实木地板基材选用方法研究

以3种树种为例探讨了选用实木地板基材时需要检测的项目,以期提出一种较为实用的实木地板基材选用方法。     

硼氮化改性菜籽油润滑添加剂对钢-钢摩擦副和钢-镁摩擦夫摩擦学性能的影响

A BN-containing additive,the boron and nitrogen modified rapeseed oil (abbreviated as BNR),was prepared by chemical modification of rapeseed oil with boric and nitrous compounds.The friction and wear performances of the AZ91D magnesium alloy against the GCr15 bearing steel under lubrication of rapeseed oil containing BNR were evaluated on a SRV tribotester.The topography and chemical species of the worn surfaces of magnesium alloy were analyzed by a scanning electron microscope (SEM) and an X-ray photoelectron spectroscope (XPS),respectively.The test results indicated that the friction and wear of the magnesium alloy-steel tribomates could be effectively reduced by incorporating BNR into the rapeseed oil lubricant.The friction coefficients and the wear scars of magnesium alloy decreased with an increasing content of BNR.The surface lubricated with the BNR-doped rapeseed oil demonstrated less wear as compared with that lubricated with neat rapeseed oil.The enhanced anti-wear and friction-reducing abilities of rapeseed oil provided by BNR in the lubrication of magnesium alloy against steel were ascribed to the formation of a composite boundary lubrication film due to the strong adsorption of BNR and rapeseed oil onto the lubricated surfaces and their tribochemical reactions with magnesium alloy.     

SO2-4／TiO2-ZrO2固体酸催化剂催化废弃动植物油脂制备生物柴油

制备了SO2-4/TiO2-ZrO2固体酸催化剂,并以其催化废弃动植物油脂与甲醇发生酯交换反应制备生物柴油.结果表明,催化剂SO2-4-/TiO2-ZrO2表现出了较高的催化活性,在反应压力343 kPa下的最佳酯交换反应条件为:反应温度125℃、醇油摩尔比10∶1、催化剂用量5％、反应时间3h,该条件下废弃动植物油脂的酯化率超过92％,且催化剂重复和再生使用性能良好.     

心血管疾病患者在介入诊疗过程中辐射剂量分析

【摘要】 目的 分析心血管疾病患者在介入诊疗过程中的辐射剂量,探讨其预防措施。方法 抽取用SIEMENS Aritis Zee Floor DSA 介入诊疗的心血管疾病患者186例,记录随机配备的辐射检测系统显示的总辐射时间（T）、剂量面积乘积（DAP）、累积剂量（CD）,由DAP估算有效剂量（ED）,由CD估算最高皮肤剂量值（PSD）。结果 患者所受T为0.9 ～ 71.2 min,平均10.5 min,> 30 min的9例（4.8%）; ED为0.11 ～ 282.9 mSv,平均32.2 mSv,> 100 mSv的10例（5.4%）;1 Gy < PSD（1/2CD） ≤ 3 Gy的40例（21.5%）,PSD（1/2CD） > 3 Gy的4例（2.2%）;1 Gy < PSD（4/5CD） ≤ 3 Gy的53例（28.5%）,PSD（4/5CD） > 3 Gy的14例（7.5%）。T与PSD（1/2 CD）、PSD（4/5CD）、ED在置信度（双侧）为0.01时显著相关。结论23.7% ～ 36.0%心血管介入患者可因累积剂量导致严重的皮肤损伤,5.4%心血管介入患者有显著的致癌危险。
     

Change in Carbon Dioxide （CO2） Emissions From Energy Use in China＇s Iron and Steel Industry

 As the largest energy consuming manufacturing sector and one of the most important sources of carbon dioxide (CO2) emissions, the China′s iron and steel industry has paid attention to the study of changing trend and influencing factors of CO2 emissions from energy use. The logarithmic mean Divisia index (LMDI) technique is used to decompose total change in CO2 emissions into four factors: emission factor effect, energy structure effect, energy consumption effect, and steel production effect. The results show that the steel production effect is the major factor which is responsible for the rise in CO2 emissions; whereas the energy consumption effect contributes most to the reduction in CO2 emissions. And the emission factor effect makes a weak negative contribution to the increase of CO2 emissions. To find out the detailed relationship between change in energy consumption or steel production and change in CO2 emissions, the correlation equations are also proposed.     

Exergo-economic analysis of finned tube for waste heat recovery including phase change heat transfer

In this paper, an exergo-economic criterion, i.e. the net profit per unit transferred heat load, is established from the perspective of exergy recovery to evaluate the performance of finned tube used in waste heat recovery. Also, the dimensionless exergy change number is introduced to investigate the effect of the flow (mechanical) exergy loss rate on the recovered thermal exergy. Selecting R245fa as a working fluid and exhaust flue gas as a heat source, the effects of the internal Reynolds number Re _i, the external Reynolds number Re _o, the unit cost of thermal exergy ? _q, the geometric parameter of finned tube η _o β and the phase change temperature T _v etc. on the performance of finned tube are discussed in detail. The results show that the higher T _v and η _o β, and lower Re _i may lead to the negligible flow (mechanical) exergy loss rate. There exists an optimal value of Re _i where the net profit per unit transferred heat load peaks, while the variations of Re _o, ? _q and T _v cause monotonic change of the net profit per unit transferred heat load. The phase change temperature exerts relatively greater influence on the exergo-economic performance of finned tube in comparison with other parameters. And there exists a critical phase change temperature, where the net profit per unit transferred heat load is equal to zero.     

酶解法测定山药多糖含量的研究

目的：探讨用酶解醇沉法测定山药多糖的含量。方法：采用淀粉酶水解法、温浸法、煮提法提取山药多糖,用滴定法及硫酸-苯酚法测定多糖含量。结果：淀粉酶水解法、温浸法、煮提法测得的多糖含量分别为3.53%、0.44%、8.77%。结论：温浸法提取不完全,所得多糖值明显偏低;而煮提法则因淀粉溶出而结果虚高;与之相比,用酶解法既可较好的消除原料内淀粉的影响,多糖提取也较完全,是山药及薯蓣属植物多糖含量测定的一种较为简便、准确的方法。     

有彩数码提花织物结构设计的实践与分析

随着数码提花织物分层设计模式的提出,可以通过数个单层结构的组合来设计具有丰富混合色彩效果的提花织物。通过设计实践,对有彩数码提花织物结构设计环节中的主要技术因素,即全息组织和组合织物结构的设计方法进行深入分析,揭示不同的组织结构设计、组合方法与织物效果之间的对应关系,并以设计实现彩色数码提花织物的彩色影光效果为目标,提出合理的织物结构设计和组合的方法,为彩色数码提花织物创新设计提供必要的技术参考。     

Function mechanism of carbide layer on surface of La_2O_3 Mo cathode

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