scholarly journals Intrahepatic stones

2021 ◽  
Vol 22 (9) ◽  
pp. 1026-1032
Author(s):  
M. A. Chalusov
Keyword(s):  
Practical Importance ◽  
Intrahepatic Stones

The question of intrahepatic stones is rather poorly covered in the literature, but meanwhile it has both theoretical and, in part, of no small practical importance.

Practical Importance of Spatial Resolution and Analytical Sensitivity in AEM X-ray Microanalysis

1990 ◽  
Vol 48 (2) ◽  
pp. 432-433
Author(s):  
J. Zhang ◽  
D.B. Williams ◽  
J.I. Goldstein
Keyword(s):  
Spatial Resolution ◽  
Practical Importance ◽  
Beam Current ◽  
Specimen Thickness ◽  
Analytical Sensitivity ◽  
Related Factors ◽  
X Ray ◽  
Probe Size ◽  
Excitation Volume ◽  
Two Parameters

Analytical sensitivity and spatial resolution are important and closely related factors in x-ray microanalysis using the AEM. Analytical sensitivity is the ability to distinguish, for a given element under given conditions, between two concentrations that are nearly equal. The analytical sensitivity is directly related to the number of x-ray counts collected and, therefore, to the probe current, specimen thickness and counting time. The spatial resolution in AEM analysis is determined by the probe size and beam broadening in the specimen. A finer probe and a thinner specimen give a higher spatial resolution. However, the resulting lower beam current and smaller X-ray excitation volume degrade analytical sensitivity. A compromise must be made between high spatial resolution and an acceptable analytical sensitivity. In this paper, we show the necessity of evaluating these two parameters in order to determine the low temperature Fe-Ni phase diagram.A Phillips EM400T AEM with an EDAX/TN2000 EDS/MCA system and a VG HB501 FEG STEM with a LINK AN10 EDS/MCA system were used.

Contrasts of planar defects in reflection electron microscopy

1993 ◽  
Vol 51 ◽  
pp. 1004-1005
Author(s):  
Feng Tsai ◽  
J. M. Cowley
Keyword(s):  
Electron Microscopy ◽  
Surface Defects ◽  
Practical Importance ◽  
Theoretical Treatment ◽  
Crystal Surfaces ◽  
Planar Defects ◽  
Surface Steps ◽  
Surface Reconstructions ◽  
Domain Boundaries ◽  
Reflection Electron Microscopy

Reflection electron microscopy (REM) has been used to study surface defects such as surface steps, dislocations emerging on crystal surfaces, and surface reconstructions. However, only a few REM studies have been reported about the planar defects emerging on surfaces. The interaction of planar defects with surfaces may be of considerable practical importance but so far there seems to be only one relatively simple theoretical treatment of the REM contrast and very little experimental evidence to support its predications. Recently, intersections of both 90° and 180° ferroelectric domain boundaries with BaTiO3 crystal surfaces have been investigated by Tsai and Cowley with REM.The REM observations of several planar defects, such as stacking faults and domain boundaries have been continued by the present authors. All REM observations are performed on a JEM-2000FX transmission electron microscope. The sample preparations may be seen somewhere else. In REM, the incident electron beam strikes the surface of a crystal with a small glancing angle.

JUDICIARY AND JUDICIARY OF UKRAINE IN THE CONTEXT OF THE NATIONAL MENTALITY

2019 ◽  
pp. 88-97
Author(s):  
Oleksandr Byrkovych
Keyword(s):  
Scientific Knowledge ◽  
Practical Importance ◽  
Constitutional Court ◽  
State Institutions ◽  
Radical Reform ◽  
Legal Studies ◽  
National Tradition ◽  
Scientific Institutions ◽  
Legal Foundations ◽  
Constitutional Right

Purpose. The purpose of the article is to identify the fundamental values of the Ukrainian people, on the basis of which not only his mentality, but also all national-state institutions, including institutions of justice and justice, as well as to identify trends of influence of these values on the further development of legal foundations of the judiciary and justice of Ukraine. Method. The methodological basis of the study was the combination of principles and methods of scientific knowledge. For the objectivity of the research, a set of general scientific, special-legal, special-historical and philosophical methods of scientific knowledge was used. Results. At the current stage of reforming the institutions of the judiciary and the judiciary, the notion of fair justice, which is formed on the basis of popular national culture, plays an important role. Given the functioning of the modern Constitutional Court of Ukraine, whose representatives are formed by delegation to the Verkhovna Rada of Ukraine, the President of Ukraine, the Cabinet of Ministers of Ukraine and the judiciary, this institution needs radical reform as it has repeatedly made political rather than constitutional decisions. Scientific novelty. Based on the analysis of the national tradition of justice, it is established that the Constitutional Court should be formed by public organizations, which are formed by legal experts. There are several higher scientific institutions in Ukraine which have departments, constitutional law research institutes. Their representatives should delegate the best experts in the constitutional right to competitive selection to fill vacancies in the constitutional court. Practical importance. The results of the study can be used in further historical and legal studies, preparation of special courses.

Features of labor relations in quarantine conditions

2020 ◽  
pp. 52-58
Author(s):  
Lesja Kosmii
Keyword(s):  
Law Enforcement ◽  
Labor Relations ◽  
Practical Importance ◽  
Functional System ◽  
Labor Rights ◽  
Personnel Decisions ◽  
Labor Legislation ◽  
Foreign Countries ◽  
Legislative Framework ◽  
Work Method

Goal. The purpose of this work is to analyze the norms of the current labor legislation regarding the regulation of the relations between the employee and the employer in the introduction of any restrictions and anti-epidemic measures in the conditions of national quarantine and prevention in such conditions of violations of labor rights of employees. It is important that during the course of the COVID-19 coronary pandemic measures, they were not only effective but also violated human rights, including work. Method. The methodology includes a comprehensive analysis and generalization of available scientific and theoretical material, experience of foreign countries and formulation of relevant conclusions and recommendations. During the research the following methods of scientific knowledge were used: terminological, comparative, functional, system-structural, logical-normative. Results. During the research it was found that the Ukrainian legislature, including foreign experience, was able to respond promptly to the quarantine situation by adopting anti-crisis laws, which did not neglect labor legislation. This is understandable, because in connection with the announcement of quarantine in the whole territory of Ukraine, employers had to make personnel decisions, and the current legislative framework did not clearly regulate the issues that arose. Scientific novelty. The study found that the updating of labor legislation in the area of labor relations regulation during the national quarantine period allows the employer to use certain forms of labor organization, in which the basic labor rights and guarantees of employees can be preserved. Practical importance. The results of the study can be used in law-making and law enforcement activities, as well as by employers in regulating labor relations with employees during the quarantine period.

Chemical Dissolution of Intrahepatic Stones in Vitro

1995 ◽  
Vol 33 (6) ◽  
pp. 945
Author(s):  
Young Goo Kim ◽  
Kun Sang Kim ◽  
Jong Beum Lee ◽  
Hyung Jin Shim ◽  
Sang Shin Joo ◽  
...  
Keyword(s):  
Chemical Dissolution ◽  
Intrahepatic Stones

Light-Induced Degradation in Solar Cells with Hydrogenated Amorphous Silicon-Sulfur Active Layers

2002 ◽  
Vol 715 ◽  
Author(s):  
Wei Xu ◽  
P. C. Taylor
Keyword(s):  
Solar Cells ◽  
Practical Importance ◽  
Chemical Vapor ◽  
Photovoltaic Devices ◽  
Sulfur Concentration ◽  
Active Layers ◽  
Conversion Efficiencies ◽  
Hydrogenated Amorphous ◽  
Secondary Ion ◽  
Initial Conversion

AbstractWe have made a series of a-SiSx:H based solar cells, with a pin structure, in a multichamber plasma enhanced chemical vapor deposition (PECVD) system. The sulfur concentration ranges from zero to 5 x 1018 cm-3 as measured by secondary ion mass spectroscopy. The initial conversion efficiencies of cells in this series with sulfur concentrations ≤ 1018 cm-3 are approximately 7%. The time constants for degradation increase with increasing sulfur concentration, but not fast enough to be of practical importance in photovoltaic devices.

Rubber–Road Contact: Comparison of Physics-Based Theory and Indoor Experiments

2016 ◽  
Vol 44 (3) ◽  
pp. 150-173 ◽  
Author(s):  
Mehran Motamedi ◽  
Saied Taheri ◽  
Corina Sandu
Keyword(s):  
Rough Surface ◽  
Practical Importance ◽  
Surface Profile ◽  
Surface Characteristics ◽  
Mechanical Analysis ◽  
Friction Model ◽  
Rubber Friction ◽  
Optical Profilometer ◽  
Viscoelastic Modulus ◽  
Longitudinal Slip

ABSTRACT For tire designers, rubber friction is a topic of pronounced practical importance. Thus, development of a rubber–road contact model is of great interest. In this research, to predict the effectiveness of the tread compound in a tire as it interacts with the pavement, the physics-based multiscale rubber-friction theories developed by B. Persson and M. Klüppel were studied. The strengths of each method were identified and incorporated into a consolidated model that is more comprehensive and proficient than any single, existing, physics-based approach. In the present work, the friction coefficient was estimated for a summer tire tread compound sliding on sandpaper. The inputs to the model were the fractal properties of the rough surface and the dynamic viscoelastic modulus of rubber. The sandpaper-surface profile was measured accurately using an optical profilometer. Two-dimensional parameterization was performed using one-dimensional profile measurements. The tire tread compound was characterized via dynamic mechanical analysis. To validate the friction model, a laboratory-based, rubber-friction test that could measure the friction between a rubber sample and any arbitrary rough surface was designed and built. The apparatus consisted of a turntable, which can have the surface characteristics of choice, and a rubber wheel in contact with the turntable. The wheel speed, as well as the turntable speed, could be controlled precisely to generate the arbitrary values of longitudinal slip at which the dynamic coefficient of friction was measured. The correlation between the simulation and the experimental results was investigated.

High-Frequency Financial Econometrics

2014 ◽  
Author(s):  
Yacine Aït-Sahalia ◽  
Jean Jacod
Keyword(s):  
High Frequency ◽  
Practical Importance ◽  
Financial Econometrics ◽  
Trading Strategies ◽  
Financial Data ◽  
Jump Processes ◽  
High Frequency Trading ◽  
Microstructure Noise ◽  
Econometric Methods ◽  
Mathematical Foundations

High-frequency trading is an algorithm-based computerized trading practice that allows firms to trade stocks in milliseconds. Over the last fifteen years, the use of statistical and econometric methods for analyzing high-frequency financial data has grown exponentially. This growth has been driven by the increasing availability of such data, the technological advancements that make high-frequency trading strategies possible, and the need of practitioners to analyze these data. This comprehensive book introduces readers to these emerging methods and tools of analysis. The book covers the mathematical foundations of stochastic processes, describes the primary characteristics of high-frequency financial data, and presents the asymptotic concepts that their analysis relies on. It also deals with estimation of the volatility portion of the model, including methods that are robust to market microstructure noise, and address estimation and testing questions involving the jump part of the model. As the book demonstrates, the practical importance and relevance of jumps in financial data are universally recognized, but only recently have econometric methods become available to rigorously analyze jump processes. The book approaches high-frequency econometrics with a distinct focus on the financial side of matters while maintaining technical rigor, which makes this book invaluable to researchers and practitioners alike.

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