Conducting a stability check for joule balance after kilogram redefinition is crucial. This study investigates the mass measurement difference between joule balance and primary mass standard. Measurement results obtained in three different ways were compared and analyzed: the joule balance in vacuum, the primary working mass standard in China with M_one in vacuum, and the primary working mass standard in China with M_one in air. The experiments demonstrated that the mass measurement results based on the joule balance and primary mass standards are consistent with each other within the relative standard uncertainty of 4 x 10(-8).

Center of mass (CM) height is a critical mass property of an artifact. It is needed in the aerospace industry, conventional vehicle manufacturing, and measurements of the gravitational constant, $G$ . Despite many experiments and research efforts, a standard or a traceable method to determine CM height remains undefined in precise measurements. This article described a new method to measure CM height using a bi-weighing bridge measuring system, which can effectively eliminate the measurement error that exists in the joint between the weighbridge and the artifacts. Tests on the weight were carried out by this method, and we obtained the CM height of the test weight to be 34.56 mm, with a combined standard uncertainty of 0.08 mm. This is a relatively small uncertainty for measuring artifacts with mass in 1 kg, among previous studies reported until now. Compared to a conventional method, the CM height estimated by the new method is verified to be much closer to the theoretical value.

In this study, an optical system for linking quartz crystal microbalance (QCM) sensed nanograms to laser power has been demonstrated by hybridising a laser power measuring system with a QCM. QCM sensed masses are linked with equivalent masses of the photon radiance force at nanogram level with acceptable differences and/or errors. For laser power at 5.78 mW–85.1 mW, equivalent masses of photon radiance force are 2.78 ng–40.96 ng, respectively. Correspondingly, mass dependent resonant frequency shifts sensed by QCM are 0.88 Hz–10.83 Hz, indicating that QCM sensed mass changes are 3.53 ng–43.32 ng, respectively. Updates and improvement toward the measurement system are still needed to get rid of the small differences and/or errors between photon radiance force equivalent masses and QCM sensed masses. The calibrations of the geometry and optical instrument are necessary for translating this method into traceable applications.

To improve measurement efficiency, calibration laboratories are gradually employing automatic measurement systems instead of manual measurements. At present, the data directly generated by the automatic measurement system focuses on the presentation of the measurement results but lacks the key information elements required by ISO-17025 for the original records and certificate reports. In the meantime, when carrying out mass measurements in small nominal values, it is easy to generate incomplete data due to measurement interruptions caused by falling weights. After the measurement, it is often necessary for inspectors to process data manually. Therefore, in the actual inspection work, the data analysis and processing of the automatic measurement system still require a lot of manpower. In this paper, combined with the features of mass measurements in small nominal value, a data analysis and processing method based on the automatic measurement system was proposed. Functions such as automatic segmentation and reorganization of data, identification of unqualified results, and processing of incomplete data were added. reduces the interference of human factors. The method realized automatic analysis of data, automatic generation of original records and certificate reports, reduced human factor interference, and further enhanced the efficiency of quality inspection and automatic data processing and analysis.

以OIMLR76国际建议中非自动衡器的称量试验为例,列举了2种容易对非自动衡器称量性能做出误判的情形.结合电子天平称量试验的3个案例,分析了修正误差与最大允许误差限较为接近时,直接采用"简单判定原则"作出符合性判定的误判风险,通过对线性载荷误差测量不确定度评估,分别对3个案例给出了95.45％、80.6％和18.1％的符合性概率.实验结果表明,在非自动衡器测量过程中,线性测量载荷误差满足最大允许误差限要求的非自动衡器,仍然可能存在不符合合格判定要求的风险,在法制计量中非自动衡器测量不确定度评估是降低产生误判结果的有效方法.

高准确度质量测量时需要修正由于被测砝码与标准砝码质心高度差引入的质量差值,因此需要测量质量标准的质心高度.质心高度可通过将质量标准按不同朝向放置在称量桥的不同位置,根据质量测量仪器的示值变化计算得到.研究了 2种质心高度测量方法的不确定度评定,分析了各不确定度来源,给出了不确定度评估方法,并结合实例进行了讨论.

In order to correct the influence on precision mass measurement caused by the difference between centres of the test weight and the reference weight, the centre of the weight need to be measured, and a device is developed to locate the centre of the weight which includes a balance, a bridge and a supporting pole. In this paper, the detailed force analysis of this device is studied, and the detailed information on designing and selecting each part of the device is given.

Continuous totalizing automatic weighing instruments is widely used in many industries, and need to be tested under different conditions especially for different temperature, humidity and electrical disturbance. Usually this kind of weighing instruments are very large and can not be put into such test environments, thus a test sample without belt conveyor is needed. Due to the working principle of continuous totalizing automatic weighing instruments, the test sample may include not only essential part of weighing instruments such as load cell, indicator, and load receptor, but also a device to simulate the displacement of the belt. In the paper, a device that can simulate the velocity of the belt is researched, it can generate square pulse signals to the test sample, thus the sample can operate as normal belt weigher. The configuration of the device is discussed and example is given to show its effectiveness.

本项研究测量了AuNP的k壳层X射线荧光强度.测量到了AuNP溶液浓度在0.1～4.0mg/mL的金元素k壳层荧光光谱特征峰,并得到了特征峰强度与AuNP浓度的线性校准曲线,将金k壳层X射线荧光特征峰在AuNP溶液中可被探测的能力和灵敏度提高了一个数量级,并且扎实地达到了0.1mg/mL.

目的:探讨团体家庭治疗在提高新型毒品依赖患者心理正能量方面的作用.方法:在武汉市2所强制隔离戒毒机构中选取40名新型毒品依赖患者,对其进行团体家庭治疗(共5次,每次2.5小时).团体家庭治疗内容包括关系建立、萨提亚家庭治疗和小物件家庭系统排列.研究过程中分别让患者对自我感觉进行绘画,并对绘画作品的正能量进行自我评估.结果:新型毒品依赖患者的三次自我感觉绘画作品正能量评分分别为(52.4±24.3)、(71.5±14.3)与(90.8±9.3)分,各时点观测值差异有统计学意义(P＜0.001).结论:团体家庭治疗可提高新型毒品依赖患者的心理正能量.

质量单位是国际单位制中7个基本单位之一,在量值传递体系中占有举足轻重的地位.为了应对质量单位重新定义的国际变革,确保千克重新定义后量值传递准确可靠,基于我国能量天平和真空质量测量装置的结构特点,提出了真空容器+双真空传递腔体的量值传递关键技术,实现了实物砝码从真空容器到真空质量测量装置(M-one)的准确可靠传送和真空质量测量.

The high rate of relapse among heroin users remains a significant public concern in China. In the present study, we utilized a Motivation-Skill-Desensitization-Mental Energy (MSDE) intervention and evaluated its effects on abstinence and mental health. Eighty-nine male heroin users in a drug rehabilitation center were enrolled in the study. The participants in the MSDE intervention group (n=46) received MSDE intervention, which included motivational interviewing, coping skills training, eye movement desensitization and reprocessing, and mindfulness-based psychotherapy. The participants in the control group (n=43) received a series of lectures on skills training. A significant increase in Contemplation Ladder score (P<0.001) and decreases in scores on the Obsessive Compulsive Drug Use Scale (P<0.001), Beck Depression Inventory (P<0.001), and Aggression Questionnaire (P=0.033) were found immediately after intervention. Compared to the control group, the MSDE intervention group reported significantly higher abstinence rates (P=0.027) and retention rates (P<0.001) at follow-up. Overall, the MSDE intervention, which uses a combined strategy for relapse prevention, could be a promising approach for preventing relapse among heroin users in China.

The dissemination method after redefinition of mass unit will be changed from Planck constant to primary mass standard and from primary mass standard to secondary mass standard. The measurement of weights under vacuum will replace the measurement of weights in air. M-one manufactured by Mettler-Toledo company is a product for measuring the mass of an object under vacuum. In order to transfer weights from vacuum vessel to M-one, a vacuum transfer equipment (VTE) is developed by National Institute of Metrology, China (NIM). A multistage manipulator system is designed to transfer weight under vacuum between VTE and M-one. The experimental results show that the performance of VTE is efficient for transferring the weights under vacuum.

This report describes the result of an Asia Pacific Metrology Programme (APMP) regional comparison of 50 kg stainless steel mass standard carried out among three laboratories as a collaboration among inter-Regional Metrology Organization (RMO) programs. One weight of nominal value 50 kg has been prepared by CENAM (Mexico) of Sistema Interamericano de Metrología (SIM) for this APMP comparison as an international collaboration. The reported results by participants are consistent with each other and with the key comparison reference value (KCRV) of comparison, CCM.M-K6 to which this comparison has been linked KEY WORDS FOR SEARCH Mass standard Main text To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

Volume of weights is needed for air buoyancy correction, and measurement methods based on hydrostatic comparison are widely used to detect volume of weights. Several different hydrostatic comparison methods are given in OIML R111. In NIM, two different devices had already been set up to measure the volume of weights, and one is based on a mechanical balance, and another is based on an electrical balance. In this paper, two methods are discussed. Detailed measurement procedure and calculation are investigated, and uncertainty evaluation are also given. The consistence of two methods is also discussed based on an example.

Stable and uniform sound distribution is a key factor in high precise volume determination of solid material especially for mass standards. A numerical study is carried out to study the distribution and uniformity of sound pressure. The FEM simulation results show that the sound pressure distribution gradient of the small chamber is better than large chamber. With the FEM model in this paper, the maximum sound pressure level change is only 0.003 DB (RMS). And also for small chamber, the sound pressure signals are higher and more easily to be acquired for real measuring system.

The acoustic volume measuring method is a promising non-contact method for volume determination of mass weights. To improve the measuring accuracy of volume determination with the non-contact acoustic method, an acoustic measuring system with two measuring chambers is newly designed to compensate for the non-linearity measuring errors. When reducing the remaining air in the measuring chamber, the measuring accuracy can be greatly reduced. The volumes of mass standards ranging from 100 g to 5 kg are tested to evaluate the non-linearity errors of the volume measurement. The relative uncertainties of the acoustic volume determination are below 7.0 ×10-4 (k=2).

This paper analyses the influence of air pressure regarding the precise mass measuring process. The stability of air pressure to the mass determination process is discussed experimentally using the new M-one mass comparator. Due to the change of air pressure, air flow and vibration with regard to the weighing hanger can be arisen. The vibration of weighing hanger is from both the base and the air flow. Under air pressure control, the standard deviation of weighing process can be reduced to 0.39 mu g.

动态汽车衡的型式评价依据为目前现行有效的JJG907-2006《动态公路车辆自动衡器检定规程》和GB/T21296-2007《动态公路车辆自动衡器》.动态汽车衡在进行型式评价时需明确其计量参数,其中分度值d是非常重要的一个参数,但常常不被企业人员重视.

重力式自动装料衡器与非连续累计自动衡器是两种广泛使用的自动衡器,具有不同的原理和计量特性.然而这两类衡器在结构上具有一些相似之处,易于造成混淆.本文从计量特性角度出发,研讨了这两类衡器的差异,并以装车站为实例进行了分析,从而说明了重力式装料衡器与非连续累计自动衡器是不同的两类衡器,并明确了如何区分这两类自动衡器.