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Identification of processed Chinese medicinal materials using DNA mini-barcoding

Chinese Journal of Natural Medicines 2017年第7期15卷 481-486页

作者： SONG ming DONG Gang-Qiang zhang ya-Qin LIU Xia SUN Wei Institute of Chinese Materia Medica China Academy of Chinese Medical Sciences Beijing 100700 China School of Chemistry Chemical Engineering and Life Sciences Wuhan University of Technology Wuhan 430070 China Amway (China) Botanical Research and Development Center Wuxi 214145 China

Most of Chinese medicinal herbs are subjected to traditional processing procedures, including stir-frying, charring, steaming, boiling, and calcining before they are released into dispensaries. The marketing and identification of processed medicinal materials is a growing issue in the marketplace. However, conventional methods of identification have limitations, while DNA mini-barcoding, based on the sequencing of a short-standardized region, has received considerable attention as a new potential means to identify processed medicinal materials. In the present study, six DNA barcode loci including ITS2, psb A-trn H, rbc L, mat K, trnL(UAA) intron and its P6 loop, were employed for the authentication of 45 processed samples belonging to 15 species. We evaluated the amplification efficiency of each locus. We also examined the identification accuracy of the potential mini-barcode locus, of trnL(UAA) intron P6 loop. Our results showed that the five primary barcode loci were successfully amplified in only 8.89%——20% of the processed samples, while the amplification rates of the trnL(UAA) intron P6 loop were higher, at 75.56% successful amplification. We compared the mini-barcode sequences with Genbank using the Blast program. The analysis showed that 45.23% samples could be identified to genus level, while only one sample could be identified to the species level. We conclude that trnL(UAA) p6 loop is a candidate mini-barcode that has shown its potential and may become a universal mini-barcode as complementary barcode for authenticity testing and will play an important role in medicinal materials control.

关键词： DNA barcoding trnL(UAA)intron P6 loop Identification Processed medicinal materials Mini-barcode

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Preparation and properties of thermal insulation coatings with a sodium stearate-modified shell powder as a filler

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International Journal of Minerals,Metallurgy and Materials 2017年第10期24卷 1192-1199页

作者： Qiang Tang ya-mei zhang Pei-gen zhang Jin-jie Shi Wu-bian Tian Zheng-ming Sun Jiangsu Key Laboratory of Construction Materials School of Materials Science and Engineering Southeast University Nanjing 211189 China Jiangsu Key Laboratory of Advanced Metallic Materials School of Materials Science and Engineering Southeast University Nanjing 211189 China

Waste shell stacking with odor and toxicity is a serious hazard to our living environment. To make effective use of the natural resources, the shell powder was applied as a filler of outdoor thermal insulation coatings. Sodium stearate(SS) was used to modify the properties of shell powder to reduce its agglomeration and to increase its compatibility with the emulsion. The oil absorption rate and the spectrum reflectance of the shell powder show that the optimized content of SS as a modifier is 1.5wt%. The total spectrum reflectance of the coating made with the shell powder that is modified at this optimum SS content is 9.33% higher than that without any modification. At the optimum SS content of 1.5wt%, the thermal insulation of the coatings is improved by 1.0℃ for the cement mortar board and 1.6℃ for the steel plate, respectively. The scouring resistance of the coating with the 1.5wt% SS-modified shell powder is three times that of the coating without modification.

关键词： heat insulation coatings shell powder sodium stearate scrub resistance

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Mechanical Property Prediction of Strip Model Based on PSO-BP Neural Network

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Journal of Iron and Steel Research International 2008年第3期15卷 87-91页

作者： WANG Ping HUANG Zhen-yi zhang ming-ya ZHAO Xue-wu School of Metallurgy and Materials Anhui University of Technology Ma＇anshan 243002 Anhui China Anhui Key Laboratory of Metal Materials and Processing Ma＇anshan 243002 Anhui China zhangjiagang Pohang Stainless Steel Co Ltd Zhangjiagang 215000 Jiangsu China

Mechanical property prediction of hot rolled strip is one of the hotspots in material processing research. To avoid the local infinitesimal defect and slow constringency in pure BP algorithm, a kind of global optimization algorithm-particle swarm optimization （PSO） is adopted. The algorithm is combined with the BP rapid training algorithm, and then, a kind of new neural network （NN） called PSO-BP NN is established. With the advantages of global optimization ability and the rapid constringency of the BP rapid training algorithm, the new algorithm fully shows the ability of nonlinear approach of multilayer feedforward network, improves the performance of NN, and provides a favorable basis for further online application of a comprehensive model.

关键词： particle swarm optimization algorithm BP neural network hot continuous rolling strip mechanical property prediction

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Science Letters:Hydrogen transfer reduction of ketones using formic acid as a hydrogen donor under hydrothermal conditions

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第11期10卷 1631-1635页

作者： Zheng SHEN Fang-ming JIN ya-lei zhang Bing WU Jiang-lin CAO State Key Laboratory of Pollution Control and Resources Reuse MOE Key Laboratory of Yangtze River Water Environment College of Environmental Science and Engineering Tongji University Shanghai 200092 China

The hydrothermal experiments with ketones and formic acid showed that the hydrogen transfer reduction of ketones can be conducted using formic acid as a hydride donor in the presence of NaOH at 300 ℃. The yield of alcohols was considerably higher at a much lower ratio of hydrogen source to ketones than the traditional Meerwein-Ponndorf-Verley （MPV） reduction, reaching 60% for isopropanol from acetone and 70% for lactic acid from pyruvic acid. Water molecules may act as a catalyst in the hydrogen transfer reduction of ketones under hydrothermal conditions.

关键词： Hydrogen transfer reduction Formic acid Ketone Hydrothermal reaction

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Zonal disintegration phenomenon in enclosing rock mass surrounding deep tunnels——Elasto-plastic analysis of stress field of enclosing rock mass

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Mining Science and Technology 2009年第3期19卷 84-90页

作者： WU Hao FANG Qin zhang ya-dong GONG Zi-ming Engineering Institute of Engineering Corps PLA University of Science and Technology Nanjing Jiangsu 210007 China

The zonal disintegration phenomenon （ZDP） is a typical phenomenon in deep block rock masses. In order to investigate the mechanism of ZDP, an improved non-linear Hock-Brown strength criterion and a bi-linear constitutive model of rock mass were used to analyze the elasto-plastic stress field of the enclosing rock mass around a deep round tunnel. The radius of the plastic region and stress of the enclosing rock mass were obtained by introducing dimensionless parameters of radial distance. The results show that tunneling in deep rock mass causes a maximum stress zone to appear in the vicinity of the boundary of the elastic and the plastic zone in the surrounding rock mass. Under the compression of a large tangential force and a small radial force, the rock mass in the maximum stress zone was in an approximate uniaxial loading state, which could lead to a split failure in the rock mass.

关键词： enclosing rock mass around deep tunnels zonal disintegration equivalent material Hoek-Brown strength criterion

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On the Generalization of the *** Problem

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Acta Mathematica Sinica,English Series 2009年第8期25卷 1269-1274页

作者： ya ming LU Yuan YI Research Center for Basic Science Xi'an Jiaotong University Xi'an 710049 P. R. China

Let n ≥ 2 be a fixed positive integer, q ≥ 3 and c be two integers with （n, q） = （c, q） = 1. We denote by rn（51, 52, C; q）（δ 〈 δ1,δ2≤ 1） the number of all pairs of integers a, b satisfying ab ≡ c（mod q）, 1 〈 a ≤δ1q, 1 ≤ b≤δ2q, （a,q） = （b,q） = 1 and nt（a＋b）. The main purpose of this paper is to study the asymptotic properties of rn （δ1, δ2, c; q）, and give a sharp asymptotic formula for it.

关键词： D. H. Lehmer problem Gauss sum Kloosterman sum

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The Development of a Geographic Information System(GIS) Database for Jiuzhaigou National Nature Reserve and Its Application

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Journal of Mountain Science 2013年第3期10卷 398-409页

作者： DI Bao-feng zhang Kai-shan TANG ya zhang ming-hua Susan L.USTIN Department of Environmental Science and Engineering Sichuan University Department of Land Airand Water ResourcesUniversity of California Davis

The objective of this paper is to develop a GIS(Geographic Information System) database for Jiuzhaigou National Nature Reserve(Jiuzhaigou,hereafter) in China and demonstrate its application as a research tool.A cost-effective procedure was developed to compile a variety of geographical and biological data of the study area in terms of popular GIS format such as shape *** files were further calibrated and validated using field surveys *** developed GIS database was used to quantify the distributions of the wildlife(amphibians,mammals,and birds) using the distances of the wildlife to the centerline of the bus-tour *** Pearson correlation coefficient was used to quantify the correlation in space between pairs of different wildlife using the number of habitats for given space *** ArcObject-based macro was developed to perform the *** results showed the majority of the habitats of wildlife are located in the proximity of the tour-bus routes with an average distance ranging from 564 to 894 m depending on types of *** indicates a possibility of the disturbance to the wildlife by human *** correlation coefficient of the wildlife ranged from 0.36 to 0.64 depending on pairs of wildlife,indicating some correlations in ***,due to the limited sample size,the statistical significances need to be further *** paper has successfully demonstrated the use of the GIS-based database as a research tool for environmental study.

关键词： Geographic Information System (GIS) Database Remote sensing Wildlife CorrelationCoefficient Jiuzhaigou

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A Note on the Lehmer Problem over Short Intervals

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Acta Mathematica Sinica,English Series 2011年第6期27卷 1115-1120页

作者： ya ming LU Yuan YI School of Science Xi'an Jiaotong University Xi'an 710049 P. R. China

Let p be an odd prime, c be an integer with （c,p） = 1, and let N be a positive integer withN ≤ p - 1. Denote by r（N, c;p） the number of integers a satisfying 1 ≤ a ≤ N and 2 a ＋ a, where a is an integer with 1 ≤a≤ p - 1, aa ≡ c （mod p）. It is well known that r（N, c;p） = 1/2N ＋ O（p1/2log2p）.The main purpose of this paper is to give an asymptotic formula for ∑p-1 c=1（τ（N,c;p）-1/2N）2.

关键词： Lehmer problem character sum Dirichlet L-function

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A Secure Clock Synchronization Scheme for Wireless Sensor Networks Against Malicious Attacks

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Journal of Systems Science & Complexity 2021年第6期34卷 2125-2138页

作者： zhang Xuxin LIU yanzhang zhang ya School of Automation Southeast UniversityNanjing 210096China Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of EducationNanjing 210096China China Electric Power Research Institute Nanjing 210003China

This paper studies the secure and accurate clock synchronization problem for sensor networks with time-varying delays and malicious attacks.A novel clock synchronization scheme based on the attack detection mechanism,attack compensation,and maximum consensus protocol is *** proposed scheme starts with the detection of the malicious attacks and the clock data under attacks is *** the basis,software clock parameters are updated so that all the nodes in the network can have the same software skew and offset,so the clock synchronization can be ***,it is theoretically proved that the proposed scheme can achieve the attack detection correctly,and further can guarantee a secure and accurate clock *** addition,extensive simulations are also conducted to validate the effectiveness of the proposed scheme.

关键词： Clock synchronization communication delays consensus malicious attacks wireless sensor networks

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Effects of the Casimir force on the properties of a hybrid optomechanical system

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Chinese Physics B 2019年第1期28卷 379-384页

作者： Yi-Ping Wang Zhu-Cheng zhang ya-Fei Yu Zhi-ming zhang Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices(School of Information and Optoelectronic Science and Engineering) Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum MaterialsSouth China Normal University

We investigate the effects of the Casimir force on the output properties of a hybrid optomechanical system. In this system, a nanosphere is fixed on the movable-mirror side of the standard optomechanical system, and the nanosphere interacts with the movable-mirror via the Casimir force, which depends on the mirror–sphere separation. In the presence of the probe and control fields, we analyze the transmission coefficient and the group delay of the field-component with the frequency of the probe field. We also study the transmission intensity of the field-component with the frequency of a newly generated four-wave mixing(FWM) field. By manipulating the Casimir force, we find that a tunable slow light can be realized for the field-component with the frequency of the probe field, and the intensity spectrum of the FWM field can be enhanced and shifted effectively.

关键词： quantum optics optomechanics quantum information and processing

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