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Environmental fate and behavior of silver nanoparticles in natural estuarine systems

Journal of Environmental Sciences 2020年第2期32卷 248-259页

作者： Penghui Li Min su Xiaodan Wang Xiaoyan Zou Xia sun Junpeng Shi Hongwu Zhang Key Laboratory of Urban Pollutant Conversion Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China University of Chinese Academy of Sciences Beijing 100049China

Silver nanoparticles(AgNPs) are widely used in many consumer products, whereas their environmental behaviors in natural aquatic systems remain unknown, especially in natural brackish ***, it is urgent to investigate the environmental fate of AgNPs in natural brackish ***, we investigated the stability of citrate-coated AgNPs in natural brackish water collected from 6 different sites with distinct salinities in the Xinglinwan Reservoir, located in Xiamen City, southeast *** obtained results showed that AgNP colloids remained stable in low-salinity waters, which was mainly determined by the effects of dissolved organic matter(DOM) promoting the stability of the ***, the environmental fate of AgNPs in high-salinity waters was dominated by the salinity or ionic strength, especially the free ion concentrations of cl-, SO42-, or S2-, resulting in rapid sedimentation and *** addition, both DOM and salinity contributed to the environmental behavior of AgNPs in moderate-salinity waters,ultimately resulting in either colloidal stability or ***, these results may reveal that AgNPs remain relatively stable for a long period in low-salinity natural waters,and that the stability might gradually decrease as AgNPs are transferred from freshwaters through brackish waters and eventually end up in seawater along the *** findings also further indicate that the toxicity and potential risks of AgNPs may present more serious threats to the environment and organisms in natural freshwaters than in natural estuarine systems or seawater.

关键词： Silver nanoparticles Salinity Dissolved organic matter Environmental fate Potential toxicity Natural brackish system

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奥氮平对精神分裂症患者的认知功能及血清炎性因子的影响

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国际精神病学杂志 2024年第1期51卷 63-65页

作者：石临娟王艳芳苏永仙临汾市第五人民医院精神科临汾041000

目的探讨奥氮平对精神分裂症患者的认知功能及血清炎性因子水平的影响。方法纳入临汾市第五人民医院2020年1月~2023年2月的84例精神分裂症患者为研究对象,按抽签法随机法分为两组,利培酮组41例,奥氮平组43例。利培酮组采用利培酮治疗,... 详细信息

目的探讨奥氮平对精神分裂症患者的认知功能及血清炎性因子水平的影响。方法纳入临汾市第五人民医院2020年1月~2023年2月的84例精神分裂症患者为研究对象,按抽签法随机法分为两组,利培酮组41例,奥氮平组43例。利培酮组采用利培酮治疗,奥氮平组采用奥氮平治疗,均治疗12周。比较治疗前后阴性和阳性症状量表(positive and negative syndrome scale,PANSS)、蒙特利尔认知评估量表(montreal cognitive assessment,MoCA)以及血清炎性因子水平。结果治疗后两组PANSS各项评分均显著低于治疗前,治疗后奥氮平组显著低于利培酮组(P<0.05);治疗后两组MoCA评分显著升高,血清白介素-6(interleakin-6,IL-6)、肿瘤坏死因子-α(tumor necrosis factor-α,TNF-α)水平显著降低,且治疗后奥氮平组MoCA评分高于利培酮组,血清炎性因子水平显著低于利培酮组(P<0.05)。结论奥氮平治疗精神分裂症患者能够获得显著的临床疗效,并且能够促进其认知功能改善,可能与下调血清炎性因子水平有关。

关键词：奥氮平精神分裂症认知功能炎性因子

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ris辅助通感一体化:波束成形和反射相移的联合设计

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移动通信 2024年第3期48卷 61-65,74页

作者：陶启慧粟欣刘蓓许希斌重庆邮电大学通信与信息工程学院重庆400065 清华大学电子系北京100084 清华大学北京信息科学与技术国家研究中心北京100084

ISAC允许通信和雷达共享频谱资源,被视为解决未来无线网络频谱拥塞的一项有前途的技术。当信道退化严重时,仅依靠基站侧天线获得的性能增益十分有限,ris因其能够创建有利的传播环境已成为一项革命性技术,借助ris可为ISAC系统创建额外的... 详细信息

ISAC允许通信和雷达共享频谱资源,被视为解决未来无线网络频谱拥塞的一项有前途的技术。当信道退化严重时,仅依靠基站侧天线获得的性能增益十分有限,ris因其能够创建有利的传播环境已成为一项革命性技术,借助ris可为ISAC系统创建额外的链路以提高系统性能。基于此,提出ris辅助ISAC,通过联合设计基站的有源波束成形和ris的反射相移,以最大化加权和速率与探测功率,并提出了基于加权均方最小误差和分数规划的交替算法来解决这一问题。仿真结果证明在ISAC中部署ris并合理优化其相移可以有效提升通信和感知的性能。

关键词：通信感知一体化可重构智能表面波束成形设计反射相移设计

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基于蛋白组学和代谢组学在血液存储中相关性分析

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临床输血与检验 2024年第5期26卷 609-616页

作者：苏晓敏张国权王锦徐华陕西省血液中心西安710061

目的红细胞(RBC)储存损伤一直是RBC体外储存研究所关注的重要问题,涉及到RBC储存过程中一系列生理、生化、形态和组学成分的改变,这些改变相互作用从而对储存RBC产生影响。为了进一步阐明RBC储存损伤机制,通过多组学研究储存期悬浮RBC... 详细信息

目的红细胞(RBC)储存损伤一直是RBC体外储存研究所关注的重要问题,涉及到RBC储存过程中一系列生理、生化、形态和组学成分的改变,这些改变相互作用从而对储存RBC产生影响。为了进一步阐明RBC储存损伤机制,通过多组学研究储存期悬浮RBC损伤机制。方法取一次性使用塑料血袋采集的悬浮RBC共10袋(ALT化验结果不合格),将已制备的RBC放4℃冰箱中储存,分别于储存0周、1周、3周和5周取样,按RBC质量标准进行检测(HCT、HGB和储存期末溶血率)。检测其在不同保存期的各项生化指标(K^(+)、Na^(+)、cl^(-)、Ca^(2+)、Glu和LDH)。进行蛋白组学和代谢组学检测,通过生物信息学分析评价悬浮RBC储存过程中相关生物学功能变化情况及相关性。结果符合悬浮RBC质量国家标准,其生化指标K^(+)和LDH随着保存时间的延长而有所升高,Na^(+)和Glu随着保存时间的延长而有所下降,在保存5周时差异显著(Pcl^(-)和Ca^(2+)变化不明显(P>0.05)。我们根据筛查的蛋白质以及其下游的差异代谢物变化情况,进行了蛋白组学与代谢组学整合分析,通过不同层次的生物分子之间的关联研究,发现悬浮RBC的储存对RBC代谢等过程影响更明显,特别是核苷酸代谢、嘌呤代谢及蛋白质的消化和吸收等代谢相关通路,对RBC代谢相关蛋白影响反而小一些。结论我们通过使用代谢组学和蛋白组学检测,促进RBC结构、功能等的研究,为深入研究悬浮RBC储存损伤机制奠定了良好基础。

关键词：红细胞代谢组学蛋白组学联合分析

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ICP-MS测定西藏热泉水中总砷

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化学研究与应用 2024年第2期36卷 437-443页

作者：李永林周会东王祝苏思强冯源强胡亚燕西藏自治区地质矿产勘查开发局中心实验室西藏自治区拉萨市850033

西藏地区热泉水矿化度较高,不同类型热泉水砷含量差异大。为快速准确测定其中砷的含量,建立了碰撞模式-电感耦合等离子体质谱测定热泉水中总砷的方法。研究了样品保存条件、样品稀释倍数、KED气流量等条件对测定结果的影响。通过优化仪... 详细信息

西藏地区热泉水矿化度较高,不同类型热泉水砷含量差异大。为快速准确测定其中砷的含量,建立了碰撞模式-电感耦合等离子体质谱测定热泉水中总砷的方法。研究了样品保存条件、样品稀释倍数、KED气流量等条件对测定结果的影响。通过优化仪器的工作条件、样品稀释等方法,消除了低分压和高矿化度的影响,运用碰撞池技术,有效消除^(40)Ar^(35)cl^(+)、^(40)Ca^(35)cl^(+)、^(39)K^(36)Ar^(+)对砷的干扰。在样品中加入乙醇溶液,提高砷的灵敏度。结果表明:砷的检出限(3s)为0.22μg·L^(-1),加标回收率在91.01%~108.96%之间,测定值的相对标准偏差(n=6)为2.2~4.5%,方法可以快速、准确测定西藏热泉水中总砷。

关键词：电感耦合等离子体质谱法热泉水碰撞池砷

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Symbolic regression in materials science via dimension-synchronous-computation

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Journal of Materials Science & Technology 2022年第27期122卷 77-83页

作者： Changxin Wang Yan Zhang Cheng Wen Mingli Yang Turab Lookman Yanjing su Tong-Yi Zhang Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Corrosion and Protection Center University of Science and Technology BeijingBeijing 100083China Research Center for Materials Genome Engineering Sichuan UniversityChengdu 610065China Ai Materials Research LLC Santa FeNM 87501United States of America School of Materials Science and Engineering Harbin Institute of TechnologyShenzhenChina Materials Genome Institute Shanghai University333 Nanchen RoadShanghai 200444China

There is growing interest in applying machine learning techniques in the field of materials ***,the interpretation and knowledge extracted from machine learning models is a major concern,particularly as formulating an explicit model that provides insight into physics is the goal of *** the present study,we propose a framework that utilizes the filtering ability of feature engineering,in conjunction with symbolic regression to extract explicit,quantitative expressions for the band gap energy from materials *** propose enhancements to genetic programming with dimensional consistency and artificial constraints to improve the search efficiency of symbolic *** show how two descriptors attributed to volumetric and electronic factors,from 32 possible candidates,explicitly express the band gap energy of Na cl-type *** approach provides a basis to capture underlying physical relationships between materials descriptors and target properties.

关键词： Symbolic regression Band gap Dimensional calculation

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Tuning the reactivity of Al-Ni by fine coating of halogen-containing energetic composites

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Defence Technology（防务技术） 2022年第10期18卷 1810-1821页

作者： su-lan Yang Ke-juan Meng Wu-xi Xie Hong-qi Nie Qi-Long Yan Science and Technology on Combustion Internal Flow and Thermo-Structure LaboratoryNorthwestern Polytechnical UniversityXi'an710072China b Xi'an Modern Chemistry Research Institute Xi'an710065China

In this paper,various core-shell structured Al—Ni@ECs composites have been prepared by a spray-drying *** involved ECs refer to the energetic composites(ECs)of ammonium perchlorate/nitrocellulose(AP/NC,NA)and polyvinylidene fluoride/hexanitrohexaazaisowurtzitane(PVDF/cl-20,PC).Two Al—Ni mixtures were prepared at atomic ratios of 1:1 and 1:3 and named as Al/Ni and Al/3Ni,*** thermal reactivity and combustion behaviors of Al—Ni@ECs composites have been comprehensively *** showed that the reactivity and combustion performance of Al—Ni could be enhanced by introducing both NA and PC energetic *** which the Al/Ni@NA composite exhibited higher reactivity and improved combustion *** measured flame propagation rate(v=20.6 mm/s),average combustion wave temperature(T_(max)=1567.0°C)and maximum temperature rise rate(γ_(t)=1633.6°C/s)of Al/Ni@NA are higher than that of the Al/Ni(v=15.8 mm/s,T_(max)=858.0°C,andγ_(t)=143.5°C/s).The enhancement in combustion properties could be due to presence of the acidic gaseous products from ECs,which could etch the Al_(2)O_(3)shell on the surface of Al particles,and make the inner active Al to be easier transported,so that an intimate and faster intermetallic reaction between Al and Ni would be ***,the morphologies and chemical compositions of the condensed combustion products(CCPs)of Al—Ni@ECs composites were found to be different depending on the types of *** compositions of CCPs are dominated with the Al—Ni intermetallics,combining with a trace amount of Al_(5)O_(6)N and Al_(2)O_(3).

关键词： Arrested high energy ball milling Intermetallic alloy Combustion performance Energetic composites Reactivity control

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Thermo-driven oleogel-based self-healing slippery surface behaving superior corrosion inhibition to Mg-Li alloy

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Journal of Magnesium and Alloys 2023年第12期11卷 4710-4723页

作者： Yibo Ouyang Huijun Kang Enyu Guo Ri Qiu Keqiang su Zongning Chen Tongmin Wang Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024PR China Ningbo Institute of Dalian University of Technology Ningbo 315000PR China College of Safety and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590PR China State Key Laboratory for Marine Corrosion and Protection Luoyang Ship Material Research InstituteQingdao 266101PR China Institute of Yellow River Delta Earth surface Processes and Ecological Integrity Shandong University of Science and TechnologyPR China

Bioinspired by Nepenthes, lubricant infused surfaces(LIS) have attracted widespread attention in the field of anticorrosion. However,the lubricant coating has some disadvantages such as complex construction processing and easy loss of oil phase in air or dynamic water phase. In this study, oleogel is infused into a lotus leaf inspired super-hydrophobic matrix to form an oleogel infused surface(OIS) for enhancing corrosion resistance of active Mg-Li alloy. For reserving oleogel, firstly, a facile one-step electrodeposition method is used to construct super-hydrophobic surface(SHS) composed by samarium/myristic acid complex micro-nano flower structure onto Mg-Li *** coating exhibits excellent superhydrophobic property at a static contact angle of 160° by applying 30 V electrolysis for 30 min. The protection efficiency of single SHS highly relates with the metal itself. For short period immersion in water phase, SHS can afford protection to Mg-Li alloy. However, the long-term immersion will see the rapid failure of SHS, and the high activity of Mg-Li alloy is one main *** assume that SHS cannot be a good choice for protecting Mg-Li alloy. Then, a Nepenthes inspired liquid coating is formed by infusing oleogel into the micro-nano structure by a spin-coating method. The liquid coating performs prominent corrosion resistance with Rctreaching as high as 1.51 × 10^(10)Ω cm^(2). After the mechanical damage from the external environment, the liquid coating can realize self-repair through thermal assistance, and the liquid coating can still restore Rctup to 1.24 × 10^(10)Ω cm^(2) after healing. The corrosion resistance of the liquid coating remains strong by showing Rctas high as 1.14 × 10^(9)Ω cm^(2), even after immersion in representative corrosive 3.5 wt% Na cl solution for 30 d.

关键词： Mg-Li alloy Oleogel superhydrophobic Self-healing Corrosion

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A Method to Adjust Dielectric Property of SiC Powder in the GHz Range

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Journal of Materials Science & Technology 2011年第5期27卷 421-425页

作者： Xiaolei su Jie Xu Zhimin Li Junbo Wang Xinhai He Chong Fu WanchengZhou College of Mechanical & Electronic Engineering Xi'an Polytechnic University Xi~an 710048 China School of Technical Physics Xidian University Xi'an 710071 China State Key Laboratory of Solidification Processing Northwestern Polyteehnical University Xi'an 710072 China

The SiC powders by AI or N doping have been synthesized by combustion synthesis, using AI powder and NH4cl powder as the dopants and polytetrafluoroethylene as the chemical activator. Characterization by X-ray diffraction, Raman spectrometer, scanning electron microscopy and energy dispersive spectrometer demonstrates the formation of Al doped SiC, N doped SiC and the AI and N co-doped SiC solid solution powders, respectively. The electric permittivities of prepared powders have been determined in the frequency range of 8.2-12.4 GHz. It indicates that the electric permittivities of the prepared SiC powders have been improved by the pure AI or N doping and decrease by the AI and N co-doping. The paper presents a method to adjust dielectric property of SiC powders in the GHz range.

关键词： Silicon carbide Combustion synthesis Dielectric property

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Using highly concentrated chloride solutions to leach valuable metals from cathode-active materials in spent lithium-ion batteries

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Rare Metals 2021年第7期40卷 1971-1978页

作者： Ai-Fei Yi Zhao-Wu Zhu Ya-Hui Liu Jian Zhang Hui su Tao Qi National Engineering Laboratory for Hydrometallurgical cleaner Production Technology Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemistry and Chemical Engineering University of Chinese Academy of SciencesBeijing 101407China

This study focused on the extraction of valuable metals from the cathode-active materials in spent lithiumion batteries using a high-concentration chloride *** effects of the concentrations of ammonium chloride(NH4 cl),hydrochloric acid(Hcl),and reductants such as hydrogen peroxide(H_(2)O_(2))and urea(CO(NH_(2))_(2))on metal extraction and chlorine production were studied *** leaching mechanism was analyzed,and a leaching model was *** was found that the addition of solid NH4 cl to an Hcl solution significantly improved the metal extraction capability of the latter and reduced the formation of chlorine gas by 96.0%compared to that only using *** activation energies for leaching Li,Ni,Co,and Mn were determined to be 30.4,38.5,30.6,and 38.2 kJ·mol^(-1),*** study demonstrates an environmentally friendly method for recycling metal resources from cathode-active materials and furthers understanding of how NH4 cl inhibits chlorine production when leaching with mixed solutions of Hcl and NH4 cl.

关键词： Lithium-ion batteries Hydrochloric acid Ammonium chloride Chlorine gas

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