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排序方式: 共有502条查询结果,搜索用时 15 毫秒
141.
Fukushima T Kosaka A Yamamoto Y Aimiya T Notazawa S Takigawa T Inabe T Aida T 《Small (Weinheim an der Bergstrasse, Germany)》2006,2(4):554-560
Free-radical polymerization of an imidazolium ion-based ionic liquid bearing a methacrylate group, gelling with single-walled carbon nanotubes (SWNTs), allows fabrication of a mechanically reinforced, electroconductive soft material (bucky plastic). A film sample of this material displays an excellent conductivity of 1 S cm(-1) and a 120-fold enhancement of the Young's modulus at a 7 wt % content of SWNTs. The conductivity is temperature-dependent in the range 5-300 K, suggesting that the conductive process involves carrier hopping. Scanning electron and atomic force micrographs of a bucky plastic film display the presence of crosslinked networks consisting of finely dispersed SWNTs. Such nanotube networks, developed in the polymer matrix, likely suppress slipping of entrapped polymer molecules via a strong interfacial interaction and also facilitate intertubular carrier transport. Although a bucky plastic derived from a vinylimidazolium ion-based ionic liquid monomer shows a comparable conductivity to that of the methacrylate version, the film is brittle irrespective of the presence or absence of SWNTs. 相似文献
142.
Hande Demirkiran Arunesh Mohandas Motokazi Dohi Alonso Fuentes Kytai Nguyen Pranesh Aswath 《Materials science & engineering. C, Materials for biological applications》2010,30(2):263-272
Hydroxyapatite and Bioglass®-45S5 were sintered together creating new ceramic compositions that yielded increased apatite deposition and osteoblast differentiation and proliferation in vitro compared to hydroxyapatite. The sintered products characterized by X-ray diffraction, revealed hydroxyapatite as the main phase when small quantities (1, 2.5 and 5 wt.%) of bioglass was added. Bioglass behaved as a sintering aid with β-TCP (Ca3(PO4)2) being the minor phase. The amount of β-TCP increased with the amount of bioglass added. In compositions with larger additions of bioglass (10 and 25 wt.%), new phases with compositions of calcium phosphate silicate (Ca5(PO4)2SiO4) and sodium calcium phosphate (Na3Ca6(PO4)5) were formed respectively within amorphous silicate matrices. In vitro cell culture studies of the ceramic compositions were examined using bone marrow stromal cell (BMSC). Cell proliferation and differentiation of bone marrow stromal cells into osteoblasts were determined by Pico Green DNA assays and alkaline phosphatase (ALP) activity, respectively. All hydroxyapatite–bioglass co-sintered ceramics exhibited larger cell proliferation compared to pure hydroxyapatite samples. After 6 days in cell culture, the ceramic with Ca5(PO4)3SiO4 in a silicate matrix formed by reacting hydroxyapatite with 10 wt.% bioglass exhibited the maximum proliferation of the BMSC's. The ALP activity was found to be largest in the ceramic with Na3Ca6(PO4)5 embedded in a silicate matrix synthesized by reacting hydroxyapatite with 25 wt.% bioglass. 相似文献
143.
Hitoshi Inokawa Makoto Maeda Shunsuke Nishimoto Yoshikazu Kameshima Michihiro Miyake Takayuki Ichikawa Yoshitsugu Kojima Hiroki Miyaoka 《International Journal of Hydrogen Energy》2013
Nickel (Ni) nanoparticles were synthesized in micropores of zeolite by the adsorption and decomposition of a sublimated Ni organometallic compound, Ni(C5H5)2, to invent metallic catalysts with nanosize, which are smaller than 5 nm and keep the nanosize at high temperature. In the decomposition process, Ni species were partially decomposed by ultraviolet light irradiation and fixed in zeolite pores prior to thermal reduction under H2 flow. Note that the Ni nanoparticles showed an excellent thermal stability, because they kept the high dispersion with diameters smaller than 5 nm even after heating at 400 °C. On the other hand, the Ni particles supported on zeolite by a conventional method, which is an incipient wetness impregnation process, became larger than 10 nm after heating at the same temperature. The synthesized Ni nanoparticles acted as a metallic catalyst because they showed higher selectivity for H2 generation than C2H4 generation during ethanol steam reforming reaction. 相似文献
144.
Sanggil Han Shunsuke Yamamoto Anastasios G. Polyravas George G. Malliaras 《Advanced materials (Deerfield Beach, Fla.)》2020,32(48):2004790
Transistor-based ion sensors have evolved significantly, but the best-performing ones rely on a liquid electrolyte as an internal ion reservoir between the ion-selective membrane and the channel. This liquid reservoir makes sensor miniaturization difficult and leads to devices that are bulky and have limited mechanical flexibility, which is holding back the development of high-performance wearable/implantable ion sensors. This work demonstrates microfabricated ion-selective organic electrochemical transistors (OECTs) with a transconductance of 4 mS, in which a thin polyelectrolyte film with mobile sodium ions replaces the liquid reservoir. These devices are capable of selective detection of various ions with a fast response time (≈1 s), a super-Nernstian sensitivity (85 mV dec−1), and a high current sensitivity (224 µA dec−1), comparing favorably to other ion sensors based on traditional and emerging materials. Furthermore, the ion-selective OECTs are stable with highly reproducible sensitivity even after 5 months. These characteristics pave the way for new applications in implantable and wearable electronics. 相似文献
145.
Yoshimasa Takahashi Itaru Ashida Shigeo Arai Kimitaka Higuchi Yuta Yamamoto Shunsuke Muto 《International Journal of Fracture》2018,209(1-2):223-229
In this study, we have investigated microstructures of the delamination cracks observed from tensile and fracture toughness test specimens using an API X70 pipeline steel. It is found that the delaminations observed from both tensile and toughness specimens are intergranular fractures. At the occurrence, characteristics of brittle fracture were observed, but it was found not to be a brittle fracture as the delaminations were induced by plastic deformation. It is shown that severe plastic deformation produced strain concentration around particles located along grain boundaries and caused decohesion between adjacent grains, resulting in intergranular fracture. 相似文献
146.
Masuda Senichi Hosokawa Shunsuke Nakatani Hajime 《Industry Applications, IEEE Transactions on》1985,(6):1377-1386
The corona-producing characteristics of a corona wire energized by a very short pulse voltage superposed on top of a dc base voltage are investigated in consideration of its application in electrostatic precipitators. A ``formation region' of the pulse-induced negative corona is determined in terms of a Vb - Vp domain where Vb represents the dc base voltage and Vp the pulse peak voltage. A pulse voltage propagates in a form of a traveling wave along a transmission line out of an elongated corona wire and collection plates. It produces streamer coronas and loses its energy during propagation and finally becomes inactive so as not to produce coronas. As a result, a longitudinal distribution of the ionic current shows a decay towards the end of the line. An ``effective pulse energy' We is defined as an energy to produce uniform current distribution on the entire collection plates. This value of We amounts to 0.8 J for a 200-m corona line. A ``pulse peaking' to squeeze more corona energy from the pulse after corona-induced deterioration is tested using partial and total reflections, and its effectiveness is confirmed. A matched feeder concept to enable uniform distribution of pulse power to a number of corona transmission lines is also presented. 相似文献
147.
Shunsuke Kudoh Koichi Ogawara Miti Ruchanurucks Katsushi Ikeuchi 《Robotics and Autonomous Systems》2009,57(3):279-288
In this paper, we describe a painting robot with multi-fingered hands and stereo vision. The goal of this study is for the robot to reproduce the whole procedure involved in human painting. A painting action is divided into three phases: obtaining a 3D model, composing a picture model, and painting by a robot. In this system, various feedback techniques including computer vision and force sensors are used. As experiments, an apple and a human silhouette are painted on a canvas using this system. 相似文献
148.
Koji Ohishi Author Vitae Author Vitae Tadashi Dohi Author Vitae 《Journal of Systems and Software》2009,82(3):535-543
Gompertz curve has been used to estimate the number of residual faults in testing phases of software development, especially by Japanese software development companies. Since the Gompertz curve is a deterministic function, the curve cannot be applied to estimating software reliability which is the probability that software system does not fail in a prefixed time period. In this article, we propose a stochastic model called the Gompertz software reliability model based on non-homogeneous Poisson processes. The proposed model can be derived from the statistical theory of extreme-value, and has a similar asymptotic property to the deterministic Gompertz curve. Also, we develop an EM algorithm to determine the model parameters effectively. In numerical examples with software failure data observed in real software development projects, we evaluate performance of the Gompertz software reliability model in terms of reliability assessment and failure prediction. 相似文献
149.
Shunsuke Kobayashi Brindaban Kundu Tomohiro Miyama Yukihide Shiraishi Hiroya Sawai Naoki Toshima Masaya Okita Kiyofumi Takeuchi Haruyoshi Takatsu 《Journal of the Society for Information Display》2011,19(11):787-792
Abstract— The fabrication and demonstration of field‐sequential‐color (FSC) LCDs using modules of narrow‐gap twisted‐nematic (NTN) LCDs with and without doping of newly synthesized PγCyD‐ZrO2 nanoparticles is reported. Two types of FSC‐LCDs are demonstrated: one is a direct multiplexed NTN‐LCD and the other is TFT driven. The advantages of FSC‐LCDs include their high legibility even under direct sunlight, and the mechanism for the doping of nanoparticles in LCDs is discussed. 相似文献
150.
Hamed A Masamune K Tse ZT Lamperth M Dohi T 《Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine》2012,226(7):565-575
Minimally invasive surgery is a widely used medical technique, one of the drawbacks of which is the loss of direct sense of touch during the operation. Palpation is the use of fingertips to explore and make fast assessments of tissue morphology. Although technologies are developed to equip minimally invasive surgery tools with haptic feedback capabilities, the majority focus on tissue stiffness profiling and tool-tissue interaction force measurement. For greatly increased diagnostic capability, a magnetic resonance imaging-compatible tactile sensor design is proposed, which allows minimally invasive surgery to be performed under image guidance, combining the strong capability of magnetic resonance imaging soft tissue and intuitive palpation. The sensing unit is based on a piezoelectric sensor methodology, which conforms to the stringent mechanical and electrical design requirements imposed by the magnetic resonance environment The sensor mechanical design and the device integration to a 0.2 Tesla open magnetic resonance imaging scanner are described, together with the device's magnetic resonance compatibility testing. Its design limitations and potential future improvements are also discussed. A tactile sensing unit based on a piezoelectric sensor principle is proposed, which is designed for magnetic resonance imaging guided interventions. 相似文献