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نویسندگان: 

WEARVER W. | JOHNSTON P.R.

اطلاعات دوره: 
  • سال: 

    1987
  • دوره: 

    -
  • شماره: 

    -
  • صفحات: 

    0-0
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    103
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

شاخص‌های تعامل:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

بازدید 103

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نویسندگان: 

JORDI GALI | MARK GERTLER

اطلاعات دوره: 
  • سال: 

    1999
  • دوره: 

    44
  • شماره: 

    2
  • صفحات: 

    195-222
تعامل: 
  • استنادات: 

    1
  • بازدید: 

    141
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

شاخص‌های تعامل:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

بازدید 141

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نویسندگان: 

KASTHURI NARAYANAN | LICHTMAN J.W.

اطلاعات دوره: 
  • سال: 

    2004
  • دوره: 

    14
  • شماره: 

    1
  • صفحات: 

    105-111
تعامل: 
  • استنادات: 

    1
  • بازدید: 

    131
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

شاخص‌های تعامل:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

بازدید 131

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مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
اطلاعات دوره: 
  • سال: 

    2016
  • دوره: 

    19
تعامل: 
  • بازدید: 

    139
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

ONE OF THE MOST IMPORTANT TYPES OF ANTIOXIDANTS ARE FLAVONOIDS WHICH CONTAIN FLAVONOLS, FLAVONONES, ISOFLAVONES, ETC. BECAUSE OF THE IMPORTANCE OF QUERCETIN AS AN ANTIOXIDANT, THE PRESENT STUDY PAYS SPECIAL ATTENTION TO THIS COMPOUND OF FLAVONOLS. THE MAIN FOCUS OF THIS INVESTIGATION IS TO EXPLORE Structural PROPERTIES OF QUERCETIN BY MOLECULAR Dynamics SIMULATION. THE RESULTS SHOW THAT INTERMOLECULAR HYDROGEN BONDS BETWEEN QUERCETIN AND WATER ARE STRONGER THAN WATER-WATER INTERACTIONS. IN ADDITION, INTRAMOLECULAR HYDROGEN BOND IN QUERCETIN IS OBSERVED. ...

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بازدید 139

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اطلاعات دوره: 
  • سال: 

    2014
  • دوره: 

    17
تعامل: 
  • بازدید: 

    150
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

INTRODUCTION: THE GROWING TREND OF GREENHOUSE GAS EMISSION HAS STIMULATED THE STUDY OF CARBON DIOXIDE CAPTURE TECHNOLOGIES. CARBON DIOXIDE IS AN ACIDIC GAS AND ITS PRESENCE MORE THAN THE STANDARD LIMIT CAN UNDERTAKE SERIOUS PROBLEMS SUCH AS PIPELINE CORROSION, GAS HEATING VALUE REDUCTION, AND CATALYST POISONING [1]. SOME CANDIDATES TO BE USED IN SWEETENING PROCESS ARE ALKANOLAMINE SOLVENTS WITH DIFFERENT AMINE STRUCTURES SUCH AS MONOETHANOLAMINE (MEA), DIETHANOLAMINE (DEA), AND METHYL DIETHANOLAMINE (MDEA)...

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بازدید 150

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اطلاعات دوره: 
  • سال: 

    2014
  • دوره: 

    3
  • شماره: 

    SUPPL. (1)
  • صفحات: 

    186-186
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    357
  • دانلود: 

    0
چکیده: 

Amylin is a 37 residue peptide with a disulfide bridge between the residues 2 and 7. This hormone co-secreted with insulin by pancreatic islet b-cells. It has been reported that amylin is able to form amyloid fibrils. Although these fibrils are not related with the manifestation of type 2 diabetes, they have a significant role in the aggravation of diabetic condition. In this study, the potential of amyloid formation and stability of amylin has been studied in 10 species with high sequence similarity (80%), with the use of molecular Dynamics simulation. Based on the structure of human amylin (2L86.pdb from Protein Data Bank) homology modeling technique was used to create 10 different species amylin. Simulation was performed using GROMACS version 4.6.1, with a 10 ns duration and 500K. The systems were solvated with SPC water molecules. Secondary structure content was calculated using DSSP. Other analyses such as energy, solvent accessible surface, radius of gyration, RMSD and RMSF were performed, using GROMACS. Human and Rat amylin were selected as non-aggregating peptides respectively. During simulation amylin showed remarkable Structural changes, and in most cases α-helical structures were lost. In some species with aggregating amylin, b -sheets were formed at the end of the simulation. Between the studied species, Pongoabelii peptide, one of the two species of orangutans used in this study, showed more stability alongside with more similarity to human amylin. Based on these results, this amylin specie could be proposed as a potential therapeutic peptide, as an alternative to rat amylin.

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بازدید 357

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اطلاعات دوره: 
  • سال: 

    2016
  • دوره: 

    15
تعامل: 
  • بازدید: 

    180
  • دانلود: 

    0
چکیده: 

AN ANALYTICAL SOLUTION FOR THE Structural Dynamics OF ELASTIC FLAPPING WINGS UNDERGOING PRESCRIBED RIGID BODY MOTION IS PRESENTED. THE GOVERNING EQUATION OF ELASTIC WING STRUCTURE IS OBTAINED USING THE GALERKIN METHOD AND RITZ APPROXIMATION. DUE TO IMPORTANCE OF DERIVING AN ANALYTICAL SOLUTION, ONLY INERTIAL FORCES DUE TO THE ACCELERATED MOTION ARE CONSIDERED. THE PRESCRIBED RIGID BODY MOTION IS CREATED VIA A SERVO MOTOR WITH HAVING A 2ND ORDER Dynamics. THE RESULTING ANALYTICAL SOLUTION, ENABLES ONE TO ASSESS THE COUPLING BETWEEN CONTROL, STRUCTURE AND INERTIAL FORCES. INCLUSION OF THE SERVO MOTOR DYNAMIC AND ITS ANALYSIS SHOW A DELAY AS WELL AS A CHANGE IN THE MOTION AMPLITUDE AS TO ITS EFFECT. WITH THE AID OF THE ANALYTICAL SOLUTION, THE DAMPING PROPERTIES OF THE STRUCTURE, THE RESONANCE PHENOMENA AND ITS OCCURRENCE PREREQUISITE HAVE ALSO BEEN INVESTIGATED. FINALLY, A COMPLETE FLAPPING FLIGHT SCENARIO IS SIMULATED. FOR THIS SIMULATION SCENARIO, A RECTANGULAR WING IS MODELLED USING ELASTIC BEAM AND SHELL ELEMENTS THAT IS UNDER PRESCRIBED SINUSOIDAL FORCING. BECAUSE OF THE WING’S SIMPLICITY, THE Structural MODAL PROPERTIES SUCH AS NATURAL FREQUENCIES AND MODE SHAPES ARE COMPUTED USING FEM ANALYSIS. RESULTS ALSO STRONGLY DEMONSTRATE THE SIGNIFICANCE OF INERTIAL FORCES IN Structural DEFORMATIONS.

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نویسنده: 

ESLAMI HOSEIN | Behrouz Marzieh

اطلاعات دوره: 
  • سال: 

    2013
  • دوره: 

    16
تعامل: 
  • بازدید: 

    116
  • دانلود: 

    0
چکیده: 

INTRODUCTION: POLYMER NANOCOMPOSITES ARE A NEW CLASS OF COMPOSITE MATERIALS, RECEIVING A SIGNIFICANT ATTENTION BOTH IN ACADEMIA AND INDUSTRY. COMPARED TO DIFFERENT NANOFILLERS, CARBON NANOTUBES HAVE EMERGED AS THE MOST PROMISING NANOFILLER FOR POLYMER COMPOSITES DUE TO THEIR REMARKABLE MECHANICAL, ELECTRICAL AND THERMAL PROPERTIES [1]. THE PURPOSE OF THIS STUDY IS TO SIMULATE A POLYMER/NANOTUBE NANOCOMPOSITE IN ORDER TO SHED LIGHT ON ITS Structural PROPERTIES FROM A FUNDAMENTAL POINT OF VIEW.

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اطلاعات دوره: 
  • سال: 

    1394
  • دوره: 

    14
  • شماره: 

    1 (پیاپی 21)
  • صفحات: 

    85-103
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    1115
  • دانلود: 

    417
چکیده: 

طی سال های اخیر یافتن راهی برای مواجه با محیط های پر تغییر و حفظ بقای سازمان به چالش مهمی در میان محققان حوزه مدیریت بدل شده است. در این میان رویکرد قابلیت های پویا از اهمیت ویژه ای برخوردار شده است. بررسی متون موجود در این حوزه نشان می دهد یکی از الزامات پژوهشی، بررسی اثرات پویایی محیطی بر قابلیت های پویا است. لذا در این مقاله رابطه قابلیت های پویا و پویایی محیطی مورد بررسی قرار خواهد گرفت. بدین منظور الگویی متشکل از سازه قابلیت های پویا (شامل قابلیت درک، قابلیت استفاده از فرصت ها و قابلیت شکل دهی مجدد منابع) و پویایی محیطی (شامل پویایی فنی و پویایی بازار) طراحی شد. داده های پژوهش از طریق پرسشنامه و بر مبنای پاسخ های مدیران عالی شرکت های تولیدی فعال در بورس اوراق بهادار تهران جمع آوری شد. نتیجه بررسی های انجام شده با استفاده از روش کمترین مربعات جزیی و نرم افزار SmartPLS نشان داد رابطه بین پویایی محیطی و قابلیت های پویا به عنوان سازه های سطح بالاتر معنادار است. همچنین پویایی فنی بر قابلیت درک، قابلیت استفاده از فرصت ها و قابلیت شکل دهی مجدد منابع، همچنین پویایی بازار بر قابلیت درک و قابلیت استفاده از فرصت ها تأثیر مثبت دارد.

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بازدید 1115

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اطلاعات دوره: 
  • سال: 

    2014
  • دوره: 

    8
تعامل: 
  • بازدید: 

    136
  • دانلود: 

    0
چکیده: 

NONUNIFORM SEISMIC MOTION AFFECTS THE SEISMIC BEHAVIOR OF LARGE STRUCTURES SUCH AS LONG-SPAN BRIDGES.THREE MAIN REASONS FOR THIS NONUNIFORMITY HAVE BEEN IDENTIFIED. THEY ARE LOCAL SOIL CONDITIONS, WAVEPASSAGE, AND INCOHERENCY EFFECTS. OTHER EFFECTS, SUCH AS EXTENDED SOURCE AND ATTENUATION, ARE RELATIVELYSMALL. THE IMPORTANCE OF NONUNIFORM SEISMIC MOTIONS, ESPECIALLY FOR SENSITIVE AND IMPORTANT STRUCTURES, HAS LED TO THE DEVELOPMENT OF SEVERAL METHODS OF ANALYSIS. THIS PAPER PRESENTS A DIRECT FREQUENCY-DOMAINMETHOD THAT IS BASED ON NEURAL NETWORK AND OPTIMIZATION. THE USE OF THIS DIRECT FREQUENCY-DOMAIN METHODFOR SOLVING NONUNIFORM SEISMIC MOTIONS IS SHOWN. FINALLY, THE APPLICATION OF THE PROPOSED METHOD TO ASIMPLE MULTIPLE PARTICLE DAMPED SYSTEM UNDER HARMONIC LOADING IS PRESENTED AND THE VALIDITY ANDFEASIBILITY OF THE TRANSFORMATION ALGORITHM IN TIME-DOMAIN AND FREQUENCY-DOMAIN ARE NUMERICALLYVERIFIED.

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