Practical Experiences with Films, Cameras and Navigation Systems     

R. W. Graham  & R. E. Read 《The Photogrammetric Record》1998,16(91):19-36

The first author commenced his experiences with aerial photography in 1945, when he joined the Royal Air Force (RAF). The aerial cameras used at that time were the Williamson F24 and F52, with Ilford HP3 and FP3 panchromatic films. Subsequently the Williamson F95 camera was tested against the USAF Sonne 11 camera. During his final years in the RAF, a variety of film types was employed: colour, monochrome infra-red and false colour infra-red. Additional experience was gained when the author was employed by the International Training Centre (ITC), The Netherlands and he saw the further development of the air camera from the Wild RC8 and Zeiss (Oberkochen) RMK 15/23 to the Wild RC20, Zeiss (Jena) LMK and Zeiss (Oberkochen) RMK TOP. He predicts that the future lies with digital cameras.
The second author started working with aerial photography in the 1950s. Details are given of cameras, visual navigation sights and survey aircraft dating from that period. Overseas operations, carried out mainly by Hunting Surveys and Fairey Surveys, posed particular problems because the majority of the work there was undertaken without the aid of existing maps. The introduction of external navigation systems is described, from the Decca ship navigation system, through the GNS-200 VLF/Omega low frequency radio system to INS, the Inertial Navigation System. The author later joined the ITC, which enabled him to participate in trials of the Computer-controlled Photo Navigation System. Eventually practical experience was gained with differential GPS, particularly in countries in southeast Asia. Aerial photography currently appears to benefit less from financial investment than the photographic, aviation and survey industries. However, the satisfaction of making a significant contribution to major overseas development projects outweighs the frustration of lack of acceptance of plans for the future of the air survey industry.  相似文献   

FDY—9601微机测氡仪     

张彪  梁树红 《铀矿地质》1998,14(4):241-243

本文介绍了由核工业北京地质研究院仪器研究中心研制的FDY－9601微机测氡仪。它是一种借助于经过加压极化处理过的聚酯薄膜片收集氡衰变产生的子体218Po（RaA）,并测量其放出的α射线强度的微机测氡仪。  相似文献   

太行山燕山造山带与中生代花岗岩有关的金属矿床成矿系列特征   总被引：6，自引：0，他引：6  

刘风山  石准立 《矿床地质》1998,17(3):193-203

在把握成矿系列“三同”基本前提和“五多”基本特征的基础上 ,把太行山—燕山造山带与中生代花岗岩有关的矿床划分为 6个成矿系列 ,并探讨了各成矿系列主要地质特征、稳定同位素特征、成矿热液性质及其物理化学条件 ,指出各成矿系列具有不同的特征 ,岩浆岩、地层、断裂构造等对成矿系列形成都有控制作用 ,成矿物质既来源于围岩 ,也来源于花岗质岩浆 ,并且在造山作用过程中 ,壳幔演化对各成矿系列有不同的贡献。  相似文献   

扫描电镜分析各类微体化石样品最佳镀膜的探讨   总被引：1，自引：0，他引：1  

张素新  严春杰 《地质科技情报》1998,17(4):98-100

根据多年的工作经验和试验对比,总结出了非导电微体化石－放射虫,硅藻,竹节石,有孔虫,介形虫,轮藻,牙形石,海绵骨针等的最佳镀膜方法和最佳镀膜厚度。  相似文献   

Spectroscopic ellipsometric study of the optical properties of Ag₂O film prepared by direct-current magnetron reactive sputtering     

郜小勇  冯红亮  马姣民  张增院 《海洋学报(英文版)》2010,29(9)

The Ag₂O film, as-deposited by direct-current magnetron reactive sputtering at a substrate temperature of 150 °C, clearly shows a preferential orientation (111), and is capable of lowering the threshold value of the thermal decomposition temperature to about 200 °C, which is helpful to its application in optical and magneto-optical storage. This paper fits its optical constants in terms of a general oscillator model by using measured ellipsometric parameters. The fitted oscillator energy 2.487 eV is close to the optical direct interband transition energy value of the Ag₂O film determined by Tauc equation; whereas, the fitted oscillator energy 4.249 eV is far from the fitted plasma oscillator energy 4.756 eV by single-oscillator energy. The photoluminescence spectrum centred at about 2.31 eV indicates a direct-energy gap photoluminescence mechanism of the Ag₂O film.  相似文献   

河南省金属矿产资源现状及勘查战略探讨     

王志光 《河南国土资源》1999,(3)

本文在全面论述河南省金属矿产资源特点,90年代以来金属矿产勘查开发的主要成果及存在问题,以及在主要金属矿产勘查开发前景的基础上,提出了找矿勘查四大战略:即在项目安排上,要以市场对矿产品和矿权地的需求为立项的主要依据;在矿种选择上,要重点勘查金、银,注意找寻铜、铅锌,择优勘查富钼、富铝,有条件地探索富铁、富锰;在勘查选区上,要以老区扩展为主,新区开拓为辅;在技术方法上,要大力研究和应用找矿新理论、新技术、新方法,力求深部找矿有重要突破。  相似文献   

工业相机在历史航片数字化中的应用     

张君华  凌春丽  杨勇  王友昆 《测绘通报》2021,(3):105-108

航空摄影胶片作为历史档案的一种,详细地记录了城市规模、设施等地貌信息变迁。因胶片材质保质期有限,有必要将其进行数字化永久保存。传统的扫描手段效率过低,随着一亿及以上像素的工业级别相机的诞生,使得拍照代替扫描成为可能。本文采用自行制作高精度大幅面胶片翻拍仪,通过精确校检获取准确改正参数,并结合计算机后处理,完成了昆明市2期约8500张历史航空摄影胶片的数字化试验,成果各项指标均符合要求,达到了项目预期目的。  相似文献   

可控源音频大地电磁法深部找矿实验效果   总被引：5，自引：1，他引：4  

张国鸿  李仁和 《物探与化探》2010,34(1):66-70

为了考查电磁法在探测深部金属矿及地质构造方面的实际效果,用可控源音频大地电磁法分别在埋深为500 m和1 100 m的两个已知隐伏铁、铜矿体上进行了实验工作。实验结果表明地电异常显示了矿体、断层以及岩层接触带的分布。在矿体埋藏深度小于500 m、矿层较厚时,地电异常十分明显;若矿体埋藏深度大于1 000 m,地电异常主要反应了控矿、容矿构造。  相似文献   

浅谈如何做好为农服务类气象节目     

高洪涛 《内蒙古气象》2014,(4):38-40

文章通过分析农村受众对电视气象节目的心理需求,结合近几年内蒙古气象影视所开展的为农气象服务和自身工作体会,对如何利用影视平台做好为农气象服务进行探讨。  相似文献   

Changes in the critical erosion velocity for sediment colonized by biofilm     

Hongwei Fang  Qianqian Shang  Minghong Chen  Guojian He 《Sedimentology》2014,61(3):648-659

In flowing water the incipient motion of sediment can be affected by the presence of microbial biofilm growth. This article documents a series of flume experiments using non‐uniform sediments, in which sediment entrainment was investigated for cases where the sediment was immersed in deionized water, so that no biofilm developed, and for cases where a bio‐sediment was cultivated by placing the sediment in a mixture of natural water and nutrient solution. Differences in entrainment and the velocity at incipient motion were measured over an eight week period, as biofilm grew. It was found that the incipient motion phenomena were quite distinct between the two kinds of sediment. Sediment with biofilm was more stable and, over time, incipient velocity increased to a threshold level, before declining. Biofilm development is clearly an important control on the stability of sediments, especially in eutrophic water bodies. Two incipient velocity formulas were derived for sliding and rolling conditions. Film water theory was utilized to describe the cohesive force between sediment particles and the adhesive force generated by biofilm was introduced into the formula derivation; the time variation characteristics of biofilm strength and the features of the substrate were also taken into consideration. Such analyses can help to predict sediment transport changes due to biofilm presence in nutrient‐rich water bodies.  相似文献