Fluctuation of Biped Walking Mechanism Based on a New Two-Level Type Half-Rotating Mechanism

2010 ◽  
Vol 139-141 ◽  
pp. 877-880
Author(s):  
Shu Bin Ou ◽  
Zhi Zhen Qiu ◽  
Xiao Yi Wang ◽  
Li Ya Hou
Keyword(s):  
Optimal Design ◽  
Theoretical Analysis ◽  
Simulation Program ◽  
Biped Walking ◽  
Motion Characteristics ◽  
Walking Mechanism ◽  
Relationship Of ◽  
The Relationship

. A new bionic biped walking mechanism (BWM) was put forward in this paper. Simple in construction, easy in control and droved by usual motor are all advantages of this mechanism. But disadvantage should not be ignored. Especially up and down bumpy of the centroid will influence the smoothness of the motion during walk. Through theoretical analysis of kinematics, motion characteristics and the movement of the spindle were obtained in a circle. To aim to bring down the uneven of the BWM, the relationship of all parameters was found and the scope of the fluctuation was established. In the end, all of the results were verified by simulation program of Matlab. The result provided theoretical guidance for optimal design of the mechanism in the further research.

scholarly journals The Paradigm of Speech Ontogenesis as a Methodological Basis of Speech Development

2021 ◽  
Vol 1 (6 (344)) ◽  
pp. 207-223
Author(s):  
Olena Bielova ◽  
Keyword(s):  
Theoretical Analysis ◽  
Speech Development ◽  
School Age ◽  
Scientific Theories ◽  
Mental Processes ◽  
Methodological Basis ◽  
Speech Activity ◽  
Relationship Of ◽  
The Relationship ◽  
Children's Speech

The research provides a theoretical analysis of the problem of studying the ontogenesis of speech from birth to school age. The purpose of the research is to provide a theoretical justification for the ontogenesis of speech as the methodological basis for speech development. Research methods: analysis of scientific sources. Research objectives: theoretical analysis of scientific theories on the knowledge of the terms «language» and «speech»; substantiation of the term «ontogenesis» and terms such as «speech ontogenesis», «children’s speech ontogenesis», «speech development»; study of psycholinguistic concepts of speech ontogenesis; to reveal the phenomenology of the theory of speech activity in the scientific space; coverage, based on scientific theories, of stages of a child’s ontogenetic development from birth to school age; consider scientific teachings on the relationship of speech to other mental processes. Based on scientific and theoretical research, the meaning of the concepts «language» and «speech» was revealed; understanding of the term «ontogenesis» and terms such as «speech ontogenesis», «child speech ontogenesis», «speech development»; the search can help to acquaint with various scientific positions that shed light on the ontogenesis of speech development: nativism (genetic programming of speech development), activity speech theory (speech acquires a kind of activity, motivation, heuristics and it is socially and objectively conditioned) and cognitive development (the relationship of speech with cognitive mental processes); it was described the phenomenology of the theory of speech activity, which includes the leading elements: motive, purpose, tasks, conditions, actions, operations, means of execution; the stages of ontogenesis of children’s speech are revealed (infant, early, preschool and school-age); the close relationship of speech with mental processes are determined. Studying the conceptual foundations of speech ontogenesis will allow us to further understand the problem of speech readiness for the schooling of children with speech pathology.

Oscillatory Fouling in Condensers in Cooling Tower Systems

2019 ◽  
Vol 12 (2) ◽  
Author(s):  
Wei Li
Keyword(s):  
Theoretical Analysis ◽  
Cooling Tower ◽  
Oscillatory Behavior ◽  
Water Velocity ◽  
Experimental Uncertainty ◽  
Physical Mechanisms ◽  
The Mean ◽  
Relationship Of ◽  
The Relationship

Abstract Oscillatory fouling in condensers using cooling tower water was recognized in 1980s, but it had not yet been theoretically analyzed. Without careful theoretical analysis, it is easy to think that oscillatory fouling phenomenon is generated from experimental uncertainty. The new analysis is to split the fouling rate into a mean variable and a fluctuating variable. The mean variable exhibits an asymptotic behavior, and the fluctuating variable exhibits an oscillatory behavior. A theoretical analysis based on the relationship of continuity is used to present fouling oscillatory behavior along the space and time dimensions simultaneously to provide the intuitive understanding in physical mechanisms driving the phenomenon. A series of long-term cooling tower water fouling tests were conducted: fouling data collected in two copper helically ribbed tubes with the same internal and external diameters and different inside geometric parameters at the same water velocity in condenser in practical cooling tower conditions present oscillatory behavior. The frequencies of the fluctuation are the same for the two tested tube geometries. The spatial and the temporal oscillatory fouling behaviors presented in the experimental results are predicted by the theoretical analysis.

Non-Sinusoidal Injection Control Strategy of Z-Source Inverter

2012 ◽  
Vol 591-593 ◽  
pp. 1360-1366
Author(s):  
Yang Zhou ◽  
Xiao Ma
Keyword(s):  
Theoretical Analysis ◽  
Control Strategy ◽  
Voltage Gain ◽  
Switching Loss ◽  
Voltage Stress ◽  
Injection Control ◽  
Boost Control ◽  
Relationship Of ◽  
The Relationship ◽  
Current Ripple

The modulation strategy of injecting non-sinusoidal into reference voltage is presented in this paper. Z-source inductor current ripple and the relationship of voltage gain versus modulation index are analyzed in detail. Compared to simple boost control, the non-sinusoidal injection modulation strategy can obviously decreased the switching times, thus switching loss is cut down, and the voltage stress and Z-source inductor current ripple are obviously reduced. Theoretical analysis, simulation and experimental results are presented to demonstrate the features of the control.

scholarly journals THE LEVEL AND QUALITY OF TRADE SERVICES: THE ESSENCE AND RELATIONSHIP OF CONCEPTS

2021 ◽  
pp. 118-123
Author(s):  
Iryna Boichyk ◽  
Olha Sobko ◽  
Halyna Spyak
Keyword(s):  
Theoretical Analysis ◽  
Key Words ◽  
Service Level ◽  
Competitive Advantages ◽  
Specific Element ◽  
Service Competition ◽  
Relationship Of ◽  
The Relationship

Purpose. The aim of the article is generalization of theoretical provisions on the nature, level and quality of trade services to consumers, identification of the content relationship between them and the role in meeting market demands of the population. Methodology of research. The following research methods were used to achieve this goal: theoretical analysis, abstract and logical – to reveal the essence of trade services, its level and quality; interpretations and comparisons – to determine the relationship and interaction of the concepts of “level” and “quality” of trade services; graphical – to visualize the classification of indicators for assessing the quality of trade services. Findings. It is established that trade service in modern conditions together with quality of the goods offered to consumers is an element of maintenance of competitive advantages of the trading enterprises. This is due to the growing demands of consumers not only to the consumer characteristics of goods, but also related to their sale of trade services. It is substantiated that the concepts of “level of trade service” and “quality of trade service” are not identical concepts. The first of them reflects a set of elements of providing consumers with a variety of services to create a comfortable environment for the purchase of goods and reflects the situation “present or absent” a specific element of trade services. The second is the degree of compliance of the level of trade service with the expectations and needs of consumers, which can be quantified. Originality. The substantiation of the essence, content and correlation of the concepts “the level of trade service” and “quality of trade service”, their influence on the competitiveness of trade enterprises was further developed. Practical value. Substantiated research results can be used by commercial enterprises to assess the effectiveness of their activities in terms of ensuring a higher level and quality of trade services on the basis of these elements and indicators. Key words: trade enterprise, trade service, level of trade service, quality of trade service, competition.

scholarly journals Motion characteristics and related factors of Modic changes in the lumbar spine

2015 ◽  
Vol 22 (5) ◽  
pp. 511-517 ◽  
Author(s):  
Tetsuo Hayashi ◽  
Michael D. Daubs ◽  
Akinobu Suzuki ◽  
Trevor P. Scott ◽  
Kevin H. Phan ◽  
...  
Keyword(s):  
Disc Degeneration ◽  
Translational Motion ◽  
Modic Changes ◽  
Angular Motion ◽  
Segmental Motion ◽  
Disc Disease ◽  
Motion Characteristics ◽  
Relationship Of ◽  
The Relationship

OBJECT Most studies of Modic changes (MCs) have focused on investigating the relationship between MCs and lowback pain, whereas the kinematic characteristics and degenerative disc disease associated with MCs are not well understood. To the authors' knowledge, no previous study has reported on the kinematics of MCs. The purpose of this study was to elucidate the relationship of MCs to segmental motion and degenerative disc disease. METHODS Four hundred fifty symptomatic patients underwent weight-bearing lumbar kinematic MRI in the neutral, flexion, and extension positions. Segmental displacement and intervertebral angles were measured in 3 positions using computer analysis software. Modic changes, disc degeneration, disc bulging, spondylolisthesis, angular motion, and translational motion were recorded, and the relationship of MCs to these factors was analyzed using a logistic regression model. To control the influence of disc degeneration on segmental motion, angular and translational motion were analyzed according to mild and severe disc degeneration stages. The motion characteristics and disc degeneration among types of MCs were also evaluated. RESULTS Multivariate analysis revealed that age, disc degeneration, angular motion, and translational motion were factors significantly related to MCs. In the severe disc degeneration stage, a significant decrease of angular motion and significant increase of translational motion were found in segments with MCs, indicating that a disorder of the endplate had an additional effect on segmental motion. Disc degeneration increased and angular motion decreased significantly and gradually as the type of MC increased. Translational motion was significantly increased with Type 2 MCs. CONCLUSIONS Age, disc degeneration, angular motion, and translational motion were significantly linked to MCs in the lumbar spine. The translational motion of lumbar segments increased with Type 2 MCs, whereas angular motion decreased as the type of MC increased, indicating that Type 2 MCs may have translational instability likely due to degenerative changes. A disorder of the endplates could play an important role in spinal instability.

Optimization of New Metal Gasket Design Based on Contact Width Involving Contact Stress Consideration

2011 ◽  
Vol 110-116 ◽  
pp. 4780-4787
Author(s):  
M. Agus Choiron ◽  
Shigeyuki Haruyama ◽  
K. Kaminishi
Keyword(s):  
Optimal Design ◽  
Taguchi Method ◽  
Optimum Design ◽  
Contact Stress ◽  
Orthogonal Array ◽  
Design Concept ◽  
Parameter Design ◽  
Contact Width ◽  
Relationship Of ◽  
The Relationship

The relationship of contact width and leakage had been found as design concept to optimize new metal gasket. By using this design concept, the limits of contact width for no leakage can be chosen. The optimize gasket shape can be developed by increasing of contact width. In this study, a gasket shape was optimized based on contact width as design concept and involving contact stress consideration. The design of experimentation (DOE) Taguchi method is used to analyses the effect of each parameter design and predict optimal design of new 25A metal gasket. The L18 orthogonal array was concerned to design experimental matrix for seven factors with three levels. The optimum design of gasket at 0 MPa mode is the model with OH = 4 mm, p1 = 3.5 mm, p2 = 4 mm, p3 = 4 mm, t = 1.2 mm, R = 3.5 mm and h = 0.4 mm. The optimum design of gasket at 400 MPa mode is the model with OH = 3 mm, p1 = 3.5 mm, p2 = 4.5 mm, p3 = 4.5 mm, t = 1.8 mm, R = 1.5 mm and h = 0.3 mm.

scholarly journals THE RELATIONSHIP OF ABILITY TO OVERCOME PSYCHOLOGICAL BARRIERS OF EDUCATIONAL ACTIVITIES AND LEVEL OF HARDINESS AMONG STUDENTS

2021 ◽  
pp. 81-89
Author(s):  
Жанна Робертовна Гарданова ◽  
Валерия Алексеевна Манина
Keyword(s):  
Theoretical Analysis ◽  
Coping Behavior ◽  
Educational Activities ◽  
Psychological Barriers ◽  
Psychological Service ◽  
Risk Acceptance ◽  
Two Stages ◽  
Relationship Of ◽  
The Impact ◽  
The Relationship

Приводятся результаты теоретического анализа и экспериментального исследования проблемы взаимосвязи уровня жизнестойкости и способности к преодолению психологических барьеров, возникающих в процессе учебной деятельности у студентов. Проведенный анализ включает в себя работы как отечественных, так и зарубежных исследователей С. Мадди, Д.А. Леонтьева, М.А. Одинцовой и др. Эмпирическое исследование проведено в два этапа, с применением методик оценки уровня жизнестойкости и выраженности психологических барьеров учебной деятельности, выборка исследования составила 60 человек. Статистический анализ показал значимые корреляционные взаимосвязи, которые свидетельствуют о влиянии на способность к преодолению психологических барьеров учебной деятельности таких показателей жизнестойкости, как вовлеченность, контроль, принятие риска и жизнестойкость. Данное исследование позволяет сделать вывод о влиянии уровня жизнестойкости, а также его отдельных показателей на способность студентов к преодолению психологических барьеров учебной деятельности. Результаты исследования могут быть использованы для совершенствования работы психологической службы вузы. Provides results of theoretical analysis and experimental research of the problem of the relationship between the level of resilience and the ability to overcome psychological barriers of educational activities among students. In the theoretical analysis, hardiness is considered within the compass of the study of coping behavior, in particular overcoming psychological barriers of educational activities. The analysis carried out includes the works of both domestic and foreign researchers S. Maddi, D.A. Leontyev, M.A. Odintsova et al. The empirical study of the problem of the relationship between the level of hardiness and the ability to overcome psychological barriers among students was carried out in two stages, using methods for assessing the level of hardiness and the intensity of psychological barriers of educational activities, the study sample consisted of 60 people. Statistical analysis showed significant correlations, which indicate the influence of such indicators of hardiness as involvement, control, risk acceptance and hardiness on the ability to overcome psychological barriers of educational activities among students. This study allows to conclude about the impact of the level of hardiness on the ability of students to overcome psychological barriers. The research results can be used to improve the psychological service of universities.

The Influence of Dimensional Stability on Overfeed Sewing Shrinkage of Wool Fabric

2013 ◽  
Vol 796 ◽  
pp. 593-597
Author(s):  
Tong Hong Xu ◽  
Hong Sun
Keyword(s):  
Theoretical Analysis ◽  
Dimensional Stability ◽  
Wool Fabric ◽  
Apparel Manufacture ◽  
Connection Length ◽  
Relationship Of ◽  
The Relationship ◽  
Analysis Equation ◽  
Shrinkage Characteristic

In order to analyze the influence of dimensional stability on overfeed sewing shrinkage of wool fabric, the paper used theoretical analysis equation to evaluate and overfeed sewing shrinkage of wool-type fabrics and took water shrinkage as index of dimensional stability to analyze its influence on overfeed sewing shrinkage characteristic value such as connection length, fabric connection length ratio. The research revealed the relationship of dimensional stability and overfeed sewing shrinkage, and derived calculation method of oblique shrinkage based on analysis of warp and weft shrinkage. It provided the theory reference on sewing quality of wool fabric in apparel manufacture and use.

Analysis of material motion characteristics of vertical nonlinear synchronous vibration dryer

2019 ◽  
Vol 43 (4) ◽  
pp. 560-568
Author(s):  
Xiaohao Li ◽  
Rui Gao ◽  
Tao Shen
Keyword(s):  
Theoretical Analysis ◽  
Production Efficiency ◽  
Structure Parameters ◽  
Experimental Basis ◽  
Nonlinear Characteristics ◽  
Theoretical Support ◽  
Moving Direction ◽  
Motion Characteristics ◽  
The Relationship ◽  
Analysis Of Motion

The nonlinear characteristics of a vertical dryer prototype under the synchronous excitation of vibration motors were analyzed. The vibration synchronization conditions of the two excitation motors of the vertical dryer were pursued. The analysis of motion characteristics of the material granules on the vertical dryer was conducted. The relationship between the structure parameters of the vertical dryer powered by two excitation motors and the motion characteristics of the material granules were discussed. Experimental results and discussion were used to verify the correctness of the theoretical analysis. This research demonstrated that the displacement of the material granules in the moving direction increased as the installment angle of the two excitation motors increased. This can improve the production efficiency; however, too large an installment angle destabilized the response of the dryer, no longer satisfying the design and use requirements. The research methods and conclusions presented in this paper can provide theoretical support and experimental basis for future development of a vibration dryer powered by two excitation motors.

scholarly journals 5.3. MEANING OF BANK CAPITAL FOR LOAN

2020 ◽  
Author(s):  
Е.А. Посная ◽  
С.В. Тарасенко ◽  
О.И. Дицуленко ◽  
М.И. Казнова
Keyword(s):  
Theoretical Analysis ◽  
Commercial Bank ◽  
Capital Formation ◽  
Practical Significance ◽  
Bank Capital ◽  
Regulatory Documents ◽  
Banking Institutions ◽  
High Level ◽  
Relationship Of ◽  
The Relationship

В исследовании представлены теоретический анализ и практическое значение процесса формирования капитала банка и взаимосвязь этого процесса с кредитованием. Текущий запас капитала банка должен быть достаточным для того, чтобы выдавать кредиты с повышенным уровнем риска. Поэтому банковским учреждениям целесообразно иметь размер капитала выше, чем уровень достаточного, согласно нормативным документам. От стратегически грамотно сформированного капитала банка напрямую зависит получение прибыли, что является основной целью деятельности коммерческого банка. The study presents a theoretical analysis and practical significance of the process of bank capital formation and the relationship of this process with lending. The current capital reserve of banks must be sufficient to issue loans with a high level of risk. Therefore, it is advisable for banking institutions to have an amount of capital higher than the level of sufficient, according to regulatory documents. Profit directly depends on the strategically competently formed capital of the bank, which is the main goal of the commercial bank.

Sign in / Sign up

Export Citation Format

Share Document