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31.
介绍一种小型全内腔脉冲Ar+激光管的设计和结构。并对不同阴极,放电管直径,激励电压及Ar气压等对输出功率及激光管寿命的影响作了一系列的实验,试制出结构简单,使用方便,价格便宜的有一定实用价值的小型全内脏脉冲Ar+激光管。 相似文献
32.
报导一种全新冷却方式的双椭圆泵浦腔,具有较高的泵浦效率和光学均匀性。1.06μm调Q脉冲输出能量总转换效率η>0.75% 相似文献
33.
加氢裂化反应器新型冷氢箱的研究与工程设计 总被引:6,自引:1,他引:5
报道了加氢加化反应器新型旋流式冷氢箱的研究设计及实用效果,催化剂床层径向温差不大于5℃。 相似文献
34.
Effect of thermomechanical treatment on mechanical properties and electrical conductivity of a CuCrZr alloy 总被引:3,自引:0,他引:3
The CuCrZr alloy undergoes processes of precipitation during ageing. Besides precipitation hardening the strength is affected
by cold deformation which is performed before and after ageing.
The cold deformation (D
1) before ageing accelerates the process of strength hardening, since it induces higher rate of precipitation from the saturated
a-sold solution. Cold deformation (D
2) after ageing primarily affects the alloy strength.
In this paper the results of the effect of thermomechanical treatment on mechanical properties and electrical conductivity
of a CuCrZr alloy are presented. The aim of the paper was to evaluate the most suitable combination of thermomechanical treatment
and alloy properties. 相似文献
35.
Ti-23Al-14Nb-3V合金氩弧焊接头的显微组织及其力学性能 总被引:6,自引:1,他引:5
研究了预热对Ti-23Al-14Nb-3V合金焊接性,特别是对消除氩弧焊冷裂纹的作用以及对接头显微组织和力学性能的影响。结果表明,焊前预热可有效降低该合金的冷裂倾向。经预热处理后,焊缝区的结晶层状线消失,热影响区的硬度峰得到缓和,整个焊缝的显微硬度分布趋于均匀,但焊缝区的枝晶发生粗化,热影响区有所扩大。焊件接头的拉伸试验表明,预热可使焊缝区的接头强度系数增加,但无论预热与否,接头强度均低于母材强度,且不显示宏观塑性。 相似文献
36.
37.
四种国民常用饮水中非挥发性有机物及其致突变活性的比较研究 总被引:1,自引:0,他引:1
比较我国居民常用饮水种类自来水、净化水(自来水经净水器过滤)、凉开水(自来水经煮沸后冷却)、纯净水(自来水经以反渗透为主的多重工艺处理)的非挥发性有机物(NOP)污染状况及其致突变活性。结果表明,四种水中检测到的NOP种类分别为自来水39种,净化水40种,凉开水20种,纯净水8种;毛细色谱显示的NOP总丰面积值依次为5.62×109,5.57×109,2.65×109,1.87×109。四种水的移码型及碱基置换型致突变活性依次为:自来水>净化水>凉开水>纯净水,其中自来水在相当1L、2L、4L水量的剂量均为阳性致突变活性,而纯净水在同样的剂量均为阴性。 相似文献
38.
本文介绍了 WXJB—E 型多点温度监测报警仪的设计思想、基本原理、技术关键、技术指标及其功能。 相似文献
39.
Sugarcane can be very susceptible to damage by freezes. Freeze-deteriorated cane can cause problems in processing and sometimes leads to a factory shut-down. This study was undertaken during the 2000/2001 harvest season to assess the cold tolerance performance of six commercial sugarcane varieties and to establish new and more sensitive criteria to measure cold tolerance. Two varieties CP 70-321 and CP 79-318, with known cold tolerance, were planted in the study as controls. The other varieties included LHo 83-153, LCP 85-384, HoCP 85-845 and HoCP 91-555. Freezing temperatures occurred on 20 December 2000 when the min. field temperature was −4.4 °C, and again on 21 December, 30 December through 5 January 2001, 9–10 January and 20–21 January. The lowest field temperature recorded was −5.6 °C on 4 January. Freezing conditions prevailed for 8–15 h during each freeze incident. Stalks of all varieties were frozen to the ground following the initial freeze, with freeze cracks evident only after the 4 January freeze. For this study, samples were taken on the date of the first freeze, 20 December, and subsequently again at 7, 14, 22 and 30 days after the first freeze. Criteria used to measure overall stalk cold-tolerance included changes in pH, Brix, dextran (ASI-II method), sucrose, glucose, and fructose concentrations. Mannitol, ethanol and the oligosaccharides, palatinose, leucrose, iso-maltotriose and 1-kestose, were simultaneuously measured using IC-IPAD. Marked differences were observed in most criteria for all varieties, particularly 22 and 30 days after the first freeze. Mannitol was strongly correlated (r2=0.84) with dextran, confirming its use as an indicator for cane dextran deterioration. In comparison, ethanol was only weakly correlated (r2=0.55) with dextran and did not always predict cane dextran deterioration. Iso maltotriose was the most sensitive oligosaccharide indicator of freeze deterioration, although both leucrose and palatinose could be used to confirm whether severe dextran formation (>1500 ppm/Brix) has occurred in cane. Isomaltotriose was strongly correlated (r2=0.89) with dextran and pH (r2=−0.83); pH was also a strong indicator of both dextran (r2=−0.85) and mannitol (r2=−0.92) formation. Four of the varieties, CP 79-318, LCP 85-384, HoCP 85-845 and HoCP 91-555, were shown to be susceptible to other sources of microbial and enzymic deterioration as well as dextran deterioration from Leuconostoc bacteria, especially 30 days after the first freeze. This was indicated by increased glucose/fructose ratios, ethanol formation, changes in 1-kestose concentration, and further sucrose losses. 相似文献
40.
Tom Carter 《Urban Policy and Research》2005,23(3):265-286
Current demographic trends in Canada include population aging and declining household growth. These trends generally result in falling housing demand and stable or declining house prices. Housing markets in Canada's major cities, however, have been characterized by increases in demand and prices in recent years; due in large part to the influence of arriving immigrants. The destinations of 76 percent of international immigrants to Canada are the three global cities—Toronto, Vancouver and Montreal—where they have a very significant effect on housing demand, particularly as under current immigration policy many of those arriving come with considerable wealth. Their influence, however, is much broader and includes the growth of exclusive, prosperous immigrant neighbourhoods, new architectural designs and other neighbourhood changes. Not all immigrants, however, arrive with wealth. Many are poor, live in less attractive neighbourhoods and pay unrealistic amounts of their inadequate incomes for poor quality housing. Some end up homeless on the street. The role of immigrants in housing markets is an important consideration for urban and housing policy. 相似文献