热网工程低真空供热方案的利弊分析

在热电厂的供热机组已确定的条件下,供热方案的优劣就直接影响机组的供热能力、供热面积、热网投资、发电煤耗，影响热电厂的经济效益及热网供热系统的安全性、灵活性和可靠性。本文即是通过对铁煤集团热网工程的三环制供热方案及改造成低真空供热方案的比较分析,对热网工程中低真空供热的利弊进行了初步探讨。     

3号喷气燃料蒸馏残留量的测定探讨

根据茂名石化公司在3号喷气燃料蒸馏测定中遇到的实际情况，按照GB／T6536—1997的规定，就蒸馏残留量的大小与最后加热强度之间的关系进行探讨，得出了3号喷气燃料残留量随后加热强度的增大而减少。     

预防砼路面横向裂缝的措施

介绍了砼路面横向裂缝产生的原因及预防措施。     

VLC柱色谱法分离贯叶连翘中的金丝桃素

对减压液相柱色谱(VLC)装置进行了改进,使其更加简单、实用,并首次应用到贯叶连翘中金丝桃素的提取.并将结果与常压液相色谱相比较,减压液相柱色谱法具有分离快速,分离效能高,试剂消耗少,产率高等特点,结果非常令人满意.     

Organic residue analysis of Egyptian votive mummies and their research potential

Vast numbers of votive mummies were produced in Egypt during the Late Pharaonic, Ptolemaic, and Roman periods. Although millions remain in situ, many were removed and have ultimately entered museum collections around the world. There they have often languished as uncomfortable reminders of antiquarian practices with little information available to enhance their value as artefacts worthy of conservation or display. A multi-disciplinary research project, based at the University of Manchester, is currently redressing these issues. One recent aspect of this work has been the characterization of natural products employed in the mummification of votive bundles. Using gas chromatography–mass spectrometry and the well-established biomarker approach, analysis of 24 samples from 17 mummy bundles has demonstrated the presence of oils/fats, natural waxes, petroleum products, resinous exudates, and essential oils. These results confirm the range of organic materials employed in embalming and augment our understanding of the treatment of votives. In this first systematic initiative of its kind, initial findings point to possible trends in body treatment practices in relation to chronology, geography, and changes in ideology which will be investigated as the study progresses. Detailed knowledge of the substances used on individual bundles has also served to enhance their value as display items and aid in their conservation.     

延迟焦化试验装置的改进研究

延迟焦化减焦增液技术是一项非常诱人的技术,但评价延迟焦化生焦情况的实验比较复杂难做。研制改进了一种实验室用的延迟焦化小型试验装置,其操作简单、重复性好、精确度较高。     

糠醛厂水解渣制备活性炭新工艺研究

以糠醛厂水解渣为原料 ,以 H3 PO4为活化剂制备活性炭的工艺进行了研究 ,得出优惠工艺条件 ,与老工艺相比该工艺基本无污染。     

从脐橙皮渣中提取果胶的工艺条件研究

研究了以脐橙皮渣为原料,酸水解乙醇沉淀法提取果胶的工艺,通过正交实验,探讨果胶提取的最佳工艺条件,同时以果胶得率×粘度=胶凝单元数(Joily units)作为衡量果胶产量的综合指标.结果表明在温度为85℃,水料比15:1,pH值1.5,时间90min,果胶得率可达18.62%.     

溶液干渣法测定氯化稀土溶液中十五个稀土元素的含量

用溶液干渣法测定氯化稀土溶液中十五个稀土元素的含量,具有快速、简便的特点。可广泛应用于稀土分组分离的中间控制分析。本文研究了电流、曝光时间、电极形状等分析条件对分析结果的影响。     

弱压缩真空态的位相特性及光学衰减器中位相扩散的分析<英文>

本文利用Pegg定义的位相,研究了弱压缩真空态的位相特性。分析了光学衰减器中位相演化规律,并将位相几率分布中的扩散与Fokker—Planck得出的结果进行比较。