands on SBA15-supported ZrIV hydrides: [(Si–O–)(Si–N)[Zr]H] and [(Si–NH–)(Si–X–)[Zr]H2] (XO or NH).

scholarly journals ANALYSIS OF STUDENT FORMULA CAR FOR OPTIMUM SAFETY AND PERFORMANCE

2020 ◽  
pp. 137-142
Author(s):  
Rabi Pathak
Keyword(s):  
Boundary Conditions ◽  
Weight Reduction ◽  
Structural Performance ◽  
Complete Analysis ◽  
Loading Conditions ◽  
Different Types ◽  
And Performance ◽  
Reliability Performance ◽  
Ansys Workbench

The Formula Student competitions are held everyyear. This paper is the result of the analysis done on the sample car design that can be presented in the Formula Student competition. The purpose of the paper is to provide a final summary on chassis analysis and structural performance. It also talks about all the important analysis that is to be done on a Formula Student car to make it safe and perform well on the track. The design has been made such that it focusses on maximum adjustability, reliability, performance, safety, weight reduction and ease of manufacturing. The analysis was done to make sure the objectives of design are fulfilled. After going through many papers, documents, blogs and videos we found that many people get confused about the loading conditions and boundary conditions for different types of tests so this paper prioritizes to make people understand about those conditions as well as about the major tests required to perform complete analysis of Formula Student cars. The weight of the chassis was calculated as 36 kg approximately according to the data obtained from design modeler of Ansys workbench as well as Solidworks. The design sustained all the loading conditions and passed all the tests. Thus, one of the objective of this paper is to help other universities and passionate students to successfully design and analyze their cars that can pass all necessary tests included in the paper. KEYWORDS—Formula Student; FEA; Boundary Conditions; Loading Conditions; Ansys; Solidworks

Relationships between the solution and solid-state properties of solution-cast low-k silica thin films

2016 ◽  
Vol 18 (30) ◽  
pp. 20371-20380 ◽  
Author(s):  
Chao-Ching Chiang ◽  
Chien-You Su ◽  
An-Chih Yang ◽  
Ting-Yu Wang ◽  
Wen-Ya Lee ◽  
...  
Keyword(s):  
Thin Films ◽  
Solid State ◽  
Physical Properties ◽  
Amorphous Silica ◽  
Morphological Features ◽  
Silica Thin Films ◽  
Different Types ◽  
Solution Cast ◽  
Low K

This paper reports on the fabrication of low-k (amorphous) silica thin films cast from solutions without and with two different types of surfactants (TWEEN® 80 and Triton™ X-100) to elucidate the relationships between the structural/morphological features of the casting solutions and the physical properties of the resulting thin films.

Synthesis of Nano-BiFeO3 by Low-heating Temperature Solid State Precursor Method: Using Different Types of Alkali

2014 ◽  
Vol 156 (1) ◽  
pp. 129-136 ◽  
Author(s):  
Jin Li ◽  
Lei Wang ◽  
Jin-Bao Xu ◽  
Liang Bian ◽  
Ai-Min Chang ◽  
...  
Keyword(s):  
Solid State ◽  
Heating Temperature ◽  
Precursor Method ◽  
Different Types

scholarly journals Weight Reduction Prospects of the Vessel’s Hulls and Superstructures by Using Large-size Light-weight FSW Welded Panels

2019 ◽  
pp. 49-52
Author(s):  
Evgeniy Alifirenko ◽  
Evgeniy Shishenin
Keyword(s):  
Weight Reduction ◽  
Light Weight ◽  
Large Size ◽  
Different Types ◽  
Panel Thickness

The analysis was carried out to evaluate the efficiency of weight reduction for the hull and superstructure of different types of vessels by using large-size light-weight FSW welded panels instead of extruded panels "PК0266". It is revealed that the weight reduction can be achieved by both reduction of panel thickness and increase of frame spacing. The most significant effect of weight reduction, i.e. 23 % is achieved by using large-size light-weight FSW welded panel of 2,5 mm thickness and 400 mm frame spacing instead of extruded panels "PК0266".

scholarly journals AN AYURVEDIC REVIEW OF KARNANADA W.S.R. TINNITUS

2021 ◽  
Vol 9 (4) ◽  
pp. 794-798
Author(s):  
Anubha Jain ◽  
Mukesh Kumar Gupta
Keyword(s):  
Hearing Loss ◽  
Body Condition ◽  
Electronic Devices ◽  
Treatment Guideline ◽  
Modern Medicine ◽  
Whole Body ◽  
Tinnitus Patient ◽  
General Body ◽  
Different Types ◽  
Electro Magnetic

Karnanada considered as illness caused due to vitiated VataDosha in which a person hears different types of sound in absence of any relevant external stimulus. Now days, it can be considered as tinnitus, a disease with mul- tifactorial etiology. It may be concerned with unhealthy condition of only ear, ear with head disease, only head disease or may be associated with general body condition. In tinnitus patient got ringing, buzzing or other type of sound in one or both ears which might be constant and inconstant often associated with hearing loss. In Ayurveda it is described as preliminary symptoms of hearing loss, which without treatment or with incomplete or improper treatment will progress towards hearing loss. In present scenario of electronic devices which produces electro- magnetic waves (which are harmful to ear including whole body organs), number of such type of cases are in- creasing frequently worldwide. Causes of tinnitus according to modern medicine is unclear or having multiple etiologies therefore treatment guideline of tinnitus in modern practice is not definite hence prognosis of disease also remains uncertain. But in Ayurveda prognosis and line of treatment of Karnanada is mentioned and we can achieve good and satisfactory result. Keywords: Karnanada, Tinnitus, Ayurveda

scholarly journals Varying experimental conditions to study interactions in the solid state

2014 ◽  
Vol 70 (a1) ◽  
pp. C631-C631
Author(s):  
Elena Boldyreva
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Crystal Structures ◽  
Intermolecular Interactions ◽  
Small Molecule ◽  
Variable Temperature ◽  
Variable Pressure ◽  
Continuous Lattice ◽  
Experimental Conditions ◽  
Different Types

Supramolecular interactions in the solid state attract much attention. Different experimental and computational approaches are used, to predict and to design crystal structures, to predict the properties based on molecular and crystal structures, to range different types of intermolecular interactions. Analysis of the crystal structures at fixed (e.g. ambient) temperature and pressure conditions is most common for experiments, whereas most DFT calculations are limited to 0 K, to minimize computational costs. At the same time, evolution of a crystal structure as a function of experimental conditions can contribute significantly to understanding the structure-forming role and relative energies of different types of intermolecular interactions in the same crystal structure and of similar interactions in a series of different but structurally or chemically related compounds. In the present invited contribution I attempt to illustrate this using several selected examples from my own practice and from the papers published by other research groups. I consider, in particular, the results of variable-temperature and variable-pressure studies of continuous lattice strain and phase transitions in small-molecule organic compounds, the results of variable-temperature and variable-pressure crystallization, the results of comparing the dissolution profiles of mono- and multi-component small-molecule organic crystals. I shall also discuss how variable-temperature and variable-pressure experimental diffraction data can assist in optimizing the calculations aimed at comparing the relative stability of polymorphs and predicting polymorph transitions. The study was supported by Russian Ministry of Science and Education and Russian Academy of Sciences.

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