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941.
采用熔融织构法结合顶部籽晶技术 ,掺杂 Y2 O3粉和 Y- 2 1 1粒子制备了高质量的准单畴熔融织构的 YBCO块材。样品的 Jc测量表明 :临界电流密度 Jc在 1 0 K温度 0 .6T磁场下达到 1 .6×1 0 6 A/ cm2 ;在 70 K温度 2 T磁场下达到 1 .2 4× 1 0 4A/ cm2。扫描电镜观察表明 :掺杂 Y2 O3粉所形成的 Y- 2 1 1粒子是柱状的 ,而掺杂 Y- 2 1 1粒子在母体材料中形成的是球形的 Y- 2 1 1粒子 ,掺杂Y2 O3 粉比 Y- 2 1 1粒子能更有效地改善样品的生长状况。可见 ,Y- 2 1 1粒子与超导母体材料之间的界面对磁通钉扎起主要作用 ,Y- 2 1 1粒子作为强钉扎中心是属于界面钉扎  相似文献   
942.
使用高灵敏的光腔衰范光谱(Cauity Ring Down Spectroscopy)技术测出了异丙醇的O-H伸缩v=4、5振动泛频光谱,每个技动能级都有三个吸收峰,被归属为分子构像的O-H伸缩泛叔汲收,给出了光腔衰范光谱的振动泛频吸收的振动谱强度公式,并求得分子不同构在不同振动能级的O-H伸缩局域模振子的机械频率(X1)、非谐性(X2)以及解离能(D),用浓度泛函(DFT)B3LYP/6-31+  相似文献   
943.
α-Carbonyl radicals cyclization reactions have been applied successfully toward total synthesis of several natural products,such as modhephene,1 (-)-dendrobine,2 and (-)-5-oxosiphiperfol-6-ene.3  相似文献   
944.
Three general methods for synthesis of heteroaromatic pyrroles were reported recently from our laboratory.1 Application of these methods to the preparation of p-aminophenyl heteroaromtic pyrroles 3 will be discussed. Potential use of p-aminophenyl substituted heteroaromatic pyrroles 3 as electroluminescent materials is under current investigation.  相似文献   
945.
高效液相色谱法测定地榆中金丝桃甙的含量   总被引:9,自引:0,他引:9  
沙明  曹爱民  王冰  刘春丽  耿杰  刘威 《色谱》1998,16(3):226-228
采用高效液相色谱法测定了地榆中金丝桃甙的含量。色谱柱为Shim-packCLC-ODS柱,以甲醇-0.025mol/L磷酸(5050)为流动相,检测波长370nm,测定组分与其它组分的色谱峰达到基线分离。加样回收率平均值为98.7%,RSD为1.9%。为控制中药地榆的内在质量提供了新的测定指标和可靠的方法。  相似文献   
946.
Sulfonylurea herbicides can lead to serious weed resistance due to their long degradation times and large-scale applications. This is especially true for chlorsulfuron, a widely used acetolactate synthase inhibitor used around the world. Its persistence in soil often affects the growth of crop seedlings in the following crop rotation, and leads to serious environmental pollution all over the world. Our research goal is to obtain chlorsulfuron-derived herbicides with high herbicidal activities, fast degradation times, as well as good crop safety. On account of the slow natural degradation of chlorsulfuron in alkaline soil, based on the previously reported results in acidic soil, the degradation behaviours of 5-substituted chlorsulfuron analogues (L101–L107) were investigated in a soil with pH 8.39. The experimental data indicated that 5-substituted chlorsulfuron compounds could accelerate degradation rates in alkaline soil, and thus, highlighted the potential for rational controllable degradation in soil. The degradation rates of these chlorsulfuron derivatives were accelerated by 1.84–77.22-fold, compared to chlorsulfuron, and exhibited excellent crop safety in wheat and corn (through pre-emergence treatment). In combination with bioassay activities, acidic and alkaline soil degradation, and crop safety, it was concluded that compounds L104 and L107, with ethyl or methyl groups, are potential green sulfonylurea herbicides for pre-emergence treatment on wheat and corn. This paper provides a reference for the further design of new sulfonylurea herbicides with high herbicidal activity, fast, controllable degradation rates, and high crop safety.  相似文献   
947.
典型域的调和分析和复Clifford分析   总被引:1,自引:0,他引:1  
黄沙  乔玉英 《数学学报》2001,44(1):29-36
本文利用华罗庚、陆启铿关于多复变函数论中典型域的调和分析研究复Clif-ford分析中(四种)典型域的调和分析,讨论了两个相应边值问题正则解的存在(唯一)性及其积分表达式.  相似文献   
948.
周宇航  丁莎  夏勇  刘跃军 《化学进展》2022,34(8):1831-1862
半胱氨酸(Cys)是三种生物硫醇之一,是20种天然氨基酸中唯一一种含还原性巯基的天然氨基酸,是组成细胞内多肽和蛋白质的基本氨基酸之一。其参与体内细胞的氧化还原调控,调节体内氧化还原平衡,维持机体正常代谢,在生理过程中发挥着至关重要的作用。然而体内的Cys浓度水平异常会引起一系列生理疾病,体内的Cys浓度作为几种疾病的生物标志物具有临床意义。因此有效地识别和检测半胱氨酸受到越来越多的研究者们的青睐。相较传统检测方法,荧光探针因其操作简单、灵敏度高、响应迅速和实时检测等优点,已被广泛用于检测生物硫醇。本文基于常见荧光团的结构性能特征,综述了近三年来检测Cys的荧光探针,重点概述了其传感机制,并对其生物应用进行了简要说明,展望了未来Cys探针的研究方向与应用前景。  相似文献   
949.
A series of novel 1,3,4-thiadiazole derivatives possessing benzisoselenazolone scaffold were designed and synthesized, and their antitumor activities against human cervix adenocarcinoma(HeLa), human liver cancer cell(SMMC-7721), human breast cancer cell(MCF-7) and human lung cancer cell(A549) lines were evaluated by CCK-8 assay, The bioassay results demonstrate that most of the tested compounds showed potent antiproliferative effects against various cell lines. Furthermore, compounds 7c, 7e, 7h, 7i and 7k showed significant antiproliferative activities against SMMC-7721 cells, with IC5o values of 2.38, 2.67, 1.35, 2.75 and 2.48 μmol/L, respectively. Com- pounds 7a, 7e, 7j and 71 exhibited highly effective antitumor activities against MCF-7 cells, with IC50 values of 2.89, 2.95, 1.12 and 2.75 μmol/L, respectively. Compound 7j was found to be the most potent compound against A549 cells, with an IC50 value of 1.25 μmol/L. The pharmacological results suggest that the substituents of benzylthio-moiety at position 2 on 1,3,4-thiadiazole are vital for modulating antitumor activities against various cancer cell lines.  相似文献   
950.
In search of environmentally benign insecticides with high activity, low toxicity, and low residue, a series of novel anthranilic diamide containing propargyl ether were designed and synthesized. All compounds were characterized by 1H NMR spectroscopy, high‐resolution mass spectrometry, or elemental analysis. The single crystal structure of 18g was determined by X‐ray diffraction. The insecticidal activities against Lepidoptera pests of the new compounds were evaluated. Their insecticidal activities against oriental armyworm (Mythimna separata) and diamondback moth (Plutella xylostella) indicated that most of the compounds showed moderate to high activities at the tested concentration.  相似文献   
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