非自治发展方程的收敛的逼近惯性流形族

本文讨论非自治无穷维动力系统的解的长时间行为·在谱间隙条件成立的情况下，对一类非自治发展方程，我们构造了一族收敛的逼近惯性流形·     

具无界值上半连续集值映射的拓扑度

设X和Y是Banach空间。用C(X)表示X中一切非空闭凸子产集所成之族。对于X中的点x与非空子集A和B,记,其中ε>0。 X×Y中的范数定义为。     

从一道光学习题得到的启示

从一道光学习题得到的启示山东建材学院逄锡森，范素华大学工科物理试题库中有这样一道光学题目：用波长为λ＝６００ｎｍ（１ｎｍ＝１０－９ｍ）的光垂直照射由两块玻璃平板构成的空气劈尖薄膜，劈尖角θ＝２×１０－４ｒａｄ．改变劈尖角，相邻两明条纹间距缩小△ι＝１...     

3D-QSAR Study on Apicidin Inhibit Histone Deacetylase

For Histone Deacetylase (HDAC) Inhibitor, four 3D-QSAR models for four types of different activities, were constructed.The cross-valldated q^2 value of CoMFA Model 1 is 0.624 and the noncross-validated r2 value is 0.939. The cross-validated q^2 value of Model 2 for training set is 0.652 and the noncross-validated r^2 value is 0.963. The cross-validated q^2 value for Model 3 is 0.713, with noncross-validated r^2 value 0.947. The crossvalidated q2 value for Model 4 is 0.566 with noncross-validated r^2 value 0.959. Their predicted abilities were validated by different test sets which did not include in training set. Then the relationship between substituents and activities was analyzed by using these models and the main influence elements in different positions (positions 8 and 14) were found. The polar donor electron group of position 8 could increase the activity of inhibition of HDAC, because it could form chelation with the catalytic Zn. Suitable bulk and positive groups at position 14 are favorable to anti-HDAC activity. These models could web interpret the relationship between inhibition activity and apicidin structure affording us important information for structurebased drug design.     

能与阴离子形成包结络合物的三环季铵盐

一般的络合剂只能络合阳离子,最近有人报导合成了一类笼状的三环季铵盐(1)、(2)、(3),它们具有络合阴离子的能力。     

一类共振半线性方程的广义度方法

关于半线性方程 Lu+N_(?)=z 已有很多讨论当 L 是零指标 Fredholm 算子时,Petry-shen 在[1]中建立了广义度理论、当 L 的核是无穷维时,也有一些讨论,如见[2].本文要对 L 有无穷维核的情形建立广义度理论。     

Quantum Theory of Electronic Double-Slit Diffraction

Phenomena of electron, neutron, atomic and molecular diffraction have been studied in many experiments, and these experiments have been explained by some theoretical works. We study electronic double-slit diffraction with a quantum mechanical approach and obtain the following results： （1） When the ratio of d ＋ a /a=n （n = 1,2, 3,...）, orders n, 2n, 3n,... are missing in diffraction pattern. （2） When the ratio of d＋a/a≠ n （n =1,2, 3,...）, there is a not missing order in diffraction pattern. （3） The slit thickness c has a large affect on the electronic diffraction pattern, which is a new quantum effect. We believe that all the predictions in our work can be tested by the electronic double slit diffraction experiment.     

相位互异散斑校正技术研究

相位互异散斑（PDS）是一种新颖的成像技术，可用来克服由于未知相差（如大气扰动）带来的图像退化。利用泽尼克多项式拟合未知扰动造成的相位失真，并用一对图像求得波前相位。从分析相位互异散斑技术的机理出发，使用遗传算法作为迭代算法，基于仿真实验数据验证了该技术的可行性，并在仿真实验中分析影响该技术性能的一些因素，如泽尼克多项式模式和湍流大小的影响等。这些研究结果为探索模糊图像恢复提供了新的途径。     

IVIM在移植肾排斥反应诊断中的应用

本研究探讨体素内不相干运动(IVIM)在移植肾排斥反应诊断中的应用价值。选取53例移植肾患者作为研究对象,根据病理结果分组,24例有急性排斥反应患者为排斥组,29例肾功能正常患者为非排斥组,分析排斥组和非排斥组IVIM参数差异。结果显示,排斥组肾皮质、肾髓质总体表观扩散系数(ADC_T)明显低于非排斥组(P<0.05);排斥组和非排斥组肾皮质、肾髓质单纯表观扩散系数(ADC_D)、伪灌注表观扩散系数(ADC_P)和伪扩散所占的容积分数(F_P)比较差异无统计学意义(P>0.05);细胞性排斥、体液性排斥、混合性排斥患者IVIM参数比较差异无统计学意义(P>0.05);肾皮质、肾髓质ADCT诊断移植肾患者发生急性排斥反应的ROC曲线下面积分别为0.793和0.889,P<0.05。IVIM扫描参数总体表观扩散系数在诊断移植肾排斥反应中有较好的应用价值。     

基于频分复用波长调制光谱的NO_2及NH_3浓度测量

基于中红外量子级联激光器(QCL)以及频分复用波长调制光谱技术,实现了NO_2及NH_3的高精度同时测量。对中心频率在1600.0cm~(-1)及1103.4cm~(-1)附近的两支QCL施加不同频率的正弦调制,利用数字锁相技术得到了测量信号在不同解调频率上的二次谐波信号。搭建了一套基于该技术的开放式空气中NO_2及NH_3的测量系统,多次反射池的光程为60m。利用25cm长的参考池进行浓度标定,发现系统在较大的浓度范围内具有优良的线性响应。两种气体的检测限均小于10~(-9)量级。使用系统进行了24h的气体监测,测量结果与参考仪器的结果吻合较好。