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The resuscitation team leader should consider the need for an emergency hysterotomy protocol as soon as a pregnant woman develops cardiac arrest.4,16–18 The best survival rate for infants ≥24 to 25 weeks in gestation occurs when the delivery of the infant occurs no more than 5 minutes after the mother's heart stops beating.16,19–21 This typically requires that the provider begin the hysterotomy about 4 minutes after cardiac arrest.

一旦孕妇发生心跳停止，复苏组领导应该考虑到是否有必要行急诊剖宫产[4，16–18]。孕24～25周以上婴儿最高存活率发生在对心跳停止不超过5分钟并施行分娩手术的的孕妇上[16，19–21]。这就要求医务人员在心跳停止4分钟就开始行剖宫产。

Firstly, This paper processes geometry filtration based on character of orbit's apogee and perigee after orbit model is analyzed and based. Secondly Space Debris is separated into two kinds, coplanar and not coplanar according as location interrelation of target and debris. In Dynamic filtration's processing, considering prediction time limit and orbit perturbation, secular effects which have increaser effect is considered so that some need catching danger time point is appeased, some law about time when target and debris pass intersectant line each other is inferred, when debris and object are in different plane and some similar law also is inferred otherwise. The time list is arithmetical progression. These laws can improve calculation efficiency remarkably; Lastly orbit predict is a course approaching least distance. Danger time point in the last step become beginning time point from which debris and object's position and velocity are calculated by SXP4 Model which is an analytic model.By result, determine that relative movement trend is closer or apart, farther calculate the interval apart from time when predictive least relative distance occurs. Least relative distance and time when least distance occurs is calculated finally. It is a fast approach course adopting varied interval.

本文在分析、建立轨道摄动计算模型的基础上，首先采用基于轨道远、近地点特征对大量编目在册的空间碎片进行初步几何静态筛选，然后根据碎片与目标轨道面的相对位置特点把碎片分为异面与准共面两种情况以进行动态筛选，在筛选过程中考虑到预报时限长度和轨道摄动影响，引入了轨道摄动中具有积累效应的长期项以满足危险时间点的捕捉要求，利用了长期项摄动变化线性的特点导出了碎片与目标异面情况下各自过交线的时间序列成准等差数列的规律性和准共面情况下类似的规律性，从而显著地提高了前期轨道筛选的计算效率；最后对剩余危险碎片和目标飞行器利用SXP4轨道预报模型在前期轨道筛选的基础上以各个危险探测时间点为预报的时间起点，并根据预报计算结果，分析目标和碎片在该时间点的运动趋势是相互远离还是相互接近，推出预计最小相对距离发生时刻相对此刻的时间长度，得到其随时间变化的局部最小相对距离以及危险距离发生的时刻和相对速度，这是一个采用变时间步长、快速逼近最小相对距离的过程。

Changes of erosion and accumulation of the seabed before and after the project The general characteristics of the pattern of erosion and accumulation of the seabed near the scheduled project both before and after the scheduled project are as the following: accumulation occurs at the areas lower than–10 isobath; some suspended sediment is deposited near the coast due to the relatively small tidal current with a monthly accumulation rate of 2-6 mm; while a slight erosion occurs in the areas deeper than–10 isobath with a monthly accumulation rate of .2 mm.

5工程前后海底冲淤变化工程前后海底冲淤相同的地方是：大致沿-10m等深线向近岸呈淤积状态，近岸由于潮流流速小，一些悬沙落淤，月淤积量在近岸附近约2-6mm；而-10m等深线以深基本上呈轻微冲刷状态，月冲刷量一般在0.2mm以下。

objective to investigate the paregoric effects of butorphanol when the errhysis occurs inside the epidural catheter during continuous epidural anesthesia.methods 60 cases of kidney stones received elective surgery.during this surgery they underwent continuous epidural anesthesia and eight cases of them showed the errhysis in the epidural catheter.then epidural injection of butorphanol was given for analgesia and hr,map,spo2 as well as muscle relaxation conditions were monitored before and 5,10,20 min after injection.the conscious and breathing of patients were also monitored.results before and 5,10,20 min after injection of butorphanol,hr and map difference were not statistically significant.the analgesic results were satisfactory.conclusion butorphanol has a definite analgesic effect when the errhysis occurs in epidural catheter during continuous epidural anesthesia.

目的 探讨在连续硬膜外麻醉中，硬膜外导管内渗血时，应用布托啡诺镇痛的效果。方法择期行肾结石手术患者60例，行连续硬膜外麻醉，其中8例硬膜外导管内渗血，均经硬膜外腔注入布托啡诺镇痛，分别监测注入前及注入后5 、10 、20 min，hr、map、spo2及肌肉松驰情况，同时监测患者神志及呼吸情况。结果注射布托啡诺前及注射后5、10、20 min，hr、map差异无统计学意义，镇痛效果满意。结论在连续硬膜外麻醉中硬膜外导管渗血时，注入布托啡诺维持麻醉镇痛效果明确。

Results show that amplitude of displacement excited by vertical incidence wave is larger than that excited by inclined incidence wave and not influenced greatly by the incidence angle. In vertical incidence, amplitudes of displacement of two points at the same altitude along each cavern are basically identical and maximum relative displacement occurs between top and bottom point of the cavern. While in the case of inclined incidence, displacement amplitude on sides meeting the wave is larger than that on leed sides, and maximum relative displacement occurs on left skewback and bottom of the cavern.

结果表明，位移幅值受入射角度的影响不敏感，竖直入射比斜入射情况要大；竖直入射时，各洞室两侧同一高程处的位移幅值基本相同，相对位移差最大部位为洞顶与洞底，而斜入射时迎波面比背波面一侧位移大，且相对位移差最大部位为洞室迎波面的左拱座与洞底。

The results show that spermatogenesis occurs during April through August and spermiogenesis occurs from July to August.

结果显示，北方山溪鲵在4~8月时处于精子发生期，精子形成在7~8月。

There are two kinds of spinels in a granulite terrain of Yushujgou, South Tianshan Mountain. One occurs in the intermediate and basic granulite units and is characterized by enriched Al and poor Cr, belonging to Al_spinel. In thin sections it shows dark green color and subhedral to anhedral form, and coexists with other metamorphic minerals, suggesting a neogenic metamorphic mineral of granulite facies. The other occurs in the adjacent ultramafic rock unit, belonging to Cr_spinel. In thin sections, it is dark brown in color and is scattered among olivine, clinopyroxene and orthopyroxene as irregular grains, indicating a stable residual mineral in the process of granulite facies metamorphism.

新疆榆树沟麻粒岩地体中发育两类尖晶石：一类见于中、基性麻粒岩体中，其化学成分富 Al贫 Cr ，属铝尖晶石，镜下为深绿色，呈半自形至他形粒状，与其它变质矿物共生，表现为麻粒岩相的新生变质矿物；另一类发育在空间上与麻粒岩体紧密相邻的超镁铁质岩体中，为铬尖晶石，镜下为深褐红色，呈不规则粒状分布于橄榄石、斜方辉石和单斜辉石之间，为麻粒岩相变质过程中稳定的残余矿物。

The aneurysmal bone cyst occurs most commonly in long bone or vertebral column and only 2% in jaws from reported cases. It occurs predominantly in mandible of young adult without significant sexual predilection. It also develops in rapid swelling and pain. Radiographic study shows well-demarcated, unilocular or multilocular radiolucent lesion.

动脉瘤性骨囊肿(aneurysmal bone cyst， ABC)则常发生於四肢骨及脊柱，颚骨的病例仅占了2%，下颚稍多，亦多发於年轻人，也无性别上之差异，通常为生长快速并造成患处疼痛或其他不适，放射线影像为周界清晰，单腔室或多腔室放射透过性之特性。

However, unlike the light source relative to the rest of the observer to see is the colorless astigmatism, and the light source relative motion of the observer to see is the red-shift light ( achromatous astigmatism occurs redshift of red-shift light ); Although the different inertial reference frame of the observer can see the speed of light, after the Lorentz transformation is the same as after c; but a different observer are exposed to the light energy is not the same achromatous (astigmatism energy and achromatous astigmatism occurs after the red-shift of red-shift of the light energy is out of the same ).

但是，与光源相对静止的观察者看到的是无色散光，而与光源相对运动的观察者看到的是红移光（无色散光发生红移后的红移光）；虽然，不同惯性参照系的观察者看到的光速，经过洛伦兹坐标变换后都一样为c；可是不同的观察者所承受到的光能量是不相同的（无色散光的能量和无色散光发生红移后的红移光能量是完全不相同的）。

A multivalent nonmetallic element of the nitrogen family that occurs commonly in inorganic phosphate rocks and as organic phosphates in all living cells; is highly reactive and occurs in several allotropic forms.

一种多价的氮族非金属元素，通常见于无机磷酸盐岩石中或作为有机磷酸盐存在于活细胞中，极其活跃，有多种同素异形体。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。