检索结果-南通市图书馆

Frontiers of Environmental Science & Engineering 2024年第9期18卷 51-66页

作者： Xiaolong Yao Kuan Wan wenxin yu Zheng Liu School of Ecology and Environment Beijing Technology and Business UniversityBeijing 100048China State Environmental Protection Key Laboratory of Food Chain Pollution Control Beijing Technology and Business UniversityBeijing 100048China School of Resources Environment and MaterialsGuangxi UniversityNanning 530004China

Volatile organic compounds(VOC)have been proven to cause considerable harm to both the ecological environment and human *** VOC emissions are primarily generated by the industrial *** utilization of porous carbon as an adsorbent has emerged as an effective method for the efficient removal of VOC from industrial ***,during the actual production processes,VOC exhaust gases are often mixed with water vapor,which poses challenges for adsorption *** review provides a comprehensive overview of the remarkable advancements in various carbon materials in terms of their ability to adsorb both VOC and water ***,it systematically summarizes the influence of surface groups on adsorbents and the molecular properties of VOC on their adsorption by carbon ***,this review introduces the mechanism underlying adsorption-adsorbent interactions and discusses the construction of models for adsorbing water vapor and *** challenges associated with the application of carbon materials for VOC adsorption in humid environments are also *** review aims to offer theoretical and technical guidance for the effective purification of moist VOC waste gases emitted from industrial sources,thereby achieving precise control of VOC emissions.

关键词： Adsorption Water vapor Carbon-based adsorbents Surface functional groups VOC properties

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

不同基质配比对短叶对齿藓植物生长的影响

南京林业大学学报（自然科学版） 2024年第4期48卷 184-190页

作者：于雯馨贺晓雷少刚寇瑾冯超内蒙古农业大学草原与资源环境学院农业部饲草栽培、加工与高效利用重点实验室草地资源教育部重点实验室内蒙古呼和浩特010011 中国矿业大学环境与测绘学院江苏徐州221116 东北师范大学生命科学学院吉林长春130024

【目的】对齿藓属(Didymodon)作为典型的耐旱藓类植物,是沙漠、沙地和黄土丘陵区生物结皮的优势植物。探究不同配比基质对短叶对齿藓(***)生长的影响,为短叶对齿藓的快速繁殖提供理论依据。【方法】以短叶对齿藓为试验材料,选取泥炭土... 详细信息

【目的】对齿藓属(Didymodon)作为典型的耐旱藓类植物,是沙漠、沙地和黄土丘陵区生物结皮的优势植物。探究不同配比基质对短叶对齿藓(***)生长的影响,为短叶对齿藓的快速繁殖提供理论依据。【方法】以短叶对齿藓为试验材料,选取泥炭土、珍珠岩、蛭石3种材料为培养基质,通过测定分析短叶对齿藓的盖度、密度及叶绿素含量的变化,研究不同配比基质对短叶对齿藓植物生长的影响。【结果】不同配比基质对短叶对齿藓的盖度、密度等均产生不同的影响。在泥炭土与蛭石体积比2∶1基质处理下,短叶对齿藓盖度、植株密度达到最大(盖度为70.67%,植株密度为12.2株/cm^(2)),并且该处理下测定的叶绿素含量最高,为2.157 mg/g。【结论】综合分析不同配比基质处理下短叶对齿藓的生长指标和生理指标,泥炭土与蛭石体积比2∶1基质处理最有助于短叶对齿藓的生长,该基质配比可适用于短叶对齿藓的快速繁殖。

关键词：短叶对齿藓基质配比人工培养叶绿素含量

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

基于悬挂式FBG的螺栓连接微小扭矩检测

光子学报 2024年第4期53卷 130-138页

作者：饶春芳陈鹏胡友德詹学峰姜子薇王跃翔余文鑫江西师范大学物理与通信电子学院江西省光电子与通信重点实验室南昌330000 江西省人民医院口腔科南昌330000 比亚迪股份有限公司深圳510000

将光纤布拉格光栅通过尾纤悬挂在带螺栓连接的结构件表面,使用结构动态检测法测试螺栓连接结构的扭矩。测试中,在待测结构件上产生周期性的振动,在振动的作用下尾纤中产生周期性应变,它作为波源在刻有布拉格光纤光栅的光纤中形成应力波... 详细信息

将光纤布拉格光栅通过尾纤悬挂在带螺栓连接的结构件表面,使用结构动态检测法测试螺栓连接结构的扭矩。测试中,在待测结构件上产生周期性的振动,在振动的作用下尾纤中产生周期性应变,它作为波源在刻有布拉格光纤光栅的光纤中形成应力波,布拉格光纤光栅感知应力波形成测试信号。在识别过程中,首先使用经验模态分解方法对测试信号进行分解以去除不平稳分量及噪声,然后提取信号的有量纲和无量纲特征值,最后将这些特征值输入基于支持向量机的识别系统。结果表明,该方法识别正确率达97.2%,扭矩识别能力在N·cm量级。本研究开拓了一种新的螺栓连接状态的检测方法,尤其适用于小质量结构中微小扭矩的检测。

关键词：螺栓扭矩识别结构动态检测悬挂式光纤布拉格光栅经验模态分解支持向量机

应急状态下城市基层社区韧性治理能力提升研究

在线全文

学校读者我要写书评

暂无评论

荆楚学刊 2024年第3期25卷 46-54页

作者：于文鑫王开元中国海洋大学国际事务与公共管理学院山东青岛266100 山东科技大学文法学院山东青岛266590

韧性治理作为一种全新的治理理念和治理范式,对于城市基层社区摆脱传统治理经验逻辑和固有模式的路径依赖,增强应急状态下的治理效能具有重要的指导价值。当前,我国的政策环境和实践尝试为探索基层社区韧性治理积累了丰富的理论和实践经... 详细信息

韧性治理作为一种全新的治理理念和治理范式,对于城市基层社区摆脱传统治理经验逻辑和固有模式的路径依赖,增强应急状态下的治理效能具有重要的指导价值。当前,我国的政策环境和实践尝试为探索基层社区韧性治理积累了丰富的理论和实践经验,同时也暴露了众多基层社区在危机面前“韧性不足”的问题。为了确保社区能够承受突发事件和风险的冲击,必须在社区层面构建“多元共治”的协同治理体系,增强居民参与社区自治的意愿,强化应急物资保障和供给,利用数字技术赋能“智慧社区”建设,从而提升基层社区的韧性治理能力,实现城市的可持续稳定发展。

关键词：应急法治韧性治理基层社区多元共治技术赋能

Analysis of a multi-component system with double threshold control policy

在线全文

学校读者我要写书评

暂无评论

Journal of Control and Decision 2021年第3期8卷 343-352页

作者： Wenqing Wu Gang He wenxin yu Mengxin Wang Kang Xu School of Science Southwest University of Science and TechnologyMianyangPeople’s Republic of China Visual Computing and Virtual Reality Key Laboratory of Sichuan Province Sichuan Normal UniversityChengduPeople’s Republic of China School of Computer Science and Technology Southwest University of Science and TechnologyMianyangPeople’s Republic of China Zhongtai Securities Institute of Financial Studies Shandong UniversityShandongPeople’s Republic of China

This paper investigates a multi-component repairable system with double threshold control *** system is composed of n identical and independent components which operate simultaneously at the beginning,and it is down when the number of operating components decreases to k−1(k≤n).When the number of failed components is less than the value L,the repairman repairs them with a low repair *** high repair rate is activated as soon as L failed components present,and continues until the number of failed components drops to the value N−*** the matrix analytical method,the Laplace transform technique and the properties of the phase type distribution,various performance measures including the availability,the rate of occurrence of failures,and the reliability are derived in transient and stationary ***,numerical examples are reported to show the behaviour of the system.

关键词： Multi-component system double threshold control policy matrix analytical method reliability measures

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

用于火箭炮炮口振动测量的机械滤波器设计

火炮发射与控制学报 2024年第3期45卷 31-37页

作者：罗世建张波涛余文鑫刘志鹏万晨宋双婧南京理工大学机械工程学院江苏南京210094 中国兵器工业集团江山重工研究院有限公司湖北襄阳441057

为了减小火箭炮炮口振动测量时应力波的干扰,设计了一种机械滤波器。通过对组建的落球试验系统进行试验,验证了应力波会影响加速度传感器的测量结果,解释了机械滤波器的滤波机理。通过扫频试验研究了机械滤波器的频率响应特性,其频率响... 详细信息

为了减小火箭炮炮口振动测量时应力波的干扰,设计了一种机械滤波器。通过对组建的落球试验系统进行试验,验证了应力波会影响加速度传感器的测量结果,解释了机械滤波器的滤波机理。通过扫频试验研究了机械滤波器的频率响应特性,其频率响应特性与理论计算相符合。通过对比分析加速度传感器在安装和未安装机械滤波器两种情况下所采集的振动加速度的时域、频域信号,结果显示机械滤波器在火箭炮炮口振动测量中有着良好的滤波效果。对加速度的积分运算表明机械滤波器在一定程度上提高了振动测试的精度,火箭炮振动测试时安装机械滤波器是有必要的。

关键词：机械滤波器振动加速度测试应力波加速度积分

石灰-纯碱软化法在废水除硬单元的设计参数探讨

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

冶金动力 2024年第5期 95-99页

作者：曹宗政余文馨王森磊叶思齐何流中冶赛迪工程技术股份有限公司重庆佳环节能环保科技有限公司重庆401122

钢铁企业常规生产废水总硬度较高,为了避免硬度物质在废水回用或者后续处理过程中浓缩富集,发生结垢问题,可在预处理系统中采用石灰-纯碱软化法去除废水中硬度物质。在详细介绍某钢铁厂生产废水除硬单元设计要点的基础上,为避免系统结... 详细信息

钢铁企业常规生产废水总硬度较高,为了避免硬度物质在废水回用或者后续处理过程中浓缩富集,发生结垢问题,可在预处理系统中采用石灰-纯碱软化法去除废水中硬度物质。在详细介绍某钢铁厂生产废水除硬单元设计要点的基础上,为避免系统结垢和污堵,对除硬机理、工艺设计、药剂选择及调试过程进行了深入分析。

关键词：总硬度除硬单元药剂石灰-纯碱软化法

在线全文

学校读者我要写书评

暂无评论

非线性铣削时滞系统最优控制

山东师范大学学报（自然科学版） 2024年第1期39卷 33-42页

作者：于文鑫翟金刚刘长霞孙军龙鲁东大学数学与统计科学学院山东烟台264025 鲁东大学交通学院山东烟台264025

针对铣刀铣削过程中的时滞现象,为减小颤振,以执行器施加的平衡力为决策变量,以平衡力和铣削颤振位移为性能指标,构建了时滞系统最优控制模型。首先,通过时间尺度变换,将不固定终端时刻转化为固定终端时刻;其次,利用控制参数法,将其转... 详细信息

针对铣刀铣削过程中的时滞现象,为减小颤振,以执行器施加的平衡力为决策变量,以平衡力和铣削颤振位移为性能指标,构建了时滞系统最优控制模型。首先,通过时间尺度变换,将不固定终端时刻转化为固定终端时刻;其次,利用控制参数法,将其转化为参数优化问题;再次,使用协态方法,得到了性能指标和约束关于优化变量的梯度;最后,构造了序列二次规划(SQP)优化算法求解近似优化问题。

关键词：最优控制时滞控制参数化铣削系统

Angiogenesis and proliferation of endothelial cells in hypertrophic and nodular port-wine stain

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Plastic and Reconstructive Surgery 2021年第3期3卷 141-146页

作者： wenxin yu Jiafang Zhu Lizhen Wang Gang Ma Xiaoxi Lin Department of Laser and Aesthetic Medicine Shanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineShanghai 200011China Shanghai Key Laboratory of Stomatology Department of Oral PathologyShanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineShanghai 200011China Department of Oral Pathology Shanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineShang

Background:Port-wine stain(PWS)has been classified not as the hyperplasia of cells,but rather,as an expansion of malformed ***,previous studies have reported upregulated expression of proangiogenic factors in *** studies have indicated that the pathology exhibits proliferation of numerous endothelial cells in hypertrophic/nodular *** study aimed to determine the expression of vascular epithelial growth factor(VEGF),matrix metalloproteinase-9(MMP-9),angiopoietin-2(ANG-2),and basic fibroblast growth factor(bFGF)in hypertrophic ***:Immunohistochemistry was used to analyze skin samples from 33 patients with hypertrophic *** levels of VEGF,MMP-9,ANG-2,and bFGF in hypertrophic PWS were determined by multiplying the intensity by the percentage of immunoreactive *** scores were classified as follows:negative(0),low(1),moderate(2,3,and 4),or high(6).Results:Based on pathological characteristics,hypertrophic PWS was divided into vascular malformation and pyogenic granuloma(PG)***,MMP-9,ANG-2,and bFGF were significantly activated in the blood vessels of PG-type PWS samples compared with their counterparts in blood vessels of vascular malformation-type PWS samples and ***-type hypertrophic PWS,which exhibited proliferation of endothelial cells,showed the strongest ***:The exuberant proliferation of endothelial cells in PG-type hypertrophic PWS may be associated with the regulation of proangiogenic factors during *** proangiogenic factors that function in the angiogenesis and proliferation of endothelial cells may play an important role in the pathogenesis and progression of ***,these factors may be dynamic and behave differently in various types of hypertrophic PWS.

关键词： Port-wine stain Capillary malformation Hypertrophy Nodule Angiogenesis Proliferation Pathology

Market Rule or Equal Opportunity Rule:An Empirical Analysis Based on Acquisitions of Chinese Listed Companies

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science and Information 2024年第2期12卷 191-211页

作者： Wenting CHEN wenxin LIU Pengyi yu Guangdong University of Foreign Studies Guangzhou 510006China

This paper examines the data of A-share listed companies in China from 2002 to 2017,drawing on the theory of equal opportunity and market rules in M&A *** paper investigates the correlation between changes in tender offer policy and M&A tendencies and *** findings suggest that following the policy shift and the adoption of market rules,companies that secure an exemption from the mandatory tender offer obligation not only exhibit stronger M&A tendencies but also improved long-term M&A *** indicates that market rules are more suitable for China and contribute to enhancing the efficiency of the M&A *** paper also presents evidence of a moderating effect,demonstrating that exemptions from the mandatory tender offer obligation positively influence the relationship between policy change and M&A ***,this paper finds that state-owned and large-scale firms tend to exhibit a higher degree of M&A tendencies.

关键词： takeover regulation equal opportunity rule market rule mandatory tender offer