查询词典 fiber graphite

With this method the copper plating graphite powder was made up in 50% copper content .The silver- copper plating graphite composite was prepared while the silver- copper-graphite composite and the silver-graphite composite were also made up together .The mechanical and electric characteristics of the three kinds of composites were tested and it was found that the copper plating graphite powder can only optimize the properties of the silver matrix composite under the high content of the graphite ,the conductivity and the mechanical property was improved and the material could take higher current in the same carbon content .At 20% carbon content, the resistivity of Ag-graphite composite was 1.67 times as high as that of silver- copper plating graphite composite, the resistivity of Ag-Cu-graphite composite was 3.23 times as high as that of silver- copper plating graphite composite. The bending strength of silver-copper plating graphite composite was 2.17 times as high as that of silver- copper-graphite composite, and the bending strength was 2.11 times as high as that of silver- copper-graphite composite. The wearability of silver- copper plating graphite composite was also enhanced greatly at high carbon content.

利用该方法制备了50%铜含量的镀铜石墨粉，然后进一步制备了一系列相同碳含量的银-石墨复合材料、银-铜-石墨复合材料、银-镀铜石墨复合材料，对三种材料的机械、电气性能进行了综合对比，发现在低碳含量时镀铜石墨粉不能改善复合材料的上述主要性能，而在中高碳含量时则能明显优化复合材料的整体性能，提高了复合材料的电导率，使复合材料在中高碳含量时既具有较高的耐磨性同时也能负载较大的电流，复合材料的机械性能也因镀铜石墨粉的加入而大幅提高，20%碳含量时，银-石墨复合材料的电阻率是银-镀铜石墨复合材料的1.67倍，银-铜-石墨复合材料的电阻率为银-镀铜石墨复合材料的3.23倍，银-镀铜石墨复合材料抗弯强度是银-铜-石墨复合材料的2.17倍，是银-石墨复合材料的2.11倍，同时，在实验给定的条件下，中高碳含量时银-镀铜石墨复合材料的机械磨损耐磨性和通电磨损耐磨性都得以显著提高，银-镀铜石墨复合材料在实验时的接触电压降也更为稳定。

To provide optical fiber: Fiber Distributed Temperature Stress Test System, Fiber Distributed Temperature Measurement System, Fiber Bragg Grating Health Monitoring System, fiber optic geophone systems, fiber Bragg grating wavelength calibration instrument and so on, which sensor product line is extremely rich and has industry representation, including: fiber optic temperature hygrometer, fiber-optic gas alarm, fiber-optic magnetic field sensors, optical fiber vibration sensor, fiber-optic high temperature pressure sensors, fiber-optic WIM system , fiber optic strain gauge welding, fiber optic embedded strain gauge, optical soil pressure gauge, fiber reinforcement meter, fiber optic pressure ring, fiber-optic displacement meter, fiber cracks meter, fiber optic osmometer, fiber-optic temperature sensor high temperature , optical fiber cable meter and so on.

北京达卡科技有限公司光纤方面提供：光纤分布式应力温度测试系统、光纤分布式温度测试系统、光纤光栅健康监测系统、光纤地震检波系统、光纤光栅波长校验仪等，其中传感器产品线极为丰富和具有行业代表性，包括：光纤温湿度计、光纤瓦斯报警器、光纤磁场传感器、光纤振动传感器、光纤耐高温高压传感器、光纤动态称重系统、光纤焊接式应变计、光纤埋入式应变计、光纤土压力计、光纤钢筋计、光纤压力环、光纤位移计、光纤裂缝计、光纤渗压计、光纤耐高温温度传感器、光纤钢索计等。

Our company can provide various analytical aas graphite furnace, various graphite cone, graphite tube, graphite platform, graphite crucible for gas analysis, graphite gleithretter, graphite sinter pole, heterotype graphite mould, graphite crystallizer, oil free bearing, thermocouple graphite protecting jacket, graphite obturating ring.

我公司可以向国内外用户提供各种分析仪器原子吸收石墨炉，各种型号石墨锥、石墨管、石墨平台；各型号气体分析仪器石墨坩埚、各尺寸石墨滑片、石墨烧结棒、异型石墨模具、石墨结晶器、无油石墨轴承、各型号热电耦石墨保护套、石墨密封圈。也可以来图带料加工。

Our company can provide various analytical AAS graphite furnace, various graphite cone, graphite tube, graphite platform, graphite crucible for gas analysis, graphite gleithretter, graphite sinter pole, heterotype graphite mould, graphite crystallizer, oil free bearing, thermocouple graphite protecting jacket, graphite obturating ring.

我公司可以向国内外用户提供各种分析仪器原子吸收石墨炉，各种型号石墨锥、石墨管、石墨平台；各型号气体分析仪器石墨坩埚、各尺寸石墨滑片、石墨烧结棒、异型石墨模具、石墨结晶器、无油石墨轴承、各型号热电耦石墨保护套、石墨密封圈。

Products: graphite ring, graphite seal ring, graphite seals, graphite bearings, graphite crucible, graphite spherical ring, cylindrical graphite, graphite blades, flexible graphite, graphite ring rotary joint, sliding, bearing, friction block, piston rings, orientation ring, such as carbon plate.

产品：石墨密封圈，石墨密封环，石墨密封件，石墨轴承，石墨坩埚，石墨球面环，石墨圆柱，石墨叶片，柔性石墨，旋转接头石墨环，滑片，轴瓦，磨擦块，活塞环，导向环，碳板等。

The device comprises an arc discharge vacuum chamber; wherein, the arc discharge vacuum chamber is connected with a vacuum pump and is internally provided with a graphite cathode and a graphite anode which are connected with a DC supply. The device is characterized in that the graphite cathode and the graphite anode are respectively provided with an upper spherical crown shape graphite plate and a lower spherical crown shape graphite plate which are matched with each other and formed a spherical crown shape capacitor.

它包括电弧放电真空室，电弧放电真空室与真空泵相连接，电弧放电真空室内设有石墨阴极和石墨阳极，石墨阴极和石墨阳极与直流电源相连接，其特征在于在石墨阴极和石墨阳极上分别设相配合的上球冠形石墨板和下球冠形石墨板，上球冠形石墨板和下球冠形石墨板形成球冠型电容器。

The results show that the compound conductive fiber has typical structure of sheath-core consists of black greened polyaniline electric conductive deposition as the skin and the white polypropylene matrix fiber as the core, which makes the compound fiber preferable physical mechanical property. The intensity and the elongation ratio of the electric conductive fiber are decreased but the thermal stability is enhanced after modified. The compound fiber has the good acid resistance but poor base resistance. The thermal stability of the compound fiber prepared by 4-methyl-benzene sulfonic acid is better than that prepared by hydrochloride acid. Moreover, the compound fiber can be re-doped by other organic or inorganic acid after freed from the adsorbed acid. Furthermore, the electric conductivity of the compound fiber decreases with the temperature increasing but hardly changed with the humidity. The adsorptive ability and therefore the content of the polyaniline, the constant of electric conduction, and the durability of the compound fiber can be enhanced by thinning the diameter, section heteromorphosis, section heteromorphosis and plasma treatment of the surface or blending with COPET of the fiber.

结果表明：复合纤维是聚丙烯与聚苯胺的共混体系，具有典型的皮芯型结构，皮层为墨绿色的聚苯胺沉积层，形成连续的导电通道，芯层为白色的聚丙烯基质纤维，提供物理机械性能；导电改性后纤维的强度、强力和伸长率均有下降，但热稳定性得到提高；复合纤维的耐酸性比耐碱性好，以对甲苯磺酸做掺杂酸比盐酸掺杂聚苯胺热稳定性好，脱掺杂后的复合纤维，可用其它无机酸或有机酸进行再掺杂；复合导电纤维的电导率随温度升高降低幅度较大，但几乎不受湿度影响；基质纤维细旦化、截面异形化、表面等离子体处理或共混COPET等改性处理均能提高纤维的吸附性，进而提高复合纤维表面聚苯胺含量、电导率和耐久性。

Our company established in 2003, is Sichuan Panxi area networks, security systems integrators, including the network system security system set and two operations, the main business network system has a full range of optical products: fiber optic transceivers, fiber optic splitter, fiber jumper, fiber optic MODEM, fiber-optic switches, fiber-optic conversion head, optical fiber and cable, fiber optic single-mode to multimode, fiber couplers, optical terminal boxes, etc.; integrated wiring a full range of products: patch panel, modules, panels, cable, crystal head, of the rationale for line planes, jacket, etc.; switch various modules: MINI GBIC, GBIC, Gigabit Fast fiber module; Fluke Corporation is qualified network monitoring equipment distributors, large and medium-sized enterprises to be able to provide network surveillance testing, fault location, network performance evaluation, as well as third-party network maintenance.

本公司2003年成立，是四川攀西地区网络、安防系统集成商，包括网络系统集和安防系统二大业务，网络系统主要业务有光纤全系列产品：光纤收发器，光纤分路器，光纤跳线，光纤MODEM，光纤交换机，光纤转换头，光纤光缆，光纤单模转多模，光纤耦合器，光端盒，等；综合布线全系列产品：配线架，模块，面板，网线，水晶头，理线架，护套，等；交换机各种模块：MINI GBIC ， GBIC ，千兆百兆光纤模块；公司是FLUKE 网络监控设备的合格经销商，能够为大中型企业提供网络监控测试，故障定位，网络性能评估，以及第三方的网络维护。

The fiber length has only little influence on the basic density within the growth rings, and significant correlation at 0.01 levels was found between the basic density and the fiber length among the different rings. Only slight negative correlation was found between the basic density and the fiber width within the growth rings, but significant positive correlation at 0.01 levels was indicated between the basic density and the fiber width among the growth rings, contrary to that of fiber length. It was demonstrated that significant positive correlations at 0.01 levels between the basic density and fiber double wall thickness, fiber length to width ratio and double wall thickness to diameter ratio, significant negative correlations at 0.01 levels between the basic density and fiber diameter and diameter to width ratio, only slight negative correlation between the basic density and fiber width both in the same growth rings and among the different growth rings. No significant correlation was found between the basic density and the vessel morphological features, nor was the tissue proportion in the same growth rings. But among the different rings, it was found there was significant positive correlation at 0.01 levels between the basic density and the fiber proportion among the different rings, and significant negative correlation at 0.01 levels between the basic density and vessel-elements proportion and ray proportion, only slight negative correlation between the basic density and the parenchym proportion. Significant or no significant negative correlation was found between the basic density and the microfibril angle in the same growth rings, but significant negative correlation was found between the basic density and the microfibril angle among the different growth rings.

生长轮内纤维长度对基本密度的影响不大，而在不同生长轮间纤维长度与基本密度达极显著正相关，纤维宽度与此相反，同一生长轮内纤维宽度与基本密度极显著负相关，不同生长轮间只有微弱负相关；基本密度与纤维双壁厚、长宽比、壁腔比在生长轮内和生长轮间均呈极显著正相关，而与胞腔直径、腔径比均呈极显著负相关，仅与纤维宽度呈微弱的负相关；导管形态对基本密度的影响不显著；同一生长轮内组织比量对基本密度的影响也不显著，但不同生长轮间基本密度与纤维比量呈极显著正相关，与导管比量和木射线比量呈极显著负相关，与轴向薄壁细胞比量仅呈不显著负相关；生长轮内基本密度与微纤丝角呈显著或不显著负相关，但在生长轮间这种负相关达到极显著水平。

A device and method for preparing compound nano fiber endless tow, which contains feeding material liquid to pair of electric spinning nozzle on frame, each nozzle respectively applied with high dc voltage with opposite polarity, each pair of nozzle jetting out nano fiber with opposite electric charge, said nano fiber attracting and colliding each other to form compound nano fiber, then forming nano fiber endless tow after drawing and stretching, the first opposite set pair of electric spinning nozzle jetted compound nano fiber endless tow is stretched down and used as acceptor which covered by the nano fiber jetted by second pair of nozzle an d forming two layers of compound nano fiber endless tow after drawing and stretching, in turn to get multilayer compound nano fiber endless tow after drawing and stretching by godet roller.

复合纳米纤维长丝束制备装置及其制备方法是一种简单、高效电纺制备纳米纤维长丝束的方法，其步骤为将料液输送给支架(3)上的电纺喷头对(1)；喷口相向的电纺喷头对(1)的每个喷头分别施加相反极性的直流高电压；每对相向喷口喷出分别带相反电荷的纳米纤维，并在空中相互吸引、碰撞形成复合纳米纤维，经牵引、拉伸后形成复合纳米纤维长丝束；第一对相向放置的电纺喷头纺丝形成的复合纳米纤维长丝束向下拉伸，并作为接受体与第二对电纺喷头喷出的分别带相反电荷并相互吸引的纳米纤维在空中相遇，被第二对电纺喷头喷出的纳米纤维包裹，经牵引、拉伸后形成两层复合纳米纤维长丝束；依次类推，最后经导丝辊对(2)牵引、拉伸后得到多层复合纳米纤维长丝束。

Decreasing the apex angle appropriately of the transmitter helps the signal detection when the scattering angle remains unchanged.

计算结果还表明，在散射角和传输距离一定的情况下，适当地降低发射机的仰角可以提高接收机探测到的信号功率和信噪比。

Come and find out how it is done in missions in today's pluralistic world.

请与我们一同探讨在多元化的世界里，如何做传福音的工作。