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Future soil moisture will slowdown the advancement of ecosystem productivity in the Northern Hemisphere

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Science Bulletin 2025年第3期70卷 347-350页

作者： Zhi Li Yongchang Liu Yaning Chen Lei Gao Wenping Yuan Brett A.Bryan Bin He Weili duan Gonghuan Fang Yupeng Li Xueqi Zhang State Key Laboratory of Desert and Oasis Ecology Key Laboratory of Ecological Safety and Sustainable Development in Arid LandsXinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China University of the Chinese Academy of Sciences Beijing 100049China Commonwealth Scientific and Industrial Research Organisation(CSIRO) UrrbraeSA 5064Australia School of Atmospheric Sciences Sun Yat-sen UniversityZhuhai 510245China Centre for Integrative Ecology School of Life and Environmental SciencesDeakin UniversityBurwoodVIC 3125Australia State Key Laboratory of Earth Surface Processes and Resource Ecology Faculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China

Gross primary productivity(GPP)is a crucial metric when quantifying the amount of CO_(2)sequestered by plants during *** large terrestrial carbon sink in the Northern Hemisphere is primarily attributed to elevated GPP... 详细信息

关键词： soil moisture attributed

猪PFN1基因在骨骼肌组织中的表达模式及多态性研究

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家畜生态学报 2023年第11期44卷 10-15页

作者：李新荻王宇卢鸿罗布白珍何辰庆段梦琪叶幼荣张健商鹏西藏农牧学院动物科学学院西藏林芝860000 西藏特色农牧资源研发省部共建协同创新中心西藏林芝860000 林芝市巴宜区畜牧兽医总站西藏林芝860000

为探究猪前纤维蛋白1(Profilin-1,PFN1)基因多态性及其在猪骨骼肌组织中的mRNA表达规律,以藏猪(Tibet pigs, TP)和大约克猪(Yorkshire pigs, YP)作为试验动物,采用Sanger测序技术对PFN1基因CDS区、5’UTR启动子区进行单核苷酸多态性(Sin... 详细信息

为探究猪前纤维蛋白1(Profilin-1,PFN1)基因多态性及其在猪骨骼肌组织中的mRNA表达规律,以藏猪(Tibet pigs, TP)和大约克猪(Yorkshire pigs, YP)作为试验动物,采用Sanger测序技术对PFN1基因CDS区、5’UTR启动子区进行单核苷酸多态性(Single nucleotide polymorphism, SNP)的筛选与基因分型,预测分析了PFN1基因的SNPs位点突变前后转录因子的功能特性;采用RT-qPCR技术检测PFN1基因在30、90、180日龄三个时期TP和YP的腿肌与背最长肌中的mRNA表达量。结果表明:PFN1基因启动子区域存在三个SNPs,且TP与YP基因频率差异显著;产生了8个新增转录因子结合位点,这些位点调控骨骼肌生长发育、细胞形态建成和保持等过程;PFN1基因表达水平于30日龄时最高,随日龄的增加而下降,90、180日龄时TP的PFN1基因表达量均显著(P<0.05)或极显著(P<0.01)低于YP。综上表明,猪PFN1基因SNPs位点多态性与骨骼肌mRNA的差异表达相关,推测PFN1基因对猪早期骨骼肌生长发育与肌纤维细胞形态保持起重要的调控作用,本研究结果为后续进一步探索其分子作用机制奠定基础。

关键词：藏猪 PFN1基因单核苷酸多态性骨骼肌 mRNA表达

Designing the counter pressure casting gating system for a large thin-walled cabin by machine learning

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China Foundry 2025年

作者： Xiao-long Zhang Hua Hou Xiao-long Pei Zhi-qiang duan Yu-hong Zhao School of Materials Science and Engineering Collaborative Innovation Center of Ministry of Education and Shanxi Province for High-performance Al/Mg Alloy Materials North University of China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology Beijing Institute of Materials Intelligent Technology Liaoning Academy of Materials

The design of casting gating system directly determines the solidification sequence, defect severity,and overall quality of the casting. A novel machine learning strategy was developed to design the counter pressure casting gating system of a large thin-walled cabin casting. A high-quality dataset was established through orthogonal experiments combined with design criteria for the gating system. Spearman's correlation analysis was used to select high-quality features. The gating system dimensions were predicted using a gated recurrent unit(GRU) recurrent neural network and an elastic network model. Using EasyCast and ProCAST casting software, a comparative analysis of the flow field, temperature field, and solidification field can be conducted to demonstrate the achievement of steady filling and top-down sequential solidification. Compared to the empirical formula method, this method eliminates trial-and-error iterations, reduces porosity, reduces casting defect volume from 11.23 cubic centimeters to 2.23 cubic centimeters, eliminates internal casting defects through the incorporation of an internally cooled iron, fulfilling the goal of intelligent gating system design.

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Spin-modulated near-infrared-Ⅰ emission in a xanthene-decorated Fe(Ⅱ) spin-crossover complex

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Science China Chemistry 2025年

作者： Cheng Yi Duyong Chen Shihui Zhang Rui Cai Chunying duan Yinshan Meng Tao Liu State Key Laboratory of Fine Chemicals Frontier Science Center for Smart Materials and Chemical Engineering School of Chemical Engineering Dalian University of Technology Instrumental Analysis Center Dalian University of Technology School of Chemistry Dalian University of Technology Liaoning Binhai Laboratory

Molecular materials showing synergetic coupling of near-infrared （NIR） fluorescence and spin-crossover （SCO） are promisingly applicable in in-vivo bioimaging,temperature sensing,and spintronic *** the related study faces formidable *** this work we graft the NIR fluorophore xanthene onto the dipyridyl substituted triazole ligand and construct a new Febased SCO material,{FeⅡ（ddxc-abpt）2[N（CN）2]2}(1,ddxc-abpt:（E）-4-(((3,5-di（pyridin-2-yl）-4H-1,2,4-triazol-4-yl)imino)methyl)-N,N-diethyl-2,3-dihydro-1H-xanthen-6-amine).Magnetic studies indicate that compound 1 exhibits thermally induced SCO property in both the solid and solution ***-temperature fluorescence emission spectra reveal a remarkable 7-fold increase in photoluminescence intensity upon the transition from the low-spin state at 110 K to the high-spin state at 280 K,which is the record of all reported coupled fluorescence-SCO ***-temperature ultraviolet-visible （UV-Vis）absorption spectra show a significant change in absorption intensity within the fluorescence emission window,consistent with the F?rster resonance energy transfer （FRET） ***-dependent density functional theory （TD-DFT） calculations demonstrate that the strong coupling is attributed to disrupted energy transfer between the xanthene fluorophore and high-spin *** work provides a feasible approach for expanding the synergetic SCO-fluorescence materials to the NIR-Iwavelength region,and hopefully contributes to the applications of tunable NIR-SCO molecule-based sensors and devices.

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Graphene oxide wrapped-silica microspheres humidity sensor with fast response/recovery,high sensitivity,and selectivity for pig respiratory rate monitoring

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Science China(Technological Sciences) 2025年第2期68卷 86-96页

作者： Jing LI Bo LI Ziqi LIAO Yunhui duan Xinglan FU Yuehua HUANG Guanglin LI College of Engineering and Technology Southwest UniversityChongqing 400715China Modern Agricultural Equipment Research Institute Xihua UniversityChengdu 610039China

Respiratory rate monitoring is of great significance in pig healthy breeding for the early detection and timely prevention of respiratory *** sensing is an important noncontact method to monitor pig respiration,which does not cause direct harm to pigs and meets the requirements of animal *** paper proposes a humidity sensor based on graphene oxide wrapped-silica microspheres(GO@SiO_(2)).First,the sensor shows fast response/recovery performances of 0.24/0.73 *** demonstrate that the wrapped microsphere structure can inhibit water *** is speculated that the wrapped microsphere structure can inhibit the stacking of GO,and its curved surface can promote the evaporation of water ***,the sensor shows a high sensitivity of 1.2%/%RH-4.2%/%RH in 11%-95%RH *** can be attributed to different sensing mechanisms,from hopping transport to increasing ion transport,leading to a significant change in the sensor’s ***,the sensor shows selectivity to water molecules due to the hydrophilic characteristic of GO and the significant increase in conductivity by ion ***,the sensor is applied to realize the respiratory rate monitoring of adult pigs and piglets.

关键词： pig respiratory monitoring GO@SiO_(2)humidity sensor fast response/recovery high sensitivity selectivity

深入学习贯彻习近平主席重要贺信精神持续推进国际中文教育事业创新发展

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世界汉语教学 2025年第1期39卷 3-8页

作者：段鹏北京语言大学

国际中文教育的可持续、高质量发展是新时代新征程的重大课题。国际中文教育要“坚持守正创新,加强联通融合”,坚守好国际中文教育本身的教育属性、承载的文化属性和担负的事业属性,把服务中国式现代化建设、满足世界各国的最新需求和... 详细信息

国际中文教育的可持续、高质量发展是新时代新征程的重大课题。国际中文教育要“坚持守正创新,加强联通融合”,坚守好国际中文教育本身的教育属性、承载的文化属性和担负的事业属性,把服务中国式现代化建设、满足世界各国的最新需求和融合开放的新型思维作为创新的基本原则,加强国际中文教育平台、主体和资源的联通,促进国际中文教育学科专业、语言文化及与现代信息技术的融合,提升国际传播能力,强化文明交流互鉴,为人类命运共同体建设贡献力量。

关键词：国际中文教育守正创新联通融合

Hydrogen-enhanced light-induced thermoelastic spectroscopy sensing

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Photonics Research 2025年第1期13卷 194-200页

作者： YING HE YUANZHI WANG SHUNDA QIAO XIAOMING duan HONG QI YUFEI MA National Key Laboratory of Laser Spatial Information Harbin Institute of Technology School of Energy Science and Engineering Harbin Institute of Technology

A hydrogen（）-enhanced light-induced thermoelastic spectroscopy（LITES） sensor is proposed for the first time, to our knowledge, in this paper. The enhancement with H2significantly reduces the resonance damping of a quartz tuning fork（QTF）, leading to a 2.5-fold improvement in the quality factor（Q-factor） to 30,000 without introducing additional noise into the LITES sensor system. Based on the H2-enhancement effect, a self-designed round-head QTF with a low resonance frequency（f0） of 9527 Hz and a fiber coupled multipass cell（MPC）with an optical length of 40 m were utilized to increase the energy accumulation time of QTF and the optical absorption of the target gas, respectively, to demonstrate an ultra-highly sensitive C2H2-LITES sensor. The longterm stability of the H2-enhanced C2H2-LITES sensor was investigated based on Allan deviation analysis. With an optimal integration time of 140 s, the minimum detection limit（MDL） was improved to 290 parts per trillion（ppt）. Compared to other reported state-of-the-art C2H2-LITES techniques with similar parameters, this sensor shows a 241-fold improvement in the MDL. This H2-enhancement technique proves to be a highly effective method for achieving a high Q-factor QTF, characterized by its simplicity and efficiency. It offers substantial potential for applications in QTF-based gas sensing.

关键词： High power lasers Hydrogen Optical absorption Photoacoustic effect Photoacoustic spectroscopy Sensor performance

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藏马微卫星标记遗传多样性研究

中国农业大学学报 2019年第9期24卷 98-104页

作者：商鹏郭新颖张健吴绿草段梦琪杨娜娜赵雨农李盼强巴央宗西藏农牧学院动物科学学院西藏林芝860000 林芝市农牧局畜牧兽医总站西藏林芝860000

为研究西藏藏马种群的微卫星多态性,应用生物素标记的微卫星探针与藏马基因组酶切片段杂交,通过链霉亲和素包被的磁珠捕获150~1 000 bp含有微卫星序列的DNA片段,连接到pEASY-T1载体中,构建藏马基因组微卫星富集文库。结果表明:从2 380... 详细信息

为研究西藏藏马种群的微卫星多态性,应用生物素标记的微卫星探针与藏马基因组酶切片段杂交,通过链霉亲和素包被的磁珠捕获150~1 000 bp含有微卫星序列的DNA片段,连接到pEASY-T1载体中,构建藏马基因组微卫星富集文库。结果表明:从2 380个转化子中随机挑取112个阳性克隆进行测序后,经筛选比对发现,从62个微卫星中筛选出39个在马属基因组卫星库中未被检测到的微卫星;成功设计了10对藏马微卫星引物,经聚合酶链式反应-单链构象多态性(PCR-SSCP)方法检测到3个具有多态性的微卫星标记,其中有2个多态性信息含量(PIC)值均大于0.5。因此,这3个微卫星标记可应用于藏马遗传多态性检测、种群遗传结构等方面研究,为藏马遗传连锁图谱的构建、辅助育种、群体遗传学分析、基因组结构分析以及分子进化研究等提供依据。

关键词：藏马微卫星标记遗传多样性

藏猪和大约克猪MYL1基因多态性及差异表达分析

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基因组学与应用生物学 2021年第2期40卷 526-530页

作者：巩兴龙段梦琪张健李雨晴张芳芳赵雪强巴央宗商鹏西藏农牧学院动物科学学院林芝860000 黑龙江省大庆市杜尔伯特蒙古族自治县一心乡畜牧水产中心大庆163000

为研究猪不同品种的MYL1基因的多态性及mRNA表达差异。本试验以藏猪和大约克猪作为实验动物,采用一代测序技术对藏猪(59头)和大约克猪(58头)MYL1基因起始密码子上游3 kb区域进行多态性检测;利用实时荧光定量PCR技术检测MYL1基因在背最... 详细信息

为研究猪不同品种的MYL1基因的多态性及mRNA表达差异。本试验以藏猪和大约克猪作为实验动物,采用一代测序技术对藏猪(59头)和大约克猪(58头)MYL1基因起始密码子上游3 kb区域进行多态性检测;利用实时荧光定量PCR技术检测MYL1基因在背最长肌、背脂、肝脏组织差异表达情况。结果表明:藏猪和大约克猪在起始密码子上游3 kb区域发现T-159A突变位点并呈极显著差异(P<0.01);MYL1基因在背最长肌表达量最高,其次是背脂,肝脏的最低,在背最长肌中藏猪MYL1基因表达量极显著高于大约克猪(P<0.01),在背脂和肝脏组织中,藏猪MYL1基因表达量显著高于大约克猪(P<0.05)。推测T-159A位点可能是参与肌肉生长发育的重要调控位点。本研究为下一步开展MYL1基因对猪生长性能及其肉品质的影响提供参考依据。

关键词：藏猪大约克猪 MYL1 多态性基因表达