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Polymerization of Dicyclopentadiene by Reaction Injection Molding

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Chinese Chemical Letters 1998年第6期9卷 591-593页

作者： Li, HM Jiang, ZM Wu, YX liu, YQ liu, ps Xiangtan Univ Dept Polymer Mat Sci & Engn Xiangtan 411105 Peoples R China

Dicyclopentadiene was polymerized by reaction injection molding (RIM) using a catalyst system based on molybdenum (V) chloride and anhydrous aluminum chloride and triethylaluminum. The effect of the reaction temperatu... 详细信息

关键词： dicyclopentadiene metathesis ring-opening polymerization reaction injection molding polydicyclopentadiene

A 128×128 SPAD LiDAR sensor with column-parallel 25 ps resolution TA-ADCs

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Journal of Semiconductors 2024年第8期45卷 34-40页

作者： Na Tian Zhe Wang Kai Ma Xu Yang Nan Qi Jian liu Nanjian Wu Runjiang Dou Liyuan liu State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100049China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

This paper presents a design of single photon avalanche diode(SPAD)light detection and ranging(LiDAR)sensor with 128×128 pixels and 128 column-parallel time-to-analog-merged-analog-to-digital converts(TA-ADCs).Unlike the conventional TAC-based SPAD LiDAR sensor,in which the TAC and ADC are separately implemented,we propose to merge the TAC and ADC by sharing their capacitors,thus avoiding the analog readout noise of TAC’s output buffer,improving the conversion rate,and reducing chip *** reverse start-stop logic is employed to reduce the power of the *** in a 180 nm CMOS process,our prototype sensor exhibits a timing resolution of 25 ps,a DNL of+0.30/−0.77 LSB,an INL of+1.41/−2.20 LSB,and a total power consumption of 190 mW.A flash LiDAR system based on this sensor demonstrates the function of 2D/3D imaging with 128×128 resolution,25 kHz inter-frame rate,and sub-centimeter ranging precision.

关键词： 3D imaging CMOS imagers direct time-of-flight(dTOF) time-to-analog converter(TAC)

Si-doped Li6ps5I with enhanced conductivity enables superior performance for all-solid-state lithium batteries

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Chinese Chemical Letters 2024年第10期35卷 505-510页

作者： Liang Ming Dan liu Qiyue Luo Chaochao Wei Chen liu Ziling Jiang Zhongkai Wu Lin Li Long Zhang Shijie Cheng Chuang Yu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology School of Chemistry and Chemical Engineering Huazhong University of Science and Technology State Grid Hubei Electric Power Research Institute College of Physics and Energy Fujian Normal University

Lithium argyrodites Li6ps5X（X = Cl, Br, I） show great potential as solid electrolytes for solid-state lithium batteries due to their high Li-ion conductivities and excellent electrode compatibility. However, the relatively low conductivity of Li6ps5I(10-6m S/cm) compared to the other two compositions limits its applications. Herein, Si-doped Li6.5P0.5Si0.5S5I electrolyte is designed and synthesized with superior high conductivity of 3.6 mS/cm. Structural characterization proves the increase due to the anion disorder and volume expansion caused by Si-doping. However, the poor interfacial stability between layered oxide cathode Li Ni0.6Co0.2Mn0.2O2and Li6.5P0.5Si0.5S5I inhibits its battery performance. By introducing Li3InCl6electrolyte in the configuration, the corresponding battery delivers high initial discharge capacity of 150.2m Ah/g and superior cyclability during 250 cycles at 0.5 C. This work offers design strategy to obtain Li6ps5I-based electrolytes for high performance solid-state batteries.

关键词： All-solid-state lithium batteries Argyrodite electrolyte Electrochemical performance Li6.5P0.5Si0.5S5I Stability

Transient Monte Carlo simulation of phonon transport in silicon nanofilms with the local heat source

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Science China(Technological Sciences) 2024年第7期67卷 2087-2098页

作者： LI JiaQi CAI JiuQing LI Rui liu ZhiChun liu Wei School of Energy and Power Engineering Huazhong University of Science and TechnologyWuhan 430074China Wuhan Second Ship Design and Research Institute Wuhan 430205China

Accurate prediction of junction temperature is crucial for the efficient thermal design of silicon nano-devices. In nano-scale semiconductor devices, significant ballistic effects occur due to the mean free path of phonons comparable to the heat source size and device scale. We employ a three-dimensional non-gray Monte Carlo simulation to investigate the transient heat conduction of silicon nanofilms with both single and multiple heat sources. The accuracy of the present method is first verified in the ballistic and diffusion limits. When a single local heat source is present, the width of the heat source has a significant impact on heat conduction in the domain. Notably, there is a substantial temperature jump at the boundary when the heat source width is 10 *** increasing heat source width, the boundary temperature jump weakens. Furthermore, we observe that the temperature excitation rate is independent of the heat source width, while the temperature influence range expands simultaneously with the increase in heat source width. Around 500 ps, the temperature and heat flux distribution in the domain stabilize. In the case of dual heat sources, the hot zone is broader than that of a single heat source, and the temperature of the hot spot decreases as the heat source spacing increases. However, the mean heat flux remains unaffected. Upon reaching a spacing of 200 nm between the heat sources, the peak temperature in the domain remains unchanged once a steady state is reached. These findings hold significant implications for the thermal design of silicon nano-devices with local heat sources.

关键词： phonon transport Monte Carlo simulation transient heat conduction silicon nanofilms local heat source

High Energy Efficiency Dynamic Connected Hybrid Precoding for mm Wave Massive MIMO Systems

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China Communications 2024年第5期21卷 36-44页

作者： Du Ruiyan liu Huajing Li Tiangui liu Fulai Lab of Key Technology of Millimeter-wave Large-scale MIMO System Northeastern University at QinhuangdaoQinhuangdao066004China School of Computer Science and Engineering Northeastern UniversityShenyang 110819China

This paper considers a high energy efficiency dynamic connected(HEDC)structure,which promotes the practicability and reduces the power consumption of hybrid precoding system by lowresolution phase shifters(pss).Based on the proposed structure,a new hybrid precoding algorithm is presented to optimize the energy efficiency,namely,HP-HEDC ***,via a new defined effective optimal precoding matrix,the problem of optimizing the analog switch precoding matrix is formulated as a sparse representation ***,the optimal analog switch precoding matrix can be readily obtained by the branch-and-bound ***,the digital precoding matrix optimization problem is modeled as a dictionary update problem and solved by the method of optimal direction(MOD).Finally,the diagonal entries of the analog ps precoding matrix are optimized by exhaustive search independently since ps and antenna is *** results show that the HEDC structure enjoys low power consumption and satisfactory spectral *** proposed algorithm presents at least 50%energy efficiency improvement compared with other algorithms when the ps resolution is set as 3-bit.

关键词： energy efficiency hybrid precoding mmWave optimized resolution phase shifter

Endoplasmic reticulum stress-induced NLRP3 inflammasome activation as a novel mechanism of polystyrene microplastics (ps-Mps)-induced pulmonary inflammation in chickens

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2024年第3期25卷 233-243页

作者： Hongmin LU Tiantian GUO Yue ZHANG Dewang liu Lulu HOU Chengxue MA Mingwei XING College of Wildlife and Protected Area Northeast Forestry UniversityHarbin 150040China

Microplastics(Mps)have attracted growing attention worldwide as an increasingly prevalent environmental *** addition,chicken meat is currently the most widely consumed kind of poultry in the global *** demand for chicken is on the rise both at home and *** a result,the safety of chicken raising has also received significant *** lungs play an essential role in the physiological activities of chickens,and they are also the most vulnerable *** injury is difficult to repair after the accumulation of contaminants,and the mortality rate is high,which brings huge economic losses to *** research on the toxicity of Mps has mainly focused on the marine ecosystem,while the mechanisms of toxicity and lung damage in chickens have been poorly ***,this study explored the effects of exposure to polystyrene microplastics(ps-Mps)at various concentrations for 42 d on chicken ***-Mps could cause lung pathologies and ultrastructural abnormalities,such as endoplasmic reticulum(ER)swelling,inflammatory cell infiltration,chromatin agglutination,and plasma membrane ***,ps-Mps increased the expression of genes related to the heat shock protein family(Hsp60,Hsp70,and Hsp90),ER stress signaling(activating) transcription factor 6(ATF0),ATF4,protein kinase RNA-like ER kinase(PERK),and eukaryotic translation initiation factor 2 subunitα(eIF2a),pyroptosis-related genes(NOD)-,LRR-and pyrin domain-containing protein 3(NLRP3),apoptosis-associated speck-like protein containing a caspase recruitment domain(ASC),interleukin-1β(IL-1β),cysteinyl aspartate-specific proteinase 1(Caspasel),and gasdermin-D(GSDMD),and the inflammatory signaling pathway(nuclear factor-kB(NF-kB),inducible nitric oxide synthase(iNOS),and cyclooxygenase-2(COX-2).The above results showed that ps-MP exposure could result in lung stress,ER stress,pyroptosis,and inflammation in *** findings provide new scientific clues for further research o

关键词： Polystyrene microplastics Endoplasmic reticulum stress Lung NLRP3 inflammasome Inflammation

In-situ formation of nitrogen doped microporous carbon nanospheres derived from polystyrene as lubricant additives for anti-wear and friction reduction

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Friction 2024年第3期12卷 439-451页

作者： Yixin WANG Qi LU Huijie XIE Shujuan liu Qian YE Feng ZHOU Weimin liu State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi'an 710072China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China

This study presents a nitrogen-doped microporous carbon nanospheres(N@MCNs)prepared by a facile polymerization–carbonization process using low-cost *** N element in situ introduces polystyrene(ps)nanospheres via emulsion polymerization of styrene with cyanuric chloride as crosslinking agent,and then carbonization obtains N@*** as-prepared carbon nanospheres possess the complete spherical structure and adjustable nitrogen amount by controlling the relative proportion of tetrachloromethane and cyanuric *** friction performance of N@MCNs as lubricating oil additives was surveyed utilizing the friction experiment of ball-disc *** results showed that N@MCNs exhibit superb reduction performance of friction and *** the addition of N@MCNs was 0.06 wt%,the friction coefficient of PAO-10 decreased from 0.188 to 0.105,and the wear volume reduced by 94.4%.The width and depth of wear marks of N@MCNs decreased by 49.2% and 94.5%,*** carrying capacity of load was rocketed from 100 to 400 N *** the analysis of the lubrication mechanism,the result manifested that the prepared N@MCNs enter clearance of the friction pair,transform the sliding friction into the mixed friction of sliding and rolling,and repair the contact surface through the repair ***,the tribochemical reaction between nanoparticles and friction pairs forms a protective film containing nitride and metal oxides,which can avert direct contact with the matrix and improve the tribological *** experiment showed that nitrogen-doped polystyrene-based carbon nanospheres prepared by in-situ doping are the promising materials for wear resistance and reducing *** preparing method can be ulteriorly expanded to multi-element co-permeable *** and boron co-doped carbon nanospheres(B,N@MCNs)were prepared by mixed carbonization of N-enriched ps and boric acid,and exhibited high load carrying capacity and good tribolog

关键词： lubricant additives hypercrosslinked polystyrene carbon nanospheres friction reduction anti-wear

Terahertz Irradiation Improves Cognitive Impairments and Attenuates Alzheimer’s Neuropathology in the APpsWE/ps1DE9 Mouse:A Novel Therapeutic Intervention for Alzheimer’s Disease

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Neuroscience Bulletin 2024年第7期40卷 857-871页

作者： Jun Zhang Yixin Chen Yarui Zhao Panpan Wang Hongbin Ding Cong liu Junhong Lyu Weidong Le Liaoning Provincial Key Laboratory for Research on the Pathogenic Mechanisms of Neurological Diseases the First Affiliated HospitalDalian Medical UniversityDalian 116011China School of Physics Dalian University of TechnologyDalian 116024China Interdisciplinary Research Center on Biology and Chemistry Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 201210China Advanced Research Institute Chinese Academy of SciencesShanghai 201203China Department of Neurology and Institute of Neurology Sichuan Academy of Medical Sciences‑Sichuan Provincial HospitalMedical SchoolUniversity of Electronic Science and Technology of ChinaChengdu 610072China

Alzheimer's disease(AD)is a progressive neurodegenerative disease characterized by the deposition of amyloid-β(Aβ),neurofibrillary tangles,neuroinflammation,and neurodegeneration in the *** recent years,considering the unsatisfied benefits of pharmacological therapies,non-pharmacological therapy has become a research hotspot for AD ***(THz)waves with a range between microwave and infrared regions in the electromagnetic spectrum and high permeability to a wide range of materials have great potential in the bioengineering ***,its biological impacts on the central nervous system,under either physiological or pathological conditions,are poorly *** this study,we first measured the 0.14 THz waves penetration across the skull of a C57BL/6 mouse and found the percentage of THz penetration to be~70%,guaranteeing that THz waves can reach the relevant brain *** then exposed the APpsWE/ps1DE9 mouse model of AD to repeated low-frequency THz waves on the *** demonstrated that THz waves treatment significantly improved the cognitive impairment and alleviated AD neuropathology including Aβdeposition and tau hyperphosphorylation in the AD ***,THz waves treatment effectively attenuated mitochondrial impairment,neuroinflammation,and neuronal loss in the AD mouse *** findings reveal previously unappreciated beneficial effects of THz waves treatment in AD and suggest that THz waves may have the potential to be used as a novel therapeutic intervention for this devastating disease.

关键词： Alzheimer's disease Cognitive impairment Senile plaque Tau protein Terahertz

Vibration attenuation performance of wind turbine tower using a prestressed tuned mass damper under seismic excitation

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Earthquake Engineering and Engineering Vibration 2024年第2期23卷 511-524页

作者： Lei Zhenbo liu Gang Wang Hui Hui Yi School of Civil Engineering Chongqing UniversityChongqing 400045China Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing UniversityMinistry of EducationChongqing 400045China

With the rapid development of large megawatt wind turbines,the operation environment of wind turbine towers(WTTs)has become increasingly *** particular,seismic excitation can create a resonance response and cause excessive vibration of the *** investigate the vibration attenuation performance of the WTT under seismic excitations,a novel passive vibration control device,called a prestressed tuned mass damper(ps-TMD),is presented in this ***,a mathematical model is established based on structural dynamics under seismic ***,the mathematical analytical expression of the dynamic coefficient is deduced,and the parameter design method is obtained by system tuning ***,based on a theoretical analysis and parameter design,the numerical results showed that the ps-TMD was able to effectively mitigate the resonance under the harmonic basal ***,the time-history analysis method is used to verify the effectiveness of the traditional pendulum tuned mass damper(PTMD)and the novel ps-TMD device,and the results indicate that the vibration attenuation performance of the ps-TMD is better than the *** addition,the ps-TMD avoids the nonlinear effect due to the large oscillation angle,and has the potential to dissipate hysteretic energy under seismic excitation.

关键词： wind turbine tower prestressed tuned mass damper vibration control seismic excitation numerical simulation