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通过对金昌冶炼厂排水系统的现状分析,在力求技术可靠、经济合理设计原则下,对工厂的排水系统进行设计,提高全厂水资源的利用率,降低污水排放量,促进了企业的可持续发展。 相似文献
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在《高等数学》教学中培养学生自学能力武汉交通科技大学陈庆虎现代教学论的发展趋势之一，是特别重视培养学生学习能力、主张着力于“教会学生学习”。随着教学改革的深入发展，高等教育正从重教轻学、追求知识向重视自学、培养能力方面转轨。培养学生的自学能力是教学改... 相似文献
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Feynman variational path-integral theory was used to obtain the ground-state energy of a polaron in a quantum well in the
presence of a Coulomb potential for arbitrary values of the electron-phonon coupling constant α. Numerical and analytical
results showed that the energy shift was more sensitive to α than to the Coulomb binding parameter (β) and increased with
the decrease of effective quantum well widthl
Z. It was interesting that due to the electronic confinement in the quasi-2D (quantum well) structures, the lower bound of
the strong coupling regime was shifted to smaller values of α. Comparison of the polaron in the quantum well with that in
the quantum wire or dot showed that the polaronic effect strengthened with decrease of the confinement dimension.
Project (No. 19804009) supported by the National Natural Science Foundation of China 相似文献
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陈庆虎 《铜陵职业技术学院学报》2008,7(1):77-79
目前,我国大多数工业企业认识到技术创新的重要性及建立技术中心的必要性。但对技术创新的有关理论问题及技术中心运行机制理解不一。本文通过技术创新的理论分析,确立企业是技术创新主体、技术中心是提升企业核心竞争力的主‘要组织形式及创新靠市场拉动的观念;对技术中心基本职能及运行机制的理论探讨与实证研究,寻求完善技术中心运行机制的应对措施。 相似文献
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ＩＮＴＲＯＤＵＣＴＩＯＮＴｙｐｅＩＩｓｕｐｅｒｃｏｎｄｕｃｔｏｒｓｉｎａｓｕｆｆｉｃｉｅｎｔｌｙｓｔｒｏｎｇｍａｇｎｅｔｉｃｆｉｅｌｄｃｈａｎｇｅｔｏａｍｉｘｅｄｓｔａｔｅａｎｄａｖｏｒｔｅｘｌａｔｔｉｃｅ (ＶＬ)ｆｏｒｍｓ .Ｔｈｅｉｎｆｌｕｅｎｃｅｏｆｑｕｅｎｃｈｅｄｒａｎｄｏｍｐｉｎｎｉｎｇｓｏｎｔｈｅｖｏｒｔｅｘｌａｔｔｉｃｅｉｓａｓｕｂｊｅｃｔｏｆｌｏｎｇｓｔａｎｄｉｎｇｉｎｔｅｒｅｓｔ.Ｉｎａｐｐｌｉｃａ ｔｉｏｎｏｆｈｉｇｈ Ｔｃｓｕｐｅｒｃｏｎｄｕｃｔｏｒｓｉｎｓｔｒｏｎｇｍａｇ ｎｅ… 相似文献
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The authors used Landau-Pekar variational method to investigate a strong-coupling singlet optical bipolaron in different configuration of quantum confinement.Numerical and analytical results showed that when configuration changes from quantum dot and wire to well,confinement shows different effect on the formation of a bipolaron.In contrast to a bipolaron in a quantum dot or wire,the binding energy of a bipolaron in a quantum well increases with increasing confinement,indicating that confinement favors bipolaron formation in a quantum well. 相似文献
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INTRODUCTION The bipolaron in bulk materials has been ex-tensively discussed in the past decade. With morerecent advances in the creation of nanocrystal withstrong ionic coupling (Hudgins et al., 1997), onenatural problem is that the effect of bipolarons insome quantum low dimensional systems with ef-fective electron-phonon coupling is very strongowing to the confinement. This problem is alsorelevant to the proposal of the bipolaronic mecha-nism for pairing in CuO2 plane (quasi-tw… 相似文献
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文章根据金剑铜业公司奥斯迈特熔炼系统主工艺及相关专业的要求,针对不同的给水水质特点,设计了生活生产消防给水系统、纯水及软化水给水系统,奥斯麦特熔炼炉水套及电炉水套等7套循环冷却水系统,确保了投产后主工艺系统及相关设备的正常运行。 相似文献
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