检索结果-南通市图书馆

Effect of Na^(+)and Sr^(2+)Substitution on the Formation of the Oxygen Vacancies in Y_(3)Al_(2)Ga_(3)O_(12):Ce^(3+)Phosphor

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2023年第5期38卷 1221-1230页

作者： YANG Ting jiang hongyi DONG Ye GAO Shuai LIU Shuning School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

The low-valence cations Na^(+)and Sr^(2+)were selected as the co-dopants to increase the vacancies concentration in the Y_(2.982)Ce_(0.018)Al_(2)Ga_(3)O_(12)phosphor.The successful incorporation of Na^(+)and Sr^(2+)was confirmed by the X-Ray Difiraction(XRD)results.All the samples show 5d-4f green persistent luminescence of Ce^(3+)after 450 nm excitation.The decay curves demonstrate that the persistent luminescence is efiectively enhanced with Na+and Sr2+doping.The thermoluminescence glow curves also show not only does the trap concentration increase,but also the distribution of trap depths is broadened.In addition,the air-and H_(2)/Ar-annealing treatments were conducted on every as-made sample.The experimental results prove that the increased traps after the Na^(+)/Sr^(2+)doping are mainly attributed to the oxygen vacancies,and the traps have a continuous and broad distribution of trap depths.We hope this work could give new inspiration for designing a high-performance persistent phosphor.

关键词： persistent luminescence YAGG Na^(+) Sr^(2+) oxygen vacancy charge compensation solidstate reaction

Ultra-lightweight ceramic scaffolds with simultaneous improvement of pore interconnectivity and mechanical strength

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第6期137卷 247-258页

作者： Ye Dong Annan Chen Ting Yang Shuai Gao Shuning Liu Hongyi Jiang Yusheng Shi Chenglong Hu School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Engineering Research Center of Ceramic Materials for Additive Manufacturing Ministry of EducationWuhan 430074China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

The high porosity and interconnectivity of scaffolds are critical for nutrient transmission in bone tis-sue engineering but usually lead to poor mechanical properties.Herein,a novel method that combines acid etching(AE)with selective laser sintering(SLS)and reaction bonding(RB)of Al particles is pro-posed to realize highly improved porosity,interconnectivity,mechanical strength,and in vitro bioactivity in 3D Al_(2)O_(3) scaffolds.By controlling the oxidation and etching behaviors of Al particles,a tunable hol-low spherical feature can be obtained,which brings about the distinction in compressive response and fracture path.The prevention of microcrack propagation on the in situ formed hollow spheres results in unique near elastic buckling rather than traditional brittle fracture,allowing an unparalleled compressive strength of 3.72±0.17 MPa at a high porosity of 87.7%±0.4%and pore interconnectivity of 94.7%±0.4%.Furthermore,scaffolds with an optimized pore structure and superhydrophilic surface show excellent cell proliferation and adhesion properties.Our findings offer a promising strategy for the coexistence of out-standing mechanical and biological properties,with great potential for tissue engineering applications.

关键词： Ceramic scaffolds Selective laser sintering Acid etching Hollow spherical feature Mechanical strength In vitro bioactivity

Multi-narrowband signals receiving method based on analog-to-information convertor and block sparsity

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2017年第4期28卷 643-653页

作者： hongyi Xu Haiqing jiang Chaozhu Zhang School of Information and Communication Engineering Harbin Engineering University School of Information and Electronic Engineering Beijing Institute of Technology

The analog-to-information convertor (AIC) is a successful practice of compressive sensing (CS) theory in the analog signal acquisition. This paper presents a multi-narrowband signals sampling and reconstruction model based on AIC and block sparsity. To overcome the practical problems, the block sparsity is divided into uniform block and non-uniform block situations, and the block restricted isometry property and sub-sampling limit in different situations are analyzed respectively in detail. Theoretical analysis proves that using the block sparsity in AIC can reduce the restricted isometric constant, increase the reconstruction probability and reduce the sub -sampling rate. Simulation results show that the proposed model can complete sub -sampling and reconstruction for multi-narrowband signals. This paper extends the application range of AIC from the finite information rate signal to the multi-narrowband signals by using the potential relevance of support sets. The proposed receiving model has low complexity and is easy to implement, which can promote the application of CS theory in the radar receiver to reduce the burden of analog-to digital convertor (ADC) and solve bandwidth limitations of ADC.

关键词： compressive sensing (CS) block sparsity analog-to-information convertor (AIC) multi-narrowband signals

Adaptive block greedy algorithms for receiving multi-narrowband signal in compressive sensing radar reconnaissance receiver

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2018年第6期29卷 1158-1169页

作者： ZHANG Chaozhu XU hongyi jiang Haiqing School of Information and Communication Engineering Harbin Engineering University School of Information and Electronics Beijing Institute of Technology

This paper extends the application of compressive sensing(CS) to the radar reconnaissance receiver for receiving the multi-narrowband signal. By combining the concept of the block sparsity, the self-adaption methods, the binary tree search,and the residual monitoring mechanism, two adaptive block greedy algorithms are proposed to achieve a high probability adaptive reconstruction. The use of the block sparsity can greatly improve the efficiency of the support selection and reduce the lower boundary of the sub-sampling rate. Furthermore, the addition of binary tree search and monitoring mechanism with two different supports self-adaption methods overcome the instability caused by the fixed block length while optimizing the recovery of the unknown signal.The simulations and analysis of the adaptive reconstruction ability and theoretical computational complexity are given. Also, we verify the feasibility and effectiveness of the two algorithms by the experiments of receiving multi-narrowband signals on an analogto-information converter(AIC). Finally, an optimum reconstruction characteristic of two algorithms is found to facilitate efficient reception in practical applications.

关键词： compressive sensing(CS) adaptive greedy algorithm block sparsity analog-to-information convertor(AIC) multinarrowband signal

从巴基斯坦“新民族”现象解读跨界民族身份认同

在线全文

学校读者我要写书评

暂无评论

国际展望 2023年第2期15卷 102-115,161页

作者：姜宏毅上海外国语大学国际关系与公共事务学院上海201620

巴基斯坦“新民族”的形成与阿富汗难民问题息息相关。随着阿富汗政局逐渐平稳,陆续有难民回归,但是仍有大量人员不愿意离开巴基斯坦。其主要是因为阿富汗的条件无法完全保证和平生活,以及缺乏经济机会。阿富汗难民在巴基斯坦生活了二... 详细信息

巴基斯坦“新民族”的形成与阿富汗难民问题息息相关。随着阿富汗政局逐渐平稳,陆续有难民回归,但是仍有大量人员不愿意离开巴基斯坦。其主要是因为阿富汗的条件无法完全保证和平生活,以及缺乏经济机会。阿富汗难民在巴基斯坦生活了二十多年,新一代的阿富汗人在一个全新的环境中长大,特别是在巴基斯坦出生和长大的孩子,他们认为自己更多的是巴基斯坦社会的一部分。巴基斯坦“新民族”逐渐形成。“新民族”的诞生也引发了其他许多社会问题,尤其是难民们对阿巴两国的国家以及民族身份认同等问题。跨界民族的身份认同问题十分敏感,极易引发跨国安全问题,是对中南亚地区安全的极大隐患,其唯一可行的解决之道,只能是国际社会各方共同努力,减少难民数量,帮助阿富汗尽快实现战后重建工作,维护好良性的国内生存环境,以此来实现难民的遣返,进而在最大程度上实现中南亚地区的和平与稳定。

关键词：普什图人新民族身份认同跨界民族中南亚地区

Macrocyclic peptides as regulators of protein-protein interactions

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2018年第7期29卷 1067-1073页

作者： Yang jiang hongyi Long Yujie Zhu Yi Zeng College of Pharmacy and Bioengineering Chengdu University School of Science Xihua University

Protein-protein interactions(PPIs) are recognized as attractive therapeutic targets. However targeting PPIs especially intracellular ones has been proven extremely difficult for conventional drug-like small molecules, and biological drugs such as monoclonal antibodies have difficulty in reaching intracellular targets. Macrocyclic peptides are promising candidates of PPI regulators for their potential in combining high potency and biological stability together. Cell permeability of macrocyclic peptides may also be achieved by structural modifications or conjugation to a cell-penetrating sequence. Significant progress has been made in this research area in recent years. Important technology progress and recent examples of macrocyclic peptide PPI modulators are reviewed.

关键词： Macrocycle Macrocyclic peptide Protein-protein interaction Inhibitor Cell-penetrating peptide

Big data and artificial intelligence discover novel drugs targeting proteins without 3D structure and overcome the undruggable targets

在线全文

学校读者我要写书评

暂无评论

Stroke & Vascular Neurology 2020年第4期5卷 381-387页

作者： Huiqin He Benquan Liu hongyi Luo Tingting Zhang Jingwei jiang jiangsu Key Lab of Drug Screening China Pharmaceutical UniversityNanjingChina Institute of Pharmacologic Science China Pharmaceutical UniversityNanjingChina

The discovery of targeted drugs heavily relies on three-dimensional(3D)structures of target proteins.When the 3D structure of a protein target is unknown,it is very difficult to design its corresponding targeted drugs.Although the 3D structures of some proteins(the so-called undruggable targets)are known,their targeted drugs are still absent.As increasing crystal/cryogenicelectron microscopy structures are deposited in Protein Data Bank,it is much more possible to discover the targeted drugs.Moreover,it is also highly probable to turn previous undruggable targets into druggable ones when we identify their hidden allosteric sites.In this review,we focus on the currently available advanced methods for the discovery of novel compounds targeting proteins without 3D structure and how to turn undruggable targets into druggable ones.

关键词： structure overcome drugs

A channel state information based virtual MAC spoofing detector

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

High-Confidence Computing

High-Confidence Computing 2022年第3期2卷 1-6页

作者： Peng jiang hongyi Wu Chunsheng Xin Department of ECE Old Dominion UniversityNorfolkVAUSA School of Cybersecurity Old Dominion UniversityNorfolkVAUSA

Physical layer security has attracted lots of attention with the expansion of wireless devices to the edge networks in recent years.Due to limited authentication mechanisms,MAC spoofing attack,also known as the identity attack,threatens wireless systems.In this paper,we study a new type of MAC spoofing attack,the virtual MAC spoofing attack,in a tight environment with strong spatial similarities,which can create multiple counterfeits entities powered by the virtualization technologies to interrupt regular services.We develop a system to effectively detect such virtual MAC spoofing attacks via the deep learning method as a countermeasure.A deep convolutional neural network is constructed to analyze signal level information extracted from Channel State Information(CSI)between the communication peers to provide additional authentication protection at the physical layer.A significant merit of the proposed detection system is that this system can distinguish two different devices even at the same location,which was not well addressed by the existing approaches.Our extensive experimental results demonstrate the effectiveness of the system with an average detection accuracy of 95%,even when devices are co-located.

关键词： Virtual Mac spoofing Channel state information Deep learning

Influence of Li2O Addition on the Performance of Vitrified Bond and Vitrified Diamond Composites

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2020年第4期35卷 699-705页

作者：郭兵健 jiang hongyi School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

In order to develop high-performance diamond wheels,the vitrified bond with different contents of Li2O addition and corresponding diamond composites were prepared.The experimental results show that the addition of a small content of Li2O leads the formation of the mullite phase in vitrified bond.When the Li2O content is 3wt%,the mullite content in the vitrified bond reaches the maximum.Whereas,the vitrified bond turns into a pure glass phase when the Li2O content further increases to 5wt%.The softening temperature of vitrified bond,wetting angle between the vitrified bond and the diamond film decrease with the increasing of the Li2O content.The softening point of the vitrified bond with 5wt% Li2O is 537 ℃ and the contact angle is 32°,which are 44 ℃ and 44° lower than those of the sample without Li2O.The CTE (coefficient of thermal expansion),the flexural strength and hardness of the diamond composite sample first increase and then decrease with the increasing of the Li2O content.When the Li2O addition is 3wt%,the flexural strength and hardness of the composites reaches the maximum values of 93 MPa and 98 HRB,respectively,which are 43.1% and 12.6% higher than those of the sample without Li2O.

关键词： Li2O addition performance vitrified bond vitrified diamond composite