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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Information Technology Management
- نوع مقاله: Journal Article
- کلمات کلیدی: modeling,Cyber battlefield,Cyber defense,Cyber situation awareness,Cyber space simulator
- چکیده:
- چکیده انگلیسی: In order to protect cyberspace against cyber-attacks we need cyber situation awareness framework for the implementation of our cyber maneuvers. This article allows execution cyber maneuvers with dynamic cyber battlefield simulator. Cyber battlefield contains essential information for the detection of cyber events, therefore, it can be considered most important and complicated factor in the high-level fusion. Cyber battlefield by gather detail data of cyberspace elements, including knowledge repository of vulnerability, tangible and intangible elements of cyberspace and the relationships between them, can provide and execute cyber maneuvers, penetration testing, cyber-attacks injection, attack tracking, visualization, cyber-attacks impact assessment and risk assessment. The dynamic maker Engine in simulator is designed to update the knowledge base of vulnerabilities, change the topology elements, and change the access list, services, hosts and users. Evaluation of simulator do with qualitative method of research and with create a focus group.
- انتشار مقاله: 11-03-1396
- نویسندگان: AliJabar Rashidi,Mohammad Shakibazad
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Industrial Engineering International
- نوع مقاله: Journal Article
- کلمات کلیدی: Mathematical Modeling,Binary programming,Examination timetabling problem
- چکیده:
- چکیده انگلیسی: Examination timetabling problem (ETP) is one of the most important issues in universities. An improper timetable
may result in students' dissatisfaction as it may not let them study enough between two sequential exams. In
addition, the many exams to be scheduled, the large number of students who have taken different courses, the
limited number of rooms, and some constraints such as no conflict in a single student's exams make it very difficult
to schedule experimentally. A mathematical programming model is required to formulate such a sophisticated
problem. In this paper, a new binary model is developed for ETP. The novelty of the paper can be discussed in two
directions. The first one is that a course can be offered more than once in a semester. If a course is requested by a
few students, then it is enough to be offered once. If the number of students requesting a course is more than the
maximum number of students who are allowed to attend a single class, then the course is multi-offered. The
second novelty is that sharing a room for two simultaneous exams is allowed. Also, the model considers some hard
and soft constraints, and the objective function is set in such a way that soft constraints are satisfied as much as
possible. Finally, the model is applied in a sample department and is solved by GAMS- انتشار مقاله: 10-07-1399
- نویسندگان: Alireza Rashidi Komijan,Mehrdad Nouri Koupaei
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Computational Applied Mechanics
- نوع مقاله: Journal Article
- کلمات کلیدی: Ball mill,TGA,XRD,MWCNTs,Cryo-mill,Raman spectrometry
- چکیده:
- چکیده انگلیسی: Nano fillers are part of new studies to enhance various properties of fluids and solids. For example, adding nanoparticles as an enforcement in nanocomposites or as an additive to improve thermal or electrical properties in nano-fluids are of extreme importance in science and industry. There are numerous methods to uniformly disperse nanoparticles in fluid and solid phase. One of the well-used techniques is utilizing ball mills. Milling method is treated widely to uniformly disperse Carbon Nano Tubes (CNTs) in solid or fluid state materials. However, the issue is that this method abolishes some part of CNTs' structure. As a result, this defect adversely decreases the improvement of designated properties. In this research, two methods of milling conditions have been analyzed to find out their impacts on CNTs' structure. The first method is milling Multi-Wall Carbon Nano Tubes (MWCNTs) in ambient temperature. On the other hand, in the second method the temperature dwindled to -196°C by Retsch new generation ball mills (Cryo-mill). This apparatus flows liquid nitrogen (LN2) around the shaking jar and decreases the temperature as low as -196°C. To analyze the impact of these methods of milling on MWCNTs, Field Emission Gun-Scanning Electron Microscopy micrograph, X-Ray Diffraction, Raman Spectroscopy, and Thermo Gravimetric Analysis are scrutinized on MWCNTs’ structure. In conclusion, all the aforementioned experiments provide sufficient support to implicitly convince that cryo-milling method has less defective impact on initial MWCNTs.
- انتشار مقاله: 18-09-1394
- نویسندگان: Shahab Azimi,Abbas Rastgoo,Sorena Sattari,Alimorad Rashidi
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Oil and Gas Science and Technology
- نوع مقاله: Journal Article
- کلمات کلیدی: nanoparticle,Porous media,wettability alteration,Amphiphilic Nanohybrids,Enhance Oil Recovery,Pickering Emulsions
- چکیده:
- چکیده انگلیسی: In this paper, the potentials of using particles, especially nanoparticles, in enhanced oil recovery is investigated. The effect of different nanoparticles on wettability alteration, which is an important method to increase oil recovery from oil-wet reservoirs, is reviewed. The effect of different kinds of particles, namely solid inorganic particles, hydrophilic or hydrophobic nanoparticles, and amphiphilic nanohybrids on emulsion formation (which is cited as a contributing factor in crude oil recovery) and emulsion stability is described. The potential of nanohybrids for simultaneously acting as emulsion stabilizers and transporters for catalytic species of in situ reactions in reservoirs is also reviewed. Finally, the application of nanoparticles in core flooding experiments is classified based on the dominant mechanism which causes an increase in oil recovery from cores. However, the preparation of homogeneous suspensions of nanoparticles is a technical challenge when using nanoparticles in enhanced oil recovery (EOR). Future researches need to focus on finding out the proper functionalities of nanoparticles to improve their stability under harsh conditions of reservoirs.
- انتشار مقاله: 30-06-1396
- نویسندگان: Alimorad Rashidi,Alireza Solaimany Nazar,Hamideh Radnia
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Mechanical Engineering Transactions of the ISME
- نوع مقاله: Journal Article
- کلمات کلیدی: Microturbine,PSO Algorithm,CHP,photovoltaic panels,LUS technique
- چکیده:
- چکیده انگلیسی: Utilizing the combined cooling, heating and power generation (CHP) systems to produce cooling, heat and electricity is growing rapidly due to their high efficiency and low emissions in commercial and industrial applications. In conventional CHP systems the deficit of the system power can be purchased from the grid. However, this system cannot be used as the standalone application. The hybrid solar micro-CHP system can be worked as a standalone system for remote areas and other places which the access to grid is hard and costly. In this paper, by using energy and economic analyses, the type and the number of the required microturbines for the specific electricity and heat load curves during a year are selected. For performing this task, maximizing the actual annual benefit of the system is considered as objective function. Then, particle swarm optimization (PSO) algorithm and local unimodal sampling (LUS) technique is developed to calculate the type and number of prime mover and also the area of photovoltaic panels.
- انتشار مقاله: 21-11-1397
- نویسندگان: Farzan Rashidi,Halimeh Rashidi
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Biotechnology
- نوع مقاله: Journal Article
- کلمات کلیدی: Colorectal cancer,AgSk1,Cell-panning,VHH nanobody
- چکیده:
- چکیده انگلیسی: Background: Colorectal cancer is the third most common type of aggressive cancers. Chemotherapy, surgery,
and radiotherapy are the common therapeutic options for treating this cancer. Due to the adverse side-eff ects of these methods, immunotherapy is considered as an appropriate alternative therapeutic option. Treatment through the application of monoclonal antibodies is considered as a novel alternative therapeutic method for cancers. The variable fragments of the antibodies’ heavy chain or VHHs have a wide application in molecular biology and biotechnology. VHHs are compatible with the phage display technology which allows rapid and high throughput screening for antibodies isolation.
Objectives: We aimed to use naive VHH phage library to isolate a specifi c nanobody against colorectal tumor
associated antigen; the AgSK1.
Materials and Methods: In this research, naive VHH phage library was panned against two colorectal cell lines;
Ls174T and HT29 expressing diff erent levels of AgSK1 tumor associated marker. The high affi nity binders were selected and subcloned for higher expression levels of the VHH. The affi nity and specifi city of the isolated VHH were tested using ELISA. The reactivity of the VHH toward cancer cells was analyzed by competitive ELISA applying sera isolated from colorectal cancer patients.
Results: Results show that the isolated VHH recognizes and binds to the colorectal cancer cells with a high
affi nity. Moreover, the isolated nanobody is able to compete with the antibodies in the patient sera for the binding to the cancer cells.
Conclusions: Results suggest that this nanobody has a specifi c reaction toward colorectal cells and can be used for further investigation on the tumor associated antigens or production of mimotopes useful for immunotherapy.- انتشار مقاله: 17-11-1394
- نویسندگان: Seyed Khalil Rashidi,Seyed Latif Mousavi Gargari,Walead Ebrahimizadeh
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Chemistry and Chemical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: nanocatalyst,Catalytic activity,N-CNT-TiO2,Nitrogen group
- چکیده:
- چکیده انگلیسی: In this study, nitrogen-doped MWCNT-TiO2 nanocatalyst (N-CNT-TiO2) with 1, 3, and 5 wt. % nitrogen has been synthesized and its catalytic activity in the oxidation of H2S to sulfur has been studied at a temperature of 200°C and O2/H2S mole ratio of 0.5 and compared with those of neat TiO2 and TiO2-CNT hybrid. Their structure, morphology, and chemical properties have been determined by N2 adsorption-desorption isotherms, XRD, SEM, TEM, UV, and FT-IR. N-CNT-TiO2 exhibited improved performance compared with TiO2-CNT due to the presence of nitrogen groups. In addition, the nanocatalyst was comparable (up to 5%) with TiO2 because of the presence of a lower bandgap and synergistic effects. Furthermore, 5%N-CNT-TiO2 has shown the highest catalytic activity among N-CNT-TiO2 nanocatalysts due to its higher surface area and pore volume.
- انتشار مقاله: 24-11-1397
- نویسندگان: Maryam Daraee,Majid Baniadam,Ali Morad Rashidi,Morteza Maghrebi
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Chemistry and Chemical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Nanostructures,Composites,Magnetic properties,Electrical Properties,Chemical Synthesis,electronic materials,Magnetic materials
- چکیده:
- چکیده انگلیسی: We have successfully prepared Fe3O4/MWCNT nanohybrid with a very simple and economical method. Multi-Walled Carbon NanoTubes (MWCNT) encapsulated with Fe3O4 nanoparticles were synthesized via pyrolyzing of ferrocene. The sample was characterized with XRD, TEM and Vibrating Sample Magnetometer (VSM). Also, Permeability (µ) and Permittivity (ε) were measured. The reflection-loss was measured at 2-18 GHz with a HP8722ES vector network analyzer. In 2-18 GHz frequency range (microwave frequency), the dielectric loss (tan δE=ε″ / ε′ with an amount between 0.5-0.6) effectively improves via the addition of Fe3O4/MWCNT nanohybrid in the desired composite with paraffin matrix. Therefore, it can be concluded that Fe3O4/MWCNT nanohybrid has good potential to improve microwave absorption and can be used as Radar Absorbing Material (RAM).
- انتشار مقاله: 30-01-1395
- نویسندگان: Mahshad Alaei,Shahab Torkian,Mohammad Hossein Shams,Ali Morad Rashidi
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Chemistry and Chemical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Pyrazole,Pyrimidine,One-pot,Pyran,γ-Al2O3 nanoparticles
- چکیده:
- چکیده انگلیسی: g-Alumina nanoparticles (g-Al2O3 NPs) were prepared via a new and simple synthetic route and characterized by field emission scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. The catalytic activity of prepared g-Al2O3 NPs was investigated for the new one-pot, four-component synthesis of some fused tri-heterocyclic compounds containing pyrazole, pyran, and pyrimidine. In another investigation, the recyclability of the prepared nanocatalyst was also studied. It was proved that the nanoparticles can act effectively for at least four cycles without appreciable loss in activity. This novel procedure has some advantages such as high efficiency, simplicity, high rate, and environmental safety.
- انتشار مقاله: 14-09-1394
- نویسندگان: Sajad Kiani,Saeid Khodabakhshi,Alimorad Rashidi,Ziba Tavakoli,Sadegh Dastkhoon
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Chemistry and Chemical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Response surface methodology,Hydrogenation,Fullerene,Aniline,Ruthenium,Nitrobenzene
- چکیده:
- چکیده انگلیسی: In this study fullerene functionalized using oleum (H2SO4·SO3), followed by the hydrolysis of the intermediate cyclosulfated fullerene as well as an oxidizing agent was employed to functionalize the fullerenes. Ruthenium was then added by the impregnation method or deposited on the functionalized fullerene. Subsequent to this step, Response Surface Methodology (RSM) was used to study the cumulative effect of various parameters including, pressure, temperature, time and loading. In order to maximize the hydrogenation of nitrobenzene (NB) to aniline (AN) these latter parameters were optimized. Furthermore, catalytic activity was evaluated over a temperature range of 25–150°C, hydrogen pressure of 1-30 atm, ruthenium content of 1-15%(w/w) and reaction time of 30-180 min in a bench scale reactor. The optimized model predicted that the hydrogenation should be at a maximum level (approximately 100%) with the following conditions; Ru loading of 15%, reaction temperature of 150 °C, reaction time of 180 min and hydrogen pressure of 22.33 atm.
- انتشار مقاله: 26-04-1392
- نویسندگان: Hassan Keypour,Mohammad Noroozi,Alimorad Rashidi,Masoud Shariati Rad
- مشاهده