Simulation result of the experiment shows that unloading and recovery process of PTCS is not consistent with the local stress redistribution and concentration.It can be divided into four phases:1.local stress unloads first in the middle of PTCS;2. stress continues to unload near the incident bar.3.Stress continues to unload near the transmission bar,the first and second layer PT buckling rumple disappear;4.the whole PTCS vibrates elastically.

對(duì)具體沖擊實(shí)驗(yàn)的數(shù)值模擬結(jié)果表明：相變柱殼的卸載恢復(fù)過(guò)程在柱殼結(jié)構(gòu)中是不均勻的，伴隨著殼體局部應(yīng)力釋放和局部應(yīng)力集中黄片一级无码在线嘿嘿，可以分為以下四個(gè)階段：1免费在线观看黄色网站大全www、柱殼中部發(fā)生彎曲變形的殼體應(yīng)力首先釋放，2人人妻人人干、靠近入射桿端的殼體應(yīng)力繼續(xù)釋放亚洲综合久久综合激情久久，3、靠近透射桿端的殼體應(yīng)力釋放人人插人人透人人射人人色人人干，第一層與第二層相變屈曲皺褶消失久久黄片不卡，4、柱殼整體彈性振動(dòng)国产一在线精品自产拍。

The smaller ones are ca 70 nm wide and join the tectum and the larger columellae. These larger ones appear to be composed of several 70 nm in width rods. They join the distal surface of the foot layer. The proximal surface of the foot layer is marked by a white line (referred to as a junction plane) where it joins the endexine.

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Said simple building comprises building body, roof and pool inside room; the lower building body is complete closed, the upper building body is provided with pillar on lower building body, and is circled with sun-shading net around pillar, the outside of sun-shading net is equipped with movable curtain; the roof is straw roof and has two sides along ridge; the pool inside the room comprises cultivation pool and laying-up basin, each cultivation pool is provide with a overflow bench, the bench surface is equipped with a cushion and the cushion is fixed on slope bench with a plurality of bracing column of same height, and a bamboo curtain is placed on the bracing column for young wood frog rest.

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The crystal structures have been determined by single-crystal X-ray diffraction.Cadmium atoms in compounds 1 and 2 show an eight-coordinated distorted square-antiprismatic geometry and a seven-coordinated distorted pentagonal bipyramidal geometryrespectively. Copper atoms in compounds 3 and 4 show a six-coordinated distorted threeprismatic geometry and a four-coordinated distorted tetrahedral geometry respectively.

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The fluid flows and heat coupled calculation method is used. The standards two equations turbulence models, velocity and pressure coupled arithmetic are used.According to the results of numerical simulation analysis the local coefficient distribution changes along the pin fins.Study the effection that its height and shape of the pin fins have on the average Nu and the average number of pressure loss coefficient Eu.The circle-shaped and elliptic-shaped pin fins have different circumcolumnar regional,therefore the mixed conditions are effected.

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With cross-shaped column as the representative of nonrectangnlar columns, one experimental program is conducted to study behavior of slab-column connection with nonrectangular column provided with shear reinforcement, the shear reinforcement include traditional stirrup and stud shear reinforcement .

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This paper studies the correlation between the maximum height s of the Plinian volcanic eruption columns and mass flux of the volcanic eruptions according to measurement data acquired from active volcanoes around the world.

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Previous studies indicate two possibilities of the formation of the greigite: 1 the seepage of seawater during the postglacial transgression provides sulfate and makes the reducing diagenetic conditions; 2 it may be precipitated as the authengenic mineral in marine or lacustrine sediments during the low sea-level stand of the Late Pleistocene.

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SUMMARY A more accurate steady drillstring tension-torque model has been established by taking into account of drillstring, wellbore condition , drilling operation and drilling parameters. This model has been used in scientific calculations of directional and horizontal wells, such as determing the friction factor between wellbore and drillstring, calculating the hook load and rotating torque, ckecking the strength and stability of drillstring, optimizing well trajectory, computing the WOB while drilling by downhole motor and predioting the maxinum allowable length of horizontal section.

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The piston pump has many kinds of structures; the variable displacement axial piston pump with a swash plate is a better kind among them and could best match the requirements of large flow, high pressure, and small volume. It also has a advantage of easily realizing the control of flow and pressure.

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