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Search Results: 1 - 10 of 120174 matches for " Wang Wenqing "
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New Identity-based Broadcast Encryption with Constant Ciphertexts in the Standard Model
Qing Wu,Wenqing Wang
Journal of Software , 2011, DOI: 10.4304/jsw.6.10.1929-1936
Abstract: How to build an efficient identity-based broadcast system with short ciphertexts is a main challenge at present. The existing constructions with constant size ciphertexts in the standard model are based on the non-standard cryptography assumption. In addition, these constructions cannot solve the trade-off between the private keys and ciphertexts. Hence these methods lead to schemes that are somewhat inefficient in the real world. To overcome these shortcomings, two schemes are introduced at first. The initial construction has constant size ciphertexts and O(|S|)-size private keys(where S denotes the set of receivers). Then the second scheme achieves constant size ciphertexts and constant size private keys which solve the trade-off between the private keys and ciphertexts. Furthermore, their security rests on the hardness of the decision Diffie-Hellman Exponent problem instead of other strong assumptions. However, both schemes only achieve a weak security-selective-identity security. Finally, two helpful constructions are proposed. They are constructed in the standard model and achieve full security which is stronger than selective-identity security.
A Review of Salam Phase Transition in Protein Amino Acids: Implication for Biomolecular Homochirality
Fan Bai,Wenqing Wang
Physics , 2002,
Abstract: The origin of chirality, closely related to the evolution of life on the earth, has long been debated. In 1991, Abdus Salam suggested a novel approach to achieve biomolecular homochirality by a phase transition. In his subsequent publication, he predicted that this phase transition could eventually change D-amino acids to L-amino acids as C -H bond would break and H atom became a superconductive atom. Since many experiments denied the configuration change in amino acids, Salam hypothesis aroused suspicion. This paper is aimed to provide direct experimental evidence of a phase transition in alanine, valine single crystals but deny the configuration change of D- to L- enantiomers. New views on Salam phase transition are presented to revalidate its great importance in the origin of homochirality.
Analysis and Application of Hydropower Real-time Performance Calculation  [PDF]
Dequn Feng, Zhiwei Wang, Pengbo Ma, Wenqing Wang
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B012
Abstract: The hydropower running and performance can be displayed and analyzed by the real-time remote system. Real-time performance data of the hydraulic turbine unit can be obtained through the analysis of real-time operating data of the hydraulic turbine unit. It can not only guide significance for long-term operation of hydraulic turbine unit, but also provide a reference for improving the Hydropower hydro efficiency, economic dispatch of hydraulic turbine unit and performance comparison before and after the overhaul.
3-D Motion Estimation of Elastic Body from Monocular Image Sequenc Using MRF with Entropic Constraints
Yunhua Zhang,Yaming Wang,Wenqing Huang
International Journal of Soft Computing , 2012,
Abstract: A novel approach to 3-D motion estimation of elastic body from monocular image sequence is proposed in this paper. First, with the establishment of feature point correspondence between consecutive image frames, the affine motion model and the central projection model are presented for local elastic motion. Then, in order to obtain the global motion parameters and overcome the ill-posed 3-D estimation problem, a framework of Markov Random Field (MRF) with entropic constraints is proposed. By incorporating the motion prior constraints into the MRF, the motion smoothness feature between local regions is reflected. This converts the ill-posed problem into a well-posed one and guarantees the robust solution. Experimental results from a sequence of synthetic image sequence demonstrate the feasibility of the proposed approach.
Biochirality and parity violating energy difference

WANG Wenqing,GONG Yan,LI Chen,

科学通报(英文版) , 2002,
Abstract: Biochirality originates from the chiral influences in the universe. The parity non-conservation of weak neutral current, which takes place through the exchange of neutral boson Z0 combined with the long range Coulomb interaction in atoms and molecules, produces a parity violating energy difference (PVED). In this note, the fact is to be indicated that there is a λ-type second order phase transition of D- and L-alanine (valine) at a certain critical temperature Tc. The PVED is to be calculated as 6×10-5eV/molecule by varieties of modern physical and chemical methods including the differential scanning calorimeter (DSC), SQUID, single crystal X-ray diffraction spectra,Iow-temperature 1H.MAS ssNMR, Raman spectra and ultrasonic measurement. A mechanism that differs from Salam's hypotheses is also discussed here.
Preparation of montmorillonite modified phenolic resin for shell process
Xiong Jianmin,Li Yuancai,Wang Wenqing
China Foundry , 2009,
Abstract: The development of montmorillonite modified phenolic resin under microwave irradiation heating was investigated. The effect of montmorillonite content and stirring time on the structure and morphology of synthetic resin was analyzed. The optimum processing procedure was found to be 45 min stirring time with 5.4% montmorillonite addition. Further, the platelet spacing increases with stirring time till montmorillonite exfoliated to nanoscales platelet. When montmorillonite is exfoliated, layered structure at nanoscale can be uniformly distributed in the resin. The overall performance of montmorillonite modifi ed phenolic resin is improved remarkably, such as fl ow ability, tensile strength and toughness property of resin coated sand. However, the gelation speed decreased slightly by adding montmorillonite.
Search for the Parity-Violating Effects between D- and L-alanine
Wenqing Wang,Fan Bai,Zhi Liang
Physics , 2002,
Abstract: The contribution of parity-violating effects to the phase transition of the D-/L-alanine crystals was confirmed by 1H CRAMPS solid state NMR, DC-magnetic susceptibilities and ultrasonic measurements. It was found that the spin relaxation mechanism of alpha-H nucleus of D-alanine molecule is different from L-alanine and the effect is stronger than that of L-alanine. In addition, D-alanine undergoes a magnetic phase transition at a field of 1.0T, which is confirmed by a peak-form ultrasonic attenuation curve. DC-magnetic susceptibilities measurements of L-alanine also indicate abnormal magnetic properties, which is accompanied by a step-form ultrasonic attenuation jump and its mechanism seems different from that of D-alanine. The phase transition is considered to act as a cooperating amplification mechanism of the P-odd effects at the molecular level.
Temperature dependence of optical rotation study on parity-violating phase transition of D-, L-, and DL-alanine
Fan Bai,Miao Zhang,Wenqing Wang
Physics , 2002,
Abstract: Chiral molecules are characterized by a specific optical rotation angle. An experimental method was presented to dissect the temperature dependence of the optical rotation angle with the molecular chirality of D-alanine, L-alanine and DL-alanine crystals. Salam hypothesis predicted that quantum mechanical cooperative and condensation phenomena may give rise to a second order phase transition below a critical temperature linking the transformation of D-amino acids to L-amino acids due to parity-violating energy difference. The temperature- dependent measurement of the optical rotation angle of D-, L- and DL-alanine crystals provided the direct evidence of the phase transition, but denied the configuration change from D-alanine to L-alanine. New views on Salam hypothesis are presented to demonstrate its importance in the application of low temperature enantiomeric separation and the origin of biochirality.
Studies on Extracting Microcystin-Lr from Microcystis Aeruginosa by Water Bath  [PDF]
Li Fang, Wenqing Liu, Nanjing Zhao, Jingbo Duan, Zhigang Wang, Yujun Zhang, Xue Xiao, Jing Liu, Gaofang Yin, Chaoyi Shi
Journal of Environmental Protection (JEP) , 2013, DOI: 10.4236/jep.2013.41B013
Abstract: Different temperatures of water bath was used to extract the intracellular microcystin-LR(MC-LR) of Microcystis aeruginosa. Researching the extraction efficiency under the suitable temperature, so that it could find out the best temperature and time for extracting MC-LR from Microcystis aeruginosa cells. Five equal Microcystis aeruginosa was used to find out the best temperature, extracting at 60℃, 70℃, 80℃, 90℃ and 100℃ for 15 minutes, respectively. Results showed that the content of MC-LR extracted with the water under 100℃ was the highest. But meanwhile, the type and the content of impurities was the highest, too. In addition, another six equal Microcystis aeruginosa was extract with the water under 100℃ for 5min, 10 min, 15 min, 20 min, 25 min and 30 min respectively. It was proved that 20 minutes was enough for extracting MC-LR from Microcystis aeruginosa, no long time was needed.
Revenue and Knowledge Cooperation Mechanisms between Business Incubators and Venture Capitalists for Collaborative Start-Ups  [PDF]
Wenqing Wu, Qing Han
Theoretical Economics Letters (TEL) , 2017, DOI: 10.4236/tel.2017.75091
Abstract: Business incubators and venture capital are effective instruments for supporting the development of new firms. The purpose of this paper is to explore cooperation mechanisms between business incubators and venture capitalists and find the equilibriums of the mechanisms. Also, this paper puts forward three mechanisms, revenue sharing mechanism, cost sharing mechanism and knowledge sharing mechanism, to discuss the cooperation between business incubators and venture capitalists. Meanwhile, we consider the effect of the business incubator’s altruism and compare the three cooperation mechanisms with and without altruism. The results indicate that the mechanism of revenue sharing leads to the highest incubator’s revenue sharing proportion. Additionally, the incubator’s revenue sharing proportion decreases even though its final profit increases when considering altruism. Therefore, the nonprofit incubator can be better for cooperating with the venture capitalist than the profit incubator. Finally, financial returns can influence their cooperation.
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