An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client‘s queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

The construction of technical standard system for ultra deep and high sour gas fields in Northeast Sichuan Province，China

To deal with the exploitation difficulties of gas fields in Northeast Sichuan with deep marine strata, after researching the relative standards domestic and abroad extensively, summarizing and promoting the successful experiences and failure lessons of project construction technology application scientifically, Sinopec has established an integrated technical standard system for the exploration and development of ultra deep and high sour gas fields. The system consists of 51 enterprise standards and covers 7 professions including geophysical prospecting, drilling, drilling log, well logging, gas formation test and production, sour gas gathering and transferring system, and HSE (health,safety,environment). It guides and guarantees the safe, high-quality and high-efficiency project construction effectively by means of enhancing the engineering design criterion, recommending the data processing and interpretation methods, identifying the requirements of operation and field inspection and standardizing the application of technical equipments.     

Development of a new method for analyzing free aluminum ions （Al3＋） in seafood using HPLC-ICP-MS

This paper presents a novel method for simultaneous online examination of free aluminum ions （Al3＋） in seafood, using solid- phase extraction and high-performance liquid chromatography online with inductively coupled plasma mass spectrometry （SPE- HPLC-ICP-MS）, without post-column reaction. The optimum conditions for chromatographic separation of Al3＋ were achieved using an IonPac CS5A analytical column with an IonPac CG5A guard column. The mobile phase consisted of 0.040 mol/L LiOH, 0.0060 mol/L 2,6-pyridinedicarboxylic acid, and 0.090 mol/L CH3COOH （pH 4.7）. The free Al3＋ ions in seafood were extracted by shaking with the mobile phase at 70℃ for 2 h. SPE was conducted using an Oasis MCX, 3cc/60 mg, 30 μm column, which was activated and equilibrated with 2 mL of methanol and 4 mL of deionized water before use. HCl （0.075 mol/L, 2 mL） was used to wash inorganic Al from the SPE column. The standard recoveries of Al3＋ were all above 89% and the relative standard deviations were all below 5%. The proposed method was successfully used for the examination of Al3＋ in seafood samples, and the results were similar to those obtained using the static equilibrium method.     

光谱法测定植物组织中甜菜碱含量方法的改良

甜菜碱的积累水平与植物抗逆性密切相关,因此准确分析植物组织中甜菜碱含量可了解植物的抗逆能力.在总结前人研究的技术基础上,对传统的光谱法测定甜菜碱含量方法进行了一些改良,用少量乙醇溶解雷氏盐,调整雷氏盐与甜菜碱反应时间为6h.多次试验表明,该改良的光谱法能准确测定出植物组织中的甜菜碱含量.     

一种离散点插值的新算法

提出了一种按离散测量点构造曲面的新方法,即对每一测量点定义一个矩形作用域,并在每个作用域上构造一个特殊的Hermite插值曲面,最后通过各作用域在高度上的叠加来构造一张插值曲面.证明了新算法的完备性和对测量点的依赖性.     

尿碘测定方法的改进

根据国标法尿碘砷铈催化分光光度法原理,在保持反应温度和试剂浓度不变的条件下,将Ｃｅ４＋在碘催化作用下变成Ｃｅ３＋的反应时间由原来的１５ｍｉｎ改为１０ｍｉｎ,使得尿碘测定的线性范围由原来的０～３００μｇ／Ｌ拓宽至０～４５０μｇ／Ｌ,而试样体积（０．２ｍＬ）和方法的最低检出浓度（６μｇ／Ｌ）仍与国标法一样．结果表明：改进的尿碘测定法精密度、准确度和重现性均良好,所有实验结果的变异系数不超过５．５％,平均回收率为１０１．３％,经符号检验,其方法与国标法的测定结果之间无显著差异（显著水平为１０％）．可缩短实验时间,减少工作量     

RAPD技术在蔬菜种质资源研究中的应用

对RAPD技术在蔬菜种质资源研究中资源鉴定分类、杂合体鉴定、突变体检测、杂交世代分析、遗传图谱构建等研究领域进行了介绍。     

齿轮的精加工——金刚石电化学法

讨论了金刚石电化学精加工齿轮的原理、工艺参数及实验装置。分析了电解和机械磨削中用微磨削方法和电化学方法去除金属的速度,两者取速度比最大值时,则有利于达到很高的加工精度。提出了齿轮纵向误差产生的动力学方程,得出径向跳动、齿向误差与加工时间的关系。最后通过实验,证明了金刚石电化学加工时精度的提高是显著的,且金刚石阴极耐磨性高,能够根据工件形状尺寸及加工间隙的分布规律来设计。     

大学生创造性思维能力培养方法探讨

本文论述了创造性思维的涵义和本质特征，提出了增强创新意识是大学生创造性思维能力发展的关键；教师引导是培养大学生创造性思维能力的保证；强化知识教育是培养大学生创造性思维能力的根基；学术活动是培养大学生创造性思维能力的途径；现代化教学手段是培养大学生创造性思维能力的助力；激发好奇心和想象力是培养大学生创造性思维能力的条件；塑造不畏艰险和献身科学的精神品格是培养大学生创造性思维能力的要素。     

新型自行车储能装置

该文旨在设计一种区别于电动车,但可安装在自行车上的轻便式的新型储能装置来储存电能,然后通过装置内变压器的作用达到能够对外输出电能,供手机,笔记本等随身携带的小功率电子设备使用的效果.     

微波法合成聚维酮碘的研究

用微波和正交设计技术研究了碘化钾存在下固相、液相法合成聚维酮碘的工艺条件.液相法中,以乙醇为溶剂探讨了配料比、反应酸度、微波功率、反应时间等因素对聚维酮碘产率的影响.固相法中,以碘化钾为转化剂考察了配料比、微波功率、反应温度和反应时间等因素对聚维酮碘产率的影响.同时,在正交设计试验的基础上,对合成聚维酮碘的条件进行了优化和验证.结果表明,用微波辅助的方法,无论是固相法还是液相法均能够在较短的时间内得到有效碘的含量大于10%的聚维酮碘.     

碘分析方法研究概况

碘缺乏病仍严重威胁着人的身体健康。当人体严重缺碘会导致甲状腺肿大,生育率降低,婴儿死亡率上升;当人体内碘含量高于某一水平时,会导致人的智力和抵抗疾病的能力下降。因此碘的分析方法是人们极为关注的问题。目前已见报道的有几十种方法,本文仅对目前常用的方法作一总结。     

云南思茅的野生蔬菜资源

报道了产于云南思茅的野生蔬菜25科29属32种，并对部分特色野菜作叙述。