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为了研究碳气溶胶,包括有机碳与元素碳对陶质文物的表面腐蚀、彩绘脱失的影响,本文中于国庆黄金周期间(10月1~14日)对兵马俑博物馆一号坑(PitNo.1)和馆外(Outdoor)进行连续两周采集的碳气溶胶进行有机碳、元素碳组分的分析。结果表明:国庆黄金周期间(10月1~7日)馆内碳气溶胶明显高于馆外,有机碳与元素碳分别为馆外的2.3与1.6倍,馆内碳气溶胶占气溶胶组分的42.1%,表明受到大量游客的影响;10月8~14日期间馆内碳气溶胶略低于馆外,且与馆外浓度变化一致。 相似文献
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元素碳含量检测是保障单位热值含碳量核算准确的必要步骤,对燃煤发电企业温室气体排放核算尤为重要。为深入理解元素碳含量检测对碳排放核算的影响,采用不重复抽样分析方法,就元素碳检测对单位热值含碳量的影响、元素碳检测推行存在的障碍进行定性分析,并提出了推动元素碳检测发展以及解决元素碳执行过程相关问题的建议。研究表明,元素碳检测的推广有利于发电企业合理争取碳排放权交易利益,并不会给企业带来过多经济负担。 相似文献
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Ram Prabahar M Raja Karthik K Singh M Singh RB Singh S Dhamodharan J 《Hemodialysis international. International Symposium on Home Hemodialysis》2011,15(3):407-411
A 48-year-old man was brought to the emergency room after ingesting an unknown amount of carbamazepine. He was unconscious and not responding to the noxious stimuli. He was intubated and was placed on mechanical ventilation because of respiratory insufficiency. Primary detoxification was performed with a gastric lavage and charcoal instillation. His serum carbamazepine level was 25.6 mcg/mL at the time of admission. His computed tomography of the brain was normal. He was managed conservatively but there was no improvement in his neurological status in the next 24 hours. Serum carbamazepine level was repeated and reported to be 28.3 mcg/mL. As there was no improvement in his sensorium and the serum carbamazepine levels remained persistently high, extracorporeal removal of carbamazepine was attempted. As the facility to carry out hemoperfusion was not available immediately, the decision to initiate hemodialysis was taken. After 3 sessions of hemodialysis, his sensorium improved markedly and the carbamazepine level at this time was within the therapeutic range. He was discharged after psychiatry consultation and counseling. We review the literature regarding extra corporeal techniques for the removal of carbamazepine and discuss them in this article. 相似文献
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应用第一性原理计算了Si/Ti掺杂对AlCrCoFeNiMoTi_xSi_y八主元高熵合金力学性能的影响规律。结果表明:在AlCrCoFeNiMoTi_xSi_y合金系中,当Si元素摩尔含量为0.5、Ti元素摩尔含量为0.5、Si/Ti比值为1时,合金的杨氏模量、剪切模量最大,泊松比最小,表明该合金硬度最高、塑性最低;随着合金中Si/Ti比值的降低或升高,合金的硬度略有降低、塑性增加;当Ti元素摩尔含量为0,Si元素摩尔含量为1,Ti/Si比值为0时,合金的杨氏模量、剪切模量最小,泊松比最大,表明该合金硬度最低、塑性最高。在不同的Si/Ti比值下,高熵合金都具有一定的延展性,计算结果与实验结果吻合很好。 相似文献
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目的 针对不锈钢与钛合金异种金属焊接时,容易产生间化合物,导致焊点拉力低的现象,通过纳秒激光焊接工艺来提高不锈钢与钛合金异种金属焊接的焊点拉力.方法 采用纳秒光纤激光器进行304不锈钢与TC4钛合金的焊接实验,通过激光运行螺旋线组成焊点,并对工艺参数进行正交试验,得到焊点拉力最大的工艺参数.结果 当激光功率为90 W,激光频率为600 kHz,焊接速度为200 mm/s,螺旋线间距为0.04 mm,脉冲时间为10 ns时,得到焊点拉力最大,为29 N.结论 采用纳秒光纤激光器进行不锈钢与钛合金的焊接时,由于激光与材料作用的时间极短,约为10 ns,熔池的温度也相对较低,产生的间化合物来不及生长,从而极大提高了焊点的拉力. 相似文献
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对20钢整体热浸镀铝换热器管柬的镀层结构进行了分析,并测定了其镀层的厚度与硬度。分析结果表明,镀层由纯铝层和铁铝合金层组成,镀层均匀且与基体附着良好;镀层厚度为50~125μm,合金层厚度为37~83μm,焊缝处的镀层较母材处的薄;合金层的平均硬度为884.8HV0.02,主要由FeAl3相组成。 相似文献
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SrTiO3双功能陶瓷的表面效应 总被引:13,自引:0,他引:13
通过压制、烧成不同厚度的瓷片,发现在一定的配方和工艺条件下,SrTiO3双功能陶瓷的压敏电压U10mA与瓷片厚度无关。对瓷片进行单向磨薄后测量表观电阻率,发现SrTiO3双功能陶瓷表面效应。对本文试样,表面存在存度小于20μm、电阻率大于10^6Ω·cm的高阻层,内部是电阻率小于10Ω·cm的低电阻体。表面效应是导致SrTiO3双功能陶瓷与ZnO压敏陶瓷导电行为不同的根本原因之一,它是由于热处理时 相似文献
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采用热致相分离方法制备了膜孔径分布为0.02~0.1μm的聚丙烯平板疏水微孔膜.用正交实验设计方法对聚丙烯平板膜的制备方法进行优化设计.在正交实验设计条件下,以纯水和浓度为0.5 mol/L的NaCl水溶液真空膜蒸馏实验特性,确定了聚丙烯平板疏水微孔膜优化制备条件.在研究范围内,此优化制备条件为:稀释剂为豆油、iPP(质量分数)为27%、等规聚丙烯(iPP)熔融指数(MI)为16.08 g/10 min、淬冷温度为20℃、成核剂己二酸含量(质量分数)为0.5%、萃取剂为正己烷、铸膜液温度为190℃、刮板温度为210℃. 相似文献
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Heterogeneous nucleation of water was investigated using molecular dynamics simulation. Solid with fcc (111) surface was placed at the bottom of a cell consisting of 864 water molecules. ST2 model with NPT ensemble was used. The pressure and temperature were set to be 0.1 MPa and 275 K, respectively. The interaction between water and the solid was based on the equations proposed by Spohr. Exception was made on the lattice constant which was slightly modified to fit with that for ice structure. The shape of the solid surface was considered. It was found that the only one layer of water molecules was adsorbed in a case of a flat surface, whereas ice nucleation occurred by removing some of the atoms from the surface. Spohr's interaction was also modified so that the dipole moment of water became anti-ferroelectric. It was found that the modification increased the ice growth, further. The effect of lattice constant of solid on nucleation was also investigated. It was found that the variation on lattice constant with a few percent from that of ice was acceptable for nucleation, especially on shrinking side. On expanding side, however, it gave some gaps for water molecules to fit in other than that for ice structure, and it prevented the growth of ice. Hence, a guideline for the selection of ice nucleus material was obtained. 相似文献
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