نتایج جستجو برای: 267 medium

تعداد نتایج: 242070  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شاهد - دانشکده علوم پایه 1388

introduction acetic acid bacteria are large group of obligate aerobic gram negative bacteria with the ability to oxidize ethanol to acetic acid (1). they are widely distributed in natural habitats and classified in family acetobacteraceae. members of this family are useful in industrial production of vinegar(2). acetic acid bacteria (aab) can use substrates as glucose, ethanol, lactate or glyc...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه بیرجند - دانشکده کشاورزی و منابع طبیعی 1394

در حال حاضر مهم ترین منبع تامین انرژی بشر سوخت های فسیلی است. مصرف این سوخت ها منجر به تولید گاز هایی نظیر so2، co2 و nox می گردد، که 10تا 15 درصد از این گاز ها به co2 اختصاص دارد. طی صد سال گذشته میزان اتمسفری co2 از ppm 260 به ppm 380 افزایش یافته است. افزایش غلظت اتمسفری co2 به عنوان یکی از علل اصلی گرم شدن جهانی زمین مطرح می باشد. از میان راه های مختلف کاهش سطح co2 جو، ترسیب زیستی آن توسط ر...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان - دانشکده ادبیات و علوم انسانی 1392

the present study seeks to determine the effect of explicit instruction of metacognitive strategies on iranian high school students’ reading comprehension ability. it also attempts to investigate the relationship between the learners reading comprehension and metacognitive strategies. furthermore, the study investigates whether iranian efl female high school students are high, medium, or low me...

2011
Namheun Son Sangjin Lee

Today, people use a variety of digital devices, and events taking place in them are stored in specific forms mostly including data indicating when each event took place. So far, different methods have been constantly researched and developed to analyse various events, most of which analyse event data unnecessary for a forensic investigation. As a result, investigators should carry out additiona...

Journal: :Optics letters 1993
J Rosen M Segev A Yariv

We demonstrate recording and reconstruction of multiple-computer-generated wavelength-multiplexed volume holograms in a holographic storage medium. The holograms display high selectivity, and their reconstruction process results in a convenient conversion of wavelength into angular multiplexing.

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2005
K B Blyuss P Ashwin A P Bassom C D Wright

We study the dynamics of crystallization in phase-change materials using a master-equation approach in which the state of the crystallizing material is described by a cluster size distribution function. A model is developed using the thermodynamics of the processes involved and representing the clusters of size two and greater as a continuum but clusters of size one (monomers) as a separate equ...

Journal: :SIAM J. Applied Dynamical Systems 2007
Peter Ashwin Gábor Orosz John Wordsworth Stuart Townley

Systems of globally coupled phase oscillators can have robust attractors that are heteroclinic networks. We investigate such a heteroclinic network between partially synchronized states where the phases cluster into three groups. For the coupling considered there exist 30 different three-cluster states in the case of five oscillators. We study the structure of the heteroclinic network and demon...

1966
MASAHIRO OZEKI ALAN R. FREEMAN HARRY GRUNDFEST

I N T R O D U C T I O N Pharmacological data were among the evidence which led to the view that the over-all electrophysiological manifestations of different excitable membranes are composites of a number of independently assorting electrogenic processes (Grundfest, 1961 a, b). Subsequently available data (cf. Grundfest, 1963, 1966 a, b) have reenforced this view, that the excitable membrane is a

2013
Lee A. Segel Leah Edelstein-Keshet

A Primer on Mathematical Models in Biology Lee A. Segel and Leah Edelstein-Keshet This textbook grew out of a course that the popular and highly respected applied mathematician Lee Segel taught. It introduces differential equations, biological applications, and simulations and emphasizes molecular events, excitable systems, and small protein and genetic circuits. It is intended for upper-level ...

Journal: :CoRR 2004
Evangelos G. Karatsiolis Marcus Lippert Alexander Wiesmaier A. Pitaev Markus Ruppert Johannes A. Buchmann

This paper proposes the Intra Trustcenter Protocol (ITP), a flexible and secure management protocol for communication between arbitrary trustcenter components. Unlike other existing protocols (like PKCS#7, CMP or XKMS) ITP focuses on the communication within a trustcenter. It is powerful enough for transferring complex messages which are machine and human readable and easy to understand. In add...

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