检索结果-南通市图书馆

Chinese Journal of Chemical Engineering 2020年第10期28卷 2549-2554页

作者： qi Zhang Xiaolin Shao Jin Yi Yuyu Liu Jiujun Zhang Institute for Sustainable Energy College of SciencesShanghai UniversityShanghai 200444China

It is well-known that the electrolytes can influence the electrochemical reduction of carbon dioxide(ERCO2)in aqueous *** this work,we explore the effects of alkali metal cations and anions(Li^+,Na^+,K^+,Rb^+,Cs^+,HCO3^-,Cl^-,Br^-,I^-)on the current density and product selectivity for the ERCO2 into formic acid(HCOOH)on the SnO2/carbon paper(Sn O2/C)*** of the ERCO2 experiments show that for the cations,the promotion effects on current density and faradaic efficiencies(FEs)are in the order of Li^+b Na^+b K^+b Cs^+b Rb^+.For the anions,the current density values are in the order of Na HCO3 b NaClb Na Br b Na I and KHCO3 b KCl≈KI b KBr,respectively,and that on the FEs for the formation of the HCOOH(FEHCOOH)is HCO3-b Cl-b Br-b I-.Based on this result,the effects of alkali metal cations and anions on ERCO2 are discussed.

关键词： Carbon dioxide Electroreduction SnO2 electrode Effects Anions Cations

温纳是技术自主论者吗——兼论温纳对埃吕尔的技术自主性思想的发展

在线全文

学校读者我要写书评

暂无评论

自然辩证法研究 2007年第5期23卷 47-50,60页

作者：梅其君贵州大学人文学院哲学系贵阳550025

通过质疑技术控制,提出技术漂流与技术梦游、技术命令、反向适应等概念,温纳事实上阐发了一定的技术自主的思想。温纳的技术自主性思想,特别是技术命令和反向适应这两个概念,是对埃吕尔的技术自主性思想的深化和补充。

关键词：温纳埃吕尔技术自主性

RS-store:RDMA-enabled skiplist-based key-value store for efficient range query

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2021年第6期15卷 133-146页

作者： Chenchen HUANG Huiqi HU Xuecheng qi Xuan ZHOU Aoying ZHOU School of Data Science and Engineering East China Normal UniversityShanghai 200062China

Many key-value stores use RDMA to optimize the messaging and data transmission between application layer and the storage layer,most of which only provide point-wise ***-based store can support both point operations and range queries,but its CPU-intensive access operations combined with the high-speed network will easily lead to the storage layer reaches CPU *** common solution to this problem is offloading some operations into the application layer and using RDMA bypassing CPU to directly perform remote access,but this method is only used in the hash tablebased *** this paper,we present RS-store,a skiplist-based key-value store with RDMA,which can overcome the CPU handle of the storage layer by enabling two access modes:local access and remote *** RS-store,we redesign a novel data structure R-skiplist to save the communication cost in remote access,and implement a latch-free concurrency control mechanism to ensure all the concurrency during two access ***-store also supports client-active range query which can reduce the storage layer’s CPU *** last,we evaluate RS-store on an RDMA-capable *** results show that RS-store achieves up to 2x improvements over RDMA-enabled RocksDB on the throughput and application’s scalability.

关键词： key-value store skiplist RDMA

Spatial pyramidal cross correlation for particle image velocimetry

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2018年第6期61卷 867-878页

作者： WANG HongPing WU Peng GAO qi WANG JianJie WANG Jinjun Key Laboratory of Fluid Mechanics Ministry of Education Beihang University Beoing 100083 China State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Beoing 100190 China Artificial Organ Technology Laboratory Biomanufacturing Centre School of Mechanical and Electrical Engineering Soochow UniversitySuzhou 215006 China

A spatial pyramidal cross-correlation based on interrogation area sub-division is introduced to improve the measurement resolution in particle image velocimetry(PIV). The high-resolution velocity can be achieved with a velocity prediction model via coarse cross-correlation. The prediction formula is deduced from the frequency response of the moving average(MA). The performance of this method was assessed using synthetically generated images of sinusoidal shear flow, two-dimensional vortical cellular flow, and homogeneous turbulence. A real PIV experiment of turbulent boundary layer was used to evaluate the new method. The results indicate that the spatial pyramid cross-correlation can robustly increase the spatial resolution.

关键词： particle image velocimetry (PIV) cross correlation spatial resolution moving average

菌酶复合制剂对湖羊生长性能、血清指标和粪便微生物的影响

在线全文

学校读者我要写书评

暂无评论

农业生物技术学报 2025年第1期33卷 134-145页

作者：祁帅仓振牛伟强李鹏张积鑫茆达干南京农业大学动物科技学院启东瑞鹏牧业有限公司

肉羊(Ovis aries)高度集约化养殖易导致氧化应激，机体抵抗力下降，胃肠菌群紊乱，影响生长性能。饲粮中添加菌酶复合制剂可改善肠道菌群结构，提高营养物质消化率和动物生长性能。为了探究菌酶复合制剂对湖羊生长性能、血清指标和粪便... 详细信息

肉羊(Ovis aries)高度集约化养殖易导致氧化应激，机体抵抗力下降，胃肠菌群紊乱，影响生长性能。饲粮中添加菌酶复合制剂可改善肠道菌群结构，提高营养物质消化率和动物生长性能。为了探究菌酶复合制剂对湖羊生长性能、血清指标和粪便微生物的影响，将48只2月龄的健康湖羊公羔((18.00±2.00) kg)随机分为4组，对照组饲喂基础日粮，实验组1、2、3分别添加0.1%、0.2%、0.3%菌酶复合制剂，预饲期7 d，正式期60 d。结果表明，与对照组相比，在31～60 d和1～60 d实验1和2组平均日增重(average daily gain, ADG)显著提高(P<0.05)，实验各组料重比(feed to gain ratio, F/G)均显著下降(P<0.05)；实验各组的血清白蛋白(albumin, ALB)和葡萄糖(glucose, GLU)含量均显著升高(P<0.05)，实验1组的高密度脂蛋白(high density lipoprotein, HDL)含量显著升高(P<0.05)；实验各组的超氧化物歧化酶(superoxidized dismutase, SOD)、过氧化氢酶(catalase, CAT)和谷胱甘肽过氧化物酶(glutathione peroxidase, GSH-Px)活性均显著升高(P<0.05)；实验各组的免疫球蛋白(immunoglobulin, Ig) IgA和IgG含量显著升高(P<0.05)，实验3组IgM含量显著升高(P<0.05)；实验2组的中性洗涤纤维(neutral detergent fibre, NDF)和酸性洗涤纤维(acid detergent fibre, ADF)表观消化率显著升高(P<0.05)；在门水平上，疣微菌门(Verrucomicrobiota)丰度显著提高(P<0.05)，蓝藻菌门(Cyanobacteria)和弯曲杆菌门(Campylobacterota)丰度显著降低(P<0.05)；在属水平上，另枝菌属(Alistipes)和普雷沃氏菌科UCG-001(Prevotellaceae＿UCG-001)丰度显著提高(P<0.05)，念珠菌＿糖单胞菌属(Candidatus＿Saccharimonas)丰度显著降低(P<0.05)。综上，菌酶复合制剂可提高湖羊生长性能、抗氧化和免疫能力，提高养分表观消化率，促进肠道有益菌的定植，抑制有害菌的定植，以0.2%添加量为最佳。本研究为菌酶复合制剂在湖羊生产中的应用提供科学依据。

关键词：湖羊生长性能菌酶复合制剂粪便微生物

Recent advances and challenges in task-oriented dialog systems

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2020年第10期63卷 2011-2027页

作者： ZHANG Zheng TAKANOBU Ryuichi ZHU qi HUANG MinLie ZHU XiaoYan Department of Computer Science&.Technology Tsinghua UniversityBeijing 100084China Institute for Artificial Intelligence Tsinghua University(THUAI)Beijing 100084China Beijing National Research Center for Information Science&Technology Beijing 100084China

Due to the significance and value in human-computer interaction and natural language processing,task-oriented dialog systems are attracting more and more attention in both academic and industrial *** this paper,we survey recent advances and challenges in task-oriented dialog *** also discuss three critical topics for task-oriented dialog systems:(1)improving data efficiency to facilitate dialog modeling in low-resource settings,(2)modeling multi-turn dynamics for dialog policy learning to achieve better task-completion performance,and(3)integrating domain ontology knowledge into the dialog ***,we review the recent progresses in dialog evaluation and some widely-used *** believe that this survey,though incomplete,can shed a light on future research in task-oriented dialog systems.

关键词： task-oriented dialog systems natural language understanding dialog policy dialog state tracking natural language generation

Non-noble metal single-atom catalysts with phosphotungstic acid(PTA)support:A theoretical study of ethylene epoxidation

在线全文

学校读者我要写书评

暂无评论

Science China Materials 2020年第6期63卷 1003-1014页

作者： Shamraiz Hussain Talib Xiaohu Yu qi Yu Sambath Baskaran jun Li Department of Chemistry and Key Laboratory of Organic Optoelectronics&Molecular Engineering of Ministry of Education Tsinghua UniversityBeijing 100084China Shaanxi Key Laboratory of Catalysis and School of Chemical&Environment Sciences Shaanxi University of TechnologyHanzhong 723000China School of Materials Science and Engineering and Institute of Graphene at Shaanxi Key Laboratory of Catalysis Shaanxi University of TechnologyHanzhong 723001China Department of Chemistry Southern University of Science and TechnologyShenzhen 518055China

Geometric and electronic structures of phosphotungstic acid(PTA)supported single transition metal atom(Fe,Co,Ni,Ru,Rh,Pd,Os,Ir and Pt)catalysts have been systematically investigated by using the first-principles theoretical *** reaction mechanism for ethylene epoxidation was *** most possible anchoring site for the single transition metal atom is the fourfold hollow site on *** the non-noble metal Fe1-PTA system possesses considerable adsorption energies towards both O2 and C2H4,the strong bonding interaction between Fe1 and PTA cluster was *** is found that the electron transfers from Fe atom to PTA cluster and strong covalent metal-support interactions(CMSI)between the Fe 3 d orbitals and O 2 p orbitals of PTA lay the foundation of high *** proposed catalytic reaction mechanism for ethylene epoxidation on Fe1-PTA single-atom catalyst(SAC)includes three steps:the O2 adsorbs on Fe1-PTA via electron transfer;the first ethylene attacks the adsorbed O2 molecule on Fe1-PTA followed by the formation of C2H4O;finally,the O atom remained on Fe1-PTA reacts with a second ethylene to form the product and accomplish the catalytic *** Fe1-PTA has high selectivity and catalytic activity for ethylene epoxidation via an Eley–Rideal mechanism with low energy barriers.A potentially competitive pathway for the formation of acetaldehyde is not kinetically *** results provide insights for the development of highly efficient heterogeneous SACs for ethylene epoxidation with non-noble metals.

关键词： single-atom catalyst non-noble metal phosphotungstic acid ethylene epoxidation computational modeling

MXene-derived quantum dots based photocatalysts:Synthesis,application,prospects,and challenges

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第6期35卷 123-133页

作者： Hao Deng Yuxin Hui Chao Zhang qi Zhou qiang Li Hao Du Derek Hao Guoxiang Yang qi Wang School of Environmental Science and Engineering Zhejiang Gongshang UniversityHangzhou 310018China Instrumental Analysis Center of Zhejiang Gongshang University Hangzhou 310018China Centre for Technology in Water and Wastewater(CTWW) School of Civil and Environmental EngineeringUniversity of Technology Sydney(UTS)UltimoNSW 2007Australia

In recent years,the emerging two-dimensional material-MXenes has attracted widespread attention in the field of photocatalysis due to its high conductivity,suitable Fermi level,tunable elemental composition,and excellent photoelectric *** zero-dimensional quantum dots(MQDs)derived from 2D MXenes not only inherit the characteristics of MXenes but also exhibit better performance due to the quantum size *** on the above excellent physical and chemical properties,MQDs are often used as co-catalysts of photocatalysts,and show excellent co-catalytic *** the same time,compared with other cocatalysts(precious metals,metal oxides,metal sulfides),it has the advantages of low cost and high ***,understanding the status of MQDs in the field of photocatalysis is crucial for their further *** this review,we summarized the synthesis and modification methods of MQDs in recent years,as well as their photocatalytic applications in H_(2) production,CO_(2) reduction,N_(2) fixation,pollutant degradation,and other *** addition,the challenges and prospects faced by MQDs are also proposed,providing theoretical guidance for the further development of MQD-based photocatalysts.

关键词： MXenes Quantum dots Photocatalysis Composites Environment purification

Non-sticky and Non-slippery Biomimetic Patterned Surfaces

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2020年第2期17卷 326-334页

作者： qingwen Dai qi Chang Meng Li Wei Huang Xiaolei Wang National Key Laboratory of Science and Technology on Helicopter Transmission Nanjing University of Aeronautics and AstronauticsNanjing 210016China

In modern mechanical design,non-sticky and non-slippery surfaces are highly preferred in many *** this work,bio-inspired micro patterns of hexagonal pillar and round dimple with various geometric parameters are fabricated,and the static friction and adhesion performances of the prepared surfaces are *** is found that hexagonal pillar patterns can enhance the static friction and weaken the adhesion performances either at dry or wet *** effects of round dimple patterns on the tribological performances depend on the wetting condition,the load,and the area *** function mechanism of the designed surfaces is revealed,and a general design principle of the biomimetic patterned surface is proposed.

关键词： biomimetic static friction adhesion hexagonal pillar round dimple

Structure and performance analysis of fusion positioning system with a single 5G station and a single GNSS satellite

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

Geo-Spatial Information Science 2023年第1期26卷 94-106页

作者： Chi Guo Shufeng qi Wenfei Guo Chenlong Deng Jingnan Liu GNSS Research Center Wuhan UniversityWuhanChina Hubei Luojia Laboratory WuhanChina

NaGlobal vigation Satellite System(GNSS)positioning technology is widely used for its high precision,global,and all-weather ***,in complex environments such as urban canyons,GNSS performance is often degraded due to signal occlusion and even fails to achieve positioning due to the insufficient visible *** of the characteristics of large band-width,low latency,and high Base Station(BS)density,the fifth-Generation mobile communication(5G)technology has gradually become a trend for positioning in cities while offering traditional communication *** supply the communication demands of the User Equipment(UE),only one BS is usually considered to establish a connection with the UE during the BS ***,the positioning accuracy with a single BS in urban canyons will be significantly *** further improve the positioning accuracy in such extreme scenarios,this paper proposes a simplified 5G/GNSS fusion positioning system architecture using observations from only a 5G BS and a GNSS *** this system,the GNSS receiver is mounted on the 5G BS,and the measurements provided by the receiver are used to form the differential code and complete the position *** positioning mathematical models of the system based on the original code and differential code are ***,the impacts of the measurements noise and the time synchronization error on the positioning accuracy are analyzed ***,the positioning performance is investigated by a set of simulation *** results show that under the existing 5G measurement noise and 2 m’s code measurement noise,the improvement of the differential code based fusion positioning compared with the 5G-only positioning is more than 32%,which is also about 6%higher than the original code based fusion ***,this improvement is not affected by the time synchronization error between the BS and the GNSS satellite.

关键词： The fifth-generation mobile communication(5G)positioning 5G/Global navigation satellite system(GNSS)fusion positioning differential code error analysis