But a series of studies in the 1990s ? including a famous analysis of fast - food restaurants in new jersey and pennsylvania by david card at berkeley and alan krueger of princeton university ? challenged that consensus , finding evidence that employment in fast - food restaurants actually rose after a minimum - wage hike 但是在上世纪90年代的一系列研究包括著名的由普林斯顿大学的戴维卡德和艾伦柯鲁艾格对新泽西跟宾西法尼亚的快餐店的分析，改变了这个看法，证明了最低工资提高之后快餐店的雇用率实际上有所上升。
In this dissertation , the research trends for the problem have been introduced ; the ‘ dim ’ and ‘ point ’ has been strictly defined in mathematics from machine vision and human vision ; the ideal clutter suppression system based on clutter predication and the realization and evaluation of evaluation index has been studied , in succession the clutter suppression technologies have been researched . firstly , the classic nonparametric algorithm has been analyzed in detail and systematically , for it ’ s weakness that it cannot remove the non - stationary clutter ideally , kalman filter algorithm for clutter suppression in 2d image signal has been built . secondly , fast adaptive kalman filter is presented based on fast wide - sense stationary areas partition algorithm : limited combination and division algorithm based on quarti - tree algorithm , new taxis filter route algorithm which can break through the limitation of the necessity of pixel neighborhood of 2d filter and laplace data model with two parameters which is perfectly suitable for the residual image of kalman clutter suppression 首先分析了经典的非参数法,对于四种具有代表性的核,从前述的三个性能评价方面做了分析和对比,指出了其速度快的优点和对非平稳图像适应性差的弱点,针对非参数法的弱点,重点研究了对非平稳图像适应良好的卡尔曼杂波抑制技术:建立了非平稳图像的类自回归模型,在此基础上建立了二维卡尔曼滤波基础的两个方程:状态方程和测量方程;建立了非平稳图像准平稳区域快速划分算法:基于四叉树法的有限分裂合并算法;二维空间的基于k排序的滤波路线算法,突破了空域滤波路线上区域相邻的限制;在这些研究的基础上实现了快速卡尔曼估计,实验验证了该方法相对逐点卡尔曼估计可以提高运算速度三倍左右;杂波抑制结果表明传统的高斯性检验并不适合卡尔曼估计后的残余图像,由此建立了残余图像的双参数拉普拉斯模型,实验表明其可以完好的吻合残余图像的概率密度曲线。
Then on january 19 , 2005 , to satisfy the urgent needs of the indigenous people as described by the local nec , a group of brothers and sisters stayed on two days longer than the other team members to deliver a chainsaw and an outboard motor to the integral development association of the indigenous bribr and cabecar communities and the indigenous emergency committee 1月19日，我们从国家急难委员会提供的讯息得知，原住民同胞仍急需其他物资，因此，一部分师兄和师姊又多停留了一两天，将电锯与舷外发动机运送到布里布里与卡维卡尔cabecar原住民社区整体发展协会，以及原住民急难委员会。
The various properties of composite resin and materials made out of it , such as dynamic mechanical property , thermal property , vicat softening temperature , rheological behavior , morphological structure and the broken profile of the materials , were determined and characterized with the aid of dma , ta - 2000 type thermal analyzer , xwb - 300f type detector of vicat softening temperature , capillary rheometer , tem , sem , respectively 通过dma 、 ta - 2000热分析仪、 xwb - 300f型维卡软化点温度测定仪、毛细管流变仪、 tem和sem等手段对聚丙烯酸酯caco _ 3 pvc复合树脂及其材料的动态力学性能、耐热稳定性、维卡软化点温度、流变性能、形态结构与材料的断面形貌等进行了测试和表征。
However , the pho - mmt speeded up the hc1 loss of pvc chains , and lower the thermal stability of the composites during the second stage of pvc thermal degradation . it was n ' t until the third and fourth stages of pvc thermal degradation that the pho - mmt began to improve the thermal stability of the composites . further more , the addition of pho - mmt have not apparently effect on the vsp of the composites 而pho - mmt却加大了pvc脱hcl的速度，降低了复合材料在pvc分解第二阶段的热稳定性，直至pvc分解的第三、第四阶段， ommt的加入才开始起到提高材料热稳定性作用，并且对材料维卡软化点的提高没有很大作用。
