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| 1 | Reconstruction of Ore-controlling Structures Resulting from Magmatic Intrusion into the Tongling Ore Cluster Area during the Yanshanian Epoch显示文摘摘要:Tongling 矿石簇区域经历了集中的压缩并且联系了在 Indosinian-Yanshanian 时代期间砍,它形成了一个箱子在 caprock 的控制矿石的褶层和差错系统。在 Yanshanian 时代的 magmatic 侵入导致了多相的液体的多级式的 unmixing,导致多层、宽范围、多种形式的式样描绘的矿化作用。在 Tongling 区域的 magmatic 侵入不仅供应了必要形成矿石的材料,而且重建控制矿石的结构根据下列五条阶层边界的趋势表面模拟:志留纪泥盆纪,泥盆纪含碳,含碳二叠,中间二叠上面二叠、二叠三叠纪。这模拟的结果证明那在那里存在在上面的部分和那些在的阶层之间的重要差别更低。而上面的趋势表面是 synform,更低的趋势表面是 antiform。另外,趋势迭加邻近的床边界出现(例如,志留纪泥盆纪边界在泥盆纪含碳的边界之上迭加) 证明更低的趋势表面总是上面穿透那。而且,不同迭加的趋势表面的穿透的部分的位置和取向是类似的并且根据地区性的 E-W-trending magmatic-metallogenic 带的分发显示出 E-W-trending 带的分发。基于阶层,结构的变丑机制,和地现象的机械性质的全面分析,看起来, stratal 趋势表面的特殊特征由于 magmatic 侵入源于 jacking 进一个 E-W-trending 地下室差错以前控制的 caprock。因此,主要控制矿石的结构,在地区性的水平压缩期间形成了,被形成矿石的岩浆的垂直 jacking 功能在 Yanshanian 时代期间重建,这被推出。在形成矿石的过程期间,岩浆的本地垂直 jacking,结合了地区性的水平压缩,在液体水管网络优化了广泛的环境并且加速了多相的液体的 unmixing 后面的 magmatic 炮兵阵地。Jacking 也加强了垂直、侧面的指导液体的结构,供应为多层的炮兵阵地和多相的液体的广阔运输的更合适的物理条件。 | DENG Jun WANG Qingfei YANG Liqiang GAO Bangfei HUANG Dinghua LIU Yah XU Hao JIANG Shaoqing | 2007 | Acta Geologica Sinica(English Edition)2007，81，2： | 13 |
| 2 | An improved analytical model of cutting temperature in orthogonal cutting of Ti6Al4V显示文摘Cutting heat has significant effects on the machined surface integrity of titanium alloys in the aerospace field. Many unwanted problems such as surface burning, work hardening, and tool wear can be induced by high cutting temperatures. Therefore, it is necessary to accurately predict the cutting temperature of titanium alloys. In this paper, an improved analytical model of the cutting temperature in orthogonal cutting of titanium alloys is proposed based on the Komanduri-Hou model and the Huang-Liang model. The temperatures at points in a cutting tool, chip, and workpiece are calculated by using the moving heat source method. The tool relief angle is introduced into the proposed model, and imaginary mirrored heat sources of the shear plane heat source and the frictional heat source are applied to calculate the temperature rise in a semi-infinite medium. The heat partition ratio along the tool-chip interface is determined by the discretization method. For validation purpose, orthogonal cutting of titanium alloy Ti6Al4V is performed on a lathe by using a sharp tool. Experimental results show to be consistent well with those of the proposed model,yielding a relative difference of predicted temperature from 0.49% to 9.00%. The model demonstrates its ability of predicting cutting temperature in orthogonal cutting of Ti6Al4V. | Chenwei SHAN Xu ZHANG Bin SHEN Dinghua ZHANG | 2019 | Chinese Journal of Aeronautics2019，32，3： | 10 |
| 3 | Tectonic Constraints on the Transformation of Paleozoic Framework of Uplift and Depression in the Ordos Area显示文摘During the Paleozoic, the Ordos area in the western North China Plate was located at the intersecting position of microplates and controlled by their interaction. The structural framework in the Ordos area, which underwent transformations in the Ordovician, the Carboniferous and the Permian respectively, was dominated by the alternation of uplift and depression. The transformations of structural framework are utilized as the clues to investigate the microplates’ interacting type and its response in the Ordos area. According to the regional structural evolution, the Ordos area is simplified into an isopachous, isotropic and elastic shell model, and under proposed various boundary conditions, three series of numerical simulations corresponding to the three structural transformations are carried out to determine the detailed tectonic constraints. Numerical simulations reveal that the structure of the uplift and depression, which is similar to the actual pattern, develops only under one special boundary condition in each of the three series, indicating that the structural framework responds to the unique tectonic background. The simulation results show that in the Early Paleozoic, the L-shaped paleouplift formed nearby the southwestern corner of the Ordos area because the intensity of the compressions in the southern and western boundaries resulting from the ocean-continent collisions was similar. In the Late Paleozoic, it evolved into continent-continent (or arc-continent) interaction in the southern and northern boundaries; in the preliminary stage of the interaction, since the interface between the North China Plate and the plates on the south and north was narrow, the relative acting force was little and the regional western boundary immobile, and the structural framework in the basin was characterized by the N-S trending slender-waist-shaped uplift; as the interface between the plates expanded gradually, the extrusive force in the southern and northern boundaries of the North China Plate increased, resulting in the paleogeographic divisions showing E-W trending, and, the western boundary of the basin was extruded westward due to the intense compression inducing the local NE trending of paleogeographic division in the central area. The simulation results further reflect that the symmetry of the uplift-depression pattern is restricted by that of the boundary conditions, suggesting that the Paleozoic structural transformations of the Ordos area under boundary constraints accord with the universal physical symmetrical principle. | WANG Qingfei DENG Jun HUANG Dinghua YANG Liqiang GAO Bangfei XU Hao JIANG Shaoqing | 2006 | Acta Geologica Sinica(English Edition)2006，80，6： | 10 |
| 4 | Vibration suppression of thin-walled workpiece machining considering external damping properties based on magnetorheological fluids flexible fixture显示文摘Milling of the thin-walled workpiece in the aerospace industry is a critical process due to the high flexibility of the workpiece. In this paper, a flexible fixture based on the magnetorheological(MR) fluids is designed to investigate the regenerative chatter suppression during the machining.Based on the analysis of typical structural components in the aerospace industry, a general complex thin-walled workpiece with fixture and damping constraint can be equivalent as a rectangular cantilever beam. On the basis of the equivalent models, natural frequency and mode shape function of the thin-walled workpiece is obtained according to the Euler–Bernoulli beam assumptions. Then,the displacement response function of the bending vibration of the beam is represented by the product of all the mode shape function and the generalized coordinate. Furthermore, a dynamic equation of the workpiece-fixture system considering the external damping factor is proposed using the Lagrangian method in terms of all the mode shape function and the generalized coordinate, and the response of system under the dynamic cutting force is calculated to evaluate the stability of the milling process under damping control. Finally, the feasibility and effectiveness of the proposed approach are validated by the impact hammer experiments and several machining tests. | Ma Junjin Zhang Dinghua Wu Baohai Luo Ming Chen Bing | 2016 | Chinese Journal of Aeronautics2016，29，4： | 8 |
| 5 | Chatter stability prediction in four-axis milling of aero-engine casings with bull-nose end mill显示文摘An analytical model for chatter stability prediction in bull-nose end milling of aero-engine casings is presented in this paper. And the mechanics and dynamics variations due to the complex cutter and workpiece geometry are considered by analyzing the effects of the lead angle on the milling process. Firstly, the tool-workpiece engagement region is obtained by using a previously developed method and divided into several disk elements along the tool-axis direction.Secondly, a 3D dynamic model for stability limit calculation is developed and simplified into a 1D model in normal direction considering only the dominant mode of the workpiece. Then the cutting force coefficients, the start and exit angles corresponding to each disk element are determined. And the total stability lobe diagram is calculated using an iterative algorithm. Finally, several experimental tests are carried out to validate the feasibility and effectiveness of the proposed prediction approach. | Zhou Xu Zhang Dinghua Luo Ming Wu Baohai | 2015 | Chinese Journal of Aeronautics2015，28，6： | 7 |
| 6 | Tool Path Generation for Clean-up Machining of Impeller by Point-searching Based Method显示文摘用机器制造大扫除区域的质量在 impeller 的表演上有强烈影响。以便很快计划大扫除工具路径并且获得好完成表面质量,一个有效、柔韧的工具路径产生方法被介绍,它采用一条途径基于寻找点。用机器制造的大扫除在这提到纸为有一个球结束切割器的一个自由形态的模型是铅笔切割和多层的切切割。为铅笔切割,切割器中心位置能经由判定它是否满足距离要求被决定。在寻找的方向和跟踪方向被决定了以后,由与两分的想法采用寻找点的算法,所有切割器接触(CC ) 指,切割器地点(CL ) 指能被发现,大扫除边界罐头也很快被定义。然后,工具路径被产生。基于铅笔切割的主要概念,一个多层的切切割方法被建议,它与它的半径利用一个球结束切割器不到大扫除的设计半径区域。使用中间的虚拟切割器的一个序列把大扫除区域划分成几层并且为最后的层给尖顶高度忍耐,然后,为所有层的工具路径被计算。最后,计算机实现也在这份报纸被介绍,并且结果证明建议方法是可行的。 | TANG Ming ZHANG Dinghua LUO Ming WU Baohai | 2012 | Chinese Journal of Aeronautics2012，25，1： | 6 |
| 7 | Mechanistic identification of cutting force coefficients in bull-nose milling process显示文摘An improved method to determine cutting force coefficients for bull-nose cutters is proposed based on the semi-mechanistic cutting force model. Due to variations of cutting speed along the tool axis in bull-nose milling, they affect coefficients significantly and may bring remarkable discrepancies in the prediction of cutting forces. Firstly, the bull-nose cutter is regarded as a finite number of axial discs piled up along the tool axis, and the rigid cutting force model is exerted. Then through discretization along cutting edges, the cutting force related to each element is recalculated, which equals to differential force value between the current and previous elements. In addition, coefficient identification adopts the cubic polynomial fitting method with the slice elevation as its horizontal axis. By calculating relations of cutting speed and cutting depth, the influences of speed variations on cutting force can be derived. Thereby, several tests are conducted to calibrate the coefficients using the improved method, which are applied to later force predictions. Eventually, experimental evaluations are discussed to verify the effectiveness. Compared to the conventional method, the results are more accurate and show satisfactory consistency with the simulations. For further applications, the method is instructive to predict the cutting forces in bull-nose milling with lead or tilt angles and can be extended to the selection of cutting parameters. | Gao Ge Wu Baohai Zhang Dinghua Luo Ming | 2013 | Chinese Journal of Aeronautics2013，26，3： | 6 |
| 8 | Cutting tool temperature prediction method using analytical model for end milling显示文摘Dramatic tool temperature variation in end milling can cause excessive tool wear and shorten its life, especially in machining of difficult-to-machine materials. In this study, a new analytical model-based method for the prediction of cutting tool temperature in end milling is presented.The cutting cycle is divided into temperature increase and decrease phases. For the temperature increase phase, a temperature prediction model considering real friction state between the chip and tool is proposed, and the heat flux and tool-chip contact length are then obtained through finite element simulation. In the temperature decrease phase, a temperature decrease model based on the one-dimension plate heat convection is proposed. A single wire thermocouple is employed to measure the tool temperature in the conducted milling experiments. Both of the theoretical and experimental results are obtained with cutting conditions of the cutting speed ranging from 60 m/min to100 m/min, feed per tooth from 0.12 mm/z to 0.20 mm/z, and the radial and axial depth of cut respectively being 4 mm and 0.5 mm. The comparison results show high agreement between the physical cutting experiments and the proposed cutting tool temperature prediction method. | Wu Baohai Cui Di He Xiaodong Zhang Dinghua Tang Kai | 2016 | Chinese Journal of Aeronautics2016，29，6： | 5 |
| 9 | An automated approach to calculating the maximum diameters of multiple cutters and their paths for sectional milling of centrifugal impellers on a 4_(1/2)-axis CNC machine显示文摘Power generators and chemical engineering compressors include heavy and large centrifugal impellers. To produce these impellers in high-speed machining, a 4?-axis milling machine(or a 4-axis machine plus an indexing table) is often used in the industry, which is more rigid than a5-axis milling machine. Since impeller blades are designed with complex B-spline surfaces and impeller channels spaces vary significantly, it is more efficient to use multiple cutters as large as possible to cut a channel in sections and a blade surface in patches, instead of only using a small cutter to machine a whole blade and a channel. Unfortunately, no approach has been established to automatically calculate the largest diameters of cutters and their paths, which include the indexing table angles. To address this problem, an automated and optimization approach is proposed. Based on the structure of a 4?-axis machine, a geometric model for a cutter gouging/interfering the impeller is formulated, and an optimization model of the cutter diameter in terms of the indexing table angle is established at a cutter contact(CC) point on a blade surface. Then, the diameters of the tools,their orientations, and the indexing table angles are optimized, and each tool's paths are generated for machining its corresponding impeller section. As a test, an impeller is efficiently machined with these tools section by section; thus, this approach is valid. It can be directly used in the industry to improve efficiency of machining centrifugal impellers. | Baohai WU Zezhong C.CHEN Ming LUO Dinghua ZHANG Feiyan HAN | 2019 | Chinese Journal of Aeronautics2019，32，4： | 5 |
| 10 | Numerical study on flow and heat transfer characteristics of microchannel designed using topological optimizations method显示文摘Microchannel has demonstrated advantages in the thermal management of integrated chip. In this study, the topology optimization method is applied for designing a topological microchannel to optimize the performances of both heat dissipation and pressure drop. To validate the performance of the topological structure, the flow and heat transfer characteristics of topological microchannel under non-uniform heating flux are numerically studied. The topological structure is designed to cool a heating area of 10 mm×10 mm with 4 hotspots. Heat flux is 40 W/cm^2 in the hotspot area, while it is only 15 W/cm^2 in the rest heating area. The results of heat dissipation performance and pressure drop are compared with those of conventional straight microchannel. Numerical result shows that, compared to the straight microchannel, the hotspot temperature and pressure drop of topological microchannel can be reduced by 4 and 0.6 k Pa, respectively, under the flow rate of 2.2×10^-4 kg/s. The coefficient of performance(COP) of topological microchannel can be 16.1% better than that of straight microchannel, which can be attributed to the effects of optimized bifurcation and confluence structural of topological microchannel. | HU DingHua ZHANG ZhiWei LI Qiang | 2020 | Science China(Technological Sciences)2020，63，1： | 5 |
| 11 | Effects of Cutting Parameters on Tool Insert Wear in End Milling of Titanium Alloy Ti6A14V显示文摘Titanium alloy is a kind of typical hard-to-cut material due to its low thermal conductivity and high strength at elevated temperatures, this contributes to the fast tool wear in the milling of titanium alloys. The influence of cutting conditions on tool wear has been focused on the turning process, and their influence on tool wear in milling process as well as the influence of tool wear on cutting force coefficients has not been investigated comprehensively. To fully understand the tool wear behavior in milling process with inserts, the influence of cutting parameters on tool wear in the milling of titanium alloys Ti6Al4 V by using indexable cutters is investigated. The tool wear rate and trends under different feed per tooth, cutting speed, axial depth of cut and radial depth of cut are analyzed. The results show that the feed rate per tooth and the radial depth of cut have a large influence on tool wear in milling Ti6Al4 V with coated insert. To reduce tool wear, cutting parameters for coated inserts under experimental cutting conditions are set as: feed rate per tooth less than 0.07 mm, radial depth of cut less than 1.0 mm, and cutting speed sets between 60 and 150 m/min. Investigation on the relationship between tool wear and cutting force coefficients shows that tangential edge constant increases with tool wear and cutter edge chipping can lead to a great variety of tangential cutting force coefficient. The proposed research provides the basic data for evaluating the machinability of milling Ti6Al4 V alloy with coated inserts, and the recommend cutting parameters can be immediately applied in practical production. | LUO Ming WANG Jing WU Baohai ZHANG Dinghua | 2017 | Chinese Journal of Mechanical Engineering2017，30，1： | 4 |
| 12 | Machining Error Control by Integrating Multivariate Statistical Process Control and Stream of Variations Methodology显示文摘For aircraft manufacturing industries, the analyses and prediction of part machining error during machining process are very important to control and improve part machining quality. In order to effectively control machining error, the method of integrating multivariate statistical process control (MSPC) and stream of variations (SoV) is proposed. Firstly, machining error is modeled by multi-operation approaches for part machining process. SoV is adopted to establish the mathematic model of the relationship between the error of upstream operations and the error of downstream operations. Here error sources not only include the influence of upstream operations but also include many of other error sources. The standard model and the predicted model about SoV are built respectively by whether the operation is done or not to satisfy different requests during part machining process. Secondly, the method of one-step ahead forecast error (OSFE) is used to eliminate autocorrelativity of the sample data from the SoV model, and the T2 control chart in MSPC is built to realize machining error detection according to the data characteristics of the above error model, which can judge whether the operation is out of control or not. If it is, then feedback is sent to the operations. The error model is modified by adjusting the operation out of control, and continually it is used to monitor operations. Finally, a machining instance containing two operations demonstrates the effectiveness of the machining error control method presented in this paper. | WANG Pei ZHANG Dinghua LI Shan CHEN Bing | 2012 | Chinese Journal of Aeronautics2012，25，6： | 4 |
| 13 | Chinese expert consensus on conversion therapy for hepatocellular carcinoma(2021 edition)显示文摘Recent advances in systemic and locoregional treatments for patients with unresectable or advanced hepatocellular carcinoma(HCC)have resulted in improved response rates.This has provided an opportunity for selected patients with initially unresectable HCC to achieve adequate tumor downstaging to undergo surgical resection,a‘conversion therapy’strategy.However,conversion therapy is a new approach to the treatment of HCC and its practice and treatment protocols are still being developed.Review the evidence for conversion therapy in HCC and develop consensus statements to guide clinical practice.Evidence review:Many research centers in China have accumulated significant experience implementing HCC conversion therapy.Preliminary findings and data have shown that conversion therapy represents an important strategy to maximize the survival of selected patients with intermediate stage to advanced HCC;however,there are still many urgent clinical and scientific challenges for this therapeutic strategy and its related fields.In order to summarize and learn from past experience and review current challenges,the Chinese Expert Consensus on Conversion Therapy for Hepatocellular Carcinoma(2021 Edition)was developed based on a review of preliminary experience and clinical data from Chinese and non-Chinese studies in this field and combined with recommendations for clinical practice.Sixteen consensus statements on the implementation of conversion therapy for HCC were developed.The statements generated in this review are based on a review of clinical evidence and real clinical experience and will help guide future progress in conversion therapy for patients with HCC. | Hui-Chuan Sun Jian Zhou Zheng Wang Xiufeng Liu Qing Xie Weidong Jia Ming Zhao Xinyu Bi Gong Li Xueli Bai Yuan Ji Li Xu Xiao-Dong Zhu Dousheng Bai Yajin Chen Yongjun Chen Chaoliu Dai Rongping Guo Wenzhi Guo Chunyi Hao Tao Huang Zhiyong Huang Deyu Li Gang Li Tao Li Xiangcheng Li Guangming Li Xiao Liang Jingfeng Liu Fubao Liu Shichun Lu Zheng Lu Weifu Lv Yilei Mao Guoliang Shao Yinghong Shi Tianqiang Song Guang Tan Yunqiang Tang Kaishan Tao Chidan Wan Guangyi Wang Lu Wang Shunxiang Wang Tianfu Wen Baocai Xing Bangde Xiang Sheng Yan Dinghua Yang Guowen Yin Tao Yin Zhenyu Yin Zhengping Yu Bixiang Zhang Jialin Zhang Shuijun Zhang Ti Zhang Yamin Zhang Yubao Zhang Aibin Zhang Haitao Zhao Ledu Zhou Wu Zhang Zhenyu Zhu Shukui Qin Feng Shen Xiujun Cai Gaojun Teng Jianqiang Cai Minshan Chen Qiang Li Lianxin Liu Weilin Wang Tingbo Liang Jiahong Dong Xiaoping Chen Xuehao Wang Shusen Zheng Jia Fan 无 | 2022 | Hepatobiliary Surgery and Nutrition2022，11，2： | 4 |
| 14 | Geometric analysis of investment casting turbine blades based on digital measurement data显示文摘A turbine blade is one of the key components of the aero-engine. Its geometric shape should be inspected carefully in the production stage to ensure that it meets the tolerance specification. In the present paper, an approach for investment turbine blade geometric shape analysis based on multi-source digital measurement is presented. Its key technologies, such as measurement data collection, blade model reliable alignment, geometric shape deviation fast calculation and visualization, were investigated. Actual measurement data from a structure light measurement device and a Coordinate Measuring Machine(CMM) for turbine blades were used to validate the presented method. The experimental results show that the proposed method is accurate, quick and effective to implement. | Cheng Yunyong Wang Liya Zhu Zhenzhen Zhang Dinghua | 2014 | China Foundry2014，11，1： | 4 |
| 15 | Totally homogeneous networks显示文摘In network science,the non-homogeneity of node degrees has been a concerning issue for study.Yet,with today’s modern web technologies,the traditional social communication topologies have evolved from node-central structures into online cycle-based communities,urgently requiring new network theories and tools.Switching the focus from node degrees to network cycles could reveal many interesting properties from the perspective of totally homogenous networks or sub-networks in a complex network,especially basic simplexes(cliques)such as links and triangles.Clearly,compared with node degrees,it is much more challenging to deal with network cycles.For studying the latter,a new clique vector-space framework is introduced in this paper,where the vector space with a basis consisting of links has a dimension equal to the number of links,that with a basis consisting of triangles has the dimension equal to the number of triangles and so on.These two vector spaces are related through a boundary operator,for example mapping the boundary of a triangle in one space to the sum of three links in the other space.Under the new framework,some important concepts and methodologies from algebraic topology,such as characteristic number,homology group and Betti number,will play a part in network science leading to foreseeable new research directions.As immediate applications,the paper illustrates some important characteristics affecting the collective behaviors of complex networks,some new cycle-dependent importance indexes of nodes and implications for network synchronization and brain-network analysis. | Dinghua Shi Linyuan Lu Guanrong Chen | 2019 | National Science Review2019，6，5： | 4 |
| 16 | Simulation for the Controlling Factors of Structural Deformation in the Southern Margin of the Junggar Basin显示文摘根据结构的变丑特征的差别, Junggar 盆的南部的边缘能从东方被划分成二个片断到西方。耸出到北方的弓形的 thrust-and-fold 带在东方片断被开发。在西方的片断有三排 en 军队飞机 thrust-and-fold 带。包含地下室的式样的戳和褶层结构在第一排,和 d 琠敨攠敶瑮被开发吗? | YU Fusheng LI Xiaojian LI Dinghua FENG Zicheng LI Xueliang | 2012 | Acta Geologica Sinica(English Edition)2012，86，4： | 3 |
| 17 | Analysis of Stationary Queue Length Distribution for Geo/T-IPH/1 Queue显示文摘In this paper we study a Geo/T-IPH/1 queue model,where T-IPH denotes the discrete time phase type distribution defined on a birth-and-death process with countably many states.The queue model can be described by a quasi-birth-anddeath(QBD)process with countably phases.Using the operator-geometric solution method,we first give the expression of the operator and the joint stationary distribution.Then we obtain the probability generating function(PGF)for stationary queue length distribution and sojourn time distribution,respectively. | Hongbo Zhang Zhenting Hou Dinghua Shi | 2013 | Journal of the Operations Research Society of China2013，1，3： | 3 |
| 18 | Induced pluripotent stem cells:Landscape for studying and treating hereditary hearing loss显示文摘Hearing loss(HL) is one of the most widespread sensory disorders,affecting approximately 1 in 500 newborns.Heritable diseases of the inner ear are the leading causes of prelingual HL.Treating of hereditary HL and understanding its underlying mechanisms remain difficult challenges to otolaryngologists.As stem cells are capable of self-renewal and differentiation,they are ideally suited both for disease modeling and regenerative medicine.Recently,description of induced pluripotent stem cells(iPSCs) has allowed the field of disease modeling and personalized therapy to become far more accessible and physiologically relevant,as iPSCs can be generated from patients of any genetic background.This review briefly describes the advantages of iPSCs technology and discusses potential applications of this powerful biological tool in studying and treating hereditary HL. | Tao Peng Yunpeng Dong Ganghua Zhu Dinghua Xie | 2014 | Journal of Otology2014，9，4： | 2 |
| 19 | Intelligent design of investment casting mold based on a hybrid reasoning method显示文摘A hybrid reasoning model was proposed in which CBR(case-based reasoning)was applied to the conceptual design and RBR(rule-based reasoning)was applied to the detailed design after research of the design process and domain knowledge of the aero-engine turbine blade investment casting mold design field.In the conceptual design stage,the representation and retrieval technologies were researched which improve the retrieval efficiency.Meanwhile,RBR was used to modify the retrieval result.The experimentation shows that the approach in this study can be used to obtain a more satisfactory design result. | Jiang Ruisong Zhang Dinghua Wang Wenhu Bu Kun | 2009 | China Foundry2009，6，1： | 2 |
| 20 | The influence of Chinese sentence stress on pitch and duration显示文摘The key to improve the naturalness of the synthetic speech is to build a perfect prosodic model. Thus the preliminary study of the influence of sentence stress on prosodic features in Standard Chinese is presented, in which the relationship between duration and pitch under different sentence stress levels is revealed. The results show that: (a) The pitch is the most important factor which carries the sentence stress, with the increase of the sentence stress level, the distribution of pitch moves towards high frequency area. (b) In the case of 'Stress' and 'Light', two peaks are found in the distribution of duration, which means that the duration of some words are affected by sentence stress, but of others are not. (c) The relationship between pitch and duration in 'Normal’, 'Stress' and 'Light' are un-correlated, positive correlation and negative correlation respectively. The research lays a foundation for building a perfect prosodic model for standard Chinese speech synthesis system. The results of research are also used to classify sentence stress using a neural network, and 63% identification ratio has been obtained in an open set test. An automatic method for the sentence stress labeling is also suggested. | XU Jieping CHU Min HE Lin LU Shinan GUAN Dinghua (Institute of Acoustics, Academia Sinica Beijing 100080) | 2000 | Chinese Journal of Acoustics2000，19，3： | 2 |
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