超精密加工中刀具形状对加工质量的影响

以举例和推导的形式讨论了超精密加工中刀具形状对加工质量的影响，以及如何正确的选择刀具参数。     

Initial effects of lime and rock powder application on soil solution chemistry in a dystric cambisol – results of model experiments

The initial effects of practical orientated lime and rock powder treatments on soil solution chemistry of a dystric cambisol are assessed by percolation experiments with undisturbed soil cores. During percolation coarse macropores remained air filled (water suction 10–60 hPa). This method may be seen as a `pedological tissue test' where in a time-lapse-experiment effects and side effects of forest fertilizations are monitored by analyzing the macropore water flux with high spatial resolution. Lime application caused a DOC-mobilization in the Ah horizon and an additional nitrification in the Bv horizon. The DOC formation is triggered by the need to replace unstable bicarbonate anions when the pH of the macropore water decreases drastically. The lime induced DOC output from the Ah horizon is a potential energy source for heterotrophic nitrifiers in the Bv horizon and may explain the additional nitrate formation. Rock powder addition caused mainly an increased K-flux into the mineral soil and showed no significant side effects. However, benefits comparable to liming can only be obtained, if rock powder is applied in 3–4 times higher dosages.     

持续、有效地推动企业的质量改进

本文介绍了质量改进的三个过程(识别影响质量改进的因素、产品的质量改进、企业管理系统的质量改进)及其相应的解决方法.     

农村电网改造经济效益初步分析

对广东省实施农村电网改造以来投入和产出的效益进行了分析。为此,阐述了农村电网改造经济效益的构成,同时给出了计算方法,并对珠江三角洲和周边欠发达地区某农电单位的投资收益进行了具体分析。     

谈葡萄酒酿造的几项基本原则

葡萄酒应该充分体现葡萄原料的特点，新技术的介入是为了提升葡萄酒的价值，而不能改变其本来面目。葡萄的质量是葡萄酒质量的根本保证，葡萄的品种、成熟度与酒种密切相关；葡萄酒的病害以预防为主；对原料的改良无法达到正常成熟的葡萄所具有的质量；对葡萄汁进行处理要优于对酒进行处理；对葡萄酒的任何处理都是以牺牲酒的质量作为代价的。     

膨胀土地基的综合改良法处理试验研究

对不同起始含水率、掺入石灰率以及击实功试验条件下的大试件膨胀率进行了分析,得出了膨胀率与起始含水率为对数关系曲线,膨胀率与掺入石灰率、击实功为不同的幂函数关系曲线,研究结果为膨胀土地基的设计及膨胀土地基处理等膨胀土问题提供了重要的依据。     

金针菇菌糠啤酒糟有机肥对土壤及马铃薯品质的影响

目的研究金针菇菌糠啤酒渣有机肥对种植后土壤的改良作用及对马铃薯产量、品质的影响。方法采用条垛式发酵生产金针菇菌糠有机肥。设计金针菇菌糠有机肥、普通化肥、有机肥及空白(不施肥)等4个实验组,在其他条件相同下种植马铃薯,检测种植马铃薯前后的土壤状况,测定种植后的马铃薯产量及品质状况。结果金针菇菌糠啤酒渣有机肥能显著提升土壤p H值、土壤阳离子交换量、土壤中有机质、碱解N、有效P、速效K、全N、全P和马铃薯总糖、总酚及总产量,且能显著降低土壤的电导率,但对种植的马铃薯的水分、灰分、蛋白质的含量影响较小。结论金针菇菌糠具有改良土壤酸化、土壤性能、降低土壤次生盐渍化风险、提升土壤缓冲性能和提高马铃薯总产量的作用。     

土压平衡盾构全断面砂层施工关键技术

砂层中细颗粒成分少,砂层具有黏聚力小、内摩擦角大、渗透系数大、稳定性差以及密度大等特点,土压平衡盾构在全断面砂层掘进时存在掘进参数不协调、土压平衡掘进模式难以建立、设备磨损严重以及沉降难以控制等技术问题,分析认为,砂层的物理力学性质是盾构掘进困难的主因,采用工程试验、理论分析和实践应用相结合的方法,对注入膨润土泥浆为主、辅以注入泡沫进行碴土改良和沉降控制等施工关键技术进行了研究和工程实践,取得了较好的效果,并对施工经验进行了总结.     

Amelioration of smoke taint in wine by treatment with commercial fining agents

Background and Aims: Fermentation of smoke‐affected grapes can lead to wines that exhibit objectionable smoke‐related sensory attributes, i.e. smoke taint. Fining agents are routinely used at different stages of the winemaking process to address constituents that are considered to adversely affect juice or wine quality. This study aimed to evaluate the efficacy of commercial fining agents in reducing the concentration of volatile phenols and the intensity of sensory attributes associated with smoke‐tainted wine. Methods and Results: Smoke‐affected wines were treated with a range of fining agents, two of which, an activated carbon and a synthetic mineral, were found to appreciably ameliorate the taint. Treated wines contained a significantly lower level of smoke‐derived volatile phenols and exhibited less intense ‘smoke’ and ‘cold ash’ aromas, ‘smoky’ flavour and ‘ashy’ aftertaste, compared with that of untreated (control) wines; with little or no impact on wine colour. Conclusions: Selected fining agents can ameliorate smoke taint in wine. Whereas most fining agents showed poor specificity towards the wine components responsible for smoke taint, some, an activated carbon in particular, were highly effective. Significance of the Study: This research identifies a treatment that can be used to mitigate the impact of grapevine exposure to smoke on wine composition and sensory properties.     

超滤系统的在线化学清洗

对榆次恒能热电有限公司超滤系统污堵产生的原因进行分析,针对其特点对超滤系统进行了化学清洗,清洗效果良好,为确保系统的安全稳定运行,并对该超滤系统的运行进行了改进与探讨。