aaaselect * from OA left join Issue on OA.Issue_No=Issue.Issue_No left join Iuuse_Year on Issue.Issue_Year=Iuuse_Year.Issue_Year where OA.Issue_No='2018年1期' order by Page_Num 纳米技术与精密工程 /nm/oa Study on SERS Substrates Fabricated by Spin Self-Assembly Colloidal Nanospheres /nm/oa/darticle.aspx?type=view&id=2018101 The Au film over nanosphere (AuFON) surface-enhanced Raman scattering (SERS) substrate was fabricated by ion-beam sputtering deposition on the spin self-assembly nanospheres template. Firstly, the paper theoretically calculated the required concentration of monodisperse nanospheres of different materials and different diameters in the spin self-assembly process. The SERS substrate’s surface morphology was observed by scanning electron microscopy(SEM). SERS substrate fabricated by ion-beam sputtering deposition had a uniform hexagonal arrangement with nano-gaps of about 10 nm using a nanosphere concentration close to the theoretical calculation. Raman characterization results show that the SERS substrate with uniformly hexagonal arrangement had a better performance. Spherical structures with diameters of 200 nm and 400 nm were simulated by finite-difference time-domain (FDTD) method. FDTD simulation results show that when the gap between spheres was 10 nm, the spherical structure with the diameter of 200 nm had a higher electromagnetic field enhancement. The smaller nanospheres had a higher hot spot density and better SERS enhancment performance, which was consistent with the Raman characterization in the experiment. 2018年03月15 00:00 2018年1期 1 8 2589860 Chen Jinping, Pei Junyan, Xu Zongwei Effect of Surfactants in Aqueous Solutions on Oil-Resisting Performance of Membrane Surfaces with Charges by Atomic Force Microscopy /nm/oa/darticle.aspx?type=view&id=2018102 The state of the surface of oil droplet can be changed obviously by adding a small amount of surfactant in water. The oilresisting performance of membranes for water/oil separation has a significant influence on filtration efficiency and life span. The atomic force microscope (AFM) is commonly utilized to explore interface interaction. In this paper, the probe modified by an oil (hexadecane) droplet was used as a force sensor to detect adhesion forces between oil and the charged membranes in fluid. Under low concentration of cationic surfactant in water, the adhesion between oil and the nanofiltration (NF) membrane with negative charges was intensified, increasing from 91.04 nN in pure water to 152.33 nN. On the contrary, the low concentration of anionic surfactant resulted in lower adhesion, which decreased from 5.10 nN in pure water to 3.13 nN in this situation. The measured force behavior agreed well with experimental observation from contact angle measurement. However, the high percentage of ionic active agent caused lower interaction in the above two cases. Moreover, the effect of the nonionic active agent on the adhesion between oil and two kinds of charged membranes was also discussed. Results show that the interaction would be weakened with the aid of the nonionic active agent in water, regardless of the positive or negative charges on the membrane surface. 2018年03月15 00:00 2018年1期 9 15 1925932 Hu Xiaodong1, Han Jing 1, Xu Linyan1, Qian Shuangbei1, Guo Tong1, Wu Sen1, Liu Yanan2, Jiang Zhongyi2 Simulation of Nano Metal Film Thickness Measurement Based on Surface&nbsp;Plasmon Resonance Effect /nm/oa/darticle.aspx?type=view&id=2018103 In this paper, a mathematical model based on surface plasmon resonance (SPR) is presented to measure the nano metal film thickness with the coupling device of Kretschmann configuration composed of K9 prism-gold film-air. The principles of intensity, phase, wavelength and angle modulation modes are introduced and numerically analyzed. The measurement ranges and sensitivities of these four types of sensors are discussed. Results indicate that the SPR intensity detection method enjoys the widest measurement range and the SPR phase detection method shows the highest sensitivity. In practical application, not only the measurement range and sensitivity of sensor type, but the follow-up processing device, the complexity of the algorithm and cost-effective factors should be considered to select the appropriate SPR sensor to meet the thickness detection demands for the thin metal film. 2018年03月15 00:00 2018年1期 16 22 1605400 Liu Qinggang,Xie Xian,Qin Zirui,Lang Yaopu A Simple Stable Inertial Nanopositioner with Piezoelectric Stacks /nm/oa/darticle.aspx?type=view&id=2018104 To build a simple and stable nanopositioner which can reduce the complexity of the scanning probe microscopy (SPM) system, a novel inertial nanopositioner with piezoelectric stacks is presented. The nanopositioner adopts two piezoelectric stacks and one sawtooth driving signal to achieve movement. The two piezoelectric stacks are set in the adjustable direction, and are then fixed on the base. The insulated rail is fixed between the free sides of the two piezoelectric stacks, and the central shaft is pressed by four SiN balls and one CuBe spring in the insulated rail. By applying one sawtooth wave on the piezoelectric stacks, the insulated rail can drive the central shaft to move a nanometer in distance due to its inertance. Experimental results indicate that the nanopositioner can realize nanometer precision fine-tuning and centimeter range coarse adjustment in any direction. The nanopositioner enjoys high compactness and excellent mechanical stability, so it can be easily implanted into precision optical systems and SPM systems. 2018年03月15 00:00 2018年1期 23 27 1116521 Pang Zongqiang, Zhang Yue, Zhou Zeqing, Rong Zhou Compensation for Deformation of Turned Ultra-Thin Parts /nm/oa/darticle.aspx?type=view&id=2018105 Ultra-thin parts are widely used in various areas such as micro-devices and photonic systems that require high form accuracy. Considering the difficulty in reducing deformation after unloading, this paper presents a method of compensation to machine ultra-thin parts based on ultra-precision turning. To realize this, the compensation theory and methodology of deformation error are put forward. An in situ measurement system is established with a displacement measurement device, and an off-line surface shape is added to the in situ surface figure to achieve final compensation. Then, the three-axis servo control technique is applied to cut the final surface. The compensation experiment is performed on an ultra-thin aluminum alloy part with a diameter of Φ20 mm and a thickness of 0.1 mm, and the peak-to-valley (PV) value is decreased from 15μm to 10μm after one compensation. Two specific errors in compensation, the in situ displacement measurement error and the position deviation error, are discussed to examine the influence of compensation accuracy to achieve a high-quality figure. 2018年03月15 00:00 2018年1期 28 33 1508231 Cao Yue, Fang Fengzhou A New Method for Correction of Radial Metal Artifacts in CT Images /nm/oa/darticle.aspx?type=view&id=2018106 In computer tomography (CT) techniques, scattering and beam hardening may render radial artifacts in CT images that affect disease diagnosis, interfering with the dose calculation in radiotherapy and so on. To minimize the impact of metal artifacts, a new method based on polar coordinate transformation is proposed for the correction of X-ray metal artifacts that arise from dental fillings. The proposed algorithm converts radial artifacts into linear artifacts through polar coordinate transformation. Then a two dimensional image filtering in the frequency domain is designed to filter out the linear artifacts. Quantitative study with data of 11 patients applying the standard deviation and the average CT value difference shows that the proposed algorithm can reduce the radial metal artifacts in the CT image to a certain extent, and retain the edge information of images as well. 2018年03月15 00:00 2018年1期 34 40 1968700 Feng Yuanming1,2,3, Lin Jie1,2, Guo Yu1,2, Sa Yu1,2, Lü Yangsheng1,2 Enhancement of MSCT Vascular Image Based on Fast Hessian Matrix /nm/oa/darticle.aspx?type=view&id=2018107 Conventional filtering methods of the Frangi tubular structure is restricted by large computational complexity as well as time-consuming issue. In this paper, a filtering algorithm based on fast-Hessian matrix is applied to solve the above problems, which can perform enhancement filtering on the coronary artery in the MSCT images. After analyzing the conditions of the Hessian matrix polynomial coefficients, the elements that fail to meet the predefined conditions are picked out and classified as non-vascular elements, which will be neglected during the process of calculating the Hessian matrix eigenvalue. Thus, both the computational complexity and the filtering time will be reduced. Experimental results show that this algorithm can reduce the average filtering computational time to 30.63% of the traditional Frangi algorithm, with the similarity of the tubular structure in the effective evaluation image well preserved. 2018年03月15 00:00 2018年1期 41 47 1770166 Wang Liyao1, Wang Yi1, Chen Xiaodong1, Zhao Cong1, Zhang Jiachen1, Jia Zhongwei2 , Chen Xiangzhi3 , Yu Daoyin1 Time Domain Subdivision Method for Optical Grating Signal Based on Time Series Analysis<br /> /nm/oa/darticle.aspx?type=view&id=2018108 Aiming at the restriction of the Moire signal quality on the subdivision multiple and accuracy, a time domain subdivision method for optical grating signals based on time series analysis is proposed. The relationship between the grating pitch and the sampling period is utilized to transform the equal space intervals into time series. A time domain prediction model is established based on the autoregressive model of time series analysis to predict the sampling time, and the parameters of the model are calculated using the maximum likelihood estimate method. Experimental results indicate that the subdivision errors both achieve ±2.4″ when the subdivision multiples are 400 and 800, respectively. This subdivision method reduces the reliance on grating signal quality, proving certain application value. 2018年03月15 00:00 2018年1期 49 53 1556364 Wang Baozhu1, Li Wenjuan1, Peng Kai2, Wang Qiang1, Li Meili1 Effect of Al2O3(0001) Vicinal Surface Substrate Temperature on the Alignment of PTCDI-C5 Islands /nm/oa/darticle.aspx?type=view&id=2018109 The morphologies of N, N′-dipenthyl-3,4,9,10-perylene tetracarboxylic diimide (PTCDI-C5) thin films on the α-Al2O3(0001) substrate were investigated as a function of substrate temperature. The PTCDI-C5 thin films with a nominal thickness of 0.6 nm were deposited on the substrate by molecular beam epitaxy in an ultrahigh vacuum chamber with a base pressure lower than 6 × 10-7 Pa. During deposition, the substrate temperature was controlled at 25 ℃, 37 ℃, and 61 ℃, respectively. The morphologies of PTCDI-C5 thin films were characterized ex-situ by atomic force microscope (AFM) in the tapping mode at room temperature. AFM images showed that the PTCDI-C5 molecules formed islands on Al2O3 substrate, and the arrangement of PTCDI-C5 islands showed dependence on the substrate temperature during deposition. Under our experimental conditions, a substrate temperature threshold between 25 ℃ and 37 ℃ was observed. When the substrate temperature during deposition was lower than the temperature threshold, the PTCDI-C5 islands randomly distributed on the surface. On the contrary, when the substrate temperature during deposition was higher than the temperature threshold, the PTCDI-C5 islands aligned themselves along the step edges on the Al2O3 (0001) surface. 2018年03月15 00:00 2018年1期 54 58 1814629 Li Yuxi1, Li Yanning1, Wei Yaxu1, Wu Sen1, Hu Chunguang1, Sun Lidong2, Hu Xiaotang1 An Efficient and Flexible Camera Calibration Technique for Large-Scale Vision Measurement Based on Precise Two-Axis Rotary Table /nm/oa/darticle.aspx?type=view&id=2018110 A novel camera calibration technique is presented in the field of large-scale vision measurement, which employs a precise two-axis rotary table and a single stationary optical reference point. By moving the camera at different angular positions of the rotary table, and simultaneously taking photos of the stationary optical point in front of it, a precise angular control field is established for calibration. This technique brings such advantages as: there is no need to know the location relationship among the camera, the reference point and the rotary table previously; the whole course of calibration is processed by computer program automatically; and this method adapts to different imaging systems and measuring tasks easily by adjusting the rotating range of the rotary table and the distance from the reference point to the camera, so that the calibration space and the measurement space coincide with each other. Calibration experiments verify that the proposed method has high accuracy. 2018年03月15 00:00 2018年1期 59 65 1829787 Gao Yang, Lin Jiarui, Chen Jiaqi, Xu Qiuyu Numerical Simulation of the Effect of Gravitational Direction on Particle Deposition in Pulmonary Acinus under the Condition of Breath Holding /nm/oa/darticle.aspx?type=view&id=2018111 A two-dimensional CFD simulation is conducted to study the effect of the gravitational direction on particle deposition in pulmonary acinus when the breath is held for a short time. The results show that for the large particles (particle diameters of 1 μm, 2 μm, and 3 μm), gravity is the dominant force, and for the small particles (particle diameter of 0.01 μm), the Brownian force is significant. Under the action of either force, the deposition time of particles is short and an equilibrium state can be reached quickly. However, for the medium-sized particles (particle diameters of 0.1 μm and 0.5 μm), the deposition time of particles is elongated because both gravity and Brownian force become weak. Meanwhile, the directions of applied gravity relative to the pulmonary acinus affect the deposition zone of these particles. Therefore, the gravitational direction has no effect on the total deposition fraction of the pulmonary acinus, but can change the local deposition fraction. Applying gravity along the +x direction would increase the local deposition fraction in some specific generations in comparison with the situation along the -y direction. The present study can provide a reliable theoretical basis for further studies on pulmonary mass transport and inhalation therapy. 2018年03月15 00:00 2018年1期 66 72 1680810 Wu Tao, Zhang Hongyan, Cui Haihang Applicability of Pipe Leak Detection Method Using Transient Damping /nm/oa/darticle.aspx?type=view&id=2018112 The leak in pipeline leads to damping of transients. Solving the governing equations of pipeline and expressing the result in Fourier series, the harmonic components are found damped differently in the presence of leaks, which comes up with a method to locate the leak by implementing an excitation to the pipe, obtaining the pressure signal, and calculating the damping ratio of different components. The existing solution could detect leaks under experimental conditions and some specific real pipe systems. But in practice, the complicated situation in different pipes would bring about some factors which would impact the positioning result in different ways. In this paper, different situations in actual water transfer pipes are simulated using the software Flowmaster. The influences of different factors, including leakage point location, leak size, bends, excitation position, etc, on leak positioning accuracy are concluded and the applicability of the method is improved. 2018年03月15 00:00 2018年1期 73 78 1499736 Yu Yifei, Li Jian Compensation Algorithm of MHD Angular Rate Sensor at Low Frequency Based on Low-Pass Filter /nm/oa/darticle.aspx?type=view&id=2018113 To improve the low frequency(&lt;2 Hz) performance of magnetohydrodynamics(MHD)angular rate sensor, a low-pass filter algorithm was designed which optimized the model of complex frequency domain of the MHD angular rate sensor and compensated the error at low frequency in real time. The comparative experimental results show that the low frequency performance of the MHD angular rate sensor was greatly improved. The cut-off frequency in low frequency region was extended to below 0.05 Hz from 2 Hz. The relative error of amplitude in low frequency region decreased from 91% to about 1%, while the relative error of phase in low frequency region decreased from 85% to about 3%. At the same time, the sensor’s original high frequency performance remained unchanged. The algorithm was verified to be efficient. 2018年03月15 00:00 2018年1期 79 25 1681672 Zhou Xinli1, Li Xingfei1,Wu Tengfei1,Ji Yue2 Research on Self-Starting Esophagus Pacemaker System Based on ZigBee Communication /nm/oa/darticle.aspx?type=view&id=2018114 Based on the idea of applying functional electrical stimulation(FES) in the treatment of achalasia and postoperative gastroesophageal reflux, a self-starting esophagus pacemaker system based on ZigBee communication is designed in this paper. ZigBee communication and biphase voltage controlled constant-current sources are adopted in the system, which can realize the bi-directional ZigBee communication between the implanted stimulator and the extracorporeal controller, and can ensure the real-time control of the stimulation. Meanwhile, the bend sensor is applied at the front-end of the system to acquire swallowing signal and realize self-starting. Besides, the employment of low-power mode of MSP430F149 and the synchronous wake-up technology of ZigBee meet the low-power requirement of the system. The feasibility of ZigBee communication in this system is proved by a series of tests with different distances. Five volunteers attended in the swallowing signal acquisition and processing experiment. The results indicate that the voltage variation caused by the volunteers were 100%detected. The intensity, frequency and pulse width of the stimulation pulse generated by the core stimulator were measured with a high precision oscilloscope. The data indicates that the relative error between measured values and theoretical values is less than 2.08%. The esophagus pacemaker system was applied to the esophagus of rabbits, and the result reveals that a certain stimulation results in the contraction of the esophagus muscle,&nbsp; verifying the correctness of the design theory and the reasonability of the system. 2018年03月15 00:00 2018年1期 86 92 1669886 Jiang Xue1, Chen Xiaodong1, Wang Liyao1, Wang Yi1, Zhang Lili2, Wang Bangmao2, Yu Daoyin1 Design of Monocular Vision Target Tracking System Based on Lidar /nm/oa/darticle.aspx?type=view&id=2018115 To locate a certain point in space by lidar, a target point tracking system was designed and the angular position information of the target point was captured and fed back to the turntable to control it, aiming to adjust the laser position to point to the target point. To realize the design of the target tracking system, a series of programs were prepared, including a program for the camera to acquire the image coordinates of the target point, a program for obtaining the target point angular information, and a feedback control program for the turntable. Finally, the target tracking system was established to carry out experiments related to lidar spatial location. Experimental results show that when the original point and the target point were in the same vertical target imaging plane in the target tracking system within the range of 1 m to 15 m, the horizontal positioning error didn’t exceed 6.6 mm, the vertical positioning error was within 7.8 mm, and the vertical positioning error was always higher than the horizontal positioning error. This system is applied to the positioning of a certain point in space by lidar, basically meeting the requirement of positioning accuracy. 2018年03月15 00:00 2018年1期 93 100 2009087 Wu Bowen1, Zhang Fumin1, Qu Xinghua1, Zhang Tong1, Pei Bing2 Design of the Variable Length Photoelectric Reference Scale /nm/oa/darticle.aspx?type=view&id=2018116 Based on the characteristics of laser theodolite, a new kind of variable length photoelectric reference scale is proposed. It can orientate the laser theodolite measurement system quickly and accurately with the help of high-precision photoelectric position-sensitive detector (PSD). The orientation scheme based on this reference scale and the overall design project are presented. The structure of photoelectric reference scale, methods of calibration and calculation are given. Finally, a measurement system consisting of two Leica laser theodolites is established to validate the accuracy of this scale. The result indicates that orientated by the variable length photoelectric reference scale, the relative measurement error of laser theodolite system is 0.04%. 2018年03月15 00:00 2018年1期 101 105 1339361 Wu Bin, Liu Xin, Xing Xiukui, Yang Fengting Tribological Performance of Bioimplants: A Comprehensive Review /nm/oa/darticle.aspx?type=view&id=2018201 2018年03月15 00:00 2018年1期 107 122 6888143 Active-Thermal-Tunable Terahertz Absorber with Temperature-Sensitive Material Thin Film /nm/oa/darticle.aspx?type=view&id=2018202 2018年03月15 00:00 2018年1期 123 128 0 An Investigation on Efficient Acoustic Energy Reflection of Flexible Film Bulk Acoustic Resonators /nm/oa/darticle.aspx?type=view&id=2018203 2018年03月15 00:00 2018年1期 129 132 3363981 Electrostatic Actuating Bendable Flat Electrode for Micro Electrochemical Machining /nm/oa/darticle.aspx?type=view&id=2018204 2018年03月15 00:00 2018年1期 133 137 3694709 Analysis of Vibrational Performance of A Piezoelectric Micropump with Diffuse/Nozzle Microchannel /nm/oa/darticle.aspx?type=view&id=2018205 2018年03月15 00:00 2018年1期 138 144 5976363 An E-type Temperature Sensor for Upper Air Meteorology /nm/oa/darticle.aspx?type=view&id=2018206 2018年03月15 00:00 2018年1期 145 149 2867962 Self-Adaptive Grinding for Blind Tip Reconstruction of AFM Diamond Probe /nm/oa/darticle.aspx?type=view&id=2018207 2018年03月15 00:00 2018年1期 150 155 10682729