影响金钱松种子萌发因素研究

为了研究不同消毒时间、不同浸种时间和不同培养基配方对金钱松种子萌发的影响.金钱松种子采用75%酒精消毒30 s和0.1%升汞消毒15 min,用40℃无菌水浸泡12 h后,接种在不添加任何激素的MS培养基上,其种子的萌发率最高为64.5%,且幼苗生长也好.     

Experimental study of heat transfer of ultra-supercritical pressure water in vertical upward internally ribbed tube

Under ultra-supercritical pressure, the heat transfer characteristics of water in vertical upward 4-head internally ribbed tubes with a diameter of 28.65mm and thickness of 8mm were experimentally studied. The experiments were performed at P=25～34MPa, G=450～1800kg/(m2·s) and q=200～600kW/m2. The results show that the pressure has only a moderate effect on the heat transfer of ultra-supercritical water when the water temperature is below the pseudocritical point. Sharp rise of the wall temperature near the pesudocritical region occurs earlier at a higher pressure. Increasing the mass velocity improves the heat transfer with a much stronger effect below the pesudocritical point than that above the pesudocritical point. For given pressure and mass velocity, the inner wall heat flux also shows a significant effect on the inner wall temperature, with a higher inner wall heat flux leading to a higher inner wall temperature. Increasing of inner wall heat flux leads to an early occurrence of sharp rise of the wall temperature. Correlations of heat transfer coefficients are also presented for vertical upward internally ribbed tubes.     

成长的艰辛——重评黄谷柳《虾球传》

虾球经过香江流浪之旅的开启、珠江世事的浮沉、东江革命熔炉的锻炼,在成长的艰辛中感悟生命的价值,完成对自己身份的认知.     

Spectroscopic studies on interaction of hemoglobin and serum albumin with nicotine

The interactions of nicotine and Hb/SA were studied in vitro by UV/Vis, fluorescence, 1H NMR and FT-IR spectroscopies. The UV/Vis absorbance of Hb/SA (200 nm)shifted to red and decreased gradually with the addition of nicotine, indicating that the protein conformational change resulted from the chemical interaction. With increasing nicotine concentration, incubation of SA with nicotine caused the quenching of fluorescence typical of protein tryptophan residues, which meant that the vicinity of the tryptophan residues of SA was changed because of nicotine. FT-IR spectra showed that α-helix component of Hb/SA decreased, turn and β-structure components of Hb/SA increased in the presence of nicotine. In the 1H NMR spectra of nicotine, all proton peaks on pyrrolidinyl ring moved to downfield and the resonance emanating from nicotine was preferentially broadened while the concentration of Hb/SA increased. All these results indicate that nicotine and Hb/SA in vitro interact on each other, forming a new complex and inducing the protein conformational change.     

简化的人体上肢两刚体系统动力学方程的推导

通过对人体上肢解剖结构的分析研究，把上肢骨骼结构简化为两刚体的运动系统，将肱骨和躯干的连结简化为球铰，前臂和肱骨的连结简化为转动副，形成一个4自由度的两刚体系统，运用多刚体动力学理论，以卡尔登角作为广义坐标，进而推导并建立了人体上肢的动力学方程。     

三元体系相平衡问题的研究

测定了２．３－二氯丙烯（１）－环氧氯丙烷（２）完全互溶二元体系恒压下的气液平衡数据，２，３－二氯丙烯（１）－水（３）、环氧氯丙烷（２）－水（３）部分互溶二元体系的相互溶解度数据，同时测定了２．３－二氯丙烯（１）－－环氧氯丙烷（２）－水（３）于５个不同温度下的液液平衡数据。用单纯形法回归出ＵＮＩＱＵＡＣ方程参数，并对完全互溶二元体系的汽液平衡及三元体系的液液平衡进行了计算。结果与实验值较一致。     

A New Generalized Similarity-Based Topic Distillation Algorithm

The procedure of hypertext induced topic search based on a semantic relation model is analyzed, and the reason for the topic drift of HITS algorithm was found to prove that Web pages are projected to a wrong latent semantic basis. A new concept-generalized similarity is introduced and, based on this, a new topic distillation algorithm GSTDA（generalized similarity based topic distillation algorithm） was presented to improve the quality of topic distillation. GSTDA was applied not only to avoid the topic drift, but also to explore relative topics to user query. The experimental results on 10 queries show that GSTDA reduces topic drift rate by 10% to 58% compared to that of HITS（hypertext induced topic search） algorithm, and discovers several relative topics to queries that have multiple meanings.     

基于文献数据比较研究东北针阔混交林群落叶绿体遗传多样性

第四纪气候变化对植物群落产生深远影响,然而植物群落如何响应气候变化,群落内不同物种是否具有一致的响应,对于这些问题仍缺乏更系统和完整的答案．中国东北针阔混交林位于凉温带,对气候变化十分敏感,是研究物种对第四纪气候变化响应的理想区域．本研究利用文献检索调查东北针阔混交林物种谱系地理研究现状,并基于文献数据分析东北针阔混交林群落及其周边群落的遗传多样性空间分布情况．结果发现,2020年前,仅有23篇文章对27个东北针阔混交林群落物种进行谱系地理研究．无论是群落水平还是物种水平,均未发现遗传多样性的纬度梯度格局．现有的数据表明,长白山西部和大兴安岭北部地区具有较高的群落遗传多样性．这些结果表明冰期“原位避难”可能是东北针阔混交林群落物种的普遍模式,但是具体的冰期避难所位置可能存在物种差异．由于文献数据是独立而分散的谱系地理研究,存在取样种群和分子标记以及覆盖度的差异,从而导致基于文献分析的群落水平遗传多样性格局结论仍存在不确定性．未来应开展以群落遗传多样性和群落形成历史问题为导向的系统设计,以期系统性地回答群落如何响应第四纪气候变化．      

信号处理技术在示波分析中的应用

综述了从1991－1999年信号处理技术在示波分析中的应用情况．     

高级英语教学与修辞学

高级英语是为英语专业高年级学生开设的一门重要课程。本文认为,为达到较好的教学效果,教师应变传统的"释义型"教学模式为"鉴赏型"教学模式,从修辞学的角度去讲授这门课,引导学生去发现去领略名家作品之美,在欣赏中学习知识,在欣赏中提高水平。