化纤仿真精品织物染整加工

化纤仿真精品织物的染整加工是一系统工程,除纤维选择,织物设计外,还要制定染整工艺路线,工艺条件,选择染化料及其相关设备。文章主要介绍了化纤仿麻纱,仿毛的染整工艺。     

SC系列涂饰剂的性能特点及应用

对聚氨酯涂饰剂系列产品的性能特点及应用进行了阐述。 Ｓ Ｃ９３００ 系列柔软性突出,遮盖力强; Ｓ Ｃ９６０ 系列丰满弹性显著,遮盖力好,耐溶剂; Ｓ Ｃ８００ 系列涂层薄,真皮感强,弹性好,耐溶剂,耐水性好。合理搭配使用,能满足不同革品种的涂饰要求。提供１０ 个分别用于大面积补伤、服装革、沙发革、鞋面革涂饰的配方及工艺供参考。     

基于Kolmogoroff方法重构光纤光栅相位响应

借用信号处理的kolmogoroff方法,在最小相移的前提下,由光纤光栅的强度响应谱重构相位响应及冲激脉冲响应,由此确定时延、色散以及光纤光栅的某些结构特征。以均匀光纤光栅为例,证明该方法是行之有效的。     

任意单模光纤的微弯损耗与模场半宽之间的关系

本文导出了任意单模光纤的微弯损耗与近场二阶矩模场半宽W_(x1)、W_(y1)的关系式,在圆对称情况下我们的公式将简化为已有结果。     

光纤级联系统中准孤子传输的数值模拟

本文基于一种光纤级联系统模型,用数值模拟方法考察准孤子在这种中的传输情况,得到了传输１００００ｋｍ的最佳方案并给出了当输入光脉冲的峰值功率、初始宽及啁啾变化时,系统的传输特性     

侧面泵浦Nd：YAG连续激光器

介绍了一种二极管侧面泵浦的Nd:YAG连续激光器，采用了简单、实用的侧面泵浦结构，获得了37.9W的连续1.064nm的激光输出，斜效率为31.5%，光效率为23．7％。     

The use of a figure-of-eight coil for fibre optic respiratory plethysmography: Geometrical analysis and experimental characterisation

An optical fibre sensor based on the macro-bending loss effect has been redeveloped for thoracic and abdominal circumference measurements in non-invasive plethysmographic respiratory monitoring. A new geometrical analysis of the figure-of-eight transducer is presented, along with an optical analysis, and experimental results are presented which are in good agreement with these analyses. A comparison is made with earlier implementations of macrobending loss effect based transducers for respiratory measurement, and the newer sensor compares favourably, indicating a higher resolution and a simpler mechanical construction.     

Nano-Engineered Carbon Fibre-Based Piezoelectric Smart Composites for Energy Harvesting and Self-Powered Sensing

The integration of piezoelectric materials onto carbon fiber (CF) can add energy harvesting and self-power sensing capabilities enabling great potential for “Internet of Things” (IoT) applications in motion tracking, environmental sensing, and personal portable electronics. Herein, a CF-based smart composite is developed by integrating piezoelectric poly(3,4-ethylenedioxythiophene) (PEDOT)/CuSCN-coated ZnO nanorods onto the CF surfaces with no detrimental effect on the mechanical properties of the composite, forming composites using two different polymer matrices: highly flexible polydimethylsiloxane (PDMS) and more rigid epoxy. The PDMS-coated piezoelectric smart composite can serve as an energy harvester and a self-powered sensor for detecting variations in impact acceleration with increasing output voltage from 1.4 to 7.6 V under impact acceleration from 0.1 to 0.4 m s⁻². Using epoxy as the matrix for a CF-reinforced plastic (CFRP) device with sensing and detection functions produces a voltage varying from 0.27 to 3.53 V when impacted at acceleration from 0.1 to 0.4 m s⁻², with a lower output compared to the PDMS-coated device attributed to the greater stiffness of the matrix. Finally, spatially sensitive detection is demonstrated by positioning two piezoelectric structures at different locations, which can identify the location as well as the level of the impacting force from the fabricated device.     

Photonic bandgap fibre oscillators and amplifiers

In the search for ever higher output power or energy from fibre oscillators or amplifiers a nowadays mature technology relies on enlarging the fibre mode area. Broadening of the core diameter, all other things being equal, inevitably yields a multimode fibre, thereby dramatically limiting the device usefulness. Various strategies have been deployed to design and manufacture single transverse mode fibre oscillators and amplifiers, among which making use of the so-called photonic bandgap effect to restrict the modal population seems promising. Helped by efficient and reliable numerical tools the design of large mode area singlemode photonic bandgap fibres is presented. Two fibres with 20-μm and 40-μm core diameter, both of them heavily doped with Yb³⁺ ions, have been fabricated by the widespread modified chemical vapour deposition process and are shown to behave properly when used as the core element of either continuous wave oscillators or femtosecond amplifiers. Good output beam quality (M² parameter spanning from 1.12 to 1.5 for the set of fibres studied) and high slope efficiency of 80% in cw oscillation regime are demonstrated. Furthermore the 40-μm core diameter fibre is shown to be resilient to tight bending down to 7.5-cm radius. The stack-and-draw process makes it easy to tailor the outer cladding so that a large numerical aperture can be reached. Subsequently, from this air-clad fibre, 500 fs 47 W pulses at 35 MHz are obtained from a two-stage chirped pulse amplification system.