Spatial Response of Arbitrarily Electroded Piezoelectric Plates by Plane-Wave Decomposition

1980 ◽  
Vol 2 (2) ◽  
pp. 102-121 ◽  
Author(s):  
Behzad Noorbehesht ◽  
Gail Flesher ◽  
Glen Wade
Keyword(s):  
Spatial Distribution ◽  
Practical Interest ◽  
Spatial Response ◽  
Spatial System ◽  
A New Technique ◽  
Acoustic Output ◽  
Wave Decomposition ◽  
And Control ◽  
Spatial Transfer Function ◽  
Piezoelectric Plates

The spatial response of resonant piezoelectric plates used in various acoustic imaging systems is of significant practical interest and is closely related to the resolving ability of these systems. In a certain class of applications, in order to achieve the desired transducing action, the faces of the plate are only partially electroded. There, it is advantageous to be able to predict and control the spatial distribution of the acoustic output from the knowledge of the spatial distribution of the electrodes. A new technique is presented for determining the spatial distribution of the acoustic output of an arbitrarily electroded piezoelectric plate. This technique regards the transducer as a linear spatial system, with the electrode pattern considered as the input and the resulting acoustic particle displacement pattern immediately in front of the transducer in the propagation medium as the output. Once the spatial transfer function or the spatial impulse response of the system is known, the output for any electrode configuration can be found using Fourier techniques. Experimental measurements of the output of several piezoelectric plates due to different electrode patterns compare closely with calculations based on the above theory.

The composition and spatial distribution of scavenging hyperbenthos in the Cape d'Aguilar Marine Reserve, Hong Kong

2011 ◽  
Vol 92 (1) ◽  
pp. 39-47 ◽  
Author(s):  
Brian Morton ◽  
Christine N.W. Lee
Keyword(s):  
Spatial Distribution ◽  
Hong Kong ◽  
Marine Reserve ◽  
Spatial Segregation ◽  
The Other ◽  
Flow Rates ◽  
Baited Traps ◽  
Almost All ◽  
And Control

Baited traps with a 5 mm diameter opening were deployed 9 cm off the seabed in the Cape d'Aguilar Marine Reserve, Hong Kong. In contrast to analogous studies from boreal waters, lysianassoids accounted for 0.5% of the total number of trapped hyperbenthos. Species of Tisbe (Copepoda: Tisbidae), Ceradocus (Gammaridea: Melitidae), Nebalia (Leptostraca: Nebaliacea), unidentified benthic ostracods, Neanthes cricognatha (Polychaeta: Nereidae) and a species of Lepidepecreum (Amphipoda: Lysianassoidea) were caught in a decreasing order of numerical importance. A spatial segregation of trapped fauna was identified between the reserve's shallow Lobster Bay (<–2 m Chart Datum (CD)) and deeper-waters (between –6 and–17 m CD) outside it. Ceradocus sp. monopolized the trapped fauna in the former area, while the other species were caught almost exclusively from the latter. Insignificant Ceradocus sp. catch differences between baited and control traps suggested that they functioned only as ‘habitat traps’ for this species. Almost all other organisms attracted to the bait were hyperbenthic scavengers. Their absence from the shallows might be due to the coarser and lower organic contents of the sediments, also related to faster flow rates here. Finally, we confirm that in subtropical Hong Kong, lysianassid amphipods are not as significant hyperbenthic scavengers as they are in boreal waters.

Surface Contamination Measurement and Control by Nondestructive Techniques

1985 ◽  
Vol 28 (6) ◽  
pp. 30-32
Author(s):  
Arvind Arora
Keyword(s):  
Electron Emission ◽  
Printed Circuit Boards ◽  
Thickness Measurement ◽  
Circuit Boards ◽  
Limited Data ◽  
Disk Lubricant ◽  
Wafer Processing ◽  
A New Technique ◽  
And Control ◽  
Measurement And Control

This paper presents a new technique to measure thin layer contamination on the surface of a material. The technique uses low wavelength ultraviolet irradiation to generate optically stimulated electron emission, also known as photo electron emission, which can be used to evaluate surface cleanliness or surface chemical state. Limited data is presented to show application of this technique to wafer processing, disk lubricant thickness measurement and quality control of printed circuit boards.

scholarly journals Use of Indicator Kriging to Investigate Schistosomiasis in Minas Gerais State, Brazil

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Ricardo J. P. S. Guimarães ◽  
Corina C. Freitas ◽  
Luciano V. Dutra ◽  
Carlos A. Felgueiras ◽  
Sandra C. Drummond ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Information Processing ◽  
Geographic Information Systems ◽  
Disease Transmission ◽  
Processing System ◽  
Minas Gerais ◽  
Indicator Kriging ◽  
Intermediate Hosts ◽  
Minas Gerais State ◽  
And Control

Geographic Information Systems (GISs) are composed of useful tools to map and to model the spatial distribution of events that have geographic importance as schistosomiasis. This paper is a review of the use the indicator kriging, implemented on the Georeferenced Information Processing System (SPRING) to make inferences about the prevalence of schistosomiasis and the presence of the species ofBiomphalaria, intermediate hosts ofSchistosoma mansoni, in areas without this information, in the Minas Gerais State, Brazil. The results were two maps. The first one was a map ofBiomphalariaspecies, and the second was a new map of estimated prevalence of schistosomiasis. The obtained results showed that the indicator kriging can be used to better allocate resources for study and control of schistosomiasis in areas with transmission or the possibility of disease transmission.

scholarly journals LEGAL NATURE OF THE TERM OF PRECIOUS STONES IN FORENSIC EXAMINATION: PROBLEMS AND WAYS FOR THEIR RESOLUTION

2020 ◽  
Vol 22 (2) ◽  
Author(s):  
P. Baranov ◽  
R. Kirin ◽  
S. Shevchenko
Keyword(s):  
Forensic Science ◽  
Practical Interest ◽  
Legal Framework ◽  
Legal Regulation ◽  
Rights Protection ◽  
Forensic Examination ◽  
Legal Nature ◽  
Regulation Of Activity ◽  
And Control ◽  
Precious Stones

The article addresses general issues of applying the regulatory adopted term “precious stones” regarding forensic examination practice in Ukraine, including in the field of subsurface resources management and gemological evaluation of jewelery. It is shown that domestic legal framework requires to introduce a separate law on gemstones circulation taking into account general principles of property valuation and consumer rights protection. The Article Purpose is to formulate an author’s contribution to the analysis of problems connected with disclosure of gemstones legal nature in the field of forensic science and the development of proposals for their possible overcoming. The necessity in special legal regulation of activity on mining, production, use, storage of gemstones and manufactures thereof, forensic examination and control over operations with it, is defined by intensity of its circulation as well as by the character of legal objects: their rarity in nature, high cost, easy falsification, and, consequently, by increased attention from fraudsters and criminals. The current situation demands to adopt corresponding regulatory measures aimed at ensuring valuables economic use, protecting gemstone consumers from fraud, preventing the use of valuables while legalizing acquired illegally funds. According to the authors, the article outlines three components of which legal nature of a stone is formed in forensic science: 1) the meaning content in which the term “precious stones” is used in gemological legislation; 2) criteria which are the basis of gemstones classification; 3) unambiguity and clarity of definitions associated with gemstones in forensic legislation. The term “gemstones” in forensic science has subsidiary meaning, since in this case the stone cost should possess a dominant meaning as an object of forensic gemological analysis. Existing gemological classifications are not of modern scientific and practical interest, as the lack of a gemstone cost indicator makes them declarative in terms of forensic science. Forensic gemological analysis should be guided by the requirements of gemological, forensic and procedural branches of legislation, and precious stones acting as its object should be considered as property (goods) which is characterized by specific signs of a physical, economic and legal nature as well as an identifier.

scholarly journals Spatial Distribution of Medically Important Scorpions in Iran: A Review Article

2020 ◽  
Vol In Press (In Press) ◽  
Author(s):  
Mulood Mohammadi Bavani ◽  
Shahin Saeedi ◽  
Abedin Saghafipour
Keyword(s):  
Public Health ◽  
Spatial Distribution ◽  
New Species ◽  
Review Article ◽  
Scorpion Envenomation ◽  
Distribution Maps ◽  
Control Programs ◽  
And Control ◽  
New Distribution ◽  
Excel File

Context: There are three families and 66 species of scorpions in Iran, some of these species are medically relevant, and their sting has caused public health problems. Thus, identification of the new geographical distribution of scorpions and thee new species in very important. The goal of this study was to identify the distribution maps of Iranian scorpions that are medically important according to the latest information. Evidence Acquisition: This present study included a review of all the articles related to Iranian scorpions published in ISI, PubMed, Scopus, ScienceDirect, and Google Scholar databases during 2008 - 2019, using the relevant MeSH keywords. The data were entered in an Excel file, and spatial distribution maps were prepared. Results: From the review of the related published documents, we found that there are 66 scorpion species in Iran, some scorpion names have been changed and new scorpion species have been added to Iranian scorpion fauna and the spatial distribution of some species has become wider. Conclusions: Considering the new distribution maps and data on Iranian scorpions, for scorpion envenomation treatment and control programs, these variations should be regarded.

scholarly journals Prevalence and spatial distribution characteristics of human echinococcosis in China

2021 ◽  
Vol 15 (12) ◽  
pp. e0009996
Author(s):  
Li-Ying Wang ◽  
Min Qin ◽  
Ze-Hang Liu ◽  
Wei-Ping Wu ◽  
Ning Xiao ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Spatial Autocorrelation ◽  
Prevention And Control ◽  
Disease Prevalence ◽  
Tibet Plateau ◽  
Spatial Clusters ◽  
Autonomous Region ◽  
And Control ◽  
Qinghai Tibet Plateau ◽  
Human Echinococcosis

Background Echinococcosis is a zoonotic parasitic disease caused by larval stages of cestodes belonging to the genus Echinococcus. The infection affects people’s health and safety as well as agropastoral sector. In China, human echinococcosis is a major public health burden, especially in western China. Echinococcosis affects people health as well as agricultural and pastoral economy. Therefore, it is important to understand the prevalence status and spatial distribution of human echinococcosis in order to advance our knowledge of basic information for prevention and control measures reinforcement. Methods Report data on echinococcosis were collected in 370 counties in China in 2018 and were used to assess prevalence and spatial distribution. SPSS 21.0 was used to obtain the prevalence rate for CE and AE. For statistical analyses and mapping, all data were processed using SPSS 21.0 and ArcGIS 10.4, respectively. Chi-square test and Exact probability method were used to assess spatial autocorrelation and spatial clustering. Results A total of 47,278 cases of echinococcosis were recorded in 2018 in 370 endemic counties in China. The prevalence rate of human echinococcosis was 10.57 per 10,000. Analysis of the disease prevalence showed obvious spatial positive autocorrelation in globle spatial autocorrelation with two aggregation modes in local spatial autocorrelation, namely high-high and low-high aggregation areas. The high-high gathering areas were mainly concentrated in northern Tibet, western Qinghai, and Ganzi in the Tibetan Autonomous Region and in Sichuan. The low-high clusters were concentrated in Gamba, Kangma and Yadong counties of Tibet. In addition, spatial scanning analysis revealed two spatial clusters. One type of spatial clusters included 71 counties in Tibet Autonomous Region, 22 counties in Qinghai, 11 counties in Sichuan, three counties in Xinjiang Uygur Autonomous Region, two counties in Yunnan, and one county in Gansu. In the second category, six types of spatial clusters were observed in the counties of Xinjiang Uygur Autonomous Region, and the Qinghai, Gansu, and Sichuan Provinces. Conclusion This study showed a serious prevalence of human echinococcosis with obvious spatial aggregation of the disease prevalence in China. The Qinghai-Tibet Plateau is the "hot spot" area of human echinococcosis in China. Findings from this study indicate that there is an urgent need of joint strategies to strengthen efforts for the prevention and control of echinococcosis in China, especially in the Qinghai-Tibet Plateau.

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