This study examined the influence of Bacillus subtilis adhesion on the corrosion and cavitation erosion resistance of high-velocity oxy-fuel (HVOF) sprayed WC-10Co-4Cr coatings. The polished HVOF-sprayed WC-10Co-4Cr coatings were divided into two groups: one immersed in artificial seawater (ASW) and the other immersed in ASW containing Bacillus subtilis (BASW). Following an immersion period of 42 days, chromium oxide was detected on the ASW-immersed coating according to x-ray diffraction, while the BASW-immersed coating showed no signs of oxidation or corrosion. Electrochemical testing indicated compromised corrosion resistance in both the coatings. Nonetheless, the corrosion resistance of the BASW-immersed coating was much better than the ASW-immersed coating, suggesting that the Bacillus subtilis biofilm protected the coating surface from the corrosive substances in ASW, such as chloride ions and oxygen. Cavitation erosion testing revealed that prior immersion in ASW accelerated the erosion process, while the BASW-immersed coating displayed better resistance to cavitation erosion due to the inhibited corrosion attained by the Bacillus subtilis biofilm.

In order to test and calibrate the satellite payloads-electron detectors, the medium- and high-energy electron accelerators with extremely weak beam current to simulate the space electron radiation environment have been developed, including the experimental terminal which has a vacuum chamber and a vacuum rotation plate. All above form a system which is so-called National Space Science Center-Space Electron Facility, for short “NSSC-SEF”. The main specifications are electron beam energy range 10 2000 keV, beam current 103 109/(cm2 s), beam spot Ø50 mm, beam un-uniformity < 10

海洋生物容易附着和生长于沿海电力设施装备表面,其代谢过程及产物能够引起表面金属材料的腐蚀加速、电力设施的老化破损,进而造成巨大的危害和经济损失,因此降低和抑制电力设施表面生物污损的涂层防污技术有着重要的研究与应用价值.基于热喷涂的防污涂层制备技术是防生物污损腐蚀的重要方法 之一,是未来将研究工作应用于实际的重要方向.截至目前,有关电力设施装备生物腐蚀现状和热喷涂表面防护的研究进展尚未见报道,这里将对电力设施装备生物污损腐蚀现状、应用案例及热喷涂防污措施研究进展进行归纳整理,并进行系统性综述.首先介绍了不同深度近海区域电力装备生物污损和腐蚀的现状、特点,引用了近年来典型电力设备涂装防污损的技术方案和应用案例,然后依据不同的技术特点和发展趋向,对近10年来热喷涂制备的复合防污涂层研究进展进行了综述,分析其在沿海电力设施防护方面的应用前景,以期为未来电力设施防污损等研究工作起到一定指引作用.

防冰涂层材料可有效减轻自然界结冰现象的影响,其通过防冰材料低表面能或高润滑性的特点,降低在低温严寒天气条件下物体表面冰的粘附强度,延迟材料覆冰时间,减少表面覆冰量,在保护电力材料免受冰冻灾害影响方面有着重要应用价值.基于热喷涂法制备的复合型表面防冰涂层材料,以及主被动相结合的防覆冰方法,是未来电力材料防覆冰应用发展的重要方向.然而截止目前,有关复合型表面防冰涂层材料的热喷涂制备,以及涂层在电力材料防冰中应用的研究进展综述鲜见报道.从超疏水材料与光热、电热除冰相结合的除冰方式,及超疏水-超润滑复合材料实现防冰除冰的角度出发,对近年来国内外复合防冰涂层的制备及性能的研究进展进行了综述,并重点讨论了适合于热喷涂制备的复合型涂层的防冰除冰效果.最后,讨论了超疏水防冰涂层、复合型防冰涂层在电力材料表面防覆冰方面应用的研究进展,并对热喷涂法制备防冰涂层在的局限性问题进行了总结,对其应用前景进行了展望,希望在复合型防冰方面进一步开展研究,为电力材料表面防冰涂层的未来发展提供指导.

Due to the uniform structure, excellent corrosion resistance, the amorphous alloy coating material has an important application value in the protection of power facilities. Amorphous alloy coating material based on thermal spraying is an important development direction of protection methods for power facilities. Therefore, this paper will present a timely and comprehensive review by summarizing and sorting out the relevant research papers. Several important amorphous alloy material systems are introduced firstly, and the preparation methods of amorphous alloy coating materials based on thermal spraying technology are also cited. In addition, a series of research works on anti-corrosion and anti-erosion performance and mechanism are systematically reviewed. The research progresses of iron, nickel and aluminum based anti corrosion amorphous materials system are introduced. Finally, the application and future development of Fe-based and Nickel-based amorphous coating materials prepared by thermal spraying in anti-corrosion of power facilities are prospected.

It is a hybrid design spectrometer with MWIR zooming and spectral imaging. The system realizes the searching in large field of view and recognition in small field of view which can resolve the difficulty that the target and background of spectrometer are not easy to distinguish in a single field of view. It also decreases the difficulty of spectral analysis and data dimension reduction. The collimating light beam modulated by AOTF (acousto-optic tunable filter) provides a basis for the subsequent spectral analysis. The optical system realizes three times zoom from 160mm to 480mm. The simulation achieves the effect imaging result. Experiments show that the system has both imaging and spectral recognition capabilities.

针对在循环检测过程中不同的工件表面特征易出现变化而难以检测的问题,提出了一种基于机器视觉的游艇换挡执行机构卡簧装配缺失检测方法.通过对采集的图像进行预处理、边缘检测、轮廓提取、轮廓拟合定位、掩模屏蔽、二值化及形态学滤波等操作,将图像中卡簧特征未发生明显变化的区域分割出来,利用该特征区域像素数量来检测卡簧的装配完整性.对轮廓的拟合定位部分和传统的霍夫圆检测定位方法做了对比,结果表明,利用传统的霍夫圆检测定位方法平均运行时间为13.99 ms,但定位准确率只有87.33％,而基于机器视觉的检测方法平均运行耗时为12.56 ms,定位准确率达到98.7％,因而能够实现较好的检测效果.

Slippery liquid infused porous surfaces (SLIPS) have been extensively studied, which are a type of nepenthes pitcher-inspired materials with excellent self-cleaning and antifouling performance. However, their practical usage is limited by factors such as complicated preparation process, high cost and inconvienence for large-scale preparation. Here a facile manufacturing process was successively established to prepare nano-titanium dioxide-based SLIPS coating on the surface of stainless steel by flame spraying technology. The microstructure and antifouling properties of the prepared SLIPS coating was analyzed. The morphology and microstructure of the coating were examined by scanning electron microscope. The wettability of the coating was analyzed by contact angle instrument. The anti-biofouling performance was evaluated by the settlement of a typical marine biofouling organism Chlorella vulgaris. Results show that the surface contact angle and sliding angle of water droplets on the prepared SLIPS coating reach 118.01 degrees and 4.54 degrees, respectively. The adhesion rate of marine Chlorella is significantly reduced by 98.56%. It provides a feasible approach for the fabrication of low-cost and large-scale SLIPS coatings.

A three-dimensional all-in-one Sn-Co alloy anode is reported for the first time, which delivers a high capacity along with a stable coulombic efficiency as well as good temperature tolerance. The binder-free electrode eliminates the complexity of conventional slurry preparation while maintaining an integrated scaffold, which provides space to accommodate volume expansion, as confirmed by an in situ transmission electron microscopy study.

在同步辐射光源,实验站光束稳定性是衡量光束线的重要指标,它是用户获得高质量实验数据的前提.为了评价上海光源小角X射线散射实验站(BL16B1)光束稳定性,首先在样品台附近安装用于检测光束中心位置和光束强度的IC-500-50位置灵敏电离室,同时使用CAENels公司的TetrAMM四象限皮安计实时检测IC-500-50电流,然后通过移动Kohzu垂直方向电机改变电离室与入射光束的相对位置,从而测试IC-500-50的线性范围和灵敏度等主要性能参数,最后通过静止保存电流值计算光束中心位置并最终得到BL16B1光束稳定性指标.测试结果表明:BL16B1垂直方向光束中心位置抖动的标准偏差为0.8％,光强抖动的标准偏差为0.44％,最终计算分析得知1％之内的不稳定性满足光束线稳定性设计指标(10％之内)的要求.

The control software of normal sample stage,grazing-incidence small-angle X-ray scattering(SAXS)sample stage and temperature stage and the program for data acquisition were all developed in LabVIEW environment in small angle X-ray scattering beamline of Shanghai Synchrotron Radiation Facility.Based on stepper motor,slits control system was developed in Experimental Physics and Industrial Control System(EPICS)which is a distributed control system.Due to different environments,the network transmission delay occurs at the communication between these devices.In the present work,the software of the system was developed in EPICS and the control of motor,data acquisition of detector and light intensity detection were integrated and formed a unified graphical user interface(GUI).The operation of GUI is simple and convenient and can greatly improve the efficiency of the experiment and was stably applied in SAXS beamline.

High energy density Li-ion batteries have attracted broad attention due to their great significance for various applications ranging from portable electronics to electric vehicles. However, emerging applications require batteries with greater than currently available energy densities, which have motivated numerous research efforts such as investigations on high energy density active materials, and engineered electrode structures that maximize the capacity. Three- dimensional (3D) graphene provides promising pathways for developing high energy density electrodes including cathodes and anodes, because of its potential for providing a conductive 3D network, improving Li+ ion and electron transfer, as well as accommodating the structure and volume change during cycling. In this review, recent research efforts particularly focused on 3D graphene-based nanocomposite electrodes which exhibit high energy density, high capacity, and good rate performance have been summarized comprehensively. The current challenges for high energy density Li-ion batteries have been discussed, while the potential research perspectives have been presented as well, which we hope would inspire high-performance battery investigations.

In order to test and calibrate the satellite payloads—electron detectors,the mediumand high-energy electron accelerators with extremely weak beam current to simulate the electron radiation environment of space have been built,including the experimental terminal which have a vacuum chamber and a vacuum rotation plate.This work focuses on the physical design and simulation of extremely weak,uniform,parallel electron beam of the medium-energy one,by using electron trajectory program Egun.The simulation results of electron trajectory in the initial focusing system,the accelerating tube and the twice beam broaden on different conditions including without grid,with ideal grid and with 1 mm diameter aperture grid in the spherical electron gun are presented.Finally,the beam density,105～109 cm-2.s-1 within the φ50mm target area,can be weakened by 8 orders of magnitude from the electron gun to the target area,and could satisfy the requirement of electron detectors testing and calibration experiment.

为实现下肢康复外骨骼机器人步态相位的稳定切换,通过压力传感器,编码器,陀螺仪以及拐杖按钮检测单元构建的感知系统实时采集人体步态运动信息,先根据足底压力信号的标志性事件将人体步态周期依次序划分为四个相位,然后对不同相位的运动状态切换进行具体研究。针对人体行走过程中支撑腿与摆动腿的切换判断,提出基于学习矢量量化(LVQ)的神经网络模型。将整个步态相位切换模型嵌入控制程序中进行在线测试,结果表明该模型实时性好,识别率高,能够实现稳定柔顺的步态切换。

We demonstrate a 64-Gbps carrier-depletion modulator which also can be used to generate the PAM-4 optical signal. This proves that the silicon optical modulator is suitable for different kinds of applications.

We demonstrate a directed XNOR/XOR optical logic circuit based on silicon Mach–Zehnder interferometer. The device with the symmetric arm design is wavelength-insensitive in a wavelength range of 40nm. The device has an electro-optical bandwidth of around 20GHz. When the device is optically biased at the maximum or minimum transmission points by tuning the heater on one of its arms, it can perform the XNOR or XOR operations respectively at a speed up to 20Gbps. The high-speed and reconfigurable abilities of the device make it suitable for the future programmable optical logic array.

This paper presents a T-shaped MIMO radar imaging system for use within a Blast Furnace. A T-shaped MIMO antenna array consisting of 32 antenna elements has been developed. A dielectric loaded waveguide is employed as the antenna element. The antenna has good mechanical hardness and is resistant to dust and high temperature. A cooling system, employing a combination of Nitrogen and water, has been designed for this application. The function of cooling system is to maintain the temperature inside the radar between 30 degrees C and 65 degrees C whilst the outside temperature varies from 80 degrees C to 200 degrees C. A pilot study has been conducted using a prototype version of the radar system installed upon the coke surface. In this way it was possible to obtain measurement results concerned with a real burden surface distribution. These results have been carefully compared with results obtained via computer simulation.

We demonstrate a reconfigurable non-blocking 4-port silicon thermo-optic optical router based on Mach-Zehnder optical switches. Each optical link of the router can manipulate 50 wavelength-division-multiplexing channels with the data-rate of 32 Gbps for each channel.

To make industrial robots and intelligent mobile platform available in the field of high-tech field which needs precise assemblage and operation,a high-precision stereo vision detection approach was proposed.Laser features were used in Harris corner detection,therefore feature detection was much more precise.The rude level detection was done by image pyramids struc-ture features based on direction vectors of images which got from two low resolution cameras together with line laser features from a high-speed laser scanning equipment.High-precision detection was achieved using both the displacement information of the laser and the image ROI (region of interest)features based on priori knowledge got from a high resolution monocular camera. Compared with the traditional method,the proposed method generates more accurate feature extraction result with less time con-sumption of the detection algorithm.

Laser array with the scale of 1 ×16 for optical vector-matrix multiplier as long as its driven circuit was designed and implemented. A 1 ×16 laser array was constructed by coupling 16 commercial discrete distributed feedback (DFB) lasers with a 1×16 fiber array. Calibrating module adopting feedback algorithm was equipped with the laser array driven circuit, successfully solving problems encountered due to differences of threshold current and P-I conversion efficiency among lasers of the same type. And the same mapping relationship was acquired between the input vector and output intensity power among different channels of the source array. The proposed light source array system together with its driven circuit not only reduces cost, but also possesses excellent high-frequency response,ensuring the stability and accuracy of the optical vector matrix multiplier′s computing performance.