复方氨基比林注射液的双波长薄层扫描分析研究

以苯-丙酮(4:1,V/V)为展开剂,在薄层硅胶板上将复方氨基比林注射液中的氨基比林和巴比妥分离后,通过双波长扫描测出氨基比林(λ_s=270nm,λ_R=300nm)和巴比妥(λ_s=205nm,λ_R=320nm)的含量.     

缓倾斜煤层底板采动破坏深度与回采参数关系的研究

本文根据四个不同回采参数试采面的钻孔注(放)水试验资料,研究了每个采面底板采动破坏深度和强度,分析了采面斜长、采高与底板采动破坏深度的关系,查明厚煤层分层开采时,底板破坏程度主要取决于第一分层,为改革采煤方法安全带压开采提供了依据。     

金银花,山银花中绿原酸的反相薄层分析方法研究

本文建立了用反相薄层色谱法测定金银花、山银花中绿原酸含量的方法，用键合反相Ｃ１８薄层板，以甲醇／水／甲酸为展开剂，展开后用薄层扫描仪于波长３３５ｎｍ进行扫描，两点法定量，方法的回收率为９６．８％－１０２．３％，相对标准偏差为０．２６％－３．０％。     

菲涅耳半波带法公式A_K=a_1/2±a_k/2中K值的范围

本文对在点光源照明情况下,用菲涅耳半波带法求考察点P合振幅的近似公式A_k=a_1/2±a_k/2中K值的适用范围进行了讨论,纠正了某些光学书籍中对K值范围加以限制的结论     

An improved double-threshold method based on gradient histogram

This paper analyzes the characteristics of the output gradient histogram and shortages of several traditional automatic threshold methods in order to segment the gradient image better. Then an improved double-threshold method is proposed, which is combined with the method of maximum classes variance, estimatingarea method and double-threshold method. This method can automatically select two different thresholds to segment gradient images. The computer simulation is performed on the traditional methods and this algorithm and proves that this method can get satisfying result.     

厄米-高斯光束倾斜入射类透镜介质的近轴传输

将描述光在类透镜介质中传播的Helmholtz方程化为具有线性谐振子势的Schr dinger方程形式,借助于量子力学中的"含时"么正变换技术,解析求解光束倾斜入射到类透镜介质中传输时的场分布,得到场传输的传播核因子,研究任意倾斜入射光束位形的传输问题,并对厄米 高斯光束的传输进行计算.研究结果表明:厄米 高斯光束倾斜入射进类透镜介质束宽度的演变与光束正入射的情况一样,随传输距离作周期性变化,但因光束倾斜入射,厄米 高斯光束的传输出现了新效应,即光强分布中心不再沿直线,传播方向也不断变化,出现与横坐标相关的附加局域相因子.     

Morphology of polar ionospheric O^＋ ion upflow： FAST observations during quiet time

With energetic ion measurements on FAST satellite, the morphologic features of quiet-time ionospheric O ion upflowing at altitudes of 2000 to 4000 km are drawn out for the first time. The pre-noon cusp/cleft is the predominant region of upflowing occurrence for O with lower energy. Meanwhile the pre-dawn sector near the equatorward edge of the plasma convection dominates the occurrence for the higher energy O ions. No matter whether the energy is lower or higher, the upflows occur often over a wide MLT range of lower latitudes outside the auroral oval. The upflowing within the pre-midnight (21:00― 22:00 MLT) auroral oval carrys larger energy fluxes, with extremely large fluxes for higher energy O appearing near the polar cap boundary. For altitudes of 2000―4200 km under observation, the ion conics occur much more frequently than ion beams. Ion beams are rarely found below 3000 km, while the conics occur uniformly over the observed altitudes.     

新派诗:创作与接受的倾斜——再读"新派诗"

新诗派在其创作与接受上出现倾斜的原因：情感断层导致的接受倾斜，诗体蜕变导致的诗与读者的疏离倾向，朦胧的诗与隔膜的诗导致的危机；读者在接受上，囿于欣赏水平所限及审美习惯不同，出现“读不懂”的现象。     

荧光试剂衍生化液相色谱分析生物检材中的氟乙酸钠

建立了使用新的荧光衍生试剂9-氯甲基蒽(CA)衍生化生物检材中的氟乙酸钠,并通过薄层色谱和荧光检测的高效液相色谱(HPLC)分析的方法。合成得到氟乙酸钠的荧光衍生物——氟乙酸-9-亚甲基蒽酯(MA-MFA),纯度达到98%以上,通过红外光谱、核磁共振、元素分析和质谱对其进行结构表征。薄层色谱中展开剂为石油醚/乙酸乙酯(体积比为95∶5),检测限为5×10-8g(TLC)。高效液相色谱用AgilentHypersilODS反相色谱柱,以乙腈/水(体积比为85∶15)为流动相,荧光检测波长λex为256 nm,λem为412 nm。方法在2.5×10-9~125×10-9mol/mL浓度范围内呈良好的线性关系,线性相关系数为0.9988,生物样品空白添加实验的回收率为83%~90%,最低检测限为2×10-10g(S/N=3),日内、日间RSD均小于4%。该方法用于中毒死亡者的血液样品及其他检材的测定,效果良好。     

薄层扫描法测定夏桑菊颗粒中熊果酸的含量

采用薄层扫描法测定夏桑菊颗粒中熊果酸的含量.以环己烷—氯仿—醋酸乙酯—冰醋酸(20∶5∶8∶0.5)为展开剂,检测波长为520 nm,参比波长为700 nm,SX=3,标准曲线Y=1291.28X 34.12,R=0.998 2,熊果酸在1.017-2.373μg范围内与峰面积积分值呈良好的线性关系,平均回收率100.82%,RSD=1.94%.