检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

城市固废填埋场开挖筛分再利用碳排放评估

中国环境科学 2024年第9期44卷 5044-5052页

作者：韦宇凡徐文杰彭毅陈云敏柯瀚詹良通余霖锋浙江大学软弱土与环境土工教育部重点实验室、浙江大学超重力研究中心浙江杭州310058 南京大学政府管理学院应急管理学系江苏南京210023

本文评估了填埋场开挖筛分再利用的碳排放和碳减排效益,该研究有利于健全我国在城市固废处理领域的碳排放计算体系.首先从流程角度分析,分类整理了每个过程的排放因子和减排因子等参数.其次,选取我国东部某大型城市固废填埋场为研究对象... 详细信息

本文评估了填埋场开挖筛分再利用的碳排放和碳减排效益,该研究有利于健全我国在城市固废处理领域的碳排放计算体系.首先从流程角度分析,分类整理了每个过程的排放因子和减排因子等参数.其次,选取我国东部某大型城市固废填埋场为研究对象,运用蒙特卡罗模拟进行了分析.结果显示,该填埋场的开挖减排量超过排放量,陈腐垃圾净排放平均值为-235.22kgCO_(2)-eq/t.此外,分析了排放与减排的主要来源,发现轻质物焚烧是排放的主要贡献者,而焚烧产生的电能和热力的回收是减排的主要来源.最后通过参数的敏感性分析,发现能量转化效率和净减排因子对减排结果有显著影响.

关键词：陈腐垃圾填埋场开挖碳排放碳减排资源回收

基于临床代谢组学与蛋白质组学研究粉葛治疗轻度血脂异常的作用机制

在线全文

学校读者我要写书评

暂无评论

中国中药杂志 2024年第10期49卷 2818-2827页

作者：易建云朱卫丰管咏梅周旭陈晓凡杨世林冯育林欧阳辉江西中医药大学中药固体制剂制造技术国家工程研究中心江西南昌330006 江西中医药大学现代中药制剂教育部重点实验室江西南昌330004 江西中医药大学循证医学研究中心江西南昌330004

研究粉葛临床上治疗轻度血脂异常潜在的代谢途径和作用靶点。采用UPLC-Q-TOF-MS和EASY-nLC-timsTOF-Pro2技术对轻度血脂异常患者在基线和服药12周后的血浆样品展开代谢组学和蛋白质组学研究。通过多元统计分析比较组间差异,并对轻度血... 详细信息

研究粉葛临床上治疗轻度血脂异常潜在的代谢途径和作用靶点。采用UPLC-Q-TOF-MS和EASY-nLC-timsTOF-Pro2技术对轻度血脂异常患者在基线和服药12周后的血浆样品展开代谢组学和蛋白质组学研究。通过多元统计分析比较组间差异,并对轻度血脂异常密切相关的代谢物和蛋白与临床血脂指标分别进行相关性分析,结合基因本体(Gene Ontology,GO)功能分析和京都基因与基因组百科全书(Kyoto Encyclopedia of Genes and Genomes,KEGG)通路富集分析结果,绘制粉葛治疗轻度血脂异常可能的作用途径和靶点。结果显示,粉葛治疗后患者血浆中共有56个差异代谢物和78个差异蛋白产生回调效应,包括脂质和糖代谢相关的蛋白或代谢物(ApoB-100、9,10-DHOME、GAPDH、PGK1、PGAM1、ENO1等)、炎症与氧化应激相关的蛋白或代谢物(氧化磷脂、PLA2G7、LTA4H等)。结果表明,粉葛治疗轻度血脂异常的作用机制可能与下调ApoB-100的过表达、激活PPARα/γ、促进脂肪和甘油的分解、缓解LTB4与氧化磷脂介导的氧化应激密切相关。

关键词：粉葛轻度血脂异常代谢组学蛋白质组学脂质代谢氧化应激

在线全文

学校读者我要写书评

暂无评论

大型射电望远镜主反射面调整方法研究

天文学报 2024年第2期65卷 42-52页

作者：孙正雄王锦清虞林峰张志斌王广利中国科学院上海天文台上海200030 中国科学院射电天文重点实验室南京210023 上海市空间导航与定位技术重点实验室上海200030 中国科学院大学北京100049

随着毫米波天文学和空间通信的重要性日益提高,对天线性能提出了越来越高的要求,而天线性能往往受到其反射器表面精度的限制.微波全息技术是一种快速有效的检测反射面天线表面轮廓的测量技术.通过微波全息测量得到天线口径场,计算天马65... 详细信息

随着毫米波天文学和空间通信的重要性日益提高,对天线性能提出了越来越高的要求,而天线性能往往受到其反射器表面精度的限制.微波全息技术是一种快速有效的检测反射面天线表面轮廓的测量技术.通过微波全息测量得到天线口径场,计算天马65m射电望远镜反射面与理想抛物面的偏差.天马65m射电望远镜的主反射面板是放射状的,有14圈.面板的每个角都固定在面板下方促动器的螺栓上进行上下移动,且相邻面板交点处的拐角共用一个促动器.采用平面拟合的方法可以计算各块面板拐角处的调整值,但是同一个促动器会得到4个不同的调整量.通过平面拟合,同时以天线照明函数为权重的平差计算方法得到相邻面板拐角的一个平差值,即天马65m射电望远镜1104个促动器的最佳调整值.通过多次调整和新算法的应用,天马65m射电望远镜反射面的面形精度逐渐提高到了0.24mm.

关键词：望远镜:射电,面形误差,天线效率方法:微波全息,数据分析

Hydro-mechanical response with respect to the air ventilation for water filtration in homogeneous soil

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2019年第11期16卷 2562-2576页

作者： Wei-lin LEE Yih-Chin TAI Chjeng-Lun SHIEH Kuniaki MIYAMOTO yu-feng lin Department of Hydraulic and Ocean Engineering National Cheng-Kung UniversityTainan 701TaiwanChina Graduate School of Life and Environmental Sciences University of TsukubaIbaraki 305-8577Japan

When water penetrates into soil,interstitial air can become trapped by the infiltrating *** the effect of air ventilation could cause deviations in the predicted pore water pressure and the associated effective *** study aims at the effect of air ventilation on the coupled hydro-mechanical responses in homogeneous soil during infiltration.A schematic concept of infiltration conditions(open-and closed-valve)in homogeneous soil is proposed for investigating their impacts on the pore water pressure and effective *** of vertical soil column filled with Ottawa sand(ASTM C77820/30)were designed for two types of air ventilation(namely,open and closed infiltration).The evolution of pore water pressure at the cylinder bottom was recorded,and served as a benchmark problem for evaluating the coupled hydro-mechanical *** with the commercial software,GeoStudio,was employed for the dynamic behaviors of pore-water and-air pressures as well as the evolving effective *** was found in both the experiments and numerical investigations that the infiltration condition plays a crucial role for the ascending rate of pore water pressure as well as the associated effective *** results illustrate the inevitable impacts of the air ventilation conditions on the mechanical properties of the soil during infiltration.

关键词： Water infiltration Air ventilation Schematic concept Soil column experiment Unsaturated soil mechanism GeoStudio

Observation of Resistive Switching Memory by Reducing Device Size in a New Cr/CrO_x/TiO_x/TiN Structure

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2015年第4期7卷 392-399页

作者： Debanjan Jana Subhranu Samanta Sourav Roy yu feng lin Siddheswar Maikap Thin Film Nano Tech. Lab. Department of Electronic Engineering Chang Gung University

The resistive switching memory characteristics of 100 randomly measured devices were observed by reducing device size in a Cr/Cr Ox/Ti Ox/Ti N structure for the first *** electron microscope image confirmed a viahole size of 0.4 lm.A 3-nm-thick amorphous Ti Oxwith 4-nm-thick polycrystalline Cr Oxlayer was observed.A small 0.4-lm device shows reversible resistive switching at a current compliance of 300 l A as compared to other larger size devices(1–8 lm)owing to reduction of leakage current through the Ti *** device-to-device uniformity with a yield of[85%has been clarified by weibull distribution owing to higher slope/shape *** switching mechanism is based on oxygen vacancy migration from the Cr Oxlayer and filament formation/rupture in the Ti *** read pulse endurance of[105cycles,good data retention of 6 h,and a program/erase speed of 1 ls pulse width have been obtained.

关键词： CrOx TiOx Resistive switching memory Slope/shape factor Device size

Preparation and Characterization of Carbon Nanotubes-Coated Cordierite for Catalyst Supports

在线全文

学校读者我要写书评

暂无评论

Journal of Natural Gas Chemistry 2006年第3期15卷 211-216页

作者： Jianmei Wang Rong Wang Xiujin yu Jianxin lin feng Xie Kemei Wei National Engineering Research Center of Chemical Fertilizer Catalyst Fuzhou University Fuzhou 350002 China

The carbon nanotubes-coated cordierite （CNTs-cordierite） was fabricated by pyrolysis of ethine on cordierite with iron catalyst, which was penetrated into the cordierite substrate by vacuum impregnation. The cordierite substrate, carbon naontubes, and CNTs-cordierite were characterized by SEM, TEM/HREM, BET, and TGA. The results show that the carbon nanotubes were distributed uniformly on the surface of cordierite. A significant increase in BET surface area and pore volume was observed, and a suitable pore-size distribution was obtained. On the CNTs-cordierite, carbon nanotubes penetrated into the cordierite substrate, which led to a remarkable stability of the CNTs against ultrasound maltreatment. Growth time is an important factor for thermostability and texture of the sample. The mass increased but the purity decreased with the growth time, which caused the exothermic peak shift to low temperature, and the corresponding full width half maximum （FWHM） of the peak in DTG increased.

关键词： carbon nanotube cordierite pyrolysis ethine catalyst support

Assessment of damage to buildings and farms during the 2011 M 9.0 earthquake and tsunami in Japan from remote sensing data

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2011年第20期56卷 2138-2144页

作者： GUO HuaDong CHEN yu feng Qiang lin QiZhong WANG Fei Center for Earth Observation and Digital Earth Chinese Academy of SciencesBeijing 100094China

At 13:46 on March 11,2011(Beijing time),a great earthquake of magnitude of 9.0 occurred off the Pacific coast of northeastern Japan(Tohoku Region).After the earthquake,the Center for Earth Observation and Digital Earth(CEODE),Chinese Academy of Sciences,quickly launched a major disaster emergency response to assess the *** this paper,we have extracted buildings and farms in the heavily devastated area that includes Iwate,Miyagi,and Fukushima Prefectures,based on multi-spectral remote sensing *** have assessed building damage by overlaying seismic intensity and building *** addition,we have assessed the extent of building and farm damage caused by the tsunami through the establishment of a tsunami impact assessment model that is based on terrain and distance from the *** results were partially verified by high-resolution images obtained after the *** results show that about 76% of buildings in Miyagi Prefecture were affected by seismic intensity 6 and above,with 24% of the buildings and 12% of the farms destroyed by the *** huge losses were echoes at lesser amounts in Fukushima and *** results provide the support of basic data,which can be further developed by economic and social aspects of the disaster assessment.

关键词：影响评估模型遥感数据建筑物大地震海啸农场数据损坏日本

Hybrid pedestrian positioning system using wearable inertial sensors and ultrasonic ranging

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第3期33卷 327-338页

作者： lin Qi yu Liu Chuanshun Gao Tao feng yue yu School of Communication and Information Engineering Chongqing University of Posts and TelecommunicationsChongqing 400065China Department of Land Surveying and Geo-Informatics The Hong Kong Polytechnic UniversityHong Kong 999077China

Pedestrian positioning system(PPS)using wearable inertial sensors has wide applications towards various emerging fields such as smart healthcare,emergency rescue,soldier positioning,*** performance of traditional PPS is limited by the cumulative error of inertial sensors,complex motion modes of pedestrians,and the low robustness of the multi-sensor collaboration *** paper presents a hybrid pedestrian positioning system using the combination of wearable inertial sensors and ultrasonic ranging(H-PPS).A robust two nodes integration structure is developed to adaptively combine the motion data acquired from the single waist-mounted and foot-mounted node,and enhanced by a novel ellipsoid constraint *** addition,a deep-learning-based walking speed estimator is proposed by considering all the motion features provided by different nodes,which effectively reduces the cumulative error originating from inertial ***,a comprehensive data and model dual-driven model is presented to effectively combine the motion data provided by different sensor nodes and walking speed estimator,and multi-level constraints are extracted to further improve the performance of the overall *** results indicate that the proposed H-PPS significantly improves the performance of the single PPS and outperforms existing algorithms in accuracy index under complex indoor scenarios.

关键词： Pedestrian positioning system Wearable inertial sensors Ultrasonic ranging Deep-learning Data and model dual-driven

New triterpenoid sapoin from Ardisia gigantifolia Stapf.

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2010年第4期21卷 449-452页

作者： Gong, Qiang Qiang Mu, Li Hua Liu, Ping Yang, Shi lin Wang, Bo feng, yu lin Gen Hosp PLA Dept Clin Pharmacol Beijing 100853 Peoples R China JiangXi Univ Tradit Chinese Med Nanchang 330006 Peoples R China

One new triterpenoid sapoin with two known triterpenoid sapoins:3β-O-{α-L-rhamnopyranosyl-(1→3)-[β-D-xylopyranose-(1→2)]-β-D-glucopyranosyl-(1→4)-α-L-arabinopyranosyl}-3β-hydroxy-13β,28-epoxy-oleanan-16-oxo-30-al(1),3β-O-{α-L-rhamnopyranosyl-(1→3)-[(β-D-xylopyranosyl-(1→2)]-β-D-galactopyranosyl-(1→4)-[(β-D-glucopyranosyl-(1→2)]-α-L-ara-binopyranoside}-16α-hydroxy-13,28-epoxy-oleanane(2) and cyclamiretin A 3β-O-α-L-rhamnopyranosyl-(l→3)-[P-D-xylopyranosyl-(1→2)]-β-D-glucopyranosyl-(1→4)-[β-D-glucopyranosyl-(...

关键词： Ardisia gigantifolia Stapf. Myrsinaceae Triterpenoid sapoin