Principal component analysis (PCA) based on singular value decomposition (SVD) of hydrological data was tested for water quality assessment. Using two case studies of wasteand drinking water, PCA via SVD was able to find latent variables which explain 80.8% and 83.7% of the variance, respectively. By means of scatter and loading plots, PCA revealed the relationships among samples and hydrochemi...

Factor analysis (FA) is a statistical technique similar to principal component analysis (PCA) for explaining the variance in a data set in terms of underlying linear factors. Unlike PCA, however, FA has not been widely exploited for face or object recognition. This paper explains the differences between PCA and FA, and confirms that PCA outperforms FA in a standard face recognition task. Howeve...

introduction: the present study aimed to investigate the psychometric properties of grasha-riechmann student learning styles scale. method: the participants included 1039 students (421 students in human and 618 students in technical sciences), selected through the stratified sampling method from tehran university. they answered the grasha-riechmann student learning style scale and the data was ...

this explanatory research was done with the aim of studying the factors affecting the university of tehran agricultural colleges’ faculty members’ professional development as based on a survey research. the population of the research consisted of agricultural faculty members engaged at tehran university (n=103), using random samplings methods. a questionnaire was developed by researchers as the...

PFA was not different with shaded vs. exposed limbs of the same trees nor between shaded interior trees and outside ones with high light exposure. Tehama trees expressed lower PFA than adjacent Serre PFA of Tehama was also low at a site where Serr trees (removed 1982) had very high drop the previous three years. Fruitfulness of all monitored limbs in 1982 ranged from 6 to 97% and the earlier co...

Background: Overcrowding is an important problem for outpatient services in healthcare facilities. Patient flow analysis (PFA) is a useful method for identifying inefficiencies in and facilitating patient flow. Objective: PFA was used to estimate patient wait time and determine how different clinical disciplines impact wait times in the studied hospital.<...

Obesity and inadequate sleep are among the most common causes of health problems in modern society. Thus, the discovery that orexin (hypocretin) neurons play a pivotal role in sleep/wake regulation, energy balance, and consummatory behaviors has sparked immense interest in understanding the regulatory mechanisms of these neurons. The local network consisting of neurons and astrocytes within the...

Systemic treatment with bevacizumab is associated with increased rates of arterial and venous thromboembolism and haemorrhage. In order to investigate the pathophysiological mechanism involved, platelet adhesive and aggregatory functions were tested with a platelet function analyser (PFA-100®) in an in vitro study and in a longitudinal clinical observation study. For the in vitro study, blood f...

With the importance of intellectual capital and the interactions of different components in determining the value of the company, it becomes essential for the company to develop a system of management and monitoring its evolution, in order to increase or improve the value of its various activities. In fact, the various components of intangible assets are related to each other and to the financi...