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Effect of ultrasonic vibration on the dechromisation corrosion of a CuCr alloy in HCl solution

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Rare Metals 2007年第4期26卷 398-402页

作者： XU Tao gao Huawei LIU Jianhua YU Cuiyan Department of Applied Technology Daqing Pelroleum Institute Daqing 163318 China Logistics Groups Company Yanshan University Qinhuangdao 066004 China Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao 066004 China

The effect of ultrasonic vibration on the dechromisation corrosion of a CuCr alloy in HC1 solution was studied and the corrosion mechanisms were analyzed. It is found that ultlasonic vibration reduces the dechromisation incubation time, accelerates the dechromisafion corrosion rate, decreases the temperature and concentration of HC1 solution, and when the dechromisation occurs it seriously weakens the microstmcture of dechromisation layer. It is concluded that ultrasonic vibration can accelerate destruction of the passivation film on the Cr surface and increase the activities of Cl^- and Cr.

关键词： CuCr alloy dechromisation corrosion ultrasonic vibration passivation film

Loss of Genetic Diversity of Domesticated Panax notoginseng F H Chen as Evidenced by ITS Sequence and AFLP Polymorphism： A Comparative Study with P. stipuleanatus H T Tsai et K M Feng

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Journal of Integrative Plant Biology 2005年第1期47卷 107-115页

作者： Shi-LiangZHOU gao-MingXIONG Zhong-YiLI JunWEN LaboratoryofSystematicandEvolutionaryBotany InstituteofBotanytheChineseAcademyofSciencesBeijing100093China LaboratoryofQuantitativeVegetationEcology InstituteofBotanytheChineseAcademyofSciencesBeijing100093China WenshanSan-qiResearchInstitution WenshanPrefectureYunnan663000China LaboratoryofSystematicandEvolutionaryBotany InstituteofBotanytheChineseAcademyofSciencesBeijing100093China／／DepartmentofBotanyFieldMuseumofNaturalHistoryChicagoIllinois60605USA

In the present study, we evaluated the genetic diversity of Panax notoginseng F H Chen, a domesticated species, and P. stipuleanatus H T Tsai et K M Feng, an endangered wild species in southeastern Yunnan and adjacent areas in Vietnam, using sequences of the internal transcribed spacer (ITS) regions of nuclear ribosomal DNA and amplified fragment length polymorphism (AFLP) markers. Twenty-four accessions from three plantations of P. notoginseng and 51 samples from eight populations of P. stipuleanatus were assayed. A total of 694 bp of partial sequences of 18S, ITS 1, 5.8S, ITS2, and partial sequences of 26S were obtained. No sequence variation was detected within P. notoginseng and nine sites (1.30%) were variable in P. stipuleanatus. Two-thirds of the variable sites were found between Langqiao and other populations. In P. notoginseng, four pairs of AFLP primer combinations generated 312 bands, of which 240 (76.9%) were polymorphic and 60.15% of the polymorphisms were harbored within plantations. Approximately 41.0% and 66.9% of bands were polymorphic in population D7 and 5589, respectively. In ***, the same four primer combinations produced 346 bands, of which 334 (96.5%) were polymorphic and approximately 62.14% of polymorphisms were maintained within populations. Considerable variations were observed. The percentage of polymorphic bands ranged from 50.2% to 84.9% and the average over populations was 70.9%. Cluster analysis did not show correlation of genetic differentiation with the distinctive leaf morphology of P. stipuleanatus (i.e. one form with bipinnatifid leaflets and the other with undivided leaflets). Because over 40% of genetic variations were maintained among populations and because of the very restricted distribution of P. stipuleanatus, all natural populations of this species should be conserved in situ. Considering that there are variations in P. notoginseng within and among plantations, we suggest establishing a genetic resource conser

关键词： amplified fragment length polymorphism Araliaceae conservation genetics internal transc-ribed spacer Panax notoginseng F H Chen P.stipuleanatus H T Tsaiet KM Feng.

Nitrification potentials of Chinese tea orchard soils and their adjacent wasteland and forest soils

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Journal of Environmental Sciences 2009年第9期21卷 1225-1229页

作者： XUE Dong gao Yangmei YAO Huaiying HUANG Changyong Zhejiang Provincial Key Laboratory of Subtropic Soil and Plant Nutrition College of Environmental and Resource Sciences Zhejiang University (Huajiachi Campus) Hangzhou 310029 China. Department of Environmental and Chemical Engineering Luoyang Institute of Science and Technology Luoyang 471023 China

To investigate the nitrifying activities of different soil types, soil samples collected from 8-, 50- and 90-year old tea orchards, the adjacent wasteland, and 90-year old forest were measured for their nitrification potentials using the conventional soil incubation and the liquid incubation method. Among different soil types, the nitrification potential of soil in tea orchards was higher than that of wasteland and forest soils. The slurry shaken liquid incubation method was confirmed to be more accurate and have reliable results than the soil incubation. Interestingly, experimental result revealed that the generally applied pH value of 7.2 for the liquid media was not the optimal pH for these acid soils with a strong buffer capacity. This suggested that tea orchard soils may have nitrifiers requiring pHneutral condition for the best activity. Our data also showed that treatment with the commonly used nitrogen fertilizer urea significantly improved nitrification potential of the soils; such enhancement effect was stronger on all of three tea orchard soils than on wasteland and forest soils, and also stronger on the younger （8- and 50-year old） tea orchard soils than on the older one （90-year old）.

关键词： tea orchard wasteland forest nitrification potential urea

Situation Awareness Data Fusion Method Based on Library Events

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Computer Systems Science & Engineering 2022年第9期42卷 1047-1061页

作者： Haixu Xi Wei gao Gyun Yeol Park School of Economics and Management Nanjing University of Science and TechnologyNanjing210094JiangsuChina School of Computer Engineering Jiangsu University of TechnologyChangzhou213001China Gyeongsang National University Jinju52828Korea

Microelectronic technology and communication technology are developed in deep manner;the computing mode has been transferred from traditional computer-centered to human centered ***,the concept of Internet of things(IoT)is gradually put forward,which allows people to access information about their surroundings on demand through different *** library is the major public space for human to read and *** to provide a more comfortable library environment to better meet people’s learning requirements is a place where the Internet of things plays its *** purpose of this paper is to solve the difference between the data fusion of library environment and the data fusion of other environments by the method of data fusion oriented to *** paper presents a general technical framework of situational awareness for smart library system which includes a data fusion *** can process data and inform the upper module of the changed library environment after deploying the smart library system in a library,including data collection and processing,how to judge whether events are triggered,how the system reacts,and the acquisition and update of user *** paper presents a situational awareness recommendation method based on an effective data fusion model and algorithm for library after conducting experimental in service of library,which give more accurate of book recommendation than traditional method and good learning service environment of library for readers.

关键词： Intelligent library internet of things situational awareness information fusion data fusion

Approaches and Perspectives of the Westward Spread of Traditional Chinese Medicine: A Case Study of the Radicis Chynae

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Chinese Medicine and Culture 2021年第3期4卷 141-147页

作者： Xi gao Department of History Fudan UniversityShanghai 200433China

Some Western scholars have re-examined the concept of“Chinese medicine”and its knowledge system under the influence of global history research methods in recent years,in an attempt to understand the factors that led to the spread of Chinese medicine around the world,and what kind of Chinese medicine is constituted outside of ***,researchers have studied the initial stage of traditional Chinese medicine(TCM)’s entry into the western world,tracing its roots and observing new knowledge systems formed in the process of cross-cultural *** to the research of Western scholars,this paper studies the Radicis Chynae(《中国根书简》Letters on Chinese Root),a monograph written by Andreas Vesalius,a famous European anatomist who lived in the 16th *** author of this article examined the understanding and interpretation of Chinese medicine by the European intelligentsia from 16th to 19th century,investigated the influence of the westward spread of TCM on the scientific revolution and medical progress in Europe,and analyzed its relationship with the rise of Sinology in *** article discusses the knowledge interaction between Chinese medicine and the formation of modern European medicine from the perspective of global history and cross-culture.

关键词： Andreas Vesalius Charles V China root Tu Fu Ling(土茯苓Rhizoma Smilacis Glabrae) westward spread of traditional Chinese medicine

Study of angiogenesis induced by metastatic and non-metastatic liver cancer by corneal micropocket model in nude mice

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World Journal of Gastroenterology 1999年第2期5卷 28-30页

作者： SUN Hui Chuan, LI xiao Ming, XUE Qiong, CHEN Jun, gao Dong Mei and TANG Zhao You

AIM To study the angiogenesis induced by liver cancer with different metastatic potentials using corneal micropocket model in nude *** Corneal micropockets were created in nude mice. Tumor tissues and liver tissues were implanted into the corneal micropockets. Angiogenesis was observed using a digital camera under slit-lamp biomicroscope, and compared among different grafts and incision alone. Vascular responses were recorded in regard to the range, number and length of new blood vessels toward the grafts or *** Vascular responses induced by tumor tissues were greater than those by incision alone and liver tissue grafts. LCI-D20 induced more intensive angiogenesis than *** Highly metastatic liver cancer LCI D20 was more angiogenic than low metastatic cancer LCI D35 and liver tissue. Micropocket was a useful model to study dynamic process of angiogenesis in vivo.

关键词： liver neoplasms angiogenesis corneal micropocket model neoplasms metastasis

Improve access to the EU market by identifying French consumer preference for fresh fruit from China

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Journal of Integrative Agriculture 2018年第6期17卷 1463-1474页

作者： WANG Er-peng Zhifeng gao Yan Heng School of Economics and Management Nanjing Tech University College of Economics and Management Jilin Agricultural University Food and Resource Economics Department University of Florida

Most previous studies have investigated country-of-origin effect for agricultural products from the economically developed country, but few have focused on the impact of country-of-origin on agricultural products from economically developing countries. Using a national online survey in France, we determine French consumers＇ perceptions and preferences for fresh fruit from China. Results of ordered logit models show that fresh fruit from China was perceived as low quality and unsafe. Respondents who care about country-of-origin were less likely to purchase fresh fruit from China, while those who care about brand were more likely to buy Chinese fresh fruit. Risk perception and quality perception both had a significant impact on the purchase of Chinese fresh fruit. Results of latent class models obtained with key consumer demographics show that heterogeneous preferences exist among different consumer groups. The results provide critical information to both China and other economically developing countries in their efforts to improve market penetration in economically developed countries.

关键词： country of origin perception consumer preference fresh fruit China

Effects of Process Parameters on the Temperature Field in Ti-6Al-4V Alloy Blade Precision Forging Process

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Journal of Materials Science & Technology 2006年第4期22卷 473-477页

作者： Yuli LIU He YANG Tao gao Mei ZHAN College of Materials Science and Engineering Northwestern Polytechnical University Xi＇an 710072 China

Blade precision forging is a high temperature and large plastic deformation process. Process parameters have a great effect on temperature distribution in billet, so in this paper, by taking a Ti-6Al-4V alloy blade with a tenon as an object, the influence of process parameters on the temperature distribution in precision forging process was investigated using 3D coupled thermo-mechanical FEM （finite element method） code developed by the authors. The results obtained illustrate that：（1） the gradient of temperature distribution increases with increasing the deformation degree; （2） with increasing the initial temperature of the billet, the zones of high temperature become larger, and the gradient of temperature distribution hardly has any increase; （3） friction factors have little effect on the distribution of temperature field; （4） with increasing upper die velocity, temperature of the billet increases while the temperature gradient in billet decreases. The results are helpful to the design and optimization of the process parameters in precision forging process of Ti-alloy blade.

关键词： Ti-alloy blade Precision forging Process parameter Temperature field Finite element method (FEM)

An interactive web-based solar energy prediction system using machine learning techniques

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Journal of Management Analytics 2023年第2期10卷 308-335页

作者： Priyanka Chawla Jerry Zeyu gao Teng gao Chengchen Luo Huimin Li Yiqin We Department of Computer Science and Engineering National Institute of TechnologyWarangalIndia San Jose State University San JoseCAUSA

Solar energy being one of the most inexpensive renewable energy sources,has shown to be a viable alternative to traditional fossil-fuel and wood-based electricity *** the purpose of creating a more trustworthy and successful energy planning strategy,accurate projections of sun irradiation,solar energy generation,and revenues are ***,in this work we have proposed webbased optimal prediction system that estimates solar radiation based on location and meteorological data using Machine Learning ***,an interactive dashboard solar digital map has been developed that enables real-time investigation of solar energy consumption,production,solar radiation,and investment potential for a specific county in *** model’s performance has been measured using Root Mean Square Error(RMSE),Mean Square Error(MSE),Mean Average Error(MAE),and Mean Absolute Percentage Error(MAPE)*** results demonstrate that stacking model outperformed all the models with the lowest RMSE,MSE,and MAE.

关键词： solar radiation solar energy renewable energy machine learning solar map