菱锰矿与石英浮选行为及其机理研究

研究了十二胺对菱锰矿与石英分离的浮选行为,以及调整剂水玻璃和六偏磷酸钠对菱锰矿和石英浮选的影响.结果表明,在pH=7～12时,十二胺对两种矿物都具有良好的捕收性;水玻璃和六偏磷酸钠均抑制石英而活化菱锰矿.人工混合矿浮选表明,在pH=7时六偏磷酸钠为调整剂,菱锰矿与石英可浮性相当,不可分离.紫外分光光度法结果表明,Mn2+在pH=7时可与石英发生静电吸附.红外分析结果显示,水玻璃可吸附于石英和菱锰矿表面,六偏磷酸钠可吸附于菱锰矿表面.     

烷基羟丙基胺作用下石英和赤铁矿的浮选行为

通过浮选试验研究了新型捕收剂烷基羟丙基胺(NDIA)作用下石英和赤铁矿的浮选行为,并结合量子化学计算和zeta电位分析,考察了该捕收剂在矿物表面的吸附机理.单矿物浮选试验结果表明:当捕收剂用量为33.33 mg/L,p H值为4.50~8.00时,石英的回收率在92%以上,赤铁矿的回收率在50%左右.人工混合矿分选试验结果表明:当捕收剂用量为33.33 mg/L,淀粉用量为13.33 mg/L,p H值为4.50~8.00时,NDIA均可实现石英和赤铁矿的有效分离.量子化学计算结果表明,与十二胺相比,NDIA对石英具有更好的捕收性能.zeta电位测试结果表明:NDIA在石英和赤铁矿表面均发生了吸附,且在石英表面的吸附作用强于赤铁矿.     

十二胺体系中异极矿浮选行为的研究

以十二胺为捕收剂,通过单矿物浮选试验对异极矿的可浮性及正辛醇对异极矿可浮性的影响进行了初步研究.结果表明,当pH值在10~11范围内,适量的十二胺对未经活化的异极矿具较好的捕收性;正辛醇对异极矿不具有捕收性.正辛醇能够强化十二胺阳离子在异极矿表面的吸附,降低十二胺的浮选起始浓度;当正辛醇以25%的物质的量比取代十二胺组成胺醇复合捕收剂时,使用复合捕收剂可获得与使用十二胺相同的浮选效果.     

十二胺体系中异极矿和菱锌矿的浮选行为

通过单矿物浮选试验对异极矿和菱锌矿在十二胺体系中的浮游性进行了研究.浮选试验结果表明,异极矿的可浮性高于菱锌矿,当pH值在10~11范围内,十二胺对两种矿物的捕收性最好.溶液化学计算和zeta电位测试结果表明,十二胺主要通过静电作用吸附在异极矿和菱锌矿表面,十二胺分子和十二胺阳离子之间的缔合作用能够增强十二胺对两种矿物的捕收能力.zeta电位测试、XPS测试和溶液化学计算的结果表明,异极矿的零电点低于菱锌矿的零电点.第一性原理计算和接触角测试的结果表明,异极矿的疏水性大于菱锌矿.     

硅藻土、钠长石及石英的可浮性研究

实验考察了十二胺对硅藻土、钠长石、石英的捕收能力.通过ζ-电位、红外光谱检测对十二胺与硅藻土、钠长石、石英的作用机理进行了分析.浮选实验结果表明,pH为5.5~10.5,十二胺浓度为2.38×10-4mol/L时,钠长石和石英单矿物浮选回收率分别在92%和97%以上,而硅藻土的回收率在5%以下.ζ-电位分析结果表明,pH为5.5~10.5时,十二胺在钠长石和石英表面的吸附明显强于在硅藻土表面的吸附,这与浮选结果一致.红外光谱分析结果表明,pH为5.5时,十二胺在硅藻土、钠长石、石英表面均存在物理吸附、氢键作用,且在硅藻土表面的吸附强度相对弱,导致其可浮性差.     

硅藻土、钠长石及石英的可浮性研究

实验考察了十二胺对硅藻土、钠长石、石英的捕收能力.通过ζ-电位、红外光谱检测对十二胺与硅藻土、钠长石、石英的作用机理进行了分析.浮选实验结果表明,pH为55～105,十二胺浓度为238×10-4mol/L时,钠长石和石英单矿物浮选回收率分别在92%和97%以上,而硅藻土的回收率在5%以下.ζ-电位分析结果表明,pH为55～105时,十二胺在钠长石和石英表面的吸附明显强于在硅藻土表面的吸附,这与浮选结果一致.红外光谱分析结果表明,pH为55时,十二胺在硅藻土、钠长石、石英表面均存在物理吸附、氢键作用,且在硅藻土表面的吸附强度相对弱,导致其可浮性差.     

石英浮选的新型捕收剂--N-十二烷基-β-氨基丙酰胺

研究了一种新的浮选石英的捕收剂--N-十二烷基-β-氨基丙酰胺(即DAPA)的浮选性能和作用机理.浮选试验结果表明:在pH=6.5～8.5,DAPA的质量浓度为12.5 mg/L的条件下对细粒石英的浮选回收率最大,可达到92%以上;与十二胺相比,DAPA对石英的捕收能力较弱,对石英与赤铁矿选择性较强且DAPA不受水中Ca2 和Mg2 的影响;Fe3 可抑制石英的可浮性,当Fe3 的质量浓度增加到16.70 mg/L时,石英浮选完全被抑制,但是,通过添加一定量的草酸可完全消除这种影响;DAPA分子中有2个极性部分,即仲胺基和酰胺基,而位于分子端部的酰胺基是比氨基碱性弱的碱性基团,它吸附石英后,石英表面的负电性变小,所以,DAPA仍属于阳离子类捕收剂.     

变性淀粉在赤铁矿阳离子反浮选脱硅中的抑制性能

以十二胺为捕收剂,木薯原淀粉、取代度为0.026和0.21的羧甲基淀粉和取代度为0.0065和0.055的磷酸酯淀粉作为抑制剂,考察了赤铁矿与石英的可浮性,重点研究了基团取代度对变性淀粉抑制性能的影响.结果表明:原淀粉、取代度0.026的羧甲基淀粉和取代度0.0065的磷酸酯淀粉对赤铁矿有良好的抑制作用,而取代度0.21的羧甲基淀粉和取代度0.055的磷酸酯淀粉对赤铁矿的抑制能力较弱;原淀粉和取代度0.026的羧甲基淀粉对石英有较强抑制作用,其他3种淀粉对石英抑制能力较弱.可见,低取代度的磷酸酯淀粉,在赤铁矿阳离子反浮选脱硅中可作为较高选择性的抑制剂.Zeta电位测定结果表明,特征基团取代度相对较高的变性淀粉,与赤铁矿和石英作用后,矿物Zeta电位负值较大.变性淀粉的取代度越高,其伸展向溶液中荷负电的基团越多,使阳离子捕收剂通过静电作用吸附于矿物表面,减弱了变性淀粉的抑制能力.     

硼镁石浮选特性研究

通过对硼镁石单矿物纯度、粒度、表面特性的测试以及单矿物的浮选试验,研究了六偏磷酸钠对磁铁矿、硼镁石和蛇纹石单矿物的可浮性影响.结果表明,在油酸体系中,六偏磷酸钠的浓度小于0.25×10-4mol/L时可抑制磁铁矿,浓度增大后对磁铁矿抑制作用减弱;在十二胺体系中,六偏磷酸钠的浓度小于0.8×10-4mol/L时对磁铁矿抑制作用不大,浓度增大后抑制作用明显.六偏磷酸钠在油酸体系中,对硼镁石具有抑制作用,在十二胺体系中,对硼镁石没有抑制作用.六偏磷酸钠在油酸浮选体系和十二胺体系中,对蛇纹石可浮性的影响都不明显.同时,对淀粉和Ca2+对硼镁石的抑制作用也进行了探讨.     

烷基磺酸钠浮选冀东司家营赤铁矿的作用机理

冀东司家营赤铁石英岩矿石的正浮选小型试验和半工业试验,已获得良好结果。为进一步探索提高指标的途径,本研究课题进行了烷基磺酸钠对假象赤铁矿的作用机理以及与矿物可浮性的关系等方面的研究。冀东司家营北区浅部的赤铁矿,是以假象、半假象为主。主要脉石矿物为石英。假象赤铁矿的零电点(PZC)经测定为PH5.8,石英的零电点为PH2.2。烷基磺酸钠对假象赤铁矿的吸附存在着三个高峰:一个峰在PH3左右,主要是物理吸附并伴随着药剂离子的疏水性缔合。另一个峰在赤铁矿的零电点附近,是一个化学吸附峰。第三个峰在PH12左右,这是由于赤铁矿表面阳离子水解,在溶液中生成氢氧化铁Fe(OH)_3悬浮物,显著增大了吸附面积所造成的假象吸附。这三个吸附峰的存在,对假象赤铁矿是有普遍的意义。在没有阳离子的活化作用时,烷基磺酸钠对石英的扑收作用甚微。在浮选赤铁石英岩矿石时,要注意铁离子所起的特殊作用:一方面,烷基磺酸钠的阴离子吸附于赤铁矿表面时,铁离子的存在是一个重要条件;一方面,在一定的PH值范围内,铁离子又有活化石英的作用。据此,以磺酸盐为扑收剂浮选假象赤铁矿时,存在着两个可供选择的浮选区:一个在假象赤铁矿的零电点附近,一个在PH3左右。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.