黑洞的高温喷流

从零曲面方程出发得出，匀加速直线运动的动态黑洞时空存在２个事件视界－黑洞视界和它的Ｒｉｎｄｌｅｒ视界。发现２个视界相接触时，接触点处的Ｈｗａｋｉｎｇ温度都降为零。而在黑洞视界的另一相反极点处的Ｈａｗｋｉｎｇ温度将迅速升高，并形成高温喷流。     

发电运行状态带式输送机驱动装置的位置确定

分析了煤矿采区上山采用下端驱动的带式输送机易发生输送带打滑和制动停车失控而造成堆料的原因,并提出了适合于井下生产的另一种安全可靠的下端驱动方式的带式输送机。     

匀加速直线运动的稳态Kerr黑洞的热性质

研究了匀加速直线运动的稳态Ｋｅｒｒ黑洞的热性质,发现它的Ｒｉｎｄｌｅｒ视界的Ｕｎｒｕｈ温度和它的事件视界的Ｈａｗｋｉｎｇ温度都不再是常数,而是θ的函数,得到了黑洞表面各点的温度。     

Investigation of scale inhibition mechanisms based on the effect of scale inhibitor on calcium carbonate crystal forms

To probe the scale inhibition mechanisms,calcium carbonate scale occurring before and after the ad- dition of scale inhibitors was collected.The results from scale SEM confirm that,without scale inhibitor, calcium carbonate scale shows rhombohedron and hexagon,which are the characteristic feathers of calcite.After addition of inhibitors,morphology of scale is changed,and the more efficient the scale inhibitor is,the more greatly the morphology is modified.To elucidate the scale constitute,they were further analyzed by FT-IR,XRD.Besides calcite,vaterite and aragonite occur in calcium carbonate scale after addition of inhibitors,and the higher scale inhibition efficiency is,the more vaterite presents in scale.It can be concluded that the alteration of morphology is ascribed to the change of crystal form. There are three stages in the crystallizing process including occurrence and disappearing of unstable phase,occurrence and disappearing of metastable phase,development of stable phase.Without scale inhibitors,metastable phases usually transform into stable phase,thus the main constitute of formed scale is calcite.When scale inhibitors are added,both formation and transformation of metastable phases are inhibited,which results in the occurrence of aragonite and vaterite.From the fact that more vaterite presents in scale with a more efficient scale inhibitor added,we can see that the function of scale inhibitor is realized mainly by controlling the crystallizing process at the second stage.     

Stability analysis of block boundary value methods for the neutral differential equation with many delays

This paper mainly deals with the asymptotic stability properties of block boundary value methods (B₂VMs) for the neutral differential equation with many delays. For the time lagging arguments, a technique of Lagrange interpolation is considered. Under some certain conditions, it is proved that B₂VMs can preserve the asymptotic stability of exact solutions for the neutral differential equation with many delays if and only if B₂VMs are A-stable for ordinary differential equation. Moreover, some numerical experiments are given to confirm the main conclusion.