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Issue Info: 
  • Year: 

    2022
  • Volume: 

    7
  • Issue: 

    2
  • Pages: 

    253-277
Measures: 
  • Citations: 

    0
  • Views: 

    256
  • Downloads: 

    45
Abstract: 

Objective: People who have higher social health can more successfully deal with the challenges and ups and downs of playing key social roles and participate more in collective activities and prevent social deviations and anomalies. In this regard, foresight and the development of a forward-looking strategy model by the media can play an important role in promoting the social health of their audience (individuals).Method: This research has been done qualitatively and quantitatively. In the qualitative Phase, content analysis and Q methods were used, and in the quantitative Phase, factor analysis was used to analyze the Q method data.Results: The content analysis of the media in this study showed that the most media production in the Field of social deviations with 576 cases and the lowest media production in the Field of violence with 237 cases. The Field of social quality with 485 and the Field of social issues with 312 cases are in the second and third ranks. A small questionnaire was made and based on it, the desired model was designed using PLS software. Conclusion: This model showed that the function of media is effective in promoting social health of society and can have the greatest impact on improving quality of life, reducing violence, reducing social deviations and social issues.

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

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Author(s): 

JAVANBAKHT M. | LEVITAS V.I.

Issue Info: 
  • Year: 

    2017
  • Volume: 

    1
  • Issue: 

    2
  • Pages: 

    243-246
Measures: 
  • Citations: 

    0
  • Views: 

    167
  • Downloads: 

    69
Abstract: 

In this paper, a new Phase Field method for the interaction between martensitic Phase transformations and dislocations is presented which is a nontrivial combination of the most advanced Phase Field methods to Phase transformations and dislocation evolution. Some of the important points in the model are the multiplicative decomposition of deformation gradient into elastic, transformational and plastic parts, defining a proper energy to satisfy thermodynamic equilibrium and instability conditions, including Phase- dependent properties of dislocations. The system of equations consists of coupled elasticity and Phase Field equations of Phase transformations and dislocations. Finite element method is used to solve the system of equations and applied to study the growth and arrest of martensitic plate and the evolution of dislocations and Phase in a nanograined material. It is found that dislocations play a key role in eliminating the driving force of the plate growth and their arrest which creates athermal friction. Also, the dual effect of plasticity on Phase transformations is revealed; due to dislocations pile-up and its stress concentration, the Phase transformation driving force increases and consequently, martensitic nucleation occurs. On the other hand, the dislocation nucleation results in decreasing the Phase transformation driving force and consequently, the Phase transformation is suppressed.

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Author(s): 

Mirzakhani S. | JAVANBAKHT M.

Issue Info: 
  • Year: 

    2019
  • Volume: 

    19
  • Issue: 

    11
  • Pages: 

    2771-2780
Measures: 
  • Citations: 

    0
  • Views: 

    473
  • Downloads: 

    0
Abstract: 

In the present work, the nonlinear finite element method is used to solve the Phase Field equations for Phase transformations at the nanoscale. In the Phase Field theory, the evolution of a martensitic nanostructure is described in terms of several order parameters and the Ginzburg-Landau equation is a linear relationship between the of the change rate of an order parameter and the thermodynamic forces which are the variational derivative of the free energy of the system with respect to the order parameter. Since the free energy includes nonlinear terms of the order parameter, the thermodynamic forces are nonlinear functions of the order parameter. Therefore, the Phase Field equations are solved using the nonlinear finite element method and the self-developed code. The studied transformation is the conversation of cubic to tetragonal Phase in NiAl by temperature changes and neglecting the mechanical effects. Therefore, the transformation is the induction temperature type and is defined using only one order parameter. To validate the numerical work, the profile, width, energy, and velocity of the austenite-martensite interface were calculated and compared to the previous works and a very good agreement is found between them. Also, various physical problems such as plane interface propagation, martensitic nucleation, and propagation undercooling, and reverse Phase transformation under heating are simulated. The obtained results present a proper tool to solve more advanced Phase Field problems for Phase transformations at the nanoscale including mechanics effects and complex initial and boundary conditions.

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

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Issue Info: 
  • Year: 

    2019
  • Volume: 

    18
  • Issue: 

    7
  • Pages: 

    703-720
Measures: 
  • Citations: 

    1
  • Views: 

    1282
  • Downloads: 

    0
Abstract: 

The knowledge related to the methodology of the Field trial study as a type of intervention studies, yet for many of our researchers is not fully understood. The aim of the current study was a better understanding of conducting this type of research. Field trial studies are done on healthy individuals and aim to prevent. These types of studies such as clinical trials are performed on both individual and collective levels. One type of these studies is Community Intervention Trial which is usually done on a large scale population. Field trial study should be carried out in stages, such as the formulation of hypotheses, selection of the population (reference population, study population, and sampling), measuring the baseline variables (before conducting preventive intervention), random allocation of subjects to intervention and control groups, doing interventions and measuring outcome. The methodology of Field trial studies is very similar to clinical trials. The difference is that Field trials are conducted on healthy individuals and aim to prevent and also the sample size required to this type of study is relatively more, and these studies are usually time consuming and costly.

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

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Issue Info: 
  • Year: 

    2010
  • Volume: 

    36
  • Issue: 

    1
  • Pages: 

    47-58
Measures: 
  • Citations: 

    0
  • Views: 

    1002
  • Downloads: 

    0
Abstract: 

Potential Fields are due to complex distribution of sources related to susceptibility and mass density variations for magnetic and gravity Field respectively. In researching the lateral heterogeneous of different geological bodies, in particular their edge location potential Field has some advantages. We mainly refer to linear features such as fault, folding axis, dyke, trend and border of the geological units as well as to circular featurs such as crates and buried voids when mentioning geological bodies.Usually, the edge detection and edge enhancement techniques are used to distinguish between geological bodies with different depths and sizes. Edge detection methods are based on the position of the maximum or zero-crossing points associated with vertical derivative, horizontal derivative and analytic signal filters. These methods which are famed to derivative-based filters use different orders, but some instability may occur in high-order derivatives since any kind of noise or non-harmonic signal will be correspondingly enhanced with desired signals simultaneously. Another difficulty is that in the filtered image, the smaller amplitude features (which may be of considerable importance) may be hard to discern.Other edge detection methods are local Phase filters (edge enhancement methods) based on the Phase variation of the derivative quantities. The advantage of these filters is their flexibility to produce new filters with most applicability just with partial variation. The edge enhancement methods mainly include Tilt angle (TA), Total Horizontal derivative of the tilt angle (THDR), theta map, Hyperbolic Tilt Angle (HTA) and normalized horizontal derivative.The tilt angle filter did not serve as a very accurate method of locating deep sources. A much improved result came from using the second vertical derivative of the tilt angle in the space domain. Equations (1) to (4) are the local Phase filters.T=tan-1[¶f/¶z/Ö[¶f/¶x]2+[¶f/¶y]2]THDR=Ö(¶T/¶x)2+(¶T/¶y)2Theta=cos-1[Ö(¶f/¶x)2+(¶f/¶y)2 / Ö(¶f/¶x)2+(¶f/¶y)2+(¶f/¶z)2]HTA=Â[tanh-1[¶f/¶z/Ö(¶f/¶x)2+(¶f/¶y)2]]Where, f is potential Field data, T is tilt angle and x, y, z are three Cartesian components, in the above equation Á denote real part of function.In this paper we applied these filters on synthetic magnetic data from a cylinder model as well as on real magnetic data from the Abadeh quadrangle. According to the obtained results the Dehshir-Baft fault in the northeast of the studied and ophiolite outcrops in the southeast are enhanced.

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

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Issue Info: 
  • Year: 

    0
  • Volume: 

    7
  • Issue: 

    3 (پی در پی 27)
  • Pages: 

    1-7
Measures: 
  • Citations: 

    0
  • Views: 

    3451
  • Downloads: 

    0
Abstract: 

سابقه و هدف: با توجه به نقش آنتی اکسیدانی و خواص حفاظتی ویتامینهای A و E در مقابل سرطان ارزیابی آنها از اهمیت بالایی برخوردار است. اندازه گیری این ویتامینها نیاز به روشهای دقیق و قابل اعتمادی دارد، لذا به منظور اندازه گیری دقیق همزمان ویتامین A و E با دستگاه HPLC، این تحقیق انجام گرفت. مواد و روشها: تحقیق به روش Exploratory survey انجام گرفت. پس از استخراج و آماده سازی نمونه سرمی، 50 میکرولیتر از این نمونه به دستگاه HPLC تزریق شد. روش اندازهگیری به روش کروماتوگرافی فاز معکوس با آشکار ساز (دتکتور) UV و ستون Super Pacpep-S  با سرعت جریان 1.5 (Flow rate) میلی لیتر در دقیقه و فاز متحرک متانول 95 درصد و مدت زمان آزمایش 15 دقیقه بود. زمان بازداری، درصد تغییرپذیری، تکرارپذیری، تاثیر زمان و نیز میزان بازیافت ویتامین ها اندازه گیری شد. یافتهها: ویتامین A، رتینیل استات (استاندارد داخلی) و ویتامین E به ترتیب در محدوده زمانی 3.4، 4.7 و 5/11 دقیقه از ستون خارج شدند. حد تشخیص دستگاه برای ویتامین A حدود 25 ng/ml و برای ویتامین E حدود 1 mg/ml بود. بازیافت ویتامین A و E به ترتیب 78.2 و 90.8 درصد بود. نتیجه گیری: اندازهگیری ویتامین A و E به روش HPLC همراه با تغییراتی در روشهای قبلی، روشی عملی در بالا بردن کیفیت اندازه گیری آنها به ویژه قسمت بازیافت ویتامینها است. انجام پژوهشهای دیگر برای بالا بردن کیفیت اندازه گیری ویتامینهای A و E توصیه میشود.  

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

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Issue Info: 
  • Year: 

    1386
  • Volume: 

    13
Measures: 
  • Views: 

    296
  • Downloads: 

    0
Abstract: 

ساختار (Field Programmable Nanowire Interconnect) FPNI از خانواده CMOS/Nano می باشد، که تعمیم یافته CMOL پیشنهاد شده توسط Likharev است، که با قابلیت انتخاب ابزارهای نانو، میتواند تکنولوژی بهبودیافته یک ساختار FPGA با رفع مشکلات وضعیت بیتها و ترکیبات خارج از طرح نیمه هادی و جایگزینی آن با سوئیچ های نامتغیر درInterconnect ها باشد، که این امر سبب کاهش دو مولفه سطح و توان مصرفی می شود و با افزایش بهره خروجی همراه است.در این ساختار به دلیل خواص بدی که ادوات نانو برای ساختمان سیستم های منطق بولی دارند، چالشهایی را برای قابلیت اطمینان این ساختار بوجود می آورد. پس برای کاهش محدودیت ها و نقایص ابزاری استفاده از سیستم های خود سازمانده به جای سیستم های منطق بولی پیشنهاد شده است. ایده اصلی، استفاده از شبکه های تناوبی برای تشخیص طرح های پیچیده است، که با استفاده از ارتباط پالسی بین سرعت پردازش و توان مصرفی مصالحه بوجود می آورد.

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

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Author(s): 

Zhang Wenlong | Tabiei Ala

Issue Info: 
  • Year: 

    2020
  • Volume: 

    6
  • Issue: 

    3
  • Pages: 

    373-382
Measures: 
  • Citations: 

    0
  • Views: 

    113
  • Downloads: 

    142
Abstract: 

The Phase Field method integrates the Griffith theory and damage mechanics approach to predict crack initiation, propagation, and branching within one framework. No crack tracking topology is needed, and complex crack shapes can be captures without user intervention. In this paper, a detailed description of how the Phase Field method is implemented with explicit dynamics into LS-DYNA is provided. The displacement Field and the damage Field are solved in a staggered approach and the Phase Field equation is solved every Nth time step (N is refered to as calculation cycle) to save computational time. An N value smaller than 1⁄ 400 of the total time step numbers is suggested. Several simulations are presented to demonstrate the feasibility of this solving scheme.

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

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Author(s): 

Amani Beni A. | GHADERI N.

Issue Info: 
  • Year: 

    2021
  • Volume: 

    50
  • Issue: 

    4 (94)
  • Pages: 

    1485-1497
Measures: 
  • Citations: 

    0
  • Views: 

    180
  • Downloads: 

    0
Abstract: 

Speed, accuracy, and power consumption of electronic devices, are important parameters that should be considered in the design and manufacturing of these devices. In this paper, a new design of modified Phase-locked loop, using Carbon Nanotube Field Effect Transistors, is proposed. Using a differential structure of the ring oscillator, the coupled noise of the power supply and the substrate is eliminated. In addition, using active inductor in the oscillator delay cells will cause a marked increase in oscillation frequency. In the presented Phase detector circuit, by using a new open loop structure, the detection speed increases significantly. This will remove the divider circuit on loop track. By removing the divider circuit, the noise of the loop will be reduced considrably. The designed circuit is implemented once in MOSFET technology using 0. 18 micrometers process and once again in 32nm process of carbon nano-tube Field effect transistors technology with 0. 9 volt power supply. The center frequency in this process is 68. 5 GHz. The value of power consumption is less than 150 nano-watts and the acquisition time is less than 10 picoseconds.

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

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