To meet the demands for large space and flexible compartmentation of buildings, laminated vierendeel trusses are adopted in high - position transfer story structures. first the bearing characteristics are analyzed, in which reasonable stiffness ratio of the upper chord, middle chord, and lower chord is derived. then combined with an actual engineering model ( 1 8 similar ratio ), the static loading and pseudo - dynamic tests of two models for laminated vierendeel truss used in transfer story structures are conducted, in which one model adopts reinforced concrete, and the other adopts prestressed concrete and shape steel concrete. seismic behaviors are analyzed, including inter - story displacement, base shear - displacement skeleton curves, and equivalent viscosity - damping curves. a program is programmed to carry out the elasto - plastic dynamic analysis, and displacement time - history curves of the two models are derived. the test and analysis results show that the laminated vierendeel truss with prestressed concrete and shape steel concrete has excellent seismic behaviors. it can solve the disadvantages of laminated vierendeel trusses used in transfer story structures. finally, some design suggestions are put forward, which can be referenced by similar engineering
為滿足建築物大空間和靈活隔斷要求,在高位轉換層結構中採用
迭層空腹桁架結構.首先分析了其受力性能,得出了空腹桁架各構件合理的截面剛度以及
布局形式.然後結合一實際工程,進行了兩榀
迭層空腹桁架轉換結構模型( 1 : 8相似比)的豎向荷載下靜力試驗以及擬動力試驗.其中一榀為普通混凝土
迭層空腹桁架,另一榀配置了預應力和鋼骨混凝土,對比分析了兩模型的層間位移比、骨架曲線以及等效粘質阻力系數等抗震性能的比較,並進行了彈塑性動力分析.試驗和分析結果表明,配置預應力和型鋼混凝土的
迭層空腹桁架轉換結構具有良好的抗震性能,可以成功地解決
迭層空腹桁架作為轉換層結構所產生的弊端問題,最後對這類轉換層結構提出了相應的設計建議
Explicit iterated integral formulae of the moments in various order of the hitting times of geodesic spheres by brownian motions on rotationally symmetric manifolds are given in this paper
摘要主要給出了旋轉對稱流形上
布朗運動關于測地球面的首中時、球殼的首出時的各階矩的
迭代積分公式。
Firefighters are battling massive blazes in malibu and around san diego
消防隊員們正在馬裡
布和聖
迭戈附近與大火進行戰斗。
The unknown source strength of cavitation is always arranged on the propeller blade surface in the solving process, but the integration is carried out along the cavity surface of last iterative step when the strength of cavitation dipole is determined according to dynamic condition
求解過程中待求的空泡源強始終
布置在槳葉表面上,而在根據動力學條件求解每一步的空泡麵元偶極子強度時,積分是沿著上一步
迭代確定的空泡表面進行的。
In fact, every circle of its process is a simplified waterfall model
事實上它的每一次
迭代都是一個簡化了的瀑
布模型的開發過程。
Variations of the waterfall model loosen the rules a bit, allowing some overlap of the steps and the ability to back up one step if necessary
某些「瀑
布模型」的變種放寬了這一原則,允許步驟間的交
迭,如果需要的話還可以返回到上一步。
More and more software organizations are moving away from the waterfall model of the life cycle to an iterative approach
越來越多的軟體組織開始從瀑
布式模型向
迭代式模型轉變。
The following graph demonstrates the current development environment, using any of the waterfall, spiral or iterative processes
下面的圖片使用瀑
布式方法、螺旋型方法或
迭代過程中的任何一種方法來描述當前開發環境。
Each iteration consists of all of the standard waterfall phases, but each iteration only addresses one set of parsed functionality
每個
迭代過程包含所有的標準瀑
布式階段,但每個
迭代過程只處理解析過的功能的一個子集。
Figure 4 : risk reduction profiles for waterfall and iterative development projects
圖4 :瀑
布和
迭代開發項目的風險消減一覽圖。
The surface panel method has been applied to predict the hydrodynamic performance of highly skewed propeller. the surface of propeller and its trailing vortex are discreted by a number of small hyperboloidal quadrilateral panels with constant source and doublet distribution. for highly skewed propeller, the conventional method generating grid oriented along constant radii will result in a high aspect ratio and a high skewness and a twist panel near the propeller tip on blade surface, which result easily in incorrect calculation results of velovity on blade surface, even in iteration divergence and calculation failure. a “ non - conventional grid ” is developed to acoid these problems. this grid can effectively solve the problem of the calculation and convergence for highly skewed propeller. the non - linear kutta condition of equal pressure on upper and lower at the trailing edge is executed by the iterative procedure. by sample calculating, the obtained results are satisfied the experimental data
採用面元法預報大側斜螺旋槳水動力性能,螺旋槳表面及尾渦面離散為四邊形雙曲面元,每個面元上
布置等強度源匯和偶極子分佈.對于大側斜螺旋槳而言,槳葉表面採用常規的等半徑網格劃分方法在近葉梢處將導致大展弦比、大側斜和扭曲面元,這容易使槳葉表面速度的計算結果不正確,甚至會導致
迭代過程發散及計算失敗.文中建立了一種「非常規網格」劃分方法,能有效地解決大側斜螺旋槳的計算和收斂問題.槳葉隨邊處通過
迭代實現非線性等壓庫塔條件
It s often the last iteration that presents teams with the most conflicts and time constraints, given that it s overlapping with both the previous release maintenance cycle, this current release s maintenance cycle, and the next release design cycle
通常是在最有一次
迭代中表現了團隊最多的沖突和時間限制,假設它的重疊包括以前的發
布維護周期、目前的發
布維護周期和下一個發
布設計周期。
Master at work : karen, a female orangutan, at the san diego zoo, grabs a paintbrush, contemplates the canvas and then using her hands, feet and face, begins creating her masterpiece
聖
迭哥動物園的一隻雌性猩猩卡倫正手執畫筆聚精會神的在畫
布上做畫。
Focusing on the problem of sound field of scattering due to the existence of tubes, the general mathematical model modeled according the condition of plant, and then the coefficient of sound scattering is resolved by using the method of inverse matrix, the functions of arbitrary configuration of tubes is got, the far field scattered pressure and near field scattered intensity of the unit of heat exchanger tubes is calculated, at last, the effect of soot cleaning due to the existence is analyzed
論文根據爐內管束的實際情況,建立換熱器管束聲波散射的通用數學模型,利用
迭加原理法求解模型中的待定散射作用系數,得出任意
布置管束的散射聲場特性,並具體計算鍋爐換熱器管束單元聲波散射遠場聲壓分佈和近場壁面的聲強分佈,最後分析由於聲波的多重散射作用而對聲波吹灰的影響。
Influences on the hitting probability by error of carrier, by dispersion of sub - projectiles, by size of target, by the numbers of sub - projectiles, and by the range of fire are analyzed
分析了母彈的射擊誤差、子彈的散
布誤差、目標幅員、重
迭度、子彈攜帶量及射距離對子母彈首發命中概率的影響。
In this paper, the general structure of block cipher together with its related properties is firstly discussed, then the main non - linear component of s - boxes in block cipher is analyzed. as to the boolean function in binary field, we studied its non - linearity, linearity structure, output bit independence criterion ( big ), balance, completeness, strict avalanche criterion, propagation criterion, correlation immunity, linear approximation table and xor distribution table. we also discussed the pile - up lama used to compute the combination linear probability and showed an instance of its application
本文首先討論了分組密碼的一般結構及其相關特性,此外還有分組密碼主要的非線性組成部分s盒。對於二元域上的布爾函數主要討論了其非線性性、線性結構、比特獨立準則、平衡性、完整性、雪崩準則、傳播準則、相關免疫性、線性分佈表及異或分佈表等特性。對計算組合線性概率的迭加定理我們也進行了具體的討論,並給出了運用事例。