scholarly journals Electric resistance tomography and stress wave tomography for decay detection in trees—a comparison study

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e6444 ◽  
Author(s):  
Xiaoquan Yue ◽  
Lihai Wang ◽  
James P. Wacker ◽  
Zhiming Zhu
Keyword(s):  
Stress Wave ◽  
Ordinary Least Squares ◽  
Operating Conditions ◽  
Strong Positive Correlation ◽  
Least Squares Regression ◽  
Electric Resistance ◽  
Correlation Relationship ◽  
Positive Correlation ◽  
Standing Trees ◽  
Wave Tomography

Background To ensure the safety of trees, two NDT (nondestructive testing) techniques, electric resistance tomography and stress wave tomography, were employed to quantitatively detect and characterize the internal decay of standing trees. Comparisons between those two techniques were done to make full use of the individual capability for decay detection. Methods Eighty trees (40 Manchurian ash and 40 Populus simonii) were detected, then wood increment cores were obtained from each cross disc trial. The Dt, which was defined as the value determined by the mass loss ratio of each wood core, was regarded as the true severity of decay. Using ordinary least-squares regression to analyze the relationship between Dt and De (De was defined as the severity of decay determined by electric resistance tomography) and between Dt and Ds (Ds was defined as the severity of decay determined by stress wave tomography). Results The results showed that both methods could estimate the severity of decay in trees. In terms of different stages of decay, when Dt < 30%, De had a strong positive correlation with Dt (R2 = 0.677, P < 0.01), while, when Dt ≥ 30%, Ds had a significant positive correlation relationship with Dt (R2 = 0.645, P < 0.01). Conclusion Electric resistance tomography was better than stress wave tomography for testing in the early stages of decay, while stress wave tomography can be used effectively in the late stage of decay. It is suggested that each technique can be used in the practice of internal decay testing of standing trees based on decay stages and operating conditions.

scholarly journals The role of electronic service and pricing in attracting customers (A field study on the Sudanese banking sector): دور الخدمة الإلكترونية والتسعير في جذب العملاء (دراسة ميدانية في القطاع المصرفي السوداني)

2020 ◽  
Vol 4 (12) ◽  
Author(s):  
Elham Ezeldeen Hassan, Naamat Muhammad Saeed
Keyword(s):  
Financial Services ◽  
Banking Sector ◽  
Business Environment ◽  
Strong Positive Correlation ◽  
Correlation Relationship ◽  
Positive Correlation ◽  
Statistical Function ◽  
Electronic Service ◽  
The Impact ◽  
The Relationship

The study dealt with the relationship of electronic service and electronic pricing in attracting customers by applying to the Sudanese banking sector The problem of the study lies in identifying the relationship between electronic service and electronic pricing in attracting customers by identifying the quality of the correlation between electronic service and electronic pricing and attracting customers and the importance of the study stemmed from The big role that banks play in providing financial services in Sudan and through information and data and analyzing them to benefit from them, and the main goal of this study is to try to reveal the impact of electronic marketing My clients in the bank attract, the study seeks to test the following hypotheses of the study, there is a strong positive correlation with statistical function between the electronic service and attract customers, and there is a positive correlation relationship with a medium statistical function between the electronic pricing and attract customers. The study followed the historical approach, deductive approach, descriptive approach and inductive approach, the study reached a number of results, the most important of which is that providing good electronic service is no longer optional or a set of slogans and methods of advertising but rather has become a reality imposed by the nature of conditions and variables in the contemporary business environment as imposed by the nature and characteristics of clients themselves, the basis To achieve success, growth and continuity in the market depends on the presence of a customer base and the strengthening of the relationship between customers and the bank, and one of the most important recommendations recommended by the study is the establishment of sections for electronic banking services in the bank’s branches and the establishment of an ester Tejah marketing is working to attract more of both cases, customers continuity in the creation of the bank's branches and improve the work, the use of modern software in the electronic service to keep pace with technological developments, taking into account security and safety in the payment of the amounts of buying and selling via computer networks because of concerns arising from the possibility of interception and theft.

Macro-Level Analysis of Factors Related to Areawide Highway Traffic Congestion

2002 ◽  
Vol 1817 (1) ◽  
pp. 11-16 ◽  
Author(s):  
Elisabeth Hahn ◽  
Arun Chatterjee ◽  
Mary Sue Younger
Keyword(s):  
Population Density ◽  
Traffic Congestion ◽  
Travel Demand ◽  
Strong Positive Correlation ◽  
Least Squares Regression ◽  
Highway Traffic ◽  
Land Area ◽  
Related Factors ◽  
Positive Correlation ◽  
Travel Rate

The relationship between traffic congestion, travel demand, and supply of roadways is investigated by use of the travel rate index, a congestion measure developed by researchers at the Texas Transportation Institute. Data for the top 138 urbanized areas (by population) were assembled for developing a least-squares regression model. The travel rate index was selected as the response (dependent) variable. A variety of explanatory variables were used to address highway and transit supply and travel demand-related factors. The partial regression coefficients measured the effect of each explanatory (independent) variable on congestion (as measured by travel rate index), holding all other independent variables constant. The results of the multiple regression analysis indicated a negative correlation between freeway lane miles and combined travel rate index. Additionally, a strong positive correlation was observed between combined travel rate index and population density and net land area. A positive correlation was observed between combined travel rate index and bus transit service revenue miles. Principal arterial lane miles and rail transit revenue miles variables were not observed to be significant for explaining traffic congestion and were removed entirely during the stepwise regression. The results indicated that the best predictors among the tested variables were freeway lane miles, population density, net land area, and bus revenue miles. When used together, these predictors accounted for approximately 61% of the total variation in the dependent variable, combined travel rate index.

The Strong Positive Correlation between Factor VII Clotting Activity Using Bovine Thromboplastin and the Activated Factor VII Level

1995 ◽  
Vol 73 (03) ◽  
pp. 429-434 ◽  
Author(s):  
Kazuomi Kario ◽  
Takefumi Matsuo ◽  
Reiko Asada ◽  
Toshiyuki Sakata ◽  
Hisao Kato ◽  
...  
Keyword(s):  
Risk Factor ◽  
Bovine Brain ◽  
Factor Vii ◽  
Rabbit Brain ◽  
Strong Positive Correlation ◽  
Chromogenic Substrate ◽  
Moderate Correlation ◽  
Positive Correlation ◽  
Activated Factor Vii

SummaryWe compared factor VII clotting activity (FVIIc) assays using different thromboplastins to determine which is the most sensitive for activated FVII (FVIIa) or for FVII antigen (FVIIag). FVIIc levels were measured using thromboplastins derived from bovine brain (FVIIc Bov), human placenta (FVIIc Hum), and rabbit brain (FVIIc Rab). FVIIa levels were measured by fluorogenic assays using human soluble tissue factor (rsTF) or bovine rsTF. We also measured FVII activity by an amidolytic assay (FVIIc:am Hum) using human thromboplastin and a chromogenic substrate for thrombin. FVIIag levels were determined by ELISA. In the FVIIa assay, the reaction time obtained from using bovine rsTF was shorter than that with human rsTF, suggesting that the interaction of plasma FVIIa with bovine rsTF was stronger than with human rsTF. The plasma FVIIa levels measured using human rsTF and bovine rsTF were almost the same (r=0.947, p<0.0001). Among the three FVIIc assays, FVIIc Bov had the strongest positive correlation with the plasma FVIIa level (r=0.886, p<0.000l), but had no correlation with FVIIag. An increase of 1 ng/ml in the plasma FVIIa level yielded a 27.9% increase of FVIIc Bov. Plasma FVIIc Hum and FVIIc:am Hum showed moderate correlations with both FVIIa (r=0.520, p<0.02 and r=0.569, p<0.01, respectively) and FVIIag (r=0.438, p<0.05 and r=0.468, p<0.05, respectively). FVIIc Rab had the lowest correlation with FVIIa (r=0.367, p<0.1), but had a moderate correlation with FVIIag (r=0.436, p<0.05). After in vitro cold activation, FVIIc Bov levels increased the most and FVIIc:am levels showed the least change. These findings indicate that consideration of the thromboplastin used for assay is necessary when assessing the clinical significance of FVII activity as a cardiovascular risk factor.

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