Advertisement Hide. Article First Online: 05 July This is a preview of subscription content, log in to check access. Abou-El-Sherbini, K. Applied Clay Science , , 33— CrossRef Google Scholar. Alba, M. Chemical Communications , 37— Google Scholar. Armstrong, B.
A novel nanokaolinite photocatalyst for degradation of P-nitrophenol - IEEE Conference Publication
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Gerstein, B. Ghose, S. American Mineralogist , 58 , — Giese, R. Gullion, T. Chemical Physics Letters , , — Hayashi, S. Journal of Physical Chemistry , 96 , — Solid State Nuclear Magnetic Resonance , 4 , — The main advantages of the method are: 1 analysis object not only contains the tolerance, but also contains the assembly clearance; 2 it can analyse the stack-up deviation of the multiple assembly clearance; 3 it can effectively perform the assembly functionality check and the evaluation of the tolerance allocation results.
At last, taking slider-crank mechanism as an example, the contrastive study of tolerance analysis for functionality check is done after establishing stack-up model of assembly tolerance analysis. The results show that it is prone to lead to misjudge when analysing only dimension tolerance, the analysis results of considering dimension tolerance, geometric tolerance and assembly clearance are more restrictively.
However, it is more compliance with actual engineering. Keywords : Tolerance analysis; Assembly tolerance; Tolerance stack-up model; Assembly clearance; Slider-crank Mechanism. In order to verify the suitability of MC at high temperature, the MC and shear relaxation moduli are used in the finite element FE simulation at the isothermal compression stage.
Similar von Mises stresses are shown and the usability of the MC at molding temperature is proved by the simulation results. Keywords : Glass molding press; Viscoelasticity; Thermal rheological simple; Master curve; Finite element. The sensing materials was amorphous carbon a-C film prepared using electron cyclotron resonance ECR plasma processing system under low energy electron irradiation sputtering. The nanostructure of a-C film was observed by transmission electron microscope TEM , the atomic bonding and carbon hybridization condition was analyzed by Raman spectra and X-ray photoelectron spectroscopy XPS respectively.
The linearity of temperature-resistance curve of this kind of a-C film was very good in certain temperature range, with high temperature coefficient of resistance TCR. The a-C film by 50 eV electron irradiation can measure larger temperature range from degree centigrade to degree centigrade, with good repeatability. The working temperature range of a-C film by eV electron irradiation was much smaller, but TCR absolute value of this film was higher.
The research shows that this kind of a-C film temperature sensor has good linearity and repeatability, also it can be integrated with other MEMS sensor simply. Keywords : Amorphous carbon film; Thermistor; Temperature sensor; Temperature resistance characterization; Temperature coefficient of resistance.
Zaved Hossain Khan, Partha P. Das, Md. The UV-vis absorption spectrum was indicated that the reduction and stabilization of ZnO nanoparticles in aqueous medium. The peaks in X-ray diffraction pattern were revealed that the formation of ZnO in nanoscale and it good treaty with that of crystalline hexagonal structure. It was observed that ZnO elicited in form of nanoparticles and nanoflowers in spherical shape as well as homogeneous dispersion.
The grain size were found to be nm. Thermo gravimetric analysis and Diffractive thermal analysis results were showed the thermal stability of ZnO nanoparticles in the temperature region of room temperature to C. FTIR measurement was revealed that the synthesized Zn ion have potential interaction towards organic aqueous fluid to form of ZnO nanoparticles.
Keywords : ZnO nanoparticles; ZnO nanoflowers; crystalline structure; morphology; thermal analysis. Sayed, Manal S. El- Masry, Wafaa S.
Hassan, Magda Y. The first method Method A is based on the reducing character of the cited drugs which causes chemical reduction of silver ions to silver nanoparticles Ag-NPs in the presence of polyvinyl pyrrolidone PVP as a stabilizing agent producing surface plasmon resonance which has absorption peaks at and nm for doxycycline hyclate and oxytetracycline HCl, respectively.
The plasmon absorbance of the Ag-NPs was used for the quantitative spectrophotometric determination of the cited drugs. The second method Method B is a conductometric method which is based on the reaction of the cited drugs with phosphotungstic acid to form ion associates in aqueous system. Validation of the proposed methods was carried out. Keywords : Silver nanoparticles; doxycycline hyclate; oxytetracycline HCl; conductometry and phosphotungstic acid. The simulation results show that the optimal excitation frequency is slightly higher than the eigenfrequency, and the maximum piezoelectric power of the PVEH can be obtained only when the appropriate excitation frequency and load resistance are selected, and the power generation efficiency is 0.
By comparing the unimorph and bimorph beams, it is suggested that the unimorph and bimorph MEMS-PVEHs should be designed to improve the piezoelectric output by decreasing resonant frequency and increasing input mechanical power. Finally, the piezoelectric unimorph with double opposite electrodes is designed based on the MEMS fabrication process. FTIR peaks assign to presence of nitrogen between nanokaolinite layers, which maybe lead to decrease the band gap of prepared samples.
The photocatalytic activity of nanokaolinite photocatalysts was investigated by degradation of PNP under ultra-violet irradiation. Keywords : Delamination; Kaolinite; phyllosilicates family; Intercalation; Photodegradation; P-nitrophenol; Paper filler; Photocatalytic activity. Thus, it is necessary to investigate processing technology of such aspheric parts. In this paper, an aspherical mirror is ground with cup wheel in five-axis CNC Computer Numerical Control machine tool and corresponding processes were investigated. To improve machining efficiency and reduce tool wear, the workpiece is firstly ground to be a spherical mirror, and then it is ground to be the aspheric contour.
The best fitting spherical mathematical equation is derived by the axisymmetric quadratic aspheric generatrix equation. The aspheric curve is processed into a paraboloid shape. The experimental results show that the surface profile of the aspherical lens is consistent with the designed profile, and the PV Peak Value value of the error is. Such results can be accepted in consideration of working allowance for polishing.
According to the experimental results, the cause of the error was analyzed and methods for improving precision were proposed. Keywords : five-axis machine tool; cup wheel; aspheric surface; fitting spherical radius. An extremely tiny vibration will directly influence the quality of the surface at the nanoscale. Therefore, in this study, a mathematical model of aerostatic spindle vibration under pulsed excitation was established by analyzing the characteristic cutting path of a fly cutter head and the state of the spindle under interrupted cutting force, and then, the axial and radial of the aerostatic spindle to pulses during periodically interrupted fly cutting were calculated using a Fourier series.
Under the periodic processing mode of high-speed fly cutting, a simulation and experimental analysis on the spindle vibration were conducted. The experimental results show that the cutting force and spindle speed are major factors influencing surface roughness. According to the simulation and experimental analysis, reliable theoretical guidance is provided for the improvement and prediction of surface quality of an ultra-precision fly cutting.ivenoutveho.ml
Spectroscopic Investigations of Delaminated and Intercalated Phyllosilicates Fri
Keywords : aerostatic spindle; fly cutting; dynamic response; vibration; surface roughness. And the modern manufacturing industry has put forward higher requirements for the coaxiality measurement with the development of the industrial technology. The existing coaxiality detection methods are mostly based on manual measurements.
It takes long time to adjust the axes of assembly parts and turntable to coincide by the current measurement method, which greatly affects production efficiency. To solve the problem, this paper proposes a coaxiality detection method which can compensate assembly installation errors automatically.
The coaxiality measurement method based on the position of the assembly is deduced by introducing the measurement mechanism of the coordinate measuring machine. The data processing uses coordinate transformation and least squares fitting method. Experimental verification shows that the method do not need to adjust the assembly part repeatedly, so measuring time is reduced greatly.
The method simplifies the measurement steps, and provide supports of methods and techniques for automatic detect. The entire measuring device was placed in a temperature controllable environment to measure the position change of the screw connection structure while temperature load is applied. The centroid position change of screw connection structure was calculated from the measured data.
Uncertainty of the measurement method was analyzed which is about 0. And a measurement experiment was carried out on the design structural. Finally, simulation of the measured structure was carried out to confirmed that the measurement method proposed in this paper is effective. Keywords : submicron; measurement method; screw connected structures; temperature load; screw pre-tightening force.
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