检索结果-南通市图书馆

Effect of different operation conditions on PCDD/F inhibition by ammonium dihydrogen phosphate:concentrations,distributions and mechanisms

在线全文

学校读者我要写书评

暂无评论

Waste Disposal and Sustainable Energy 2024年第1期6卷 11-23页

作者： Jiayao Wu Weican Xiang Xiaoxiao Wang Wenlong Song Yuxuan ying Xiaoqing Lin Xiaodong Li State Key Laboratory of Clean Energy Utilization National Engineering Laboratory of Waste Incineration Technology and EquipmentInstitute of Thermal Power Engineering of Zhejiang UniversityHangzhou310027ZhejiangChina

Phosphorus-containing compounds are considered as the potential alternatives of traditional inhibitors for suppressing the formation of polychlorinated dibenzo-p-dioxins and dibenzofurans(PCDD/Fs),but the suppression characteristics are scarcely *** this study,ammonium dihydrogen phosphate(ADP)was selected as the inhibitor to inhibit the PCDD/F formation via de novo synthesis at 350℃.The influence of oxygen content and addition method on PCDD/F inhibition was systematically investigated by means of statistical analysis and morphological *** results showed that oxygen enhanced the formation of PCDD/Fs from 1470 ng g^(−1)(9.78 ng I-TEQ g^(−1))to 2110 ng g^(−1)(14.8 ng I-TEQ g^(−1)).ADP significantly inhibited the PCDD/F formation,with inhibition efficiencies ranging from 82.0%to 97.7%.Herein,a higher oxygen content and the premixed way intensified the suppression ***-p-dioxin(DD)/dibenzofuran(DF)chlorination was proven to be effectively suppressed while chlorophenol(CP)route was not obviously *** the addition of ADP,Cl source was significantly reduced and the formation of organic Cl was effectively ***,it decreased the proportion of C–O/C=N and C=O,revealing the efficient inhibition of carbon ***,the formation of copper phosphate and copper pyrophosphate was observed in XPS(X-ray photoelectron spectroscopy)spectra,indicating that the catalytic metal Cu was chelated and passivated by *** premixed way had a better effect on reducing Cl resources,inhibiting oxidation and chelating metals,due to the direct contact with ***,the separation method could only depend on the decomposed gases,resulting in a lower inhibition efficiency.

关键词： Ammonium dihydrogen phosphate Polychlorinated dibenzo-p-dioxins and dibenzofuran inhibition Oxygen content Adding way Mechanisms

Transfer force perception skills to robot‐assisted laminectomy via imitation learning from human demonstrations

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

CAAI Transactions on Intelligence Technology 2024年第4期9卷 903-916页

作者： Meng Li Xiaozhi Qi Xiaoguang Han ying Hu Bing Li Yu Zhao Jianwei Zhang Harbin Institute of Technology ShenzhenChina Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhenChina Shenzhen Key Laboratory of Minimally Invasive Surgical Robotics and System Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhenChina Beijing Jishuitan Hospital Capital Medical UniversityBeijingChina Department of Orthopedics Peking Union Medical College HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijingChina University of Hamburg Hamburg22527Germany

A comparative study of two force perception skill learning approaches for robot‐assisted spinal surgery,the impedance model method and the imitation learning(IL)method,is *** impedance model method develops separate models for the surgeon and patient,incorporating spring‐damper and bone‐grinding *** surgeons'feature parameters are collected and mapped using support vector regression and image navi-gation *** imitation learning approach utilises long short‐term memory networks(LSTM)and addresses accurate data labelling challenges with custom *** results demonstrate skill recognition rates of 63.61%-74.62%for the impedance model approach,relying on manual feature ***,the imitation learning approach achieves a force perception recognition rate of 91.06%,outperforming the impedance model on curved bone *** findings demonstrate the potential of imitation learning to enhance skill acquisition in robot‐assisted spinal surgery by eliminating the laborious process of manual feature extraction.

关键词： learning(artificial intelligence) medical applications medical signal processing robotics

Revealing the role of CCoAOMT1: fine-tuning bHLH transcription factors for optimal anther development

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

Science China(Life Sciences) 2024年第3期67卷 565-578页

作者： Zesen Lai Jianzheng Wang ying Fu Menghan Wang Hong Ma shiqing Peng Fang Chang State Key Laboratory of Genetic Engineering Ministry of Education Key Laboratory of Biodiversity Sciences and Ecological Engineering and Institute of Biodiversity SciencesInstitute of Plant BiologySchool of Life SciencesFudan UniversityShanghai 200438China School of Tropical Agriculture and Forestry Agriculture-Rural Affairs and Rural RevitalizationHainan UniversityHaikou 570228China Key Laboratory of Biology and Genetic Resources of Tropical Crops Ministry of AgricultureInstitute of Tropical Bioscience and BiotechnologyChinese Academy of Tropical Agricultural SciencesHaikou 571101China Department of Biology Huck Institutes of the Life SciencesPennsylvania State UniversityUniversity ParkPA 16802USA

The tapetum,a crucial innermost layer encompassing male reproductive cells within the anther wall,plays a pivotal role in normal pollen *** transcription factors (TFs) bHLH010/089/091 redundantly facilitate the rapid nuclear accumulation of DYSFUNCTIONAL TAPETUM 1,a gatekeeper TF in the ***,the regulatory mechanisms governing the activity of bHLH010/089/091 remain *** this study,we reveal that caffeoyl coenzyme A O-methyltransferase 1 (CCoAOMT1) is a negative regulator affecting the nuclear localization and function of bHLH010 and bHLH089,probably through their K259 *** findings underscore that CCoAOMT1 promotes the nuclear export and degradation of bHLH010 and ***,elevated CCoAOMT1 expression resulted in defective pollen development,mirroring the phenotype observed in bhlh010 bhlh089 ***,our investigation revealed that the K259A mutation in the bHLH089 protein disrupted its translocation from the nucleus to the cytosol and impeded its degradation induced by ***,transgenic plants with the probHLH089::bHLH089^(K259A)construct failed to rescue proper pollen development or gene expression in bhlh010 bhlh089 ***,these findings emphasize the need to maintain balanced TF homeostasis for male *** firmly establish CCoAOMT1 as a pivotal regulator that is instrumental in achieving equilibrium between the induction of the tapetum transcriptional network and ensuring appropriate anther development.

关键词： anther development nuclear localization bHLH O-methyltransferase transcription factor homeostasis

体外传代培养成体大鼠骨髓间充质干细胞生物学特性的观察

在线全文

学校读者我要写书评

暂无评论

中华病理学杂志 2007年第8期36卷 550-554页

作者：于晓霞石英爱辛颖张丽红李玉林吴珊吉林大学病理生物学教育部重点实验室长春130021

目的观察成体大鼠骨髓间充质干细胞(MSC)体外培养过程中生物学特性的改变,为骨髓间充质干细胞的应用研究提供实验依据。方法成体大鼠骨髓 MSC 的分离培养,流式细胞仪观察 MSC 免疫表型及细胞周期,检测细胞的诱导分化能力以及细胞的生长... 详细信息

目的观察成体大鼠骨髓间充质干细胞(MSC)体外培养过程中生物学特性的改变,为骨髓间充质干细胞的应用研究提供实验依据。方法成体大鼠骨髓 MSC 的分离培养,流式细胞仪观察 MSC 免疫表型及细胞周期,检测细胞的诱导分化能力以及细胞的生长曲线,TRAP-ELISA 方法检测其端粒酶活性。结果体外培养的成体大鼠 MSC,随着传代次数的增加,长梭形细胞的体积逐渐增大。第4代时免疫表型阳性细胞率分别为 CD29:(94.75±3.68)%,CD71:(95.43±2.23)%,CD90:(98.08±3.88)%;当传到第7代时,阳性细胞率仅为 CD29:(50.00±3.35)%,CD71:(50.70±2.43)%,CD90:(48.60±2.83)%;第9代时 MSC 检测不到任何阳性免疫表型。前5代 MSC 增殖较快,第3代时处于 S 期和 G_2/M 期的细胞比例为(38.36±2.01)%,处于 G_0/G_1期细胞为(61.64±2.13)%;第7代以后细胞增殖能力明显降低,第12代时处于 S 期和 G_2/M 期的细胞为(10.83±1.63)%,而 G_0/G_1期的细胞为(89.17±1.96)%,此时 MSC 已经基本停止增长。当体外培养的 MSC传到第9代以后,在成骨和成脂肪诱导体系作用下,细胞丧失了分化为 Von Kossa 法染色和油红 O 染色阳性细胞的能力;同时其端粒酶活性也随着传代次数的增多由最初的(52.7±0.78)%逐渐降低为阴性。结论体外培养的成体大鼠骨髓 MSC 随着传代次数的增加,其生物学特性发生明显改变。

关键词：间质干细胞端粒,末端转移酶细胞周期生物学标记

Design of High Performance MXene/Oxide Structure Memristors for Image Recognition Applications

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2024年第2期33卷 336-345页

作者： Xiaojuan LIAN Yuelin shi Xinyi SHEN Xiang WAN Zhikuang CAI Lei WANG The College of Integrated Circuit Science and Engineering Nanjing University of Posts and Telecommunications The National and Local Joint Engineering Laboratory of RF Integration and Micro-Assembly Technology Nanjing University of Posts and Telecommunications

Recent popularity to realize image recognition by memristor-based neural network hardware systems has been witnessed owing to their similarities to neurons and ***,the stochastic formation of conductive filaments inside the oxide memristor devices inevitably makes them face some drawbacks,represented by relatively higher power consumption and severer resistance switching *** this work,we design and fabricate the Ag/MXene（Ti3C2）/SiO2/Pt memristor after considering the stronger interactions between Ti3C2and Ag ions,which lead to a Ti3C2/SiO2structure memristor owning to much lower "SET" voltage and smaller resistance switching fluctuation than pure ***,the conductances of the Ag/Ti3C2/SiO2/Pt memristor have been modulated by changing the number of the applied programming pulse,and two typical biological behaviors,i.e.,longterm potentiation and long-term depression,have been ***,device conductances are introduced into an integrated device-to-algorithm framework as synaptic weights,by which the MNIST hand-written digits are recognized with accuracy up to 77.39%.

关键词： Performance evaluation Silicon compounds Image recognition Power demand Memristors Switches Programming

Predictors of Global Disparities in COVID-19 Vaccination Coverage — 219 Countries and Territories, December 2020–July 2022

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

China CDC weekly 2024年第15期6卷 318-323,I0006,I0007页

作者： ying Zhang Shujie Zang Xu Zhang Zhiqiang Qu Xinyu Zhou Leesa Lin Zhiyuan Hou School of Public Health and Global Health InstituteFudan UniversityShanghaiChina Department of Infectious Disease Epidemiology London School of Hygiene&Tropical MedicineLondonUnited Kingdom Laboratory of Data Discovery for Health(D24H) Hong Kong Science ParkHong Kong Special Administrative RegionChina

What is already known about this topic?The significant disparities in global coronavirus disease 2019(COVID-19)vaccine coverage hamper the pace of epidemic *** is a need to better understand the factors contributing to disparities in COVID-19 vaccination rates across *** is added by this report?This report revealed significant associations between vaccination coverage and various country-level *** pandemic preparedness,higher levels of trust,and a lower proportion of young population aged 0–14 were strongly correlated with higher COVID-19 vaccination *** are the implications for public health practices?Our findings emphasize the need for enhanced pandemic preparedness and governance,coupled with building trust in government and healthcare *** also needs to address the hesitancy of vaccinating children and adolescents aged 0–14 as the vaccination campaign progresses.

关键词： vaccination vaccine COV

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

从设计层面探讨预应力砼连续箱梁桥裂缝控制

重庆交通学院学报 2005年第4期24卷 13-18页

作者：施颖郑建群浙江工业大学建筑工程学院浙江杭州310014

预应力砼连续箱梁桥裂缝产生的原因是多种多样,但究其原因其根源无外乎来自设计、施工、管理养护和材料这4个层面.而设计是源头,把好设计关,即从设计思路、构造处理上加以注意和改进,从而使砼箱梁桥裂缝得到有效控制.

关键词：预应力砼连续箱梁桥设计构造裂缝

在线全文

学校读者我要写书评

暂无评论

某异形拱人行桥通行舒适度及其控制研究

浙江工业大学学报 2017年第5期45卷 495-500页

作者：施颖张振宇姚君孙沪浙江工业大学建筑工程学院浙江杭州310014 浙江交科工程检测有限公司浙江杭州310000

综合对比了国内外规范对于人行桥通行舒适度的规定,并以一座异形拱人行桥为研究背景,利用大型通用有限元分析软件Midas civil建立背景工程的有限元模型;参考德国人行桥设计规范中的舒适度评价方法对人行桥进行舒适度评价,并利用调谐质... 详细信息

综合对比了国内外规范对于人行桥通行舒适度的规定,并以一座异形拱人行桥为研究背景,利用大型通用有限元分析软件Midas civil建立背景工程的有限元模型;参考德国人行桥设计规范中的舒适度评价方法对人行桥进行舒适度评价,并利用调谐质量阻尼器对人行桥进行减振设计.通过对背景工程进行舒适度评价和减振设计,得到一些实用设计分析有益的结果,分析结果表明:本工程在一般的正常使用情况下振动舒适性满足要求;当桥面上行人密度过大,行人交通荷载繁忙的极端状况下时,振动舒适性不能满足要求;采用TMD消能减振装置后,桥梁结构的动力响应均达到建议的峰值加速度范围以内,满足振动舒适性要求.

关键词：异形拱人行桥通行舒适度有限元减振耗能调谐质量阻尼器

在线全文

学校读者我要写书评

暂无评论

中国记者协会办公楼平移工程施工技术

建筑技术 2010年第9期41卷 791-794页

作者：郝军李仕英王虹晔马东瑾师勇泛华建设集团有限公司北京100022 联安国际建筑设计有限公司北京100048

中国记者协会办公楼建于1922年,是北京市级文物保护建筑。按规划要求需平移62.87 m,并旋转4.1°。平移施工前,对墙、梁、柱及整体进行了加固,制定了整体切割托换方案,平移过程顺利,用时仅75 d,避免了拆除重建造成的污染。

关键词：文物保护建筑平移工程结构加固