中亚紫菀木化学成分的研究

从中亚紫菀木中分离出１０种化合物，经光谱及化学方法鉴定为乙酰羽扇豆甾醇、木栓酮、木栓醇、β－谷甾醇、菠苗醇－３－葡萄糖甙、东莨菪素－７－β－葡萄糖甙、槲皮素、槲皮素－３－β－半乳糖甙、４－阿魏酰硅宁酸、贝萼宁－３－葡萄糖甙。     

半卧狗娃花中的三萜及甾体化合物

从半卧狗娃花(Heteropappus semiprostGriers)全草的乙醇提取物中分离得到了8个三萜及甾体化合物,经红外光谱(IR),质谱(MS),核磁共振谱(NMR)分析及结合标样对照鉴定了它们的结构,分别为:木栓烷-3β-醇-27-酸(1),木栓酮(2),达玛烷-20,24-二烯-3β-醇(3),达玛烷-20,24-二烯-3β-乙酰基(4),α-波甾醇(5),大戟二烯醇(6),β-谷甾醇(7),豆甾醇(8).除了(2)和(7)外,其余化合物均为首次从本属植物中分离得到.     

霸王鞭化学成分研究

采用硅胶柱色谱及HPLC等分离方法对新鲜霸王鞭的乙酸乙酯提取物进行分离纯化,得到8个单体化合物,通过1H NMR和13C NMR的方式鉴出其结构分别为蒲公英赛醇(1),大戟醇(2),木栓酮(3),乙酰表木栓醇(4),西米杜鹃醇(5),α-菠甾醇(6),山柰酚-3-O-α-L-鼠李糖甙(7),槲皮素-3-O-α-L-鼠李糖甙(8)。化合物4,5,7,8为首次从霸王鞭中分离得到。     

从植物中录找农药活性物质（Ⅲ）：紫茎泽兰化学成分…

从菊科泽兰属植物紫茎泽兰茎中分到５个化合物，通过ＩＲ、ＭＳ、＾１ＨＮＭＲ，＾１３ＣＮＭＲ，＾１３ＣＮＭＲ－ＤＥＰＴ、元素分析等手段，单体分别鉴定为表木栓醇（１），豆甾醇（２），正二十八烷酸（３），β－胡罗卜甙（４），２－异丙烯基－５－乙酰基－６－羟基苯骈呋喃的乙酰化物（５），邻羟基桂皮酸（６），除豆甾醇外，其余的化合物都是首次在紫茎泽兰中发现。     

还阳参化学成分及生物活性研究

研究还阳参crepis tectorum linn.全草的化学成分。采用硅胶柱色谱、HPLC色谱等方法分离纯化,对还阳参浸膏进行化学成分的分离,根据理化性质和波谱数据进行结构鉴定。从还阳参提取物中分离得到了5个化合物,分别鉴定为:β-谷甾醇(β-sitosterol,1)、豆甾醇(stimastero,2)、羽扇豆酮(lupenone,3)、木栓酮(friedelin,4)、伪蒲公英甾醇乙酸酯(ω-taraxasteryl acetate,5)。化合物3为该植物中首次分离得到。正丁醇层提取物对玉米小斑病菌、玉米大斑病菌、草莓灰霉病菌有抑制作用。     

霸王鞭化学成分研究

霸王鞭系大戟科大戟属植物,民间药用,具散瘀消炎、清热解毒之功效.通过使用多种分离手段和波谱技术,从该种植物氯仿萃取物中分离鉴定了五个化合物:木栓酮(friedelin,I),无羁萜醇(friedelanol,Ⅱ),β-谷甾醇(β-sitosterol,III),豆甾醇(stigm asterol,Ⅳ),胡萝卜甙(daucosterol,V).     

独籽藤中木栓烷类型三萜成分研究

从云南产的独籽南蛇藤（Ｃ．ｍｏｎｏｓｐｅｒｍｕｓＲｏｘｂ．）根皮中共分到３０－羟基－木栓酮,２９－羟基－木栓酮,１２β－羟基－木栓酮,３－氧－木栓烷－３０羧酸等４个木栓烷型三萜化合物和１个甾体化合物．这些化合物的结构都通过波谱方法进行了鉴定．     

重结晶法精制植物甾醇的溶剂选择

以甲醇酯化、冷却结晶工艺从油脂脱臭馏出物中分离制得的植物甾醇粗品为研究体系,探讨了精制植物甾醇在不同溶剂中的溶解特性和植物甾醇粗品在不同溶剂中的结晶、分离特性。实验结果表明,正丙醇、正丁醇、正戊醇、丙酮和环己酮适宜用作粗植物甾醇重结晶分离提纯的溶剂。该研究为植物甾醇粗品的重结晶法精制过程工业化中溶剂的选择提供了基础数据。     

从米糠油的甲醇碱液皂渣中提取谷甾醇方法的研究

β—谷甾醇广泛地分布于植物界,是最常见的植物甾醇之一。它已从玉米油、棉子油、米糠油、麦芽油、葵花子油等植物油脂的不皂化部分中分离出;很多中草药中也证明含有β—谷甾醇。从植物中提取的β—谷甾醇一般为多种植物甾醇的混和物,例如,从米糠油中提取的β—谷甾醇,还含有一定量的豆甾醇、芸苔甾醇、二氢化谷甾醇以及β—谷甾醇的异构体等植物甾醇。     

紫外标记植物甾醇的高效液相色谱分离

植物甾醇是植物油非皂化物的主要成分,其中以C_29甾醇的含量为最高。植物油中甾醇成分的测定一般采用气相色谱法,但是由于甾醇及其衍生物难于气化,此法往往需要较高柱温。近年来,采用高效液相色谱法分离植物甾醇及其衍生物已有报导。我们采用对硝基苯甲酰氯对植物甾醇的紫外标记法,将六种常见的C_29植物甾醇进行反相HPLC分离,得到较为满意的结果。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

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

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.