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Advances in Climate Change Research 2024年第2期15卷 230-243页

作者： Hang PAN Jian-Ping TANG Liang cheng Man-Chun LI Jiangsu Provincial key Laboratory of Geographic Information science and Technology Nanjing UniversityNanjing 210023China school of Geography and Ocean science Nanjing UniversityNanjing 210023China key Laboratory of Mesoscale severe Weather/Ministry of Education Nanjing UniversityNanjing 210023China school of Atmospheric sciences Nanjing UniversityNanjing 210023China

The kherlen River is the main water source for Hulun Lake,the largest lake in northern *** to reduced inflow from the kherlen River,Hulun Lake experienced rapid shrinkage at the beginning of the 21st century,posing a serious threat to the ecological security of northern ***,there is still a significant lack of projections regarding future climate change and its hydrological response in the kherlen River *** study analyzed the projected climate and streamflow changes in the kherlen River basin,a vital yet vulnerable international semi-arid steppes type basin.A combination of multi-model ensemble projection techniques,and the soil and water assessment tool(sWAT)model was employed to examine the spatio-temporal changes in precipitation,temperature,streamflow,and the associated uncertainties in the *** temperature(an increase of 1.84-6.42℃)and the precipitation(an increase of 15.0-46.0 mm)of kherlen River basin are projected to increase by 2100,leading to a rise in streamflow(1.08-4.78 m^(3) s^(-1)).The upstream of the kherlen River exhibits remarkable increasing trends in precipitation,which has a dominant influence on streamflow of kherlen *** increases in streamflow are observed in April,August,september,and October compared to the reference period(1971-2000).These findings suggest a partial alleviation of water scarcity in the kherlen River,but also an increased likelihood of hydrological extreme *** projected temperature increase in the kherlen River basin exhibits the smallest uncertainty,while more pronounced uncertainties are found in precipitation and *** spread among the results of CMIP6 models is greater than that of CMIP5 models,with lower signal-to-noise ratio(sNR)values for temperature,precipitation,and streamflow.

关键词： Climate change Flow projection Uncertainty sWAT Mongolian Plateau

Effect of Frequency on Degradation in BOPP Films Under Repetitively Pulsed Voltage

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CsEE Journal of Power and Energy systems 2024年第3期10卷 1280-1290页

作者： Chuansheng Zhang Yu Feng Fei kong Bangdou Huang cheng Zhang Tao shao Beijing International s&T Cooperation Base for Plasma science and Energy Conversion Institute of Electrical EngineeringChinese Academy of SciencesBeijing 100190China University of Chinese Academy of sciences Beijing 100049China

Operating conditions of film capacitors are complex,and the problem of film insulation failure caused by repetitively pulsed voltage is becoming ever *** of the film under repetitively pulsed voltage cannot be accurately evaluated by the average breakdown electric *** this paper,the effects of pulsed electric field and pulse repetition frequency on the breakdown in biaxially oriented polypropylene(BOPP)films are *** phases of BOPP degradation are proposed based on the voltage amplitude,i.e.,maintenance(M),decline(D),and near-zero(N).Evolution of the BOPP film from degradation to breakdown at different frequencies is ***,transition of discharge mode and elemental composition of the film are *** results show continuous heat generation under repetitive microsecond pulses is the dominant factor for degradation of BOPP *** number of applied pulses and the repetitive stressing time decrease exponentially with increase of *** research can be contributed to the safe and reliable operation of capacitors.

关键词： Aging breakdown film capacitor polypropylene repetitive pulse

superhydrophobic Co/Fe sulfide nanoparticles and single-atoms doped carbon nanosheets composite air cathode for high-performance zinc-air batteries

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Journal of Energy Chemistry 2024年第9期96卷 568-577页

作者： Yan Tan Yijie Wang Aoshuang Li Xiucai Jiang Yuzhong Zhang Chuanwei cheng shanghai key Laboratory of special Artificial Microstructure Materials and Technology School of Physics Science and EngineeringTongji UniversityShanghai 200092China

Development of a high-performance bifunctional catalyst is essential for the actual implementation of zinc-air batteries in practical ***,a bifunctional cathode of Co_(3)s_(4)/Fes heterogeneous nanoparticles embedded in Co/Fe single-atom-loaded nitrogen-doped carbon nanosheets is ***-iron sulfides and single atomic sites with Co-N_(4)/Fe-N_(4)configurations are confirmed to coexist on the carbon matrix by EXAFs spectroscopy.3D self-supported super-hydrophobic multiphase composite cathode provides abundant active sites and facilitates gas–liquid-solid three-phase interface reactions,resulting in excellent electrocatalytic activity and batteries performance,i.e.,an OER overpotential(η_(10))of 260 mV,a half-wave potential(E_(1/2))of 0.872 V for ORR,aΔE of 0.618 V,and a discharge power density of 170 mW cm^(−2),a specific capacity of 816.3 mAh g^(−1).DFT analysis shows multiphase coupling of sulfide heterojunction through single-atomic metal doped carbon nanosheets reduces offset on center of electronic density of states before and after oxygen adsorption,and spin density of adsorbed oxygen with same spin orientation,leading to weakened charge/spin interactions between adsorbed oxygen and substrate,and a lowered oxygen adsorption energy to accelerate OER/ORR.

关键词： Zn-air battery superhydrophobic interface Metal sulfide Heterostructure spin density

Ultra-high sensitivity fiber optic microphone with corrugated graphene-oxide diaphragm for voice recognition

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Nano Research 2024年第8期17卷 7593-7602页

作者： Yang Liu cheng Li Lingxiao Yu Zhengwei Wu shangchun Fan Ruitao Lv school of Instrumentation and Optoelectronic Engineering Beihang UniversityBeijing 100191China shenzhen Institute of Beihang University Shenzhen 518063China key Laboratory of Advanced Materials(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Aerospace Information Research Institute Chinese Academy of SciencesBeijing 100190China

To avoid interference from unexpected background noises and obtain high fidelity voice signal,acoustic sensors with high sensitivity,flat frequency response,and high signal-to-noise ratio(sNR)are urgently needed for voice ***(GO)has received extensive attention due to its advantages of controllable thickness and high fracture ***,low mechanical sensitivity(sM)introduced by undesirable initial stress limits the performance of GO material in the field of voice *** alleviate the aforementioned issue,GO diaphragm with annular corrugations is *** means of the reusable copper mold machined by picosecond laser,the fabrication and transfer of corrugated GO diaphragm are realized,thus achieving a Fabry–Perot(F–P)acoustic *** from the structural advantage of the corrugated GO diaphragm,our F–P acoustic sensor exhibits high s_(M)(43.70 nm/Pa@17 kHz),flat frequency response(−3.2 to 3.7 dB within 300–3500 Hz),and high sNR(76.66 dB@1 kHz).In addition,further acoustic measurements also demonstrate other merits,including an excellent frequency detection resolution(0.01 Hz)and high time stability(output relative variation less than 6.7%for 90 min).Given the merits presented before,the fabricated F–P acoustic sensor with corrugated GO diaphragm can serve as a high-fidelity platform for acoustic detection and voice *** conjunction with the deep residual learning framework,high recognition accuracy of 98.4%is achieved by training and testing the data recorded by the fabricated F–P acoustic sensor.

关键词： corrugated graphene-oxide(GO)diaphragm Fabry-Perot(F-P)acoustic sensor mechanical sensitivity voice recognition

Thermal runaway evolution of a 280 Ah lithium-ion battery with LiFePO_(4) as the cathode for different heat transfer modes constructed by mechanical abuse

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Journal of Energy Chemistry 2024年第6期93卷 32-45,I0002页

作者： Zhixiang cheng chengdong Wang Wenxin Mei Peng Qin Junyuan Li Qingsong Wang state key Laboratory of Fire science University of Science and Technology of ChinaHefei 230026AnhuiChina

Lithium iron phosphate batteries have been increasingly utilized in recent years because their higher safety performance can improve the increasing trend of recurring thermal runaway ***,the safety performance and mechanism of high-capacity lithium iron phosphate batteries under internal short-circuit challenges remain to be *** work analyzes the thermal runaway evolution of high-capacity LiFePO_(4) batteries under different internal heat transfer modes,which are controlled by different penetration *** penetration cases involving complete penetration and incomplete penetration were detected during the test,and two modes were performed incorporating nails that either remained or were removed after penetration to comprehensively reveal the thermal runaway mechanism.A theoretical model of microcircuits and internal heat conduction is also *** results indicated three thermal runaway evolution processes for high-capacity batteries,which corresponded to the experimental results of thermal equilibrium,single thermal runaway,and two thermal runaway *** difference in heat distribution in the three phenomena is determined based on the microstructure and material structure near the *** controlling the heat dissipation conditions,the time interval between two thermal runaway events can be delayed from 558 to 1417 s,accompanied by a decrease in the concentration of in-situ gas production during the second thermal runaway event.

关键词： Lithium-ion battery safety Micro short-circuit cell Heat transfer modes Internal short circuit Nail-penetration test

A new era for paclitaxel biosynthesis is coming

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Molecular Plant 2024年第3期17卷 370-371页

作者： Xiaonan Liu Xiaoxi Zhu Jian cheng Huifeng Jiang key Laboratory of Engineering Biology for Low-carbon Manufacturing Tianjin Institute of Industrial BiotechnologyChinese Academy of SciencesTianjin 300308China National Center of Technology Innovation for synthetic Biology Tianjin 300308China

Paclitaxel(Taxol)stands out as a tetracyclic diterpenoid natural product derived from the endangered plant *** as a pivotal broad-spectrum anticancer drug,it has garnered widespread attention due to its low yield,intricate structure,unique anticancer mechanism,and remarkable efficacy(Tong et al.,2021).Although chemists achieved the total synthesis of paclitaxel 30 years ago,after decades of research,the natural biosynthetic pathway for its production remains an enigma(Ajikumar et al.,2010;Malci et al.,2023).A recent breakthrough,published in Molecular Plant by Alisdair ***'s team,unveils a minimal gene set of 18 genes required for paclitaxel biosynthesis(Zhang et al.,2023),representing a significant mark toward unraveling the entire biosynthetic pathway and enhancing paclitaxel production efficiency.

关键词： breakthrough representing synthesis

Numerical simulation of liquid sloshing in a spherical tank by MPs method

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Journal of Hydrodynamics 2024年第2期36卷 232-240页

作者： Cong-yi Huang Ji-fei Wang Wei-wen Zhao De-cheng Wan Computational Marine Hydrodynamic Lab(CMHL) School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China shanghai Aerospace system Engineering Institute Shanghai201109China

This paper investigates the sloshing phenomena in a spherical liquid tank using the moving particle semi-implicit(MPs)method,a crucial study in fluid *** from previous research focused on rectangular or LNG tanks,this work explores the unique motion patterns inherent to spherical *** accuracy of our in-house MPs solver MLParticle-sJTU is validated against experimental data and finite volume method(FVM).And the MPs method reveals a closer alignment with experimental outcomes,which suggests that MPs method is particularly effective for modeling complex,non-linear fluid *** the fluid’s response to excitation at its natural frequency is simulated,showcasing vigorous sloshing and rotational *** analyses of the fluid motion are conducted by drawing streamline diagrams,velocity vector diagrams,and vorticity *** fluid’s motion response is explored using both time-domain and frequency-domain curves of the fluid centroid,as well as the sloshing force.

关键词： Moving particle semi-implicit(MPs)method spherical tank liquid sloshing model experiment

Overcoming the Na-ion conductivity bottleneck for the cost-competitive chloride solid electrolytes

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Journal of Energy Chemistry 2024年第8期95卷 1-8,I0001页

作者： Lv Hu Hui Li Fang Chen Yating Liu Jinzhu Wang cheng Ma Hefei National Research Center for Physical sciences at the Microscale CAS Key Laboratory of Materials for Energy ConversionDepartment of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026AnhuiChina National synchrotron Radiation Laboratory Hefei 230026AnhuiChina

Chloride solid electrolytes possess multiple advantages for the construction of safe,energy-dense allsolid-state sodium batteries,but presently the chlorides with sufficiently high cost-competitiveness for commercialization almost all exhibit low Na-ion conductivities of around 10^(-5)s cm^(-1)or ***,we report a chloride solid electrolyte,Na_(2.7)ZFCl_(5.3)O_(0.7),which reaches a Na-ion conductivity of 2.29×10^(-4)s cm^(-1)at 25℃without involving overly expensive raw materials such as rare-earth chlorides or Na_(2)*** addition to the efficient ion transport,Na_(2.7)ZrCl_(5.3)O_(0.7)also shows an excellent deformability surpassing that of the widely studied Na_(3)Ps_(4),Na_(3)sbs_(4),and Na_(2)ZrCl_(6)solid *** combination of these advantages allows the all-solid-state cell based on Na_(2.7)ZrCl_(5.3)O_(0.7)and NaCrO_(2)to realize stable room-temperature cycling at a much higher specific current than those based on other non-viscoelastic chloride solid electrolytes in literature(120 mA g^(-1)vs.12-55 mA g^(-1));after 100 cycles at such a high rate,the Na_(2.7)ZFCl_(5.3)O_(0.7)-based cell can still deliver a discharge capacity of 80 mAh g^(-1)at25℃.

关键词： All-solid-state sodium batteries Ionic conductivities solid electrolytes Chlorides High voltage stability

Defect-mode and Fabry-Perot resonance induced multi-band nonreciprocal thermal radiation

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science China Technological sciences 2024年第8期67卷 2405-2412页

作者： CHEN ZiHe YU shiLv YUAN cheng CUI XinYou HU Run school of Energy and Power Engineering Huazhong University of Science and Technology Wuhan Fiberhome Fuhua Electric Co. Ltd.

According to kirchhoff's radiation law, the spectral-directional absorptivity(α) and spectral-directional emissivity(e) of an object are widely believed to be identical, which places a fundamental limit on photonic energy conversion and *** introduction of Weyl semimetals and magneto-optical(MO) materials into photonic crystals makes it possible to violate kirchhoff's law, but most existing work only report the unequal absorptivity and emissivity spectra in a single band, which cannot meet the requirements of most practical applications. Here, we introduce a defect layer into the structure composed of one-dimensional(1D) magnetophotonic crystal and a metal layer, which realizes dual-band nonreciprocal thermal radiation under a 3-T magnetic field with an incident angle of 60°. The realization of dual-band nonreciprocal radiation is mainly due to the Fabry-Perot(FP) resonance occurring in the defect layer and the excitation of Tamm plasmon, which is proved by calculating the magnetic field distribution. In addition, the effects of incident angle and structural parameters on nonreciprocity are also *** is more, the number of nonreciprocal bands could be further increased by tuning the defect layer thickness. When the defect layer thickness increases to 18.2 μm, tri-band nonreciprocal thermal radiation is realized due to the enhanced number of defect modes in the photonic band gap and the FP resonance occurring in the defect layer. Finally, the effect of defect location on nonreciprocity is also discussed. The present work provides a new way for the design of multi-band or even broad-band nonreciprocal thermal emitters.

关键词： kirchhoff’s law multi-band nonreciprocal thermal radiation magnetophotonic crystal Tamm plasmon defect layer Fabry-Perot resonance