温度对光缆中数字信号漂移特性的影响

在光缆传输系统中，环境温度的变化会使数学信号发生漂移，从而影响传输质量。在长途架空光缆传输系统中，这种影响最为严重。首先对影响光纤中数字信号漂移的因素进行分析，然后给出试验光纤的温度漂移特性的测试结果，并对试验数据进行了处理和分析。最后，对光缆中数字信号的温度漂移特性进行了讨论。     

电缆、光缆及材料土壤腐蚀研究

总结了“八五”期间挖掘的全国土壤腐蚀网29个试验站18种电缆、光缆及材料1～5年及35年土壤腐蚀试验结果，比较了外护套材料的耐腐蚀性能，分析了金属护套土壤腐蚀的主要因素。讨论研究了电缆、光缆的不同护层结构的土壤腐蚀特性及其对电缆、光缆的保护作用。     

电缆,光缆及材料土壤腐蚀研究

总结了“八五”期间挖掘的全国土壤腐蚀网２９个试验站１８种电缆，光缆及材料１～５年及３５年土壤腐蚀试验结果，比较了外护套材料的耐腐蚀性能，分析了金属护套土壤腐蚀的主要因素，讨论研究了电缆，光缆的不同护层结构的土壤腐蚀特性及其对电缆，光缆的保护作用。     

无公害阻燃光缆的制备工艺及特性

本文详细介绍了无公害阻燃光缆的结构设计和制造工艺，并对光缆的性能，特别是燃烧特性进行了研究。结果表明该光缆除了保留普通光缆的传输特性外，在燃烧过程更具有发烟量少、无毒性、不传播火焰且能保持通信畅通等特点，是局域网和专用网等特殊场所防火用的新型无公害阻燃光缆。     

高强度引入光缆的开发

本文不仅评定了日本古河电工开发的引入光缆，还评定了对PBO—FRP加强件进行的所有试验，包括环境试验和机械试验。评定的结果是，PBO-FRP加强件在长期老化之前和之后均保持高的抗拉强度，采用PBO—FRP的引入光缆的抗拉强度比采用芳纶．FRP的光缆高2．5倍，且几乎与采用单根钢丝的光缆的抗拉强度一样。此外还对PBO—FRP引入光缆进行了其它试验，包括弯曲硬度、光学、机械、环境试验和可燃性，也得出良好的结果。 日本古河电工的研究结果是开发出一种引入光缆，它结合了等于或优于采用金属加强件的传统引入光缆的高抗拉强度以及像非金属引入光缆一样好的加工性能这两个优点。     

2000芯光缆的结构和性能

本文介绍高密度大芯数光缆。该缆中的光纤带置于骨架槽内，总芯数超过目前最大芯数（１０００芯）。光缆结构和光缆直径是关系到费效比的两个重要因素，我们从理论和实验上加以研究，获得了缆径较小的最佳结构。根据研究结果，我们制作了２０００芯光缆，并评估了其性能。该缆的传输特性、机械特性和中间接入特性都被证明达到优良水平。     

光缆接头盒机械性能试验若干问题的探讨

光缆接头盒是光纤通信线路中不可缺少的部件，它对光纤光缆的连接保护、光缆线路通信质量起重要的作用。为此，探讨了光缆接头盒机械性能试验的若干技术问题，如试样制备、试验条件和程序、设备和试样状态控制，以及与试验判据有关的几个问题。     

京汉广干线光缆工程黄河桥大长度光缆线路的建设

叙述了京汉广干线光缆线路工程过黄河建设方案的选定、工程设计、光缆生产及施工放缆等过程。并详细介绍了光缆敷设一年后，光传输特性和机械特性的检查测试情况。     

室内光缆机械性能试验条件和验收方法探讨

通过对室内使用光缆行业标准及企业标准中有关机械性能规定的分析，提出了室内光缆机械性能试验条件的修改建议。此外，还提供了4种室内光缆的6项机械性能试验结果，并通过试验结果进一步证实了对室内光缆机械性能试验条件修改建议的必要性和合理性。     

浅析光缆护套在接头盒处回缩的原因及解决方法

本文阐述了光缆护套回缩的原因，并对光缆接头盒与光缆护套的固定进行了一些试验，从光缆生产、接头盒的设计以及施工等方面探讨解决光缆护套回缩的方法。     

Ag和RE对SnAgCuRE无铅钎料拉伸性能的影响

利用正交试验法,对SnAgCuRE系钎料合金的拉伸性能进行了检验。结果表明:SnAgCuRE系钎料合金的拉伸性能与Ag和RE的添加量密切相关,即拉伸强度会随Ag含量增大而提高;延伸率受RE影响最大,并在w(RE)为0.1%时延伸率和拉伸强度都达到最佳。当w(RE)达到0.5%时,会导致延伸率的下降。     

Theoretical modeling and experimental high-speed imaging of elongated vocal folds

In this paper, the role of vocal fold elongation in governing glottal movement dynamics was theoretically and experimentally investigated. A theoretical model was first proposed to incorporate vocal fold elongation into the two-mass model. This model predicted the direct and nondirect components of the glottal time series as a function of vocal fold elongation. Furthermore, high-speed digital imaging was applied in excised larynx experiments to visualize vocal fold vibrations with variable vocal fold elongation from -10% to 50% and subglottal pressures of 18- and 24-cm H(2)O. Comparison between theoretical model simulations and experimental observations showed good agreement. A relative maximum was seen in the nondirect component of glottal area, suggesting that an optimal elongation could maximize the vocal fold vibratory power. However, sufficiently large vocal fold elongations caused the nondirect component to approach zero and the direct component to approach a constant. These results showed that vocal fold elongation plays an important role in governing the dynamics of glottal area movement and validated the applicability of the proposed theoretical model and high-speed imaging to investigate laryngeal activity.     

Submarine optical-fibre cable design considering low elongation under tension

Submarine optical-fibre cable design considering low elongation under tension is proposed. Submarine cable using aluminium pressure resistant pipe according to this design can decrease the cable elongation under laying and recovery, and can be used even in deep sea up to a depth of 5000 m.     

平整机延伸率控制

本文以莱钢冷轧薄板生产线四辊式平整机为例,分析其延伸率控制原理,介绍延伸率控制系统的组成及控制模式,介绍延伸率控制系统中的重要算法.     

Microstructure and mechanical properties of annealed Al-1%Si bonding wire

The microstructure and mechanical properties of 1.25-mil diameter Al-1%Si bonding wire annealed at various temperatures and times have been investigated. The results indicate that the strength shows normal decrease with increasing time and temperature, but the elongation exhibits an unusual U-shaped variation. Of interest is a special point in annealing at a given temperature, that is, same strength (σ_s = σ_b = 150–160 MPa), same elongation (δ<0.2%), and same fracture surface. Annealed at a lower temperature (>300°C), the recrystallized structure has a fine annealing texture that possesses less elongation. At intermediate temperature (300–480°C), some grains grow to intersecting grains and form a mixed structure in which the elongation is about 3–6%. At temperature greater than 480°C, the grains grow rapidly to ultra-long grains. Single slip occurs easily in these ultra-long grains, resulting in lower strength and greater elongation (10–16%). For wire testing, the geometric factors of the wire play a very important role, affecting the microstructure and mechanical properties.     

基于应变速率的激光喷丸强化6061-T6铝合金力学性能分析

为研究不同应变速率下激光喷丸对6061-T6铝合金力学性能的影响,对标准拉伸试样进行单面和双面激光喷丸强化处理,随后在0.0001～0.1s-1 4种连续应变速率加载条件下,对未喷丸、单面喷丸、双面喷丸3组试样进行了力学性能测试,同时测试了试样表面残余应力,分析了喷丸前后材料表面粗糙度变化及其对延伸率的影响,探讨了激光喷丸后力学性能变化的微观机理。结果表明,抗拉强度(UTS)及屈服强度随应变速率的增加而增大,延伸率随应变速率的增加略微减小;与未处理试样相比,单面激光喷丸后,铝合金的抗拉强度及屈服强度得到小幅提高,延伸率大约降低了1%;双面激光喷丸后,铝合金抗拉强度最大提高了10.8%,屈服强度最大提高了12.5%,延伸率降低了2%左右。激光喷丸区域晶粒得到细化,位错密度得以增加,6061-T6铝合金的力学性能得到改善。     

Characteristics of wire-space-type submarine optical cable

A new type of submarine optical cable, called wire space cable, is proposed for utilisation in shallow sea areas. In the cable, optical fibres are inserted into spaces formed between stranded wires, which are used as tension members. It has been found from a cable pulling test that nonarmoured cable elongation at 8000 m in water depth is 0.3% and armoured cable elongation at 6000 m is 0.5%. Furthermore, a hydraulic pressure test has shown that single-mode-fibre loss at 1.3 ?m wavelength does not increase up to a water depth of 2700 m.     

超辐射发光二极管的散斑自相关法表面粗糙度测量研究

利用相干或部分相干光被粗糙表面散射产生的散斑现象进行表面粗糙度测量是一类有应用前景的在线测量技术。研究了窄带连续谱光束被随机粗糙表面散射形成的远场散射光场的散斑延长效应和将其应用于表面粗糙度测量的可行性。理论和模拟研究表明:随着观测点逐渐远离散射光场中心,散斑延长率越来越大;在相同的观测位置,表面的粗糙度越小,散斑延长率越大。构建以超辐射发光二极管（Superluminescent Diode,SLD）为光源的实验系统,以散斑延长率衍生的光学粗糙度指标来衡量表面粗糙度,对电火花加工的表面粗糙度对比样块进行粗糙度测量实验,结果表明光学粗糙度指标随着被测表面粗糙度的增加而单调递减。比起一组分立波长的光源,采用窄带连续谱光源的表面粗糙度测量系统有更大的测量范围。     

平面微弹簧的模拟、加工制备和力学性能表征研究

微弹簧是一种重要的MEMS器件 ,可为微传感器和微执行器提供弹性力。我们设计并用UV LIGA技术制备了数种不同形状的平面微弹簧 ,并用ANSYS对其力学性能如刚度、断裂强度等进行了模拟。由于制备出的平面微弹簧体积很小 ,无法用常规的测试仪器进行测试 ,我们为此设计并制备了一台平面微弹簧力学性能测试仪 ,其位移分辨率为 1μm ,力分辨率为 1mN。模拟得出的结果与测量结果一致性较好 ,与闭环平面微弹簧相比 ,S型平面微弹簧具有较大的位移和较小的刚度 ,弹簧的刚度随着弹簧厚度的增加而增加。铜微弹簧的屈服强度和屈服位移仅为镍平面微弹簧的 5 % 7%。     

Self‐Assembled Shape‐Memory Fibers of Triblock Liquid‐Crystal Polymers

New thermoplastic liquid‐crystalline elastomers have been synthesized using the telechelic principle of microphase separation in triblock copolymers. The large central block is made of a main‐chain nematic polymer renowned for its large spontaneous elongation along the nematic director. The effective crosslinking is established by small terminal blocks formed of terphenyl moieties, which phase separate into semicrystalline micelles acting as multifunctional junction points of the network. The resulting transient network retains the director alignment and shows a significant shape‐memory effect, characteristic and exceeding that of covalently bonded nematic elastomers. Its plasticity at temperatures above the nematic–isotropic transition allows drawing thin well‐aligned fibers from the melt. The fibers have been characterized and their thermal actuator behavior—reversible contraction of heating and elongation on cooling—has been investigated.