共查询到20条相似文献,搜索用时 0 毫秒
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《Photonics Technology Letters, IEEE》2009,21(3):164-166
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《Microwave Theory and Techniques》1982,30(5):694-700
The deviations from the group delays expected for the optimum power-law index profile are numerically calculated for several types of undesired fibers using a scalar multilayer approximation method. This paper shows the way two fibers are selected from among undesired fibers so that the fiber spliced to each other becomes broad band. 相似文献
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接续盒异端接续冗余光纤的收容方法 总被引:2,自引:0,他引:2
介绍了使用接续盒对光缆异端进出接续时冗余光纤的收容方法,该收容方法克服了传统冗余光纤收容及拆纤维护不方便的缺点,为冗余光纤收容方法的规范化提供了技术基础。 相似文献
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Functional Polysaccharide Sutures Prepared by Wet Fusion of Interfacial Polyelectrolyte Complexation Fibers 下载免费PDF全文
Minjae Do Byung Gee Im Joseph P. Park Jae‐Hyung Jang Haeshin Lee 《Advanced functional materials》2017,27(42)
This study reports polysaccharide‐based fibers that can be utilized as biocompatible functional sutures. Fibers are spontaneously formed by spinning at the interface between two oppositely charged polysaccharide solutions. Unlike the common belief that polysaccharide fibers prepared by electrostatic interactions would exhibit weak mechanical strength, it is demonstrated that fibers spun at the interface between two droplets of positively charged chitosan and negatively charged heparin can exhibit high mechanical strength through spontaneous wet‐state fusion of interfiber strands at a spinning wheel. Dry solidification results in multistranded fibers that were ≈100 µm in diameter with a tensile strength of ≈220 MPa. Post fibrous manipulation yields various morphology with straight or twisted fibers, fabrics, or springs. To demonstrate application of the fiber, it is applied as a medical suture. As heparin has a unique ability to bind adeno‐associated virus (AAV), a therapeutic, biocompatible suture exhibiting localized AAV‐mediated gene delivery function can be prepared. This study shows that multistrand fusion of fibers, formed by weak, electrostatic interactions and followed by drying solidification counterintuitively results in mechanically strong, functional fibers with various potential applications. 相似文献
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程平辉 《电信工程技术与标准化》2006,19(2):52-54
对于光纤熔接损耗,目前多认为其取决于被熔光纤特性、熔接操作技艺以及熔接机的熔接性能,而忽视了加热器对熔接损耗的影响;因此,本文基于光缆工程建设中所发现的障碍现象,来剖析加热器附加于光纤熔接损耗的形成机理,并提出解决措施. 相似文献
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《Optical Fiber Technology》2000,6(2):181-191
Using the finite element method, we propose an accurate vector analysis of the lowest electromagnetic modes of photonic crystal fibers. The likeness of their propagation characteristics to those of step index fibers is emphasized. Within the determined limits of a domain of validity, an equivalent step index fiber is defined. In addition, the single-mode broadband behavior of photonic crystal fibers is analyzed. The chromatic dispersion at any wavelength is reliably predicted from the geometric parameters of these fibers. With suitable geometrical parameters, the zero dispersion wavelength can be shifted, for example, toward values close to 1 μm. 相似文献
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本文给出精确计算复折射率光纤复传播常数的简单微扰分析方法。光纤的复模折射率N=N′+iN″的实部N′由求解相应的实本征值方程得到,而虚部N″则由微扰计算得到。导出了计算阶跃型圆光纤基模衰减系数或增益系数的简单解析公式。本法计算结果与由解复本征值方程得到的精确数值结果符合很好。 相似文献
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湿化学法合成先驱体制备氮化硼纤维的研究 总被引:3,自引:0,他引:3
以硼酸和三聚氰胺为原料,采用湿化学法合成先驱体,在氮气气氛中制备出氮化硼(BN)纤维。用中和滴定法、红外吸收光谱(IR)、X射线衍射(XRD)、扫描电镜(SEM)对合成的先驱体及制得的BN纤维的氮含量、形貌及结构进行分析。结果表明合成温度1,700℃,保温时间3 h,氮气流量2 L/min时制得的BN纤维的氮含量为53.46%,达到理论值的95%。先驱体分子中存在B—N、N—H、C—O—C、—(B—N)—结构单元。用扫描电镜观察制得的BN纤维直径为2~10 靘,长径比为40~50。 相似文献