Shaking test research on connection modes between block infill wall and frame beam

In order to achieve an optimal anti-seismic behavior,or rather stability,the out-of-plane stability of infill wall in frame has been researched with the shaking test of four sets of two-layer infill wall,in which four different connection modes of filled with inclined bricks on the top,disconnection,flexibility and semi-flexibility were adapted.The acceleration and displacement response of the specimens were analyzed under the seismic load.Also,some feasible connection modes were gained by comparing the response of infill walls.Finally,the calculation of earthquake of infill wall was held.The results showed that seismic responses of the infill walls whose connect with frame in form of flexibility and semi-flexibility modes are weaker than others obviously,and their integrality is better.Thus the conclusion could be drawn that out-of-plane stability of the specimens with connection modes of flexibility and semi-flexibility are better than those with the connection modes of filled with inclined bricks on the top and disconnection.The research results can provide evidence for establishing specifications and directing the construction and therefore help reduce the casualties and property loss caused by earthquake disasters.

Dynamic Responses of Block Type Quay Walls Under Cyclic Loading

The purpose of this research is to study the dynamic responses of gravity quay walls with block type consisting of“three blocks”experimentally.For this purpose,1g shaking table tests were conducted under different cyclic loadings for two different saturated granular backfill materials(Soil 1 and Soil 2).In this study,D_(n50) of Soil 1 and Soil 2 are selected as 2.2 cm and 1.0 cm,respectively.During the experiments,accelerations,soil pressures and displacements were measured for each block.Test results pointed out that Soil 2 caused more damage on structures.The measurements for displacement and tilting of each block were discussed in view of“acceptable level of damage in performance-based design”given in PIANC(2001).The result of the study showed that the definitions of damaged levels given in PIANC(2001)were reliable for using in performance-based methods for seismic design of block type quay walls.

Atrioventricular block complicating inferior acute myocardial infarction treated with thrombolytic therapy

Objective To investigate the influence and mechanism of incidence of atrioventricular block (AVB) treated with thrombolytic therapy in acute inferior myocardial infarction (AIMI).Methods A total of 46 patients with AIMI were divided into the thrombolytic group (n = 23) and the nonthrornboytic group (n = 23). Intravenous or intracoronary urokinase was given to the former group. We observed the advancing courses of AVB, and further assessed the relationship between occurrence of AVB and stenosis of infarct-related artery (IRA) with coronary angiography.Results Two cases died of Ⅲ o AVB in the non-thrombolytic group, but none was found in the thrombolytic group. The occurrence rate of AVB was similar in both groups; but that of Ⅲ ° AVB was much lower in the thrombolytic group (4 cases) than that in the non-thrombolytic group (11 cases, P ＜ 0.05), and the duration of AVB decreased from 201 ± 113 hours to 102±60 hours after thrombolytic therapy ( P＜0.01 ),which was mainly due to the decrease of AVB in the vanishing interval, but not in the developing interval.The coronary angiography demonstrated that there were an increasing reperfusion flow and a decreasing coronary stenosis of the infarct-related artery after thrombolytic therapy.Conclusion Thrombolytic therapy can reduce the incidence of severe AVB, shorten its duration and decrease the mortality by increasing the coronary reperfusion flow in the patients with AIMI.

A route to truly realize the chirality-specific growth of aligned carbon nanotubes

Single-walled carbon nanotubes（SWNTs）are regarded as one of the most promising candidates as building blocks in the next generation electronics.The most advanced opportunities demand the ability to form perfectly aligned,horizontal arrays of SWNTs with a uniform structure.However,synthesizing them by conventional chemical vapor deposition（CVD）methods would result in poorly-aligned nanotubes with a variety of chiral species,