629 research outputs found
Wei xing ji he qiao na mi jie gou de he cheng yu biao mian deng li ji yuan te xing yan jiu
No full textRuan, Qifeng = 衛星及核殼納米結構的合成與表面等離激元特性研究 / 阮琦鋒.Thesis Ph.D. Chinese University of Hong Kong 2015.Includes bibliographical references.Abstracts also in Chinese.Title from PDF title page (viewed on 16, December, 2016).Ruan, Qifeng = Wei xing ji he qiao na mi jie gou de he cheng yu biao mian deng li ji yuan te xing yan jiu / Ruan Qifeng
Supplemental Material, Table_S1 - LGALS4 as a Prognostic Factor in Urothelial Carcinoma of Bladder Affects Cell Functions
No full textSupplemental Material, Table_S1 for LGALS4 as a Prognostic Factor in Urothelial Carcinoma of Bladder Affects Cell Functions by Yu Ding, Qifeng Cao, Chen Wang, Huangqi Duan and Haibo Shen in Technology in Cancer Research & Treatment</p
Fano deformation rigidity of rational homogeneous spaces of submaximal Picard numbers
No full text© 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.We study the question whether rational homogeneous spaces are rigid under Fano deformation. In other words, given any smooth connected family π: X→ Z of Fano manifolds, if one fiber is biholomorphic to a rational homogeneous space S, is π an S-fibration? The cases of Picard number one were answered by Hwang and Mok. The manifold F(1 , Q5) is the unique rational homogeneous space of Picard number one that is not rigid under Fano deformation, and a Fano degeneration of it is constructed by Pasquier and Perrin. For higher Picard number cases, one notices that the Picard number of a rational homogeneous space G/P satisfies ρ(G/ P) ≤ rank (G). Weber and Wiśniewski proved that the rational homogeneous spaces G/P with ρ(G/ P) = rank (G) (i.e. complete flag manifolds) are rigid under Fano deformation. In this paper, we show that the rational homogeneous spaces G/P with ρ(G/ P) = rank (G) - 1 are rigid under Fano deformation, provided that G is a simple algebraic group of type ADE, and G/P is not biholomorphic to F(1 , 2 , P3) or F(1 , 2 , Q6). We also show that F(1 , 2 , P3) has a unique Fano degeneration, which is explicitly constructed. Furthermore, the structure of possible Fano degenerations of F(1 , 2 , Q6) is also described explicitly. Our main result is obtained by applying the theory of Cartan connections and symbol algebras.11Nsciescopu
sj-docx-1-tam-10.1177_17588359231220506 – Supplemental material for Nomogram to predict the presence of PSMA-negative but FDG-positive lesion in castration-resistant prostate cancer: a multicenter cohort study
No full textSupplemental material, sj-docx-1-tam-10.1177_17588359231220506 for Nomogram to predict the presence of PSMA-negative but FDG-positive lesion in castration-resistant prostate cancer: a multicenter cohort study by Jian Pan, Tingwei Zhang, Shouzhen Chen, Ting Bu, Jinou Zhao, Xudong Ni, Benkang Shi, Hualei Gan, Yu Wei, Qifeng Wang, Beihe Wang, Junlong Wu, Shaoli Song, Feng Wang, Chang Liu, Dingwei Ye and Yao Zhu in Therapeutic Advances in Medical Oncology</p
Motion prediction and planning under interactive environments
No full textAutonomous systems evolve rapidly in daily life, from hard-programmed industrial robotic arms to intelligent household service robots, from low-level driving assistance to high-level fully self-driving. To accomplish complex tasks with a higher level of autonomy, the capabilities of efficiently planning actions and accurately reasoning futures is crucial. In this thesis, I present motion prediction and planning approaches under interactive scenarios. The first part refers to planning for robotic manipulation under physical interaction. For robustly grasping arbitrary objects, we propose to optimize fingertip surface and plan grasps by geometry matching, which improves grasp stability and robustness by maximizing grasp contact areas. The grasp planning method is further applied to enable unmanned aerial vehicles with the capability of making and stabilizing contacts with the environment, to reduce power consumption and extend the operation time while staying at heights. For efficiently sorting multiple objects, we employ Monte Carlo tree search with a learned policy as the planning framework, which is capable of reliably sorting large numbers of objects under complex multi-contact and modeling inaccuracies. Furthermore, to facilitate flexible and safe motion planning for autonomous driving under social interaction, the second part highlights motion prediction in dynamic driving scenarios. A planning-informed prediction method is introduced to tackle the multi-agent prediction task. By informing the prediction network with the controllable agent’s planning process, it achieves state-of-the-art prediction accuracy on highway datasets NGSIM and HighD. Towards accurate and feasible trajectory prediction under explicit constraints and imperfect tracking, we propose a novel prediction framework, which guarantees trajectory feasibility by exploiting a model-based planner to produce trajectories under constraints and enables accurate multimodal prediction by employing a learning-based evaluator to select trajectories. The framework shows superiority in prediction accuracy, feasibility, robustness under imperfect tracking, and achieves 1st place on the Argoverse Motion Forecasting Leaderboard.</p
Towards Intelligent Object Manipulation: Vision-Based Grasping, Pose Estimation, and Physical Property Identification
No full textThis thesis advances intelligent robotic manipulation by addressing key challenges in perceiving and interacting with objects in unstructured, dynamic environments. The work spans three interconnected areas: robust grasp pose detection, open-vocabulary object understanding, and physical property identification for non-rigid objects. First, we present a real-time, collision-free grasp detection pipeline for 6-DoF and 7-DoF grasping. By fusing multi-view depth data into a high-resolution Truncated Signed Distance Function volume, our system maintains accurate scene geometry. A novel volume-point network enables efficient grasp candidate evaluation, while a refinement module optimizes poses based on local geometry. This volumetric approach extends to 7-DoF grasping by incorporating reasoning about antipodal contact points, improving precision for complex object interactions. Second, we overcome limitations of traditional pose estimation methods constrained to known objects or categories. We introduce an open-vocabulary, category-level object pose and size estimation framework that leverages large-scale vision-language foundation models. This enables generalization to unseen object categories at test time using only free-form textual descriptions, enhancing flexibility for language-driven manipulation tasks. Third, we address the challenge of interacting with deformable objects by introducing the Gaussian-Informed Continuum (GIC) framework for physical property identification. This approach integrates dynamic 3D Gaussian reconstruction of deforming objects with Material Point Method continuum simulation. By aligning simulation results with observations, the framework estimates physical parameters of objects, enabling more realistic simulation and informed manipulation strategies for non-rigid materials. Extensive experiments on simulated and real benchmarks show our grasping pipeline operates in real-time and outperforms prior art in success rate; the open-vocabulary model achieves state-of-the-art accuracy on unseen categories; and GIC faithfully estimates physical properties, supporting digital-twin simulations. Collectively, these contributions equip robots with richer perceptual and physical reasoning capabilities, paving the way for more versatile, autonomous manipulation in everyday settings.</p
Competing Endogenous RNA Networks Underlying Anatomical and Physiological Characteristics of Poplar Wood in Acclimation to Low Nitrogen Availability
No full textGradient Domain Editing of Deforming Mesh Sequences
No full textFigure 1: A straight run is adapted to a curved path on an uneven terrain. The original deforming mesh sequence moves along a straight line on a plane. We first make the HORSE move along a curve using path editing, and then adapt the sequence onto the terrain using footprint editing. Many graphics applications, including computer games and 3D animated films, make heavy use of deforming mesh sequences. In this paper, we generalize gradient domain editing to deforming mesh sequences. Our framework is keyframe based. Given sparse and irregularly distributed constraints at unevenly spaced keyframes, our solution first adjusts the meshes at the keyframes to satisfy these constraints, and then smoothly propagate the constraints and deformations at keyframes to the whole sequence to generate new deforming mesh sequence. To achieve convenient keyframe editing, we have developed an efficient alternating least-squares method. It harnesses the power of subspace deformation and two-pass linear methods to achieve high-quality deformations. We have also developed an effective algorithm to define boundary conditions for all frames using handle trajectory editing. Our deforming mesh editing framework has been successfully applied to a number of editing scenarios with increasing complexity, including footprint editing, path editing, temporal filtering, handle-based deformation mixing, and spacetime morphing. † This work was done while Qifeng Tan was an intern at Microsoft Re-search Asia
AN INTRINSICALLY CONDUCTING POLYMER-BASED COATING SYSTEM FOR CORROSION PROTECTION OF STEELS
No full textAmong the various corrosion protection strategies for structural steels, coating techniques provide the most cost-effective protection and have been used as the primary mode for corrosion protection. Existing coating techniques have been used mainly for their barrier capability and all have a limited service life. In this research work, a waterborne two-strand polyaniline: poly (acrylic acid) complex was synthesized and utilized to fabricate the primer layer of a two-layer coating system. The techniques of Scanning Kelvin Probe Force Microscopy (SKPFM) and Electrochemical Impedance Spectroscopy (EIS) were used to evaluate the anti-corrosion capability of the polymeric complex when mixed in an epoxy matrix and coated on steel samples as the primer layer. The evaluation results show that coating systems including a PANi-based primer has measurable anticorrosion capability and the anti-corrosion capability of PANi-based primer depends on the usage of PANi and the type of matrix material of the primer layer. In the laboratory condition, a prototype two-layer coating system including the PANi-based primer and a polyurethane topcoat was manufactured. The ASTM Salt-Spray Test and EIS were used to prove the anti-corrosion performance of the prototype using a two-layer, polyurethane-over-epoxy system (no PANi) as the control system. After the proof of concept, a non-waterborne epoxy was used to fabricate a different PANi-based primer. The two types of primers and two other commercial primers (a zinc-rich primer and an epoxy-only primer) were used to make a total of eight two-layer coating systems using two widely used topcoats. Salt-Spray Test, Cyclic Salt Fog/UV Exposure Test, Pull- Off Adhesion Test, and the techniques of EIS, SKPFM, and Scanning Electron Microscope (SEM) were used to evaluate the long-term performance of the eight systems. Based on the laboratory-based recommendations, six groups of two-layer coating systems were then subjected to the outdoor-exposure test to evaluate their anti-corrosion durability at two testing sites. The field durability of the coating systems was evaluated in terms of their surface gloss reduction, color change, adhesion change and surface deteriorations. The matrix material in which the PANi is mixed plays an important role in the longterm anti-corrosion performance of coatings. The waterborne epoxy is effective in dispersing PANi nano-particles and has zero VOC; however, it does not bond to the steel surface as strongly as the regular non-waterborne epoxy. The topcoat material also plays an important role in the long-term anti-corrosion performance of coatings; polyurethane has higher durability than epoxy as a topcoat material. The PANi-based systems possess long-term corrosion protection comparable to the performance of the conventional zincrich three-layer system based on the one-year field evaluation.Ph.D. in Civil Engineering, December 201
Schur-convexity of the Extended Mean Values
No full textIn this article, the Schur-convexity of the extended mean values are proved. Consequently, an inequality between the logarithmic mean values and the identity (exponential) mean values is deduced
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