未知

In the case that there is no a priori knowledge of the upper bound and lower bound of the unknown parameters, the switching adaptive control design approach is presented.

在非线性系统中未知参数的边界值未知的情况下，提出了切换自适应控制设计方法。

The characteristic approximation is used to handle the convection part along the direc-tion of fluid namely characteristic direction to ensure the high stability of the method in approximating the sharp fronts and reduce the numerical diffusion; The mixed finite element spatial approximation is employed to deal with diffusion part and approximate the scalar unknown and the adjoint vector function optimally and simultaneously; In order to preserve the integral conservation of the method, we introduce the modified characteristic method.

该方法对方程的对流部分沿流体流动的方向即特征方向离散以保证格式在流动的锋线前沿逼近的高稳定性，消除数值弥散现象；对方程的扩散部分采用最低次混合有限元方法离散、同时以高精度逼近未知函数及未知函数的梯度；为保证方法的整体守恒性，在格式中引入修正项。

Put the discrete algebraic equations of initial derivative conditions and algebraic equation system of governing differential equation together to form a new algebraic system.

采用重心Lagrange插值近似未知函数，推导了未知函数各阶导数微分矩阵的显式表达式，建立了求解二阶常微分方程初值问题的重心Lagrange插值配点法。

Carthlicum, and was located on region of wheat chromosome 2AL near the gene Pm4b, it maybe either Pm4b, or a new gene linked to Pm4b. Temporarily, the gene was designated as PmPS5A. A dominant major gene conferring resistance to powdery mildew was identified in a BC〓F〓 population derived from a cross of amphidiploid Am9 and wheat cv. Laizhou953. The gene originated from T.

通过与含有已知抗病基因品种或品系的对该20个菌株反应模式比较和系谱分析，推测Am9／莱州953*〓 F〓含有Pm4b，波斯小麦PS5含有Pm4b与一个未知抗病基因组合；（DR147／Ae14）／／莱州953*〓 F〓和硬粒小麦DR147含有Pm4a和一个未知抗病基因组合；尾状山羊草Ae14和小伞山羊草Y39含有新的抗白粉病基因。

Combined Nussbaum gain with the backstepping techniques, a novel algorithm was proposed by employing fuzzy systems as approximator of those unknown nonlinearities in the system.

将ISS理论引入所研究系统，利用模糊系统逼近系统中的未知非线性；利用Nussbaum增益技术解决系统中的控制方向未知的高频控制增益，提出了一种基于反推设计方法的鲁棒自适应模糊控制算法。

The methods of autonomously tracking and rebuilding of unknown environment with force sensor of robot is proposed, too.

并通过重构未知环境几何模型，使机器人具有感知未知环境信息并实时修改环境模型的能力，提高了机器人的智能性和自主性。

The unknown is greater than the known; the known is but as a barque on the ocean of the unknown.

未知比已知广大得多。已知只是未知海洋上的小帆船。

Then struggles is coming a secondary to die, dares to seek unknown and the challenge unknown always compared to dreads unknown with sinks confuses unknown, wants many several to divide nimble and resourceful and heroical!

那么就挣扎着来一次生死吧，敢于探求未知和挑战未知总比畏惧未知与沉迷未知，要多几分灵动和壮烈吧！

The driving force that the astronomy develops, has been it is people to make cautious inquiries about to unknown object's in that boundless firmament , I have been looking up at that skyful array of stars always with sacred state of mind , there has been full of infinite profound mystery , it has been calling up people arousing our impulsion to the unknown world exploration to far boundless the unknown world thought.

天文学发展的动力，就是人们对那无边的苍穹中的未知事物的探询，我总是以神圣的心情仰望着那满天繁星，那里充满了无穷的奥秘，它唤起人们对未知世界的无限遐思，激发我们对未知世界的探索的冲动。。。。。。。

Through transposition and transmission of reachability ,it is used to eliminate unknown relations using of reachability and reachless relations from initial matrix and using of interactive method.

这种方法从初始可达阵开始，利用可达关系的传递性，经过一系列的变换，消除一部分未知关系，再利用不可达关系，进一步消除一部分未知关系，最后采用人机交互的办法消除剩余的未知关系，从而得到利用可达矩阵表示的系统结构模型。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。