Key Laboratory for Micro Nano Technology and System of Liaoning Province

Dalian, China

Key Laboratory for Micro Nano Technology and System of Liaoning Province

Dalian, China
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Lou Z.-F.,Key Laboratory for Precision and Non Traditional Machining of Ministry of Education | Wang L.-D.,Key Laboratory for Precision and Non Traditional Machining of Ministry of Education | Wang L.-D.,Key Laboratory for Micro Nano Technology and System of Liaoning Province | Wang X.-D.,Key Laboratory for Precision and Non Traditional Machining of Ministry of Education | Ma Y.,Key Laboratory for Precision and Non Traditional Machining of Ministry of Education
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2011

The slippage between discs and rail is one of important factors for the measurement accuracy of an involute. However, control of frictions effectively can modify the slippage of discs. In the paper, frictions between discs and rail are analyzed respectively when a cord and a belt are used to drive the discs to roll. According to the analysis and experiment, it shows that if measuring forces are 0.7 N and 0.2 N and the base discs is drived by the cord and belt, frictions are 0.02 N and 0.07 N respectively, for the base disc clockwise rolled; where the effect of the slippages of based discs on the involute measurement can be ignored. Moreover, the slippage can also be reduced by increasing the weight of base disc groups, and measurement difference of involute is 0.06 μm when the rolling directions of the base discs are different.


Zhou Y.,Dalian University of Technology | Song X.-N.,Dalian University of Technology | Shu C.,Dalian University of Technology | Qiu J.-S.,Dalian University of Technology | Qiu J.-S.,Key Laboratory for Micro Nano Technology and System of Liaoning Province
Xinxing Tan Cailiao/New Carbon Materials | Year: 2011

Mesoporous carbons (MCs) were made from coal pitch derived from coal liquefaction residue with silica nanoparticles as template and CO2 as activation agent. The microstructure and electrochemical properties of the MCs were investigated with TEM, N2 adsorption, an electrochemical workstation and a Land battery test system. Results show that the specific surface area increases with activation time at 900°C under a CO2 flow rate of 100 mL·min-1. The specific surface area of MC activated for 150 min is 1360 m2·g-1 while that of the un-activated one is 722 m2·g-1. The specific capacitance of the MC activated for 150 min is 135 F·g-1 at a current density of 1000 mA·g-1 and the decrease in its specific capacitance is 7% after being charged and discharged 10000 times.


Le G.,Dalian University of Technology | Gao J.,Key Laboratory for Micro Nano Technology and System of Liaoning Province | Chu J.K.,Dalian University of Technology
Key Engineering Materials | Year: 2011

The methods of on-chip integrated testing have a wide application with the development of the study for MEMS materials properties measurement in microscale. A novel on-chip integrated micro-tensile testing system is designed through system-level simulation based on macromodels to measure the fracture strength and fatigue mechanical properties of polysilicon thin films. The structure of testing instrument consists of V-beam electrothermal actuator, differential capacitance sensor, supporting spring and specimen. The capacitance signal is sensed and controlled by a second sigma-delta modulator circuit. The analytic macromodel of polysilicon thin film specimen considering geometric nonlinearity and the numerical reduced-order model of V-beam electrothermal actuator based on Krylov subspace projection are created separately and described in the MAST hardware language. The mechanical structure dimension size and circuit components parameters are determined and optimized according to system-level simulation. The computing result has shown that the self-build macromodels and the on-chip integrated test system are efficient and reliable. © (2011) Trans Tech Publications.


Wang L.-P.,Dalian University of Technology | Zhou Y.,Dalian University of Technology | Qiu J.-S.,Dalian University of Technology | Qiu J.-S.,Key Laboratory for Micro Nano Technology and System of Liaoning Province
Xinxing Tan Cailiao/New Carbon Materials | Year: 2011

Asphaltene-based ordered mesoporous carbon (OMC) was oxidized with 5 mol/L nitric acid at 40-100°C. The influence of nitric acid oxidation treatment on its textural properties and electrochemical performance as a supercapacitor electrode material was investigated and the ionic transport behavior in relation to surface chemical structure was discussed. The pore structures and electrochemical performance were examined using XRD, nitrogen adsorption and an electrochemical workstation. Results indicate that electrochemical performance can be improved with nitric acid treatment under mild conditions. The regular mesostructure can be retained, and the surface areas and pore volumes vary slightly when oxidation temperature is below 60°C. A capacitor assembled with the OMC sample oxidized at 60°C exhibits excellent electric double layer behavior, improved frequency response characteristics and a fast charge-discharge rate with a time constant of 6 s. The gravimetric specific capacitance and energy density of OMC oxidized at 60°C are 138 F·g-1 and 3.9 Wh·kg-1 respectively at a scanning rate of 5 mV·s-1. These values are respectively 57% and 63% greater than for the un-treated one.


Xiao N.,Dalian University of Technology | Ling Z.,Dalian University of Technology | Wang L.-P.,Dalian University of Technology | Zhou Y.,Dalian University of Technology | And 2 more authors.
Xinxing Tan Cailiao/New Carbon Materials | Year: 2010

T-type zeolite/carbon foam composites with a hierarchical structure were prepared by carbonizing polyurethane foam impregnated with a mixture of polyamic acid and T-type zeolite. The carbonization was conducted at 900°C in flowing nitrogen. The as-prepared composites were examined using SEM, XRD and N2 adsorption techniques. It has been found that the foam-like monolith consists of open cells with an average size of ca. 500μm, and T-type zeolites are anchored on the cell walls of the foam with their structure remaining unchanged even after heat treatment at 900°C. The zeolite/CF composites with a BET surface area of 328 m2/g are microporous, and have a narrow pore size distribution centered at 0.45 nm.


Chu J.,Dalian University of Technology | Chu J.,Key Laboratory for Micro Nano Technology and System of Liaoning Province | Zhang Y.,Dalian University of Technology | Zhang Y.,Key Laboratory for Micro Nano Technology and System of Liaoning Province | And 4 more authors.
Optics Communications | Year: 2014

A polarizing color filter based on subwavelength metallic grating with grooves carved in the wires is investigated using the finite-difference-time- domain (FDTD) method. Three different devices are designed based on the transmission characteristics under different geometrical parameters: the maximum transmittances are 69.7%, 74.8% and 65.3%, the extinction ratios at the transmission peak wavelength are 148, 70 and 41, and the full widths at half-maximum (FWHM) are 101 nm, 90 nm and 107 nm, respectively. The structure not only obtains a high transmittance, broad bandwidth and desirable extinction ratio, but also suppresses redundant spectral peaks and transmission sidebands. Therefore, it provides a new reference for the design of color filters. © 2013 Elsevier B.V.


Wang X.,Key Laboratory for Micro Nano Technology and System of Liaoning Province | Song H.,Dalian University of Technology | Liu C.,Key Laboratory for Micro Nano Technology and System of Liaoning Province | Luo Y.,Key Laboratory for Micro Nano Technology and System of Liaoning Province
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | Year: 2011

The dimensions of miniature parts differ greatly, resulting in low efficiency during manual assembly and poor consistency of the assembled products. A limited visual field of the camera for high-precision measurements and a large work space cause problems in the application of machine vision. Moreover, the diversity of the parts' finished surface and the deviations of dimensions are some of the uncertain factors that affect the assembly process. A system based on machine vision and a manual intervention method was developed. It used a vision apparatus and precise displacement platforms to realize measurement. An assembly control strategy based on task messages was used to fulfill the three frameworks of software (the behavior layer, task layer, and strategy layer). Finally automatic measurement and precise assembly of miniature parts were realized. The composition of the assembly system, the recognition and positioning of the parts, the realization of the micro-assembly procedure, and the test results of practical assembly were introduced. The results show that the measurement system, the control strategy, and software structure have very good feasibility for measurement and assembly of miniature-parts.


Qu J.,Dalian University of Technology | Qu J.,Liaoning Normal University | Zhao Z.,Dalian University of Technology | Wang X.,Dalian University of Technology | And 4 more authors.
Materials Express | Year: 2012

Silicon oxide (SiOx) nanowire assemblies have been synthesized using anhydrous ferric chloride (FeCl3) as a catalyst precursor and silicon wafers as both the silicon source and substrate by means of floating catalyst chemical vapor deposition (CVD) in order to produce different morphologies. It is found that the growth and morphology of SiOx is strongly temperature-dependent, as tested within the temperature range 1000-1200 °C. The sublimation of FeCl3 and its subsequent reduction in the gas phase to produce Fe nanoparticles with high catalytic activity allows for the efficient growth of SiOx nanowires via vapor-liquid-solid (VLS) mechanism. The prepared amorphous SiOx nanowires show photoluminescence and emit blue light. This floating catalyst method offers a simple and comprehensive approach for the large-scale production of SiOx nanostructures with tunable assemblies. © 2012 by American Scientific Publishers.


Zhifeng L.,Key Laboratory for Precision and Non Traditional Machining of Ministry of Education | Liding W.,Key Laboratory for Micro Nano Technology and System of Liaoning Province
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2010

In all accuracy indexes of gears, measurement of involute tooth profile's error is a difficult technical problem. A double-disc instrument for measuring involute is introduced, which can be used to measure reference involute. The main errors sources of the instrument are analyzed, and all measurement errors are simulated by Mont-Carlo method. After analyzing error sequence, the double disc instrument's measurement uncertainty is 0.45μm when measuring gear (m=4 z=30 α=20°), which is less than the value evaluated by GUM method, and more reliable and accurate. © 2010 SPIE.


Lou Z.,Key Laboratory for Precision and Non traditional Machining of Ministry of Education | Wang X.,Key Laboratory for Micro Nano Technology and System of Liaoning Province | You B.,Key Laboratory for Precision and Non traditional Machining of Ministry of Education | Xu Y.,Key Laboratory for Precision and Non traditional Machining of Ministry of Education
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

In the paper, a precision press-fit instrument for assembling small interference fitting parts is introduced, which includes pressing module and parts alignment module. The pressing module was used to clamp and position parts, and parts alignment module was used for the two parts' alignment. Through analyzing press-fit control method, component alignment and adjustment strategy, and machine vision device calibration method, the instrument meets the pressing requirements of precision small components. Finite element method is used to predict the reasonable range of press-fit force, and pressing result of the instrument is tested by experiments. © 2015 SPIE.

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