检索结果-南通市图书馆

同方期刊数据库

在线全文

学校读者我要写书评

暂无评论

多源数据融合的土性参数预测方法

浙江工业大学学报 2024年第4期52卷 430-436页

作者：汪明元陈松庭王耿鑫彭成威李欣益浙江华东建设工程有限公司浙江杭州310014 中国电建集团华东勘测设计研究院有限公司浙江杭州311122 浙江工业大学土木工程学院浙江杭州310023

场地勘察是岩土工程建设中至关重要的环节,静力触探测试(Cone penetration test,CPT)和多通道表面波试验(Multi-channel analysis of surface waves,MASW)分别是常用的岩土工程勘察和地球物理探测方法,两种方法各有优势和局限性。首先,... 详细信息

场地勘察是岩土工程建设中至关重要的环节,静力触探测试(Cone penetration test,CPT)和多通道表面波试验(Multi-channel analysis of surface waves,MASW)分别是常用的岩土工程勘察和地球物理探测方法,两种方法各有优势和局限性。首先,通过多源数据融合的土性参数预测方法将MASW试验获得的剪切波速(V S)转换为锥尖阻力(q_(c));然后,基于随机森林算法将转换结果与CPT获得的实测q_(c)相结合,从而实现对目标场地剖面上q_(c)的预测;最后,根据实测CPT参数采用准确性评价指标评价该预测方法的准确性。研究结果表明:V S与q_(c)之间有较强的相关性,采用转换模型将V S转换为q_(c)的预测准确性高于经验公式,所提方法能够有效预测目标场地的土性参数,相较于未融合MASW参数的预测模型,采用多源数据融合方法获得的模型准确性有所提升。

关键词： CPT MASW 土性参数随机森林数据融合

Experimental confirmation of the linear relation between plasma current and external vertical magnetic field in EXL-50 spherical torus energetic electron plasmas

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

Plasma Science and Technology 2024年第8期26卷 32-36页

作者：董力立王明远刘文军石跃江董家齐郭栋孙恬恬顾翔宋显明袁保山彭元凯 the ENN Team Hebei Key Laboratory of Compact Fusion Langfang 065001People’s Republic of China School of Mathematics and Physics Anqing Normal UniversityAnqing 246133People’s Republic of China ENN Science and Technology Development Co.Ltd. Langfang 065001People’s Republic of China

A three-fluid equilibrium plasma with bulk plasma and energetic electrons has been observed on the Xuanlong-50(EXL-50) spherical torus, where the energetic electrons play a crucial role in sustaining the plasma current and pressure. In this study, the equilibrium of a multi-fluid plasma was investigated by analyzing the relationship between the external vertical magnetic field(B_(V)),plasma current(I_(p)), the poloidal ratio(β_(p)) and the Shafranov formula. Remarkably, our research demonstrates some validity of the Shafranov formula in the presence of multi-fluid plasma in EXL-50 spherical torus. This finding holds significant importance for future reactors as it allows for differentiation between alpha particles and background plasma. The study of multi-fluid plasma provides a significant reference value for the equilibrium reconstruction of burning plasma involving alpha particles.

关键词： plasma equilibrium Shafranov formula multi-fluid plasma

餐饮外卖平台的环境保护义务与责任研究——以餐饮包装废弃物之污染防治为重心

在线全文

学校读者我要写书评

暂无评论

中国政法大学学报 2024年第3期 5-17页

作者：王明远陆星瑶清华大学法学院清华大学法学院环境资源能源法学研究中心

餐饮外卖行业大量使用一次性塑料餐具和包装盒,引发了复杂的环境污染问题。从现实状况看,我国的餐饮外卖包装废弃物污染防治面临着循环利用机制不健全、法律规范不完善等困境。从法理基础的角度看,餐饮外卖平台需承担包装废弃物污染防... 详细信息

餐饮外卖行业大量使用一次性塑料餐具和包装盒,引发了复杂的环境污染问题。从现实状况看,我国的餐饮外卖包装废弃物污染防治面临着循环利用机制不健全、法律规范不完善等困境。从法理基础的角度看,餐饮外卖平台需承担包装废弃物污染防治义务,其重要依据在于平台企业同时具有新型市场主体与规制主体的双重属性,明显不同于传统企业。在法律义务和责任层面,对于餐饮外卖包装废弃物所引发的环境侵权现象,外卖平台属于帮助行为人,以不同的侵权行为方式,与侵权卖家构成共同侵权中的帮助侵权,二者应承担连带责任。在道德义务和责任层面,应赋予外卖平台更高的环境保护伦理标准和要求。当然,基于功能主义的观点,可以强化餐饮平台企业的环境保护义务和责任,但这需要有一定的条件和限度,应综合考虑多种复杂因素,权衡外卖平台应承担的义务、责任及其实现方式。在今后的发展方向上,应借鉴德日等国相关制度和实践,完善我国的循环经济法律制度体系,加强生产者责任延伸制度,优化餐饮外卖包装废弃物污染防治制度措施。

关键词：外卖平台包装废弃物污染防治

Active ammonia-oxidizing bacteria and archaea in wastewater treatment systems

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2021年第4期33卷 273-282页

作者： Maosheng Zheng Shishi He Yueqi Feng mingyuan wang Yong-Xin Liu Chenyuan Dang Jiawen wang The Key Laboratory of Resources and Environmental Systems Optimization Ministry of EducationCollege of Environmental Science and EngineeringNorth China Electric Power UniversityBeijing 102206China CAS Center for Excellence in Biotic Interactions University of Chinese Academy of SciencesBeijing 100049China The Key Laboratory of Water and Sediment Sciences Ministry of EducationCollege of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China

Ammonia-oxidizing bacteria(AOB)and archaea(AOA)are two microbial groups mediating nitrification,yet little is presently known about their abundances and community structures at the transcriptional level in wastewater treatment systems(WWTSs).This is a significant issue,as the numerical abundance of AOA or AOB at the gene level may not necessarily represent their functional role in ammonia *** amo A genes as molecular markers,this study investigated the transcriptional abundance and community structure of active AOA and AOB in 14 *** PCR results indicated that the transcriptional abundances of AOB amo A(averaged:1.6×10^(8)copies g^(-1)dry sludge)were higher than those of AOA(averaged:3.4×10^(7)copies g^(-1)dry sludge)in all WWTSs despite several higher abundances of AOA amo A at the gene ***,phylogenetic analysis demonstrated that Nitrosomonas europaea and unknown clusters accounted for 37.66%and 49.96%of the total AOB amo A transcripts,respectively,suggesting their dominant role in driving ammonia ***,AOA amo A transcripts were only successfully retrieved from 3 samples,and the Nitrosospaera sister cluster dominated,accounting for 83.46%.Finally,the substrate utilization kinetics of different AOA and AOB species might play a fundamental role in shaping their niche differentiation,community composition,and functional *** study provides a basis for evaluating the relative contributions of ammonia-oxidizing microorganisms(AOMs)to nitrogen conversions in WWTSs.

关键词： Ammonia-oxidizing bacteria Ammonia-oxidizing archaea Transcriptional activity Community structure Wastewater treatment system

微织构对V型滑动导轨副摩擦磨损特性影响的研究

在线全文

学校读者我要写书评

暂无评论

制造技术与机床 2024年第2期 164-171页

作者：马岢欣邓建新包一琛王军燕田润洲王明远山东大学机械工程学院高效洁净机械制造教育部重点实验室山东济南250061

V型滑动导轨副具有低成本、良好的承载能力和导向性等优点,至今仍应用于很多机械设备中,但同时也存在着摩擦系数大、易磨损和低速稳定性差等缺点。为提高V型滑动导轨副的摩擦学性能,利用激光表面织构化技术分别在导轨的接触面上设计并... 详细信息

V型滑动导轨副具有低成本、良好的承载能力和导向性等优点,至今仍应用于很多机械设备中,但同时也存在着摩擦系数大、易磨损和低速稳定性差等缺点。为提高V型滑动导轨副的摩擦学性能,利用激光表面织构化技术分别在导轨的接触面上设计并制备直线和椭圆微织构。通过不同仿真软件对激光制备出的微织构是否产生流体动压效应进行验证,分析微织构对导轨接触面的接触应力的影响。利用自制往复滑动导轨试验平台在混合润滑条件下测试了不同类型织构化导轨副的摩擦磨损性能。结果表明,织构化导轨副均可以产生流体动压效应,且椭圆微织构可以产生更大的流体动压效应。此外,椭圆微织构仅位于下导轨表面可以较大程度降低其接触应力。因此,当椭圆微织构位于下导轨表面时减摩效果最好,具有最低的平均摩擦系数,与无织构导轨副相比下降了31.7%。

关键词： V型滑动导轨副微织构流体动压效应接触应力

新工科背景下基于OBE理念的《电路》课程的改革与实践

在线全文

学校读者我要写书评

暂无评论

时代汽车 2024年第12期 79-81页

作者：张优贤聂贞王明远河南工学院河南新乡453002 河南经贸职业学院河南郑州450046

依据新工科的基本要求,利用现代技术手段,结合学校立足河南、面向全国培养适应区域经济社会发展需要人才的办学理念,将基于学习产出的OBE理念应用于《电路》课程。从结果出发,从学生出发,从教学内容、教学模式、教学手段、考核方式等方... 详细信息

依据新工科的基本要求,利用现代技术手段,结合学校立足河南、面向全国培养适应区域经济社会发展需要人才的办学理念,将基于学习产出的OBE理念应用于《电路》课程。从结果出发,从学生出发,从教学内容、教学模式、教学手段、考核方式等方面对《电路》课程进行改革,形成与时俱进的教学方式,致力于提升学生的学习效果,搭建好《电路》基础课通往专业课的知识桥梁。优化教学内容,真正实现为专业服务、为社会发展服务;优化教学模式,与时俱进跟上时代步伐;优化教学手段,满足学生个性化需求;优化考核方式,调动学生的积极性。通过新工科背景下基于OBE理念的《电路》课程的改革与实践,真正突出学生主观能动性,提高教学效果,提升教学质量。

关键词：新工科 OBE理念教学改

青藏高原东北部地区城市PM_(2.5)和PM_(10)时空分布特征及气象因素的影响

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

西北地质 2024年第4期57卷 285-296页

作者：梁明武李慧婷李魏龙贾晓丹汪铭媛冯朝晖中国诚通生态有限公司北京100070 中国长江电力股份有限公司湖北武汉430071 中国地质调查局西安地质调查中心/西北地质科技创新中心陕西西安710119 中国科学院地理科学与资源研究所北京100101

随着工业化进程的迅速发展,大气污染问题已不容忽视,青藏高原东北部作为中国重要的生态安全战略地区,由于其常年多风的地理特点导致土地荒漠化,而土地荒漠化会带来颗粒物污染的问题。笔者以青藏高原东北部地区逐月可吸入颗粒物(PM_(10)... 详细信息

随着工业化进程的迅速发展,大气污染问题已不容忽视,青藏高原东北部作为中国重要的生态安全战略地区,由于其常年多风的地理特点导致土地荒漠化,而土地荒漠化会带来颗粒物污染的问题。笔者以青藏高原东北部地区逐月可吸入颗粒物(PM_(10))和细颗粒物(PM_(2.5))浓度为基础,分析了大气颗粒物PM_(2.5)和PM_(10)时空分布特征,与气象因素(降水量、气温和风速)之间的相关性及受气象因素的影响程度。结果表明:①东部人口密集和经济发达的西宁市、海东市和黄南州PM_(2.5)和PM_(10)较高,以上3个市州的PM_(2.5)平均水平分别为44.2μg/m^(3),44.7μg/m^(3)和36.5μg/m^(3),PM_(10)平均水平分别为99.1μg/m^(3),99.7μg/m^(3)和72.2μg/m^(3);2015~2019年的时间分布上各地区颗粒物浓度呈现逐年下降的趋势;空间分布表明PM_(2.5)呈现从西到东逐渐升高的趋势,PM_(10)则呈东高西低分布。②各地区气温和降水量的峰值均出现在夏季,呈现出“Λ”型的分布规律;而各地区的PM_(2.5)、PM_(10)逐月浓度变化整体呈现出“V”型的分布规律,非采暖季颗粒物浓度最低、采暖季颗粒物浓度最高。③各种气象因素的影响中,PM_(2.5)和PM_(10)与降水量、气温、风速均呈负相关,并且PM_(2.5)浓度受到风速的负向影响,而PM_(10)浓度受到风速的显著正向影响,表明风起扬尘对该区域大气污染贡献突出但风速与污染物浓度的作用机制复杂。本研究可为典型地区空气质量的改善与预测提供理论基础与参考依据。

关键词： PM_(2.5) PM_(10) 空气污染气象因素成因分析青藏高原东北部

Influence of surfactants used in surfactant-polymer flooding on the stability of Gudong crude oil emulsion

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2010年第2期7卷 263-267页

作者： Dong Zhaoxia Lin Meiqin wang Hao Li mingyuan Enhanced Oil Recovery Research Center China University of Petroleum Beijing 102249 China

The influences of an anionic-nonionic composite surfactant and petroleum sulfonate, used in surfactant-polymer flooding in Shengli Gudong oilfield, East China, on the interfacial properties of Gudong crude model oil and synthetic formation water was studied by measuring interfacial tension, interfacial viscoelasticity and Zeta potential. The in？ uence of the surfactants on the stability of Gudong water-in-oil （W/O） and oil-in-water （O/W） emulsions was evaluated by separating water from the W/O emulsion and residual oil in the aqueous phase of the O/W emulsion respectively. The results showed that the two kinds of surfactants, namely anionic-nonionic composite surfactant and petroleum sulfonate, are both able to decrease the interfacial tension between the oil phase and the aqueous phase and increase the surface potential of the oil droplets dispersed in the O/W emulsion, which can enhance the stability of the W/O and O/W crude oil emulsions. Compared with petroleum sulfonate, the anionic-nonionic composite surfactant is more interfacially active and able to enhance the strength of the interfacial film between oil and water, hence enhance the stability of the W/O and O/W emulsions more effectively.

关键词： Surfactant Gudong crude oil interfacial properties emulsion stability

Electrospun Cu-doped In_(2)O_(3) hollow nanofibers with enhanced H2S gas sensing performance

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2022年第3期11卷 427-442页

作者： Yu ZHANG Shuai HAN mingyuan wang Siwei LIU Guiwu LIU Xianfeng MENG Ziwei XU Mingsong wang Guanjun QIAO School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China SEU-FEI Nano-Pico Center Key Laboratory of MEMS of Ministry of EducationSchool of Electrical Science and EngineeringSoutheast UniversityNanjing 210096China

One-dimensional nanofibers can be transformed into hollow structures with larger specific surface area, which contributes to the enhancement of gas adsorption. We firstly fabricated Cu-doped In_(2)O_(3) (Cu-In_(2)O_(3)) hollow nanofibers by electrospinning and calcination for detecting H2S. The experimental results show that the Cu doping concentration besides the operating temperature, gas concentration, and relative humidity can greatly affect the H2S sensing performance of the In_(2)O_(3)-based sensors. In particular, the responses of 6%Cu-In_(2)O_(3) hollow nanofibers are 350.7 and 4201.5 to 50 and 100 ppm H2S at 250 ℃, which are over 20 and 140 times higher than those of pristine In_(2)O_(3) hollow nanofibers, respectively. Moreover, the corresponding sensor exhibits excellent selectivity and good reproducibility towards H2S, and the response of 6%Cu-In_(2)O_(3) is still 1.5 to 1 ppm H2S. Finally, the gas sensing mechanism of Cu-In_(2)O_(3) hollow nanofibers is thoroughly discussed, along with the assistance of first-principles calculations. Both the formation of hollow structure and Cu doping contribute to provide more active sites, and meanwhile a little CuO can form p–n heterojunctions with In_(2)O_(3) and react with H2S, resulting in significant improvement of gas sensing performance. The Cu-In_(2)O_(3) hollow nanofibers can be tailored for practical application to selectively detect H2S at lower concentrations.

关键词： electrospinning Cu-doped In_(2)O_(3) hollow nanofibers H2S detection