薄层扫描法测定延胡索中延胡索乙素含量

采用薄层扫描法测定药材延胡索中延胡索乙素的含量．以石油醚(60～90℃)-醋酸乙酯-无水乙醇(20：17：1)为展开剂，检测波长为510nm．参比波长为600nm，Sx=3，标准曲线Y=1．098X 1．0645，r=0．9973．线性范围0．507～2．535μg，平均回收率98．0％，RSD=2．1％。     

七星瓢虫对百合桃蚜的捕食功能反应

研究了七星瓢虫幼虫及成虫对百合桃蚜的捕食功能反应。结果表明，其功能反应均属HollingⅡ型，各龄幼虫及成虫捕食功能反应模型为：Na1=0．825764Nt／(1 0．014539Nt)，Na2=1．062573Nt／(1 0．013029Nt)，Na3=0．989489Nt／(1 0．002242Nt)，Na4=1．020385Nt／(1 0．001442Nt)，Na5=1．054937N．t(1 0．001033Nt)，日最大捕食量依次为56．8头、81．6头、441．3头、707．7头和1021．5头。     

80例弥漫性恶性胸膜间皮瘤的肿瘤分期

目的：探讨弥漫性恶性胸膜间皮瘤的肿瘤分期可行性。方法：用统计学方法处理1990至2000年间80例弥漫性恶性胸膜间皮瘤的术后生存时间和预后因素，分析国际抗癌联盟(Union International Centre le Cancer，UICC)所推荐的弥漫性恶性胸膜间皮瘤的TNM分期方法的可行性，生存时间采用生命表法。结果：80例弥漫性恶性胸膜间皮瘤患者的中位术后生存时间为13．6个月(范围1～78个月)，1、2和3年生存率分别为54．4％、28．7％和12．4％。在单因素生存分析中，Ⅰ期、Ⅱ期以及Ⅲ Ⅳ期之间的预后有显著性差异(P=0．016)；同时，T1、T2以及T3 T4之间也有显著性差异(P=0．009)。在多因素Cox回归分析模型中，左侧肿瘤(P=0．026)、没有胸痛(P=0．013)、上皮型肿瘤(P=0．029)和早期肿瘤(P=0．001)的预后较好。结论：UICC所推荐的弥漫性恶性胸膜间皮瘤的TNM分期法可在临床中推广应用。     

天山花楸中总黄酮和槲皮素测定

以芦丁、槲皮素为标准品建立了用分光光度法测定天山花楸叶中总黄酮的含量和果实中槲皮素含量的测定方法，分别采用5％ NaNO2～10％Al（NO3）3～4％NaOH和2％AlCl3显色系统，并分别在510nm和422nm处进行了含量测定。结果表明：天山花楸果实中总黄酮为7．75％（RSD％=1．09），在1．596～6．384mg／100mL（R^2=0．9999）范围内，线性关系良好；7月天山花楸叶子中槲皮素为0．777％（RSD％=0．66）、8月其叶子中槲皮素为0．397％（RSD％=0．81），叶子中槲皮素在0．241～0．723mg／100mL（R^2=0．9995）范围内，线性关系良好。     

苯基氮杂-15-冠-5-八钼多酸钠超分子配合物的结构与热分解

本文对新型超分子配合物[Na(N-Ph)15C5(Et2O)]2Na2Mo8O26拍进行了X-射线四园衍射测定,该晶体属单斜晶系，空间群为P2t／c．a=1．7803(4)，b=1．3674(3)，c=1．4610(3)，β=112.33(2)．V=3．290(1)nm^3．Mr=2021.3，Dc=2.14g／cm^3，μ=1.71mm-1，F(000)=2079.63，R=0．0256和Rw=0．0295．并联系差热-热重分析和^1HNMR实验，讨论了配合物的热分解过程。     

液态橙汁乳配方的筛选试验

采用正交二次旋转组合设计筛选出液态橙汁乳的最佳配方为：橙汁11．5％，有机酸0．17％，白砂糖3％，稳定剂0．17％（羧甲基纤维素钠：藻酸丙二醇酯=2：3），磷酸盐0．24％（多聚磷酸盐：焦磷酸盐=1：1），牛乳76．42％，水8％，脱脂乳粉0．64％。     

交酯化法合成乌桕脂肪酸乙酯

采用正交实验方法研究乌桕脂与乙醇的脂交换的转化率。当氢氧化钠催化剂为0．4％(脂重)，反应温度为75℃，反应时间为3小时，乙醇：乌桕脂=6：1(m01)的条件下，乙酯转化率为97．88％。     

莱菔子中总黄酮和多糖的微波提取与含量测定

运用微波技术提取莱菔子总黄酮和多糖,用比色法测定总黄酮和多糖含量。结果表明：莱菔子中总黄酮含量为0．60％,平均回收率为100．3％,RSD=1．04％(n=5)。多糖含量为12．73％,平均回收率为101．54％．RSD：0．46％(n=5)。运用微波技术从莱菔子中联合提取总黄酮和多糖,其反应速度加快,提取效率提高。     

催化氧化法处理对氯硝基苯(PCNB)废水的研究

以活性炭为催化剂，H2O2作氧化剂催化氧化降解对氯硝基苯(PCNB)，结果表明，在H2O2／CODcr=1．2，活性炭／H2O2=0．4，pH=3．0的条件下，反应可在180min结束，PCNB的去除率高于99％，CODcr去除率可达80％，与Fenton试剂法相比较，CODcr去除率提高1．78倍，并对降解机理作了初步讨论。     

10月龄非洲鸵鸟胴体性状的测定及其相关性研究

对饲养于陕西关中地区的23只10月龄非洲鸵鸟胴体性状进行测定及其相关回归研究．结果表明,屠宰率平均为0．785 9±0．018 1％;半净膛率平均为0．904 9±0．012 6％,全净膛率平均为 0．712 5±0．027 7％．10月龄非洲鸵鸟体重与体尺之间回归方程:Y=-52．155 07 0．701X1- 0．166X2 2．879X3(n=23,R2=0．643 418,0．05相似文献   

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

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.     

A computer generator for randomly layered structures

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

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.     

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.