检索结果-南通市图书馆

Engineering Spin States of Isolated Copper Species in a Metal-Organic Framework Improves Urea Electrosynthesis

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

Nano-Micro Letters 2023年第9期15卷 536-549页

作者： Yuhang Gao jingnan wang Yijun Yang Jian wang Chuang Zhang Xi wang Jiannian Yao Key Laboratory of Photochemistry Beijing National Laboratory for Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190People’s Republic of China University of Chinese Academy of Sciences Beijing 100049People’s Republic of China Molecular Plus and Collaborative Innovation Center of Chemical Science and Engineering Tianjin UniversityTianjin 300072People’s Republic of China Department of Physics School of Physical Science and EngineeringBeijing Jiaotong UniversityBeijing 100044People’s Republic of China Research Center for Magnetic and Spintronic Materials National Institute for Materials Science Tsukuba 305-0047Japan

The catalytic activities are generally believed to be relevant to the electronic states of their active center, but understanding this relationship is usually difficult. Here, we design two types of catalysts for electrocatalytic urea via a coordination strategy in a metal–organic frameworks: Cu^(Ⅲ)-HHTP and Cu^(Ⅱ)-HHTP. Cu^(Ⅲ)-HHTP exhibits an improved urea production rate of 7.78 mmol h^(−1)g^(−1) and an enhanced Faradaic efficiency of 23.09% at-0.6 V vs. reversible hydrogen electrode, in sharp contrast to Cu^(Ⅱ)-*** CuⅢspecies with S = 0 spin ground state are demonstrated as the active center in Cu^(Ⅲ)-HHTP, different from Cu^(Ⅱ) with S = 1/2 in Cu^(Ⅱ)-HHTP. We further demonstrate that isolated Cu^(Ⅲ)with an empty dx2-y20orbital in Cu^(Ⅲ)-HHTP experiences a single-electron migration path with a lower energy barrier in the C–N coupling process, while Cu^(Ⅱ)with a single-spin state( d_(x2-y2)^(1)) in Cu^(Ⅱ)-HHTP undergoes a two-electron migration pathway.

关键词： Electrocatalysis Urea synthesis Metal-organic framework Spin catalysis C-N coupling

Immunohistochemical prognostic markers of esophageal squamous cell carcinoma:a systematic review

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Cancer 2017年第11期36卷 592-608页

作者： Chunni wang jingnan wang Zhaoli Chen Yibo Gao Jie He Department of Thoracic Surgery National Cancer Center/Cancer HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeScience Building Center for Cancer Precision Medicine Chinese Academy of Medical Sciences and Peking Union Medical College

Background: Esophageal squamous cell carcinoma(ESCC) is an aggressive malignancy, with a high incidence and poor prognosis. In the past several decades, hundreds of proteins have been reported to be associated with the prognosis of ESCC, but none has been widely accepted to guide clinical care. This study aimed to identify proteins with great potential for predicting prognosis of ***: We conducted a systematic review on immunohistochemical(IHC) prognostic markers of ESCC according to the 2009 Preferred Reporting Items for Systematic Reviews and Meta-Analyses(PRISMA) Guidelines. Literature related to IHC prognostic markers of ESCC were searched from PubMed, Embase, Web of Science, and Cochrane Library until January 30 th, 2017. The risk of bias of these original studies was evaluated using the Quality in Prognosis Studies(QUIPS) ***: We identified 11 emerging IHC markers with reproducible results, including eight markers [epidermal growth factor receptor(EGFR), Cyclin D1, vascular endothelial growth factor(VEGF), Survivin, Podoplanin, Fascin,phosphorylated mammalian target of rapamycin(p-mTOR), and pyruvate kinase M2(PKM2)] indicating unfavorable prognosis and 3 markers(P27, P16, and E-cadherin) indicating favorable prognosis of ***: Strong evidence supports that these 11 emerging IHC markers or their combinations may be useful in predicting prognosis and aiding personalized therapy decision-making for ESCC patients.

关键词： Esophageal squamous cell carcinoma Prognosis Survival Immunohistochemical markers

Changes in blood-brain barrier permeability and expression of related factors in a rat model of intracerebral hemorrhage following minocycline treatment

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2010年第17期5卷 1308-1312页

作者： Wei Shi Zizhang wang jingnan Pu Ruizhi wang Zhenyu Guo Chongxiao Liu Jianjun Sun Ligui Gao Ren Zhou Department of Neurosurgery Second Affiliated Hospital of Xi'an Jiaotong UniversityXi'an 710004Shaanxi ProvinceChina

Inflammatory factor aggregation and blood-brain barrier（BBB）damage occur around hematoma foci following intracerebral *** is lipophilic,can pass through the BBB,and shows anti-inflammatory effects in models of central nervous system *** found that minocycline application at 6 hours after intracerebral hemorrhage reduced BBB permeability,decreased vascular endothelial growth factor expression,and increased nerve growth factor and heat shock protein 70 expression,primarily in neurons and *** intraperitoneal injection of minocycline attenuated BBB damage possibly by reducing vascular endothelial growth factor expression and enhancing nerve growth factor and heat shock protein 70 expression.

关键词： blood-brain barrier intracerebral hemorrhage vascular endothelial growth factor nerve growth factor heat shock protein 70 therapy

Active sites of Pt/CNTs nanocatalysts for aerobic base-free oxidation of glycerol

在线全文

学校读者我要写书评

暂无评论

Green Energy & Environment 2020年第1期5卷 76-82页

作者： Minjian Pan jingnan wang Wenzhao Fu Bingxu Chen Jiaqi Lei Wenyao Chen Xuezhi Duan De Chen Gang Qian Xinggui Zhou State Key Laboratory of Chemical Engineering East China University of Science and Technology130 Meilong RoadShanghai200237China Department of Chemical Engineering Norwegian University of Science and TechnologyTrondheim7491Norway

Understanding the nature of Pt active sites is of great importance for the structure-sensitive base-free oxidation of glycerol. In the present work, the remarkable Pt particle size effects on glycerol conversion and products formation from the oxidation of the primary and the secondary hydroxyl groups are understood by combining the model calculations and DFT calculations, aiming to discriminate the corresponding dominant Pt active sites. The Pt(100) facet is demonstrated to be the dominant active sites for the glycerol conversion and the products formation from the two routes. The insights revealed here could shed new light on fundamental understanding of the Pt particle size effects and then guiding the design and optimization of Pt-catalyzed base-free oxidation of glycerol toward targeted products.

关键词： Base-free oxidation of glycerol Pt/CNTs catalyst Active sites Model calculations DFT calculations

Co-enhancement of thermal conduction and radiation through morphologies controlling of graphene functional layer for chip thermal management

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第10期17卷 8885-8892页

作者： Shuting Cheng Kun wang Shichen Xu Yi Cheng Ruojuan Liu Kewen Huang Hao Yuan Wenjuan Li Yuyao Yang Fushun Liang Fan Yang Kangyi Zheng Zhiwei Liang Ce Tu Mengxiong Liu Xiaomin Yang jingnan wang Xuzhao Gai Yuejie Zhao Xiaobai wang Yue Qi Zhongfan Liu State Key Laboratory of Heavy Oil Processing College of ScienceChina University of PetroleumBeijing 102249China Centre for Nanochemistry Beijing Science and Engineering Centre for NanocarbonsBeijing National Laboratory for Molecular SciencesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Beijing Graphene Institute(BGI) Beijing 100095China College of Energy Soochow Institute for Energy and Materials Innovations(SIEMIS)Jiangsu Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy TechnologiesSoochow UniversitySuzhou 215006China Department of Chemistry College of Chemistry and Materials EngineeringBeijing Technology and Business UniversityBeijing 100048China

With the continuous advancements in electronics towards downsizing and integration,efficient thermal dissipation from chips has emerged as a critical factor affecting their lifespan and operational *** fan-less chip cooling system has two critical interfaces for thermal transport,which are the contact interface between the base and the chip dominated by thermal conduction,and the surface of the fins dominated by thermal *** different thermal transfer modes of these two critical interfaces pose different requirements for thermal management *** the study,a novel approach was proposed by developing graphene thermal transport functional material whose morphology could be intentionally designed via reformed plasmaenhanced chemical vapor deposition(PECVD)methods to meet the diverse requirements of heat transfer ***,graphene with multilevel branching structure of vertical graphene(BVG)was fabricated through the hydrogenassisted PECVD(H_(2)-PECVD)strategy,which contributed a high emissivity of~*** was deposited on the fins’surface and functioned as the radiation enhanced layer to facilitate the rapid radiation of heat from the heat sinks into the surrounding ***,the well-oriented vertical graphene(OVG)was successfully prepared through the vertical electric field-assisted PECVD process(EF-PECVD),which showed a high directional thermal conductivity of~53.5 W·m^(-1)·K^(-1).OVG was deposited on the contact interface and functioned as the thermal conduction enhanced layer,allowing for the quick transmission of heat from the chip to the heat *** this design concept,the two critical interfaces in the chip cooling system can be jointly enhanced,resulting in a remarkable cooling efficiency enhancement of~30.7%,demonstrating that this novel material possessed enormous potential for enhancing the performance of cooling ***,this research not only provided new design concepts for the cooling system

关键词： chip thermal management thermal conduction thermal radiation graphene morphology control

超连续谱光源辐照可见光CMOS图像传感器的实验研究

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

红外与激光工程 2017年第1期46卷 120-125页

作者：王景楠聂劲松电子工程学院脉冲功率激光技术国家重点实验室安徽合肥230037

研究了超连续谱光源对可见光CMOS图像传感器辐照的实验现象和规律。观察到随着入射激光功率的不断增大,CMOS图像传感器依次出现了像元饱和、局部饱和、局部过饱和以及全屏饱和等现象。与1 060 nm锁模光纤激光辐照同种图像传感器的实验... 详细信息

研究了超连续谱光源对可见光CMOS图像传感器辐照的实验现象和规律。观察到随着入射激光功率的不断增大,CMOS图像传感器依次出现了像元饱和、局部饱和、局部过饱和以及全屏饱和等现象。与1 060 nm锁模光纤激光辐照同种图像传感器的实验相对比,从有效干扰面积、图像相关度及图像均方差等三个方面,对比了两种干扰源在影响CMOS图像传感器成像质量方面的异同,发现CMOS图像传感器的响应特性、激光的频谱特性和成像光学系统的色散是导致干扰效果差异的主要原因。

关键词：超连续谱锁模激光 CMOS 激光干扰对比

在线全文

学校读者我要写书评

暂无评论

双层皮幕墙内置遮阳百叶倾角评价方法

湖南大学学报（自然科学版） 2017年第9期44卷 174-181页

作者：陈友明王京南王衍金湖南大学土木工程学院湖南长沙410082

为了更加科学合理地动态调整双层皮幕墙(DSF)内置遮阳百叶的角度,满足自然采光和节能的双重需求,建立了受遮阳百叶倾角影响的室内综合得热量与平均采光系数的数学模型,通过对模拟结果的标准化处理和线性加权求和方法,建立了DSF内置遮阳... 详细信息

为了更加科学合理地动态调整双层皮幕墙(DSF)内置遮阳百叶的角度,满足自然采光和节能的双重需求,建立了受遮阳百叶倾角影响的室内综合得热量与平均采光系数的数学模型,通过对模拟结果的标准化处理和线性加权求和方法,建立了DSF内置遮阳百叶倾角评价模型.以长沙地区某建筑南向DSF为例,详细介绍了自然通风工况下,8:00至18:00时间段内,晴天及阴天典型日该双层皮幕墙百叶倾角评价模型的构建过程.通过模拟分析发现,长沙夏季晴天DSF遮阳百叶最佳倾角为82°,最佳倾角范围为73°~90°;长沙夏季阴天DSF系统遮阳百叶最佳倾角为0°,最佳倾角范围为0°~36°.

关键词：双层皮幕墙遮阳百叶评价方法最佳倾角动态控制

在线全文

学校读者我要写书评

暂无评论

制度环境、所有制差异与内资独资化绩效评估

当代经济科学 2021年第4期43卷 12-26页

作者：包群王靖楠梁贺南开大学经济学院天津300071

建立合资企业是本土企业向外商学习先进技术及管理经验的重要路径,但外资流出后企业绩效的变化却较少受到研究关注。本文以4051家由合资经营转向内资独资经营的企业为样本,考察了合资企业内资独资化后的绩效变化,并重点比较了合资企业... 详细信息

建立合资企业是本土企业向外商学习先进技术及管理经验的重要路径,但外资流出后企业绩效的变化却较少受到研究关注。本文以4051家由合资经营转向内资独资经营的企业为样本,考察了合资企业内资独资化后的绩效变化,并重点比较了合资企业国有化与民营化的绩效变化差异。研究发现:总体上合资企业内资独资化后企业绩效显著提升;区分企业所有制后发现,民营合资企业民营化后企业绩效明显提升,然而国有合资企业国有化后企业绩效没有呈现明显改变;进一步从企业内部来看,合资企业民营化后企业管理成本下降并且企业研发创新提升,这一特征在合资企业国有化上并不存在;另外从企业外部来看,地方政府的干预会明显抑制合资企业国有化后的绩效提升。研究启示为,FDI的溢出效应在外资流出后仍然具有持续性,并且合资企业内资独资化的绩效改善不仅依赖于企业自身,同时依赖于地区制度环境的质量。

关键词：合资企业内资独资化经营国有化民营化企业绩效区域制度环境

在线全文

学校读者我要写书评

暂无评论

牙根发育异常疾病概述

国际口腔医学杂志 2023年第6期50卷 639-645页

作者：王京楠邓淑丽浙江大学医学院附属口腔医院牙体牙髓科、浙江大学口腔医学院、浙江省口腔疾病临床医学研究中心、浙江省口腔生物医学研究重点实验室、浙江大学癌症研究院杭州310000

牙根发育异常严重影响牙齿正常行使功能,甚至导致牙齿的早期脱落。牙根发育异常的表现复杂多样,目前对该类疾病仍认识不足,具体的致病机制尚不清楚。本文在总结大量病例报告及研究进展的基础上,就主要的牙根发育异常疾病的临床表现和可... 详细信息

牙根发育异常严重影响牙齿正常行使功能,甚至导致牙齿的早期脱落。牙根发育异常的表现复杂多样,目前对该类疾病仍认识不足,具体的致病机制尚不清楚。本文在总结大量病例报告及研究进展的基础上,就主要的牙根发育异常疾病的临床表现和可能的致病机制进行综述。

关键词：牙根牙根发育牙根发育异常