查询词典 unstable solution

Based on the elastic theory of large deflection and by taking into account the variation of the axial force and its effects on bending deformation of the drillstring in vertical section,the vibration of the drillstring induced by fluctuating weight-on-bit is described by a parametrically excited system.A Mathieu equation describing the system is established by Galerkin Method.By extending the solution into a Fourier series,the curves of dynamic bifurcation values and the dynamically unstable regions surrounded by the curves are presented.

基于弹性大变形理论，考虑到轴力沿钻柱轴线的变化及其对钻柱弯曲变形的影响等因素，将受自重作用的铅垂井段钻柱在波动钻压激励下的振动转化为一个参数激励系统，用Galerkin方法首次得到了描述此系统的Mathieu方程，并通过将方程的解展成富里叶级数的方法，得到了该振动系统的动力分岔值曲线及其所包围的动力不稳定区。

Through the comparison of energy, the asymmetric solution is stable while the symmetric one is revealed unstable.

通过变形发生分岔前后的能量比较发现，分岔后的对称变形是不稳定的，而非对称变形是稳定的。

Accord- ing to the observation that the compounds were stable in low pH aqueous solution and their sta- bility decreased when pH increased, and they rapidly decomposed to form α-methylenecyclopen- tanones derivative when pH reached 6 to 7, we postulated that the compounds were unabsorbable in stomack (where pH1-3) and unstable in small intestine (where pH5-8). The decomposed product was indeed inactive.

对Ⅰ类化合物在稀溶液中的稳定性研究表明，低pH时化合物较稳定，随着pH值的升高稳定性逐渐降低，pH6~7时，化合物迅速分解成α-亚甲基环戊酮类化合物，由此而推测Ⅰ类化合物经口给药无效的原因为：它们在强酸性的胃中（pH1-3）呈离子状态，因而不易吸收，经胃的排空运动进入肠道后，随着pH逐渐升高（pH5-8）化合物迅速分解，而分解产物α-亚甲基环戊酮类化合物证明是无效的。

An unstable acid known only in solution and as ''.

一种不稳定的酸，已知仅存在于溶液中或作为一种铬酸盐。

The curative solution to unstable HYSWAS has been presented and the relevant calculational results have proved its reliability.

对计算得出的运动稳定性不满足要求的HYSWAS，提出了相应的解决措施，并进行了定量的计算，证实了这些改进措施的可靠性

It is also found that the spurious dipoles are unstable in different inverse problem solution.

反之，目标函数可以得到极小优化，但出现多余的伪偶极子，且这些伪偶极子在多次不同条件的反演结果中，处于不稳定状态。

The existence of the bounded solution of unstable internal dynamics is the key to tracking reference trajectory stably.

研究表明，不稳定内部动态有界解的存在性是非最小相位系统能够稳定跟踪期望输出轨迹的关键。

Reconstruction problem is affected by noise that the solution is so unstable that other means is needed to resolve the three dimensional problem at many times.

重构问题由于受噪声影响出现解的不稳定性，致使很多时候不得不采用其他的方法来解决。

The alloy catalyst was found to be unstable in the acidic solution because of the electrochemical and chemical dissolution of the catalyst.

发现在酸性溶液中，钯铁合金催化剂对氧还原反应的催化活性不稳定，原因是钯铁合金催化剂在酸性溶液中发生电化学/化学溶解；在碱性溶液中，覆盖在电极表面的钯铁合金催化剂的质量及电化学活性面积在电化学扫描过程中不发生明显变化，保持对氧还原反应的催化活性，证明钯铁合金催化剂在碱性介质中非常稳定。

Upon irradiation with 4500±500lx strong light, JM216 was unstable in aqueous solution .

在光照下，JM216溶液稳定。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。