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نتیجه جستجو - شبیه سازی

تعداد مقالات یافته شده: 530
ردیف عنوان نوع
1 Differential shedding: A study of the fiber transfer mechanisms of blended cotton and polyester textiles
ریختن دیفرانسیل: مطالعه مکانیسم های انتقال فیبر پارچه های مخلوط پنبه و پلی استر-2020
One of the primary interests of forensic sciences is the study of traces, better conceived as silent witnesses to criminal activity whose existence is attributable to Locard’s principle. Thus, textile fibers are commonly exploited as they are easily transferred during contact which can vary in intensity depending upon the type of activity that occurred. Regardless, current knowledge pertaining to fiber transfer mechanisms, particularly in regards to blended textiles, is limited. It is recognized that the intensity of the contact, the type of textile as well as the size and type of fibers composing it have a significant influence on the amount of fibers transferred. However, when the donor textile is blended (eg. 50% cotton, 50% polyester), it often happens that one of the two types of fibers is transferred in greater proportion to the receiving surface (eg. 80% cotton and 20% polyester). The percentages indicated on the manufactured label are however not representative of the respective proportions (based on the number of fibers) of each type of fiber composing the fabric, but rather the weight of each respective type of fiber used to fabricate the garment. Therefore, the amount of collected fibers (traces) cannot be easily correlated to the proportions indicated on the manufactured label used to describe the textile. The objective of this study was to test the transfer capacities of blended textiles of different cotton and polyester proportions by performing several simulations under controlled conditions (i.e. contact between two textiles with a constant force and speed). The results were then correlated to the fiber type, morphology, and size. Overall, the project contributes to improving the comprehension of fiber transfer mechanisms, and provides insight on the quantity and the proportions of fibers capable of being transferred between the donor and the recipient textiles following a specific type of action and contact (legitimate or otherwise).
Keywords: Blended textiles | Textile characteristics | Shedding capacity | Primary transfer simulation | Fiber proportions
مقاله انگلیسی
2 Recovery & identification of human Y-STR DNA from immatures of chrysomya albiceps (Diptera: Calliphoridae). Simulation of sexual crime investigation involving victim corpse in state of decay
ترمیم و شناسایی DNA Y-STR انسانی از ناخالصی های کریسومیا آلبیسپس (Diptera: Calliphoridae). شبیه سازی تحقیقات مربوط به جرم و جنایات مربوط به جسد قربانی در حالت پوسیدگی-2020
The number of sexual crimes in Brazil, as in several other countries, is very high. In many of these crimes the women raped are murdered and their bodies are found days later, in an advanced state of decomposition, with intense cadaverous fauna. Forensic Entomology studies insects and other arthropods that can be used in the expert analysis of various types of crimes. Diptera, the order of insects that comprises the two-winged or true flies, represents one of the largest known groups of insects and is the principal source of cadaveric entomofauna. Members of its Calliphoridae family are observed in cadavers in all phases of decomposition. The retrieval and identification of human Y-STR DNA from the gastrointestinal tract of Calliphoridae species Chrysomya albiceps maggots and pupae can provide a good tool for the gathering of evidence in sexual crime investigations involving rape and death, in which the abandoned victims body is found in a putrefied state. In this study, the animal model used was a female pig, Sus scrofa, which was sacrificed in a forested area with three shots from a 0.40 calibre Taurus pistol, and inoculated with semen to its anal and vaginal regions, simulating rape and homicide. During decomposition, 20–80 maggots were collected every 24 h and preserved in 70 % alcohol, totalling 289 maggots and 157 pupae (446 immatures) over a period of 14 days (336 h) of decomposition. Each maggot was then dissected for removal of the digestive tract, which was placed in extraction buffer. The molecular phase proceeded with extraction, quantification, amplification and capillary electrophoresis of samples, testing 16 STR loci of the Y chromosome. It was possible to establish a partial Y-STR DNA profile, with the amplification of up to eight sites, by considering a combination of the samples taken at hours 144 h, 168 h, 192 h, 216 h, 240 h, 288 h, 312 h and 336 h..
Keywords: Forensic entomology | Forensic genetics | Sex crimes | Rape | Murder | Criminal profiling
مقاله انگلیسی
3 Shielding analysis of the SPES targets handling system and storage area using the Monte Carlo code FLUKA
تجزیه و تحلیل محافظ از سیستم کنترل و اهداف ذخیره سازی APES با استفاده از کد مونت کارلو FLUKA-2020
The SPES project (Selective Production of Exotic Species) is currently under advanced construction phase at the INFN-LNL (Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro) for the production of Radioactive Ion Beams. Several typologies of target systems will be used in different SPES production phases. The irradiated target system has a limited lifetime and has to be regularly replaced. As a consequence, the handling and the temporary storage of exhausted radioactive targets are a major concern for the management of the entire facility. Monte Carlo simulation codes as FLUKA and MCNPX are used for shielding design. Results of shielding simulations are here presented, realized using a complete FLUKA model of the system and multi-step simulations. In particular, two case studies are discussed, referring to the management of different phases of the SPES project which require human intervention. The results allow some conclusions about the safe design of shieldings to be drawn.
Keywords: Monte Carlo simulation | Radioactivity | Shielding
مقاله انگلیسی
4 شدت و پتانسیل انتقال کرونا در کره جنوبی
سال انتشار: 2020 - تعداد صفحات فایل pdf انگلیسی: 6 - تعداد صفحات فایل doc فارسی: 14
اهداف: ازآنجایی که اولین مورد کروناویروس جدید 2019(کوید-19) در 20 ژانویۀ 2020 در کرۀ شمالی شناسایی شد، تعداد موارد به سرعت افزایش یافت به طوری که تا 6 مارس 2020، منجربه ابتلای6284 مورد و فوت42 نفر شد. اولین تحقیق درمورد گزارش تعداد تکثیر کوید-19 در کرۀ جنوبی را برای بررسی سرعت شیوع بیماری، ارائه می دهیم.
روش کار: موارد روزانۀ تأیید شدۀ کوید-19 در کرۀ جنوبی از منابع عمومی موجود استخراج شد. با استفاده از توزیع تجربی گزارشات دارای تأخیر و شبیه سازی مدل رشد کلی، تعداد تکثیر مؤثر را برمبنای توزیع احتمال گسستۀ فاصلۀ زایشی ارزیابی کردیم.
نتایج: چهار گروه اصلی را شناسایی و تعداد تکثیر را 1.5(1.6-1.4 CI: 95%) برآورد کردیم. به علاوه، نرخ رشد طبیعی 0.6 (0.7، 0.6 CI: 95%) و مقیاس بندی پارامتر رشد 0.8 (0.8،0.7 CI: 95%) برآورد شدند، که نشان-دهندۀ پویایی رشد زیر نمایی کوید-19 می باشد. نرخ مرگ و میر موارد خام در بین مردان (1.1%) در مقایسه با زنان (0.4%) بیشتر است و با افزایش سن افزایش می یابد.
نتیجه گیری: نتایج ما انتقال پایدار اولیۀ کوید-19 در کرۀ جنوبی را نشان می دهد و از اجرای اقدامات فاصله گذاری اجتماعی برای کنترل سریع شیوع بیماری حمایت می کند.
کلمات کلیدی: کروناویروس | کوید-19 | کره | تعداد تکثیر
مقاله ترجمه شده
5 کنترل توان سیستمهای انرژی هیبریدی با منابع تجدیدپذیر (بادی/ قدرت زای نوری) با استفاده از راهبرد سیستمهای تبدیل یافته
سال انتشار: 2020 - تعداد صفحات فایل pdf انگلیسی: 7 - تعداد صفحات فایل doc فارسی: 24
این مقاله یک راهبرد نوین برای کنترل توان خروجی یک سیستم انرژی هیبریدی متشکل از منابع انرژی تجدیدپذیر (باد و قدرت زای نوری)، یک بانک باتری و یک بار متغیر ارائه می کند. با تولید یک راهبرد مدیریت انرژی، سیستم انرژی هیبریدی دراینجا به عنوان یک سیستم غیرخطی تبدیل یافته با پارامترهای نامشخص توصیف می شود. سپس یک راهبرد کنترلی سازگار برای برآوردن نیاز توان کل در شرایط مختلف تحت تبدیل اختیاری پیشنهاد می شود. قانون کنترلی پیشنهاد شده بدون نیاز داشتن به سنجش های بادی، فقط بستگی به سرعت زاویه ای و جریان دارد. اثبات پایداری تحلیلی برمبنای روش رایج تابع لیاپونوف ارائه می شود. نتایج شبیه سازی نیز برای نشان دادن عملکرد روش پیشنهادی برای یک سیستم انرژی هیبریدی نمونه، ارائه شده و مورد بحث قرار می گیرد.
مقاله ترجمه شده
6 AI- modelling of molecular identification and feminization of wolbachia infected Aedes aegypti
مدل سازی هوش مصنوعی شناسایی مولکولی و مونی سازی wolbachia infected Aedes aegypti-2020
Background: The genetic control strategies of vector borne diseases includes the replacement of a vector population by “disease-refractory” mosquitoes and the release of mosquitoes with a gene to control the vectors reproduction rates. Wolbachia are common intracellular bacteria that are found in arthropods and nematodes. Wolbachia infected male mosquitos have been used in different experimental trials around the world to suppress the target population of Aedes aegypti and this genetic control strategy has proved to be a promising alternative to other treatment strategies. Due to certain limitations, the successful application of this strategy is still awaited. Methods: Mathematical frame work for Wolbachia induced genetic control strategy has been developed in this article. With the aid of Artificial Intelligence (AI) tools, accurate parametric values are depicted. For the first time, the model is well synchronized with the experimental findings. The model is comprised of the generalized varying coefficient and multiple mating rates between infected and uninfected compartments of Aedes aegypti dengue to forecast the disease control. Results: Two mathematical models are developed in this article to demonstrate different mating rates of the genetic control strategy. The important parameters and time varying coefficients are well demonstrated with the aid of numerical computations. The resulting thresholds and forecasting may prove to be a useful tool for future experimental studies. Conclusions: From our analysis, we have concluded that the genetic control strategy is a promising technique and the role of Wolbachia infected male mosquitos, in genetic control strategies, can be better interpreted in an inexpensive manner with the aid of a theoretical model.
Keywords: Dengue reproduction inhibition | Genetic control | Dynamical analysis | Kinetic modelling | Numerical simulations
مقاله انگلیسی
7 CFD data based neural network functions for predicting hydrodynamic performance of a low-pitch marine cycloidal propeller
توابع شبکه عصبی مبتنی بر داده های CFD برای پیش بینی عملکرد هیدرودینامیکی یک پروانه سیکلوئید دریایی کم فشار-2020
Today, various types of propulsion systems are used in different purpose ship types. Marine cycloidal propeller (MCP) is one of these propulsion systems, which has been designed for ships that require high maneuverability. MCP can be considered as an especial type of marine propulsion systems, since it produces the thrust force which is perpendicular to propeller axis of rotation. The magnitude and direction of the thrust force can be adjusted by controlling the pitching angle of the blades, so no separate rudder is needed to manoeuvre the ship. In this study, mathematical functions for predicting the open water hydrodynamic performance of a low-pitch MCP are presented by training a neural network based on computational fluid dynamics (CFD) data. For this purpose, the four nondimensional parameters of blade number (Z), ratio of blade thickness to MCP diameter (t/D), pitch (e) and advance coefficient (λ) are considered as input variables, whereas the hydrodynamic coefficients of thrust (Ks) and torque (Kd) are considered as targets. CFD simulations are performed for different cases of MCP with different combinations of Z, t/D, e and λ. The results showed that a two-layer feedforward network with one hidden layer of sigmoid neurons and at least 4 neurons in the hidden layer can be well trained by CFD data in order to obtain functions with good accuracy in predicting Ks and Kd coefficients of a low-pitch MCP.
Keywords: Marine cycloidal propeller | Hydrodynamic performance | CFD simulation | Neural network | Predictive function
مقاله انگلیسی
8 Dynamic occupant density models of commercial buildings for urban energy simulation
مدلهای چگالی اشغال پویا ساختمانهای تجاری برای شبیه سازی انرژی شهری-2020
The number of occupants and its changing pattern over time are key information for building and urban energy simulation. However, the commonly used assumption and simplification of a fixed occupancy schedule does not reflect the complicated reality, leading to significant errors in energy simulation. Therefore, dynamic occupant density models which describe the real-world situation more accurately should be developed. This paper presents a methodology to develop such a model for commercial buildings and expand it from the building level to urban level. First, a total of 2275 commercial buildings in Nanjing, a major city in China, are identified and classified into three sub-categories using Points of Interest and logistic regression. Then field measurement is conducted to obtain the hourly occupant density for 12 sample commercial buildings. The building-level dynamic occupant density model is developed by fitting normal distribution functions into the measured data. Finally, transportation accessibility and population level, two urban parameters, are defined and used to expand the buildinglevel occupant density model to the urban-level one. The dynamic urban-level occupant density model is verified for all three sub-categories of commercial buildings and the overall results are acceptable.
Keywords: Big data | Commercial buildings | Urban-level | Dynamic occupant density models
مقاله انگلیسی
9 The impact of a limited budget on the corrective action taking process
تأثیر بودجه محدود در فرآیند اقدامات اصلاحی-2020
The main goal of project control is to identify the deviations between the baseline schedule and the actual progress of the project by measuring the project performance in progress and using the project control methodologies to generate warning signals that act as triggers for corrective actions to bring the project back on track. To that purpose, tolerance limits are set on the required project performance, such that if the warning signals exceed these limits, they should result in appropriate corrective actions. In this paper, the Earned Value Management (EVM) control method and its extensions are used to test their abilities in taking corrective actions under a budget constraint. More precisely, four different approaches are proposed for allocating the limited budget along the different project phases, and whether a proper allocation of the budget results in an increase of the expected project outcome is measured. A large computational experiment is conducted on a set of artificial projects to assess the efficiency and effectiveness of the budget allocation models. Results show that simply allocating budget according to the time accrue of projects performs better than methods that take cost, time/cost or risk information into account. Moreover, results indicate that allocating a budget that increases in later stages of the project is beneficial for the outcome.
Keywords: Project management | Project control | Earned value management | Budget allocation | Simulation
مقاله انگلیسی
10 DEM simulation of dense granular flows in a vane shear cell: Kinematics and rheological laws
شبیه سازی DEM از جریان های دانه متراکم در یک سلول برشی پره: قوانین Kinematics و رئولوژیکی-2020
The rheology ofdense granular flows is investigatedthrough discrete elementmethod (DEM)simulation of a vane shear cell. From the simulation, profiles of shear stress, shear rate, and velocity are obtained, which demonstrates that the flowfeatures in the vane shear cell are equivalent to those in the classic annular Couette cell. A novel correlation for the apparent viscosity is formulated and leads to a newexpression for μKT in the kinetic theory analysis. The μKT formulation is able to qualitatively capture the μ-I relation in the shear cell. A correlation length is added in the energy dissipation termto account for the effects of the particle motion correlation. A simplified correlation length model is derived based on DEMresults and is compared with the literature. Themodified granular kinetic energy equation is able to correctly predict the granular temperature profiles in the shear cell.
Keywords: Annular Couette cell | Discrete element method (DEM) | Extended kinetic theory | Granular flow | Rheology
مقاله انگلیسی
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