Medialization Laryngoplasty With Gore-Tex: An Animal Study

Vocal cord paralysis is a disease that can cause voice disability and aspiration problems. Expanded polytetrafluoroethylene (ePTFE; Gore-Tex) has been widely used in cardiovascular and plastic surgery; however, its biocompatibility and safety have not been established precisely in the larynx. In this study, the biocompatibility and safety of ePTFE used in vocal cord medialization in the rabbit larynx were assessed. Type 1 thyroplasty with Gore-Tex was performed on one side of the larynx in eight rabbits. A sham procedure was applied on the contralateral side of their larynx. The rabbits were sacrificed after 6 months, and macroscopic and microscopic evaluations and comparisons were performed. No significant inflammatory response to Gore-Tex or displacement of the implant was seen. There was only a tiny fibrotic capsule surrounding the material in each specimen. Intense eosinophilic cell infiltration was seen surrounding one rabbit specimen. Gore-Tex seems to be a biocompatible, stable, and reversible material that can be safely used in laryngeal framework surgery.     

Sampling-free analysis of chemical compounds using a static Fourier-transform spectrometer

We have considered a technique for noncontact analysis of compounds and a device for its realization. To construct the device, we have proposed a static Fourier-transform spectrometer that is based on the phenomenon of interference in a wedge. A procedure for obtaining and processing emission spectra has been described. Interference patterns are recorded using sources of excitation radiation of 280 and 315 nm. Basic characteristics of the optical system have been calculated, and emission spectra of test objects have been presented.     

一种光电混合集成有源光双稳器件

本文报道一种光电混合集成的有源双稳态器件,它仅由一只半导体激光器,两只PIN光电探测器及几只电子元器件构成.实验上得到了光学迟滞回线,显示了光开关、光存储、光脉冲整形等功能.文中简述了器件工作原理,光电混合集成制作工艺技术及性能指标.     

Atomic Absorption Spectrophotometry with the Absorption Tube Technique

A device to increase the sensitivity of the atomic absorption spectrophotometric measurement by elongating the absorption path length has originally been developed by Fuwa and Vallee and the present authors called it “absorption tube technique”. Although the technique has been fully described in comparison with the flame photometry, and the behavior of the elements and the reactions in the tube were investigated for several elements, application of a newly designed ring burner to this technique and the detailed examination of the operating conditions have never beer, published.     

有机发光二极管光取出技术研究进展

有机发光二极管(OLED)在通信、信息、显示和照明等领域均显现出巨大的商业应用前景,十几年来一直是光电信息领域的研究热点之一.但是,OLED的外量子效率远低于内量子效率,极大程度地制约了其发展和应用.本文主要介绍了多种有效提高器件效率的光取出技术,对微透镜、光子晶体结构、纳米图案和纳米多孔膜以及微腔技术等多种OLED修饰方法进行了回顾和讨论.在此基础上,对一些光取出技术的研究做了展望.     

带有反馈稳定控制的全光纤可调光滤波器

本文研制了带有反馈稳定控制的全光纤可调光滤波器,并从理论上进行了推导和分析.实验结果与理论分析完全相符.最后,讨论了该器件的一些可能的应用.     

小型加速器质谱系统研制及分析技术研究

加速器质谱(AMS)是测量长寿命放射性核素灵敏度最高的分析技术,在环境、地质、考古、物理等领域有着广泛应用。近年来,AMS装置的小型化在国际上得到了很大发展。为了研发小型化AMS装置及其分析技术,中国原子能科学研究院分别自主研制了加速电压为0.2 MV的单极型AMS装置和端电压为0.3 MV的串列型AMS装置。基于研制的单极型AMS装置,成功开展了14C的高效传输和本底排除技术研究,实现了14C的高灵敏测定,14C/12C的测量灵敏度达到2×10–15;利用研制的串列型AMS装置,开展了低能量下129I的气体剥离条件、本底排除和探测方法研究,建立了129I的高效传输和高灵敏测量方法,129I/127I的测量灵敏度为1×10–14。这是国内首次研制成功小型AMS装置,为AMS国产化奠定基础。     

Current–voltage and capacitance–voltage studies of nanocrystalline CdSe/Au Schottky junction interface

Journal of Nanoparticle Research - CdSe nanocrystalline thin films have been synthesized on indium tin oxide (ITO) substrates by an electrodeposition technique. A Schottky junction device in the...     

Flexible and transparent resistive switching devices using Au nanoparticles decorated reduced graphene oxide in polyvinyl alcohol matrix

We have investigated the resistive switching mechanism in solution processed Au-reduced graphene oxide-polyvinyl alcohol (PVA) nanocomposites on flexible substrates. Monodispersed gold nanoparticles (Au NPs) attached to reduced graphene oxide (RGO) in aqueous PVA solution have been synthesized using a novel one pot technique. The fabricated hybrid device showed high On/Off switching ratio more than 10³ with low operating voltages. The performance of hybrid device can be effectively enhanced over control RGO device. The switching mechanism occurs from the electrochemical reduction/oxidation process of partially reduced graphene oxide. The proposed devices reveal superior asymmetric bipolar resistive switching characteristics attractive for solution processable flexible and transparent non-volatile memory applications.     

Optical applications of ion beam machining

It is now apparent that ion beams have a role to play in the machining and polishing of optical components. In this paper we review some of the applications which have been reported so far and also consider future applications. Since ion beam machining is not a passive process we consider the topographies which are generated by the technique and their relevance to device manufacture.     

透射电子显微镜样品的电解抛光制备方法

在电解抛光过程中用透射和反射光作显微镜观察,借以监视抛光样品,使获得最佳抛光条件。电路中采用了间歇电流装置,使抛光条件更易于控制。样品制备的成功率和重复性有所提高。制备了一些超导材料和非晶质材料的透射电子显微镜样品,拍摄了透射电子显微镜和选区电子衍射照片。 关键词：     

数字微镜器件在视频全息中的应用

为研究数字微镜器件在视频全息中的应用,探讨了基于数字微镜器件的全息编码方法。基于数字微镜器件的微观物理结构,讨论二维离散微镜像素结构、开态微镜列的闪耀光栅特性和脉宽调制的微镜偏转工作原理。将数字微镜器件分辨力、微镜尺寸、间隔、旋转角度、参考光入射角以及衍射条件等因素结合到计算全息编码中,提出干涉面抽样方法、相位补偿技术和无偏置二元全息编码方法,使产生的计算全息图适应数字微镜器件独特的空间光调制特性和计算视频全息的要求。实验表明,该方法调整了重构物光波的衍射方向,集中了衍射光在重构像中的分布,增加了成像清晰度和光能有效利用率,提高了全息编码效率。     

1.5 μm Ti:LiNbO3电光波导强度调制器

用钛内扩散技术和常规光刻手段,研制出1.5μmLiN_bO₃电光波导强度调制器。它由单模波导非对称Mach-Zehnder干涉仪和三电极共平面波导组成。干涉仪的两个臂长相差波导波长的四分之一,使器件在最佳线性点工作,无需外加电偏压。集总调制和行波调制的理论带宽分别为1GHz和7.8GHz。对于集总器件,测量了调制特性,半波电压为9.5V,调制带宽为0.7GHz。     

A new technique for measuring radon exposure at working places

A new technique has been developed based on passive diffusion sampling and alpha track detection for monitoring radon exposure at working places. It is based on a device to be turned on and off at monitoring sites to permit accurate measurements of timed exposures. This technique is useful for radioprotection applications on personal and area monitoring of radon volume activity: timed measurement intervals and addition of sequential exposures. Additionally, the device allows accurate calibration with the application of radon reference atmospheres. Calibration facilities have been realized which allow starting detector exposure only at stationary conditions to avoid effects of varying radon concentration during exposure of passive integrating detectors. The contribution of the initial transient to the overall exposure ranged from about 3% to 10% according to calibration protocol. Experimental data evidence better performances of this new technique with respect to other measuring devices for integrating measurements based on radon diffusion samplers and polymeric nuclear track detectors (CR-39, LR-115 and polycarbonate). A better accuracy of calibration factor is obtained. The technical apparatus is presented and preliminary results described.     

有机分子束外延技术与研究进展

本介绍了超高真空分子束外延生长有机薄膜的技术及基研究进展,讨论了外延材料的纯化过程和杂质对外延薄膜的影响;从理论和实验观点评论了薄膜的生长性质和膜的有序结构。超高真空有机分子束外延技术是一种多用途的高技术,可以生长有机、无机、有机／无机混和的薄膜结构。这种薄膜结构是示来光学和电子器件有希望应用的新一类工程材料。     

有机分子束外延技术与研究进展

本文介绍了超高真空分子束外延生长有机薄膜的技术及其研究进展 ,讨论了外延材料的纯化过程和杂质对外延薄膜结构的影响 ;从理论和实验观点评论了薄膜的生长性质和膜的有序结构。超高真空有机分子束外延技术是一种多用途的高技术 ,可以生长有机、无机、有机 /无机混和的薄膜结构。这种薄膜结构是未来光学和电子器件有希望应用的新一类工程材料。     

Cost-effective fabrication of memristive devices with ZnO thin film using printed electronics technologies

A prototype memristive device has been presented in this paper, for which the top and bottom electrodes have been fabricated through a simple and cost-effective technique, i.e. electrohydrodynamic printing. For deposition of the bottom electrode pattern, a silver ink containing 60 wt% silver by content was subjected to controlled flow through a metal capillary exposed to an electric field at the ambient temperature to generate an electrohydrodynamic jet, thereby depositing uniform patterns of silver on glass substrate at a constant substrate speed. The top electrode has been deposited in a similar fashion. In between the top and bottom electrodes, a uniform layer of ZnO is fabricated using spin-coating technique. The nanoscale ZnO memristor stack has a channel length of 370 μm and channel width of 82 μm. A memristor thus fabricated was characterized and its current voltage curves were analyzed. The device showed a typical nonvolatile resistive switching behavior present in memristor devices thus highlighting the EHD printed patterning as a reliable method for the fabrication of memory devices.     

A linear Paul trap for radiative lifetime measurements on ions

A linear ion trap has been designed for collimation and storage of ions from an effusive particle beam generated in a hollow cathode discharge. The motivation is to measure radiative lifetimes on multiply ionized atoms by using the time-resolved laser-induced fluorescence technique. The trap has been tested on iron and tungsten ions both as an ion guide and also as a storing device. Radiative lifetimes have been measured in the trap with a remarkably higher signal-to-noise ratio than in the original effusive atom beam.     

Application of the Nuclear Reaction Analysis Online Technique to Study the Diffusion of Deuterium in Metals

Nuclear reaction analysis online technique has been applied to study the diffusion of deuterium in metals. Investigations ensuring the application of the new method have been performed. These investigations include the development of a device for diffusion annealing of samples in the chamber of an accelerator and an algorithm for taking into account the effect of radiation defects on the diffusion coefficients. Test measurements of the diffusion coefficients of deuterium in nickel in the temperature range from 130 to–60°С have been performed. For negative temperatures, experimental data on the diffusion of a hydrogen isotope in a metal have been obtained for the first time by a direct method and it has been shown that the online nuclear reaction analysis provides reliable data.     

Generation of 1.5-12 ns width-tunable 532 nm pulses by adopting laser-induced plasma shutter technique

The pulse-shaping technique has found widespread applications in nonlinear optics and material processing. Experimental research on laser-induced plasma shutter to control the 532 nm pulse width is conducted. The impacts of the total pulse output energy on pulse compression are investigated, and a useful conclusion can be drawn that there exists an optimal value of pulse energy at which the shortest output pulse of 3.23 ns can be obtained without a device for delay-time. Once the device for delay-time is employed to change the optical differences between two laser paths, the pulse width can be further shortened to 1.51 ns. In short, the 1.5-12 ns width-tunable 532 nm laser pulses have been obtained by adopting the laser-induced plasma shutter technique.