检索结果-南通市图书馆

Journal of Environmental Sciences 2021年第2期33卷 306-316页

作者： Jie Wan Jiawei Chen Ru Zhao Renxian Zhou Energy Research Institute Nanjing Institute of TechnologyNanjing 211167China Institute of Catalysis Zhejiang UniversityHangzhou 310028China

Series of Fe/Cu-SSZ-13 catalysts with different Fe loading content were synthesized by simple one-pot strategy.The obtained catalysts were subjected to selective catalytic reduction(SCR)of NO x with NH 3 and were characterized by various techniques.The results show that Fe 0.63/Cu 1.50-SSZ-13 catalyst with proper Fe content exhibits excellent catalytic activity with widest operation temperature window from 160 to 580℃,excellent hydrothermal stability as well as good resistance to sulfur poisoning when compared with Cu-SSZ-13,signifying its great potential for practical applications.Further characterizations reveal that the synthesized Fe/Cu-SSZ-13 catalysts present typical chabazite(CHA)structure with good crystallinity,while isolated Cu^2+and monomeric Fe 3+are revealed as the predominant copper and iron species.At low temperatures,isolated Cu^2+species act as primary active sites for SCR reaction,while monomeric Fe^3+species provide sufficient active sites for sustain the SCR activity at high temperature.Moreover,Fe over doping would lead to the damage of zeolite structure,destruction of isolated Cu^2+site,as well as the formation of highly oxidizing Fe2O3,thus causing deterioration of catalytic performances.

关键词： NH3-SCR Fe/Cu-SSZ-13 One-pot synthesis Active species

维普期刊数据库

Chloride-Promoted Photoelectrochemical C-H Silylation of Heteroarenes

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2023年第22期41卷 2963-2968页

作者： Xin-Ru Zhao Yu-Chen Zhang Zhong-Wei Hou Lei Wang Advanced Research Institute and School of Pharmaceutical Sciences Taizhou UniversityJiaojiangZhejiang 318000China Department of Chemistry Huaibei Normal UniversityHuaibeiAnhui 235000China State Key Laboratory of Organometalic Chemistry Shanghai lnstitute of Organic ChemistryChinese Academy of SciencsShanghai200032China

A photoelectrochemical approach for the C-H silylation of heteroarenes through dehydrogenation cross-coupling with H2 evolution has been developed.The photoelectrochemical C-H silylation depends on hydrogen atom transfer(HAT)from silanes to Cl-radical generated through the light-induced homolytic cleavage of Cl2,in which Cl2 was produced by electrochemical oxidation of chloride.A large number of silylated heterocyclic molecules are rapidly constructed in satisfactory yields without relying on oxidants and metal reagents.

关键词： Photoelectrochemistry Silyl radicals C-H silylation Dehydrogenation N-Heterocycles Cross-coupling Oxidation

A Comprehensive Overview of CFN From a Commonsense Perspective

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Machine Intelligence Research 2024年第2期21卷 239-256页

作者： ru Li Yunxiao zhao Zhiqiang Wang Xuefeng Su Shaoru Guo Yong Guan Xiaoqi Han Hongyan zhao Key Laboratory of Computational Intelligence and Chinese Information Processing of Ministry of Education School of Computer and Information TechnologyShanxi UniversityTaiyuan 030006China

Chinese FrameNet(CFN)is a scenario commonsense knowledge base(CKB)that plays an important role in research on Chinese language understanding.It is based on the theory of frame semantics and English FrameNet(FN).The CFN knowledge base contains a wealth of scenario commonsense knowledge,including frames,frame elements,and frame relations,as well as annotated instances with rich scenario-related labels on Chinese sentences and discourses.In this paper,we conduct a comprehensive overview of CFN from a commonsense perspective,covering topics such as scenario commonsense representation,CFN resources,and its applications.We also summarize recent breakthroughs and identify future research directions.First,we introduce the concept of scenario commonsense,including its definitions,examples,and representation methods,with a focus on the relationship between scenario commonsense and the frame concept in CFN.In addition,we provide a comprehensive overview of CFN resources and their applications,highlighting the newly proposed frame-based discourse representation and a human-machine collaboration framework for expanding the CFN corpus.Furthermore,we explore emerging topics such as expanding the CFN resource,improving the interpretability of machine reading comprehension,and using scenario CKBs for text generation.

关键词： Chinese FrameNet(CFN) commonsense scenario commonsense frame knowledge

Incidence of surgical site infection in minimally invasive colorectal surgery

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Surgery 2024年第4期16卷 1121-1129页

作者： Lu-Ting Ni Ru Zhao Yi-ru Ye Yi-Ming Ouyang Xin Chen Department of Surgery The First Affiliated Hospital of Soochow UniversitySuzhou 215000Jiangsu ProvinceChina

BACKGROUND Surgical site infection(SSI)is a common complication of colorectal surgery.Minimally invasive surgery notably reduces the incidence of SSI.This study aimed to compare the incidences of SSI after robot-assisted colorectal surgery(RACS)vs that after laparoscopic assisted colorectal surgery(LACS)and to analyze associated risk factors for SSI in minimally invasive colorectal surgery.AIM To compare the incidences of SSI after RACS and LACS,and to analyze the risk factors associated with SSI after minimally invasive colorectal surgery.METHODS Clinical data derived from patients who underwent minimally invasive colorectal surgery between October 2020 and October 2022 at the First Affiliated Hospital of Soochow University were collated.Differences in clinical characteristics and surgeryrelated information associated with RACS and LACS were compared,and possible risk factors for SSI were identified.RESULTS A total of 246 patients(112 LACS and 134 RACS)were included in the study.Fortythree(17.5%)developed SSI.The proportions of patients who developed SSI were similar in the two groups(17.9%vs 17.2%,P=0.887).Diabetes mellitus,intraoperative blood loss≥100 mL,and incision length were independent risk factors for SSI.Possible additional risk factors included neoadjuvant therapy,lesion site,and operation time.CONCLUSION There was no difference in SSI incidence in the RACS and LACS groups.Diabetes mellitus,intraoperative blood loss≥100 mL,and incision length were independent risk factors for postoperative SSI.

关键词： Colorectal surgery Minimally invasive surgery Surgical site infection

A novel tunnel FET design through hybrid modulation with optimized subthreshold characteristics and high drive capability

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2020年第2期63卷 245-247页

作者： Yang zhao Qianqian HUANG ru HUANG Key Laboratory of Microelectronic Devices and Circuits (MOE) Institute of Microelectronics Peking University National Key Laboratory of Science and Technology on Micro/Nano Fabrication Peking University

Dear editor,As CMOS technology scaling down, the reduction of supply voltage and power consumption becomes extremely difficult due to the subthreshold swing(SS) limitation (60 m V/dec) at room temperature.Tunnel FET (TFET) with band-to-band tunneling (BTBT) mechanism is regarded as one of the most promising emerging low-power devices due to its sub-60 m V/dec SS and ultra-low off-current

关键词： A novel tunnel FET design through hybrid modulation with optimized subthreshold characteristics and high drive capability FET

两种不同森林类型叶凋落物分解特征及影响因子研究

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Plant Ecology 2022年第6期15卷 1285-1301页

作者： Yuan-Yuan zhao Zhuo-Ting Li Ting Xu An-ru Lou State Key Laboratory of Earth Surface Processes and Resource Ecology College of Life Sciences of Beijing Normal UniversityBeijing 100875China

叶凋落物分解为森林生态系统提供了重要的能量和养分来源。除传统的环境因素外,叶凋落物的降解过程也受到绿叶功能性状和叶凋落物基质质量的影响。然而,在群落水平上,绿叶功能性状和叶凋落物基质质量对不同森林群落叶凋落物分解的相对... 详细信息

叶凋落物分解为森林生态系统提供了重要的能量和养分来源。除传统的环境因素外,叶凋落物的降解过程也受到绿叶功能性状和叶凋落物基质质量的影响。然而,在群落水平上,绿叶功能性状和叶凋落物基质质量对不同森林群落叶凋落物分解的相对重要性仍不清楚。因此,本研究以北京东灵山地区7种典型森林群落类型的混合叶凋落物为研究对象,利用分解袋法通过360天的野外相似环境分解实验对叶凋落物的分解过程进行了研究。这些森林群落包括6种分别以胡桃楸(Juglans mandshurica)、青杨(Populus cathayana)、棘皮桦(Betula dahurica)、白桦(Betula platyphylla)、油松(Pinus tabuliformis)和华北落叶松(Larix gmelinii var.principis-rupprechtii)为优势种的单优种群落,以及一种以大叶白蜡(Fraxinus rhynchophylla)、蒙古栎(Quercus mongolica)和蒙椴(Tilia mongolica)为优势种的共优种群落。研究结果表明,不同森林群落之间叶凋落物分解速率存在显著差异。群落聚合的植物功能性状和叶凋落物基质质量分别解释了群落叶凋落物分解速率变异的35.60%和9.05%,两者交互作用解释率为23.37%,表明群落聚合的植物功能性状及其与叶凋落物基质质量的共同作用是影响群落叶凋落物分解速率变异的主要因素。通过冗余分析发现,叶片氮含量、叶干物质含量、叶片单宁含量和比叶面积能显著影响群落叶凋落物分解速率的变异。因此,在对群落水平上叶凋落物分解的研究应该关注群落聚合的绿叶功能性状对分解的影响。

关键词：北京东灵山暖温带森林生态系统叶凋落物分解影响因素群落加权均值绿叶功能性状叶凋落物基质质量

Advance in glycosyltransferases, the important bioparts for production of diversified ginsenosides

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Natural Medicines 2020年第9期18卷 643-658页

作者： zhao Jia-Ning WANG ru-Feng zhao Shu-Juan WANG Zheng-Tao The SATCM Key Laboratoty for New Resources&Quality Evaluation of Chinese Medicine The MOE Key Laboratoty for Standardization of Chinese Medicines and Shanghai Key Laboratory of Compound Chinese MedicinesInstitute of Chinese Materia MedicaShanghai University of Traditional Chinese MedicineShanghai 201203China

Ginsenosides are a series of glycosylated triterpenoids predominantly originated from Panax species with multiple pharmacological activities such as anti-aging, mediatory effect on the immune system and the nervous system. During the biosynthesis of ginsenosides, glycosyltransferases play essential roles by transferring various sugar moieties to the sapogenins in contributing to form structure and bioactivity diversified ginsenosides, which makes them important bioparts for synthetic biology-based production of these valuable ginsenosides. In this review, we summarized the functional elucidated glycosyltransferases responsible for ginsenoside biosynthesis, the advance in the protein engineering of UDP-glycosyltransferases(UGTs) and their application with the aim to provide in-depth understanding on ginsenoside-related UGTs for the production of rare ginsenosides applying synthetic biology-based microbial cell factories in the future.

关键词： Glycosyltransferase Ginsenosides Biosynthesis Protein engineering Catalytic efficiency

维普期刊数据库

Route Analysis of the Change of the Charitable Donation System of the Enterprises in China

在线全文

学校读者我要写书评

暂无评论

学术界 2014年第12期 303-307页

作者： zhao ru School of Political Studies Chengdu University of Technology

After the new China was founded,the charitable donation of enterprises experienced prejudice and developed gradually into the largest source of donation. From the perspective of the new institutional economics,such a change results from the widening gap between the rich and the poor,the upgrading of the demand structure and the change of the institutional environment during the transformation period,which leads to the change of price,preference and institution. The initial route change has already got positive effects,which arouses the enthusiasm of the charitable donation of enterprises and changes them into the supplement of the social security system of governments. After the reform and opening-up policy,the route change was once solidified because the development of charitable donation of enterprises and the transformation of the government functions lagged behind,influencing the operating of "the function of the third distribution" of the donation of enterprises. So we must actively take advantage of the external pressure and realize the perfection and development of the route change through the intervention of the government.

关键词： the charitable donation system of enterprises route dependence positive effect negative effect

A Pipeline Approach to Free-Description Question Answering in Chinese Gaokao Reading Comprehension

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2019年第1期28卷 113-119页

作者： TAN Hongye zhao Honghong LI ru LIU Bei School of Computer and Information Technology of Shanxi University Key Laboratory of Ministry of Education for Computation Intelligence and Chinese Information Processing of Shanxi University

This study attempted to answer complicated free-description questions in Chinese Gaokao Reading comprehension(RC) tasks. We found that quite a few questions can be answered by extracting sentences from the document and combining them, so we used a pipeline approach with two components:Answer sentence extraction(ASE) and Answer sentence fusion(ASF). Semantic vector similarity and topical distribution similarity were explored for ASE. Integer linear programming strategy was used for ASF, which combined dependencies with the language model, based on word importance. As a first step towards the new challenge, we obtained some encouraging results on actual exam questions in Chinese subject’s RC tasks of Beijing Gaokao, which helped us obtain insights into techniques needed to solve real-word complex questions.

关键词： Reading comprehension(RC) Free-description question Answer sentence extraction(ASE) Answer sentence fusion

Role of carbon in modifying solidification and microstructure of a Ni?based superalloy with high Al and Ti contents

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research(International) 2021年第1期28卷 98-110页

作者： Guang‑di zhao Xi‑min Zang Wen‑ru Sun School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051LiaoningChina Institute of Metal Research Chinese Academy of SciencesShenyang 110016LiaoningChina

The effect of carbon ranging from 0.014 to 0.071 wt.%on the solidification and microstructure of a Ni-based superalloy with high Al and Ti contents was studied.The results show that the increase in carbon addition significantly increases the size and volume fraction of MC carbides and promotes the change of their morphology from blocky to elongated shape.However,the carbon addition obviously decreases the size and volume fraction of eutectic(γ+γ′)and reducesηphase and borides formation.The change in carbide characteristics is mainly because of the increasing carbide-forming element and carbides precipitation temperature with the increase in carbon which favors the growth of them along the interdendritic liquid film.MC carbides are formed at an earlier solidification stage than the eutectic(γ+γ′).The increased carbide formation consumes more Ti,which delays and reduces the eutectic(γ+γ′)precipitation.The delay of eutectic(γ+γ′)precipitation leads to a deeper undercooling,which significantly decreases the critical Ti concentration for its precipitation.This,in turn,lowers Ti/Al ratio in residual liquids ahead of the eutectic(γ+γ′)and hence reducesηformation subsequently.B and Zr are slightly enriched in the carbides,which are considered during discussing how carbon influences the eutectic(γ+γ′)precipitation.

关键词： Carbon Ni-based superalloy Solidification Segregation Eutectic(γ+γ′) MC carbide