检索结果-南通市图书馆

Defence Technology（防务技术） 2023年第4期22卷 74-87页

作者： Yong Kou Yi Wang Jun Zhang Kai-ge Guo xiao-lan song School of Environment and Safety Engineering North University of ChinaTaiyuanShanxi030051China School of Materials Science and Engineering North University of ChinaTaiyuanShanxi030051China School of Ordance Engineering Naval University of EngineeringWuhanHubei430033China School of Chemical Engineering Nanjing University of Science and TechnologyNanjingJiangsu210094China

Aluminum(Al)powder is widely used in solid *** particular,nano-Al has attracted extensive scholarly attention in the field of energetic materials due to its higher reactivity than ***,the existence of aluminum oxide film on its surface reduces the heat release performance of the aluminum powder,which greatly limits its ***,this paper used iron,a component of solid propellant,to coat micron-Al and nano-Al to improve the heat release efficiency and reactivity of Al ***,TEM,EDS,XRD,XPS,and BET were used to investigate the morphological structure and properties of pure Al and Fe/Al composite fuels of different *** results show that Fe was uniformly coated on the surface of Al *** was no reaction between Fe and Al,and Fe/Al composite fuels had a larger specific surface area than pure Al,which could better improve the reactivity of pure ***,the catalytic effects of pure Al and Fe/Al composite fuels of different sizes on ammonium perchlorate and ammonium nitrate were *** results show that the catalysis of pure Al powder could be greatly improved by coating Fe on the surface of Al ***,the micron-Fe/Al composite fuel had a higher catalytic effect than the pure nano-Al ***,Fe/Al composite fuels are expected to be widely used in solid propellants.

关键词： Aluminum Fe/Al composite fuel High reactivity Thermal decomposition AP AN

Grain Growth Kinetics of BaTiO3 Nanocrystals During Calcining Process

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2008年第3期21卷 295-300页

作者： xiao-lan song Xi He Hai-ping Yang Yi-xin Qu Guan-zhou Qiu School of Resources Processing and BioenEineerinE Central South University Changsha 410083China College of Chemical Engineering Beijing University of Chemical Technology Beiging 100029China

BaTiO3 nanocrystals were synthesized by sol-gel method using barium acetate （Ba（CH3COO2） and tetrabutyl titanate （Ti（OC4H9）4） as raw materials. Xerogel precursors and products were characterized by means of thermogravimetric/differential scanning calorimetry （TG/DSC）, X-ray diffraction （XRD） and transmission electron microscope （TEM）. The influence of the calcination temperature and duration on the lattice constant, the lattice distortion, and the grain size of BaTiO3 nanocrystals was discussed based on the XRD results. The grain growth kinetics of BaTiO3 nanocrystals during the calcination process were simulated with a conventional grain growth model which only takes into account diffusion, and an isothermal model proposed by Qu and song, which takes into account both diffusion and surface reactions. Using these models, the pre-exponential factor and the activation energy of the rate constant were estimated. The simulation results indicate that the isothermal model is superior to the conventional one in describing the grain growth process, implying that both diffusion and surface reactions play important roles in the grain growth process.

关键词： BaTiO3 nanocrystal Sol-gel method Grain growth kinetics

Electrochemical conversion of methane to bridge the gap in the artificial carbon cycle

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 2025年第1期100卷 286-308页

作者： Yuhao Peng Yuefeng song Ihar Razanau Juanxiu xiao Wei xiao Di Hu Guoxiong Wang College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power Sources Wuhan University State Key Laboratory of Catalysis Dalian National Laboratory for Clean Energy iChEM (Collaborative Innovation Center of Chemistry for Energy Materials) Dalian Institute of Chemical Physics Chinese Academy of Sciences Laboratory of Physical-Chemical Technologies SSPA Scientific and Practical Materials Research Centre of NAS of Belarus State Key Laboratory of Marine Resources Utilization in South China Sea Collaborative Innovation Center of Marine Science and Technology School of Marine Science and Engineering Hainan University Department of Chemical and Environmental Engineering University of Nottingham Ningbo China

Methane, an abundant one-carbon（C1） resource, is extensively used in the industrial production of vital fuels and value-added chemicals. However, current industrial methane conversion technologies are energy-and carbon-intensive, mainly due to the high activation energy required to break the inert C–H bond, low selectivity, and problematic side reactions, including CO2emissions and coke deposition. Electrochemical conversion of methane（ECM） using intermittent renewable energy offers an attractive solution, due to its modular reactor design and operational flexibility across a broad spectrum of temperatures and pressures. This review emphasizes conversion pathways of methane in various reaction systems, highlighting the significance and advantages of ECM in facilitating a sustainable artificial carbon cycle. This work provides a comprehensive overview of conventional methane activation mechanisms and delineates the complete pathways of methane conversion in electrolysis contexts. Based on surface/interface chemistry, this work systematically analyzes proposed reaction pathways and corresponding strategies to enhance ECM efficiency towards various target products, including syngas, hydrocarbons, oxygenates, and advanced carbon materials. The discussion also encompasses opportunities and challenges for the ECM process, including insights into ECM pathways, rational electrocatalyst design, establishment of benchmarking protocols, electrolyte engineering, enhancement of CH4conversion rates, and minimization of CO2emission.

关键词： Methane Electrochemical conversion Reaction mechanism Catalyst design Electrode Electrocatalysis

Depositing of Amorphous Ferri-oxide Nanoparticles on Surfaces of Submicron Aluminum Powder

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Depositing of Amorphous Ferri-oxide Nanoparticles on Surface...

2012 China Functional Materials Technology and Industry Forum

作者： Yi Wang Wei Jiang xiao lan song Guo Dong Deng Feng Sheng Li National Special Superfine Powder Engineering Research Center Nanjing University of Science and Technology School of Materials Science and Engineering North University of China School of Chemical Engineering and Environment North University of China

Nanoparticles with about 20nm diameter were densely coated on the surface of submicron Al via a sol-gel processing in ethanol,wherein 1,2-epoxypropane acted as a weak base to consume proton in *** the medium gelled,uniform network formed and aluminum particles imbedded in *** core-shell structure and the nanoparticles were observed in SEM *** EDS spectrum and the XRD pattern revealed that the cores consisted of amorphous ferri-oxide of which the mass ratio is closed to that of crystal *** analysis was performed and the results indicated that the DSC peak point of ferri-oxide/Al nanocomposite showed 53℃lower than that of[ferri-oxide+Al]simple mixture.

关键词： Nanocomposite Sol-gel Ferric oxide Aluminum powder Thermite reaction

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

碳纳米管技术在食品安全检测中的应用进展

食品科学 2014年第21期35卷 344-349页

作者：兰小淞吕延成遵义医学院珠海校区广东珠海519041

随着国家和人民对食品安全越来越重视,各种食品安全检测理论和方法不断涌现,以满足不同场合需求,同时往往伴随着特殊材料和新技术的运用。碳纳米管(carbon nanotubes,CNT)的运用出现在多学科领域,展现了其优良特性和运用前景,其在食品... 详细信息

随着国家和人民对食品安全越来越重视,各种食品安全检测理论和方法不断涌现,以满足不同场合需求,同时往往伴随着特殊材料和新技术的运用。碳纳米管(carbon nanotubes,CNT)的运用出现在多学科领域,展现了其优良特性和运用前景,其在食品安全检测中的运用可分为两大类:一类是将碳纳米管整合于传统食品安全检测技术中;另一类是开发基于碳纳米管的生物传感器。碳纳米管在食品安全检测领域的应用使得检测方法和技术自动化、微型化,具有灵敏度高、稳定性好、生产成本低、寿命长、效率高、快速等特点。

关键词：食品安全检测碳纳米管生物传感器

Tuning the interfacial reaction environment via pH-dependent and induced ions to understand C–N bonds coupling performance in NO3- integrated CO2 reduction to carbon and nitrogen compounds over dual Cu-based N-doped carbon catalyst

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 273-285页

作者： Tianhang Zhou Chen Shen Zhenghao Wu Xingying lan Yi xiao College of Carbon Neutrality Future Technology State Key Laboratory of Heavy Oil Processing China University of Petroleum (Beijing) Institute of Materials Science TU Darmstadt Department of Chemistry Xi'an Jiaotong-Liverpool University Department of Mechanical and Mechatronics Engineering and Waterloo Institute of Nanotechnology University of Waterloo Waterloo

Dual atomic catalysts （DAC）,particularly copper （Cu2）-based nitrogen （N） doped graphene,show great potential to effectively convert CO2and nitrate （NO3-） into important industrial chemicals such as ethylene,glycol,acetamide,and urea through an efficient catalytical process that involves C–C and C–N ***,the origin of the coupling activity remained unclear,which substantially hinders the rational design of Cu-based catalysts for the N-integrated CO2reduction reaction （CO2RR）.To address this challenge,this work performed advanced density functional theory calculations incorporating explicit solvation based on a Cu2-based N-doped carbon (Cu2N6C10) catalyst for *** calculations are aimed to gain insight into the reaction mechanisms for the synthesis of ethylene,acetamide,and urea via coupling in the interfacial reaction *** to the sluggishness of CO2,the formation of a solvation electric layer by anions （F-,Cl-,Br-,and I-） and cations (Na+,Mg2+,K+,and Ca2+) leads to electron transfer towards the Cu *** process significantly accelerates the reduction of *** results reveal that*CO intermediates play a pivotal role in N-integrated ***,the Cu2-based N-doped carbon catalyst examined in this study has demonstrated the most potential for C–N coupling to *** findings reveal that through the process of a condensation reaction between*CO and NH2OH for urea synthesis,*NO3-is reduced to*NH3,and*CO2to*CCO at dual Cu atom *** dual-site reduction facilitates the synthesis of acetamide through a nucleophilic reaction between NH3and the ketene ***,we found that the I-and Mg2+ions,influenced by pH,were highly effective for acetamide and ammonia synthesis,except when F-and Ca2+were ***,the mechanisms of C–N bond formation were investigated via ab-initio molecular dynamics simulations,and we found that adjusting the micro-environment can change the dominant side reaction,shift

关键词： pH-dependent micro-environments C–N coupling Dual Cu-based nitrogen carbon catalysts Explicit solvation model Ion stabilizer AIMD

Mechanism for thermite reactions of aluminum/iron-oxide nanocomposites based on residue analysis

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2014年第1期24卷 263-270页

作者：王毅宋小兰姜炜邓国栋郭效德刘宏英李凤生南京理工大学国家特种超细粉体工程技术研究中心南京210094 中北大学材料科学与工程学院太原030051 中北大学化工与环境学院太原030051

Sol-gel method was employed to combine Al and iron-oxide to form nanocomposites （nano-Al/xero-Fe2O3 and micro-Al/xero-Fe2O3）. SEM, EDS and XRD analyses were used to characterize the nanocomposites and the results indicated that nano-Al and micro-Al were compactly wrapped by amorphous iron-oxide nanoparticles （about 20 nm）, respectively. The iron-oxide showed the mass ratio of Fe to O as similar as that in Fe2O3. Thermal analyses were performed on two nanocomposites, and four simple mixtures （nano-Al＋xero-Fe2O3, nano-Al＋micro-Fe2O3, micro-Al＋xero-Fe2O3, and micro-Al＋micro-Fe2O3） were also analyzed. There were not apparent distinctions in the reactions of thermites fueled by nano-Al. For thermites fueled by micro-Al, the DSC peak temperatures of micro-Al/Xero-Fe2O3 were advanced by 68.1 ℃ and 76.8 ℃ compared with micro-Al＋xero-Fe2O3 and micro-Al＋micro-Fe2O3, respectively. Four thermites, namely, nano-Al/xero-Fe2O3, nano-Al＋micro-Fe2O3, micro-Al/xero-Fe2O3, and micro-Al＋micro-Fe2O3, were heated from ambient temperature to 1020 ℃, during which the products at 660 ℃ and 1020 ℃ were collected and analyzed by XRD. Crystals of Fe, FeAl2O4, Fe3O4,α-Fe2O3, Al,γ-Fe2O3, Al2.667O4, FeO andα-Al2O3 were indexed in XRD patterns. For each thermite, according to the specific products, the possible equations were given. Based on the principle of the minimum free energy, the most reasonable equations were inferred from the possible reactions.

关键词： Al Al nanocomposites thermite reaction reaction mechanism

Synergistically enhanced ORR and HER performance on Co-N-C coupled in-situ generated PtCo intermetallic

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 721-729页

作者： Guanyu Luo Min song Lulu An xiao Huang Qian Zhang Chenhao Zhang Tao Shen Shuang Wang Deli Wang Key Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology) Ministry of Education School of Chemistry and Chemical Engineering Huazhong University of Science and Technology

Integrating multi-scale sites in a composite catalyst is vital to realize efficient ***,a synergistic composite catalyst consisting of Co atomic sites and in-situ generated PtCo intermetallic compounds （IMCs）(o-PtCo@CoNC) is proposed through Co pre-anchoring and subsequent impregnation-reduction *** loading of Co atoms provides a chance for in-situ generating PtCo ordered intermetallic *** remaining Co single atoms and PtCo IMCs construct synergistic electrocatalytic *** from the ordered structure,synergistic effect of Pt Co IMCs and Co single atoms,o-PtCo@CoNC exhibits excellent electrocatalytic performance for oxygen reduction reaction （ORR） and hydrogen evolution reaction （HER） with mass activity of 1.21 A mgPt-1（at 0.9 V） and5.70 A mgPt-1（at an overpotential of 100 mV）,***,o-PtCo@CoNC delivers negligible loss of half-wave potential and overpotential during long-term stability test in acid solutions,with 13 mV decay after 50,000 potential cycles for ORR and a 2.7 mV decay after 20,000 potential cycles for *** integration strategy of single-atomic sites coupled IMCs paves the way for enhancing the activity and durability of Pt-based electrocatalysts.

关键词： Electrolytic reduction

Laparoscopic liver resection utilizing the ventral avascular area of the inferior vena cava:A retrospective cohort study

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2025年第1期31卷 42-57页

作者： Kun Huang Zhu Chen Heng xiao Hai-Yang Hu Xing-Yu Chen Cheng-You Du Xiang lan Department of Hepatobiliary Surgery The First Affiliated Hospital of Chongqing Medical UniversityChongqing 400000China Department of General Surgery Mianyang Hospital of Traditional Chinese MedicineMianyang 621000Sichuan ProvinceChina

BACKGROUND Laparoscopic liver resection(LLR)can be challenging due to the difficulty of establishing a retrohepatic tunnel under *** the third hepatic hilum before parenchymal transection often leads to significant liver mobilization,tumor compression,and bleeding from the short hepatic veins(SHVs).This study introduces a novel technique utilizing the ventral avascular area of the inferior vena cava(IVC),allowing SHVs to be addressed after parenchymal transection,thereby reducing surgical complexity and improving outcomes in in situ *** To introduce and evaluate a novel LLR technique using the ventral avascular area of the IVC and compare its short-term outcomes with conventional *** The clinical cohort data of patients with pathologically confirmed hepatocellular carcinoma or intrahepatic cholangiocarcinoma who underwent conventional LLR and novel LLR between July 2021 and July 2023 at the First Affiliated Hospital of Chongqing Medical University were retrospectively *** novel LLR,we initially separated the caudate lobe from the IVC using dissecting forceps along the ventral avascular area of the ***,we transected the parenchyma of the left and right caudate lobes from the caudal side to the cephalic side using the avascular area as a ***,we addressed the SHVs and finally dissected the root of the right hepatic vein or left hepatic *** short-term postoperative outcomes and oncological results of the two approaches were evaluated and *** A total of 256 patients were included,with 150(58.59%)undergoing conventional LLR and 106(41.41%)undergoing novel *** novel technique resulted in significantly larger tumor resections(6.47±2.96 cm vs 4.01±2.33 cm,P<0.001),shorter operative times(199.57±60.37 minutes vs 262.33±83.90 minutes,P<0.001),less intraoperative blood loss(206.92±37.09 mL vs 363.34±131.27 mL,P<0.001),and greater resection volume(345.11±31.40 mL vs 264.38±31.98 mL,P<0.001)comp

关键词： Laparoscopic liver resection Inferior vena cava Retrohepatic tunnel Short hepatic veins Complex liver tumors Intraoperative bleeding control

Passive activity enhances residual control ability in patients with complete spinal cord injury

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

Neural Regeneration Research 2025年第8期20卷 2337-2347页

作者： Yanqing xiao Mingming Gao Zejia He Jia Zheng Hongming Bai Jia-Sheng Rao Guiyun song Wei song xiaoguang Li Beijing Key Laboratory for Biomaterials and Neural Regeneration Beijing Advanced Innovation Center for Biomedical EngineeringSchool of Biological Science and Medical EngineeringBeihang UniversityBeijingChina Department of Rehabilitation Evaluation China Rehabilitation Research CenterBeijingChina Cardiac Center Beijing Children’s HospitalCapital Medical UniversityBeijingChina The State Key Laboratory of Virtual Reality Technology and Systems Beihang UniversityBeijingChina Department of Rehabilitation Engineering China Rehabilitation Science InstituteBeijingChina

Patients with complete spinal cord injury retain the potential for volitional muscle activity in muscles located below the spinal injury ***,because of prolonged inactivity,initial attempts to activate these muscles may not effectively engage any of the remaining neurons in the descending pathway.A previous study unexpectedly found that a brief clinical round of passive activity significantly increased volitional muscle activation,as measured by surface *** this study,we further explored the effect of passive activity on surface electromyographic signals during volitional control tasks among individuals with complete spinal cord *** patients with chronic complete thoracic spinal cord injury were *** electromyography data from eight major leg muscles were acquired and compared before and after the passive activity *** results indicated that the passive activity led to an increased number of activated volitional muscles and an increased frequency of *** the cumulative root mean square of surface electromyography amplitude for volitional control of movement showed a slight increase after passive activity,the difference was not statistically *** findings suggest that brief passive activity may enhance the ability to initiate volitional muscle activity during surface electromyography tasks and underscore the potential of passive activity for improving residual motor control among patients with motor complete spinal cord injury.

关键词： complete spinal cord injury cycle training epidural electrical stimulation motor training passive activity physiological state spinal cord circuit surface electromyography volitional control task