检索结果-内蒙古大学图书馆

SSRN 2024年

作者： Li, Yongzhe Fu, Wenkai Meng, Lingyi Wang, Xiaoyu Liu, Xiaochao Zhang, Guangjun Zhou, Yijun School of Mechanical Engineering Southeast University Dongnandaxue Road No.2 Jiangning district Nanjing211189 China State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology China

This paper proposes a novel calibration method for calculating the spatial correlation of RWFs by registering readings of multiple robot-carried 3D sensors. After formulating the influence of both translational and rotational errors on the forming quality of deposits according to WAAM requirements, details about the principles and implementation of the method are presented. To deal with the heterogeneity of cross-source point cloud models, an improved iterative closest point (I-ICP) algorithm is articulated to enhance the accuracy of registration. The effectiveness of the method is validated by applying it to a dedicated case study. The results show that the proposed method can achieve high accuracy in orientation consistency of RWFs with an error of 0.091 deg, which is superior to the current state-of-the-art. This method can alleviate the consequences caused by the inconformity of multi-robot frames, such as low accuracy of part formation and surface unevenness. © 2024, The Authors. All rights reserved.

关键词： 3D printing

来源：评论

学校读者我要写书评

暂无评论

Small Disturbance Relationship with Internal-Voltage Amplitude/Frequency Excitation and Active/reactive Current Response and Its Linearization Method of AC Network for AC Power System Dynamic Analysis

Small Disturbance Relationship with Internal-Voltage Amplitu...

引用

Electrical engineering and Control Technologies (CEECT), Conference on

作者： Sicheng Wang Xiaoming Yuan State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665499002

With the high penetration of renewable generations, increasingly serious impact of dynamics of AC network as an important part of power systems on system dynamic behaviors urgently asks for constructing corresponding small disturbance linearization relationship of AC network to achieve dynamic analysis for today's new system by applying mature linear system mathematics. However, due to the existence of AC signals in the network, relevant DC state variables and operating points required for establishing and linearizing small disturbance relationship are not intuitive. But existing researches almost have not yet understood appropriate state variables and operating points from the perspective of AC power systems' basic operation principle and physical connotation of system dynamics, causing there is still a lack of a universal construction idea and a general linearization method of the small disturbance relationship of AC network suitable for system dynamic analysis. Thus, system operation principle and physical dynamics are first concerned by taking a simplified converter interfaced power system as an example in this paper, and internal-voltage amplitude/frequency (A/F) and active/reactive (A/R) current are revealed as state variables and operating points of AC power systems. A universal construction idea of small disturbance relationship with internal-voltage A/F excitation and A/R current response of AC network and relevant linearization method are then proposed. Finally, small disturbance linearization relationship of a typical inductive transmission line is established and is validated by simulation.

关键词： Linear systems Technological innovation Renewable energy sources Voltage fluctuations Power transmission lines System dynamics Systems operation

来源：评论

学校读者我要写书评

暂无评论

Foxtail millet supplementation improves glucose metabolism and gut microbiota in rats with high-fat diet/streptozotocin-induced diabetes

引用

Food Science and Human Wellness 2022年第1期11卷 119-128页

作者： Xin Ren Linxuan Wang Zenglong Chen Min Zhang Dianzhi Hou Yong Xue Xianmin Diao Ruihai Liu Qun Shen Beijing Advanced Innovation Center for Food Nutrition and Human Health Beijing Engineering and Technology Research Center of Food AdditivesBeijing Technology and Business UniversityBeijing 100048China Key Laboratory Plant Protein and Grain processing National Engineering and Technology Research Center for Fruits and VegetablesCollege of Food Science and Nutritional EngineeringChina Agricultural UniversityBeijing 100083China State Key Laboratory ofIntegrated Management of Pest Insects and Rodents Institute of ZoologyChinese Academy of SciencesBeijing 100101China Chinese Academy of Agricultural Sciences Beijing 100081China Institute of Comparative and Environmental Toxicology Department of Food ScienceCornell UniversityIthacaNYUnited States

Foxtail millet(FM)whole grain has received special attention in recent *** confirm the hypoglycemic effects of FM,we investigated the effects of FM supplementation on glucose metabolism and gut microbiota in rats with high-fat diet/streptozotocin(HFD/STZ)-induced ***,we fully assessed the blood biochemical profiles,pancreatic histopathology,insulin-glucagon immunofluorescence,short-chain fatty acids,and gut microbiota composition of rats with HFD/STZ-induced diabetes before and after FM *** showed that both 30% and 48% FM supplementation significantly decreased concentrations of fasting blood glucose,60-min blood glucose,and blood triglycerides(P<0.05);additionally,48% FM supplementation significantly improved blood glucose tolerance and insulin resistance(P<0.05).However,FM supplementation could not effectively repair damage to β-cells over a short period of *** addition,4 weeks of 48% FM supplementation siginificantly increased the relative abundance of Bifidobacterium and concentration of butyrate,suggesting that the hypoglycemic effects of FM supplementation might be partially mediated by gut ***,we found a dose-dependent relationship between FM supplementation and improvement of blood glucose metabolism,but did not find a synergistic effect between FM supplementation and metformin(Met)*** findings provide further support that consuming more whole-grain FM might be beneficial to individuals suffering from type 2 diabetes.

关键词： Foxtail millet Glucose metabolism Gut microbiota Short-chain fatty acids

来源：评论

学校读者我要写书评

暂无评论

Scalable and Versatile Linear Computation with Minimalistic Photonic Matrix Processor

arXiv

引用

arXiv 2024年

作者： Deng, Zhaoang Li, Zhenhua Liu, Jie Bian, Chuyao Li, Jiaqing Gan, Ranfeng Chen, Zihao Chen, Kaixuan Guo, Changjian Liu, Liu Yu, Siyuan State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information Technology Sun Yat-Sen University Guangzhou510006 China Guangdong Provincial Key Laboratory of Optical Information Materials and Technology South China Academy of Advanced Optoelectronics South China Normal University Guangzhou510006 China State Key Laboratory of Extreme Photonics and Instrumentation College of Optical Science and Engineering International Research Center for Advanced Photonics Zhejiang University Hangzhou310058 China

The advancement of artificial intelligence demands flexible multimodal data processing with high throughput and energy efficiency. Photonic integrated circuits (PIC) has demonstrated promising potentials in terms of low latency and low power consumption per operation for linear operations such as matrix-vector multiplication. However, the existing schemes face challenges in their scalability due to the use of photonic circuits that expand with the scale of the operants, despite efforts of exploiting the multiple optical parameter dimensions such as time, wavelength and spatial parallelism. They also lacked flexibility and efficiency in switching between different types of operations or tasks and adapting to multimodal data. In this article, we introduce an optical matrix processor (MP) with a minimalistic recursive structure for both multiplications and accumulations. The MP consists of an eletro-optic ring-modulator implemented as a thin-film lithium niobate PIC that allows flexible configurability and time-division multiplexed scheduling. The MP supports not only versatile linear operations including vector/matrix-vector multiplication and single/multi-kernel convolution but also ultra-fast task switching and adaptability to data of different sizes, by simply adjusting the data baud rate relative to the ring delay without structural modifications. We demonstrate its capabilities in a optic-electronic convolutional neural network with a computing throughput up to 73.4 billion operations per second. The MP further supports high scalability through appropriate allocation of wavelength and space resources, extending computing parallelism to handle higher data volumes with higher energy efficiency. This novel scheme paves the way for a new class of photonic processors capable of managing escalating data workloads with unprecedented flexibility, efficiency and scalability. Copyright © 2024, The Authors. All rights reserved.

关键词： Scalability

来源：评论

学校读者我要写书评

暂无评论

On Interlaminar Fracture of Tensile-Compressive Asymmetry Plain Weave Cfrp: Accurate Calibration and Simulation with Cohesive Zone Models

SSRN

引用

SSRN 2024年

作者： Sun, Guangyong Luo, Junjie Luo, Quantian Li, Qing State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle Hunan University Changsha410082 China School of Aerospace Mechanical and Mechatronic Engineering The University of Sydney SydneyNSW2006 Australia

Interlaminar fracture is a crucial factor influencing the structural integrity of plain weave carbon fiber reinforced polymer (PW-CFRP) composites, which is often modeled by cohesive zone models (CZM). While laminar tensile-compressive asymmetry (TC-A) in PW-CFRP is widely accepted, its effect has not been well considered in the modeling of interlaminar fracture using CZM. In this study, double cantilever beam (DCB) for mode I, end-notched flexure (ENF) for mode II, and single leg bending (SLB) for mixed-mode I+II tests were conducted on PW-CFRP. The interlaminar R-curve was calibrated using commonly-used analytical approaches. Since mixed-mode ratio (MMR) varied during damage evolution of mixed-mode in CZM, contrary to a constant MMR assumed in linear elastic fracture mechanics (LEFM), a high-fidelity finite element method (HiFEM) based on TC-A model was developed in this study to account for the MMR at local crack tip in CZM. Experimental and numerical results unveiled that the TC-A model significantly improved the prediction accuracy of stiffness and delamination process in DCB, ENF and SLB tests as compared to the conventional tensile-compressive symmetric (TC-S) model. Furthermore, adoption of R-curves rather than constant fracture toughness has proven essential for capturing the peak force and nonlinear responses in DCB, ENF, and SLB. The validity of HiFEM was demonstrated in accurately decoupling the mixed-mode energy release rates (ERRs) with different interlaminar strengths and stiffnesses, thus correcting the energy dissipation in CZM and enabling to accurately model the mixed-mode delamination. This study provides a reliable approach for better modeling interlaminar fracture effectively. © 2024, The Authors. All rights reserved.

关键词： Crack tips

来源：评论

学校读者我要写书评

暂无评论

Composition, Microstructure, and Mechanical Properties Evolution Behavior of Ta/Tahfc2 Laminated Composite between 1873~2673 K

SSRN

引用

SSRN 2023年

作者： Xiao, Peng Dai, Hongliang Li, Zhijian Yu, Yiping Wang, Song State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha410082 China Science and Technology on Advanced Ceramic Fibers and Composites Laboratory College of Aerospace Science and Engineering National University of Defense Technology Changsha410073 China

Ta/TaHfC2 laminated composite shows great potential for application in extreme thermal environments. However, the evolution behavior of the composite at high temperatures is still unknown, as such, it is hard to evaluate whether Ta/TaHfC2 can serve as a structural material stably. Here, we investigated the changes in composition, microstructure, and fracture mode of Ta/TaHfC2 before and after annealing at 1873 ~ 2673 K using XRD and SEM. Results show that the interfacial reaction and grain coarsening go on inside the composite at high temperatures, making its main phases change from Ta & TaHfC2 to Ta2C & TaHfC2, Ta4C3 &TaHfC2, and TaC & TaHfC2 in turn and the porosity gradually increased. The flexural strength of Ta/TaHfC2 decreased at high temperatures but it owns a high strength value of 314 ± 32 MPa with a retention rate is 86% after annealing at 2473 K for 10 min. © 2023, The Authors. All rights reserved.

关键词： Laminated composites

来源：评论

学校读者我要写书评

暂无评论

Partial Discharge Measurement of Power Module Packaging Insulation under Square Wave with Short Transition Time Based on SHF-Down-Mixing Method 3

Partial Discharge Measurement of Power Module Packaging Insu...

引用

3rd International Conference on Electrical Materials and Power Equipment, ICEMPE 2021

作者： Ding, Yi Wang, Yalin Zhou, Mingyu Sun, Hao Li, Wenyi Yin, Yi Shanghai Jiao Tong University Department of Electrical Engineering Shanghai China Power Transmission Technology State Key Laboratory of Advanced Beijing China

ISBN: (纸本)9781665418409

Exploring the partial discharge (PD) characteristics of power modules under square wave high electric fields with short rise and fall time is of great significance for improving the reliability of its packaging insulation. In this paper, a PD detection method based on super high frequency (SHF, 3-30 GHz) technique and signal down-mixing principle is applied to detect the PD under square wave. The power module packaging insulation specimen consisting of metal baseplate, direct bonding copper (DBC), substrate and housing is fabricated. A repetitive square wave generator is built to supply high voltage square waves with short transition time. PD experiments are performed under square wave and sinusoidal wave. Experimental results show that the SHF-down-mixing PD detection system can effectively suppress the electromagnetic interference (EMI) from the square wave and extract PD signals successfully. As the radius of the electrode corner increases, the partial discharge inception voltage (PDIV) values under the sinusoidal wave also gradually increases. The PDIV under square wave does not show a monotonically increasing and is usually higher than that under sinusoidal wave probably because of the effect of space charge accumulation. © 2021 IEEE.

关键词： Partial discharges

来源：评论

学校读者我要写书评

暂无评论

ID-Guard: A Universal Framework for Combating Facial Manipulation via Breaking Identification

arXiv

引用

arXiv 2024年

作者： Qu, Zuomin Lu, Wei Luo, Xiangyang Wang, Qian Cao, Xiaochun The School of Computer Science and Engineering Guangdong Province Key Laboratory of Information Security Technology Ministry of Education Key Laboratory of Machine Intelligence and Advanced Computing Institute of Artificial Intelligence Sun Yat-sen University Guangzhou510006 China The State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou450002 China The School of Cyber Science and Engineering Wuhan University Wuhan430072 China The School of Cyber Science and Technology Shenzhen Campus Sun Yat-sen University Shenzhen518107 China

—The misuse of deep learning-based facial manipulation poses a potential threat to civil rights. To prevent this fraud at its source, proactive defense technology was proposed to disrupt the manipulation process by adding invisible adversarial perturbations into images, making the forged output unconvincing to the observer. However, their non-directional disruption of the output may result in the retention of identity information of the person in the image, leading to stigmatization of the individual. In this paper, we propose a novel universal framework for combating facial manipulation, called ID-Guard. Specifically, this framework requires only a single forward pass of an encoder-decoder network to generate a cross-model universal adversarial perturbation corresponding to a specific facial image. To ensure anonymity in manipulated facial images, a novel Identity Destruction Module (IDM) is introduced to destroy the identifiable information in forged faces targetedly. Additionally, we optimize the perturbations produced by considering the disruption towards different facial manipulations as a multitask learning problem and design a dynamic weights strategy to improve cross-model performance. The proposed framework reports impressive results in defending against multiple widely used facial manipulations, effectively distorting the identifiable regions in the manipulated facial images. In addition, our experiments reveal the ID-Guard’s ability to enable disrupted images to avoid face inpaintings and open-source image recognition systems. Copyright © 2024, The Authors. All rights reserved.

关键词： Adversarial machine learning

来源：评论

学校读者我要写书评

暂无评论

Hydrogen Trapping and Embrittlement in a Second-Generation Ni-Based Single Crystal Superalloy

SSRN

引用

SSRN 2024年

作者： Lu, Guangxian Zhao, Yunsong Zhao, Tingting Chen, Yanhui Wang, William Yi Wen, Zhixun State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment School of Mechanics Civil Engineering and Architecture Northwestern Polytechnical University Xi′an710072 China National Key Laboratory of Science and Technology on Advanced High Temperature Structural Material Beijing Institute of Aeronautical Materials Beijing100095 China State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'An710072 China Institute of Microstructure and Property of Advanced Materials Beijing University of Technology Beijing100124 China

This study explores the hydrogen trapping capability and hydrogen embrittlement (HE) of a second-generation single crystal (SX) superalloy. Embrittlement susceptibility is greater as the duration of hydrogen charging is extended. The presence of hydrogen induces cleavage, micro-crack formation and denser slip traces. Moreover, hydrogen facilitates the formation of nano-voids and the activation of high-density dislocations, leading to denser slip bands which serve as initiation sites for micro-cracks. In addition, hydrogen is soluble in the γ matrix and is reversibly trapped at the γ/γ' interface. First-principles calculations have indicated that hydrogen reduces the binding strength at the γ/γ' interface, which promotes the propagation of micro-cracks. © 2024, The Authors. All rights reserved.

关键词： Hydrogen

来源：评论

学校读者我要写书评

暂无评论

Modulating vectored non-covalent interactions for layered assembly with engineerable properties

引用

Bio-Design and Manufacturing 2022年第3期5卷 529-539页

作者： Jiahao Zhang Sarah Guerin Haoran Wu Bin Xue Yi Cao Syed A.M.Tofail Yancheng Wang Damien Thompson Wei Wang Kai Tao Deqing Mei Ehud Gazit State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China Future Science Research Institute Hangzhou Global Scientific and Technological Innovation CenterZhejiang UniversityHangzhou 311200China Department of Physics and Bernal Institute University of LimerickCastletroyCo.LimerickLimerick V94T9PXIreland National Laboratory of Solid State Microstructure Department of PhysicsNanjing UniversityNanjing 210093China Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China School of Molecular Cell Biology and Biotechnology George S.Wise Faculty of Life SciencesTel Aviv University6997801 Tel AvivIsrael Department of Materials Science and Engineering Iby and Aladar Fleischman Faculty of EngineeringTel Aviv University6997801 Tel AvivIsrael

Vectored non-covalent interactions—mainly hydrogen bonding and aromatic interactions—extensively contribute to(bio)-organic self-assembling processes and significantly impact the physicochemical properties of the associated ***,vectored non-covalent interaction-driven assembly occursmainly along one-dimensional(1D)or three-dimensional(3D)directions,and a two-dimensional(2D)orientation,especially that of multilayered,graphene-like assembly,has been reported *** this present research,by introducing amino,hydroxyl,and phenyl moieties to the triazine skeleton,supramolecular layered assembly is achieved by vectored non-covalent *** planar hydrogen bonding network results in high stability,with a thermal sustainability of up to about 330°C and a Young’s modulus of up to about 40 *** introducing wrinkles by biased hydrogen bonding or aromatic interactions to disturb the planar organization,the stability ***,the intertwined aromatic interactions prompt a red edge excitation shift effect inside the assemblies,inducing broad-spectrum fluorescence covering nearly the entire visible light region(400–650 nm).We show that bionic,superhydrophobic,pillar-like arrays with contact angles of up to about 170°can be engineered by aromatic interactions using a physical vapor deposition approach,which cannot be realized through hydrogen *** findings show the feasibility of 2D assembly with engineerable properties by modulating vectored non-covalent interactions.

关键词： Vectored non-covalent interactions Layered assembly Supramolecular graphene Engineerable properties Physical vapor deposition

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：