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Enhanced thermal constant B of diamond films for ultrahigh sensitivity negative temperature coefficient thermistors

Science China Materials 2024年第10期67卷 3321-3329页

作者： Qiao Chen yimeng zhao Jiawei Li Xiyuan Liu Xinyue Wang Wenxi Zhang Hongwei Zhu Gemmological Institute China University of GeosciencesWuhan 430074China Shenzhen Research Institute China University of GeosciencesShenzhen 518057China State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Southwest United Graduate School Kunming 650500China

Negative temperature coefficient(NTC)thermistor plays a crucial role in science research and engineering applications for precise temperature *** great progress has been achieved in NTC materials,enhancing sensitivity and maintaining this high sensitivity along with linearity across extensive temperature ranges remain a significant *** this study,we introduce a diamondbased thermistor(DT)characterized by its outstanding sensitivity,swift response time,and broad temperature monitoring *** temperature constant B for this DT,measured from 30 to 300°C(B30/300),achieves an exceptional value of 8012 K,which notably exceeds the temperature sensing capabilities of previously reported NTC thermistors within this extensive ***,diamond’s unique thermal conductivity and stability significantly boost the response speed and durability of the DT,offering substantial advantages over traditional ceramic *** enhanced temperature-sensitive properties of the DT are attributed to the presence of impurity elements in polycrystalline *** analysis indicates a hopping conduction mechanism,likely involving C-H or C-N dipoles at the diamond grain *** study marks a significant leap forward in diamond thermistor technology and sheds light on the mechanisms of thermal active conduction in diamond materials.

关键词： polycrystalline diamond thermistors negative temperature coefficient hopping conduction grain boundary

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氨磷汀通过调节肠道菌群对急性辐射损伤的防护作用机制

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中国药房 2024年第4期35卷 459-463页

作者：丛悦李莉赵艺萌徐媛媛拱健婷关佳莉首都医科大学附属北京中医医院北京市中医药研究所北京100010

目的探究氨磷汀对急性辐射损伤小鼠的防护作用机制。方法30只C57BL/6J小鼠随机分成正常对照组、模型组和氨磷汀组(150 mg/kg),每组10只。照射前30 min氨磷汀组小鼠腹腔注射氨磷汀,正常对照组和模型组小鼠腹腔注射等体积生理盐水,然后模... 详细信息

目的探究氨磷汀对急性辐射损伤小鼠的防护作用机制。方法30只C57BL/6J小鼠随机分成正常对照组、模型组和氨磷汀组(150 mg/kg),每组10只。照射前30 min氨磷汀组小鼠腹腔注射氨磷汀,正常对照组和模型组小鼠腹腔注射等体积生理盐水,然后模型组和氨磷汀组小鼠予4 Gy X射线一次性全身照射致急性辐射损伤。检测照射前2 h和照射后第1、4、7、10、14天小鼠外周血中白细胞、血小板和红细胞计数,分析照射后第7天各类白细胞(中性粒细胞、淋巴细胞、单核细胞)的比例变化;采用16S rRNA扩增子测序技术分析照射后第7天小鼠粪便中肠道菌群结构,并与各类白细胞进行相关性分析。结果氨磷汀组小鼠白细胞计数在照射后第1、4、7、10天,血小板计数在照射后第10天,红细胞计数在照射后第1天均显著高于模型组(P<0.05)。与正常对照组比较,模型组小鼠肠道菌群β多样性发生改变,厚壁菌门相对丰度升高,拟杆菌门相对丰度降低;氨磷汀逆转了上述肠道菌群β多样性以及拟杆菌门和厚壁菌门相对丰度的变化。模型组有异芽孢杆菌属、丹毒丝菌纲、丹毒丝菌目和丹毒丝菌科4个差异性物种,其丰度与外周血淋巴细胞比例呈显著负相关(P<0.01),氨磷汀组有小鼠乳杆菌和卷曲乳杆菌2个差异性物种,其丰度与中性粒细胞比例呈显著负相关(P<0.05)。结论氨磷汀可通过维持肠道微生物菌群平衡来减轻辐射造成的急性损伤。

关键词：急性辐射损伤氨磷汀肠道微生物 16S rRNA序列测序

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Two Dimension C_3N_4/MoS_2 Nanocomposites with Enhanced Photocatalytic Hydrogen Evolution under Visible Light Irradiation

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Journal of Wuhan University of Technology(Materials Science) 2019年第1期34卷 23-29页

作者： CUI Yanjuan YANG Chuanfeng TANG Sheng zhao yimeng CHEN Fangyan School of Environmental and Chemical Engineering Jiangsu University of Science and Technology

MoS_2-decorated C_3N_4(C_3N_4/MoS_2) nanosheets hybrid photocatalysts were prepared by a simple sonication-impregnation method. Face-to-face lamellar heterojunctions were well established between two dimension(2D) C_3N_4 and MoS_2 nanosheets. The effects of MoS_2 content on the light absorption, charge transfer and photocatalytic activity of the hybrid samples were investigated. Characterization results show that MoS_2 nanosheets are well anchored on the face of C_3N_4 nanosheets and the composites have well dispersed layered morphology. After loading with MoS_2, the light absorption of composites was much improved, especially in visible-light region. The photocatalytic activities of C_3N_4/MoS_2 samples were evaluated based on the H_2 evolution under visible light irradiation(λ > 400 nm). When the loading amount of MoS_2 was increased to 5 wt%, the highest H_2 evolution rate(274 μmol·g^(-1)·h^(-1)) was obtained. Compared with samples obtained from direct impregnation method, sonication pretreatment is favorable for the formation of 2D layered heterojuctions and thus improve the photocatalytic activity. Slightly deactivation of C_3N_4/MoS_2 composites could be observed when recycled due to the mild photocorrosion of MoS_2. Based on the band alignments of C_3N_4 and MoS_2, a possible photocatalytic mechanism was discussed, where MoS_2 could efficiently promote the separation of the photogenerated carriers of C_3N_4.

关键词： C3N4/MoS2 nanosheet heterojunction photocatalytic activity H2 evolution

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Balancing benefits of strength,plasticity and glass-forming ability in Co-based metallic glasses

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Journal of Materials Science & Technology 2021年第27期86卷 110-116页

作者： yimeng zhao Xuan Li Xiaobin Liu Jiazi Bi Yang Wu Ruijuan Xiao Ran Li Tao Zhang Key Laboratory of Aerospace Materials and Performance(Ministry of Education) School of Materials Science and EngineeringBeihang UniversityBeijing 100191China Institute of Physics Chinese Academy of SciencesBeijing 100190China

Development of advanced metals materials with ultrahigh strength,large plasticity and high thermostability is one of the most attractive aims for materials ***-based bulk metallic glasses(BMGs)with the highest strength(up to 6 GPa)and special strength(up to 650 Nm/g)among all of metals materials so far we known have received extensive *** this paper,a family of Co-Ta-B-Si BMGs with high glass-transition temperature(above 870 K),large compressive plasticity(up to 6.4%)and high strength(above 5.5 GPa),and high glass-forming ability(the critical diameter,Dc:up to 4 mm)was developed by accurately tuning metalloid element contents of Si and B in the parental alloy of Co_(55)Ta_(10)B_(35).The changes of glass formation and plasticity caused by the adjustment of the constituent metalloid elements were evaluated by the combination of experimental and calculated *** reason for the significant improvement of plastic deformation is revealed by the analysis of the self-organization behaviors of high-density shear bands.

关键词： Metallic glass Glass formation Thermostability Strength Plasticity

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Microfluidic Actuated and Controlled Systems and Application for Lab-on-Chip in Space Life Science

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Space(Science & Technology) 2023年第1期3卷 54-70页

作者： yimeng zhao Xuefei Lv Xiaoqiong Li Nino Rcheulishvili Yu Chen Zhe Li Yulin Deng Beijing Key Laboratory for Separation and Analysis in Biomedicine and Pharmaceuticals School of Life ScienceBeijing Institute of TechnologyBeijing 100081China

The use of space environment to carry out life science research is of great ***,there are limitations in complex manipulation,research models based on mammalian and 2-dimensional cell culture experiments,*** chips possess the characteristics of integrating the relevant functions of traditional laboratories into micron-scale chips,with low energy consumption,high throughput,and *** application of microfluidic chips can overcome the challenges of space environments,the scarce experimental resources,and the unmanned operation problems to some ***,microfluidic chips can realize long-term experimental operation and remote data recording and *** carry out related research with microfluidic chips,the actuation and control of microfluidics are very *** this paper,the microfluidic actuated and controlled technologies in microfluidic chips are reviewed,and then the application of microfluidic chips and microfluidic actuated and controlled systems in space life science is also briefly described.

关键词： fluid carry overcome

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黄精多糖对X射线辐射损伤小鼠外周血象及肠道菌群的影响研究

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现代中药研究与实践 2024年第1期38卷 24-29页

作者：丛悦李莉关佳莉拱健婷徐媛媛赵艺萌首都医科大学附属北京中医医院北京100010 北京市中医药研究所北京100010

目的探讨黄精多糖对X射线全身照射小鼠造血系统损伤和肠道菌群的作用。方法30只C57BL/6J小鼠随机分成正常对照组、照射对照组和黄精多糖给药组。分析照射前和照射后14 d内小鼠外周血白细胞、血小板和红细胞计数和不同分类白细胞百分比变... 详细信息

目的探讨黄精多糖对X射线全身照射小鼠造血系统损伤和肠道菌群的作用。方法30只C57BL/6J小鼠随机分成正常对照组、照射对照组和黄精多糖给药组。分析照射前和照射后14 d内小鼠外周血白细胞、血小板和红细胞计数和不同分类白细胞百分比变化;16S rRNA高通量测序分析照后7 d小鼠肠道菌群组成和结构。结果黄精多糖组外周血白细胞数在照射后第4、7、10天,红细胞数在第1、14天均明显高于照射对照组(P<0.05),黄精多糖增加了照射后小鼠淋巴细胞百分比,降低了中性粒细胞和单核细胞的百分比。各组小鼠肠道菌群α多样性无明显改变。β多样性分析显示肠道菌群结构发生改变。功能预测分析显示,黄精多糖组参与低聚木糖、核黄素、吲哚-3-甲醛等11种物质代谢的微生物丰度明显高于正常组和照射对照组。结论黄精多糖能有效保护辐射引起的造血损伤,改变辐射所致小鼠肠道菌群结构组成和功能,为开发新型天然产物辐射防护剂提供理论依据。

关键词：黄精多糖 X射线造血损伤肠道微生物辐射防护

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禽呼肠孤病毒在我国部分地区蛋鸡群中的血清流行率和风险因素分析

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中国兽医杂志 2024年第3期60卷 1-8页

作者：郑好杨霞张素赵一萌汤君宇高丽曹红马国明王占新郑世军王永强中国农业大学动物医学院兽医公共卫生安全全国重点实验室农业农村部动物流行病学重点实验室北京海淀100193 北农大科技股份有限公司北京海淀100193 温氏食品集团股份有限公司广东省畜禽健康养殖与环境控制企业重点实验室广东云浮527300

禽呼肠孤病毒(ARV)在我国流行范围较广,感染家禽后使其出现病毒性关节炎、生长不良和产蛋量下降等表现,对我国养禽业造成较严重的经济损失。为了解我国蛋鸡群中ARV的流行情况及存在的感染风险因素,本试验在2022年11月—2023年3月从北京... 详细信息

禽呼肠孤病毒(ARV)在我国流行范围较广,感染家禽后使其出现病毒性关节炎、生长不良和产蛋量下降等表现,对我国养禽业造成较严重的经济损失。为了解我国蛋鸡群中ARV的流行情况及存在的感染风险因素,本试验在2022年11月—2023年3月从北京、天津、河北、山东、河南、江苏、陕西、湖北和重庆9个省市的45个蛋鸡养殖场(其中包括祖代蛋鸡群、父母代蛋鸡群和商品代蛋鸡群),收集共计45份调查问卷和968份血清样本。采用酶联免疫吸附试验(ELISA)检测血清中的ARV抗体,并结合调查问卷,采用单因素分析和逻辑回归分析方法找到蛋鸡出现ARV感染症状的风险因素。ELISA检测结果显示,968份血清样本中检出阳性863份,阳性率为89.15%(95%CI:87.0%~91.0%);单因素分析结果显示,全进全出饲养模式下的蛋鸡出现ARV感染症状的概率显著低于区域性全进全出饲养模式或不同日龄、不同批次混养饲养模式下的蛋鸡,且具有较强程度的关联(P<0.05,0.1

关键词：蛋鸡禽呼肠孤病毒(ARV) 抗体检测风险因素

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Novel Cs-Mg-Al mixed oxide with improved mobility of oxygen species for passive NOx adsorption

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Green Energy & Environment 2024年第10期9卷 1581-1591页

作者： yimeng Yin Chizhong Wang Lei Qiu Xing Li Feilin zhao Jie Yu Jinchi Han Huazhen Chang School of Environment and Natural Resources Renmin University of China Department of Earth System Science Tsinghua University

The development of passive NOxadsorbers with cost-benefit and high NOxstorage capacity remains an on-going challenge to after-treatment technologies at lower temperatures associated with cold-start ***,Cs1Mg3Al catalyst prepared by sol±gel method was cyclic tested in NOxstorage under 5 vol%*** 100°C,the NOxstorage capacity (1219μmol g-1) was much higher than that of Pt/Ba O/Al2O3(610μmol g-1).This provided new insights for non-noble metal catalysts in low-temperature passive *** addition of Cs improved the mobility of oxygen species and thus improved the NOxstorage *** XRD,XPS,IR spectra and in situ DRIFTs with NH3probe showed an interaction between CsOxand AlOxsites via oxygen species formed on Cs1Mg3Al *** improved mobility of oxygen species inferred from O2-TPD was consistent with high NOxstorage capacity related to enhanced formation of nitrate and additional nitrite species by ***,the addition of Mg might improve the stability of Cs1Mg3Al by stabilizing surface active oxygen species in cyclic experiments.

关键词： Passive NO x adsorber Low-temperature NO x storage Cesium Oxygen mobility

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Geological and geochemical characteristics of the Baogudi Carlintype gold district(Southwest Guizhou, China) and their geological implications

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Acta Geochimica 2019年第4期38卷 587-609页

作者： Songtao Li Yong Xia Jianzhong Liu Zhuojun Xie Qinping Tan yimeng zhao Minghua Meng Lijin Tan Rong Nie Zepeng Wang Guanghong Zhou Haiyan Guo State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China University of Chinese Academy of Sciences Beijing 100049China No.105 Geological Team Guizhou Bureau of Geology and Mineral Exploration and DevelopmentGuiyang 550018China Bureau of Geology and Mineral Exploration and Development Guizhou Province Guiyang 550004China Guizhou Education University Guiyang 550018China School of Pharmacy Chengdu University of Traditional Chinese MedicineChengdu 611137China

The newly discovered Baogudi gold district is located in the southwestern Guizhou Province,China,where there are numerous Carlin-type gold *** better understand the geological and geochemical characteristics of the Baogudi gold district,we carried out petrographic observations,elemental analyses,and fluid inclusion and isotopic composition *** also compared the results with those of typical Carlin-type gold deposits in southwestern *** mineralization stages,namely,the sedimentation diagenesis,hydrothermal(main-ore and late-ore substages),and supergene stages,were identified based on field and petrographic *** main-ore and late-ore stages correspond to Au and Sb mineralization,respectively,which are similar to typical Carlin-type *** mass transfer associated with alteration and mineralization shows that a significant amount of Au,As,Sb,Hg,Tl,Mo,and S were added to mineralized rocks during the main-ore ***,arsenic,Sb,and S were added to the mineralized rocks during the late-ore *** migration indicates that the sulfidation process was responsible for ore *** types of fluid inclusions were identified in ore-related quartz and *** main-ore stage fluids are characterized by an H2O–NaCl–CO2–CH4±N2system,with medium to low temperatures(180–260℃)and low salinity(0–9.08%NaCl equivalent).The late-ore stage fluids featured H2O–NaCl±CO2±CH4,with low temperature(120–200℃)and low salinity(0–7.48%Na Cl equivalent).The temperature,salinity,and CO2and CH4concentrations of ore-forming fluids decreased from the main-ore stage to the late-ore *** calculated δ^13C,d D,and δ^18O values of the ore-forming fluids range from-14.3 to-7.0%,-76 to-55.7%,and 4.5–15.0%,***-ore-stage stibnite had δ^34S values ranging from-0.6 to 1.9%.These stable isotopic compositions indicate that the ore-forming fluids originated mainly from deep magmatic hydrothermal fluids,with minor contribution

关键词： Elemental geochemistry Fluid inclusions Stable isotopes Carlin-type gold deposits Baogudi gold district Southwestern Guizhou

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区域创新空间战略与江苏沿江地区新型工业化发展研究

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科学学与科学技术管理 2005年第12期26卷 113-116页

作者：赵沂蒙南京大学商学院江苏南京210093

分析了江苏沿江地区区域创新空间战略的内在结构,从制造业运行过程优化、产业环境协调能力优化、区域发展空间一体化能力升级等角度研究区域创新空间战略对沿江地区新型工业化发展的作用。

关键词：区域创新空间战略沿江地区新型工业化

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