X探长破案记

前言:X探长是Y小镇上声名远扬的破案高手。他每天奔波在小镇的大街小巷,各种奇案都难不倒他。瞧,X探长又要出发去破案了!01失窃的钻石“丁零零……”急促的电话声响起,X探长拿起电话:“喂!什么事?”“你是X探长吗?我是商业大街88号珠宝店经理,我这里发生了抢劫案!”“好的,保护好现场,我马上就到!”X探长放下电话,立刻驾车赶往商业大街。     

Experimental Study of Structure Shock Vibration in Soil Caused by Explosion of Conventional Weapons

When hitting underground structures directly or exploding in rock-soil media near underground structures, the conventional weapons with large charge weight will make underground structures be subjected to strong shock vibration and cause personal casualty and damage of precision electronic equipments. The shock vibration has become one of the cardinal killing means of weapons. However, the existing methods of predicting structure shock vibration are limited evidently. In this paper the coupling coefficient of acceleration in clayey soil is obtained firstly. Subsequently based on repeated experiments of chemical explosion, after dimension analysis and by using method of multivariate stepwise regression, the calculation formulae of shock vibration acceleration for the underground structure are obtained finally. The formulae consider top and side explosion respectively, taking into account the effects of penetration depth, charge weight, distance to explosion center, rock-soil media, size of structure and buried depth. They are easy to use with high practicability and degree of confidence, and can provide credible evidence for prediction of shock vibration and vibration isolating design of underground structure.     

风倒木的贡献

美国华盛顿州位于太平洋东海岸, 该州的奥林匹克半岛分布有茂密的森林,是世界上著名的温带雨林区之一。这里冬暖夏凉,气候宜人。在湿润的太平洋西风盛行的季节,饱含水蒸气的气流吹来,遇到大山阻挡,在高处冷凝成水滴后倾盆而下,为这里的大片森林注入了源源不断的水分,使大片大片的森林郁郁葱葱,其中包括锡特卡云杉、道格拉斯冷杉、大叶槭树、铁杉、西部红松等。     

Modeling Strain Rate Effect for Heterogeneous Brittle Materials

Rocks are heterogeneous from the point of microstructure which is of significance to their dynamic failure behavior. Both the compressive and tensile strength of rock-like materials is regarded different from the static strength. The present study adopts smoothed particle hydrodynamics (SPH) which is a virtual particle based meshfree method to investigate strain rate effect for heterogeneous brittle materials. The SPH method is capable of simulating rock fracture, free of the mesh constraint of the traditional FEM and FDM models. A pressure dependent J-H constitutive model involving heterogeneity is employed in the numerical modeling. The results show the compressive strength increases with the increase of strain rate as well as the tensile strength, which is important to the engineering design.     

Numerical Simulation of Response of SRC Columns Subjected to Blast Loading

The dynamic characteristics and failure modes of steel reinforced concrete (SRC) columns subjected to blast loading are complicated because of the transient stress wave in the SRC columns and the interaction between steel and concrete. This paper presents a numerical simulation of the response of SRC columns subjected to blast loading using hydrocode LS-DYNA. In the numerical model, a sophisticate concrete material model (the Concrete Damage Model) is employed with consideration of the strain rate effect and the damage accumulation. An erosion technique is adopted to model the spalling process of concrete. The possible failure modes of SRC columns are evaluated. It is observed that the failure of SRC columns subjected to blast load can generally be classified into three modes, namely, a direct failure in concrete body due to the stress wave, a transverse shear failure near the support sections due to the high shear force, and a flexural failure pertaining to large local and global deformation of the reinforcing steel.     

The Reflection of Cultural Differences in a Joint Performance

Cultureisoneofthemostdifficulttermstobewelldefined.NewWebstersDictionarysaysitisnotonly"theacquiredabilityofanindividualorapeopletorecognizeandappreciategenerallyacceptedestheticandintellectualachievementofcivilizationoraparticularstageorstagesofcivilizationasinthecaseofacertainnationorperiod"butalso"thetotalofhumanbehaviorpatternsandtechnologycommunicatedfromgene-rationtogeneration".Thelatterisananthropologicalandsociologicaldefinition,whichagreeswithLongmanModernEnglishDictionary'sthirddef…     

Equivalent Kelvin Impact Model for Seismic Pounding Analysis of Bridges

Based on Hertz contact theory, a method to determine the parameters of Kelvin impact model for seismic pounding analysis of bridges is proposed. The impact stiffness of Kelvin model is determined by the ratio of maximum impact force to maximum contact deformation, which is calculated based on Hertz contact theory with considering the vibration effect. The restitution coefficient which has great influence on the damping coefficient of Kelvin impact model is investigated by numerical analysis. Numerical results indicate that the impact stiffness of Kelvin impact model increases with the increment of the Hertz contact stiffness, approaching velocity or the length ratio of short to long girders. Vibration effect has remarkable influence on the impact stiffness and cannot be neglected. The restitution coefficient decreases when approaching velocity increases or the length ratio of short girder to long girder decreasing. The practical ranges of impact stiffness and restitution coefficient are obtained as 3×108-6×108 N/m and 0.6-0.95 respectively.     

暖雨

进入二月,下起暖雨来了。这是一个阴霾的日子。空中低浮着灰色的云。打下午起,就下了雨,使人骤然感到一股复苏的暖意。这样的雨,不接连下上几场,是难以治愈我们对春天无比饥渴的强烈感情的。天上烟雨空濛,我看到行人们打着伞,湿漉漉的马儿从眼前走过。连     

格林柯尔系挑战海尔神话--冰箱业资产重组搅动竞争格局

我们关注的是2001年格林柯尔收购科龙以及其在2003年收购美菱的事件及其影响，运用部分财务数据以及图表进行比较分析，说明整合后的格林柯尔系作为冰箱行业的后起之秀如何与该行业领军人海尔竞争，成为海尔在冰箱产业最强大的对手，并根据相关分析对冰箱产业的未来格局进行了预测。     

ON THE REE ACROSS THE PERMIANTRIASSIC BOUNDARY IN SOUTH CHINA

This paper discusses the INAA results of REE in clays atand near some Permian/Triassic boundaries of South China.It showsthat the REE patterns of boundary clays differ from those of non-boundary clays.One difference is that the boundary clays are moreenriched in LREE,with steeper slope of REE and a smaller Eu nega-tive anomaly than the non-boundary clays.Another difference is that theboundary clays show a small Ce negative anomaly,but no Ce anomalyoccurs in the non-boundary clays.From these REE patterns and some other experimental facts,it isproposed that the P/T boundary clay may be a mixed product consistingof the acidic-intermediate ash and the upper crust substance representingsputtering component,and the calculated fraction of the former andlatter is 7/3.