g. heidari

To analyze the cross impact of driving forces on the Future of Library Catalogs in Iran.

This is an applied study using desk research, survey, and cross impact analysis. Cross impact analysis and MICMAC software were used to analyze the cross impact and determine key driving forces to perform mathematical calculations of the cross impact of the influential and affective variables.

The findings showed that the system was unstable. Among the variables, 3 variables were in the group of influential variables, 3 variables in the group of Relay variables, 4 variables in the group of Dependent variables, and 3 variables in the group of independent variables. Finally, four variables such as "quantity and quality of library catalogs in the virtual environment", "modification and updating of tools and standards", "library without walls", and " Interaction between library cataloging professionals and library system designers" were identified as strategic variables.

The relationships identified among the driving forces affecting the future of library catalogs in Iran indicate the importance of changing the traditional environment of catalogs and their entry into the new information environment. Attention to identified strategic forces can also drive the chain movement for future of the system.

In this paper no-load and full-load performance of Permanent Magnet Vernier Generators (PMVGs) is investigated in fully-aligned condition and under different types of mechanical faults. The studied mechanical faults are Static Eccentricity (SE), Dynamic Eccentricity (DE), Inclined Rotor (IR), and Run-out (RO). Furthermore, an analytical model is developed to calculate the permeance of the air-gap and the induced voltages in the health machine and under studied mechanical faults. Then, 2-D and 3-D time stepping finite element method is utilized for performance evaluation of the generator. Some discussions are made on the quality of induced voltages, torque ripples, variations of axial and radial forces and the output power of the generator under the mechanical faults considering resistive, inductive and capacitive loads connected to the terminals of the generator. Finally, the performance of an outer rotor conventional permanent magnet generator (CPMG), considering constant dimensions, constant PM, copper and iron usage is compared with the studied PMVG. The performance of two generators is studied in fully-aligned condition as well as under SE and DE.

A mathematical model based on d-q axis theory and dynamic performance characteristic of brushless resolvers is discussed in this paper. The impact of rotor eccentricity on the accuracy of position in precise applications is investigated. In particular, the model takes the stator currents of brushless resolver into account. The proposed model is used to compute the dynamic and steady state equivalent circuit of resolvers. Finally, simulation results are presented. The validity and usefulness of the proposed method are thoroughly verified with experiments.

Because of temperature independence, high resolution and noiseless outputs, brushless resolvers are widely used in high precision control systems. In this paper, at first dynamic performance characteristics of brushless resolver, considering parameters identification are presented. Then a mathematical model based on d-q axis theory is given. This model can be used for studying the dynamic behavior of the resolver and steady state model is obtained by using dynamic model. The main object of this paper is to present an approach to identify electrical and mechanical parameters of a brushless resolver based on DC charge excitation and weight, pulley and belt method, respectively. Finally, the model of resolver based on the obtained parameters is simulated. Experimental results approve the validity of proposed method.

Hunting is a flutter associated with the synchronous speed that gives rise to the gyro drifting errors and may cause objectionable time-displacement errors in video head wheel drives and other precision scanning systems. In this paper, dynamic characteristics of permanent Magnet hysteresis motors are presented and hunting is explained. New damping techniques have been developed using optimized eigenvalues calculation. They are calculated from LQR optimization method. In this damping method, a distinct reduction in hunting has been archived. Furthermore field oriented control result of motor is presented that have good effect on Hunting. Nearest agreement between simulated and measurement results shows the accuracy of motor model. Comparison between this paper results and other measured damping methods result are shown its success.

Cardiovascular system is one of the human organs that can be affected seriously by kidney failure and hemodialysis. Because of the increase in the atherosclerosis producing factors, the prevalence of cardiovascular disorders in hemodialysis patients is higher than normal. Cardiovascular diseases are account for 40% of deaths in hemodialysis patients which is approximately three times of normal nonuremic population. This study was performed to investigate the prevalence of cardiovascular disorders in Sanandaj hemodialysis patients. Statistical population included all of the hemodialysis patients (n=40) that referred to Tohid hospital hemodialysis center from March 1999 to June. Data that was collected by interview, clinical examination and echocardiography was registered in questionnaire. Cardiovascular disorders among hemodialysis patients were as follow; Hypertension (50%), left ventricular hypertrophy (72.5%), pericardial effusion (62.5%), decrease in cardiac output (20%), diastolic dysfunction (52.5%). The age of population under study was between 14-73 years and duration of dialysis was between 1 to 74 months. 26 patients were females and 14 were males. The duration of dialysis varied between 5 to 12 hours in a week. The results of this study showed that cardiovascular disorders in hemodialysis patients of Sanandaj are higher than what has been reported in reference books. Further studies are needed to elucidate the cause or causes of this difference and the ways to solve that.

Cardiovascular health is a health priority area in all societies, especially in developing countries. This study was done to respond to the concerns raised about the priority of establishing a coronary angiography centers in Kurdistan province, especially with respect to the limitation of resources and considering other priorities. The study was descriptive and statistical population included 209 patients referred to health clinics that were diagnosed must undertake coronary angiography. Required data regarding demographic and angiography indication were registered in questionnaire. Data was analyzed with SPSS Win software and descriptive statistics. The results showed that coronary angiography was needed in 209 patients including 80 female (38.3 percent) and 129 male. The average age of patients was 54 year with standard deviation of 12. From this group 114 patients (55.3%) declared that they could refer to other centers for angiography but just 60 patients (28.7%) referred. The information obtained from this study shows that establishing a coronary angiography center in Kurdistan province is a top priority and will increase the unseen burden of the coronary angiography.

INTRODOCTIONS: Shahid Baheshti medical university hospitals have been known as the impotant centers that gives a wide range theraputic and educational services to Iranian society. Being aware of the needs and motivational causes of effecctive presence of physician in those centers and suggesting some strategies for their effective presence is an important step toward service improvement. The variables of this research including salary, job security, educational needs, job improvement, respect to physician by manager and personnel and the relation between physician were selected using the Herzberg model. Some of this variables were considered as a factor for unleaving the job and others were considerd as motivational factors. For this purpose a questionnaire was prepared and was filled by sixty faculty member in Loghman and Taaleghani hospitals. Fourthy-eight percent of physicians declared that hospital income covers only 20% of thier accomodation. Fourty-three and fourthy percent of physicians declared that their presence in hospitals for educational and theraputic purposes are usual. Upon the results obtained from this study for effective presence of physician in hospitals we must provides their needs using strategies such as giving rewards based on effective pressence, logical theraputic service tariff, job security, job improvement condition.