微生物诱导碳酸钙沉积加固土体的注浆方法

为了探讨微生物诱导碳酸钙沉积(MICP)在实际工程中的应用方法,尝试注浆管MICP加固土体,即在土体中插入不同分布密度注浆孔的注浆管,将菌液和胶结液通过注浆管注入土体中,从而形成加固体,并通过对比试验,研究注浆管MICP的加固效果。试验结果表明,经过注浆管MICP处理,能形成完整的且强度较高的固化砂柱,并且固化砂柱的强度比较均匀。     

小样本多技术状态性能可靠性的仿真评估方法

针对大型产品性能试验的多技术状态、小样本特点,提出了基于环境因子仿真的性能可靠性评估方法。运用仿真技术获得了环境因子的仿真结果;利用环境因子将多技术状态下的试验数据折算为产品设计状态下的性能试验数据,基于折算后的性能试验数据得到了产品性能可靠性估计。最后,通过一个仿真实例说明了折算模型具有稳健性。     

指数型产品可靠性验收试验方案研究

在充分利用产品研制过程可靠性信息的基础上,利用多层贝叶斯方法给出了制定指数型产品可靠性验收试验的方法。该验收试验方案充分利用了产品定型试验中的先验信息,将产品在研制阶段的可靠性信息转换为批产品的可靠性信息,在确保较好验收效果的前提下,比传统的验收试验大大减少了试验时间,从而得到可观的经济效益     

Inhibitory Effect of Lithium Chloride on Mouse Thymocyte Apoptosis

This study investigates the effect of lithium chloride (LiCI) on mouse thymocyte apoptosis. A primary culture of mouse thymocytes was preincubated with LiCI (from 5 to 500μmol/L) before exposure to dexamethasone (DEX), the apoptosis inducer. With 100μmol/L of LiCI, apoptotic cell death induced by DEX was almost completely prevented as determined by flow cytometric analysis, terminal deoxynudeotidyltransferase (TdT)-mediated dUTP nick end labeling (TUNEL) assay and DNA laddering assay. The results show that the DEX-induced increment of caspase-3 activity in thymocytes is completelye liminated by LiCI preincubation. The results suggest that LiCI may protect Balb/c mouse thymocytes from apoptosis induced by glucocorticoid in a dose-dependent matter.     

Rigorous Axially Symmetric Consolidation Solution of Vacuum Combined Linear Loading Surcharge Preloading

Vacuum combined surcharge preloading is an effective method which has been used in ground treatment. This study presents the analytical solution of vertical drains with vacuum combined surcharge preloading. The surcharge was considered to be time-dependent preloading due to its reflection of the real situation.Moreover,the free strain,instead of equal strain hypothesis of the surface,was adopted for the mathematical rigor. Both vertical and horizontal drainages,along with the well resistance were considered.Besides,the time-dependent surcharge preloading was resolved with the impulse theorem which has been presented in the study,and the solutions for pore water pressure and degree of consolidation were derived by applying the approach of separation of variables.Furthermore,the solution is compared with previous solutions and numerical solutions,and the results verify the correctness of the proposed model.