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目的建立甘肃省渭源县健康成人静脉血红细胞(RBC)分析参数的参考范围。方法所有对象均来自本县体检的正常人群,男921名,女893名,以G.TECCA800自动血液分析仪作RBC参数检测后行统计学分析并与对照资料作对比。结果各项RBC参数的参考范围如下:RBC计数男性为4.66~6.45×1012/L,女性为3.91~5.64×1012/L;红细胞压积(HCT)男性为0.394~0.553,女性为0.336~0.474;血红蛋白(HGB)浓度男性为140.7~194.4g/L,女性为113.2~167.7g/L;红细胞平均血红蛋白含量(MCH)男性为26.82~33.52Pg,女性为25.06~33.80Pg;红细胞平均血红蛋白浓度(MCHC)男性为317.6~390.9g/L,女性为304.0~389.7g/L;红细胞平均体积(MCV)男性为76.5~93.9,女性为72.0~98.0。结论 RBC、HCT、HGB、MCH、MCHC和MCV的结果与对照资料相比有显著差异(P<0.01)。 相似文献
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硝磺草酮在玉米上的残留研究 总被引:2,自引:0,他引:2
研究了硝磺草酮在玉米植株、籽粒和土壤中的残留分析方法及残留动态。结果表明,硝磺草酮最小检出量为0.3ng,在植株、籽粒及土壤中的最低检测浓度分别为0.02mg/kg、0.01mg/kg和0.01mg/kg。硝磺草酮在植株中添加回收率为80.94%~89.0%,相对标准偏差为3.66%~12.54%;籽粒中添加回收率为78.11%~87.15%,相对标准偏差为3.95%~11.54%;土壤中添加回收率为81.27%~95.38%,相对标准偏差为4.25%~6.28%。植株中半衰期为5.6~6.8d,土壤中半衰期为10.4~10.8d。 相似文献
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开发了碱性无氰镀镉新工艺。镀液中含氯化镉25~35 g/L、配位剂90~140 g/L、氯化钾140~180 g/L、光亮剂1.5~2.5 mL/L和辅助剂25~35 mL/L,pH为7.5~8.5,温度20~35°C。对于挂镀,阴极电流密度为0.5~1.5 A/dm~2;对于滚镀,槽电压为5~10 V,滚筒转速为4~8 r/min。在1.0 A/dm~2下电镀,镉的沉积速率约为0.35μm/min。该工艺的电流效率为70%左右,均镀能力为43%~59%,深镀能力为8.3,热震结合力合格。镉镀层经过低铬彩色钝化后进行中性盐雾试验1 000 h,无白锈生成。弯曲测试结果表明,厚度为36μm左右的镉镀层也具有良好的柔软性。 相似文献
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以丙烯酸树脂为成膜基料,二氧化钛为颜料,纳米氧化锆、氧化铝为隔热填料制备了一种纳米隔热涂料.研究结果表明:在氧化锆的粒径为10~20 nm,氧化铝纤维的一维直径为10~20 nm,纳米氧化锆含量为6%~7%,纳米氧化铝为10%~15%,涂层厚度0.3~0.4 mm时,可以使被涂物内部降温幅度达到20~30℃. 相似文献
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以沉积速度和镀层中磷含量为评价指标,通过实验分别考察了硫酸镍质量浓度、硫酸镍与次磷酸钠的摩尔比、pH、温度及EDTA-2Na对化学镀镍-磷合金的影响。实验结果表明,当硫酸镍质量浓度为20~30g/L、n(硫酸镍)∶n(次磷酸钠)为0.25~0.40、络合剂总质量浓度为35g/L(其中EDTA-2Na为2.5~10.0 g/L),θ为86~90℃、pH为4.6~5.0时,沉积速度为11.87~14.00μm/h,镀层中w(磷)为10.2%~12.0%;镀层X-射线衍射图谱显示出非晶态结构所具有的典型"馒头峰"。 相似文献
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Coal ash from Candiota thermoelectric power plant in southern Brazil is a waste generated in great amount. Current estimates
indicate that coal ash production is likely to reach 2.000.000 tons per year. Of this total, only 10% are commercialized,
so the price of this material is very low. In this work, it was investigated the use of coal ashes in a composition of refractory
insulating brick. In coal combustion process, fly ashes and bottom ashes are generated. Bottom ashes are formed by partially
fused ashes that precipitate to the bottom of the boiler, due to their coarser particle size. Therefore, it was analyzed fly
ash addition in a refractory body and the addition of bottom ashes, partially replacing chamote (calcinated clay). The results
showed that the effect of the ash is small in the fired materials. In terms of technological characterization, the bricks
formulates with coal ash were considered suitable to commercial brick standards. Density and thermal conductivity of the refractory
bricks with coal ashes had revealed to be similar the commercial products. Then, the use of ash is economical attractive and
technical feasible.
Translated from Novye Ogneupory, No. 6, pp. 60–63, June 2008. 相似文献
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粉煤灰—漂珠保温砖的研制 总被引:6,自引:0,他引:6
通过传热机理分析,研究了粉煤灰掺量对保温砖导热系数的影响;并从粉煤灰的化学组成和物相结构出发,讨论了粉煤灰掺量与保温砖烧成温度间的关系。 相似文献
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L. C. Hewitt 《Journal of the American Ceramic Society》1926,9(9):575-582
Six types of refractory brick were tested with five types of coal ash, the cone fusion points of the brick-ash mixtures being determined over a range of 10% brick, 90% ash, to 40 % brick, 60% ash. A departure was made from previous methods in that high ash mixtures were studied rather than high brick mixtures, in the belief that boiler slags contain a relatively low proportion of the refractory. Sintered mixtures of refractory and ash tend to give higher fusion points than the raw mixtures do. Any determinations made in an uncontrolled atmosphere are exceedingly unreliable. The results obtained in this investigation indicate that the “cone-slag test” is of very limited value as a means of selecting refractories for boiler service. 相似文献
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针对当前城市垃圾焚烧飞灰(MSWI)处置费用高昂、环境污染严重等问题,提出一种利用微生物矿化原理制备免烧结垃圾焚烧飞灰砖的方法。通过在飞灰砖固结体中加入微生物菌液,利用微生物诱导碳酸盐沉积原理,实现飞灰中重金属的固化和稳定化。本文以垃圾焚烧飞灰、Ca(OH)2、砂子、微生物菌液为原材料,通过单因素试验,探究了制备微生物飞灰砖最优的飞灰掺量、菌液浓度、营养液中钙离子浓度。试验结果表明,当飞灰掺量为40%(质量分数),菌液OD600值为0.60,营养液中钙离子浓度为0.30 mol/L时,飞灰砖力学性能最优。此时规格为100 mm×100 mm×50 mm免烧结微生物飞灰砖的干密度为1 937.40 kg/m3,抗压强度达到33.90 MPa,并且重金属浸出浓度满足限值要求,实现垃圾焚烧飞灰的资源化利用。 相似文献
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In this paper the mineralogy and geochemistry of Greek and Chinese coal fly ash are examined. Annual production of fly ash in China is around 160 Mt while in Greece lignite fly ash accounts around 10 Mt. Even though the mineralogical and chemical composition of the fly ashes coming from these two countries differs, there are common questions on the utilization of this material. The variation of the Greek fly ash’ chemical composition, from Ca-poor to Ca-rich fly ash, has resulted to applications such as dam construction, use in cement and possibly in concrete and road construction. The Chinese fly ash, which is rich in mullite, is broadly applied for brick making. 相似文献
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利用室内试验方法制备了粉煤灰加气混凝土砌块和砌体,分别测试了混凝土砌块的抗拉抗压强度和砌体的抗拉和抗剪强度,分析了砌体抗压和抗剪强度随砂浆厚度的变化规律。在此基础上,建立了粉煤灰加气混凝土砌体节能效应的FLAC 3D数值计算模型。研究表明:(1)粉煤灰加气混凝土砌块的抗拉压强度平均值分别为4.53 MPa和0.75MPa;(2)粉煤灰加气混凝土砌体的整体抗压和抗剪强度随砂浆厚度的增大而分别减小和增大;(3)粉煤灰加气混凝土砌体的平均传热系数小于普通灰砂砖砌体,且随砂浆厚度的增大而减小。 相似文献
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以粉煤灰为功能填料、氢氧化镁\[Mg(OH)2\]为阻燃剂、甲基丙烯酸甲酯(MMA)为聚合单体、过氧化二苯甲酰(BPO)为引发剂,采用梯度温度本体聚合工艺制备了聚甲基丙烯酸甲酯(PMMA)/粉煤灰/Mg(OH)2复合材料,通过扫描电子显微镜测试了复合材料的微观形貌,并研究了其燃烧性能和隔热性能。研究发现,复合材料中Mg(OH)2添加量为35 份(质量份数,下同)时,阻燃级别为HB级;粉煤灰的添加量为60~80份时,复合材料制得的板材厚度≤20 mm时,隔热效果好。 相似文献