diffusion n. 1.散布,發(fā)散。 2.傳播,普及。 3.冗長。 4.【化學】滲濾。 5.【物理學】擴散,漫射。 the diffusion of knowledge 知識的傳播。 diffusion of speech 演說的冗長。 diffusion of light 光線的漫射。
Abstract : in this paper , we make a study on sampling interval revision of atmospheric diffusion parameter in concentration prediction of atmospheric environmental impact assessment 文摘:就大氣環(huán)境影響評價濃度預測中,對大氣擴散參數(shù)取樣時間訂正問題進行了說明和討論。
To calculate the diffusion parameters in theory, the fick second law is used . the calculational results provide valid evidence for determining the nitriding time . the reason for which causes the difference between the real results and the theoretical calculation is analyzed 運用fick第二定律,從理論上計算了擴散參數(shù),為確定氮化時間提供了依據(jù),并對造成實際結(jié)果和理論計算之間差距的原因進行了分析。
2 ) from the analysis of the aerodynamic parameters and turbulent flux transfer under different synoptic conditions we achieve the conclusion that on sands raising and sandstorm days turbulent momentum and sensible-heat fluxes are important exchange factors in the boundary layer, with turbulent exchange stronger in sandstorm weather than both on fine and sand raising days . prior to the occurrence of such an event, in particular, the super-adiabatic instability in the near-surface boundary will reinforce sandstorm weather condition . 3 ) atmospheric turbulent diffusion parameters z and y have apparent daily variation 沙塵天氣下以親地殼元素為主的氣溶膠元素濃度均高于背景大氣和浮塵天氣,而且沙塵天氣強度愈強,元素濃度的增加愈顯著;背景大氣、浮塵天氣條件下親地殼元素的濃度一般在10~(-1)10~0gm~3量級,揚沙、沙塵暴時一般達10~1gm~3量級,特強沙塵暴時高達10~2gm~3量級。
After the batch tests, geotechnical characteristics of cation contaminated clay are studied . it is found that adsorbed cation can induce significant changes in the mechanical properties of clay . : to determine diffusion parameters of cations through clay, some laboratory tests are carried, out via horizontal and vertical diffusion tests 在粘土吸附性的基礎(chǔ)上,對粘土吸附污染物離子后的基本土工特性(塑性、滲透性、強度等)進行試驗研究,總結(jié)了粘性土在滲濾液的長期作用下其土工特性的變化趨勢。
The contents of this paper include the following several aspects : ( 1 ) a model of the fractures leakage is built through counting and analyzing the wealthy geological records of hae field, and a model of the fracture water transporting is also built according to the fracture water condition of its recharge and its runoff and its discharge in hae field; ( 2 ) this paper studies the chemical behavior and the migration parameters of the elenent sr2 + in ground water in hae field, the main contents include : the presence form of the element sr in ground water is analyzed by way of the rmodynamics; the absorption mechanism that granite and sand stone absorbs sr element is analyzed based on theory and experiment test the diffusion parameters of the element sr in water and in granite and in sand stone are researched with laboratory experiment test; the partition coefficient of sand stone and granite to sr is tested by the batch way 其研究內(nèi)容包括以下幾個方面:(1)通過對我國hae預選處置場豐富地質(zhì)資料的大量統(tǒng)計和分析,建立了該處置場的基巖裂隙滲透模型。再根據(jù)hae預選處置場基巖裂隙水的補給、徑流、排泄條件及水位動態(tài)特征,建立了預選處置場基巖裂隙水水運動模型。(2)對高毒性鍶元素在我國hae預選處置場地下水中的化學行為和遷移參數(shù)進行系統(tǒng)的研究,其中主要包括運用熱力學方法分析了鍶元素在地下水中的存在形態(tài),利用理論分析與實驗測試相結(jié)合的方法分析了花崗巖和砂巖對核素鍶的吸附機制,采用室內(nèi)實驗裝置研究了核素鍶在地下水中的擴散參數(shù)以及在花崗巖和砂巖中的本征擴散參數(shù),采用靜態(tài)批式法研究了鍶在砂巖和花崗巖中的分配系數(shù)。
Dilution and dispersion in constant horizontal flow and bottom multi-port discharging was studied in accordance with the hydraulic model test . the influence of diffusion parameters ( jet angle, jet velocity, number of nozzle, riser space ) and environmental parameters ( water depth, water velocity ) on dilution were analyzed . the experimental results show that environmental parameters have prominent effects on wastewater dilution and dispersion, in addition to that, diffuser design parameters have significant influence on wastewater dilution and dispersion . for bailonggang outfall zone, jet angel is 10 or so, nozzle number is 16 or so 借助于人工模型試驗,分析了恒定橫流底部多孔排放時擴散器設(shè)計參數(shù)(射流角度、射流速度、噴口個數(shù))、上升管間距)及環(huán)境參數(shù)(環(huán)境水深、環(huán)境流速)對污水近區(qū)稀釋擴散效果的影響,實驗結(jié)果表明,除了環(huán)境條件對污水稀釋擴散效果影響明顯之外,擴散器設(shè)計參數(shù)對污水的近區(qū)稀釋擴散也有顯著的影響,針對白龍港排放口水域,噴口射流角度宜控制在10左右,噴口個數(shù)取16個