查询词典 carbon

In the single crystal of C60 with a FCC structure,positron mainly appears outside the C60 molecule.The main annihilation space is the interspace between molecules.The calculated positron bulk lifetime in C60 is 352ps, which agrees with experiment value of 356ps in literature.In carbon nanotube bundles with different dimeters,as the diameter of carbon nanotubes increases,the main space where positron appears changes from the interspace of carbon tubes to the space inside carbon tubes,the radio between positron annihilation with valence eletrons and core eletrons becomes larger,the positron bulk lifetime in carbon nanotube increase rapidly first and come to be a constant at the end.The calculated positron lifetime of carbon nanotube with a dimeter of 0.8～1.6ns is 332～470ps,which agrees with the experiment value of 394ps.Positron annihilation has been studied in widly used compound semiconductors.

计算结果表明：在片层结构的石墨晶体中，正电子主要在石墨层间的空隙中湮没，计算出的石墨中的正电子寿命为208 pS，与文献中的实验结果215 ps符合很好；在金刚石单晶中，正电子主要在碳原子之间的空隙中存在并发生湮没，计算出的金刚石中的正电子寿命为115 ps，文献中的实验结果110 ps左右符合；在面心立方结构的C60晶体中，正电子主要在C60分子球壳内外侧及分子之间存在，C60球形分子中心正电子分布很少，正电子的湮没区域集中在C60分子之间的空隙区域，计算出的C60中的正电子寿命为352 ps与文献中的实验结果356ps相符合；对于不同管径碳米管束中的正电子分布，随着碳纳米管直径的增加，碳纳米管束中的正电子由主要在碳纳米管管间的区域出现转变为主要在碳纳米管管内中心的区域出现：碳纳米管束中的正电子与碳原子的价电子的湮没概率变得越来越大，与核心电子的湮没概率变得越来越小；碳纳米管束中正电子的湮没寿命先迅速增大，而后趋于一定值。

ABSTRACT Global carbon cycle is a very important issue in the study of global climate change. Forest ecosystem carbon cycle is one of the important part of global carbon cycle, but at the present time there are considerable uncertainties in the research of global carbon cycle, which also exist in forest ecosystems carbon cycle research, especially in the estimation of carbon storage of region forest ecosystems and CO〓 fluxes exchanging with other systems.

全球碳循环是全球气候变化研究的核心问题之一，森林生态系统碳循环是全球碳循环的重要组成部分，目前在全球碳循环的研究中还存在很大的不确定性，这种不确定性同样存在于森林生态系统碳循环的研究中，尤其表现在对区域森林生态系统碳库大小及其与大气CO〓交换通量的估计上。

Division I provide a full range of composite materials products, including: Carbon Fabrics (1K, 3K, 6K, 12K-Plain, Twill Fabrics), Hybrid-Carbon Fibrics, Carbon AND Kevlar Hybrics、Carbon Fiber Pre-preg, Fibreboard and Carbon Sheet, PU leather Carbon Fiber (bags, purses, gloves, Shoes only), Plated Colorized Glass Fabrics (1 K, 3K-Plain, Twilled),Glass Fibreboard, PU leather glass fiber , Imitation Black and White Plain Fiberglass (1 K, 3K, 6K), Kevlar Fibrics, Nomex Honeycomb.

我司提供全面的复合材料产品，包括：碳纤维布（1K、3K、6K、12K平、斜纹、3K斜纹单面定型布专业使用于汽车大包围）、碳纤维混编织玻纤布、碳纤维混编织凯芙拉布、碳纤维预浸布、碳纤维板及片材、PU碳纤维皮革（箱包、钱包、手套、鞋专用）、彩色电镀玻璃纤维布（1K、3K平、斜纹）、电镀玻璃纤维板，PU玻璃纤维皮革、仿黑白编织玻纤编织布（1K、3K、6K）、凯芙拉编织布、Nomex纸蜂窝。

The following Composites have been materials products, including: Carbon Fabrics (1K, 3K, 6K, 12K-Plain, Twill Fabrics), Hybrid-Carbon Fibrics, Carbon AND Kevlar Hybrics、Carbon Fiber Pre-preg, Fibreboard and Carbon Sheet, TPU leather Carbon Fibrics (bags, purses, gloves, Shoes only), Plated Colorized Glass Fabrics (1 K, 3K-Plain, Twilled),Glass Fibreboard, TPU leather glass fibrics , Imitation Black and White Plain Fiberglass (1 K, 3K, 6K), Kevlar Fibrics, Nomex Honeycomb.

我司提供全面的复合材料产品，包括：碳纤维布（1K、3K、6K、12K平、斜纹、3K斜纹单面定型布专业使用于汽车大包围）、碳纤维混编织玻纤布、碳纤维混编织凯芙拉布、碳纤维预浸布、碳纤维板及片材、TPU碳纤维皮革（箱包、钱包、手套、鞋专用）、彩色电镀玻璃纤维布（1K、3K平、斜纹）、电镀玻璃纤维板，TPU玻璃纤维皮革、仿黑白编织玻纤编织布（1K、3K、6K）、凯芙拉编织布、Nomex纸蜂窝。

The method comprises following steps: reacting hydroxylation carbon nano-tube successively with reagent containing halogen and hydrosulphide to prepare sulfhydryl carbon nano-tube; reflowing the sulfhydryl carbon nano-tube and platinum salts in polyatomic alcohol, processing in hydrogen atmpsphere to obtain sulfhydryl anchoring platinum / carbon nano-tube catalyst; reflowing the sulfhydryl carbon nano-tube successively with the hydrochloroauric acid and the platinum salts in polyatomic alcohol, processing in hydrogen atmpsphere to obtain sulfhydryl anchoring platinum-gold / carbon nano-tube catalyst.

本发明将市售羟基化碳纳米管先后与含卤试剂和氢硫化物反应得到巯基化碳纳米管。再将巯基化碳纳米管与铂盐在多元醇中回流，氢气氛中处理得到巯基锚固铂/碳纳米管催化剂。将巯基化碳纳米管依次与氯金酸和铂盐在多元醇中回流，氢气氛中处理得到巯基锚固铂-金/碳纳米管催化剂。

Halogenated aromatic compounds with great q〓(the most negative net atomic charges on an atom of the molecule), ENC (electron-nuclear attraction energy of the one-center term for the carbon atoms of the weakest carbon-halogen bond), qc (thenet atomic charges on the carbon atom of the weakest carbon-halogen bond) and E〓 tend to be reductively dehalogenated slow, while halogenated aromatic compounds with high values of △E (the difference of front-line orbital energy), EEC (electron-electron repulsion energy of the one-center term for the carbon atoms of the weakest carbon-halogen bond), Mw, q〓 and α tend to be reductively dehalogenated fast.

卤代芳烃化合物的整个分子的最负的原子净电荷，键序最小的碳卤键中碳原子的单中心项电子-核吸引能，该碳-卤键上碳原子的净电荷和E〓与该卤代芳烃化合物还原脱卤的速率常数负相关；而前线轨道间隙能，键序最小的碳卤键中碳原子的单中心项电子-电子推斥能，Mw，q〓和α与该卤代芳烃化合物还原脱卤的速率常数正相关。

After the reorganization of the company through the acquisition of Fushun carbon, Chengdu and Hefei light carbon carbon, and enhance the company's overall profitability, not only to avoid the large side, Liaoning and with the existence of competition and maintain its own integrity and independence of the assets, and strengthen the company's The main business, to achieve the domestic industry to effectively integrate carbon, to form China's largest carbon group, in order to create the world's carbon laid the foundation for strong prices.

后该公司通过碳抚顺，成都，合肥轻碳碳，收购，提高公司的整体盈利能力，不仅能够避免大一些，辽宁和竞争的存在并保持其完整性和独立性重组的资产，并加强该公司的主要业务，以实现国内产业的有效整合碳，形成中国最大的碳小组，以创建世界上碳奠定了强有力的价格基础。

Among the various conductive fillers, carbon fibers have been proved to be a good candidate for EMI shielding. However, the electrical resistivity of a carbon fiber is much higher than the metal filler, so it must to use a greater number of carbon fibers in order to achieve the same shielding effect. In recent years, the Electroless plating is the new techniques of surface treatment of carbon fibers used to improve the electrical conductivity of carbon fiber. The copper-coated and nickel-coated carbon fibers have been proved to be a good candidate for EMI shielding.

导电高分子填充材料多使用碳纤维、碳黑及金属粉末，其中碳纤维具有高导电性、低密度及复合材料之补强特性，故本研究碳纤维作为填充材料，将碳纤维经过无电电镀处理，使其表面分别披覆金属镍及铜，增加碳纤维之导电度，混掺於聚丙烯高分子基材中，制成具有电磁波屏蔽功能之高分子复合材料，研究不同高分子成型方式与金属镀层对於碳纤维电学性质及复合材料电磁波屏蔽效益之影响。

The study indicates that the content of soil carbon is on the low side because human behavior has a negative effect on sloping cropland. However, the content of every group soil carbon increased drastically by planting Robinia . With the increasing of the time of conservation, the relationship is very remarkable. After 50 years of restoration, the content of TOC, LOC, NLOC and AI in the study plot increased by 271%,174%, 467%, and 271%, respectively, compared with sloping cropland. The increasing speed of NLOC was faster than LOC. It is assumed that the increased carbon by restoration is stored in an inactive form to produce active matter which is necessary for biont. And the soil carbon must keep active to fulfill the balance of carbon dynamic transformation. At initial stages, soil carbon management index increased remarkably.

营造刺槐林可以显著增加土壤碳库各组分含量，并随恢复年限呈显著线性关系，50a时TOC、LOC、NLOC和碳库指数分别较坡耕地增加271%、174%、467%和271%，其中NLOC增加速率略高于LOC，表明植被恢复增加的土壤碳素绝大多数以非活性形态贮存起来，而为了满足生物生长所必须的活性物质来源，土壤碳库必须维持一定的活度状态来满足碳素的动态转化平衡，碳库管理指数在营造刺槐林初期显著降低，随后先增加后降低，与刺槐林生长特性密切相关；但与天然林相比差距仍然较大，恢复50a时TOC、LOC和NLOC仅为侧柏林的49%、34%和61%。

The results available now indicate that glass-like carbon synthesized from phenolic resin is a non-graphitizing carbon, and consists of both sp 2-hybridized carbon atoms that form imperfect graphite structure and sp 3-hybridized carbon atoms that are due to the presence of disordered carbon; and in the fullerene-related structure of glass-like carbon, there exist some pentagons and heptagons carbon rings.

玻璃炭作为一种特殊炭材料已广泛应用于许多领域，其制备、性质、应用以及基本结构的研究已经取得了很大的进展，已有的研究结果表明酚醛树脂基玻璃炭是一种典型的非石墨化炭材料，由 sp2杂化态碳原子和 sp3杂态碳原子组成，且在其类富勒烯结构中存在五元环和七元环。

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。