R0-代数(NM-代数)的布尔MP滤子与布尔MP理想

在R0-代数中引入布尔MP滤子与布尔MP理想的概念,给出其若干充要条件,研究了它们与素滤子、极大MP滤子的关系。通过反例指出了关于超MP滤了的一个错误结论,给出超MP滤子的一个充分必要条件。在此基础上研究了R0-代数的结构,用布尔MP滤子与布尔MP理想刻画了二部R0-代数、强二部R0-代数的特征。     

R0-代数上的同余关系

研究了Ro-代数上的同余关系,首先通过探讨一类Ro-代数,建立起滤子与同余关系之间的联系,进而深入到其乘积上,最后以模糊滤子为工具定义R0－代数上的同余关系,讨论了滤子与模糊滤子之间的联系,并给出了由同余诱导的商R0－代数。     

BR0-代数的无序表示形式及WBR0-代数性质

对BR0-逻辑代数进行了进一步研究,得到了BR0-逻辑代数的一种无序表示形式,使得BR0-代数中的序关系蕴涵于BR0-代数的基本运算⊕和→之中,并根据BR0-代数的无序表示形式提出了WBR0-代数理论,初步地讨论了其中的性质.     

三角代数的模糊滤子

引入三角代数和三角代数中滤子的概念,研究三角代数中滤子的性质.给出了三角代数中模糊滤子的概念,进一步给出三角代数模糊滤子的等价刻画;研究了三角代数中滤子与模糊滤子之间的关系,并证明由滤子可以诱导出模糊滤子,反之,由模糊滤子也可以诱导出滤子.     

R0代数的对偶代数

对于R0代数，给出了它的一个等价形式，并建立了它的对偶代数，从此刻划了R0代数内部结构的特征，也为从语义的角度进一步研究模糊逻辑系统提供了一个新的途径。     

R_0代数的可证等价类

讨论了R0代数的滤子以及相应的可证等价类.在R0代数里给出了一些滤子的具体例子,得到:F是R0代数M的超滤当且仅当F是M的固执滤子;当F是R0代数的蕴涵滤子时,M/F是布尔代数;当F是R0代数的极大布尔滤子时,M/F是只有两个元的布尔代数.     

R0代数的注记

讨论了R0代数与MV代数的关系，给出了R0代数的一种根。     

赋值为R0-模糊集的逻辑系统

研究了赋值的R0－模糊集逻辑系统W^－X的语义理认,到了若干结果,特别是对W^-x而言,F（S）的α－重言式类只有1／2－重言式类与重言式类两类。     

MTL代数的蕴涵滤子与正蕴涵滤子

在MTL代数M上引入了蕴涵滤子、正蕴涵滤子的概念,研究了它们的性质,给出了M的非空子集成为蕴涵滤子及正蕴涵滤子的充要条件和M的蕴涵滤子成为正蕴涵滤子的充要条件.讨论了蕴涵滤子与正蕴涵滤子的关系,得到了M的每一个正蕴涵滤子都是蕴涵滤子,但反之不真.     

L-区间值模糊滤子空间及其Hausdorff分离性

对有中间元的完备DeMorgan代数L,本文定义了L-区间值模糊集和L-区间值模糊滤子空间的概念,讨论了L-区间值模糊滤子空间的性质。此外,还定义了L-区间值模糊滤子空间的Hausdorff分离性,并研究了它的性质。     

模糊自适应滤波的主动控制方法研究

由于主动控制中广泛使用的自适应滤波 - x L MS算法只适用于线性控制问题 ,针对一些非线性问题 ,本文提出利用一种非线性自适应滤波方法——基于模糊逻辑系统的自适应滤波方法来解决一类参考信号与外扰呈非线性函数关系的前馈主动控制问题。仿真结果表明 ,该模糊自适应滤波器优于线性滤波器的控制效果     

Experimental evaluation of R22 and R407C evaporative heat transfer coefficients in a vapour compression plant

The mean heat transfer coefficients of R22 and R407C in the coaxial counterflow evaporator (20 mm ID) of a refrigerating vapour compression plant have been experimentally measured. The experimental conditions under which heat transfer coefficients were determined reflect a typical working situation for small-scale refrigeration systems. The heat flux ranged from 1.9 to 9.1 kW/m² and the mass flux was varied from 30 to 140 kg/m² s. The results illustrate that the R22 heat transfer coefficient is always greater than that of R407C. Furthermore, a comparison carried out between the experimental data and those predicted by means of the most credited literature relationships showed a strongly overprediction for R407C coefficients.     

扰动模糊逻辑I2的最大子代数及其广义重言式

运用R0-蕴涵算子，找到扰动模糊命题逻辑I^2的一个最大子代数IR，进而将逻辑系统否中的广义重言式理论推广到IR中，得到类似的结果。由此说明关于一维赋值格的结果需要加一定的限制条件才能推广到二维赋值格上去。     

R404A和R410A应用于平行流冷凝器的模拟分析比较

采用分布参数法对平行流冷凝器建立数学模型，对目前广泛使用的制冷剂R134a和低温制冷剂R404A和R410A在平行流冷凝器中的换热和流动性能进行模拟计算和分析比较。分别在相同和不同工况下。比较3种制冷剂的换热系数及压降等换热和流动性能参数。结果表明，在采用平行流冷凝器的汽车空调工况范围内，R410AR404A的流动和传热性能均优于R134a，更适宜用于汽车空调用平行流冷凝器。     

Mass flow characteristics and empirical modeling of R22 and R410A flowing through electronic expansion valves

The applications of electronic expansion valves (EEVs) into multi-type heat pumps and inverter heat pumps in building air-conditioning systems have increased for comfort environmental control and energy conservation. However, test data and mass flow models of EEVs are very limited in open literature. The objectives of this study are to investigate the mass flow characteristics of R22 and R410A through EEVs and to develop an empirical correlation for the prediction of mass flow rates of R22 and R410A through EEVs. Mass flow rates through six EEVs were measured by varying the EEV opening, inlet and outlet pressures, and the subcooling. Mass flow rates of R410A were compared with those of R22 at the same test conditions. Based on the experimental data, an empirical correlation for mass flow predictions in EEVs was developed by modifying the orifice equation. The predictions of the present correlation showed good agreement with the measured data with average and standard deviations of 0.76% and 5.9%, respectively. Approximately 92% of the measured data were within ±10% of the predictions.     

The thermal conductivity of R22, R142b,R152a,and their mixtures in the liquid state

An experimental apparatus for measuring the thermal conductivity of liquids by the transient hot-wire method was constructed and tested with toluene as a standard liquid. Measurements were performed on R22, R142b, and R152a. The thermal conductivities of mixtures of R142b and R152a with R22 were also measured by varying the weight fraction of R22. Experiments were performed in the range from –50 to 50°C and from 2 to 20 MPa and the measured data are analyzed to obtain a correlation in terms of temperature, pressure, and composition of the mixture. While the thermal conductivity of R22 + R152a mixtures varies monotonously with composition, that of R22 + R142b mixtures turned out to go through an extremum value. The accuracy of our measurements is estimated to be within 2%.Paper dedicated to Professor Joseph Kestin.     

Transport properties of refrigerants R32, R125, R134a, and R125+R32 mixtures in and beyond the critical regionPropriétés de transport des frigorigènes R32, R125, R134a et des mélanges de R125+R32 dans et au-delà la région critique

A practical representation for the transport coefficients of pure refrigerants R32, R125, R134a, and R125+R32 mixtures is presented which is valid in the vapor–liquid critical region. The crossover expressions for the transport coefficients incorporate scaling laws near the critical point and are transformed to regular background values far away from the critical point. The regular background parts of the transport coefficients of pure refrigerants are obtained from independently fitting pure fluid data. For the calculation of the background contributions of the transport coefficients in binary mixtures, corresponding-states correlations are used. The transport property model is compared with thermal conductivity and thermal diffusivity data for pure refrigerants, and with thermal conductivity data for R125+R32 mixtures. The average relative deviations between the calculated values of the thermal conductivity and experimental data are less than 4–5% at densities ρ0.1ρ_c and temperatures up to T=2T_c.     

R22和R417A应用于空气源热泵热水器的性能对比研究

在不同的环境温度下,对R417A在空气源热泵热水器应用中的性能特性和R22进行对比实验。结果表明：R417A可以直接替代R22在热泵热水器中使用。应用R417A替代R22,可以明显地降低排气温度和排气压力,有利于系统安全运行,提高压缩机的使用寿命。但是,在直接替代条件下,R417A制热性能系数（HCOP）LLR22小。     

Drop-in replacement of R22 in heat pumps used for district heating — influence of equipment and property limitations

In Swedish district heating systems several large (25 MW) turbo-compressor driven heat pumps using R22 are installed. The only commercially available alternative is R134a, but its use could decrease the heating capacity by 35%. In this paper a method for finding the best working fluid for a specific heat pump plant is presented, and applied to a district heating plant. First, a screening is made among almost 2000 mixtures, using criteria such as condenser pressure, Mach number and temperature glide. Simulations of the plant are then made to investigate the change in heating capacity and COP when using a mixture instead of R134a. The results show that there are mixtures that can offer a substantially higher heating capacity than R134a, but there is a decrease in COP. The importance of considering the limiting parameters of the heat pump, such as maximum volume flow to each compressor stage and minimum evaporator pressure, is shown.