Results 1 to 10 of about 1,228,076 (151)
Measurement of the A-Value of the Intersystem Transition in Al II at 2670 Å: Å Progress Report [PDF]
International Astronomical Union Colloquium, 1984 Ratios of intensities of spectral lines produced in the radiative decay of collisionally-excited levels of atomic ions are versatile indicators of electron density in astrophysical plasmas when one of the lines involves a metastable level (see the review by Feldman 1981 and references therein). Radiative transition probabilities (A-values) and electron
B. Carol Johnson, H.S. Kwong
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Optical spectrum of the post-AGB Star HD56126 in the wavelength interval 4010-8790 Å Å [PDF]
Astrophysical Bulletin, 2007 The optical spectrum of the post-AGB star HD56126 identified with the infrared source IRAS07134+1005 is studied in detail using high spectral resolution observations (R = 25000 and 60000) performed with the echelle spectrographs of the 6-m telescope. A total of about one and a half thousand absorptions of neutral atoms and ions, absorption bands of C2,
V. G. Klochkova +3 more
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Onomázein, 2023 Because the Chinese kinship and the Spanish one belong to the Sudanese type and Eskimo type respectively, there is a huge asymmetry and non-equivalence in the address terminologies. Although the Chinese kinship address terms, like the Spanish ones, have vocative function in the family context as well as in the non-family one, for the linguistic and ...
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, 1977 一、概况随着军事工业和普通工业的发展,射流和气动装置的应用越来越广泛,人们对空气源的净化(以下称“气源净化”)问题也有了进一步的认识。以前认为气源净化是不必要的奢侈品或加在气动系统上的多余组件,把它拆掉不用。直至一九六六年,使用者则不得不备有这些设备,因为受到损失的设备和发生故障的时间所引起的损失大大超过了气源净化设备的成本和维修费用。例如:据“Fluid ...
中国科学院力学研完所
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OnomázeinAlthough å§å§ /jiejie/ (“elder sister”) and 妹妹 /meimei/ (“younger sister”) are basic relatives' terms of the nuclear and consanguinity kinship, they mean a big challenge when they are translated into Spanish because of the linguistic and cultural differences and defaults between the Chinese and the Spanish.
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, 1991 一种用于工业废气，特别是硝酸厂尾气中氮氧化物净化的催化剂以分子筛和Ａｌ2Ｏ3混合物作为载体、铁、铜、钒和／或微量铂元素为活性组分，使用这种催化剂在３０，０００－８０，０００时-1空速下，２２０－２５０℃范围内ＮＨ3／ＮＯx为０．９－１．２时可高效净化ＮＯx（含２０００－１０００ｐｐｍＮＯx气体可净化到２００ｐｐｍ以下），该催化剂含有金属铂后可使反应温度降至２００℃左右，且ＮＯx转化率可以９８％，此外催化剂无毒，氨耗低、寿命长 ...
李北芦, 吴春田, 李时瑶
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, 1991 一种内燃机排气催化净化器由上、下壳体，前置催化床层，主体催化床层和导流散热板组成，催化剂床层用无机隔热材料包绕后装填到壳体内。由于采用无机隔热包层，使催化剂床层与壳体间不必固紧或加密封件，使其结构简单，加工精度下降，组装容易。该净化器加有导流散热板可防止地面可燃物被引燃，同时增加前置净化催化剂床层，可有利于气流分布的改善，防止了汽车不正常运行时喷油所引起的主体催化剂床层被烧坏，既提高净化率又延长了净化器的使用寿命 ...
李北芦 +3 more
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, 1990 非贵金属蜂窝陶瓷催化剂，用于汽车排气净化。蜂窝陶瓷涂有双层孔结构，改性的Ａｌ2Ｏ3作为催化剂的载体，催化剂的活性是铁的氧化物及由钴、镍、锰、铜，铬元素的氧化物和稀土铈或含有铈元素＞３５％的混和稀土元素的氧化物，本发明催化剂其耐热稳定性好，氧化铝涂层不易脱落，即使在较高温的使用条件下催化剂也具有较长的寿命 ...
李北芦, 李时瑶
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, 2014 一种空气净化处理系统，包括依次通过管路串连的空气加压设备、初级净化器、二级净化器、减压阀、二级稳压调速器、有机物过滤器和气体流量计构成；空气由空气加压设备提供给初级净化器后、依次通过二级净化器、减压阀、二级稳压调速器、有机物过滤器和气体流量计，由气体流量计出气口流出。净化后空气气体中的颗粒物小于等于0.01um；气体中的的露点为-60度至-20度；气体中的挥发性有机物TVOC含量为0.1-1ppb。空气净化处理系统，各部分部件相互独立，可以很方便的升级换代，结构紧凑，装配方便，处理气体效果好 ...
李海洋 +4 more
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, 1998 一种合成气中金属羰基化合物的净化方法是采用活性炭，特别是果壳炭的活性炭作净化剂，于净化温度０～２００℃，合成气空速≤５０００ｈ-1，合成气压力０．０１～２０ＭＰａ的条件下对合成气中金属羰基化合物进行有效的消除。为提高净化剂的活性，可对活性炭进行酸，碱或酸碱进行预处理。该工艺方法对合成气中金属羰基化合物的脱除活性高，脱的干净，且工艺简单，操作方便，适于工业化采用 ...
周焕文 +3 more
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