Totally found 10149028 items.

  • [专利] 一种​油菜​专用​化肥​及其​制备​方法
    (CN104311269) 本​发明​公开​了​一种​油菜​专用​化肥​及其​制备​方法,由​以下​质量​份数​配方​成分​组成:尿素​24-26​份、磷酸​二​铵​20-22​份、生石灰​粉​17-19​份、硫酸铵​15-17​份、增产​菌肥​12-14​份、紫花苜蓿​绿肥​13-15​份、碳酸​锰​10-12​份、复​硝​酚​钠​8-10​份、腐熟​牛粪​10-13​份、草木灰​7-9​份、腐殖酸​4-6​份、硼酸​5-7​份、百​菌​清​3-5​份、扑​虱​蚜​2-4​份、水​40-50​份,本​发明​营养物质​丰富,增强​油菜​的​抗旱、抗寒​和​耐​病​性,增强​油菜​茎​叶​等​器官​的​光合作用,促进​碳水化合物​的​正常运转,促使​油菜​生长发育​健壮,根系​发达,枝叶​繁茂,显著​地​提高​油菜​产量​与​质量。
  • [专利] 一种​头​孢​洛宁​的​制备​方法
    (CN104725403B) 本​发明​涉及​种​头​孢​洛宁​的​制备​方法,该​方法​是以​头​孢​噻吩​酸​和​异​烟​酰胺​为​原料,在​低温​下​反应​得到​产品。头​孢​噻吩​酸​溶解​在​有机​溶剂​中,利用​硅​烷​化​保护​试剂​进行​羧基​保护,继而​与​三甲​基​碘​硅​烷​发生​碘​代​反应;然后​与​异​烟​酰胺​进行​胺​化​反应,最后​经​醇​解脱​保护,低温​下​调节​pH​析​晶​得到​头​孢​洛宁。本​发明​在​有机​溶剂​中​选择​硅​烷​化​试剂​保护​头​孢​噻吩​酸,继而​与​三甲​基​碘​硅​烷​反应,反应时间​短,条件​温和,反应​完全,几乎​无​副反应​发生;采用​混合​溶剂​结晶​方法,可以​达到​干燥​快、颜色​浅、收率​高的​特点,另外​溶剂​可以​回收,减少​污水​的​量,具有​明显​的​经济效益​和​环境​效益,有利于​实现​工业化生产。
  • [专利] 防治茄子绵疫病的液体肥
    本发明公开了一种防治茄子绵疫病的液体肥,其包括以下重量份的原料:蛋白胨10~20份、蔗糖6~8份、杨树叶26~30份、山楂花5~10份,绿茶粉10~12份、烟叶粉6~8份、枇杷叶6~8份,生姜4~6份、绞股蓝5~10份、复合维生素4~6份、复合氨基酸8~12份、微生物菌剂13~18份、胡椒叶4~5份、牡蛎壳粉3~4份、芸苔素内酯4~8份、大黄素甲醚10~15份、弱酸电解水20~30份和蒸馏水50~100份。本发明制备的肥料能有效预防茄子的绵疫病以及提高茄子产量等特点。
  • [期刊] 4-氨基安替比林萃取光度法测定水中挥发酚的不确定度评定
    通过对4-氨基安替比林萃取光度法测定水中挥发酚的分析,对测定不确定度进行评估、分析和计算。
  • [会议] Closed Stability-Margined Regions for the Second-Order System with Robust Stability
    This paper generalizes the dented stability triangles for the second-order recursive digital system such that the borderlines of the dented stability triangles are included in the stability-margined (SM) region. This generalization enables the system designer to formulate the second-order system design more easily. More specifically, the existing inequalities for guaranteeing a specified stability margin are the inequalities that exclude the boundaries (borderlines) of the dented SM-regions, while this paper presents two sets of new inequalities that include the borderlines of the SM-regions and thus such inequalities produce a closed SM-region. In other words, the existing SM-regions are defined by using "less than" inequalities, while the new inequalities are "less than or equal to" inequalities. The added "equal to" constraints produces a closed region that includes borderlines in the SM-region. It is found that the resulting closed SM-regions are more convenient and more suitable for designing the second-order recursive system with robust stability.
    关键词: Circuit stability;Robust stability;IEEE Regions;Conferences;System analysis and design;Signal processing;Transfer functions
  • [期刊] 有机-无机柱撑蒙脱石的制备与脱硫性能
    用钠化改性的蒙脱石为基质,采用超声波法合成了具有一定比表面积的十六烷基三甲基氯化铵(HDTMACl)-锌铝柱撑蒙脱石.以有机-无机复合柱撑蒙脱石为负载基质,制备以锌、铜、锰复合氧化物为活性组分的脱硫剂,采用X射线粉末衍射(XRD)和比表面积测定(BET)对其进行表征.以天然气中的硫化物(H2S、CS2、COS等)为脱除对象,对制备的脱硫剂进行脱硫实验,根据出口硫化物质量含量探讨了在不同的复合柱撑蒙脱石负载基质用量、温度、压强及空气流速条件下,使用所制备脱硫剂对脱硫实验效果的影响.对脱硫效果进行对比,认为复合柱撑蒙脱石负载基质的用量占脱硫剂的30%时脱硫效果好.脱硫最佳工艺条件为:脱硫温度为250 ℃,压强为1.0 MPa,空速为1000 h-1.
  • [期刊] 间接分光光度法测定茶叶中茶多酚
    在盐酸介质中,茶多酚可以定量地将硅钼黄还原为硅钼蓝,通过测定硅钼蓝的吸光度,可间接测定茶多酚的含量,从而建立了硅钼蓝光度法测定茶多酚的新方法。通过试验研究确定了测定茶多酚的最佳条件。结果表明,显色体系的最大吸收波长为730 nm,茶多酚质量浓度在4.000~64.00μg/mL范围内服从比尔定律,线性相关系数γ=0.999 1,方法检测限为0.000 097 mg/mL。该方法用于绿茶和红茶中茶多酚含量的测定,结果与国标法相符,精密度(相对标准偏差)分别为0.9%,0.4%,加标回收率分别为98.6%~100.8%和97.8%~101.7%。
  • [专利] METHOD OF MANUFACTURING PLANTS FROM fitness plastics bored PROPERTIES
    (VN--35503) The invention relates to methods of producing molded from plastic material with certain characteristics gas, by making sure that the air thin and almost colorless gas with certain features on the surface of the object by molding of plastics Government of physical deposition CVD, using only raw material with high safety gas. The method of the invention for producing molded from plastic material with certain characteristics gas (90) by making sure air thin film properties (92) on the surface of the plastic molding material (91), This method comprising the step of creating the film, in which thin sure gas (92) is generated on the surface of the object casting the CVD method, in which the original silane compound organic chemical formula 1 is used as the main raw material, oxidizing gas is used as the auxiliary gas and heating using details contained We do major components. H [3] Si-Cn-X (chemical formula 1) Where n is 2 or 3, and X is SiH [3] H or NH [2. ]
  • [专利] 蛋白酪氨酸磷酸酯酶1B抑制剂γ-丁内酯类化合物、制备方法和用途
    本发明涉及医药技术领域,具体是一类从植物豺 皮樟(L.rotundifolia var.oblongifolia)树皮中提取、分离获得的新 型的具有蛋白酪氨酸磷酸酯酶1B抑制活性的γ-丁内酯类化 合物,结构如右:其中R为H、C1-6的烷基或苯基。经多次体外蛋白酪氨酸磷酸酯 酶1B抑制实验表明,该类化合物具有明显的PTP1B抑制活性, 可在制备糖尿病、肥胖症及并发症药物中应用。对开发利用中 国的药用植物资源具有重要意义。
  • [期刊] 桔梗茎总黄酮的纯化工艺及其抗氧化性研究
    为探索大孔吸附树脂纯化桔梗茎总黄酮的工艺条件及其体外抗氧化活性,以总黄酮的比吸附量、吸附率及比洗脱量、洗脱率为考察指标,采用单因素试验对桔梗茎总黄酮的纯化工艺进行考察;采用分光光度法探索了桔梗茎总黄酮对DPPH·、亚硝酸盐、ABTS阳离子自由基、·OH的清除活性.结果 表明,桔梗茎总黄酮纯化的较佳工艺条件为:桔梗茎浸提液采用石油醚脱脂,控制其总黄酮质量浓度1.1 mg/mL,桔梗茎浸提液的上柱体积与树脂质量比6∶1 (mL/mg),吸附流速控制1.0 mL/min,洗脱液为70%乙醇水溶液,洗脱流速控制2.0 mL/min,洗脱液体积与树脂质量比7∶1(mL/mg).在此纯化条件下,LX-36型树脂对桔梗茎总黄酮的比吸附量平均为5.933 mg/g、吸附率平均为89.89%,比洗脱量平均为5.627 mg/g、洗脱率平均为94.83%,干浸膏中总黄酮含量由6.35%提高到40%以上.研究结果表明,桔梗茎总黄酮对DPPH·、亚硝酸盐、ABTS阳离子自由基、·OH均具有清除活性,而且均随着其质量浓度的增加,清除活性均逐渐增强.该结果为桔梗茎的进一步开发利用提供了依据.
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