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Phase evolution process and hydrogen storage performances of V72.i18Cr10 alloy prepared by Co-precipitation-reduction method

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Progress in Natural Science:Materials International 2022年第4期32卷 407-414页

作者： Yaobin Han Chaoling Wu Qian Wang Derui Sun wenyu Cheng Xiangyang Li Yuchi zhang Xingzhong Cao Yigang Yan Yao Wang Yungui Chen College of Materials Science and Engineering Sichuan University Engineering research Center of Alternative Energy Materials & Devices Ministry of Education Multi-discipline research Division Institute of High Energy Physics Chinese Academy of Sciences institute of New Energy and Low-Carbon Technology Sichuan University

The V72.i18Cr10alloy was prepared by a co-precipitation-reduction method in order to consume less energy during whole-life alloy manufacturing, and the phase evolution process in hydrogenation/dehydrogenation process was investigated. The structure refinement analysis of the alloy contented with 1 wt% hydrogen after hydrogenation shows that BCC phase, BCC-hydride phase and FCC phase coexisted, but little BCT phase was found. It indicates that the phase evolution process during hydrogenation was BCC→ BCC-hydride→ FCC,nevertheless the formation of BCT phase was restrained. The limited particle sizes of the alloy in the range of 0.1–5 μm and fewer defects than the normal alloy ingot contributed to the suppression of BCT formation. The annealed alloy, which had similar particle sizes with the unannealed alloy, has less unevenness of the compositions than the unannealed alloy, and the annealed alloy showed flatter plateau in the hydrogenation PCT(pressure-composition-temperature) curves. However, the BCT phase in the annealed alloy appeared in its dehydrogenation process owing to the produced defects during the following dehydrogenation and the hydrogenation process. The alloy with the limited particle sizes even in the range from 0.1 μm to 5 μm could not prevent the generation of BCT phase in the dehydrogenation process.

关键词： V-Ti-Cr alloy Co-precipitation-reduction Phase evolution process Hydrogen storage performance

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Regulating local chemical environment in O_(3)-type layered sodium oxides by dual-site Mg^(2.)/B^(3+)substitution achieves durable and high-rate cathode

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Chinese Chemical Letters 2024年第9期35卷 469-474页

作者： Guangchang Yang Shenglong Yang Jinlian Yu Yishun Xie Chunlei Tan Feiyan Lai Qianqian Jin Hongqiang Wang Xiaohui zhang Guangxi Key Laboratory of Low Carbon Energy Materials Guangxi New Energy Ship Battery Engineering Technology Research CenterGuangxi Scientific and Technological Achievements Transformation Pilot Research Base of Electrochemical Energy Materials and DevicesSchool of Chemistry and Pharmaceutical SciencesGuangxi Normal UniversityGuilin 541004China College of Materials and Chemical Engineering Guangxi Key Laboratory of Calcium Carbonate Resources Comprehensive UtilizationHezhou UniversityHezhou 542899China School of Civil Engineering and Architecture Center for the Structure of Advanced MatterSchool of Electronic EngineeringGuangxi University of Science and TechnologyInstitute of New Building Materials and Engineering ApplicationsLiuzhou 545006China

The O_(3)-Na_(0.85)Ni_(0.2.Fe_(0.4)Mn_(0.4)O_(2.layered oxide cathode material possesses the advantages of high specific capacity,low cost,and simple ***,sluggish kinetics and complicated phase transition caused by the large size difference between Na+and tetrahedral gaps lead to poor rate and cycling ***,a scalable and feasible strategy was proposed to modulate local chemical environment by introducing Mg^(2.)and B^(3+)into O_(3)-Na_(0.85)Ni_(0.2.Fe_(0.4)Mn0.4O_(2.,which can distinctly improve kinetic transport rate as well as electrochemical *** capacity retention of O_(3)-(Na_(0.82.Mg_(0.04))(Ni_(0.2.Fe_(0.4)Mn_(0.4))B_(0.02.O_(2.(NFMB)increases from 43.3%and 12.4%to 89.5%and 89.0%at 1 C and 3 C after 2.0 cycles,***,the electrode still delivers high rate capacity of 93.9 mAh/g when current density increases to 10 ***^(2.)ions riveted on Na layer act as a“pillar”to stabilize crystal structure and inhibit structural change during the desodiumization process.B^(3+)ions entering tetrahedral interstice of the TM layer strengthen the TM-O bond,lower Na+diffusion energy barrier and inhibits the slip of TM ***,the assembled full batteries with the modified cathode material deliver a high energy density of 2.8.2.h/kg with commercial hard carbon as *** work provides a strategy for the modification of high-performance SIB layered oxide materials to develop the next-generation cost-effective energy storage grid systems.

关键词： Sodium-ion batteries Layered cathode material DFT calculation Local chemistry environment Magnesium/boron co-substitution

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Assessing canopy nitrogen and carbon content in maize by canopy spectral reflectance and uninformative variable elimination

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The Crop Journal 2022年第5期10卷 1224-1238页

作者： Zhonglin Wang Junxu Chen Jiawei zhang Xianming Tan Muhammad Ali Raza Jun Ma Yan Zhu Feng Yang wenyu Yang College of Agronomy Sichuan Agricultural UniversityChengdu 611130SichuanChina Sichuan Engineering research Center for Crop Strip Intercropping System Chengdu 611130SichuanChina Rice research institute Sichuan Agricultural UniversityChengdu 611130SichuanChina National Engineering and Technology Center for Information Agriculture Nanjing Agricultural UniversityNanjing 210095JiangsuChina

Assessing canopy nitrogen content(CNC) and canopy carbon content(CCC) of maize by hyperspectral remote sensing data permits estimating cropland productivity, protecting farmland ecology, and investigating the nitrogen and carbon cycles in the atmosphere. This study aimed to assess maize CNC and CCC using canopy hyperspectral information and uninformative variable elimination(UVE). Vegetation indices(VIs) and wavelet functions were adopted for estimating CNC and CCC under varying water and nitrogen regimes. Linear, nonlinear, and partial least squares(PLS) regression models were fitted to VIs and wavelet functions to estimate CNC and CCC, and were evaluated for their prediction *** was used to eliminate uninformative variables, improve the prediction accuracy of the models, and simplify the PLS regression models(UVE-PLS). For estimating CNC and CCC, the normalized difference vegetation index(NDVI, based on red edge and NIR wavebands) yielded the highest correlation coefficients(r > 0.88). PLS regression models showed the lowest root mean square error(RMSE) among all models. However, PLS regression models required nine VIs and four wavelet functions, increasing their complexity. UVE was used to retain valid spectral parameters and optimize the PLS regression ***-PLS regression models improved validation accuracy and resulted in more accurate CNC and CCC than the PLS regression models. Thus, canopy spectral reflectance integrated with UVE-PLS can accurately reflect maize leaf nitrogen and carbon status.

关键词： Canopy nitrogen content Canopy carbon content Maize Canopy spectral reflectance Uninformative variable elimination

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芽孢杆菌hjt6的鉴定、生长特性及其对瓠瓜灰霉病菌的拮抗效果

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微生物学通报 2024年第3期51卷 832-845页

作者：胡江涛刘奇周英宋倩何小露郭崇炎邹志华梅文宇熊春晖张静燕赣州市蔬菜花卉研究所江西赣州341413 赣南科学院江西赣州341000 赣州市职业技术学院江西赣州341000

【背景】由极细枝孢(Cladosporium tenuissimum)引起的灰霉病是设施瓠瓜上非常普遍的一种真菌性病害,常常造成巨大经济损失。【目的】对瓠瓜灰霉病菌具有明显拮抗活性的菌株hjt6进行鉴定、生长特性和抑菌活性评价,为瓠瓜灰霉病的生物防... 详细信息

【背景】由极细枝孢(Cladosporium tenuissimum)引起的灰霉病是设施瓠瓜上非常普遍的一种真菌性病害,常常造成巨大经济损失。【目的】对瓠瓜灰霉病菌具有明显拮抗活性的菌株hjt6进行鉴定、生长特性和抑菌活性评价,为瓠瓜灰霉病的生物防治提供菌种资源。【方法】通过形态学、生理生化测定、16S rRNA基因序列和gyrB基因测序分析对菌株hjt6进行鉴定;通过生长曲线、温度、pH和耐盐度等测定菌株hjt6的生长特性;采用菌丝抑制法测定该菌株的广谱抗性效果;通过平板拮抗、共培养和离体果实回接等测定菌株hjt6对灰霉病菌的防治效果。【结果】菌株hjt6鉴定为贝莱斯芽孢杆菌;在10-50℃时均能生长,30℃为最适生长温度,在pH 5.0-9.0时均能生长,pH 7.0时生长最好,在0-10%NaCl浓度下均能生长;菌株hjt6对8种作物病原菌均具有一定程度的抑制作用,抑制率为57.38%-82.18%;在平板上对灰霉病菌的抑制能力为“++++”,抑制率为71.53%,共培养能降低灰霉病菌菌丝质量77.31%,离体果实回接防效高达92.63%。【结论】菌株hjt6对瓠瓜灰霉病菌具有较好的拮抗效果,可作为拮抗灰霉病菌的菌种资源。

关键词：贝莱斯芽孢杆菌鉴定生长特性瓠瓜灰霉病拮抗效果

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Biosynthesis of trialkyl-substituted aromatic polyketide NFAT-133 involves unusual P450 monooxygenase-mediating aromatization and a putative metallo-beta-lactamase fold hydrolase

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Synthetic and Systems Biotechnology 2023年第3期8卷 349-356页

作者： Ming Yang Wanlu Li Lin Zhou Xiao Lin wenyu zhang Yaoyao Shen Hai Deng Hou-wen Lin Yongjun Zhou research Center for Marine Drugs Department of PharmacyRen Ji HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai200127China institute of Marine Drugs Guangxi Key Laboratory of Marine DrugsGuangxi University of Chinese MedicineNanning530200PR China Department of Chemistry University of AberdeenAberdeenAB243UEUK

The bacterial trialkyl-substituted aromatic polyketides are structurally featured with the unusual aromatic core in the middle of polyketide chain such as TM-12.(1),veramycin A(2.,NFAT-133(3)and benwamycin I(4),which were discovered from Streptomyces species and demonstrated with antidiabetic and immunosuppressant *** the biosynthetic pathway of 1-3 was reported as a type I polyketide synthase(PKS),the PKS assembly line was interpreted inconsistently,and it remains a mystery how the compound 3 was ***,the PKS assembly logic of 1-4 was revised by site-mutagenetic analysis of the PKS dehydratase *** on gene deletion and complementation,the putative P450 monooxygenase nftE1 and metallo-beta-lactamase(MBL)fold hydrolase nftF1 were verified as essential genes for the biosynthesis of *** absence of nftE1 led to abolishment of 1-4 and accumulation of new products(5-8).Structural elucidation reveals 5-8 as the non-aromatic analogs of 1,suggesting the NftE1-catalyzed aromatic core *** of nftF1 resulted in disappearance of 3 and 4 with the compounds 1 and 2.*** a rare MBL-fold hydrolase from type I PKSs,NftF1 potentially generates the compound 3 through two strategies:catalyze premature chain-offloading as a trans-acting thioesterase or hydrolyze the lactone-bond of compound 1 as an esterase.

关键词： Thioesterase Metallo hydrolase Metallo-beta-lactamase Aromatic polyketide Polyketide synthase P450 monooxygenase

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Emission Behaviors of Submicron Particles(PM_(1))Generated by the Combustion of Sesame Stalk after Combined Water Washing and Carbonization Pretreatment

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Energy Engineering 2021年第3期118卷 473-485页

作者： Tianyu Liu Chang Wen wenyu Wang Kai Yan Yongjun Xia Rui Li Juan Liu Yang zhang State Key Laboratory of Coal Combustion School of Energy and Power EngineeringHuazhong University of Science and TechnologyWuhan430074China Department of New Energy Science and Engineering School of Energy and Power EngineeringHuazhong University of Science and TechnologyWuhan430074China China-EU institute for Clean and Renewable Energy Huazhong University of Science and TechnologyWuhan430074China State Grid Jiangxi Electric Power Science research institute Nanchang330096China

Pretreatment before biomass combustion is significant for its efficient utilization and that combined water washing and carbonization can be *** agricultural processing residues sesame stalk was selected and carried out two pretreatments separately,i.e.,water washing-torrefaction(W-T)and torrefaction-water washing(T-W),to explore the effect on the fuel properties,combustion characteristics and particulate matter(PM)*** obtained biochar was also combusted under air and oxy50(CO_(2.:O_(2.=50:50)conditions for the sake of investigating the effect of pretreatment and combustion *** results indicate that,W-T and T-W both not only have great effect on the improvement of fuel properties but also reduce the content of water-soluble elements like K,Cl,*** to the difference in hydrophobicity,the biochar obtained by W-T have the optimal fuel *** the same time,the pretreatment also hinder the combustion in a certain extent in which the comprehensive combustion characteristics(SN)show a downward ***,both two pretreatments have obvious benefit on the reduction of PM_(1)emission and W-T have the best effect related to the higher removal efficiency of inorganic elements(especially K+Na+Cl+S).Under oxy50 condition,the oxygen concentration and combustion temperature is higher,improving the sulfation of K and vaporization of Ca,P and Mg which result in weakening in the pretreatment reduction effect on PM_(1)emission.

关键词： Biomass torrefaction water washing oxy-fuel PM_(1)

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Simulation Computation and Experimental Investigation on Inflatable Rubber Boat Based on Fluid-Structure Interaction Analysis

Simulation Computation and Experimental Investigation on Inf...

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第一届交通运输工程国际学术会议

作者： Zhou Jianhui1 Liu Zhenglin1 zhang Junwu1 Huang Shengquan2.1School of Energy and Power Engineering Wuhan University of Technology Wuhan China 430063 2.uzhou ocean ship {2. institute Fuzhou 350009

The interaction between a moving inflatable rubber boat and water is a nonlinear Fluid-Structure Interaction （FSI） problem. Based on the fundamental theory of Navier-Stokes equation in the incompressible fluid, a three-dimensional finite element model is built to investigate the stress and deformation distribution of the inflatable rubber boat running at high speed by means of FSI, and to seek the state of the stress and strain of the inflatable boat with certain hull form under various conditions. Its speed-resistance property is analyzed in the software Maxsurf for ship design and compared with the data of the trial. The results show that the deformation of the inflatable rubber boat gradually becomes larger from the stern to the bow and the stress concentration occurs on the joint among the diaphragm plate and the circular cylinders and the supporting engine zone on diaphragm plate. With the increasing speed, the deformation and stress become larger correspondingly and the speed-resistance property of the boat coincides with the experimental data.

关键词： Inflatable rubber boat Finite element method Fluid-Structure Interaction Deformation Resistance

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薄膜式LNG运输船温度场研究

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天然气工业 2005年第10期25卷 110-112页

作者：章伟星李科浚周昊柳春图中国船级社北京化工大学中国科学院力学研究所

液化天然气运输船液货舱热维护系统是一个结构复杂的、具有第三类边界条件的、多层平壁的稳态导热与自然对流及辐射换热相互耦合的三维复杂传热系统。针对这一复杂系统,考虑了船体主要构件、骨材、空腔空气对流、表面间的辐射对换热的影... 详细信息

液化天然气运输船液货舱热维护系统是一个结构复杂的、具有第三类边界条件的、多层平壁的稳态导热与自然对流及辐射换热相互耦合的三维复杂传热系统。针对这一复杂系统,考虑了船体主要构件、骨材、空腔空气对流、表面间的辐射对换热的影响,建立了数学模型,并给出了基于通用软件ANSYS的数值计算方法;还以某艘LNG运输船为例,进行了温度场的有限元分析。结果表明,所给出的对LNG运输船液货舱热维护系统的热分析方法是有效的。

关键词：薄膜式液化天然气运输船温度场有限元分析日蒸发率 LNG运输船液化天然气运输船第三类边界条件辐射换热

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Long-term winter observation of nitrous acid in the urban area of Beijing

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Journal of Environmental Sciences 2022年第4期34卷 334-342页

作者： Chaofan Lian Weigang Wang Yan Chen Yusheng zhang Jingwei zhang Yongchun Liu Xiaolong Fan Chang Li Junlei Zhan Zhuohui Lin Chenjie Hua {2. zhang Mingyuan Liu Junling Li Xuefei Wang Junling An Maofa Ge State Key Laboratory for Structural Chemistry of Unstable and Stable Species CAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of the Chinese Academy of Sciences Beijing 100049China Aerosol and Haze Laboratory Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijing100029China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry(LAPC) Institute of Atmospheric Physics(IAP)Chinese Academy of SciencesBeijing 100029China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China Center for Excellence in Urban Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China

The particulate matter(PM)pollution has been significantly improved by carrying out various valid emission control strategies since 2.13 in *** the variation trend of nitrous acid(HONO)is worthy to investigate due to its vital role in the atmospheric oxidation *** this study,field observation in the winter is conducted to investigate the concentration of HONO in an urban area of *** the winter of 2.19,the mean HONO concentration is 1.38 ppbV during the whole ***-enhanced NO_(2.heterogeneous reactions on the ground and aerosol surfaces were found as the possible daytime sources of *** to O_(3),photolysis of HONO dominates the primary OH sources during the winter *** understand the HONO pollution patterns by years variation,multi-year data is summarized and finds that primary pollutants including CO and NO decreased,but secondary pollutants i.e.,HONO(mostly generated via secondary process)*** study highlights the requirement to mitigate secondary pollution by control HONO concentration.

关键词： Nitrous acid Field observation Winter air pollution

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基于ANSYS的曲轴-滑动轴承系统动力学模型的研究

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系统仿真学报 2008年第20期20卷 5706-5709,5713页

作者：张锁怀李磊张江峰上海应用技术学院机械与自动化工程学院上海200235 陕西科技大学机电工程学院咸阳712081

在考虑滑动轴承油膜刚度和阻尼的基础上,利用ANSYS建立了大功率低速船用柴油机曲轴转子—轴承系统的动力学模型。研究了转速变化时系统固有频率的影响规律,计算了系统的前6阶振型,用ANSYS谐响应分析法,研究了系统的不平衡响应。研究发... 详细信息

在考虑滑动轴承油膜刚度和阻尼的基础上,利用ANSYS建立了大功率低速船用柴油机曲轴转子—轴承系统的动力学模型。研究了转速变化时系统固有频率的影响规律,计算了系统的前6阶振型,用ANSYS谐响应分析法,研究了系统的不平衡响应。研究发现不平衡质量可以激起轴向振动;系统的振动多以耦合振动方式出现;此类曲轴固有频率很低,只能在低速条件下工作和加工。通过对曲轴转子振动规律的研究,为曲轴精加工时切削用量的选择提供理论依据。

关键词：曲轴滑动轴承固有频率不平衡响应

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