Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: April 2011
Authors: Qi Shu, Bing Gang Wang
Discrete statistical analysis of the random measurement data about oil field workers was performed according to the probability distribution theory.
Different from SolidWorks, CATIA has special ergonomics analysis module and provides the human body data of American, Canadan, Korean and French, except for Chinese.
One is modification of the detailed Korean data which are similar to Chinese [5], the other is to create a file containing information about the target population directely.
The detailed procedure is defining a complete human body model data, adding it into the CATIA body model lib and setting the parent products, model name, sex and human body percentiles [6].
The optimized data were illustrated in table 1.
Different from SolidWorks, CATIA has special ergonomics analysis module and provides the human body data of American, Canadan, Korean and French, except for Chinese.
One is modification of the detailed Korean data which are similar to Chinese [5], the other is to create a file containing information about the target population directely.
The detailed procedure is defining a complete human body model data, adding it into the CATIA body model lib and setting the parent products, model name, sex and human body percentiles [6].
The optimized data were illustrated in table 1.
Online since: December 2012
Authors: Dong Sheng Yang
Optical fiber gyro can not only accurately determine angular rate, but also through the integral angular rate data provide direction.
Software Design According to the requirement of engineering system design, no matter any design a system, to the whole system, first according to function, time and the direction of the data communication relationship divided into several subsystems, between each subsystem clarity of time has the relationship or simultaneously, the stability of the data communication way.
According to such requirements, and combined with the design of the hardware part will be fully digital closed loop fiber-optic gyroscope system is divided into: initialization system, the happening of the modulated signal, signal collection, digital signal from the FIFO read DSP, DSP data treatment, the output signal to the next and feedback cycles.
Each part of the timing relationships and data communication direction as shown in figure 2.
Figure 2 Parts timing relationships, data flow direction Conclusions The light path part and circuit of the composition, the light path in part by the broadband light source, optical couplers, multi-function integrated optical chips and optical fiber coil form, by amplifier circuit of the filter circuits, A/D conversion, logic circuit, D/A converter, etc.
Software Design According to the requirement of engineering system design, no matter any design a system, to the whole system, first according to function, time and the direction of the data communication relationship divided into several subsystems, between each subsystem clarity of time has the relationship or simultaneously, the stability of the data communication way.
According to such requirements, and combined with the design of the hardware part will be fully digital closed loop fiber-optic gyroscope system is divided into: initialization system, the happening of the modulated signal, signal collection, digital signal from the FIFO read DSP, DSP data treatment, the output signal to the next and feedback cycles.
Each part of the timing relationships and data communication direction as shown in figure 2.
Figure 2 Parts timing relationships, data flow direction Conclusions The light path part and circuit of the composition, the light path in part by the broadband light source, optical couplers, multi-function integrated optical chips and optical fiber coil form, by amplifier circuit of the filter circuits, A/D conversion, logic circuit, D/A converter, etc.
Online since: October 2012
Authors: Hui Fang, Wei Tang, Yan Jing Meng
The driving is controlled by speed and the datum speed comes from the standard of running speed.
The update mode of closed loop speed can be used in the conditions of usually changing papers, having the more large width of rollers and getting precise inertia data.
PLC according to running speed and real diameter calculates the driving benchmark of rev datum.
Algorithm of rev datum in the procedure: in which Rd: Rev datum; : Practical linear velocity; : Practical diameter; : Minimum diameter of roll; : Reduction ratio of gear case; AI: Analog input Calculation of diameter of roll.
The calculation of diameter of roll bases on linear velocity datum and that assuming the practical linear velocity and linear velocity datum is the same.
The update mode of closed loop speed can be used in the conditions of usually changing papers, having the more large width of rollers and getting precise inertia data.
PLC according to running speed and real diameter calculates the driving benchmark of rev datum.
Algorithm of rev datum in the procedure: in which Rd: Rev datum; : Practical linear velocity; : Practical diameter; : Minimum diameter of roll; : Reduction ratio of gear case; AI: Analog input Calculation of diameter of roll.
The calculation of diameter of roll bases on linear velocity datum and that assuming the practical linear velocity and linear velocity datum is the same.
Online since: May 2011
Authors: Jie Ting Tao, Xue Min Xu, Cheng Jun Wei, Xin Jing Meng, Hong Hua Ge
Sodium hypochlorite is a kind of oxidizing biocide, and Cl- is the final product of its reduction process.
Figure 1 The polarization curves of stainless steel electrode containing sodium hypochlorite of different concentrations (Data in this figure correspond to the concentration of sodium hypochlorite) Figure 2 The polarization curves of stainless steel in raw water containing 20mg/L sodium hypochlorite (Data in this figure correspond to the deposited time (day)) Effect of dodecyl dimethyl benzyl ammonium bromide on the anti-corrosion performance of stainless steel Dodecyl dimethyl benzyl ammonium bromide is one kind of the biocide of quaternary ammonium salt.
Figure 3 The polarization curves of stainless steel in the raw water containing dodecyl dimethyl benzyl ammonium bromide of different concentrations (Data in this figure correspond to the concentrations of dodecyl dimethyl benzyl ammonium bromide (mg/L)) Figure 4 The polarization curves of stainless steel in raw water containing 100mg/L dodecyl dimethyl benzyl ammonium bromide (Data in this figure correspond to the deposited time (day)) Effect of isothiazolinone on the anti-corrosion performance of stainless steel Isothiazolinone is a kind of non-oxidizing biocide.
Figure 5 The polarization curves of stainless steel in raw water containing isothialinone of different concentrations (Data in this figure correspond to the concentrations of isothialinone (mg/L)) Figure 6 The polarization curves of stainless steel in raw water containing isothialinone of 10mg/L (Data in this figure correspond to the deposited time (day) after adding agent to the raw water under the normal temperature) Conclusions Biocides such as sodium hypochlorite and dodecyl dimethyl benzyl ammonium bromide containing halogen can prompt the pitting corrosion of 304 stainless steel.
Figure 1 The polarization curves of stainless steel electrode containing sodium hypochlorite of different concentrations (Data in this figure correspond to the concentration of sodium hypochlorite) Figure 2 The polarization curves of stainless steel in raw water containing 20mg/L sodium hypochlorite (Data in this figure correspond to the deposited time (day)) Effect of dodecyl dimethyl benzyl ammonium bromide on the anti-corrosion performance of stainless steel Dodecyl dimethyl benzyl ammonium bromide is one kind of the biocide of quaternary ammonium salt.
Figure 3 The polarization curves of stainless steel in the raw water containing dodecyl dimethyl benzyl ammonium bromide of different concentrations (Data in this figure correspond to the concentrations of dodecyl dimethyl benzyl ammonium bromide (mg/L)) Figure 4 The polarization curves of stainless steel in raw water containing 100mg/L dodecyl dimethyl benzyl ammonium bromide (Data in this figure correspond to the deposited time (day)) Effect of isothiazolinone on the anti-corrosion performance of stainless steel Isothiazolinone is a kind of non-oxidizing biocide.
Figure 5 The polarization curves of stainless steel in raw water containing isothialinone of different concentrations (Data in this figure correspond to the concentrations of isothialinone (mg/L)) Figure 6 The polarization curves of stainless steel in raw water containing isothialinone of 10mg/L (Data in this figure correspond to the deposited time (day) after adding agent to the raw water under the normal temperature) Conclusions Biocides such as sodium hypochlorite and dodecyl dimethyl benzyl ammonium bromide containing halogen can prompt the pitting corrosion of 304 stainless steel.
Online since: November 2012
Authors: Wen Ni, Xu Fang Zhang, Jing Wang
The data in this paper were laboratory data, laboratory data were different with engineering practice, so we can not take the laboratory data directly to do with the strength of the GB standards.
According to literature, the strength of the laboratory should be discounted, and reduction factor of about 0.5 [7].
So the laboratory strength data were twice more compared to the standard.
The application of stabilizer aimed for the consolidation of the road subgrade, and the 7 d compressive strength of cementitious materials up to 3~4 MPa according to soil stabilizer (CJ/T3073-1998), so the strength data of laboratory should in 6~ 8Mpa.
According to literature, the strength of the laboratory should be discounted, and reduction factor of about 0.5 [7].
So the laboratory strength data were twice more compared to the standard.
The application of stabilizer aimed for the consolidation of the road subgrade, and the 7 d compressive strength of cementitious materials up to 3~4 MPa according to soil stabilizer (CJ/T3073-1998), so the strength data of laboratory should in 6~ 8Mpa.
Online since: September 2014
Authors: Zhi Gang Jia, Xing Xuan Wang
In literature [1] the step response identification method needs integral computation of measurement data and is only for step response.
There are two problems in algorithm previously mentioned: First, it is a heavy job to calculate all the measurement data.
There is an interesting phenomenon, i.e. not the more noise reduction the better.
Parameter identification by square signal is more effective than step signal in some case according to the data of the second row in table 4 and data in table 2.
A Continuous-Time Linear System Identification Method for Slowly Sampled Data.
There are two problems in algorithm previously mentioned: First, it is a heavy job to calculate all the measurement data.
There is an interesting phenomenon, i.e. not the more noise reduction the better.
Parameter identification by square signal is more effective than step signal in some case according to the data of the second row in table 4 and data in table 2.
A Continuous-Time Linear System Identification Method for Slowly Sampled Data.
Online since: May 2011
Authors: Cui Jin Li, Guo Qiang Yin, Qing Bing Guo, Hong Mei Hang, Xin Hua Zhou, Sheng Gong
The diffraction data for title complex were collected at 293 K on a Bruker Smart CCD diffractometer with Mo-Ka radiation (l=0.071073 nm), and the data reduction was performed using Bruker SAINT.[14] The structure was solved using a direct method, which yielded the positions of all or most of the non-hydrogen atoms.
All calculations were performed using the SHELXTL programs.[15] The crystallographic data are summarized in Table 1.
CCDC-798273 Table 1 Crystallographic data and structure refinement for title complex.
Empirical formula C90H66I6N24O2Zn3 α [º] 103.364(2) Formula weight 2473.2 β [º] 91.508(2) Temperature [K] 293(2) γ [º] 101.476(2) Crystal system triclinic V [nm3] 4.5412(8) Space group P-1 Dc [g·cm-3] 1.809 a [nm] 0.99234(10) m [cm1] 2.888 b [nm] 2.1284(2) S on F2 0.997 c [nm] 2.2615(2) Z 2 R1a, wR2b [I>2σ (I)] 0.0788, 0.1861 R1a, wR2b [all data] 0.1543, 0.2268 R1a = å||Fo|-|Fc||/å|Fo|, wR2b = [åw(Fo2-Fc2)2/åw(Fo2)2]1/2.
All calculations were performed using the SHELXTL programs.[15] The crystallographic data are summarized in Table 1.
CCDC-798273 Table 1 Crystallographic data and structure refinement for title complex.
Empirical formula C90H66I6N24O2Zn3 α [º] 103.364(2) Formula weight 2473.2 β [º] 91.508(2) Temperature [K] 293(2) γ [º] 101.476(2) Crystal system triclinic V [nm3] 4.5412(8) Space group P-1 Dc [g·cm-3] 1.809 a [nm] 0.99234(10) m [cm1] 2.888 b [nm] 2.1284(2) S on F2 0.997 c [nm] 2.2615(2) Z 2 R1a, wR2b [I>2σ (I)] 0.0788, 0.1861 R1a, wR2b [all data] 0.1543, 0.2268 R1a = å||Fo|-|Fc||/å|Fo|, wR2b = [åw(Fo2-Fc2)2/åw(Fo2)2]1/2.
Online since: July 2013
Authors: Zhi Yue Liu, Ru Yan Xu, Li Qiong Wang
Those data are of great importance for large scale numerical simulation of the explosion effects from pyrotechnic mixtures.
With those known data, the new set of mole numbers xi can be found from Eqs. 25 26.
Their molar standard thermochemical data are obtained from JANAF databank [8].
From these data as initial state, the explosion effects can be estimated via hydrodynamic code to for the calculation of shock wave propagation.
[8] Data from http://kinetics.nist.gov/janaf.
With those known data, the new set of mole numbers xi can be found from Eqs. 25 26.
Their molar standard thermochemical data are obtained from JANAF databank [8].
From these data as initial state, the explosion effects can be estimated via hydrodynamic code to for the calculation of shock wave propagation.
[8] Data from http://kinetics.nist.gov/janaf.
Online since: June 2008
Authors: Ralf D. Geckeler
Combining theoretical
considerations, including extensive ray tracing, and experimental data, a new pentaprism adjustment
procedure was developed [6].
The resulting calibration data are used to correct a given angle reading of the autocollimator to achieve an accurate and traceable angle measurement by means of the device.
The measurements were performed by applying an optimized shear combination of 4 & 35 data points (=140 data points per scan, physical shears of 2.3 mm & 20.0 mm for the scan length of 80 mm).
The measurement uncertainty (calculated in accordance with [12]) for the ESAD topography scans is a function of the position of the data point in the scan.
Summary The following points summarize the basic features of ESAD shearing deflectometry in general and the measuring capabilities of the ESAD device at PTB: • Absolute measurement method (basis: straight propagation of light) • Standard measurement uncertainty of topography < 1 nm up to 500 mm scan length • Optimized measurand (angle and length) traceability to SI units • Near-constant measuring conditions independent of surface dimensions • No basic limitation of the dimensions of the surface under test to be measured • Optimized adjustment (automated and in situ) of pentaprism and surface under test • Reduction of influences of prism guiding errors on deflection angle (by factor 1:10000) • Elimination of any whole-body tilting of the surface (due to shifting of the specimen) Acknowledgement The author would like to thank Dipl.
The resulting calibration data are used to correct a given angle reading of the autocollimator to achieve an accurate and traceable angle measurement by means of the device.
The measurements were performed by applying an optimized shear combination of 4 & 35 data points (=140 data points per scan, physical shears of 2.3 mm & 20.0 mm for the scan length of 80 mm).
The measurement uncertainty (calculated in accordance with [12]) for the ESAD topography scans is a function of the position of the data point in the scan.
Summary The following points summarize the basic features of ESAD shearing deflectometry in general and the measuring capabilities of the ESAD device at PTB: • Absolute measurement method (basis: straight propagation of light) • Standard measurement uncertainty of topography < 1 nm up to 500 mm scan length • Optimized measurand (angle and length) traceability to SI units • Near-constant measuring conditions independent of surface dimensions • No basic limitation of the dimensions of the surface under test to be measured • Optimized adjustment (automated and in situ) of pentaprism and surface under test • Reduction of influences of prism guiding errors on deflection angle (by factor 1:10000) • Elimination of any whole-body tilting of the surface (due to shifting of the specimen) Acknowledgement The author would like to thank Dipl.
Online since: March 2012
Authors: Li Ping Wang, Lian Qing Yu, Jian Han, Hai Tong Wang
Modern neural networks are non-linear statistical data modeling tools.
They are usually used to model complex relationships between inputs and outputs or to find patterns in data.
Clustering analysis is a technique to generate groups of subsets of data called clusters within which the distance between subsets is small, whereas a distance between clusters is greater in that two subsets from different clusters are distant.
The measurement data of the T1, T7, T25, T32 are used to train the prediction model, the output of the model is the Y axis thermal error and Z axis thermal error.
Reduction and Compensation of Thermal Errors in Machine Tools.
They are usually used to model complex relationships between inputs and outputs or to find patterns in data.
Clustering analysis is a technique to generate groups of subsets of data called clusters within which the distance between subsets is small, whereas a distance between clusters is greater in that two subsets from different clusters are distant.
The measurement data of the T1, T7, T25, T32 are used to train the prediction model, the output of the model is the Y axis thermal error and Z axis thermal error.
Reduction and Compensation of Thermal Errors in Machine Tools.