A Vortex Jet Device Applied in the Development of Active Hydro-Pneumatic Dampers Used in Rehabilitation Equipment

Shock Absorbers ◽

Damping Control ◽

Working Environments ◽

Valve Assembly ◽

The paper overviews and analyses the current status of the development and research of active hydro-pneumatic dampers, which are used in rehabilitation equipment, where vortex jet devices can be applied as control valves. The study focuses on a vortex jet device whose distinctive feature is the absence of mechanically moving parts, describes the principle of its operation, and gives the rationale for using it in the active hydro-pneumatic damper of the knee module prosthesis. From a review of scientific and technical literature, a conclusion is drawn that active hydro-pneumatic dampers are used not only in rehabilitation equipment but also in vehicle shock absorbers. The experience gained in the design and development of active hydro-pneumatic dampers for vehicle shock absorbers was applied in the design and development of an active hydro-pneumatic damper for the knee module. In order to identify the advantages and disadvantages, we examined some designs of active hydro-pneumatic dampers for vehicle shock absorbers. Analysis of technical solutions showed the advantage of vortex jet devices, e.g. high reliability, the ability to work with various working environments, low manufacturing and operating costs; enabled us to recommend a vortex jet device to be used as an actuator, i.e., a vortex valve, in the valve assembly of an active hydro-pneumatic damper. The use of a vortex jet device increases the reliability of the structure and reduces the energy consumption for the control of the structure. The proposed design of the hydro-pneumatic damper allows the use of interactive damping control. The study is the first to introduce the concept and describe the principle of operation of an active hydro-pneumatic damper using a vortex jet device

Naukovy Visnyk of South Ukrainian National Pedagogical University named after K D Ushynsky Linguistic Sciences ◽

Grammatical Difficulties of Automatic Translation of Scientific and Technical Literature

10.24195/2616-5317-2018-27-16 ◽

2019 ◽

Vol 26 (27) ◽

pp. 134-141

Author(s):

Aliona Kolesnichenko ◽

Natalya Zhmayeva

Keyword(s):

Key Words ◽

Technical Literature ◽

Automatic Translation ◽

Grammatical Errors ◽

Translation Service

The article is devoted to the analysis of grammatical difficulties encountered in the process of automatic translation. The paper discusses the advantages and disadvantages of the SDL Trados automatic translation service. The types of grammatical errors when translating scientific and technical texts in SDL Trados are classified, the ways of overcoming them are outlined. Key words: scientific and technical literature, automatic translation, grammatical difficulties.

Technical solutions of vibration safety cold riveting performed ship repair

10.36652/0202-3350-2020-21-3-172-179 ◽

2020 ◽

pp. 172-179

Author(s):

A.Ya. Rozinov

Keyword(s):

Aluminum Alloy ◽

Cold Shock ◽

Vibration Disease ◽

Shock Absorbers ◽

Heating And Cooling ◽

The Press ◽

Press Equipment ◽

Technical Solutions ◽

Ship Repair ◽

Reverse Methods

The parameters of heating and cooling of rivets made of steel and aluminum alloy, as well as data of fi lling holes with these rivets during hot and cold riveting are compared. The features of the process of performing cold impact riveting by direct and reverse methods, as well as the possibility of reducing the force of this riveting by improving the closing heads and constructive transformation of the rivets themselves are considered. Features of physiological infl uence of cold shock riveting on hands, elbows and shoulders of workers are determined. Describes the construction of riveting hammers and supports with spring shock absorbers that prevent the disease of workers vibration disease, portable riveting presses of pneumatic and hydraulic action. A description of the press equipment and technology of bolt-riveting connections, allowing mechanizing the process of cold riveting is given.

METHODS FOR RESTORING WOLVES OF ROLLING PRODUCTION

Tekhnicheskiy servis mashin ◽

10.22314/2618-8287-2020-58-4-114-122 ◽

2020 ◽

Vol 4 (141) ◽

pp. 114-122

Author(s):

DAR’YA LEBEDEVA ◽

◽

ANNA KARPUNICHEVA

Keyword(s):

Thermal Effects ◽

Machine Building ◽

Research Purpose ◽

Technical Literature ◽

Production Methods ◽

Rolling Production ◽

Machine Parts ◽

The Stability ◽

High Degree

Large forces and significant thermal effects are created on the rolls when rolling sheets. The higher the stability of the rolls, the less downtime during their rerolling and higher productivity. (Research purpose) The research purpose is in analyzing the ways of restoring rolls and choose the most appropriate method for restoring these parts. (Materials and methods) The article presents the analysis of the scientific and technical literature on the topic of rolling production, methods for restoring large-sized machine parts of machine-building and metallurgical industries that work in difficult conditions and are subject to a high degree of wear. Authors try to solve the problem by means of comparative and logical analysis based on theoretical and empirical methods of scientific research. (Results and discussion) The article presents two groups of methods for restoring rolled rolls: banding and surfacing the working layer of the roll. Authors have analyzed each method in terms of technology, equipment, and feasibility. The article presents the advantages and disadvantages of the methods under consideration. (Conclusions) The most acceptable way to restore parts with a high degree of wear is surfacing. It is most efficient to apply submerged surfacing using an additional hot additive. Such surfacing, despite some complication of the equipment design, allows to deposit the metal on the roll with low heat input and in most cases in one pass. Surfacing using an additional hot additive allows to increase the productivity of the process by up to 250 percent while reducing the penetration depth by 2-3 times and saving energy by up to 40 percent.

Machine Learning Quantitation of Cardiovascular and Cerebrovascular Disease: A Systematic Review of Clinical Applications

Diagnostics ◽

10.3390/diagnostics11030551 ◽

2021 ◽

Vol 11 (3) ◽

pp. 551

Author(s):

Chris Boyd ◽

Greg Brown ◽

Timothy Kleinig ◽

Joseph Dawson ◽

Mark D. McDonnell ◽

...

Keyword(s):

Machine Learning ◽

Coronary Artery Disease ◽

Coronary Artery ◽

Model Comparison ◽

Disease Risk ◽

Imaging Modalities ◽

Current Status ◽

Body Regions ◽

Artery Disease

Research into machine learning (ML) for clinical vascular analysis, such as those useful for stroke and coronary artery disease, varies greatly between imaging modalities and vascular regions. Limited accessibility to large diverse patient imaging datasets, as well as a lack of transparency in specific methods, are obstacles to further development. This paper reviews the current status of quantitative vascular ML, identifying advantages and disadvantages common to all imaging modalities. Literature from the past 8 years was systematically collected from MEDLINE® and Scopus database searches in January 2021. Papers satisfying all search criteria, including a minimum of 50 patients, were further analysed and extracted of relevant data, for a total of 47 publications. Current ML image segmentation, disease risk prediction, and pathology quantitation methods have shown sensitivities and specificities over 70%, compared to expert manual analysis or invasive quantitation. Despite this, inconsistencies in methodology and the reporting of results have prevented inter-model comparison, impeding the identification of approaches with the greatest potential. The clinical potential of this technology has been well demonstrated in Computed Tomography of coronary artery disease, but remains practically limited in other modalities and body regions, particularly due to a lack of routine invasive reference measurements and patient datasets.

Second Paper: Failure-Survival Automatic Flight Control Systems for Aircraft with Particular Reference to a High Reliability Electrohydraulic Actuator

Proceedings of the Institution of Mechanical Engineers ◽

10.1243/pime_proc_1965_180_022_02 ◽

1965 ◽

Vol 180 (1) ◽

pp. 246-259

Author(s):

R. Ruggles

Keyword(s):

Control System ◽

Control Systems ◽

Flight Control ◽

High Reliability ◽

Supply System ◽

Design Criteria ◽

Flight Control System ◽

System Configurations ◽

Very High

The author discusses some of the problems of failure-survival automatic flight control systems and suggests some basic ground rules as design criteria. The advantages and disadvantages of some of the main types of system are discussed: duplex, triplex, triple component, duplicate-monitored and quadruplex systems being covered. In particular, a quadruplex actuator is described which has been designed and developed mainly for automatic flight control system applications where a very high degrees of failure-survival capability is required. A detailed failure analysis of the various systems is carried out and the importance of the electrical and hydraulic supply system configurations and failure rates is brought out.

MicroRNA annotation in plants: current status and challenges

Briefings in Bioinformatics ◽

10.1093/bib/bbab075 ◽

2021 ◽

Author(s):

Yongxin Zhao ◽

Zheng Kuang ◽

Ying Wang ◽

Lei Li ◽

Xiaozeng Yang

Keyword(s):

Small Rna ◽

Signal To Noise Ratio ◽

Current Status ◽

Mirna Biogenesis ◽

Plant Mirnas ◽

Signal To Noise ◽

Plant Mirna ◽

History Of ◽

Mirna Biogenesis Pathway

Abstract Last two decades, the studies on microRNAs (miRNAs) and the numbers of annotated miRNAs in plants and animals have surged. Herein, we reviewed the current progress and challenges of miRNA annotation in plants. Via the comparison of plant and animal miRNAs, we pinpointed out the difficulties on plant miRNA annotation and proposed potential solutions. In terms of recalling the history of methods and criteria in plant miRNA annotation, we detailed how the major progresses made and evolved. By collecting and categorizing bioinformatics tools for plant miRNA annotation, we surveyed their advantages and disadvantages, especially for ones with the principle of mimicking the miRNA biogenesis pathway by parsing deeply sequenced small RNA (sRNA) libraries. In addition, we summarized all available databases hosting plant miRNAs, and posted the potential optimization solutions such as how to increase the signal-to-noise ratio (SNR) in these databases. Finally, we discussed the challenges and perspectives of plant miRNA annotations, and indicated the possibilities offered by an all-in-one tool and platform according to the integration of artificial intelligence.

Investigation of Borosilicate Glasses with Simulated HLW Components and Determination of Their Chemical Durability

Chimica Techno Acta ◽

10.15826/chimtech.2021.8.1.05 ◽

2021 ◽

Vol 8 (1) ◽

pp. 20218105

Author(s):

S. M. Shaydullin ◽

E. A. Belanova ◽

P. V. Kozlov ◽

M. B. Remizov ◽

E. M. Dvoryanchikova

Keyword(s):

Chemical Durability ◽

Current Status ◽

Borosilicate Glasses ◽

Radiochemical Plant ◽

The paper discusses the current status of the HLW vitrification technology applied at the radiochemical plant of the Mayak PA. Conceptual and technical solutions proposed to develop the technology of vitrification of various types of liquid HLW at the Mayak PA are presented. Compositions of borosilicate glasses with HLW components are described, temperatures of their melting and easy pouring are determined. Chemical durability parameters obtained for the borosilicate glasses are provided.

Designs of new operating copper processing plants: process types, equipment selection, industry trends

Obogashchenie Rud ◽

10.17580/or.2021.01.08 ◽

2021 ◽

pp. 44-52

Author(s):

V. F. Baranov

Keyword(s):

Large Scale ◽

High Capacity ◽

Process Intensification ◽

Processing Plant ◽

Sulphide Ores ◽

Flotation Cells ◽

Ore Preparation ◽

Processing Plants ◽

The article describes the largest operating processing plants for lowgrade copper sulphide ores of our time: 10 plants using the semi-autogenous grinding (SAG) technology and 10 plants using high-pressure grinding rolls (HPGR), with the output of 18 to 100 Mtpa. The unfavorable natural and economic factors are balanced by improved ore preparation and concentration technologies and high-capacity equipment units, combined with cost-saving layout solutions. The ore preparation sector is currently divided between the competing technologies of semi-autogenous grinding and HPGR. The article contains an overview of their advantages and disadvantages. The world’s largest monosection with the capacity of 55.5 Mtpa, that uses the SAG technology, is described. The role of the Drop Weght Test JKSimMet (A×b) parameter in the selection of the ore preparation method and the trend for using HPGR in the processing of strong ores are shown. Examples are provided for the consequences of an inadequate assessment of the feed strength in SAG-based plant designs. Examples of ore preparation process intensification through the use of HPGR in semi-autogenous grinding circuits are also given. The volume of impeller flotation cells installed has reached 600 m3. An overview of the two largest processing plants of our time with the output of 88 and 100 Mtpa of ore is presented. The innovative technical solutions of a newest low-capacity copper plant are highlighted. Based on the results of the overview, a future processing plant is predicted to use ∅12.8–13 m SAG mills, HPGRs with the roll diameter of 3 m, vertical VTM-7000 mills in ore grinding cycles, large fine screens, large-scale impeller flotation cells, and staged SFR and DFR flotation reactors.

Current Problems Analysis and Solving Approaches for Chinese Undergraduate Practice Innovative Talents Training

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.121-126.1972 ◽

2011 ◽

Vol 121-126 ◽

pp. 1972-1976

Author(s):

Jian Li Dong ◽

Wen Bin Hu ◽

Ming Liang Hou

Keyword(s):

Education System ◽

Undergraduate Education ◽

Teaching Experience ◽

Development Strategies ◽

Current Status ◽

Training Process ◽

Education Development ◽

Practical Teaching

According to the current status of Chinese undergraduate education development and practical innovative talent training, the advantages and disadvantages of undergraduate Innovative talents training modes and exam-oriented education system in China’s colleges are analyzed and represented. And then, the problems faced and solved in the practical innovative talents training process are also discussed. Finally, the paper proposes some solving approaches and development strategies for training and improving Chinese undergraduate practical innovative abilities. These approaches and strategies are extracted from practical teaching experience and have important reference role for the undergraduate education.

Indicators to Assist in Addressing Equity through Policy Adoption

Teachers College Record ◽

10.1177/016146812012201411 ◽

2020 ◽

Vol 122 (14) ◽

pp. 1-32

Author(s):

Faith Connolly ◽

Tracey L. Durant ◽

Rachel E. Durham

Keyword(s):

Leadership Skills ◽

Organizational Readiness ◽

Cultural Literacy ◽

Current Status ◽

Racial Equity ◽

Leadership Skill ◽

New Ideas ◽

Organizational Work ◽

Equity Policy ◽

Background/Context The introduction of a racial equity policy provided an opportunity for one school district to examine its systems. The policy addressed structural inequity, as well as cultural literacy issues, internal personal biases, and other power dynamic differences in a historically impacted city. Researchers from a local research-practice policy partnered with the district Director of Equity to support the implementation of a racial equity policy that could be informed by data and research. Purpose/Objective The purpose of this study was to investigate if early warning indicators, specifically indicators of organizational readiness and a Director's leadership skills, could guide the implementation of a racial equity policy. Research Design The study explored using two instruments adapted from Adaptive Leadership to provide iterative feedback on the implementation of a new, challenging policy. Through development of an interview protocol that included potential leading indicators as well as qualitative prompts focused on readiness challenges and successes, the research team and Director met every three weeks to generate data and reflect on preliminary themes. Findings/Results The team found that the indicators of organizational readiness and leadership skill were helpful in informing on the current status and developing new ideas and scenarios to ease implementation of the policy. The qualitative data yielded themes highlighting critical tensions and focus areas essential for practitioners to consider when implementing a racial equity policy. Conclusions/Recommendations The primary implication of the study is that leaders and researchers need to focus on systems-level organizational work and the development of leadership skills. Leaders must anticipate district and school staff defaulting to technical rather than adaptive solutions, especially when addressing the goal of equity. While technical solutions are expedient and comfortable, they will not lead to true or continuous improvement. Moreover, the professional development work required is not singular or temporary, but rather embedded work, likely over many years. Also critical is team learning through authentic conversations making space for individuals’ lived experiences. A final step for developing systems-thinking is iteratively defining the metrics each office and school should be using to support this work formatively. As districts engage in such efforts, a focus on proximal, process-based measures will be more immediately helpful, particularly measures for staff, and not necessarily student data.