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Ion-exchange polymers modified bacterial cellulose electrodes for the selective removal of nitrite ions from tail water of dyeing wastewater

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Journal of Environmental Sciences 2020年第5期32卷 62-72页

作者： Danping Li xun-an Ning Yiqian yuan Yanxiang Hong Jianpei zhang School of Environment Science and Engineering Guangdong University of TechnologyGuangzhou 510006China Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control School of Environment Science and EngineeringInstitute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China

Ion-exchange polymer and modified carbonization bacterial cellulose(CBC)electrodes were fabricated using varying amounts of cation-exchange polymers(glutaric acid(GA)and sulfosuccinic acid(SSA))and assembled within an asymmetric capacitive deionization unit(p-CDI).The performance of selective NO2-electro-adsorption was *** AC/CBCSSA group showed a better salt adsorption capacity(14.56 mg/g)and nitrite removal efficiency(71.01%)than the AC/CBC-GA(10.72 mg/g,47.83%)and AC/AC(4.81 mg/g,12.74%)*** was confirmed that the CBC-SSA/GA electrodes enhanced nitrite selectivity and increased the adsorption capacity,and the total amounts of adsorbed anions increased when the applied voltage was increased from 0.8 to 1.2 V,while the molar fraction of nitrate *** competitive and preferential adsorption of anions was further investigated using different binary solutions of anions and occurred in the following sequence:NO2->SO42->NO3->F-≈Cl-.Furthermore,the p-CDI units were applied to remove nitrite in real wastewater samples,and the results showed that they had excellent reusability and application for use in dyeing wastewater treatment.

关键词： Bacterial cellulose Capacitive deionization Ionic polymer Nitrite Selective removal

Experimental study on compaction-induced anisotropic mechanical property of rockfill material

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Frontiers of Structural and Civil Engineering 2021年第1期15卷 109-123页

作者： Xiangtao zhang Yizhao GAO yuan WANG Yu-zhen YU xun SUN State Key Laboratory of Hydroscience and Engineering Department of Hydraulic EngineeringTsinghua UniversityBeijing 100084China

The anisotropy of rockfill materials has a significant influence on the performance of engineering ***,relevant research data are very limited,because of the difficulty with preparing specimens with different inclination angles using traditional ***,the anisotropy test of rockfill materials is complex and complicated,especially for triaxial tests,in which the major principal stress plane intersects with the compaction plane at different *** this study,the geometric characteristics of a typical particle fraction consisting of a specific rockfill material were statistically investigated,and the distribution characteristics of particle orientation in specimens prepared via different compaction methods were *** high-density rockfill materials,a set of specimen preparation devices for inclined compaction planes was developed,and a series of conventional triaxial compression tests with different principal stress direction angles were *** results reveal that the principal stress direction angle has a significant effect on the modulus,shear strength,and dilatancy of the compacted rockfill *** of the relationship between the principal stress direction angles,change in the stress state,and change in the corresponding dominant shear plane shows that the angle between the compacted surface and dominant shear plane is closely related to interlocking resistance associated with the particle *** addition,different principal stress direction angles can change the extent of the particle interlocking effect,causing the specimen to exhibit different degrees of anisotropy.

关键词： rockfill inclination of specimen preparation anisotropy mechanical property mechanism

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超声手控器和输尿管镜的连接改造

中国医疗设备 2014年第10期29卷 117-118页

作者：张元勋陈云彭天舟王上东温州医科大学附属第三医院设备科浙江温州325200

通过分析输尿管镜下超声碎石术中的超声探针损坏率高的原因,设计了两种新型的超声手控器和输尿管镜的连接器械。通过对比,选择其中一种连接器械进行临床使用,结果表明,该器械便于临床操作,同时可以延长镜下超声探针的使用寿命。

关键词：超声手控器输尿管镜超声碎石术超声探针连接器械

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室内气溶胶纳米颗粒物的粒径分布特征

中国科学院研究生院学报 2007年第5期24卷 705-709页

作者：张元勋杨传俊陆文忠杨永兴张桂林李燕中国科学院上海应用物理研究所上海201800

研究室内气溶胶纳米粒径颗粒物的环境行为和污染特征对室内空气质量的影响具有重要意义.采用WPSTMModel 1000XP宽范围粒径谱仪测量了粒径介于10~10000nm之间的气溶胶纳米颗粒物.主要探讨了粒径在10~500nm间的气溶胶纳米颗粒物在不同室... 详细信息

研究室内气溶胶纳米粒径颗粒物的环境行为和污染特征对室内空气质量的影响具有重要意义.采用WPSTMModel 1000XP宽范围粒径谱仪测量了粒径介于10~10000nm之间的气溶胶纳米颗粒物.主要探讨了粒径在10~500nm间的气溶胶纳米颗粒物在不同室内条件的粒径分布特征.结果发现,超细颗粒物(纳米粒径10~500nm)对总粒子数浓度贡献较大,而细颗粒物500nm^10μm对总粒子质量浓度贡献较大,导致室内颗粒物粒子质量浓度通常比室外低,表现出室内污染以纳米粒径超细颗粒物为主的特点.抽烟明显增大纳米颗粒物粒子数浓度和粒子质量浓度.研究表明,室内空气质量对人体健康的影响可能超过室外,应当引起足够的重视和关注.

关键词：纳米颗粒物粒径分布室内空气

High-dose dexamethasone regulates microglial polarization via the GR/JAK1/STAT3 signaling pathway after traumatic brain injury

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Neural Regeneration Research 2025年第9期20卷 2611-2623页

作者： Mengshi Yang Miao Bai yuan Zhuang Shenghua Lu Qianqian Ge Hao Li Yu Deng Hongbin Wu Xiaojian Xu Fei Niu Xinlong Dong Bin zhang Baiyun Liu Beijing Tiantan Hospital Capital Medical UniversityBeijingChina Department of Neurology The First Hospital of Tsinghua UniversityBeijingChina Department of Neurotrauma and Beijing Key Laboratory of Central Nervous System Injury Beijing Neurosurgical InstituteCapital Medical UniversityBeijingChina Department of Critical Care Medicine Beijing Tiantan HospitalCapital Medical UniversityBeijingChina Center for Nerve Injury and Repair Beijing Institute of Brain DisordersChina National Clinical Research Center for Neurological DiseasesBeijingChina

Although microglial polarization and neuroinflammation are crucial cellular responses after traumatic brain injury,the fundamental regulatory and functional mechanisms remain insufficiently *** potent anti-inflammato ry agents,the use of glucoco rticoids in traumatic brain injury is still controversial,and their regulatory effects on microglial polarization are not yet *** the present study,we sought to determine whether exacerbation of traumatic brain injury caused by high-dose dexamethasone is related to its regulatory effects on microglial polarization and its mechanisms of *** vitro cultured BV2 cells and primary microglia and a controlled cortical impact mouse model were used to investigate the effects of dexamethasone on microglial ***,dexamethasone,RU486(a glucocorticoid receptor antagonist),and ruxolitinib(a Janus kinase 1 antagonist)were ***-sequencing data obtained from a C57BL/6 mouse model of traumatic brain injury were used to identify potential targets of *** Morris water maze,quantitative reverse transcription-polymerase chain reaction,western blotting,immunofluorescence and confocal microscopy analysis,and TUNEL,Nissl,and Golgi staining were performed to investigate our ***-throughput sequencing results showed that arginase 1,a marker of M2 microglia,was significantly downregulated in the dexamethasone group compared with the traumatic brain injury group at3 days post-traumatic brain *** dexamethasone inhibited M1 and M2 microglia,with a more pronounced inhibitory effect on M2microglia in vitro and in *** receptor plays an indispensable role in microglial polarization after dexamethasone treatment following traumatic brain ***,glucocorticoid receptor activation increased the number of apoptotic cells and neuronal death,and also decreased the density of dendritic spines.A possible downstream receptor signaling mechanism is th

关键词： apoptosis BV2 microglia dexamethasone glucocorticoid receptor glucocorticoids innate immune system microglial polarization neuroinflammation primary microglia traumatic brain injury

Catalytic oxidation of low concentration formaldehyde over Pt/TiO_(2) catalyst

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Chinese Journal of Chemical Engineering 2021年第1期34卷 190-195页

作者： yuan Su Keming Ji Jiayao xun Kan zhang Ping Liu Liang Zhao State Key Laboratory of Coal Conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China

Formaldehyde(HCHO) is an important indoor *** oxidize low concentration HCHO is an effective way to eliminate indoor *** this study,a series of Pt/TiO_(2) catalysts are prepared by impregnation and reduced by NaBH_*** effects of loading amount of Pt and cry stal type of TiO_(2) on the physical and chemical properties and the catalytic performance in HCHO oxidation reaction are *** results show that the quantity of active site and the oxygen vacancy of catalysts increa sed with increasing Pt content,which is beneficial to promote the further performance of ***,with the further rises of Pt content,the specific surface area further decreases,and the proportion of Pt^(2+) species on the catalyst surface which is significant to catalytic properties also decreases,causing catalytic performance *** with the catalyst supporting on rutile,the Pt/α-TiO_(2) catalyst supporting on anatase has larger specific surface area,more Pt^(2+) phase and easier to form oxygen vacancy in the support,which cause better catalytic *** catalyst with Pt content of0.1 wt% and supported by anatase TiO_(2) has the best catalytic *** HCHO conversion efficiency reaches 98% and 100% at 50℃ and 100 ℃, and the stabilization time is longer than 140 h.

关键词： Catalyst support Catalysis Fixed-bed Pt/TiO_(2)

Efficient fine-grained shared buffer management for multiple OpenCL devices

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Journal of Zhejiang University-Science C(Computers and Electronics) 2013年第11期14卷 859-872页

作者： Chang-qing xun Dong CHEN Qiang LAN Chun-yuan zhang College of Computer National University of Defense Technology State Key Laboratory of High Performance Computing National University of Defense Technology

OpenCL programming provides full code portability between different hardware platforms,and can serve as a good programming candidate for heterogeneous systems,which typically consist of a host processor and several ***,to make full use of the computing capacity of such a system,programmers are requested to manage diverse OpenCL-enabled devices explicitly,including distributing the workload between different devices and managing data transfer between multiple *** these tedious jobs pose a huge challenge for *** this paper,a distributed shared OpenCL memory(DSOM) is presented,which relieves users of having to manage data transfer explicitly,by supporting shared buffers across *** allocates shared buffers in the system memory and treats the on-device memory as a software managed virtual cache *** support fine-grained shared buffer management,we designed a kernel parser in DSOM for buffer access range analysis.A basic modified,shared,invalid cache coherency is implemented for DSOM to maintain coherency for cache *** addition,we propose a novel strategy to minimize communication cost between devices by launching each necessary data transfer as early as *** strategy enables overlap of data transfer with kernel *** experimental results show that the applicability of our method for buffer access range analysis is good,and the efficiency of DSOM is high.

关键词： Shared buffer OpenCL Heterogeneous programming Fine grained

绿茶提取液中茶多酚和儿茶素的萃取分离动态模型

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四川农业大学学报 2002年第3期20卷 221-224页

作者：杜晓何春雷郑元勋四川农业大学林学园艺学院四川雅安625014

应用乙酸乙酯作溶媒 ,从绿茶提取液中萃取茶多酚、儿茶素。采用二次通用旋转组合设计 ,建立了试验因素为 :茶液用量 (X1)、溶媒用量 (X2 )和振摇时间 (X3 )与萃取率 (Y)的数学模型。并对萃取中的动态变化进行了系统分析。

关键词：绿茶提取液儿茶素萃取分离动态模型茶多酚数学模型

Detection of engineering vehicles in high-resolution monitoring images

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Frontiers of Information Technology & Electronic Engineering 2015年第5期16卷 346-357页

作者： xun LIU Yin zhang San-yuan zhang Ying WANG Zhong-yan LIANG Xiu-zi YE College of Computer Science and Technology Zhejiang University College of Mathematics and Information Science Wenzhou University

This paper presents a novel formulation for detecting objects with articulated rigid bodies from highresolution monitoring images, particularly engineering vehicles. There are many pixels in high-resolution monitoring images, and most of them represent the background. Our method first detects ob ject patches from monitoring images using a coarse detection process. In this phase, we build a descriptor based on histograms of oriented gradient, which contain color frequency information. Then we use a linear support vector machine to rapidly detect many image patches that may contain ob ject parts, with a low false negative rate and a high false positive rate. In the second phase, we apply a refinement classification to determine the patches that actually contain ob jects. In this stage, we increase the size of the image patches so that they include the complete ob ject using models of the ob ject *** an accelerated and improved salient mask is used to improve the performance of the dense scale-invariant feature transform descriptor. The detection process returns the absolute position of positive ob jects in the original images. We have applied our methods to three datasets to demonstrate their effectiveness.

关键词： Object detection Histogram of oriented gradient (HOG) Dense scale-invariant feature transform(dense SIFT) Saliency Part models Engineering vehicles