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排序方式: 共有492条查询结果,搜索用时 15 毫秒
11.
Apiwat Muttamara Yasushi Fukuzawa Naotake Mohri Takayuki Tani 《Journal of Materials Processing Technology》2003,140(1-3):243-247
Electrical discharge machining (EDM) is used as a precision machining method for the electrically conductive hard materials with a soft electrode material. But recently we succeeded to machine on insulating material by EDM. The technology is named as an assisting electrode method. The EDMed surface is covered with the electrical conductive layer during discharge. The layer holds the electrical conductivity during discharge. For micro-EDM, the wear of tool electrode becomes lager ratio than the normal machining. So the micro-machining is extremely difficult to get the precision sample.
In this paper to obtain a fine and precise ceramics sample, some trials were carried out considering the EDM conditions, tool electrodes material and assisting electrode materials. Insulating Si3N4 ceramics were used for workpiece. The machining properties were estimated by the removal rate and tool wear ratio. To confirm the change of micro-machining process, the discharge waveforms were observed. The micro-machining of the Ø0.05 mm hole could be machined with the commercial sinking electrical discharge machine. 相似文献
12.
Fusaomi Nagata Takanori Mizobuchi Shintaro Tani Tetsuo Hase Zenku Haga Keigo Watanabe Maki K. Habib 《Artificial Life and Robotics》2010,15(1):106-110
In this article, a new desktop orthogonal-type robot, which has the capacity of stick-slip motion control based on cutter
location data, is presented for lapping small metallic molds with a curved surface. The robot consists of three single-axis
devices with a high position resolution of 1 μm. A thin wooden stick tool with a ball-end shape is attached to the tip of
the z-axis. In order to improve the lapping performance, a novel stick-slip motion control method is developed in the control system.
The small stick-slip motion is orthogonally generated in the direction of the tool’s movement. The effectiveness of stick-slip
motion control is examined through an actual lapping test of an LED lens cavity. 相似文献
13.
Codevelopmental learning between human and humanoid robot using a dynamic neural-network model. 总被引:1,自引:0,他引:1
Jun Tani Ryu Nishimoto Jun Namikawa Masato Ito 《IEEE transactions on systems, man, and cybernetics. Part B, Cybernetics》2008,38(1):43-59
This paper examines characteristics of interactive learning between human tutors and a robot having a dynamic neural-network model, which is inspired by human parietal cortex functions. A humanoid robot, with a recurrent neural network that has a hierarchical structure, learns to manipulate objects. Robots learn tasks in repeated self-trials with the assistance of human interaction, which provides physical guidance until the tasks are mastered and learning is consolidated within the neural networks. Experimental results and the analyses showed the following: 1) codevelopmental shaping of task behaviors stems from interactions between the robot and a tutor; 2) dynamic structures for articulating and sequencing of behavior primitives are self-organized in the hierarchically organized network; and 3) such structures can afford both generalization and context dependency in generating skilled behaviors. 相似文献
14.
Hiroaki Arie Takafumi Arakaki Shigeki Sugano Jun Tani 《Robotics and Autonomous Systems》2012,60(5):729-741
This paper introduces a novel neuro-dynamical model that accounts for possible mechanisms of action imitation and learning. It is considered that imitation learning requires at least two classes of generalization. One is generalization over sensory–motor trajectory variances, and the other class is on cognitive level which concerns on more qualitative understanding of compositional actions by own and others which do not necessarily depend on exact trajectories. This paper describes a possible model dealing with these classes of generalization by focusing on the problem of action compositionality. The model was evaluated in the experiments using a small humanoid robot. The robot was trained with a set of different actions concerning object manipulations which can be decomposed into sequences of action primitives. Then the robot was asked to imitate a novel compositional action demonstrated by a human subject which are composed from prior-learned action primitives. The results showed that the novel action can be successfully imitated by decomposing and composing it with the primitives by means of organizing unified intentional representation hosted by mirror neurons even though the trajectory-level appearance is different between the ones of observed and those of self-generated. 相似文献
15.
For chemical modification of gold-coated AFM tips with thiol or sulfide compounds, a new two-step precleaning procedure was studied. The two-step cleaning procedure involves (i) oxidation of organic contaminants on the AFM tips with ozone treatment and (ii) reduction of the oxidized gold surface by immersing the oxidized tip into pure hot ethanol at ca. 65 degrees C. The chemically modified tips prepared from gold-coated AFM tips precleaned by the two-step procedure gave almost the same tip characteristics as those chemically modified immediately after gold vapor deposition in a factory. The present two-step cleaning procedure can be used widely for chemical modification of commercially available gold-coated AFM tips with thiol or disulfide compounds for chemical force microscopy. 相似文献
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18.
Myo Than Htay Yuji Tani Yoshio Hashimoto Kentaro Ito 《Journal of Materials Science: Materials in Electronics》2009,20(Z1):341-345
ZnO nanowires were grown by an ultrasonic spray pyrolysis technique. The aspect ratio and size of the wire were dependent
mainly on the pH value of a precursor solution and the growth temperature. By high-resolution transmission electron microscopic
analysis and photoluminescence measurements, it was confirmed that the nanowires are monocrystalline with good optical quality. 相似文献
19.
Involvement of cytochrome P450 in hydroxylation of propylbenzene by Fusarium moniliforme strain MS31
Atsuko Uzura Takahiro Suzuki Tohoru Katsuragi Yoshiki Tani 《Journal of Bioscience and Bioengineering》2001,92(6):580
Fusarium moniliforme strain MS31 can oxidize propylbenzene to (R)-1-phenylpropanol with what may be a cytochrome P450. Hydroxylation of propylbenzene needed molecular oxygen, and NADPH as a coenzyme gave a higher yield than NADH. The hydroxylation proceeded further when FAD and FMN were added than in their absence, suggesting that the enzyme was a flavo-protein. Carbon monoxide inhibited the hydroxylation, as did other cytochrome P450 inhibitors such as SKF 525A and miconazole. These characteristics matched those of a microsomal cytochrome P450 monooxygenase system that contained NADPH-cytochrome P450 reductase. 相似文献
20.
Screening for microorganisms with specific characteristics by flow cytometry and single-cell sorting 总被引:1,自引:0,他引:1
Flow cytometry used in combination with single-cell sorting is a powerful technique for the identification and isolation of microbial cells with particular characteristics, especially when such cells grow more slowly than other cells in a large heterogeneous population. Many applications of flow cytometry with cell sorting, originally used by specialists studying mammalian cells, have been modified so that microorganisms also can be evaluated. The methods can now be used more widely because of the increasing availability of the expensive equipment. There are means for the fluorescence detection of a wide variety of properties, such as amounts of various cell components, specific sequences of peptides and nucleotides, cell functions, and enzyme activities. From the extensive literature, representative reports of an assortment of uses of flow cytometry with cell sorting are reviewed in this article, intended to introduce the technique and its many advantages to microbiologists. 相似文献