Parameter identification and global sensitivity analysis of Xin’anjiang model using meta-modeling approach

Parameter identification, model calibration, and uncertainty quantification are important steps in the model-building process, and are necessary for obtaining credible results and valuable information. Sensitivity analysis of hydrological model is a key step in model uncertainty quantification, which can identify the dominant parameters, reduce the model calibration uncertainty, and enhance the model optimization efficiency. There are, however, some shortcomings in classical approaches, including the long duration of time and high computation cost required to quantitatively assess the sensitivity of a multiple-parameter hydrological model. For this reason, a two-step statistical evaluation framework using global techniques is presented. It is based on (1) a screening method (Morris) for qualitative ranking of parameters, and (2) a variance-based method integrated with a meta-model for quantitative sensitivity analysis, i.e., the Sobol method integrated with the response surface model (RSMSobol). First, the Morris screening method was used to qualitatively identify the parameters’ sensitivity, and then ten parameters were selected to quantify the sensitivity indices. Subsequently, the RSMSobol method was used to quantify the sensitivity, i.e., the first-order and total sensitivity indices based on the response surface model (RSM) were calculated. The RSMSobol method can not only quantify the sensitivity, but also reduce the computational cost, with good accuracy compared to the classical approaches. This approach will be effective and reliable in the global sensitivity analysis of a complex large-scale distributed hydrological model.     

发展中的越南石油工业

2009年10月18日,CCOP第46届年会在越南头顿(VUNG TAU)召开。会议期间,主办国越南向CCOP成员国展示了前所未有的热情和活力,也使各国参会代表充分了解了不一样的越南和发展中的越南石油工业。近年来,越南的石油工业发展迅速,国际合作项目也接踵而至,在东南亚的发展速度中名列前茅。伴随着越南与我国双方领海争议,越南正日益成为我国在东南亚市场的潜在竞争对手。     

甘肃邓家山铅锌矿床成矿过程中SiO_2地球化学作用的实验研究

以邓家山铅锌矿床中SiO_2参与Pb,Zn成矿作用的地质证据为前提,讨论了不同条件下SiO_2在热液中的溶解度及其迁移形式;通过成矿温压摸拟实验,研究了热液中溶解SiO_2对成矿元素Pb,Zn活化、迁移、沉淀的作用及其机理;指出热液中SiO_2能提高Pb,Zn硫化物的溶解度,增强Pb,Zn的活化能力,同时可改变热液中Zn(Pb)-Cl络合离子分布型式,使得金属离子(Zn~(2+))以相对最稳定的络合形式为主。SiO_2又是热液体系中理想的pH值缓冲剂,能保持热液运移过程中pH的稳定,使金属物质随热液流体作长距离的稳定迁移。当体系物理化学条件改变时,SiO_2发生沉淀,体系pH值升高,金属络合物稳定性降低,金属硫化物随之沉淀,这可能就是大多数热液矿床中矿质和硅质密切伴生的主要原因。     

STUDY ON THE SURFACE ELECTRIC CHARACTERISTICS OF FLAKE GRAPHITE AND THE MECHANISM OF ABSORPTION MEDICAMENT

Abstract: It is of important significance to make studies on the sur-face electric characteristics of flake graphite and their variation law forstrengthening the floatation of flake graphite.In this paper, DPM type microelectrophoresis apparatus is used to de-termine the surface Zeta-potential of flake graphite pure mineral, studythe affection of pulp pH value, seueral kinds of inorganic salt ions andanion surface activation agent (petroleum sodium sulfonate) on flakegraphite surface Zeta-potential,and explore the surface absorption charac-teristics of graphite.The floatation experiment of flake graphite pure mineral shows thatboth the petroleum sodium sulfonate and inorganic salt can strengthen theconventional floatation of flake graphite. The surface characteristic varia-tion caused by them is also an important factor to promote graphite floata-tion.     

PURIFICATION OF KAOLINS BY SELECTIVE DISPERSION AND FLOCCULATION

To fulfill the increasingly higher requirements on thequality of kaolins from industries, the purification of kaolins has becomemore and more important. Kaolins from different mines were studied withthe aim to remove the various impurities. The mineralogical studies on thekaolins indicated that kaolinite and the major gangue minerals in the orewere all very fine. Therefore, it was difficult to separate kaolinite fromthe gangue minerals by conventional mineral processing techniques,such asgravity concentration, magnetic separation and flotation. Techniques forfine particles processing, i. e. selective dispersion and flocculation weretried to purify the kaolins. The experiments were first carried out withpure minerals of kaolinite and the gangue,minerals to study the dispersionand flocculation characteristics of the different mineral suspensions undervarious conditions. The key factors affecting the dispersion and floccula-tion of the minerals in water were the pH of the suspension, the type anddosage of t     

EFFECT OF METAL IONIC SPECIES AT MINERAL SURFACES ON THE ADSORPTION OF CARBOXYMETHYL CELLULOSE

In this research it was shown that mineral surface metal-lic sites played a decisive role in carborymethyl cellulose(CMC) adsorp-tion, and surface hydrophobicity alone did not have significant effects.Both the carboxymethyl groups and the hydroxyl groups of the CMC par-ticipated in the interaction with mineral surface,with the carboxymethylgroups interacting with metal and metal hydroxyl species, and hydroxylgroups interacting with metal hydroxide species,respectively.     

STUDY ON THE OXIDIZABILITY-RESISTANCE OF FLEXIBLE GRAPHITE BY USING ADDITIVE

Abstract: The oxidizability-resistance of graphite products havebeen studied with the addition of H_3PO_4 and H_3BO_3. A available way hasbeen found to increase the oxidizability-resistance of graphite products.The oxidizability-resistance of graphite products rises remarkably aftertreating with 1% H_3PO_4 and 3% H_3BO_3. Meanwhile, the relative princi-ple has been proposed also.     

STUDIES ON THE APPLICATION OF TOWER MILL IN THE PRODUCTION OF ULTRAFINE WOLLASTONITE

The feasibilities of ultrafine wollastonits powder have beenanalysed based on joint considerations of satisfying product size re-quiremet,preserving the needlelike wollastonite structure,maintaining aneasy operation,stable performance and simolified flowsheet,etc.Opti-mum operating conditions have been established through systematic reseach-es on the bases of product requirements.Modern analytical technique suchas light-transmission particle sizing and scanming electron spectroscopyhave been used to determine the size and morphology of the product.It isfound that the meedelelike structure can be preserved even down to the ul-trafine range by using the tower mill.The tower,mill is easy to operate,has stable performances,and can be used in open-circuit to produce re-quired products without needing for a classifier.     

准噶尔盆地中,新生代陆相层序地层学探讨及其应用

根据一级的湖水位升降变化，准噶尔盆地中新生界可以划分为５个层序，有利的储集层位包括低水位体系域，水进体系域的坡折边缘体系域，高水位体系域既是可能是（或现实的）生油层位，也是区域性盖层，二级湖水位的升降变化可以形成有利的岩性圈闭，根据湖水位的升降变化和层序地层学研究，对盆地西北缘中新生界的储集相带作了初步预测。     

一个典型大气降水热液矿床——内蒙古白乃庙金矿成因的稳定同位素证据

对内蒙古白乃庙金矿区矿脉、围岩较系统的氧同位素分析及脉石英包裹体水氢同位素测定结果表明,脉石英的氧同位素δ~(18)O=+4.37～-1.19‰,其包裹体水氢同位素δD=-108.9～-133.8‰。结合其他资料,提出大气降水是本矿区成矿热液的主要组分,而强烈的构造破碎,花岗岩类侵入体的热力驱动及合适的矿源层,使这种热液能够淋滤矿质并在构造有利部位富集成矿。