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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

College & Research Libraries Pub Date : 2021-01-01 DOI: 10.22034/CRL.2020.252558.1084

L. Fekri, Maryam Nateghi

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

College & Research Libraries Pub Date : 2021-01-01 DOI: 10.22034/CRL.2020.255303.1089

D. Tayde, M. Lande

引用次数: 7

In Pursuit of My Book 追寻我的书

IF 1.8 3区管理学

College & Research Libraries Pub Date : 2021-01-01 DOI: 10.5860/crl.82.6.786

B. Geffert

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

College & Research Libraries Pub Date : 2020-11-03 DOI: 10.5860/CRL.81.7.1061

E. Glowacka, M. Kisilowska, Magdalena Paul

{"title":"Patterns of Differentiation of Students’ Competencies: A Comparative Study","authors":"E. Glowacka, M. Kisilowska, Magdalena Paul","doi":"10.5860/CRL.81.7.1061","DOIUrl":"https://doi.org/10.5860/CRL.81.7.1061","url":null,"abstract":"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.","PeriodicalId":10686,"journal":{"name":"College & Research Libraries","volume":"36 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2020-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77737372","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"管理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

College & Research Libraries Pub Date : 2020-10-30 DOI: 10.22034/CRL.2020.187273.1087

Behlol Hashemzadeh, L. Edjlali, P. D. Nezhad, E. Vessally

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

College & Research Libraries Pub Date : 2020-10-01 DOI: 10.22034/CRL.2020.110451

Mohammad Reza Jalali Sarvestani, R. Ahmadi, Behnam Farhang Rik

{"title":"Procarbazine adsorption on the surface of single walled carbon nanotube: DFT studies","authors":"Mohammad Reza Jalali Sarvestani, R. Ahmadi, Behnam Farhang Rik","doi":"10.22034/CRL.2020.110451","DOIUrl":"https://doi.org/10.22034/CRL.2020.110451","url":null,"abstract":"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.","PeriodicalId":10686,"journal":{"name":"College & Research Libraries","volume":"116 1","pages":"175-179"},"PeriodicalIF":1.8,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80248905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"管理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

College & Research Libraries Pub Date : 2020-10-01 DOI: 10.22034/CRL.2020.233886.1064

Fatemeh Maleki, Meghdad Payab, A. Baghban, H. Sheikhloie

{"title":"Determination of Fenvalerate reside in raisin via vortex-assisted surfactant-enhanced emulsiﬁcation liquid–liquid microextraction (VSLLME) method by using HPLC system","authors":"Fatemeh Maleki, Meghdad Payab, A. Baghban, H. Sheikhloie","doi":"10.22034/CRL.2020.233886.1064","DOIUrl":"https://doi.org/10.22034/CRL.2020.233886.1064","url":null,"abstract":"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%.","PeriodicalId":10686,"journal":{"name":"College & Research Libraries","volume":"232 1","pages":"161-167"},"PeriodicalIF":1.8,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77698689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"管理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

College & Research Libraries Pub Date : 2020-10-01 DOI: 10.22034/CRL.2020.231587.1059

S. Pirsa, Parisa Abdolsattari, S. J. Peighambardoust, S. H. Fasihnia, S. Peighambardoust

{"title":"Investigating microbial properties of traditional Iranian white cheese packed in active LDPE films incorporating metallic and organoclay nanoparticles","authors":"S. Pirsa, Parisa Abdolsattari, S. J. Peighambardoust, S. H. Fasihnia, S. Peighambardoust","doi":"10.22034/CRL.2020.231587.1059","DOIUrl":"https://doi.org/10.22034/CRL.2020.231587.1059","url":null,"abstract":"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.","PeriodicalId":10686,"journal":{"name":"College & Research Libraries","volume":"82 1","pages":"168-174"},"PeriodicalIF":1.8,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83774727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"管理学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

College & Research Libraries Pub Date : 2020-10-01 DOI: 10.22034/CRL.2020.238849.1070

D. O. Reddy

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

College & Research Libraries Pub Date : 2020-10-01 DOI: 10.22034/CRL.2020.242630.1075

A. Khani, Shahram Mohammadi, Hamed Rasoolzadeh

引用次数: 2