浅谈持续改进在实验室质量体系中的落实

本文对实验室质量体系中持续改进问题在实际工作中如何有效实施,进行了粗浅探讨,并例举了相应的工作方法.具体从树立改进意识、明确改进方向、收集改进信息、抓好改进落实和做好改进评价等五个方面,提出了对有效实施实验室质量体系持续改进的一些认识.     

流化床涂装尼龙法兰改进工艺研究

为使涂层获得较好的效果,针对法兰涂装尼龙技术特点,在现有技术基础上对流化床结构进行了技术改进:改进了微孔透气隔板网筛,由原来的平面网筛改为椭圆矩形球形网筛,改变了气流平行吹送的角度;改进了流化槽形;改进了空气滤网。通过对生产装置进行改进,选择合理的工艺,提高了实际生产中工件改良率。     

持续改进——是质量体系有效运行的检验标准

通过对持续改进在ISO9000的理解,提高了持续改进在质量管理体系运行中重要性的认识,它足质量管理体系有效运行的精髓,是质量体系是否有效运行的检验标准,指出了企业如何在质量管理体系中运行中肝展持续改进。     

组合式半轴法兰摆辗模具设计

就半轴法兰摆辗模具中存在的问题,对原摆辗模具进行了改进设计,并对模具材料进行了改进,使模具适合在冲击载荷很大的环境下使用。对改进的模具结构和模具材料进行了实际生产验证,表明改进后的模具凸模更换方便,易于操作,在模具需要返修或者报废时,减少模具更换模块,模具返修次数减少,而且易于加工,降低了模具成本。     

基于DV-Hop的无线传感器网络定位算法

针对无线传感器网络中DV-Hop经典算法定位精度低的不足,提出了一种改DV-Hop定位算法;改进后的算法对锚节点的选取进行了优化,并改进节点跳数,还采用平均计算方法计算节点平均每跳距离。仿真表明,改进的DV-Hop算法对未知节点的定位精度有显著提高。     

基于k-均值的文本聚类算法及改进

本文提出了k-means聚类算法中选取初始聚类中心及处理孤立点的新方法,改进了k-means算法对初始聚类中心和孤立点文本很敏感的不足之处,并将改进后的算法应用于中文文本聚类中。实验结果表明,改进的算法较原算法在准确率上有较大提高,并且具有更好的稳定性。     

纺织厂空调测试分析及改进措施

本文主要结合山东某纺织厂空调系统的测试结果,分析了原有空调系统存在的问题。结合测试数据对测试方案提出改进性建议;通过对测试结果的分析指出其车间温湿度达不到生产工艺要求的原因。在此基础上提出了对该空调系统的改进方案,论述了改进方案中采用蒸发冷却技术在该空调系统的优势以及其适用性。     

基于动力总成三点悬置的改进TPA方法应用研究

针对传统TPA方法存在的测试时间长、传递函数估计精度低等问题,在对传统TPA方法分析的基础上,提出一种基于新型传递函数估计的改进TPA方法,采用改进TPA方法对动力总成三点悬置进行了实车分析和仿真试验。新型传递函数估计方法消除了实测信号中随机噪声影响,提高了估计精度;改进TPA方法省略了车身阻抗测量环节,缩短了测试时间;仿真试验结果证明了改进TPA方法应用于动力总成三点悬置的可行性。     

FX型叶片就地风选系统的节能型改进方法

为剔除松散回潮筒后的烟饼结块,降低就地风选系统的能源损耗,对选用的叶片就地风选系统进行了技术改进,详细介绍了对风选箱体、除杂箱体及风力分布的改进措施。改进后叶片中梗条、烟饼结块、金属等异物被大量剔除,同时除尘风量减少50％,实现了节能减排的预期目标。     

锅炉麻石水膜除尘器的缺陷与改进

本文对锅炉麻石水膜除尘器在运行中出现的问题及改进措施进行了分析，提出了对其关键部位改进的技术要点。     

Ni,Fe对Al90TM5Ce5非晶合金稳定性的影响

本文研究了Al90 Fe5Ce5和A190 Ni5Ce5非晶合金及预峰在晶化过程和时效过程中的稳定性。Al90Fe5Ce5非晶合金的晶化开始温度TX 和时效稳定性比Al90 Ni5Ce5非晶合金高。Al90 Fe5Ce5非晶合金预峰所对应的化学短程序结构的稳定性较高 ,而Al90 Ni5Ce5非晶合金预峰所对应的化学短程序结构的稳定性差 ,甚至通过常温时效消失。非晶合金的稳定性与预峰所对应的化学短程序结构的稳定性有密切关系     

Cavitation Erosion Corrosion Behaviour of Manganese-nickel-aluminum Bronze in Comparison with Manganese-brass

The cavitation erosion corrosion behaviour of ZQMn12-8-3-2 manganese-nickel-aluminum bronze and ZHMn55-3-1 manganese-brass was investigated by mass loss, electrochemical measurements (polarization curves and electrochemical impedance spectroscopy) and the cavitation damaged surfaces were observed by scanning electron microscopy (SEM). The results showed that ZQMn12-8-3-2 had better cavitation erosion resistance than ZHMn55-3-1. After the cavitation erosion for 6 h, the cumulative mass loss of ZQMn12-8-3-2 w...     

镍铝青铜BAl7-7-2-2合金摩擦磨损性能分析

分析了镍铝青铜BAl7-7-2-2合金及其热处理后的金相组织、硬度、拉伸性能、冲击韧性和摩擦磨损性能。结果表明,镍铝青铜BAl7-7-2-2合金经热处理后,组织发生再结晶细化,κ相析出减少,强度、硬度降低,冲击性能显著提高;BAl7-7-2-2合金摩擦系数低于QAl9-4合金的,热处理后摩擦系数继续减小,减摩性能优异;BAl7-7-2-2合金的磨损率高于QAl9-4合金的,热处理后磨损率降低,磨痕宽度和深度减小,耐磨性得到提高,接近QAl9-4合金的水平。     

厚膜永磁阵列微致动器的磁路研究

研究了厚膜永磁阵列微致动器中的磁场分布，并研究了永磁阵列单元几何尺寸对微致动器电磁力的影响。结果表明，厚膜永磁阵列单元高宽比和磁体单元间隔对微致动器电磁力影响较大磁徕单元高宽比为0．7是一个比较合适的尺寸。     

C6A4MS与C11A7.CaF2的共存与转化关系研究

本文详细研究了C6 A4 MS与C11 A7.CaF2的共存与转化条件。结果表明：C11 A7.CaF2含量较高时能够抑制C6 A4 MS的形成，含量较低时则能与C6 A4 MS共存；升高温度能够消除C11 A7.CaF2对C6 A4 MS的形成的影响；C11 A7.CaF2能与合成矿物C6 A4 MS共存。，The coexistence and transformation condition between C6 A4 MS and C11 A7 . CaF2 is studied in detail in this paper. The results shows that C11 A7 . CaF2 can restrain the formation of C6 A4 MS when in higher content, but It can coexist with C6 A4 MS when its concentration is lower. Increasing temperature can avoid the effect of C11 A7 . CaF2 on the formation of C6 A4 MS. C11 A7 . CaF2 can coexist with syntheitical mineral C6 A4 MS.     

纳米颗粒分散方法对电刷镀复合镀层组织及性能的影响

为了解决镀液中纳米颗粒的团聚问题,采用高能机械化学法对纳米颗粒进行了分散,在扫描电镜、显微硬度计、球-盘式磨损试验机上对比考察了机械搅拌法和高能机械化学分散法对电刷镀液中纳米颗粒分布和复合镀层组织、显微硬度及含磨料油润滑条件下磨损性能的影响.结果表明,高能机械化学分散法较好地解决了纳米颗粒分散的难题,与机械搅拌法相比,高能机械化学分散法制备的电刷镀液中纳米颗粒分散均匀、团聚少、稳定悬浮时间长,复合镀层中纳米颗粒含量高,镀层组织细小、致密,显微硬度高,含磨料油润滑条件下的耐磨性能好.     

Measurements of indoor gamma radiation dose in At-Taif city, Saudi Arabia using CaSO4:Dy (TLD-900)

This paper describes measurements of indoor gamma radiation dose in At-Taif city, Kingdom of Saudi Arabia. CaSO(4):Dy thermoluminescence dosemeters were used for the detection of gamma radiation in 250 houses within the city. The values of indoor gamma radiation dose rate measured ranged between 90 and 221 nGy h(-1) for the time interval from September 2002 to September 2003. The measured dose varied with the type of house and season of the year. The highest average value 192 +/- 7 nGy h(-1) was measured inside apartments made of cement and brick (157-221 nGy h(-1)), and the lowest average value 92 +/- 6 nGy h(-1) in mud houses (58-117 nGy h(-1)). Intermediate values 154 +/- 5 nGy h(-1) (128-177 nGy h(-1)) and 167 +/- 9 nGy h(-1) (144-185 nGy h(-1)) were observed in large halls and villas, respectively. The average indoor gamma radiation dose rate received by the population of At-Taif city is 138 nGy h(-1) and its corresponding annual dose is 1211 muGy y(-1). The calculated mean effective dose to At-Taif city population, assuming an indoor occupancy factor of 80%, is 970 muSv y(-1).     

Sorption potential of rice husk for the removal of 2,4-dichlorophenol from aqueous solutions: kinetic and thermodynamic investigations

The sorption potential of chemically and thermally treated rice husk (RHT) for the removal of 2,4-dichlorophenol (DCP) from aqueous solutions has been investigated. Sorption of DCP by rice husk was observed over a wide pH range of 1-10. The effect of contact time between liquid and solid phases, sorbent dose, pH, concentration of sorbate and temperature on the sorption of DCP onto rice husk has been studied. The pore area and average pore diameter of RHT by BET method are calculated to be 17+/-0.6 m2g-1 and 51.3+/-1.5 nm, respectively. Maximum sorption (98+/-1.2%) was achieved for RHT from 6.1x10(-5) moldm(-3) of sorbate solution using 0.1g of rice husk for 10 min agitation time at pH 6 and 303K, which is comparable to activated carbon commercial (ACC) 96.6+/-1.2%, but significantly higher than chemically treated rice husk (RHCT) 65+/-1.6% and rice husk untreated (RHUT) 41+/-2.3%. The sorption data obtained at optimized conditions was subjected to Freundlich, Langmuir and Dubinin-Radushkevich (D-R) isotherms. Sorption intensity 1/n (0.31+/-0.01) and sorption capacity multilayer C(m) (12.0+/-1.6 mmolg(-1)) have been evaluated using Freundlich sorption isotherm, whereas the values of sorption capacity monolayer Q (0.96+/-0.03 mmolg(-1)) and binding energy, b, (4.5+/-1.0)x10(4)dm(3)mol(-1) have been estimated by Langmuir isotherm. The Langmuir constant, b, was also used to calculate the dimensionless factor, R(L), in the concentration range (0.6-6.1)x10(-4) moldm(-3), suggesting greater sorption at low concentration. D-R sorption isotherm was employed to calculate sorption capacity X(m) (2.5+/-0.07 mmolg(-1)) and sorption energy E (14.7+/-0.13 kJmol(-1)). Lagergren and Morris-Weber equations were employed to study kinetics of sorption process using 0.2g of RHT, 25 cm(3) of 0.61x10(-4)moldm(-3) sorbate concentration at pH 6, giving values of first-order rate constant, k, and rate constant of intraparticle transport, R(id), (0.48+/-0.04 min(-1) and 6.8+/-0.8 nmolg(-1)min(-1/2), respectively) at 0.61x10(-4)moldm(-3) solution concentration of DCP, 0.1g RHT, pH 6 and 2-10min of agitation time. For thermodynamic studies, sorption potential was examined over temperature range 283-323 K by employing 6.1x10(-4)moldm(-3) solution concentration of DCP, 0.1g RHT at pH 6 and 10 min of agitation time and values of DeltaH (-25+/-1 kJmol(-1)), DeltaS (-61+/-4 Jmol(-1)K(-1)) and DeltaG(303K) (-7.1+/-0.09 kJmol(-1)) were computed. The negative values of enthalpy, entropy, and free energy suggest that the sorption is exothermic, stable, and spontaneous in nature.     

Oxidation of chlorinated ethenes by potassium permanganate: a kinetics study

The kinetics of oxidation of perchloroethylene (PCE), trichloroethylene (TCE), three isomers of dichloroethylene (DCE) and vinyl chloride (VC) by potassium permanganate (KMnO(4)) were studied in phosphate-buffered solutions of pH 7 and ionic strength approximately 0.05 M and under isothermal, completely mixed and zero headspace conditions. Experimental results have shown that the reaction appears to be second order overall and first order individually with respect to both KMnO(4) and all chlorinated ethenes (CEs), except VC. The degradation of VC by KMnO(4) is a two-consecutive-step process. The second step, being the rate-limiting step, is of first order in VC and has an activation energy (E(a)) of 7.9+/-1 kcal mol(-1). The second order rate constants at 20 degrees C are 0.035+/-0.004 M(-1) s(-1) (PCE), 0.80+/-0.12 M(-1) s(-1) (TCE), 1.52+/-0.05 M(-1) s(-1) (cis-DCE), 2.1+/-0.2 M(-1) s(-1) (1,1-DCE) and 48.6+/-0.9 M(-1) s(-1) (trans-DCE). The E(a) and entropy (DeltaS(*)) of the reaction between KMnO(4) and CEs (except VC) are in the range of 5.8-9.3 kcal mol(-1) and -33 to -36 kcal mol(-1) K(-1), respectively. Moreover, KMnO(4) is able to completely dechlorinate CEs, and the increase in acidity of the solution due to CE oxidation by KMnO(4) is directly proportional to the number of chlorine atoms in CEs.     

Comparison of adsorption equilibrium models for the study of CL-, NO3- and SO4(2-) removal from aqueous solutions by an anion exchange resin

The removal of chloride, nitrate and sulfate ions from aqueous solutions by a macroporous resin is studied through the ion exchange systems OH(-)/Cl(-), OH(-)/NO(3)(-), OH(-)/SO(4)(2-), and HCO(3)(-)/Cl(-), Cl(-)/NO(3)(-), Cl(-)/SO(4)(2-). They are investigated by means of Langmuir, Freundlich, Dubinin-Radushkevitch (D-R) and Dubinin-Astakhov (D-A) single-component adsorption isotherms. The sorption parameters and the fitting of the models are determined by nonlinear regression and discussed. The Langmuir model provides a fair estimation of the sorption capacity whatever the system under study, on the contrary to Freundlich and D-R models. The adsorption energies deduced from Dubinin and Langmuir isotherms are in good agreement, and the surface parameter of the D-A isotherm appears consistent. All models agree on the order of affinity OH(-)相似文献