检索结果-南通市图书馆

Journal of Advanced Ceramics 2023年第3期12卷 487-497页

作者： Lixiang Lai zhihao Zhao Shuo Tian bao Ou Gaoyuan Liang Bin Li Yejing Dai School of Materials Sun Yat-sen UniversityShenzhen 518107China

(Bi_(0.5)Na_(0.5))TiO_(3)(BNT)-based lead-free piezoceramics exhibit excellent electric field-induced strain(electrostrain)properties,but often suffer from large hysteresis and poor fatigue resistance,which strongly limit their ***,textured Nb5+-doped 0.8(Bi_(0.5)Na_(0.5))TiO_(3)–0.2(Bi_(0.5)K_(0.5))TiO_(3)(0.8BNT–0.2BKT)ceramics with a high degree of texturing(~80%)were prepared by the reactive template grain growth(RTGG)method using Bi4Ti3O12 as a *** the combination of donor doping in the B-site and the RTGG method,the electrostrain performance achieves a significant enhancement.A high electrostrain of 0.65%and a piezoelectric coefficient(*33 d)of 1083 pm/V with reduced hysteresis at an electric field of 6 kV/mm are *** electrostrain performance degradation is observed after unipolar electric field loading of 10^(5)cycles,showing excellent fatigue *** results indicate that the texturing BNT-based lead-free piezoceramics by the RTGG method is a useful approach to developing eco-friendly actuators.

关键词： (Bi_(0.5)Na_(0.5))TiO_(3)(BNT)-based ceramics donor doping electrostrain textured ceramics

上海城市更新背景下保留历史建筑的修复与利用——以五坊园四期51-17为例

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

住宅科技 2022年第6期42卷 20-24页

作者：暴智浩上海南房(集团)有限公司

上海城市建设已进入内涵式发展,中心城区以城市更新为主要发展模式。由于诸多历史文化风貌区内的局部地块亟待更新,如何平衡风貌保护和现代功能需求是目前的重要课题。文章以五坊园四期51-17保留历史建筑为例,从规划布局、平面改造、立... 详细信息

上海城市建设已进入内涵式发展,中心城区以城市更新为主要发展模式。由于诸多历史文化风貌区内的局部地块亟待更新,如何平衡风貌保护和现代功能需求是目前的重要课题。文章以五坊园四期51-17保留历史建筑为例,从规划布局、平面改造、立面修复、构件保留等多个维度,分析探讨保留历史建筑修复与利用的要点,以期为类似项目实践提供参考。

关键词：城市更新历史文化风貌区保留历史建筑修复与利用

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

内生真菌对高羊茅种子耐干旱能力的影响

塔里木大学学报 2016年第2期28卷 12-17页

作者：陈志豪刘学锋鲍根生李晓霞纪剑强陈水红塔里木大学动物科学学院新疆阿拉尔843300 新疆生产建设兵团第十四师一牧场新疆策勒848306 青海省畜牧兽医科学院青海西宁810016 塔里木大学生命科学学院新疆阿拉尔843300

禾草内生真菌广泛的存在于禾本科植物体内,他们不会引起植物任何感病症状,内生真菌侵染对植株生长有促进作用、且具有提高植物抵抗生物和非生物胁迫能力。本研究以感染内生真菌和非感染内生真菌高羊茅种子为研究对象,研究不同浓度PEG600... 详细信息

禾草内生真菌广泛的存在于禾本科植物体内,他们不会引起植物任何感病症状,内生真菌侵染对植株生长有促进作用、且具有提高植物抵抗生物和非生物胁迫能力。本研究以感染内生真菌和非感染内生真菌高羊茅种子为研究对象,研究不同浓度PEG6000胁迫处理下,带菌和不带菌种子萌发能力差异。结果表明:在高羊茅种子萌发时,用PEG-6000模拟干旱胁迫种子,感染内生真菌高羊茅种子的发芽率和胚根长均高于非感染种子的,说明内生真菌浸染能够提高高羊茅种子萌发时的耐旱能力。带菌高羊茅将会更好的适应干旱环境。

关键词：内生真菌高羊茅抗旱性发芽率

Deterministic and replaceable transfer of silver flakes for microcavities

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2023年第3期18卷 139-146页

作者： Tingting Wang zhihao Zang Yuchen Gao Kenji Watanabe Takashi Taniguchi Wei bao Yu Ye State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking UniversityBeijing 100871China Collaborative Innovation Center of Quantum Matter Beijing 100871China Research Center for Functional Materials National Institute for Materials Science1-1 NamikiTsukuba305-0044Japan International Center for Materials Nanoarchitectonics National Institute for Materials Science1-1 NamikiTsukuba305-0044Japan Electrical&Computer Engineering University of Nebraska-LincolnLincolnNE 68588USA Yangtze Delta Institute of Optoelectronics Peking UniversityNantong 226010China

How to fabricate high-quality microcavities simply and at low cost without causing damage to environmentally sensitive active layers such as perovskites are crucial for the studies of exciton–polaritons,however,it remains challenging in the field of microcavity ***,once the top mirror is deposited,the detuning of the microcavity is fixed and there is no easy way to tune ***,we have developed a method for deterministically transferring silver mirrors,which is relatively simple and guarantees the active layer from damaging of high temperature,particle bombardment,etc.,during the deposition of the top ***,with the help of a glass probe,we demonstrate a replaceable silver transfer method to tune the detuning of the microcavity,thereby changing the coupling of photons and excitons *** developed deterministic and replaceable silver mirror transfer methods will provide the capability to fabricate high-quality and tunable microcavities and play an active role in the development of the exciton–polariton field.

关键词： silver microcavity transfer perovskite

在线全文

学校读者我要写书评

暂无评论

细直径聚硅氮烷纤维的碘蒸气不熔化机理

浙江理工大学学报（自然科学版） 2023年第2期49卷 198-205页

作者：鲍之豪李晓鸿李金霞罗小雨张潇陈浩陈建军浙江理工大学材料科学与工程学院杭州310018

为探究聚硅氮烷纤维的碘蒸气不熔化机理,以甲基二氯硅烷和二甲基二氯硅烷为原料,采用先驱体转化法制备了直径为6.5μm的连续细直径聚硅氮烷(Polysilazane,PSZ)纤维,采用碘蒸气不熔化来制备PSZ交联纤维。利用凝胶液相色谱仪、扫描电子显... 详细信息

为探究聚硅氮烷纤维的碘蒸气不熔化机理,以甲基二氯硅烷和二甲基二氯硅烷为原料,采用先驱体转化法制备了直径为6.5μm的连续细直径聚硅氮烷(Polysilazane,PSZ)纤维,采用碘蒸气不熔化来制备PSZ交联纤维。利用凝胶液相色谱仪、扫描电子显微镜、傅里叶变换红外光谱仪、热重分析仪、X射线光电子能谱仪、X射线衍射仪和电子单纤维强力仪对PSZ纤维的化学结构、微观形貌、相组成和拉伸强度进行表征,探讨PSZ纤维的不熔化机理。结果表明:在80℃的条件下,碘蒸气不熔化仅需3 h即可将PSZ纤维转化为交联纤维,交联纤维经高温热解后得到抗拉强度为(1.53±0.27)GPa的SiCN陶瓷纤维。在交联过程中,Si—H和N—H被碘脱氢,在空气氛中重组为Si—O—Si和N—I,这有助于PSZ纤维的不熔化。与空气不熔化相比,该方法具有不熔化温度低,不熔化效率高等优点。

关键词：先驱体转化法聚硅氮烷交联纤维碘蒸气不熔化不熔化机理不熔化效率

Short-term effects of fine particulate matter constituents on myocardial infarction death

在线全文

学校读者我要写书评

暂无评论

环境科学学报:英文版 2023年第11期133卷 60-69页

作者： Shaocai Mo Jianlin Hu Chuanhua Yu Junzhe bao zhihao Shi Peixuan Zhou Zhiming Yang Siqi Luo Zhouxin Yin Yunquan Zhang Department of Epidemiology and Biostatistics School of Public HealthWuhan University of Science and TechnologyWuhan 430065China Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution ControlNanjing University of Information Science&TechnologyNanjing 210044China Department of Epidemiology and Biostatistics School of Public HealthWuhan UniversityWuhan 430071China Department of Epidemiology and Biostatistics School of Public HealthZhengzhou UniversityZhengzhou 450001China School of Economics and Management University of Science and Technology BeijingBeijing 100083China Hubei Province Key Laboratory of Occupational Hazard Identification and Control Wuhan University of Science and TechnologyWuhan 430065China

Existing evidence suggested that short-term exposure to fine particulate matter(PM_(2.5))may increase the risk of death from myocardial infarction(MI),while PM_(2.5) constituents responsible for this association has not been *** collected 12,927 MI deaths from 32 counties in southern China during 2011–***-level exposures of ambient PM_(2.5) and its 5 constituents(i.e.,elemental carbon(EC),organic carbon(OC),sulfate(SO_(4)^(2-)),ammonium(NH_(4)^(+)),and nitrate(NO_(3)^(-)))were aggregated from gridded datasets predicted by Community Multiscale Air Quality Modeling *** employed a space-time-stratified casecrossover design and conditional logistic regression models to quantify the association of MI mortality with short-term exposure to PM_(2.5) and its constituents across various lag *** the study period,the daily mean PM_(2.5) mass concentration was 77.8(standard deviation(SD)=72.7)μg/m^(3).We estimated an odds ratio of 1.038(95%confidence interval(CI):1.003-1.074),1.038(1.013-1.063)and 1.057(1.023-1.097)for MI mortality associated with per interquartile range(IQR)increase in the 3-day moving-average exposure to PM_(2.5)(IQR=76.3μg/m 3),EC(4.1μg/m^(3))and OC(9.1μg/m^(3)),*** did not identify significant association between MI death and exposure to water-soluble ions(SO_(4)^(2-),NH_(4)^(+)and NO_(3)^(-)).Likelihood ratio tests supported no evident violations of linear assumptions for constituents-MI *** analyses showed stronger associations between MI death and EC/OC exposure in the elderly,males and cold ***-term exposure to PM_(2.5) constituents,particularly those carbonaceous aerosols,was associated with increased risks of MI mortality.

关键词： Air pollution Particulate constituents Myocardial infarction Case-crossover study

在线全文

学校读者我要写书评

暂无评论

原位覆盖控制沉积物磷释放效果的验证评估

环境科学与技术 2024年第4期47卷 140-151页

作者：王增龙吴志皓王书航姜霞李艳华田雨桐包牧仁王前勇庞博敖文呼伦贝尔市北方寒冷干旱地区内陆湖泊研究院内蒙古呼伦贝尔021008 中国环境科学研究院湖泊生态环境研究所湖泊水污染治理与生态修复技术国家工程实验室北京100012 中国环境科学研究院湖泊生态环境研究所国家环境保护湖泊污染控制重点实验室北京100012

文章通过覆盖材料(方解石、湖沙或方解石+湖沙)对底泥磷释放的阻控实验以及利用梯度扩散薄膜(DGT)的底泥原位测试,验证评估覆盖剂对呼伦湖沉积物磷的生态修复效果。结果发现:(1)方解石、方解石+湖沙或湖沙能有效降低表层沉积物的DGT-P浓... 详细信息

文章通过覆盖材料(方解石、湖沙或方解石+湖沙)对底泥磷释放的阻控实验以及利用梯度扩散薄膜(DGT)的底泥原位测试,验证评估覆盖剂对呼伦湖沉积物磷的生态修复效果。结果发现:(1)方解石、方解石+湖沙或湖沙能有效降低表层沉积物的DGT-P浓度(CDGT(PO_(4)^(3-)-P)),沉积物/水界面扩散通量和上覆水溶解反应性磷;方解石、方解石+湖沙覆盖的表层沉积物的CDGT(PO_(4)^(3-)-P)峰值或平均值明显低于对照样;方解石、方解石+湖沙的上覆水DRP的去除率分别超过78%和81%;方解石+湖沙可以将沉积物/水界面无机磷扩散通量降低至负值;(2)方解石和方解石+湖沙能明显地降低表层沉积物总磷(TP)、活性磷(NH_(4)Cl-P和BD-P)含量及其占TP的百分比,沉积物反应性磷再补给系数r减少而惰性成份(NaOH_(85)-P和Ca-P)及其占TP的百分比增加;(3)方解石+湖沙覆盖的表层沉积物TP变化范围:-45~-30 mg/kg;磷提取相(NH_(4)Cl-P、BD-P、Ca-P和NaOH_(85)-P)含量变化值,磷提取相变化量占对照沉积物对应提取成份的百分比分别为-17~-10 mg/kg (-38.46%~-29.31%);-23~-16 mg/kg (-46.15%~-32.86%);10~15 mg/kg (2.41%~3.63%)和8~14 mg/kg(3.20%~3.99%);r降低范围:0.02~0.19。综上,方解石的吸附或阻隔作用能降低沉积物总磷和活性磷,降低沉积物磷再补给能力;NH_(4)Cl-P和BD-P被转化为情性成份(NaOH_(85)-P和Ca-P),磷迁移性降低。覆盖剂对沉积物磷内源负荷控制效果为方解石+湖沙>方解石>湖沙。方解石+湖沙的磷阻控机制是方解石对磷的吸附,磷和方解石的共沉淀以及湖沙的物理阻隔;方解石+湖沙的多层覆盖是一种应用价值较高的沉积物原位修复技术。

关键词：原位覆盖方解石梯度扩散薄膜沉积物/水界面内源负荷

Short-term exposure to fine particulate matter constituents and mortality:case-crossover evidence from 32 counties in China

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2022年第12期65卷 2527-2538页

作者： Peixuan Zhou Jianlin Hu Chuanhua Yu Junzhe bao Siqi Luo zhihao Shi Yang Yuan Shaocai Mo Zhouxin Yin Yunquan Zhang Department of Epidemiology and Biostatistics School of Public HealthWuhan University of Science and TechnologyWuhan 430065China Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution ControlNanjing University of Information Science&TechnologyNanjing 210044China Department of Epidemiology and Biostatistics School of Public HealthWuhan UniversityWuhan 430071China Department of Epidemiology and Biostatistics College of Public HealthZhengzhou UniversityZhengzhou 450001China Hubei Province Key Laboratory of Occupational Hazard Identification and Control Wuhan University of Science and TechnologyWuhan 430065China

A growing number of studies associated increased mortality with exposures to specific fine particulate(PM_(2.5))constituents,while great heterogeneity exists between *** China,evidence linking PM_(2.5)constituents and mortality was extensively *** study primarily aimed to quantify short-term associations between PM_(2.5)constituents and non-accidental mortality among the Chinese *** collected daily mortality records from 32 counties in China between January 1,2011,and December 31,*** concentrations of main PM_(2.5)constituents(organic carbon(OC),elemental carbon(EC),nitrate(NO_(3)^(-)),sulfate(SO_(4)^(2−)),and ammonium(NH_(4)^(+)))were estimated using the modified Community Multiscale Air Quality ***-stratified case-crossover design with conditional logistic regression models was adopted to estimate mortality risks associated with short-term exposures to PM_(2.5)mass and its *** analyses were done by sex,age,and season.A total of 116,959 non-accidental deaths were ***_(2.5)concentrations on the day of death were averaged at 75.7μg m^(−3)(control day:75.6μg m^(−3)),with an interquartile range(IQR)of 65.2μg m^(−3).Per IQR rise in PM_(2.5),EC,OC,NO_(3)^(-),SO_(4)^(2−),and NH_(4)^(+)at lag-04 day was associated with an increase in non-accidental mortality of 2.4%(95%confidence interval,(1.0–3.7),1.7%(0.8–2.7),2.9%(1.6–4.3),2.1%(0.4–3.9),1.0%(0.2–1.9),and 1.6%(0.3–2.9),*** PM_(2.5)mass and its constituents were strongly associated with elevated cardiovascular mortality risks,but only PM_(2.5),EC,and OC were positively associated with respiratory mortality at lag-3 ***_(2.5)mass and its constituents associated effects on mortality varied among sex-and age-specific *** in the seasonal pattern of associations exist among PM_(2.5)constituents,with stronger effects related to EC and NO_(3)^(-)in warm months but SO_(4)^(2−)and NH_(4)^(+)in cold ***-term

关键词： PM_(2.5)constituents mortality case-crossover design China

基坑爆破开挖爆点位置与基坑高度对爆破振动影响研究

在线全文

学校读者我要写书评

暂无评论

中外公路 2024年第2期44卷 214-219页

作者：刘宽徐志豪汤渊沈俊包小华沈平欢欧阳上海隧道工程有限公司上海市200232 深圳大学土木与交通工程学院广东深圳518060 广东长正建设有限公司广东珠海519000

针对基坑爆破振动预测不准确的问题,该文采用有限元模拟软件,深入研究基坑爆破开挖时爆点位置和基坑高度对振动的影响。首先,基于妈湾跨海隧道基坑爆破开挖工程进行数值模拟,验证模型的适用性;随后在保持爆心距不变的情况下,通过调整基... 详细信息

针对基坑爆破振动预测不准确的问题,该文采用有限元模拟软件,深入研究基坑爆破开挖时爆点位置和基坑高度对振动的影响。首先,基于妈湾跨海隧道基坑爆破开挖工程进行数值模拟,验证模型的适用性;随后在保持爆心距不变的情况下,通过调整基坑爆破点到基坑边缘的距离和基坑的高度,研究这两个因素对地表振动的影响。研究结果表明:随着爆破点到基坑边缘的距离增加,相应距离测点的振动速度逐渐减小;基坑高度越高,相应距离测点的振动速度越大;基坑高度对地表振速的影响要大于爆点位置的影响。研究成果能为基坑爆破的振动预测提供一定参考,具有工程实际意义。

关键词：基坑爆破振动数值模拟爆点位置基坑高度

Measurement of the neutron total cross section of^(9)Be at the Back-n white neutron source of CSNS

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2024年第8期48卷 140-152页

作者： Jiangbo Bai Jingyu Tang Liqun Shi Yonghao Chen Han Yi Jie bao Yu bao Ping Cao Haolei Chen Zhen Chen Zengqi Cui Ruirui Fan Changqing Feng Keqing Gao Xiaolong Gao MinHao Gu Changcai Han Guozhu He Yongcheng He Yang Hong Yiwei Hu Hanxiong Huang Xiru Huang Haoyu Jiang Wei Jiang Zhijie Jiang Hantao Jing Ling Kang Bo Li Chao Li Jiawen Li Qiang Li Xiao Li Yang Li Jie Liu Shubin Liu Ze Long Guangyuan Luan Changjun Ning Mengchen Niu Binbin Qi Jie Ren Xichao Ruan Zhaohui Song Kang Sun Zhijia Sun Zhixin Tan Xinyi Tang Binbin Tian Lijiao Wang Pengcheng Wang Zhaohui Wang Xiaoguang Wu Xuan Wu Likun Xie Xiaoyun Yang Li Yu Tao Yu Yongji Yu Guohui Zhang Linhao Zhang Qiwei Zhang Xianpeng Zhang Yuliang Zhang Zhiyong Zhang Luping Zhou zhihao Zhou Kejun Zhu Institute of Modern Physics Fudan UniversityShanghai 200433China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026China Sate Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China State Key Laboratory of Particle Detection and Electronics Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Northwest Institute of Nuclear Technology Xi’an 710024China University of Chinese Academy of Sciences Beijing 100049China

The neutron total cross section data of^(9)Be are essential in the nuclear structure model research of light nuclei and nuclear power *** neutron total cross section of^(9)Be in the 0.3 eV−120 MeV energy region has been measured using time-of-flight and transmission methods with the Neutron Total Cross Sectional Spectrometer(NTOX)based on the multi-cell fast fission chamber at the China Spallation Neutron Source(CSNS)-Back-n white neutron source(Back-n).The fission count-neutron energy distributions of ^(235)U and ^(238)U without samples and with Be samples with three thicknesses were measured in the double-bunch operation mode for a beam power of 100 *** Bayesian method was used to eliminate the influence of the double-bunch problem on neutron measurement in the energy region above 10 *** neutron total cross section of^(9)Be results was consistent with ENDF/B-VIII.0 evaluation library data in the 0.3 eV−20 MeV energy *** the energy ranges of 0.3 eV to 10 keV and 0.01 to 20 MeV,the deviations between our results and the evaluation results of ENDF/B-VIII.0 were within 2.5%and 15%,*** the resonance energy region,the measured resonance energies in our experiment were 0.63,0.82,and 2.8 MeV,*** results showed that the total cross section uncertainties of three Be samples were within 2.2%in the energy region below 1 *** total cross section uncertainty of 30 mm Be from ^(235)U was the smallest and less than 5%in the energy region of 0.3 eV−120 *** results of this experiment can provide technical support for further data analysis and related nuclear data evaluation.

关键词： ^(9)Be neutron total cross section CSNS Back-n time-of-flight method transmission method multi-cell fast fission chamber