吉林省农安县农田防护林土壤立地因子的研究

本文在广泛野外调查的基础上，彩遥感技术，电子计算机及多种数学方法，对农安县农田防护林土壤立地因子进行了研究，着重探讨了土壤立地因子与林木生长及TM数字图像信息间的关系。研究表明：（1）土壤立地因子与林木生长密切相关，杨树在不同土壤上生长量有明显差异，不同树种其适宜的土壤立地条件不同。（2）主导因子因其所处的生态环境而变，在中南部地区，影响杨树生长的主导因子为土壤可溶性总盐和PH值，而在西北部地区则为有机质及0.25～0.01mm粒级含量，同时配制了多元回归方程，并采用综合因子法把土壤立地因子划分成五线。（3）TM灰度值能够反映土壤立地因子的差异，TM各波段所反映的土壤信息是不同的，建立了土壤立地因子与TM灰度值间的定性及定量关系。这一关系的建立，不仅对土壤遥感解译有重要意义，而且也为从宏观上研究土壤微观属性提供了一条新途径。实践证明，利用TM数字图象来推断某些土壤立地因子和在TM曩像上直接解译立地类型是可行的。

基于Landsat TM的西安市城市热岛效应研究

IEECAS SKLLQG

质子滴线区新核素~(25)P的鉴别

在兰州放射性束流装置 RIBLL上 ,利用磁刚度 Bρ、飞行时间 t TOF和多重望远镜ΔE- E联合探测方法测量了 69Me V/u36Ar轰击 Be靶产生的 P同位素碎片的同位素分布 ,并与 EPAX经验公式的计算结果进行了比较 ,在质子滴线区首次鉴别出了新核素 2 5P.

Kinetic energy and charge state effects in the X-ray emission of Mo surface induced by Xeq+ (q=25, 29) ions

L-shell X-ray spectra of Mo surface induced by Xe25+ and Xe29+ were measured. The X-ray intensity was obtained in the kinetic energy range of the incident ions from 350 to 600 keV. The relationship of X-ray intensity with kinetic energy of the projectile and its charge state were studied, and the simple explanation was given.

Molybdenum L-shell X-ray production by 350-600 keV Xeq+ (q=25-30) ions

Molybdenum L-shell X-rays were produced by Xeq+ (q = 25-30) bombardment at low energies from 2.65 to 4.55 keV/amu (350-600 keV). We observed a kinetic energy threshold of Mo L-shell ionization down to 2.65-3.03 keV/amu (350-400 keV). The charge state effect of the incident ions was not observed which shows that the ions were neutralized, reaching an equilibrium charge state and losing their initial charge state memory before production of L-shell vacancies resulted in X-ray production. The experimental ionization cross sections were compared with those from Binary Encounter Approximation theory. Taking into account projectile deflection in the target nuclear Coulomb field, the ionization cross section of Mo L-shell near the kinetic energy threshold was well described. (C) 2010 Published by Elsevier B.V.