基于ANSYS的机械密封环温度场计算方法

研究了机械密封环的稳态温度场,在合理的假设条件下,建立了机械密封环温度场的数学模型,并利用经验公式计算了密封介质与密封环间的对流换热系数。然后利用ANSYS8.0软件计算了机械密封环的温度场,为研究机械密封环的热影响提供了参考依据。     

RC—Y3／86型燃烧器熄火原因浅析

装置三合一炉选用RC-Y3/86型半预混式燃烧器,在2003年、2004年多次发生燃烧器熄火问题。从该燃烧器结构特点入手,分析RC-Y3/86型半预混式燃烧器熄火的原因,并提出一些解决方法。     

南海南部天然气水合物稳定带厚度及资源量估算

为了估算南海南部天然气水合物资源量,文章分析了中外科学家的研究成果,认为南海南部具有天然气水合物形成、发育的有利条件：发育的沉积盆地、有利的水深和充足的物源供应,地震剖面揭示的BSR、泥底辟和断裂构造等印证了这一点；同时利用相关的计算公式，对南海南部4个重点区域的水合物稳定带厚度进行了计算，并在此基础上对南海南部的水合物资源前景进行了预测。结果表明，4 个研究区域内的绝大部分海域具有天然气水合物形成的温度、压力条件，水合物稳定带厚度67~833 m。各个海域差异较大，南海南部水合物体积及甲烷资源量分别为2.32×10¹³m³和4.78×10¹⁵m³。     

Intrinsic isotopic C labelling of polyphenols

The intrinsic isotopic labelling of plants with ¹³CO₂ is an effective method to generate highly labelled compounds using photosynthesis and avoiding labour-intensive complex organic syntheses. In this study, the intrinsic isotopic labelling of polyphenols in parsley, spinach and peppermint is shown for the first time. The plants were grown in an atmosphere where ¹²CO₂ was replaced by ¹³CO₂, in order to generate highly labelled compounds. The total content of ¹³C as well as the individual polyphenols were analysed by Isotopic Ratio-MS and HPLC–Iontrap-MSⁿ.     

Rapid degradation of the mycotoxin patulin in man quantified by stable isotope dilution assays

The absorption and degradation of the mycotoxin patulin in man was quantified by using a recently developed stable isotope dilution assay. Application of this currently most sensitive method revealed a patulin content less than 200 ng l -1 in the blood serum of five consumers of apple juice. Likewise, no patulin was found in the serum of a volunteer, whose blood was drawn shortly after consumption of a juice containing a maximum tolerable amount of patulin. In further in vitro experiments, the degradation of patulin by reacting it with whole blood was investigated. After addition of 100 μg patulin to 9 ml blood, only 6.1% of the mycotoxin was detected after 2 min. It was concluded, therefore, that even high naturally occurring concentrations of patulin in foods are quickly degraded before reaching other tissues than the gastrointestinal tract.     

丝网波纹规整填料塔设计软件开发

选取适用于丝网波纹规整填料塔的设计计算模型,通过研究分析大量资料提出了新的规整填料塔负荷性能图的绘制方法,并编写了SPSDS计算源程序,实现了负荷性能图的自动绘制和输出。考核验证了本软件的准确合理。     

木头断块油田稳产上产的基本经验和历程

木头断块油田 1986年投产开发 ,经历了 10 a稳产 10× 10 4t后 ,不断滚动勘探开发 ,不断有所发现 ,产油量连续上了2个台阶 ,实现了储量产油量翻两番的历程。其中主要经验是 :针对油田地质开发特点 ,成功地实施了 9大技术 :加密调整扩边技术 ;滚动勘探开发 ;构造精细描述 ;油藏形成机制及油气富集规律研究 ;利用老井重新试油试采重新认识储层 ;隐蔽性油藏识别技术 ;储层精细描述和深化认识断块 ;老井措施增油技术 ;区块综合治理、稳油控水技术。     

Paleolimnological proxies reveal continued eutrophication issues in the St. Lawrence River Area of Concern

Recent surface-water surveys suggest that high nutrient concentrations and nuisance algae remain issues in the St. Lawrence River Area of Concern (AOC) at Cornwall, Ontario, specifically in the tributaries and nearshore zones of Lake St. Francis (LSF). In particular, it is unclear whether management actions designed to reduce nutrient inputs, first implemented in the 1990s as part of the Remedial Action Plan for the AOC, have reduced algal production or influenced assemblage composition. To address this issue, a paleolimnological approach was used to provide a historical context for the present-day nutrient concentrations and to quantify the extent of change in water quality in LSF since the early 1990s. A sediment core was collected near the north shore of LSF and was examined for changes in the concentrations and compositions of fossil diatoms and pigments, as well as stable isotope (δ¹⁵N and δ¹³C) values. Analyses of diatom and pigment concentrations indicated that overall algal abundance has risen in the last few decades, including trends of increasing occurrences of potentially toxic cyanobacteria, despite ongoing remediation efforts. Temporal patterns of stable isotope signatures in the core suggest a steady increase in nutrient influx since the mid-20th century, with the post-1990 increase in algal production likely attributable to recent inputs associated with land-use changes in local contributing watersheds. These patterns suggest that the AOC delisting goals for the LSF tributaries will not be reached without a drastic change in land management practices.     

油井流入动态曲线与合理井底压力的确定

建立了一种新型的油井流入动态曲线方程,可用于不同流动压力下油井流入动态的计算,从理论上解释了矿场系统试井中流入动态曲线向压力轴偏转并出现最大产量点等实际问题。给出了油井最低允许流动压力的计算公式,分析了影响油井最低允许流动压力的因素。     

煤成甲烷碳同位素演化的数学模型与应用

分别介绍了以统计为基础的甲烷碳同位素与源岩成熟度关系的关系模型、以 Rayleigh方程为基础的同位素分馏模型和以动力学为基础的同位素动力学模型等 3种模拟煤成甲烷同位素演化的数学模型 ,评价了其应用范围和应用效果。用这 3种模型恢复了塔里木盆地克拉 2气田煤成气的聚散史后认为 ,克拉 2气田的天然气可能是源岩成熟过程中长期累积形成的 ,早期形成的天然气仅有少量散失 ,而晚期形成的天然气因超压而无法充注到气藏中。