http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Tayebee, Reza,Cheravi, Fatemeh Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.12
Esterification is an important class of reactions in the preparation of perfumery and flavor chemicals, wherein homogeneous, solid acidic, and superacidic catalysts are normally used. Now, an efficient and selective protocol for protection of various functionalized alcohols employing carboxylic acids as protecting agents is realized through the catalytic mediation of simple heteropolyoxometallates. In this methodology, water is the only by-product and notably the aspect of effluent treatments does not arise. The advantages include the operational simplicity, recycle ability of the catalyst and mild reaction conditions. The present catalytic system may be a potential candidate not only for laboratory practice but also for commercial applications and offers an environmentally safer alternative to the existing processes.
34% 과산화 수소와 함께 알코올의 산화에서 수분-관용적인 촉매로서의 간단한 헤테로 다중산
Tayebee, Reza 대한화학회 2008 대한화학회지 Vol.52 No.1
간단한 Keggin형의 텅스텐과 몰리브덴의 헤테로 다중산인, H3PW12O40과 H3PMo12O40는 표준식수에서 34% 과산화 수소와 함께 알코올의 산화를 위한 수분-관용적인 촉매로 사용되어졌다. 우리의 실험결과에 따르면 H3PW12O40는 좋은 수율로 표준식수에서 치환을 위한 간단하고, 효과적이고, 값싼 촉매로 사용되어질 수 있다. 반응 과정 중 25-80 oC에서 다른 용매 효과와 촉매의 농도변화와 기질 또한 연구하였다. Simple Keggin type tungsten and molybdenum heteropoly acids, H3PW12O40 and H3PMo12O40, were usedas water-tolerant catalysts for the oxidation of alcohols with 34% hydrogen peroxide in normal drinking water. Accordingto our findings, H3PW12O40 may be used as a simple, effective, and cheap catalyst for this type of transformation in nor-mal drinking water with excelent yields. Efects of diferent solvents at 25-80oC and changing concentration of catalystand substrate on the reaction progress were also studied.
Reza Tayebee,Fatemeh Cheravi 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.12
Esterification is an important class of reactions in the preparation of perfumery and flavor chemicals, wherein homogeneous, solid acidic, and superacidic catalysts are normally used. Now, an efficient and selective protocol for protection of various functionalized alcohols employing carboxylic acids as protecting agents is realized through the catalytic mediation of simple heteropolyoxometallates. In this methodology, water is the only by-product and notably the aspect of effluent treatments does not arise. The advantages include the operational simplicity, recycle ability of the catalyst and mild reaction conditions. The present catalytic system may be a potential candidate not only for laboratory practice but also for commercial applications and offers an environmentally safer alternative to the existing processes.
Rafizadeh, Massoud,Tayebee, Reza,Amani, Vahid,Nasseh, Mohammad Korean Chemical Society 2005 Bulletin of the Korean Chemical Society Vol.26 No.4
Treatment of a solution of $CuCl_2$ in dimethyl phosphate (DMP) with DMSO under nitrogen atmosphere afforded to a light blue fluorescence powder. Slow evaporation of $H_2O$-DMSO solution of this powder resulted in blue-sky crystals of a new polymeric Cu(II) complex, with a unit cell composed of $Cu_2(DMP)_4$(DMSO), (1). The crystal and molecular structure of the complex acquired crystallographically. Compound (1) crystallizes in the monoclinic space group $P2_1$/n with a = 12.8920(11) $\AA$, b = 13.1966(11) $\AA$, c = 14.7926(13) $\AA$, $\alpha$ = 90$^{\circ}$, $\beta$ = 98.943(2)$^{\circ}$, $\gamma$ = 90$^{\circ}$, V= 2486.1(4) ${\AA}^3$, and Z = 4. A square pyramidal environment for the metal center was established by coordination of oxygen atoms of four bridging DMP ligands in the basal positions and binding a tri-centered oxygen atom of DMSO in the apical disposition of Cu(II). The sixth position was also affected by a weak interaction with the sulfur atom of another DMSO. The phosphorous atom in the bridging DMP was arranged in a deformed tetrahedron with (gg) conformation for methyl esters with $C_{2v}$ symmetry.
Massoud Rafizadeh*,Reza Tayebee*,Vahid Amani,Mohammad Nasseh 대한화학회 2005 Bulletin of the Korean Chemical Society Vol.26 No.4
Treatment of a solution of CuCl2 in dimethyl phosphate (DMP) with DMSO under nitrogen atmosphere afforded to a light blue fluorescence powder. Slow evaporation of H2O-DMSO solution of this powder resulted in blue-sky crystals of a new polymeric Cu(II) complex, with a unit cell composed of Cu2(DMP)4(DMSO), (1). The crystal and molecular structure of the complex acquired crystallographically. Compound (1) crystallizes in the monoclinic space group P21/n with a = 12.8920(11) Å, b = 13.1966(11) Å, c = 14.7926(13) Å, = 90o, = 98.943(2)o, = 90o, V= 2486.1(4) Å3, and Z = 4. A square pyramidal environment for the metal center was established by coordination of oxygen atoms of four bridging DMP ligands in the basal positions and binding a tri-centered oxygen atom of DMSO in the apical disposition of Cu(II). The sixth position was also affected by a weak interaction with the sulfur atom of another DMSO. The phosphorous atom in the bridging DMP was arranged in a deformed tetrahedron with (gg) conformation for methyl esters with C2v symmetry.
Modeling the Problem of Choosing an Optimal Strategy to Respond to Project Risks
Fahimeh Rezaee,Majid Sabzeparvar,Hamed Tayebee 대한산업공학회 2018 Industrial Engineeering & Management Systems Vol.17 No.4
The project risk management is a systematic process of identifying, analyzing and responding to project risks in orderto maximize results of positive events and minimize consequences of bad and negative events that can affect mainobjectives of the project. In this process, the phase of risk response is a very important phase; because the effectivenessof responses directly determines increase or decrease of the project risk. Planning risk responses is the process ofidentifying different options and actions for reducing or eliminating threats and increasing or exploiting opportunitiesrelated to objectives of the project. Therefore, in this research, a systematic approach which is a combination of fuzzymulti-objective decision-making methods and zero-one integer programming model, is proposed to select the bestsolutions for responding to project risks. Also, since project risk management process has different stages, the stagesbefore accountability phase include identifying and analyzing quality of the risks, and choosing critical risks is alsodone for accountability. Finally, in order to select the best solution for each of the critical risks, a zero-one multiobjectivemathematical model is presented in a fuzzy environment and a case study is carried out on the Khangirangas field (Shourijeh).
Amir Sasan Mozaffari Nejad,Ali Heshmati,Tayebe Ghiasvand 질병관리본부 2019 Osong Public Health and Research Persptectives Vol.10 No.4
Objectives: Aflatoxins are a category of poisonous compounds found in most plants, milk and dairy products. The present research was carried out to detect the presence of aflatoxin M1 (AFM1) in samples of milk collected from Hamadan province, Iran. Methods: Twenty five samples of ultra-high temperature (UHT) and 63 samples of pasteurized milk were collected and the amount of AFM1 was measured by an Enzyme-Linked Immunosorbent Assay method. In addition, the estimated daily intake (EDI) and hazard index (HI) of AFM1 was determined by the following equations:(EDI= mean concentration of AFM1 × daily consumption of milk/body weight; HI= EDI/Tolerance Daily Intake). Results: AFM1 was detected in 21 (84%) UHT milk samples and in 55 (87.30%) pasteurized milk samples. Seven (28%) samples of UHT and 21 (33.33%) pasteurized milk samples had higher AFM1 content than the limit allowed in the European Union and Iranian National Standard Limits (0.05 μg/kg). None of the samples exceeded the US Food and Drug Administration limit (0.5 μg/kg) for AFM1. EDI and HI for AM1 through milk were 0.107 ng/kg body weight/day, and 0.535, respectively. Conclusion: A significant percentage of milk produced by different factories in Iran (84% of UHT and 87.3% of pasteurized milk) was contaminated with AFM1. Therefore, more control and monitoring of livestock feeding in dairy companies may help reduce milk contamination with AFM1. As the HI value was lower than 1, it can be assumed that there was no risk of developing liver cancer due to milk consumption.
Ali Pourjavadi,Zahra Mazaheri Tehrani,Tayebe Shirvani,Malihe Doulabi,Ali Bumajdad 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.35 No.-
In this research, multi-walled carbon nanotubes (MWCNTs) were modified by dendritic macromonomer. Herein, polyamidoamine with acrylamide end groups was incorporated on MWCNTs. Afterwards,poly(N-isopropylacrylamide), (PNIPAM), was grafted on polyamidoamine in a facile synthesis. Then,doxorubicin as anticancer drug was loaded on this nanocarrier. The drug release was studied at belowand above the lower critical solution temperature of PNIPAM, (LCST 32 8C), 27 8C and 37 8C, respectively. At 37 8C (body temperature) the polymer shell dehydrated and the drug release increased. The profile ofdrug release was expressed by Higuchi’s equation which indicated that the drug release mechanism wasdiffusion controlled.
Pashaki, Abdolazim Sedighi,Hamed, Ehsan Akbari,Mohamadian, Kamal,Abassi, Mohammad,Safaei, Afsane Maddah,Torkaman, Tayebe Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.6
Background: Glioblastoma multiform (GBM) is a highly aggressive tumor with median survival of approximately 14 months. Management consists of maximal surgical resection followed by post-operative chemoradiation with concurrent then adjuvant temozolamide. The standard radiotherapy dose is 60Gy in 2-Gy fractions recommended by the radiation therapy oncology group (RTOG). With the vast majority of tumor recurrences occurring within the previous irradiation field and the poor outcome associated with standard therapy, regimens designed to deliver higher radiation doses to improve local control and enhance survival are needed. In this study, we report a single institutional experience in treatment of 68 consecutive patients with GBM, treated with resection, and given post-operative radiotherapy followed by concurrent and/or adjuvant chemotherapy. Results: Of the 80 patients who entered this study, 68 completed the treatment course; 45 (66.2%) males and 23 (33.8%) females with a mean age at diagnosis of $49.0{\pm}12.9$ (21-75) years. At a median follow up of 19 months, 39 (57.3%) patients had evidence of tumor progression and 36 (52.9%) had died. The median over all survival for all patients was 16 months and progression free survival for all patients was 6.02 months. All potential prognostic factors were analyzed to evaluate their effects on overall survival. Age ${\leq}50$ year, concurrent and adjuvant chemotherapy and extent of surgery had significant p values. We found lower progression rate among patients who received higher doses of radiotherapy (>60Gy). Higher radiation doses improved progression free survival (p=0.03). Despite increasing overall survival, this elevation was not significant. Conclusions: This study emphasize that higher radiation doses of (>60Gy) can improve local control and potentially survival, so we strongly advise prospective multi centric studies to evaluate the role of higher doses of radiotherapy on GBM patient outcome.