检索结果-南通市图书馆

Chinese Journal of Chemical Engineering 2024年第2期66卷 40-50页

作者： Yi-Fei Liang jin-rong Lu Shang-Kun Tian Wen-Quan Cui Li Liu Hebei Provincial Key Laboratory of Environmental Photocatalytic and Electrocatalytic Materials College of Chemical EngineeringNorth China University of Science and TechnologyTangshan 063210China

For the use of green hydrogen energy,it is crucial to have efficient photocatalytic activity for hydrogen generation by water reforming of methanol under mild *** attention has been paid to gC_(3)N_(4)as a promising photocatalyst for the generation of *** improve the separation of photogenerated charge,porous nanosheet g-C_(3)N_(4)was modified with Pt nanoclusters(Pt/g-C_(3)N_(4))through impregnation and following photo-induced *** catalyst showed excellent photocatalytic activity of water reforming of methanol fo r hydrogen production with a 17.12 mmol·g^(-1)·h^(-1)rate at room temperature,which was 311 times higher than that of the unmodified g-C_(3)N_(4).The strong interactions of Pt-N in Pt/g-C_(3)N_(4)constructed effective electron transfer channels to promote the separation of photogenerated electrons and holes *** addition,in-situ infrared spectroscopy was used to investigate the intermediates of the hydrogen production reaction,which proved that methanol and water eventually turn into H_(2)and CO_(2)via formaldehyde and *** study provides insights for understanding the photocatalytic hydrogen production in the water reforming of methanol.

关键词： Water reforming of methanol Photocatalysis g-C_(3)N_(4) Pt nanoclusters Hydrogen production

Production of Functional Materials Derived from Regenerated Silk Fibroin by Utilizing 3D Printing and Biomimetic Enzyme-induced Mineralization

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第3期42卷 299-310,I0005页

作者： Ni Chen Fei-Yu Luo Gong-Wen Yang jin-rong Yao Xin Chen Zheng-Zhong Shao State Key Laboratory of Molecular Engineering of Polymers Laboratory of Advanced Materials and Department of Macromolecular ScienceFudan UniversityShanghai 200433China

Critical-sized bone defects, commonly encountered in clinical orthopedic surgery, present a significant challenge. One of the promising solutions is to prepare synthetic bone substitute materials with precise structural control, mechanical compatibility, and enhanced osteogenic induction performance, nevertheless the successful preparation of such materials remains difficult. In this study, a two-step technique,integrating an extrusion-based printing process with biomimetic mineralization induced by alkaline phosphatase(ALP), was developed. Initially,a pre-cured hydrogel of regenerated silk fibroin(RSF) with a small quantity of hydroxypropyl cellulose(HPC) and ALP was prepared through heating the mixed aqueous solution. This pre-cured hydrogel demonstrated thixotropic property and could be directly extruded into predetermined structures through a 3D-printer. Subsequently, the 3D-printed RSF-based materials with ALP underwent biomimetic in situ mineralization in calcium glycerophosphate(Ca-GP) mineralizing solution, utilizing the polymer chains of RSF as templates and ALP as a trigger for cleaving phosphate bonds of Ca-GP. The resulting 3D-printed RSF-mineral composites including hydrogel and sponge possessed adjustable compression modulus of megapascal grade and variable hydroxyapatite content, which could be controlled by manipulating the duration of the mineralization ***, these 3D-printed RSF-mineral composites demonstrated non-cytotoxicity towards rat bone marrow mesenchymal stem cells. Therefore, they may hold great potential for applications involving the replacement of tissues characterized by osteoinductivity and intricate structures.

关键词： Silk protein Alkaline phosphatase Extrusion-based printing Biomineralization

Self-adaptive gas flow and phase change behaviors during hydrate exploitation by alternate injection of N2 and CO_(2)

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2024年第3期21卷 2120-2129页

作者： Bo-Jian Cao Yi-Fei Sun Hong-Nan Chen jin-rong Zhong Ming-Long Wang Ming Wang Chang-Yu Sun Guang-jin Chen State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing102249China School of Chemistry and Chemical Engineering Changsha University of Science&TechnologyChangsha410114HunanChina

Since hydrate resources play a part of the stratigraphic framework structure in sediments,establishing a safe and economic method for hydrates exploitation remains the primary challenge to this *** the proposed methods,the spontaneous displacement of CH_(4) from hydrate cages by CO_(2) seems to be a perfect mechanism to address gas production and CO_(2) storage,especially in today's strong demand for carbon reduction and replacing clean *** extensive lab researches,in the past decade,injecting a mixture of CO_(2) and small molecule gas has become a key means to enhance displacement efficiency and has great potential for ***,there is a lack of in-depth research on gas flow in the reservoir,while the injected gas always passes through low-saturated hydrate areas with high permeability and then occurs gas channel in a short term,finally resulting in the decreases in gas production efficiency and produced gas ***,we explored a new injection-production mode of alternate injection of N2 and CO_(2) in order to fully coordinate the advantages of N2 in enhanced hydrate decomposition and CO_(2) in solid storage and heat *** alternate"taking"and"storing"processes perfectly repair the problem of the gas channel,achieving self-regulation effect of CH_(4) recovery and CO_(2) *** 3-D experimental results show that compared to the mixed gas injection,CH_(4) recovery is increased by>50%and CO_(2) storage is increased by>70%.Additionally,this alternate injection mode presented a better performance in CH_(4) concentration of produced gas and showed outstanding N2 utilization ***,we analyzed its self-adaptive gas flow mechanism and proposed an application model of"one injection and multiple production".We look forward to this study accelerating the application of CO_(2)-CH_(4) replacement technology.

关键词： Hydrate Replacement CH_(4) recovery CO_(2)storage Reservoir remediation

Revealing the Structure-Property Difference of Natural Rubber Prepared by Different Methods: Protein and Gel Content are Key Factors

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第4期42卷 457-467页

作者： Shao-Qi Huang Jun-Qi Zhang Yong Zhu Ling-Min Kong Lu-Sheng Liao Fu-Quan Zhang Zheng-Tian Xie jin-rong Wu State Key Laboratory of Polymer Materials Engineering College of Polymer Science and EngineeringSichuan UniversityChengdu610065China Hainan Provincial Key Laboratory of Natural Rubber Processing Agricultural Products Processing Research Institute of Chinese Academy of Tropical Agricultural SciencesZhanjiang524001China

Natural rubber (NR) is widely used in various fields including aerospace, military industry and transportation due to its superior elasticity and comprehensive mechanical properties. Nonetheless, the commercial NR prepared by different methods usually exhibits different mechanical properties, primarily due to variations in processing conditions during the conversion from latex to bulk rubber material. Consequently, this poses challenges in scientific research and industrial production of NR. In order to assess the properties of various commercially available NR and identify key structural and compositional components, this study systematically compares and analyzes four representative NR raw materials: air dried sheet (ADS), ribbed smoked sheets (RSS), constant viscidity NR (CV), and whole field latex rubber (WF). The investigation focuses on evaluating their static mechanical behavior, SIC behavior, wear resistance, and fatigue resistance. The findings indicate that protein and gel content exhibit a crucial influence on the NR properties. These constituents contribute to the formation of a high-crosslinking density region, generating a heterogeneous network structure within the rubber. This structure amplifies strains during deformation, leading to earlier and stronger strain-induced crystallization (SIC). Among the four commercial NR brands, RSS demonstrates superior overall mechanical and dynamic properties owing to its high protein and gel content. This study serves as a valuable reference for comprehending the differences in properties among various commercial NR, thereby offering guidance for the actual processing and selection of NR.

关键词： Natural rubber Processingmethod Protein Gel content Property

Tough Semi-interpenetrating Polyvinylpyrrolidone/Polyacrylamide Hydrogels Enabled by Bioinspired Hydrogen-bonding Induced Phase Separation

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第5期42卷 591-603,I0006页

作者： Qiong-Jun Xu Zhao-Yang Yuan Chang-Cheng Wang Hao Liang Yu Shi Hai-Tao Wu Hu Xu jing Zheng jin-rong Wu State Key Laboratory of Polymer Materials Engineering College of Polymer Science and EngineeringSichuan UniversityChengdu610065China

Semi-interpenetrating(semi-IPN)hydrogels formed by the continuous interpenetration of cross-linked polymer network and linear non-crosslinked polymer with multifunctionality are widely used in biomedical and other ***,the negative impact of linear polymer on the homogeneity of the cross-linked network often leads to a decrease in the mechanical properties of semi-IPN hydrogels and severely limits their ***,a bioinspired hydrogen-bonding induced phase separation strategy is presented to construct the tough semi-IPN polyvinylpyrrolidone/polyacrylamide hydrogels(named PVP/PAM hydrogels),including the linear polymer polyvinylpyrrolidone(PVP)and cross-linked polyacrylamide(PAM)*** resultant PVPx/PAM hydrogels exhibit unique phase separation induced by the hydrogen bonding between PVP and PAM and affected by the amount of substance of ***,the phase separation of PVPx/PAM hydrogels results in excellent mechanical properties with a strain of 2590%,tensile strength of 0.28 MPa and toughness of 2.17 MJ/m^(3).More importantly,the hydrogen bonding between PVP and PAM firstly disrupts to dissipate energy under external forces,so the PVPx/PAM hydrogels exhibit good self-recovery properties and outperform chemically cross-linked PAM hydrogels in impact resistance and damping *** is believed that the PVPx/PAM hydrogels with hydrogen-bonding induced phase separation possess more potential application prospects.

关键词： Tough Semi-interpenetrating networks Polyvinylpyrrolidone/polyacrylamide Hydrogels Phase separation

Epidemiological survey of cystic echinococcosis in southwest China:From the Qinghai-Tibet plateau to the area of Yunnan

在线全文

学校读者我要写书评

暂无评论

World Journal of Hepatology 2024年第2期16卷 229-240页

作者： jin-rong Zi Dan Xiao Jia Peng Fang-Wei Wu Jian-Xiong Li Xin-Liu Yan Zheng-Qing Wang Xuan Cai Qian Xu Ben-Fu Li Ya-Ming Yang Yunnan Provincial Center of Malaria Research Yunnan Institute of Parasitic DiseasesPuer 665000Yunnan ProvinceChina Yunnan Institute of Parasitic Diseases Yunnan Institute of Parasitic DiseasesPuer 665000Yunnan ProvinceChina Tibet Center for Disease Control and Prevention Tibet Center for Disease Control and PreventionLhasa 85000Tibet Autonomous RegionChina Yunnan Provincial Center of Malaria Research Yunnan Institute of Parasitic DiseasesPuer 655000Yunnan ProvinceChina

BACKGROUND Echinococcosis is prevalent in 9 provinces in Western and Northern *** epidemiological survey of echinococcosis in 2012 and 2016 showed cases of echinococcosis in Yunnan *** To understand the spatial distribution and epidemiological characteristics of echinococcosis in Yunnan for the prevention and control of echinococcosis and to reduce the risk of infection in Yunnan *** Based on the China Information System for Disease Control and Prevention(CISDCP),echinococcosis cases reported from 36 hospitals and 34 Centers for Disease Control were investigated and epidemiologically analyzed from 2021 to *** exclusion criteria included suspected cases,same case only counted once and cases not from Yunnan.A total of 705 cases were investigated,of which 397 cases were suitable for statistical *** these 397 cases,epidemiological investigation was tracked in 187 *** data were inputted using double entry in the Excel database,with error correction by double-entry *** data on echinococcosis cases in Yunnan Province were analyzed by ArcGIS 10.1 software to generate a density map of echinococcosis *** statistical analyses were conducted using SPSS 17.0,including the chi-square test,linear regression test and logistic univariate and multivariate regression *** A total of 397 cases were found in 89 counties in Yunnan *** number of cases in the top three prefectures were Dali(38.1%),Diqing(10.1%),and Kunming(8.3%),and the top five counties were Jianchuan(9.1%),Shangri La(8.3%),Eryuan(7.6%),Heqing(6.9%),and Dali Districts(5.0%).There were significant differences between the different *** case reporting rate by CISDCP(33.8%)was low;the first case was reported by CISDCP in 2002,and the highest number of cases was 50(2017).Confirmed and clinical cases accounted for 62.5%and 37.5%,***,90.9%of the cases of hydatid disease were reported by the hospital system,and only 9

关键词： Echinococcosis Cases Epidemiological analysis Yunnan province

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

含苝环有机半导体的光催化分解水研究进展

分子催化（中英文） 2024年第1期38卷 81-92,I0004页

作者：于卉卢金荣华北理工大学化学工程学院河北省环境光电催化材料重点实验室河北唐山063210

光催化分解水是太阳能向化学能转换的一种重要方式,其中高效稳定光催化剂的研制至关重要.具有平面共轭结构的苝类有机小分子是一类富含π电子的n-型半导体,具有结构易修饰、可见光吸收强以及光热稳定性高等优点,近年来在光催化领域研究... 详细信息

光催化分解水是太阳能向化学能转换的一种重要方式,其中高效稳定光催化剂的研制至关重要.具有平面共轭结构的苝类有机小分子是一类富含π电子的n-型半导体,具有结构易修饰、可见光吸收强以及光热稳定性高等优点,近年来在光催化领域研究广泛.我们总结了4类含有苝环结构的有机小分子苝四甲酸二酐、苝二酰亚胺、苝单酰亚胺以及苝四酸的特点.此外,从分子结构修饰、构筑聚合物、金属辅助、与其它材料复合及改变组装条件这几种方式对材料在光催化分解水方面的研究进展进行了综述,并对含有苝环结构的有机半导体材料在光催化分解水方面存在的问题和前景进行了分析和展望.

关键词：苝四甲酸二酐苝二酰亚胺苝单酰亚胺苝四酸光催化水分解

在线全文

学校读者我要写书评

暂无评论

准领属构式的实现机制

汉语学习 2024年第1期 12-24页

作者：李劲荣毛翔上海师范大学对外汉语学院上海200234

以往研究多从生成的角度讨论准定语问题,本文认为,准定语并不需要经过移位或糅合等句法操作程序生成,而是直接在领属结构形式“N_(1)的N_(2)”的基础上实现。其实现条件和机制为:当N_(2)为实体名词时结构存在实现准领属关系的可能,但需... 详细信息

以往研究多从生成的角度讨论准定语问题,本文认为,准定语并不需要经过移位或糅合等句法操作程序生成,而是直接在领属结构形式“N_(1)的N_(2)”的基础上实现。其实现条件和机制为:当N_(2)为实体名词时结构存在实现准领属关系的可能,但需要“压制”机制同时起作用,即抑制N_(2)的实体意义而凸显其属性意义,其途径是转指;而构式压制的方式是通过一系列去及物化操作使N_(2)表现为无指,从而准领属构式得以形成。

关键词：准领属构式实现机制压制转指去及物化

新时代科普绘本高质量创作创编联动“三步法”——以《了不起的中国科技》为例

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

科普创作评论 2024年第2期4卷 67-73页

作者：金蓉中国科技出版传媒股份有限公司北京100717

近年来,国家大力鼓励科技题材原创科普作品创作。2021年,国务院印发《全民科学素质行动规划纲要(2021—2035年)》强调,“支持优秀科普原创作品”,“支持面向世界科技前沿、面向经济主战场、面向国家重大需求、面向人民生命健康等重大题... 详细信息

近年来,国家大力鼓励科技题材原创科普作品创作。2021年,国务院印发《全民科学素质行动规划纲要(2021—2035年)》强调,“支持优秀科普原创作品”,“支持面向世界科技前沿、面向经济主战场、面向国家重大需求、面向人民生命健康等重大题材开展科普创作”。在少儿出版领域,一批聚焦超级工程、大国重器、科学考察等展现中国科技成果、科学家精神题材的科普绘本问世,并斩获多个奖项,得到市场热烈反响。笔者策划并参与创作的《了不起的中国科技》科普绘本(图1),围绕运载火箭、探月工程、智能高铁和南极科考4个主题,以图画故事的形式真实记录了中国有形、无形的科技力量。

关键词：科普创作图画故事少儿出版人民生命健康科普作品科技成果国家重大需求三步法

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

农业遗产地种质资源保护制度完善研究

农业现代化研究 2024年第2期45卷 188-196页

作者：孙骥孙金荣中国石油大学文法学院山东青岛266580 山东农业大学公共管理学院山东泰安271018

农业遗产地种质资源丰富,加强立法保护对维护生物多样性、保障粮食安全具有重要意义。本文采取法学与资源科学交叉的研究方法,通过实地调查与文献分析,探讨当前我国农业遗产地种质资源保护中的问题,在革新保护模式的基础上,探究保护制... 详细信息

农业遗产地种质资源丰富,加强立法保护对维护生物多样性、保障粮食安全具有重要意义。本文采取法学与资源科学交叉的研究方法,通过实地调查与文献分析,探讨当前我国农业遗产地种质资源保护中的问题,在革新保护模式的基础上,探究保护制度的完善。研究表明,我国农业遗产地种质资源保护的规范主要依据相关资源环境类法律法规,种质资源保护以采取“保护单一对象的损害应对模式”为主。然而,在管理中存在保护对象要素化、保护责任单向化、保护权限碎片化、保护政策同质化等问题。基于整体主义生态观,借鉴当代生态环境治理经验,可以引入系统性保护的方法,将种质资源保护纳入农业系统生态保护全过程,建立保护整体系统的风险治理模式。在此基础上,制定《农业文化遗产保护法》。进而,细化农民主体参与激励、联席保护、名录保护、第三方协议保护等制度的运用。最终,通过法律制度的完善,为农业遗产地种质资源保护提供规范性依据。

关键词：农业遗产地种质资源制度构建系统性保护风险治理保护法

同方期刊数据库