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External wall structure of green rural houses in Daqing, China, based on life cycle and ecological footprint theories

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Frontiers of Architectural Research 2015年第3期4卷 212-219页

作者： Hong Jin Wei ling School of Architecture Harbin Institute of Technology Harbin 150006 China

Daqing is situated in one of the severely cold resions of China. The livin8 environment in this region is extremely poor because of the harsh climate and the backward economy. The external wall is an important component of the external envelope of buildings, and it greatly contributes to the indoor thermal environment. By taking the external wall as the research object, this study summarizes the characteristics of the external wall structure and analyzes the common materials used in existing rural residences. Specifically, we combine life cycle theory and ecological footprint （EF） theory and introduce the green external wall structure, as well as its application in practice, in accordance with the local ecosystem. Results show that anecotosical residence offers a better environment and greater economic benefits than a traditional residence. The annual energy consumption, C02 consumption, and EF of the ecological residence in this study are lower than those of the traditional residence by 69.61%, 17.5 t, and 99.47%, respectively.

关键词： Life cycle assessment Ecological footprint Green rural house External watt

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铜吹炼转炉渣主要元素分布及其矿相特征

中南大学学报（自然科学版） 2018年第11期49卷 2649-2655页

作者：杜柯王成彦王玲北京科技大学冶金与生态工程学院北京100083

通过X线衍射分析、化学物相分析、化学多元素分析等方法,并结合显微镜观测,研究铜吹炼转炉渣中主要元素分布规律及其矿相的产出特征。研究结果表明:赞比亚谦比希铜冶炼公司的铜吹炼转炉渣中的铁、铜和钴质量分数较高,质量分数分别为47.8... 详细信息

通过X线衍射分析、化学物相分析、化学多元素分析等方法,并结合显微镜观测,研究铜吹炼转炉渣中主要元素分布规律及其矿相的产出特征。研究结果表明:赞比亚谦比希铜冶炼公司的铜吹炼转炉渣中的铁、铜和钴质量分数较高,质量分数分别为47.84%,3.60%与2.52%;80.94%的铜以金属态存在,12.71%以硫化态存在;钴与铁主要呈氧化态富集,钴在磁铁矿相与铁橄榄石相中的质量分数分别为40.71%和49.35%,而铁质量分数分别为56.34%,41.94%;转炉渣中主要物相为铁橄榄石相与磁铁矿相,质量分数分别为47.50%与38.91%;含铜物相主要为金属铜相与辉铜矿相,质量分数分别2.64%与1.17%;此外,渣中含有9.78%的玻璃相。铁橄榄石相与磁铁矿相相互包裹、夹杂,构成渣的基底物相;辉铜矿相、金属铜相及玻璃相夹杂在磁铁矿、铁橄榄石晶粒间,或被二者包裹;钴与铁元素的面分布一致,铁与氧、硅元素的面分布均一致,铜与硫元素的面分布一致。

关键词：铜吹炼转炉渣化学物相分析矿相特征面分布

Trends of Urban Air Pollution in Zhengzhou City in 1996-2008

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Chinese Geographical Science 2012年第4期22卷 402-413页

作者： du Xile LU Changhe WANG Hairong MA Jianhua Institute of Geographic Sciences and Natural Resources Research Chinese Academy Sciences Beoing 100101 China' Graduate University of Chinese Academy of Sciences Beijing 100049 China The Second Battalion ofNon-ferrous Metal Geology and Mineral Resources Bureau Zhengzhou 450016 China Institute ofNatural Resources and Environmental Science Henan University Kaifeng 475004 China)

Urban air pollution is a commonly concerned environmental problem in the world. Identification of air quality trend using long-term monitoring data is helpful to understand the effectiveness of pollution control strategies. This study, using data from six monitoring stations in Zhengzhou City, analyzed the changing trend in concentrations of SO2, NOJNO2 and TSP/PM10 in 1996-2008, based on non-parametric Mann-Kendall test and Sen＇s slope estimator, and evaluated the comprehensive air pollution level using Multi-Pollutant Index （MPI）. It was found that the concen- tration of each pollutant exceeded obviously the World Health Organization （WHO） guideline value, but the changing trend varied： SO2 and NO2 were significantly increased mainly due to an increase in coal consumption and vehicle number, while NOx, TSP and PM10 decreased. The air pollution was serious, and differed markedly among the three functional regions： it is the most severe in the Industrial and Residential Area （IRA）, followed by the Transportation Hub and Business District （THBD）, and then the High-tech, Cultural and Educational Area （HCEA）. Different from NO2 concentration that had a similar change trend/rate among the function regions, the change rate of PM10 concentra- tion differed spatially, decreased much more obviously in THBD than other two regions. For the whole city, the com- prehensive air pollution level declined gradually, illustrating that the air quality in Zhengzhou was improved in the last decade.

关键词： urban air pollution Mann-Kendall test Sen's method Multi-Pollutant Index (MPI) Zhengzhou

Application of Zero-Watermarking for Medical Image in Intelligent Sensor Network Security

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Computer Modeling in Engineering & Sciences 2023年第7期136卷 293-321页

作者： Shixin Tu Yuanyuan Jia Jinglong du Baoru Han Medical Data Science Academy College of Medical InformaticsChongqing Medical UniversityChongqing400016China

The field of healthcare is considered to be the most promising application of intelligent sensor ***,the security and privacy protection ofmedical images collected by intelligent sensor networks is a hot problem that has attracted more and more ***,digital watermarking provides an effective method to solve this *** order to improve the robustness of the medical image watermarking scheme,in this paper,we propose a novel zero-watermarking algorithm with the integer wavelet transform(IWT),Schur decomposition and image block ***,we first use IWT to extract low-frequency information and divide them into non-overlapping blocks,then we decompose the sub-blocks by Schur *** that,the feature matrix is constructed according to the relationship between the image block energy and the whole image *** the same time,we encrypt watermarking with the logistic chaotic position ***,the zero-watermarking is obtained by XOR operation with the encrypted *** indexes of peak signal-to-noise ratio,normalization coefficient(NC)and the bit error rate(BER)are used to evaluate the robustness of the *** to the experimental results,most of the NC values are around 0.9 under various attacks,while the BER values are very close to *** experimental results show that the proposed algorithm is more robust than the existing zero-watermarking methods,which indicates it is more suitable for medical image privacy and security protection.

关键词： Intelligent sensor network medical image zero-watermarking integer wavelet transform schur decomposition

Higher Order Fractional Differentiability for the Stationary Stokes System

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Acta Mathematica Sinica,English Series 2023年第1期39卷 13-29页

作者： ling Wei MA Zhen Qiu ZHANG Qi XIONG School of Mathematical Sciences Tianjin Normal UniversityTianjin 300387P.R.China School of Mathematical Sciences and LPMC Nankai UniversityTianjin 300071P.R.China School of Mathematical Sciences Nankai UniversityTianjin 300071P.R.China

This paper focuses on the higher order fractional differentiability of weak solution pairs to the following nonlinear stationary Stokes system{div A(x-du)-■π=divF,inΩdivu=0,inΩ.In terms of the difference quotient method,our first result reveals that if F∈B_(p,***)^(β)(Ω,R^(n))for p=2 and 1≤q≤2n/n-2β,then such extra Besov regularity can transfer to the symmetric gradient du and its pressureπwith no losses under a suitable fractional differentiability assumption on x■A(x,ξ).Furthermore,when the vector field A(x,du)is simplified to the full gradient■u,we improve the aforementioned Besov regularity for all integrability exponents p and q by establishing a new Campanato-type decay estimates for(■u,π).

关键词： Higher order fractional differentiability Stokes system Besov spaces

Synthesis and Release Behavior of a Hybrid of Camptothecin Intercalated Dodecyl Sulfate Modified Layered Double Hydroxide

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Chemical Research in Chinese Universities 2014年第1期30卷 137-143页

作者： LI Yan du Na HOU Wanguo LIU Shaojie Key Laboratory of Colloid & Interface Chemistry Ministry of EducationShandong University Jinan 250100 P. R. China National Engineering Research Center for Colloidal Materials Shandong University Jinan 250100 P. R. China

The intercalation of a non-ionic and poorly water-soluble drug,camptothecin（CPT）,into dodecyl sulfate （DS） modified layered double hydroxide（LDH） was carried out via a secondary intercalation method to obtain a CPT-DS-LDH *** in vitro CPT release eFxaminations from the hybrid show that the hybrid can well control the release of CPT,which indicates that the hybrid is a potential drug controlled-release ***,the intercalation kinetics of CPT into the DS modified LDH fits for the pseudo-second-order *** the release kinetic process of CPT from the CPT-DS-LDH hybrid at pH=4.8 can be described with pseudo-first-order model,while that at pH=7.2 can be described with both pseudo-first-order model and pseudo-second-order ***,the release mechanism of CPT from the CPT-DS-LDH hybrid was discussed.

关键词： Layered double hydroxide(LDH) Camptothecin Hybrid Controlled release

Al^(3+)/graphene composites for electrochemical detection of DNA cleavage

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Science China Chemistry 2013年第9期56卷 1325-1330页

作者： du Meng KONG QianQian YANG Tao JIAO Kui College of Chemistry and Molecular Engineering Qingdao University of Science and Technology

Herein, we present the electrochemical co-deposition of Al3+/graphene composites directly from an aqueous mixture containing graphene oxide (GO) and Al3+. The obtained Al3+/graphene composites with good electrochemical activity were regarded as an appropriate immobilization platform for double-stranded DNA (dsDNA). The nontoxic redox probe xanthurenic acid (XA) was successfully applied to recognize single-stranded DNA and dsDNA. We illustrated that the scission of dsDNA caused by GO combining with some metal ions could be detected by monitoring the electrochemical signals of XA.

关键词： graphene DNA cleavage electrochemical deposition xanthurenic acid

Integrated gradient tissue-engineered osteochondral scaffolds:Challenges,current efforts and future perspectives

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Bioactive Materials 2023年第2期20卷 574-597页

作者： Xiaolian Niu Ning Li Zhipo du Xiaoming Li Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education Beijing Advanced Innovation Center for Biomedical EngineeringSchool of Biological Science and Medical EngineeringBeihang UniversityBeijing100083China Department of Orthopedics The Fourth Central Hospital of Baoding CityBaoding072350China

The osteochondral defect repair has been most extensively studied due to the rising demand for new therapies to diseases such as *** engineering has been proposed as a promising strategy to meet the demand of simultaneous regeneration of both cartilage and subchondral bone by constructing integrated gradient tissue-engineered osteochondral scaffold(IGTEOS).This review brought forward the main challenges of establishing a satisfactory IGTEOS from the perspectives of the complexity of physiology and microenvironment of osteochondral tissue,and the limitations of obtaining the desired and required ***,we comprehensively discussed and summarized the current tissue-engineered efforts to resolve the above challenges,including architecture strategies,fabrication techniques and in vitro/in vivo evaluation methods of the ***,we highlighted the advantages and limitations of various fabrication techniques of IGTEOS,and common cases of IGTEOS ***,based on the above challenges and current research progress,we analyzed in details the future perspectives of tissue-engineered osteochondral construct,so as to achieve the perfect reconstruction of the cartilaginous and osseous layers of osteochondral tissue *** comprehensive and instructive review could provide deep insights into our current understanding of IGTEOS.

关键词： Osteochondral tissue engineering Integrated gradient tissue-engineered osteochondral scaffold(IGTEOS) Tissue-engineered strategies Fabrication techniques Evaluation

Target models and waveform design for detection in MIMO radar

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Science China(Information Sciences) 2014年第1期57卷 268-279页

作者： TANG Jun LUO Jun TANG Bo du JinSong Electronic Engineering Department of Tsinghua University China Marine Development & Research Center Shenyang Institute of Automation Chinese Academy of Sciences

In this paper,we propose a general target model for multiple-input multiple-output(MIMO)*** types of targets are *** each type of target,we develop a corresponding optimum waveform designing method to optimize detection *** on Chernof-Stein lemma,we use relative entropy as the performance *** show that the optimum waveform designing method can obtain better detection performance than traditional orthogonal waveform designing method.

关键词： MIMO radar waveform designing relative entropy