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利用择形分子筛异构化亚甲基二苯胺

Chinese Journal of Catalysis 2024年第7期62卷 124-130页

作者： sam Van Minnebruggen ka Yan Cheung Trees De Baerdemaeker Niels Van Velthoven Matthias Degelin Galahad O’Rourke Hiroto Toyoda Andree Iemhoff Imke Muller Andrei-Nicolae Parvulescu Torsten Mattke Jens Ferbitz 吴勤明肖丰收 Toshiyuki Yokoi Nils Bottke Dirk De Vos 巴斯夫股份有限公司膜分离、吸附、催化和光谱学可持续解决方案中心(cMACs) 比利时巴斯夫股份有限公司研究组德国东京工业大学纳米空间催化研究所横滨日本浙江大学化学系浙江杭州310028

亚甲基二苯胺(MDA)被广泛用作生产聚氨酯和聚异氰脲酸酯的中间体.然而,当前MDA的生产工艺在控制(4,4’/(2,4’+2,2’))异构体比例方面还存在局限.其中,4,4’-MDA被认为是最有价值的异构体.尽管2,4'-MDA在市场上也有一定的需求,但如果能... 详细信息

亚甲基二苯胺(MDA)被广泛用作生产聚氨酯和聚异氰脲酸酯的中间体.然而,当前MDA的生产工艺在控制(4,4’/(2,4’+2,2’))异构体比例方面还存在局限.其中,4,4’-MDA被认为是最有价值的异构体.尽管2,4'-MDA在市场上也有一定的需求,但如果能将其有效地转化为4,4'-MDA,将能显著提升其附加值.本文在使用苯胺的条件下,利用β分子筛等催化剂,通过双分子机制,可以选择性地将2,4'-MDA异构化为4,4'-MDA.尽管实验显示,多种酸性沸石具有较高的异构化活性,但MCM-68(具有MsE拓扑结构)的催化性能尤为出色,它不仅展现出高异构化活性,而且具有很好的选择性.MCM-68主要催化2,4'-MDA异构化为4,4'-MDA,而2,2'-MDA和低聚物的形成则可以忽略不计.本文还深入探讨了该择形作用的原因,并详细研究了酸位置在MsE分子筛孔道限制中的关键作用.

关键词：铝分布多相催化异构化亚甲基二苯胺聚氨酯择形

ChatLib:重构智慧图书馆知识服务平台

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大学图书馆学报 2024年第2期42卷 72-80页

作者：袁虎声唐嘉乐赵洗尘杨泓睿澳门科技大学资讯科技发展办公室中国澳门999078 澳门科技大学校长办公室中国澳门999078 澳门科技大学图书馆中国澳门999078

探索和理解基于ChatGPT的知识服务新业态,研究重构智慧图书馆知识服务体系,为图书馆数智转型提供新思路、新方案、新平台。基于生成式人工智能技术,搭建由智能交互层、知识服务层和知识引擎层组成的会话式知识服务平台——ChatLib,构建... 详细信息

探索和理解基于ChatGPT的知识服务新业态,研究重构智慧图书馆知识服务体系,为图书馆数智转型提供新思路、新方案、新平台。基于生成式人工智能技术,搭建由智能交互层、知识服务层和知识引擎层组成的会话式知识服务平台——ChatLib,构建起包括向量化知识组织、会话式知识发现、启发式知识推荐、辩证式细粒度阅读的会话式知识服务体系。ChatLib以其创新性的方法改变了知识理解、知识组织和知识获取方式,提供了更为便捷、准确、个性化的知识服务,深化了图书馆的服务价值和服务能力。目前,ChatLib已在澳门科技大学投入应用,其服务正在持续优化和延伸中。

关键词： ChatGPT 大语言模型智慧图书馆知识管理知识服务

Tribonacci Partition Formulas Modulo m

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Acta Mathematica sinica,English series 2010年第3期26卷 465-476页

作者： Ji■í KLA■ka Institute of Mathematics Brno University of Technology

Each Tribonacci sequence starting with an arbitrary triple of integers is periodic modulo m for any modulus m 〉 1. For a given m, the mapping between the set s of all m^3 triples of initial values and the set of their coresponding periods define a partition of the set s. In this paper we shall investigate some basic questions related to these partitions from the point of view of enumerative combinatorics.

关键词： Tribonacci sequence modular periodicity partition formulas

Evolution of Mother-to-Child HIV-1 Transmission Rate in Mali from 2009 to 2018

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Advances in Microbiology 2024年第5期14卷 256-267页

作者： Alou sanogo Mohamed Ag Baraïka Maïga Aminata Demba Koita Mahamadou Abdou Mamadou Guindo Clémentine N’Diaye Fatoumata Namoudou Traoré Abdoulaye Bagayoko Youssouf Diallo Flabou Bougoudogo Ibrehima Guindo National Institute for Public Health Bamako Mali Faculty of Pharmacy (FAPH) University of Science of Technical and Technology de Bamako Bamako Mali University Hospital Center (CHU)-Point G Bamako Mali Faculty of Medecine and Odonto-stomatology University of Science of Technical and Technology de Bamako Bamako Mali sector Unit for the Fight against AIDs Tuberculosis and Hepatitis Bamako Mali UNICEF (United Nations Children’ s Fund) Bamako Mali

Despite enormous efforts to achieve the goal of eliminating mother-to-child transmission of HIV-1, it remains a major challenge for many countries in sub-saharan Africa, particularly Mali. Our objective is to assess changes in the rate of mother-to-child transmission of HIV-1. We conducted a cross-sectional study between January 1, 2009 to December 31, 2018 (10 years) of early diagnosis activity in newborns and children born to HIV-1-positive mothers at the National Institute for Public Health (INsP). The samples came from health and referral centers in mali. All samples were received at the Laboratory of Molecular Biology at the INsP. Proviral DNA extraction was performed from a blood spot sample with a Roche DNA kit, Cobas AmpliPrep/Cobas TaqMan HIV-1 qualitative Test, V2.0 (Roche Molecular system, Inc, UsA) following the company procedures. Molecular diagnosis was performed using the same kits using an algorithm of three identical PCRs. The Epi Info version 7 software was used for data analysis with a significance threshold of 5%. A total of 10,714 samples of infants and children born to HIV-positive mothers were analyzed by PCR. Ninety-six percent of mothers were on ARV prophylaxis (AZT 3TC NVP and AZT NVP) and 60% of newborns received the same ARV prophylaxis. Of these children, 956 tested positive with an overall transmission rate of 8.92%, varying between 7.27% in 2009 and 08.01% in 2018. This rate was relatively low among children receiving prophylaxis at 2.04% and remained high for children who received breastfeeding at 5.62%. However, the transmission rate remains low for those who have benefited from mixed and artificial breastfeeding at 1.58% and 1.27% respectively. A significant proportion of children remained infected by their mothers during pregnancy, childbirth or breastfeeding. This study shows the importance of early diagnosis of HIV in children using molecular technology.

关键词： Early Diagnosis Mothers-to-Child Newborns PCR DNA HIV-1

Effectiveness of post-COVID-19 primary care attendance in improving survival in very old patients with multimorbidity:a territory-wide target trial emulation

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Family Medicine and Community Health 2024年第3期12卷 25-35页

作者： Cuiling Wei Vincent ka Chun Yan Camille Maringe Wenxin Tian Rachel Yui Ki Chu Wenlong Liu Boyan Liu Yuqi Hu Lingyue Zhou Celine sze Ling Chui Xue Li Eric Yuk Fai Wan Ching Lung Cheung esther Wai Yin Chan William Chi Wai Wong Ian Chi Kei Wong Francisco Tsz Tsun Lai Centre for safe Medication Practice and Research Department of Pharmacology and PharmacyLi Ka Shing Faculty of MedicineThe University of Hong KongHong KongHong Kong Department of Health services Research and Policy Faculty of Public Health and PolicyLondon School of Hygiene and Tropical MedicineLondonUK school of Nursing Li Ka Shing Faculty of MedicineThe University of Hong KongHong KongHong Kong school of Public Health Li Ka Shing Faculty of MedicineThe University of Hong KongHong KongHong Kong Laboratory of Data Discovery for Health(D24H) Hong KongHong Kong Advanced Data Analytics for Medical science(ADAMs)Limited Hong KongHong Kong Department of Medicine School of Clinical MedicineLi Ka Shing Faculty of MedicineThe University of Hong KongHong KongHong Kong Department of Family Medicine and Primary Care School of Clinical MedicineLi Ka Shing Faculty of MedicineThe University of Hong KongHong KongHong Kong Department of Pharmacy The University of Hong Kong-Shenzhen HospitalShenzhenPeople's Republic of China Aston Pharmacy school Aston UniversityBirminghamUK school of Pharmacy Macao University of Science and TechnologyTaipaMacao

Objectives Older individuals with multimorbidity are at an elevated risk of infection and complications from *** of post-COVID-19 interventions or care models in reducing subsequent adverse outcomes in these individuals have rarely been *** study aims to examine the effectiveness of attending general outpatient within 30 days after discharge from COVID-19 on 1-year survival among older adults aged 85 years or above with *** Retrospective cohort study emulating a randomised target trial using electronic health *** We used data from the Hospital Authority and the Department of Health in Hong Kong,which provided comprehensive electronic health records,COVID-19 confirmed case data,population-based vaccination records and other individual characteristics for the *** Adults aged 85 years or above with multimorbidity who were discharged after hospitalisation for COVID-19 between January 2020 and August *** Attending a general outpatient within 30 days of last COVID-19 discharge defined the exposure,compared to no outpatient *** outcome measures Primary outcome was all-cause mortality within one *** outcomes included mortality from respiratory,cardiovascular and cancer *** A total of 6183 eligible COVID-19 survivors were included in the *** all-cause mortality rate following COVID-19 hospitalisation was lower in the general outpatient visit group(17.1 deaths per 100 person-year)compared with non-visit group(42.8 deaths per 100 person-year).After adjustment,primary care consultations within 30 days after discharge were associated with a significantly greater 1-year survival(difference in 1-year survival:11.2%,95%CI 8.1%to 14.4%).We also observed significantly better survival from respiratory diseases in the general outpatient visit group(difference in 1-year survival:6.3%,95%CI 3.5%to 8.9%).In a sensitivity analysis for different grace period lengths

关键词： morbidity visit records

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强化高校内控管理对采购信息化建设的探讨

中国现代教育装备 2024年第5期 35-37页

作者：孙雯钦田卡上海海洋大学招投标办公室上海201306

信息化建设是高校实现采购内控管理的有效手段。剖析了高校采购在预算编制、合同管理、资产管理、从业人员管理能力、信息化建设等环节的现状,结合我校采购信息化建设经验,总结了高校在采购信息化建设中夯实内控管理采取的四大举措:注... 详细信息

信息化建设是高校实现采购内控管理的有效手段。剖析了高校采购在预算编制、合同管理、资产管理、从业人员管理能力、信息化建设等环节的现状,结合我校采购信息化建设经验,总结了高校在采购信息化建设中夯实内控管理采取的四大举措:注重调研,做好采购信息化顶层设计;引入采购人信用理念,减少采购流程节点;强化采购风险数据提醒,实施采购动态监管;搭建交流平台,促进采购人业务能力提升,可为其他高校在采购领域的信息化建设提供参考与借鉴。

关键词：高校信息化建设内控管理采购

Computational design of structured chemical products

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Frontiers of Chemical science and Engineering 2021年第5期15卷 1033-1049页

作者： Faheem Mushtaq Xiang Zhang ka Y.Fung ka M.Ng Department of Chemical and Biological Engineering The Hong Kong University of Science and TechnologyHong KongChina

In chemical product design,the aim is to formulate a product with desired *** and internal product structure are two key drivers of product performance with direct impact on the mechanical,electrical,and thermal ***,there is a keen interest in elucidating the dependence of product performance on ingredients,structure,and the manufacturing process to form the *** of product structure,particularly microstructure,is an intrinsically complex problem that involves different phases of different physicochemical properties,mass fraction,morphology,size distribution,and ***,computational methods have emerged that assist systematic microstructure quantification and *** objective of this paper is to review these computational methods and to show how these methods as well as other developments in product design can work seamlessly in a proposed performance,ingredients,structure,and manufacturing process framework for the design of structured chemical *** begins with the desired target properties and key *** is followed by computation for microstructure and then selection of processing steps to realize this *** framework is illustrated with the design of nanodielectric and die attach adhesive products.

关键词： product design performance ingredients structure manufacturing process framework structured chemical products microstructure design

分子尺度反应器动力学模型构建及在乙烯装置中的应用

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石油化工自动化 2024年第2期60卷 12-19+34页

作者：蔡荣生张卡中科(广东)炼化有限公司石化盈科信息技术有限责任公司

简述了乙烯裂解炉模型建立的各种方法，并阐述了各种建模方法的优缺点，最终指出了乙烯裂解炉反应模型构建的研发方向。对乙烯裂解原料和产品进行精细的分子表征，构建乙烯裂解炉分子反应动力学模型，通过基于分子尺度反应动力学模型的... 详细信息

简述了乙烯裂解炉模型建立的各种方法，并阐述了各种建模方法的优缺点，最终指出了乙烯裂解炉反应模型构建的研发方向。对乙烯裂解原料和产品进行精细的分子表征，构建乙烯裂解炉分子反应动力学模型，通过基于分子尺度反应动力学模型的乙烯裂解装置实时优化和仪表故障监测，实现优化控制过程自主执行，及时消除故障，最终实现基于分子模型的乙烯装置实时优化应用。通过模型应用表明：对乙烯装置全流程的实时优化和控制，实现了乙烯装置高附加值产品收率的提高和能源的有效利用，同时，可通过模型对故障仪表进行监测。

关键词：分子模拟乙烯裂解实时优化动力学模型

来源：博看期刊

Application of the Engineering-Geological Conditions in Land-Use Plans in the Petrvald Region(Czech Republic)

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Acta Geologica sinica(English Edition) 2013年第1期87卷 272-285页

作者： Marian MARsCHALKO Isik YILMAZ Martin BEDNARIK karel KUBEka Toms BOUCHAL Faculty of Mining and Geology Institute of Geological EngineeringVSB-Technical University of Ostrava Department of Geological Engineering Faculty of EngineeringCumhuriyet University Department of Engineering Geology Comenius UniversityFaculty of Natural Sciences Department of Building structures Faculty of Civil EngineeringVSB-Technical University of Ostrava Faculty of Mining and Geology Institute of Environmental EngineeringVSB-Technical University of Ostrava

The objective of this paper is to demonstrate necessity to inform relevant parties about engineering-geological conditions for various practical purposes, especially including appropriate land-use planning. However, the relationship between relevant geological information and the geological environment is vital for foundation engineering purposes, especially where demanding structures are involved. This information is most conveniently structured when accumulated information concerning engineering-geological zones is utilized. This necessarily includes knowledge of rock workability and also of the pre-Quaternary bedrock, and these characteristics were then related to the current built-up area and future development according to the land-use plans in a case study are from the Petrvald Region （Czech Republic）. The geological environment of area has been severely influenced by anthropogenic effects of deep black coal mining. Results of this research showed that future development should be founded on spoil banks, dumps, and settling basins. According to the land-use plan, this zone occupies 44.9% of the area of interest, and its materials predominantly emanate from mining in the Ostrava-karvina Coal District. For future foundation structures planned there, it is imperative to consult detailed engineering-geological study. However, attention to and reliance on this necessity is not reflected in the existing land-use plan.

关键词： Geological environment land-use plan engineering-geological zones workability of rocks,GIs Petrvald Region (Czech Republic)