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枸杞中微生物降解β-胡萝卜素特性研究

食品科技 2016年第11期41卷 31-35页

作者：刘亚李金鹏齐晓琴王晓昌付丽霞刘建花张惠玲宁夏大学农学院银川750021

以枸杞鲜果为原料分离了可降解β-胡萝卜素的微生物,并对其进行分离鉴定,得出降解特性。实验经初步分离鉴定共得到7株可降解β-胡萝卜素的细菌,再经16S r DNA分子生物学鉴定发现实则共有3种细菌,其中L-1、L-3是Enterobacter *** NA17,L-... 详细信息

以枸杞鲜果为原料分离了可降解β-胡萝卜素的微生物,并对其进行分离鉴定,得出降解特性。实验经初步分离鉴定共得到7株可降解β-胡萝卜素的细菌,再经16S r DNA分子生物学鉴定发现实则共有3种细菌,其中L-1、L-3是Enterobacter *** NA17,L-2、L-4、L-7是Enterobacter ludwigii,L-5、L-6是Enterobacter cloacae。

关键词：枸杞 β-胡萝卜素降解

Deep Reinforcement Learning Based Power Minimization for RIS-Assisted MISO-OFDM Systems

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China Communications 2023年第4期20卷 259-269页

作者： peng Chen Wenting Huang xiao Li Shi jin National Mobile Communications Research Laboratory Southeast UniversityNanjing 210096China

In this paper,we investigate the downlink orthogonal frequency division multiplexing(OFDM)transmission system assisted by reconfigurable intelligent surfaces(RISs).Considering multiple antennas at the base station(BS)and multiple single-antenna users,the joint optimization of precoder at the BS and the phase shift design at the RIS is studied to minimize the transmit power under the constraint of the certain quality-of-service.A deep reinforcement learning(DRL)based algorithm is proposed,in which maximum ratio transmission(MRT)precoding is utilized at the BS and the twin delayed deep deterministic policy gradient(TD3)method is utilized for RIS phase shift *** results demonstrate that the proposed DRL based algorithm can achieve a transmit power almost the same with the lower bound achieved by manifold optimization(MO)algorithm while has much less computation delay.

关键词： deep reinforcement learning OFDM precoding reconfigurable intelligent surface

Sinogram denoising via attention residual dense convolutional neural network for low-dose computed tomography

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Nuclear Science and Techniques 2021年第4期32卷 70-83页

作者： Yin-jin Ma Yong Ren peng Feng peng He xiao-Dong Guo Biao Wei Key Laboratory of Optoelectronic Technology and Systems Ministry of EducationChongqing UniversityChongqing 400044China School of Data Science Tongren UniversityTongren 554300China School of Microelectronics and Communication Engineering Chongqing UniversityChongqing 400044China Department of Biomedical Engineering Rensselaer Polytechnic InstituteTroyNY 12180USA

The widespread use of computed tomography(CT)in clinical practice has made the public focus on the cumulative radiation dose delivered to ***-dose CT(LDCT)reduces the X-ray radiation dose,yet compromises quality and decreases diagnostic *** have made great efforts to develop various algorithms for LDCT and introduced deep-learning techniques,which have achieved impressive ***,most of these methods are directly performed on reconstructed LDCT images,in which some subtle structures and details are readily lost during the reconstruction procedure,and convolutional neural network(CNN)-based methods for raw LDCT projection data are rarely *** address this problem,we adopted an attention residual dense CNN,referred to as AttRDN,for LDCT sinogram ***,it was aided by the attention mechanism,in which the advantages of both feature fusion and global residual learning were used to extract noise from the contaminated LDCT ***,the denoised sinogram was restored by subtracting the noise obtained from the input noisy ***,the CT image was reconstructed using filtered *** experimental results qualitatively and quantitatively demonstrate that the proposed AttRDN can achieve a better performance than state-of-the-art ***,it can prevent the loss of detailed information and has the potential for clinical application.

关键词： Low-dose CT Sinogram denoising Deep learning Attention mechanism

Sulfolane‑Based Flame‑Retardant Electrolyte for High‑Voltage Sodium‑Ion Batteries

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Nano-Micro Letters 2025年第2期17卷 498-516页

作者： Xuanlong He Jie peng Qingyun Lin Meng Li Weibin Chen Pei Liu Tao Huang Zhencheng Huang Yuying Liu Jiaojiao Deng Shenghua Ye Xuming Yang Xiangzhong Ren xiaoping Ouyang Jianhong Liu Biwei xiao Jiangtao Hu Qianling Zhang Graphene Composite Research Center College of Chemistry and Environmental EngineeringShenzhen UniversityShenzhen 518060People’s Republic of China Center of Electron Microscopy State Key Laboratory of Silicon and Advanced Semiconductor MaterialsSchool of Materials Science and EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China GRINM(Guangdong)Research Institute for Advanced Materials and Technology FoshanGuangdong 528051People’s Republic of China College of Energy Engineering Zhejiang UniversityHangzhouZhejiang 310027People’s Republic of China School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105People’s Republic of China Shenzhen Eigen-Equation Graphene Technology Co.Ltd Shenzhen 518000People’s Republic of China

Sodium-ion batteries hold great promise as next-generation energy storage ***,the high instability of the electrode/electrolyte interphase during cycling has seriously hindered the development of *** particular,an unstable cathode–electrolyte interphase(CEI)leads to successive electrolyte side reactions,transition metal leaching and rapid capacity decay,which tends to be exacerbated under high-voltage ***,constructing dense and stable CEIs are crucial for high-performance *** work reports localized high-concentration electrolyte by incorporating a highly oxidation-resistant sulfolane solvent with non-solvent diluent 1H,1H,5H-octafluoropentyl-1,1,2,2-tetrafluoroethyl ether,which exhibited excellent oxidative stability and was able to form thin,dense and homogeneous *** excellent CEI enabled the O3-type layered oxide cathode NaNi_(1/3)Mn_(1/3)Fe_(1/3)O_(2)(NaNMF)to achieve stable cycling,with a capacity retention of 79.48%after 300 cycles at 1 C and 81.15%after 400 cycles at 2 C with a high charging voltage of 4.2 *** addition,its nonflammable nature enhances the safety of *** work provides a viable pathway for the application of sulfolane-based electrolytes on SIBs and the design of next-generation high-voltage electrolytes.

关键词： Sodium-ion batteries Sulfolane-based electrolyte High voltage Layered oxide cathode Flame retardant

A numerical study of the early-stage dynamics of a bubble cluster

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Journal of Hydrodynamics 2020年第5期32卷 845-852页

作者： Ya-zhen Shi Kai Luo xiao-peng Chen Dai-jin Li School of Marine Science and Technology Northwestern Polytechnical UniversityXi’an 710072China School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi’an 710129China

The dynamics of multiple cavitating bubbles is numerically simulated,with the ambient pressure lower than the saturated vapor pressure,using a pseudopotential lattice Boltzmann method(LBM)coupled with the Camahan-Starling equation of ***-bubble and multi-bubble systems are tested,and the method for the bubble cluster is *** is found that the bubble can either grow or collapse in the early stage,depending on the configuration of the bubble cluster,characterized by the bubble number,the inter-bubble distance and the initial *** the induced flow,the bubbles are mutually *** relations of the interaction are proposed according to the numerical *** consideration of the interactions,the simplified Rayleigh-Plesset equations(RPEs)for multiple bubbles can describe the evolution of the bubbles *** results may serve as the basis for improved cavitation models.

关键词： Cavitation bubble dynamics interaction lattice Boltzmann method(LBM) Rayleigh-Plesset equation(RPE)

Palladium-catalyzed enantioselective carbonylation reactions

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Science China Chemistry 2022年第3期65卷 441-461页

作者： jin-Bao peng Xin-Lian Liu Lin Li xiao-Feng Wu School of Biotechnology and Health Sciences Wuyi UniversityJiangmen 529020China Dalian National Laboratory for Clean Energy Dalian Institute of Chemical PhysicsChinese Academy of SciencesLiaoning 116023China Leibniz-Institut für Katalyse e.V. Albert-Einstein-Straße 29aRostock 18059Germany

Carbonylation,one of the most powerful approaches to the preparation of carbonylated compounds,has received significant attention from researchers active in various ***,impressive progress has been made on this subject over the past few *** the various types of carbonylation reactions,asymmetric carbonylation is a straightforward methodology for constructing chiral *** rhodium-catalyzed enantioselective hydroformylations have been discussed in several elegant reviews,a general review on palladium-catalyzed asymmetric carbonylations is still *** this review,we summarize and discuss recent achievements in palladium-catalyzed asymmetric carbonylation ***,this review’s contents are categorized by reaction type.

关键词： palladium catalyst enantioselective carbonylation chiral

Co_(3)O_(4)/stainless steel catalyst with synergistic effect of oxygen vacancies and phosphorus doping for overall water splitting

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Tungsten 2023年第1期5卷 100-108页

作者： xiao-xiao Li xiao-Chao Liu Chao Liu jin-Ming Zeng xiao-peng Qi College of Rare Earth Jiangxi University of Science and TechnologyGanzhou 341000China Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou 341000China

The electrolysis of water into hydrogen and oxygen provides an effective means of storing electrical energy *** current challenge is to design an optimal catalyst that exhibits low overpotentials,long-term stability,universal availability,and only uses inexpensive ***,a Co3O4nanoflower/stainless steel(P-Ov-CO_(3)O_(4)/SS) catalyst with both oxygen vacancies(Ovs) and phosphorus doping was perfectly prepared via a simple three-step *** Ovs promoted charge transfer and accelerated the electrocatalysis,while P finely tuned the surface charge *** resulted in numerous active sites for catalysis,and the synergistic effect of phosphorus doping and oxygen vacancies was finely *** resultant electrocatalyst exhibited low hydrogen evolution overpotentials of 118 mV(-10 mA·cm^(-2)) and 242(-200 mA·cm^(-2)),as well as oxygen evolution overpotentials of 327 mV(100 mA·cm^(-2)) and 370 mV(200 mA·cm^(-2)),owing to the excellent synergistic effect of the Ovs and low-temperature ***,P-Ov-Co_(3)O_(4)/SS//P-Ov-Co_(3)O_(4)/SS exhibited a low water splitting voltage of 1.681 V at 20 *** findings will enable the synthesis of novel high-performance electrocatalysts for overall water splitting.

关键词： Oxygen vacancy Phosphorus doping P-Ov-Co_(3)O_(4)/SS Overall water splitting

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爆炸切割网络传爆中的间隙与角度效应

火工品 2025年第1期 37-43页

作者：周晓鹏姜勇袁航中国船舶集团有限公司第七一三研究所河南郑州450015 河南省水下智能装备重点实验室河南郑州450015

为研究爆炸切割网络中传爆节点处传爆能力的关键影响因素,通过改变切割索对传爆药柱的传爆间隙进行了平板传爆试验,将试验结果结合仿真分析确定了JO-11C传爆药柱的仿真材料参数,并进一步分析了传播角度对传爆能力的影响。研究结果表明:... 详细信息

为研究爆炸切割网络中传爆节点处传爆能力的关键影响因素,通过改变切割索对传爆药柱的传爆间隙进行了平板传爆试验,将试验结果结合仿真分析确定了JO-11C传爆药柱的仿真材料参数,并进一步分析了传播角度对传爆能力的影响。研究结果表明:随着传爆间隙的增加,传爆能力下降,切割索对传爆药柱的最大传爆间隙区间为2.0~2.5 mm;同时,传爆角度的增大能够显著提高传爆能力。本研究为爆炸切割网络的传爆性能研究以及提高武器系统的可靠性提供了参考。

关键词：爆炸切割网络传爆间隙传爆角度传爆药柱仿真分析

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An internal cooling grinding wheel:From design to application

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Chinese Journal of Aeronautics 2023年第11期36卷 465-482页

作者： Xiangwu xiao Yufeng jin Meiliang CHEN Ruitao peng Heng TANG Jiangxiong GAO School of Mechanical Engineering Xiangtan UniversityXiangtan 411105China College of Mechatronics and Control Engineering Shenzhen UniversityShenzhen 518000China Zhuzhou Huarui Precision Tools Co.LTD Zhuzhou 412000China

The cooling and lubrication conditions during the grinding process significantly impact the nickel-based superalloy’s final service *** existing jet cooling and heat pipe technology can solve the heat conduction problem in the grinding process of ***,managing cooling,lubrication,and chip removal are *** paper describes the design and fabrication of a novel central fluid-through internal cooling slotted grinding wheel with an ordered grain pattern to improve the grinding machinability of a nickel-based *** pressurized grinding fluid was ejected into the grinding zone via the pipe and tool holder from the lower-end face of the inner cooling *** structure of the grinding wheel was optimized using computational fluid dynamics(CFD).The flow field in the grinding area achieved the highest overall flow rate,distribution homogeneity,and effective exit flow when the internal flow channel had four *** exit for the inner runner is located at the abrasive edge and diamond staggered ***-layer brazing was used to create cubic boron nitride(CBN)abrasive rings with various abrasive *** internal cooling wheel matrix and various components were prepared according to the optimized grinding wheel geometry model.A grinding test bench was built to conduct an experimental study of grinding the nickel-based alloy *** results show that,under the same conditions,a diamond-shaped staggered pattern obtains lower grinding temperature,lower surface roughness,better surface morphology,and more significant residual compressive stress distribution than an abrasive cluster diagonal circular staggered pattern or disordered *** average effective flow rate calculated by CFD is increased by 42.3%when compared to the disordered *** the experiment,compared to the disordered arrangement,with the increase of grinding wheel’s rotating speed and coolant pressure,the average grinding temperature of abras

关键词： Flow field analysis Grinding experiment Internal cooling grinding wheel Ordered pattern Surface hardening