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Structure identification of an uncertain network coupled with complex-variable chaotic systems via adaptive impulsive control 认领 引用 被引量：4
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作者 刘丹峰 吴召艳 叶青伶 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第4期183-190,共8页
In this paper, structure identification of an uncertain network coupled with complex-variable chaotic systems is in- vestigated. Both the topological structure and the system parameters can be unknown and need to be i... In this paper, structure identification of an uncertain network coupled with complex-variable chaotic systems is in- vestigated. Both the topological structure and the system parameters can be unknown and need to be identified. Based on impulsive stability theory and the Lyapunov function method, an impulsive control scheme combined with an adaptive strategy is adopted to design effective and universal network estimators. The restriction on the impulsive interval is relaxed by adopting an adaptive strategy. Further, the proposed method can monitor the online switching topology effectively. Several numerical simulations are provided to illustrate the effectiveness of the theoretical results. 展开更多
关键词 structure identification network complex-variable chaotic system impulsive control
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Crosscumulants Based Approaches for the Structure Identification of Volterra Models 认领 引用 被引量：1
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作者 Houda Mathlouthi Kamel Abederrahim +1 位作者 Faouzi Msahli Gerard Favier 《International Journal of Automation and computing》 2009年第4期420-430,共11页
In this paper, we address the problem of structure identification of Volterra models. It consists in estimating the model order and the memory length of each kernel. Two methods based on input-output crosscumulants ar... In this paper, we address the problem of structure identification of Volterra models. It consists in estimating the model order and the memory length of each kernel. Two methods based on input-output crosscumulants are developed. The first one uses zero mean independent and identically distributed Caussian input, and the second one concerns a symmetric input sequence. Simulations are performed on six models having different orders and kernel memory lengths to demonstrate the advantages of the proposed methods. 展开更多
关键词 Structure identification Volterra model crosscumulants Caussian input symmetric input
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Structure identification for compound I separated and purified from taxoids-produced endophytic fungi (Alternaria. alternata var. taxi 1011) 认领 引用 被引量：5
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作者 项勇 刘君 +1 位作者 呂安国 崔京霞 《Journal of Forestry Research》 CAS 2003年第3期217-220,共4页
Endophytic fungi are widely found in almost all kinds of plants. Many endophytic fungi can produce some physio-logical active compounds, which are same to or analog to those isolated from their hosts. Producing physio... Endophytic fungi are widely found in almost all kinds of plants. Many endophytic fungi can produce some physio-logical active compounds, which are same to or analog to those isolated from their hosts. Producing physiological active com-pounds through microbial fermentation can give a new way to resolve resource limitation and to find out alternative source. Through the methods of organic solvent extraction, thin layer chromatography (TLC) and column chromatography, compound I was isolated, purified from the liquid fermentation metabolites of the taxoids-produced endophytic fungi (Alternaria. alternata var. taxi 1011 Y. Xiang et LU An-guo) that was screened from the bark of Taxus. cuspidata Sieb.et Zucc.. Compound I was identified as one kind of taxoids type III, based on the analyzing results by using the methods of ultraviolet spectroscopy (UV), infrared spectroscopy (IR), mass spectrometry (MS) and nuclear magnetic resonance spectroscopy (NMR). This study provides a com-pleted method for separation and purification of the endophytic fungi as well as structure identification of its fermentation me-tabolite 展开更多
关键词 Alternaria. Alternata var. taxi 1011 Taxoids Separation Purification Structure identification
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Structure identification of 4-amino-2-(arylamino)thiazole-5-carboxylic esters 认领 引用
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作者 Hai-Long Zhao Hua-Long Chen +1 位作者 Jie Zhou Bai-Ling Xu 《Chinese Chemical Letters》 SCIE CAS CSCD 2016年第2期302-304,共3页
In our previous work,we found a new method by chance for the synthesis of thiazole derivatives with diversified substitutes on 2-and 5-positions of the thiazole scaffold which was published in Chinese Chemical Letters... In our previous work,we found a new method by chance for the synthesis of thiazole derivatives with diversified substitutes on 2-and 5-positions of the thiazole scaffold which was published in Chinese Chemical Letters[2014,Vol.25 p.411].The structures were identified by ~1H NMR,^（13）C NMR and HRMS as 2-alkoxy-4-amino-Narylthiazole-5-carboxamides. 展开更多
关键词 In ppm Structure identification of 4-amino-2 arylamino)thiazole-5-carboxylic esters HRMS
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Structure Identification for Force-Induced Reaction Using Single-Molecule Conductance Measurement 认领 引用 被引量：1
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作者 Jueting Zheng Wenli Gao +9 位作者 Taige Lu Lijue Chen Luchun Lin Ruiyun Huang Yongxiang Tang Gang Dong Junyang Liu Yifei Pan Wengui Weng Wenjing Hong 《CCS Chemistry》 CSCD 2023年第8期1888-1895,共8页
Spiropyran derivatives are prototype mechanophores with a promising application as molecular sensors because of their changeable structure under external force stimuli.However,the chemical structure evolution under ex... Spiropyran derivatives are prototype mechanophores with a promising application as molecular sensors because of their changeable structure under external force stimuli.However,the chemical structure evolution under external stimuli remains unclear due to the uncertainty and difficulty in distinguishing the structures of different ring-opened merocyanine isomers generated in the force-induced reaction.Here we identify the structure of isomers produced by the force-induced reaction of spiropyran derivatives using a single-molecule conductance measurement and an unsupervised clustering algorithm.We found that the original data from the single-molecule conductance measurement can be divided into four clusters through unsupervised clustering.By introducing a photoinduced reaction and theoretical calculation,we identified and attributed the four clusters of data to the multiple states of the molecular junctions.Our work demonstrates that a single-molecule break junction measurement can distinguish the isomers in the force-induced reaction,suggesting the great potential of single-molecule conductance measurement and unsupervised clustering approaches for structural analysis. 展开更多
关键词 single-molecule conductance measurements force-induced reaction unsupervised clustering structure identification
A Framework for Integrated Fire Protection of Historic Timber Buildings:A Methodology Grounded in Structural Risk Identification and Graded Intervention 认领 引用
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作者 Hanyu Zhu Huinan Liu 《Journal of World Architecture》 2026年第1期43-50,共8页
Traditional timber buildings,as a vital part of global cultural heritage,face a profound contradiction between material flammability and the preservation of heritage authenticity.Conventional fire protection methods o... Traditional timber buildings,as a vital part of global cultural heritage,face a profound contradiction between material flammability and the preservation of heritage authenticity.Conventional fire protection methods often focus on macro-spatial coverage while ignoring the complex structural features inside timber frameworks,leading to detection delays,severe water damage,and high levels of intervention.This study proposes a new paradigm of“Structural Identification-Risk Grading-Integrated Protection.”First,3D laser scanning and non-contact detection technologies are used to accurately identify fire-sensitive units such as mortise-tenon joints,hidden cavities,and bracket systems.After that,a fuzzy comprehensive evaluation(FCE)model based on a combined weighting of the analytic hierarchy process(AHP)and entropy weight method is constructed to realize the quantitative grading of fire risks for structural units.On this basis,integrated protection facilities featuring microencapsulated flame retardancy,local ultra-fine water mist,and inert gas release are designed.Finally,the integrated scheme is verified through digital twin technology and fire dynamics simulator(FDS).The results indicate that the system significantly improves fire control efficiency and reduces secondary water damage while adhering to the“minimum intervention”principle,providing a systematic technical path for the scientific protection of timber heritage. 展开更多
关键词 Historic timber buildings Fire risk Structural identification Hierarchical protection Interventional design
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Identification of the Concealed Structures in the Beiya Area of Western Yunnan 认领 引用 被引量：1
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作者 WANG Qiao YANG Jian +1 位作者 YAO Wen YANG Junbo 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2015年第5期1779-1780,共2页
The interpretation of regional gravity and magnetic data, especially the extracted information about concealed targets and structures, provide important evidence for geological structure research, oil-gas resource ass... The interpretation of regional gravity and magnetic data, especially the extracted information about concealed targets and structures, provide important evidence for geological structure research, oil-gas resource assessment, mineral potential forecast and prospective area delineation. Several interpretation methods have been proposed to determine structural boundary, including vertical derivative, horizontal first-order derivative, total horizontal derivative, total gradient modulus, tilt derivative, and theta graph, and each have their advantages and disadvantages. This study used the tilt derivate method to obtain bouguer gravity anomalies in the Beya area, as shown in Fig. 1a. 展开更多
关键词 Identification of the Concealed Structures in the Beiya Area of Western Yunnan AMT
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Structure elucidation,immunomodulatory activity,antitumor activity and its molecular mechanism of a novel polysaccharide from Boletus reticulatus Schaeff 认领 引用 被引量：10
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作者 Siyuan Su Xiang Ding +3 位作者 Yiling Hou Binbin Liu Zhouhe Du Junfeng Liu 《Food Science and Human Wellness》 SCIE CAS CSCD 2023年第2期647-661,共15页
A new water-soluble heteropolysaccharide with a molecular weight of 15 k Da was isolated from the fruiting bodies of Boletus reticulatus Schaeff.Structural characterization results revealed that B.reticulatus Schaeff ... A new water-soluble heteropolysaccharide with a molecular weight of 15 k Da was isolated from the fruiting bodies of Boletus reticulatus Schaeff.Structural characterization results revealed that B.reticulatus Schaeff polysaccharide(BRS-X)had a backbone of 1,6-linkedα-D-galactose and 1,2,6-linkedα-D-galactose which branches were mainly composed of a terminal 4-linkedβ-D-glucose and the ratio of D-galactose and D-glucose was 5:1.Bioactivity assays indicated that BRS-X displayed a strong proliferative activity in T cells and B cells and promoted the secretion of immunoglobulin G(Ig G),Ig E,Ig D and Ig M.In addition,BRS-X could facilitate the proliferation and phagocytosis of RAW264.7 cells and could significantly inhibit the growth of tumors in S180-bearing mice.The results of transcriptome sequencing analysis illustrated that total 46 genes enriched in MAPK and total 34 genes enriched in PI3 K/Akt signaling pathways in BRS-X group.The protein VEGF and VEGFR expression were significantly reduced under the treatment with BRS-X.These findings provide a scientific basis for the edible and medicinal value of BRS-X. 展开更多
关键词 Boletus reticulatus Schaeff Polysaccharides Structure identification Immunomodulatory activity Antitumor activity
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Isolation and Structural Identification of Herbicidal Active Substance from Root of Flaveria bident(L.) Kuntze 认领 引用 被引量：1
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作者 HUO Jing-qian XING Ji-hong +2 位作者 ZHANG Li-hui KANG Zhan-hai ZHANG Jin-lin 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2014年第4期804-810,共7页
In order to understand the composition and structure of herbicidal active substance from the root of Flaveria bidentis （L.） Kuntze, the isolation and structural identification were researched in this paper. The crud... In order to understand the composition and structure of herbicidal active substance from the root of Flaveria bidentis （L.） Kuntze, the isolation and structural identification were researched in this paper. The crude extract from the root ofF. bidentis （L.） Kuntze was extracted by petroleum ether, ethyl acetate, and water saturation of n-butyl alcohol, respectively, and the extraction fluid was separated by using the method of TLC, then the main fraction was separated by HPLC, and the structure of the herbicidal active substance was analyzed by LC-MS, elemental analysis and ~H-NMR. The results showed that the petroleum extraction had the strongest herbicidal activity, and the purple blue stripe separated by TLC had the strongest effect on Digitaria sanguinalis. The herbicidal active substance was identified as ct-terthienyl according to the data of LC-MS, elemental analysis and 1H-NMR. 展开更多
关键词 Flaveria bidentis （L.） Kuntze herbicidal active substance isolation structure identification
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Identification of impurities in nafamostat mesylate using HPLC-ITTOF/MS:A series of double-charged ions 认领 引用
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作者 Yuxin Zhang Lufan An +3 位作者 Lin Zhang Rulin Wang Yuan Tian Zunjian Zhang 《Journal of Pharmaceutical Analysis》 SCIE CAS CSCD 2020年第4期346-350,共5页
Nafamostat mesylate is a serine protease inhibitor used in the treatment of acute pancreatitis.The impurities in nafamostat mesylate,the active pharmaceutical ingredient(API),were profiled via high performance liquid ... Nafamostat mesylate is a serine protease inhibitor used in the treatment of acute pancreatitis.The impurities in nafamostat mesylate,the active pharmaceutical ingredient(API),were profiled via high performance liquid chromatography tandem ion trap coupled with time-of-flight mass spectrometer(HPLC-IT-TOF/MS).The chromatography was performed on an ACE-3 C18 column(200 mm4.6 mm,3 mm)using methanol and 0.1%formic acid in purified water as mobile phase at a flow rate of 1.0 mL/min.The ions were detected by IT-TOF/MS with a full-scan mass analysis from m/z 100 to 800.In total,eleven impurities were detected in nafamostat mesylate API.The impurity profile was estimated based on the HPLC-IT-TOF/MS data,including accurate masses,MSn fingerprints of fragmentation pathways and a series of double-charged ions.Finally,seven impurities were identified and reported for the first time.The results will provide technical support for the quality control and clinical safety of nafamostat mesylate. 展开更多
关键词 Nafamostat mesylate Impurity Structure identification Double-charged ion
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Separation, Purification and Identification of Antioxidant Compositions in Black Rice 认领 引用 被引量：12
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作者 ZHANG Ming-wei GUO Bao-jiang +5 位作者 ZHANG Rui-fen CHI Jian-wei WEI Zhen-cheng XU Zhi-hong ZHANG Yan TANG Xiao-jun 《Agricultural Sciences in China》 2006年第6期431-440,共10页
To separate, purify and identify the antioxidative compositions of black rice, using total antioxidation capacity （TAC） as an activity-monitoring parameter, different fractions of black rice antioxidative extracts w... To separate, purify and identify the antioxidative compositions of black rice, using total antioxidation capacity （TAC） as an activity-monitoring parameter, different fractions of black rice antioxidative extracts were obtained using solvents of different polarities such as petroleum ether, chloroform, ethyl acetate and normal butyl alcohol. The main anfioxidative components were separated from the strongest antioxidative fractions by using Sephadex LH-20 resin and the structures were analyzed by ultraviolet-vis, infra-red, ESI-MS, ^1H-NMR and ^13C-NMR spectrums. Results showed that the water fraction and normal butyl alcohol antioxidafive extract fraction of black rice had the strongest antioxidation capacities and their TACs reached 383 and 392 ku g^-1, respectively. Four main antioxidative components were separated from the water fraction and their TACs reached 976, 878, 1 134 and 1087 ku g^-, respectively. The spectroscopy analysis indicated that the four active components of the antioxidative extract of black rice were four anthocyanin compounds of malvidin, pelargonidin- 3, 5-diglucoside, cyaniding-3-glucoside and cyaniding-3, 5-diglucoside. It is concluded that the anthocyanin compounds are the most important substantial foundations for antioxidation. 展开更多
关键词 black rice antioxidative composition structure identification
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Structural characterization and identification of major constituents in Radix Scrophulariae by HPLC coupled with electrospray ionization quadrupole time-of-flight tandem mass spectrometry 认领 引用 被引量：17
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作者 CHEN You-Hua QI Jin +1 位作者 HUA Jing YU Bo-Yang 《Chinese Journal of Natural Medicines》 SCIE CAS CSCD 2014年第1期47-54,共8页
AIM: To analyze the major constituents in Radix Scrophulariae(Scrophularia ningpoensis). METHOD: Radix Scrophulariae was analyzed by HPLC coupled with electrospray ionization quadrupole time-of-flight tandem mass spec... AIM: To analyze the major constituents in Radix Scrophulariae(Scrophularia ningpoensis). METHOD: Radix Scrophulariae was analyzed by HPLC coupled with electrospray ionization quadrupole time-of-flight tandem mass spectrometry(ESI-Q-TOF MS/MS). Compounds were separated by HPLC using a C18 column and gradient elution of acetonitrile and 0.1 %(V/V) acetic acid-water. Negative ion mode was employed. RESULTS: A total of thirty-six compounds, including fourteen iridoid glycosides, nineteen phenylpropanoid glycosides, and three organic acids, were identified from Radix Scrophulariae based on the accurate mass measurement of precursor and product ions. Twenty-one of the constituents were identified by comparing their retention times(tR) and ESI-MS/MS data with those of reference standards and/or previous publications, while another fifteen compounds were tentatively identified or deduced according to their Q-TOF MS/MS data which afforded sufficient structural information. CONCLUSION: It is believed that this study is useful for the identification of constituents in Radix Scrophulariae, as well as related plants and complex prescriptions. 展开更多
关键词 HPLC/ESI-Q-TOF MS/MS Radix Scrophulariae Scrophularia ningpoensis Structural identification
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Damage identification of steel truss bridges based on deep belief network 认领 引用 被引量：7
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作者 Tu Yongming Lu Senlu Wang Chao 《Journal of Southeast University(English Edition)》 EI CAS 2022年第4期392-400,共9页
To improve the accuracy and anti-noise ability of the structural damage identification method,a bridge damage identification method is proposed based on a deep belief network(DBN).The output vector is used to establis... To improve the accuracy and anti-noise ability of the structural damage identification method,a bridge damage identification method is proposed based on a deep belief network(DBN).The output vector is used to establish the nonlinear mapping relationship between the mode shape and structural damage.The hidden layer of the DBN is trained through a layer-by-layer pre-training.Finally,the backpropagation algorithm is used to fine-tune the entire network.The method is validated using a numerical model of a steel truss bridge.The results show that under the influence of noise and modeling uncertainty,the damage identification method based on the DBN can identify the accurate damage location and degree identification compared with the traditional damage identification method based on an artificial neural network. 展开更多
关键词 deep learning restricted Boltzmann machine deep belief network structural damage identification
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Systematically structural identification of nitric compounds in crude oil with chemometric resolution 认领 引用
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作者 黄熠 张泰铭 +1 位作者 梁逸曾 崔卉 《Journal of Central South University of Technology》 2005年第3期300-305,共6页
Aimed at the problem of classification of non-hydrocarbons of crude oil, the theoretical standpoint that the polarity of a compound depends on the whole structure and composition of molecule instead of a kind of heter... Aimed at the problem of classification of non-hydrocarbons of crude oil, the theoretical standpoint that the polarity of a compound depends on the whole structure and composition of molecule instead of a kind of heteroatom or its functional group was presented. A method was established for the systematically structural identification of nitric compounds in crude oil. The pre-fractionation of a crude oil sample into 7 fractions was performed by di- adsorption column chromatography with neutral aluminum oxide and silica gel. Subsequently, the individual components were obtained by using capillary column gas chromatography, and the types of compounds were detected by a mass spectrometer. In combination with a chemometric resolution, the compounds of fraction were further identified. This method can relieve the difficulty of classical analysis in identifying those species with very low contents or without being completely separated. The structures of 168 nitric compounds in a crude oil sample were determined by this method. 展开更多
关键词 column chromatography chromatography-mass spectrometry chemometric resolution structural identification non-hydrocarbon compound crude oil nitric
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Synthesis and Structure's Identification of N, N-dialkyl-2-trimethyl siloxyl-4,5-dialkyl Benzoylamino 认领 引用
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《厦门大学学报（自然科学版）》 CAS 北大核心 1999年第S1期470-470,共1页
关键词 N-dialkyl-2-trimethyl siloxyl-4,5-dialkyl Benzoylamino Synthesis and Structure’s Identification of N
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Non Ideal Schottky Barrier Diode’s Parameters Extraction and Materials Identification from Dark I-V-T Characteristics 认领 引用
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作者 M. Bashahu D. Ngendabanyikwa P. Nyandwi 《Journal of Modern Physics》 2022年第3期285-300,共16页
Several parameters of a commercial Si-based Schottky barrier diode (SBD) with unknown metal material and semiconductor-type have been investigated in this work from dark forward and reverse I-V characteristics in the ... Several parameters of a commercial Si-based Schottky barrier diode (SBD) with unknown metal material and semiconductor-type have been investigated in this work from dark forward and reverse I-V characteristics in the temperature (T) range of [274.5 K - 366.5 K]. Those parameters include the reverse saturation current (Is), the ideality factor (n), the series and the shunt resistances (Rs and Rsh), the effective and the zero bias barrier heights (ΦB and ΦB0), the product of the electrical active area (A) and the effective Richardson constant (A**), the built-in potential (Vbi), together with the semiconductor doping concentration (NA or ND). Some of them have been extracted by using two or three different methods. The main features of each approach have been clearly stated. From one parameter to another, results have been discussed in terms of structure performance, comparison on one another when extracted from different methods, accordance or discordance with data from other works, and parameter’s temperature or voltage dependence. A comparison of results on ΦB, ΦB0, n and NA or ND parameters with some available data in literature for the same parameters, has especially led to clear propositions on the identity of the analyzed SBD’s metal and semiconductor-type. 展开更多
关键词 SBD Dark Forward and Reverse I-V-T Characteristics Different Parameters Extraction Methods Identification of the Structure’s Metal and Semiconductor-Type
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Isolation and Identification of Staphylococcus chromogenes and 3 D Structural Analysis of the katA Gene 认领 引用
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作者 HU Xiu-cai LV Ai-jun +3 位作者 WANG Yi LI Xue MING Qing-lei ZHUAi-hua 《Animal Husbandry and Feed Science》 CAS 2013年第4期192-197,共6页
[Objective]Staphylococcus arthritis became an increasingly significant health problem in intensive chicken farming in China.[Method]In this study,a bacteria strain was isolated from the broiler chicken suffering from ... [Objective]Staphylococcus arthritis became an increasingly significant health problem in intensive chicken farming in China.[Method]In this study,a bacteria strain was isolated from the broiler chicken suffering from arthritis and named as the strain Gg1.[Result]It was then identified as Staphylococcus chromogenes by the biochemical tests and phylogenetic tree analysis based on 16S rDNA sequence.Furthermore,the catalase（katA）gene was amplified by PCR using the designed primers,and the expected fragment was 1 232 bp long encoding a protein of 410 amino acids that shares the conserved motifs including catalase,heme-binding ligand and active center motif.Six phosphorylation sites（Ser95,Thr96,Ser241,Ser242,Thr281,Ser338）,four conserved residues（Ser95,His216,Tyr281,Asp341）and two active sites（His56,Asn129）were demonstrated by multiple sequence alignment and homology comparisons.The homology modeling of 3D structure of katA protein was done by SWISSMODEL server based on the template retrieved from the catalase（PDB：2ISA_A）of Vibrio salmonicida.The katA protein represents a four-domain globular protein,the quality and reliability of the resulting protein structure was further verified by Ramachandran plot.[Conclusion]To our knowledge,this is the first report of S.chromogenes linked to arthritis in chicken and the bioinformatic characterization of its katA gene. 展开更多
关键词 Staphylococcus chromogenes Isolation and identification katA Sequence analysis 3D structure
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Three new alkaloids isolated from the stem tuber of Pinellia pedatisecta 认领 引用 被引量：14
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作者 DU Jing DING Jie +4 位作者 MU Zhen-Qiang GUAN Shu-Hong CHENG Chun-Ru LIU Xuan GUO De-An 《Chinese Journal of Natural Medicines》 SCIE CAS CSCD 2018年第2期139-142,共4页
The present study was designed to determine the chemical constituents of the stem tuber of Pinellia pedatisecta. The chemical constituents were isolated and purified by various chromatographic techniques, and their st... The present study was designed to determine the chemical constituents of the stem tuber of Pinellia pedatisecta. The chemical constituents were isolated and purified by various chromatographic techniques, and their structures were elucidated on the basis of physicochemical properties and spectral data. Three new alkaloids(compounds 1, 2, and 3) were obtained and identified as 9-((5-methoxypyridin-2-yl)methyl)-9 H-purin-6-amine(1), 4-(2-(2, 5-dioxopyrrolidin-1-yl)ethyl)phenyl acetate(2), and N-(9-((5-methoxypyridin-2-yl)methyl)-9 H-purin-6-yl)acetamide(3). These compounds were evaluated for their cytotoxicity against human cervical cancer He La cells. Compounds 1 and 3 significantly inhibited the proliferation of He La cells with IC50 values being 3.02 ± 0.54 and 7.16 ± 0.62 μmol·L-1, respectively. 展开更多
关键词 Pinellia pedatisecta Alkaloids Structure identification Anti-tumor
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Super deformability and thermoelectricity of bulkγ-InSe single crystals 认领 引用 被引量：4
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作者 Bin Zhang Hong Wu +7 位作者 Kunling Peng Xingchen Shen Xiangnan Gong Sikang Zheng Xu Lu Guoyu Wang Xiaoyuan Zhou 无 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第7期570-577,共8页
Indium selenide,aⅢ–Ⅴgroup semiconductor with layered structure,attracts intense attention in various photoelectric applications,due to its outstanding properties.Here,we report super deformability and thermoelectri... Indium selenide,aⅢ–Ⅴgroup semiconductor with layered structure,attracts intense attention in various photoelectric applications,due to its outstanding properties.Here,we report super deformability and thermoelectricity ofγ-In Se single crystals grown by modified Bridgeman method.The crystal structure of In Se is studied systematically by transmission electron microscopy methods combined with x-ray diffraction and Raman spectroscopy.The predominate phase ofγ-In Se with dense stacking faults and local multiphases is directly demonstrated at atomic scale.The bulkγ-In Se crystals demonstrate surprisingly high intrinsic super deformative ability which is highly pliable with bending strains exceeding12.5%and 264%extension by rolling.At the meantime,In Se also possesses graphite-like features which is printable,writable,and erasable.Finally,the thermoelectric properties ofγ-In Se bulk single crystals are preliminary studied and thermal conductivity can be further reduced via bending-induced defects.These findings will enrich the knowledge of structural and mechanical properties'flexibility of In Se and shed lights on the intrinsic and unique mechanical properties of In Se polytypes. 展开更多
关键词 γ-InSe single crystals structure identification super deformability thermoelectric properties
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Isolation and Structural Indentification of Herbicidal Toxin Fractions Produced by Pythium aphanidermatum 认领 引用 被引量：6
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作者 ZHANG Li-hui KANG Zhan-hai +2 位作者 XU Jiao XU Wen-chao ZHANG Jin-lin 《Agricultural Sciences in China》 2010年第7期995-1000,共6页
In order to understand the compsition and structure of herbicidal component of Pythium aphanidermatum,the isolation and structural indentification were researched.The culture filtrate was extracted by ethyl acetate,pe... In order to understand the compsition and structure of herbicidal component of Pythium aphanidermatum,the isolation and structural indentification were researched.The culture filtrate was extracted by ethyl acetate,petroleum,and chloroform with the same volume respectively and the activity of the crude toxin was bioassayed.The toxin was separated by using the method of thin layer chromatography(TLC),then the main fraction was separated by HPLC,and the structure was analyzed by the sepctrum of IR,13C-NMR and 1HNMR.The results showed that the ethyl acetate extracts had the strongest herbicidal activity.Using the method of TLC,the bioassay results showed that the extracts with Rf 0.19 had the strongest effect on weeds and the inhibition to Digitaria sanguinalis and Amaranthus retroflexus reached five levels,and the component was proved to be dimethyl o-phthalate from the spectrum of IR,13C-NMR and 1HNMR,which was one of the components from the toxin,and it had herbicidal activity. 展开更多
关键词 Pythium aphanidermatum toxin herbicidal structure identification
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