scholarly journals Development and Operation of the Harwell Small Counter Facility for the Measurement of 14C in Very Small Samples

Radiocarbon ◽  
1983 ◽  
Vol 25 (2) ◽  
pp. 565-575 ◽  
Author(s):  
R L Otlet ◽  
George Huxtable ◽  
G V Evans ◽  
D G Humphreys ◽  
T D Short ◽  
...  

The Harwell system for measuring milligram size samples using Brookhaven miniature gas counters is fully operative. It comprises 12 counters of different sizes which operate simultaneously within a single NaI crystal (300mm diameter × 300mm long) acting as an anti-coincidence guard counter. Brief details are given of the construction and commissioning of the system, including counter assembly, shield design, electronics, data capture, data analysis, and chemical processing and filling procedures. The performance of the system and an overall view of the fields of application for which the counters have important applications are discussed.

2015 ◽  
Vol 25 ◽  
pp. S496
Author(s):  
M. Eftekhari ◽  
A. Berntsson ◽  
S. Svensson ◽  
J. Hjortsberg ◽  
E. Jedenius ◽  
...  

2019 ◽  
Vol 8 (1) ◽  
pp. 32
Author(s):  
Monita Destiwi

One of the problems being faced by Indonesia is the population explosion. The increasing population is a result of the increasing birth rate. To lower thebirth rate the use of long acting contraceptive methods is being promoted. Based on data from SDKI 2012, the percentage of the the use of contraceptives in East Java is still dominated by the use of short acting contraceptive methods (80.99 percent). Meanwhile the long acting contraceptive methods are still lacking in use. One type of long acting contraceptive methods is implant. This study is aimed at exploring the factors that influence the use of implants in the East Java Province based on data from SUSENAS 2015. This is a non-reactive study which used a secondary data analysis with a cross-sectional design. The sample was taken from the data of female respondents of SUSENAS 2015 who were 15–49 years old, used implant methods and lived in East Java. Chi square test and logistic regression were used to analyze the data.The results showed that women who were 30 years of age or older (OR = 3.653), had at least three children (OR = 2.563) and had previous experinces with modern contraceptives (OR = 0.109) affected the use of contraceptive implant methods in East Java. It is expected that by conducting education and socialization on the use of contraceptive implants for family planning to couples at reproductive ages, the use of contraceptive implants can be more optimized.


Author(s):  
ZHENG Zhijun ◽  
PENG Yanbin

Aiming at the problem of "dimension disaster" in hyperspectral image classification, a method of dimension reduction based on manifold data analysis and sparse subspace projection (MDASSP) is proposed. The sparse coefficient matrix is established by the new method, and the sparse subspace projection is carried out by the optimization method. To keep the geometric structure of the manifold, the objective function is regularized by the manifold learning method. The new method combines sparse coding and manifold learning to generate features with better classification ability. The experimental results show that the new method is better than other methods in the case of small samples.


Author(s):  
Mitko Gospodinov ◽  
Galya Nikolova Georgieva-Tsaneva ◽  
Evgeniya Gospodinova ◽  
Krasimir Cheshmedzhiev

The implementation of photoplethysmographic sensors in the data capture and data storage to analyze the cardiovascular condition of the patient is a new direction in automatized diagnosis of the cardiovascular system. This chapter contains a description of the use of photoplethysmographic sensors in a computerized patient cardiac monitoring system. The system consists of a portable device for collection of patient's cardiac data by applying photopletithysmographic method and software for mathematical analysis. An important diagnostic parameter that can be determined by the photoplethysmographic signal is the heart rate variability. The current application of the photoplethysmographic sensors in portable automatized system is of particular importance because the results of cardiac data analysis with these methods can provide not only detailed information about the cardiovascular status of the patients but also provide the opportunity to generate new knowledge about the diagnosis, and the prevention of pathology in cardiovascular diseases.


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