连铸方坯热送过程中的温度梯度

以唐钢棒材厂现有热装热送工艺中的连铸方坯为研究对象,考虑了带与不带保温罩两种热送条件,结合辐射和对流的复合边界条件,对铸坯在热送过程中的温度梯度的变化进行了计算机模拟与解析,所得结果与实测符合得较好.利用本研究定量给出的铸坯在热送过程中保温罩的保温效果及其断面上温度梯度的变化,对减少铸坯热送过程中的热损失、提高热装温度具有重要的参考价值.     

热送热装工艺中连铸板坯保温过程传热模型研究

建立了热送热装工艺中连铸板坯保温过程传热数学模型及下线坯冷却过程传热数学模型 ,并对计算结果进行了验证 ,证明模型可用于预报不同操作条件下铸坯在保温坑保温过程及下线冷却过程中温度变化和热状态 ,给出连铸板坯出保温坑时的温度分布 ,为连铸板坯热送热装炉提供温度查询依据 保温坑有明显的保温作用 ,但保温时间不应超过 1 0h,缩短铸坯在保温坑内的传搁时间和尽可能使坑盖保持关闭状态是提高热送温度的有效手     

连铸方坯热送过程中的温度梯度

以唐钢棒材厂现有热装热送工艺中的连铸方坯为研究对象，考虑了带与不带保温罩两种热送条件，结合辐射和对流的复合边界条件，对铸坯在热送过程中的温度梯度的变化进行了计算机模拟与解析，所得结果与实测符合得较好。利用本研究定量给出的铸坯在热送过程中保温罩的保温效果及其断面上温度梯度的变化，对减少铸坯热送过程中的热损失、提高热装温度具有重要的参考价值。     

连铸小方坯传搁过程温降实验研究

结合长治钢铁公司热送热装实践,对连铸小方坯在空气中与在保温车中的温度变化进行了实测,得出了各种传送方式的温度变化曲线,并对温降模型计算结果进行了验证.     

K 16Mn连铸坯热装炉轧制对轧材组织性能影舷

采用高温固溶加热法,在φ300轧机上模拟现场连铸坯热装炉轧制工艺,分别考察了K16Mn钢不同热装温度和开轧温度对轧材组织性能的影响.结果表明,热装轧制和常规冷装轧制屈服、抗拉强度相当,热装轧制成品塑性、韧性均较好.热装轧制工艺对K16Mn钢组织的影响,随着热装温度的提高,轧前奥氏体晶粒变得粗大,并且轧后组织混晶程度提高.这可通过提高开轧温度,首道次采用大压下量促使铸坯发生完全再结晶来消除.从而细化晶粒.改善成品组织性能.     

连铸方坯感应补热过程的有限元模拟

根据电磁感应理论及传热基本原理，利用ANSYS对连铸方坯的感应补热过程进行了多物理场耦合的有限元模拟；对铸坯断面上的温度梯度、磁场分布、铸坯在感应器内的吸收功率等进行了分析，所得结果与实测符合的较好，从而对“热送直礼”新工艺的开发与应用提供了重要参考依据。     

连铸方坯感应补热过程的有限元模拟

根据电磁感应理论及传热基本原理,利用ANSYS对连铸方坯的感应补热过程进行了多物理场耦合的有限元模拟;对铸坯断面上的温度梯度、磁场分布、铸坯在感应器内的吸收功率等进行了分析,所得结果与实测符合的较好,从而对"热送直轧"新工艺的开发与应用提供了重要参考依据.     

K16Mn 连铸坯热装炉轧制对轧材组织性能影响

采用高温固溶加热法，在３００轧机上模拟现场连铸坯热装炉轧制工艺，分别考察了Ｋ１６Ｍｎ钢不同热装温度和开轧温度对轧材组织性能的影响．结果表明，热装轧制和常规冷装轧制屈服、抗拉强度相当，热装轧制成品塑性、韧性均较好．热装轧制工艺对Ｋ１６Ｍｎ钢组织的影响，随着热装温度的提高，轧前奥氏体晶粒变得粗大，并且轧后组织混晶程度提高．这可通过提高开轧温度，首道次采用大压下量促使铸坯发生完全再结晶来消除，从而细化晶粒，改善成品组织性能．     

热送直轧过程中感应线圈壁厚对补热效率的影响

根据电磁感应和热传导理论,针对线圈壁厚对系统效率的影响,利用ANSYS对连铸坯在感应补热过程中多物理场的耦合问题进行了有限元解析与模拟,定量化地得到线圈壁厚对热效率的影响规律,发现感应线圈壁厚为3 mm时,感应器的热效率最高;感应线圈壁厚对铸坯补热后的断面温度及其分布无影响。这对感应补热装置的设计及热送直轧工艺的实施提供了重要的参考依据。     

热送直轧过程中感应线圈壁厚对补热效率的影响

根据电磁感应和热传导理论,针对线圈壁厚对系统效率的影响,利用ANSYS对连铸坯在感应补热过程中多物理场的耦合问题进行了有限元解析与模拟,定量化地得到线圈壁厚对热效率的影响规律,发现感应线圈壁厚为3 mm时,感应器的热效率最高;感应线圈壁厚对铸坯补热后的断面温度及其分布无影响.这对感应补热装置的设计及热送直轧工艺的实施提供了重要的参考依据.     

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.     

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.     

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.     

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.     

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.     

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.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-