本加

In this thesis, we developed a new method to construct 2, 3, 6-trisubstituted piperidines using enantiopure -amino acid derivatives as the starting material and applied them to the synthesis of some piperidine alkaloids which showed interesting physiological activities.

本论文中，我们从非手性原料出发，通过手性胺对、(-不饱和酯的Michael加成来获得光学纯的-氨基酸酯，发展了一种构建2、3、6-三取代哌啶环的方法，并利用这种方法合成了一些具有重要生理活性的生物碱类天然产物。

Since start years of 2000, all staff Relies on is engaged in the building materials development, the production and the application experience for a long time and Promotes the Low-price quality merchandise, the use unceasingly is reliable, has the international advanced level the many kinds of new building materials machinery,Like HLQ5-30 completely automatic artificial brick shaper, HL-125C automatic cement roof tile forming machine, The wheel grinds the mixer,Planet and the wheel grinds the mixer, HL-T5 completely automatic spraying machine,Terrazzo polishing enginecement brick machine Etc, At the same time the necessary production each kind of concrete sur-medicinal preparation and the shop help the material.

自2000年开办以来，本公司全体员工凭借长期从事建材开发、生产和应用中的经验，不断推出价廉物美、使用可靠、具有国际先进水平的多种新型建材机械如HLQ5-30系列型全自动混凝土砌块成型机、HL-125C系列模压式水泥瓦成型机、轮碾搅拌机、行星加轮碾搅拌机、HL-T5型全自动喷涂机、水磨石磨光机等。同时配套生产各种混凝土外加剂及辅助材料。

National monopoly product,Like HLQ5-30 completely automatic artificial brick shaper, HL-125C automatic cement roof tile forming machine, The wheel grinds the mixer,Planet and the wheel grinds the mixer, HL-T5 completely automatic spraying machine,Terrazzo polishing enginecement brick machine Etc, At the same time the necessary production each kind of concrete sur-medicinal preparation and the shop help the material.

自2000年开办以来，本公司全体员工凭借长期从事建材开发、生产和应用中的经验，不断推出价廉物美、使用可靠、具有国际先进水平的多种新型建材机械如HLQ5-30系列型全自动混凝土砌块成型机、HL-125C系列模压式水泥瓦成型机、轮碾搅拌机、行星加轮碾搅拌机、HL-T5型全自动喷涂机、水磨石磨光机等。

A mixed catalyst of reforming catalyst and potassium carbonate is also used in this study. However, there is no significant improvement in either the gas yield or composition.

在本研究中也曾将蒸气重组触媒与碳酸钾触媒混合使用，但并没有显著的加成效果。

Milan pose at the Prater stadium in Vienna ahead of the final on May 23, 1990, Milan-BenficaMilan pose at the Camp Nou in Barcelona ahead of the final on May 24,1989, Milan-Steaua

在经历了50和60年代的三次欧战决赛后，米兰在20年后回到了欧洲之巅，连续两年进入决赛分别战胜布加勒斯特星队和本菲卡队

This experiment was conducted to study the effects of predigestion with enzyme on the performance, egg quality and metabolic rate of dietary nutrients in laying hens.

本试验旨在研究加酶预消化饲料对蛋鸡生产性能、蛋品质及养分表观代谢率的影响。

So saying, with dispatchful looks in haste She turns, on hospitable thoughts intent What choice to chuse for delicacie best, What order, so contriv'd as not to mix Tastes, not well joynd, inelegant, but bring [ 335 ] Taste after taste upheld with kindliest change, Bestirs her then, and from each tender stalk Whatever Earth all-bearing Mother yields In India East or West, or middle shoare In Pontus or the Punic Coast, or where [ 340 ] Alcinous reign'd, fruit of all kindes, in coate, Rough, or smooth rin'd, or bearded husk, or shell She gathers, Tribute large, and on the board Heaps with unsparing hand; for drink the Grape She crushes, inoffensive moust, and meathes [ 345 ] From many a berrie, and from sweet kernels prest She tempers dulcet creams, nor these to hold Wants her fit vessels pure, then strews the ground With Rose and Odours from the shrub unfum'd.

Neerer his presence Adam though not awd， Yet with submiss approach and reverence meek， As to a superior Nature， bowing low， [ 360 ] 她一边说着，一边带着急迫的神情，急速转身，一心想着招待的事，怎样精选最上等最可口的东西，风味若不调和，便会变得粗劣，务必要按照自然的变化而加调味，一样接着一样，有条不紊，引人入胜；于是忙着去采集各种的果品，从大地母亲所生产的万汇中千挑万选，无论东西印度、地中海滨各国、本都、布匿沿岸或阿西诺斯国中的，样样都有，结在柔枝上的，有果皮光滑的，粗糙的，果壳带须的，包在荚里的，她都不吝惜地采摘，堆积在桌子上。

On encryption layer,exchange of private keys based on prime field GF(p=2192-264-1), ELGamal encryption and elliptic curve digital signature are performed.

综上所述，本论文所作的主要工作有：(1)对目前应用较广的公钥密码体制RSA和ECC算法及加解密实现进行比较。

The invention relates to a method for producing pyridoxine and the acid addition salts thereof, said method comprising the following steps: i.

本发明涉及一种制备吡哆素和其酸加成盐的方法，该方法包括：i。

Such factors, coupled with the ECB's likely tightening move in Q2, would underpin a strong Euro for the rest of the quarter.

因有以上利好因素加上欧洲央行很大可能在第2 季加息，预期欧元在本季将维持强势。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。