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Search Results: 1 - 10 of 18326 matches for " 孟朔 "
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基于TG-DTG的祖师麻甘草制的炮制机制研究
祥龙,郭晓慧,
中国中药杂志 , 2012,
Abstract: 目的:探讨祖师麻甘草制法的炮制机制。方法:在热重分析仪上,采用模拟空气(N2-O24:1)为载气,5℃·min-1升温速率,对渗漉法提取的祖师麻有效部位,石油醚、氯仿、乙酸乙酯、正丁醇部位,甘草汁固体粉末,祖师麻有效部位与甘草汁固体粉末按原药比例10:1,10:2,10:3的混合物分别进行热解特性研究。结果:与祖师麻有效部位的TG-DTG曲线比较,刺激性较强的石油醚部位主要失重温度为320~390℃,且随着甘草汁固体粉末加入量的增加,354℃处的0.69%·min-1的失重速率峰逐渐前移,并最终与265℃附近的失重速率峰合并;另外,祖师麻有效部位于291℃处的2.38%·min-1和516℃处2.42%·min-1的热失重速率峰向低温方向移动,移动幅度约为20~26,19~50℃,前者热失重速率峰峰值明显降低,后者明显增高。结论:随着甘草汁固体粉末加入量的增加,祖师麻有效部位在程序升温下加热致使石油醚部位易于失去,同时对于祖师麻的主要药效成分的损失起到减缓作用,佐证了TG-DTG用于中药炮制机制研究的科学性及祖师麻经甘草制后刺激性降低的炮制机制。
耕作力学研究中的土壤结构表现与评价
丁启,丁为民,为国,韩英
农业机械学报 , 2007,
Abstract: 南京地区农地耕作层土壤显示2种土壤结构形态:机械耕作以及生物学特征的土壤结构表现。前者表现为可分离的较大尺度土垡,且土垡影响到作物根系的生长;后者表现为生物孔洞的存在。将涵盖所有尺度的土壤粒子构成的耕层土壤空间拓扑关系定义为土壤“广义结构”,从而使耕作研究超出于土壤结构的农业与化学框架。耕作影响到土壤的广义结构,进而影响到不同尺度下生物系统的繁殖、生长与活动。
铜片上水热法制备纳米Cu2S薄膜及光吸收性能
Characterization and Optical Absorption Property of Cu2S Nano-Films Prepared by Hydrothermal Method on Cu Foil
 [PDF]

, 刘劲松, 李子全, 陈建康,, 许奇, 丁滔, 王春花, 高雪琴, 王莉萍
Hans Journal of Nanotechnology (NAT) , 2012, DOI: 10.12677/nat.2012.21002
Abstract:
采用水热法以硫代乙酰胺为硫源在铜片上沉积了Cu2S纳米薄膜,研究了添加剂种类对产物结构、形貌及紫外–可见光吸收性能的影响。X射线衍射仪(XRD)、场发射扫描电镜(FE-SEM)和红外光谱(IR)测试表明,产物为正交结构Cu2S,添加剂影响着产物的结晶及形貌。机理分析显示,在水热条件下添加剂以不同的方式参与了薄膜的形成过程。紫外–可见(UV-vis)光吸收性能测试及直接带隙计算表明,与Cu2S本体相比,所得薄膜带隙出现了不同程度的蓝移,这归因于样品的量子限制效应影响大于库仑项的影响。
Cu2S nano-films were synthesized on copper foil with TAA as sulfur sources by hydrothermal method. The effect of the different additions on structures, morphology and UV-vis absorption property of the films has been studied by X-Ray Diffraction (XRD), Scanning Electron Microscope (FESEM) and Infrared (IR) spectra and UV-vis absorption spectroscopy. The results show that the crystallinity and morphology of the Cu2S with orthogonal structure depended on the additions. The formation of the films was thought to come from the interaction between the additions and the reactants under the hydrothermal conditions. The UV-vis absorption spectra and the (αhν)2-hν curves suggest that the calculated band gap values indicated the distinct blue shift compared to that of the bulk Cu2S, which is attributed to the stronger quantum confinement effects than the Coulomb term.
基于热分析的炉甘石煅制研究
祥龙,马俊楠,崔楠楠,平宇航,李坤,
中国中药杂志 , 2013,
Abstract: 采用热重(TG)技术、热质联用(TG-MS)技术、红外光谱技术(FTIR)和扫描电镜(SEM)-能谱仪(EDS)联用技术探讨炉甘石热解特性,对炉甘石热解前后相关元素含量、整体形态、官能团及挥发分等变化进行定性、定量研究,发现200~360,580~750℃为炉甘石煅制过程中药效成分变化的2个敏感温度区间,200~360℃为ZnCO3,Zn(OH)2,ZnCO3-2Zn(OH)2-H2O热失重,580~750℃为CaCO3热失重。化学反应动力学研究结果表明,具有良好的线性关系。该试验融汇物理化学及中药炮制学的相关方法及理论,阐释炉甘石煅制炮制工艺及机制,为其他中药炮制的现代研究提供一个很好的范例。
冲击作用下粘性土壤破碎体的分形维数与影响因
凤英,丁启,鹿飞,丁为民,潘根兴
农业机械学报 , 2009,
Abstract: 给出冲击破碎分析的两倍尺度控制约定,研究粘结态土壤破碎体生成的影响因素,建立了土壤破碎体分形维数与落锤质量、冲击行程、土壤含水率、破碎比能之间的关系。结果表明,土壤破碎体的分形维数与落锤质量及冲击行程没有联系,但分形维数与土壤含水率及破碎比能具有明显的相关性。另外,通过比较得知土壤在冲击作用下的破碎体分形维数远远低于植被土样的分形维数。
氧化石墨烯增强环氧树脂复合材料的制备及其力学性能研究
胡涛,赵东林,程兴旺,,丁泽文,吴路路
- , 2018, DOI: 10.13543/j.bhxbzr.2018.06.005
Abstract: 以天然石墨为原料,利用改进的Hummers法制备氧化石墨烯,并对其进行X-射线衍射(XRD)和傅里叶变换红外光谱(FT-IR)表征。之后利用一种新型的有机溶剂三缩水甘油基对氨基苯酚(TGPAP)作为相转移剂和表面活性剂,将氧化石墨烯(GO)从水溶液转移到环氧树脂基体中,去除水分,加入固化剂进而得到混合液,最后利用浇铸法得到复合材料。通过万能测试拉力机对复合材料的拉伸性能和弯曲性能进行测试,结果表明氧化石墨烯的加入能够有效增强复合材料的力学性能:在添加0.1%(质量分数)的氧化石墨烯时,复合材料拉伸强度达到最大值77.29 MPa,与不添加氧化石墨烯相比提高了26.60%;在添加1.0%的氧化石墨烯时,拉伸模量达到最大值2 451.99 MPa,与纯环氧树脂相比提高了21.69%。
Abstract:Graphene oxide has been prepared from natural graphite by the well-known Hummers' method with some modifications and the GO was characterized by XRD and FT-IR. Triglycidyl para-aminophenol (TGPAP) was used to facilitate direct and rapid transfer of the GO dispersion from water to an epoxy resin. The TGPAP acted not only as a phase transfer agent but also as an efficient surface modifier. Removal of the water from the epoxy resin and additon of hardener to the mixture afforded composite materials by a casting method. The tensile and flexural properties of the composites were measured with a universal tensile testing machine. The result showed that the mechanical properties were enhanced after the addition of graphene oxide. When the concentration of GO in the epoxy matrix was 0.1 wt.%, the tensile strength reached its maximum value of 77.29 MPa, which is 26.60% higher than that without GO, and the tensile modulus reached a maximum of 2 451.99 MPa at a GO concentration of 1.0wt.%, which is 21.69% higher than the corresponding value for the pure sample.
冷铁超导二极磁体

科学通报 , 1983,
Abstract: 一、编织带导体根据脉冲二极磁体的要求,确定了表1所示编织带导体的主要参数。编织带内充有软金属铟,充铟的目的是有助编织带的成型和提高编织带的电流密度。编织带外面用20μm的聚酯薄膜螺旋式半叠包作绝缘。磁体最大设计电压500V。当磁体用交流励磁时,在绕组中产生
东汉县廷行政运作的过程和模式——以长沙五一广场东汉简为中心
The County Courts’ Administrative Process and Pattern in the Eastern Han——A Study Centering on Changsha Wuyi Square Eastern Han Strips and Tablets

王 
- , 2018,
Abstract: 摘要 本文以长沙五一广场东汉简为中心,从信息获取途径、应对方案的制定和落实三个方面揭示东汉县廷行政运作的过程。经考察可知,东汉中晚期县廷的行政运作已进入较为成熟稳定的阶段。不仅获取和验证信息的途径变得多样化,县属吏分工更加明确有序,而且县廷的应对方案也更具针对性。通过梳理县廷行政运作诸环节还可以见出县属吏是协助县长吏完成日常统治的重要力量,二者的“合作共治”是东汉县廷行政运作的常态模式。该模式是东汉王朝统治地方社会的重要方式,持久地影响着汉末以降的历史进程。
Abstract:Centering on the Changsha Wuyi Square Eastern Han Strips and Tablets, this essay reveals the administrative process of the county courts in the Eastern Han in respects of the channels of obtaining information, the formulation and implementation of coping plans. It can be seen from this study that the administration of county courts in the middle and Late Eastern Han had developed into a mature and stable stage. It can also be seen that the county clerks and subordinates were important forces in assisting the senior executives to carry out the daily rule, their “co-operation and co-governance” was the normal pattern of the county administrative system in the Easter Han, which was a major method of regional governance by the Eastern Han Empire and affected the historical process since the end of the Han in a sustained way.
黄岑的结构与黄岑苷含量的关系
李欣,
植物科学学报 , 2009,
Abstract:
带有内部热集成的多储罐间歇精馏全回流操作
,白鹏
化工学报 , 2015, DOI: 10.11949/j.issn.0438-1157.20150447
Abstract: 鉴于间歇精馏热力学效率低的缺点,提出带有内部热集成的多储罐间歇精馏全回流操作(IHIMVBD)分离二元混合物的新型操作方式。在该操作中,多储罐间歇精馏塔被同轴的夹套式再沸器环绕,利用安装在再沸蒸汽管线上的压缩机使精馏塔的操作压力高于夹套式再沸器,使热量通过精馏塔壁面从高压的精馏塔传向低压的再沸器,实现热量的内部集成。为了进一步提高热力学效率和经济效益,将塔顶蒸汽再压缩技术应用于IHIMVBD,构成强化的内部热集成多储罐间歇精馏全回流操作(Int-IHIMVBD)。该操作能额外利用被压缩的塔顶蒸汽的潜热供给塔釜料液再沸,实现塔顶蒸汽与塔釜料液的热集成。通过模拟分离乙醇-正丙醇的实例表明,相比MVBD和IHIMVBD,Int-IHIMVBD能显著提高分离过程的热力学效率和经济效益。
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