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盐酸预处理对浒苔基活性炭电化学性能的影响

化工进展 2022年第12期41卷 6454-6460页

作者：王艺霖李诗杰山东建筑大学热能工程学院山东济南250000

传统工艺制备的活性炭微孔足够,但中孔、大孔含量缺乏,导致其用作超级电容器电极材料时电化学性能水平较低。为解决这一问题,采用盐酸对炭化前浒苔原料进行预处理。酸处理去除了原料中大部分的杂质金属,其中,海藻酸钙与盐酸发生化学反... 详细信息

传统工艺制备的活性炭微孔足够,但中孔、大孔含量缺乏,导致其用作超级电容器电极材料时电化学性能水平较低。为解决这一问题,采用盐酸对炭化前浒苔原料进行预处理。酸处理去除了原料中大部分的杂质金属,其中,海藻酸钙与盐酸发生化学反应形成了蛋壳初始孔,酸溶性碱金属离子与盐酸发生置换反应形成了无规则初始孔隙,明显增加了活性炭的中孔含量。实验结果表明:盐酸预处理后的活性炭比表面积明显增加,由2273m~2/g增至3166m~2/g,孔容由2.10cm^(3)/g增至3.82cm^(3)/g,中孔率显著提高,改善了孔结构的连通性,促进了电解质离子在材料内部的扩散;当电流密度为0.1A/g时,经过酸洗处理的活性炭比电容高达359F/g,比原样活性炭比电容的293F/g增长了23%,超级电容器等效串联电阻很小,表现出良好的电化学性能。

关键词：生物质活性炭超级电容器盐酸预处理电化学性能

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AAC算法的大气校正复合改进算法

遥感学报 2016年第3期20卷 450-458页

作者：尹梅田淑芳李士杰中国地质大学(北京)地球科学与资源学院北京100083

利用模拟数据,评价Autonomous Atmospheric Compensation(AAC)算法的抗噪性,认为AAC算法的抗噪性较弱。基于TASI实测数据,利用AAC算法开展反演计算时,计算结果呈现出多样性问题。结合In-scene Atmospheric Compensation(ISAC)算法中黑体像元的标定方法,提出了一种复合改进算法。首先,利用ISAC算法反演的大气透过率和路径辐射,重新计算AAC算法中大气透过率之比(Tr)和相邻两强弱吸收通道的路径辐射之差(Pd),再次,运用经验公式获得稳定的大气反演结果(大气透过率和路径辐射),有效解决了计算结果多样性的问题。利用复合改进算法,开展的温度与发射率分离实验,证明反演得到的发射率波谱更接近野外实测波谱。

关键词： AAC ISAC 复合 TASI 抗噪性

互联网平台企业定价策略与用户获取——来自中国外卖行业的经验证据

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经济研究 2023年第6期58卷 84-101页

作者：李世杰南开大学经济学院 300071

互联网市场的“赢家通吃”特征,依赖于平台定价策略优先推动平台用户规模增长。本文梳理了互联网平台定价策略的研究文献,考察互联网平台定价水平的分布特征,探讨阶梯式定价策略及其产业实践对平台用户规模的影响机理;结合外卖平台的产... 详细信息

互联网市场的“赢家通吃”特征,依赖于平台定价策略优先推动平台用户规模增长。本文梳理了互联网平台定价策略的研究文献,考察互联网平台定价水平的分布特征,探讨阶梯式定价策略及其产业实践对平台用户规模的影响机理;结合外卖平台的产业实践数据,采用条件推断树模型等分析策略予以验证,解析阶梯式定价策略本质特征。研究发现:互联网平台企业阶梯式定价策略将消费者划分在零价格、象征性价格及盈利性价格的不同分组中,以期形成蓄水池式的用户规模梯队结构,进而实现扩大用户规模、培育消费者支付意愿、掠夺消费者剩余等策略性目标联动,既能维持庞大用户规模,又能获取稳定的平台利润。该定价机制与价格歧视理论的本质差异在于:阶梯式定价策略通过平台定价析出平台用户分组;价格歧视理论通过平台用户分组设置分组定价。

关键词：互联网平台企业阶梯式定价策略平台用户规模外卖行业

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调压室胸墙稳定性分析与加固措施研究

自然灾害学报 2021年第1期30卷 109-115页

作者：郭涛李世杰昆明理工大学建筑工程学院工程力学系云南昆明650500 中国电建集团昆明勘测设计研究院有限公司云南昆明650051

调压室是水电站压力水道系统中的一项重要建筑物,其结构稳定性直接影响到下游电站的安全稳定运行,工程上一般采用薄壁圆柱筒法求其应力状态。本文针对湖北某已建水电站调压室胸墙由于下游支撑较弱,闸门胸墙变形及拉应力较大等问题。在... 详细信息

调压室是水电站压力水道系统中的一项重要建筑物,其结构稳定性直接影响到下游电站的安全稳定运行,工程上一般采用薄壁圆柱筒法求其应力状态。本文针对湖北某已建水电站调压室胸墙由于下游支撑较弱,闸门胸墙变形及拉应力较大等问题。在考虑外围基岩、胸墙下部沥青杉木板弹性支撑和初始地应力场的基础上,采用数值方法对调压室及其外围基岩进行了整体稳定性分析、现有配筋校核和加固措施研究。结果表明,应将最高涌浪水位作为该调压室加固的控制工况。提出了相应的加筑肋墙或圈梁的加固方案,并从避免胸墙变形过大以保证闸门顺利启闭、降低局部应力集中以减缓混凝土破损等角度出发,对加固后的效果进行了分析讨论。通过对比分析,建议采取H型钢圈梁的加固方案,该方案不仅避免了对原结构的较大改动,还保证了下游厂房的稳定运行和自身结构安全。计算成果为工程项目的加固实施提供了技术依据,同时也为类似工程建设提供了借鉴。

关键词：调压室加固闸门胸墙涌浪工况有限元法稳定性分析

Hydro-Chemical Processes in Lake Qinghai throughout Climate Warming: In Situ Investigations of the Largest Lake in China

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Natural Science 2016年第12期8卷 574-590页

作者： Chuanfang Jin shijie li Hongliang Zhang Jifeng liu Wei Chen Yongjian Jiang State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences Nanjing China State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing China State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang China School of Resources Environment and Tourism Anyang Normal University Anyang China Yellow River Conservancy Commission of the Ministry of Water Resources Zhengzhou China Key Laboratory of Economic Stratigraphy and Palaeogeography Nanjing Institute of Geology and Palaeontology Chinese Academy of Sci-ences Nanjing China School of Resources and Environment Linyi University Linyi China

In the wake of climate warming, the water level of Lake Qinghai has been continuously and rapidly declining during the past decades, causing the regional government and citizens to worry about its future as a water resource. To understand the lake evolution process, the hydro-chemical characteristics of Lake Qinghai were investigated in August of 2008. The results show that Na+ and Cl- are the dominant cations and anions in the lake water, respectively, and hydrochemistry type is Cl-- Na+ with an obvious characteristic of a saline lake. The Gibbs plot illuminates that evaporation/crystallization is responsible for the chemical composition of the lake water. The variation in hydro-chemical regime might be attributed to the reduced lake levels between 1960s and 2000s. The lake level significantly correlated with the precipitation and evaporation in the Lake Qinghai catchment. In addition, changes of the lake level in the future are simulated according to climate warming scenarios from the IPCC report. The simulated results suggest that the lake level could rise again in the following decades due to the increased precipitation under the climate warming conditions, which is already a trend in the lake level observation data.

关键词： Hydrochemical Process Salinity Spatial Distribution and Temporal Variation Lake Level Changes Lake Qinghai

Accelerated Rendering and Fast Reconstruction of EEG Data in Real-Time BCI

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Accelerated Rendering and Fast Reconstruction of EEG Data in...

2015年中国智能自动化学术会议

作者： Ning Wang Peng Lu lipeng Zhang shijie li Hanghang Hu The 27th Research Institute of China Electronics Technology Group Corporation School of Electric Engineering Zhengzhou University

In real-time BCI(Brain Computer Interface), the ITRs(Information Transmission Rates) is one of the most common criteria for evaluating the performance of the whole system, and one of the key factors is the duration of one single trial. This paper aims at improving the ITRs by decreasing the *** rendering is used for drawing raw EEG(Electroencephalogram) data in presentation thread, and thread scheduling based on adaptive one-sided fuzzy inference and the mechanism of mutual exclusion and synchronization with semaphore is adopted to recombine intervening data blocks in reconstruction thread.

关键词： Real-time BCI The mechanism of mutual exclusion EEG data Thread scheduling Fuzzy inference

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利用少量氧化镍负载提高活性炭比电容

材料导报 2021年第4期35卷 4012-4016页

作者：李诗杰韩奎华山东建筑大学热能工程学院济南250101 山东大学能源与动力工程学院济南250012

为提高活性炭电极材料的比电容,本实验采用低浓度碱式碳酸镍溶液对活性炭进行氧化镍表面负载,利用碱式碳酸镍的热解特性,在引入赝电容的同时,减小负载对活性炭原有孔隙结构的影响,从而在引入赝电容的同时较好地保留活性炭的双电层电容... 详细信息

为提高活性炭电极材料的比电容,本实验采用低浓度碱式碳酸镍溶液对活性炭进行氧化镍表面负载,利用碱式碳酸镍的热解特性,在引入赝电容的同时,减小负载对活性炭原有孔隙结构的影响,从而在引入赝电容的同时较好地保留活性炭的双电层电容。本实验还研究了不同数量氧化镍负载对活性炭孔结构和电化学性能的影响。实验结果表明:氧化镍负载改性后,活性炭在较好保留了原有孔隙结构的基础上,还在孔结构表面均匀负载了大量的纳米级氧化镍,改性后活性炭电极材料引入了赝电容,活性炭的比电容性能得到明显改善,且随着氧化镍负载数量的增多,活性炭比电容性能逐渐提高。

关键词：活性炭氧化镍双电层电容赝电容比电容

S-Scheme photocatalyst TaON/Bi_(2)WO_(6) nanofibers with oxygen vacancies for efficient abatement of antibiotics and Cr(VI):Intermediate eco-toxicity analysis and mechanistic insights

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Chinese Journal of Catalysis 2022年第10期43卷 2652-2664页

作者： shijie li Mingjie Cai Yanping liu Chunchun Wang Kangle Lv Xiaobo Chen Key Laboratory of Health Risk Factors for Seafood of Zhejiang Province National Engineering Research Center for Marine AquacultureCollege of Marine Science and TechnologyZhejiang Ocean UniversityZhoushan 316022ZhejiangChina Institute of Innovation&Application Zhejiang Ocean UniversityZhoushan 316022ZhejiangChina Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education South-Central Minzu UniversityWuhan 430074HubeiChina Department of Chemistry University of Missouri-Kansas CityMO 64110USA

Enlightened by natural photosynthesis,developing efficient S-scheme heterojunction photocatalysts for deleterious pollutant removal is of prime importance to restore ***,novel TaON/Bi_(2)WO_(6) S-scheme heterojunction nanofibers were designed and developed by in-situ growing Bi_(2)WO_(6) nanosheets with oxygen vacancies(OVs)on TaON *** to the efficiently spatial charge disassociation and preserved great redox power by the unique S-scheme mechanism and OVs,as well as firmly interfacial contact by the core-shell 1D/2D fibrous hetero-structure via the in-situ growth,the optimized TaON/Bi_(2)WO_(6) heterojunction unveils exceptional visible-light photocatalytic property for abatement of tetracycline(TC),levofloxacin(LEV),and Cr(Ⅵ),respectively by 2.8-fold,1.0-fold,and 1.9-fold enhancement compared to the bare Bi_(2)WO_(6),while maintaining satisfactory ***,the systematic photoreaction tests indicate Ta-ON/Bi_(2)WO_(6) has the high practicality in the elimination of pollutants in aquatic *** degradation pathway of tetracycline and intermediate eco-toxicity were determined based on HPLC–MS combined with QSAR calculation,and a possible photocatalytic mechanism was *** work provides a guideline for designing high-performance TaON-based S-scheme photocatalysts with defects for environment protection.

关键词： TaON/Bi_(2)WO_(6) S-Scheme heterojunction Electrospinning Oxygen vacancy Antibiotic degradation Cr(Ⅵ)reduction

Identification of publication characteristics and research trends in the management of gallbladder cancer

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iliVER 2022年第2期1卷 127-138页

作者： Jiasheng Cao Jiahao Hu Jiliang Shen Bin Zhang Win Topatana shijie li Tianen Chen Sarun Jeungpanich Yitong Tian Ziyi Lu Shuyou Peng Xiujun Cai Mingyu Chen Department of General Surgery Sir Run-Run Shaw HospitalZhejiang UniversityHangzhou 310016Zhejiang ProvinceChina Zhejiang University School of Medicine Zhejiang UniversityHangzhou 310058Zhejiang ProvinceChina Department of General Surgery The Second Affiliated HospitalZhejiang UniversityHangzhou 310009Zhejiang ProvinceChina

Background:To date,no comprehensive analysis of gallbladder cancer(GBC)management has been *** aimed to identify the publication characteristics and research trends in managing GBC over the past three ***:We selected the 100 most cited articles and performed a bibliometric analysis to summarize the publication characteristics,explore research hotspots,and identify research trends in the management of ***:The total citations of the included articles ranged from 123 to *** II(2001–2010)yielded the highest number of included articles,whereas the lowest was in Period III(2011–2020).The United States and Japan published the most papers,in which the Memorial Sloan–Kettering Cancer Center and Nagoya University were the leading institutions,*** most influential authors were Blumgart LH and Fong YM from the United *** among countries,institutions,and authors was *** Annals of Surgery contributed the most articles with the highest number of total *** most researched topic was surgery,followed by systemic therapy and adjuvant *** Period I,the percentage of surgery-related publications continuously decreased(Periods II and III versus Period I,both p<0.001),with a concomitant increase in those of adjuvant therapy(Period III versus Period I,p=0.004)and systemic therapy(Period II versus Period I,p=0.004;Period III versus Period I,p=0.002).Conclusions:Surgery remains the preferred treatment,while there is a tendency toward adjuvant and systemic therapy in GBC *** increase in local and international collaboration for managing GBC is required.

关键词： Gallbladder cancer Surgery Adjuvant therapy Systemic therapy Bibliometric analysis