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Yaser Gholami,Mohan Gholami 대한설비공학회 2019 International Journal Of Air-Conditioning and Refr Vol.27 No.4
The adsorbent coated exchangers are the main part of adsorption refrigeration systems. Although coated exchangers are commercially available, the coating technique and the binder used are seldom revealed and left as a challenge for researchers. Dip-coating is the most commonly used coating technique. However, the variety of binders used indicates that choosing the appropriate binder is still a matter of trial-and-error. A series of experiments were performed to introduce acrylic latex emulsion (ALE) and bitumen emulsion as the new binder for coating silica-gel powder on aluminum. The results indicate coats created by both emulsion binders are stable but the bitumen emulsion keeps its stability for about 10min after mixing with water and silica-gel powder. The effect of ALE binder and water concentrations on water vapor equilibrium and desorption kinetics was investigated. The outcomes indicated that the sample containing 0.8g water/g silica-gel, 0.08g ALE binder/g silica-gel shows the fastest desorption kinetic and the minimum capacity loss. The mechanical stability of this sample was evaluated by the shear test and the pull-off test. The measured values show that the prepared laminate withstands up to 27N/cm2 shear stress and 18N/cm2 tensile stress.
A. Gholami,A.R. Moghadassi,S.M. Hosseini,S. Shabani,F. Gholami 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
In this research (polyvinyl chloride-blend-cellulose acetate/iron oxide nanoparticles) nanocomposite membranes were prepared by casting technique to lead removal from wastewaters. The effect of blend ratio of polymer binder (PVC to CA) and Fe3O4 nanoparticles concentration on physico-chemical characteristics of membranes were studied. Water permeability and ionic rejection tests, water content and mechanical properties measurements and SEM analysis were carried out in membranes characterizations. Obviously, modified membrane containing 10 wt% CA and 0.1 wt% Fe3O4 nanoparticles showed better performance in lead removal compared to other modified membranes and also pristine ones.
HUB-GA: A Heuristic for Universal Lists Broadcasting Using Genetic Algorithm
Gholami, Saber,Harutyunyan, Hovhannes A 한국통신학회 2023 Journal of communications and networks Vol.25 No.1
Broadcasting is a fundamental problem in the infor-mation dissemination area. In classical broadcasting, a messagemust be sent from one network member to all other membersas rapidly as feasible. Although this problem is NP-hard forarbitrary graphs, it has several applications in various fields. As aresult, the universal lists model, which replicates some real-worldrestrictions like the memory limits of nodes in large networks, isintroduced as a branch of this problem in the literature. In theuniversal lists model, each node is equipped with a fixed list andhas to follow the list regardless of the originator. As opposed to various applications for the problem of broad-casting with universal lists, the literature lacks any heuristic orapproximation algorithm. In this regard, we suggest HUB-GA:A heuristic for universal lists broadcasting with genetic algo-rithm, as the first heuristic for this problem. HUB-GA workstoward minimizing the universal lists broadcast time of a givengraph with the aid of genetic algorithm. We undertake variousnumerical experiments on frequently used interconnection net-works in the literature, graphs with clique-like structures, andsynthetic instances with small-world model in order to covermany possibilities of industrial topologies. We also compare ourresults with state-of-the-art methods for classical broadcasting,which is proved to be the fastest model among all. Neverthelessof the substantial memory reduction in the universal list modelcompared to the classical model, our algorithm finds the samebroadcast time as the classical model in diverse situations.
Gholami Amir,Eftekharzadeh Maraghi Masoud 대한산업공학회 2020 Industrial Engineeering & Management Systems Vol.19 No.1
One of the most interesting and challenging issues in the field of finance at the moment is high-frequency trading (HFT). This is because HFT is a relatively new issue for most of the financial markets and its activity is becoming more common all over the world. So, the study aim is to investigate the performance of an order imbalance based trading strategy in high-frequency trading. Besides, we used Multivariate GARCH models such as BEKK and DCC GARCH to estimate volatility, return and order imbalance relations. Our dataset includes stocks traded on the Tehran Stock Exchange from April 1, 2014, until March 30, 2016 (1095 trading days). Our dataset includes stocks traded on the Tehran Stock Exchange from April 1, 2014, until March 30, 2016 (1095 trading days). Also, the results of lagged return-order imbalance relations show that the percentage of positively significant lagged order imbalances is 1.00% and the percentage of negatively significant coefficients of lagged order imbalance is only 8.21% at confidence level 95% in 2016. Finally, it concluded that order imbalance is a proper measure for predicting future returns. Indeed, order imbalance could be proper measures for predicting returns in HFT.
Gholami Farkoush, Saeid,Khurshaid, Tahir,Wadood, Abdul,Kim, Chang-Hwan,Kharal, Kumail Hassan,Kim, Kyu-Ho,Cho, Namhun,Rhee, Sang-Bong Hindawi Limited 2018 Complexity Vol.2018 No.-
<P>A large number of electromagnetic transient studies have been analyzed for finding the overvoltage behavior of power system. A grounding grid of power system is so important for reducing the effect of overvoltage phenomena during a short-circuit event. Two sections are important in grounding system behavior: soil ionization and inductive behavior; this paper focuses on the inductive manner of grounding grid. The grounding grid is considered as a conductor segment; each conductor segment acts as a grounding unit. In this paper, the transient methodology is introduced to investigate the lightning effect on grounding body at each point of grounding grid in normal and optimized conditions. Genetic algorithm is applied for regular and irregular grounding grid to obtain best values of mesh size with the lower ground potential rise (GPR) as compared with the normal condition for more safety. The grounding grid is a combination of inductance, resistance, and capacitance. This model is suitable for practical applications related to fault diagnosis. Several voltages on different positions of grounding grid are described in this paper using ATP-EMTP and genetic algorithm. The computer simulation shows that the proposed scheme is highly feasible and technically attractive.</P>
On the generalized principally injective modules
Fatemeh Gholami,Zohreh Habibi,Alireza Najafizadeh 대한수학회 2024 대한수학회보 Vol.61 No.2
Some results are generalized from principally injective rings to principally injective modules. Moreover, it is proved that the results are valid to some other extended injectivity conditions which may be defined over modules. The influence of such injectivity conditions are studied for both the trace and the reject submodules of some modules over commutative rings. Finally, a correction is given to a paper related to the subject.
Mahdiyeh Gholami,Faezeh Mokhtarian,Bahram Baninasab 한국작물학회 2015 Journal of crop science and biotechnology Vol.18 No.1
Soil salinity is one of the most serious agricultural problems. There are many biological strategies by which salinity tolerance of potential crops can be increased. The ameliorative efficiency of salt priming on emergence and seedling growth was examined in black seed (Nigella sativa), a valuable medicinal herb. The seeds were soaked for 24 h at 25ºC in the dark in distilled water (control) or 1 or 2% of KNO3, CaCl2, NaCl, ZnSO4, or CuSO4. After the all treatments, the seeds were washed with distilled water and sown. Although all priming agents were effective in alleviating adverse effects of salt stress on black seed at germination stage, NaCl proved to be the most effective since the seeds primed with this salt had significantly higher germination performance than those treated with other salts or distilled water. Next to NaCl, KNO3, CaCl2, and ZnSO4 were also effective in promoting seed germination and early growth under saline conditions.