检索结果-南通市图书馆

Particle Distribution Informed by Chain Rigidity in Diblock Copolymer Melts: The Effect of Entropy

Chinese Journal of Polymer Science 2024年第3期42卷 388-399,I0009页

作者： yuguo Chen Shuanhu Qi Ying Jiang School of Chemistry Beihang UniversityBeijing 100191China

We study the effect of chain rigidity on tailoring the nanoparticle locations for neutral and selective particles embedded in the lamellar morphology formed by semiflexible diblock copolymer chains using self-consistent field calculations. The nanoparticles are modeled through a cavity function, and the semiflexible chains are represented by the continuous Kratsky-Porod chain model. In general situation, the nanoparticles prefer to stay at the interface in order to reduce the interface areas and thus the system free energy. However, the particle distribution at the domain center is subtle, and the underlying physics is intrinsically different depending on the polymer flexibility. In the case of flexible chains, the entropy just contributes a constant shift to the free energy when the nanoparticles move around the domain center indicating that the local metastable state if appears at the domain center is wholly attributed to the local minimum in the enthalpy. If the polymers are rigid, the variation of the particle distribution at the domain center has a close relation with the polymer rigidity and nanoparticle size. In the case of strongly rigid polymers with small nanoparticles, a nearly uniform particle distribution at the domain center is observed, while in other cases, a local enhancement of particle distribution there is found. In contrast to the case of flexible chains, further analysis reveals the crucial role of entropy in controlling the shape of particle distributions at the phase domain. Specifically, the local metastable state appears in the domain center is determined by the large entropy there which arises from the weak coupling of bond orientations that allows the polymer chains to be relatively relaxed. When the particle becomes selective, its distribution in the phase domain exhibits a shift almost uniformly rather than changes its profile, and the underlying physics still holds. In all, our study establishes a strong coupling between the chain rigi

关键词： Semiflexible diblock copolymer Nanoparticle distribution Self-consistent field theory Entropic effect

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Human Herpesvirus 6 Infection Complicated by Viral Encephalitis Following Liver Transplantation:A Case Report

引用

Infectious Microbes & Diseases 2024年第3期6卷 158-161页

作者： Kai Kou Heyu Huang Wei Qiu yuguo Chen Xiaodong Sun Guoyue Lv General Surgery Center Department of Hepatobiliary and Pancreatic SurgeryThe First Hospital of Jilin University:Bethune First Hospital of Jilin UniversityChangchunChina

Human herpesvirus 6(HHV-6)is a significant pathogen following solid organ ***,we report a 64-year-old female with cirrhosis related to nonalcoholic fatty liver disease who underwent orthotopic allogeneic liver transplantation and was ultimately diagnosed with HHV-6 encephalitis through cerebrospinal fluid analysis and *** treatment with daily ganciclovir was initiated according to characteristics indicative of viral encephalitis 3.days before confirmed *** improvement in symptoms was observed,with clearance of HHV-6 from the *** complex diagnosis and management of this case accentuate the possibility of serious consequences of HHV-6 infection in postoperative liver transplant *** must maintain a high index of suspicion for HHV-6 reactivation,especially given its association with immunosuppressive drug *** recognition and initiation of antiviral therapy are paramount,particularly when patients present with fever or psychiatric symptoms,as these may indicate HHV-6 encephalitis.

关键词： human herpesvirus 6 viral encephalitis liver transplantation

来源：

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

Systemically functional characterization of regiospecific flavonoid O-methyltransferases from Glycine max

引用

Synthetic and Systems Biotechnology 2024年第2期9卷 340-348页

作者： Bingtong Feng yuguo Jiang Xiaodong Li Yan Wang Ziyu Ren Jian Lu Xing Yan Zhihua Zhou Pingping Wang Life Science and Technology College Guangxi UniversityNanningGuangxi530004China CAS-Key Laboratory of Synthetic Biology CAS Center for Excellence in Molecular Plant SciencesChinese Academy of SciencesShanghai200032China University of Chinese Academy of Sciences Beijing100049China The College of Life Sciences Shanghai Normal UniversityShanghai200234China

Plants produce diverse flavonoids for defense and stress resistance,most of which have health benefits and are widely used as food additives and *** of the free hydroxyl groups of flavonoids,catalyzed by S-adenosyl-l-methionine-dependent O-methyltransferases(OMTs),significantly affects their physicochemical properties and ***(Glycine max)contain a rich pool of O-methylated ***,the OMTs responsible for flavonoid methylation in *** remain largely *** screened the *** genome and obtained 22 putative OMT-encoding genes that share a broad spectrum of amino acid identities(25–96%);among them,19 OMTs were successfully cloned and heterologously expressed in Escherichia *** used the flavonoids containing the free 3.5,7,8,3.,4′hydroxyl group,such as flavones(luteolin and 7,8-dihydroxyflavone),flavonols(kaempferol and quercetin),flavanones(naringenin and eriodictyol),isoflavonoids(daidzein and glycetein),and caffeic acid as substrates,and 15 OMTs were proven to catalyze at least one *** methylation activities of these GmOMTs covered the 3.7,8,3.,4′-hydroxyl of flavonoids and 7,4′-hydroxyl of *** systematic characterization of *** flavonoid OMTs provides insights into the biosynthesis of methylated flavonoids in soybeans and OMT bioparts for the production of methylated flavonoids via synthetic biology.

关键词： Flavonoids O-methyltransferases Glycine max Functional characterization

来源：

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

Enhanced piezoelectricity of Cu-doped K(Ta,Nb)O_(3. single crystals

引用

Journal of Materiomics 2024年第5期10卷 1017-1025页

作者： Fulin Zhang Songtao Fan Yingxu Zhu Wendie Chen Bing Liu yuguo Yang Limei Zheng Yuanyuan Zhang Xianshun Lv Xuping Wang Advanced Materials Institute Qilu University of Technology(Shandong Academy of Sciences)Jinan250014China Qilu University of Technology(Shandong Academy of Sciences) Advanced Materials InstituteKey Laboratory of Light Conversion Materials and Technology of Shandong Academy of SciencesJinan250014China School of Physics Shandong UniversityJinan250100China

As a class of solid solution material,K(Ta,Nb)O3.KTN)single crystals have attracted significant interest due to their excellent piezoelectric and electro-optic *** this study,the piezoelectric properties of KTN were improved through Cu *** the advantages of composition-regulating phase transition,a large,high-quality Cu:KTN crystal measuring 3. mm×25 mm×20 mm in size was grown using the improved top seeded solution growth ***-doped KTN exhibited better piezoelectric properties than pure KTN,and the full matrix parameters were *** dielectric,piezoelectric,and electromechanical coupling responses(ε^(T)_(11)-2,13.,d_(3.)∼3.3.pC/N,k_(t)∼0.515,and k3.∼0.672)were successfully *** realize the optimized orientation of the piezoelectric properties,the orientation dependence of the single domain properties was investigated,and the mechanism of Cu doping to improve piezoelectric properties was *** found that 0.3.%(in mass)Cu doped crystal consisted of A-site substitution,following ferroelectric and domain *** small ferroelectric domain sizes led to a large domain wall mobility rate and high domain wall density,which contributed to high piezoelectric *** work revealed the effect of A-position doping on piezoelectric properties and provided a theoretical and experimental foundation for the performance optimization of KTN-based materials.

关键词： Solid solution material Lead-free piezoelectric Enhanced piezoelectricity

来源：

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

A subspace analysis method combining cointegration analysis and dynamic latent variables for non-stationary process fault detection

A subspace analysis method combining cointegration analysis ...

引用

第3.届中国过程控制会议

作者： Keyu Yao yuguo Yang Hongbo Shi School of Information Science and Engineering East China University of Science and Technology

In the field of fault detection, changes in the normal state of certain parameters due to changes in actual operating conditions are very similar to those caused by faults. This results in certain normal process changes being misrecognized as process abnormalities, while certain process abnormalities that actually occur are masked by normal process changes. In order to solve the above problems, a subspace analysis method based on cointegration analysis and dynamic latent variables subspace analysis(CA-DLVSA) is proposed in this work. First, the process variables in the real industrial process are categorized into non-stationary and stationary variables using the ADF test. Second, the variables determined to be static are divided into the dynamic stationary subspace and static stationary subspace using the DLV model. For variables judged to be non-stationary, the non-stationary subspace is further divided into the dynamic stationary and static non-stationary subspace using an algorithm that combines CA and DLV. Then, the dynamic stationary spaces obtained from the stationary and non-stationary data are then combined to form the final dynamic stationary space and the static stationary portion of the stationary data is retained to form the final static stationary space. Finally, the corresponding statistics are constructed for process monitoring in both spaces. In three-phase flow process, the excellent performance of the proposed method in non-stationary process monitoring is verified by comparing the DLV, SFA, CVA, CA-DLVSA methods.

关键词： Cointegration analysis Dynamic latent variables Process Monitoring Non-stationary process

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

A novel predictor of unsustained return of spontaneous circulation in cardiac arrest patients through a combination of capnography and pulse oximetry: a multicenter observational study

引用

World Journal of Emergency Medicine 2024年第1期15卷 16-22页

作者： Jing Yang Hanqi Tang Shihuan Shao Feng Xu Yangyang Fu Shengyong Xu Chen Li Yan Li Yang Liu Joseph Harold Walline Huadong Zhu yuguo Chen Xuezhong Yu Jun Xu Emergency Department State Key Laboratory of Complex Severe and Rare DiseasesPeking Union Medical College HospitalChinese Academy of Medical Science and Peking Union Medical CollegeBeijing 100730China Emergency Department Peking University People’s HospitalBeijing 100044China Department of Emergency and Chest Pain Center Shandong Provincial Clinical Research Center for Emergency and Critical Care MedicineKey Laboratory of Emergency and Critical Care Medicine of Shandong ProvinceQilu Hospital of Shandong UniversityJinan 250012China Emergency Department Beijing Jishuitan HospitalBeijing 100035China Emergency Department Tianjin Medical University General HospitalTianjin 300052China Department of Emergency Medicine Penn State Health Milton S.Hershey Medical Center and Penn State College of MedicineHershey 17033USA

BACKGROUND:Unsustained return of spontaneous circulation(ROSC)is a critical barrier to survival in cardiac arrest *** study examined whether end-tidal carbon dioxide(ETCO_(2))and pulse oximetry photoplethysmogram(POP)parameters can be used to identify unsustained ***:We conducted a multicenter observational prospective cohort study of consecutive patients with cardiac arrest from 2013.to ***’general information,ETCO_(2),and POP parameters were collected and statistically ***:The included 105 ROSC episodes(from 80 cardiac arrest patients)comprised 51 sustained ROSC episodes and 54 unsustained ROSC *** 24-hour survival rate was significantly higher in the sustained ROSC group than in the unsustained ROSC group(29.2%vs.9.4%,P3.,95%confi dence interval[95%CI]0.881-0.984,P=0.011 and OR=0.998,95%CI 0.997-0.999,P3.95%CI 0.818-0.948),and 0.902(95%CI 0.842-0.962),***:Patients with unsustained ROSC have a poor *** combination ofΔETCO_(2) andΔAUCp showed signifi cant predictive value for unsustained ROSC.

关键词： Return of spontaneous circulation Pulse oximetry photoplethysmogram End-tidal carbon dioxide Cardiac arrest Cardiopulmonary resuscitation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

为学会而教:以学历案为内核的学习支持系统的建构与应用

引用

全球教育展望 2024年第2期53卷 120-134页

作者：李玉国郑州市回民高级中学郑州450000

本研究以提升教学效果为目标,针对“教与学脱节”“教与评分离”“知识不能转化为素养”等问题,进行了8年的持续探索,形成了以学历案教学为抓手,覆盖教学设计、教学实施、教学评价的全流程解决方案,建构了帮助学生“学会”、促进学生“... 详细信息

本研究以提升教学效果为目标,针对“教与学脱节”“教与评分离”“知识不能转化为素养”等问题,进行了8年的持续探索,形成了以学历案教学为抓手,覆盖教学设计、教学实施、教学评价的全流程解决方案,建构了帮助学生“学会”、促进学生“会学”的学习支持系统。问题源于教学,研究过程植根于教学,研究成果应用于教学,促进了教学常规各环节的专业化和规范化建设,全面提升了教师学科专业理解和学科育人能力;全学科、持续性的行动研究和学习支持系统的不断优化迭代,为学生的学习力及学业成就提升提供了有力支持,同时也丰富了核心素养导向的新教学实践样态。

关键词：教学效果学习支持系统学历案

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

栽培薯蓣茎段离体再生体系的建立

引用

植物学报 2024年第5期59卷 792-799页

作者：冯雯王玉国复旦大学生命科学学院上海200438

为建立栽培薯蓣(Dioscorea polystachya)组培再生体系,以茎尖及茎尖下4个不同长度的茎段为外植体,探讨了不同浓度植物生长调节剂、培养基类型及茎段对腋芽诱导和植株再生的影响。结果表明,培养基配比为MS+1.0 mg·L^(–1)6-BA+0.5 mg·... 详细信息

为建立栽培薯蓣(Dioscorea polystachya)组培再生体系,以茎尖及茎尖下4个不同长度的茎段为外植体,探讨了不同浓度植物生长调节剂、培养基类型及茎段对腋芽诱导和植株再生的影响。结果表明,培养基配比为MS+1.0 mg·L^(–1)6-BA+0.5 mg·L^(–1)KT和茎尖下12–20 cm的茎段为栽培薯蓣不定芽诱导的最佳组合,诱导率达90.0%;继代培养最适培养基配方为MS+0.5 mg·L^(–1)6-BA+0.05 mg·L^(–1)NAA+0.1 mg·L^(–1)KT,低浓度NAA固定时,增殖系数在一定范围内随着6-BA浓度的升高而增高;在相同外源激素条件下,快繁生根采用DKW培养基明显优于常规1/2MS培养基,生根率显著提高,达92.86%。添加1 mg PVP以及增加转接次数均能明显降低褐化率。该研究有效解决了栽培薯蓣种质资源离体稳定繁殖取材部位优化的问题,为规模化生产栽培薯蓣优质脱毒苗奠定了良好基础。

关键词：栽培薯蓣茎段组织培养离体再生

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

融合发展背景下纸、数教材协同编纂实现进路和机制要点

引用

出版发行研究 2024年第4期 50-57页

作者：罗巧玲朱于国人教数字出版有限公司人民教育出版社

教育出版的未来之路是融合发展之路,从近年发展形势看,纸质教材、数字教材联动研发尚处在探索阶段,暂未形成清晰的发展思路和有序的开发模式。文章以教材出版供给侧结构性改革为出发点,以“协同编纂”这一关键环节为入口,探究融合发展... 详细信息

教育出版的未来之路是融合发展之路,从近年发展形势看,纸质教材、数字教材联动研发尚处在探索阶段,暂未形成清晰的发展思路和有序的开发模式。文章以教材出版供给侧结构性改革为出发点,以“协同编纂”这一关键环节为入口,探究融合发展背景下纸、数教材协同编纂的实现进路和机制要点,为教材出版融合发展作有益探索。

关键词：教材编研协同编纂融合发展纸数联动

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

语文课程中的审美教育:历史脉络、目标定位与实践策略

引用

课程．教材．教法 2024年第6期44卷 93-100页

作者：李晶晶朱于国山东大学文学院济南250100 人民教育出版社北京100081

纵观语文课程的历史发展进程,审美教育是从传统语文教育的重要内容逐渐成为语文课程的核心要素的。语文课程中的审美教育以语言文字审美为核心,其对象分别为方块汉字、汉语声韵与言语作品。它有着独特的目标定位,从低到高可分为四个层次... 详细信息

纵观语文课程的历史发展进程,审美教育是从传统语文教育的重要内容逐渐成为语文课程的核心要素的。语文课程中的审美教育以语言文字审美为核心,其对象分别为方块汉字、汉语声韵与言语作品。它有着独特的目标定位,从低到高可分为四个层次:以感受美、体验美为基础目标,以欣赏美、评价美为发展目标,以发现美、表现美为进阶目标,以培养高尚的审美情趣为高阶目标。在新时代背景下,语文课程以高素质教师引领为关键,面向审美教育的中心——学生,以美育人润心,以文化人启智,循序渐进地开展丰富多样的审美实践活动,激发审美愉悦,注重个性创造,从而实现中华美育精神的弘扬与审美心灵的浸润。

关键词：语文课程审美教育语言文字审美审美体验

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：