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Search Results: 1 - 10 of 104320 matches for " Tianqi Zhang "
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Acute Type B Dissection Complicated by Aortic Coarctation  [PDF]
Ashish Bahadur Singh, Zhe Yang, Tianqi Zhang, Jianhua Liu, Bikash Ale, Xueli Han
Advances in Computed Tomography (ACT) , 2017, DOI: 10.4236/act.2017.61001
Abstract: We report a case of acute type B aortic dissection complicated by coarctation of aorta in 35-year-old women. Computed tomography angiography (CTA) showed a short segment aortic narrowing with diameter of 9.2 mm a small intimal tear, a true lumen, a false lumen, a markedly thick mural thrombus and pleural effusion. Open surgical procedure was performed and the aortic coarctation (CoA) and aortic dissection were resected and a 24-mm prosthetic graft was anastomosed. No pseudo aneurysms were present at the anastomosis sites on the follow up CTA.
Laparoscopic Excision of Leiomyoma of the Round Ligament of the Liver  [PDF]
Tianqi Zhang, Xueli Han, Xudong Wang, Shili Yu, Jianhua Liu, Bo Li
Advances in Computed Tomography (ACT) , 2017, DOI: 10.4236/act.2017.63003
Abstract: Leiomyoma of the round ligament of the liver is a very unusual tumor, and it shows nonspecific manifestations both in symptom and radiographic characterization. Herein, we report the case of leiomyoma which CT post-processing technique can directly exhibit the origin of the lesion. With radiological diagnosis, laparoscopic excision of the leiomyoma is carried out. Histopathology and immunohistochemical staining confirmed the leiomyoma of the round ligament. This case presents information to expand our knowledge focusing on the role of the CT post-processing technique before laparoscopic excision.
Historical Developments of BHR Humanoid Robots  [PDF]
Qiang Huang, Zhangguo Yu, Xuechao Chen, Weimin Zhang, Tianqi Yang, Wenxi Liao, Macro Ceccarelli
Advances in Historical Studies (AHS) , 2019, DOI: 10.4236/ahs.2019.81005
Abstract: Humanoid robots can achieve increasingly complex functions and adapt to more complex environments. To boost the development of humanoid robot technology, a team at Beijing Institute of Technology initiated the research on humanoid robots from 2000. Their research primarily focuses on stable walking, whole-body complex motion, human-robot interaction, and multimodal motion of humanoid robots. Thus far, the team has developed 6 generations of humanoid robots. The latest humanoid robot, BHR-6P, can achieve multi-mode motions (for example, walk, jump, fall protection, crawl and roll), which will significantly improve the ability of robot to adapt to the environment. This paper presented the historical evolution of BHR humanoid robots and outlined their functions and features.
Simulation of Water Pollution Diffusion Based on WebGIS  [PDF]
Tianqi Kuang, Jinglong Du, Weiwei Zhang
Journal of Computer and Communications (JCC) , 2019, DOI: 10.4236/jcc.2019.77004
Abstract:
Taking Liyang City of Jiangsu Province as the research object, a water pollution accident diffusion simulation and analysis system, taking WebGIS as the core, was established by taking finite difference method to do the system dynamics water quality model solution. This paper introduces the construction process of the model, the integration of the model with GIS, the interactive application of the system and users and the visual dynamic expression of water pollution accidents. By combining the statistical analysis of the spatial and environmental database in the system, the scientific simulation of the temporal and spatial relationship of the development of water pollution accidents on the client side is realized and providing precise decision support for early warning and control of water pollution diffusion.
TESTING STUDY ON THE DYNAMIC CHARACTERISTICS OF ORGANIC GLASS MODEL OF AN EARTHQUAKE ISOLATION FRAME
有机玻璃框架隔震模型的振动台试验研究

Song Tianqi,Zhang Yan,
宋天齐
,张严

岩石力学与工程学报 , 2000,
Abstract: The isolation of earthquake will eventually replace the resistance to earthquake. This seems to be an irreversible trend. However, almost all earthquake isolation devices share the same defects and disad vantages: inefficiency, high cost and difficulty in construction. To solve the problems, a new type of earthquake isolation(E I) device is developed, which has gained the patent right in China. The new E I device is entirely different from the conventional ones in terms of its manufacture, installation and service. The dynamic test of its organic glass model shows that 90 percent of seismic force can be isolated. In addition, its convenience in construction, low cost and no need of maintenance in service make it most suitable for the rigit frame structures in seismic regions.
Transient Charge and Energy Balance in Graphene Induced by Ultrafast Photoexcitation
Junhua Zhang,Joerg Schmalian,Tianqi Li,Jigang Wang
Physics , 2013, DOI: 10.1088/0953-8984/25/31/314201
Abstract: Ultrafast optical pump-probe spectroscopy measurement on monolayer graphene observes significant optical nonlinearities. We show that strongly photoexcited graphene monolayers with 35 fs pulses quasi-instantaneously build up a broadband, inverted Dirac fermion population. Optical gain emerges and directly manifests itself via a negative conductivity at the near-infrared region for the first 200fs, where stimulated emission completely compensates absorption loss in the graphene layer. To quantitatively investigate this transient, extremely dense photoexcited Dirac-fermion state, we construct a two-chemical-potential model, in addition to a time-dependent transient carrier temperature above lattice temperature, to describe the population inverted electronic state metastable on the time scale of tens of femtoseconds generated by a strong exciting pulse. The calculated transient optical conductivity reveals a complete bleaching of absorption, which sets the saturation density during the pulse propagation. Particularly, the model calculation reproduces the negative optical conductivity at lower frequencies in the states close to saturation, corroborating the observed femtosecond stimulated emission and optical gain in the wide near-infrared window.
Post-transient relaxation in graphene after an intense laser pulse
Junhua Zhang,Tianqi Li,Jigang Wang,Joerg Schmalian
Physics , 2013, DOI: 10.1140/epjst/e2013-01920-2
Abstract: High intensity laser pulses were recently shown to induce a population inverted transient state in graphene [T. Li et al. Phys. Rev. Lett. 108, 167401 (2012)]. Using a combination of hydrodynamic arguments and a kinetic theory we determine the post-transient state relaxation of hot, dense, population inverted electrons towards equilibrium. The cooling rate and charge-imbalance relaxation rate are determined from the Boltzmann-equation including electron-phonon scattering. We show that the relaxation of the population inversion, driven by inter-band scattering processes, is much slower than the relaxation of the electron temperature, which is determined by intra-band scattering processes. This insight may be of relevance for the application of graphene as an optical gain medium.
Feature-Based Matrix Factorization
Tianqi Chen,Zhao Zheng,Qiuxia Lu,Weinan Zhang,Yong Yu
Computer Science , 2011,
Abstract: Recommender system has been more and more popular and widely used in many applications recently. The increasing information available, not only in quantities but also in types, leads to a big challenge for recommender system that how to leverage these rich information to get a better performance. Most traditional approaches try to design a specific model for each scenario, which demands great efforts in developing and modifying models. In this technical report, we describe our implementation of feature-based matrix factorization. This model is an abstract of many variants of matrix factorization models, and new types of information can be utilized by simply defining new features, without modifying any lines of code. Using the toolkit, we built the best single model reported on track 1 of KDDCup'11.
An Improved Storage Structure Format for VCF Standard  [PDF]
Qi Cao, H. J. Cai, Tianqi Cai
Journal of Software Engineering and Applications (JSEA) , 2013, DOI: 10.4236/jsea.2013.611070
Abstract:

The Visiting Card Format (VCF) has already been widely used in mobile devices and personal computers (PC). Many mobile manufacturers have developed visiting card recognition systems by using Optical Character Recognition (OCR) technology, which can convert and save the information on the paper cards. However, the inaccuracy of OCR always leads to error in recognition, and it only seizes text information, ignoring images. Our research is to solve that problem based on the vCard format by creating a new VCF, vCardPackage, which contains both textual and pictorial information. It consists of a layout layer, a text content layer, a resource layer and a template layer. The design combines content, layout and images together, and enables users to view or modify mobile devices. The XML storage structure is adopted in the vCardPackage, which is compatible with VCF data, so that the original data can be stored completely when shared or transferred.

MXNet: A Flexible and Efficient Machine Learning Library for Heterogeneous Distributed Systems
Tianqi Chen,Mu Li,Yutian Li,Min Lin,Naiyan Wang,Minjie Wang,Tianjun Xiao,Bing Xu,Chiyuan Zhang,Zheng Zhang
Computer Science , 2015,
Abstract: MXNet is a multi-language machine learning (ML) library to ease the development of ML algorithms, especially for deep neural networks. Embedded in the host language, it blends declarative symbolic expression with imperative tensor computation. It offers auto differentiation to derive gradients. MXNet is computation and memory efficient and runs on various heterogeneous systems, ranging from mobile devices to distributed GPU clusters. This paper describes both the API design and the system implementation of MXNet, and explains how embedding of both symbolic expression and tensor operation is handled in a unified fashion. Our preliminary experiments reveal promising results on large scale deep neural network applications using multiple GPU machines.
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