检索结果-南通市图书馆

Microwave awakening the n-π^(*) electronic transition in highly crystalline polymeric carbon nitride nanosheets for photocatalytic hydrogen generation

引用

Journal of Energy Chemistry 2022年第2期31卷 541-547页

作者： Xiangang Lin Haiwei Du Daochuan Jiang Peng Zhang zhiwu Yu Hong Bi Yupeng Yuan School of Chemistry and Chemical Engineering Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized MaterialsAnhui UniversityHefei 230601AnhuiChina Key Laboratory of Structure and Functional Regulation of Hybrid Materials(Anhui University) Ministry of EducationHefei 230601AnhuiChina High Magnetic Field Laboratory CAS Key Laboratory of High Magnetic Field and Ion Beam Physical BiologyHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031AnhuiChina School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001HenanChina

The n-π^(*) electronic transition in polymeric carbon nitride(PCN)can remarkably harvest visible light,which thus potentially promotes the photocatalytic hydrogen H2 ***,awaking the n-π^(*) lectronic transition has proven to be a grand ***,we reported on the awakening of n-π^(*) electronic transition by microwave thermolysis of urea pellet,which yielded the PCN with absorption edge of 600 nm,near 140 nm red-shift from 460 nm of pristine *** n-π^(*) electronic transition endows PCN with an increased photocata lytic H_(2) generation,with a highest H_(2) rate of 61.7μmol h^(-1) under visible light exposure,which is near 6 times higher than that by using the PCN from the thermolysis of urea pellets in an electric furnace(10.6μmol h^(-1)).Furthermore,the n-π^(*) transition in PCN leads to the longest wavelength of 535 nm that can initiate H2 generation,remarkably longer than the absorption edge of pristine PCN(460 nm).This work manifests the advantages of microwave sintering route to awaken the n-π^(*) electronic transition in PCN for an increased photocata lytic performance.

关键词： Polymeric carbon nitride Microwave n-π^(*)electronic transition Hydrogen

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

Bioinspired Strategies for Excellent Mechanical Properties of Composites

引用

Journal of Bionic Engineering 2022年第5期19卷 1203-1228页

作者： Xianchang Peng Binjie Zhang Ze Wang Wenbo Su Shichao Niu zhiwu Han Luquan Ren Key Laboratory of Bionic Engineering Ministry of EducationJilin University130022 ChangchunChina Weihai Institute for Bionics Jilin UniversityWeihai 264200China School of Mechanical and Aerospace Engineering Jilin UniversityChangchun 130022China

Developing high-performance composite materials is of great significance as a strong support for high-end ***,the design and optimization of composite materials lack a theoretical basis and guidance *** with traditional composite materials,natural materials are composed of relatively limited components but exhibit better mechanical properties through ingenious and reasonable synthetic *** on this,learning from nature is considered to be an effective way to break through the bottleneck of composite design and *** this review,the recent progress of natural composites with excellent properties is *** factors,including structures,components and interfaces,are first summarized to reveal the strategies of natural materials to achieve outstanding mechanical *** addition,the manufacturing technologies and engineering applications of bioinspired composite materials are ***,some scientific challenges and outlooks are also proposed to promote next-generation bioinspired composite materials.

关键词： Bioinspired Composites Mechanical properties Manufacturing technologies Engineering application

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

综合科考船风机室高效低噪声协同控制研究

引用

舰船科学技术 2024年第14期46卷 38-42页

作者：蔡晓涛叶林昌刘媛王毅娜刘赟黄志武船舶与海洋工程特种装备和动力系统国家工程研究中心上海201108 中国船舶集团有限公司第七一一研究所上海201108

为降低机舱风机振动噪声传递到船体结构和附近舱室,需要对其进行高效低噪声控制。本文结合某综合科考船风机室的布置,分析风机隔振处理、壁面吸声处理、消声器设置等措施的协同作用效果,并进行实船测试验证。实船结果表明,风机室通过低... 详细信息

为降低机舱风机振动噪声传递到船体结构和附近舱室,需要对其进行高效低噪声控制。本文结合某综合科考船风机室的布置,分析风机隔振处理、壁面吸声处理、消声器设置等措施的协同作用效果,并进行实船测试验证。实船结果表明,风机室通过低噪声协同控制措施后,机舱风机减振装置有较好的隔振效果,隔振效果可达15 dB以上;风机室百叶窗出口1 m处噪声声压级低于“开敞娱乐区域”75 dB(A)的限值要求。该研究可为船舶风机室的低噪声协同控制提供理论参考,具有一定的工程指导意义。

关键词：风机室低噪声协同控制科考船

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

Seasonal and spatial variations of kinematic parameters of internal solitary waves in the Andaman Sea

引用

Acta Oceanologica Sinica 2022年第4期41卷 14-22页

作者： Yuqi Wu Jieshuo Xie Jiexin Xu zhiwu Chen Yinghui He Shuqun Cai State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China University of Chinese Academy of Sciences Beijing 100049China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China Institution of South China Sea Ecology and Environmental Engineering Chinese Academy of SciencesGuangzhou 510301China Marine Development Planning and Research Center of Guangdong Province Guangzhou 510220China

The horizontally variable density stratification and background currents are taken into the variable-coefficent extended Korteweg-de Vries(evKdV)theory to obtain the geographical and seasonal distribution of kinematic parameters of internal solitary waves in the Andaman Sea(AS).The kinematic parameters include phase speed,dispersion parameter,quadratic and cubic nonlinear *** shows that the phase speed and dispersion parameter are mainly determined by the topographic feature and have limited seasonal *** maximum phase speed is 2.6 m/s,which occurs in the cool season(November)in the middle of the AS,while the phase speed in the cool season is slightly larger than those in other seasons,up to 11.4%larger than that in the rainy season(July)in the southern *** dispersion parameter in the cool season can be 22.3%larger than that in the hot *** nonlinear parameters have significant seasonal variation,and they can even change their signs at the continental slope in the north of the AS,from season to ***,the algebraic solitons dominate in the AS with minimum amplitudes(aal)ranging from 0.1 m to 102 m,and the maximum aal occurs in the cool season in the southern *** effect of the background flow on the parameters is also *** background flow has a great influence on the nonlinear parameters,e.g.,the value of cubic nonlinear parameter can be reduced by 1/3 when the background flow is not considered.

关键词： internal solitary waves kinematic parameters evKdV theory Andaman Sea

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

艾司氯胺酮联合纳布啡用于剖宫产术后镇痛对产后抑郁及镇痛效果的影响

引用

中华疼痛学杂志 2024年第1期20卷 91-96页

作者：卢俊军杨芳潘志豪刘志武中国人民解放军联勤保障部队第九七〇医院麻醉与围手术医学科山东省烟台市264002

目的观察艾司氯胺酮联合纳布啡用于剖宫产术后镇痛对产后抑郁及镇痛效果的影响。方法收集中国人民解放军联勤保障部队第九七〇医院2023年1月至4月妇产科行择期剖宫产术的产妇120例,年龄22~35岁,体重指数(BMI)20.9~35.1 kg/m^(2),ASA分级... 详细信息

目的观察艾司氯胺酮联合纳布啡用于剖宫产术后镇痛对产后抑郁及镇痛效果的影响。方法收集中国人民解放军联勤保障部队第九七〇医院2023年1月至4月妇产科行择期剖宫产术的产妇120例,年龄22~35岁,体重指数(BMI)20.9~35.1 kg/m^(2),ASA分级Ⅰ/Ⅱ级。采用随机数字表法将其随机分为两组:艾司氯胺酮联合纳布啡组(L组)和单纯纳布啡组(N组),每组60例。两组产妇均于L_(3~4)间隙行腰麻与硬膜外联合麻醉,腰麻给予0.5%布比卡因2 ml,阻滞平面控制在T_(4~6),统一向头端置入硬膜外导管,若麻醉效果欠佳,可经硬膜外腔给予0.5%罗哌卡因5~10 ml。两组产妇术后均给予静脉自控镇痛泵(PCIA),L组术后镇痛药物方案:盐酸艾司氯胺酮1 mg/kg+纳布啡0.5 mg/kg+托烷司琼10 mg,以生理盐水稀释至150 ml;N组用纳布啡0.6 mg/kg+托烷司琼10 mg,以生理盐水稀释至150 ml。记录两组产妇术后2、4、6、12、24、36、48 h的静息视觉模拟评分(VAS)和运动VAS评分;记录产妇术前1 d与术后2、4、6、12、24、36、48 h Ramsay镇静评分;记录两组产妇术后1、3、5、7 d爱丁堡产后抑郁量表(EPDS)的抑郁评分;记录两组产妇术后静脉自控镇痛泵追加按压次数;统计两组产妇术后VAS评分0~3分的例数及术后药物不良反应发生率。结果L组产妇术后1、3、5、7 d的EPDS抑郁评分依次为(5.4±0.8)、(6.0±0.6)、(6.2±0.8)、(6.8±0.8),N组组产妇术后1、3、5、7 d的产后爱丁堡产后抑郁量表抑郁评分依次为(6.0±0.9)、(8.4±1.8)、(8.6±1.6)、(8.7±1.4),L组产妇术后1、3、5、7 d的EPDS评分均低于N组,差异均具有统计学意义(P0.05)。L组产妇术后12、24、36、48 h Ramsay镇静评分高于N组,差异均具有统计学意义(P均<0.05)。结论艾司氯胺酮联合纳布啡用于产妇剖宫产术后镇痛,具有更好的镇痛、镇静作用,减轻产妇术后运动疼痛;艾司氯胺酮具有明显的抗抑郁作用,保护产妇心理健康,降低产妇术后抑郁的发生。

关键词：艾司氯胺酮纳布啡剖宫产术抑郁症,产后疼痛,手术后镇痛

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

不同时相服用清燥救肺汤加减方对防治放射性肺损伤的影响

引用

吉林中医药 2024年第5期44卷 544-548页

作者：王静易宣洪汪萍王志武唐山市人民医院河北唐山063000

目的探讨不同时相服用清燥救肺汤加减方对防治放射性肺损伤(RILI)的影响。方法将111例放射性肺损伤患者按就诊顺序随机分为治疗1组、治疗2组、治疗3组,各37例,3组均进行常规药物治疗,并给予清燥救肺汤加减方,治疗1组给药时间为放疗前1 h... 详细信息

目的探讨不同时相服用清燥救肺汤加减方对防治放射性肺损伤(RILI)的影响。方法将111例放射性肺损伤患者按就诊顺序随机分为治疗1组、治疗2组、治疗3组,各37例,3组均进行常规药物治疗,并给予清燥救肺汤加减方,治疗1组给药时间为放疗前1 h,治疗2组给药时间为放疗结束后1 h,治疗3组给药时间为放疗开始与结束后1 h内,比较3组中医证候评分、卡氏功能评分(KPS)、放射性肺损伤程度、肺功能、相关生化指标水平。结果3组放疗后中医证候评分均高于放疗前(P<0.05),且与治疗2组、治疗3组比较,治疗1组升高幅度较小(P<0.05);3组KPS评分均低于放疗前,且与对治疗2组、治疗3组比较,治疗1组升降低幅度较小(P<0.05);3组放射性肺损伤程度比较,治疗1组与治疗3组的总发生率较低,与治疗2组比较,差异有统计学意义(P<0.05);3组放疗后用力肺活量(FVC)、第1秒用力呼吸容积(FEVl)、第1秒用力呼吸容积/用力肺活量(FEVl/VC)、肿瘤坏死因子-α(TNF-α)、C反应蛋白(CRP)、转化生长因子-β1(TGF-β1)水平均低于放疗前,且与对治疗2组、治疗3组比较,治疗1组降低幅度较小(P<0.05)。结论运用清燥救肺汤加减方防治放射性肺损伤疗效显著,但需在放疗前1 h给药。

关键词：时相清燥救肺汤放疗放射性肺损伤

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

Unbalanced variation after assembly and double-speed influence coefficient method in the threshing drum

引用

International Journal of Agricultural and Biological Engineering 2023年第6期16卷 1-10页

作者： zhiwu Yu Yaoming Li Lizhang Xu Xiaoxue Du Kuizhou Ji Key Laboratory of Modern Agricultural Equipment and Technology Ministry of EducationJiangsu UniversityZhenjiang 212013JiangsuChina School of Agricultural Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina

Though the component of threshing drum is pre-balancing on the factory,the drum after assembly still has the problem of unbalanced *** this study,the unbalance mechanism produced by assembly are introduced and the centroid propagation model in the series rotation system was *** influence of the eccentricity and assembly phase on the assembly unbalance was *** is shown that there was a superposition effect between the initial centroid eccentricity caused by the machining error and the centroid eccentricity caused by assembly error,the unbalance amount under the in-phase assembly was larger than that of the anti-phase ***,the unbalance variation was experimentally investigated using in-field balancing detection on the test rig and combine *** experiment results showed the excellent vibration reduction effect of in-field balancing,which showed a reduction of 83.0%and 85.8%.In order to increase the range of in-field balance detection and reduce the calculation error,the double-speed influence coefficient method was *** proposed method adopted the way of first low-speed pre-balancing,and then high-speed precision balance,taking advantage of vibration information at two speeds and avoids nonlinear vibration conditions caused by high unbalanced ***,the double-speed influence coefficient method was verified on the test *** vibration reduction effect of proposed method was better than the traditional method.

关键词： unbalance variation assenmbly threshing drum centroid propagation

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

Bioinspired flexible piezoresistive sensor for high-sensitivity detection of broad pressure range

引用

Bio-Design and Manufacturing 2023年第3期6卷 243-254页

作者： Meng Wang Hao Zhang Han Wu Suqian Ma Lei Ren Yunhong Liang Chunbao Liu zhiwu Han Center of Reproductive Medicine Center of Prenatal DiagnosisThe First Hospital of Jilin UniversityChangchun 130021China The Key Laboratory of Bionic Engineering Ministry of EducationJilin UniversityChangchun 130025China School of Mechanical and Aerospace Engineering Jilin UniversityChangchun 130025China

The human skin has the ability to sense tactile touch and a great range of ***,in prosthetic or robotic systems,it is necessary to prepare pressure sensors with high sensitivity in a wide measurement range to provide human-like tactile ***,we developed a flexible piezoresistive pressure sensor that is highly sensitive in a broad pressure range by using lotus leaf micropatterned polydimethylsiloxane and multilayer *** superposing four layers of micropatterned constructive substrates,the multilayer piezoresistive pressure sensor achieves a broad pressure range of 312 kPa,a high sensitivity of 2.525 kPa^(−1),a low limit of detection(LOD)of<12 Pa,and a fast response time of 45 *** with the traditional flexible pressure sensor,the pressure range of this sensor can be increased by at least an order of *** flexible piezoresistive pressure sensor also shows high robustness:after testing for at least 1000 cycles,it shows no sign of *** importantly,these sensors can be potentially applied in various human motion detection scenarios,including tiny pulse monitoring,throat vibration detection,and large under-feet pressure *** proposed fabrication strategy may guide the design of other kinds of multifunctional sensors to improve the detection performance.

关键词： Bionic Piezoresistive pressure sensor Microstructure Multilayer Wide pressure range

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

基于直接概率积分法的列车-轨道-桥梁系统随机分析

引用

铁道科学与工程学报 2024年第2期21卷 669-680页

作者：刘虎兵宋力徐磊蒋丽忠余志武中南大学土木工程学院湖南长沙410075 高速铁路建造技术国家工程研究中心湖南长沙410075

由于施工和制造误差使得铁路工程结构参数不可避免地具有不确定性,同时作为系统主要自激励的轨道不平顺亦具有明显的随机性和时变性,因此,探明不确定因子对列车和轨道-桥梁结构动态性能的影响非常重要。为了高效地完成列车-轨道-桥梁系... 详细信息

由于施工和制造误差使得铁路工程结构参数不可避免地具有不确定性,同时作为系统主要自激励的轨道不平顺亦具有明显的随机性和时变性,因此,探明不确定因子对列车和轨道-桥梁结构动态性能的影响非常重要。为了高效地完成列车-轨道-桥梁系统随机性能分析,建立列车-轨道-桥梁空间振动分析模型,采用轨道不平顺概率模型和谱表达-随机函数的方式在有限随机变量空间中实现轨道不平顺随机过程的高效模拟。引入概率密度积分方程和直接概率积分法发展了列车-轨道-桥梁系统随机动力方程和相应的计算求解策略。基于MATLAB实现了列车-轨道-桥梁随机振动的直接概率积分法分析程序,计算了全概率不平顺激励和参数随机条件下车-轨-桥系统振动响应的均值、标准差和时变的概率密度信息。研究结果表明:与概率密度演化分析方法相比,直接概率积分法可较好地反映行车过程中系统响应的概率密度特征,然而其在系统响应随机后处理时更为高效,其效率可提高1~2个数量级。此外,考虑轨道不平顺全概率激励更能准确地反映行车过程系统响应的概率特征,平均概率谱可能使得计算结果偏于保守;行车速度对于列车和桥梁动态行为的影响是显著的,随着行车速度的增加系统响应的范围逐渐变大。研究结果进一步拓展了列车-轨道-桥梁随机系统的分析方法,可以高效地用于系统状态评估和设计优化。

关键词：直接概率积分法列车-轨道-桥梁相互作用随机分析谱表达-随机函数法

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

Novel carbon-nitride based catalysts for enhanced CH_(4) reforming under visible light: From morphology to heterojunction design principles

引用

能源化学:英文版 2023年第8期83卷 423-432,I0011页

作者： Yufei Huang Ding Wei Ziyi Li Yu Mao Yangqiang Huang Bo Jin Xiao Luo zhiwu Liang Joint International Center for CO_(2)Capture and Storage(iCCS) The Engineering Research Center of Advanced CatalysisMinistry of Education ProvincialHunan Key Laboratory for Cost-effective Utilization of Fossil Fuel Aimed at Reducing CO_(2)EmissionsCollege of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082HunanChina

The synthesis of high value-added chemical products using CO_(2)and CH_(4)is a promising CO_(2)conversion technology that can reduce greenhouse gas emissions while also alleviating the energy ***,problems such as high energy consumption and strict reaction conditions in reforming process hinder the further development of the *** this work,carbon-nitrogen based composites were prepared for the first time according to the design principle from morphology to heterojunction,which is innovatively applied in the process of photocatalytic ***,C_(3)N_(4)materials with different dimensions(D) are prepared and applied to a CO_(2)-CH_(4)photocatalytic ***,the 2D/2D TiO_(2)/g-C_(3)N_(4)heterostructure is constructed with the ultrasonic impregnation method to further improve charge generation,transfer,and separation *** is worth noting that the yield of CO reaches173.80 μmol g^(-1),and the catalytic performance is improved by 1546% compared to bulk C_(3)N_(4).Moreover,the physical and chemical properties of 2D/2D TiO_(2)/g-C_(3)N_(4)materials are studied using a variety of cha racterization ***,the work fu nction and adsorption energy of different C3N4/TiO_(2)models for CO_(2)adsorption are calculated by density functional theory(DFT).Then,a possible catalytic mechanism for photocatalytic CO_(2)and CH_(4) conversion is proposed based on DFT calculations and experimental *** work provides a new technical route for the rapid conversion of CO_(2)and CH_(4) at room temperature,as well as a new research concept for achieving carbon neutrality.

关键词： Photocatalytic CO_(2) CH_(4) 2D/2DTiO_(2)/g-C_(3)N_(4) Conversion

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：