摘要：
Conservation of natural resources and preservation of environment are the essence of any development. The use of recycled aggregate concrete(RAC) is an attempt and an answer to some of the problems in constructional engineering. So recycling the decasting concrete catches more attention in the world. It depends on the strength for construction bearing to utilize recycled concrete(RC), but the strength calculation formula of RC has not been put forward yet. There is a linear relation between the common concrete compression strength and cement strength with cement-water mass ratio, whether this relationship also exists in recycled concrete or not it should be verified by experiment. Based on some experiments, the relationship between recycled concrete compression strength and its cement-water mass ratio was established, and the method to determine A′ and B′ values in Bolomey Formula was discussed.
作者机构：
[Yu, Hongwei] Hunan Normal Univ, Dept Phys, Changsha 410081, Hunan, Peoples R China.;Hunan Normal Univ, Inst Phys, Changsha 410081, Hunan, Peoples R China.;Cent S Univ Forestry & Technol, Sch Sci, Changsha 410004, Hunan, Peoples R China.;Cent S Univ Forestry & Technol, Inst Phys, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Yu, Hongwei] H;Hunan Normal Univ, Dept Phys, Changsha 410081, Hunan, Peoples R China.
摘要：
We examine observational constraints on the generalized Chaplygin gas (GCG) model for dark energy from the 9 Hubble parameter data points, the 115 SNLS Sue la data and the size of baryonic acoustic oscillation peak at redshift, z = 0.35. At a 95.4% confidence level, a combination of three data sets gives 0.67 <= A(s) <= 0.83 and -0.21 <= alpha <= 0.42, which is within the allowed parameters ranges of the GCG as a candidate of the unified dark matter and dark energy. It is found that the standard Chaplygin gas model (alpha = 1) is ruled out by these data at the 99.7% confidence level. (c) 2006 Elsevier B.V. All rights reserved.
期刊：
International Journal of Modern Physics D,2007年16(11):1783-1789 ISSN：0218-2718
通讯作者：
Wu, Puxun
作者机构：
[Wu, Puxun] Cent S Univ Forestry & Technol, Inst Math Phys, Changsha 410004, Hunan, Peoples R China.;Cent S Univ Forestry & Technol, Sch Sci, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Wu, Puxun] C;Cent S Univ Forestry & Technol, Inst Math Phys, Changsha 410004, Hunan, Peoples R China.
关键词：
Dark energy;generalized Chaplygin gas;type Ia supernovae
摘要：
The simplified generalized Chaplygin gas (GCG) model as a candidate of UDME is studied in this paper. By using the latest 162 ESSENCE type Ia supernovae (Sne Ia) data, 30 high red shift Sne Ia data and the distance ratio from z = 0.35 to z = 1089 (the red shift of decoupling), we obtain Omega(k) = 0.076(-0.077)(+0.093) and alpha = 0.90(-0.07)(+ 0.04) at a 95.4% confidence level. In addition the deceleration parameter for this simplified GCG model is investigated, and we find that the universe, at a 1 sigma con. dence level, enters the acceleration era at the red shift z(q=0) similar to 0.53 - 0.66 and possesses an acceleration -q(z=0) similar to 0.66 - 0.78 at present.
作者机构：
Cent S Forestry Univ, Changsha, Peoples R China.;Univ Maine, Orono, ME USA.;Cent S Univ Forestry & Technol, Changsha, Peoples R China.;Guilin Inst Tourism, Guilin, Peoples R China.
摘要：
The alpha-proteobacteria of the genus Wolbachia is a widespread group of maternally inherited endosymbionts of arthropod and nematode hosts. Wolbachia infection induces a range of host phenotypes, including cytoplasmic incompatibility, male killing, feminization, and induction of thelytokous parthenogenesis. Heterogony (cyclical parthenogenesis) is a remarkable characteristic of oak gallwasps, Cynipini, the largest tribe of the Cynipidae. A few species of Cynipini are exceptional in that they are univoltine and exhibit thelytokous parthenogenesis, probably because they lost the arrhenotokous generation of their heterogonic ancestor species due to Wolbachia infection. In this study, the presence of Wolbachia was detected using polymerase chain reaction primers for the wsp genes in a thelytokous parthenogenetic species [Dryocosmus kuriphilus (Yasumatsu)] (Hymenoptera: Cynipidae: Cynipini). Approximately 29.8 and 87.1% of adults of the Zhuzhou and Fuzhou strains, respectively, were infected with Wolbachia while all females of the remaining four strains collected from other localities in China were Wolbachia free. The length of the wsp fragment of Zhuzhou and Fuzhou strains was found to be 573 and 561 bp, respectively. The nucleotide sequence of the bacterial wsp fragment indicated that the endosymbiotic bacteria of the Zhuzhou and Fuzhou strains are members of supergroup A, but belong to different clades; they probably originated from two independent infection events. In conclusion, thelytokous parthenogenesis of D. kuriphilus is not caused by Wolbachia infection and the deletion of the arrhenotokous generation is thus not associated with such an infection.
作者机构：
[Luo Ying-she] Cent S Univ Forestry & Technol, Inst Rheol Mech & Mat Engn, Changsha 410004, Peoples R China.;Xiangtan Univ, Minist Educ, Key Lab Low Dimen Mat & Applicat Technol, Xiangtan 411105, Peoples R China.;Xiangtan Univ, Inst Fundamental Mech & Mat Engn, Xiangtan 411105, Peoples R China.;Xiangtan Univ, Coll Informat Engn, Xiangtan 411105, Peoples R China.
通讯机构：
[Luo Ying-she] C;Cent S Univ Forestry & Technol, Inst Rheol Mech & Mat Engn, Changsha 410004, Peoples R China.
会议名称：
4th Pacific Rim Conference on Rheology
会议时间：
AUG 07-11, 2005
会议地点：
Shanghai, PEOPLES R CHINA
会议主办单位：
Cent S Univ Forestry & Technol, Inst Rheol Mech & Mat Engn, Changsha 410004, Peoples R China.^Xiangtan Univ, Minist Educ, Key Lab Low Dimen Mat & Applicat Technol, Xiangtan 411105, Peoples R China.^Xiangtan Univ, Inst Fundamental Mech & Mat Engn, Xiangtan 411105, Peoples R China.^Xiangtan Univ, Coll Informat Engn, Xiangtan 411105, Peoples R China.
关键词：
polymers;displacement control;rheological property;stress relaxation;finite element
摘要：
The stress relaxation behavior of polypropylene (PP) was investigated at room temperature. Displacement controlled experiment was simulated using engineering computational software ANSYS and performed on PP. Both results were compared with each other. The utility of numerical simulation was also discussed. The experiment results are well in agreement with the numerical ones.
摘要：
A stable superhydrophobic PS surface was obtained by a simple method in atmosphere. The water contact angle and sliding angle of the superhydrophobic PS surface are 156 ± 1.9°and 2 ± 1.9°, respectively. Kept at temperatures between 5 °C and 40 °C in ambient atmosphere for 3 months, and any decrease in water contact angle was not observed. SEM shows that the surface structure is comprised of many uniform micro-spheres with the diameter range of 1–4 μm. A brief explanation to the formation of the special microstructure was put forward.
