scholarly journals Adaptive selective-invariant control of tracking electric drives with elastic kinematic transmissions

Vestnik IGEU ◽  
2021 ◽  
pp. 57-64
Author(s):  
I.A. Tikhomirova ◽  
L.G. Kopylova ◽  
S.V. Tararykin
Keyword(s):  
Tracking Control ◽  
Dynamic Control ◽  
Synthesis Methods ◽  
Parametric Synthesis ◽  
Electromechanical Systems ◽  
Wide Range ◽  
Angular Displacements ◽  
Invariant Control ◽  
Effective Use ◽  
Structural Solutions

Currently, high quality indicators of adaptive versions of selective-invariant electromechanical systems designed to control the speed in a wide range have been obtained. Thus, it lays the groundwork for effective use of the proposed synthesis methods and obtained structural solutions in the systems of contour-positional and tracking control of angular displacements of the working elements of technological machines. The implemented structural-parametric synthesis is based on the methods of the theory of modal control, reduction of regulators, the principles of selective invariance, separation of the rates of movement of local subsystems, adaptive, contour-positional and tracking control. The study has been carried out by detailed computational experiments with models of synthesized electromechanical systems. The features of synthesis and functioning of adaptive selective-invariant systems with elastic kinematic links in the tracking and positioning modes are described. The combination of the principles of tracking, selective-invariant and adaptive control in the structure of a single electromechanical system makes it possible to fully provide new opportunities for the implementation of high-precision dynamic control of working machines.

scholarly journals The aspects of microbial biomass use in the utilization of selected waste from the agro-food industry

2020 ◽  
Vol 15 (1) ◽  
pp. 787-796 ◽  
Author(s):  
Marek Kieliszek ◽  
Kamil Piwowarek ◽  
Anna M. Kot ◽  
Katarzyna Pobiega
Keyword(s):  
Food Industry ◽  
Industrial Applications ◽  
Waste Products ◽  
Yeast Biomass ◽  
Wide Range ◽  
Innovative Solutions ◽  
Biomass Management ◽  
Effective Use ◽  
Modern Technologies ◽  
Biomass Of Microorganisms

AbstractCellular biomass of microorganisms can be effectively used in the treatment of waste from various branches of the agro-food industry. Urbanization processes and economic development, which have been intensifying in recent decades, lead to the degradation of the natural environment. In the first half of the 20th century, problems related to waste management were not as serious and challenging as they are today. The present situation forces the use of modern technologies and the creation of innovative solutions for environmental protection. Waste of industrial origin are difficult to recycle and require a high financial outlay, while the organic waste of animal and plant origins, such as potato wastewater, whey, lignin, and cellulose, is dominant. In this article, we describe the possibilities of using microorganisms for the utilization of various waste products. A solution to reduce the costs of waste disposal is the use of yeast biomass. Management of waste products using yeast biomass has made it possible to generate new metabolites, such as β-glucans, vitamins, carotenoids, and enzymes, which have a wide range of industrial applications. Exploration and discovery of new areas of applications of yeast, fungal, and bacteria cells can lead to an increase in their effective use in many fields of biotechnology.

scholarly journals Wide range continuously tunable and fast thermal switching based on compressible graphene composite foams

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Tingting Du ◽  
Zixin Xiong ◽  
Luis Delgado ◽  
Weizhi Liao ◽  
Joseph Peoples ◽  
...  
Keyword(s):  
Thermal Management ◽  
Dynamic Control ◽  
Operating Conditions ◽  
Dynamic Thermal Management ◽  
Graphene Composite ◽  
Continuous Tuning ◽  
Composite Foams ◽  
Wide Range ◽  
Thermal Switches ◽  
Thermal Switching

AbstractThermal switches have gained intense interest recently for enabling dynamic thermal management of electronic devices and batteries that need to function at dramatically varied ambient or operating conditions. However, current approaches have limitations such as the lack of continuous tunability, low switching ratio, low speed, and not being scalable. Here, a continuously tunable, wide-range, and fast thermal switching approach is proposed and demonstrated using compressible graphene composite foams. Large (~8x) continuous tuning of the thermal resistance is achieved from the uncompressed to the fully compressed state. Environmental chamber experiments show that our variable thermal resistor can precisely stabilize the operating temperature of a heat generating device while the ambient temperature varies continuously by ~10 °C or the heat generation rate varies by a factor of 2.7. This thermal device is promising for dynamic control of operating temperatures in battery thermal management, space conditioning, vehicle thermal comfort, and thermal energy storage.

Solid State Materials Chemistry

2021 ◽  
Author(s):  
Patrick M. Woodward ◽  
Pavel Karen ◽  
John S. O. Evans ◽  
Thomas Vogt
Keyword(s):  
Materials Science ◽  
Specific Property ◽  
Integrated Treatment ◽  
Synthesis Methods ◽  
Materials Chemistry ◽  
Wide Range ◽  
Hands On ◽  
Hands On Learning ◽  
Extended Solids ◽  
Core Concepts

This comprehensive textbook provides a modern, self-contained treatment for upper undergraduate and graduate level students. It emphasizes the links between structure, defects, bonding, and properties throughout, and provides an integrated treatment of a wide range of materials, including crystalline, amorphous, organic and nano- materials. Boxes on synthesis methods, characterization tools, and technological applications distil specific examples and support student understanding of materials and their design. The first six chapters cover the fundamentals of extended solids, while later chapters explore a specific property or class of material, building a coherent framework for students to master core concepts with confidence, and for instructors to easily tailor the coverage to fit their own single semester course. With mathematical details given only where they strengthen understanding, 400 original figures and over 330 problems for hands-on learning, this accessible textbook is ideal for courses in chemistry and materials science.

scholarly journals Formation tracking of multiple amphibious robots with unknown nonlinear dynamics

2020 ◽  
Vol 17 (5) ◽  
pp. 172988142093854
Author(s):  
Di Wu ◽  
Lichao Hao ◽  
Xiujun Xu ◽  
Hongjian Wang ◽  
Jiajia Zhou
Keyword(s):  
Nonlinear Dynamics ◽  
Tracking Control ◽  
Control Algorithm ◽  
Dynamic Control ◽  
Lyapunov Theory ◽  
Kinematic Control ◽  
Formation Tracking ◽  
Control Stage ◽  
Cooperative Tracking ◽  
Unknown Nonlinear Dynamics

Cooperative tracking control problem of multiple water–land amphibious robots is discussed in this article with consideration of unknown nonlinear dynamics. Firstly, the amphibious robot dynamic model is formulated as an uncoupled nonlinear one in horizontal plane through eliminating relatively small sway velocity of the platform. Then cooperative tracking control algorithm is proposed with a two-stage strategy including dynamic control stage and kinematic control stage. In dynamic control stage, adaptive consensus control algorithm is obtained with estimating nonlinear properties of amphibious robots and velocities of the leader by neural network with unreliable communication links which is always the case in underwater applications. After that, kinematic cooperative controller is presented to guarantee formation stability of multiple water–land amphibious robots system in kinematic control stage. As a result, with the implementation of graph theory and Lyapunov theory, the stability of the formation tracking of multiple water–land amphibious robots system is proved with consideration of jointly connected communication graph. At last, simulations are carried out to prove the effectiveness of the proposed approaches.

scholarly journals Colour Studies: Clarification and Alpha-Numeric Adaptation of Notation Systems for Artists and Designers

1970 ◽  
Vol 4 (2) ◽  
pp. 121-148
Author(s):  
ZS Ebigbagha
Keyword(s):  
Subject Matter ◽  
Design Education ◽  
Qualitative Approach ◽  
Pivotal Role ◽  
Art And Design ◽  
Wide Range ◽  
The Subject ◽  
Effective Use ◽  
Creative Construction

Colour studies have generated much confusion in art and design education, particularly among students of the discipline in Nigeria. This is due to the complexity of the subject matter itself, wide-range of available materials and a variety of concepts developed in its multi-disciplinarity that is not kept distinct. Therefore, this paper utilizes a qualitative approach that employs the critical, historical, and analytic examination to provide clarification on the constructive and expressive aspects of colour studies. The paper introduces the reader to the pivotal role of colour and its multi-disciplinary interest. Also, it adequately clarifies paradigms and theories in the physical, psychophysical and psychological domains with particular emphasis on areas of practical value to art and design. Moreover, it considers the numeric adaptation of the colour wheel to a set of numbers for harmonic relationship. And it ends with the need for artists and designers to comprehensively grasp the contextual behaviour of colour and develop colour originality through creative construction and effective use in order to successfully express themselves in colour.

scholarly journals Application of biosynthesized metal nanoparticles in electrochemical sensors

2021 ◽  
pp. 77-77
Author(s):  
Totka Dodevska ◽  
Dobrin Hadzhiev ◽  
Ivan Shterev ◽  
Yanna Lazarova
Keyword(s):  
Green Synthesis ◽  
Metal Nanoparticles ◽  
Electrochemical Sensors ◽  
Dynamic Range ◽  
Limit Of Detection ◽  
Cost Effective ◽  
Electrochemical Sensing ◽  
Synthesis Methods ◽  
Range Limit ◽  
Wide Range

Recently, the development of eco-friendly, cost-effective and reliable methods for synthesis of metal nanoparticles has drawn a considerable attention. The so-called green synthesis, using mild reaction conditions and natural resources as plant extracts and microorganisms, has established as a convenient, sustainable, cheap and environmentally safe approach for synthesis of a wide range of nanomaterials. Over the past decade, biosynthesis is regarded as an important tool for reducing the harmful effects of traditional nanoparticle synthesis methods commonly used in laboratories and industry. This review emphasizes the significance of biosynthesized metal nanoparticles in the field of electrochemical sensing. There is increasing evidence that green synthesis of nanoparticles provides a new direction in designing of cost-effective, highly sensitive and selective electrode-catalysts applicable in food, clinical and environmental analysis. The article is based on 157 references and provided a detailed overview on the main approaches for green synthesis of metal nanoparticles and their applications in designing of electrochemical sensor devices. Important operational characteristics including sensitivity, dynamic range, limit of detection, as well as data on stability and reproducibility of sensors have also been covered. Keywords: biosynthesis; green synthesis; nanomaterials; nanotechnology; modified electrodes

Lyapunov-stable control of mechatronic systems

2005 ◽  
Vol 219 (2) ◽  
pp. 173-185 ◽  
Author(s):  
O Enge ◽  
P Maißer
Keyword(s):  
Inverse Dynamics ◽  
Dynamic Control ◽  
Linear Feedback ◽  
Mechatronic Systems ◽  
Electromechanical Systems ◽  
Starting Point ◽  
Reaction Forces ◽  
The Stability ◽  
Lagrange Formalism ◽  
Stable Control

In this paper, a method for controlling mechatronic systems using inverse dynamics is proposed. The starting point is a unified mathematical approach to modelling electromechanical systems based on Lagrange formalism. This mathematical theory is used to represent such systems taking into account all interactions between their substructures. The concept of Lagrange formalism for electromechanical systems is given and the complete governing equations are presented. The Voronetz equations of a partially kinematically controlled electromechanical system (EMS) are derived. The corresponding reaction forces and voltages following from the Voronetz equations are determined. Using these reactions with small modifications, a so-called ‘augmented proportional-derivative (PD) dynamic control law’ is generated. This controller consists of a non-linear feedforward - based on inverse dynamics - and a linear feedback. The stability of the controller is proved using a Lyapunov function. The controller can also be applied to pure multibody systems or a sheer electrical system, both of which are borderline cases of mechatronic systems.

Functional Contacts With a Range of Splicing Proteins Suggest a Central Role for Brr2p in the Dynamic Control of the Order of Events in Spliceosomes ofSaccharomyces cerevisiae

Genetics ◽  
2001 ◽  
Vol 157 (4) ◽  
pp. 1451-1467 ◽  
Author(s):  
Rob W van Nues ◽  
Jean D Beggs
Keyword(s):  
Protein Interactions ◽  
Dynamic Control ◽  
Splicing Factors ◽  
Functional Protein ◽  
U6 Snrna ◽  
Wide Range ◽  
Snrnp Protein ◽  
Associated Proteins ◽  
Step Factor ◽  
Hybrid Screening

AbstractMapping of functional protein interactions will help in understanding conformational rearrangements that occur within large complexes like spliceosomes. Because the U5 snRNP plays a central role in pre-mRNA splicing, we undertook exhaustive two-hybrid screening with Brr2p, Prp8p, and other U5 snRNP-associated proteins. DExH-box protein Brr2p interacted specifically with five splicing factors: Prp8p, DEAH-box protein Prp16p, U1 snRNP protein Snp1p, second-step factor Slu7p, and U4/U6.U5 tri-snRNP protein Snu66p, which is required for splicing at low temperatures. Co-immunoprecipitation experiments confirmed direct or indirect interactions of Prp16p, Prp8p, Snu66p, and Snp1p with Brr2p and led us to propose that Brr2p mediates the recruitment of Prp16p to the spliceosome. We provide evidence that the prp8-1 allele disrupts an interaction with Brr2p, and we propose that Prp8p modulates U4/U6 snRNA duplex unwinding through another interaction with Brr2p. The interactions of Brr2p with a wide range of proteins suggest a particular function for the C-terminal half, bringing forward the hypothesis that, apart from U4/U6 duplex unwinding, Brr2p promotes other RNA rearrangements, acting synergistically with other spliceosomal proteins, including the structurally related Prp2p and Prp16p. Overall, these protein interaction studies shed light on how splicing factors regulate the order of events in the large spliceosome complex.

Adapting Chatterbots’ Interaction for Use in Children’s Education

2014 ◽  
pp. 413-428
Author(s):  
Antonio F. L. Jacob ◽  
Eulália C. da Mata ◽  
Ádamo L. Santana ◽  
Carlos R. L. Francês ◽  
João C. W. A. Costa ◽  
...  
Keyword(s):  
Knowledge Base ◽  
Affective Computing ◽  
Traditional Methods ◽  
Children's Education ◽  
Computing Model ◽  
Wide Range ◽  
Children’S Education ◽  
Effective Use ◽  
The Web

The Web is providing greater freedom for users to create and obtain information in a more dynamic and appropriate way. One means of obtaining information on this platform, which complements or replaces other forms, is the use of conversation robots or Chatterbots. Several factors must be taken into account for the effective use of this technology; the first of which is the need to employ a team of professionals from various fields to build the knowledge base of the system and be provided with a wide range of responses, i.e. interactions. It is a multidisciplinary task to ensure that the use of this system can be targeted to children. In this context, this chapter carries out a study of the technology of Chatterbots and shows some of the changes that have been implemented for the effective use of this technology for children. It also highlights the need for a shift away from traditional methods of interaction so that an affective computing model can be implemented.

A Collaborative Active Learning Model as a Vehicle for Online Team Learning in Higher Education

2018 ◽  
pp. 40-59 ◽  
Author(s):  
Soo Jeoung Han ◽  
Doo Hun Lim ◽  
Eulho Jung
Keyword(s):  
Higher Education ◽  
Active Learning ◽  
Team Learning ◽  
Online Courses ◽  
Learning Model ◽  
Team Members ◽  
Wide Range ◽  
Online Setting ◽  
Successful Team ◽  
Effective Use

As more higher education faculty use team-based assignments in online courses across a wide range of university disciplines, research on team learning as one of the pedagogical approaches in higher education has become more relevant. The authors reviewed active learning as a type of instructional method for team members' satisfaction and active engagement in their learning processes. Therefore, this chapter explores team learning as an effective online learning model that also facilitates effective use of learning management systems (LMS). Additionally, the chapter examines essential strategies to work and learn as a successful team in an online setting. With the intent of supporting faculty and practitioners of higher education who adopt an online team learning method, the authors propose an active learning model for online team learning and specific guidelines to utilize the model.

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