半寿命

The IRS2158D features include programmable preheat and run frequencies, programmable preheat time, closed-loop half-bridge ignition current regulation, programmable end-of-life protection, brownout protection and low input offset op amp.

IRS2158D的主要特性包括可编程的灯预热和运行频率，可编程的预热时间，闭环半桥点燃电流调整，可编程灯寿命终期保护，输入低电压保护和低输入失调的运算放大器。

The automobile half-shaft busing with direct forged inner hole has high strength and long service life .

直接锻造出内孔的汽车半轴套管强度高，寿命长，锻造工艺复杂。

In order to study the fatigue of pressure vessel commonly encountered problem in engineering with large destructibility , based on the theory of fracture mechanics , the pressure vessel existing original crack was equivalent to the problem of infinite flat with center crack .

为了分析工程中常见的破坏性极大的压力容器疲劳问题，基于断裂力学理论将存在初始裂纹的压力容器等效为无穷远处作用均匀拉应力的含中心裂纹无限大板问题，解出表面半椭圆裂纹和穿透裂纹的应力强度因子；利用断裂判据得到裂纹的临界断裂尺寸；采用Paris表达式对裂纹扩展速率进行描述，推导出初始裂纹在不同裂纹尺寸和形式下的裂纹疲劳扩展寿命。

The main results are as follows.1. The UV-visible absorption spectra, the spin-trapping EPR measurements, and the DPA (9,10-diphenylanthracene) bleaching experiments showed that (1) HB-Net exhibits much improved light harvesting efficiency in the phototherapeutic window (600-900 nm) as the result of its remarkable absorption red shift with respect to HB;(2) HB-Net remains the generation abilities of semiquinone anion radical, superoxide anion radical, hydroxyl radical, and singlet oxygen, but with much lower efficiencies than that of HB, most likely due to its very short triplet excited state lifetime.

设计合成了寡聚吡咯酰胺修饰的竹红菌乙素衍生物HB-Net，利用紫外-可见吸收光谱、自旋捕获技术和DPA光漂白法详尽比较了HB-Net与HB的光动力性质，发现：(1) HB-Net的吸收光谱较HB有显著红移，在光疗窗口的吸光能力明显提高；(2) HB-Net能够产生半醌负离子自由基、超氧负离子自由基、羟基自由基和单重态氧，但由于其短的三重态寿命，这些活性物种的产生能力均弱于HB.2。

The surface crack of the pontoon shell plate is simulated by using the ABAQUS program.

对于半潜式钻井平台浮箱，裂纹的扩展不仅影响结构的水密性甚至可能对结构的安全产生巨大威胁，并直接决定平台的整体使用寿命。

Primula tea flowers are individually foil sealed with a 2-1/2-year shelf life.

报春花茶叶花了两年半独立箔密封的货架寿命。

Compared with traditional metal, semimetal and carbon/carbon composite materials, C/SiC exhibits many outstanding advantages like low density, stable coefficient of friction, low wear, large brake ratio and long service life.

与传统的金属、半金属和碳／碳复合材料相比，C／SiC具有密度低、摩擦系数稳定、磨损量小、制动比大和使用寿命长等突出优点，在高速列车、汽车、飞机等领域具有广泛的应用前景。

Careful and detailed analyses were made on the causes for nonloading cracks in semirigid road pavements from the aspects of the subbase course,base course and bituminous surface course of a highway to discover the main factors causing these cracks.

本文通过从路面的底基层、基层和沥青路面三个方面对半刚性路面非荷载性裂缝产生的原因进行了细致分析，找出了裂缝产生的主要因素，并从设计和施工角度提出了一些减少裂缝、延长路面使用寿命的方法。

Pass to count to Wisterch parameter , and the steel wire is different from the molding tool get in touch with the length, and settle the path the research taking the length work the stabber angle to get under differently pull to stir the term, mold core adoption of best severally why size, combine the best work stabber of research the Cape, and settle the path to take the length nextly steel wire is in the molding tool of have fever to measure, air inside dispel-heat calories, winding dispel-heat on the coil-canister , and its molding tool dispel-heat calories of, and cause the steel wire the temperature difference pass in and outing the molding tool to influence steel wire machine function, under the experiment inside pull to stir the term according to the same race different work stabber Cape half of adoption the Cape(7 degree,10 degree,12 degrees, the best mold Cape, experience mold Cape) settle the path to take the length(2-3 mm,3-4 mm,4-5 mms, theories length, experience length) to proceed to experiment, and get the conclusion, work stabber the Cape then is more big the steel wire get in touch with the length with

通过对Wisterch参数，钢丝与模具接触长度、定径带长度、工作锥角度的研究得到了在不同拉拨条件下模芯采用的最佳几何尺寸，并研究最佳工作锥角、定径带长度下钢丝在模具中的发热量、空气中散热量、卷筒上的散热量及其模具散热量的不同，导致钢丝进出模具的温度差别对钢丝机械性能的影响，在实验中根据同种拉拨条件下采用不同工作锥角半角、定径带长度进行试验，得出结论，工作锥角越大则钢丝与模具接触长度越短，钢丝变形越剧烈，在模具中发热量就越高，导致钢丝出模温度高，使钢丝强度、硬度升高，弯曲、扭转次数降低，并且降低模具使用寿命。在其它条件相同的情况下，定径带越长则钢丝与定径带简壁磨擦增大，使钢丝发热量加大，从而使钢丝强度、硬度略升高，弯曲扭转次数略降低但定径带的增大减小了钢丝变形产生的弹性后效使钢丝出模直径比较稳定。

In this artical, the author reported a newly designed and manufactured extracorporeal shock wave lithotriptor, Its structure, function and clinical application were described, This is a kind of spark light dischange lithotrip-tot and may be employed without anesthesia and without immersion of pa-tients into the water, The electrodes can be used for a long period, First 30 patients of upper urolithiasis were healed with good results: stones all broken, no local subcutaneous ecchymosis, no uncomfortable feeli...

报道作者研制的体外震波碎石机的结构、性能和临床应用初步情况。该台碎石机属电极放电类型，但免除了水槽，电极寿命长，病人不用麻醉。临床首批治疗30例上尿路结石，结石均被粉碎，病员无痛苦不适，局部皮肤无灼伤、瘀血点，未见心电图异常改变，治疗后半小时至24小时开始排石。短期随访，12例于3天～30天内排尽结石，15例在继续排石中，3例肾盏结石排石量较少。取得了较满意的疗效。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。