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1, 4-Diazabicyclo[2.2.2]octanium diacetate: An effective, mild and reusable catalyst for the synthesis of 2,4,5–trisubstituted imidazoles 1,4 -重氮杂环[2.2.2]辛二乙酸酯:一种合成2,4,5 -三取代咪唑的有效、温和且可重复使用的催化剂
IF 1.8 3区 管理学 Q2 INFORMATION SCIENCE & LIBRARY SCIENCE Pub Date : 2021-01-01 DOI: 10.22034/CRL.2020.252558.1084
L. Fekri, Maryam Nateghi
1, 4-Diazabicyclo[2.2.2]octanium diacetate supplies an environmentally friendly procedure for the synthesis of 2,4,5-trisubstituted imidazoles through one-pot multicomponent condensation of benzyl or benzoin and ammonium acetate with various aldehydes. These compounds were obtained in high yields and short reaction times. The catalyst could be easily recovered and reused for five cycles with almost consistent activity. All of synthesized compounds were characterized by their physical constant, comparison with authentic samples, IR, 1H NMR, 13C NMR spectroscopy and elemental analysis.
1,4 -二氮杂环[2.2.2]双乙酸辛烷提供了一种环境友好的方法,通过一锅多组分缩合合成2,4,5-三取代咪唑的苯或苯甲酸酯和乙酸铵与各种醛。这些化合物产率高,反应时间短。该催化剂易于回收,可重复使用5次,且活性基本一致。所有合成的化合物都通过物理常数、与真实样品的比较、IR、1H NMR、13C NMR谱和元素分析进行了表征。
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引用次数: 5
Synthesis of 2, 4 disubstituted 1, 5 benzodiazepines promoted by efficient Silica-Alumina Catalyst 高效二氧化硅-氧化铝催化剂催化合成2,4二取代1,5苯二氮卓类药物
IF 1.8 3区 管理学 Q2 INFORMATION SCIENCE & LIBRARY SCIENCE Pub Date : 2021-01-01 DOI: 10.22034/CRL.2020.255303.1089
D. Tayde, M. Lande
An efficient and environment friendly valuable synthon of 1, 5 benzodiazepine derivatives were synthesized having unique physical and medicinal properties. This reaction is performed by mesoporous binary mixed metal oxide SiO2-Al2O3 which is synthesized by hydrothermal method at high temperature. This mesoporous material is investigated by XRD, SEM, EDS, TEM, TPD and BET surface area. Present method offers several remarkable advantages such as non-toxic, noncorrosive and easy work-up procedure for the purification of product with non-chromatographic method, ecofriendly reaction condition.
合成了一种高效、环保、具有独特物理和药用性能的1,5类苯二氮卓类化合物。该反应是用高温水热法合成的介孔二元混合金属氧化物SiO2-Al2O3进行的。采用XRD、SEM、EDS、TEM、TPD和BET等手段对该介孔材料进行了表征。该方法具有无毒、无腐蚀、操作简便、反应环境友好等显著优点。
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引用次数: 7
In Pursuit of My Book 追寻我的书
IF 1.8 3区 管理学 Q2 INFORMATION SCIENCE & LIBRARY SCIENCE Pub Date : 2021-01-01 DOI: 10.5860/crl.82.6.786
B. Geffert
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引用次数: 0
Patterns of Differentiation of Students’ Competencies: A Comparative Study 学生能力分化模式的比较研究
IF 1.8 3区 管理学 Q2 INFORMATION SCIENCE & LIBRARY SCIENCE Pub Date : 2020-11-03 DOI: 10.5860/CRL.81.7.1061
E. Glowacka, M. Kisilowska, Magdalena Paul
The study focuses on the issue of how much information competencies are universal in the globalized, internet-connected world, and/or to what extent their perception depends on local conditions and individual needs. The aim of the project is threefold. First, it offers a comparative analysis of the information literacy skills of Polish and Spanish students, regarding both their self-assessment and belief in the importance of information literacy. Second, it focuses on differences and unique IL needs of students of courses rooted in social sciences and/or humanities. And third, due to these differences, it discusses the role of academic librarians in profiled IL training, integrated with the specific courses. Quantitative methodology was applied. The comparative study covered subgroups of humanities and social science students from Poland and Spain. Competencies in information searching, processing, evaluation, and communication/dissemination were taken into account. The results indicate some common ways of perception of valuing information competencies and major differences in assessment of IL self-efficacy. Students’ reluctance to visit libraries is another argument to enhance profiled IL training being realized in close cooperation of academic librarians and the faculty.
该研究关注的问题是,在全球化、互联网连接的世界中,信息能力在多大程度上是普遍存在的,以及/或他们的认知在多大程度上取决于当地条件和个人需求。该项目的目的有三个方面。首先,它对波兰和西班牙学生的信息素养技能进行了比较分析,包括他们的自我评估和对信息素养重要性的信念。其次,它侧重于植根于社会科学和/或人文学科课程的学生的差异和独特的IL需求。第三,针对这些差异,结合具体课程,探讨了高校图书馆员在档案型外语培训中的作用。采用定量方法。这项比较研究涵盖了来自波兰和西班牙的人文和社会科学学生的小组。在信息搜索、处理、评估和沟通/传播方面的能力被考虑在内。结果显示了信息能力评价的一些共同感知方式和信息素养自我效能评价的主要差异。学生不愿去图书馆的现象,是图书馆馆员与教师密切合作,加强形象图书馆培训的另一个理由。
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引用次数: 0
A DFT studies on a potential anode compound for Li-ion batteries: Hexa-cata-hexabenzocoronene nanographen 锂离子电池潜在负极化合物——六元二苯六并纳米石墨烯的DFT研究
IF 1.8 3区 管理学 Q2 INFORMATION SCIENCE & LIBRARY SCIENCE Pub Date : 2020-10-30 DOI: 10.22034/CRL.2020.187273.1087
Behlol Hashemzadeh, L. Edjlali, P. D. Nezhad, E. Vessally
In this work, the possible apply of a hexa-cata-hexabenzocoronene HCor as anode material was studied for Li-ion batteries (LIBs) using the B3LYP/6-31G* level. The planar structure of HCor is less stable (by about 0.243 hartree) in comparison with the twisted structure. The Li cation and neutral are suitably adsorbed high up the middle of a HCor hexagonal ring with the adsorption energy of -120.3 and -2.7 kcal/mol, respectively. The calculated specific storage capacity of HCor is 450.1 mAh/g and the great cell voltage is 2.63 V generated by the interaction between Li+ and HCor. The HCOR is considered an ideal candidate to be used as an anode material in LIBs because of high storage capacity and ion mobility.
在这项工作中,以B3LYP/6-31G*级研究了六元六苯二苯二烯HCor作为锂离子电池(lib)负极材料的可能应用。与扭曲结构相比,HCor的平面结构稳定性较差(约0.243 hartree)。锂离子和中性离子吸附在HCor六方环的中高位置,吸附能分别为-120.3和-2.7 kcal/mol。计算得到HCor的比存储容量为450.1 mAh/g,锂离子与HCor相互作用产生的电池电压为2.63 V。由于高存储容量和离子迁移率,HCOR被认为是lib中用作阳极材料的理想候选材料。
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引用次数: 30
Procarbazine adsorption on the surface of single walled carbon nanotube: DFT studies 异丙嗪在单壁碳纳米管表面的吸附:DFT研究
IF 1.8 3区 管理学 Q2 INFORMATION SCIENCE & LIBRARY SCIENCE Pub Date : 2020-10-01 DOI: 10.22034/CRL.2020.110451
Mohammad Reza Jalali Sarvestani, R. Ahmadi, Behnam Farhang Rik
In this research, the performance of single-walled carbon nanotube (SWCN) as a sensor and nanocarrier for procarbazine (PC) was investigated by infra-red (IR), natural bond orbital (NBO), frontier molecular orbital (FMO) computations. All of the computations were done using the density functional theory method in the B3LYP/6-31G (d) level of theory The calculated negative values of adsorption energy, enthalpy changes, Gibbs free energy changes showed the PC interaction with SWCN is exothermic, spontaneous and experimentally possible. The increasing of specific heat capacity (CV) of SWCN after adsorption of PC showed the thermal conductivity improved during the interaction process and this nanostructure is an excellent sensing material for the detection of PC. The NBO results demonstrate in all of the evaluated conformers a chemical bond with SP3 hybridization is formed between the medicine and SWCN. The great values of thermodynamic constants showed the adsorption process is irreversible and SWCN is not a suitable nanocarrier for delivery of PC. The density of states (DOS) spectrums showed the bandgap of SWCN decreased sharply after the adsorption of PC and this nanomaterial can be used as a sensor for electrochemical detection of PC.
本研究通过红外(IR)、自然键轨道(NBO)、前沿分子轨道(FMO)计算,研究了单壁碳纳米管(SWCN)作为丙卡嗪(PC)传感器和纳米载体的性能。所有的计算都是在B3LYP/6-31G (d)理论水平上使用密度泛函数理论方法进行的。计算得到的吸附能、焓变、吉布斯自由能变化的负值表明PC与SWCN的相互作用是放热的、自发的和实验上可能的。吸附PC后,SWCN的比热容(CV)增加,表明在相互作用过程中,SWCN的导热性得到改善,是检测PC的优良传感材料。NBO结果表明,在所有评估的构象中,药物与SWCN之间形成了SP3杂化的化学键。热力学常数的大值表明吸附过程是不可逆的,SWCN不是一种合适的纳米载体。态密度(DOS)谱显示,SWCN吸附PC后带隙急剧减小,该纳米材料可作为PC的电化学检测传感器。
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引用次数: 31
Determination of Fenvalerate reside in raisin via vortex-assisted surfactant-enhanced emulsification liquid–liquid microextraction (VSLLME) method by using HPLC system 涡流辅助表面活性剂增强乳化液-液微萃取(VSLLME)法测定葡萄干中氰戊酸的含量
IF 1.8 3区 管理学 Q2 INFORMATION SCIENCE & LIBRARY SCIENCE Pub Date : 2020-10-01 DOI: 10.22034/CRL.2020.233886.1064
Fatemeh Maleki, Meghdad Payab, A. Baghban, H. Sheikhloie
In this project, ultra-trace amounts of Fenvalerate residue in raisin, were determined via vortex-assisted surfactant-enhanced emulsification liquid–liquid micro extraction (VSLLME) method and by using HPLC-PDA detector at 225nm. In the VSLLME method, the extraction solvent is dispersed into the aqueous samples by assistance of vortex agitator. Meanwhile, the addition of a surfactant, which was used as an emulsifier, could enhance the rate of the mass-transfer from aqueous samples to the extraction solvent. The main parameters relevant to this method were investigated and the optimum conditions were established: 20 µL chlorobenzene was used as extraction solvent, 0.9 mmol.L-1CTAB was selected as the surfactant, the extraction time was fixed at 60s, 2% sodium chloride was added and the extraction process was performed under the room temperature. Under the optimum conditions, limit of detection (LOD) was 0.3 ng mL-1. The relative standard deviation (RSD, n=6) was 2.87%. The linearity was obtained by five points in the concentration range of 0.3 to 100.0 ng mL-1. Correlation coefficients (R2) was 0.9997, and the enrichment factor (EF) was 114. Finally, the proposed method has been successfully applied for determination of Fenvalerate in real samples. The recoveries of the target analyte in raisins samples were between 84.13% and 92.12%.
本课题采用涡流辅助表面活性剂增强乳化液-液微萃取(VSLLME)法,采用HPLC-PDA检测器(225nm)对葡萄干中氰戊菊酯的超痕量残留进行了测定。在VSLLME方法中,萃取溶剂通过涡流搅拌器分散到水样中。同时,加入表面活性剂作为乳化剂,可以提高水样向萃取溶剂的传质速率。考察了该方法的主要参数,确定了最佳提取条件:以氯苯20µL为提取溶剂,浓度为0.9 mmol。选择L-1CTAB作为表面活性剂,固定提取时间为60s,加入2%氯化钠,在室温下进行提取。在最佳条件下,检出限为0.3 ng mL-1。相对标准偏差(RSD, n=6)为2.87%。在0.3 ~ 100.0 ng mL-1的浓度范围内,呈5点线性关系。相关系数(R2)为0.9997,富集因子(EF)为114。最后,该方法已成功应用于实际样品中氰戊菊酯的测定。目标分析物在葡萄干样品中的回收率为84.13% ~ 92.12%。
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引用次数: 1
Investigating microbial properties of traditional Iranian white cheese packed in active LDPE films incorporating metallic and organoclay nanoparticles 研究了用含有金属和有机粘土纳米颗粒的活性LDPE薄膜包装的传统伊朗白奶酪的微生物特性
IF 1.8 3区 管理学 Q2 INFORMATION SCIENCE & LIBRARY SCIENCE Pub Date : 2020-10-01 DOI: 10.22034/CRL.2020.231587.1059
S. Pirsa, Parisa Abdolsattari, S. J. Peighambardoust, S. H. Fasihnia, S. Peighambardoust
Iranian white Cheese is a traditional type of cheese in Iran which is popular and widely consumed because of its pleasant organoleptic properties. To manufacture this cheese, raw milk is heated below pasteurization temperature, therefore, pathogenic and spoilage bacteria remain and cause several diseases in public health. In this research three kinds of nanocomposite films based on LDPE incorporated 1) Ag, CuO, ZnO, 2) Cloisite 15A, Cloisite 20A, Cloisite 30B that produced by extrusion method were used for packaging of the cheese and kept in 4°C during 28 days. Data analysis carried out using SPSS statistical software based on a completely randomized design. The results showed the nanocomposite films incorporated with metal nanoparticles had a significant decrease in the growth of Staphylococcus aureus, coliform, mold and yeast after 28 days, while, the growth of lactic acid bacteria decreased but less than control film. Sensory properties of cheese samples packed in active films were not significantly changed. However, physicochemical characteristics such as pH and moisture content were affected significantly by active films. Overall migration of packaging active films in food simulants were within amounts allowed by national and international legislations.
伊朗白奶酪是伊朗的一种传统奶酪,因其令人愉悦的感官特性而广受欢迎和广泛消费。为了制造这种奶酪,生牛奶被加热到低于巴氏杀菌温度,因此,致病菌和腐败细菌仍然存在,并导致几种公共卫生疾病。本研究采用挤压法制备的三种纳米复合薄膜(1)Ag、CuO、ZnO, 2) Cloisite 15A、Cloisite 20A、Cloisite 30B),以LDPE为基材对奶酪进行包装,并在4℃下保存28天。数据分析采用SPSS统计软件,采用完全随机设计。结果表明,28 d后,纳米复合膜对金黄色葡萄球菌、大肠菌群、霉菌和酵母菌的生长均有显著抑制作用,对乳酸菌的生长有抑制作用,但抑制幅度小于对照膜。用活性膜包装的奶酪样品的感官特性没有明显变化。然而,活性膜对其理化特性如pH值和水分含量有显著影响。食品模拟物包装活性膜的总体迁移量在国家和国际立法允许的范围内。
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引用次数: 18
A Short Chronological Review on the Syntheses of Amine-Boranes 胺硼烷合成的简要回顾
IF 1.8 3区 管理学 Q2 INFORMATION SCIENCE & LIBRARY SCIENCE Pub Date : 2020-10-01 DOI: 10.22034/CRL.2020.238849.1070
D. O. Reddy
Since their discovery by Burg and Schlesinger in 1937, amine-boranes have enjoyed a rich preparative history and have experienced reinvigorated interest as valuable compounds. These borane complexes have been implemented in a variety of applications, spanning from reagents in organic syntheses to hydrogen storage materials. The importance of amine-boranes derives especially from their reductive abilities. Given the utility of amine-boranes and their current resurgence, a mini review on their general properties and notable preparations is both timely and potentially of interest to organic and materials chemists alike.
自从1937年伯格和施莱辛格发现胺硼烷以来,胺硼烷已经有了丰富的制备历史,并且作为有价值的化合物重新引起了人们的兴趣。这些硼烷配合物已经在各种应用中实现,从有机合成试剂到储氢材料。胺硼烷的重要性尤其来自于它们的还原能力。鉴于胺硼烷的用途和它们目前的复苏,对它们的一般性质和值得注意的制备进行简要的回顾是及时的,并且可能引起有机和材料化学家的兴趣。
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引用次数: 1
Converting polymeric mixture waste of a car breaker company to hydrocarbon by designed high performance co-pyrolysis system 利用设计的高效共热解系统,将某汽车破碎机公司废旧聚合物混合料转化为碳氢化合物
IF 1.8 3区 管理学 Q2 INFORMATION SCIENCE & LIBRARY SCIENCE Pub Date : 2020-10-01 DOI: 10.22034/CRL.2020.242630.1075
A. Khani, Shahram Mohammadi, Hamed Rasoolzadeh
Waste produced from car breaker companies severely affects the environment. So far, the only way to manage this complex waste is to bury it. In this research, the waste converted to hydrocarbons and carbon black by co-pyrolysis process in the designed high performance co-pyrolysis system. The results showed that the as-obtained maximum yield of heavy oil and light hydrocarbon wax, carbon black and non-condensable gas can be listed as mass basis of 8, 34, 3, 40 and 15%, respectively. The ratio of 5 W/W% treated expanded perlite as catalyst to waste increased the amount of light hydrocarbons to 34 W/W%.
废物产生汽车断路器公司严重影响环境。到目前为止,处理这种复杂废物的唯一方法就是将其掩埋。在本研究中,废物转化为碳氢化合物和炭黑co-pyrolysis过程的高性能co-pyrolysis系统而设计的。结果表明,获得的重油、轻烃蜡、炭黑和不凝气的最大收率分别为8%、34%、3%、40%和15%。处理后膨胀珍珠岩的催化剂用量为5 W/W%时,轻烃的收率提高到34 W/W%。
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引用次数: 2
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