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2015 Vol. 36, No. 6 Published: 2015-11-22

	561	Angle Vibration Calibration Technology Research by Diffraction Grating Heterodyne Laser Interferometry
		YU Mei,LIU Ai-dong,HE Wen,YANG Li-feng,ZUO Ai-bin,HU Hong-bo
		DOI: 10.3969/j.issn.1000-1158.2015.06.01
		As in all areas of rotational angular vibration (angular acceleration and angular velocity and angular displacement) measurement increase in demand, research and the establishment of the angular acceleration national primary standard device to solve all kinds of rotation angle vibration sensors and measuring instruments quantity traceability problem is imminent. Based on the analysis of domestic and foreign research present situation, the steady state sine angle vibration excitation system, laser interference measurement system and the data processing technology of angular acceleration absolute calibration method was discussed; And the technical difficulties in development of the high precision rotation angle vibration excitation system and sine-phase diffraction grating disc are proposed.
		2015 Vol. 36 (6): 561-564 [Abstract] ( 944 ) HTML (1 KB) PDF (362 KB) ( 933 )

	565	The Build of Two-dimensional Nano-displacement Measure System and Experiment Research
		ZHAO Xian-yun,GAO Si-tian,LI Qi,LU Rong-sheng，
		DOI: 10.3969/j.issn.1000-1158.2015.06.02
		A two-dimensional nanometer displacements using piezoelectric ceramic (PZT) to drive overlay of flexure hinge mechanism is developed. The structure of displacement system is introduced and the job of displacement stiffness is analyzed. The theoretical and simulation result error is below 6.3%. A laser interferometer based on the principles of linear interferometer measurement system is constructed, and the layout and displacement measurement principle of the measurement system is described.Then the nanometer displacement itinerary and location accuracy is measured. The results show that within the trips of 100 μm, the x axis and y axis of tests displacement is 99.6 μm and 97.7 μm. The sources of error of the test system is analyzed and the uncertainty of the measurement system is assesed, and the combined standard uncertainty of measurement system of the x axis and the y axis is 10.04 nm and 13.93 nm.
		2015 Vol. 36 (6): 565-569 [Abstract] ( 843 ) HTML (1 KB) PDF (3073 KB) ( 1101 )

	570	Research on Abbe Error Elimination Method for Large length Laser measurement
		MIAO Dong-jing,LI Jian-shuang,LI lian-fu,HE Ming-zhao,DENG Xiang-rui, JIANG Yuan-lin,KANG Yao,ZHANG Jing-yan
		DOI: 10.3969/j.issn.1000-1158.2015.06.03
		To eliminate the Abbe error in large length laser measurement, an algorithm which based on three independent laser interferometers is proposed. The mounting positions of three interferometers can be arranged in any triangle. By using the length data measured from the three interferometers, and with the geometric relationship between the mounting positions of the instrument to be calibrated and the three interferometers, a virtual interferometer which has a common path with the calibrated instrument is constructed, then the length measuring formula is derived. This method has no special requirement respect to the mounting positions of the three interferometers, so it is very easy to implement in practice. To verify the effectiveness of the algorithm, relying on the indoor 80 meters large length standard measurement device, by changing the mounting position of the calibrated instrument, 3 different experiments are carried out within 45 m measurement range. As the experiment indicates that after eliminating the Abbe error, the maximum of the other remaining error is only 1.10 μm, the result show that the proposed algorithm can eliminate the Abbe error effectively.
		2015 Vol. 36 (6): 570-574 [Abstract] ( 1085 ) HTML (1 KB) PDF (2525 KB) ( 1549 )

	575	The Research of Micro-Nano Linewidth Measurement Technology on Metrological Ultraviolet Microscope
		YIN Chuan-xiang,GAO Si-tian,ZHAO Xian-yun,LI Qi, SHI Yu-shu,LI Wei,LU Rong-sheng
		DOI: 10.3969/j.issn.1000-1158.2015.06.04
		The micro-nano linewidth measurement technology on metrological ultraviolet microscope is that photovoltaic effect of photomultiplier tubes is used to convert the optical signal to electric signal and extract the outline of linewidth by the subsequent signal acquisition circuit. Using some precision positioning device,such as laser interferometer, a linewidth measurement system is builded to measure a standard sample which the linewidth is 3 μm. The linewidth measurement result is 3.025 μm, differ with nominal value 25 μm. Experiment shows that the method can accurately obtain the border of the linewidth , it can achieve accurate measurement of linewidth.
		2015 Vol. 36 (6): 575-578 [Abstract] ( 617 ) HTML (1 KB) PDF (1881 KB) ( 792 )

	579	Task-oriented Measurement Uncertainty Evaluation of Coordinate Measuring Machine
		CHEN Xiao-huai,LI Hong-li,YANG Qiao,WANG Han-bin,CHENG Yin-bao
		DOI: 10.3969/j.issn.1000-1158.2015.06.05
		Based on geometrical product specification (GPS) and verification, the main sources of task-oriented measurement uncertainty of coordinate measuring machine (CMM) are analyzed. The definition and characteristics of reproducibility, which is one of CMM quantum property factors, are specially discussed. For the measurement task of CMM, the main factors that might cause measurement reproducibility are proposed, the experimental procedure to evaluate reproducibility value is studied, and the mathematical model for reproducibility evaluation is established. Furthermore, the approach to evaluate task-oriented measurement uncertainty of CMM is provided through an example of circle diameter measurement. The results of the example analysis show that the uncertainty component caused by reproducibility is up to 2.5μm when the combined standard uncertainty of circle diameter measurement is determined to be 3.2μm, and it is accounted for the highest proportion of the result uncertainty.
		2015 Vol. 36 (6): 579-583 [Abstract] ( 599 ) HTML (1 KB) PDF (841 KB) ( 956 )

	584	Calculation of Elliptic Sphere Profile Error Using the Combination of the Differential Geometry Algorithm and the Particle Swarm Optimization Algorithm
		ZHANG Lei,ZHANG Zuo-ying,ZHANG Zhi-sheng
		DOI: 10.3969/j.issn.1000-1158.2015.06.06
		To address the issue of profile error calculation for an elliptic sphere, a mathematical model that transfers the discussion from a minimal distance calculation to a sphere center coordinates searching of an ideal ellipsoid was proposed based on the differential geometry algorithm (DGA) and the minimum zone principle. The proposed model was answered by the particle swarm optimization (PSO) algorithm. A numerical example demonstrated the effectiveness of the proposed method without counting the instrument’s measurement error.
		2015 Vol. 36 (6): 584-587 [Abstract] ( 599 ) HTML (1 KB) PDF (765 KB) ( 699 )

	588	Experiment Study on Measuring Refractive Index of Bulk Material
		WU Xu-hua,MIAO Yang
		DOI: 10.3969/j.issn.1000-1158.2015.06.07
		As an important optical constants of optical properties for transparent materials,the refractive index measurement of transparent plate such as glass plate is studied using Michelson interferometer, respectively, with He-Ne laser and white light as light source. Through optical path difference analysis, according to the change law of interference stripe shape and color, the experimental results are analyzed.The test results show that the method improves the disadvantages of slide instant fringe mobile number is not easy accurate counting and measuring refraction rate when the traditional interference method is used.
		2015 Vol. 36 (6): 588-591 [Abstract] ( 593 ) HTML (1 KB) PDF (722 KB) ( 1021 )

	592	Study and Establishment of Standard Measurement Facility of Effective Luminous Intensity of Flashing Light Source
		LIU Yu-long,LIU Wen-de,CHEN Chi,FAN Qi-ming
		DOI: 10.3969/j.issn.1000-1158.2015.06.08
		The standard measurement facility of effective luminous intensity traceable to the national illuminance working standard was established. The facility consists of the flashing light source, neutral filter, photometric detector, waveform sampling and processing unit. The facility can be used to calibrate related measuring instrument, paving the way for solving the problem of dissemination and traceability of the effective luminous intensity of flashing light source. Tested examples of Xe and LED flashing lights are analyzed. The rising edge of the LED flashing light is steep, with good stability, which can be further optimized to be used as standard light of effective luminous intensity. The factors influencing the experiment were analyzed, and an uncertainty level of 2.4% (k=2) is obtained for the measurement facility.
		2015 Vol. 36 (6): 592-594 [Abstract] ( 698 ) HTML (1 KB) PDF (299 KB) ( 594 )

	595	Mechanism of the Strip Surface Chatter Marks of the 1220 Cold Rolling Mill
		XIE Chang-gui,ZENG Hai
		DOI: 10.3969/j.issn.1000-1158.2015.06.09
		Aiming at a 1220 strip surface, where the cold rolling mill had chatter marks, on which the reasons for the formation was tracked tested for in-depth study.Based on the vibration test, the analysis was given to the dynamic characteristics of the rack and the various phases of work rolls in the cycle on vibration signal.It was found that in its middle or late phase of the backup roll being used, the mill mainly worked with the 7th-order natural vibration at app.600Hz. When the rolling speed was maintained in the stable middle-/high-speed rolling phase, the relative movement of the work roll to the intermediate roll caused the formation of the chatter marks in the work roll surface.This had reaction to the mill that caused the forced vibration mill to further accelerate the formation of chatter marks, where mill vibration came along with both the resonance and forced vibration.In the analysis of the mechanism on the chatter marks, the relationship between chatter marks spacing and vibration source was considered in successfully finding out the cause of the 1220 mill chatter marks generated, and then the chatter marks suppression measures were proposed with satisfied effects.
		2015 Vol. 36 (6): 595-598 [Abstract] ( 924 ) HTML (1 KB) PDF (1757 KB) ( 1125 )

	599	Study on Speed Compensation of Weigh-in-motion
		XU Zhi-ling,SHEN Pei-pei,LI Zhi-fei
		DOI: 10.3969/j.issn.1000-1158.2015.06.10
		To reduce the error value of weigh-in-motion caused by speeds, the physical model of vehicle is built, with analyzing the speeds on weighing accuracy, deducing their relationship and a compensative method of speeds. Then a weigh-in-motion dynamic model is built and simulated based on dynamic analysis of mechanical system. The result shows that the compensation effect is better and the accuracy of weigh-in-motion is improved, especially at the 8.33m/s, the maximum compensation amount reached 10% when the car weighed 20t.
		2015 Vol. 36 (6): 599-602 [Abstract] ( 737 ) HTML (1 KB) PDF (461 KB) ( 808 )

	603	Calibration Device and Methods for Calibrating Turning Dynamometer on Lathe
		WANG Yu-fei, REN Feng-zhang,ZHANG Dan-wen,WU Rui,HUANG Sheng-cao
		DOI: 10.3969/j.issn.1000-1158.2015.06.11
		The resistance strain type turning dynamometer is calibrated on ordinary lathe directly, which used by a set of self-made calibration device. Weights loading methods is adopted in the device in X, Y, Z three directions. The standard weights is used as a reference, the structure of the lathe, such as chuck, tailstock, etc. is utilized as support, the loading force direction can be fixed ensuredly, the precise force of three mutually perpendicular direction can be realized.
		2015 Vol. 36 (6): 603-606 [Abstract] ( 518 ) HTML (1 KB) PDF (397 KB) ( 837 )

	607	Study on Volume Measurement Method for Spherical Tank Based on Three Dimension Laser Scanning Principle
		WEI Kai,SONG Shu-gu,LIU Zi-yong
		DOI: 10.3969/j.issn.1000-1158.2015.06.12
		The method of sample and analysis for three dimension data cloud was discussed, and the main content included data sample principle, noise reduction, gross error identification, radius fitting and volume calculation. One preliminary experiment was done to test this method. The experimental result of one 1000m3 sphere tank showed that there was consistency between total station method and data cloud analysis method for the measurement on the level diameter of spherical tank with one difference 1mm, but for vertical diameter one big difference 16.1mm occurred between the data from two methods. The measurement uncertainty of laser scanning method used for tested the sphere tank volume calibration is 0.4% (k=2)。
		2015 Vol. 36 (6): 607-609 [Abstract] ( 688 ) HTML (1 KB) PDF (466 KB) ( 647 )

	610	The investigation on the evaluation for the turbine meter by the use of non-fixed point as master meter
		LI Chun-hui,LI Peng
		DOI: 10.3969/j.issn.1000-1158.2015.06.13
		The two evaluation methods for the turbine meter by the use of non-fixed point as master meter, linear interpolated method and curve fitting method were presented in detail. On the base of calibration results of 10 pieces of turbine meters, the uncertainties for each method were calculated. The results showed that, the prediction of the curve fitting agreed very well with the calibration result, and the uncertainty was obviously smaller than that of the linear interpolated method.
		2015 Vol. 36 (6): 610-612 [Abstract] ( 692 ) HTML (1 KB) PDF (310 KB) ( 658 )

	613	Study on Calibration Method of Gas-Volume Correction Devices
		ZHANG Tao
		DOI: 10.3969/j.issn.1000-1158.2015.06.14
		Calibration method for the error of the total flow at standard condition(20℃,101.325kPa) of the gas-volume conversion device is studied. According to the structural characteristics of different gas-volume conversion device, the experimental results of the prototype are completed by using the integrated or split type standard device. Respectively by comparison and division method of calculation and comparison of four kinds of data results, evaluation using different standard device adopts different methods of uncertainty, compare their characteristics and applicability of the obtained calibration gas-volume conversion device method is reasonable.
		2015 Vol. 36 (6): 613-616 [Abstract] ( 804 ) HTML (1 KB) PDF (305 KB) ( 848 )

	617	Pipe Leak Detection and Location Method Based on Dual Tree Complex Wavelet Transform and Recurrence Plot
		WANG Hui-xin,WANG Yu-tian, HUANG Man-yi,WANG Xiao-jing, ZHANG Shu-qing,CHEN Ying,WANG Shi-hao
		DOI: 10.3969/j.issn.1000-1158.2015.06.15
		A method of pipeline leak detection and location which is combined dual-tree complex wavelet transform (DT CWT) and recurrence plot (RP) average gray was introduced. DT CWT could overcome the shortcomings of traditional discrete wavelet transform and extract the signal feature completely. The RP average gray method could give the clear boundary of adjacent areas near the diagonal for prophase, interim and later stage of leak and locate leaks more accurately comparing with traditional wavelet modulus maxima method.The pressure signals of monitoring points were transformed by the dual-tree complex wavelet to extract characteristics of the signal. Then, according to analyzing characteristics of the signal by RP, the demarcation point that changed significantly of the area was determined as the leakage characteristic time. Finally, the leakage location was determined based on the principle of negative pressure wave. Simulation results showed the effectiveness and the superiority of this method.
		2015 Vol. 36 (6): 617-621 [Abstract] ( 564 ) HTML (1 KB) PDF (8901 KB) ( 378 )

	622	New Detection Method Based on Local Mean Decomposition for Voltage Sags
		HU Biao,WANG Xiao-guang,WU Su-min,WU Li-na
		DOI: 10.3969/j.issn.1000-1158.2015.06.16
		A new approach for voltage sag detection and analysis using local mean decomposition (LMD) is proposed. The method uses instantaneous amplitude and instantaneous frequency obtained by the decomposition to detect the drop value, frequency and the starting and ending time of the voltage sag. A new method of waveform extension which names horizontal and vertical proportion extension method is proposed to improve the end effect of LMD. Firstly, the lifting wavelet is applied to denoise original signals and horizontal and vertical proportion extension is performed on the denoised signals. Then the extended signals are decomposed by LMD. Further, the product function given by the decomposition is intercepted according to the corresponding time of the original signals. Finally, the feature information of voltage sag is extracted form instantaneous amplitude and instantaneous frequency obtained by LMD. The test results are compared with the results of Hilbert-Huang transform (HHT),and the simulation results illustrate that the proposed method is feasible and effective, which can provide a basis for the further identification of different voltage sag sources.
		2015 Vol. 36 (6): 622-627 [Abstract] ( 519 ) HTML (1 KB) PDF (4665 KB) ( 626 )

	628	Study on Weak Signal Detection Based on Variable Scale Multi-stable Stochastic Resonance
		SHI Pei-ming,LI Pei,HAN Dong-ying,LIU Bin
		DOI: 10.3969/j.issn.1000-1158.2015.06.17
		Aiming at the problem of weak signal detection under strong noise background, a novel method of weak signal detection based on variable scale multi-stable stochastic resonance is proposed. The weak signal detection ability of multi-stable stochastic resonance system is better than the bistable stochastic resonance system, which provided a new method for the detection of weak signal under strong noise background. First, the signal which is under large-scale frequency conditions while cannot occur stochastic resonance is processed by variable scale sub-sampling compression to make it to meet the conditions of stochastic resonance, then making the signal through a multi-stable system and adjusting the parameters to get the spectral characteristics of the signal, finally, comparing it with the characteristic frequency gained from the bistable stochastic resonance method.The simulation and experiment results show that under the same conditions, it is more accurate using the multi-stable stochastic resonance method to obtain frequency than the bistable stochastic resonance method, the proposed method also can enhance the signal amplitude, effectively detect weak signal submerged by strong noise.
		2015 Vol. 36 (6): 628-633 [Abstract] ( 848 ) HTML (1 KB) PDF (2572 KB) ( 942 )

	634	A Research on the Method of P300 Feature Extraction Based on Blind Source Separation
		ZANG Li-guo,ZANG Yu-man,JIN Mei,JIN Ju,YU Guo-hui
		DOI: 10.3969/j.issn.1000-1158.2015.06.18
		P300 is widely used in the field of brain cognition and BCI, however, its intensity is so weak that it is easy to suffer from interferences of environment and artifacts of blink, ECG, and EMG and normally submerged in EEG. In order to separate P300 from interferences speedily and efficiently, the feature of P300 in time, frequency and spatial domain are analyzed. A method is proposed based on BSS to extract P300 feature, combining coherence average, wavelet transformation and BSS. A new technique is described aiming at selecting ICs corresponding to P300 after BSS to multi-lead EEG. Three BSS algorithms, Informax, FastICA and AMUSE are compared in the performance of P300 feature extraction. Experimental results verify that the proposed method has an obvious improvement in P300 feature extraction compared with the other methods using temporal and frequency characteristics of P300 only.
		2015 Vol. 36 (6): 634-637 [Abstract] ( 751 ) HTML (1 KB) PDF (2890 KB) ( 1102 )

	638	The Miniaturization of Physical Package for Active Atomic Hydrogen Maser
		ZHANG Wei-qun,HE Ke-liang
		DOI: 10.3969/j.issn.1000-1158.2015.06.19
		In order to achieve miniaturized maser of active hydrogen atomic clock,the improvement of the physical package is made.The structure of resonator and storage bulb,vacuum system,constant magnetic field coil, beam optical system and magnetic shielding system are theoretical analysed and designed,and also related verification experiments are made.Double vacuum structure design effectively reduces the size of the hydrogen maser. The prototype of hydrogen atomic clock for space applications is developed,getter technology and composite pump technology further reduce the active hydrogen atomic clock dimensions and weight.
		2015 Vol. 36 (6): 638-641 [Abstract] ( 691 ) HTML (1 KB) PDF (2380 KB) ( 543 )

	642	Research on the Establishing Scheme of Local Time Standard
		HUANG Yan1,ZHANG Han1,GAO Yuan2
		DOI: 10.3969/j.issn.1000-1158.2015.06.20
		To test satellite navigation products, the establishing scheme of local time standard steered by national time standard is proposed. The scheme establishes a GPS common-view time transfer system, traces the local atomic clock to UTC(NIM) by data comparison, filters data by Vondrak method and abandons abnormal data. The scheme determines that can influence the comparison accuracy, including that the ionosphere delay real-time values observed at two frequencies is revised, the antenna coordinate is set to base mode, and the data with elevations above 30° are selected, so the comparison accuracy can be improved. A predict equation is solved, and the real-time value transfer is ultimately implemented. Experiments show that local time standard and national time standard synchronize within ±10ns, and the accuracy and stability are improved.
		2015 Vol. 36 (6): 642-646 [Abstract] ( 596 ) HTML (1 KB) PDF (4143 KB) ( 442 )

	647	Monte Carlo Simulation for X-ray Spectrum on Industrial Molybdenum Target Units
		GE Shuang,WU Jin-jie,QIU Xiao-ping,CHEN Fa-jun
		DOI: 10.3969/j.issn.1000-1158.2015.06.21
		The Monte Carlo simulation program EGSnrc is adopted to simulate components of industrial X-ray mammography target units and the transportation process for photons which is produced by 28 keV electron beam bombarding a molybdenum target . The particle phase space files which is gained on a plane away the focus at 50 cm and a radius 5 cm radiation field.The information, like particle fluence, energy spectrum distribution, angular distribution, average energy and so on,can be obtained by the analysis of the phase space files. Simulated the molybdenum target X-ray spectrum distribution is affected by filter material and tube voltage. The mean energy of molybdenum filtration is less than rhodium filter, but the impact of higher energy part is greater than the rhodium filter, with tube voltage increasing, the effective production rate of photon and the mean energy are all increased.Under the four groups radiation quality conditions, the mean energy of mammography X-ray spectra are each 16.0, 16.6, 17.0, 17.8 keV, and close to the experimental measurements, the relative error in less than 1%.
		2015 Vol. 36 (6): 647-651 [Abstract] ( 608 ) HTML (1 KB) PDF (2199 KB) ( 711 )

	652	Preparation of Reference Material for Quantitative Detection of Escherichia Coli
		XUE Lei,LIN Jing,SUI Zhi-wei,WANG Jing,LIU Xiao-xia, FU Bo-qiang,ZHANG Ling,HAO Lin
		DOI: 10.3969/j.issn.1000-1158.2015.06.22
		The protective effect of freeze-dried protectant, homogeneity and stability of the escherichia coli reference material are verified by plate count method. The results show that the protection of the composite protective agent reach 53.19%, and it can effectively protect the escherichia coli during freeze-drying. After escherichia coli and the freeze-dried protectant mixed, frozen, dried and prepared a dry powder reference materials of escherichia coli,its shape, rehydration speed and homogeneity are good, and it can be stable for six months. The reference material can be used to quality control of food testing laboratory and evaluation of food test results.
		2015 Vol. 36 (6): 652-656 [Abstract] ( 566 ) HTML (1 KB) PDF (455 KB) ( 1017 )

	657	Development of Immunochip for Detection of Clenbuterol Residue
		SUN Lai-yu,QIAN Kun,SHAO Chao-gang,YIN Li,YAN Qiong-qiong, LU Yun-hua,YANG Jin-tian
		DOI: 10.3969/j.issn.1000-1158.2015.06.23
		Immunochip is designed in order to realize the massive detection of clenbuterol residue.Slide glass surface as the carrier is modified by APTES-DGA.The clenbuterol antibody is coupled to the slide glass surface.Glass surface active groups are blocked by bovine serum albumin. The samples and standards, horseradish peroxidase labeled clenbuterol are added into the immunochip.CLB and CLB-HRP are combined competitively with Ab (CLB).Chemiluminescence reaction is catalyzed by the horseradish peroxidase and optical signal value is detected Sampling volume, incubation temperature, incubation time, concentration of washing solution, chemiluminescence integral time are tested.The results show that glass slide with APTESDGA has a better signal uniformity and antibody coupling ability. In the detection process, immunochip signal is stable when sampling volume is 50 μL, incubation temperature is 37 ℃, incubation time is 30 min, wash solution concentration is 10 fold diluent and chemiluminescence reader integral time is 60 s. The method is fast, simple and accurate by immunochip analysis for clenbuterol residue.
		2015 Vol. 36 (6): 657-661 [Abstract] ( 794 ) HTML (1 KB) PDF (2036 KB) ( 445 )

	662	One Way of Accuracy and Reliable Method for Intermediate Checks
		FAN Qiao-cheng,ZHENG Lei,JIANG Rong-hua
		DOI: 10.3969/j.issn.1000-1158.2015.06.24
		Through the measurement of selected check standard,using the maximum permissible errors and calibration certificate given calibration results and its uncertainty of the standard which to be check, to determine the "center line ", the upper and lower control limits and warning line of the check measurement control chart. Using the Excel spreadsheet to draw the control limit, to make each check measurements in figure intuitive accurately reflect the error or the value change of direction and size of the standard which to be check. The results can also be used as the basis for assessment of stability for measurement standard.
		2015 Vol. 36 (6): 662-665 [Abstract] ( 654 ) HTML (1 KB) PDF (648 KB) ( 512 )

	666	The New Philosophical View about Measurement Error Theory
		YE Xiao-ming,LING mo,ZHOU Qiang,WANG Wei-nong,XIAO Xue-bin
		DOI: 10.3969/j.issn.1000-1158.2015.06.25
		Aiming at the logic entanglement between systematic error and precision, and analyzing the most typical systematic error in geodesy field, this article reveals the errors classification theory actually comes from the narrow perspective caused by measurement specialization and that it is a narrow philosophical view such as the India philosophy story “six blind men and an elephant”. Through proving that systematic errors also follow random distribution and discussing some related problems, this article has proposed a new error epistemology that all errors follow random distribution, and confirmed that only the measurement uncertainty concepts system is scientific, and given the reasons that the definition of errors classification and some conceptions-derived, such as of precision, trueness and accuracy, should be erased.
		2015 Vol. 36 (6): 666-670 [Abstract] ( 1195 ) HTML (1 KB) PDF (1256 KB) ( 721 )

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