Analysis of Current State and Prospects for Development of Methods for Monitoring Tension of Radio-Reflecting Mesh on Deployable Frame of Large Mirror Antenna

2021 ◽  
pp. 41-55
Author(s):  
S.N. Sayapin
Keyword(s):  
Optical Methods ◽  
Tension Force ◽  
Monitoring Methods ◽  
Automated Control ◽  
Automated Method ◽  
Current State ◽  
Mechanical Methods ◽  
Band Method ◽  
Mirror Antenna ◽  
Relationship Of

The article considers the problems of developing an operating automated method for monitoring the force and uniformity of tension of a radio-reflecting mesh on the deployable frame of large mirror antennas. Based on the performed analysis of known control methods they are classified as contact mechanical methods and non-contact optical ones. It is shown that only optical monitoring methods provide automated control of the tension force of the radio-reflecting mesh on the frame. Among the known optical methods for monitoring, only the moire band method allows creating an immediate picture of the uniformity of the tension of the radio-reflecting mesh over the entire surface under consideration. The method is based on the revealed relationship of moire patterns with the uniformity and tension force of the radio-reflecting mesh. The advantages of the described method are shown; the main advantage is the possibility of installing a radio-reflecting mesh on the deployable frame of the large mirror antenna in real time. Due to its versatility, the proposed method can be used in any other structures where the element being tested is a grid, regardless of the material from which it is made.

scholarly journals Dynamic Manipulation of THz Waves Enabled by Phase-Transition VO2 Thin Film

Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 114
Author(s):  
Chang Lu ◽  
Qingjian Lu ◽  
Min Gao ◽  
Yuan Lin
Keyword(s):  
Optical Methods ◽  
Stimuli Responsive ◽  
Device Structure ◽  
Current State ◽  
Insulator Metal Transition ◽  
Potential Applications ◽  
Fs Laser ◽  
External Stimuli ◽  
Thz Applications ◽  
Thz Waves

The reversible and multi-stimuli responsive insulator-metal transition of VO2, which enables dynamic modulation over the terahertz (THz) regime, has attracted plenty of attention for its potential applications in versatile active THz devices. Moreover, the investigation into the growth mechanism of VO2 films has led to improved film processing, more capable modulation and enhanced device compatibility into diverse THz applications. THz devices with VO2 as the key components exhibit remarkable response to external stimuli, which is not only applicable in THz modulators but also in rewritable optical memories by virtue of the intrinsic hysteresis behaviour of VO2. Depending on the predesigned device structure, the insulator-metal transition (IMT) of VO2 component can be controlled through thermal, electrical or optical methods. Recent research has paid special attention to the ultrafast modulation phenomenon observed in the photoinduced IMT, enabled by an intense femtosecond laser (fs laser) which supports “quasi-simultaneous” IMT within 1 ps. This progress report reviews the current state of the field, focusing on the material nature that gives rise to the modulation-allowed IMT for THz applications. An overview is presented of numerous IMT stimuli approaches with special emphasis on the underlying physical mechanisms. Subsequently, active manipulation of THz waves through pure VO2 film and VO2 hybrid metamaterials is surveyed, highlighting that VO2 can provide active modulation for a wide variety of applications. Finally, the common characteristics and future development directions of VO2-based tuneable THz devices are discussed.

Actinomycetes as the basis of Probiotics for Plants

2021 ◽  
Vol 37 (2) ◽  
pp. 3-19
Author(s):  
A.A. Gagarina
Keyword(s):  
Plant Growth ◽  
Wide Distribution ◽  
Present Review ◽  
Rhizosphere Microorganisms ◽  
Current State ◽  
Close Relationship ◽  
Minimum Requirements ◽  
Stimulate Plant Growth ◽  
Relationship Of ◽  
Streptomyces Genus

The present review describes the concept of probiotics for plants and analyzes the prospects for using actinomycetes as producers of these drugs. The minimum requirements for plant probiotic microorganisms are proposed, similar to those for human probiotic microorganisms. These are utility, efficiency and safety for plants, as well as mandatory isolation from plant samples. It is noted that these requirements are usually met by endophytic and rhizosphere microorganisms that stimulate plant growth and provide them with protection from phytopathogens. Evidence is given for the possibility of attributing actinomycetes to probiotic plant bacteria, due to the close relationship of these microorganisms with plants, their wide distribution in populations of endophytic and rhizosphere microorganisms, and the presence of phytoregulatory activity. The review provides examples of genera and species of actinomycetes that are promising producers of probiotics for agronomically important crops. The most studied and commercialized of them are representatives of the Streptomyces genus. The current state, prospects and problems in commercialization of probiotics based on actinomycetes are discussed. probiotic microorganisms of plants, associative actinomycetes, endophytes, rhizosphere, biological preparations

INTELLIGENT MNEMONIC EDITOR IN ELECTRIFICATION

2020 ◽  
Author(s):  
V.А. Shelest ◽  
◽  
N.I. Ncygulev ◽  
А.P. Sinegubow
Keyword(s):  
Electric Power ◽  
Control Systems ◽  
Preliminary Assessment ◽  
Automated Control ◽  
Current State ◽  
Power Facility ◽  
Control And Management ◽  
Object Of Control

The article deals with the issues of improving the editors of mnemonic diagrams embedded in the programs of automated control systems for electric power facilities. It is proposed to extend the functions of mnemonic circuit editors from the usual modification of the mnemonic circuit in accordance with the reconstruction of the object of control and management to the formation of modified circuit diagrams and wiring diagrams of secondary circuits. In addition, a preliminary assessment was made of the possibility of analyzing the current state of the electric power facility and making recommendations for its management.

scholarly journals Biomechanical behaviours of the bone–implant interface: a review

2019 ◽  
Vol 16 (156) ◽  
pp. 20190259 ◽  
Author(s):  
Xing Gao ◽  
Manon Fraulob ◽  
Guillaume Haïat
Keyword(s):  
Bone Tissue ◽  
Medical Devices ◽  
State Of The Art ◽  
Biomechanical Properties ◽  
Review Article ◽  
Implant Stability ◽  
Bone Implant ◽  
Current State ◽  
Mechanical Methods

In recent decades, cementless implants have been widely used in clinical practice to replace missing organs, to replace damaged or missing bone tissue or to restore joint functionality. However, there remain risks of failure which may have dramatic consequences. The success of an implant depends on its stability, which is determined by the biomechanical properties of the bone–implant interface (BII). The aim of this review article is to provide more insight on the current state of the art concerning the evolution of the biomechanical properties of the BII as a function of the implant's environment. The main characteristics of the BII and the determinants of implant stability are first introduced. Then, the different mechanical methods that have been employed to derive the macroscopic properties of the BII will be described. The experimental multi-modality approaches used to determine the microscopic biomechanical properties of periprosthetic newly formed bone tissue are also reviewed. Eventually, the influence of the implant's properties, in terms of both surface properties and biomaterials, is investigated. A better understanding of the phenomena occurring at the BII will lead to (i) medical devices that help surgeons to determine an implant's stability and (ii) an improvement in the quality of implants.

scholarly journals The association between occupational loading and spine degeneration on imaging – a systematic review and meta-analysis

2019 ◽  
Vol 20 (1) ◽  
Author(s):  
Luciana G. Macedo ◽  
Michele C. Battié
Keyword(s):  
Systematic Review ◽  
Disc Degeneration ◽  
Signal Intensity ◽  
Structural Damage ◽  
Meta Analysis ◽  
Cross Sectional ◽  
Current State ◽  
Disc Bulge ◽  
Spine Degeneration ◽  
Relationship Of

Abstract Background There are inconsistencies in findings regarding the relationship of occupational loading with spinal degeneration or structural damage. Thus, a systematic review was conducted to determine the current state of knowledge on the association of occupational loading and spine degeneration on imaging. Methods We performed electronic searches on MEDLINE, CINAHL and EMBASE. We included cross-sectional, case control and cohort studies evaluating occupational loading as the exposure and lumbar spine structural findings on imaging as the outcomes. When possible, results were pooled. Results Seventeen studies were included in the review. Ten studies evaluated the association of occupational loading with disc degeneration (signal intensity), four of which were pooled into a meta-analysis. Of the 10 studies, only two did not identify a relationship between occupation loading and disc degeneration. A meta-analysis including four of the studies demonstrated an association between higher loading and degeneration for all spinal levels, with odds ratios between 1.6 and 3.3. Seven studies evaluated disc height narrowing and seven evaluate disc bulge, with six and five identifying an association of loading and with imaging findings respectively. Three studies evaluated modic changes and one identified and association with occupational load. Conclusions There was moderate evidence suggesting a modest association between occupational loading and disc degeneration (signal intensity), and low-quality evidence of an association between occupational loading and disc narrowing and bulging.

scholarly journals Sensing Methodologies in Agriculture for Monitoring Biotic Stress in Plants Due to Pathogens and Pests

Inventions ◽  
2021 ◽  
Vol 6 (2) ◽  
pp. 29
Author(s):  
Bhuwan Kashyap ◽  
Ratnesh Kumar
Keyword(s):  
Biotic Stress ◽  
Detection Methods ◽  
Immunological Methods ◽  
Stress Monitoring ◽  
Monitoring Methods ◽  
Future Directions ◽  
Current State ◽  
Output Efficiency ◽  
Acoustic Emission Sensors ◽  
Related Stress

Reducing agricultural losses is an effective way to sustainably increase agricultural output efficiency to meet our present and future needs for food, fiber, fodder, and fuel. Our ever-improving understanding of the ways in which plants respond to stress, biotic and abiotic, has led to the development of innovative sensing technologies for detecting crop stresses/stressors and deploying efficient measures. This article aims to present the current state of the methodologies applied in the field of agriculture towards the detection of biotic stress in crops. Key sensing methodologies for plant pathogen (or phytopathogen), as well as herbivorous insects/pests are presented, where the working principles are described, and key recent works discussed. The detection methods overviewed for phytopathogen-related stress identification include nucleic acid-based methods, immunological methods, imaging-based techniques, spectroscopic methods, phytohormone biosensing methods, monitoring methods for plant volatiles, and active remote sensing technologies. Whereas the pest-related sensing techniques include machine-vision-based methods, pest acoustic-emission sensors, and volatile organic compound-based stress monitoring methods. Additionally, Comparisons have been made between different sensing techniques as well as recently reported works, where the strengths and limitations are identified. Finally, the prospective future directions for monitoring biotic stress in crops are discussed.

Calving Front Machine (CALFIN): Automated Calving Front Dataset and Deep Learning Methodology for East/West Greenland, 1972-2019

2020 ◽  
Author(s):  
Daniel Cheng ◽  
Yara Mohajerani ◽  
Michael Wood ◽  
Eric Larour ◽  
Wayne Hayes ◽  
...  
Keyword(s):  
Deep Learning ◽  
West Greenland ◽  
Automated Method ◽  
Current State ◽  
Time Period ◽  
Current Implementation ◽  
Landsat 7 ◽  
Modis Imagery ◽  
Processing Techniques ◽  
East West

<p>We present Calving Front Machine (CALFIN), an automated method for extracting calving fronts from satellite imagery. We generate results for 66 glaciers along East/West Greenland from 1972 to 2019. We output these results as a dataset, and provide new constraints on glacial evolution over the time period. This method is uniquely robust to clouds, illumination differences, ice mélange, and Landsat-7 Scan Line Corrector errors. The current implementation offers a new opportunity to explore previous trends, and validate existing models moving forward.</p><p>This method utilizes deep learning, in the form of the Google DeeplabV3+ Xception derived CALFIN Neural Network. This approach builds on existing work by Mohajerani et al., Zhang et al., and Baumhoer et al. Additional post-processing techniques allow our method to achieve accurate and useful segmentation of raw images into Shapefile outputs. </p><p>We achieve are often indistinguishable from the manually-curated fronts, deviating from such test data by 1 pixel (about 80 meters) or less XXX% of the time across 162 test images.</p><p>CALFIN excels among the current state of the art. We show this by performing a model inter-comparison to evaluate CALFIN's performance against existing methodologies. We also showcase CALFIN's ability to generalize to SAR and MODIS imagery. We achieve a mean error of 2.25 pixels (86.76 meters) from the true front on a diverse set of 162 testing images.</p>

The 'Ndrangheta: the current state of historical research

Modern Italy ◽  
2011 ◽  
Vol 16 (3) ◽  
pp. 363-383 ◽  
Author(s):  
Fabio Truzzolillo
Keyword(s):  
Local Level ◽  
Organised Crime ◽  
Preliminary Review ◽  
Traditional Values ◽  
Documentary Sources ◽  
Current State ◽  
Community Ties ◽  
Rural World ◽  
Relationship Of ◽  
The Relationship

This article surveys the state of the research undertaken to date on Calabrian organised crime, now known as the 'Ndrangheta. Using continuous reference to the historiography of the Sicilian Mafia, and prompted in particular by a preliminary review of various documentary sources, it also poses questions and develops theories that will need further study and reflection. The first section addresses the classic image of the 'Ndrangheta, as crime linked to the traditional values of the Calabrian rural world. It is suggested that the interweaving of this criminal phenomenon and traditional society is more complex than a relationship of identification between the two, and results from the deliberate pursuit of criminal objectives such as legitimisation and social control. Further problems are highlighted as attention is turned from issues regarding values to the socio-economic features of the ‘Picciotteria’, as the 'Ndrangheta was known prior to the 1950s. There is a discussion of the reasons for its success, the economic parasitism practised using positions of social intermediation, and the existence of formal structures distinct from traditional family bonds and community ties. The article's final section focuses on the relationship between the 'Ndrangheta and politics in the period after the Second World War. The paucity of research that specifically addresses the period between the war and the 1970s is highlighted; linked to this, approaches are suggested for investigating the nature of crime's penetration of politics, the relationship with the parties at the local level, and the ways in which the 'Ndrangheta was interpreted by these same political parties.

scholarly journals PRINCIPLES OF RECONSTRUCTION OF PUBLIC SPACES WITHIN THE BORDERS OF COASTAL TERRITORIES ON THE EXAMPLE OF THE CHERNOMORSKOYE SETTLEMENT IN THE REPUBLIC OF CRIMEA

2021 ◽  
pp. 29-42
Author(s):  
V. V. Sidorova ◽  
V. V. Zhivisa ◽  
А. I. Suvorov ◽  
А. А. Arizer
Keyword(s):  
Urban Development ◽  
Public Spaces ◽  
Coastal Areas ◽  
Current State ◽  
Type Settlement ◽  
History Of ◽  
The Republic ◽  
Relationship Of ◽  
The Relationship ◽  
Planning Problems

The article selects and analyzes scientific literature sources and regulatory documents on the reconstruction of public spaces within the boundaries of coastal territories. It analyzes global experience in the reconstruction of embankments and the modern specifics of urban development of coastal areas in terms of the relationship of coastal areas with urban development. It investigates the architectural and planning problems of embankment spaces and the problems of their reconstruction. It formulates the principles of reconstruction of public spaces of the coastal territories of the locality. It provides practical recommendations for their use. It analyzes the history of the development and current state of the embankment of the urban-type settlement of Chernomorskoye in the Republic of Crimea. It provides proposals and recommendations for the reconstruction of the specified embankment urban-type settlement of Chernomorskoye. On the basis of the conducted research, an experimental design model for the reconstruction of the embankment of urban-type settlement of Chernomorskoye is proposed.

scholarly journals Simulation of the System of Repairs of Apartment Buildings

2019 ◽  
Vol 97 ◽  
pp. 03016
Author(s):  
Serafima Sokova ◽  
Vladimir Kalinin
Keyword(s):  
Housing Stock ◽  
Integrated Approach ◽  
Safe Operation ◽  
Apartment Buildings ◽  
Current State ◽  
The Cost ◽  
Relationship Of ◽  
The Relationship ◽  
Real State

the main issue of the study is the problem of improving the efficiency of the housing sector. The current state system does not ensure the proper efficiency of the housing stock, which is increasingly manifested in the growing gap between the cost of operation of apartment buildings, aimed at ensuring the quality of their functioning and the real state of this quality. In recent years, numerous regulatory documents have been adopted to ensure the normal maintenance of buildings, but a comprehensive understanding of the relationship of various activities with technical and economic solutions, in most cases, has an empirical nature, not confirmed by a strict analytical justification. The purpose of the study is a systematic integrated approach to solving problems to improve the efficiency of maintenance of housing using the proposed mathematical apparatus, which allows you to objectively, fully and accurately assess the relationship of economic and technical indicators. All total socially significant economic indicators of operational measures can be the basis of legislative regulation in the industry. Conclusions: criteria for assessing the effective and safe operation of buildings, optimal for residents of apartment buildings and management companies serving these houses.

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