樟木脂素和芳樟叶浸膏的定香作用

通过试验确定樟木脂素和纯种芳樟叶浸膏在香精中的定香作用。同时列举了几个含樟木脂素和纯种芳樟叶浸膏的香精及定香基的配方。     

纯种芳樟及其组培苗叶油的分析报告

本文介绍了“纯种芳樟”的寻找与发现过程 ,利用组织培养育苗后叶油化学成份变化规律 ,为芳樟的组织培养育苗、栽种提供了令人信服的理论依据     

纯种芳樟叶油及其乙酰化物的香气特征

本文详细介绍了纯种芳樟叶油、乙酰化纯种芳樟叶油与合成芳樟醇、"天然芳樟醇"、合成乙酸芳樟酯不同的香气特征和应用范围,文中列举了几个用纯种芳樟叶油和乙酰化纯种芳樟叶油配制的香精实例以供参考.     

广西樟油的化学成分分析

利用气相色谱/质谱联用仪及气相色谱仪分别对广西樟油的化学成分进行定性和定最分析。结果表明．广西杂樟油、芳樟油及芳樟叶油含有的主要成分基本一致，且几乎都是单萜和倍半萜化合物，只是相对含量上有差异。     

叶用芳樟的选种与栽培

芳樟是樟科的一个品种,其叶的精油中,芳樟醇的含量高低相差悬殊,低的仅30％,高的可达90％,直接关系芳樟基地的经济效益,因此,我厂在1985年以后新建的芳樟基地中,接受以往走过的弯路,以及兄弟厂的经验教训,十分重视选择采集含芳樟醇量高的芳樟母树采种育苗,并且进行选择,严把种苗质量关,以提高芳樟基地的质量。同时,我厂还对施肥防治虫害及修剪等栽培措施做了一定的研究,取得了预期的效     

芳樟精油的开发与利用研究进展

芳樟是我国十分重要的工业原料树种,可用于提取芳樟精油,具有很高的开发利用价值。本文概述了芳樟人工林的开发现状,芳樟精油的成分分析,芳樟精油的提取技术,以及芳樟精油在香精香料、医疗保健、家庭卫生等领域的深加工利用研究现状,并对未来芳樟精油的提取技术、深加工利用、应用机理等方向进行展望,以期为芳樟精油的开发与利用提供参考。     

纯种芳樟叶油与芳樟叶酊（三）

(接上期P18)2百花香精纯种芳樟叶油24乙酸芳樟酯10铃兰醛6新铃兰醛6乙酸苄酯8甲位己基桂醛4玫瑰醇6乙酸对叔丁基环己酯5紫罗兰酮4香柠檬油5苯乙醇5水杨酸戊酯3玳玳叶油2香紫苏油2桂花净油2茉莉净油2玫瑰净油1卡兰加油3纯种芳樟叶含纤维素20-30%,半纤维素15-20%,木素10-15%,蛋白     

乙酸芳樟酯的合成研究

以芳樟醇和醋酐为原料 ,无水K2 CO3为催化剂合成了乙酸芳樟酯。反应最佳工艺条件为 :醇酐质量比为 1∶1 2 ,催化剂用量为芳樟醇投料量的 4 % ,反应时间为 2 4h ,反应温度为 116± 2℃。芳樟醇转化率大于 95 2 % ,产品中乙酸芳樟酯含量大于 94 1%。     

纯种芳樟叶油与芳樟叶酊（二）

樟树和芳樟的一个特点是用种子繁殖时易发生化学变异——大约只有20-30％能保持母本的特性。因此，即使你找到一株叶油含芳樟醇98％的“纯种芳樟”，用它的种子播种育苗，也只有极少部分算是“芳樟”，其余仍是杂樟。看来只能用“无性繁殖”才能解决这个难题。厦门牡丹香化实业有限公司的科研人员在闽西山区找到几株叶油含芳樟醇高达98％以上、桉叶油素和樟脑含量均低于O．2％的优良品种，采用组织培养和嫩枝扦插相结合的方法大最育苗成功，几年来在福建、浙江种植了5万多亩，2005年开始采收提油，     

水蒸汽蒸馏中蒸馏时间与芳樟叶油成分及出油率关系的研究

采用水蒸汽蒸馏法提取不同蒸馏时间的芳樟醇型樟叶油,研究蒸馏时间对樟叶油的化学成分及出油率的影响。结果表明,蒸馏时间对樟叶油的成分及出油率有较大的影响,随着蒸馏时间的延长,低沸点的轻组分和主要成分芳樟醇的含量及出油率逐渐降低,高沸点的重组分却在增加,在3 h以内,相对出油率已超过96%。因此水蒸汽蒸馏芳樟叶油蒸馏时间控制在3 h为宜。     

828 nm近红外光激发下Ho3+掺杂NaYF4的上转换发光性质

采用水热法合成了NaYF4:Ho3+上转换发光材料,用XRD、红外光谱、能谱及荧光光谱等对其进行表征,探讨了掺杂浓度、退火温度对上转换发光特性及晶型的影响. 结果表明,在828 nm近红外光激发下,在Ho含量0.7%(mol)、退火温度900℃时,样品的上转换发光效果最好,退火前样品发射蓝、黄光,700℃退火后,除发射蓝、黄光外,出现绿光的尖锐强峰,且温度越高其发光强度越高;退火温度为400℃时样品为a相和b相的混合相,随温度升高晶型转变为纯b相;Ho3+的上转换发光机制为能级跃迁,绿光、黄光、蓝光分别对应5F4,5S2?5I8, 5I5?5G6和3K8,5F3?5I8跃迁.     

不同烷氧基钬掺杂增韧聚苯乙烯的研究

采用四种烷氧基钬化合物掺杂和苯乙烯本体聚合制备了不同掺钬聚苯乙烯材料，XPS测试表明掺杂聚苯乙烯中存在着钬离子和聚苯乙烯大分子苯环π电子之间存在配位作用。SEM照片和DMTA的数据探讨烷氧基钬增韧聚苯乙烯的作用机理，并讨论不同链长的烷氧基对聚苯乙炮的增韧作用影响，表明掺钬聚苯乙烯的冲击强度显著提高，表明烷氧基钬对聚苯乙烯有明显的增韧改性作用。     

Role of active slip systems induced with holmium impurity in Bi-2212 ceramics on mechanical design performance and morphological properties

Effect of Ho/Bi partial replacement in Bi_2.1-xHo_xSr_2.0Ca_1.1Cu_2.0O_y (Bi-2212) superconductors on the fundamental structural, morphological and mechanical performance properties are investigated by Scanning Electron Microscopy (SEM) and Vickers hardness (H_v) measurement techniques. Crystallinity quality and surface morphology including the microcrystal coalescence orientations, grain alignment distributions, microscopic structural problems, microvoids, internal defects, uniform surface view, porosity and particle growth distribution are visually examined with the aid of SEM. Basic mechanical performance and characteristic features of Bi/Ho substituted Bi-2212 superconducting ceramics (0.00 ≤ x ≤ 0.10) are also determined with Vickers tests conducted at various loads intervals 0.245–2.940 N. Experimental findings show that the characteristic features enhance seriously in case of x = 0.01 due to refinement of crystallinity quality and slip systems. Thus, the optimum Ho concentration presents the highest mechanical fracture strength to the load applied as a result of better uniform surface appearance and grain orientations, well-connected flaky layers, larger particle size distribution and denser structure, confirmed by the SEM investigations. Namely, much more load is required to accelerate the dislocation movement and crack propagation to the terminal velocity for critical size growth. The fracture predominantly takes place in the transcrystalline regions and hence the propagations are easily controlled with the optimum Ho dopant ions. On the other hand, the increase in the Ho ions in Bi-2212 structure induces the crack-initiating defects for new stress concentration sites. In conclusion, the permanent and non-recoverable deformations appear at even lower indentation test loads. All samples present indentation size effect feature depending on the dominant character of elastic recovery mechanism. Further, original hardness parameters are semi-empirically analyzed in the plateau limit regions using mechanical modelling approaches for the first time. Based on the analyses, Hays–Kendall model exhibits the closest results to the experimental findings.     

Separation of La(III), Eu(III), and Ho(III) with Sorbents Impregnated by Mixtures of Acidic Phosphoryl Podands and Amines in Nitric Acid Solutions

ABSTRACT

The possibility of separation of La(III), Eu(III), and Ho(III) as respective individual representatives of light, medium, and heavy rare earth elements was studied using sorbents impregnated by mixtures of acidic phosphoryl podands derived from diethylene glycol and octyl, dioctyl, and trioctyl amines from nitric acid solutions of various concentrations. The influence of the phosphoryl podands structure, their percentage content, and proportion in a sorbent and the nature of an acid on the efficiency of separation of La(III), Eu(III), Ho(III) was studied. It is shown that the greater is the concentration of HNO₃, the smaller are the separation factors of REEs, and remarkably so. The most efficient separation is achieved with the concentration of HNO₃ not over 0.04 mol/L. The optimal conditions of separation of La(III), Eu(III), and Ho(III) with the developed sorbent were found. Repeated use of the sorbent for the separation of La(III), Eu(III), and Ho(III) after its regeneration with 0.04 mol/L HNO₃ was estimated. It was found that the efficiency of separation of REEs with the sorbents impregnated by a mixture of 1,5-bis(2-oxyethoxyphosphoryl-4-ethylphenoxy)-3-oxapentane and trioctylamine (TOA) exceeds markedly that made of a mixture of di-(2-ethylhexyl)phosphoric acid (DEHPA) and TOA.     

从苎麻叶中制取叶绿素铜钠

研究了从苎麻中提取叶绿素的方法, 并可制得叶绿素镁钠、脱镁叶绿素酸、铜叶绿素酸、叶绿素铜钠等一系列产品, 叶绿素的总收率为１－２３ ％ （ 以苎麻叶计） 。     

The Extraction and Separation of Ho,Y, and Er(III) with the Mixtures of Cyanex 302 and Another Organic Extractant

Abstract

The extraction and separation of Ho, Y, and Er(III) with the mixtures of bis(2,4,4‐trimetylpentyl)monothiophosphinic acid (Cyanex 302) and another organic extractant, such as acidic organic extractant (di‐2‐ethylhexyl phosphoric acid P204, 2‐ethylhexyl phosphoric acid mono‐2‐ethylhexyl ester P507, di‐2‐ethylhexyl phosphinic acid P229, and sec‐nonylphenoxy acetic acid CA‐100), neutral organic extractant (tri‐n‐butyl phosphate TBP, di‐(1‐metylheptyl)metyl phosphate P350, and branched trialkylphosphinic oxide Cyanex 925) or primary amine N1923, has been investigated in this paper. The extractability and separation ability for the Ho, Y, and Er with the mixtures of Cyanex 302 and organic extractants has been compared. The synergistic effect of the Ho, Y, and Er extraction with the mixtures of Cyanex 302 and P229, Cyanex 925, CA‐100, or N1923 has been explored and the synergistic enhancement coefficients have been calculated. At last, the Y³⁺ synergistic extraction with the mixtures of Cyanex 302 and CA‐100 has been determined and the extracted complex has been deduced.     

烤烟硅肥肥效及施用量的研究

本文以省内８个产烟县统一硅肥肥效试验结果中的产量及产值为依据，分别进行了各点试验及其同质检验试验的变量分析，其中多数试验的处理Ｆ值都达到显著标准。硅肥对烤烟增产增值是有效的，可信的，应注意因地制宜施用具佳施硅量。硅肥增产增值原因在于促进烤烟生长，增加叶面积及其指数，以及缓解烤烟病害，特别是炭疽病害，因而提高了烤烟中上等烟的比例。     

Differences in Leaf Morphology and Related Gene Expression between Diploid and Tetraploid Birch (Betula pendula)

Plant polyploidization changes its leaf morphology and leaf development patterns. Understanding changes in leaf morphology and development patterns is a prerequisite and key to studying leaf development in polyploid plants. In this study, we quantified and analyzed the differences in leaf morphology, leaf growth polarity, and leaf size between diploid and tetraploid birches (Betula pendula subsp. pendula), and preliminarily investigated genes involved in leaf growth and development in birch. The results showed significant changes in leaf morphology in tetraploid birches, especially the basal part of the leaf. In addition, the proximal growth rate of tetraploid leaves was altered. The changed proximal growth rate did not affect the growth polarity pattern of tetraploid leaves. The leaf area of tetraploid was significantly larger than that of diploid birch. The difference in leaf size was mainly due to differences in their growth rates in the middle and late stages of leaf development. Increased cell expansion capacity was the major reason for the enormous leaves of tetraploid birch; however, cell proliferation did not contribute to the larger tetraploid leaf. The gene expression of ATHB12 was associated with cell size and leaf area, and may be a critical gene affecting the leaf size in diploid and tetraploid birches. The results will provide valuable insights into plant polyploid leaf development and a theoretical basis for later investigations into the molecular mechanisms underlying the gigantism of tetraploid birch leaves.