Cover: The figure shows the formation of a block‐selective polyrotaxane composed of PEI‐b‐PEG‐b‐PEI copolymer by pH‐controlled threading of cyclodextrins (CDs) onto the copolymer. While the CD threads indiscrimi...
Cover: The figure shows the formation of a block‐selective polyrotaxane composed of PEI‐b‐PEG‐b‐PEI copolymer by pH‐controlled threading of cyclodextrins (CDs) onto the copolymer. While the CD threads indiscriminately at high pH onto the entire block copolymer, lowering the pH to 4.4 in the presence of 9‐anthraldehyde results in expulsion of the macrocycles from the PEI blocks and capping of the rotaxane by a one‐pot sequence. Further details can be found in the article by H. S. Choi, T. Ooya, and N. Yui * on page 420.
Billions of portable computing devices such as mobile phone, laptop and palmtop computers are becoming widely available. Since these devices are wireless and therefore mobile, they will derive great benefit form Mobil...
详细信息
Electrical contacts are widely used for telecommunication and electric power systems as a device mechanically making and breaking electrical current. In the future, they will be more indispensable. In this paper, we e...
详细信息
Electrical contacts are widely used for telecommunication and electric power systems as a device mechanically making and breaking electrical current. In the future, they will be more indispensable. In this paper, we explored the possibilities of early lifetime prediction of Ag-Ni contacts for an electromagnetic contactor. Contact erosion often leads to the contact failure and the system fault. Especially, for heavy electrical systems, the failure can cause critical troubles. We must estimate approximate periods of the system fault to avoid the troubles. The tests of lifetime are very important for that purpose. However, the tests often require an enormous amount of time. We investigate the possibilities of lifetime prediction of contacts. In the past work, we confirmed that the mass loss could lead to the contact failure of Ag-Ni contacts and the mass loss of cathode was in proportion to total arc energy generated between the anode and the cathode. At this time we measured the mass losses of cathodes with a few making and breaking operations for more samples, and accurately predicted the mass losses after a lot of operations. We compared them with experimented results of a lot of operations.
For efficient Computer Supported Cooperative Work (CSCW) audio conferencing is an essential component where video and text are add-ons. The specifications for enabling CSCW over Internet are incomplete if they are bli...
详细信息
EBIFRY (a language for EmBedded Instruments in the FactoRY) is a programming language for embedded systems designed with the joint objectives of providing the simplicity of a scripting language while making it possibl...
详细信息
The growing complexity of distributed systems in terms of hardware components, operating system, communication and application software and the huge amount of dependencies among them have caused an increase in demand ...
详细信息
This paper studies signal control methods which control congestion lengths systematically on two-way traffic arterials and in two-way traffic networks. The signal control system of the congestion length is described b...
详细信息
A general solution for the diffusion equation applied to moving interfaces in multicomponent systems is presented. The solution is simultaneously solved with the chemical potential equations describing multicomponent ...
详细信息
A general solution for the diffusion equation applied to moving interfaces in multicomponent systems is presented. The solution is simultaneously solved with the chemical potential equations describing multicomponent thermodynamic equilibrium, ensuring local equilibrium at the interface. Phase kinetics and thermodynamics are rigorously linked irrespective of the number of solutes in the system and their difference in diffusivity. The mathematical compactness of the equations resulted in an increase of the computations speed as compared to other approaches. The model is applied to calculate the reaustenitisation kinetics for TRIP and Dual Phase steels with four and more components. The progress in ferrite, cementite and austenite compositions and volume fraction for a variety of heating rates and isothermal holding temperatures is presented.
This paper examined the effects of the positioning of car-navigation displays on the visual search of drivers for the safety driving of the elderly. A driving simulation with a car-navigation system was conducted, by ...
详细信息
The head mounted display （HMD） is widely used in virtual reality technology. In common HMD, however, the binocular disparity is set to an equal fixed value in the entire range of view. Such HMD systems have several ...
详细信息
The head mounted display （HMD） is widely used in virtual reality technology. In common HMD, however, the binocular disparity is set to an equal fixed value in the entire range of view. Such HMD systems have several shortcomings when used for wide views. In this study, in order to realize a natural stereo sensation of HMD with wide view, we measure the characteristics of binocular stereo perception and binocular light perception. Results show that both the stereoacuity and light sensitivity decrease as the retina＇s eccentricity increases from fovea to periphery. However, the decrease of the stereoacuity is more rapid than that of the light sensitivity. These results suggest that the binocular disparity at the peripheral field should be small, otherwise double images would be observed instead of a stereo view. Based on the results we develop a relative binocular stereoacuity model which can be applied for the design of HMD systems with wide view.
暂无评论