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

Smile

中国翻译 1995年第2期 65-66页

作者： Bing xin Translated by zhang Peiji

As the rain gradually ceased to patter, aglimmer of light began to filter into the roomthrough the window curtain. I opened thewindow and looked out. An, the rain cloudshad vanished and the remaining raindrops onthe tree leaves glistened tremulously underthe moonlight like myriads of fireflies. Tothink that there should appear before myeyes such a beautiful sight after the

关键词：散文英语冰心早期小说月报自然美女作家惯用句型语气表达超现实

Numerical analysis on phase change progress and thermal performance of different roofs integrated with phase change material(PCM)in Moroccan semi-arid and Mediterranean climates

在线全文

学校读者我要写书评

暂无评论

Building Simulation 2023年第1期16卷 69-85页

作者： Yanqiu Huang Shan Yang Moussa Aadmi yi Wang Mustapha Karkri Zhenhao zhang State Key Laboratory of Green Building in Western China Xi'an University of Architecture and TechnologyNo.13 Yanta RD.Xi'an 710055China School of Building Services Science and Engineering Xi'an University of Architecture and TechnologyNo.13 Yanta RD.Xi'an 710055China LMASI ElectromagnetismPhysics of Plasmas and ApplicationsPolydisciplinary Faculty of NadorMohammed First UniversityB.P 30062700SelouaneNadorMorocco CERTES Univ Paris Est Creteil61 Avenue du Général de GaulleF-94010 CreteilFrance

Phase change material(PCM)applied to roofs can weak external heat entering the room to reduce air-conditioning energy *** this study,three forms of macro-encapsulated PCM roofs with different PCMs(RT27,RT31,RT35HC,PT37)are *** effects of PCM thickness,the encapsulation forms,and different PCMs on the thermal performance of the roof are discussed in Moroccan semi-arid and Mediterranean *** results show that as the PCM thickness increases,the peak temperature attenuation of the roof inner surface *** two climates,the pure PCM layer among the three encapsulation forms(*** PCM layer,PCM in aluminum tubes,PCM in triangular aluminum)is the easiest to appear the phenomenon of insufficient heat storage and release,while the reduction of the peak inner surface temperature and time lag is the most *** the PCM in the aluminum tube,phase change time is the shortest and the latent heat utilization ratio is the highest,while thermal regulation performance is the least *** PCM in triangular aluminum can improve the latent heat utilization ratio significantly,and its thermal regulation performance is in the *** semi-arid climate,the time lag increases with phase change temperature *** time lag could reach up to 6 h with 37℃phase transition *** Mediterranean climate,the longest time lag with RT31 is 5 h,while the lowest peak inner surface temperature appears with *** obtained conclusions could provide guidance for the application of PCM roofs in these two climates.

关键词： numerical simulation PCM roof thermal performance inner surface temperature time lag

Synthesis of Enriched 10B Boric Acid of Nuclear Grade

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

Transactions of Tianjin University 2014年第6期20卷 458-462页

作者： zhang Lei School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China Chemical Engineering Research Center Tianjin UniversityTianjin 300072China

An economic and effective method of preparing enriched 10B boric acid was established by chemical reactionof enriched 10BF3 and CaCO3. A process of boron trifluoride reacting with water was investigated under certainconditions. Calcium carbonate was selected to counteract hydrofluoric acid followed on. Some key operation factorswere investigated, such as temperature, reaction time and the ratio of CaCO3 to 10BF3. The results showed that the yieldof enriched 10B boric acid could reach 97. 2% and the purity was up to 94. 1% under the following conditions： the temperaturewas 50-60,℃, the reaction time was 28 h and the ratio of CaCO3 to 10BF3 was 4. In addition, after recrystallizationand titration analysis, the purity of the product could reach over 99. 2% from 94.1%.

关键词： enriched 10B boric acid boron trifluoride calcium carbonate fluoboric acid hydrogen fluoride

Evolution of tribo-magnetization during sliding of ferromagnetic materials

在线全文

学校读者我要写书评

暂无评论

Friction 2024年第5期12卷 906-918页

作者： Fumin GAO Laibin zhang Jin ZHOU yi XIONG Jing WU Jianchun FAN China University of Petroleum-Beijing Beijing102249China Key Laboratory of Oil and Gas Safety and Emergency Technology Ministry of Emergency ManagementBeijing102249China

Sliding-induced subsurface microstructure evolution is believed to be decisive for determining the friction and wear performance of metallic contacts as well as the development of *** expects to develop a new prediction method of wear state by elucidating the correlation between subsurface microstructure evolution and corresponding magnetic domain ***,subsurface microstructure evolution including crystal and magnetic domain under tribological action is investigated *** results demonstrate that dislocation mediated plastic deformation decisively influences microstructural changes during tribological contact,further determining the magnetic domain ***,sliding-induced plastic deformation causes an increase in the width of magnetic domains,but depth-dependent derived microstructure formed under severe plastic deformation such as the refined grains and sub-grains,in turn,promoted the refinement of magnetic domains and their discontinuity,forming depth-dependent magnetic domain *** results are helpful to clarify the evolution of tribo-magnetization and the pinning effect of dislocations on magnetic domains.

关键词： tribology magnetic domain microstructure tribo-magnetization dislocations

Quantification of Central and Eastern China's atmospheric CH_(4) enhancement changes and its contributions based on machine learning approach

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

Journal of Environmental Sciences 2024年第4期138卷 236-248页

作者： xinyue Ai Cheng Hu Yanrong Yang Leying zhang Huili Liu Junqing zhang xin Chen Guoqiang Bai Wei Xiao College of Biology and the Environment Joint Center for sustainable Forestry in Southern ChinaNanjing Forestry UniversityNanjing 210037China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD) Nanjing University of Information Science&TechnologyNanjing 210044China Guang’an Vocational&Technical College Guangan 638550China HuaNan Meteorological Administration Huanan 154400China

Methane is the second largest anthropogenic greenhouse gas,and changes in atmospheric methane concentrations can reflect the dynamic balance between its emissions and ***,the monitoring of CH_(4) concentration changes and the assessment of underlying driving factors can provide scientific basis for the government’s policy making and *** is the world’s largest emitter of anthropogenic ***,due to the lack of ground-based observation sites,little work has been done on the spatial-temporal variations for the past decades and influencing factors in China,especially for areas with high anthropogenic emissions as Central and Eastern *** to quantify atmospheric CH_(4) enhancements trends and its driving factors in Central and Eastern China,we combined the most up-to-date TROPOMI satellite-based column CH_(4)(xCH_(4))concentration from 2018 to 2022,anthropogenic and natural emissions,and a random forest-based machine learning approach,to simulate atmospheric xCH_(4) enhancements from 2001 to *** results showed that(1)the random forest model was able to accurately establish the relationship between emission sources and xCH_(4) enhancement with a correlation coefficient(R^(2))of 0.89 and a root mean-square error(RMSE)of 11.98 ppb;(2)The xCH_(4) enhancement only increased from 48.21±2.02 ppb to 49.79±1.87 ppb from the year of 2001 to 2018,with a relative change of 3.27%±0.13%;(3)The simulation results showed that the energy activities and waste treatment were the main contributors to the increase in xCH_(4) enhancement,contributing 68.00% and 31.21%,respectively,and the decrease of animal ruminants contributed-6.70% of its enhancement trend.

关键词： TROPOMI Methane column concentrations Anthropogenic sources Random Forest model

Formation kinetics of polyoxymethylene dimethyl ethers from methylal and trioxane with little water

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2021年第5期34卷 139-146页

作者： Xiaofei Qin Sen Lei Xubin zhang Chen Cao Feng xin Honglin Chen Xiaoming zhang Yachen yin Guilian Wu School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China Chengdu Institute of Organic Chemistry Chinese Academy of SciencesChengdu 610041China

Polyoxymethylene dimethyl ethers(CH_(3)-O-(CH_(2)O)_(n)-CH_(3),PODE_(n),n>1)can be added to diesel to reduce air pollution caused by incomplete *** by this need,a cost-effective and efficient synthetic route is presented and investigated by this work for the production of PODE_(n),which are formed from methylal and trioxane with low water content(<10%(mass))over HZSM-5 catalyst in a batch slurry autoclave at the temperature from 353.15 K to 393.15 *** reaction rate laws including the PODE_(n) and byproducts of polyoxymethylene hemiformals(HF_(n)),polyoxymethylene glycols(MG),methanol(MeOH)and methyl formate(MF)are *** rate constants of propagation step(k_(6))and depolymerization step(k_(-6))are assumed independent on polymerization degree of PODE_(n).The rate of reaction is proportional to the content of the catalyst(Wcat)for the catalytic reaction within the scope of the *** kinetic parameters were estimated by combining genetic algorithm and least square regression to fit experimental data *** work is valuable for process optimization and reactor design.

关键词： Fuel additive Polyoxymethylene dimethyl ethers Kinetics HZSM-5

Electronic tattoos based on large-area Mo2C grown by chemical vapor deposition for electrophysiology

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第3期16卷 4100-4106页

作者： Shiyu Wang xin Wang Weifeng zhang Xiaohu Shi Dekui Song Yan zhang Yan Zhao Zihan Zhao Nan Liu Beijing Graphene Institute Beijing 100094China Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing 100875China

Tattoo electronics has attracted intensive interest in recent years due to its comfortable wearing and imperceivable sensing,and has been broadly applied in wearable healthcare and human-machine ***,the tattoo electrodes are mostly composed of metal films and conductive ***-dimensional(2D)materials,which are superior in conductivity and stability,are barely studied for electronic ***,we reported a novel electronic tattoo based on large-area Mo_(2)C film grown by chemical vapor deposition(CVD),and applied it to accurately and imperceivably acquire on-body electrophysiological signals and interface with ***-quality Mo_(2)C film was obtained via optimizing the distribution of gas flow during CVD *** to the finite element simulation(FES),bottom surface of Cu foil covers more stable gas flow than the top surface,thus leading to more uniform Mo_(2)C *** resulting Mo_(2)C film was transferred onto tattoo paper,showing a total thickness of~3μm,sheet resistance of 60-150Ω/sq,and skin-electrode impedance of~5×10^(5)Ω.Such thin Mo_(2)C electronic tattoo(MCET in short)can form conformal contact with skin and accurately record electrophysiological signals,including electromyography(EMG),electrocardiogram(ECG),and electrooculogram(EOG).These body signals collected by MCET can not only reflect the health status but also be transformed to control the robotics for human-machine interface.

关键词： electronic tattoo Mo2C film gas flow chemical vapor deposition electrophysiological signals

Construction of Ru/WO3 with hetero-interface structure for efficient hydrogen evolution reaction

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

Journal of Energy Chemistry 2023年第8期83卷 150-157,I0006页

作者： xin Xie Yunxiao Fan Wanyu Tian Meng zhang Jialin Cai xingang zhang Jie Ding Yushan Liu Siyu Lu Green Catalysis Center College of ChemistryZhengzhou UniversityZhengzhou 450001HenanChina College of Material Henan Key Laboratory of Aeronautical Materials and Application TechnologyZhengzhou University of AeronauticsZhengzhou 4500oHenanChina

Water electrolysis is considered as one most promising technique for hydrogen *** high efficiency electrocatalyst is the key to accelerating the sluggish kinetics of the hydrogen evolution reaction(HER) in alkaline *** this work,an efficient HER electrocatalyst with hetero-interfacial metal-metal oxide structure was constructed through a redox solid phase reaction(SPR) *** the annealing process under Ar atmosphere,RuO_(2) and WS_(2)in RuO_(2)/WS_(2)precursor were converted to Ru nanoparticles(NPs) and WO3in situ,where tiny Ru NPs and oxygen vacancies were uniformly distributed onto the newly formed *** characterization techniques were adopted to confirm the successful formation of Ru/WO_(3)electrocatalyst(RWOC).The optimized RWOC sample annealed at 400℃ exhibited the low overpotential value of 13 mV at a current density of 10 mA cm^(-2)and strong durability under the alkaline *** functional theoretical calculations further revealed that the promoted adsorption/desorption rate of reaction intermediates and the accelerated kinetics of HER process were deduced to the synergistic effect between Ru and WO_(3)in *** work provides a feasible method to fabricate highly efficient HER electrocatalysts.

关键词： Ru WO_(3) Hetero-interface Hydrogen evolution reaction Electrocatalyst

A novel gene R049 identified in uropathogenic Escherichia coli provides partial protection in mice from colonization

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2011年第8期56卷 755-761页

作者： CHEN Jinying GE xin zhang YuMei LIN Xu zhang Wei YANG Xi Department of Medical Microbiology Tianjin Medical University Tianjin 300070 China Research Center of Molecular Medicine Fujian Medical University Fuzhou 350004 China Department of Medical Microbiology Faculty of Medicine University of Manitoba Winnipeg Manitoba R3E OW3 Canada

Uropathogenic Escherichia coli(UPEC) is the most common causative organism of human urinary tract infection(UTI).Several UPEC virulence factors have been identified,but more are yet to be *** previously identified a novel 789-bp-long DNA fragment(named R049) in UPEC strain 132 using a suppressive subtractive hybridization *** the present study,we used genome walking to elongate the sequence of this fragment to obtain the whole gene sequence and examined the role of this gene product in generating protective *** bioinformatic analysis,we predicted that this gene is a 1311-bp open reading frame(ORF),which we designated ORFR049(GenBank accession No.:EF488001).We further constructed a prokaryotic expression system to express full recombinant R049 protein and isolated and purified the protein through IPTG induction and nickel affinity *** mouse immunosera generated by the purified protein,we confirmed the natural expression and outer membrane localization of the protein in wild-type strain UPEC132 by Western *** test the potential of this protein as a vaccine candidate,we immunized mice with the recombinant protein before challenging them with UPEC132 through the urinary *** results showed significantly reduced bacterial colonization in the urine and kidneys of the immunization group compared with the control ***,the degree of renal pathological damage was not significantly improved in the immunized *** study has identified a novel gene of UPEC which can generate protective immunity against *** novel gene provides a promising new vaccine candidate.

关键词：保护性免疫免疫小鼠大肠杆菌基因组肾炎定植抑制消减杂交技术 GenBank