碳

Through testing 45 carbonate samples collected from PermoCarboniferous caol measures of the Hedong coalfield,the distributions characteristics of carbon and oxygen isotopes in sequences are analyzed,whose feasibilities for sequence subdivision and correlation,as well as for study of relative sea level variations and late Paleozoic facies are also discussed.

系统分析了河东煤田上石炭统（C2）—下二叠统下部（P11）45个碳酸盐岩样品的碳氧同位素在层序中的分布特征，探讨了碳氧同位素应用于层序划分及对比、相对海平面变化研究及晚古生代地层沉积相研究的可能性。

At last, the construstion of C-glycoside by Stille coupling was described, which involved in the use of CuI as catalyst and 4,7-diphenyl-1,10- phenanthroline as ligand was developed.

第5章研究了Stille偶联反应在构筑碳苷中的应用，发展了以CuI为催化剂，4，7-二苯基邻菲罗啉为配体构筑碳苷的方法。

The properties such as high hardness,low friction coefficient,excellent wearability and photics properties,can provide the profound foundation for the application of carbon nitride materials in many fields.

许多研究小组已经合成出具有独特性能的氮化碳，其高硬度、低摩擦系数、良好的耐磨性、较好的光学性质等对氮化碳在广阔领域里的应用提供了坚实的基础。

Visual carbon stars whose mid-infrared spectra are mainly dominated by photospheric continuum and show large excesses at 60um, represent a transition phase which follows an interruption of mass loss from the oxygen-rich phase and begins a new phase of the mass loss of carbon-rich material. Excesses at 60um in these stars are the emission from the residual of oxygen-rich material.

光学碳星的中红外能量主要来自光球，在60μm处存在超量发射，人们认为其演化阶段处在抛射富氧物质终止和新的富碳拱星壳层形成之间，其60μm超量发射就是富氧物质的残余效应。

Effects of different carbon and nitrogen sources, C/N ratio, inorganic salts on the mycelium growth of Pleurotus abalonus were studied.

研究了不同碳源、氮源、碳氮比、无机盐及其不同浓度对鲍鱼侧耳菌丝生长的影响。

As the results show, new type of polycarboxylic acid-based admixture and shrinkage reducer reduce the negative influences of volume shrinkage.

抗碳化研究与分析：本文根据工程实际应用条件主要研究了自密实高性能混凝土的抗碳化能力。

The asymmetric alkynylation of carbonyls is proved to be one of the most powerful procedures for organic synthetic chemistry,where the formation of one carbon-carbon bond and one chiral center of propargylic alcohol can be achieved in one step,and has attracted organic chemists\' most attentions.Plenty of works have been reported in recent years.

由于催化末端炔对羰基化合物的不对称加成在制备手性炔丙醇的同时，能够构建一个碳碳键和一个手性中心，因而该领域的研究受到了研究者的广泛关注，有大量的研究工作见报道。

It is the first example to synthesize Z isomers of propenoic acids and their derivatives highly stereoselectively by the nucleophilic addition of a carbon- carbon triple bonds.

这种利用亲核试剂进攻碳-碳叁键以高立体选择性地合成丙烯酸及其衍生物的方法尚无前例。

Regular coiled carbon tubes are prepared by pyrolytic decomposition of acetylene on titanium plates at 750℃.

规则螺旋碳管的形成与钛片的预处理有关，在盐酸处理过的钛片表面上所生长的碳管几乎都是规则螺旋形状的。

Synthesis with carbocyclic compounds, such as cyclodienylsilane, quinic acid and norbornene etc, as starting materials is discussed in detail.

重点介绍了以环二烯基硅烷、奎宁酸、降冰片烯等碳环化合物为原料合成碳环糖的进展。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。