scholarly journals Use of sound spectral signals analysis to assess the technical condition of mechanical devices

2019 ◽  
Vol 290 ◽  
pp. 01006
Author(s):  
Paweł Maciąg ◽  
Leszek Chałko
Keyword(s):  
Near Field ◽  
Technical Condition ◽  
Sound Emission ◽  
Initial State ◽  
Public Places ◽  
Wide Range ◽  
Recorded Data ◽  
Analysis System ◽  
Mechanical Devices ◽  
Safety Systems

The article presents the results of a part of research conducted by the authors into a wide range of work on automation of public safety systems. Their main purpose is to create, on the basis of sound signals analysis, system of warning against the use of firearms monitored public places not only at the time of shooting, but at the stage of preparing - the firearm reloading process. The range of acoustic measurements presented in the article and their analyzes included variability of sound emission of selected type of firearms depending on the number of operations and thus the degree of wear. Analysis of the recorded data will allow in the future to develop a system enabling not only to determine a type of firearm or tp narrow down the search area of individual specimens, but also to determine the degree of wear in terms of suitability for further use. The results discussed in the article correspond to two states of the same firearm model. The first is the initial state from the manufacturer’s factory after returning 50 control shots, the other after over 20,000 cycles. The used firearm was technically fully efficient, with no need to replace the elements during operation as well as tests. The presented scope of measurements includes spectral analysis of sound in the near field and time analysis of sound emission levels in the successive operation phases of the firearm mechanisms.

scholarly journals Predicting specific impulse distributions for spherical explosives in the extreme near-field using a Gaussian function

2021 ◽  
pp. 204141962199349
Author(s):  
Jordan J Pannell ◽  
George Panoutsos ◽  
Sam B Cooke ◽  
Dan J Pope ◽  
Sam E Rigby
Keyword(s):  
Scaling Laws ◽  
Near Field ◽  
Specific Impulse ◽  
Gaussian Function ◽  
Data Driven ◽  
Blast Load ◽  
Structural Deformation ◽  
Load Prediction ◽  
Validation Data ◽  
Wide Range

Accurate quantification of the blast load arising from detonation of a high explosive has applications in transport security, infrastructure assessment and defence. In order to design efficient and safe protective systems in such aggressive environments, it is of critical importance to understand the magnitude and distribution of loading on a structural component located close to an explosive charge. In particular, peak specific impulse is the primary parameter that governs structural deformation under short-duration loading. Within this so-called extreme near-field region, existing semi-empirical methods are known to be inaccurate, and high-fidelity numerical schemes are generally hampered by a lack of available experimental validation data. As such, the blast protection community is not currently equipped with a satisfactory fast-running tool for load prediction in the near-field. In this article, a validated computational model is used to develop a suite of numerical near-field blast load distributions, which are shown to follow a similar normalised shape. This forms the basis of the data-driven predictive model developed herein: a Gaussian function is fit to the normalised loading distributions, and a power law is used to calculate the magnitude of the curve according to established scaling laws. The predictive method is rigorously assessed against the existing numerical dataset, and is validated against new test models and available experimental data. High levels of agreement are demonstrated throughout, with typical variations of <5% between experiment/model and prediction. The new approach presented in this article allows the analyst to rapidly compute the distribution of specific impulse across the loaded face of a wide range of target sizes and near-field scaled distances and provides a benchmark for data-driven modelling approaches to capture blast loading phenomena in more complex scenarios.

scholarly journals Double moiré localized plasmon structured illumination microscopy

Nanophotonics ◽  
2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Ruslan Röhrich ◽  
A. Femius Koenderink
Keyword(s):  
Near Field ◽  
Super Resolution ◽  
Reconstruction Algorithm ◽  
Structured Illumination ◽  
Structured Illumination Microscopy ◽  
Experimental Realization ◽  
Spatial Frequencies ◽  
Wide Range ◽  
Localized Plasmon ◽  
Plasmonic Grating

AbstractStructured illumination microscopy (SIM) is a well-established fluorescence imaging technique, which can increase spatial resolution by up to a factor of two. This article reports on a new way to extend the capabilities of structured illumination microscopy, by combining ideas from the fields of illumination engineering and nanophotonics. In this technique, plasmonic arrays of hexagonal symmetry are illuminated by two obliquely incident beams originating from a single laser. The resulting interference between the light grating and plasmonic grating creates a wide range of spatial frequencies above the microscope passband, while still preserving the spatial frequencies of regular SIM. To systematically investigate this technique and to contrast it with regular SIM and localized plasmon SIM, we implement a rigorous simulation procedure, which simulates the near-field illumination of the plasmonic grating and uses it in the subsequent forward imaging model. The inverse problem, of obtaining a super-resolution (SR) image from multiple low-resolution images, is solved using a numerical reconstruction algorithm while the obtained resolution is quantitatively assessed. The results point at the possibility of resolution enhancements beyond regular SIM, which rapidly vanishes with the height above the grating. In an initial experimental realization, the existence of the expected spatial frequencies is shown and the performance of compatible reconstruction approaches is compared. Finally, we discuss the obstacles of experimental implementations that would need to be overcome for artifact-free SR imaging.

scholarly journals Apply IOT technology to practice a pandemic prevention body temperature measurement system: A case study of response measures for COVID-19

2021 ◽  
Vol 17 (5) ◽  
pp. 155014772110181
Author(s):  
Wei-Ling Lin ◽  
Chun-Hung Hsieh ◽  
Tung-Shou Chen ◽  
Jeanne Chen ◽  
Jian-Le Lee ◽  
...  
Keyword(s):  
Body Temperature ◽  
Temperature Measurement ◽  
Measurement System ◽  
Disease Surveillance ◽  
Disease Surveillance System ◽  
Temperature Detection ◽  
Wide Range ◽  
Body Temperature Measurement ◽  
Analysis System ◽  
Temperature Measurement System

Today, the most serious threat to global health is the continuous outbreak of respiratory diseases, which is called Coronavirus Disease 2019 (COVID-19). The outbreak of COVID-19 has brought severe challenges to public health and has attracted great attention from the research and medical communities. Most patients infected with COVID-19 will have fever. Therefore, the monitoring of body temperature has become one of the most important basis for pandemic prevention and testing. Among them, the measurement of body temperature is the most direct through the Forehead Thermometer, but the measurement speed is relatively slow. The cost of fast-checking body temperature measurement equipment, such as infrared body temperature detection and face recognition temperature machine, is too high, and it is difficult to build Disease Surveillance System (DSS). To solve the above-mentioned problems, the Intelligent pandemic prevention Temperature Measurement System (ITMS) and Pandemic Prevention situation Analysis System (PPAS) are proposed in this study. ITMS is used to detect body temperature. However, PPAS uses big data analysis techniques to prevent pandemics. In this study, the campus field is used as an example, in which ITMS and PPAS are used. In the research, Proof of Concept (PoC), Proof of Service (PoS), and Proof of Business (PoB) were carried out for the use of ITMS and PPAS in the campus area. From the verification, it can be seen that ITMS and PPAS can be successfully used in campus fields and are widely recognized by users. Through the verification of this research, it can be determined that ITMS and PPAS are indeed feasible and capable of dissemination. The ITMS and PPAS are expected to give full play to their functions during the spread of pandemics. All in all, the results of this research will provide a wide range of applied thinking for people who are committed to the development of science and technology.

Gearbox (China) Ltd.: Will the Company's ERP System Support its Ambitious Growth Strategy?

2004 ◽  
Vol 19 (2) ◽  
pp. 140-148 ◽  
Author(s):  
Kai Reimers
Keyword(s):  
Operations Management ◽  
Emerging Market ◽  
Growth Strategy ◽  
Medium Size ◽  
Cultural Issues ◽  
Erp System ◽  
Organizational Behaviour ◽  
Main Challenge ◽  
Wide Range ◽  
Mechanical Devices

This case describes the experience of a wholly foreign-owned manufacturing company in Tianjin/China regarding the use of its ERP system in its main functional departments, purchasing, production planning, sales/distribution, and finance. The company is part of a group which is a global leader in the manufacturing and distribution of mechanical devices, called gearboxes, that are needed to drive a wide range of facilities such as escalators and baggage conveyor belts in airports. It has entered China in 1995 and the Tianjin manufacturing facility has soon become a hub for the Asian market. The main challenge confronting the management team is to support the breakneck growth rate of this young company. The company's ERP system plays a crucial role in this task. However, it seems that middle managers are frequently hitting an invisible wall when trying to expand the use of the ERP system in order to cope with ever-increasing workloads and coordination tasks. This case serves to illustrate cultural issues implicated in the use of an enterprise wide information system in a medium size company operating in an emerging market economy. In addition, issues of operations management, global management, and organizational behaviour are addressed.

Will Nurses’ Work Still be Valued after the COVID-19 Pandemic?

2021 ◽  
Vol 6 (2) ◽  
Author(s):  
Pasquot L ◽  
◽  
Giorgetta S ◽  
Keyword(s):  
Public Health ◽  
Infection Rate ◽  
Health Sector ◽  
Risk Of Infection ◽  
Initial State ◽  
Public Places ◽  
The Public ◽  
High Infection ◽  
A Minor ◽  
Second Wave

Many are the aspects we should ponder on, after 17 months from the burst of the COVID-19 pandemic, especially as nurses. Due to the numerous cuts to the public health sector in the last decades in Italy, the sanitary emergency has been a great sacrifice for health professionals, as public health was completely unprepared to withstand it. The Italian government reacted to this lack of preparation with exceptionally urgent measures. Although, these measures were implemented long after the initial state of confusion and of inappropriate management, they brought about stability and led to a containment strategy for the spread of the virus across the nation [1]. The reduction in the number of COVID-19 diagnoses was mainly achieved through social distancing. At first this was only required to a small number of communities affected by high infection rates, but was eventually extended to the rest of the country from March 2020 [2]. The national lockdown during the first COVID-19 wave (from March to May 2020), was replaced by regional lockdowns in the second wave (from November 2020). As of now, regional lockdowns are integrated by the vaccine campaign and Green Pass enforcement. In November 2020 the Italian Prime Minister at the time, issued legislative measures to enforce regional lockdowns, limiting nonessential movements, cafes, restaurants and other public places opening hours. This legislation established to classify the national territory in different levels of restriction based on the infection rate: red zones - highest risk of infection, orange zones - medium high risk and yellow zones with a minor risk of infection. A later legislation introduced the white zone for territories with the lowest risk of infection (DPCM-14th January 2021). The infection rate has been important to establish a region’s tier status; however, it is not the defining parameter anymore. A new legislation from July 2021 (n.105 - 23rd July 2021), opted to classify a region’s tier status according to the hospital bed’s occupancy rate for COVID-19 patients in intensive care and other medical areas.

scholarly journals All-Sky Radiance Assimilation of ATMS in HWRF: A Demonstration Study

2018 ◽  
Vol 147 (1) ◽  
pp. 85-106 ◽  
Author(s):  
Ting-Chi Wu ◽  
Milija Zupanski ◽  
Lewis D. Grasso ◽  
Christian D. Kummerow ◽  
Sid-Ahmed Boukabara
Keyword(s):  
Single Case ◽  
Control Variable ◽  
Data Availability ◽  
Advanced Technology ◽  
Radiative Transfer Model ◽  
Transfer Model ◽  
State Variables ◽  
Initial State ◽  
Clear Sky ◽  
Analysis System

Abstract Satellite all-sky radiances from the Advanced Technology Microwave Sounder (ATMS) are assimilated into the Hurricane Weather Research and Forecasting (HWRF) Model using the hybrid Gridpoint Statistical Interpolation analysis system (GSI). To extend the all-sky capability recently developed for global applications to HWRF, some modifications in HWRF and GSI are facilitated. In particular, total condensate is added as a control variable, and six distinct hydrometeor habits are added as state variables in hybrid GSI within HWRF. That is, clear-sky together with cloudy and precipitation-affected satellite pixels are assimilated using the Community Radiative Transfer Model (CRTM) as a forward operator that includes hydrometeor information and Jacobians with respect to hydrometeor variables. A single case study with the 2014 Atlantic storm Hurricane Cristobal is used to demonstrate the methodology of extending the global all-sky capability to HWRF due to ATMS data availability. Two data assimilation experiments are carried out. One experiment uses the operational configuration and assimilates ATMS radiances under the clear-sky condition, and the other experiment uses the modified HWRF system and assimilates ATMS radiances under the all-sky condition with the inclusion of total condensate update and cycling. Observed and synthetic Geostationary Operational Environmental Satellite (GOES)-13 data along with Global Precipitation Measurement Mission (GPM) Microwave Imager (GMI) data from the two experiments are used to show that the experiment with all-sky ATMS radiances assimilation has cloud signatures that are supported by observations. In contrast, there is lack of clouds in the initial state that led to a noticeable lag of cloud development in the experiment that assimilates clear-sky radiances.

scholarly journals A Survey of NFC Sensors Based on Energy Harvesting for IoT Applications

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3746 ◽  
Author(s):  
Antonio Lazaro ◽  
Ramon Villarino ◽  
David Girbau
Keyword(s):  
Energy Harvesting ◽  
Integrated Circuits ◽  
Radio Frequency Identification ◽  
Low Cost ◽  
Near Field ◽  
Wearable Sensors ◽  
Cold Chain ◽  
Iot Applications ◽  
Wide Range ◽  
Frequency Identification

In this article, an overview of recent advances in the field of battery-less near-field communication (NFC) sensors is provided, along with a brief comparison of other short-range radio-frequency identification (RFID) technologies. After reviewing power transfer using NFC, recommendations are made for the practical design of NFC-based tags and NFC readers. A list of commercial NFC integrated circuits with energy-harvesting capabilities is also provided. Finally, a survey of the state of the art in NFC-based sensors is presented, which demonstrates that a wide range of sensors (both chemical and physical) can be used with this technology. Particular interest arose in wearable sensors and cold-chain traceability applications. The availability of low-cost devices and the incorporation of NFC readers into most current mobile phones make NFC technology key to the development of green Internet of Things (IoT) applications.

scholarly journals Seismic Vertical Component Effects on the Pathology of a Historical Structure, Xana, Located in Greece

2021 ◽  
Vol 7 ◽  
Author(s):  
Vasiliki Terzi ◽  
Asimina Athanatopoulou
Keyword(s):  
Seismic Analysis ◽  
Near Field ◽  
Three Dimensional ◽  
Vertical Component ◽  
Element Model ◽  
Material Behavior ◽  
Initial State ◽  
Tensile Cracks ◽  
First Case ◽  
Three Dimensional Finite Element

The present study aims to investigate the effects of the seismic vertical component on the pathology of Xana monument which is a typical caravanserai, constructed circa 1375–1385 and is located in the archeological site of the municipality of Trainapoulis, Greece. The monument’s plan is rectangular and the three-leaf masonry circumferential walls support a hemicylindrical dome constructed by bricks and mortar. The structure consisted of two consecutive parts: one for the travelers and one for the animals. Nowadays, the triangular roof, that covered the structure, and the first part of the monument do not exist. Xana suffers tensile cracks along the interior surface of the dome, a vertical fracture located on the northern wall and vertical tensile cracks located at the openings. A three-dimensional finite element model of the initial state of Xana is constructed. Non-linear material behavior is taken into account as well as soil-structure interaction effects. An adequate number of near-field earthquake events has been used, taking into account that they are related to significant vertical components. The structural seismic analysis is conducted for two cases. The first case refers to the action of the two horizontal-component of ground motions while the second one takes into account the three translational seismic components. The pathology estimation reveals important information concerning the structural effects due to vertical accelerations.

scholarly journals Survey of compliance with the cigarettes and other tobacco products act, 2003 at schools in Mangalore, Dakshina Kannada district, Karnataka

2019 ◽  
Vol 6 (8) ◽  
pp. 3289 ◽  
Author(s):  
Jennifer Mathias ◽  
Pratap Kumar Jena ◽  
Sanjeev Kumar Shah ◽  
Jay Prakash Sah ◽  
Koshish Raj Gautam ◽  
...  
Keyword(s):  
Public Health ◽  
Indirect Evidence ◽  
The Body ◽  
Smoking Ban ◽  
Cross Sectional Survey ◽  
Government Schools ◽  
Cross Sectional ◽  
Public Places ◽  
Tobacco Products ◽  
Wide Range

Background: Tobacco use is a major problem of public health significance as the tobacco smoking causes a wide range of diseases and adverse health impacts that affect nearly every organ of the body. The COTPA, 2003 i.e., the Indian smoke-free legislation “Prohibition of smoking in Public places” which forbids smoking in public places, including educational institutions. The main objective of this study is to assess the compliance of Section 4 and Section 6(b) of cigarettes and other tobacco products act (COTPA), 2003 in schools, to observe compliance of smoking ban at public places, to observe compliance of display of signboards at prominent places, to observe for direct and indirect evidence of smoking and other tobacco products used in school buildings and premises, to study the availability of tobacco products within 100 yards of school premises.Methods: A cross sectional survey in 100 schools in Dakshina Kannada district using compliance guide developed by partners of Bloomberg School of Public health to reduce tobacco use.Results: In 100 schools, 55 were rural area and 45 from urban area, further division shows government/semi-government schools were 44 and Private schools were 56. Section 4 for the presence of signboard, there is an association between the Management wise schools and presence of signboards (p=0.001), for section 6(b) of COTPA, there is an association between this Section and type of management (p=0.004).Conclusions: The schools depending upon the location show varied compliance towards the law. The Section 6(b) shows better compliance than Section 4.This study will help to address the implementation issues of COTPA. 

scholarly journals Travel Time Estimation as a Global Trend in the Analysis of Innovative Transportation Projects

2021 ◽  
Vol 129 ◽  
pp. 11011
Author(s):  
Alexey Romanov ◽  
Maria Lyakina
Keyword(s):  
Travel Time ◽  
Value Added ◽  
Time Estimation ◽  
Economic Effects ◽  
Travel Time Estimation ◽  
Transport Costs ◽  
Time Value ◽  
Transportation Projects ◽  
Wide Range ◽  
Analysis System

Research background: The problem of evaluating the results of innovative transport technologies is extremely important for their implementation and realization. The assessment of possible benefits of innovative transport projects is complicated by a number of circumstances. These include a wide range of arising effects in various forms and the long life cycle of the project, which increases the difficulty of reliably measuring the various costs and results. Thus, it can be argued that outdated approaches and methods for assessing the new transport products hinder the development of innovations. Purpose of the article: to identify directions for assessing the travel time value in the analysis of the transportation projects economic efficiency. Methods: The study was conducted by means of scientific methods such as the comparative analysis, system method, generalization and abstraction. Also, we use the results of expert assessments based on depth-in interviews. Findings & Value added: The article substantiates the necessity of taking into account the incremental benefits for passengers from travel time reduction as the most important aspect of transport projects implementation, ensuring the formation of the whole range of external social and economic effects; The multi-factor dependence of the travel time value for a passenger, which is characterised by its heterogeneity during a journey, has been substantiated. The necessity of assessing changes of travel time values in the general transport costs of passengers has been substantiated, taking into account the several factors that lead to different time values. A visual model of the socio-economic effects formation of the HSR project, caused by changes in the passengers’ total transport costs and increased transport accessibility of the region, is proposed.

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