钒钛烧结料床竖向不均匀烧结

通过对钒钛烧结料床的不同料层进行测温,研究了不同深度烧结料成矿过程的温度变化曲线,利用火焰前锋速度和成矿前锋速度两个参数评价了台车竖向烧结的不均匀程度.结果表明:随着料层深度的增加,火焰前锋和成矿前锋迁移速度下降,说明台车下部料床的结构变化大,烧结透气性恶化;加强偏析布料效果,增大台车下部料粒的平均粒度和热态强度,对提高钒钛矿烧结利用系数至关重要.同时,对不同深度处的烧结矿进行矿相分析表明,钒钛烧结矿由磁铁矿、赤铁矿、铁酸钙、硅酸钙、钙钛矿和玻璃相六种主要矿物组成,随着料层深度的增加,磁铁矿、硅酸钙和钙钛矿含量增多,铁酸钙和赤铁矿含量下降.     

合理垂直烧结速度的研究

通过考查气流速度的变化研究垂直烧结速度随烧结过程的变化规律。结果表明:垂直烧结速度并非固定不变,而是随着烧结过程的逐步进行发生显著变化;点火保温后,随烧结物理化学反应的进行,燃烧带逐渐形成并变宽且产生过湿现象,导致料层的透气性显著变差,烧结速度显著下降,直至约25 min后过湿层完全消失,透气性变好,烧结速度迅速上升。根据垂直烧结速度变化规律,通过改变负压烧结,进行烧结速度优化实验,结果表明:在保持转鼓强度及成品率基本不变的情况下,将垂直烧结速度由20.08 mm/min提高到21.82 mm/min,利用系数由1.401 t/(m2-h)提高到1.587 t/(m2-h)。     

铁矿烧结中燃料合理分布研究

以我国某钢铁公司烧结原料为对象,对烧结过程的自动蓄热热平衡进行分析和计算,提出料层蓄热及燃料合理分布的计算模型,并按3层进行燃料分层布料烧结试验.计算结果表明,当料高为600 mm时,烧结各料层可利用蓄热率为35%左右;当焦粉配加量上层、中层和下层分别为4.9%,4.3%和3.4%时,在不降低烧结矿产质量的同时,固体燃耗降低3.69 kg/t.     

平行气流真菌孢子释放强度试验研究

真菌是室内环境中普遍存在的空气微生物污染物,可对人体产生许多危害.采用自行开发的平行气流真菌孢子释放强度测定装置(PAFST),测量了5种典型风速下,4种常见真菌孢子柑桔青霉(Penicillium citrinum)、扩张青霉(Penicillium expansum)、黑曲霉(Aspergillus niger)和枝孢属(Cladosporium Spp.)在3种材料表面的释放强度.结果表明气流的作用形式是影响孢子释放强度的主要因素;在琼脂表面,风速0.9m/s时,柑桔青霉的释放强度为(7±9)个/cm2;枝孢属在风速4.7m/s时,释放强度为(50±35)个/cm2;在无纺布表面柑桔青霉和扩张青霉的最小释放气流速度是0.3m/s,黑曲霉是2.4m/s,枝孢属为9.4m/s;当达到孢子释放最大强度时,风速增加释放强度将不再增大.     

水平和下旋气流对初始气溶胶运动的影响

该文考虑液滴的碰撞和破碎以及水平和下旋气流的影响,采用离散相模型对空中释放的气溶胶云团在开放空间中的气液两相流流场进行仿真,获得气溶胶颗粒群的运动规律,并进行了实验验证。由仿真模拟和实验可知,在水平和下旋气流速度均较小(小于1 m/s)、喷射角度大于30°、初始粒径为100μm、喷射速度约为80 m/s时,释放形成的气溶胶颗粒在短时间内可沉降至地面附近;当水平气流速度增大至3 m/s时,同样条件下释放的气溶胶颗粒更容易在空气中悬浮,不易沉降至地面。在上述两种情况下,喷射角度和下旋气流速度越大,气溶胶颗粒越容易沉降至地面附近。     

600MW机组锅炉省煤器出口后包覆管磨损分析

采用三维模型对600 MW锅炉内部气固两相流场进行模拟,研究锅炉烟道烟气流场分布、飞灰运动和浓度分布等因素对烟道尾部锅炉管束的磨损的影响.根据模拟分析的结果,提出相应的防磨优化措施.研究结果表明,受附壁效应的影响,后包覆管处靠近后墙和侧墙的烟气中飞灰浓度较大,同时,由于烟道尾部气流通道变窄,气流速度增大,使颗粒在后包覆管上碰撞速度增大,管束上方气流速度最大值达到15 m/s,而颗粒在管束上碰撞最大速度也超过10 m/s,因此,引起后包覆管处磨损速率较大,第1层管束较大面积内磨损速率达到1 mm/a,最大值达到3 mm/a.     

基于主动红外入侵探测的在室人数测试方法

在室人数与建筑用能系统紧密相关，实时在室人数的监测是建筑用能行为方向的热点问题之一。红外传感是现有研究方法中应用较广泛的方法，其测试精度与安装高度、人员通过速度及人员体型等因素有关，选取主动红外入侵探测器，依据建筑室内人员活动情况，研究了安装高度、通过速度及人员体型对在室人数测试精度的影响。研究结果表明，考虑各种人员体型及通过速度时，测试精度随安装高度的降低先升高后降低。通过速度越慢，测试精度越高，当v≥1.4 m/s时，测试精度低于60%；当1.0 m/s≤v<1.4 m/s时，测试精度为70%～81%；当v<1.0 m/s时，测试精度高于95%，当v<0.8 m/s时，测试精度达到100%等。被测人员的身高和体重指数（BMI）均与测试精度呈强正线性相关。通过不同工况分析，提出了应用于实际场景的综合精度估算方法。     

B_4C粉末的气流粉碎及烧结

采用气流粉碎对B4C粗粉 (比表面积为 0 5 2m2 g,中位粒度为 2 0 4μm)进行粉碎实验 ,研究了气流粉碎次数对粉末性能、压坯密度和烧结密度的影响及成形压力和烧结温度对B4C烧结密度的影响 .研究结果表明 :当粉碎次数达到 3次后 ,可获得中位粒度小于 1μm的B4C超细粉末 ;经过 4次气流粉碎的B4C超细粉末 ,其比表面积为2 5 3m2 g ,中位粒度为 0 5 6 μm ;该粉末于 2 2 5 0℃无压烧结 1h ,其烧结密度为 2 0 7g cm3 ,达到理论密度的82 .5 % ,平均晶粒粒度为 5 0 μm .可见 ,气流粉碎能改善B4C的烧结性 .     

矿热炉塌料过程中烟尘扩散的数值模拟

以铁合金生产车间为研究对象,利用Fluent软件对车间内矿热炉生产过程中塌料事故的烟尘扩散规律进行非稳态的数值模拟.对连续相和离散相,分别采用标准k～ε模型和DPM模型,分析不同风速和风向的烟尘扩散规律.研究结果表明:当风速在2 m/s以下时,南风能更有效地排除烟尘,并且风速越大,清洁作用越明显;当塌料事故结束时,不论何种风速或风向,车间内烟尘污染面积达到最大;在300 s且无风时最大烟尘质量浓度是风速为4 m/s时的36.6倍;车间内的死角是烟尘最难排出的地方,北风风速为0.2 m/s的最大停留时间长达4 800 s.     

基于FLUENT的含硫天然气泄漏数值模拟研究

为了研究天然气输送管道发生泄漏后气体的扩散规律,以长庆油田第五采气厂输送管道为研究对象,利用FLUENT软件进行数值计算。根据现场的实际情况,建立了数值模拟的物理模型,设置合理的边界条件,得到了不同风速下天然气扩散规律。结果表明:在静风条件下,气体的浓度和速度分布基本上呈对称分布。在风力的作用下,气体的浓度场向下风向发生了明显的偏斜,当风速为3 m/s时,喷射气流大约在泄漏口上方50 m处发生偏斜,当风速为5 m/s时,喷射气流大约在泄漏口上方35 m处发生偏斜,当风速为10 m/s时,喷射气流大约在泄漏口上方15 m处发生偏斜,而且随着风速的增大,射流偏离竖直方向角度也增大。同时风速越大,硫化氢对人体有危害的面积越小。     

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.