共查询到19条相似文献,搜索用时 125 毫秒
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用矿化垃圾作为水生植物床的基质代替基质中土壤的作用,分别选择水葫芦和空心莲子草作为水生植物床的植物,制成了人工水生植物床,来尝试处理染料水溶液制成的模拟印染废水,并对比了染料在自然条件下的降解。 相似文献
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用矿化垃圾作为水生植物床的基质代替基质中土壤的作用,分别选择水葫芦和空心莲子草作为水生植物床的植物,制成了人工水生植物床,来尝试处理染料水溶液制成的模拟印染废水,并对比了染料在自然条件下的降解. 相似文献
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通过对组成打结料成分特性的研究,提出以优质原料生产的MgO-CaO-Fe2O3系合成砂为骨料,用MgO〉97%,粒度〈0.088mm烧结镁砂做细粉,适当添加超微粉等工艺措施,制成适当高碳铬铁电炉炉底用的高基质打结料,通过调控基质成分,实现材料相和固相的复合烧结。 相似文献
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燃料电池及其相关材料新进展(二) 总被引:4,自引:1,他引:3
34基质基质是通过毛细作用吸附磷酸而使电极保持电隔离的电池组件,由掺入适量PTFE作粘结剂(质量分数约30%~50%)的细而纯的SiC粉制成。典型厚度为18mm,每平方米可吸附15kg电解质。如用聚苯并咪唑(PBT)代替PTFE,基质中磷酸的吸... 相似文献
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本文介绍了铝阳极氧化膜的染色机理和Megafix BES染料的染色性能,对Mgeafix BES染料染色工艺条件进行了探讨,推荐了Megafix BES染料染色实用工艺,为金属铝染色拓宽了染料应用范围,且色谱齐全,得色深浓,色泽鲜艳,性能优越。 相似文献
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结合国内外水体富营养化的研究现状,分析了水生植物的重要生态功能和生态地位,归纳了浅水湖泊水生植物生态修复和水华水体水生植物生态治理相关技术,并展望了今后的治理思路. 相似文献
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综述了国内外水生植物净化作用研究领域的主要成果,对水生植物在治理富营养化水体方面的发展方向作了展望. 相似文献
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FH Wittkampf H Nakagawa WS Yamanashi S Imai WM Jackman 《Canadian Metallurgical Quarterly》1996,93(6):1083-1086
The relative nail producing capacity of different regions within the nail matrix has not been quantified. In order to do this, the number of nail plate cells in the dorsoventral axis of 12 human great toenails was counted at five sites in the longitudinal axis, and compared with direct measurements of nail plate thickness at the same sites. The mean number of nail cells in the nail plate reached a maximum at the lunula, with no further increase along the length of the nail bed. At the mid-point between the proximal tip of the germinal matrix and lunula, mean cell numbers achieved 81% of the value at the lunula. Mean nail thickness was only 90% of its maximum at the lunula, with a further significant increase (P = 0.02) between the lunula and end of the nail bed. These observations suggest that the proximal nail matrix is the main source of nail within the matrix. This is consistent with clinical experience where distal matrix surgery has a low potential for scarring in comparison with proximal matrix surgery. The additional finding of increased nail thickness, but not cell numbers, along the nail bed make it likely that cells within the nail plate change shape as they move distally. 相似文献
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印染废水是一种成分复杂、处理难度大、毒性高的工业废水,对环境危害极大.针对印染废水选择了合适的预处理方式,并建立一种微电解-JS试剂法处理印染废水的工艺.印染废水首先通过酸化絮凝预处理,再利用自制高活性微电解填料协同自行开发的JS试剂处理,最后通过加入石灰调节pH值为9,并进行混凝沉淀,废水色度基本脱除,COD含量降至... 相似文献
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The beta-galactoside-binding proteins galectin-1 and -3 are thought to modulate cell-extracellular matrix interactions in cell adhesion and migration. In this study, their occurrence in human trophoblast has been investigated. In the first trimester placenta galectin-1 is expressed in the cytotrophoblast of the mid and distal cell columns, but absent from the villous and proximal column cytotrophoblast. The villous syncytiotrophoblast was also positive. Galectin-3, on the other hand, was uniformly localized in the villous cytotrophoblast and mid and distal cell columns. Immunolocalization of these proteins in placental bed tissue has shown that galectin-1 and -3 are not present in cytokeratin-positive interstitially migrating cytotrophoblast. The co-localization of galectin-1 with extracellular laminin in cultures of cytotrophoblast, choriocarcinoma or decidual stromal cells is consistent with a role in the organization of extracellular matrix and the regulation of cell motility. 相似文献
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An important issue of concern for drug analysis in hair is the change in the drug concentration induced by the cosmetic treatment of hair. The products used for this treatment are strong bases and they are expected to cause hair damage. As a result drugs may be lost from the hair matrix or, under conditions of environmental contamination, be more easily incorporated into the hair matrix. We investigated the effects of cosmetic treatment in vivo by analysing hair samples selected from people who had treated their hair by bleaching or dyeing before sample collection. All of the subjects admitted a similar drug consumption during the time period for which the strands were analysed. Samples were viewed under a microscope to establish the degree of hair damage. Treated and untreated portions from each lock of hair were then selected, separated and analysed by standard detection procedures for cocaine, opiates, cannabinoids and nicotine. In all cases the drug content in hair that had undergone cosmetic treatment decreased in comparison to untreated hair. The majority of the mean differences were in the range of 40%-60% (cocaine, benzoylecgonine, codeine, 6-acetylmorphine and THC-COOH). For morphine the mean difference was higher than 60%, and two cases (THC and nicotine) differed by approx. 30%. These differences depended not only on the type of cosmetic treatment, as bleaching produced higher decreases than dyeing, but also on the degree of hair damage i.e. the more damaged the hair, the larger the differences in the concentration levels of drugs. 相似文献
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Effects of rapid heat transfer using a fluidized bed on the heat-treating response of Al-Si-Mg alloys (both unmodified and
Sr modified) were investigated. The heating rate in the fluidized bed is greater than in conventional air convective furnaces.
Particle size analyses of eutectic Si showed that the high heating rate during fluidized bed solution heat treatment causes
faster fragmentation and spherodization of Si particles compared to conventional air convective furnaces. The mechanism of
Si fragmentation through fluidized bed processing is through both brittle fracture and neck formation and its propagation.
In contrast to this, the mechanism of Si fragmentation using a conventional air convective furnace is through neck formation
and propagation. The Sr-modified D357 alloy showed a faster spherodizing rate than the unmodified alloy. Thermal analyses
showed an exothermic reaction during solution heat treatment using a fluidized bed due to recrystallization, and coarsening
of eutectic Al grains. Whereas the alloy solutionized using a conventional air convective furnace showed two exothermic reactions,
one due to annihilation of point defects and the other due to recrystallization, and coarsening of the eutectic grains in
the aluminum matrix. The recrystallization temperature of the alloy solutionized in the fluidized bed is lower than those
in the conventional air convective furnace. Both tensile strength and elongation of fluidized bed solutionized alloys are
greater than those solutionized using the air convective furnace. The optimum heat-treatment time for T4 temper using a fluidized
bed for unmodified and Sr-modified alloy was reduced to 60 and 30 minutes, respectively. 相似文献
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Decrements in muscle strength as a result of prolonged bed rest are well defined, but little is known about potential countermeasures for preventing loss of strength under this condition. The purpose of this study was to determine whether testosterone administration would preserve protein balance and muscle strength during prolonged bed rest. Ten healthy men (age, 36 +/- 2 yr; height, 177.2 +/- 3.4 cm; weight, 80.5 +/- 3.9 kg; mean +/- SE) were admitted to our in-patient metabolic unit. After a 1-week ambulatory run-in period, each subject was confined to bed for 28 days at 6 degree head-down tilt while receiving a daily oral dose of T3 (50 microg/day). During the bed rest/T3 period, six of the men were randomized to receive testosterone enanthate by i.m. injection (T; 200 mg/week) while four received placebo in a double blind fashion. Nitrogen balance was determined throughout, and whole body [13C]leucine kinetics were assessed at baseline and on day 26 of bed rest. Before bed rest and on the third day of reambulation, the muscle strength of the knee extensors and flexors and shoulder extensors and flexors was determined at 60 degrees/s on a Cybex isokinetic dynamometer. Despite improved [13C]leucine kinetics and maintenance of nitrogen balance and lean body mass in T-treated subjects, little preservation of muscle strength, particularly in the knee extensors, was noted. Muscle strength [reported as the best work repetition in foot-pounds (FtLb)] for right knee extensors declined (P = 0.011) similarly in both groups; from 165 +/- 15 to 126 +/- 18 FtLb in T-treated men and from 179 +/- 22 to 149 +/- 13 FtLb in placebo-treated men. Overall, there was less of a decline in extension and flexion strength of the shoulder compared to the knee, with no benefit from T. These results suggest that in the absence of daily ambulatory activity, T administration will not increase or, in the case of this bed rest model, preserve muscle strength. 相似文献