碳化作用

Transformation process and microstructure in 675 armor steel continuously cooled at a series of different rates were investigated using a high-resolution dilatometer,along with optical and transmission electron microscope.

675装甲钢是一种中碳高强度低合金钢，是在685装甲钢成分基础上加入少量V进行微合金化而得到的，其所含主要合金元素有Ni、Mo、Cr和V，其中Ni、Mo、er主要是强化铁素体和提高淬透性，V主要起沉淀强化和细化晶粒的作用。

But because of tillage, soil penetration is enhanced, mineralization and eluviation are also enforced, resulting in lose of soil organic matters and NO3-N by mineralization or eluviation, at last reducing the absorption amount of carbon in the soil.

但由于草地翻耕后，土壤孔隙度和通透性增强，土壤的矿化作用和淋溶作用也增强，导致了有机质的矿化丧失和NO3-N淋溶丧失，减少了土壤中碳的吸收量。

A long-term combinition of organic manure with chemical fertilizers could improve the humification of soil humus, enhance the activity of humus, reduce the antioxidization ability of soil organic carbon, and increase the nutrient-supplying capacity, so was the best fertilization model for maintaining the soil fertility.

长期有机肥与化肥配施，对改善土壤腐殖质的腐殖化程度和提高其活性，降低土壤有机碳的抗氧化能力，提高土壤养分供应能力具有良好的作用，是保持土壤肥力的最优施肥方式。

We suggested that the sorption of P to soil minerals must to be taken into account in the future research.

结果建议，在研究P对土壤有机碳氮矿化过程时应充分考虑土壤对P的吸附作用。

During these years (1997-2000) in the research area of annonaceous acetogenins 5 natural products and a number of chiral-pure analogs of annonaceous acetogenins have been synthesized using sugars as the starting materials. Their high activity and selectivity against cell line of colon tumor and a relationship between activity and configuration have been found too. In the respect of inhibitor of sialidase two new methodologies for the synthesis of chiral-pure 3-deoxy-ulosonic acid using hetero-Diels-Alder reaction or asymmetric propargylation as the key reaction were developed. On the topic of anti-leukemia marine natural product clavulactone a synthetic method based on the free radical cyclization and starting from sugar has been developed. In other title of PKC inhibited agent sphingosine a new synthetic route with SN2' as the key reaction has also been disclosed.

项目期间（1997-2000）在番荔枝内酯方面从糖出发合成了五个天然产物和一批手性纯的类似物，它们对肠癌细胞有很高的活性和选择性，并与构型有关；在唾液酸酶抑制剂方面发展了二类全新手性纯高碳糖的合成方法－杂原子D－A反应或丙炔基不对称加成为关键的反应；抗白血病海洋天然产物群柱虫内酯方面研究了由糖出发和自由基环化反应的合成方法；对PKC 起抑制作用的鞘氨醇方面也开创了新的合成途径－由糖出发并以SN2'反应为关键反应。

The effects of high-energy ball milling Including the fining and mechanochemical on the carbothermal reduction nitridation of alumine were investigated.

研究了高能球磨氧化铝的细化和机械力化学作用及球磨对碳热还原反应合成氮化铝的影响。

Was synthesized from cyanoacetic acid and diethylamine via DCC coupling under mild conditions.

中间体5 的制备由氰基乙酸在二环己基碳二亚胺作用下经酰胺化一步制得，条件温和，收率较高，避免使用剧毒的氰化钠。

The reaction barrier will be lowered by the substituents that delocalize the unpair electron in p z orbital of the central carbon atom.

R1和R2位置上取代基对α-氢转移反应势垒的影响取决于取代基对过渡态中碳原子的未参与sp2杂化的p z 轨道上单电子的离域作用。

Objective To investigate the effects of perfluorochemical on in vitro long-term hypothermic heart preservation in rats.

目的 研究全氟化碳化合物在大鼠离体心脏长时程低温保存中的作用。

Methods Activate groups A and C meningococcal polysaccharide with cyanogens bromide and prepare into MenAPS-ADH and MenCPS-ADH derivatives by reacting with 1, 6-adipic acid dihydrazine. Mix MenAPS-ADH and MenCPS-ADH derivatives with purified tetanus toxoid at a certain mass ratio, then add l-ethyl-3(3-dimethylaminopropyl)-carbodiimide to prepare bulks of MenAPS-TT and MenCPS-TT conjugates respectively. Mix the two bulks at a certain ratio, add stabilizer and lyophilize to prepare group A+C meningococcal polysaccharide conjugate vaccine.

A群和C群脑膜炎球菌多糖在溴化氰的活化下，以1，6己二酰肼作为连接子，与精制破伤风类毒素在碳二亚胺作用下结合，再按一定的比例将两者混合，制成A+C群脑膜炎球菌多糖结合疫苗原液，加保护剂冻干后，制成A+C群脑膜炎球菌多糖结合疫苗。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。