茴香酸甲酯的合成

从茴香油生产茴香醛的废渣、废液中提取副产品茴香酸，合成茴香酸甲酯。对合成条件进行了研究，取得了满意的结果。     

茴香醛与茴香酸对蘑菇酪氨酸酶单酚酶的抑制作用

酪氨酸酶是生物体合成黑色素的关键酶.研究了茴香醛和茴香酸对蘑菇酪氨酸酶单酚酶活力的影响和抑制作用,结果表明:茴香醛对蘑菇酪氨酸酶单酚酶活力的影响表现为对酶稳态活力的抑制作用,茴香酸除了影响酶稳态活力外对迟滞时间还有延长作用.3.0 mmol/L的茴香醛使得单酚酶的稳态酶活力下降70.5%,对迟滞时间几乎没有影响;相比之下,3.0 mmol/L的茴香酸可以使单酚酶活力下降38.8%,并使迟滞时间从114 s延长到218 s.通过研究茴香醛和茴香酸对蘑菇酪氨酸酶的抑制作用机理,为进一步研究设计新型酪氨酸酶抑制剂奠定基础.     

高锰酸钾氧化茴脑制备茴香酸的工艺研究

为了有效的利用自然资源,降低生产成本,以茴脑为原料,高锰酸钾做氧化剂,四丁基溴化铵(TBAB)为相转移催化剂,通过氧化合成了茴香酸。结果表明,最佳反应条件为:n(茴脑)∶n(高锰酸钾)∶n(TBAB)=1∶2.2∶0.002,反应温度为85～90℃,反应时间为6 h,产率可达85.8%。产物结构经1HNMR,MS确证。研究结果为工业化生产茴香酸奠定了基础。     

羌活中有效成分4-羟基苯乙基茴香酸酯的全合成

从4－羟基苯甲酸和4－羟基苯乙酸甲酯出发,经6步反应首次合成了中草药羌活中的一个天然化合物－4－羟基苯乙基茴香酸酯及其相关的中间体,其分子结构得到元素分析,红外,1H＿NMR和MS等光谱数据证实。     

无水三氯化稀土催化Friedel-Crafts 烷基化反应的研究(Ⅰ)

用无水二氯化稀土作为Lewis酸，催化对－甲氧基苯酚与2－氯－2－甲基丙烷的Friedel-Crafts烷基化反应，合成了食品添加剂3－叔丁基－4－羟基茴香醚。     

甲醇法合成对羟基茴香醚

对羟基茴香醚是高分子工业广泛应用的阻化剂之一,合成方法较多。本文研究甲醇法合成对羟基茴香醚,对工艺作了改进,方法简单,收率高。     

稀土与对-茴香酸配合物的合成与性质

本文合成了通式为ＲＥＬ３（ＲＥ３＋＝Ｐｒ３＋、Ｓｍ３＋、Ｔｂ３＋,,Ｌ＝对茴香酸根）的二元配合物．用元素分析、电导、ＩＲ、ＵＶ、ＴＧＤＴＡ等对其结构和性质进行了表征．该类配合物属桥式双齿配位     

碘掺杂聚二茂铁-茴香醛的合成与表征

采用液相掺杂法合成了碘掺杂的聚二茂铁-茴香醛,通过红外光谱和热分析(TCA、DSC)对合成产物进行了分析表征,探讨了掺杂前后聚二茂铁-茴香醛的红外光谱和热稳定性的变化．结果表明碘掺杂后聚二茂铁-茴香醛的红外光谱与本体聚二茂铁-茴香醛的红外光谱相比,虽然主峰位置没有明显的变化,但吸收峰合并,谱峰数目大大减少,吸收强度大大减弱,随着掺入的碘量的增加,吸收率有所增加;碘掺杂聚二茂铁-茴香醛的热稳定性与聚二茂铁-茴香醛相比,低温耐热性能下降,而高温(300℃以上)耐热性却无明显的影响。     

日光温室球茎茴香栽培技术

球茎茴香又称结球茴香、甜茴香、意大利茴香，属伞形科茴香属的一个变种，为草本植物。由于它富含营养物质，质地脆嫩，口感好，且具有芳香味，深受广大市民的青睐。冬季生产春节上市的球茎茴香不仅满足了节日市场．增加花色，而且还可为菜农增加收入。     

稀土与对-茴香酸配合物的合成与性质

本文合成了通式为REL3(RE^3 =Pr^3-、Sm^3 、Tb^3 ，L=对-茴香酸根)的二元配合物用元素分析、电导、IR、UV、TG-DTA等对其结构和性质进行了表征．该类配合物属桥式双齿配位。     

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.     

An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

大肠杆菌pheA与tyrB基因的克隆与串联表达

为探讨用基因工程的手段改良苯丙氨酸的发酵菌株，采用聚合酶链反应（ＰＣＲ）的方法，从大肠杆菌总ＤＮＡ中克隆得到了编码苯丙氨酸合成途中的两个关键酶基因－即分枝酸变位酶（ＣＭ）／预苯酸脱水酶（ＰＤ）基因ｐｈｅＡ与苯丙氨酸转氨酶（ＰＡＴ）基因ｔｙｒＢ，在大肠杆菌中进行了这两个基因的单个和串联表达。ｐｈｅＡ和ｔｙｒＢ基因分别都能在λ噬菌体的ＰＲ启动子之后得到较大量的表达，在ＳＤＳ－ＰＡＧＥ上出现清晰的条带，     

四川溲疏属的分类研究 （Ⅱ）：种的简介及新分类群

介绍了四川溲疏属植物20种,5变种及1栽培变型,每种均有文献考证、学名订正、特征集要及产地和生境,新分类群D.leiboeneie P.He et L.C.Hu, D.piloea var.longiloba P.He et L.C.Hu,D.jinyangensis P.He eL L.C.Hu及D.longifolia var.deneitomentosa P.He et L.C.Hu均有详细拉丁文描述并附模式标本照片,还记录了两个四川省新分布种:D.bodiaieri Rehd.,D.rehderiana C.K.Schn.,对伞花亚组Subsect Cymosae Rehd.中建立的新系(Ser.Multiradiatae P.He,Ser.Pauciradiatae P.He)作了拉丁文补充描述。     

在Java技术之Servlet中实现文件的上载功能

Java这门编程语言以及相关技术的使用得到快速的增长;现在大约有700多万台计算机正在运行Java应用程序,有近100万的Java开发人员,世界上所有的企业中,几乎有一半正在开发 Java应用程序。Java成功的理由是很自然的,Java是真正与平台无关的,它是适合于任何操作系统的一种通用的编程语言;Java是完全面向对象的,这在软件工程和组件技术方面有了很大的进步;Java的安全模型是成熟的,这与其他容易感染病毒的模型系统形成了鲜明的对比。     

中国阳蝇属六异名记述(双翅目:蝇科)

阳蝇属是蝇科最大的属之一,迄今全世界已知阳蝇属约666种,分布于世界各大地理区。近年来对阳蝇属种团和类群的研究,发现在我国阳蝇属中存在一些异名问题。在我国阳蝇属已知226种中,发现小兴安阳蝇(Helina xiaoxinganna Xue,2001)、茂县阳蝇(Helina maoxianica Feng,2008)、后曲阳蝇(Helina postiflexa Xue,Feng& Tong,2008)、团宝山阳蝇(Helina tuanbaoshanica Feng,2007)、兴凯阳蝇(Helina xingkaihuica Feng& Ye,2007)和错那阳蝇(Helinacuonaica Feng&Xu,2008)等6个种存在同物异名问题,并根据模式标本及原始文献,指出了同物异名的理由,明确给予了订正。     

采用有限差分方法求解固体弹性应力场(英文)

为了采用全有限差分方法进行涡轮气热弹耦合计算,研究了固体弹性应力场计算的物理模型,给出了任意曲线坐标系下的控制方程.同时研究了定常问题的有限差分求解方法和边界条件的给定,编制了定常问题的应力场求解程序;并通过对具有解析解的受集中载荷的悬臂梁和一端受径向集中力的曲梁进行数值计算来验证该固体弹性应力场的求解方法.结果表明,边界条件的二阶精度处理的格式所得结果与解析解数据吻合得较好,而一阶精度格式结果与解析解有较大的误差.     

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.     

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     

中国耳孔蜈蚣属(蜈蚣目:蜈蚣科)部分种类研究

记述我国蜈蚣目Scolopendromorph耳孔蜈蚣亚科Otosigminae耳孔蜈蚣属Otostigmus(耳孔蜈蚣亚属Otostigmus)6种.其中对平耳孔蜈蚣Otostigmus(Otostigmuts)politus Karsch、糙耳孔蜈蚣O.(O.)scaber Porat和多刺耳孔蜈蚣O.(O.)aculeatus Hasse进行了重新描述;马氏耳孔蜈蚣O.(O.)martensi Lewis和贝氏耳孔蜈蚣O.(O.)beroni Lewis为2个我国新记录;刘易斯耳孔蜈蚣O.(O.)lewisi sp.nov.为1新种.附有各种特征图,并编制了种检索表.