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Online preparation of high-quality BN coatings with atomic diffusion based on carbon-free water-soluble precursor

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Journal of Advanced Ceramics 2024年第3期13卷 272-281页

作者： Yiang Du Bing Wang Yunbo zhang Quzhi Song Fuwen Wang Cheng Han xiaoshan zhang Yingde Wang Science and Technology on Advanced Ceramic Fibers and Composites Laboratory College of Aerospace Science and EngineeringNational University of Defense TechnologyChangsha 410073China

Efficient and environmentally friendly production of high-quality continuous fiber coatings using current preparation methods is highly challenging due to issues such as scale and batch processing restrictions,low deposition rate,high energy consumption,and utilization of multiple environmentally hazardous *** address these challenges,we propose a stable and efficient wet chemical deposition coating method for high-throughput online continuous preparation of boron nitride(BN)coatings on ceramic fibers under an ambient *** process involves surface modification,in-situ wet chemical deposition,and heat treatment,and all seamlessly connecting with the ceramic fiber preparation process through continuous *** groups were introduced via surface modification enhancing wettability of the fiber surface with impregnating *** in-situ reaction and atom migration improve uniformity and binding of the *** a result,outstanding impregnation and adhesion properties are achieved.A comprehensive analysis to evaluate the impact of the BN coatings was conducted,which demonstrates that the BN-coated fibers exhibit a remarkable 36%increase in tensile strength,a 133%increase in fracture toughness,and enhanced temperature resistance of up to 1600℃.It provides a secure and efficient platform for cost-effective production of functional and high-quality coatings through targeted surface modification and rapid stretching impregnation.

关键词： polymer-derived ceramics SiC fibers wet chemical deposition atomic diffusion boron nitride(BN)coatings

Species profile and reactivity of volatile organic compounds emission in solvent uses,industry activities and from vehicular tunnels

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Journal of Environmental Sciences 2024年第1期135卷 546-559页

作者： Haimei Huang zhangwei Wang Chunhao Dai Hai Wu Jia Guo Chunjie Wang xiaoshan zhang State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Hunan Agricultural University Changsha 430106China National Institute of Metrology Beijing 100029China

A survey was conducted of the volatile organic compounds(VOCs)released from sources of solvent use,industry activities and vehicle emissions in Guiyang,a capital city of *** were collected by canisters and analyzed by *** species profiles of VOCs emitted from sources were *** showed that xylenes,ethylbenzene,acetone and dichloromethane were the characteristics species for painting,2-propanol and ethyl acetate for printing,α-pinene for solid wood furniture manufacturing,and 2-butanone for biscuit *** characteristics species could be as tracers for the sources *** most of samples from the solvent use,the benzene/toluene(B/T)ratio was less than 0.3,indicating that the ratio could be as the indicator for tracing the solvent use related *** results also suggested that the toluene/xylene(T/X)ratio be as the indicator to distinguish the VOCs sources of painting(2).Aromatics contributed the most to ozone formation potential(OFP)of most painting and non-paper printing sources,and oxygen-containing VOCs(OVOCs)were major species contributing to OFP of the sources from food production and paper *** OFP of the VOCs emissions from vehicle in tunnels and from other manufactures were dominated by both aromatics and ***α-pinene could explain 56.94%and 32.54%of total OFP of the VOCs sources from filing cabinet and solid wood furniture manufacturing,which was rarely been involved in previous studies of VOCs source profiles,indicating that the species of concern for VOCs sources are still insufficient at present.

关键词： Volatile organic compounds(VOCs) Species profile BTEX ratio Source reactivity

Development of an Integrated Disposable Device for SARSCoV-2 Nucleic Acid Extraction and Detection

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Biomedical and Environmental Sciences 2024年第6期37卷 639-646页

作者： Jing Ma Yanzhe Hao Meiling Hou xiaoshan zhang Jingduan Liu Haodi Meng Jiangbo Chang Xuejun Ma Jihua Liu Qingjie Ying Xianhua Wang Hongxia Li Yuxi Cao Xiaoguang zhang National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases National Institute for Viral Disease Control and PreventionChinese Center for Disease Control and PreventionBeijing 102206China Beijing Runbio Biotechnology Development Co. LtdBeijing 100106China Beijing Beta Technology Co. LtdBeijing 101318China Jiangsu Qitian Gene Biotechnology Co. LtdWuxi 214135JiangsuChina

Objective To develop a highly sensitive and rapid nucleic acid detection method for the severe acute respiratory syndrome coronavirus 2(SARS-CoV-2).Methods We designed,developed,and manufactured an integrated disposable device for SARS-CoV-2 nucleic acid extraction and *** precision of the liquid transfer and temperature control was tested.A comparison between our device and a commercial kit for SARS-Cov-2 nucleic acid extraction was performed using real-time fluorescence reverse transcription polymerase chain reaction(RT-PCR).The entire process,from SARS-CoV-2 nucleic acid extraction to amplification,was *** The precision of the syringe transfer volume was 19.2±1.9μL(set value was 20),32.2±1.6(set value was 30),and 57.2±3.5(set value was 60).Temperature control in the amplification tube was measured at 60.0±0.0℃(set value was 60)and 95.1±0.2℃(set value was 95)***-Cov-2 nucleic acid extraction yield through the device was 7.10×10^(6) copies/mL,while a commercial kit yielded 2.98×10^(6) copies/*** mean time to complete the entire assay,from SARS-CoV-2 nucleic acid extraction to amplification detection,was 36 min and 45 *** detection limit for SARS-CoV-2 nucleic acid was 250 copies/*** The integrated disposable devices may be used for SARS-CoV-2 Point-of-Care test(POCT).

关键词： An integrated disposable device SARS-Cov-2 Nucleic acid detection

耐高温SiO_(2)/ZrO_(2)纳米纤维膜的力学和隔热性能

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材料研究学报 2024年第5期38卷 365-372页

作者：徐汇张培垣徐娜娜刘涛张晓山王兵王应德国防科技大学空天科学学院、新型陶瓷纤维及其复合材料重点实验室长沙410073

将静电纺丝技术与先驱体转化法相结合,制备出耐高温(1300℃)性能较好的SiO_(2)/ZrO_(2)纳米纤维膜。这种SiO_(2)/ZrO_(2)-0.5纳米纤维由无定形SiO_(2)相和t-ZrO_(2)纳米晶组成,其平均直径为495.8±45.5 nm。SiO_(2)/ZrO_(2)-0.5纳米纤维膜具有较高的拉伸强度(4.88±0.27 MPa)、良好的柔性和优异的高温隔热性能,其1000℃热导率仅为0.167 W·m^(-1)·K^(-1),显著低于传统陶瓷隔热纤维膜。

关键词：无机非金属材料静电纺丝 SiO_(2)/ZrO_(2)纳米纤维膜耐高温性能隔热性能

超声微泡联合空化效应在声动力治疗恶性肿瘤中的应用进展

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中国医学影像学杂志 2024年第9期32卷 972-976页

作者：张丹张小杉刘笑笑赵捷王雅皙内蒙古医科大学附属医院超声科内蒙古呼和浩特010050

声动力治疗是利用声敏增强剂和低强度超声杀死恶性肿瘤的新型治疗方法,主要通过超声波机械压力、空化效应和超声触发声敏剂产生活性氧协同诱导肿瘤细胞凋亡,进而破坏肿瘤细胞。与恶性肿瘤的传统治疗方法相比,声动力治疗的精准性更高、... 详细信息

声动力治疗是利用声敏增强剂和低强度超声杀死恶性肿瘤的新型治疗方法,主要通过超声波机械压力、空化效应和超声触发声敏剂产生活性氧协同诱导肿瘤细胞凋亡,进而破坏肿瘤细胞。与恶性肿瘤的传统治疗方法相比,声动力治疗的精准性更高、组织穿透力更深、患者依从性更好、副作用更小,空化效应是影响其对恶性肿瘤治疗效果的关键,空化核的选择也是影响空化效应的重要环节之一。超声微泡造影剂作为人造空化核可显著增强和精准调控空化效应,以提高声动力治疗的效果。超声微泡联合可控性空化效应在声动力治疗恶性肿瘤领域具有广阔前景。

关键词：肿瘤超声检查微气泡空化声动力治疗综述

斑点追踪成像技术在系统性红斑狼疮患者亚临床左心室心肌损害中的应用进展

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中华医学超声杂志（电子版） 2024年第2期21卷 180-182页

作者：张丹张小杉赵捷刘笑笑金之湲王雅晳内蒙古医科大学附属医院超声科呼和浩特010050

系统性红斑狼疮(systemic lupus erythematosus,SLE)是一种免疫系统攻击自身健康细胞和组织导致全身多系统、多器官损伤,病理生理机制不明的慢性自身免疫性结缔组织病。全球SLE发病率和新诊断人数高达每年5.14/10万和40万,患病率和患病... 详细信息

系统性红斑狼疮(systemic lupus erythematosus,SLE)是一种免疫系统攻击自身健康细胞和组织导致全身多系统、多器官损伤,病理生理机制不明的慢性自身免疫性结缔组织病。全球SLE发病率和新诊断人数高达每年5.14/10万和40万,患病率和患病人口分别达每年43.7/10万和341万,给人们的生命健康带来极大威胁,也给家庭和社会带来了巨大经济负担。SLE患者死亡率是普通人群的2倍,其中感染和心血管疾病分别是病程早期和晚期最常见的死因,高达48%~78%的SLE患者发生心血管损害。

关键词：心血管损害病理生理机制斑点追踪成像技术系统性红斑狼疮多器官损伤左心室心肌心血管疾病亚临床

Assessment of the maximum allowed acid deposition load at current stage in China

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Journal of Environmental Sciences 2017年第6期29卷 140-144页

作者： Bingwen Li zhangwei Wang xiaoshan zhang Research Center for Eco-environmental Sciences Chinese Academy of SciencesBeijing 100085China

Soil acidification caused by acid deposition has been significant in some forests in southern China. We present an approach for assessing the current stage maximum allowed load （SML） of acid deposition for terrestrial system in the country. The main idea was that soil base cation exchange as a finite buffer to acidity was included in the soil acidity mass balance calculation at current acidification stage. We calculated the SML for five forests in southern China. The usual critical loads for the same forests were also calculated by the steady state mass balance model for comparison. The results showed that the SML is a more tolerant limit than the critical load for the forests with soils not acidified seriously at current stage. However, the SML become a more stringent limit to acid deposition when the forest soils have acidified seriously to very low base cation saturation. In this case the SML assessment is beneficial for the soils recovering from a serious acidified state. Based on a national scale database, the SML mapping for non-agricultural soil system in China was carried out.

关键词： Acid depositionStage maximum loadCritical load

Metal cation substitution of halide perovskite nanocrystals

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Nano Research 2022年第7期15卷 6522-6550页

作者： Yujun Xie Anqi Zhou xiaoshan zhang Qiongrong Ou Shuyu zhang Institute for Electric Light Sources School of Information Science and TechnologyFudan UniversityShanghai 200433China Institute of Future Lighting Academy for Engineering and TechnologyFudan UniversityShanghai 200433China

Recent years have seen a rapid development of lead halide perovskite(LHP)nanocrystals(NCs)as new and promising functional nanomaterials,which exhibit strong potential in a wide range of optoelectronic applications due to their superior properties and solution-processable ***,to promote their progress in commercialization,overcoming the drawbacks of intrinsic lead toxicity and optimizing material performance are important and must be solved using alternative metal ions to replace Pb *** this review,we primarily summarize the recent development of lead-substitution strategies,which focus on the commonalities and differences of their functionalities that are induced by various doped *** a brief introduction to the synthesis,nucleation and growth of all-inorganic LHP NCs,a deep discussion of the crystalline structure,electronic band structure,defect states,exciton binding energy,exciton photodynamic process and stability is ***,we highlight the importance of both theoretical calculations and experimental characterizations to establish indicative guidelines for high-performance semiconductor ***,the light emission applications are discussed,and several issues concerning future research on the controllable synthesis of halide perovskite NCs with low toxicity,superior reproducibility and properties are outlined.

关键词： perovskite nanocrystals doping lead-free photophysical mechanism

美国“中国行动计划”对我国高校国际交流合作工作的启示

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西部学刊 2024年第5期 43-46页

作者：张晓珊肖小芳中国地质大学(武汉)国际合作处武汉430074

美国司法部发起并主导的“中国行动计划”名义上结束两年多了,但其对各国之间的国际交流与合作产生的破坏性负面影响仍然在持续,不仅严重阻碍着中美科技人文领域的人才交流与合作,还进一步诱发着世界范围内科技人文领域的“寒蝉效应”... 详细信息

美国司法部发起并主导的“中国行动计划”名义上结束两年多了,但其对各国之间的国际交流与合作产生的破坏性负面影响仍然在持续,不仅严重阻碍着中美科技人文领域的人才交流与合作,还进一步诱发着世界范围内科技人文领域的“寒蝉效应”。我国现行的高校国际学术科研合作模式、科技人才培养和人才引进方式势必受到“中国行动计划”严重影响。面对挑战,高校应紧跟国家对外政策指向,通过加强科技合作和海外人才引进的合规性引导、拓宽国际交流的渠道等方式,积极稳妥地开展国际交流合作工作。

关键词： “中国行动计划” 高校国际交流合作挑战机遇启示