电子天平的砝码自动检定系统设计

本文介绍了电子天平对砝码自动检定的控制程序编程系统。叙述了采用VB6.0语言作为软件设计开发平台,用Excel中文版电子表格处理软件来处理砝码检定原始记录表数据,设计了MSCOMM控件,用来实现串行通信,通过PC机与电子天平的标准接口命令集信息交换,使带有RS232C接口的电子天平能够简单地集成到PC机或数据采集系统并充分利用其各种性能,通过接口传输命令实现天平自动检定砝码的功能。     

移液器数据的自动传输处理系统

解决移液器数据人工处理耗时繁琐的问题,应用蓝牙技术进行电子天平与电脑间的数据传输,并用MATLAB软件对数据进行解析,生成原始记录与证书。系统经过测试,各方面表现稳定可靠。     

密度计称量法检测软件系统的设计

软件结合密度计称量法检测装置配套使用,主要完成电子天平称量数据自动采集计算.下位机运动控制,电子原始记录自动生成,数据查询统计等功能.很大程度提高了工作效率,并且降低了出错率,具有良好的推广价值.     

电子天平期间核查的实施和数据分析

<正>实验室在对电子天平定期进行检定或校准的基础上,还必须做好电子天平的期间核查,尤其是对使用频率较高、环境变化较多的电子天平,以确保检查数据的稳定度和准确度。一、核查规则以JJG1036-2008《电子天平检定规程》、JJG99-2006《砝码检定规程》为依据,以《电子天平内校规程》、电子天平说明书为指导,对实验室I级电子天平进行期间核查。核查频率视电子天平的使用频率和工作环境而定,在电子天平两次     

环境温度对高精度电子天平称量准确度的影响

为了研究环境温度对高精度电子天平称量准确度的影响,根据电子天平称量原理,从理论上分析了环境温度对电子天平传感器的影响,并提出了一种温度补偿方法。实验结果表明,当环境温度在10℃~40℃范围内变化时,具有温度补偿功能的电子天平最大示值误差为-0.4e,满足《JJG1036-2008电子天平检定规程》对称量准确度的要求。     

浅谈用户在实际运用中如何通过电子天平校准证书确立最小称量值

文章从电子天平的检定与校准出发,论述了电子天平校准与检定的区别以及使用方对电子天平校准证书如何运用,最后通过校准证书确立电子天平最小称量值,帮助电子天平使用厂家在开展工作时选择符合自己要求的电子天平。     

电子天平示值误差测量结果的不确定度评定

本文以电子天平为研究对象,分析了电子天平示值结果不确定度的来源并结合实际应用的情况,详细介绍了电子天平示值误差测量结果的不确定度评定方法.     

电子天平闪变点及示值误差的计算

正一、如何确定电子天平的闪变点工作中怎么确定电子天平的闪变点,可以通过下面几个实例加以说明。案例1已知一台电子天平的检定标尺分度值e=d=1g,此天平属于e5d,应考虑引进修正误差。当我们用一个实际质量为200.0g的标准砝码,加放到电子天平的秤盘上时,电子天平的显示值为200g。然后,逐渐在电子天平的秤盘上轻缓地添加1/10d(100mg)的标准砝码,当我们加到400mg(ΔL)时,电子天平的显示数字发生了在200g和201g交替显示的情况,     

电子天平测量结果不确定度的研究

为解决电子天平在测量过程中达到用测量不确定度来统一评价测量结果质量的问题,对电子天平测量结果不确定度进行了研究。依照电子天平复现质量之差的原理,采用分析误差源的方法,研究测量过程中用电子天平来复现质量,给测量结果引入不确定的范围。通过本方法的研究而得到电子天平测量结果不确定度,对电子天平测量结果的质量有了比较可靠的保证。     

电子天平检定过程的初略分析

电子天平具有操作简便、称量速度快、精确度高等优点,已广泛应用于各个领域,只有对电子天平进行定期检定,才能避免其性能下降。本文依据JJG1036-2008《电子天平》检定规程着重从电子天平的原理和性能要求来分析电子天平的检定与校准。     

Secure and Efficient Data Storage and Sharing Scheme Based on Double Blockchain

In the digital era, electronic medical record (EMR) has been a major way for hospitals to store patients’ medical data. The traditional centralized medical system and semi-trusted cloud storage are difficult to achieve dynamic balance between privacy protection and data sharing. The storage capacity of blockchain is limited and single blockchain schemes have poor scalability and low throughput. To address these issues, we propose a secure and efficient medical data storage and sharing scheme based on double blockchain. In our scheme, we encrypt the original EMR and store it in the cloud. The storage blockchain stores the index of the complete EMR, and the shared blockchain stores the index of the shared part of the EMR. Users with different attributes can make requests to different blockchains to share different parts according to their own permissions. Through experiments, it was found that cloud storage combined with blockchain not only solved the problem of limited storage capacity of blockchain, but also greatly reduced the risk of leakage of the original EMR. Content Extraction Signature (CES) combined with the double blockchain technology realized the separation of the privacy part and the shared part of the original EMR. The symmetric encryption technology combined with Ciphertext-Policy Attribute-Based Encryption (CP–ABE) not only ensures the safe storage of data in the cloud, but also achieves the consistency and convenience of data update, avoiding redundant backup of data. Safety analysis and performance analysis verified the feasibility and effectiveness of our scheme.     

电子天平零点误差的确定及应用

按照电子天平检定规程的要求,所有示值误差应是对零点误差修正后的修正误差,但规程并没有给出零点误差测试的方法,因此,如何确定电子天平的零点误差,长期困惑着从事天平计量的工程师。本文旨在探讨电子天平零点误差的确定方法,以用于电子天平检定/校准过程中对示值误差的修正,从而满足规程的要求。     

基于SVM的电子分析天平温度漂移补偿方法

电磁力平衡传感器等关键部件的温敏特性是引起电子分析天平温度漂移的主要因素。针对电子分析天平温度漂移问题提出了基于支持向量机的补偿方法。通过分析引起电子分析天平温度漂移误差的原因,将温度敏感部件的温升和电子分析天平的温度漂移数据作为模型输入,运用自适应参数优化方法寻找最优参数,建立电子分析天平温度漂移误差模型并进行温度漂移补偿。通过对量程200g、分辨力0.1mg的电子分析天平进行补偿检验,结果表明全量程内的示值误差绝对值≤0.3mg,优于国家标准GB/T 26497-2011《电子天平》规定的I级天平对温度漂移指标的要求。     

Blockchain-Based Trusted Electronic Records Preservation in Cloud Storage

Cloud storage represents the trend of intensive, scale and specialization of information technology, which has changed the technical architecture and implementation method of electronic records management. Moreover, it will provide a convenient way to generate more advanced and efficient management of the electronic data records. However, in cloud storage environment, it is difficult to guarantee the trustworthiness of electronic records, which results in a series of severe challenges to electronic records management. Starting from the definition and specification of electronic records, this paper firstly analyzes the requirements of the trustworthiness in cloud storage during their long-term preservation according to the information security theory and subdivides the trustworthiness into the authenticity, integrity, usability, and reliability of electronic records in cloud storage. Moreover, this paper proposes the technology framework of preservation for trusted electronic records. Also, the technology of blockchain, proofs of retrievability, the open archival information system model and erasure code are adopted to protect these four security attributes, to guarantee the credibility of the electronic record.     

万分之一电子天平示值误差测量不确定度的评定

本文依据JJG 1036-2008《电子天平》检定规程,对万分之一电子天平示值误差测量不确定度评定进行分析。     

注射重量法制备气体标准物质中液体称量的数学模型和不确定度评价

由于操作简便和易于读数等优点,电子天平在气体标准物质制备过程中正逐步取代机械天平,成为称量的主要手段。根据ISO 6142中有关对气体称量的数学模型和不确定度的评价,建立了注射重量法制备气体标准物质中使用电子天平称量液体的数学模型,并对称量过程的不确定度进行了评价。     

基于区块链技术的空调产品电子病历共享方案

随着空调领域大数据和智能化的飞速发展,良好的数据管理模式变得十分重要.本文首次提出一种将区块链作为底层技术的空调产品电子病历共享方案,旨在构建一个去中心化和第三方信任的空调病历信息共享平台.通过运用哈希计算、非对称加密和全网共识等技术,达到对空调故障病历数据的全网可信,突破个人、企业之间的信任壁垒.研究表明:基于区块链...     

水力平衡阀在一次泵变流量系统中的应用

针对一次泵变流量异程管路空调水系统中的水力失衡问题,指出在各末端设备设置动态压差平衡型电动调节阀及干管上设置静态平衡阀,可有效解决该问题。     

Research on Electronic Document Management System Based on Cloud Computing

With the development of information technology, cloud computing technology has brought many conveniences to all aspects of work and life. With the continuous promotion, popularization and vigorous development of e-government and e-commerce, the number of documents in electronic form is getting larger and larger. Electronic document is an indispensable main tool and real record of e-government and business activities. How to scientifically and effectively manage electronic documents? This is an important issue faced by governments and enterprises in improving management efficiency, protecting state secrets or business secrets, and reducing management costs. This paper discusses the application of cloud computing technology in the construction of electronic file management system, proposes an architecture of electronic file management system based on cloud computing, and makes a more detailed discussion on key technologies and implementation. The electronic file management system is built on the cloud architecture to enable users to upload, download, share, set security roles, audit, and retrieve files based on multiple modes. An electronic file management system based on cloud computing can make full use of cloud storage, cloud security, and cloud computing technologies to achieve unified, reliable, and secure management of electronic files.     

电子天平制备标准气体称量过程不确定度的评定

分析和识别了使用电子天平配制标准气体时称量过程不确定度分量的来源,根据数学模型对各分量进行了合成。通过实例分析,对称量过程不确定度的评定进行了量化。