不存在

The invention concerns a process for preparing heterocyclic carbenes of general formula in which R1, R2, R3 and R4 are identical or different and mean saturated or unsaturated, straight-chain, branched or cyclic, unsubstituted or substituted C1-C10 alkyl, C2-C5 alkylidene, C2-C5 alkylidine, C7-C19 aralkyl or C6-C14 alkyl groups, R3 and R4 can also stand for hydrogen or form jointly anellated, substituted or unsubstituted groups with between 3 and 7 carbon atoms and X stands for carbon or nitrogen, R3 being dropped if X is nitrogen.

本发明涉及一种制备通式Ⅰ的杂环碳烯的方法，其中在通式Ⅰ中，R1、R2、R3和R4是相同的或不同的，并且是饱和的或不饱和的，直链、支链或环状的，未取代或取代的C1－C10－烷基、C2－C5－亚烷基、C2－C5－次烷基、C7－C19－芳烷基或C6－C14－芳基基团，R3和R4可以是氢或它们一起形成具有3－7个碳原子的稠合的、取代或未取代的基团，X是碳或氮，并且当X是氮时，不存在R3。

The investigators concluded patients who have never walked are not at risk for spondylolisthesis because their spines are not subject to the same forces as those who ambulate.

作者认为：从未行走过的人不存在脊椎前移的风险，因为他们的脊柱受力和行走的人不一样。

But afore-mentioned case of illness are the fastest the 6 H after art is the slowest 20 H appears cannot sit quietly, companion breaks up to have quiver on eyeball, brothers Xu is moved, slant first, neck rigidity, flesh is clonic, present opisthotonos individually, but nonexistent pathology is reflexed (Ba Bin this base electronegative).

但上述病例最快术后6 h最慢20 h出现不能静坐，眼球上翻伴有震颤，手足徐动，偏头，颈强直，肌阵挛，个别呈现角弓反张，但不存在病理反射。

Hosius drew out the conciliar statements, to which anathemas were subjoined against those who should affirm that the Son once did not exist, or that before He was begotten He was not, or that He was made out of nothing, or that He was of a different substance or essence from the Father, or was created or changeable.

侯休斯拔出了conciliar报表，其中anathemas被subjoined对那些应该肯定地说，儿子一旦不存在，或者说，以前他是造物主，他不会，或者说，他是出于什么，或者说，他是一个不同物质或实质上来自父亲，还是创造或复杂多变。

By time-varying filtering, we realize the signal selectivity and interference suppression, especially for the signals with time-varying power spectrum. It is shown herein that conventional eigenstructure based methods are lower dimensional special case of the time-frequency subspace fitting method. The closed-form array response estimation algorithms for blind source separation in wireless communication is also developed in the dissertation by exploiting the data structure of second-order statistics of the array output in the presence of multipath. The proposed method achieves array response estimation with little constraint on signal property and propagation environment such as scatters or angular spread. Moreover, the array utilized here can be of arbitrary geometry and even uncalibrated. Since the closed-form solution is obtained, no misconvergency may occur and large amount of computation can be saved. The equivalent feed model and corresponding optimization designation are proposed to realize the downlink multi-user selective transmission. By coherent and non-coherent superposition of the electromagnetical field, multiple beams can be formed using a single array, so that each co-channel user signal is transmitted in each beam and will not interfered with each other. The proposed system scheme implements the digital beamforming and the channel allocation in the base band, therefore is suitable for the utilization of the radio software technology. The feasibility and effectiveness of the proposed model are proved by the RF experiment.

在窄带条件下，GSC－SSF方法还可以提高阵列的虚拟孔径，从而提高估计的性能；可以证明，Cyclic DOA 和SC-SSF方法可看作该方法的特例或近似； 3、提出了二维GSC－SSF方法和宽带谱相关DOA矩阵方法，利用信号的循环平稳特性解决了宽带条件下二维 DOA 估计问题，并具有阵元数少、计算量较小的特点； 4、提出了时频子空间拟合和宽带时频DOA估计算法，将联合时频分析的理论和方法引入到阵列信号的空间谱估计研究中，利用时变滤波实现信号选择性测向和干扰抑制，特别适合于谱时变信号；可以证明传统特征结构法可看作是时频子空间拟合方法的特例； 5、提出了多用户环境下阵列响应的估计方法——CARE方法，该方法对信号结构和传播参数（主要是散射源分布与角度散布）的约束较少，适用于各种几何结构的阵列甚至未校准的阵列，能够直接得到阵列响应的闭式解，因此计算量小、稳健性好，不存在收敛问题； 6、提出了针对多用户下行选择性发送的阵列等效激励模型、优化设计方法及其系统实现方案，通过空间场的相干叠加与非相干叠加使得单一阵列能够形成多个波束，并保证各波束内的用户信号各不相同且相互干扰最小；其系统方案具有在基带实现数字波束成形、信道分配并便于软件无线电实现的特点，其有效性已得到外场实测数据的证实。

When any impairment occurs, the barrier can no longer exist and may result in enterogenous infection and multiple system organ failure and the burn patient may be in a serious state.

结果：完整的胃肠粘膜屏障应包括胃肠道完整的解剖结构，正常的生物菌群和健全的免疫功能，一方受到损害，胃肠屏障即不存在，直接后果是肠源性感染和多脏器功能不全综合征的发生，烧伤旋即进入持续性危重状态。

Like occasionalism, it presupposes theism, and, unlike occasionalism, it entails either that free will does not exist or that free will is compatible with determinism. The theory called epiphenomenalism simply denies that the metal can affect the physical, and contents itself with an explanation of why the mental appears to affect the physical.

前定和谐论类似偶然论预设了有神论，不类似偶然论，它导出&或者自由意志是不存在的，或者自由意志和决定论相容&）被称为&副现象论&的理论简单拒绝了精神对物理的作用，满足于去解释为什么&精神会表现出对物理的作用&。

The experience of the ultimate is not an experience at all-----because the experiencer is lost.

对终极的体验完全不能被称为是一种体验，因为在终极的境界里那个体验者是不存在的。

The results were as follows: 1. Response of physiology indices of Medicago falcata L. to drought stress is different. There are not obvious correlation among indices and ability to drought resistance. The indices include critical water saturation deficiency, free and bound water content, tissue water, peroxidase isozyme, free proline content, chlorophyll a, chlorophyll b, total chlorophyll and chlorophyll. These indices are not fitting for assessing ability of drought resistance of Medicago falcata L..

黄花苜蓿各生理指标对干旱胁迫的响应不同，临界饱和亏、自由水含量、束缚水含量、组织水含量、过氧化物同工酶、游离脯氨酸含量、叶绿素a、叶绿素b、叶绿素总量以及叶绿素与黄花苜蓿抗旱能力之间不存在明显的相关性，不适宜采用这些指标来评价或判别黄花苜蓿材料间抗旱能力的强弱。

The characteristic of granular bed filter are wearable, geostatic and high temperature- resistant, its filtrate granule will not be eroded and sensitive to gas and dust.

颗粒层过滤器特点是具有良好的耐高温和耐高压性能，过滤介质不存在腐蚀问题，对气体和灰尘性质不敏感，过滤效率较高。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。