HYDROLOGICAL OBSERVATION IN AN EVERGREEN BROAD LEAVED FOREST IN THE WUYI MOUNTAINS

[中文文摘]对武夷山甜槠林成熟林水文学效应的研究结果表明：观测期间，年大气降水量2678.78ｍｍ，林内雨量2182.04ｍｍ，林冠截留量为496.74ｍｍ；林内雨中，穿透雨量2082.08ｍｍ，树干茎流99.96ｍｍ；到达甜槠林地作用面的林内雨量中，被地表枯枝落叶层截留的雨量为159.84ｍｍ，地表径流量11.6ｍｍ，地下渗流量109.32ｍｍ，其余林内雨量形成土壤含水量增量并由地表物理蒸发、根系吸收以及植物蒸腾所消耗；甜槠林地o~20０ｃｍ土层水分初渗率78.6ｍｍ·ｍｉｎ－１，稳渗率１５．５ｍｍ·ｍｉｎ－１，达到稳渗历时４５ｍｉｎ，地表枯枝落叶最大持水量5.2ｍｍ，土壤蓄水量154.0ｍｍ。与国内其它地区不同类型的森林相比较，武夷山甜槠林具有较强的水文学效能。[英文文摘]Hydrological observations were made in a 76 year old Castanopsis eyrei forest of the Wuyi Mountains.The results are as follows:(1)In the study period during 1993～1994,annual gross precipitation,net precipitation (throughfall was 208204mm and stemflow was 9996mm)and interception loss were 267878mm,218204mm and 49674mm respectively.Interception rate was 1845%.(2)Net precipitation,the part of gross precipitation appearing on the forest floor,was redistributed through different routes.The part absorbed by litter layer was an annual amount of 15984mm,and accounting for 733%.The parts as surface runoff and below ground drainage were annual amounts of 116mm and 10932mm respectively,and accounting for0.53% and 5.01%,respectively.The rest was kept in soil and then lost to the atmosphere by means of ground physical evaporation or plant transpiration as absorbed by the roots.Its amount was 190128mm,and accounting for 87.13%.(3) The initial infiltration rate and stable infiltration rate for the soil layer of 0～20cm were 786mm·min-1 and 155mm·min-1 respectively.The time needed to arrive at the stable state was 45min.Water storage capacity of soil was 15041t·hm-2.The maximum water holding capacity of litter layer was 52mm.福建省自然科学基金,武夷山自然保护区管理局资

低能~(16)O~+离子微剂量学研究

用圆柱型流气式组织等效正比计数器测定了K 2 0 0kV低能重离子加速器提供的低能16O+离子束流在穿过 4μm厚的PET(C10 H8O4 )薄膜后的微剂量谱和径向剂量分布。测定了穿过不同厚度PET薄膜后的16O+ 束流的单次事件剂量平均比能zID随束流强度的变化曲线。用TIRM 92MonteCarlo程序计算了16O+ 离子在PET材料中的射程 ,与实验结果进行了比较和讨

Moyer模式在高能重离子加速器辐射防护屏蔽设计中的应用

叙述了Ｍｏｙｅｒ模式在高能重离子加速器屏蔽设计中的应用．介绍了Ｍｏｙｅｒ参数的选择，给出了束流的点源损失和无限或有限均匀线源损失的屏蔽计算方法．给出了根据天空反照剂量限值估算屋顶屏蔽厚度的方法．计算结果与ＭｏｎｔｅＣａｒｌｏ方法进行了比较．Application of Moyer Model tor evaluation of shielding design of high-energy heavy-ion accelerators is presented.Selection of Moyer parameters and calculations of shielding thickness in conditions of point and extended beam losses were described.Methods of determination of roof shielding thickness on the basis of sky shine dose are given.The calculations are compared with some results of analogue Monte Carlo calculations

兰州重离子加速器工作区域36路剂量监测数据获取系统

介绍兰州重离子加速器工作区域辐射环境的剂量监测数据获取系统，该系统具有３６路数据获取功能，可同时满足１８个监测点的中子、γ数据测量，实现了数据多点采集、自动同时获取和实时在线分析。对数据采集、数据存储、声光报警、剂量安全联锁及数据测量结果等进行了详细介绍。A system of data acquisition was introduced for the dose monitoring of the HIRFL environment There are 36 data acquisition channels in this system, corresponding to the 18 dose monitoring points The system has the functions of automatic data acquisition and on-line analysis in the whole monitoring process The basic working principle of the system, data acquisition, data storage, sound-light alarm, safety- interlock and some monitoring results were introduced in detai

兰州重离子研究装置注入器剂量监测系统的改进

本文介绍兰州重离子研究装置（ＨＩＲＦＬ）注入器工作区的剂量监测系统，其中包括软件、数据采集、数据存储、声光报警、剂量安全联锁及布局。采用计算机图形界面技术加入中文系统的方法，用下拉式菜单和弹出式窗口进行人机对话。实现了数据自动获取和实时分

FORMATION AND OPTICAL EXCITATION MECHANISM of Er LUMINESCENCE CENTERS IN RARE EARTH Er-LMPLANTED InP

用离子注人法对InP晶体实现高浓度稀土（rE）Er的掺杂，探索了优质材料的制作规律和条件。在低温（10~200k）测量了光致发光谱（Pl），观测到Er的尖锐发光峰，其峰值波长1.538μM，其发光强度较大；研究了该材料的热退火行为，Er发光中心的形成和光激活过程；用ruTHErfOrd背散射谱（rbS）测量给出了热退火前后注Er-InP晶体中Er离子浓度的数值及深度分布；并对Er发光中心的组成和光激发机制作了分析讨论。The rare earth doped Ⅲ - Ⅴ compound luminescence material InP: Er was prepared by ion implantation method.The photoluminescence spectra(PL) of the samples were measured at low temperature (10-200K ).The sharp luminescence peak (wavelength 1.538μm) of Er centers has been observed.The Er concentration profiles were measured by RutherFord back-scattering spectrometry (RBS) in Er-implanted Inp crystals.The Formation and optical excitation mechanism of Er luminescence centers in the samples were analysed.国家自然科学基金;北京大学稀土材料化学及应用国家重点实验室资

SECONDARY ION MASS SPECTROMETRY STUDIES of ERBIUM IMPLANTED IN SEMICONDUCTORS GaP,GaAs AND InP

近年来掺稀土元素的Ⅲ—V族化合物研究在基础物理和器件应用方面都越来越引起人们的关注,其中又由于Er-(3+)的-4I_(13/2)—4-I——(15/2)的特征发光波长为1.54μM,恰好对应于石英光纤的低损耗区,且离子注入技术简单易行,因而倍受重视.国际上已报道了不少有关Er注入Ⅲ—V族化合物的研究,大多选用较低的注入剂量(约10-(12)~10-(14)Er/CM-2),而对较高剂量的注入有待于进一步研究.Er ions were implanted in II-V compounds semiconductors GaP,GaAs and InP with relatively high dosages 5X1014/cm2 at 150keV and 350keV,respectively.Secondary Ion Mass Spectrpmetry(SIMS)depth profiles were carried out on a Cameca IMS4F ionmi-croprobe using a 600nA,15keV O2+ primary beam,rastered by 400mX400m over the sample.A mechanical aperture was employed to select positive secondary ions From the central portion of the crater(-60m in diameter).The crater total depth was measured using a profilometer.Depth profiles have been obtained and the peak depths in GaP, GaAs,InP are 55nm,51nm,56nm and 85nm,83nm,80nm at 150keV and 350keV,respectively.The sharp photoluminescence (PL)spectra have been observed at 1.538m, which correspond to the transition From the First state 4I13/2 to the ground state 4I15/2 of Er3+ aFter Face to Face annealing.国家自然科学基金资助项