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11.
Construction and demolition waste has been dramatically increased in the last decade, and social and environmental concerns on the recycling have consequently been increased. Recent technology has greatly improved the recycling process for waste concrete. This study investigates the fundamental characteristics of concrete using recycled concrete aggregate (RCA) for its application to structural concrete members. The specimens used 100% coarse RCA, various replacement levels of natural aggregate with fine RCA, and several levels of fly ash addition. Compressive strength of mortar and concrete which used RCA gradually decreased as the amount of the recycled materials increased. Regardless of curing conditions and fly ash addition, the 28 days strength of the recycled aggregate concrete was greater than the design strength, 40 MPa, with a complete replacement of coarse aggregate and a replacement level of natural fine aggregate by fine RCA up to 60%. The recycled aggregate concrete achieved sufficient resistance to the chloride ion penetration. The measured carbonation depth did not indicate a clear relationship to the fine RCA replacement ratio but the recycled aggregate concrete could also attain adequate carbonation resistance. Based on the results from the experimental investigations, it is believed that the recycled aggregate concrete can be successfully applied to structural concrete members. 相似文献
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介绍了淮安市盐化工业的现状、地表水中氯化物污染的现状及其污染的来源和危害,并根据淮安市盐化工业的发展趋势,提出污染防治措施. 相似文献
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CODcr测定中硫酸汞去除氯离子干扰的探讨 总被引:1,自引:0,他引:1
通过对经硫酸汞络合后的含氯样品CODcr的测定,指出了硫酸汞与氯离子的量为20: 1时,对氯离子能达到较好的屏蔽效果,使干扰程度降到较低水平。 相似文献
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Diffusion coefficients (T=23±2 °C) and accessible porosities for HTO, 36Cl− and 125I− were measured on Opalinus Clay (OPA) samples from the Mont Terri Underground Rock Laboratory (URL) using the through-diffusion technique. The direction of transport (diffusion) was perpendicular to bedding. Special cells that allowed the application of confining pressure were designed and constructed. The pressures ranged from 1 to 5 MPa, the latter value simulating the overburden at the Mont Terri URL (about 200 m). The test solution used in the experiments was a synthetic version of the Opalinus Clay pore water, which has Na+ and Cl− as the main components (I=0.42 M).The measured values of the effective diffusion coefficients (De) and rock capacity factors (α) are: De=1.2–1.5×10−11 m2 s−1 and α=0.09–0.11 for HTO, De=4.0–5.5×10−12 m2 s−1 and α=0.05 for 36Cl− and De=3.2–4.6×10−12 m2 s−1 and α=0.07–0.10 for 125I−. For non-sorbing tracers (HTO, 36Cl) the rock capacity factor α is equal to the diffusion-accessible porosity . The experimental results showed that pressure only had a small effect on the value of the diffusion coefficients. Increasing the pressure from 1 to 5 MPa resulted in a decrease of the diffusion coefficient of 17% for HTO, 28% for 36Cl− and 30% for 125I−. Moreover, the diffusion coefficients for 36Cl− and 125I− are smaller than for HTO, which is consistent with an effect arising from anion exclusion.The diffusion coefficients of HTO and 125I− measured in this study are in good agreement with recent measurements at three other laboratories performed within the framework of a laboratory comparison exercise. The values of the diffusion-accessible porosities show a larger degree of scatter. 相似文献
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建立了流动注射氯化亚锡还原光度法测定水中总磷的方法.改进了氯化亚锡的配制方法,优化了试验条件,方法检出限为0.02 mg/L,精密度与准确度均符合要求.应用该方法测定天然水样,分析速度加快,结果令人满意. 相似文献
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用离子色谱法测定大气中低浓度氯化氢,方法灵敏、准确度高,但测定过程极易受污染干扰.本文主要探讨了在前期准备、采样和分析全过程中应注意的一些问题. 相似文献