基于可变论域模糊控制的高精度数控机床控制仿真

针对现有高精度机床控制过程中存在的抖振现象和控制误差过高问题,提出一种基于可变论域模糊控制的算法。基于模糊控制理论和模糊控制规则,对输入数据做降维处理,利用计算机语言划分输入量和模糊量的论域,并使用模糊语言表达模糊规则;通过伸缩调整模糊论域避免系统出现过大振荡,并降低输入值与理论值的偏差;经过模糊推理和清晰化处理,得到偏差较小的输出数据,提高数控机床的控制精度。结果表明：所提算法的阶跃响应干扰较小,且有较低的控制误差和偏差波动。     

RSM优化碱性蛋白酶提取米渣中蛋白质的工艺条件

米渣是以大米为原料生产淀粉以后的副产物,含蛋白质在40%以上,具有极其重要的开发利用价值。利用碱性蛋白酶(A lacase)提取米渣中的蛋白质,研究了pH、酶加入量、温度、液固比、提取时间等因素对提取率的影响,在单因素试验的基础上,采用响应面分析法,优化确定了米渣中蛋白质提取的最佳工艺条件为:pH 9.2,加酶量(E/S)1.61%,温度50.2℃,液固比9.2∶1,在此条件下米渣中蛋白质的提取率为56.92%。方差分析结果表明,所建立的模型是可靠的(P0.01)。     

改善牛肉脂肪品质替代品的研究

以植物油为溶剂,水为溶质,添加卵磷酯、单硬脂酸甘油酯、山梨醇酐单油酸酯(Span80)、乳清蛋白等其他添加成分,研制肥牛脂肪替代品,采用了4因子二次通用旋转组合设计,得出最佳配比为单硬脂酸甘油酯0.434%,山梨糖醇酐脂肪酸酯0.110%,卵磷酯0.504%,乳清蛋白0.410%。用冲淡法检测乳状液类型为W/O型。乳状液稳定性的检测结果,测其体积比率为0.59%,达到了稳定体系的要求。     

Delayed onset of photochromism in molybdenum oxide films caused by photoinduced defect formation

We report the photochromic properties of amorphous MoO₃ films deposited by dc sputtering with different O₂ flow rates. The kinetics of film coloration under UV light irradiation is determined using optical transmission spectroscopy. Changes in the absorbance and refractive index were derived from the analysis of transmittance spectra. The absorbance spectra exhibited a growing broad peak centered around 830 nm, which was induced by the UV irradiation. In the early stages of irradiation, the absorbance of the films did not change but their refractive indices did change. This induction time was correlated with the O₂ partial pressure during the film deposition, which was controlled by the O₂ flow rate. The origins of this observation are discussed.     

无线传感器网络的研究现状及发展趋势

无线传感器网络将传感器技术、通信技术、计算机技术结合在一起,具有信息采集、传输、处理的能力。传感器网络最初是由于军事的需要而发展起来的,随着传感器网络技术的逐步发展,它的应用也越来越广泛,现在已从军事防御普及到社会的各个领域。本文以综述的方式介绍了无线传感器网络的发展历史、研究现状以及未来的发展趋势,同时介绍了无线传感器网络的原理,给出了一些典型的应用。     

Agilent VEE 9.0中的多线程

0概述目前的技术环境对测试和测量的要求越来越严格,软件的性能也因此变得至关重要。针对这一要求,一种经证明有效的方法是采用基于并行处理或并行计算的多线程工作方式。     

Formation and emission characteristics of VOCs from a coal-fired power plant

On-site measurements of volatile organic compounds (VOCs) in different streams of flue gas were carried out on a real coal-fired power plant using sampling bags and SUMMA canisters to collect gas samples,filters to collect particle samples,Gas chromatography-flame ionization detector/mass spectrometry and gas chromatography-mass spectrometry was the offline analysis method.We found that the total mass concentration of the tested 102 VOC species at the outlet of wet flue gas desulfuration device was (13456 ± 47) μg·m-3,which contained aliphatic hydrocarbons (57.9％),aromatic hydrocarbons(26.8％),halogen-containing species (14.5％),and a small amount of oxygen-containing and nitrogen-containing species.The most abundant species were 1-hexene,n-hexane and 2-methylpentane.The top ten species in terms of mass fraction (with a total mass fraction of 75.3％) were mainly hydrocarbons with a carbon number of 6 or higher and halogenated hydrocarbons with a lower carbon number.The mass concentration of VOC species in the particle phase was significantly lower than that in the gas phase.The change of VOC mass concentrations along the air pollution control devices indicates that con-ventional pollutant control equipment had a limited effect on VOC reduction.Ozone formation potential calculations showed that aromatic hydrocarbons contributed the highest ozone formation (46.4％) due to their relatively high mass concentrations and MIR (maximum increment reactivity) values.     

我国300家二级以上医疗机构特殊医学用途配方食品(FSMP)管理及临床应用现状调查

目的 调查分析我国二级及以上医疗机构特殊医学用途配方食品(FSMP)规范化管理及临床应用现状。方法 采用在线问卷形式,通过四川省临床营养质量控制中心及华西医院临床营养学科联盟等平台,对全国34个省/直辖市的医疗机构进行抽样调查。结果 共收回300份有效问卷。在FSMP管理方面:24.3%的医疗机构设立了FSMP管理委员会,64.3%的单位制定了本机构《医院特殊医学用途食品目录》;设置FSMP专用仓库、FSMP配制室的医疗机构分别占47.3%、50.7%。40.7%的医疗机构将FSMP纳入信息化管理;43.3%的医疗机构统一编码收费。FSMP临床应用方面:94%的医疗机构在FSMP处方前要求进行营养风险筛查。84.7%的机构要求FSMP处方人员应具备相应资质;近90%的医疗机构由营养医师开具FSMP处方;67.3%的医疗机构要求上级临床医师/营养师对FSMP处方审核后再执行。300家医疗机构均对FSMP使用不良反应进行了监测,仅有30.7%将不良反应的监测数据上报至省/市级临床营养质量控制中心。结论 国家应加强专科收费目录的构建及处方资质培训的统一;各级医疗机构,尤其是西部地区医院及全国...     

Carbon emissions pinch analysis (CEPA) for emissions reduction and energy planning in Canada

Clean Technologies and Environmental Policy - Canada has made a commitment in the Paris Agreement to reduce its total greenhouse gas emissions by 40–45% from 2005 levels by year 2030...