关于电子衡器安装使用维护的技术探讨——浅谈电子衡器使用应了解的基本知识

电子衡器,是一种具有法制性、技术性的计量工具。电子衡器,是当今“万物互联”时代“物联网”的重要组成部分。电子衡器的安装调试、操作使用与维护管理,是电子衡器稳定运行、称量准确的保证环节。电子衡器制造,应高质量安装、调试、校准;电子衡器用户应学习掌握电子衡器使用的基础知识。使用现场条件、使用环境及使用操作维护,应满足电子衡器的技术要求。电子衡器的使用效果,是技术制造、操作使用与法制管理共同创造的应用成果。     

拖拉机润滑油的选用及注意事项

拖拉机在使用过程中润滑油的选择和正确使用对延缓零件磨损、延长机具使用寿命至关重要,因此,掌握正确使用方法和相关知识十分必要。一、润滑油的选用拖拉机润滑油的选择主要是根据使用条件与内燃机的结构形式和性能,合理正确的选择润滑油的黏度、黏温特性和质量,也就是选择品种和牌号。1)根据使用说明书要求选择。使用说明书上都     

装载机安全使用指南（六）

小心使用千斤顶和提升装置如果要在提升起的装置下工作,一定要使用木块、千斤顶或其他坚硬物体将其支撑固定。在使用千斤顶和提升装置时要确定他们有足够的支撑力。警告：禁止使用混凝土块支撑,因为混凝土块在大负载下可能会崩塌。确保提升装置和千斤顶方便维修。禁止使用有裂痕、弯曲扭曲的千斤顶;禁止使用磨损、扭曲或收缩的电缆;禁止使用弯曲或歪的钩子。     

钳形电流表使用时的注意事项

正钳形电流表是一种常用的测量仪表,被广泛的应用于多个行业中。钳形电流表具有测量精准、稳定性好、使用灵活等多种的优点。我们在使用钳形电流表的时候不仅要对于它的使用步骤有一定的了解,对于他使用的注意事项也是不可忽视的。钳形电流表是一种常用的测量仪表,被广泛的应用于多个行业中。钳形电流表具有测量精准、稳定性好、使用灵活等多种的优点。我们在使用钳形电流表的时候不仅要对于它的使用步骤有一定的了解,对于他使用的注意事项     

如何分析和查找CO2弧焊机常见故障

焊机在使用过程中发生的故障多种多样,产生故障的原因可能是设备(?)有缺陷造成的,也可能是错误使用造成的。因此,在使用前要认真阅读焊机使用说明书,同时还要特别要注意以下几点。     

气弹簧辅助锁定装置在自锁式气弹簧手术床中的应用

各医院使用的医疗手术床,通常采用自锁式气弹簧,但是在使用中故障频发。为增加自锁式气弹簧在手术床中使用的可靠性、安全性,文中介绍了一种气弹簧辅助锁定装置,实际使用证明,效果良好。     

玉米田除草剂的选择与使用

使用除草剂省时、省力,节约成本,提高收益,但同时也易污染环境,造成药害。正确合理使用除草剂是玉米取得高产稳产的关键因素,了解其作用机理和使用方法是选择和使用好除草剂的关键。     

大学教师课堂幽默使用频率与效果的关系初探

本文主要目的在于初步编制大学教师课堂幽默使用频率量表,同时检查大学教师课堂幽默使用频率与使用效果之间的关系。访谈和问卷调查结果表明,编制的大学教师课堂幽默使用频率量表具有较好的信度和效度,可作为教学幽默研究的一种实证研究工具;大学教师课堂幽默使用频率与效果呈显著正相关,大学教师课堂幽默使用具有积极的作用。     

自动化仪器在检验科临床使用精度影响因素及干预措施研究

目的 分析自动化仪器在检验科临床使用精度影响因素及干预措施。方法 选取2022年1—12月医院检验科80件自动化仪器,全年采取自动化仪器质量控制管理,针对自动化仪器使用精度影响因素,制定相应的质量控制干预措施,并比较2022年全年与2021年全年自动化仪器检验准确率、使用质量评分、使用满意度的变化。结果 2022年自动化仪器检验准确率高于2021年(P<0.05);2022年自动化仪器使用质量评分高于2021年(P<0.05);2022年自动化仪器使用满意度高于2021年(P<0.05)。结论 通过质量控制管理,有助于提高检验科全自动仪器的检验准确率与使用质量,从而提高检验人员的使用满意度,可推广使用。     

春季农机安全作业注意事项

1使用前清理、润滑、调整 应按使用说明书要求,进行使用前的清理、润滑和调整,确保机具以良好的技术状态投入作业;对动力机械润滑系统的保养,除按规定的标准使用润滑油外,还要严格遵守润滑系统保养周期和使用规范,定期清洗润滑系统,定期更换过滤部件,减小机件磨损。     

Pattern reconstruction in ultrastructural morphology

A method of image reconstruction which can be used in ultrastructural morphology when a number of comparable structures are available is described. The method is suitable for quasi-regular arrays of objects, and an extension of it allows the average of equivalent objects which could be orientated at random to be obtained. When dealing with crystalline arrays it is first necessary to obtain a leakage-free pattern in which the coarse distortions are suppressed; this pattern is then filtered to obtain a reference. When dealing with several individual objects which must be brought to the same orientation and enlargement, one of the objects is fixed as a reference. In both cases the distortions relative to the reference are eliminated by an iterative process, making a final average possible. In crystalline arrays this method enhances the bandwidth of the pattern in a way that can be estimated quantitatively by figures of merit. Two examples of reconstructions are reported and discussed: a ctenophore macrocilium, regarded as a crystalline structure, and a sectioned flagellum of an insect spermatid.     

微分干涉型光纤振动系统识别技术研究

微分干涉型光纤传感是一种新型的传感系统,可应用于长距离、强电磁干扰环境下的监控和检测。提出了一种基于小波变换的分布式光纤传感信号的识别方法,采用时域-频域能量分布算法,建立不同触发模式的模型,该识别方法可应用于研究入侵信号的模式识别,并通过大量的实际应用经验和数据验证了该方法的有效性。     

Prospects for improvement in EDX microanalysis

There is still considerable room for improvement in the EDX technique, particularly for the analysis of thin samples in transmission electron microscopes. Further research is required to characterize changes which are introduced during specimen preparation and a technique for mass thickness determination has to be established which is both accurate and convenient to implement. Since detector efficiency is difficult to predict at low energies, a suitable standard sample needs to be found which produces X-ray peaks suitable for establishing fixed points on the detector efficiency curve. With current technology, there are several instrumental improvements which can be realized, most of which centre around the use of time-variant pulse-processing circuitry and reduction of electronic noise. Problems of overload with high-voltage microscopes can be minimized, resolution improved and pile-up rejection made more effective so that higher data rates can be accommodated. With the beryllium vacuum window removed, detection of boron is possible provided the influence of electronic noise is minimized but further investigation is still required into the physics of interactions in the first 100 nm layer of the detector.     

基于ANN和GA的机床结构优化设计

机床主轴是机床中的重要部件,其设计对机床性能影响很大。在对主轴设计的各项要求中,刚度和振动稳定性是主要考虑的指标,将其归纳在一个含区域和性能约束的主轴结构优化设计数学模型中。借助有限元软件可获得不同主轴尺寸下的各项性能指标,利用人工神经网络(ANN)实现主轴各项性能指标的近似分析,并采用遗传算法(GA)实现了性能指标为设计变量隐式表达下的机床主轴结构优化设计。     

Planning for integration — a data oriented approach

To achieve succesful integration in a CIM environment the planning process should be based on a data oriented approach. This involves the construction of a strategic data model which shows the key entities and data relationships within the organization. Through the identification of business objectives, and the application systems which support them, the data model provides a stable foundation on which to build an integrated environment. Fundamental to the planning process is the premise that a data model is stable whilst application processes are volatile and indeed should be designed to be flexible.     

被动腕关节柔顺驱动环形刀具的曲面适应性问题研究

通过对现有曲面研抛现状的研究,设计出了一种新型的可用于数控铣床的自由曲面形状自适应柔顺研抛工具系统。工具系统中创新型的使用了被动腕关节机构以及磁流变液力矩伺服机构。其中,被动腕关节机构的使用,使得环形研抛工具能很好的适应工件表面曲率变化;同时磁流变液力矩伺服机构可以控制研抛压力的大小。实现了力/位混合伺服控制,为自动化柔顺研抛提供了一种新的途径。利用ADAMS建立了工具系统的虚拟样机,并对研抛过程的动力学问题进行了仿真实验研究。     

Some experimental verification of predicted load-carrying capacities of contacting pairs

The limiting value of the contact pressure which may be realized between rolling and sliding pairs was studied. Earlier theoretical work has enabled the elastic and shakedown (steady state elastic) pressures to be determined and has indicated the optimum residual stress which should be induced in a wearing surface (e.g. by shot peening) to raise artificially the load-bearing capacity of a material to near its theoretical limit.Here, a rolling-ball-type experiment is described which enables the shakedown limit for a general rolling pair to be verified. Results are presented which verify the predicted pressure limits for a range of geometries and improve confidence in the values predicted for sliding contact. An experimental determination of the shakedown limit for this latter configuration is currently being pursued.Lastly some recent work on stresses remaining after shot peening is correlated with load limits and it is shown that this process is ideal for enabling a wide variety of load limits to be attained.     

PWM整流电源的单片机控制系统

提出一种新的整流电源控制策略 ,它可以使整流电源工作时 ,从电网输入的电流近似为正弦波 ,功率因素接近 1。该控制系统采用 80 98单片机为主体 ,适用于象GTR这样具有较高开关速度的大功率电源系统的控制。     

The spatial rotator

This paper presents a new local volume estimator, the spatial rotator, which is based on measurements on a virtual 3D probe, using computer assisted microscopy. The basic design of the probe builds upon the rotator principle which requires only a few manual intersection markings, thus making the spatial rotator fast to use. Since a 3D probe is involved, it is expected that the spatial rotator will be more efficient than the the nucleator and the planar rotator, which are based on measurements in a single plane. An extensive simulation study shows that the spatial rotator may be more efficient than the traditional local volume estimators. Furthermore, the spatial rotator can be seen as a further development of the Cavalieri estimator, which does not require randomization of sectioning or viewing direction. The tissue may thus be sectioned in any arbitrary direction, making it easy to identify the specific tissue region under study. In order to use the spatial rotator in practice, however, it is necessary to be able to identify intersection points between cell boundaries and test rays in a series of parallel focal planes, also at the peripheral parts of the cell boundaries. In cases where over‐ and underprojection phenomena are not negligible, they should therefore be corrected for if the spatial rotator is to be applied. If such a correction is not possible, it is needed to avoid these phenomena by using microscopy with increased resolution in the focal plane.     

Optimisation of four-sensor probes for measuring bubble velocity components in bubbly air-water and oil-water flows

In a previous paper Lucas and Mishra (2005) [3] a local four-sensor conductance probe was introduced to measure the velocity vectors of dispersed bubbles in bubbly two-phase flow in which the continuous phase is water. There are a very limited number of alternative methods available for bubble velocity vector measurement with which results from, for example, computational fluid dynamic models can be compared and so the four-sensor probe technique is of interest to the multiphase flow community. In the previous paper [3] a mathematical model was presented to calculate the velocity vector of each gas bubble from seven time intervals which were measured using the output signals from each of four ‘needle’ conductance sensors located within the probe. In the present paper, a new technique for making the local four-sensor probe is introduced to minimise interference with the measured bubbles. A new signal processing method is presented using criteria to ensure that (i) the group of sensor signals from which the bubble velocity vector is to be determined are all produced by the same bubble and (ii) bubbles which contact the local four-sensor probe in an ambiguous manner are ignored. The accuracy with which the locations of each of the rear sensors in the probe relative to the lead sensor can be measured influences the accuracy with which the bubble velocity vector can be measured. However, the degree to which the accuracy of the measured velocity vector is affected by errors in the measured probe dimensions is dependent upon the geometrical arrangement of the four sensors within the probe. Experimental results and an error analysis are presented which show that the susceptibility of the velocity vector measurement technique to errors in the measured probe dimensions is reduced if the geometrical arrangement of the four sensors is optimised. As a result of this initial work, an optimised probe, known as the P30 probe, was designed and built and results obtained from the P30 probe in swirling oil-in-water bubbly flow are presented. A probe calibration factor is defined in this paper which can be interpreted as a measure of the interference of a probe with the motion of the bubbles with which it interacts. For the probes described in this paper the calibration factor was found to be much closer to unity than for previous four-sensor probes described in the literature (e.g. [3]) suggesting that these new probes have a much smaller effect on the bubbles’ motion than previous probes.