不确定性

By presupposing the system uncertainties satisfying certain matching conditions, a sliding-mode switching manifold and a SMC law are proposed, which are invariable to the structural uncertainties and possess the parameters without stochastic noise. Then, the accessibility of the sliding mode and the stability of the closed-loop system are analyzed, and some necessary conditions are further obtained to select the parameters for the SMC law.

在系统的不确定性满足一定匹配条件的情况下，构造了对不确定性具有不变性以及参数不含噪声激励的滑模切换流形和变结构滑模控制律，分析和证明了滑模的可达性和闭环系统的稳定性，并给出了滑模控制律的参数选择条件。

At the same time, in order to analysis some indeterminacy of structure for example physics and geometric parameter, constraint conditions, stochastic wavelet FEM is proponed. Those methods make the applications of wavelet in structure engineering become more extensive.

同时，为了分析由于结构的物理、几何参数和约束条件等不确定性而引发的工程结构性能的不确定性，提出了随机小波有限元法，从而使小波在结构工程中的应用更加全面。

It has many uncertainties in science, politics and economy.

它本身不仅具有相当多的科学上的不确定性，还具有相当多的政治上和经济上的不确定性。

The following factors, among others, could cause actual results and future events to differ materially from those set forth or contemplated in the forward-looking statements: defaults on or non-renewal of leases by tenants or renewal at lower-than-expected rent or failure to lease at all or on favorable terms, decreases in real estate values and impairment losses, increased interest rates and operating costs or greater-than-expected capital expenditures, our failure to obtain, renew or extend necessary financing, re-financing risks, risks related to our obligations in the event of certain defaults under co-investment ventures and other debt, risks related to debt and equity security financings, difficulties in identifying properties to acquire and in effecting acquisitions, our failure to successfully integrate acquired properties and operations, our failure to divest properties we have contracted to sell or to timely reinvest proceeds from any divestitures, our failure to contribute properties to our co-investment ventures, risks and uncertainties affecting property development, value-added conversions, redevelopment and construction (including construction delays, cost overruns, our inability to obtain necessary permits and public opposition to these activities), our failure to qualify and maintain our status as a real estate investment trust, risks related to our tax structuring, failure to maintain our current credit agency ratings or to comply with our debt covenants, environmental uncertainties, risks related to natural disasters, financial market fluctuations, changes in general economic conditions, global trade or in the real estate sector, inflation risks, changes in real estate and zoning laws, a continued or prolonged downturn in the U.S., California or global economy, risks related to doing business internationally and global expansion, risks of opening offices globally, risks of changing personnel and roles, losses in excess of our insurance coverage, unknown liabilities acquired in connection with acquired properties or otherwise and increases in real property tax rates.

以下因素可能会导致实际结果和未来事件与前瞻性陈述产生重大出入：承租人拖欠租金或者不续租；利率以及经营成本的提高；我们未能获得必要的外部融资；再融资的风险；与合资项目和其它债务发生特定违约时我方承担的义务有关的风险；与债务和股权融资有关的风险；确定拟收购的物业以及完成收购过程中遇到的困难；我们未能成功整合收购的物业和业务；我们未能剥离已经签约出售的物业或未能及时将剥离带来的收益再投资；影响物业开发和建设的风险和不确定性（包括建设延期、费用超支、我们无法获得项目建设所需的必要批准以及公众对项目开发建设的反对等）；我们无法获得或者维持作为房地产投资信托公司的资质；与我们的税收策划有关的风险；无法保持我们目前的信用评级；环保方面的不确定性；与自然灾害有关的风险；金融市场的波动；整体经济状况或者房地产业的变化；房地产和城市规划法律的调整；美国、加利福尼亚州或者全球经济的衰退；与开展国际业务和全球扩张有关的风险；保险范围之外的损失；与被收购的物业有关的或者其它未知责任以及房地产税率的提高等。我们的成功还依赖于总体经济走向，包括利率、所得税法、政府监管、立法、人口总数变化以及我们在10-K表中作的截至2009年12月31日的季度报告中&风险因素&和其它标题项下阐述的其它问题。

At the same time, it's very hard directly to obtain useful information on the major uncertainties of going-concern ability by the users.

而注册会计师出具的审计报告未能充分反映出企业存在的持续经营重大不确定性问题，从审计意见中也未能看出企业是否存在持续经营重大不确定性问题。

Thus, the paper perfects the 2D linear segment uncertainty ε(subscript σ) model in theory and makes it more scientific, and also provides a new way to study the space data uncertainty in GIS.

本研究完善了2维线元不确定性ε模型，使其更具有严密性，同时为GIS空间数据不确定性的研究提供了新的方法。

From the Maxwells equations in integral form directly, the Maxwell Grid Equations are derived through discretization of the solution space and the equations, and thereout the common equation of arbitary structures. Secondly, the solution uncertainty of a common electro-magnetic equation is proved and a strategy is advised to get the unique solution of the finite integration equation.

直接从积分形式麦克斯韦方程组出发，通过空间离散与方程离散得到麦克斯韦网格方程组，由此得到任意结构的一般方程；深入分析了麦克斯韦网格方程组的代数特性，论证了其解的不确定性，并指出了一种可避免解不确定性的措施。

A nonlinear adaptive speed controller based on adaptive backstepping approach for permanent magnet synchronous motors with nonlinear coupling and parameter uncertainties is presented. With the preposed controller, the parameter uncertainties are compensated and high performance speed controller for permanent magnet synchronous motors is shown to be globally asymptotically stable. The scheme is robust to the parameter uncertainties and load torque disturbance.

针对永磁同步电动机系统的非线性耦合特性以及参数的不确定性，采用自适应反步控制实现永磁同步电动机的非线性控制，在补偿参数不确定性影响，提高系统的抗干扰能力的同时，实现了永磁同步电动机的高性能全局渐近稳定速度跟踪控制。

The authors view is oppos...

笔者的看法与此相反，笔者认为线元上两控制点之间的点的位置不确定性应大于控制点的位置不确定性，且在两控制点的中间达到最大，即线元误差带的基本形状应为&纺锤形&而不是&哑铃形&。

The uncertainty of the parameters may induce uncertainty calculation of water head and velocity of flow, and influence the reliability of the results of groundwater resources appraising.

参数的不确定性将导致计算的水头、流速的不确定性，并影响到地下水资源评价结果的可靠性。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。