蒙脱石—氯化铁红外光谱分析

通过吡啶吸附红外光谱分析了蒙脱石(EC_1)、蒙脱石—氯化铁(EC_4(Ⅱ)、EC_4(Ⅲ)、EC_7、EC_9)特征吸收峰的相对强度。在EC_4(Ⅱ)、EC_4(Ⅲ)、EC_7、EC_9中,B酸1540cm~(-1)吸收增强,而L酸在1440cm(-1)吸收所占总酸量的比例下降。对于苯与氯化苄的反应,L酸1440cm(-1)附近吸收所占总酸量的比例越小,催化剂的催化性能越强。     

外源水杨酸对玉米幼苗盐害的缓解作用

以玉米为材料,研究水杨酸对盐渍条件下玉米幼苗生长的影响。结果表明,外源喷施一定浓度的水杨酸能够缓解幼苗盐害。表现为叶片叶绿素含量提高,光合作用能力增强,可溶性蛋白含量上升,叶片渗透势降低。同时,幼苗鲜重、干重增加。     

BCK(BCI)-代数中的L-fuzzy理想

研究BCK(BCI)_代数中的L_fuzzy理想 ,其中L为至少含有两个元素的格 .研究了BCK(BCI)_代数中的L_fuzzy理想及其相应的截理想之间的关系 .对BCI_代数 ,引入了L_fuzzy闭理想、L_fuzzy正则理想 ,研究了两者之间的关系 .得到的结论是 :任一L_fuzzy正则理想一定是L_fuzzy闭理想 ,在任一p_半单BCI_代数中 ,L_fuzzy闭理想一定是L_fuzzy正则理想 .对BCK_代数 ,引入了L_fuzzy关联理想的概念 ,得到了它的一些等价特性 ,并用L_fuzzy关联理想刻划了关联BCI_代数     

高粱-苏丹草杂交种品质性状的研究

通过对高粱 苏丹草杂交种品质性状的调查与分析 ,发现高粱 苏丹草杂交种营养丰富 ,氰化物含量低 ,适口性好 ,可作为畜牧、水产养殖业青刈或青贮的优质饲料     

钢筋砼L-形截面双向拉弯构件正截面承载力的研究

对钢筋砼 L-形截面双向拉弯构件的正截面承载力进行了研究 ,还对三根钢筋砼 L-形截面双向拉弯构件进行了试验研究 .编制了计算机程序 ,可用于各种类型截面的计算 ;并用此程序对 L-形截面在双向拉弯作用下的 N- M相关曲线、等轴力下的 Mx- My相关曲线进行了计算分析 ,理论计算结果与试验结果吻合较好     

Dornyei二语学习动机框架的研究与应用

动机是影响学习成效的一个重要因素,因此动机研究也是外语教学研究最重要的课题之一。几十年来,在研究过程中涌现出的各种动机理论和动机框架对我国的英语教学改革影响至深。本文拟从介绍Dornyei的二语动机框架着手,分析其三层面动机因素对我国大学英语教学改革的启发。     

The comparison of the three assays for determination of fecal calprotectin in inflammatory bowel disease

IntroductionFecal calprotectin is a biomarker for monitoring inflammatory bowel disease (IBD) activity. Our aim, therefore, was to evaluate two new assays, the point of care test Quantum Blue and the Liaison Calprotectin with respect to the Calprest, commonly used assay, and to determine their performance for IBD diagnosis.Materials and methodsWe included 73 prospective patients with IBD. Fecal calprotectin was measured and analysed with the routine Calprest assay and two recently introduced assays, the Quantum Blue and the Liaison Calprotectin. Furthermore, we compared the results by Bland and Altman analysis, and Passing-Bablok regression.ResultsWe observed no difference in median calprotectin values obtained by the Calprest (94.6 µg/g, 95%CI 66.5 to 166.1) and Liaison assay (101.0 µg/g, 95%CI 48.1 to 180.1) whereas significantly higher concentrations were obtained with the Quantum Blue assay (240.0 µg/g, 95%CI 119.9 to 353.2). The mean absolute and relative difference between the Calprest and Quantum Blue methods was statistically significant (- 162.3 µg/g and
- 143.1%). Mean absolute difference between the Calprest and Liaison calprotectin methods was positive (2.2 µg/g). The agreement between assays revealed that Quantum Blue and Calprest have fair agreement with Kappa coefficient of 0.38 (95%CI 0.26 to 0.51). Liaison Calprotectin and Calprest revealed moderate agreement with a weak Kappa coefficient of 0.47 (95%CI 0.32 to 0.62).ConclusionClinicians should be aware of these differences between the assays and avoid comparison of their respective results.     

The sidestep cutting manoeuvre requires exertion of lumbosacral lateral flexion torque to avoid excessive pelvic obliquity

During sidestep cutting, the pelvis is supported only on one side; this affects the athlete’s posture. This study investigated the mechanism to avoid excessive pelvic obliquity during sidestep cutting. Ten physically active men performed sidestep cutting with maximal effort, and we captured the kinematics and kinetics with force platforms and an eight-camera motion capture system. Our results indicated that the stance hip exerted little abduction torque; however, lumbosacral lateral flexion torque was exerted towards the free-leg side (peak value: 3.39 ± 0.91 N m/kg). Although bilateral hip joint forces acted to drop the free-leg side of the pelvis, the net torque around pelvic elevation/drop axis was nearly zero during the entire stance phase and the change in the angular momentum around the pelvic elevation/drop axis from touchdown to toe-off was negligible (?0.004 ± 0.003 N m s/kg). The integrated components of lateral flexor for elevating the free-leg side of the pelvis (0.220 ± 0.072 N m s/kg) were significantly larger than any other integrated components, which were all negligible (<0.010 N m s/kg). Thus, sidestep cutting requires the lumbosacral lateral flexion torque exertion to neutralise the passive action that drops the free-leg side of the pelvis.     

活性碳在半夏组织培养中的使用

在半夏成熟叶片的初代培养中,使用０．２５￣０．５％的活性碳对材料褐变有抑制作用;而加入活性碳对半夏试管苗的伸长有促进,但不同浓度差异不显著;０．０５￣０．２５％的活性碳能降低半夏玻化苗率,１％的活性碳则对苗的生长有抑制。     

离体玉米芽尖中酚类物质产生的影响因素

玉米芽尖分生组织培养过程中,酚类物质的产生与培养芽尖的基石莳背景明显相关,培养基的Ｐ迂低或过高均会加剧芽尖的酚类物质产生。蔗糖浓度在２０￣４０％范围内变化和使用活性炭对芽尖产生酚类物质的影响不明显。