检索结果-南通市图书馆

Verticality Detection Algorithm Based on Local Image Sharpness Criterion

Chinese Journal of Mechanical Engineering 2012年第1期25卷 173-178页

作者： ZHANG Jin wang zhong YE Shenghua YANG Chun LI Lin State Key Laboratory of Precision Measuring Technology and Instruments Tianjin UniversityTianjin 300072China

In the high precision image measurement system, the verticality error between the axis of the shooting system and the measured object can bring error of the measurement result. The high demand of the system’s vertical degree is raised by measure system due to the demands of high precision and disposable full field imaging in the micro-parts imaging measurement. The existing method of optical axis verticality detection cannot meet the demand all. In order to achieve the high-precision adjustment of the system optical axis, the algorithm of detecting verticality based on regional image definition is proposed. First, the objected standard image is divided into fixed area. Then, the object plane is moved from the downside to the upside of the focus plane, meanwhile, recording the definition function values of each standard image region at each step, and fitting out the clearest positions of the regions. Finally, according to the inter-regional relations between the locations and the height difference of the each regional clearest position, the small angle between the optical axis and the measured surface can be calculated. The experiment is based on the given image of lithography template with the scale of 10 μm as move unit, and the results show that this method effective reduced the small angle between the system optical axis and the measured body in high-precision image measuring system, the evaluation accuracy is less than 0.1°, meeting the requirements in high-precision measurement. The proposed method of detecting verticality based on regional image definition can evaluate the verticality error between the axis of the shooting system and the measured object accurately, effectively and conveniently.

关键词： verticality detection image definition optical axis adjustment

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Guaranteed Cost Consensus for High-dimensional Multi-agent Systems With Time-varying Delays

引用

IEEE/CAA Journal of Automatica Sinica 2018年第1期5卷 181-189页

作者： zhong wang Ming He Tang Zheng Zhiliang Fan Guangbin Liu High-Tech Institute of Xi'an Xi'an 710025 China

Guaranteed cost consensus analysis and design problems for high-dimensional multi-agent systems with time varying delays are investigated. The idea of guaranteed cost con trol is introduced into consensus problems for high-dimensiona multi-agent systems with time-varying delays, where a cos function is defined based on state errors among neighboring agents and control inputs of all the agents. By the state space decomposition approach and the linear matrix inequality(LMI)sufficient conditions for guaranteed cost consensus and consensu alization are given. Moreover, a guaranteed cost upper bound o the cost function is determined. It should be mentioned that these LMI criteria are dependent on the change rate of time delays and the maximum time delay, the guaranteed cost upper bound is only dependent on the maximum time delay but independen of the Laplacian matrix. Finally, numerical simulations are given to demonstrate theoretical results.

关键词： Guaranteed cost consensus high-dimensional multi-agent system time-varying delay

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

X-Ray and Radio Studies of the Candidate Millisecond Pulsar Binary 4FGL J0935.3+0901

引用

Research in Astronomy and Astrophysics 2022年第2期22卷 128-134页

作者： Dong Zheng zhong-Xiang wang Yi Xing Jithesh Vadakkumthani Department of Astronomy School of Physics and AstronomyYunnan UniversityKunming 650091China Key Laboratory of Astroparticle Physics of Yunnan Province Yunnan UniversityKunming 650091China Shanghai Astronomical Observatory Chinese Academy of Sciences80 Nandan RoadShanghai 200030China Inter-University Centre for Astronomy and Astrophysics PB No.4GaneshkhindPune-411007India Department of Physics University of CalicutMalappuram-673635KeralaIndia

4 FGL J0935.5+0901, a γ-ray source recently identified as a candidate redback-type millisecond pulsar(MSP)binary, shows an interesting feature of having double-peaked emission lines in its optical spectrum. This feature would further suggest the source is a transitional MSP system in the sub-luminous disk state. We have observed the source with XMM-Newton and Five-hundred-meter Aperture Spherical radio Telescope(FAST) at X-ray and radio frequencies respectively for further studies. From the X-ray observation, a bimodal count-rate distribution, which is a distinctive feature of the transitional MSP systems, is not detected, but the properties of X-ray variability and power-law spectrum are determined for the source. These results help establish the consistency of it being a redback in the radio pulsar state. However no radio pulsation signals are found in the FAST observation, resulting in an upper limit on the flux density of ~4 μJy. Implications of these results are discussed.

关键词： (stars:)binaries(including multiple):close (stars:)pulsars:general gamma-rays:stars

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Fermi Blazars in the Zwicky Transient Facility Survey:Properties of Large Optical Variations

引用

Research in Astronomy and Astrophysics 2024年第10期24卷 104-115页

作者： Si-Si Sun zhong-Xiang wang Shun-Hao Ji Department of Astronomy School of Physics and AstronomyYunnan UniversityKunming 650091China Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China

We analyze the optical light curve data,obtained with the Zwicky Transient Facility(ZTF)survey,for 47 γ-ray blazars monitored by the Large Area Telescope onboard the Fermi Gamma-ray Space Telescope(Fermi).These 47sources are selected because they are among the Fermi blazars with the largest optical variations in the ZTF *** color-magnitude variation patterns are seen in them,with one being redder-to-stable-when-brighter(RSWB;in 31 sources)and the other being stable when brighter(in 16 sources).The patterns fit with the results recently reported in several similar studies with different ***,we find that the colors in the stable state of the sources share similar values,for which(after being corrected for the Galactic extinction)most sources are in a range of 0.4–*** feature could be intrinsic and may be applied in,for example,study of the intragalactic *** also determine the turning points for the sources showing the RSWB pattern,after which the color changes saturate and become *** find a correlation between optical fluxes and γ-ray fluxes at the turning *** physical implications of the correlation remain to be investigated,probably better with a sample of high-qualityγ-ray flux measurements.

关键词： (galaxies:)BL Lacertae objects:general (galaxies:)quasars:general gamma-rays:galaxies

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Density Oscillation Induced by an Interface

引用

Chinese Physics Letters 1997年第11期14卷 869-872页

作者： wang Shao-feng wang zhong-cheng ZOU Shi-chang State Key Laboratory of Functional Materials for Informatics Shanghai Institute of MetallurgyChinese Academy of SciencesShanghai 200050

An asymptotic expression for the density oscillation induced by an interface has been derived analytically by using a method which is equivalent to stationary phase *** effects of the geometric structure of the Fermi surface and reflected amplitude are shown *** results provide a model-independent interpretation for some common features observed recently in the magnetic multilayer experiments.

关键词： approximation. stationary asymptotic

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Transfer Matrix for Multilayer Structure

引用

Chinese Physics Letters 1997年第10期14卷 782-785页

作者： wang Shao-feng wang zhong-cheng ZOU Shi-chang State Key Laboratory of Functional Materials for Informatics Shanghai Institute of MetallurgyShanghai 200050

A transfer matrix which transfers the electron states from one side of the interface to the other is defined for crystalline multilayer with layers joined *** total transfer matrix for several sequential interfaces can be simply obtained by multiplication of the *** bound states as well as the extended states can be naturally described in terms of transfer *** an illustration of using transfer matrix,the equation of quantum well states for sandwich structure have been given in this way.

关键词： illustration sandwich simply

来源：

维普期刊数据库评论

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-voltage output triboelectric nanogenerator with DC/AC optimal combination method

引用

Nano Research 2022年第4期15卷 3239-3245页

作者： Yuqi wang Tian Huang Qi Gao Jianping Li Jianming Wen zhong Lin wang Tinghai Cheng Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China School of Mechatronic Engineering Changchun University of TechnologyChangchun 130012China The Institute of Precision Machinery and Smart Structure Key Laboratory of Intelligent Operation and Maintenance Technology&Equipment for Urban Rail Transit of Zhejiang ProvinceCollege of EngineeringZhejiang Normal UniversityJinhua 321004China CUSTech Institute of Technology Wenzhou 325024China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGA 30332-0245USA

The high-voltage power source is one of the important research directions of triboelectric nanogenerator(TENG).In this paper,a high-voltage output TENG(HVO-TENG)is proposed with direct current/alternating current(DC/AC)optimal combination method for wind energy *** the optimal design of a direct current generation unit(DCGU)and an alternating current generation unit(ACGU),the HVO-TENG can produce DC voltage of 21.5 kV and AC voltage of 200 V,*** HVOTENG can continuously illuminate more than 6,000 light emitting diodes(LEDs),which is enough to drive more possible applications of ***,this paper explored application experiments on *** experiments indicate that the high-voltage DC output is used for producing ozone,while the AC output can light up ultraviolet(UV)*** HVOTENG can increase the ozone concentration(C)in an airtight container to 3 parts per million(ppm)after 7 h and continuously light up UV *** these demonstrations verify that the HVO-TENG has important guiding significance for designing high performance TENG.

关键词： triboelectric nanogenerator high voltage direct current/alternating current(DC/AC)optimal combination wind energy harvesting

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Protective effects of pLNCX-SOD gene transfection on hepatocyte injury induced by obstructive jaundice in rats

引用

Hepatobiliary & Pancreatic Diseases International 2007年第2期6卷 194-198页

作者： Gong, Peng wang, zhong-Yu wang, Hong-Jiang Dalian Med Univ Dept Gen Surg First Affiliated Hosp Dalian 116011 Peoples R China

BACKGROUND: Hydrophobic bile acids lead to the generation of oxygen free radicals in mitochondria. Accordingly, this study is to investigate if gene delivery of superoxide dismutase (SOD) will reduce hepatocyte injury caused by experimental cholestasis. METHODS: The recombinant of pLNCX-SOD gene packaged with lipofection of AMINE was transfected into hepatocytes in vitro, which stably expressed the SOD gene. RESULTS: After transfection, hepatocytes enhanced the protective effect against injury to bile and the toxicity of serum in obstructive jaundice. The inhibition of bile at the concentration of 2% (v: v, bile: DMEM 1: 50) decreased obviously from (78.80 +/- 12.35)% to (43.35 +/- 9.69)% in 12 hours, from (82.55 +/- 11.27)% to (-26.64 +/- 7.66)% in 24 hours, and from (83.83 +/- 18.69)% to (-19.27 +/- 14.38)% in 48 hours, compared with that of the untransfected cells (P < 0.01). The inhibition of serum at the obstructive jaudice concentration of 2.5% was obviously decreased from (89.72 +/- 1.52)% to (14.68 +/- 14.33)% in 12 hours, from (92.2 +/- 11.27)% to (41.39 +/- 7.66)% in 24 hours, and from (94.25 +/- 8.96)% to (22.71 +/- 4.38)% in 48 hours (P < 0.01). CONCLUSION: Hepatocytes transfected with the pLNCX-SOD gene could obviously be resistant to the toxicity of bile and serum from rat with obstructive jaundice.

关键词： obstructive jaundice retrovirus superoxide dismutase hepatocyte

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Multi-parameter identification of gratings measurement by Experimental Ray Tracing

引用

Research in Astronomy and Astrophysics 2021年第11期21卷 119-126页

作者： Li-Si Chen zhong-Wen Hu Hai-Jiao Jiang Hui-Min Kang Chen-zhong wang National Astronomical Observatories/Nanjing Institute of Astronomical Optics&Technology Chinese Academy of SciencesNanjing 210042China CAS Key Laboratory of Astronomical Optics&Technology Nanjing Institute of Astronomical Optics&TechnologyNanjing 210042China University of Chinese Academy of Sciences Beijing 100049China

A simple method for measuring grating groove density as well as its position and orientation is proposed based on the idea of ERT(Experimental Ray Tracing).Conventional methods only measure grating groove density with accuracy limited by its rotary stage and *** method proposed in the paper utilizes linear guides which could be calibrated to much higher *** is applicable to gratings of arbitrary surface profile or mosaic of a group of various *** measurement error sources are simulated by the Monte Carlo method and the results show high accuracy capability of grating parameters identification.A verification testing is *** accuracy dependency on main configuration parameters is evaluated.A method to expand measurement range by double wavelength is also discussed.

关键词： grating groove density position orientation measurement range

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of moxibustion on mTOR-mediated autophagy in rotenone-induced Parkinson's disease model rats

引用

Neural Regeneration Research 2018年第1期13卷 112-118页

作者： Shu-ju wang Qi wang Jun Ma Pei-hao Yu zhong-ming wang Bin wang Hubei University of Chinese Medicine/Huhei Provincial Collaborative Innovation Center of Preventive Treatment by Acupuncture and Moxibustion Wuhan Hubei Province China

Defects in autophagy-mediated clearance of α-synuclein may be one of the key factors leading to progressive loss of dopaminergic neurons in the substantia nigra. Moxibustion therapy for Parkinson’s disease has been shown to have a positive effect, but the underlying mechanism remains unknown. Based on this, we explored whether moxibustion could protect dopaminergic neurons by promoting autophagy mediated by mammalian target of rapamycin （mTOR）, with subsequent elimination of α-syn. A Parkinson’s disease model was induced in rats by subcutaneous injection of rotenone at the back of their necks, and they received moxibustion at Zusanli （ST36）, Guanyuan （CV4）and Fengfu （GV16）, for 10 minutes at every point, once per day, for 14 consecutive days. Model rats without any treatment were used as a sham control. Compared with the Parkinson’s disease group, the moxibustion group showed significantly greater tyrosine hydroxylase immunoreactivity and expression of light chain 3-II protein in the substantia nigra, and their behavioral score, α-synuclein immunoreactivity,the expression of phosphorylated mTOR and phosphorylated ribosomal protein S6 kinase （p-p70S6K） in the substantia nigra were significantly lower. These results suggest that moxibustion can promote the autophagic clearance of α-syn and improve behavioral performance in Parkinson’s disease model rats. The protective mechanism may be associated with suppression of the mTOR/p70S6K pathway.

关键词： nerve regeneration neurodegeneration Parkinson's disease acupuncture moxibustion rotenone alpha-synuclein autophagy phosphorylated mammalian target of rapamycin kinase phosphorylated ribosomal protein S6 kinase light chain 3-II neural regeneration

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：