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Secure Image Hiding Scheme Based on Magic Signet

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Journal of Electronic Science and Technology 2020年第1期18卷 93-101页

作者： Chin-feng Lee ying-Xiang Wang Department of Information Management Chaoyang University of TechnologyTaichung 41349

Image data hiding technology is secret communications that carry hidden data in such a way that no one except the sender and intended recipients can even realize there is a hidden message. High embedding capacity,good images quality, and security are three important essentials. In this paper, each confidential hexadecimal will be carried by two cover pixels based on a magic matrix generated from a square template to reach the goal of higher embedding capacity while keeping good image visualization. Experimental results reveal that the proposed scheme guarantees higher embedding capacity of 2 bits per pixel and has the peak signal-to-noise ratio(PSNR) of 44.7 dB on average. Moreover, secret keys are used to ensure security consideration.

关键词： Data hiding embedding capacity steganography visual quality

Corrosion behavior of laser-clad coatings fabricated on Ti6Al4V with different contents of TaC addition

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Rare Metals 2020年第4期39卷 436-447页

作者： Lie-feng Hu Jun Li ying-Hao Lv Yang-feng Tao School of Materials Engineering Shanghai University of Engineering ScienceShanghai 201620China

The coatings were produced on Ti6A14V by lasercladding the mixture of Ni-based alloy and different contents of TaC(0 wt%,5 wt%,10 wt%,20 wt%,30 wt%,40 wt%).The microstructure and corrosion behavior of the coatings were investigated in *** coating without TaC is composed of TiNi/Ti2Ni(matrix)and TiC/TiB/TiB2(reinforcement).Moreover,TaC is precipitated again and TiC/TiB/TiB2 solid solutions containing Ta are formed in the *** potential of the coatings(-0.639,-0.636,-0.547,-0.534,-0.471 and-0.348 V)increases,and passive current density(1×10-5.4,1×10-5.6,1×10-6.4,1×10-6.8,1×10-6.7 and 1×10-6.9 A·cm-2)*** passive films are more difficult to break down(breakdown potential of 0.003,0.080,0.204 and 0.605 V).When the content of TaC exceeds 20 wt%,no breakdown phenomenon is *** passive film on the surface of coating without TaC is mainly composed of TiO2,Al2O3,Cr2O3,CrO3,NiO,Ni2O3 and *** the addition of TaC,Ta2O5 is formed in the passive *** content of Ta2O5 presents an increasing trend with the increase in the content of *** addition of TaC has a positive effect on corrosion resistance of the coatings.

关键词： Laser cladding Coating Microstructural evolution Corrosion resistance

Complete moment convergence for ND random variables under the sub-linear expectations

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Applied Mathematics(A Journal of Chinese Universities) 2023年第3期38卷 444-457页

作者： feng feng-xiang WANG Ding-cheng WU Qun-ying College of Science Guilin University of TechnologyGuilin 541004China School of Mathematical Science University of Electronic Science and TechnologyChengdu 611731China

In this article,we establish a general result on complete moment convergence for arrays of rowwise negatively dependent(ND)random variables under the sub-linear *** applications,we can obtain a series of results on co... 详细信息

关键词： complete convergence complete moment convergence ND random variables sub-linear expectation

Oxygen vacancies enriched Ir/WOx catalysts for the directly chem-catalytic conversion of cellulose to ethanol

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Tungsten 2025年第1期 88-99页

作者： Yu-Jing Weng zhao-ying Ding ying-Chao Li Yuan-feng Wu Yuan-Yang Xu Rui Chen Xiao-Lei zhao Hai-Yong Wang Da-Lei zhang Yu-Long zhang Henan Key Laboratory of Coal Green Conversion and International Joint Laboratory of Coal Clean Utilization College of Chemistry and Chemical Engineering Henan Polytechnic University Key Laboratory of Renewable Energy Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Liaoning Institute of Energy Technology

Tungsten and its oxides are highly versatile catalysts with unique properties that hold great promise for a wide array of applications,including biological pathways and chemical *** chemo-catalysis of cellulose to ethanol presents a promising avenue for ethanol synthesis with the potential for enhanced efficiency compared to conventional methods,offering a sustainable and carbon-neutral alternative to existing petrochemical and biological ***,Ir/WOxcatalysts enriched with oxygen vacancies were meticulously prepared and demonstrated remarkable catalytic performance in converting cellulose to ethanol directly in the presence of tungstic *** catalyst achieved a high ethanol yield of 66.5%under optimal reaction conditions,approaching the theoretical yield limit of traditional ethanol *** results revealed the presence of oxygen defects,Bronsted/Lewis acidity,and Ir nanoclusters on the catalyst surface,working synergistically to facilitate the cascade catalysis of cellulose hydrolysis,sugar retro-aldol condensation reaction,and C2 intermediate hydrodeoxygenation to *** situ Fourier transform infrared spectrometer analysis confirmed the catalyst's ability to enhance the adsorption and activation of ethylene glycol for ethanol *** manipulating subtle structural features,this study offers a fresh perspective on tungsten group catalyst design and underscores the importance of synergistic effects among catalytic sites for the efficient production of ethanol from cellulose.

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Gene Expression and Activity of Enzymes Involved in Sugar Metabolism and Accumulation During “Huangguan” and “Yali” Pear Fruit Development

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Transactions of Tianjin University 2018年第2期24卷 101-110页

作者： xiaohong Kou Yunfei Li ying zhang Bianling Jiang zhaohui Xue School of Chemical Engineering and Technology Tianjin University

Since the carbohydrate content affects pear flavor during the process of growth, it is necessary to determine the sugar components that accumulate in the fruit. We analyzed the fruit carbohydrate content, and the gene expression and activity ofacid invertase(AI), neutral invertase(NI), sucrose synthase(SS), and sucrose phosphate synthase(SPS) during the development of "Huangguan" and "Yali" pears. The results demonstrate that during development, the fruit sugar metabolism of the "Huangguan" pear follows a typical sorbitol–starch-soluble sugars middle model, whereas the "Yali" pear fruit follows a typical sorbitol–sucrose–starch-soluble sugars middle model. In the "Huangguan" pear, we found the AI and NI gene expressions, as well as AI( P < 0.05) and NI( P < 0.01) enzyme activities, to be positively correlated, whereas we found the NI gene expression and NI enzyme activity of "Yali" pear to be negatively correlated( P < 0.01). We observed the high levels oflate-stage AI and early-stage SS during development to roughly correspond with the gene expression found in the late and early stages, respectively, suggesting their potential regulatory roles in "Huangguan" pear fruit development. Our results indicate that the primary function of SPS during the early developmental stage is to accumulate sucrose, whereas the primary function of AI is to promote hexose accumulation during the late developmental stage ofmature "Yali" pear fruit.

关键词： “Huangguan”pear “Yali”pear Sugar metabolism Enzyme activity Gene expression

Study on carbon emission in prefecture-level cities of china

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High Technology Letters 2012年第1期18卷 101-106页

作者： feng ying Cai Bofeng Institute of Scientific and Technical Information of China Beijing 100038 P.R. China College of Environmental Sciences and Engineering Peking University Beijing 100871 P.R. China Center for Climate and Environmental Policy Chinese Academy for Environmental Planning Beijing 100012 P.R. China

The study on greenhouse gas inventory in urban China lags far behind the global level. The important factor that curbs the carbon inventory of cities of China is inventory methodology and scope. Given the insufficiency of Chinese cities carbon inventory, a system and accounting model （scopel＋ scope2） as well as principles and boundaries were proposed for China. The carbon emissions in scopel and scopel＋ scope2 were calculated in Chinese prefecture-level cities. The EDGAR dataset was used for the calculation of scopel carbon emissions in cities in China and the level of uncertainty was analyzed as well. The results showed that the direct carbon emission of cities in China was about 31.65% of China total emissions. The scopel＋ scope2 carbon emissions in cities of China were calculated based on the GIS and RS model. The results showed that the sum of direct （scopel） and indirect （scope2） carbon emissions of cities in China accounted for 38.80% of total China carbon emissions.

关键词： cities carbon emission inventory scope

Identification of hedgehog signaling as a potential oncogenic driver in an aggressive subclass of human hepatocellular carcinoma: A reanalysis of the TCGA cohort

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Science China(Life Sciences) 2019年第11期62卷 1481-1491页

作者： Yang zhao Li zhang Yong zhang Bo Meng Wantao ying xiaohong Qian College of Life Science and Bioengineering Beijing University of TechnologyBeijing 100124China State Key Laboratory of Proteomics Beijing Proteome Research CenterNational Center for Protein Sciences(Beijing)Beijing Institute of LifeomicsBeijing 102206China Center for Bioinformatics and Computational Biology Institute of Biomedical SciencesSchool of Life SciencesEast China Normal UniversityShanghai 200241China School of Statistics Faculty of Economics and ManagementEast China Normal UniversityShanghai 200241China Key Lab of Transplant Engineering and Immunology West China-Washington Mitochondria and Metabolism Research CenterWest China HospitalSichuan UniversityChengdu 610041China

Hepatocellular carcinoma(HCC)is a heterogeneous disease and the second most common cause of cancer-related death *** developments in genomic technologies helped scientists to understand the heterogeneity of HCC and identified multiple HCC-related molecular *** integrative analysis of genomic datasets including 196 patients from The Cancer Genome Atlas(TCGA)group has recently reported a new HCC subclass,which contains three subgroups(iCluster1,iCluster2,and iCluster3).However,the transcriptional molecular characteristics underlying the iClusters have not been thoroughly ***,we identified a more aggressive subset of HCC patients in the iCluster1,and re-clustered the TCGA samples into novel HCC subclasses referred to as aggressive(Ag),moderate-aggressive(M-Ag),and less-aggressive(L-Ag)*** Ag subclass had a greater predictive power than the TCGA iCluster1,and a higher level of alpha fetoprotein,microscopic vascular invasion,immune infiltration,isocitrate dehydrogenase 1/2 mutation status,and a worse survival than MAg and L-Ag *** transcriptomic analysis showed that activation of hedgehog signaling in the Ag subclass may play key roles in tumor development of aggressive ***1,a key transcriptional regulator of hedgehog signaling upregulated in the Ag subclass,was correlated with poor prognosis of HCC,and may be a potential prognostic biomarker and therapeutic target for Ag subclass HCC patients.

关键词： hepatocellular carcinoma The Cancer Genome Atlas molecular subclass Wnt hedgehog

单层Cs_(2)PbI_(2)Cl_(2)中点缺陷的形成与稳定性

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原子与分子物理学报 2025年第5期42卷 130-136页

作者：何诗颖赵宇清邹代峰许英廖雨洁禹卓良湖南科技大学物理与电子科学学院湘潭411201 智能传感器与新型传感器材料湖南省重点实验室湘潭411201 湖南理工学院物理与电子科学学院岳阳414006

Cs_(2)PbI_(2)Cl_(2)是卤化铅钙钛矿材料的新成员,由于其高的光吸收系数和长的载流子迁移距离等优异的光电物理性能,在太阳能电池、光电探测器、场效应晶体管以及发光二极管等领域受到广泛的关注.其中光电材料及器件的优良特性由电子结... 详细信息

Cs_(2)PbI_(2)Cl_(2)是卤化铅钙钛矿材料的新成员,由于其高的光吸收系数和长的载流子迁移距离等优异的光电物理性能,在太阳能电池、光电探测器、场效应晶体管以及发光二极管等领域受到广泛的关注.其中光电材料及器件的优良特性由电子结构决定,而钙钛矿的点缺陷对电子结构具有重要的调控,且单层Cs_(2)PbI_(2)Cl_(2)中点缺陷的研究尚且缺乏.本文基于密度泛函理论的第一性原理计算,对单层Cs_(2)PbI_(2)Cl_(2)的铯空位、碘空位、氯空位、铯替代铅、碘替代铯、碘替代铅、碘替代氯、氯替代铯、氯替代铅和氯替代碘的缺陷形成能和稳定性进行了研究.结果表明:在富铅和缺铅条件下,碘替代氯和氯替代碘的缺陷形成能偏低,且氯替代碘能有效降低体系总能,提高体系稳定性.在缺铅条件下铯空位缺陷形成能低于富铅条件,在缺铅条件下更易形成铯空位;富铅和缺铅条件下对碘替代氯和氯替代碘的缺陷形成能基本无影响.上述研究结果有助于理解点缺陷对钙钛矿材料稳定性的影响,同时也为未来实验上设计基于Cs_(2)PbI_(2)Cl_(2)的高效的光电子器件提供理论依据.

关键词：单层Cs_(2)PbI_(2)Cl_(2) 形成能点缺陷稳定性

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Optimization of the O_(3)/H_(2)O_(2) process with response surface methodology for pretreatment of mother liquor of gas field wastewater

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Frontiers of Environmental Science & Engineering 2021年第4期15卷 337-349页

作者： Haoran feng Min Liu Wei Zeng ying Chen College of Architecture and Environment Sichuan UniversityChengdu610065China

The present study reports the use of the O_(3)/H_(2)O_(2) process in the pretreatment of the mother liquor of gas field wastewater(ML-GFW),obtained from the multi-effect distillation treatment of the gas field *** range of optimal operation conditions was obtained by single-factor *** surface methodology(RSM)based on the central composite design(CCD)was used for the optimization procedure.A regression model with Total organic carbon(TOC)removal efficiency as the response value was established(R^(2)=0.9865).The three key factors were arranged according to their significance as:pH>H_(2)O_(2) dosage>ozone flow *** model predicted that the best operation conditions could be obtained at a pH of 10.9,an ozone flow rate of 0.8 L/min,and H_(2)O_(2) dosage of 6.2 *** dosing ratio of ozone was calculated to be 9.84 mg O3/mg *** maximum removal efficiency predicted was 75.9%,while the measured value was 72.3%.The relative deviation was found to be in an acceptable *** ozone utilization and free radical quenching experiments showed that the addition of H_(2)O_(2) promoted the decomposition of ozone to produce hydroxyl radicals(·OH).This also improved the ozone utilization *** chromatography-mass spectrometry(GC-MS)analysis showed that most of the organic matters in ML-GFW were degraded,while some residuals needed further *** study provided the data and the necessary technical supports for further research on the treatment of ML-GFW.

关键词： High salinity High organic matters Gas field wastewater O_(3)/H_(2)O_(2) Response surface methodology