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  • TB/T 1906.3-2003鐵道貨車耐大氣腐蝕冷彎型鋼.第3部分:端墻橫帶Railway freight car’s atmospheric corrosio res ist in gc old formeds teels ections Part3 : End cros sband

    本部分規定鐵道敞車端墻橫帶耐大氣腐蝕冷彎型鋼(以下簡稱端墻橫帶冷彎型鋼)截面尺寸、技術要求、試驗方法、檢驗規則、包裝、標志及質量證明書等內容。<br>本部分適用于熱軋鋼帶在連續輥式冷彎機組上生產的冷彎型鋼。不適用于拉拔、沖壓、彎折等方式生產的型鋼。...

    2022-06-13 15:44:03瀏覽:9 型鋼railwayatmospheric

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  • GB/T 33672-2017大氣甲烷光腔衰蕩光譜觀測系統Cavity Ring-Down Spectroscopy system for measurement of atmospheric methane

    本標準規定了觀測大氣甲烷濃度的光腔衰蕩光譜觀測系統的工作原理、構成和功能、技術指標要求和安裝環境要求。? <br>本標準適用于大氣甲烷的光腔衰蕩光譜觀測,也適用于觀測系統的設計、加工等。...

    2022-06-10 07:53:18瀏覽:3 atmosphericmeasurementspectroscopy

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  • GB/T 14410.9-2009飛行力學.概念、量和符號.第9部分:大氣擾動模型Flight dynamics—Concepts,quantities and symbols—Part 9:Models of atmospheric motions

    GB/T14410的本部分規定了影響飛機飛行特性的大氣擾動模型的概念、量和符號。<br>本部分適用于固定翼飛機,其他飛行器可參照使用。...

    2022-06-05 17:33:35瀏覽:4 dynamicsconceptsatmospheric

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  • Environmental Process and Convergence Belt of Atmospheric NO2Pollution in North China

    Both surface environmental monitoring and satellite remote sensing show that North China is one of the regions that are heavily polluted by NO2. Using the NO2 monitoring data from 18 major cities in the region,the tropospheric NO2 column density data from the Ozone Monitoring Instrument (OMI) on the Aura satellite,and the observations from the China Meteorological Administration network,this paper analyzes a regional NO2 pollution event in February 2007 over North China,examines the convergence of the pollutant,and identifies its correlation with the atmospheric background conditions.The results show that daily mean NO2 concentrations derived from surface observations are consistent with the mean values of the OMI measurements,with their correlation coefficient reaching 0.81.The correlations of NO2 concentration with general weather patterns and sequential changes of temperature structure from 925 hPa down to the surface indicate that the weather fronts,high pressure and low pressure systems in the atmosphere play a role in changing the temporal and spatial evolutions of NO2 through removing,accumulating or converging of the pollutant,respectively.It is also found that the eastern Taihang Mountains is most heavily polluted by NO2 in North China.Based on a model that correlates NO2 column density with surface wind vector,the relation of the NO2 concentrations in six major cities in North China to the surrounding wind field is analyzed. The results show that the maximum wind field is associated with the highest frequency of pollution events,and under certain large-scale atmospheric conditions together with the topographic effect,small- and meso-scale wind fields often act to transport and converge pollutants,and become a major factor in forming the heaviest NO2 pollution event in North China.Analysis of the causes for the severe NO2pollution event in this study may shed light on understanding,forecasting,and mitigating occurrences of heavy NO2 pollution....

    2020-11-11 22:33:38瀏覽:22 atmosphericpollutionEnvironmentalprocessconvergencebeltSatelliteremote

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  • Some characteristics of the atmosphere during an adiabatic process

    Some important characteristics of the atmosphere during an adiabatic process are investigated, which include the invariability of atmospheric entropy range and local surface potential temperature, the conservation of the atmospheric mass intervened between any isentropic surface and the ground, and the isentropic surface intersecting with the ground. The analysis shows that the atmospheric reference state (ARS) for investigation on available potential energy (APE) should be defined objectively as the state which could be approached from the existing atmosphere by adiabatic adjustment, and be related to initial atmospheric state before adjustment. For the initial atmosphere state at any time, its corresponding ARS is different from the one at another time. Based on the above-mentioned conclusions,the reference state proposed by Lorenz cannot be obtained physically, so a new conception, the conditional minimum total potential energy, is put forward in order to objectively investigate atmospheric APE....

    2020-11-11 22:33:38瀏覽:35 availablepotentialenergyadiabaticisentropicsurfaceatmosphericreference

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  • 鎳負載柱撐蛭石催化甲烷與二氧化碳重整制合成氣

    用浸漬法制備12Ni-PCVMT催化劑,考察了制備方法對其結構及甲烷干重整催化性能的影響。結果表明,在常壓,750℃條件下,經過17 h在線評價后,12Ni-PCVMT催化劑具有高的反應活性和穩定性,具有較好的鎳分散性、粒徑分布更均勻,比表面積較大,從而具有更好的Ni抗燒結能力及抗積炭性。...

    2020-10-22 17:35:41瀏覽:37 浸漬法鎳催化劑常壓CO2重整合成氣dippingmethodnickelcatalystatmosphericpressureCO2

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  • 飛機下滑對大氣紊流的動力學響應

    為了仿真大氣紊流下的飛機著艦下滑過程中的動力學響應,引入了三維的大氣紊流模型并將紊流速度以及紊流速度梯度的影響加入到飛機下滑過程的動力學模型中,建立了過程中飛機的六自由度飛行動力學模型.同時引入了Von Karman大氣紊流模型并生成了工程化的紊流風場.在建?;A上,分析了紊流速度和紊流速度梯度對飛機的影響,并采用數值方法仿真了飛機下滑穿越紊流的全過程.結果表明,大氣紊流的存在會造成飛機的飛行姿態無法保持穩定,并會最終導致實際著艦點偏離理想著艦點,影響飛機的安全回收....

    2020-08-30 18:25:27瀏覽:20 大氣紊流紊流速度紊流速度梯度動力學模型atmosphericturbulencevelocityof

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  • A New Way to Study Water-Vapor Absorption Coefficient

    In the visible spectrum, the atmospheric attenuations to sunlight mainly include aerosol scattering, atmospheric molecule Rayleigh scattering and ozone absorption, while in the near-infrared spectrum (from 650 nm to 1000 nm), we must take water-vapor absorption into account. Based on the atmospheric correction theory, using spectrum irradiance data measured by Instantaneous Ground spectrometer, ozone content measured by Microtops Ⅱ ozone monitor,water-vapor content and aerosol optical thickness measured by sun photometer, we give a new way to study water-vapor absorption to sunlight, and the result shows that the main peak values of water-vapor absorption coefficients are 0.025 cm-1, 0.073 cm-1, 0.124 cm-1, 0.090 cm-1, 0.141cm-1 and 0.417 cm-1, which respectively lie at 692 nm, 725 nm, 761 nm, 818 nm, 912 nm and 937 nm....

    2020-07-08 21:52:19瀏覽:19 atmosphericattenuationwater-vaporozoneaerosolscatteringRayleigh

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  • Research on Water-Vapor Distribution in the Air over Qilian Mountains

    Based on the re,note sensing data, the radiosonde data and precipitation data observed by weather stations, distributions of atmospheric water-vapor and cloud motion wind over the Qilian Mountains are analyzed. Moreover, on the basis of water-vapor and cloud motion wind analyses, relations of atmospheric water-vapor distribution with precipitation, atmospheric circulation, and terrain are investigated. The results show that distributions of atmospheric water-vapor and precipitation in the Qilian Mountains are affected by the westerly belt, the southerly monsoon (the South Asian monsoon and plateau monsoon), and the East Asian monsoon. In the northwest Qilian Mountains, water-vapor and precipitation are entirely affected by the westerly belt, and there is no other direction water-vapor transport except westerly water-vapor flux, hence, the northwest region is regarded as the westerly belt region. In the south and middle of the mountains, water-vapor is mainly controlled by the southerly monsoon, 37.7% of the total water-vapor is from the south, especially in summer, the southerly water-vapor flux accounts for 55.9% of the total, and furthermore the water-vapor content in the southerly flow is more than that in the westerly flow. The southerly monsoon water-vapor is influenced by the South Asian monsoon from the Indian Ocean and the plateau monsoon in the Qinghai-Tibetan Plateau, thus, the south and middle region is called southerly monsoon region. But in the northeast Qilian Mountains, the East Asian monsoon is the main climate system affecting the water-vapor. Besides west and northwest water-vapor fluxes, there are a lot of easterly water-vapor fluxes in summer. The frequency of easterly cloud motion winds in summer half year accounts for 27.1% of the total, though the frequency is not high, it is the main water-vapor source of summer precipitation in this region, therefore, the northwest region is a marginal region of the East Asian monsoon. On the other hand, atmospheric water-vapor, precipitation, and conversion rate of water-vapor into precipitation are closely related with altitudes and circulation system. Generally, there is a peak value of water-vapor content at the altitude from 3500 to 4500 m on the windward slope, but on the leeward slope,water-vapor monotonically decreases with altitude descending except for that in the East Asian monsoon region. Water-vapor on the leeward is much less than that on the windward slope, and the maximal difference in water-vapor content between the two sides may reach about 4.49 kg m-2. Either the values of water-vapor content, precipitation or the conversion rate of water-vapor into precipitation all reach their maxima in the East Asian monsoon regions, and correspondingly the peak value of water-vapor on the windward is also large and occurs at a lower altitude in comparison with other two regions....

    2020-07-08 21:52:19瀏覽:26 SatelliteremotesensingdataQilianMountainsatmosphericwater-vapor

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  • The lacustrine sedimentary records of coal-burning atmospheric pollution

    Based on the studies on diatom, ostracods and magnetism on a core acquired from lacustrine sediments, as well as correlation analysis between concentration of acid diatom and the instantaneous lowest pH value, the processes of environment evolution in Lake Yangzonghai were reconstructed. The lacustrine environment was favorable in the 1950s, and began to be polluted by a coal-burning power plant since 1960. During 1965-1980, the instantaneous lowest pH value of lake water decreased to 5-6 when heavily polluted. There was a decrease trend in the pollution from 1983 to 1999, but coal-burning atmospheric pollution was still a main problem for environmental retrieving. As acid precipitated, acid-tolerant species overspread, and shellfish disappeared, as well as ferromagnetic particulates dissolved because of the consequent change of pH-Eh values in the interface of water and soil, which results in the change of environmental proxies versus depth. Thus, the environmental evolution of Lake Yangzonghai is reconstructed in this paper based on the inferences mentioned above....

    2020-06-12 16:16:52瀏覽:1413 atmosphericpollutionproxiesEnvironmentalreconstructionlacustrinesediment

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