Five reinforced concrete (RC) beams with epoxy-bonded carbon fiber reinforced polymer (CFRP) sheets were loaded symmetrically with sinusoidal dynamic loads simulating vehicles loads. One sustained loaded RC beam strengthened with externally bonded CFRP sheets and two control RC beams were experimentally investigated. Variables considered in this experimental program included compressive strength of the concrete, reinforcement ratio, bonded length, and load range. The experimental program included two parts: dynamic test and static test. Application of CFRP sheets to the bottom of five RC beams was conducted under dynamic loads and then the static test began after 174,000 dynamic cycles. The results demonstrate the feasibility of rehabilitating and strengthening damaged RC beams with CFRP sheets while the beams are under simulating vehicles loads. The static test program shows that the application of CFRP to RC beams results in increased strength and enhanced performance.

Aiming at vibration analysis of seamless turnout on bridge,the rail-turnout-tie-bridge spring-damping vibration model was built by using finite element method.The spatial vibration equation sets of the system were derived by using the principle of invariant total potential energy in elastic system dynamics and the set-in-right-position rule for formulating matrixes.Taking Tian-luo major bridge in Wenzhou-Fuzhou railway line for passengers as an example,the scheme of a crossover combined with two No.38 turnouts on the bridge was drawn up.The spatial dynamic responses of the system were analyzed when China Star high speed train with 1 locomotive and 4 passenger cars at the speed of 140km/h is running through turnout branch.The influences of train velocity,the lateral stiffness under rail,the lateral uniform stiffness under tie and the height of pier on the vibration of train-turnout-bridge system were analyzed.The results show that bridge vibration leads the displacement of rail and turnout increase,the dynamic responses of train increase only a little,and it has little effect on the acceleration of turnout and the wheel/rail force.The system responses increase with the increase of train velocity,the decrease of lateral stiffness under rail,the decrease of lateral uniform stiffness under tie,and the increase of pier height.

A reliability analysis approach for concrete elements affected by corrosion of reinforcement in the anchorage zone is developed.Effects of various parameters,such as length and width of corrosion-induced crack,cover depth,initial anchorage length,and stirrup ratio,on the anchorage reliability were analyzed by the first-order second-moment method.Results show that the effect of corrosion-induced crack length on the reliability index β0of anchorage is negligible when the crack on the concrete surface is just appearing,but with the crack widening,the β0 value is reduced significantly;the variation of cover depth and anchorage length results in the considerable changes of β0;the variation of diameter or space of stirrups has little influence on the anchorage resistance,thus the variation of β0 is quite slight.

The present study were designed to investigate the effect of lactate dehydrogenase(LDH) on the sex-ratio of Keerqin fine-wool sheep.Firstly, eighty sheep were divided into two groups:LPH treated group and the control group.Then each group was treated with CIDR to reach homochronous.From the fourth day after CIDR treatment, LDH solution were injected every 48 h for three times.Sheep were artificial inseminated with fresh semen after oestrum.The pH of vagina secretion were measured with PHS-3C Acidimeter.The total activity of LDH and concentration of lactic acid in blood of pregnant sheep were measured with Markert methord.The sheep pregnancy ratio, sex-ratio were also recorded.The results showed that there were no significant difference in pH of vagina secretion between the two groups(6.83 0.2 vs.7.00 0.2, P 0.05).However, the total activity of LDH, concentration of lactic acid in blood and sex radio of lamb in LDH treated group(356.5 137.0, 1.85 0.2 mmol and 0.4:1) differed significantly with those of control group(157.6 39.5, 9.64 mmol 0.2 and 1.1:1)(P 0.05).In conclusion, LDH treatment could change the the total activity of LDH, concentration of lactic acid in blood and sex radio of lamb.

The research on the two types of fiber reinforced ferroconcrete which are steel fiber reinforced ferroconcrete and polypropylene fiber reinforced ferroconcrete are introduced.Studies show that the crack resistance performance and the bearing capacity of fiber reinforced ferroconcrete are greatly improved by the composites of short fiber and steel mesh.Fiber reinforced ferroconcrete is a composite material with high strength and good crack resistance performance.

Steel fiber-reinforced ferroconcrete (FC) is a new type of high-strength composite material. In order to reveal the flexural behaviors of FC bending members, twelve T-shape beams reinforced by FC were used to test the flexural behaviors, and the beam crack and its development as well as the bending capacity were analyzed. Then, according to the experimental data, a formula was proposed to calculate the bending capacity of the T-shape beams. Moreover, the parameters affecting the flexural behaviors of FC bending members were analyzed. Tested results show that the combination of steel fiber and steel wire mesh greatly improves the bending performance and crack resistance of reinforced concrete beams.

To research the performance of damaged reinforced concrete(RC) beams strengthened with carbon fiber reinforced polymer(CFRP),loading tests on 17 beams were carried out.The test results indicate that there is little effect of corrosion damage and pre-loading crack damage on properties of beams strengthened with CFRP;bonding longitudinal and transverse CFRP simultaneously can greatly improve the capacity of beams and the function of CFRP mainly performs in phase with crack.In addition,the load and deflection curve of RC beams strengthened with CFRP is formed by two beelines for those experienced corrosion and pre-loading damage;the test results are a little higher than the calculated values of capacities for the test beams based on the shear-resistance calculating formula in Technical Specification for Strengthening Concrete Structures with Carbon Fiber Reinforced Polymer Laminate(CECS 146:2003) for safer purpose,a rational reduction factor is suggested to be introduced into calculating formula for CFRP strengthening damaged RC beams by refering to formula in the national specification.

A total of 96 specimens of polypropylene fiber reinforced ferroconcrete(PFOC) divided into 32 groups were investigated in the flexural test.The flexural bearing capacity of polypropylene fiber reinforced ferroconcrete slabs in different stage of cracks was analyzed.Based on the experimental data,the formula for calculating the bending capacity of polypropylene fiber reinforced ferroconcrete slabs is also proposed.A floor structure of polypropylene fiber reinforced ferroconcrete slab is compared with the floor structure of reinforced concrete slab.

同期发情过程中,用冷冻精液对试验母羊进行人工受精,对照组母羊用新鲜的稀释后25℃保存20小时精液输精;试验所产羔羊的性别比例发生改变;处理组公羔约占60.98%,母羔约占39.02%;母羊的空怀数、空怀率均无统计学上的差异.但是,与对照组相比处理组的产羔数有所下降,下降约10%.

Aimed at seamless turnout on bridge,the rail-turnout tie-bridge spring-damping vibration model was built by using finite element method.The train-turnout-bridge spatial vibration equation sets were formulated by using the principle of total potential energy with stationary value in elastic system dynamics and the "set-in-right-position" rule for formulating matrixes.Taking Tian-luo major bridge in Wenzhou—Fuzhou railway line for passenger as an example,it was assured that there was a crossover combined with two No.38 turnouts on the bridge.The influences of some factors on the train-turnout-bridge system coupling vibration with train running in the main direction were analyzed,such as train velocity,the vertical stiffness under rail,the vertical uniform stiffness under tie,the amplitude of vertical irregularity in turnout area,the height of beam and so on.The results show that the system responses increase with the increase of train velocity,the increase of the amplitude of vertical irregularity in turnout and the decrease of the height of beam.The vertical stiffness under rail has different influences on different responses of the system.Turnout responses decrease with the increase of the vertical uniform stiffness under tie.

A total of 201 specimens of polypropylene fiber reinforced ferroconcrete(PFOC) divided into 67 groups are investigated in the flexural test.The effects on the flexural behavior of polypropylene fiber reinforced ferroconcrete slabs with and without steel bars in different stages of cracks are analyzed.Based on the experimental data,the formula for calculating the bending capacity of polypropylene fiber reinforced ferroconcrete slabs with and without steel bars is also proposed.Test results show that the best volume fraction of polypropylene fiber in the slabs is 0.07% and the polypropylene fibers in the slabs leave the cracking and improve the crack resistance performance of concrete.Steel wire meshes in the slabs have the main influences on the bending capacity of polypropylene fiber reinforced ferroconcrete slabs.The bending capacity and the crack resistance performance of polypropylene fiber reinforced ferroconcrete slabs are greatly improved by the composites of polypropylene fiber and steel wire mesh.

Comparisons of bond tests between moisture-curable adhesives developed by Guangzhou Sihang Institute of Technology and those of Araodite adhesives are done,and the tests results demonstrate that there is similar bond of the moisture-curable adhesives bonded on wet and dry concrete surface,and the values of bond are not lower than those of Araodite adhesives bonded on dry concrete surface.In addition,comparing loading tests is also done for the two kinds of adhesives bonded on wet and dry beam surface,and the tests results ulteriorly confirm that there is good feasibility of the moisture-curable adhesives used on wet concrete surface for strengthening.The results are very helpful for CFRP to be used in strengthening coastal reinforced concrete.

The function that carbon fiber reinforced polymer(CFRP)bonded externally prevents effectively chloride ions from entering concrete was confirmed by two groups of laboratory accelerated penetration tests.The effectiveness of CFRP material to prevent chloride ions was confirmed by tests of type 1;and similar conclusion was also drawn in the test of type 2 when CFRP externally bonded on concrete specimens.Test results show that,for coastal concrete structures,there is not only function of strengthening of CFRP,but also that of preventing chloride ions from penetrating into concrete,and consequently to prolong the initiation period of rebars corrosion.It is also confirmed by test that there is similar function of CFRP and coating on the surface of concrete to shield concrete against chloride ions.Therefore,it is suggested that CFRP bonded externally and coating or other surface prevention measures are applied jointly to form an integrated surface prevention system when CFRP is applied in strengthening coastal concrete structures.Considering the limitation involving with time of the effective shielding function of CFRP,an equation used for residual lifetime prediction of concrete structures bonded externally with CFRP is derived from Fick's dispersion law.Overall,the conclusion may be used for reference when CFRP is applied to strengthen coastal concrete structures.

The function that carbon fiber reinforced polymer ( CFRP) bonded externally to prevent effectively chloride ions from diffusing into concrete is confirmed by 2 groups of laboratory accelerated penetration tests. The effectiveness of CFRP material to prevent Cl- is confirmed by tests of 1(st) group; and similar conclusion also is drawn in 2(nd) groups of test for CFRP externally bonded on concrete specimens. Thus, for coastal concrete structures, there is not only strengthening function of bonding CFRP, but also that of preventing chloride ion from penetrating into concrete, and consequently to prolong the initiation period of rebars corrosion. It is also confirmed by test that there is similar function of CFRP and coating on the surface of concrete to shield concrete against chloride ions. Therefore,. it is suggested that CFRP bonded externally and coating or other surface protection measures are applied jointly to form an integrated surface prevention system when CFRP is applied in strengthening coastal concrete structures. Considering the limitation involving with time of the effective shielding function of CFRP, an equation used for residual lifetime prediction of concrete structures bonded externally with CFRP is derived from Fick's diffusion law. Overall, the conclusion may be used for recommendation when CFRP is applied to strengthen coastal concrete structures.

试验结果表明,用乳酸脱氢酶（LDH）处理的发情奶牛,人工授精后子代中母犊比率明显增多,占到72.73%,怀孕率有所降低,为73.33%,畸形率无明显变化,血液中的乳酸含量增多;此方法可加速优良种畜的繁殖。

Aiming at turnout on bridge, the rail-turnout tie-bridge spring-damping vibration model was built by using finite element method. The train-turnout-bridge spatial vibration equations were formulated by using the principle of total potential energy with stationary value in elastic system dynamics and the "set-in-right-position" rule for formulating matrixes. Taking a continuous frame bridge with a crossover combined with two No.38 turnouts laid on as an example, the train-turnout-bridge spatial vibration dynamic responses were analyzed when "China Star" high speed train ran through turnout in the straight direction at the speed of 200km/h. The results were compared with those of train running through turnout on roadbed and of train running through continuously welded rail track on bridge. The calculation results show that bridge leads the displacement of rail and turnout tie to increase very much, the dynamic responses of train increase a little, and it has little effect to the acceleration of the system and wheel/rail force. Turnout leads the acceleration of beam to increase a little and the dynamic responses of train to increase very much.

通过对配筋钢纤维增强钢丝网混凝土T形梁抗弯承载力试验,研究了钢纤维增强钢丝网混凝土T形梁正截面抗弯承载力的计算,并对影响钢纤维增强钢丝网混凝土受弯构件抗弯性能的因素进行了分析.试验结果表明,钢纤维与钢丝网的复合,能起到显著的增强效果,能有效地提高混凝土受弯构件的抗裂性能和抗弯承载力.

The possibility of safely extending the service life of the existing structures is a problem that has become more and more important for the structural engineers and asset managers.A performance-based model for service life prediction of the steel-corroded concrete structures located in an atmospheric environment is presented.In this model,the life cycle of in-service concrete structures consists of four phases of lifetime,e.g.,the time periods from the completion of a newly-built structure to corrosion initiation in the structure,from the initiation of corrosion to corrosion-induced concrete cracking,from the concrete cracking to acceptable longitudinal crack width,and from loss in serviceability to acceptable ultimate limit state.Based on the structural response measured by strength and serviceability,reliability approaches were employed to determine the time period for each phase of service life.The method presented can be used to assess residual life of the existing structures in an atmospheric environment and make decisions with regard to its maintenance and strengthening for structural engineers and asset managers.

肺癌是目前人类发病率和死亡率最高的恶性肿瘤,其发病与基因多态性及遗传易感性之间可能存在联系,尤其是癌基因和抑癌基因的突变在肺癌的发生、发展和预后中具有重要意义。其中,p53r、as基因频发点突变,在肺癌基因诊断中具有非常重要的作用。由此,肺癌基因与防癌抑癌基因的发现、研究和分析将大大地有助于临床对肺癌的诊断、治疗及预防。

Turnout,slab,beam,pier and abutment were considered as an integrated system.A finite element mechanics model was established which can calculate the interaction between bridge and ballastless turnout under temperature force.The nonlinear equation sets of the model were established according to the variational principle and the "set-in-right-position" rule for formulating matrix.The law of temperature force and displacement of rail and pier/abutment were studied when ballastless turnout was laid on long span bridge.The numerical examples show that the expansion joint must be installed when ballastless turnout is laid on long span bridge.The displacement of rail increases when ballastless turnout is laid on continuous bridge with the expansion joint being installed.The displacement of rail can decrease if ballastless turnout is laid on continuous frame bridge.