This article aims to introduce and explain the design of a new string-based multi-finger haptic interface named SPIDAR-MF(Space Interface Device for Artificial Reality Multi-Finger), which can display a 3 degree-of-freedom spatial force feedback for each finger of a human hand through 4 strings attached to each fingertip. By measuring the lengths of 4 strings attached to it individually, the SPIDAR-MF can calculate the position of each fingertip, and then give force feedbacks to each fingertip by using motors to adjust tensions of the strings. A rotary frame which motors are mounted on is proposed to solve the problem that strings may be twisted because of the movement caused by the fingers. The experimental results show that SPIDAR-MF is effective and feasible to provide a multi-finger haptic interaction environment with objects in the virtual world.

Palladium -silver acetate-catalyzed cross coupling of vinyl triflates and 1-alkynes was investigated. This strategy offered a very straightforward and efficient method for access to conjugated alkynyl cycloalkenones from the conjugated vinyl triflates and 1-alkynes. Moreover, the triflates derived from 1,3-cycloalkadione needed no further purification and could be reacted immediately with 1-alkynes to provide the conjugated alkynyl cycloalkenones in excellent overall yields.

Based on econometrics principles of the cointegration test and the error correction model, this research develops an innovative approach to quantitatively examine the ripple effect of house prices between Chinese big cities. Eight main capital cities' house price indexes (1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007) are selected and calculated using unit root test, Engle-Granger test and error correction model. The empirical results show that there is ripple effect of house price in nationwide eight cities. Simultaneously, the corresponding ripple effect pattern graph of nationwide eight cities is generated. It significantly shows that Shenzhen is original region of nationwide house price changing.

A convenient approach to 17-ketosteroids by the iodine-promoted cleavage of the C-17-dihydroxy acetone side chain of corticosteroids is described. Treatment of steroids containing the C-17-dihydroxyacetone side chain with iodine and an excess of aqueous ammonia in acetonitrile at 50°C, affords high yields of the corresponding 17-ketosteroids.

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