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制浆造纸翻译工作坊平台START翻译实训模式研究与实践
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作者 吕晶 赵丽娜 《造纸科学与技术》 2024年第8期157-160,共4页
制浆造纸专业英语翻译在当今全球化的经济环境中扮演着非常重要的角色,不仅是技术交流的工具,还是推动文化交流、学术研究以及国际贸易的重要力量。针对如今制浆造纸专业英语翻译教学存在的种种问题,提出基于翻译工作坊平台的START翻译... 制浆造纸专业英语翻译在当今全球化的经济环境中扮演着非常重要的角色,不仅是技术交流的工具,还是推动文化交流、学术研究以及国际贸易的重要力量。针对如今制浆造纸专业英语翻译教学存在的种种问题,提出基于翻译工作坊平台的START翻译实训模式。对此,对比分析了制浆造纸传统英语翻译教学与翻译工作坊教学的区别,探究了START翻译实训模式的构成与在制浆造纸专业英语翻译教学中的应用意义,并研究了基于翻译工作坊的制浆造纸专业英语START翻译实训模式的构建与实施策略,以期发挥START翻译实训的教学价值,提升制浆造纸专业英语翻译教学水平。 展开更多
关键词 制浆造纸 英语翻译 翻译工作坊平台 start翻译实训 实践
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汉英温觉词“冷/cold”的隐喻对比研究
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作者 吕兆格 唐远远 《开封文化艺术职业学院学报》 2024年第5期62-66,共5页
温度是人类最早的认知领域之一。汉语和英语中存在大量描述温度感觉的词语,它们既指身体感知到的温度概念,又能映射到人类的心理态度等范畴,表达由温度义引申出的其他概念。文章从认知语言学的视角出发,借助隐喻理论,系统梳理汉英温觉... 温度是人类最早的认知领域之一。汉语和英语中存在大量描述温度感觉的词语,它们既指身体感知到的温度概念,又能映射到人类的心理态度等范畴,表达由温度义引申出的其他概念。文章从认知语言学的视角出发,借助隐喻理论,系统梳理汉英温觉词“冷/cold”基于身体认知的隐喻映射,得出语域映射的基本模式和结论。此外,受语言文化等因素的影响,“冷/cold”的隐喻映射也呈现出一种同异并存的现象。 展开更多
关键词 cold 温觉词 隐喻 汉英对比
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Electronically Controlling the System of Preheating Intake Air by Flame for Diesel Engine Cold-Start 被引量:2
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作者 杜巍 赵福堂 《Journal of Beijing Institute of Technology》 EI CAS 2003年第2期158-161,共4页
In order to improve the cold start performance of heavy duty diesel engine, electronically controlling the preheating of intake air by flame was researched. According to simulation and thermodynamic analysis about th... In order to improve the cold start performance of heavy duty diesel engine, electronically controlling the preheating of intake air by flame was researched. According to simulation and thermodynamic analysis about the partial working processes of the diesel engine, the amount of heat energy, enough to make the fuel self ignite at the end of compression process at different temperatures of coolant and intake air, was calculated. Several HY20 preheating plugs were used to heat up the intake air. Meanwhile, an electronic control system based on 8 bit micro controller unit (MCS 8031) was designed to automatically control the process of heating intake air. According to the various temperatures of coolant and ambient air, one plug or two plugs can automatically be selected to heat intake air. The demo experiment validated that the total system could operate successfully and achieve the scheduled function. 展开更多
关键词 diesel engine cold start preheating intake air electronically control
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Cold Start Problem of Vehicle Model Recognition under Cross-Scenario Based on Transfer Learning 被引量:1
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作者 Hongbo Wang Qian Xue +2 位作者 Tong Cui Yangyang Li Huacheng Zeng 《Computers, Materials & Continua》 SCIE EI 2020年第4期337-351,共15页
As a major function of smart transportation in smart cities,vehicle model recognition plays an important role in intelligent transportation.Due to the difference among different vehicle models recognition datasets,the... As a major function of smart transportation in smart cities,vehicle model recognition plays an important role in intelligent transportation.Due to the difference among different vehicle models recognition datasets,the accuracy of network model training in one scene will be greatly reduced in another one.However,if you don’t have a lot of vehicle model datasets for the current scene,you cannot properly train a model.To address this problem,we study the problem of cold start of vehicle model recognition under cross-scenario.Under the condition of small amount of datasets,combined with the method of transfer learning,load the DAN(Deep Adaptation Networks)and JAN(Joint Adaptation Networks)domain adaptation modules into the convolutional neural network AlexNet and ResNet,and get four models:AlexNet-JAN,AlexNet-DAN,ResNet-JAN,and ResNet-DAN which can achieve a higher accuracy at the beginning.Through experiments,transfer the vehicle model recognition from the network image dataset(source domain)to the surveillance-nature dataset(target domain),both Top-1 and Top-5 accuracy have been improved by at least 20%. 展开更多
关键词 Vehicle model recognition transfer learning cold start and artificial intelligence
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Alleviating the Cold Start Problem in Recommender Systems Based on Modularity Maximization Community Detection Algorithm 被引量:4
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作者 S. Vairachilai M. K. Kavithadevi M. Raja 《Circuits and Systems》 2016年第8期1268-1279,共12页
Recommender system (RS) has become a very important factor in many eCommerce sites. In our daily life, we rely on the recommendation from other persons either by word of mouth, recommendation letters, movie, item and ... Recommender system (RS) has become a very important factor in many eCommerce sites. In our daily life, we rely on the recommendation from other persons either by word of mouth, recommendation letters, movie, item and book reviews printed in newspapers, etc. The typical Recommender Systems are software tools and techniques that provide support to people by identifying interesting products and services in online store. It also provides a recommendation for certain users who search for the recommendations. The most important open challenge in Collaborative filtering recommender system is the cold start problem. If the adequate or sufficient information is not available for a new item or users, the recommender system runs into the cold start problem. To increase the usefulness of collaborative recommender systems, it could be desirable to eliminate the challenge such as cold start problem. Revealing the community structures is crucial to understand and more important with the increasing popularity of online social networks. The community detection is a key issue in social network analysis in which nodes of the communities are tightly connected each other and loosely connected between other communities. Many algorithms like Givan-Newman algorithm, modularity maximization, leading eigenvector, walk trap, etc., are used to detect the communities in the networks. To test the community division is meaningful we define a quality function called modularity. Modularity is that the links within a community are higher than the expected links in those communities. In this paper, we try to give a solution to the cold-start problem based on community detection algorithm that extracts the community from the social networks and identifies the similar users on that network. Hence, within the proposed work several intrinsic details are taken as a rule of thumb to boost the results higher. Moreover, the simulation experiment was taken to solve the cold start problem. 展开更多
关键词 Collaborative Recommender Systems cold start Problem Community Detection Pearson Correlation Coefficient
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Numerical Simulation of Cold-Start Emission for the Three-Way Catalytic Converter: Mathematical Model and Result Analysis
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作者 吴国江 黄震 陈晓玲 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2004年第3期363-371,共9页
This paper integrated a two-dimensional axisymmetrical transient model applicable to cold-start emission applications. The model can be used to simulate and explain effects of the flow and temperature distribution on ... This paper integrated a two-dimensional axisymmetrical transient model applicable to cold-start emission applications. The model can be used to simulate and explain effects of the flow and temperature distribution on performance of a converter. The evolutions of distribution of the temperature and concentration in the monolith during the cold-start period and the effects of flow distribution in the monolith on the cold-start performance are simulated in terms of the integrated model. The investigation indicates that the axial and radial gradients of temperature of the solid become steeper as the inlet gas temperature ramp increases; this furthermore results in the movement of reaction region in the monolith, and the flow distribution in the monolith affects the radial distribution of temperature of the solid;the radial gradients of temperature of the solid become greater as the flow uniformity index decreases, whereas the light-off time doesn't always increase as the flow uniformity index decreases. The analyses on the distribution of temperature and concentration in the monolith show that the catalytic reaction zone concentrates in central area near the front face. The predicted curves of the velocity distribution have a good agreement with the experimental data. 展开更多
关键词 cold start numerical simulation MODEL catalytic converter EMISSION flow distribution
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Frontogenesis and Frontolysis of a Cold Filament Driven by the Cross-Filament Wind and Wave Fields Simulated by a Large Eddy Simulation 被引量:1
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作者 Guojing LI Dongxiao WANG +3 位作者 Changming DONG Jiayi PAN Yeqiang SHU Zhenqiu ZHANG 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2024年第3期509-528,共20页
The variations of the frontogenetic trend of a cold filament induced by the cross-filament wind and wave fields are studied by a non-hydrostatic large eddy simulation. Five cases with different strengths of wind and w... The variations of the frontogenetic trend of a cold filament induced by the cross-filament wind and wave fields are studied by a non-hydrostatic large eddy simulation. Five cases with different strengths of wind and wave fields are studied.The results show that the intense wind and wave fields further break the symmetries of submesoscale flow fields and suppress the levels of filament frontogenesis. The changes of secondary circulation directions—that is, the conversion between the convergence and divergence of the surface cross-filament currents with the downwelling and upwelling jets in the filament center—are associated with the inertial oscillation. The filament frontogenesis and frontolysis caused by the changes of secondary circulation directions may periodically sharpen and smooth the gradient of submesoscale flow fields.The lifecycle of the cold filament may include multiple stages of filament frontogenesis and frontolysis. 展开更多
关键词 cold filament FRONTOGENESIS FRONTOLYSIS large eddy simulation
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MIR1868 negatively regulates rice cold tolerance at both the seedling and booting stages 被引量:1
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作者 Yang Shen Xiaoxi Cai +7 位作者 Yan Wang Wanhong Li Dongpeng Li Hao Wu Weifeng Dong Bowei Jia Mingzhe Sun Xiaoli Sun 《The Crop Journal》 SCIE CSCD 2024年第2期375-383,共9页
Low temperature causes rice yield losses of up to 30%–40%,therefore increasing its cold tolerance is a breeding target.Few genes in rice are reported to confer cold tolerance at both the vegetative and reproductive s... Low temperature causes rice yield losses of up to 30%–40%,therefore increasing its cold tolerance is a breeding target.Few genes in rice are reported to confer cold tolerance at both the vegetative and reproductive stages.This study revealed a rice-specific 24-nt miRNA,miR1868,whose accumulation was suppressed by cold stress.Knockdown of MIR1868 increased seedling survival,pollen fertility,seed setting,and grain yield under cold stress,whereas its overexpression conferred the opposite phenotype.Knockdown of MIR1868 increased reactive oxygen species(ROS)scavenging and soluble sugar content under cold stress by increasing the expression of peroxidase genes and sugar metabolism genes,and its overexpression produced the opposite effect.Thus,MIR1868 negatively regulated rice cold tolerance via ROS scavenging and sugar accumulation. 展开更多
关键词 RICE cold tolerance MIRNA ROS scavenging Soluble sugar accumulation
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PHD17 acts as a target of miR1320 to negatively control cold tolerance via JA-activated signaling in rice 被引量:1
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作者 Yan Wang Yang Shen +6 位作者 Weifeng Dong Xiaoxi Cai Junkai Yang Yue Chen Bowei Jia Mingzhe Sun Xiaoli Sun 《The Crop Journal》 SCIE CSCD 2024年第5期1447-1458,共12页
Plant Homeo Domain(PHD)proteins are involved in diverse biological processes during plant growth.However,the regulation of PHD genes on rice cold stress response remains largely unknown.Here,we reported that PHD17 neg... Plant Homeo Domain(PHD)proteins are involved in diverse biological processes during plant growth.However,the regulation of PHD genes on rice cold stress response remains largely unknown.Here,we reported that PHD17 negatively regulated cold tolerance in rice seedlings as a cleavage target of miR1320.PHD17 expression was greatly induced by cold stress,and was down-regulated by miR1320 overexpression and up-regulated by miR1320 knockdown.Through 5'RACE and dual luciferase assays,we found that miR1320 targeted and cleaved the 3'UTR region of PHD17.PHD17 was a nuclearlocalized protein and acted as a transcriptional activator in yeast.PHD17 overexpression reduced cold tolerance of rice seedlings,while knockout of PHD17 increased cold tolerance,partially via the CBF cold signaling.By combining transcriptomic and physiological analyses,we demonstrated that PHD17 modulated ROS homeostasis and flavonoid accumulation under cold stress.K-means clustering analysis revealed that differentially expressed genes in PHD17 transgenic lines were significantly enriched in the jasmonic acid(JA)biosynthesis pathway,and expression of JA biosynthesis and signaling genes was verified to be affected by PHD17.Cold stress tests applied with MeJA or IBU(JA synthesis inhibitor)further suggested the involvement of PHD17 in JA-mediated cold signaling.Taken together,our results suggest that PHD17 acts downstream of miR1320 and negatively regulates cold tolerance of rice seedlings through JA-mediated signaling pathway. 展开更多
关键词 RICE cold tolerance PHD protein miR1320 JA signaling
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AS/400系统如何进行MIMIX系统Cold Start
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作者 梁钊 《华南金融电脑》 2008年第3期20-22,共3页
在AS/400系统上,Lakeview公司的MIMIX数据同步系统是一个比较好的解决AS/400系统双机备份问题的产品。但由于数据库的分类管理或应用程序设计不恰当,当数据库频繁地生成和删除临时文件,而系统交易量和系统资源占用较大时,或者是... 在AS/400系统上,Lakeview公司的MIMIX数据同步系统是一个比较好的解决AS/400系统双机备份问题的产品。但由于数据库的分类管理或应用程序设计不恰当,当数据库频繁地生成和删除临时文件,而系统交易量和系统资源占用较大时,或者是生产系统数据库因特别原因需要删除再恢复时,MIMIX系统有时会出现数据同步速度追不上的情况,若未及时检查和处理,时间一长,Data Group(简称DG)会出现大量的DB和OBJ同步错误的情况。 展开更多
关键词 AS/400系统 X系统 cold 应用程序设计 同步系统 数据库 双机备份 分类管理
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Endogenous serotonin induced by cold acclimation increases cold tolerance by reshaping the MEL/ROS/RNS redox network in Kandelia obovata
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作者 Junjian Li Huiyu Zhang +4 位作者 Danfei Yue Siyi Chen Yaxin Yin Chunfang Zheng Yan Chen 《Journal of Forestry Research》 SCIE EI CAS CSCD 2024年第6期73-85,共13页
Cold stress severely limits the distribution of mangrove species worldwide and it remains unclear how mangroves respond and adapt to cold temperatures.In this study,we investigated the effects of cold acclimation and/... Cold stress severely limits the distribution of mangrove species worldwide and it remains unclear how mangroves respond and adapt to cold temperatures.In this study,we investigated the effects of cold acclimation and/or inhibition of serotonin levels on reactive oxygen species(ROS),reactive nitrogen species(RNS),melatonin(MEL)and serotonin(SER)accumulation during cold stress in Kandelia obovata.Morphologic observation and param-eter analysis revealed that cold acclimation mitigated the photoinhibition of photosystem I(PSI)and photosystem II(PSII),maintained optimal ROS and RNS redox homeosta-sis,and increased the contents of SER and MEL in leaves.This suggests that cold acclimation reshapes the MEL/ROS/RNS redox network.In particular,the tryptophan/tryptamine/Ser/N-acetylserotonin/MER pathway was identi-fied as a branch of the MEL synthesis pathway.Inhibition of endogenous SER exacerbated damage caused by cold stress,indicating the crosstalk of SER synthesis and cold acclima-tion.In this study,we report a coordinated regulation of cold stress by a complex defense network in K.obovata. 展开更多
关键词 cold acclimation SEROTONIN MELATONIN cold stress MANGROVES
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Effect of β-Glucan (Angel Yeast) Compared to a Placebo on Cold and Flu Incidence and Symptoms in an Adult Population—A Double Blind, Randomised Controlled Trial
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作者 David Briskey Haibo Zhang +1 位作者 Zhixian Chen Amanda Rao 《Food and Nutrition Sciences》 CAS 2024年第6期484-497,共14页
Background: 1-3, 1-6 β-glucan derived from Baker’s yeast (Saccharomyces cerevisiae) has been widely studied for its immune stimulatory capabilities and safety. Previous studies found β-glucan to have efficacy at re... Background: 1-3, 1-6 β-glucan derived from Baker’s yeast (Saccharomyces cerevisiae) has been widely studied for its immune stimulatory capabilities and safety. Previous studies found β-glucan to have efficacy at reducing incidence of URTIs as well as being a low risk for negative side effects. The current study aimed to examine the effects of yeast β-glucan (Angel Yeast) on cold and flu incidences and symptoms in healthy adults. Methods: Two hundred and thirty-one males and females aged 18 to 65 years old supplemented with either β-glucan or a placebo for 3-months. Participants completed a general health questionnaire every 4 weeks and in addition, if participants experienced any cold or flu symptoms, these were recorded daily (along with severity) until resolved or up to 2 weeks. Results: Supplementation with β-glucan reduced the self-reported severity of sore throats and improved sleep quality compared to the placebo group. Conclusions: Yeast β-glucan supplementation appears to be able to help reduce certain symptoms experienced during a cold or flu episode and is safe and well tolerated. 展开更多
关键词 BETA-GLUCAN cold FLU Baker’s Yeast
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《老年人潜在不适当处方筛查工具/处方遗漏筛查工具(STOPP/START)标准》第3版解读
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作者 朱素燕 郑晓梦 +1 位作者 范苗 陈春燕 《中国全科医学》 CAS 北大核心 2024年第33期4097-4104,共8页
老年人潜在不适当处方筛查工具(STOPP)/处方遗漏筛查工具(START)由2008年爱尔兰Cork大学附属医院专家组首次发表并于2015年进行第2次更新。自发表以来,该标准在发现老年人潜在不适当用药、加强对老年人滥用药物的监管、减少老年人药品... 老年人潜在不适当处方筛查工具(STOPP)/处方遗漏筛查工具(START)由2008年爱尔兰Cork大学附属医院专家组首次发表并于2015年进行第2次更新。自发表以来,该标准在发现老年人潜在不适当用药、加强对老年人滥用药物的监管、减少老年人药品不良事件等方面发挥了积极作用。2023年第3版STOPP/START标准发布,在第2版基础上增加、修订和删减了一些标准,最终形成190条潜在不适当用药标准。新标准根据最新的老年人合理用药研究结果和临床证据,提供了更新、更实用的循证医学依据。本文对STOPP/START标准(第3版)进行了详细的解读,为我国潜在不适当用药标准更新和完善提供参考,并对未来该领域的研究方向提出思考和建议。 展开更多
关键词 潜在不当用药 老年人潜在不适当处方筛查工具 STOPP/start标准 老年人 多重用药 Beers标准
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The UDP-glycosyltransferase OsUGT706D2 positively regulates cold and submergence stress tolerance in rice
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作者 Qing Liu Lanlan Zhang +12 位作者 Shuwei Lyu Hang Yu Wenjie Huang Liqun Jiang Jing Zhang Bingrui Sun Xingxue Mao Pingli Chen Junlian Xing Wenfeng Chen Zhilan Fan Shijuan Yan Chen Li 《The Crop Journal》 SCIE CSCD 2024年第3期732-742,共11页
In a genome-wide association study,we identified a rice UDP-glycosyltransferase gene,OsUGT706D2,whose transcription was activated in response to cold and submergence stress and to exogenous abscisic acid(ABA).OsUGT706... In a genome-wide association study,we identified a rice UDP-glycosyltransferase gene,OsUGT706D2,whose transcription was activated in response to cold and submergence stress and to exogenous abscisic acid(ABA).OsUGT706D2 positively regulated the biosynthesis of tricin-4’-O-(syringyl alcohol)ether-7-O-glucoside at both the transcriptional and metabolic levels.OsUGT706D2 mediated cold and submergence tolerance by modulating the expression of stress-responsive genes as well as the abscisic acid(ABA)signaling pathway.Gain of function of OsUGT706D2 increased cold and submergence tolerance and loss of function of OsUGT706D2 reduced cold tolerance.ABA positively regulated OsUGT706D2-mediated cold tolerance but reduced submergence tolerance.These findings suggest the potential use of OsUGT706D2 for improving abiotic stress tolerance in rice. 展开更多
关键词 UDP-glycosyltransferase RICE cold tolerance Submergence tolerance ABA
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Simulation of Start-Up Process of Turbofan Engine Based on Full-State Characteristics of Fan
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作者 FANG Jun ZHANG Tianhong 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2024年第S01期27-34,共8页
Difficulties in obtaining component characteristics in the sub-idle state of rotor constrain the simulation capabilities of ground and windmill start-up processes for turbofan engines.This paper proposes a backbone fe... Difficulties in obtaining component characteristics in the sub-idle state of rotor constrain the simulation capabilities of ground and windmill start-up processes for turbofan engines.This paper proposes a backbone feature method based on conventional characteristics parameters to derive the full-state characteristics of fan.The application of the fan’s full-state characteristics in component-level model of turbofan engine enables zero-speed iterative simulation for ground start-up process and windmill simulation for windmill start-up process,thereby improving the simulation capability of sub-idle state during turbofan engine start-up. 展开更多
关键词 ground start‑up simulation windmill start‑up simulation full‑state characteristics turbofan engine modeling
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Boosting thermoelectric efficiency of Ag_(2)Se through cold sintering process with Ag nano-precipitate formation
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作者 Dejwikom Theprattanakorn Thanayut Kaewmaraya Supree Pinitsoontorn 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2024年第12期2760-2769,共10页
Silver selenide(Ag_(2)Se)stands out as a promising thermoelectric(TE)material,particularly for applications near room temper-atures.This research presents a novel approach for the fabrication of bulk Ag_(2)Se samples ... Silver selenide(Ag_(2)Se)stands out as a promising thermoelectric(TE)material,particularly for applications near room temper-atures.This research presents a novel approach for the fabrication of bulk Ag_(2)Se samples at a relatively low temperature(170℃)using the cold sintering process(CSP)with AgNO_(3)solution as a transient liquid agent.The effect of AgNO_(3)addition during CSP on the micro-structure and TE properties was investigated.The results from phase,composition and microstructure analyses showed that the introduc-tion of AgNO_(3)solution induced the formation of Ag nano-precipitates within the Ag_(2)Se matrix.Although the nano-precipitates do not af-fect the phase and crystal structure of orthorhombicβ-Ag_(2)Se,they suppressed crystal growth,leading to reduced crystallite sizes.The samples containing Ag nano-precipitates also exhibited high porosity and low bulk density.Consequently,these effects contributed to sig-nificantly enhanced electrical conductivity and a slight decrease in the Seebeck coefficient when small Ag concentrations were incorpor-ated.This resulted in an improved average power factor from~1540μW·m^(−1)·K^(−2)for pure Ag_(2)Se to~1670μW·m^(−1)·K^(−2)for Ag_(2)Se with additional Ag precipitates.However,excessive Ag addition had a detrimental effect on the power factor.Furthermore,thermal conductiv-ity was effectively suppressed in Ag_(2)Se fabricated using AgNO_(3)-assisted CSP,attributed to enhanced phonon scattering at crystal inter-faces,pores,and Ag nano-precipitates.The highest figure-of-merit(zT)of 0.92 at 300 K was achieved for the Ag_(2)Se with 0.5wt%Ag dur-ing CSP fabrication,equivalent to>20%improvement compared to the controlled Ag_(2)Se without extra Ag solution.Thus,the process outlined in this study presents an effective strategy to tailor the microstructure of bulk Ag_(2)Se and enhance its TE performance at room temperature. 展开更多
关键词 THERMOELECTRIC silver selenide CHALCOGENIDE cold sintering process nano-precipitate
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Transcription factor CabHLH035 promotes cold resistance and homeostasis of reactive oxygen species in pepper
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作者 Huafeng Zhang Jiangbai Guo +7 位作者 Xiaoqing Chen Yunyun Zhou Yingping Pei Lang Chen Saeed ul Haq Mingke Zhang Haijun Gong Rugang Chen 《Horticultural Plant Journal》 SCIE CAS CSCD 2024年第3期823-836,共14页
Plant basic helix-loop-helix(bHLH)transcription factors(TFs)play central roles in various abiotic stresses.However,its role in plant cold resistance is largely unknown.Previously,we characterised CaNAC035 in pepper,wh... Plant basic helix-loop-helix(bHLH)transcription factors(TFs)play central roles in various abiotic stresses.However,its role in plant cold resistance is largely unknown.Previously,we characterised CaNAC035 in pepper,which positively regulates tolerance to cold,salt and drought stresses tolerance.Here,we identified CabHLH035,a CaNAC035-interacting protein in pepper.To explore its functions in cold stress tolerance,we silenced the gene in pepper via virus-induced gene silencing(VIGS)and overexpressed the gene in Arabidopsis.The results showed that CabHLH035 expression was induced by cold treatment,and silencing of CabHLH035 decreased cold stress tolerance.Conversely,overexpression of CabHLH035 in Arabidopsis increased cold stress tolerance.To investigate homologs genes of C-repeat binding factor(CBF)pathway proteins and reactive oxygen species(ROS)marker gene expression blocking by CabHLH035,we performed yeast one-hybrid(Y1H),dual luciferase and electrophoretic mobility shift assay experiments.The results showed that CabHLH035 bound to the region upstream of the CaCBF1A and CaAPX promoters.Additionally,CaCBF1A bound to the CaDHN4 promoter.Taken together,our results showed that CabHLH035 plays a crucial role in cold stress tolerance and its potential as a target for breeding cold-resistant crops.The findings provide a basis for studying the functions and regulatory network of cold stress tolerance in pepper. 展开更多
关键词 PEPPER CabHLH035 SILENCING Overexpression VIGS cold tolerance
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Extreme Antarctic Cold of Late Winter 2023
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作者 Anastasia J.TOMANEK David E.MIKOLAJCZYK +7 位作者 Matthew A.LAZZARA Stefano DI BATTISTA Minghu DING Mariana FONTOLAN LITELL David H.BROMWICH Taylor P.NORTON Linda M.KELLER Lee J.WELHOUSE 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2024年第10期1873-1880,共8页
Extreme cold temperatures were observed in July and August 2023,coinciding with the WINFLY(winter fly-in)period of mid to late August into September 2023,meaning aircraft operations into McMurdo Station and Phoenix Ai... Extreme cold temperatures were observed in July and August 2023,coinciding with the WINFLY(winter fly-in)period of mid to late August into September 2023,meaning aircraft operations into McMurdo Station and Phoenix Airfield were adversely impacted.Specifically,with temperatures below−50℃,safe flight operation was not possible because of the risk of failing hydraulics and fuel turning to gel onboard the aircraft.The cold temperatures were measured across a broad area of the Antarctic,from East Antarctica toward the Ross Ice Shelf,and stretching across West Antarctica to the Antarctic Peninsula.A review of automatic weather station measurements and staffed station observations revealed a series of sites recording new record low temperatures.Four separate cold phases were identified,each a few days in duration and occurring from mid-July to the end of August 2023.A brief analysis of 500-hPa geopotential height anomalies shows how the mid-tropospheric atmospheric environment evolves in relation to these extreme cold temperatures.The monthly 500-hPa geopotential height anomalies show strong negative anomalies in August.Examination of composite geopotential height anomalies during each of the four cold phases suggests various factors leading to cold temperatures,including both southerly off-content flow and calm atmospheric conditions.Understanding the atmospheric environment that leads to such extreme cold temperatures can improve prediction of such events and benefit Antarctic operations and the study of Antarctic meteorology and climatology. 展开更多
关键词 ANTARCTICA extreme cold temperature automatic weather station networks
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Melatonin mitigates cold-induced damage to pepper seedlings by promoting redox homeostasis and regulating antioxidant profiling
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作者 Muhammad Ahsan Altaf Yuanyuan Hao +9 位作者 Huangying Shu Weiheng Jin Chuhao Chen Lin Li Yu Zhang Muhammad Ali Mumtaz Huizhen Fu Shanhan Cheng Guopeng Zhu Zhiwei Wang 《Horticultural Plant Journal》 SCIE CAS CSCD 2024年第2期532-544,共13页
This study assessed the influence of exogenous ME in the mitigation of cold damage in pepper seedlings. Melatonin(ME) is a dynamic molecule that helps plants cope with stress in several ways. Cold stress(CS) is one of... This study assessed the influence of exogenous ME in the mitigation of cold damage in pepper seedlings. Melatonin(ME) is a dynamic molecule that helps plants cope with stress in several ways. Cold stress(CS) is one of the most important environmental factors that restrict plant growth and yield. Pepper(Capsicum annuum L.) is a valuable commercial crop, highly sensitive to CS. Thus, identifying an efficient strategy to mitigate cold damage is critical for long-term pepper production. For this purpose, the roots of pepper seedlings were pretreated with ME(5 μmol · L^(-1)) and exposed to CS for 7 d. The results indicated that CS suppressed pepper growth, hampered photosynthetic capacity, and damaged root architecture in pepper plants. In contrast, the production of reactive oxygen species(ROS), malondialdehyde(MDA), electrolyte leakage(EL), proline, and soluble sugars were enhanced in plants under CS. ME(5 μmol · L^(-1)) pretreatment reduced the negative effects of CS by recovering plant growth, root traits, gas exchange elements, and pigment molecules compared to CS control treatment. Furthermore, ME application efficiently reduced oxidative stress markers [hydrogen peroxide(H_(2)O_(2)), superoxide ion(O_(2)^(·-)), EL, and MDA] while increasing proline and soluble sugar content in pepper leaves. ME application combined with CS further increased antioxidant enzymes and related gene expression. Collectively, our results confirmed the mitigating potential of ME supplementation for CS by maintaining pepper seedling growth,improving the photosynthesis apparatus, regulating pigments, and osmolyte content. 展开更多
关键词 PEPPER MELATONIN cold stress Antioxidant enzyme Root trait
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Dietary fat supplementation relieves cold temperature-induced energy stress through AMPK-mediated mitochondrial homeostasis in pigs
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作者 Wei He Xinyu Liu +4 位作者 Ye Feng Hongwei Ding Haoyang Sun Zhongyu Li Baoming Shi 《Journal of Animal Science and Biotechnology》 SCIE CAS CSCD 2024年第4期1669-1687,共19页
Background Cold stress has negative effects on the growth and health of mammals, and has become a factor restricting livestock development at high latitudes and on plateaus. The gut-liver axis is central to energy met... Background Cold stress has negative effects on the growth and health of mammals, and has become a factor restricting livestock development at high latitudes and on plateaus. The gut-liver axis is central to energy metabolism, and the mechanisms by which it regulates host energy metabolism at cold temperatures have rarely been illustrated. In this study, we evaluated the status of glycolipid metabolism and oxidative stress in pigs based on the gut-liver axis and propose that AMP-activated protein kinase(AMPK) is a key target for alleviating energy stress at cold temperatures by dietary fat supplementation.Results Dietary fat supplementation alleviated the negative effects of cold temperatures on growth performance and digestive enzymes, while hormonal homeostasis was also restored. Moreover, cold temperature exposure increased glucose transport in the jejunum. In contrast, we observed abnormalities in lipid metabolism, which was characterized by the accumulation of bile acids in the ileum and plasma. In addition, the results of the ileal metabolomic analysis were consistent with the energy metabolism measurements in the jejunum, and dietary fat supplementation increased the activity of the mitochondrial respiratory chain and lipid metabolism. As the central nexus of energy metabolism, the state of glycolipid metabolism and oxidative stress in the liver are inconsistent with that in the small intestine. Specifically, we found that cold temperature exposure increased glucose transport in the liver, which fully validates the idea that hormones can act on the liver to regulate glucose output. Additionally, dietary fat supplementation inhibited glucose transport and glycolysis, but increased gluconeogenesis, bile acid cycling, and lipid metabolism. Sustained activation of AMPK, which an energy receptor and regulator, leads to oxidative stress and apoptosis in the liver;dietary fat supplementation alleviates energy stress by reducing AMPK phosphorylation.Conclusions Cold stress reduced the growth performance and aggravated glycolipid metabolism disorders and oxidative stress damage in pigs. Dietary fat supplementation improved growth performance and alleviated cold temperature-induced energy stress through AMPK-mediated mitochondrial homeostasis. In this study, we high-light the importance of AMPK in dietary fat supplementation-mediated alleviation of host energy stress in response to environmental changes. 展开更多
关键词 Apoptosis cold temperature Energy stress FAT Glucolipid metabolism Mitochondrial homeostasis
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