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| 1 | Spatial and temporal trends of climate change in Xinjiang, China显示文摘在 65 个气象学的车站的从 1961 ~ 2005 的系列数据集被用来揭示气候的空间、时间的趋势的温度和降水时间在 Xinjiang 变化,中国。年度、季节的吝啬的空气温度和全部的降水用 Mann-Kendall (MK ) 测试被分析,反的距离加权(IDW ) 插值,和 R/S 方法。结果显示那:(1 ) 在过去的 45 年里增加的温度和降水,而是温度的增加比降水的更明显;(2 ) 为温度增加,更高纬度并且更高举起更快增加,不过,纬度在增加以后有更大的影响。北 Xinjiang 显示出比南部的 Xinjiang 的更快的温暖,特别在夏天;(3 )降水的增加在南部的 Xinjiang 主要在冬季发生在北 Xinjiang 并且在夏天。Ili,在 Xinjiang 有大多数降水,显示出降水的弱增加;(4 ) 尽管温度和降水一般来说增加了,增加在 Xinjiang 内是不同的;(5 ) 林中小丘索引(H) 分析显示那个气候变化将继续当前的趋势。 | LI Qihu CHEN Yaning SHEN Yanjun LI Xingong XU Jianhua | 2011 | Journal of Geographical Sciences2011，21，6： | 41 |
| 2 | Safety risk management of underground engineering in China:Progress, challenges and strategies显示文摘Underground construction in China is featured by large scale, high speed, long construction period,complex operation and frustrating situations regarding project safety. Various accidents have been reported from time to time, resulting in serious social impact and huge economic loss. This paper presents the main progress in the safety risk management of underground engineering in China over the last decade, i.e.(1) establishment of laws and regulations for safety risk management of underground engineering,(2) implementation of the safety risk management plan,(3) establishment of decision support system for risk management and early-warning based on information technology, and(4) strengthening the study on safety risk management, prediction and prevention. Based on the analysis of the typical accidents in China in the last decade, the new challenges in the safety risk management for underground engineering are identified as follows:(1) control of unsafe human behaviors;(2) technological innovation in safety risk management; and(3) design of safety risk management regulations. Finally, the strategies for safety risk management of underground engineering in China are proposed in six aspects, i.e. the safety risk management system and policy, law, administration, economy, education and technology. | Qihu Qian Peng Lin | 2016 | Journal of Rock Mechanics and Geotechnical Engineering2016，8，4： | 28 |
| 3 | ZONAL DISINTEGRATION MECHANISM OF DEEP CRACK-WEAKENED ROCK MASSES UNDER DYNAMIC UNLOADING显示文摘Size and quantity of fractured zone and non-fractured zone are controlled by cracks contained in deep rock masses.Zonal disintegration mechanism is strongly dependent on the interaction among cracks.The strong interaction among cracks is investigated using stress super-position principle and the Chebyshev polynomials expansion of the pseudo-traction.It is found from numerical results that crack nucleation,growth and coalescence lead to failure of deep crack-weakened rock masses.The stress redistribution around the surrounding rock mass induced by unloading excavation is studied.The effect of the excavation time on nucleation,growth,inter-action and coalescence of cracks was analyzed.Moreover,the inffuence of the excavation time on the size and quantity of fractured zone and non-fractured zone was given.When the excavation time is short,zonal disintegration phenomenon may occur in deep rock masses.It is shown from numerical results that the size and quantity of fractured zone increase with decreasing excavation time,and the size and quantity of fractured zone increase with the increasing value of in-situ geostress. | Xiaoping Zhou Qihu Qian Bohu Zhang | 2009 | Acta Mechanica Solida Sinica2009，22，3： | 15 |
| 4 | Theoretical analysis and experimental results of interference striation pattern of underwater target radiated noise in shallow water waveguide显示文摘在浅水里不变的波导是一个吸引人的话题在最近散发的噪音的直接波浪的三 decades.The 干扰现象在水下从海表面和海底部的目标和思考波浪能被看作浅水 waveguide.The 干扰有条纹或刻痕之状态的一个典型盒子直接波浪和它的思考的模式有效并且为更好理解浅水波导 invariant.The 的本质的全面数字干扰 pheno | LI Qihu WANG Lei WEI Chonghua LI Yi MA Xuejie YU Haichun | 2011 | Chinese Journal of Acoustics2011，30，1： | 13 |
| 5 | A new method of passive ranging for underwater target:distance information extraction based on wave guide invariant显示文摘The study of wave guide invariant in underwater acoustics is one of attracted topics in recent 30 years.The interferences of direct wave and reflect wave from sea surface and sea bottom of underwater target radiated noise inherent the information of target distance.Extraction of these distance information will provide a possible new way in passive ranging for underwater target.The theoretical analysis and the results of at sea experiments show that the LOFAR(Low Frequency Analysis Record) figure inherently contains the range and moving information of passive acoustic sources,even in the situation that the receiver is only one single hydrophone.The theoretical analysis of extraction of target distance information by using wave guide invariant is presented in this paper.It is shown that,based on the interference striation pattern of target,the hydrophone array system is possible to extract the distance information with quite high array gain.Although the mathematical constrain conditions in forming interference striation pattern are different for individual array element,but it is proved that the differences of time delays between array elements can be used in compensation of beamforming.The theoretical analysis,system simulation and some results of at sea experiment show a new way in passive ranging and target recognition. | LI Qihu | 2015 | Chinese Journal of Acoustics2015，34，2： | 9 |
| 6 | Acoustic vector sensor signal processing显示文摘声学的向量传感器同时, colocately 并且直接在声学的地里在单个点象压力一样测量粒子速度的直角的部件以便是可能的改进性能传统在水下声学的测量设备或察觉系统并且为解决扩大新想法实际在水下的声学的设计问题。尽管出现在的声学的向量传感器历史在水下声学的区域不长,但是与巨大、潜在的军人一起要求声学的向量传感器在最后一十年有强壮的发展趋势,它正在演变为中的一一个重要在水下声学的技术。在这个背景下面,我们试着在声学的向量传感器信号处理上在学习考察最近的进步,例如信号察觉, DOA 评价, beamforming 等等。 | SUN Guiqing LI Qihu ZHANG Bin | 2006 | Chinese Journal of Acoustics2006，25，1： | 7 |
| 7 | Quantitative analysis of rockburst for surrounding rocks and zonal disintegration mechanism in deep tunnels显示文摘Rock masses without pre-existing macrocracks can usually be considered as granular materials with only microcracks.During the excavation of the tunnels,microcracks may nucleate,grow and propagate through the rock matrix;secondary microcracks may appear,and discontinuous and incompatible deformation of rock masses may occur.The classical continuum elastoplastic theory is not suitable for analyzing discontinuous and incompatible deformation of rock masses.Based on non-Euclidean model of the discontinuous and incompatible deformation of rock masses,the distribution of stresses in the surrounding rock masses in deep tunnels is fluctuant or wave-like.The stress concentration at the tips of microcracks located in vicinity of stress wave crest is comparatively large,which may lead to the unstable growth and coalescence of secondary microcracks,and consequently the occurrence of fractured zones.On the other hand,the stress concentration at the tips of microcracks located around stress wave trough is relatively small,which may lead to the arrest of microcracks,and thus the non-fractured zones.The alternate appearance of stress wave crest and trough thus may induce the alternate occurrence of fractured and non-fractured zones in deep rock masses.For brittle rocks,the dissipated energy of microcrack growth is small,but the elastic strain energy stored in rock masses may be larger than the dissipated energy growths of pre-existing microcracks and secondary microcracks.The sudden release of the residual elastic strain energy may lead to rockburst.Based on this understanding,the criteria of rockburst are established.Furthermore,the relationship between rockbursts and zonal disintegration in the surrounding rock masses around deep tunnels is studied.The influences of the in-situ stresses and the physico-mechanical parameters on the distribution of rockburst zones and the ejection velocity of rock fragments are investigated in detail. | Qihu Qian1,Xiaoping Zhou2 1 Engineering Institute of Engineering Corps,PLA University of Science and Technology,Nanjing,210007,China 2 School of Civil Engineering,Chongqing University,Chongqing,400045,China | 2011 | Journal of Rock Mechanics and Geotechnical Engineering2011，3，1： | 6 |
| 8 | Dynamic strength of rocks and physical nature of rock strength显示文摘Time-dependence of rock deformation and fracturing is often ignored.However,the consideration of the time-dependence is essential to the study of the deformation and fracturing processes of materials,especially for those subject to strong dynamic loadings.In this paper,we investigate the deformation and fracturing of rocks,its physical origin at the microscopic scale,as well as the mechanisms of the time-dependence of rock strength.Using the thermo-activated and macro-viscous mechanisms,we explained the sensitivity of rock strength to strain rate.These mechanisms dominate the rock strength in different ranges of strain rates.It is also shown that a strain-rate dependent Mohr-Coulomb-type constitutive relationship can be used to describe the influence of strain rate on dynamic rock fragmentation.A relationship between the particle sizes of fractured rocks and the strain rate is also proposed.Several time-dependent fracture criteria are discussed,and their intrinsic relations are discussed.Finally,the application of dynamic strength theories is discussed. | Qihu Qian Chengzhi Qi Mingyang Wang | 2009 | Journal of Rock Mechanics and Geotechnical Engineering2009，1，1： | 5 |
| 9 | Towed line array sonar platform noise suppression based on spatial matrix filtering technology显示文摘The spatial matrix filter was designed and used for solving the problem to detect a weak target who was influenced by the strong nearby platform noise interference of the towed Une array sonar.The MFP technology and the DOA estimation technology were combined together by using the sound propagation characteristics of both target and interference.The spatial matrix filter with platform noise zero response constraint was designed by the near-field platform noise normal modes copy vectors and the far-field plane wave bearing vectors together.The optimal solution of the optimization problem for designing the spatial matrix filter was deduced directly,and it was simplified by the generalized singular value decomposition.The total response error to the plane wave bearing vectors and the total response to the platform noise copy vectors were given.The phenomena that strong interferences existed in the bearing course and blind areas existed after filtering were analyzed by the correlation between the platform noise copy vectors and the plane wave bearing vectors.It could be found from simulations that it has less blind area and higher detection ability by using the spatial matrix filtering technology. | HAN Dong LI Jian KANG Chunyu HUANG Haining LI Qihu | 2013 | Chinese Journal of Acoustics2013，32，4： | 5 |
| 10 | CFD Simulation of Fixed and Variable Pitch Vertical Axis Tidal Turbine显示文摘在这份报纸,垂直的轴的水动力学分析潮汐的汽轮机(固定沥青与可变沥青) 数字地被分析。通过汽轮机的片的二维的数字建模与不稳定的流动的模拟用 ANSYS CFX 被执行,此后 CFX,它基于平均 Reynolds 的海军司烧(RANS ) 模型。短暂模拟被做潮汐的汽轮机使用因为固定沥青和变量搭垂直的轴一个 Shear 压力运输骚乱(SST ) 计划。主要水动力学参数喜欢转矩 T,联合时刻 C M,表演 C P 的系数和转矩 C T 的系数,等等被调查。当模特儿并且协调汽轮机转子在 ICEM-CFD 被执行。而且,在在固定沥青和可变沥青之间的协调计划的差别也被提及。网孔运动选择为可变沥青汽轮机被采用。这篇文章是关于汽轮机设计和开发的进行中的研究的一部分。数字模拟结果被验证,很好被认为的分析结果由文章与汽轮机性能的参量的研究结束的爱丁堡设计有限公司表现了,比较在之间修理并且为一台四片的汽轮机的可变沥青操作。为可变沥青,我们每极小的 N 在更小的革命得到最大的 C P 和山峰力量,这被发现,尖端加速了比率。 | Qihu Sheng Syed Shah Khalid Zhimin Xiong Zhimin Xiong Ghazala Sahib Liang Zhang | 2013 | Journal of Marine Science and Application2013，12，2： | 5 |
| 11 | Experimental investigation of rigid confinement effects of radial strain on dynamic mechanical properties and failure modes of concrete显示文摘In this study,to confirm the effect of confining pressure on dynamic mechanical behavior and failure modes of concrete,a split Hopkinson pressure bar dynamic loading device was utilized to perform dynamic compressive experiments under confined and unconfined conditions.The confining pressure was achieved by applying a lateral metal sleeve on the testing specimen which was loaded in the axial direction.The experimental results prove that dynamic peak axial stress,dynamic peak lateral stress,and peak axial strain of concrete are strongly sensitive to the strain rate under confined conditions.Moreover,the failure patterns are significantly affected by the stress-loading rate and confining pressure.Concrete shows stronger strain rate effects under an unconfined condition than that under a confined condition.More cracks are created in concrete subjected to uniaxial dynamic compression at a higher strain rate,which can be explained by a thermal-activated mechanism.By contrast,crack generation is prevented by confinement.Fitting formulas of the dynamic peak stress and dynamic peak axial strain are established by considering strain rate effects(50–250 s-1)as well as the dynamic confining increase factor(DIFc). | Pengfei Liu Xiaoping Zhou Qihu Qian | 2021 | International Journal of Mining Science and Technology2021，31，5： | 4 |
| 12 | THE ZONAL DISINTEGRATION MECHANISM OF SURROUNDING ROCK AROUND DEEP SPHERICAL TUNNELS UNDER HYDROSTATIC PRESSURE CONDITION: A NON-EUCLIDEAN CONTINUUM DAMAGE MODEL显示文摘A new non-Euclidean continuum damage model is proposed to investigate the zonal disintegration phenomenon of the surrounding rocks around deep spherical tunnels under hydrostatic pressure condition as well as the total elastic stress field distributions.The elastic stress fields of the surrounding rocks around deep spherical tunnels under hydrostatic pressure condition are obtained.If the elastic stresses of the surrounding rocks satisfy the strength criterion of the deep rock masses,the number,size and location of fractured and nonfractured zones are determined.The efect of physico-mechanical parameters of the surrounding rocks on the zonal disintegration phenomenon is studied and numerical computation is carried out.It is found from numerical results that the number,size and location of fractured and non-fractured zones are sensitive to the physico-mechanical parameters of the surrounding rocks. | Xiaoping Zhou Qinghong Hou Qihu Qian Yongxing Zhang | 2013 | Acta Mechanica Solida Sinica2013，26，4： | 4 |
| 13 | THE CONSTITUTIVE RELATION OF CRACK-WEAKENED ROCK MASSES UNDER AXIAL-DIMENSIONAL UNLOADING显示文摘An accurate and effcient numerical method for solving the crack-crack interaction problem is presented. The method is mainly by means of the dislocation model, stress superposition principle and Chebyshev polynomial expansion of the pseudo-traction. This method can be applied to compute the stress intensity factors of multiple kinked cracks and multiple rows of periodic cracks as well as the overall strains of rock masses containing multiple kinked cracks under complex loads. Many complex computational examples are given. The dependence of the crack-crack interaction on the crack configuration, the geometrical and physical parameters, and loads pattern, is investigated. By comparison with numerical results under confining pressure unloading, it is shown that the crack-crack interaction under axial-dimensional unloading is weaker than those under confining pressure unloading. Numerical results for single faults and crossed faults show that the single faults are more unstable than the crossed faults. It is found from numerical results for different crack lengths and different crack spacing that the interaction among kinked cracks decreases with an increase in length of the kinked cracks and the crack spacing under axial-dimensional unloading. | Xiaoping Zhou Qihu Qian Yongxing Zhang | 2008 | Acta Mechanica Solida Sinica2008，21，3： | 4 |
| 14 | STABILITY ANALYSIS OF TWO-DIMENSIONAL LANDSLIDES SUBJECTED TO SEISMIC LOADS显示文摘In the past, the pseudo-static method used to be the most common for evaluating the stability of landslides under seismic loads, in which static forces acting on the center of gravity of a sliding body are used to consider the effects of earthquake. However, seismic loads of rock and soil differ from time and location to time and location. Obviously, it is irrational for the pseudo-static approach to be applied to solving dynamic problems. In this paper, a displacementpseudo-dynamic model is proposed to assess seismic stability of landslides, in which the sinusoidalcosinusoidal wave is applied to simulating earthquake displacement, and an 'amplification factor'of peak seismic displacement is referred to as the amplification of seismic wave when it propagates from the bottom to the top of the landslide. The effects of physico-mechanical behaviors of a sliding body on seismic stability of soil slopes are taken into account as well as inertia forces and damping forces. The sensitivity analyses on the permanent displacement and the dynamic factor of safety of landslides are studied in detail. Moreover, a large-scale Tangjiashan landslide that occurred in Wenchuan earthquake is investigated to verify the robustness and precision of the present method.It is found that the results from the present method is in good agreement with those from the previous method. | Xiaoping Zhou Qihu Qian Hao Cheng Haipeng Zhang | 2015 | Acta Mechanica Solida Sinica2015，28，3： | 3 |
| 15 | Multipath structure of the typical under-ice sound channel in the Arctic:theory and experiment显示文摘Considering the typical acoustic environment of the Arctic, this paper proposes a method based on OASES-Bellhop coupled model to rapidly analyze the multipath structure of the under-ice sound channel. Firstly the proposed model refers to ice plate as stratified elastic media with some roughness. Secondly,it uses the perturbation method and Kirchhoff approximation theory to solve the scattering loss due to the sea ice inhomogeneity. Finally, the model predicts the multipath structure of the under-ice channel through Ray theory. The results of the numerical simulation and experiment indicate that the typical Arctic sound channel presents multipath structures due to the sea ice and seabed in the range of 6 km, respectively.The sea ice reflection paths are stable,with a short multipath spread within 14 ms. The seabed reflection paths have relatively weak strength. The proposed OASES-Bellhop coupled model successfully predicts the amplitude and delay of the multipath structure with small error,which indicates the proposed model is able to analyze and predict the multipath structure of the observed acoustic environment in experiment. | LIU Chonglei HUANG Haining YIN Li LIU Na WEI Chonghua LI Qihu | 2019 | Chinese Journal of Acoustics2019，38，1： | 3 |
| 16 | The interference characteristics of platform and towed body noise in shallow water for active/passive towed array sonar显示文摘拖引的站台噪音的干扰特征源于推进器并且拖引身体因为活跃 / 被动的拖引的数组被分析。在浅水环境,反映的直接波浪和底部 / 海表面飘动,这被显示出将严重影响声纳系统的性能。为以各种各样的参数计算干扰的到达( DOA )的方向的公式例如数组深度,一些拖引电缆线,是干扰噪音的 derived.The 效果因为声纳系统的察觉性能是系统模拟的 described.The 结果为减少这些种干扰的效果提供方法。 | LI Qihu LI Shuqiu SUN Changyu YU Huabing | 2007 | Chinese Journal of Acoustics2007，26，3： | 3 |
| 17 | THE EFFECTS OF THREE-DIMENSIONAL PENNY-SHAPED CRACKS ON ZONAL DISINTEGRATION OF THE SURROUNDING ROCK MASSES AROUND A DEEP CIRCULAR TUNNEL显示文摘In this study, it was assumed that three-dimensional penny-shaped cracks existed in deep rock masses. A new non-Euclidean model was established, in which the effects of pennyshaped cracks and axial in-situ stress on zonal disintegration of deep rock masses were taken into account. Based on the non-Euclidean model, the stress intensity factors at tips of the pennyshaped cracks were determined. The strain energy density factor was applied to investigate the occurrence of fractured zones. It was observed from the numerical results that the magnitude and location of fractured zones were sensitive to micro- and macro-mechanical parameters, as well as the value of in-situ stress. The numerical results were in good agreement with the experimental data. | Xiaoping Zhou Qihu Qian Hanfei Song | 2015 | Acta Mechanica Solida Sinica2015，28，6： | 2 |
| 18 | Iterative inverse beamforming algorithm and its application in multiple targets detection of passive sonar显示文摘With the increasing of detection ability of passive sonar,the weak signal detection problem in multiple interferences becomes more and more important.In the time/bearing record(TBR) display of sonar detection,when there exist traces of multiple interferences,the identification of weak signal is difficult or impossible.The adaptive noise cancellation technique provides the theoretical basis for suppressing strong interferences.But the solution for finding the steady-state optimum filter matrix is quite difficult due to the real time calculation of inverse matrix of input data correlation matrix.The iterative inverse beamforming(IBF) algorithm for solving the optimum filter vector,which is expressed by inverse matrix of the ocean environment data,is derived in this paper,by which,the optimum filter can be eventually expressed as a sum of series simple matrices of constructed from sensor data.Based on the algorithm proposed in this paper,some examples of at sea experiment are provided.The strong interferences are cancelled and the weak signal is emerged,even it didn't appear in the conventional beamforming(CBF) processing. | LI Qihu WEI Chonghua XUE Shanhua | 2017 | Chinese Journal of Acoustics2017，36，2： | 2 |
| 19 | Research on beamforming method for dual-line array with space mismatch between the two line arrays显示文摘当在双线的数组的二个线数组之间的空格是延期和的 mismatched.The 择向性功能,延期减去 beamforming 被推出,延期和和延期减去 beamforming 的港口/右舷辨别也在理想的地位下面两个都被学习时,双线的数组的港口/右舷辨别的性能将严重被降级并且在双线的数组的二个线数组之间的空格在下面被错配的地位。分析结果证明延期减去 beamforming 有港口 / 右舷辨别的更好的性能。最后,海试用结果表明理论结果。 | WANG Huakui LI Qihu HUANG Haining YE Qinghua LI Shuqiu ZHANG Chunhua | 2008 | Chinese Journal of Acoustics2008，27，1： | 2 |
| 20 | Programmable multi-channel white noise generator显示文摘The pseudo-random number is widely applied in digital signalprocessing.The white noise number is the basis of generating random numbers ofdesired probability distributions.The design philosophy of a programmabledigital multi-channel white noise generator is proposed in this paper.In stead ofthe conventional shift register,by using high speed static RAM and digital signalprocessing chip,the multi-channel independent white noise is generated.It satis-fies the requirement in the fields of radar,sonar and communication.The analysisof design principle,block diagram and the results of system simulation is illus-trated. | LI Qihu, LIU Jinbo, YIN Li, ZHAO Guoying, LIU Wei CHENG Yufeng JIANG Hong(Institute of Acoustics. Academia Sinica Beijing 100080) | 1992 | Chinese Journal of Acoustics1992，11，3： | 2 |
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