高分辨率阵列感应测井在薄层评价中的应用

薄层由于受围岩影响较大,常规测井曲线难以有效的反映薄层的真实测井响应,进而无法有效评价储层特性和解释储层参数.随着测井新技术的发展和日趋成熟,高分辨率阵列感应测井已大批量投入到了实际生产中.根据研究表明,阵列感应测井能够准确识别薄层、划分厚度、判断油水层等,在薄层评价中具有明显的技术优势,取得了很好的应用效果.     

煤气化副产物粗酚的初步研究与模拟计算

以煤气化副产物粗酚为研究对象,设计了三塔连续减压精馏工艺,并利用Aspen Plus软件对整个分离过程进行了模拟计算。通过选择物性方法和组分的简化、DSTWU模块的简捷设计和RadFrac模块的严格计算,然后应用模型分析工具优化得到了粗酚系统连续减压精馏的工艺参数。若各塔轻关键组分的回收率设为98%,在一定的进料条件下,塔1、塔2、塔3的理论塔板数分别为51、28、24;最佳进料位置分别在22、14、14块板;塔顶产品与进料的质量流率之比(D/F)分别为0.293 3、0.1912、0.647 6。得到苯酚、邻甲酚和间甲酚产品的质量分数分别为99.6%、90%和83.1%。     

带气液分离器自动复叠系统中节流阀开度引起的混合工质浓度偏移(英文)

Auto cascade refrigeration (ACR) cycle with phase separators is widely used in the cryogenic system. The compo-sition of mixed refrigerant has a great effect on the performance of the system. Based on the assumption of infinite volume of phase separator, ACR system with one phase separator is simulated in this paper. The variation of refrigerant composition under different valves opening is obtained. A related experimental system is set up to verify the variation. The result shows that when the valve opening connected to the evaporator increases or the valve opening under the phase separator decreases, the low-boiling component concentration of the working mixture passing through the compressor and condenser increases, while the high-boiling component concentra-tion decreases. Furthermore, the variations of condensation pressure and evaporation pressure under different valves opening are also observed. This paper is helpful to deepen the understanding of ACR system.     

Antioxidant Activity of Rambutan (Nephelium lappaceum L.) Peel Extract in Soybean Oil during Storage and Deep Frying

Rambutan (Nephelium lappaceum L.) peel (RBP) is discarded as the main by‐product during processing of the fruit. Increasing attention is now paid to the valorization of RBP for the recovery of valuable compounds. Geraniin, ellagic acid, quercetin, and rutin are the main phenolic compounds found in methanolic RBP extract. Extracted rambutan peel powder (ERPP) is used to evaluate the oxidative stability of soybean oil stored at 4 and 30 °C in the dark and light and deep fried with potatoes at 160 °C. Tert‐butylhydroquinone (100 µg g^?1 oil, TBHQ) serves as positive control. Oil supplemented with ERPP of 1000 µg gallic acid equivalents (GAE) g^?1 of oil shows positive effects on the retardation of the oxidation process during storage in comparison with oil without addition. During deep frying, either ERPP (1000 µg GAE g^?1) or TBHQ retards the lipid oxidation of oil. Levels of thiobarbituric acid reactive substances of potatoes fried in oil fortified with the extract and TBHQ (0.4–0.59 µg g^?1) are much lower than those without the extract (1.31 ± 0.10 µg g^?1) (p < 0.05). Therefore, RBP extract exhibits favorable antioxidant effects and can be used for effectively inhibiting lipid oxidation in oil during storage and deep frying. Practical Applications: An extract from rambutan fruit peel containing phenolic compounds, that is, geraniin, ellagic acid, rutin, and quercetin showed promising results to be used as potential antioxidants in soybean oil during deep frying. Both oxidation of the frying oil as well as the oxidation of the food product, that is, potatoes were inhibited. These results demonstrated that rambutan fruit peel extract can be used as a natural antioxidant in frying oil to replace synthetic antioxidants, that is, TBHQ.     

大连国际会议中心楼盖振动测试与分析

大连国际会议中心15.30m标高平台周圈均为大悬挑结构形式,各会议厅也主要采用大跨度钢楼盖,对人行激励可能会非常敏感。而该建筑功能对舒适度的要求较高,所以需重视人行激励下的楼盖振动问题。本工程中较多地采用悬挑与大跨度的结构形式,所以楼盖的竖向振动就成为比较重要的问题。对结构自振特性做了初算,并进行了现场测试,根据现场测试结果调校模型,将加速度分析结果与实测结果进行比对。列出了各分区的自振特性,根据各分区的功能情况进行加速度分析,并将达沃斯会议厅随机振动分析的加速度情况和国际标准组织ISO的方法进行了比较。     

长支链聚乙烯的制备与性能

通过过氧化二异丙苯(DCP)引发三官能单体三羟甲基丙烷三丙烯酸酯(TMPTA)对高密度聚乙烯(HDPE)进行熔融接枝改性,同时利用大分子自由基间的偶合反应制备出长支链聚乙烯(LCBPE)。转矩曲线和傅里叶变换红外光谱测试表明TMPTA成功接枝到HDPE,解释了熔融支化法制备LCBPE的机理。利用多种流变分析方法,如储能模量、损耗角、Cole-Cole图等方法有效区分了LCBPE和HDPE。采用差示扫描量热和X射线衍射分析技术,研究了引发剂用量对LCBPE结晶性能的影响,结果表明,长支链LCB结构的引入使HDPE的熔点、结晶度和起始结晶温度提高,晶体结构和晶型未发生变化,晶粒尺寸增大。利用热台偏光显微镜对HDPE和LCBPE晶体形态进行分析,发现LCBPE相比HDPE晶核增多,晶体生长速度降低。     

技术与艺术的完美统一——雨水花园建造探析

雨水花园是一种生态可持续的雨洪管理以及雨水利用设施,具有低成本、高效能、建造简单等优点.首先阐述了雨水花园的定义及其源流,介绍了雨水花园的功能与类型;然后从选址、土壤渗透性检测、结构与深度的确定、面积的确定、平面布局以及植物选择等方面对雨水花园的建造方法进行了详细研究;最后,针对中国现状,就雨水花园如何在国内发展提出了建议.     

Estimation of the exposure of the French population to the BSE agent: comparison of the 1980-95 consumption of beef products containing mechanically recovered meat in France and the UK,by birth cohort and gender

Assuming that human exposure to BSE was through beef mechanically recovered meat (MRM) consumed as burgers and other meat products, we estimated the French consumption of different food items containing beef MRM, and compared these consumptions for French and British populations. To estimate consumption of meat products containing bovine MRM, we used dietary data from national individual and household food surveys conducted between 1980 and 1995. After reconciliation of consumption data between the available surveys and calendar year adjustments, we simulated consumption of one-thousandth of the French population. Consumption was estimated by birth cohort and gender, and for the periods 1980-89 and 1990-95 separately. Data showed that burgers (including manufactured minced meat) represented around 75-80% of the individual consumption of meat products containing MRM, and that consumption of burgers increased by 40% over the 1980-95 period. In all age groups, consumption was higher in males than in females. In both genders, the 1940-69 birth cohort had the highest mean consumption of burgers and other beef products containing MRM. Similar findings have been reported for the UK population. Estimated consumption of bovine MRM per calendar year increased markedly over the study period, concomitantly with an increase of bovine carcasses imported from the UK. Comparison of the 1980-1995 pattern of bovine MRM consumption in the UK and France indicated thatthis consumption peaked later in France than in the UK. This difference might result in different temporal pattern of vCJD incidence.