|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Applications of terrestrial laser scanning for tunnels: a review显示文摘In recent years,the use of terrestrial laser scanning( TLS) technique in engineering surveys is gaining an increasing interest due to the advantages of non-contact,rapidity,high accuracy,and large scale. M illions of accurate 3D points( mmlevel accuracy) can be delivered by this technique with a high point density in a short time( up to 1 million points per second),which makes it a potential technique for large scale applications in engineering environments such as tunnels,bridges,and heritage buildings. Tunnels,in particular those with long lengths,create great challenges for surveyors to obtain the satisfactory scanned data. This paper presents a short history of TLS techniques used for tunnels. A general overviewof TLS techniques is given,followed by a reviewof several applications of TLS for tunnels. These applications are classified as: detecting geological features of drilling tunnels,monitoring the geometry of tunnels during excavation,making deformation measurements,and extracting features. The reviewemphasizes howTLS techniques can be used to measure various aspects of tunnels. It is clear that TLS techniques are not yet a common tool for tunnel investigations,but there is still a huge potential to excavate. | Weixing Wang Weisen Zhao Lingxiao Huang Vivian Vimarlund Zhiwei Wang | 2014 | Journal of Traffic and Transportation Engineering(English Edition)2014，1，5： | 12 |
| 2 | Novel method of improving the alignment accuracy of SINS on revolving mounting base显示文摘In the process of initial alignment for a strapdown inertial navigation system(SINS) on a stationary base,the east gyro drift rate is an important factor affecting the alignment accuracy of the azimuth misalignment angle.When the Kalman filtering algorithm is adopted in initial alignment,it yields a constant error in the estimation of the azimuth misalignment angle because the east gyro drift rate cannot be estimated.To improve the alignment accuracy,a novel alignment method on revolving mounting base is proposed.The Kalman filtering algorithm of extending the measured values is studied.The theory of spectral condition number is utilized to analyze the degrees of observability of states.Simulation results show that the estimation accuracy of the azimuth misalignment angle is greatly improved through revolving mounting base,and the proposed method is efficient in initial alignment for a medium accurate SINS. | Qian Weixing Liu Jianye Zhao Wei Zhu Yanhua | 2009 | Journal of Systems Engineering and Electronics2009，20，5： | 11 |
| 3 | Design and application of microgrid operation control system based on IEC 61850显示文摘We consider the microgrid operation control technology including design of microgrid operation control system,MG control device and control strategy.We pay much attention on microgrid operation control device which is core control device.In order to solve the contradiction of quick speed about microgrid operation mode shift and slow speed about the management system,threelayers control architecture based on IEC61850 is designed and adaptive control strategy is used on MG operation control system.The system has been applied in a distributed generation/energy storage power station.The actual operation shows that the system can be effectively and flexibly connected to distribution network. | Wen LU Yangdong ZHAO Weixing LI Hongwei DU | 2014 | Journal of Modern Power Systems and Clean Energy2014，2，3： | 8 |
| 4 | Microelectronics-embedded channel bridging and signal regeneration of injured spinal cords显示文摘Due to the dificulty in spinal cord regeneration with biological methods,the microelectronic neural bridge,a new concept based on microelectronic technology,is presented.The microelectronic system has been realized in the forms of hybrid and integrated circuits.The integrated circuits forneural signal detection,stimulation,and regeneration are realized in a CMOS process.In animal experiments with 100 toads,48 rats,and 3 rabbits,nerve signals have been successfully detected from spinal cords and sciatic nerves,and functional electrical stimulation has been carried out for spinal cords and sciatic nerves.When the microelectronic system is bridged between the controlling and stimulated nerve,the relevant motion of legs and nerve signal waveforms,which are stimulated by the evoked or spontaneous nerve signal through such a system,have been observed.Therefore,the feasibility of the presented method was demonstrated. | Zhigong Wang Xiaosong Gu Xiaoying Lǔ Zhenglin Jiang Wenyuan Li Guangming Lǔ Yufeng Wang Xiaoyan Shen Xintai Zhao Huiling Wang Zhenyu Zhang Hongmei Shen Yang Wu Weixing Shen Jingyang Zhang Dong Chen Xiaoyi Mao Huaxiang Shen | 2009 | Progress in Natural Science:Materials International2009，19，10： | 5 |
| 5 | Empirical modeling of ionospheric F2 layer critical frequency over Wakkanai under geomagnetic quiet and disturbed conditions显示文摘The hourly values of the ionospheric F2 layer critical frequency, foF2, recorded at Wakkanai ionosonde station (45.4°N, 141.7°E) have been collected to construct a middle-latitude single-station model for forecasting foF2 under geomagnetic quiet and disturbed conditions. The module for the geomagnetic quiet conditions incorporates local time, seasonal, and solar variability of climatological foF2 and its upper and lower quartiles. It is the first attempt to predict the upper and lower quartiles of foF2 to account for the notable day-to-day variability in ionospheric foF2. The validation statistically verifies that the model captures the climatological variations of foF2 with higher accuracy than IRI does. The storm-time module is built to capture the geomagnetic storm induced relative deviations of foF2 from the quiet time references. In the geomagnetically disturbed module, the storm-induced deviations are described by diurnal and semidiurnal waves, which are modulated by a modified magnetic activity index, the Kf index, reflecting the delayed responses of foF2 to geomagnetic activity forcing. The coefficients of the model in each month are determined by fitting the model formula to the observation in a least-squares way. We provide two options for the geomagnetic disturbed module, including or not including Kalman filter algorithm. The Kalman filter algorithm is introduced to optimize these coefficients in real time. Our results demonstrate that the introduction of the Kalman filter algorithm in the storm time module is promising for improving the accuracy of predication. In addition, comparisons indicate that the IRI model prediction of the F2 layer can be improved to provide better performances over this region. | LIU Jing LIU LiBo ZHAO BiQiang WAN WeiXing CHEN YiDing | 2012 | Science China(Technological Sciences)2012，55，5： | 4 |
| 6 | Preliminary experimental results by the prototype of Sanya Incoherent Scatter Radar显示文摘In the past decades,the Incoherent Scatter Radar(ISR)has been demonstrated to be one of the most powerful instruments for ionosphere monitoring.The Institute of Geology and Geophysics at the Chinese Academy of Sciences was founded to build a state-ofthe-art phased-array ISR at Sanya(18.3°N,109.6°E),a low-latitude station on Hainan Island,named the Sanya ISR(SYISR).As a first step,a prototype radar system consisting of eight subarrays(SYISR-8)was built to reduce the technical risk of producing the entire large array.In this work,we have summarized the preliminary experimental results based on the SYISR-8.The amplitude and phase among 256 channels were first calibrated through an embedded internal monitoring network.The mean oscillation of the amplitude and phase after calibration were about 1 dB and 5°,respectively,which met the basic requirements.The beam directivity was confirmed by crossing screen of the International Space Station.The SYISR-8 was further used to detect the tropospheric wind profile and meteors.The derived winds were evaluated by comparison with independent radiosonde and balloon-based GPS measurements.The SYISR-8 was able to observe several typical meteor echoes,such as the meteor head echo,range-spread trail echo,and specular trail echo.These results confirmed the validity and reliability of the SYISR-8 system,thereby reducing the technical risk of producing the entire large array of the SYISR to some extent. | XinAn Yue WeiXing Wan Han Xiao LingQi Zeng ChangHai Ke BaiQi Ning Feng Ding BiQiang Zhao Lin Jin Chen Li MingYuan Li JunYi Wang HongLian Hao Ning Zhang | 2020 | Earth and Planetary Physics2020，4，6： | 3 |
| 7 | First results of optical meteor and meteor trail irregularity from simultaneous Sanya radar and video observations显示文摘Meteoroids entering the Earth's atmosphere can create meteor trail irregularity seriously disturbing the background ionosphere. Although numerous observations of meteor trail irregularities were performed with VHF/UHF coherent scatter radars in the past, no simultaneous radar and optical instruments were employed to investigate the characteristics of meteor trail irregularity and its corresponding meteoroid. By installing multiple video cameras near the Sanya VHF radar site, an observational campaign was conducted during the period from November 2016 to February 2017. A total of 242 optical meteors with simultaneous non-specular echoes backscattered from the plasma irregularities generated in the corresponding meteor trails were identified. A good agreement between the angular positions of non-specular echoes derived from the Sanya radar interferometer and those of optical meteors was found,validating that the radar system phase offsets have been properly calibrated. The results also verify the interferometry capability of Sanya radar for meteor trail irregularity observation. The non-specular echoes with simultaneous optical meteors were detected at magnetic aspect angles greater than ~78°. Based on the meteor visual magnitude estimated from the optical data, it was found that the radar nonspecular echoes corresponding to brighter meteors survived for longer duration. This could provide observational evidence for the significance of meteoroid mass on the duration of meteor trail irregularity. On the other hand, the simultaneous radar and video common-volume observations showed that there were some cases with optical meteors but without radar non-specular echoes. One possibility could be that some of the optical meteors appeared at extremely low altitudes where meteor trail irregularities rarely occur. | GuoZhu Li BaiQi Ning Ao Li SiPeng Yang XiuKuan Zhao BiQiang Zhao WeiXing Wan | 2018 | Earth and Planetary Physics2018，2，1： | 3 |
| 8 | Monitoring traveling ionospheric disturbances using the GPS network around China during the geomagnetic storm on 28 May 2011显示文摘Larger-scale traveling ionospheric disturbances (LSTIDs) are studied using the total electron content (TEC) data observed from 246 GPS receivers in and around China during the medium storm on 28 May 2011. It is the first attempt to get the two-dimensional TEC perturbation maps in China. Two LSTID events are detected: one is in southwestern China before midnight propagating from low to middle latitude to the distance of about 1200 km with the phase front extending to about 500 km, and the other is in northeastern China after midnight propagating from middle to low latitudes to the distance of about 1200 km with the phase front extending to nearly 1400 km. By using the multichannel maximum-entropy method, we get the propagation parameters of these two LSTIDs. The LSTID that occurs before midnight has a higher horizontal phase velocity and a larger damping rate corresponding to the after midnight LSTID, and this may be caused by the relatively large vertical background TEC 0 and high atmospheric temperature in the southwest of China before midnight. According to the variations of magnetic H component observed in high latitudes, the source region for the after midnight LSTID is likely to be located 1400-2600 km east of 140°E and north of 42°N; the before midnight LSTID is propably excited by the atmospheric gravity waves (AGWs) generated by the Joule heating of the equatorial electrojet. | SONG Qian DING Feng WAN WeiXing NING BaiQi ZHAO BiQiang | 2013 | Science China Earth Sciences2013，56，5： | 2 |
| 9 | TIME-IGGCAS model validation:Comparisons with empirical models and observations显示文摘The TIME-IGGCAS (Theoretical Ionospheric Model of the Earth in Institute of Ge- ology and Geophysics, Chinese Academy of Sciences) has been developed re- cently on the basis of previous works. To test its validity, we have made compari- sons of model results with other typical empirical ionospheric models (IRI, NeQuick-ITUR, and TItheridge temperature models) and multi-observations (GPS, Ionosondes, Topex, DMSP, FORMOSAT, and CHAMP) in this paper. Several conclu- sions are obtained from our comparisons. The modeled electron density and elec- tron and ion temperatures are quantitatively in good agreement with those of em- pirical models and observations. TIME-IGGCAS can model the electron density variations versus several factors such as local time, latitude, and season very well and can reproduce most anomalistic features of ionosphere including equatorial anomaly, winter anomaly, and semiannual anomaly. These results imply a good base for the development of ionospheric data assimilation model in the future. TIME-IGGCAS underestimates electron temperature and overestimates ion tem- perature in comparison with either empirical models or observations. The model results have relatively large deviations near sunrise time and sunset time and at the low altitudes. These results give us a reference to improve the model and enhance its performance in the future. | YUE XinAn WAN WeiXing LIU LiBo NING BaiQi ZHAO BiQiang ZHANG ManLian | 2008 | Science China(Technological Sciences)2008，51，3： | 2 |
| 10 | MicroRNA-135a contributes to the development of portal vein tumor thrombus by promoting metastasis in hepatocellular carcinoma显示文摘 | Shupeng Liu Weixing Guo Jie Shi Nan Li Xiya Yu Jie Xue Xiaohui Fu Kaijian Chu Chongde Lu Jiangsha Zhao Dong Xie Mengchao Wu Shuqun Cheng Shanrong Liu | 2011 | Journal of Hepatology2011，，2： | 2 |
| 11 | GPS detection of the coseismic ionospheric disturbances following the 12 May 2008 M7.9 Wenchuan earthquake in China显示文摘Here we report two cases of coseismic ionospheric disturbances observed through a GPS network in China after the great Wenchuan earthquake at 06:28 UT on 12 May,2008.One is detected 7.9 min after the earthquake and had an intensive'N'shape oscillated waveform with a pronounced amplitude of about 1 TECU,which propagates approximately southward to the distance about 1000 km with the horizontal phase velocity of 600±84 m/s and the period of 9.5±1.3 min.The other is detected8.5 min after the earthquake and has an oscillated waveform more like a positive pulse with an amplitude of about 0.5 TECU,which propagates eastward to the distance about 800 km with the horizontal phase velocity of 720±59 m/s and the period of7.4±0.8 min.These two coseismic ionospheric disturbances are caused by the acoustic gravity waves excited by partial transformation of the acoustic waves originated from the energy release of the earthquake,somewhere near the epicenter.The directional preferences of these two coseismic ionospheric disturbances may be associated with the oblique geomagnetic field lines and the background winds filtering effect. | SONG Qian DING Feng YU Tao WAN WeiXing NING BaiQi LIU LiBo ZHAO BiQiang | 2015 | Science China Earth Sciences2015，58，1： | 2 |
| 12 | Germanium nanopyramid arrays showing near-100% absorption in the visible regime显示文摘Solar energy is regarded as one of the most plentiful sources of renewable energy. An extraordinary light-harvesting property of a germanium periodic nanopyramid array is reported in this Letter. Both our theoretical and experimental results demonstrate that the nanopyramid array can achieve perfect broadband absorption from 500- to 800-nm wavelength. Especially in the visible regime, the experimentally measured absorption can even reach 100%. Further analyses reveal that the intrinsic antireflection effect and slow-light waveguide mode play an important role in the ultra-high absorption, which is helpful for the research and development of photovoltaic devices. | Qi Han Yongqi Fu Lei Jin Jingjing Zhao Zongwei Xu Fengzhou Fang Jingsong Gao Weixing Yu | 2015 | Nano Research2015，8，7： | 2 |
| 13 | Characteristics of the ionospheric total electron content of the equatorial ionization anomaly in the Asian-Australian region during 1996–2004显示文摘 | Biqiang Zhao Weixing Wan Libo Liu Zhipeng Ren | 2009 | Annales Geophysicae2009，，229： | 1 |
| 14 | Antidepressant-like effect of liquiritin from Glycyrrhiza uralensis in chronicvariable stress induced depression model rats显示文摘 | Zhiyu Zhao Weixing Wang Hongzhu Guo | 2008 | Behav Brain Res2008，194，： | 1 |
| 15 | Antidepressant- like effects of liquiritin and isoliquiritin from Gtycyrrhiza uralensis in the forced swinuning test and tail suspension test in mice显示文摘 | Weixing Wang Xinying Hu Zhiyu Zhao | 2008 | Progress in Neuro-Psychopharmacology & Biologicalp sychiatry2008，32，5： | 1 |
| 16 | Antidepressant-like effect of liquiritin from Glycyrrhiza uralensis in chronic variable stress induced depression model rats显示文摘 | ZHAO Zhiyu WANG Weixing GUO Hongzhu | 2008 | Behav Brain Res2008，194，1： | 1 |
| 17 | Airplane extraction and identification by improved PCNN with wavelet transform and modified Zernike moments显示文摘 | Wang Weixing Zhou W Zhao X M | 2014 | The Imaging Science Journal2014，62，1： | 1 |
| 18 | In situ Carbon Modification of g-C3N4 from Urea co-Crystal with Enhanced Photocatalytic Activity Towards Degradation of Organic Dyes Under Visible Light显示文摘An in sitt strategy was introduced for synthesizing carbon modified graphitic carbon nitride(g-C3N4)by using urea/4-aminobenzoic acid(PABA)co-crystal(PABA@Urea)as precursor materials.Via co-calcination of the PABA co-former and the urea in PABA@a Urea co-crystals,C guest species were generated and compounded into g-C3Na matrix in situ by replacing the lattice N of the carbon nitride and forming carbon dots onto its layer surface.The carbon modification dramatically enhanced visible-light harvesting and charge carrier separation.Therefore.visible light photo-catalytic oxidation of methylene blue(MB)pollution in water over the carbon modified g-C3Na(C/g-C3Na)was notably improved.Up to 99%of methylene blue(MB)was eliminated within 60 min by the optima sample prepared from the PABA@Urea co-crystal with a PABA content of 0.1%(mass ratio),faster than the degrada-tion rate over bare g-C3N4.The present study demonstrates a new way to boost up the photocatalysis performance of g-C3Na,which holds great potential concerning the degradation of organic dyes from water. | ZHAO Weifeng HAO Ning ZHANG Gai MA Aijie CHEN Weixing ZHOU Hongwei YANG Dong XU Ben Bin KONG Jie | 2020 | Chemical Research in Chinese Universities2020，36，6： | 1 |
| 19 | Parameter optimal determination for Canny edge detection显示文摘 | Zhao Xiangmo Wang Weixing Wang Liping | 2011 | The Imaging Science Journal2011，59，6： | 1 |
| 20 | Recent Progresses on Ionospheric Climatology Investigations显示文摘The ionosphere varies over multiple time scales,which are classified into two categories: the climatology and weather variations.In this national report,we give a brief summary of recent progresses in ionospheric climatology with focus on(1) the seasonal variations,(2) solar cycle effects, and(3) empirical modeling of the ionosphere.The seasonal variations of the ionosphere have been explored in many works to give a more detailed picture with regional and global features at various altitudes by analyzing the observation data from various sources and models.Moreover,a series of studies reported the response of the ionosphere to solar cycle variations,which revealed some novel and detailed features of solar activity dependence of ionospheric parameters at different altitudes. These investigations have improved our understanding on the states of the ionosphere and underlying fundamental processes,provided clues to future studies on ionospheric weather,and guided ionospheric modeling,forecasting and related applications. | LIU Libo WAN Weixing CHEN Yiding LE Huijun ZHAO Biqiang | 2012 | 空间科学学报2012，32，5： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员