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煤炭科学技术 2023年第1期51卷 523-530页

作者：何绪文王绍州张学伟李福勤中国矿业大学(北京)化学与环境工程学院北京100083 河北工程大学能源与环境工程学院河北邯郸056038

国家对煤矿矿井水资源化利用高度重视,排放标准的不断提高和智慧矿山概念的不断深化,给矿井水处理技术提出了新的挑战。通过对矿井水地面处理技术与井下多级过滤处理技术的分析和比较,在总结了现有技术存在问题的基础上,提出了聚瓷膜超... 详细信息

国家对煤矿矿井水资源化利用高度重视,排放标准的不断提高和智慧矿山概念的不断深化,给矿井水处理技术提出了新的挑战。通过对矿井水地面处理技术与井下多级过滤处理技术的分析和比较,在总结了现有技术存在问题的基础上,提出了聚瓷膜超滤高效处理矿井水新技术。新技术相比于传统处理技术的多流程而言,因处理过程无需加药,可省去整个加药系统,故处理过程仅包括高压预处理与常压过滤处理2个主要单元,解决了矿井水传统处理方法必须加混凝剂的难题,可真正做到矿井水处理全过程无人值守,符合智慧矿山的要求。新技术具有流程短、占地小、无需加药、出水水质稳定、可自动运行等特点,同时还可实现模块化、智能化,可适用于不同场景下含高悬浮物矿井水的直接过滤,或作为矿井水苦咸水的预处理单元,其中特别适合用于矿井水的井下处理就地复用。其核心组件聚瓷膜更是具有强度高、通量大、超亲水疏油、耐受悬浮物(SS)质量浓度可达10 000 mg/L等优势。通过实验室试验和矿井水地面处理改造工程案例可知,在进水SS质量浓度为0~10 000 mg/L,聚瓷膜直滤后出水SS均能稳定达到1 mg/L以下,浊度稳定达到1 NTU以下,该技术在煤矿矿井水资源化利用方面有明显优势,可为将来的大规模工程化推广应用提供技术参考。

关键词：矿井水悬浮物聚瓷膜资源化利用煤矿

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ISAR Imaging Based on Block Sparse Smoothed L0 Norm Recovery Algorithm

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Journal of Physics: Conference Series 2019年第3期1213卷

作者： Junjie Feng xuwen zhang Yonghui Wang School of Electrical engineering Liupanshui Normal University Liupanshui Guizhou 553004 China College of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics Nanjing 211106 China

In order to obtain high resolution inverse synthetic aperture radar (ISAR) sparse images, a block sparse signal recovery ISAR imaging algorithm is proposed by considering the cluster characteristics of target in this paper. Firstly, the ISAR sparse imaging model is established, the imaging is converted to L0 norm optimization problem. Secondly, one negative exponential function sequence is used as smoothed function to approach the block L0 norm. Finally, the revised step is added to ensure solving the optimization problem along the steepest descent gradient direction and the cost function is updated for the next loop. Simulation results verify the proposed algorithm is effective.

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Adaptable graphitic C6N6-based copper single-atom catalyst for intelligent biosensing

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NATURE COMMUNICATIONS 2023年第1期14卷 1-11页

作者： Hong, Qing Yang, Hong Fang, Yanfeng Li, Wang Zhu, Caixia Wang, Zhuang Liang, Sicheng Cao, xuwen Zhou, Zhixin Shen, Yanfei Liu, Songqin zhang, Yuanjian Southeast Univ Sch Chem & Chem Engn Jiangsu Engn Lab Smart Carbon Rich Mat & Device Jiangsu Prov Hitech Key Lab Biomed Res Nanjing 211189 Peoples R China Southeast Univ Med Sch Nanjing 210009 Peoples R China

Self-adaptability is highly envisioned for artificial devices such as robots with chemical noses. For this goal, seeking catalysts with multiple and modulable reaction pathways is promising but generally hampered by inconsistent reaction conditions and negative internal interferences. Herein, we report an adaptable graphitic C6N6-based copper single-atom catalyst. It drives the basic oxidation of peroxidase substrates by a bound copper-oxo pathway, and undertakes a second gain reaction triggered by light via a free hydroxyl radical pathway. Such multiformity of reactive oxygen-related intermediates for the same oxidation reaction makes the reaction conditions capable to be the same. Moreover, the unique topological structure of CuSAC6N6 along with the specialized donor-pi-acceptor linker promotes intramolecular charge separation and migration, thus inhibiting negative interferences of the above two reaction pathways. As a result, a sound basic activity and a superb gain of up to 3.6 times under household lights are observed, superior to that of the controls, including peroxidase-like catalysts, photocatalysts, or their mixtures. CuSAC6N6 is further applied to a glucose biosensor, which can intelligently switch sensitivity and linear detection range in vitro. Catalysts with multiple and modulable reaction pathways are promising but generally hampered by inconsistent reaction conditions and negative internal interferences. Herein, the authors report an adaptable graphitic C6N6-based copper singleatom catalyst

关键词： Bioanalytical chemistry Biocatalysis Materials for energy and catalysis

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Comparison of whole-body 18F-FDG PET/CT and PET/MRI for distant metastases in patients with malignant tumors: a meta-analysis

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BMC CANCER 2023年第1期23卷 37-37页

作者： zhang, Cici Liang, Zhishan Liu, Wei Zeng, xuwen Mo, Yuzhen Guangzhou Red Cross Hosp Dept Radiol Guangzhou Peoples R China Peoples Hosp Guangxi Zhuang Autonomous Reg Dept Cardiol Nanning Peoples R China Guangzhou Red Cross Hosp Dept Breast Guangzhou Peoples R China 396 TongFu Rd HaiZhu Dist Guangzhou Guangdong Peoples R China

Background As a first-line imaging modality, whole-body fluorine-18 fluorodeoxyglucose (18F-FDG) positron emission tomography (PET)/computed tomography (CT) and 18F-FDG PET/magnetic resonance imaging (MRI) had been widely applied in clinical practice. However, 18F-FDG PET/MRI may be superior to PET/CT for the diagnosis of distant metastases in patients with advanced-stage. Therefore, it is timely and important to systematically determine the diagnostic accuracy of 18F-FDG PET/MRI compared with that of 18F-FDG PET/CT for the diagnosis of distant *** This study aimed to compare the diagnostic accuracy of 18F-FDG PET/CT and PET/MRI for the diagnosis of distant metastases in patients with malignant tumors. Relevant studies using both 18F-FDG PET/CT and PET/MRI for assessment of distant metastases in patients with malignant tumors were searched in PubMed, Embase, The Cochrane Library, and Scopus from January 2010 to November 2023. Two reviewers independently selected studies according to the inclusion and exclusion criteria. A reviewer extracted relevant data and assessed the quality of the eligible studies. The pooled sensitivity, specificity, positive likelihood ratio, negative likelihood ratio, and area under the summary receiver operating characteristic curve (AUC) for 18F-FDG PET/CT and PET/MRI were analyzed. Subgroup analysis was *** Across 14 studies (1042 patients), 18F-FDG PET/MRI had a higher sensitivity (0.87 versus 0.81), AUC value (0.98 versus 0.95), and similar specificity (0.97 versus 0.97), than PET/CT for detecting distant metastases. In 3 studies of breast cancer (182 patients), 18F-FDG PET/MRI had a higher sensitivity (0.95 versus 0.87) and specificity (0.96 versus 0.94) than PET/CT. In 5 studies of lung cancer (429 patients), 18F-FDG PET/CT had a higher sensitivity (0.87 versus 0.84) and a lower specificity (0.95 versus 0.96) to PET/*** 18F-FDG PET/MRI and PET/CT both performed well as detectors of distant meta

关键词： Tumor Distant metastases Positron emission tomography magnetic resonance imaging computed tomography

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Ultraflexible Reedlike Carbon Nanofiber Membranes Decorated with Ni-Co-S Nanosheets and Fe2O3-C Core-Shell Nanoneedle Arrays as Electrodes of Flexible Quasi-Solid-State Asymmetric Supercapacitors

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ACS APPLIED ENERGY MATERIALS 2021年第2期4卷 1505-1516页

作者： zhang, Ming Wu, xuwen Yang, Dongzhi Qin, Liyuan zhang, Shiyi Xu, Ting Zhao, Tianyu Yu, Zhong-Zhen Beijing Univ Chem Technol State Key Lab Organ Inorgan Composites Coll Mat Sci & Engn Beijing 100029 Peoples R China Beijing Univ Chem Technol Beijing Key Lab Adv Funct Polymer Composites Beijing 100029 Peoples R China Beijing Univ Chem Technol State Key Lab Organ Inorgan Composites Coll Mat Sci & Engn Beijing Key Lab Adv Funct Polymer Composites Beijing 100029 Peoples R China Beijing Univ Chem Technol Beijing Adv Innovat Ctr Soft Matter Sci & Engn Beijing 100029 Peoples R China

Flexible and lightweight supercapacitors with satisfactory energy density and long-term stability are urgently required to provide power for flexible, foldable, and wearable electronic devices. Herein, reedlike carbon nanofibers (RCNFs) with hierarchical macropores in the core and micropores and honeycomb mesopores in the shell are designed by electrospinning, carbonization, and etching, leading to high electronic conductivity and satisfactory mechanical flexibility and foldability. Subsequently, flowerlike Ni-Co-S nanoarrays are grown in situ on RCNFs by electrodeposition, and fern leaf-like Fe2O3-C core-shell nanoneedles, in which porous Fe2O3 are coated with ultrathin carbon layers, are decorated on RCNFs via hydrothermal synthesis, polydopamine modification, and thermal annealing. Because of unique core-shell structures and synergistic effects of these active components, the RCNF@ Ni-Co-S cathode and the RCNF@Fe2O3-C anode exhibit high specific capacitances of 1728 and 221.5 F g(-1) at 1 A g(-1), respectively. With a poly(vinyl alcohol) (PVA)/potassium hydroxide (KOH) solid gel as both an electrolyte and a separator, the assembled flexible quasi-solid-state asymmetric supercapacitor achieves a high energy density of 44.9 W h kg(-1) at 1549.7 W kg(-1), and the capacitance remains at 94% after bending the asymmetric supercapacitor to 180 degrees. The flexible electrodes with excellent electrochemical performances are highly promising for high-performance wearable energy storage devices.

关键词： electrospinning asymmetric supercapacitors carbon nanofibers Ni-Co-S nanosheets Fe2O3-C nanoneedles

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Hollow ZIF-67 derived porous cobalt sulfide as an efficient bifunctional electrocatalyst for overall water splitting

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NEW JOURNAL OF CHEMISTRY 2021年第37期45卷 17313-17319页

作者： zhang, Zewu Li, Shijia Bu, Xiaohai Dai, Yifan Wang, Jingxi Bao, xuwen Wang, Tong Nanjing Inst Technol Sch Mat Sci & Engn Nanjing 21167 Jiangsu Peoples R China Jiangsu Key Lab Adv Struct Mat & Applicat Technol Nanjing 21167 Jiangsu Peoples R China Southeast Univ Sch Mat Sci & Engn Nanjing 21189 Jiangsu Peoples R China

The design and construction of noble-metal free electrocatalysts with high efficiency for both hydrogen and oxygen evolution reactions holds promise for advancing the production of H-2 fuels through the overall water splitting process. Herein, we report a novel hollow near-spherical superstructure of a cobalt sulfide electrocatalyst (h-CoxSy) via the accumulation of two-dimensional cobalt sulfide nanosheets in a sulfurization-pyrolysis process of hollow ZIF-67. Benefiting from the porous characteristics, a unique hollow superstructure and saw-toothed edges derived from the hollow ZIF-67 precursor, the h-CoxSy exhibited outstanding bifunctional electrocatalytic performances, with overpotentials of 320 and 295 mV to achieve 10 mA cm(-2) for the OER and HER, respectively. When h-CoxSy was employed as both the anode and cathode for overall water splitting, a current density of 10 mA cm(-2) can be obtained at a cell voltage of 1.88 V, along with impressive operation stability.

关键词： Cobalt compounds

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Theoretical study on mechanical and electronic properties of ternary diborides Sc0.5V0.5B2, Sc0.5Nb0.5B2 and Sc0.5Ta0.5B2

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MATERIALS TODAY COMMUNICATIONS 2023年 35卷

作者： Xie, Quanmin Yao, Yingkang Liu, xuwen Sun, Jinshan zhang, Zheng Chen, Lei Jianghan Univ State Key Lab Precis Blasting Wuhan 430056 Peoples R China Jianghan Univ Hubei Key Lab Blasting Engn Wuhan 430056 Peoples R China Baoji Univ Arts & Sci Coll Phys & Optoelect Technol Baoji 721016 Peoples R China Sichuan Jiaoda Engn Detect & Consulting Co Ltd Chengdu Peoples R China Jianghan Univ State Key Lab Precis Blasting Wuhan 430056 Peoples R China

Owing to the high thermal stability and superior mechanical properties, the transition-metal (TM) diborides have been proved to be a class of promising hard materials used as protective films. In the present work, a new type of ternary diborides Sc0.5V0.5B2, Sc0.5Nb0.5B2 and Sc0.5Ta0.5B2 alloyed by doping the TM scandium into VB2, NbB2 and TaB2 are systematically investigated using first-principle density functional theory (DFT) calculations. These ternary systems all possess higher hardness of up to about 45 GPa relative to their parent binary diborides ScB2, VB2, NbB2 and TaB2, suggesting they could be viewed as promising candidates of superhard materials. An improved structure searching approach was employed to explore the potential stable and metastable structures of them under the pressure of 0 similar to 100 GPa. The hexagonal AlB2-type structure (P6/mmm) was confirmed to be their ambient phase, which can retain the stability up to 100 GPa. Meanwhile, their ideal tensile and pure shear strengths all reached about 40 GPa, demonstrating their superhard nature. The origin of the enhanced mechanical properties of these ternary systems was resolved in details by electronic analysis at fundamental level. Thanks to the introduction of the Sc, the p-d interactions between TM and B atoms are greatly enhanced. This remarkable enhancement of p-d coupling hybridization together with the pure covalent B-B bonds results in their high hardness property.

关键词： Transition-metal diborides Superhard material First-principles Ideal strength Electronic structure

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Expression of a plastid-localized sugar transporter in the suspensor is critical to embryogenesis

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PLANT PHYSIOLOGY 2021年第3期185卷 1021-1038页

作者： zhang, Mengmeng Xu, xuwen Zheng, Yueping zhang, Yan Deng, Xiangxiong Luo, Suan Wu, Qiuping Xu, Juan zhang, Shuqun Nanjing Agr Univ Coll Plant Protect Key Lab Plant Immun Nanjing 210095 Peoples R China Zhejiang Univ Coll Life Sci State Key Lab Plant Physiol & Biochem Hangzhou 310058 Peoples R China Univ Missouri Div Biochem Columbia MO 65211 USA

Plant growth and development rely on sugar transport between source and sink cells and between different organelles. The plastid-localized sugar transporter GLUCOSE-6-PHOSPHATE TRANSLOCATER1 (GPT1) is an essential gene in Arabidopsis (Arabidopsis thahana). Using a partially rescued gpt1 mutant and cell-specific RNAi suppression of GPT1, we demonstrated that GPT1 is essential to the function of the embryo suspensor and the development of the embryo. GPT1 showed a dynamic expression/accumulation pattern during embryogenesis. Inhibition of GPT1 accumulation via RNA1 using a suspensor-specific promoter resulted in embryos and seedlings with defects similar to auxin mutants. Loss of function of GPT1 in the suspensor also led to abnormal/ectopic cell division in the lower part of the suspensor, which gave rise to ectopic embryo, resulting in twin embryos in some seeds. Furthermore, loss of function of GPT1 resulted in vacuolar locali- zation of PIN-FORMED1 (PIN1) and altered DRS auxin activity. Proper localization of PIN1 on the plasma membrane is essential to polar auxin transport and distribution, a key determinant of pattern formation during embryogenesis. Our findings suggest that the function of GPT1 in the embryo suspensor is linked to sugar and/or hormone distribution between the embryo proper and the maternal tissues, and is important for maintenance of suspensor identity and function during embryogenesis.

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NUMERICAL SIMULATION AND PARAMETRIC ANALYSIS OF THE WALL STRAIN DISTRIBUTION OF VERTICALLY PLACED METAL HYDRIDE BASED HYDROGEN STORAGE CONTAINER 23

NUMERICAL SIMULATION AND PARAMETRIC ANALYSIS OF THE WALL STR...

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23rd World Hydrogen Energy Conference: Bridging Continents by H2, WHEC 2022

作者： Cao, Shuaijie Yin, xuwen Yang, Fusheng Jiang, Lijun Wu, Yuanfang Wu, Zhen zhang, Zaoxiao Xi'an Jiaotong University School of Chemical Engineering and Technology Shaanxi Xi'an China Xinjiang University School of Mechanical Engineering Xinjiang Uygur Autonomous Regions Urumqi China Co. LTD Beijing China

ISBN: (纸本)9786250008430

Pulverization, settling and agglomeration, and the consequent densification may occur for metal hydride particles during the charge-discharge cycles, which will affect the wall strain of their container for hydrogen storage. In order to study the effects of different factors on the wall strain of metal hydride hydrogen storage vessel, a reaction-thermal-mechanical coupling model for LaNi5 alloy was modified with regard to some relevant parameters, by which sensitivity analysis was conducted. Finally, the strain distribution along the height of reactor filling Mg2Ni was predicted by the model and compared with experimental results reported in literature. © 2022 Proceedings of WHEC 2022 - 23rd World Hydrogen Energy Conference: Bridging Continents by H2. All rights reserved.

关键词： Hydrogen storage

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Attribute Reduction Method Using Adaptive Genetic Algorithm and Particle Swarm Optimization 2021

Attribute Reduction Method Using Adaptive Genetic Algorithm ...

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7th International Conference on Computing and Artificial Intelligence, ICCAI 2021

作者： Wu, Shangzhi zhang, Fan Wang, xuwen Xia, Ning Northwest Normal University College of Computer Science and Engineering Lanzhou China

ISBN: (纸本)9781450389501

Attribute reduction is one of the core contents in rough set knowledge discovery, how to find the minimal attribute reduction, proposes an attribute reduction method using adaptive Genetic Algorithm(GA) and Particle Swarm Optimization(PSO). On the basis of the condition attributes for decision attribute support degree, the method reset the fitness function, can dynamically adjust the parameters of the function, thus to ensure the obtained results for minimal reduction, combined with the genetic algorithm of adaptive crossover and mutation operation, to ensure that the particles in the feasible solution can be fully retain and use, the method to strengthen the local search ability at the same time, but also keep the global search ability. Experiments results show that the method has obvious advantages in solving the minimum attribute reduction. © 2021 ACM.

关键词： Genetic algorithms

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