Iranian Scholarly Journals: An Annotated Bibliography     

Golnessa Galyani Moghaddam  Amir Vafaeian 《期刊图书馆员》2013,64(1):54-100

This is an annotated bibliography of peer-reviewed scholarly journals that are currently published in Iran. The titles included are a selective and representative sampling. The entry for each periodical includes the following information: title, subject, date founded, frequency, editor, price, language, publisher, address, phone number, FAX number, Web address, ISSN, circulation, indexing/abstracting sources, impact factor, ministry, and an abstract/annotation.  相似文献   

Numerical study of the melting of nano-enhanced phase change material in a square cavity     

Seyed Sahand SEBTI  Mohammad MASTIANI  Hooshyar MIRZAEI  Abdolrahman DADVAND  Sina KASHANI  Seyed Amir HOSSEINI 《浙江大学学报(A卷英文版)》2013,14(5):307-316

A comprehensive numerical study was conducted to investigate heat transfer enhancement during the melting process in a 2D square cavity through dispersion of nanoparticles. A paraffin-based nanofluid containing various volume fractions of Cu was applied. The governing equations were solved on a non-uniform mesh using a pressure-based finite volume method with an enthalpy porosity technique to trace the solid-liquid interface. The effects of nanoparticle dispersion in a pure fluid and of some significant parameters, namely nanoparticle volume fraction, cavity size and hot wall temperature, on the fluid flow, heat transfer features and melting time were studied. The results are presented in terms of temperature and velocity profiles, streamlines, isotherms, moving interface position, solid fraction and dimensionless heat flux. The suspended nanoparticles caused an increase in thermal conductivity of nano-enhanced phase change material (NEPCM) compared to conventional PCM, resulting in heat transfer enhancement and a higher melting rate. In addition, the nanofluid heat transfer rate increased and the melting time decreased as the volume fraction of nanoparticles increased. The higher temperature difference between the melting temperature and the hot wall temperature expedited the melting process of NEPCM.  相似文献   

Quantitative estimation of dust fall and smoke particles in Quetta Valley     

Sami M  Waseem A  Akbar S 《Journal of Zhejiang University. Science. B》2006,7(7):542-547

INTRODUCTION Over the recent decades extensive research on atmospheric particles in urban environments was carried out. Most of the following papers refer to their authors’ contribution to air pollution and the effects on human health (Dzubay and Mamane, 1989; van Borm et al., 1989; 1990; Rojas et al., 1990; Paoletti et al., 1991; 1999; Al-Rajhi et al., 1996; McMurry et al., 1996; Querol et al., 1996; BéruBé et al., 1997; Esteve et al., 1997; Harrison et al., 1997; Zou and Hooper…  相似文献   

Comment on “Upgrading the Iranian National Laboratory Standard to Conform to ISO 15189:2012”     

Masoud Hajia  Amir Sohrabi 《Indian journal of clinical biochemistry : IJCB》2021,36(2):244

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Polybutylcyanoacrylate Nanoparticles and Drugs of the Platinum Family: Last Status     

Dashti Rahmat Abadi Fatemeh  Hasan Ebrahimi Shahmabadi  Anita Abedi  Seyed Ebrahim Alavi  Fatemeh Movahedi  Maedeh Koohi Moftakhari Esfahani  Tahereh Zadeh Mehrizi  Azim Akbarzadeh 《Indian journal of clinical biochemistry : IJCB》2014,29(3):333-338

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An Integrated Holistic Method for Teaching Introductory German to Community College Students     

S. Amir N. Moosavi 《Community College Journal of Research & Practice》2013,37(10):797-812

The study reported in this paper investigated the effectiveness of an Integrated Holistic Teaching Method for teaching grammatical structure, cultural norms and behavior, writing and listening to German language students. The study involved a sample of 24 undergraduate students enrolled in an introductory college-level German course at a large urban community college in Texas. The research utilized a pre- and posttest design to study the instructional effectiveness of the Integrated Holistic Teaching Method. The higher posttest mean scores indicated significant improvement in student learning in the 4 major language skills areas as an artifact of involvement in the Integrated Holistic Teaching Method.  相似文献   

Comparison of sequential and simultaneous design and optimization in low-temperature liquefaction and gas separation processes     

Nassim Tahouni  M. Hassan Panjeshahi  Abtin Ataei 《Journal of The Franklin Institute》2011,348(7):1456-2446

A great deal of attention has been paid to design and optimization of low-temperature liquefaction and gas separation problems over the past years, due to their difficult nature. In this paper, two approaches featuring sequential and simultaneous methods for selection and arrangement of sub-ambient separation systems and their associated refrigeration cycles are compared. The effect of ignoring heat integration within the separation system and between the separation and refrigeration systems is addressed as well as fixing the sequence order of separation. The optimization is carried out using two famous stochastic search methods i.e. Genetic Algorithm (GA) and Simulated Annealing (SA). Three case studies are examined to illustrate the significant differences between optimization results. Also, the design optimality is re-checked with respect to usage of different refrigerants and the resulting structure is verified by application of a comprehensive exergy analysis.  相似文献   

The role of government in developing the biotechnology industry: a South African perspective     

Ramazan Uctu  Hassan Essop 《普罗米修斯》2013,31(1):21-33

Biotechnology has been identified as one of the key sectors for future economic growth in many countries, with South Africa being no exception. Consequently, the South African government introduced the National Biotechnology Strategy (NBS) in 2001 to modernise the government’s biotechnology institutions and to develop the biotechnology industry, given a changing political and technical environment. An important product of the NBS was the establishment of biotechnology regional innovation centres (BRICs) in 2002, which aimed to develop and commercialise the biotechnology industry. The BRICs, however, were effectively replaced by the creation of the Technology Innovation Agency (TIA) in 2008, which also formed part of the 10-year plan of the Department of Science and Technology (DST). The TIA’s aims are to develop South Africa’s ability to convert local research and development (R&D) into commercial products and services. This paper will explore recent changes in the role of the South African government in its attempts to support and develop the biotechnology industry.  相似文献   

Low-cost sensorless control of four-switch, brushless DC motor drive with direct back-EMF detection     

Abolfazl Halvaei Niasar  Abolfazl Vahedi  Hassan Moghbelli 《浙江大学学报(A卷英文版)》2009,10(2):201-208

We propose a position sensorless control scheme for a four-switch, three-phase brushless DC motor drive, based on the zero crossing point detection of phase back-EMF voltages using newly defined error functions （EFs）. The commutation instants are 30° after detected zero crossing points of the EFs. Developed EFs have greater magnitude rather than phase or line voltages so that the sensorless control can work at a lower speed range. Moreover, EFs have smooth transitions around zero voltage level that reduces the commutation errors. EFs are derived from the filtered terminal voltages Vao and Vbo of two low-pass filters, which are used to eliminate high frequency noises for calculation of the average terminal voltages. The feasibility of the proposed sensorless control is demonstrated by simulation and experimental results.  相似文献   

Investigating substantive and consequential validity of student ratings of instruction     

Karma El Hassan 《高等教育研究与发展》2009,28(3):319-333

This study aimed at exploring faculty and student perspectives on student evaluations, as well as identifying their perceptions of the usefulness and appropriateness of the ratings for evaluating teaching effectiveness. More specifically, the study aimed at identifying the consequences, both intended and unintended, of using the evaluations, in addition to better understanding the process students used in responding to evaluations and what use faculty members made of them. Two surveys were developed and placed on the website of the Office of Institutional Research and Assessment. Emails were sent to all students and faculty participating in evaluations soliciting their cooperation and requesting their input. Faculty and student perceptions were compared qualitatively and statistically. Results revealed that students and faculty believe in the effectiveness and usefulness of the system with the need to overcome some negative consequences and biases inherent in its application at the University. Recommendations for system improvement are provided.  相似文献