香桂叶油合成二氢黄樟油素

以香桂叶油为原料合成二氢黄樟油素为目的，在W-2型瑞尼镍的催化下加氢，并研究了催化剂用量、温度、压力和溶剂对反应的影响。结果表明：香桂叶油在无溶剂条件下。用32：1的W-2型瑞尼镍催化，在120℃、2MPa的氢气压力下反应2h，可合成二氢黄樟油素，不经过蒸馏提纯，质量分数为98．5％，产率为95．6％，无废水和废渣排放。     

氯甲基二氢黄樟油素的绿色合成新方法

报道了一种绿色合成甲基二氢黄樟油素的新方法,1．00mol（含量95．1％,来自香桂叶油）二氢横樟油素、1．40mol（含量95％）多聚甲醛和360moL36％盐酸,在70℃,剧烈搅拌7h,得到氯甲基二氢黄樟油素（含量93．4％以上）,产率98．6％,氯甲基化反应的废水经过处理可以回收盐酸,CODCr降到62mg/L,色度降到40倍,pH变为9。     

洋洋莉醛开发应用商机喜人开发应用商机喜人

洋茉莉醛,又名胡椒醛,外观为具有洋茉莉花香的白色或黄白色闪光结晶,其天然品少量存在于洋茉莉花、刺槐花等花油和香荚豆等植物中.洋茉莉醛的生产通常以从黄樟树水蒸气蒸馏得到的黄樟油素为起始原料,与氢氧化钾共热转化为异黄樟油素,经氧化、苯萃取、中和洗涤、常压蒸苯、乙醇结晶等工序后得洋茉莉醛成品.国内厂家目前大多以黄樟油素为原料生产.有关研究单位现已开始研制以邻苯二酚为起始原料,经亚甲基化、酸化、氧化脱羧三步反应合成洋茉莉醛的生产新工艺.     

异黄樟油素液相氧化合成洋茉莉醛的研究

通过不同条件下的实验，得出由异黄樟油素液相氧化合成洋茉莉醛的适宜工艺条件．＿当异黄樟油素与高锰酸钾的重量比为１∶１时，向混合液中滴加酸，并通入氧气，在７０℃下反应２．５ｈ，醛得率为４３．３％．     

洋茉莉醛电化制备电极过程的研究

本文用循环伏安法、稳态电势扫描法及微分电容法,研究了由异黄樟油素经两次电氧化制备洋茉莉醛时的电极过程.根据实验结果,认为第一次电氧化是异黄樟油索的环氧化过程,属于EECC机理;第二次是环氧化物的水解产物(双醇化物)的电氧化得到洋茉莉醛.     

香桂扦插育苗试验

香桂（Cinnamomum Petrophilum Nchao）,是我县特有的香料经济树种,广泛分布于我县岩溶区域,其枝、干、叶、皮均可提取芳香油,尤以叶子含油率最高,达3．1-4．36％,香桂油的主要成份为黄樟油素,含量达96．01—99．60％,是目前世界上发现的唯一枝叶含黄樟油素的树种,在国际市场上竞争力极强,列为我县重点发展的经济林树种。     

湘西猴樟油主要化学成份分离研究

本文采用常压间歇精馏法对猴樟油中桉叶油素的分离进行了试验研究.产品馏分中桉叶油素的含量可达到80%(体积),比原油中桉叶油素的含量17.20%(体积)提高了62.80%(体积),已接近国际桉叶油素精油标准,试验结果表明,从湘西猴樟油中分离桉叶油素,不仅易于分离,而且分离效果好.这对于开发湘西天然香料资源无疑是一条新的途径.     

洋茉莉醛开发应用商机喜人

洋茉莉醛,又名胡椒醛,外观为具有洋茉莉花香的白色或黄白色闪光结晶,其天然品少量存在于洋茉莉花、刺槐花等花池和香荚豆等植物中。洋茉莉醛的生产通常以从黄樟树水蒸气蒸馏得到的黄樟油素为起始原料,与氢氧化钾共热转化为异黄榜油素,经氧化、苯苹取、中和洗涤、常压蒸苯、乙醇结晶等工序后得洋茉莉醛成品。国内厂家目前大多以黄樟油素为原料生产。有关研究单位现已开始研制以邻苯二酚为起始原料,经亚甲基化、酸化、氧化脱坡三步反应合成泽茉莉醛的生产新工艺。洋茉莉醛是一种重要的精细化学品和有机合成中间体,在食品、日化、精细化…     

香桂炼油试验

香桂,又称岩桂,俗名三股筋,樟科樟属树种,是我县特有的乡土经济林树种,主要分布于我县古楼、巡司、乐义、镇舟等岩溶区域,其枝、叶、干、皮均可提取芳香油,尤以叶子含油率最高达3．15-4．36％,香桂的主要成份为香樟油素,含量达96．01—99．60（中国科学院成都分院生物研究所分析测定）,是目前世界上发现的唯一枝叶富含黄樟油素的树种。以黄樟油为主要原料制成的洋茉莉醛,广泛应用于日用化工和医药业上,     

樟脑红油化学成分的研究

本文比较详细地研究了樟脑红油(Red Camphor Oil)的化学成分,并估定了它们的含量,为樟脑红油的利用提供了必要的根据。樟脑红油的成分主要为黄樟油素(～22.2%);芳樟醇(～9.2%);α-松油醇(～7.8%);二戊烯(～4.2%);α-蒎烯(～2.8%);樟脑(1.9%);1,8-桉叶油素(～0.8%);倍半萜烃的含量约为14.8%,已鉴定其中含有α-檀香烯和蛇麻烯。另外尚有一种待进一步鉴定的倍半萜烯,它在薄层色谱中的位置处于α-檀香烯与蛇麻烯之间。     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

Perspherical Approaches for Electrons in Atoms and Charged Excitons in Quantum Wells

Instead of following Fock’s expansion,we solve the Schrodinger equation for some quantum mechanical manybody systems such as electrons in atoms and charged excitons in quantum wells in a similar way in hyperspherical coordinates by expanding the wave functions into orthonormal complete basis sets of the hyperspherical hannonics(HHs)of hyperangles and generalized Laguerre polynomials(GLPs)of the hyperradius.This leads the equation to     

Advances in broadband wireless communications under high-mobility scenarios

Future mobile communication systems aim at providing very high data transmission rates, even in high-mobility scenarios such as high-speed wheel-track trains, maglev trains, highway vehicles, airplanes, guided missiles or spacecraft. A particularly important commercial application is the strong and increasing worldwide demand for high- speed broadband wireless communications （up to 574.8 km/ h test speeds or 380 km/h commercial speeds） in railways, providing data, voice and video services for applications such as onboard entertainment services to passengers, train control, train dispatch, train sensor status handling and sur- veillance. In such high-mobility scenarios, there are a number of communication challenges, including fast hand- over, location updating, high-speed channel modeling, estimation and equalization, anti-Doppler spreading tech- niques, fast power control, and dedicated network architec- ture. Because signal transmission in very high-speed scenarios will inevitably experience serious deterioration, it is imperative to develop key broadband mobile communi- cation techniques for such high-speed vehicles.     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

<正>~~     

Scale-based spatial data model for GIS

Being the primary media of geographical information and the elementary objects manipulated, almost all of maps adopt the layer-based model to represent geographic information in the existent GIS. However, it is difficult to extend the map represented in layer-based model. Furthermore, in Web-Based GIS, It is slow to transmit the spatial data for map viewing. In this paper, for solving the questions above, we have proposed a new method for representing the spatial data. That is scale-based model. In this model we represent maps in three levels: scale-view, block, and spatial object, and organize the maps in a set of map layers, named Scale-View, which associates some given scales.Lastly, a prototype Web-Based GIS using the proposed spatial data representation is described briefly.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to