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81.
82.
In this paper,the Coulomb collisional efect of electron-ion on the growth rate of Weibel instability is investigated based on the semi-relativistic Maxwellian distribution function in dense and unmagnetized plasma.An analytical expression was derived for the dispersion relation of Weibel instability for two limit cases|ξ=ω′/k|| T|||≥1 and |ξ|≤1.In limit|ξ|≥1 the dispersion relation only includes a real part and in limit|ξ|≤1 the imaginary part of the frequency of waves’instability plays a role in the dispersion relation.In limit≤|ξ|1,the two quantitiesμandη,that are due to the relativistic and collisional efects,will appear in the growth rate of Weibel instability.The growth rate of Weible istability will be increased through decreasing the Coulomb collisional frequency and also increasing the temperature anisotropic parameter in strong relativistic limit. 相似文献
83.
A magnetically heterogeneous CoFe2O4@SiO2-NH2-CoII nanoparticle was synthesized by the immobilization of Co (II) complex onto CoFe2O4@SiO2 nanoparticles, and the heterogeneous magnetic nanocatalyst was characterized by XRD, TEM, TGA, EDX, and FT-IR techniques. Then, the green and reusable method was introduced for a multicomponent synthesis of 1,4-dihydropyridine derivatives via Hantszch reaction. The synthesis of 1,4-dihydropyridine derivatives was proceeded by the reaction of aldehyde, ethyl acetoacetate, and ammonium acetate in the presence of this magnetic nanocatalyst in EtOH/Water (1:1). Simple work-up, short reaction times, excellent yields (60–96%) as well as green solvent are some advantages of this novel approach, and the corresponding products were purified with no need for chromatographic separation. 相似文献
84.
85.
Mina Saeedi Shirin Ansari Mohammad Mahdavi Reyhaneh Sabourian Tahmineh Akbarzadeh Alireza Foroumadi 《合成通讯》2013,43(20):2311-2318
A novel series of 1,2,3-triazole-dihydro[3,2-c]chromenone derivatives were synthesized through an efficient three-step reaction starting from 4-hydroxybenzaldehyde. All the newly synthesized compounds were characterized by infrared and NMR spectroscopy as well as elemental analysis and evaluated for their acetylcholinesterase inhibitory activity. 相似文献
86.
Vahideh Mahdavi Hamideh Hamidi 《International journal of environmental analytical chemistry》2013,93(14):1342-1351
ABSTRACTA fast, selective and sensitive reversed-phased liquid chromatography coupled to ion-trap mass spectrometry has been developed to elucidate and confirm the diazinon metabolites with a wide range of polarity in the rice plant samples. Sample extraction and purification were performed with a QuEChERS-based (Quick, Easy, Cheap, Effective, Rugged, and Safe) procedure. To boost all metabolism sensitivities, all rice extracts were concentrated under vacuum to near dryness and taken up into initial mobile phase. Careful optimisation of the LC–MS/MS parameters were achieved in order to attain a fast separation with the best sensitivity. The detection was carried out on an ion-trap mass spectrometer by electrospray ionisation in positive ion mode (ESI+) with multiple reaction monitoring. 相似文献
87.
Arash Shokrolahi Abbas Zali Mohammd Mahdavi 《Phosphorus, sulfur, and silicon and the related elements》2013,188(4):535-543
Abstract A simple and efficient procedure has been developed for the synthesis of benzothiazole derivatives in water by the condensation of 2-aminothiophenol with aldehydes in the presence of Sulfonated porous carbon (SPC). This method provides a simple and efficient protocol in terms of mild reaction conditions, clean reaction profiles, small quantity of catalyst, and simple workup procedure. 相似文献
88.
This study addresses an interactive multiple fuzzy goal programming (FGP) approach to the multi-period multi-product (MPMP)
production planning problem in an imprecise environment. The proposed model attempts to simultaneously minimize total production
costs, rates of changes in labor levels, and maximizing machine utilization, while considering individual production routes
of parts, inventory levels, labor levels, machine capacity, warehouse space, and the time value of money. Piecewise linear
membership functions are utilized to represent decision maker’s (DM’s) overall satisfaction levels. A numerical example demonstrates
the feasibility of applying the proposed model to the MPMP problem. Furthermore, the proposed interactive approach facilitates
the DM with a systematic framework of decision making process which enables DM to modify the search direction to reach the
most satisfactory results during solving process. 相似文献
89.
Mohammad Mahdavi Ramin Najafi Mina Saeedi Eskandar Alipour Abbas Shafiee Alireza Foroumadi 《Helvetica chimica acta》2013,96(3):419-423
Various isoindolo[2,1‐a]quinazoline‐5,11‐dione derivatives 3 were synthesized in good yields by means of the reductive reaction of N‐substituted 2‐nitrobenzamides 1 and 2‐formylbenzoic acids 2 in the presence of SnCl2?2 H2O under reflux in EtOH (Scheme, Table). The procedure needed two steps, the reduction of the nitro group of the 2‐nitrobenzamide and ring closure by nucleophilic addition of the NH2 group to both the formyl and carboxylic acid C?O groups. 相似文献
90.
Nima Taghavinia Azam Iraji-zad S. Mohammad Mahdavi M. Reza-esmaili 《Physica E: Low-dimensional Systems and Nanostructures》2005,30(1-2):114-119
A photochemical approach on the size control of CdS nanoparticles is presented. CdS nanoparticles were grown using the photo-induced reaction of sodium thiosulfate with Cadmium sulfate, in the absence of any surfactant. Particles of 5.5–11 nm were obtained by changing the illumination time. The dark growth of nanoparticles was negligible, however we found by optical scattering measurements that a ripening phenomenon occurs and the size of nanoparticles slightly increases with time. 相似文献