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Identifying crack initiation stress threshold in brittle rocks using axial strain stiffness characteristics

Journal of Mountain Science 2018年第6期15卷 1371-1382页

作者： GAO Mei-ben LI Tian-bin MENG lu-bo MA Chun-chi XING Hui-lin state key laboratory of geohazard prevention and geoenvironment protection chengdu university of technologyChengdu 610059China college of environment and civil engineering chengdu university of technologyChengdu 610059China centre for geoscience computing school of earth sciencesthe university of queenslandSt Lucia.QLD 4072Australia

As an estimate for the in-situ spalling strength around massive underground excavations to moderately jointed brittle rocks, crack initiation stress marks the initiation of rock micro fracturing. It is crucial to accurately identify crack initiation stress level by proper method. In this study, confined compression tests of sandstone samples are used to examine the validity/applicability of proposed axial strain stiffness method. The results show that by highlighting the minuscule changes in stress-strain curve, the axial strain stiffness curve provided further insight into rock failure process and revealed five stages:(a) irregular fluctuation,(b) nearly horizontal regular fluctuation,(c) irregular fluctuation gradually decreasing to zero,(d) extreme fluctuation, and(e) near zero, which mainly correspond to five stages of stress–strain curve. The ratio of crack-initiation stress to peak strength determined using this approach is 0.44–0.51, similar to the ranges previously reported by other researchers. In this method, the key is to accurately detect the end point of the stage(b), "nearly horizontal regular fluctuation" characterized by a sudden change in axial strain stiffness curve, and the sudden change signifies crack initiation in rock sample. Finally, the research indicates that the axial strain stiffness curve can provide a mean to identify the crack-initiation stress thresholds in brittle rocks.

关键词： Brittle rock fracture Rock failure Sandstone Crack initiation stress Axial strain-stiffness Triaxial test

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Morphology and molecular phylogeny of two colepid species from China, Coleps amphacanthus Ehrenberg, 1833 and Levicoleps biwae jejuensis Chen et al., 2016 （Ciliophora, Prostomatida）

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Zoological Research 2016年第3期37卷 176-185页

作者： bo-Rong lu Ming-Zhen MA Feng GAO Yu-Hong SHI Xiang-Rui CHEN School of Marine Sciences Ningbo University Ningbo 315211 China Institute of Evolution & Marine Biodiversity Ocean University of China Qingdao 266003 China

Two colepid ciliates, Coleps amphacanthus Ehrenberg, 1833 and Levicoleps biwae jejuensis Chen et al., 2016, were first recorded in China. Their living morphology, infraciliature and small subunit （SSU） rRNA gene sequences were determined using standard methods. The improved diagnosis of Coleps amphacanthus is as follows： cell size about 100x 50 pm in vivo, barrel-shaped; 22-28 ciliary rows each composed of about 14-21 monokinetids and two perioral dikinetids; 5-10 caudal cilia; and one terminal contractile vacuole. Levicoleps biwae jejuensis was also investigated, with an improved diagnosis given based on previous and present work. The phylogenetic analyses based on SSU rRNA gene sequences revealed that all Coleps species were grouped together, except for Coleps amphacanthus, which was grouped into a clade of the genus Levicoleps.

关键词： Ciliate Coleps Levicoleps New record Phylogeny SSU rRNA Taxonomy

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A randomized controlled clinical trial: Interruption of intrauterine transmission of hepatitis B virus infection with HBIG

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World Journal of Gastroenterology 2006年第21期12卷 3434-3437页

作者： Qin XH Lin Xi-ao Xiao-bo lu Yue-Xin Zhang Xia Cai School of public Health Xinjiang Medical University Urumqi 830054 Xinjiang Uygur Autonomous Region China The First Affiliated Hospital Xinjiang Medical University Urumqi 830054 Xinjiang Uygur Autonomous Region China

AIM： To evaluate the efficacy of interruption of intrauterine infection of HBV with HBIG in pregnant women with positive HBeAg and ***： A prospective randomized controlled trial was adopted. Sixty cases with positive HBeAg and HBsAg were coincident with the criteria of inclusion, and 8 cases were excluded. Fifty-two cases were analyzed （28 cases in trial group and 24 in control group）. All cases in trial group received 200 IU HBIG intravenously every 4 wk for 3 times from the 28^th wk. The cases of control group received placebo in the same way. All pregnant women were detected for HBeAg and HBV-DNA at the beginning of the trial and end of the trial （delivery）. The cord blood of all newborns were collected for detecting HBeAg and HBV-DNA ***： For investigation of HBeAg of newborns in trial group, 6 of 28 cases of newborns had positive HBeAg, the HBeAg positive rate being 21.4%, the total rate of 95% CI being 8%-41%. In control group, 19 of 24 cases of newborns had positive HBeAg, HBeAg positive rate was 79.2%, the rate of 95%CI being 5%-93%. By statistical analysis, 2= 17.26, P 〈 0.01, RR = 0.27, 95% CI （6.3 × 10^-6, 8.6 × 10^-5）. For investigation of HBV-DNA of newborns in trial group, 7 of 28 cases of newborns had positive HBV-DNA, HBV-DNA positive rate being 25%, the total rate of 95% CI being 11%-45%. In control group, 20 of 24 cases of newborns had positive HBV-DNA, HBV-DNA positive rate was 83.3%, the total rate of 95% CI being 63%-95%. By statistical analysis, X^2 = 17.62, P 〈 0.01, RR = 0.30, 95% CI （1.5 × 10^-5, 1.7× 10^-4）. The results indicated that there was significant difference in HBeAg positive rate and HBV-DNA positive rate of newborns between the two groups. In trial group, 7 of 28 newborns had HBV-DNA positive, but the HBV-DNA load of newborns was lower than that of their mothers. In control group, 20 of 24 newborns still had HBV-DNA positive, and the HBV-DNA load of newborns was close to those of their mothers. Statis

关键词： Interruption Intrauterine Transmission Hepatitis B virus HBIG

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Research on Maneuver Decision-Making of Multi-Agent Adversarial Game in a Random Interference Environment

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Computers, Materials & Continua 2024年第10期81卷 1879-1903页

作者： Shiguang Hu Le Ru bo lu Zhenhua Wang Xiaolin Zhao Wenfei Wang Hailong Xi Equipment Management and UAV Engineering College Air Force Engineering UniversityXi’an710051China National Key Laboratory of Unmanned Aerial Vehicle Technology Xi’an710051China College of Information Technology Nanjing Police UniversityNanjing210023China

The strategy evolution process of game players is highly uncertain due to random emergent situations and other external *** paper investigates the issue of strategy interaction and behavioral decision-making among game players in simulated confrontation scenarios within a random interference *** considers the possible risks that random disturbances may pose to the autonomous decision-making of game players,as well as the impact of participants’manipulative behaviors on the state changes of the players.A nonlinear mathematical model is established to describe the strategy decision-making process of the participants in this ***,the strategy selection interaction relationship,strategy evolution stability,and dynamic decision-making process of the game players are investigated and verified by simulation *** results show that maneuver-related parameters and random environmental interference factors have different effects on the selection and evolutionary speed of the agent’s *** in a highly uncertain environment,even small information asymmetry or miscalculation may have a significant impact on *** also confirms the feasibility and effectiveness of the method proposed in the paper,which can better explain the behavioral decision-making process of the agent in the interaction *** study provides feasibility analysis ideas and theoretical references for improving multi-agent interactive decision-making and the interpretability of the game system model.

关键词： Behavior decision-making stochastic evolutionary game nonlinear mathematical modeling multi-agent maneuver

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The Third Initial-boundary Value Problem for a Class of Parabolic Monge-Ampère Equations

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Communications in Mathematical Research 2012年第1期28卷 75-90页

作者： lu bo-QIANG LI FENG-QUAN School of Mathematical Sciences Dalian University of Technology Dalian Liaoning 116024 College of Mathematics and Information Science Nanchang Hangkong University Nanehang 330063

For the more general parabolic Monge-Ampère equations defined by the operator F （D2u ＋ σ（x））, the existence and uniqueness of the admissible solution to the third initial-boundary value problem for the equation... 详细信息

关键词： parabolic Monge-Ampere equation admissible solution the third initial-boundary value problem

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Age and Growth Characteristics of Crimson Sea Bream Paragyrops edita Tanaka in Beibu Gulf

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Journal of Ocean University of China 2008年第4期7卷 457-465页

作者： HOU Gang FENG bo lu Huosheng ZHU Junfeng Fisheries College Guangdong Ocean University Zhanjiang 524025 P. R. China

Age and growth characteristics of crimson sea bream Paragyrops edita Tanaka in Beibu Gulf were studied through bottom trawling and gillnet fleets fishing from July 2006 to December 2007. A total number of 1155 individuals, ranging from 49 to 249mm in standard length was examined. The age of the fish was determined from sagittal otoliths. One year growth was made up of one translucent and one opaque zone. A maximum likelihood estimation procedure was used to fit the Von Bertalanffy, Logistic and Gompertz growth functions to the length-at-age data. ARSS indicated that there were no significant differences in growth between sexes in the three growth models （P〉0.05）, and the Von Bertalanffy growth function Lr=292.8{1 cxp[-0.167（t＋1.l16）]} was selected as the most appropriate growth model according to Akaike＇s information criterion （AIC）.

关键词： Paragyrops edita Tanaka growth function sagittal otolith maximum likelihood estimation Beibu Gulf

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Synthesis and Antibacterial Activities of N- [（1-Aryl-3-phenyl-pyrazol- 4-yl）methylene]-2-（halo-o-hydroxyphenyl）hydrazide Derivatives

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Chemical Research in Chinese Universities 2013年第3期29卷 449-453页

作者： LIU Ya lu bo-wei lu Jun-rui XIN Chun-wei LI Jian-fa MU Jiang-bei BAO Xiu-rong College of Chemistry and Chemical Engineering Tianjin University of Technology Tianjin 300384 P. R. China College of Chemistry and Chemical Engineering Xiamen University Xiamen 361000 P. R. China

A series of novel N-[（1-aryl-3-phenyl-pyrazol-4-yl）methylene]-2-（halo-o-hydroxyphenyl）hydrazide derivatives was synthesized and the antibacterial activity of each of them was evaluated. The supposed reaction mechanism of acquiring compounds 3a--3d is that catalytic activity is enhanced by the electron-donating groups of the first phenyl ring while decreased by electron-withdrawing groups of that ring. The result of preliminary bioassay shows that the lowest minimal inhibitory concentration（MIC） of the title compounds against Escherichia coli is 2 ℃g/mL. MIC values against Monilia albiean and Staphloeoeeus aureus are as low as 4 ~g/mL. They will be a series of potential antibacterial compounds against fungi and gram-negative bacteria.

关键词： N-[(1-Aryl-3-phenyl-pyrazol-4-yl)methylene]-2-(halo-o-hydroxyphenyl)hydrazide Structure-activity rela- tionship Antibacterial activity

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A Two-Dimensional NiMoO_(4)Nanowire Electrode for the Sensitive Determination of Hydroquinone in Four Types of Actual Water Samples

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Journal of Analysis and Testing 2022年第4期6卷 382-392页

作者： Li-Wei Bai Yu-Fen Shi Xue Zhang Xue-bo Liu Feng Wu Chang Liu Jian-Feng Jia Wen-bo lu Key Laboratory of Magnetic Molecules and Magnetic Information Materials(Ministry of Education) School of Chemistry and Material ScienceShanxi Normal UniversityTaiyuan030031China School of Medicine Jiangsu UniversityZhenjiang212013China School of Grain Science and Technology Jiangsu University of Science and TechnologyZhenjiang212000China

Hydroquinone(HQ)poses immeasurable risk to human health and the natural environment on the grounds of high toxicity of organic phenolic ***,an innovative electrochemical sensor based on two-dimensional nickel molybdate nanowires(NiMoO_(4)NWs)is constructed for the ultra-sensitive determination of HQ,which can provide useful reference for the human health and environment ***-dimensional NiMoO_(4)NWs are prepared successfully through a facile hydrothermal reaction and annealing *** obtained two-dimensional NiMoO_(4)NWs are characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),high-resolution TEM(HRTEM),energy-dispersive X-ray spectroscopy(EDS)mapping and X-ray photoelectron spectroscopy(XPS).The accurate contents of Ni and Mo have been characterized by inductively coupled plasma atomic emission spectroscopy(ICP-AES),confirming that the lower content of the nickel in NiMoO_(4)NWs possesses the higher catalytic activity of *** the optimized conditions,the constructed HQ sensor exhibits satisfactory electrocatalytic activity with a low detection limit of 0.0355μmol/L(S/N=3),a wide linear range of 0.05-4600μmol/L and sensitivity of 170.064μA/(mmol cm^(2)).The sensor has been successfully applied to the detection of HQ in rainwater,tap water,domestic sewage and drinking water samples with satisfactory *** the same time,this sensor has excellent reproducibility,selectivity,and *** constructed sensor has potential practical application value and broad application prospect in human health and environmental monitoring.

关键词： NiMoO_(4)nanowire Electrochemical sensor Hydroquinone Actual water samples

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Cooling and wetting of soil decelerated ground freezingethawing processes of the active layer in Xing'an permafrost regions in Northeast China

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Advances in Climate Change Research 2023年第1期14卷 126-135页

作者： bo-Quan lu Shu-Ying ZANG Li-Quan SONG Li SUN Miao LI Di BING Heilongjiang Province Key Laboratory of Geographical Environment Monitoring and Spatial Information Service in Cold Regions Harbin Normal UniversityHarbin 150025China Heilongjiang Province Collaborative Innovation Center of Cold Region Ecological Safety Harbin 150025China

The accelerated or decelerated freezingethawing processes of the active layer in Xing'an permafrost regions are crucial for the protection of *** better understand the freezingethawing processes of the active layer and its driving factors,according to the observation from 2017 to 2020 of soil temperature and water content in the active layer of forest and peatland in two representative hemiboreal ecosystems in the Da Xing'anling Mountains,Northeast China,the study explored in detail the effects of climatic conditions and local factors on the hydrothermal and freezingethawing processes of active layer *** results showed that during the freezingethawing cycles of 2017-2020,freezing and thawing start times in the peatland and forest ecosystems soils were generally delayed,and it took longer for the active layer soil to completely thaw than to *** annual average soil temperature in the peatland's active layer(5-80 cm)was 0.7-2.0℃ lower than that in the forest,and the annual average soil moisture content on the peatland was 5.5%-26.7%higher than that in the *** with the forest ecosystem soils,the ground surface freezing time of the peatland was delayed by 3e10 d,and the freezing rate decreased by 1.1-1.5 cm d1,while the beginning time of thawing was advanced by 22-27 d,and the thawing rate decreased by 1.3-1.4 cm d^(-1).In the process of decreasing soil temperature and increasing soil moisture content,the freezing and thawing rate of the active layer would be reduced,decelerating the freezingethawing processes of the active layer in the process of decreasing soil temperature and increasing soil moisture *** results provide the key original data for studying the formation and evolution of active layer and permafrost in the Xing'an permafrost regions in Northeast China and can be used to validate the prediction of ecosystem succession under the combined influences of climate change and permafrost degradation.

关键词： Freezingethawing processes Hydrothermal dynamics Active layer Hemiboreal ecosystems Xing'an permafrost

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Adaptive scheme based on status feedback for virtual network mapping

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The Journal of China Universities of Posts and Telecommunications 2011年第5期18卷 87-94页

作者： lu bo HUANG Tao WANG Zhen-kai CHEN Jian-ya LIU Yun-jie LIU Jiang Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China

Network virtualization is considered as a powerful way to deploy different network architectures and protocols over a shared physical infrastructure. Virtual network （VN） embedding plays an important role in the network virtualization environment. Virtual network embedding is mainly about mapping virtual nodes and virtual links onto the physical network resources efficiently. However, load balancing of substrate network has not received much consideration. This paper proposes an adaptive virtual network mapping algorithm based on status feedback. The main contribution is to embed the virtual network requests according to the current load distribution of substrate network. This adaptive algorithm differentiates the residual bandwidth of substrate links and takes full advantage of the multi-path to improve the load balancing of the substrate network. Simulation experiments show that the proposed algorithm improves the load distribution of substrate network distinctly while reducing the average substrate link stress significantly.

关键词： network virtualization virtual network embedding load balancing

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