可视化XRF软件数据采集系统的开发   总被引：1，自引：0，他引：1  

曾国强  林延畅  葛良全 《物探化探计算技术》2004,26(3):274-277

介绍了在Windows操作系统下用VC^ 6．0编制的XRF分析软件。该软件采用基于多线程的串口数据采集及处理技术，且操作方便数据处理能力强。  相似文献   

基于VB通信控制技术的气象短信服务     

邹书平 《气象科技》2006,34(4):482-484

气象短信业务是GSM运营商与气象部门合作开展的面向群体和公众的一种服务。文中介绍了如何利用Visual Basic 6.0通信技术,实现PC机与GSM模块之间的通信,开展气象决策短信服务。主要对短信编辑、短信发送、系统管理和一些关键技术作了较为详细的阐述,可为其他地市级气象局设计出有自己特色的气象决策短信服务平台系统提供技术借鉴和参考。该系统设计过程中强化信息的发布权威,对外发布的内容必须经过审阅和签名,对用户号码实行授权管理等。  相似文献   

辽阳地区6～8月耗电量与气象条件关系及预报   总被引：2，自引：3，他引：2       下载免费PDF全文

张梅  陈玉光  韩家福  董绍彤 《气象与环境学报》2006,22(2):62-64

根据2002～2004年辽阳地区逐日耗电量和气象资料,分析了6～8月耗电量与气象条件的关系。结果表明:耗电量对气温的变化最敏感,与日照、降水、相对湿度等气象要素也有一定的相关性。在此基础上建立多元回归预报模型,对每月的逐日平均、最大、最小耗电量进行预报,对建设节能型社会、提高用电效率具有应用价值。  相似文献   

Oxygen depletion off the Changjiang (Yangtze River) Estuary   总被引：25，自引：0，他引：25  

李道季  张经  黄大吉  吴莹  梁俊 《中国科学D辑(英文版)》2002,45(12):1137-1146

In a survey on the Yellow Sea and the East China Sea on August 20-30 of 1999, we found a hypoxic zone (<2 mg/L) of 13700 km² with an average thickness of 20m at the bottom of the Changjiang (Yangtze River) Estuary, with an oxygen minimum value of 1 mg/L. The extension of the dissolved oxygen deficiency extended to the 100m isobath in a southeastward direction along the bottom of the continental shelf of the East China Sea. During the last two decades, the minimum dissolved oxygen values in the low oxygen region of the Changjiang Estuary have decreased from 2.85 mg/L to 1 mg/L. In the hypoxic zone, the apparent oxygen utilization (AOU) was 5.8 mg/L and the total oxygen depletion approximately 1.59 × 10⁶t. The strong halocline above the hypoxic zone, as a result of affluent water from the Changjiang, Taiwan Warm Current (TWC), and the high concentrations of particle organic carbon (POC) and nitrogen (PON) are the major factors causing the formation of the hypoxic zone. The POC: PON ratios and nutrient concentration distributions in the hypoxic zone suggest that the oxygen deficiency in the bottom water during the summer in the East China Sea off the Changjiang is the result of organic carbon production enhanced by nutrients from the Changjiang and fluvial organic matter input, followed by a shift in regeneration of nutrients in the East China Sea.  相似文献   

MHD model of magnetosheath flow: comparison with AMPTE/IRM observations on 24 October, 1985     

C. J. Farrugia  H. K. Biernat  N. V. Erkaev  L. M. Kistler  G. Le  C. T. Russell 《Annales Geophysicae》1998,16(5):518-527

We compare numerical results obtained from a steady-state MHD model of solar wind flow past the terrestrial magnetosphere with documented observations made by the AMPTE/IRM spacecraft on 24 October, 1985, during an inbound crossing of the magnetosheath. Observations indicate that steady conditions prevailed during this about 4 hour-long crossing. The magnetic shear at spacecraft entry into the magnetosphere was 15°. A steady density decrease and a concomitant magnetic field pile-up were observed during the 40 min interval just preceding the magnetopause crossing. In this plasma depletion layer (1) the plasma beta dropped to values below unity; (2) the flow speed tangential to the magnetopause was enhanced; and (3) the local magnetic field and velocity vectors became increasingly more orthogonal to each other as the magnetopause was approached (Phan et al., 1994). We model parameter variations along a spacecraft orbit approximating that of AMPTE/IRM, which was at slightly southern GSE latitudes and about 1.5 h postnoon Local Time. We model the magnetopause as a tangential discontinuity, as suggested by the observations, and take as input solar wind parameters those measured by AMPTE/IRM just prior to its bow shock crossing. We find that computed field and plasma profiles across the magnetosheath and plasma depletion layer match all observations closely. Theoretical predictions on stagnation line flow near this low-shear magnetopause are confirmed by the experimental findings. Our theory does not give, and the data on this pass do not show, any localized density enhancements in the inner magnetosheath region just outside the plasma depletion layer.  相似文献   

陕西榆林侏罗纪层序地层分析及其意义     

赵廷周  崔永泉  赵忠良 《陕西地质》1996,(1)

陕西榆林侏罗系可划分4个层序。通过大断面写真、钻孔断面分析发现，层序－2（延安组）是3种类型小层序的重复叠覆，可归并为9个体系域，与海相地层有较大差异。系统分析其层序地层学特征，对于恢复古盆地水动力循环系统、沉积过程及矿产预测有重要意义。  相似文献   

De-bugging the 'millipede' porphyroblast microstructure: a serial thin-section study and 3-D computer animation   总被引：1，自引：0，他引：1  

S. E. JOHNSON  R. R. MOORE 《Journal of Metamorphic Geology》1996,14(1):3-14

ABSTRACT Seventy-five spatially orientated, serial thin sections cut from a single rock containing ‘millipede’ porphyroblast microstructure from the Robertson River Metamorphics, Australia, reveal the three-dimensional (3-D) geometry of oppositely concave microfolds (OCMs) that define the microstructure. Electronic animations showing progressive serial sections of the 3-D microstructure are made available via the World Wide Web. The OCM amplitudes decrease regularly from a maximum in near-central sections to a minimum in near-marginal sections, whereas the OCM interlimb angles increase regularly from a minimum in near-central sections to a maximum in near-marginal sections. These observations illustrate that the OCMs are noncylindrical surfaces with culminations located in near-central sections. Because the porphyroblast cores appear to have been present before significant development of the syn-OCM foliation, all of the OCMs were formed by heterogeneous extension around these cores. The overall geometry of the OCMs described here reflects the strain state, and cannot be used to constrain deformation paths.  相似文献   

用TURBO BASIC实现国际二号码的异步串行通信     

吴先英 《气象研究与应用》1997,(2)

着重介绍了国际二号码与ASCII码相互转换及用TURBOBASIC实现异步串行通信时的一些关键技术的解决办法。  相似文献   

Kinetics of the Reaction of Hydroxyl Radicals with CH2Br2 and its Implications in the Atmosphere     

Deqiang Zhang  Jinxian Zhong  Lianxiong Qiu 《Journal of Atmospheric Chemistry》1997,27(2):209-215

Rate constants for the reaction of hydroxyl radicals with dibromomethanehave been measured by discharge flow-resonance fluorescence technique(DF-RF) over the temperature range 288–368 K. The derived Arrheniusequation is k₁=(1.51 ± 0.37)× 10^-12 exp(-(720 ±60)/T) cm³ molec.^-1 s^-1.The tropospheric lifetime of dibromomethane has been estimated to be 0.29years. An ozone depletion potential (ODP) value of 0.10 for dibromomethanehas been obtained.  相似文献   

Implications of ozone depletion for surface-water photochemistry: Sensitivity of clear lakes   总被引：1，自引：0，他引：1  

Norman M. Scully  Warwick F. Vincent  David R. S. Lean  William J. Cooper 《Aquatic Sciences - Research Across Boundaries》1997,59(3):260-274

Increased ultraviolet-B radiation (UV-B) in aquatic ecosystems brought about by stratospheric ozone depletion may result in increased formation rates of photochemical reaction products in the surface waters of aquatic ecosystems. In this study, the potential impact of increases in lower wave-length radiation on the formation of hydrogen peroxide (H₂O₂) and singlet oxygen (¹O₂) was modelled for lakes over a range of dissolved organic carbon (DOC) concentrations. The impact of increased UV-B radiation on the production of carbon monoxide (CO) was also calculated for two humic stained systems. The relative increases of H₂O₂ and¹O₂ production were greater in the clear lakes (70% increase in photochemical reaction rates near the surface) than the coloured systems (25%). Production of CO in the study sites also increased under depleted ozone conditions implying increased DOC losses to the overlying atmosphere.  相似文献