钟罩式气体流量标准装置控制单元的研制

利用现有的钟罩装置,加装精密光栅尺作为钟罩位移传感元件,并增设多路温度、压力传感器,设计了由计算机和控制器组成的自动检定系统。以控制器研制为核心,详细阐述了信号采集、调理、阀门控制等硬件电路设计和检定数据采集、处理等软件部分设计。     

The Watson Theorem Prover

Watson is a general-purpose system for formal reasoning. It is an interactive equational higher-order theorem prover. The higher-order logic supported by the prover is distinctive in being type free (it is a safe variant of Quine's NF). Watson allows the development of automated proof strategies, which are represented and stored by the prover in the same way as theorems. The mathematical foundations of the prover and the way these are presented to a user are discussed. The paper also contains discussions of experiences with the prover and relations of the prover to other systems.     

气水置换法检定钟罩体积的热力学修正模型研究

气水置换法与几何测量法分别检定同一钟罩的体积时,两者的结果存在显著的系统误差.为查找根本原因以消除系统误差,分析了气水置换法检定钟罩体积过程中湿空气的气体热力学参数变化规律.基于质量守恒定律,建立了在封闭系统中水蒸气质量变化与热力学参数变化之间的关系模型.在控制较为严格的检定条件下对关系模型进行了简化,并建立了可供实际...     

质点法机器证明视角下的近世几何研究

优化并发展了质点法机器证明算法的核心程序,用Mathematica创建了新的几何定理证明器。拓展了机器证明的研究范畴,首次实现了近世几何的机器证明,且可读性令人满意。在该证明器的帮助下,发现了一些新的近世几何性质,深化了近世几何的研究成果,并对已有的近世几何研究成果提出一些意见。     

Improvement and uncertainty evaluation of mercury sealed piston prover using laser interferometer

Many NMIs (National Measurement Institute) and calibration laboratories are using a mercury sealed piston prover as calibration system for gas flow meter. But it has problems in deciding measuring volume, traveling time of piston and generating low flow rate below 10 cc/min. In this study, a new structure of a piston prover is designed and its flow measurement uncertainty is evaluated according to ISO/IEC 17025. A laser interferometer, instead of optical sensors used in a typical piston prover, is employed to measure testing time and moving distance of the piston, accurately. A new material of the piston is used to eliminate contaminated particles from the material of the piston body. Uncertainty is calculated by evaluating various uncertainty factors which have influence on gas flow measurement. The expanded uncertainty of the piston prover is 0.11% at the confidence level of 95%. The uncertainty evaluation procedure of this study would be useful in flow measurement uncertainty determination of other types of gas flow measurement systems.     

RRTP - A Replacement Rule Theorem Prover

The Replacement Rule Theorem Prover (RRTP) is an instance-based, refutational, first-order clausal theorem prover. The prover is motivated by the idea of selectively replacing predicates by their definitions, and operates by selecting relevant instances of the input clauses. The relevant instances are grounded, if necessary, and tested for unsatisfiability by using a fast propositional calculus decision procedure.     

入侵检测中的快速过滤算法

入侵检测系统是近年来发展迅速的一种网络安伞技术。但是,随着计算机网络向着高速、宽带的方向发展，检测引擎越来越成为性能的瓶颈.如果检测速度不能跟上网络流最，就会丢包并发生漏报。这除了采用更高速的专业硬件来解决外，包过滤算法也有非常重要的作用，高述的过滤算法有助于过滤掉大量无关的信息，从而极大地提高入侵检测系统的性能。     

Mechanical Verification of an Ideal Incremental ABR Conformance Algorithm

The Available Bit Rate protocol (ABR) for ATM networks is well adapted to data traffic by providing minimum rate guarantees and low cell loss to the ABR source end system. An ABR conformance algorithm for controlling the source rates through an interface has been defined by ATM Forum, and a more efficient version of it has been designed by Rabadan and Klay. We present in this work the first complete mechanical verification of the equivalence between these two algorithms. The proof is involved and has been supported by the PVS theorem prover. It has required many lemmas, case analysis, and induction reasoning for the manipulation of unbounded scheduling lists. Some ABR conformance protocols have been verified in previous works. However, these protocols are approximations of the one we consider here. In particular, the algorithms assume a bound on the number of rates to be scheduled.     

A Graphical User Interface for Formal Proofs in Geometry

We present in this paper the design of a graphical user interface to deal with proofs in geometry. The software developed combines three tools: a dynamic geometry software to explore, measure, and invent conjectures; an automatic theorem prover to check facts; and an interactive proof system (Coq) to mechanically check proofs built interactively by the user.     

定理证明辅助工具Isabelle剖析与应用

Isabelle是一个通用的定理证明器,应用领域广泛.介绍Isabelle逻辑系统的功能和构成,分析了Isabelle的规格说明语言、验证系统的特点,并给出了用Isabelle逻辑系统来构造Z规格说明的定理证明的方法.