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Based on the fictitious crack model and critical crack tip opening displacement CTODc, the precritical crack propagation length △ac of concrete was determined by means of three point bending beams. According to the calculation value of △ac, the effective fracture toughness KunIc of concrete was evaluated.

本文采用虚拟裂缝模型，将临界裂缝尖端张开位移CTODc作为控制参数，利用三点弯曲梁试件通过迭代求得了混凝土裂缝亚临界扩展量的临界值△ac，据此求得了混凝土起裂断裂韧度KiniIc、等效断裂韧度KunIc值。

The techniques for prefabrication and assembling of short box-beams based on the geometric control method are still in the beginning stage in our country.

基于几何控制法的箱梁短线预制拼装技术，在我国尚处于起步阶段。

Love's Fidelity Set me whereas the sun doth parch the green, Or where his beams do not dissolve the ice: In temperate heat, where he is felt and seen; In presence prest of people mad or wise; Set me in high, or yet in degree; In longest night, or in the shortest day; In clearest sky, or where the clouds thickest be; In lusty youth, or when my hairs are grey: Set me in heaven, in earth, or else in hell, In hill or dale, or in the foaming flood; Thrall, or at large, alive whereso I dwell, Sick or in health, in evil frame or good, Hers will I be; and only with this thought Content myself although my chance be nought.

爱的忠诚不论我在南方冒着赤日炎炎，或在阳光无力融化冰雪之处，或在阳光和煦的温暖国土，不论与狂人为伍或在哲人之间，不论我身份是高贵或是低贱，不论是长夜漫漫或白昼短促，不论是晴空如洗或乌云密布，不论是年华正茂或双鬓斑斑；不论我在人间，地狱或天堂，在滔滔洪水中，或在高山深谷，不论患病或健康，快乐或忧伤，不论住在何处，自由或为奴，我永属于她；哪怕我的希望永成泡影，这念头已令我满足。

Influence of various parameters including ratio of nonprestressed reinforcement, ratio of unbonded prestressing tendon, span-depth ratio, effective prestress, cylindrically compressive strength of concrete, ultimate tensive strength of prestressing tendon, yield strength of nonprestressed reinforcement and loading pattern on the behavior of unbonded prestressed concrete beams and the ultimate stress in tendon, f_, are investigated in detail. Parameters having important influence on second-order effects of externally prest

本文设计了8个系列共76根体内无粘结预应力梁，以及2个系列共21根体外预应力梁和3根体内无粘结预应力对比梁，利用提出的有限元模型对这些梁进行非线性全过程分析，详细研究了各种参数诸如非预应力筋配筋率、无粘结预应

It is shown that the atmosphere turbulence slows the downtrend of the twist parameter,gives rise the peak value of wave front curvature in the principal direction,degrades beam′s coherence and increases the spreading of beams.

根据有扭曲的各向导性高斯-谢尔模型光束在大气湍流中传播距离z处的部分相干复曲率张量给出了光束参量的表达式和详细的数值计算结果。

A specially designed prismoid that generates interference of four beams with binary symmetry is fabricated and optical interference field is observed with an optical microscope.

实验上用光学显微镜拍摄了双模结构的光场分布。

Rather, it is a way of projecting beams of light wherever they are needed.

其实，全息投影是指一种将光束投影到任何需要的地方的方法。

Then, a subsidiary of the frame structure (including PURLIN of the wall beams and columns, such as wind) design.

然后，进行了刚架附属结构（包括檩条、墙梁、抗风柱等）的设计。

Qi Niandian Wugufengdeng prayer is the emperor of the premises, is a three Zhongyan Basilica of the round, 38 meters high, 32.72 meters in diameter, blue glazed tile roof, brick-wide, not long PURLIN beams, depends entirely on 28 and 36 pins Fang Jue support, in the form of construction on a high artistic value.

祈年殿是皇帝祈祷五谷丰登的场所，是一座三重檐的圆形大殿，高38米，直径32.72米，蓝色琉璃瓦顶，全砖木结构，没有大梁长檩，全靠28根木柱和36根枋桷支撑，在建筑的造型上具有极高的艺术价值。

Then,the vibration of the model is calculated by using the FEM. Comparing the level of vibration with different multilevel quadrate steel beams,the effects and rules of isolating vibration are tested.

然后用有限元软件模拟计算了加多级方钢隔振后的结构振动水平，通过比较分析，得到了多级方钢的隔振效果和振动能量在其间的传播规律。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。