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Hossein Torkaman,Ebrahim Afjei,Hossein Babaee,Peyman Yadegari 전력전자학회 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.6
In this paper a novel method of the Ant Colony Optimization algorithm for rotor position estimation in Switched Reluctance Motors is presented. The data provided by the initial assumptions is one of the important aspects used to solve the problems relative to an Ant Colony algorithm. Considering the nature of a real ant colony, it was found that the ants have no primary data for deducing which is the shortest path in their initial iteration. They also do not have the ability to see the food sources at a distance. According to this point of view, a novel method is presented in which the rotor pole position relative to the corresponding stator pole in a switched reluctance motor is estimated with high accuracy using the active and inactive phase parameters. This new method gives acceptable results such as a desirable convergence together with an optimized and stable response. To the best knowledge of the authors, such an analysis has not been carried out previously.
HOSSEIN ZEYNALI,HOSSEIN AKBARI,S. ARUMUGAM 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.23 No.-
Monodisperse 4.11 nm FePt nanoparticles were synthesized via chemical co-reduction of iron (III) acetylacetonate and platinum (II) acetylacetonate by 1,2-hexadecanediol as a reducing agent. Then through the seed mediated growth process smaller sized FePt nanoparticles are used as seeds for the growth of larger sized particles. There is no specific limitation to achieve upper size range by this method. In this work, we have successfully synthesized FePt nanoparticles up to 8.32 nm. After annealing these particles become ferromagnetic and their coercivirty increases with increasing particle sizes and reaches a maximum value of 17760 Oe for size of 8.32 nm.
Hossein Hassannejad,Ashkan Nouri,Mohammad Hossein Assari,Seyed Hani Mirfalah,Mansour Bozorg 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.3
In this study, the coating of Ni–Ni3Si nanocomposite was produced in-situ on plain carbon steel using spark plasma sinteringprocess of Ni and Si powders followed by heat treatment. Increasing Si content in the powders from 6 to 13 wt% increasedthe amount of Si in the coatings (from 5.1 to 11.8 wt%). The corrosion behavior of the coated samples in 1 M sulfuric acidsolution was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy techniques. In the 13wt% Si coating, the eutectic structure consisting of the Ni and Ni3Siphases was observed to be uniformly distributed. Ni3Sinanoparticles with an approximate size of 90 nm were obtained in the coating by heat treatment. The results showed thatpassive behavior is obtained by heat treatment due to the uniform distribution of Ni3Sinanoparticles and also the uniformdiffusion of silicon into the nickel phase. The excellent passivation results in the highest corrosion resistance in 13 wt%Sicoating after the heat treatment.
Hossein Rahmani,Reza Eslami-Farsani,Hossein Ebrahimnezhad-Khaljiri 한국섬유공학회 2020 Fibers and polymers Vol.21 No.1
This research work investigated the effects of SiO2 and ZrO2 nanoparticles type and content incorporated into anepoxy matrix on the high velocity impact behavior of carbon fiber reinforced aluminum laminates (CARALL). CARALLspecimens consisted of a 0/90/90/0 stacking sequence of a carbon-epoxy composite containing 0, 1, 3, 5 and 7 wt% of each ofnanoparticles sandwiched between two layers of aluminum 2024-T3. To observe the toughening effects of the nanoparticleson the fracture surface of the impacted CARALL, a typical field emission scanning electron microscope (FESEM) wasemployed. Impact energy absorption of CARALL was at most increased by 18 % and 12 % with the nanoparticles content of5 wt% SiO2 and 3 wt% ZrO2, respectively. Overloading of the nanoparticles content up to 7 wt% resulted in the creation ofnanoparticles aggregated sites associated with loss in the energy absorption capacity. FESEM fractography procedure alsoshowed that the crack deflection and pinning were the most recognizable toughening mechanisms exhibited by nanoparticles. Overall, the controlled addition of SiO2/ZrO2 rigid nanoparticles to CARALL was found to be a promising method forimproving the high velocity impact energy absorption of CARALL.
PREVENTION OF SINTERING DURING ANNEALING PROCESS OF FePt NANOPARTICLES COATED WITH ZnO SHELL
HOSSEIN ZEYNALI,HOSSEIN AKBARI,S. ARUMUGAM,ZOHREH CHAMANZADEH,G. KALAISELVAN,REYHANEH KARIMI GHASABEH 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2012 NANO Vol.7 No.6
Monodispersed 4.1 nm FePt nanoparticles with narrow size distribution were successfully synthesized by the chemical polyol process with co-reduction of Fe(acac)3 and Pt(acac)2 in the presence of 1,2-hexadecanediol as a reducing agent. To achieve hard ferromagnetic behavior with L10 phase and face center tetragonal (fct) structure, high temperature annealing is performed. Annealing causes the surfactant surrounding particles to decompose and agglomeration of particles occurs. In the present work, chemically synthesized FePt nanoparticles were coated with nonmagnetic ZnO oxide shell to prevent them from sintering. Coercivity of FePt and FePt/ZnO nanoparticles increases from 5 kOe to 10 kOe and 1.8 kOe to 6 kOe respectively, with the increasing annealing temperatures from 650 to 750?C.
Hossein Kishani Farahani,Howard Bell,Seyed Hossein Goldansaz 한국응용곤충학회 2012 Journal of Asia-Pacific Entomology Vol.15 No.4
The carob moth, Ectomyelois ceratoniae (Lepidoptera: Pyralidae), is the most important pest of pomegranate orchards (in terms of economic damage) within Iran, and hence, several control procedures, including biological methods of control, have been attempted as a means of controlling populations of this insect. This research was carried out in order to study the biology of Apanteles myeloenta (Hymenoptera: Braconidae), a larval parasitoid of the carob moth. Laboratory studies were conducted to determine larval developmental time, adult longevity, sex ratio, parasite progeny production, and host stage preference of A. myeloenta. At 25±1 °C, immature developmental time (egg to pupa; mean±SE) was 28.33±0.85 days and 27.46±0.37 days for male and females, respectively. Adult females survived on average 17.5±0.14, 11.7±0.22,3.4±0.18, and 2.8±0.12 days at 25 C when provided with honey and water, honey only, water only or no food source, respectively. The sex ratio (females to males) of A. myeloenta was 1:3.5 from hosts parasitized in the first instar, 1:3 for second instars and 1:2 for third instar carob moth larvae. Female A. myeloenta typically preferred to parasitize second instar over third or first instar. The oviposition activity peaked on the 7th and 8th days following emergence, when provided with honey, and 10% sucrose solution, respectively
Hossein Khosravi,Hossein Bahrainy,Shadi Omidvar Tehrani 서울시립대학교 도시과학연구원 2020 도시과학국제저널 Vol.24 No.3
In this paper, the neighbourhood’s morphology has been evaluated according to socio-behavioural aspects and sense of place. It seems that place attachment, social bonding, and total time residents spent in local spaces are highly determined by neighbourhood’s socio-behavioural dimensions, and in turn, neighbourhood’s morphological attributes have a great impact on socio-behavioural dimensions. To verify the hypothesis, 843 participants have been selected through Neyman allocation modelling from 5 morphologically representative neighbourhoods. The built-environment attributes were gathered through an objective method (GIS). Sense of place, meantime residents, spent in public spaces, socio-behavioural indicators, and a number of socio-demographic characteristics were collected by self-administered questionnaires. According to our analysis, high and middle-rise neighbourhoods, with low coverage massing, by providing plenty of wide, non-hierarchical, and inter-connected spaces, could ensure personal privacy, anonymity, and consequently autonomy, genuineness, and tendency to use neighbourhood spaces. In contrast, historic organic neighbourhoods with narrow hierarchical pathways and massing alongside them increase the level of social monitoring and conformity. Thus, policies that support mixed-use, connected street networks, plenty of shared open spaces, non- hierarchical network patterns, and smaller block sizes can be used by urban designers to promote neighbourhoods supporting residents’ psycho-social preferences.
Intrinsic kinetics of the Fischer-Tropsch synthesis over an impregnated cobalt-potassium catalyst
Hossein Atashi,Mohsen Mansouri,Seyyed Hossein Hosseini,Mohammad Khorram,Ali Akbar Mirzaei,Masoud Karimi,Ghobad Mansouri 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.3
The optimal amount of 15 wt%Co/10 wt%K/Al2O3 catalyst was prepared using the impregnation technique in order to study the kinetics of the Fischer-Tropsch synthesis. The rate of synthesis was measured in a fixed-bed micro reactor with H2/CO feed ratio of 1-3 and space velocity in the range of 2,700-5,200 h−1 under reactor pressure of 8 bar and a temperature range of 210-240 oC. The experimental data were best fitted by a Langmuir-Hinshelwood-Hougen-Watson (LHHW) approach rate in the form of −rCO=(k2K1PCOPH2)/(1+K1PCO). Furthermore, the data were fitted fairly well by a power law equation in the form of −rCO=kPCO 1.32PH21.42. The activation energies for LHHW approach model and power law equation were obtained as 138.5 kJ/mol and 87.39 kJ/mol, respectively.