条形码系统在植物记录中的应用

植物记录是植物学研究中最重要和最基础的工作。条形码技术应用于植物记录中改变了植物记录的传统模式，具有快速、准确、查找修改容易、保存时间长等优点。简单介绍了如何在植物记录中利用条形码的技术方法。     

皮纳图博火山喷发物在南极点雪层内的记录及其意义

１９９１年６月菲律宾皮纳图博火山喷发,导致大气圈火山灰气溶胶含量激增,连同１９９１年８月智利哈德森火山喷发释放的火山灰一道,导致自１９９１年１２月起南极点降水中ＳＯ＾２－４开始增加,激光雷达同时也观测到富含火山微尘气团的到达。雪样中火山微粒的电镜分析结果,以及据物质平衡观测值估算的年代等表明,１９９４年１２月在南极点０．１－０．９ｍ雪层中可钭２次火山喷发事件区别开采、估算出南极点处皮纳图博火山和哈     

冰芯粉尘微粒的X射线光电子能谱扫描电镜研究——粉尘对冰芯SO42-记录的影响

用Ｘ射线光电子能谱表面分析技术和配有Ｘ射线能谱分析仪的扫描电镜对提取于希丰邦玛峰冰芯的不溶粉尘微粒样品进行测定分析,结果显示,微粒物表面的ＳＯ＾２－４及ＳＯ＾２－０３含量明显高于内部,这种差异源于大气粉尘在沉积到雪冰中以前对ＳＯｘ的捕捉,因而与微粒本身的含硫物成分于不同来源。     

Hash算法在智能门锁中的应用

散列(hash)是一种重要的存储方法,也是一种常见的查找方法。它是指在记录的存储位置和它的关键字之间建立一个确定的对应关系。本文以射频卡智能门锁控制器为例,说明用射频卡卡号作为关键字,用Hash查找法确定此卡能否开门,并给出对应的KeilC51程序。     

基于AutoCAD2000的服装样片自由放码技术

论述了服装样片放码技术原理,以及AutoCAD2000样片的输入、输出与放码之间的关系;阐述了以AutoCAD为平台,采用VisualC 6.0和ObjectARX2000编程开发服装样片自由放码应用程序的设计思想,可提高执行效率,同时具有直接读取数字化仪和屏幕打板并用的优势。设计的应用程序,模仿了“画顺”的设计思想,重点使用了AutoCAD2000基本类库AcDb中的AcDbCurve类、LWPOLYLINE实体和addVertexAt()函数,并基于图形数据库扩展记录进行放码数据存储。给出了已成功运用到实践中的程序框图和源程序代码节选。     

授时历议中的仲康日食记录研究

“授时历议”见于《元史·历志》,是一篇用以阐述《授时历》（元代郭守敬等编制,行用于ＡＤ１２８１—１６４４）博大精深的长篇论文．通过对其中“仲康日食”记录的研究得出：１）“仲康日食”是一个与古代天文家推步合验的事件;２）《授时历》能求解出大部分“仲康日食”的现有结果;３）公元前２１２８年１０月１３日是僧一行（６８３—７２７）和郭守敬（１２３１—１３１６）推步“仲康日食”发生的日期,但尚未得到现代计算的认同;４）公元前２１２８年为仲康五年,只是古代的一个年代学结论．     

实验室仪器设备的期间核查

本文论述了实验室仪器设备期间核查的目的和意义、需要实施期间核查的仪器设备、期间核查的类型、期间核查方法的来源和期间核查的记录方式.     

Web使用挖掘中数据预处理算法的设计与实现

指出了数据预处理在Web使用挖掘中的重要性,详细分析了Web使用挖掘数据预处理过程,在每个数据预处理的每个阶段给出了一些规则并针对这些规则设计和实现了相应的预处理算法.实验结果证明这些算法是有效的.     

Holocene climatic and environmental changes recorded in Baahar Nuur Lake core in the Ordos Plateau, Inner Mongolia of China

A 5.3 m lake core was drilled in Baahar Nuur Lake in the Ordos Plateau, and measurements of meangrain size, organic δ 13C (δ 13Corg), organic carbon content (TOC), C/N, carbonate content, carbonate δ 13C(δ 13Ccar) and δ 18O (δ 18Ocar) were conducted for retrieving the Holocene chronosequence of climaticchanges based on 15 AMS 14C dates. The record documented four major stages of climate change inthe Ordos Plateau: (IV) a cold and dry condition before ～7.65 14C ka BP; (III) a warm and humid stagebetween ～7.65 and ～5.40 ka BP; (II) a generally drier and cooler climate since ～5.40 ka BP with twohumid events occurring from ～4.70 to ～4.60 ka BP and from ～4.20 to ～3.70 ka BP, and (I) a dry climatecharacterized by complete desiccation of the lake after 3.70 ka BP. Stage III can be further divided intothree sub-stages: (IIIa) a warm and humid episode from ～7.65 to ～6.70 ka BP, (IIIb) a warm and relativelydry episode from ～6.70 to ～6.20 ka BP, and (IIIc) the magthermal and maghumid episode of the Holo-cene from ～6.20 to ～5.40 ka BP.     

Pollen-recorded climate changes between 13.0 and 7.0 ^14C ka BP in southern Ningxia, China

A pollen record from Haiyuan section in the southern part of Ningxia revealed a detailed history of vegetation variation and associated climate changes during the period from~13.0 to~7.0 14 C ka BP.A steppe landscape under a moderately dry(and probably cool)condition(~12.7-~12.1 14 C ka BP)was replaced by a coniferous forest dominating the landscape under a generally wet climate from~12.1 to ~11.01 4C ka BP.This generally wet period,corresponding to the European B?lling/All?rod period,can be divided into three stages:a cool and wet stage between~12.1 and~11.4 14 C ka BP,a mild and rela- tively dry stage between~11.4 and~11.2 14 C ka BP,and a mild and wet stage between~11.2 and~11.0 14 C ka BP.The coniferous forest-dominated landscape was then deteriorated into steppe landscape (~11.0-~10.6 14 C ka BP)and further into a desert steppe landscape from~10.6 to~9.8 14 C ka BP,being correspondent to the European Younger Dryas period.After a brief episode of a cool and wet climate (~9.8-~9.6 14 C ka BP),a relatively mild and dry condition prevailed during the early Holocene(~9.6- ~7.6 14 C ka BP)and then a warm and humid climate started the mid-Holocene(~7.6-~7.2 14 C ka BP).