检索结果-南通市图书馆

A New Grasping Mode Based on a Sucked-type Underactuated Hand

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2018年第6期31卷 25-33页

作者： Pei-Chen Wu nan lin Ting Lei Qian Cheng Jin-Ze Wu Xiao-Ping Chen School of Computer Science and Technology University of Science and Technology of China Hefei 230000 China

Robot hands have been developing during the last few decades. There are many mechanical structures and analyti?cal methods for di erent hands. But many tough problems still limit robot hands to apply in homelike environment. The ability of grasping objects covering a large range of sizes and various shapes is fundamental for a home service robot to serve people better. In this paper, a new grasping mode based on a novel sucked?type underactuated(STU) hand is proposed. By combining the flexibility of soft material and the e ect of suction cups, the STU hand can grasp objects with a wide range of sizes, shapes and materials. Moreover, the new grasping mode is suitable for some situations where the force closure is failure. In this paper, we deduce the e ective range of sizes of objects which our hand using the new grasping mode can grasp. Thanks to the new grasping mode, the ratio of grasping size between the biggest object and the smallest is beyond 40, which makes it possible for our robot hand to grasp diverse objects in our daily life. For example, the STU hand can grasp a soccer(220 mm diameter, 420 g) and a fountain pen(9 mm diameter, 9 g). What’s more, we use the rigid body equilibrium conditions to analysis the force condition. Experiment evaluates the high load capacity, stability of the new grasping mode and displays the versatility of the STU hand. The STU hand has a wide range of applications especially in unstructured environment.

关键词： Grasping mode Underactuated hand Sucked?type Stability of new mode Grasping diverse objects

Role of Multi-scale Hierarchical Structures in Regulating Wetting State and Wetting Properties of Structured Surfaces

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2024年第3期21卷 1347-1359页

作者： Yue Jiang Xinyi Li Zhichao Ma Zhihui Zhang Cuie Wen Zhonghao Jiang nan lin Luquan Ren Key Laboratory of Bionic Engineering of Ministry of Education College of Biological and Agricultural EngineeringJilin UniversityChangchun130022China Hubei Provincial Engineering Technology Research Center for Microgrid College of Electrical Engineering and New EnergyChina Three Gorges UniversityYichang443002China School of Mechanical and Aerospace Engineering Jilin UniversityChangchun130025China Centre for Additive Manufacturing School of EngineeringRMIT UniversityMelbourneVictoria3001Australia Key Laboratory of Automobile Materials of Ministry of Education College of Materials Science and EngineeringJilin UniversityChangchun130025China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry Jilin UniversityChangchun130012China

Amplifying the intrinsic wettability of substrate material by changing the solid/liquid contact area is considered to be the main mechanism for controlling the wettability of rough or structured *** theoretical analysis and experimental exploration,we have found that in addition to this wettability structure amplification effect,the surface structure also simultaneously controls surface wettability by regulating the wetting state via changing the threshold Young angles of the Cassie-Baxter and Wenzel wetting *** wetting state regulation effect provides us with an alternative strategy to overcome the inherent limitation in surface chemistry by tailoring surface *** wetting state regulation effect created by multi-scale hierarchical structures is quite significant and plays is a crucial role in promoting the superhydrophobicity,superhydrophilicity and the transition between these two extreme wetting properties,as well as stabilizing the Cassie-Baxter superhydrophobic state on the fabricated lotus-like hierarchically structured Cu surface and the natural lotus leaf.

关键词： Hierarchical structure Wetting state regulation Wetting transition Superhydrophobicity Superhydrophilicity

Magnetic resonance imaging for local complications of acute pancreatitis: A pictorial review

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

World Journal of Gastroenterology 2010年第22期16卷 2735-2742页

作者： Xiao, Bo Zhang, Xiao-Ming Tang, Wei Zeng, nan-lin Zhai, Zhao-Hua N Sichuan Med Coll Affiliated Hosp Dept Radiol Sichuan Key Lab Med Imaging Nanchong 637000 Sichuan Prov Peoples R China

Acute pancreatitis is a common disease characterized by sudden upper abdominal pain and vomiting. Alcoholism and choledocholithiasis are the most common factors for this disease. The choice of treatment for acute pancreatitis might be affected by local complications, such as local hemorrhage in or around the pancreas, and peripancreatic infection or pseudoaneurysm. Diagnostic imaging modalities for acute pancreatitis have a significant role in confirming the diagnosis of the disease, helping detect the extent of pancreatic necrosis, and for diagnosing local complications. Magnetic resonance imaging (MRI) might be indicated in acute pancreatitis for detecting and characterizing local complications of acute pancreatitis that involve necrotic, hemorrhagic, infectious, vascular, and pseudocyst disorders. The general MRI sequences for pancreatitis require the combined use of T1-weighted, T2-weighted sequences, and magnetic resonance chol-angiopancreatography. For imaging of pancreatic necrosis, the combination of T1-weighted and T2-weighted findings with dynamic contrast-enhanced imaging gives a comprehensive evaluation of the extent of necrosis and full range of inflammatory extension. For imaging of infectious complications, dynamic contrast-enhanced examinations might help differentiate pancreatic cellulitis or abscesses, from pancreatic fluid collection or simple pseudocysts. For vascular abnormalities, the combination of cross-sectional pancreatic parenchyma imaging with MRA represents a single diagnostic modality for the full evaluation of peripancreatic artery and vein involvement, such as arterial pseudoaneurysms and venous thromboses. The purpose of this pictorial review is to examine the MRI appearances of various local complications of acute pancreatitis and to discuss the practical setup of MRI in local complications of acute pancreatitis.

关键词： Pancreas Pancreatitis Complication Magnetic resonance imaging Pictorial review

Research on quantum well intermixing of 680 nm AlGaInP/GaInP semiconductor lasers induced by composited Si-Si_(3)N_(4) dielectric layer

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

Journal of Semiconductors 2022年第8期43卷 46-52页

作者： Tianjiang He Suping Liu Wei Li Cong Xiong nan lin Li Zhong Xiaoyu Ma National Engineering Research Center for Optoelectronic Devices Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China College of Materials Science and Optoelectronics University of Chinese Academy of SciencesBeijing 100049China

The optical catastrophic damage that usually occurs at the cavity surface of semiconductor lasers has become the main bottleneck affecting the improvement of laser output power and long-term *** improve the output power of 680 nm AlGaInP/GaInP quantum well red semiconductor lasers,Si-Si_(3)N_(4)composited dielectric layers are used to induce its quantum wells to be intermixed at the cavity surface to make a non-absorption *** with a thickness of 100 nm and Si_(3)N_(4)with a thickness of 100 nm were grown on the surface of the epitaxial wafer by magnetron sputtering and PECVD as diffusion source and driving source,*** with traditional Si impurity induced quantum well intermixing,this paper realizes the blue shift of 54.8 nm in the nonabsorbent window region at a lower annealing temperature of 600 ℃ and annealing time of 10 *** this annealing condition,the wavelength of the gain luminescence region basically does not shift to short wavelength,and the surface morphology of the whole epitaxial wafer remains fine after *** application of this process condition can reduce the difficulty of production and save cost,which provides an effective method for upcoming fabrication.

关键词： high power semiconductor laser rapid thermal annealing composited dielectric layer quantum well intermixing optical catastrophic damage nonabsorbent window

Sedimentological and microfossil records of modern typhoons in a coastal sandy lagoon off southern China coast

在线全文

学校读者我要写书评

暂无评论

Journal of Palaeogeography 2021年第4期10卷 529-549页

作者： Hong-Shuai Qi Min Chen lin-nan Shen Feng Cai Ai-Mei Zhang Qi Fang Third Institute of Oceanography Ministry of Natural ResourcesXiamen 361005Fujian ProvinceChina Southern Marine Science and Engineering Guangdong Laboratory Zhuhai 519082Guangdong ProvinceChina Observation and Research Station of Coastal Wetland Ecosystem in Beibu Bay Ministry of Natural ResourcesBeihai 536015Guangxi ProvinceChina Xiamen Municipal Bureau of Land Resources and Housing AdministrationXiamen 361013Fujian ProvinceChina

To determine the characteristics and potential indicators of modern typhoon deposition in a sandy lagoon off the coast of Guangdong Province(southern China),we analysed the ^(210)Pb,sedimentology,and microfossils of samples from ten cores obtained before and after the passage of Typhoon Rammasun in *** deposition showed a thinning trend from internal areas of the lagoon to its mouth,with the maximum thickness inside the lagoon of~35 *** typhoon deposits are dominated by overwash and differ from sediments deposited under normal weather *** normal weather conditions,lagoon sediment has a210 Pb curve that follows a model of exponential decay,has a unimodal granularity frequency curve,and lacks organic matter and microfossils(diatoms and foraminifera).However,210 Pb is low in the typhoon deposits,the grain size is coarse,and the granularity frequency curve is obviously *** are also abundant foraminifera in the typhoon *** found a clear double-layered structure in the typhoon deposits,which was caused by strong hydrodynamic disturbance that mixed sediments originally from the offshore area with those of the *** lower layer has coarse-grained particles with medium sorting,low organic matter content,and low diatom *** upper layer has fine-grained particles with poor sorting,high organic matter content,and abundant *** rate of fragmentation of diatoms in the upper layer was very high(40%-60%).The diatom assemblage contained offshore and freshwater species carried by storm ***,we believe that the sediments of this typical sand bar-lagoon environment retain evidence of typhoon events along the southern China coast that is displayed in the marked sedimentological and microfossil characteristics.

关键词： Sediment record Microfossils Typhoon Rammasun Lagoon Southern China coast

Modeling and Verification of a Sentiment Analysis System Using Aspect-Oriented Petri Nets

在线全文

学校读者我要写书评

暂无评论

Journal of Electronic Science and Technology 2022年第2期20卷 209-223页

作者： Shu-Hung Yang Yi-nan lin Cheng-Ying Yang Ming-Kuen Chen Victor R.L.Shen Yu-Wei lin the Department of Business Management National Taipei University of TechnologyTaipei 10608 the Department of Computer Science University of TaipeiTaipei 100 the Department of Information Management Chaoyang University of TechnologyTaichung 413 the Department of Computer Science and Information Engineering National Taipei UniversityNew Taipei 23741

An increasing number of social media and networking platforms have been widely used. People usually post the online comments to share their own opinions on the networking platforms with social media. Business companies are increasingly seeking effective ways to mine what people think and feel regarding their products and services. How to correctly understand the online customers’ reviews becomes an important issue. This study aims to propose a method with the aspect-oriented Petri nets(AOPN) to improve the examination correctness without changing any process and program. We collect those comments from the online reviews with Scrapy tools, perform sentiment analysis using SnowNLP, and examine the analysis results to improve the correctness. In this paper, we apply our method for a case of the online movie comments. The experimental results have shown that AOPN is helpful for the sentiment analysis and verifying its correctness.

关键词： own correctness companies

Temperature-Induced Plasma Frequency Shift in Bi_(2)Te_(3) and Cu_(x)Bi_(2)Se_(3)

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2013年第12期30卷 152-156页

作者： DONG Tao YUAN Rui-Hua SHI You-Guo WANG nan-lin Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190

We present an optical spectroscopy study on Bi_(2)Se_(3),Bi_(2)Te_(3),Sn-doped Bi_(2)Te_(3) and Cu-intercalated Bi_(2)Se_(3) crystals grown by *** find that the plasma edge of Bi_(2)Se_(3) slightly shifts to lower energy with decreasing *** Cu-intercalated Bi_(2)Se_(3) shows a superconducting transition near 3.1 *** spectroscopy measurement shows that the plasma edge shifts substantially to higher frequency 1250 cm^(-1) indicating that Cu-doping supplies extra electrons to the system and further shifts the chemical potential ***,our measurement reveals that the plasma edge of Bi_(2)Te_(3),Sn doped Bi_(2)Te_(3-δ)Sn_(δ)(δ=0.67%)and Cu-intercalated Bi_(2)Se_(3) shift slightly to higher energies with decreasing *** with the band calculation,we attribute the blue-shift primarily to the reduction of effective mass of carriers with decreasing *** optical data yield useful information about the bulk electronic band structure of the superconducting doped topological insulator Cu_(x)Bi_(2)Se_(3)(x=0.14).

关键词： temperature optical slightly

World-class Xincheng gold deposit： An example from the giant Jiaodong gold province

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

Geoscience Frontiers 2016年第3期7卷 419-430页

作者： Liqiang Yang Jun Deng Ruipeng Guo lin'nan Guo Zhongliang Wang Binghan Chen XudongWang State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Beijing 100083. China Shandong Institute of Geological Survey Jinan 250013 China Xincheng Gold Company Shandong Gold Mining Stock Co. Ltd. Laizhou City 261438 Shandong Province China

The Jiaodong gold deposits are currently the most important gold resources（with Au reserves of〉4000 t） in China,and the leading gold-producing country globally（with Au production of ～428 t in2013）.Jiaodong is also considered as perhaps the only world-class to giant gold accumulation on the planet where relatively young gold ores（ca.130-120 Ma） were deposited in rocks that are 2 Ga *** Xincheng world-class high-grade gold deposit,with a proven reserve of 〉200 t gold,is one of the largest deposits in the giant gold province of the Jiaodong *** is located in the northwestern part of the jiaobei Uplift,and hosted by ca.132-123 Ma Xincheng quartz monzonites and *** zones are structurally controlled by the NE-trending and NW-dipping Jiaojia Fault and subsidiary faults,and are mainly restricted to the footwall of the *** dominant disseminated- and stockworkstyle ores are associated with strong sericitization,silicification,sulfidation and K-feldspathization,and minor carbonate wallrock alteration *** four mineralization stages are pyrite-quartz-sericite（stage 1）,quartz-pyrite（stage 2）,quartz-polysulfide（stage 3） and quartz-carbonate（stage 4）.Gold occurs dominantly as electrum,with lesser amounts of sulfide-hosted native gold and rare native silver and argentite,normally associated with pyrite,chalcopyrite,galena and sphalerite：the latter with proven resources of about 105 t Ag,713 t Cu,and 5100 t *** are three types of ore-related fluid inclusions：type 1 aqueous-carbonate（H2O-CO2）,type 2aqueous（liquid H2O＋vapor H2O）,and type 3 CO2（liquid CO2 and vapor CO2） *** temperatures range from 221 to 304℃ for type 1 inclusions,with salinities of 2.4-13.3 wt.%NaCl eq.,and bulk densities of 0.858-1.022 g/cm～*** δ～（34）S（CDT） values of hydrothermal sulfides are 4.3-10.6‰and δ～（18）O values of hydrothermal quartz have a median value of 13.0‰.δD values of fluid inclusions in hydrothermal quartz have a median value of-75‰.

关键词： Xincheng gold deposit Jiaodong Peninsula China Giant gold system Gold genesis Epizonal orogenic gold

Holographic Dark Energy Model is Consistent with Pantheon SN Ia Data

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2019年第4期71卷 421-426页

作者： Xin Li Su-Ping Zhao Li Tang Hai-nan lin Department of Physics Chongqing University

We constrain three cosmological models,i.e.,ACDM model, holographic dark energy(HDE) model and R_h = ct model by using the recent Pantheon compilation of type la supernovae(SN la), the direction measurements of Hubble parameter H(z), and the baryon acoustic oscillations(BAO). The spatial curvature is considered in the ACDM model and the HDE model. We show that the HDE model in a spatially flat and HDE dominate universe has the same behavior as Rh = ct model if the characteristic parameter of the HDE model C_0 approaches to infinity. Numerical results show that the ACDM model is the best favoured one among the three models. The HDE model is consistent with observational data, the best fitting value of C_0 is around 0.8, which implies that the Rh = ct model should be modified to be compatible with the present cosmological observational data. Combing all the datasets, we give strict constraint on the Hubble constant,where h_0=0.694 ± 0.020 for the ACDM model and h_0= 0.689 ±0.019 for the HDE *** results imply that the tension of Hubble constant between Planck collaborations and Riess et al. has been partially relaxed. The constraint on the spatial curvature is also given,where Ω_(k0) =-0.066 ± 0.165 for the ACDM model andΩ_(k0)=0.029 ± 0.067 for the HDE model.

关键词： holographic dark energy cosmological observations supernova general