磷铵生产中改槽式中和器为管式反应器的试研究

在料浆法磷铵生产中，京改槽式中和器为管式反应器，缩短中和反应时间后，对磷铵产品水溶Ｐ２Ｏ５含量的影响进行了实验与工业装置的试验研究，试验结果表明，采用管式反应器和反应时间缩短到１ｍｉｎ以内，磷铵产品水溶Ｐ２Ｏ５可提高３％以上。这将是提高磷铵产品质量，进行设备技术改造的方向之一。     

磷铵生产中改槽式中和器为管式反应器的试验研究

在料浆法磷铵生产中，就改槽式中和器为管式反应器、缩短中和反应时间后，对磷铵产品水溶Ｐ２Ｏ５含量的影响进行了实验与工业装置的试验研究．试验结果表明，采用管式反应器，中和反应时间缩短到１ｍｉｎ以内，磷铵产品水溶Ｐ２Ｏ５可提高３％以上．这将是提高磷铵产品质量，进行设备技术改造的方向之一．     

国家科技成果重点推广计划项目集锦

编号：T990490该工艺是将传统的重过磷酸钙生产方法与料浆法磷铵生产工艺结合在一起，在湿法磷酸氨中和制取磷铰料浆之前，加人磷矿粉，充分利用含硫酸量较高的湿法磷酸的高位化学能分解磷矿，从而大幅度降低磷铵产品的硫酸单耗（下降5％－15％），同时可降低磷铰产品的氨耗，使磷铰生产成本下降7％，均衡了产品质量，提高了装置的生产能力和控制稳定性，进一步扩大了料浆法磷按工艺的优势。采用该工艺生产磷按，即使以质量较差的磷矿为原料，其硫酸单耗与使用高质量磷矿为原料的传统工艺相当。重庆市南川市维丰化工总公司在3万吨／年磷铰…     

料浆法磷铵生产工艺发展与五大磷肥工程改造

针对引进磷酸浓缩工艺生产磷铵的技术不适应我国矿产资源具体情况的难题，开发了料浆法磷铵生产工艺技术，已在21个省区布点推广建设了87套装置，形成生产能力279×104 t/a的规模，占全国磷铵生产能力的60%。最近在贵州瓮福实施料浆法磷铵与引进的传统磷酸浓缩工艺联产的成功，为五大磷肥工程的改造提供了一条新的途径。     

无堵塞料浆泵的研究与应用项目通过鉴定

无堵塞料浆泵的研究与应用是江苏省“九五”工业重大科技攻关项目,已由我校流体中心完成并于2000年6月25日通过江苏省科技厅组织的科技鉴定研究开发的无堵塞料浆泵产品结构新颖、密封可靠、抗缠绕性能好,料浆的输送浓度高,通过能力强,同时自换性好,选型、配套、使用、检修、调整方便,利于形成批量生产并降低生产成本无堵塞料浆泵系列产品,经机械工业排灌机械产品质量检测中心检测合格,其平均效率比老产品高10%以上,比现行标准ＱＢ/Ｔ1697—93《离心纸浆泵》规定值高5%～10%无堵塞料浆泵运行可靠,安装使用方便,技术指标具有国内领先水平,并达…     

带搅拌装置的管式反应器停留时间分布曲线

设计了一种带有机械搅拌装置的新型管式反应器.用NaCl溶液做示踪剂测定该管式反应器内的停留时间分布(RTD)曲线,并计算了平均停留时间和方差.采用L9(33)正交实验考察了流体在不同搅拌转速、不同流量及不同出口处的平均停留时间和方差.结果表明:该反应器内流体流动状态接近活塞流,平均停留时间随流体流量的增大而减小,随反应器长度的增加而增大,而随转速变化规律性不明显.     

氨酸造粒工艺运行总结

采取新型氨酸管式反应器,使氨酸法工艺发挥最佳运行效果,使产量提高、成本降低,产品质量提升,解决了产品结块、洗涤液回收、现场环境、运行稳定性等一系列问题,达到了预期效果。     

化工大系统的分解及反应器的稳定性理论(综述)

本文介绍了连续搅拌槽反应器(CSTR)、n个CSTR、聚合反应器、管式反应器、具有反应与扩散的开系统反应器等数学模型的建立;静态(奇点)(包括二组分多分子静态的多重性、唯一性)的求解;依李雅普诺夫直接法而论化工反应器系统中稳定性的判定及化工复合系统如具有反应与扩散的开系统,n个CSTR串连及用16个CSTR串连来近似模拟轴向扩散绝热的管式反应器等在稳定性理论中的分解问题的近代发展.     

醋酸乙烯合成复合反应的转化率及收率分析

分析了管式反应器中气相法合成醋酸乙烯的简化反应网络，导出了转化率与收率之间的内在关系，并采用数值方法对此进行了分析，给出了敢相法合成醋酸乙烯管式反应器出口转化率和收率的计算方法。     

压力能驱动的自搅拌反应器流动特性数值模拟

提出了一种新型自搅拌管式反应器,并采用数值模拟方法对新型自搅拌溶出反应器内的流体流动特性进行了研究.在搅拌转速不变的情况下,研究了不同入口流速对反应器内部流体流动的影响.结果表明:不同流速下,反应器内部轴向流速整体分布均匀,但反应器入口和出口的流体,由于受到扰动作用速度偏大,且靠近出口的流速低于入口附近流速.径向靠近壁面处速度稍大,靠近搅拌轴处速度略小,说明搅拌桨叶端部对流体作用更大.入口流速为8.3 m/s时,更利于反应器内环流的形成.     

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。     

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.     

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.