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现代铝工业技术的发展都要求使用砂状氧化铝,粒度是衡量砂状氧化铝最主要的指标,本文对筛分法和激光粒度仪法粒度测定的原理和特点进行了对比分析,探讨了激光粒度仪使用中样品的处置问题,确定了用激光粒度仪测定砂状氧化铝粒度的方法。方法简单,快速,准确,既保证了和筛分法的衔接,又较好地解决了筛分法的缺点和不足。 相似文献
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随着对砂状氧化铝需求的增加,氢氧化铝的粒度测定越来越重要。本文从激光粒度仪的原理出发,探讨了测定氢氧化铝粒度分布的各种条件和参数,着重研究了其定形修正的功能,确定了激光粒度仪测定氢氧化铝粒度分布的方法。方法较好地克服了干筛法和电敏区法的缺点和局限。为国内准确、快速测定氢氧化铝粒度分布的方法填补了一项空白。 相似文献
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唐仕祥 《金属材料与冶金工程》1997,(4):45-46,55
进行了火法工艺制备各粒度级三氧化二锑系列产品的粒度控制试验,结果表明,只要严格控制过程中影响产品粒度的主要因素,并在自热式锑白炉上作些改进,完全可生产出各粒度级的三氧化二锑系列产品。 相似文献
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孙秀 《稀有金属与硬质合金》1991,(3):27-32
本文通过用英国MK_3圆盘离心沉降仪对43个细钨粉粒度和粒度分布定的研究,确定了离心沉降法测定细钨粉粒度及其分布的最佳测试条件。本文还对分散方法、沉降介质浓度、缓冲线起动等测试条件进行了讨论。并用光扫描比浊法、显微镜法、空气透过法和多功能图象分析仪进行了对比试验。从而确认离心沉降法是目前用来测定超细粉末粒度和粒度分布的简便而又科学的方法。 相似文献
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本文着重介绍美国Leeds&Northrupt公司研制的7995—12型标准范围粒度分析仪(Model7995—12Standard range particle size analyzer)。它可以方便地测试300微米(0.3毫米)以下的各种样品的粒度,如矿浆、水煤浆、牛奶、面粉、细砂等等。借助打印机可以准确地打印出所测试样品在300微米以下的各个不同粒级围范内的粒度分布率及平均颗粒直径,而且每次测试的结果准确性高,重复性好,而且该粒度分析仪还可以把每次测试结果回归出粒度特性曲线,供测试样品粒度的技术人员研究,是八十年代比较先进的微细粒度分析仪器。 相似文献
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描述了在运动状态下,用粒度显示器视频计算机系统(TBKC粒度计完善方案)进行球团矿粒度组成的无接触测量。在原料造球管理实验算法的基础上,按照粗糙度指标,显示了对于圆盘造球机球团分离区自动化系统应用的前景。 相似文献
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用激光粒度仪测试锌粉粒度的条件试验 总被引:1,自引:0,他引:1
金属锌粉粒度的准确测定直接关系到锌粉的性能.本文研究了试样质量浓度,超声分散时间和分散剂的加入对锌粉粒度测定结果的影响.结果表明:试样质量浓度的低或高,使粒度测试结果偏小或偏大;超声分散明显的有利于粒子的分散,有利于粒度的准确测定;分散剂的加入,能很好的提高测试结果的重现性. 相似文献
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Evidence indicates that both perceived size S' and retinal size Θ are involved in both the relative and familiar size cue to relative depth. There is also evidence to indicate that the familiar size cue cannot be subsumed under the relative size cue. But both types of size cues can be included under the concept of perceived size per unit of retinal size (S'/Θ). It is asserted that the perceived depth between objects, as determined by the size cue, is a function of the value of S'/Θ associated with each of the objects. Evidence relevant to specifying the relation between values of S'/Θ and perceived depth is evaluated with respect to methodological problems involved in the use of comparison fields. (21 ref.) (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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以造粒粒度分布为研究对象,通过原料粒度及粒度分布、水分质量分数对造粒粒度分布影响的实验室研究,改进和优化烧结生产工艺,提出一套合理的烧结生产控制模型,以实现烧结生产的自动化控制和造粒粒度分布的预测。研究结果:在适宜的造粒水分范围内,随水分质量分数的增加,造粒粒度增加;但当水分质量分数过大时,造粒粒度反而减小。原料粒度对造粒粒度的影响是主要因素,而水分质量分数对造粒粒度的影响是次要因素。由造粒粒度分布数学模型得出的预测值与试验值之间有较好的一致性,原料粒度分布为正态分布时造粒粒度分布也为正态分布,并且造粒粒度分布的质量概率密度函数可由原料粒度分布的质量概率密度函数和原料粒度分割系数确定。 相似文献
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在选矿工业中,粒度无疑是选矿作业较为重要的指标,粒度的测定也就显得尤为重要。粒度仪是用一定的自动控制方法测试固体颗粒的大小和分布的一种仪器,文章主要是对矿浆样品的指标进行化验分析,得出DFPSM超声波粒度仪在选矿作业中的准确性,并对其与粒度大小、料流稳定的关系做进一步分析。 相似文献
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Peters (1993) claimed that published research on brain size and IQ is flawed because it did not meet his list of "minimum conditions" that (a) subjects should be matched for height, weight and age, (b) analyses should be conducted separately within sex, (c) subjects should not vary in prenatal and nutritional history, (d) people with IQs appreciably below the population mean of 100 should not be studied, and (e) brain size measures should be done "blind". However, these "conditions" have either been met or are unnecessary and/or inappropriate. We show, contrary to Peters' claims, that (a) brain size is related to mental abilities, (b) brain size varies by sex and race, and (c) mental abilities vary by sex and race. Finally, we suggest that brain size constraints on behavioural complexity may be best understood from an evolutionary perspective. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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This study tested whether 4-month-old infants respond primarily to objects' physical or retinal image sizes. In the study's main experiment, infants were habituated to either a 6-cm-diameter disk at a distance of 18 cm or a 10-cm disk at 50 cm. They were then given 2 test trials in which the 6- and 10-cm disks were presented side by side at a distance of 30 cm. For each infant, one test object had a novel physical size but a familiar retinal image size, and the other had a familiar physical size but a novel retinal image size. The infants exhibited a significant looking preference for the object that had a novel physical size. A preliminary experiment found that 4-month-olds' looking preferences are based on novelty, not familiarity, under the conditions of this study. Given this finding, the results suggest that 4-month-old infants attend and respond primarily to physical size, not to retinal image size. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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稀土草酸盐的溶解度与稀土氧化物粒度之间的关系及粒度控制 总被引:8,自引:1,他引:7
通过稀土草酸盐溶液度与粒度的关系。探索控制稀土氧化物粒度的途径。实验测定了几种稀土草酸盐在草酸沉淀母液中的溶解度,并对不同草酸沉淀条件下获得的单一稀土氧化物的粒度进行比较。得到了其氧化物粒度与草酸盐溶解度之间的关系,通过对Y2O3,Eu2O3,Gd2O3,Dy2O3的粒度数据进行分析对照,提出了控制其粒度的途径。 相似文献
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Macdorman Carroll F.; Rivoire Jeanne L.; Gallagher Peter J.; MacDorman Claudia F. 《Canadian Metallurgical Quarterly》1964,69(3):258
In a size-constancy task 10 schizophrenic and 10 normal adolescent males judged variable triangles as smaller, same size, or larger than a standard. The schizophrenics' judgments were further from constancy, and differed qualitatively. They made more (a) same-size judgments, (b) changes of judgments, (c) overestimation of the size of the standard, and (d) improvement with practice. The relative constancy of the same-size judgments of most Ss suggested the effects of personality variables. A significant correlation was found between constancy performance and the Sc score on the MMPI for the experimental group. The direction of error, underconstancy or overconstancy, was determined by the space arrangement of the variable and the standard. Both groups responded similarly to the experimental conditions of distance, series order, and space arrangement. (22 ref.) (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献