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Design and application of structural health monitoring system in long-span cable-membrane structure 预览
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作者 Tang Teng Yang Dong-Hui +2 位作者 Wang Lei Zhang Jian-Ren Yi Ting-Hua 《地震工程与工程振动:英文版》 SCIE EI CSCD 2019年第2期461-474,共14页
Cable-membrane structures have small rigidity and are highly sensitive to wind. Structural health monitoring is necessary to ensure the serviceability and safety of the structure. In this research, the design method o... Cable-membrane structures have small rigidity and are highly sensitive to wind. Structural health monitoring is necessary to ensure the serviceability and safety of the structure. In this research, the design method of a structural health monitoring system is using the characteristics of a cable-membrane structure. Taking the Yueyang Sanhe Airport Terminal as an example, a finite element model is established to determine the critical structural components. Next, the engineering requirements and the framework of the monitoring system are studied based on the results of numerical analysis. The specific implementation of the structural health monitoring is then carried out, which includes sensor selection, installation and wiring. The proposed framework is successfully applied to the monitoring system for the Yueyang Airport terminal building, and the synchronous acquisition of fiber Bragg grating and acceleration sensor signals is implemented in an innovative way. The successful implementation and operation of structural health monitoring will help to guarantee the safety of the cablemembrane structure during its service life. 展开更多
关键词 cable-membrane STRUCTURAL HEALTH monitoring FI nite element model SYNCHRONOUS ACQUISITION STRUCTURAL safety
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Overreliance on Net Export and Investment Impedes China’s Structural Transformation: Estimation and Analysis Based on a Multi-Sector Growth Model 预览
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作者 渠慎宁 李鹏飞 吕铁 《中国经济学人:英文版》 2019年第3期44-65,共22页
Since reform and opening-up in 1978, changes in China’s industrial structure have generally followed the pattern of “Kuznets facts” but still exhibits some unique characteristics, which led us to raise the followin... Since reform and opening-up in 1978, changes in China’s industrial structure have generally followed the pattern of “Kuznets facts” but still exhibits some unique characteristics, which led us to raise the following three questions regarding China’s structural transformation:(1) Why did the share of China’s agricultural and manufacturing employment reduce/increase intermittently rather than continuously?(2) Why did the share of China’s agricultural employment increase during certain periods? When the share of manufacturing employment reduced, why did the workforce reversely flow into agriculture rather than move to the service sector?(3) Why did growth in the share of China’s service sector employment decelerate before reaching its peak? Why did the share of employment in the industrial sector suddenly increase after an abrupt decline? This paper creates a multisector economic growth model that contains non-homothetic preferences and differentiated productivity, and incorporates the “two drivers” therein for a demand-side estimation and analysis. The result shows that China’s economic growth model driven by net export and investment is a critical factor for explaining the three questions regarding its structural transformation. This paper believes that only by implementing supply-side structural reforms, reducing the dependence on net export and investment, and achieving sustainable endogenous economic growth will China be able to expedite its industrial restructuring. 展开更多
关键词 STRUCTURAL transformation net EXPORT and INVESTMENT multi-sector economic growth model supply-side STRUCTURAL REFORMS
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Hybrid Model Based on Wavelet Decomposition for Electricity Consumption Prediction 预览
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作者 夏晨霞 王子龙 黄春容 《东华大学学报:英文版》 EI CAS 2019年第1期77-87,共11页
The effective supply of electricity is the basis of ensuring economic development and people’s normal life. It is difficult to store electricity, as leading to the production and consumption must be completed simulta... The effective supply of electricity is the basis of ensuring economic development and people’s normal life. It is difficult to store electricity, as leading to the production and consumption must be completed simultaneously. Therefore, it is of great significance to accurately predict the demand for electricity consumption for the production planning of electricity and the normal operation of the society. In this paper, a hybrid model is constructed to predict the electricity consumption in China. The structural breaks test of monthly electricity consumption in China from January 2010 to December 2016 is carried out by using the structural breaks unit root test. Based on the existence of structura breaks, the electricity consumption data are decomposed into low-frequency and high-frequency components by wavelet model, and the separated low frequency signal and high frequency signal are predicted by autoregressive integrated moving average(ARIMA) and nonlinear autoregressive neural network(NAR), respectively. Therefore the wavelet-ARIMA-NAR hybrid model is constructed. In order to compare the effect of the hybrid model, the structural time series(STS) model is applied to predicting the electricity consumption. The results of prediction error test show that the hybrid model is more accurate for electricity consumption prediction. 展开更多
关键词 ELECTRICITY consumption forecasting WAVELET DECOMPOSITION STRUCTURAL BREAKS STRUCTURAL time series(STS) model
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Research on Cohesion and Coherence of Spoken Language—A Case of Desperate Housewives 预览
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作者 罗宇晓 《海外英语》 2019年第3期233-235,共3页
This paper mainly gives a research of cohesion and coherence in the spoken language.It takes one of the most popular teleplays—Desperate Housewives as its source of language data and tries to give a rather specific a... This paper mainly gives a research of cohesion and coherence in the spoken language.It takes one of the most popular teleplays—Desperate Housewives as its source of language data and tries to give a rather specific analysis of the application of the theory of cohesion and coherence.The paper mainly focuses on the structural cohesion and non-structural cohesion as well as the context of situation,which includes thematic structure,information structure,cohesive devices,transitivity,turn-taking,adjacency pair,etc.In addition,it encourages more people to pay attention to this theory and its application so as to make a little contribution to the development of discourse analysis. 展开更多
关键词 COHESION COHERENCE STRUCTURAL COHESION NON-STRUCTURAL COHESION
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Review on Cellulose Nanocrystal Assembly for Optical Applications 预览
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作者 Dong Li Na Feng +2 位作者 SiYuan Liu Lin Gan Jin Huang 《造纸与生物质材料:英文版》 2019年第2期54-62,共9页
Cellulose nanocrystals(CNCs)can self-assemble in suspension to form chiral cholesteric structure of liquid crystal with unique birefringence phenomena,and the structural parameters strongly depend upon the aspect rati... Cellulose nanocrystals(CNCs)can self-assemble in suspension to form chiral cholesteric structure of liquid crystal with unique birefringence phenomena,and the structural parameters strongly depend upon the aspect ratio,surface structure,and physicochemical properties of CNC,along with suspension media.Many attempts have been carried out to keep this cholesteric structure in solid state via removing solvent,such as slower solvent-evaporation,rapid vacuum-filtration,and spin-casting under centrifugal force.The solid-state iridescence of the cholesteric CNC arrays has been used as structural color,and showed a great potential for the coding and securing of optical information.Moreover,to promote practical applications of such structural iridescence,the cholesteric CNC arrays have been embedded into many kinds of substrates via in-situ reaction of monomers or physical blending with polymers.However,this kind of structural iridescences may lead to misreading information.The uniaxial-orientation assembly of CNC has thus been proposed via regulating external force fields of CNC self-assembly,and successfully achieved nanoparticle assembly-induced solid-state monochrome emission based on enhanced inelastic collision theory of CNC dipoles and photons.This method can eliminate the chiral arrangement of CNC and the corresponding iridescence,and the structural monochromaticity can contribute to enhancing the accuracy of optical information.Overall,the CNC can be controllably assembled as the ordered arrays in solid state and presented structural color,and support optical anti-counterfeiting strategies different from the fluorescent technologies. 展开更多
关键词 CELLULOSE nanocrystal SELF-ASSEMBLY STRUCTURAL adjustment STRUCTURAL COLOR OPTICAL applications
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Piezoelectric Energy Analysis on Diverse Buoy Coupling with Hydrodynamic Parameters 预览
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作者 LIU Heng-xu LIU Ming +3 位作者 CHAI Yuan-chao SHU Guo-yang JING Feng-mei WANG Li-quan 《中国海洋工程:英文版》 SCIE EI CSCD 2019年第3期279-287,共9页
This paper mainly describes the influence factors of the captured energy power by huge wave energy harvesters, in which the vertical motion of buoy can transform ocean’s potential energy into piezoelectric energy pow... This paper mainly describes the influence factors of the captured energy power by huge wave energy harvesters, in which the vertical motion of buoy can transform ocean’s potential energy into piezoelectric energy power by undulating waves. Firstly, related environmental coefficients are analyzed by means of the incident wave theory. Besides, the geometric structural parameters are also analyzed and compared under optimal environmental coefficients with semi-analytical solutions. Thirdly, the numerical results also show the impact trend of hydrodynamic parameters and geometric volume on motion, voltage and power with qualitative agreement. The numerical simulation confirms that the improved structure parameters could markedly deliver sufficient power under the same conditions with long-time stability. 展开更多
关键词 SEMI-ANALYTICAL method INCIDENT wave theory PIEZOELECTRIC CANTILEVER beam HYDRODYNAMIC characteristics lumped and structural parameters
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Hydrodynamic characteristics of 30%TBP/kerosene-HNO3 solution system in an annular centrifugal contactor 预览
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作者 Hong-Lin Chen Jian-Chen Wang +1 位作者 Wu-Hua Duan Jing Chen 《核技术:英文版》 SCIE CAS CSCD 2019年第6期16-27,共12页
Annular centrifugal contactors (ACCs) have many advantages and are recognized as key solvent-extraction equipment for the future reprocessing of spent nuclear fuel (RSNF). To successfully design and operate ACCs for R... Annular centrifugal contactors (ACCs) have many advantages and are recognized as key solvent-extraction equipment for the future reprocessing of spent nuclear fuel (RSNF). To successfully design and operate ACCs for RSNF, it is necessary to understand the hydrodynamic characteristics of the extraction systems in ACCs. The phase ratio (R = Vaq/Vorg, A/O) and liquid holdup volume (V) of the ACC are important hydrodynamic characteristics. In this study, a liquid-fast-separation method was used to systematically investigate the effects of the operational and structural parameters on the V and R (A/O) of a φ20 ACC by using a 30%TBP/kerosene- HNO3 solution system. The results showed that the operational and structural parameters had different effects on the V and R (A/O) of the mixing and separating zones of the ACC, respectively. For the most frequently used structural parameters of the φ20 ACC, when the rotor speed was 3500 r/min, the total flow rate was 2.0 L/h, and the flow ratio (A/O) was 1, the liquid holdup volumes in the mixing zone and rotor were 8.03 and 14.0 mL, respectively, and the phase ratios (A/O) of the mixing zone and separating zone were 0.96 and 1.43, respectively. 展开更多
关键词 ANNULAR CENTRIFUGAL CONTACTOR Liquid-fastseparation method Phase ratio (A/O) LIQUID HOLDUP volume Structural PARAMETER Operational PARAMETER
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Advances in Computer Vision-Based Civil Infrastructure Inspection and Monitoring 预览
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作者 Billie F. Spencer Jr. Vedhus Hoskere Yasutaka Narazaki 《工程(英文)》 2019年第2期199-222,共24页
Computer vision techniques, in conjunction with acquisition through remote cameras and unmanned aerial vehicles (UAVs), offer promising non-contact solutions to civil infrastructure condition assessment. The ultimate ... Computer vision techniques, in conjunction with acquisition through remote cameras and unmanned aerial vehicles (UAVs), offer promising non-contact solutions to civil infrastructure condition assessment. The ultimate goal of such a system is to automatically and robustly convert the image or video data into actionable information. This paper provides an overview of recent advances in computer vision techniques as they apply to the problem of civil infrastructure condition assessment. In particular, relevant research in the fields of computer vision, machine learning, and structural engineering is presented. The work reviewed is classified into two types: inspection applications and monitoring applications. The inspection applications reviewed include identifying context such as structural components, characterizing local and global visible damage, and detecting changes from a reference image. The monitoring applications discussed include static measurement of strain and displacement, as well as dynamic measurement of displacement for modal analysis. Subsequently, some of the key challenges that persist toward the goal of automated vision-based civil infrastructure and monitoring are presented. The paper concludes with ongoing work aimed at addressing some of these stated challenges. 展开更多
关键词 Structural INSPECTION and MONITORING Artificial INTELLIGENCE Computer VISION Machine learning Optical flow
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The State of the Art of Data Science and Engineering in Structural Health Monitoring 预览
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作者 Yuequan Bao Zhicheng Chen +3 位作者 Shiyin Wei Yang Xu Zhiyi Tang Hui Li 《工程(英文)》 2019年第2期234-242,共9页
Structural health monitoring (SHM) is a multi-discipline field that involves the automatic sensing of structural loads and response by means of a large number of sensors and instruments, followed by a diagnosis of the... Structural health monitoring (SHM) is a multi-discipline field that involves the automatic sensing of structural loads and response by means of a large number of sensors and instruments, followed by a diagnosis of the structural health based on the collected data. Because an SHM system implemented into a structure automatically senses, evaluates, and warns about structural conditions in real time, massive data are a significant feature of SHM. The techniques related to massive data are referred to as data science and engineering, and include acquisition techniques, transition techniques, management techniques, and processing and mining algorithms for massive data. This paper provides a brief review of the state of the art of data science and engineering in SHM as investigated by these authors, and covers the compressive sampling-based data-acquisition algorithm, the anomaly data diagnosis approach using a deep learning algorithm, crack identification approaches using computer vision techniques, and condition assessment approaches for bridges using machine learning algorithms. Future trends are discussed in the conclusion. 展开更多
关键词 Structural HEALTH MONITORING MONITORING DATA COMPRESSIVE sampling Machine LEARNING DEEP LEARNING
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Domestication&Foreignization and structural shifts in the translation of Vandals in Open Secrets 预览
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作者 武仁莉 《校园英语》 2019年第2期229-231,共3页
On November 2013,the Chinese translation of Alice Munro’s short story series Open Secrets has been published by Yilin Press(gongkaidemimi,2013).Open secrets is one of Alice Munro,the winner of 2013 Nobel Prize in lit... On November 2013,the Chinese translation of Alice Munro’s short story series Open Secrets has been published by Yilin Press(gongkaidemimi,2013).Open secrets is one of Alice Munro,the winner of 2013 Nobel Prize in literature’s masterpiece.(goodreads,n.d).The literary value of the book was recognized by the whole world. 展开更多
关键词 DOMESTICATION & FOREIGNIZATION STRUCTURAL SHIFTS the TRANSLATION
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Structure Optimization for Echo State Network Based on Contribution
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作者 Dingyuan Li Fu Liu +1 位作者 Junfei Qiao Rong Li 《清华大学学报自然科学版(英文版)》 EI CAS CSCD 2019年第1期97-105,共9页
Echo State Network (ESN)is a recurrent neural network with a large,randomly generated recurrent part called the dynamic reservoir.Only the output weights are modified during training.However,proper balancing of the tr... Echo State Network (ESN)is a recurrent neural network with a large,randomly generated recurrent part called the dynamic reservoir.Only the output weights are modified during training.However,proper balancing of the trade-off between the structure and performance for ESN remains a difficult task.In this paper,a structure optimized method for ESN based on contribution is proposed to simplify its network structure and improve its performance. First,we evaluate the contribution of reservoir neurons.Second,we present a pruning mechanism to remove the unimportant connection weights of reservoir neurons with low contribution.Finally,the new output weights are learned with the pseudo inverse method.The novel optimized ESN,named C-ESN,is tested on a Lorenz chaotic time-series prediction and an actual municipal sewage treatment system.The simulation results show that the C-ESN can have better prediction and generalization performance than ESN. 展开更多
关键词 NEURAL NETWORK STRUCTURAL DESIGN time-series PREDICTION
Wide bandwidth acoustic transmission via coiled-up metamaterial with impedance matching layers
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作者 Xiao Jia Yang Li +2 位作者 Yinghao Zhou Minghui Hong Ming Yan 《中国科学:物理学、力学、天文学英文版》 SCIE EI CAS CSCD 2019年第6期37-44,共8页
Many acoustic metamaterials suffer from a narrow bandwidth transmission because of the impedance mismatch at the airmetamaterial interface. In this paper, a two-dimensional impedance-matched metamaterial with broadban... Many acoustic metamaterials suffer from a narrow bandwidth transmission because of the impedance mismatch at the airmetamaterial interface. In this paper, a two-dimensional impedance-matched metamaterial with broadband transmission performance is investigated. The impedance matching layer is introduced for a gradient variation of effective impedance from the inlet of the unit to the outlet. The effective medium theory and corresponding effective model are used to explain the underlying mechanism. The improved energy transmission of our designs is demonstrated by experiment and numerical simulation within a broad frequency bandwidth over 6 kHz. Our impedance-matched design can be used to enhance sound absorption, which is expected to present improved acoustic performance in the applications of acoustic damper and muffler. 展开更多
关键词 general linear ACOUSTICS structural ACOUSTICS and vibration acoustical measurements and INSTRUMENTATION wavestructure INTERACTIONS
The Tesistan, Mexico earthquake (Mw 4.9) of 11 May 2016: seismictectonic environment and resonance vulnerability on buildings 预览
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作者 Alejandro Ramírez-Gaytán Adolfo Preciado +3 位作者 William L. Bandy Edilson F. Salazar-Monroy Miguel A. Jaimes Leonardo Alcantara 《地震工程与工程振动:英文版》 SCIE EI CSCD 2019年第3期579-595,共17页
To highlight the importance of small earthquakes in seismic hazard, a study of the 11 May 2016, Mw 4.9, Tesistan, Mexico earthquake is presented. Due to the close proximity of the event to the city, accelerations were... To highlight the importance of small earthquakes in seismic hazard, a study of the 11 May 2016, Mw 4.9, Tesistan, Mexico earthquake is presented. Due to the close proximity of the event to the city, accelerations were considerably higher than those caused by historical severe earthquakes (6.0 < Mw < 8.2). This paper addresses two objectives related to the Tesistan event: the fi rst is to estimate the focal mechanism solution in order to place the event in the context of the tectonic environment of this area. The second is focused on a vulnerability evaluation of buildings that suff ered resonance. Several building′s typologies with variations in construction system and height are assessed in terms of resonance with the structural and soil periods. The results show that around the Zapopan station, strong damage is expected in intermediate to high-rise buildings (12-30 m) with moment resistant frame systems and in reinforced concrete shear walls. Masonry structures around this station may not present resonance. In contrast, in the surroundings of the Guadalajara station, all intermediate height buildings from 9 to 21 m may present resonance. 展开更多
关键词 Tesistan EARTHQUAKE SEISMICITY of Guadalajara SITE eff ECTS structural VULNERABILITY
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Multiphysics simulation method of Lamb wavepropagation with piezoelectric transducers under load condition
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作者 Lei QIU Xixi YAN +1 位作者 Xiaodong LIN Shenfang YUAN 《中国航空学报:英文版》 SCIE EI CAS CSCD 2019年第5期1071-1086,共16页
Lamb Wave(LW) simulation under time-varying conditions is an effective and low cost way to study the problem of the low reliability of the structural health monitoring methods based on the LW and Piezoelectric Transdu... Lamb Wave(LW) simulation under time-varying conditions is an effective and low cost way to study the problem of the low reliability of the structural health monitoring methods based on the LW and Piezoelectric Transducer(PT). In this paper, a multiphysics simulation method of the LW propagation with the PTs under load condition is proposed. With this method, two key mechanisms of the load influence on the LW propagation are considered and coupled with each other. The first mechanism is the acoustoelastic effect which is the main reason of the LW velocity change. The second key mechanism is the load influence on piezoelectric materials, which results in a change of the amplitude. Based on the computational platform of the COMSOL Multiphysics, a multiphysics simulation model of the LW propagation with the PTs under load condition is established. The simulation model includes two physical phenomena. The first one is called solid mechanics, which is used to simulate the acoustoelastic effect being combined with the hyperelastic material properties of the structure in which the LW propagates. The second one is called electromechanical coupling, which considers the simulation of the piezoelectric effect of the PTs for the LW excitation and sensing. To simulate the load influence on piezoelectric materials, a non-linear numerical model of the relationship between the load and the piezoelectric coefficient d31 is established based on an experiment of the load influence on the LW. The simulation results under uniaxial tensile load condition are obtained and are compared with the data obtained from the experiment. It shows that the variations of the phase velocity and amplitude of the LW obtained from the simulation model match the experimental results well. 展开更多
关键词 Acoustoelastic effect LAMB wave MULTIPHYSICS simulation PIEZOELECTRIC COEFFICIENT Structural health monitoring TIME-VARYING condition
嵊州硅藻土的微观结构特征及其力学性质研究 预览
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作者 方遥越 蒋军 姜煌辉 《低温建筑技术》 2019年第2期75-77,81共4页
硅藻土作为一种特殊土体,明确其微观结构和物理力学性质,是开展硅藻土地基的工程勘测、设计的关键。以强结构性嵊州天然硅藻土为研究对象,采用多种试验手段从微观结构、物理力学特性等方面进行较为全面的研究。结果表明,硅藻土具有独特... 硅藻土作为一种特殊土体,明确其微观结构和物理力学性质,是开展硅藻土地基的工程勘测、设计的关键。以强结构性嵊州天然硅藻土为研究对象,采用多种试验手段从微观结构、物理力学特性等方面进行较为全面的研究。结果表明,硅藻土具有独特的多孔微观结构,具有高压缩性和强结构性,宏观的物理力学性质与硅藻土的多重孔隙密切相关。所得结论对指导硅藻土地区的工程勘察和工程试验具有参考价值。 展开更多
关键词 硅藻土 物理力学性质 结构性 微观结构
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Recent Progress on Functional Genomics Research of Enterovirus 71
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作者 Huiqiang Wang Yuhuan Li 《中国病毒学:英文版》 CAS CSCD 2019年第1期9-21,共13页
Enterovirus 71(EV71) is one of the main pathogens that causes hand-foot-and-mouth disease(HFMD). HFMD caused by EV71 infection is mostly self-limited;however, some infections can cause severe neurological diseases, su... Enterovirus 71(EV71) is one of the main pathogens that causes hand-foot-and-mouth disease(HFMD). HFMD caused by EV71 infection is mostly self-limited;however, some infections can cause severe neurological diseases, such as aseptic meningitis, brain stem encephalitis, and even death. There are still no effective clinical drugs used for the prevention and treatment of HFMD. Studying EV71 protein function is essential for elucidating the EV71 replication process and developing anti-EV71 drugs and vaccines. In this review, we summarized the recent progress in the studies of EV71 noncoding regions(50 UTR and 30 UTR) and all structural and nonstructural proteins, especially the key motifs involving in viral infection, replication, and immune regulation. This review will promote our understanding of EV71 virus replication and pathogenesis, and will facilitate the development of novel drugs or vaccines to treat EV71. 展开更多
关键词 ENTEROVIRUS 71 (EV71) FUNCTIONAL GENOMICS Structural PROTEIN Nonstructural PROTEIN VIRAL PROTEIN function
Structural geology and favorable exploration prospect belts in northwestern Sichuan Basin, SW China 预览
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作者 CHEN Zhuxin LI Wei +5 位作者 WANG Lining LEI Yongliang YANG Guang ZHANG Benjian YIN Hong YUAN Baoguo 《石油勘探与开发:英文版》 2019年第2期413-425,共13页
The northwestern Sichuan region has experienced multi-stage tectonic evolution including marine cratonic basin from the Sinian to the Middle Triassic and intra-continental basin from the Late Triassic to the Cenozoic.... The northwestern Sichuan region has experienced multi-stage tectonic evolution including marine cratonic basin from the Sinian to the Middle Triassic and intra-continental basin from the Late Triassic to the Cenozoic. Several regional tectonic activities caused complicated stratigraphic distribution and structural deformations in the deep-buried layers. During the key tectonic periods, some characteristic sedimentary and deformation structures were formed, including the step-shaped marginal carbonate platform of Dengying Formation, the western paleo-high at the end of Silurian, and the passive continental margin of the Late Paleozoic–Middle Triassic. The Meso-Cenozoic intra-continental compressional tectonic processes since the Late Triassic controlled the formation of complex thrusting structures surrounding and inside the northwestern basin. The northern Longmenshan fold-thrust belt has a footwall in-situ thrust structure,which is controlled by two sets of detachments in the Lower Triassic and Lower Cambrian and presents as a multi-level deformation structure with the shallow folds, the middle thin-skin thrusts and the deeper basement-involved folds. The thrust belt in front of the Micangshan Mountain shows a double-layer deformation controlled by the Lower Triassic salt detachment, which is composed by the upper monocline and deep-buried imbricate thrust structures. The interior of the basin is characterized by several rows of large-scale basement-involved folds with NEE strike direction. From the perspective of structural geology, the favorable exploration reservoirs and belts in northwestern Sichuan have obvious zoning characteristics. The favorable exploration layers of Dengying Formation of Upper Sinian are mainly distributed in the eastern and northern areas of the northwestern Sichuan Basin, in which the Jiulongshan structural belt, Zitong syncline and Yanting slope are the most favorable. The Lower Paleozoic was transformed by Caledonian paleo-uplift and late Cenozoic folding, and the midwest area suc 展开更多
关键词 NORTHWESTERN Sichuan Basin fold-thrust belt MULTI-LEVEL DETACHMENT SINIAN PALEOZOIC platform margin paleohigh structural deformation tectonic evolution hydrocarbon exploration
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Growth behavior and electronic properties of Gen+1 and AsGen(n = 1–20) clusters: a DFT study 预览
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作者 M.Benaida K.E.Aiadi +3 位作者 S.Mahtout S.Djaadi W.Rammal M.Harb 《半导体学报:英文版》 EI CAS CSCD 2019年第3期9-17,共9页
We present a systematic computational study based on the density functional theory(DFT) aiming to high light the possible effects of one As doping atom on the structural, energetic, and electronic properties of differ... We present a systematic computational study based on the density functional theory(DFT) aiming to high light the possible effects of one As doping atom on the structural, energetic, and electronic properties of different isomers of Gen+1 clusters with n = 1–20 atoms. By considering a large number of structures for each cluster size, the lowest-energy isomers are determined. The lowest-energy isomers reveal three-dimensional structures starting from n = 5. Their relative stability versus atomic size is examined based on the calculated binding energy, fragmentation energy, and second-order difference of energy. Doping Gen+1 clusters with one As atom does not improve their stability. The electronic properties as a function of the atomic size are also discussed from the calculated HOMO–LUMO energy gap, vertical ionization potential, vertical electron affinity, and chemical hardness. The obtained results are significantly affected by the inclusion of one As atom into a Gen cluster. 展开更多
关键词 DENSITY FUNCTIONAL theory As–Ge CLUSTERS structural PROPERTIES ELECTRONIC PROPERTIES
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Control performance comparison between tuned liquid damper and tuned liquid column damper using real-time hybrid simulation 预览
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作者 Zhu Fei Wang Jinting +1 位作者 Jin Feng Lu Liqiao 《地震工程与工程振动:英文版》 SCIE EI CSCD 2019年第3期695-701,共7页
Tuned liquid damper (TLD) and tuned liquid column damper (TLCD) are two types of passive control devices that are widely used in structural control. In this study, a real-time hybrid simulation (RTHS) technique is emp... Tuned liquid damper (TLD) and tuned liquid column damper (TLCD) are two types of passive control devices that are widely used in structural control. In this study, a real-time hybrid simulation (RTHS) technique is employed to investigate the diff erence in control performance between TLD and TLCD. A series of RTHSs is presented with the premise of the same liquid length, mass ratio, and structural parameters. Herein, TLD and TLCD are physically experimented, and controlled structures are numerically simulated. Then, parametric studies are performed to further evaluate the diff erent performance between TLD and TLCD. Experimental results demonstrate that TLD is more eff ective than TLCD under diff erent amplitude excitations. 展开更多
关键词 tuned LIQUID DAMPER tuned LIQUID COLUMN DAMPER REAL-TIME hybrid simulation CONTROL effi ciency structural CONTROL PARAMETRIC study
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Loss of heterozygosity by SCRaMbLEing
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作者 Yunxiang Li Yi Wu +3 位作者 Lu Ma Zhou Guo Wenhai Xiao Yingjin Yuan 《中国科学:生命科学英文版》 SCIE CAS CSCD 2019年第3期381-393,共13页
Genetic variation drives phenotypic evolution within populations.Genetic variation can be divided into different forms according to the size of genomic changes.However,study of large-scale genomic variation such as st... Genetic variation drives phenotypic evolution within populations.Genetic variation can be divided into different forms according to the size of genomic changes.However,study of large-scale genomic variation such as structural variation and aneuploidy is still limited and mainly based on the static,predetermined feature of individual genomes.Here,using SCRaMbLE,different levels of loss of heterozygosity(LOH)events including short-range LOH,long-range LOH and whole chromosome LOH were detected in evolved strains.By contrast,using rapid adaptive evolution,aneuploidy was detected in the adaptive strains.It was further found that deletion of gene GLN3,long-range LOH in the left arm of synthetic chromosomeⅩ,whole chromosome LOH of synthetic chromosomeⅩ,and duplication of chromosomeⅧ(trisomy)lead to increased rapamycin resistance in synthetic yeast.Comparative analysis of genome stability of evolved strains indicates that the aneuploid strain has a higher frequency of degeneration than the SCRaMbLEd strain.These findings enrich our understanding of genetic mechanism of rapamycin resistance in yeast,and provide valuable insights into yeast genome architecture and function. 展开更多
关键词 SCRAMBLE loss of heterozygosity(LOH) rapid adaptive evolution ANEUPLOIDY structural variation synthetic YEAST GENOME
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