人工神经元的定性映射模型与定性转化函数

文章将属性量—质特征转化归结为一个定性映射 ,证明了该映射等价于一个人工神经元 ,给出了一个定性映射函数。     

Off-pump coronary artery bypass grafting versus on-pumpcoronary artery bypass grafting: which is better in patients with chronic obstructive pulmonary disease?

INTRODUCTION Conventional coronary artery bypass graftin(CCABG) with cardiopulmonary bypass (CPB) habeen accepted as an effective and safe treatment fomulti-vessel coronary heat disease. CPB may stilcontribute to the operation field because of threlatively easier technical requirement; but it alscauses a serious systematic inflammatory reactiowhich will lead to dysfunction of important organand higher cost for the patients. Off-pump coronarartery bypass grafting (OPCABG) has r…     

江西省南丰县建设用地集约利用评价与研究

土地资源是不可再生资源,是国民经济和社会发展的重要基础,大力推进节约集约用地是严格保护土地资源与保障发展的最佳结合和最优选择。以南丰县为例,分析南丰县建设用地现状及建设用地节约集约利用存在的主要问题,通过建立建设用地节约集约利用评价指标体系和评价模型,对现状建设用地集约度进行评价,并在其基础上提出了建设用地节约集约利用的规划指标控制标准,针对南丰县的实际情况提出了节约集约用地的对策和建议。     

城市土地集约利用变化影响因素研究

提高城市土地集约利用水平是满足城市建设用地供给的重要途径。本文首先从理论上分析了城市土地集约利用变化的影响因素包括供给因素、需求因素以及制度与规划因素;然后利用武汉市1993年-2005年的相关数据,应用主成分回归法进行了实证研究。研究结果表明,经济产出增长、城市非农化水平、全社会固定资产投资、土地增量供给是影响城市土地集约利用变化的重要因素。研究结论认为,选择土地产出率较高的工业用地模式,加快产业结构优化与土地集约利用的相互促进,严格控制城市建设用地增量供给和构建土地集约利用长效机制是提高城市土地集约利用的主要方向。     

Effects of inspiratory muscle training on time-trial performance in trained cyclists

We evaluated the effects of specific inspiratory muscle training on simulated time-trial performance in trained cyclists. Using a double-blind, placebo-controlled design, 16 male cyclists (VO 2max = 64 - 2 ml·kg -1 ·min -1 ; mean - sx ¥ ) were assigned at random to either an experimental (pressure-threshold inspiratory muscle training) or sham-training control (placebo) group. Pulmonary function, maximum dynamic inspiratory muscle function and the physiological and perceptual responses to maximal incremental cycling were assessed. Simulated time-trial performance (20 and 40 km) was quantified as the time to complete pre-set amounts of work. Pulmonary function was unchanged after the intervention, but dynamic inspiratory muscle function improved in the inspiratory muscle training group ( P h 0.05). After the intervention, the inspiratory muscle training group experienced a reduction in the perception of respiratory and peripheral effort (Borg CR10: 16 - 4% and 18 - 4% respectively; compared with placebo, P h 0.01) and completed the simulated 20 and 40 km time-trials faster than the placebo group [66 - 30 and 115 - 38 s (3.8 - 1.7% and 4.6 - 1.9%) faster respectively; P = 0.025 and 0.009]. These results support evidence that specific inspiratory muscle training attenuates the perceptual response to maximal incremental exercise. Furthermore, they provide evidence of performance enhancements in competitive cyclists after inspiratory muscle training.     

黑龙江省耕地集约利用评价及分区研究

耕地资源集约利用的水平和方式直接影响着区域农业生产的效益、粮食的产量、农民的收入和生态环境的质量.本文基于熵值法和“PSR”框架构建评价模型,对黑龙江省县域耕地集约利用进行评价.主要结论如下:①全省各县市的耕地利用集约度属正偏态分布,集约利用状况总体上处于较低的水平.县域间耕地集约利用水平表现出明显的区域差异;②耕地集约利用因素——投入强度、耕作状态和利用效率亦存在互不相同的区域差异;③引起黑龙江省耕地集约利用水平空间分异的原因主要有区位状况、自然特征和经济条件等;④黑龙江省耕地集约利用可以划分为三江平原区、松嫩平原区、山地丘陵区和大中型城市周边区域,并应分别采取规模经营模式、联合-服务经营模式、特色经营模式和复合经营模式,以提高耕地集约利用水平.     

Effects of load mass carried in a backpack upon respiratory muscle fatigue

Purpose: The purpose of this study was to investigate whether loads carried in a backpack, with a load mass ranging from 0 to 20?kg, causes respiratory muscle fatigue. Methods: Eight males performed four randomised load carriage (LC) trials comprising 60?min walking at 6.5?km?h^?1 wearing a backpack of either 0 (LC₀), 10 (LC₁₀), 15 (LC₁₅) or 20?kg (LC₂₀). Inspiratory (P_Imax) and expiratory (P_Emax) mouth pressures were assessed prior to and immediately following each trial. Pulmonary gas exchange, heart rate (HR), blood lactate and glucose concentration and perceptual responses were recorded during the first and final 60?s of each trial. Results: Group mean P_Imax and P_Emax were unchanged following 60-min load carriage in all conditions (p?>?.05). There was an increase over time in pulmonary gas exchange, HR and perceptions of effort relative to baseline measures during each trial (p?p?>?.05). Conclusions: These findings indicate that sub-maximal walking with no load or carrying 10, 15 or 20?kg in a backpack for up to 60?min does not cause respiratory muscle fatigue despite causing an increase in physiological, metabolic and perceptual parameters.     

单片机在非稳态法测定不良导体热导热系数中的应用

介绍了在非稳态法测定不良导体导热系统中，使用单片机进行数据采集、解偏微分方程等复杂数据的处理、测试条件的自动控制，导热系数的自动求取，能直接显示待测材料的导热系数。     

DEA方法在湖北省各城市经济发展分析中的应用

介绍了数据包络分析(DEA)中的C2R模型的原理与方法,并用该方法计算湖北17个城市经济发展的相对效率值,从有效性的角度分析各个城市的发展状况·再结合各地实际情况提出了改进建议·     

以土地资本化推进南昌花园城市建设浅析

以土地资本化推进城市经营模式已成为我国城市经济发展的重要手段之一。南昌进行土地资本化推进花园城市建设有利于城市的建设规划和城市化,从机制上摆脱计划经济时期公共设施、基础设施等只有产出的困境,形成“投入-产出-再投入”的良性循环。它是解决南昌城市建设土地经营问题,实现盘活存量土地和显示土地资产,促进城市土地集约利用的必然选择。