海藻液体肥肥效的研究   总被引：3，自引：0，他引：3  

王云峰  石伟勇  潘超君 《海洋学研究》2001,19(3):43-47

采用由碱解法和酶解法制得的海藻液体肥 ,在蔬菜作物上进行浸种和叶面喷施试验 ,结果表明 :海藻液体肥能显著提高种子的发芽率 ,促进作物的生长发育 ,提高作物产量。用海藻液体肥浸种 ,可使种子的发芽率提高 1 0 %左右 ,将其用于叶面喷施 ,则可使作物增产 1 0 %～2 0 %。  相似文献   

Ionic Strength Dependence of Rare Earth – NTA Stability Constants at 25°C     

Biqiong Li  Robert H. Byrne 《Aquatic Geochemistry》1997,3(2):99-115

Observations of competitive complexation of NTA by Cu2+ and rare earth element (REE) ions are used to determine REE-NTA stability constants at ionic strengths between 0.1 and 5.0 molar. Although REE stability constants change markedly with ionic strength, differences in the ionic strength dependence of REE-NTA stability constants across the rare earth element series are small. The ionic strength dependence of log1 for Y and REEs with NTA at 25 °C can be described as: log1(M) = log1(M)0 - 9.198 I1/2/(1+B I1/2)+C I + D I3/2, where 1(M) = [MNTA°][M3+]-1[NTA3-]-1, I is ionic strength, B = 1.732, C = 0.1596, D = 0.0816, and log1(M)° is the metal-NTA stability constant at zero ionic strength.  相似文献   

Plateau typeE(%)- pH curves of interfacial exchange between liquid and solid in seawater     

Zhang Zhengbin  Yang Changchun  Liu Liansheng 《中国海洋湖沼学报》1992,10(2):156-167

A study on the curves of the exchange ratioE(%)- pH on the liquid-solid interface of the systems Zn (II) with clay minerals, (Kaolinite, illite and montmorillonite), Zn (II) with hydrous ferric oxides (amorphous ferric oxide, geothite and hematite), Zn (II) with hydrous manganese oxide (γ-MnOOH, manganite and δ-MnO₂) etc. in seawater resulted in the discovery of new plateau type exchange ratioE(%)-pH curves not yet reported in literature. The two factors that decide the growth, decline and the change of the “plateau type” curve are: (1) the inherent characteristics of systems, which can be explained by the exchange constants (i=1, 2, 3, etc.) of interfacial stepwise ion/coordination particle exchange between liquid and solid; and (2) . The theory of interfacial stepwise ion/coordination particle exchange in seawater was applied to explain the experimental results of the above study and a general formula was derived for the plateau type exchange ratioE(%)-pH curves. The theoretically simulated and calculated curves coincided well with the experimental results. This paper provides new and powerful experimental basis to support the theory of interfacial stepwise ion/coordination particle exchange in seawater. The project was supported by the National Natural Science Foundation of China.  相似文献   

Parameter estimation and simulation of dependence of constant pressure batch dewatering on initial solids concentration     

Rahul Konnur  Sasanka Raha 《International Journal of Mineral Processing》2007

The problem of predicting dependence of constant pressure batch dewatering of particulate suspensions on feed solids concentration is considered. Scaling transformations which demonstrate that evolution in the cake consolidation stage of dewatering is governed by an underlying self-similar behavior are proposed. The self-similar master curve, which can be obtained using only one set of experimental dewatering data obtained with a feed suspension having solids concentration above the gel point, is employed for estimating dependence of key dewatering process parameters on feed solids concentration. Using the parameter estimates in a Darcy's law based dewatering model, it is shown that the complete evolution of dewatering for a desired feed solids concentration can be predicted with reasonable accuracy. The approach is simpler to implement in comparison to available pressure filtration models, which require several suspension characterization experiments.  相似文献   

对混合土液塑限试验的讨论     

刘福臣  孙玉琢  王启田 《岩土工程技术》2007,21(3):122-122,133

土的液塑限试验是土工试验常见试验之一。含有一定数量粗粒组的混合土,用0.5 mm以下粒径范围的土作液塑限试验,得到的液塑限偏低,由此土的分类定名不符合实际。建议用0.075 mm以下粒径范围的土做液塑限试验。  相似文献   

液塑限联合测定法的若干问题探讨     

殷春娟  崔永高  郑大龙 《上海国土资源》2007,(1):63-66

对液塑限联合测定法数据进行整理,采用基于EXCEL图表处理功能编制的电子表格计算法代替规范作图法,既方便又提高工效。同时对上海滨海平原区土层的液塑限试验合格品的临界相关系数平方值R2进行了探讨,并结合实践分析了上海滨海平原区土层的液塑限相关系数特点。  相似文献   

广义相当位温及其扩展应用   总被引：9，自引：0，他引：9  

符长锋  李任承  赵振东  卢莹 《气象》2006,32(3):11-17

广义相当位温是一个包含水汽和液态水在内的新的大气热力学参量。通过简明推导和论证，进一步讨论其物理意义和扩展应用；结合耗散结构理论，提出了排熵指数的概念；根据广义相当位温自身的特点，设计了大气液态水含量指数和大气水物质含量指数等预报判据；这些参数在强对流天气和区域性暴雨分析预报中，应用效果较好。  相似文献   

A land surface model incorporated with soil freeze/thaw and its application in GAME/Tibet     

HU Heping  YE Baisheng  ZHOU Yuhua  TIAN Fuqiang 《中国科学D辑(英文版)》2006,49(12):1311-1322

Land surface process is of great importance in global climate change, moisture and heat exchange in the interface of the earth and atmosphere, human impacts on the environment and eco- system, etc. Soil freeze/thaw plays an important role in cold land surface processes. In this work the diurnal freeze/thaw effects on energy partition in the context of GAME/Tibet are studied. A sophisti- cated land surface model is developed, the particular aspect of which is its physical consideration of soil freeze/thaw and vapor flux. The simultaneous water and heat transfer soil sub-model not only reflects the water flow from unfrozen zone to frozen fringe in freezing/thawing soil, but also demon- strates the change of moisture and temperature field induced by vapor flux from high temperature zone to low temperature zone, which makes the model applicable for various circumstances. The modified Picard numerical method is employed to help with the water balance and convergence of the numerical scheme. Finally, the model is applied to analyze the diurnal energy and water cycle char- acteristics over the Tibetan Plateau using the Game/Tibet datasets observed in May and July of 1998. Heat and energy transfer simulation shows that: (i) There exists a negative feedback mechanism between soil freeze/thaw and soil temperature/ground heat flux; (ii) during freezing period all three heat fluxes do not vary apparently, in spite of the fact that the negative soil temperature is higher than that not considering soil freeze; (iii) during thawing period, ground heat flux increases, and sensible heat flux decreases, but latent heat flux does not change much; and (iv) during freezing period, soil temperature decreases, though ground heat flux increases.  相似文献   

Active tuned liquid column damper with propellers     

Yung‐Hsiang Chen  Chia‐Hao Ko 《地震工程与结构动力学》2003,32(10):1627-1638

The active control of a Tuned Liquid Column Damper (TLCD) with two propellers is presented. A single‐degree‐of‐freedom system with a passive or active TLCD is used as an example to set up the basic equation of motion. The Optimal Control Theory is applied to establish the control law and to calculate the control force generated by these two propellers installed inside the TLCD. A simple pendulum‐like model test is carried out to study the dynamic characteristics of the passive and active TLCDs and the effectiveness of the vibrational control. Comparison of the experimental result with the analytical one shows a good agreement. Finally, the analytical results of the seismic response are also included as an example for demonstration and application. Copyright © 2003 John Wiley & Sons, Ltd.  相似文献   

The exsolution of magmatic hydrosaline chloride liquids   总被引：14，自引：0，他引：14  

Jim D. Webster   《Chemical Geology》2004,210(1-4):33-48

Hydrosaline liquid represents the most Cl-enriched volatile phase that occurs in magmas, and the exsolution of this phase has important consequences for processes of hydrothermal mineralization and for volcanic emission of Cl to the atmosphere. To understand the exsolution of hydrosaline liquids in felsic to mafic magmas, the volatile abundances and (Cl/H₂O) ratios of more than 1000 silicate melt inclusions (MI) have been compared with predicted and experimentally determined solubilities of Cl and H₂O and associated (Cl/H₂O) ratios of silicate melts that were saturated in hydrosaline chloride liquid with or without aqueous vapor in hydrothermal experiments. This approach identifies the minimum volatile contents and the values of (Cl/H₂O) at which a hydrosaline chloride liquid exsolves from any CO₂- or SO₂-poor silicate melt. Chlorine solubility is a strong function of melt composition, so it follows that Cl solubility in magmas varies with melt evolution. Computations show that the (Cl/H₂O) ratio of residual melt in evolving silicate magmas either remains constant or increases to a small extent with fractional crystallization. Consequently, the initial (Cl/H₂O) in melt that is established early during partial melting has important consequences for the exsolution of vapor, vapor plus hydrosaline liquid, or hydrosaline liquid later during the final stages of melt ascent, emplacement, and crystallization or eruption. It is demonstrated that the melt (Cl/H₂O) controls the type of volatile phase that exsolves, whereas the volatile abundances in melt control the relative timing of volatile phase exsolution (i.e., the time of earliest volatile exsolution relative to the rate of magma ascent and crystallization history).

Comparing melt inclusion compositions with experimentally determined (Cl/H₂O) ratios and corresponding volatile solubilities of hydrosaline liquid-saturated silicate melts suggests that some fractions of the eruptive, calc-alkaline dacitic magmas of the Bonnin and Izu arcs should have saturated in and exsolved hydrosaline liquid at pressures of 2000 bars. Application of these same melt inclusion data to the predicted volatile solubilities of Cu-, Au-, and Mo-mineralized, calc-alkaline porphyritic magmas suggests that the chemical evolution of dioritic magmas to more-evolved quartz monzonite compositions involves a dramatic reduction in Cl solubility that increases the probability of hydrosaline liquid exsolution. The prediction that quartz monzonite magmas should exsolve a hydrosaline chloride liquid, that is potentially mineralizing, is consistent with the general observation of metal-enriched, hypersaline fluid inclusions in the more felsic plutons of numerous porphyry copper systems. Moreover, comparing the volatile contents of melt inclusions from the potassic, alkaline magmas of Mt. Somma-Vesuvius with the predicted (Cl/H₂O) ratios of hydrosaline liquid-saturated melts having compositions similar to those of the volatile-rich, alkaline magmas associated with the orthomagmatic gold–tellurium deposits of Cripple Creek, Colorado, suggests that hydrosaline chloride liquid should have exsolved at Cripple Creek as the magmas evolved to phonolite compositions. This prediction is consistent with the well-documented role of Cl-enriched, mineralizing hydrothermal fluids at this major gold-mining district.  相似文献