检索结果-南通市图书馆

Proton induced X-ray emission (PIXE) analysis of sources of porcelain body of Ru Guan and Jun Guan porcelains

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2006年第4期49卷 411-420页

作者： LI Guoxia1, ZHAO Weijuan1, LI Rongwu2, SUN Hongwei1, GUO Min1, WANG Yanfang1, LIU Hui1, ZHAO Qingyun3, SUN Xinmin3, ZHAO Wenjun3 & CHENG Huansheng4 1. Faculty of Physical Engineering, Zhengzhou University, Zhengzhou 450052, China 2. Department of Physics, Beijing Normal University, Beijing 100875, China 3. Institute of Cultural Relic and Archaeology of Henan Province, Zhengzhou 450000, China 4. Institute of Modern Physics, Fudan University, Shanghai 200433, China Faculty of Physical Engineering Zhengzhou University Zhengzhou China Department of Physics Beijing Normal University Beijing China Institute of Cultural Relic and Archaeology of Henan Province Zhengzhou China Institute of Modern Physics Fudan University Shanghai China

34 samples of Ru Guan porcelain body and 50 samples of Jun Guan porcelain body (both kinds being in different body colors) were selected with the purpose of finding out the source of raw materials and their classification relationship so as to search for ways of non-destructive discrimination. Proton induced X-ray emission (PIXE) has been applied to these samples to determine their chemical elements. The data of seven major chemical elements collected from these samples were further studied through fuzzy cluster analysis. Results indicate that the origin of raw materials of Jun Guan porcelain body samples is comparatively more concentrated in certain places, while that of Ru Guan porcelain body samples is scattered about. The places of origin of raw materials of the majority of Ru Guan and Jun Guan porcelain body samples have something in common, but some differences still exist. It might be an important way for non-destructive discrimination among Ru Guan and Jun Guan porcelains by combining PIXE with fuzzy cluster analysis.

关键词： Ru Guan and Jun Guan porcelain, source of porcelain body, PIXE, fuzzy cluster analysis, non-destructive discrimination.

MobSafe:Cloud Computing Based Forensic analysis for Massive Mobile Applications Using Data Mining

在线全文

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2013年第4期18卷 418-427页

作者： Jianlin Xu Yifan Yu Zhen Chen Bin Cao Wenyu Dong Yu Guo Junwei Cao Department of Computer Science and Technology and Tsinghua National Laboratory for Information Science and Technology (TNList) Tsinghua University Department of Electronic Engineering and Tsinghua National Laboratory for Information Science and Technology (TNList) Tsinghua University Research Institute of Information Technology and Tsinghua National Laboratoryfor Information Science and Technology (TNList) Tsinghua University Department of Computer Science and Technology Research Institute of Information Technology and Tsinghua National Laboratory for Information Science and Technology (TNList)Tsinghua University

With the explosive increase in mobile apps, more and more threats migrate from traditional PC client to mobile device. Compared with traditional Win＋Intel alliance in PC, Android＋ARM alliance dominates in Mobile Internet, the apps replace the PC client software as the major target of malicious usage. In this paper, to improve the security status of current mobile apps, we propose a methodology to evaluate mobile apps based on cloud computing platform and data mining. We also present a prototype system named MobSafe to identify the mobile app＇s virulence or benignancy. Compared with traditional method, such as permission pattern based method, MobSafe combines the dynamic and static analysis methods to comprehensively evaluate an Android app. In the implementation, we adopt Android Security Evaluation Framework （ASEF） and Static Android analysis Framework （SAAF）, the two representative dynamic and static analysis methods, to evaluate the Android apps and estimate the total time needed to evaluate all the apps stored in one mobile app market. Based on the real trace from a commercial mobile app market called AppChina, we can collect the statistics of the number of active Android apps, the average number apps installed in one Android device, and the expanding ratio of mobile apps. As mobile app market serves as the main line of defence against mobile malwares, our evaluation results show that it is practical to use cloud computing platform and data mining to verify all stored apps routinely to filter out malware apps from mobile app markets. As the future work, MobSafe can extensively use machine learning to conduct automotive forensic analysis of mobile apps based on the generated multifaceted data in this stage.

关键词： Android platform mobile malware detection cloud computing forensic analysis machine learning redis key-value store big data hadoop distributed file system data mining

Design and analysis of extended depth of focus metalenses for achromatic computational imaging

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2020年第10期8卷 1613-1623页

作者： LUOCHENG HUANA JAMES WHITEHEAD SHANE COLBURN ARKA MAJUMDAR Department of Electrical and Computer Engineering Urniversity of WashingtonSeattleWashington 98195USA Department of Physics University of WashingtonSeatteWashington 98195USA

Metasurface optics have demonstrated vast potential for implementing traditional optical components in an ultracompact and lightweight form ***,however,suffer from severe chromatic aberrations,posing serious limitations on their practical *** approaches for circumventing this involving dispersion engineering are limited to small apertures and often entail multiple scatterers per unit cell with small feature ***,we prescnt an alternative technique to mitigatc chromatic aberration and demonstrate high-quality,full-color imaging using extended depth of focus(EDOF)metalenses and computational *** EDOF metalenses have relied on cubic phase masks,where the image quality suffers from asymmetric *** we demonstrate the use of rotationally symmetric masks,including logarithmic-aspherical,and shifted axicon masks,to mitigate this *** work will inspire further development in achromatic metalenses beyond dispersion engineering and hybrid optical-digital metasurface systems.

关键词： chromatic dispersion optics

Gene dysregulation analysis builds a mechanistic signature for prognosis and therapeutic benefit in colorectal cancer

在线全文

学校读者我要写书评

暂无评论

Journal of Molecular Cell Biology 2020年第11期12卷 881-893页

作者： Quanxue Li Wentao Dai jixiang Liu Qingqing Sang Yi-Xue Li Yuan-Yuan Li School of Biotechnology East China University of Science and TechnologyShanghai 200237China Shanghai Center for Bioinformation Technology Shanghai 201203China Department of Surgery Shanghai Key Laboratory of Gastric NeoplasmsShanghai Institute of Digestive SurgeryRuijin HospitalShanghai jiao Tong University School of MedicineShanghai 200025China CAS Key Laboratory of Computational Biology CAS-MPG Partner Institute for Computational BiologyShanghai Institutes for Biological SciencesChinese Academy of SciencesShanghai 200031China Shanghai Engineering Research Center of Pharmaceutical Translation and Shanghai Industrial Technology Institute Shanghai 201203China

The implementation of cancer precision medicine requires biomarkers or signatures for predicting prognosis and therapeutic *** of current efforts in this field are paying much more attention to predictive accuracy than to molecular mechanistic ***-driven strategy has recently emerged,aiming to build signatures with both predictive power and explanatory *** by this strategy,we developed a robust gene dysregulation analysis framework with machine learning algorithms,which is capable of exploring gene dysregulations underlying carcinogenesis from high-dimensional data with cooperativity and synergy between regulators and several other transcriptional regulation rules taken into *** then applied the framework to a colorectal cancer(CRC)cohort from The Cancer Genome *** identified CRC-related dysregulations significantly covered known carcinogenic processes and exhibited good prognostic *** choosing dysregulations with greedy strategy,we built a four-dysregulation(4-DysReg)signature,which has the capability of predicting prognosis and adjuvant chemotherapy benefit.4-DysReg has the potential to explain carcinogenesis in terms of dysfunctional transcriptional *** results demonstrate that our gene dysregulation analysis framework could be used to develop predictive signature with mechanistic interpretability for cancer precision medicine,and furthermore,elucidate the mechanisms of carcinogenesis.

关键词： gene dysregulation analysis mechanistic signature cancer precision medicine prognosis chemotherapy benefit colorectal cancer

Ambient ozone pollution is associated with decreased semen quality:longitudinal analysis of 8945 semen samples from 2015 to 2018 and during pollution-control period in Beijing,China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2019年第5期21卷 501-507页

作者： Hai-Tao Zhang Zhe Zhang Jia Cao Wen-Hao Tang Hong-Liang Zhang Kai Hong Hao-Cheng Lin Han Wu Qing Chen Hui Jiang Department of Urology Peking University Third HospitalBeijing 100191China Department of Andrology Peking University Third HospitalBeijing 100191China Department of Reproductive Medicine Center Peking University Third HospitalBeijing 100191China Key Lab of Medical Protection for Electromagnetic Radiation Ministry of Education of ChinaInstitute of ToxicologyCollege of Preventive MedicineArmy Medical University(Third Military Medical UniversityChongqing 400038China Department of Human Sperm Bank Peking University Third HospitalBeijing 100191China

Previous studies suggest that air pollution has a negative effect on semen ***,most studies are cross-sectional and the results are *** study investigated the associations between air pollutants(PM25,PM10,SO2,NO2,CO,and O3)and seme n quality among sperm donation candidates,especially when the air pollution was artificially con trolled in Beijing,*** an a lyzed 8945 semen samples in the human sperm bank of Peki ng Un iversity Third Hospital(Beijing,China)from October 2015 to May *** pollution data during the entire period(0-90 days prior)and key stages(0-9,10-14,and 70-90 days prior)of sperm development were collected from the China National Environmental Monitoring *** association between air pollutants and seme n parameters(sperm con centrati on and progressive motility)was an a lyzed by a mixed model adjusted for age,abstinence duration,month,and average ambient *** O3 during key stages of 0-9 days and 10-14 days and the entire period was negatively associated with sperm concentration between 2015 and 2018(P v 0.01).During the period of air pollution control from November 2017 to January 2018,except for the in crease in O3 concentration,other five pollutants'concentrations decreased compared to those in previous *** this period,the sperm concentration decreased(P<0.001).During the pollution-control period,O3 exposure 10-14 days prior was negatively associated with sperm concentration(95%Cl:-0.399—0.111;P<0.001).No significant association was found between the other five pollutants and semen quality during that period?Our study suggested that only O3 exposure was harmful to semen ***,O3 should not be neglected during pollution control operation.

关键词： ambient pollution ozone pollution-control period reproductive health semen quality

Revealing the low thermal conductivity of high-entropy rare-earth tantalates via multi-scale defect analysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2023年第11期12卷 2087-2100页

作者： Jun Wang Qianqian Jin Jianbo Song Di Zhang Bin Xu Zhiyi Ren Meng Wang Shixiao Yan Xiaoliang Sun Chi Liu Xiaoyu Chong Jing Feng Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China Materials Science and Engineering Research Center Guangxi University of Science and TechnologyLiuzhou 545006China Shanghai Electro–Mechanical Engineering Institute Shanghai 201109China Shanghai Spaceflight Precision Machinery Institute Shanghai 201109China

Thermal barrier coating(TBC)materials can improve energy conversion efficiency and reduce fossil fuel ***,novel rare earth tantalates RETaO_(4),as promising candidates for TBCs,were reassembled into multi-component solid solutions with a monoclinic structure to further depress thermal conductivity via an entropy *** formation mechanisms of oxygen vacancy defects,dislocations,and ferroelastic domains associated with the thermal conductivity are demonstrated by aberration-corrected scanning transmission electron *** to single-RE RETaO_(4)and 8YSZ,the intrinsic thermal conductivity of(5RE1/5)TaO4 was decreased by 35%–47%and 57%–69%at 1200℃,respectively,which is likely attributed to multi-scale phonon scattering from Umklapp phonon–phonon,point defects,domain structures,and dislocations.r¯3+RE/r5+Ta and low-temperature thermal conductivity are negatively correlated,as are the ratio of elastic modulus to thermal conductivity(E/κ)and high-temperature thermal ***,the high defects’concentration and lattice distortion in high-entropy ceramics enhance the scattering of transverse-wave phonons and reduce the transverse-wave sound velocity,leading to a decrease in the thermal conductivity and Young’s *** addition,5HEC-1 has ultra-low thermal conductivity,moderate thermal expansion coefficients,and high hardness among three five-component high-entropy ***,5HEC-1 with superior thermal barrier and mechanical properties can be used as promising thermal insulating materials.

关键词： thermal barrier coating(TBC) entropy strategy oxygen vacancy dislocation ferroelastic domains intrinsic thermal conductivity

Multifractal Detrended Fluctuation analysis of Interevent Time Series in a Modified OFC Model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2013年第1期59卷 1-6页

作者：林敏颜双喜赵钢王刚 Department of Mathematics Ocean University of China College of Civil Aviation Nanjing University of Aeronautics and Astronautics Faculty of Transportation Engineering of Huaiyin Institute of Technology Key Laboratory of Data analysis and Applications(LDAA) First Institute of OceanographyState Oceanic Administration

We use multifractal detrended fluctuation analysis （MF-DFA） method to investigate the multifractal behavior of the interevent time series in a modified Olami-Feder-Christensen （OFC） earthquake model on assortative scale-free networks. We determine generalized Hurst exponent and singularity spectrum and find that these fluctuations have multifraetal nature. Comparing the MF-DFA results for the original interevent time series with those for shuffled and surrogate series, we conclude that the origin of multifractality is due to both the broadness of probability density function and long-range correlation.

关键词： multifractal detrended fluctuation analysis avalanche correlations

Genomics functional analysis and drug screening of SARS-CoV-2

在线全文

学校读者我要写书评

暂无评论

Genes & Diseases 2020年第4期7卷 542-550页

作者： Long Chen Li Zhong Bioengineering Institute of Chongqing University 174 Shazheng StreetChongqingChina

A novel coronavirus appeared in Wuhan,China has led to major ***,rapid classification of virus species,analysis of genome and screening for effective drugs are the most important *** the present study,through literature review,sequence alignment,ORF identification,motif recognition,secondary and tertiary structure prediction,the whole genome of SARS-CoV-2 were comprehensively *** find effective drugs,the parameters of binding sites were calculated by *** addition,potential miRNAs were predicted according to RNA *** prediction by using NCBI,WebMGA and Gene-Mark and comparison,a total of 8 credible ORFs were *** the whole genome have great difference with other CoVs,each ORF has high homology with SARS-CoVs(>90%).Furthermore,domain composition in each ORFs was also similar to *** the DrugBank database,only 7 potential drugs were screened based on the sequence search *** predicted binding sites between drug and ORFs revealed that 2-(N-Morpholino)-ethanesulfonic acid could bind 1#ORF in 4 different regions ***,both benzyl(2-oxopropyl)carbamate and 4-(dimehylamina)benzoic acid have bene demonstrated to inhibit SARS-CoV infection ***,2 miRNAs(miR-1307-3p and miR-3613-5p)were predicted to prevent virus replication via targeting 30-UTR of the genome or as *** conclusion,the novel coronavirus may have consanguinity with *** used to treat SARS may also be effective against the novel *** addition,altering miRNA expression may become a potential therapeutic schedule.

关键词： SARS-CoV-2 Drug screening Epitope Genomic Homology miRNA ORF

QSPR analysis of the Physicochemical Properties for Phthalic Acid Esters

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2013年第12期32卷 1880-1884页

作者： XU Hui-Ying SHU Tian-Ge WANG Wei ZHU Jian-Qing LU Yin XU Xiao-Lu WU Gang College of Biology & Environment Engineering Zhejiang Shuren University Zhenhai Environmental Monitoring Station Department of Basic Courses Zhejiang Shuren University Shaoxing University

Based on quantitative structure-property relationship （QSPR） of organic compounds, the molecular connectivity indices of 21 phthalic acid ester compounds were extracted. Relationship between the physicochemical properties （n-octanol/air partition coefficient, vapor pressure, water solubility） and the molecular connectivity indices of phthalic acid ester compounds have been established by multiple linear regression （MLR） method. The results showed that the zero-order valence connectivity index （0Xu） is the topology parameter which affects octanol/water partition coefficient and water solubility, and the topology parameter which affects vapor pressure is the first-order connectivity index （1X）. This indicated to a certain extent_that the molecular connectivity indices can be well used to express the quantitative relationship between the physicochemical properties and structure descriptions of phthalic acid ester compounds. The models constructed have good robustness and highly predictive capability.

关键词： phthalic acid esters molecular connectivity index,physicochemical property QSPR