浅谈如何做好能力验证中重金属铅、镉、铬的考核

能力验证是确保实验室维持较高的检测水平而对其能力进行考核、监督和确认的一种验证活动。介绍了如何做好重金属铅、镉、铬的考核项目,总结了几点工作体会。     

流动注射分析法测定挥发酚考核样探讨

运用流动注射分析法对地表水挥发酚国家能力验证考核样品进行测定,建立了地表水挥发酚样品测定的工作曲线,对质量控制样品、国家能力验证考核样品的测定结果的准确度和精密度进行分析,最后探讨了影响测定结果的因素。     

高精度酚醛亚麻织物薄垫板的研制

研制了一种用于飞机油箱外侧的超薄尺寸酚醛亚麻织物垫板。结果表明：所研制的垫板，具有耐磨、耐燃油、机械强度高等性能，且成型工艺可靠，材料性能优异；经客户装机考核验证，垫板功能稳定可靠，能够满足实际工况要求。     

铅、铬、汞、镉能力验证整改研究

实验室能力验证,是指是利用实验室间比对来确定实验室和检查机构从事特定测试活动的技术能力的活动。通过能力验证活动,不仅考核实验室人员的操作水平,而且还检查仪器的运行状态、标准物质的应用、实验过程、环境是否符合要求,是对实验室能力的综合性考核。现对实验室参加重金属能力验证中出现"有问题"的结果进行整改研究。     

中华人民共和国农业部公告第992号

为做好农药登记管理工作,进一步规范农药登记室内活性测定试验,保证农药登记评审的科学性和准确性,根据《农药管理条例实施办法》等有关规定,我部在全国范围内开展了农药登记室内活性验证试验单位资质考核工作。经考核和评审,批准中国农业大学农学与生物技术学院等37个单位为农药登记室内活性验证试验单位,有效期为五年。     

如何对采购进行考核

一说到考核，人们就会想到量化指标，想到SMART。这是一种误导，不论是否好量化，考核首先应该关注的是考核的导向。因为考核不是目的，管理才是目的，考核不过是管理的手段而已。采购考核也是这样，我们看到太多量化的考核指标让被考核者和考核者都无可奈何。也看到，严密的考核制度下，既不能提高业绩，也让管理成本大幅上升。     

道恩通过CNAS T0381塑料能力验证

日前,中国合格评定委员会与国家塑料制品质量监督检验中心（北京）公布了CNAST0381塑料拉伸性能测试能力验证结果。隶属于山东道恩集团公司的龙口市道恩工程塑料公司检测中心顺利通过验证。本次能力验证试验采用分割样品考核实验室存在的系统误差与实验室内的随机误差。在此次能力验证中,道恩工程塑料公司检测中心顺利通过了拉伸屈服应力、     

高职院校数控技术专业顶岗实习考核标准的研究与实践

在分析制定顶岗实习考核标准基本原则的基础上，结合数控技术专业的改革实践，通过评价指标以及各考核指标的考核标准确定，制定出高职院校学生校外顶岗实习考核标准，可为高职院校学生校外顶岗实习的考核提供参考。     

基础化学实验课程考核评价体系的研究与实践

科学的基础化学实验课程考核评价体系可以让基础化学实验课程教学水平得到提升,可以让学生化学实验操作能力得到提升。本文首先对基础化学实验课程教学现状作出阐述,然后对基础化学实验课程考核评价方法现存问题进行分析,针对问题的产生原因,提出一种基础化学实验课程考核评价体系的构建方法,并对其实践效果进行验证。     

基层队伍生产技术指标考核方式的探索与实践

针对"科学性、合理性、系统性"生产技术指标考核体系原则,综合考虑基层队伍的天然气产量指标、生产综合指标及工艺技术指标,建立了定量化指标评价标准表,尽可能保证指标选择的全面性和代表性。通过现场实际应用,验证了该考核方式的可行性和合理性。     

组分梯度复合对水泥基材料力学性能的影响

利用梯度结构的概念提出了水泥基梯度功能材料的结构模型，初步研究了界面组分梯度分布和纤维梯度分布对混凝土，纤维增强混凝土和纤维增强砂浆力学性能的影响。结果表明：采用不同配比的分层配料，振动成型的方法，可以基本保证组分呈梯度连续变化；界面组分的梯度变化可以明显改善界面粘结而提高强度；纤维的梯度变化更符合受力状态，与纤维均匀分布相比，可以明显提高强度，并可以节约纤维用量。显示了水泥基梯度功能材料良好的发展前景。     

铝盐混凝剂作用机理研究进展

铝盐混凝剂是目前水处理中广泛应用的无机混凝剂,作者概略了铝盐混凝剂在水处理中的作用机理研究进展,并对今后研究提出了建议。     

粘结剂含量对短炭纤维增强炭基复合材料性能的影响

本文以聚丙烯睛基炭纤维为增强材料，以石油焦为基体，配入不同含量的煤焦油沥青作为粘结剂，用热压法进行成型、炭化、石黑化，获得了短炭纤维增强炭基复合材料（SCFRC）对所得炭／炭复合材料进行了体积密度、显气孔率、抗弯强度、抗压强度的测定，并对炭／炭复合材料的断面进行了扫描电镜测试。研究表明，随着粘结剂量的增加，所得炭／炭复合材料的体积密度减小，显气孔率增大，抗弯强度和抗压强度增大。     

基于三坐标测量的产品自由曲面反求

通过分析产品自由曲面反求的技术,介绍了自由曲面数据的获取方法、CAD模型的重构技术,分析了自由曲面重构中存在的问题。以工艺品塑料树叶为例,详细介绍了基于三坐标测量的产品自由曲面反求技术,实践表明该建模方法可以得到实际生产中满意的曲面模型。     

SIMULATION OF THE EFFECT OF AIR VELOCITY IN THE DRYING OF HARDWOOD TIMBER

The effects of different air velocities on the drying of Australian hardwood timber have been investigated using a drying model based on Fickian diffusion. The air velocities studied were 0.05, 0.5, and 2 m.s^-1, corresponding to typical velocities covering the range used from pre-drying to normal kiln conditions. Decreasing tbe air velocity from 2 m.s^-1 to 0.05 m.s^-1 reduces the maximum strain experienced with an optimised drying schedule by 34%, although if the lower velocity is used throughout the drying period, the drying time is predicted to be 40% longer. Explorations with a program to optimise drying schedules suggest that there may Dot be any significant advantage in moving from a low air velocity of 0.05 m.s^-1 to a higher one (2 m.s^-1) in terms of reducing drying time, for the same maximum strain during drying, compared with using a constant air velocity of 0.5 m.s^-1.     

THE HEAT OF SORPTION OF TIMBER

ABSTRACT

Two different methods for calculating the heat of somtion of timber are compared. One method uses thermodynamic expieasions together with the sorption equilibrium relationship given by Simpson and Rosen (1981). while the other is based on the direct measurements made by Kelsev end Clarke (1956). The latter method is most reliable for moisture contents below 0.07 kg kg^-1, where the heat of sorption is significant cowered with the latent heat of vaporisstion of water.     

THE TIME CONSOLIDATION OF BULK SOLIDS ON THE EXAMPLE OF VISCOELASTIC GRANULES*

Many bulk solids of practical use consolidate with increasing storage time at rest. In the case of sticking EVA-copolymer particles a large number of experimental examinations were performed. The unconfined yield stress, the uniaxial tensile strength, and the adherent strength between two particles were analysed. The flattening of the particles due to the time consolidation at rest was measured microscopical. The time consolidation of EVA-copolymers in the considered range of temperature and storage time is based on the mechanism of viscoelastic flattening at the contact areas of the particles.     

INFLUENCE OF DRYING ON THE STORAGE ABILITY OF RICE BRAN

It is known that the rate of formation of free fatty acids in rice bran is dependant on the history of temperature and moisture content experienced by the bran since its formation. A mathematical model is already available to predict the rate of formation of free fatty acids in rice bran for heat treatment conditions. This paper attempts to apply the model for storage conditions in order to predict the storage ability of rice bran which has undergone varying drying conditions. Experimental results already available were found to be in agreement with the predicted theoretical values based on the model.     

膜生物反应器中污泥膨胀与生物泡沫的形成与控制研究进展

总结了近年膜生物反应器内丝状菌污泥膨胀和生物泡沫问题的研究现状,对二者的形成机理做了对比分析,讨论了丝状菌污泥膨胀和发泡的影响条件,并在此基础上提出了相应的控制技术.丝状菌的过度增殖是膜池内污泥膨胀和发泡问题的主要原因,研究丝状菌生长的影响条件,探索实际工程中控制其生长的技术措施,有利提高膜组件的使用寿命,降低膜生物反应器的运行成本.     

INFLUENCE OF DRYING ON THE STORAGE ABILITY OF RICE BRAN

It is known that the rate of formation of free fatty acids in rice bran is dependant on the history of temperature and moisture content experienced by the bran since its formation. A mathematical model is already available to predict the rate of formation of free fatty acids in rice bran for heat treatment conditions. This paper attempts to apply the model for storage conditions in order to predict the storage ability of rice bran which has undergone varying drying conditions. Experimental results already available were found to be in agreement with the predicted theoretical values based on the model.