共查询到20条相似文献，搜索用时 46 毫秒
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讨论了各向异性窄四边形元的能量模和零模估计,并利用此单元求解线性抛物型方程,得到了半离散格式和全离散格式的误差估计。 相似文献
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王进贺 《新疆教育学院学报》1995,(4)
本文绘出了一类抛物型方程解的能量模估计，并进一步讨论了解的唯一性和稳定性，推进了某些文献的重要结果。关键词：抛物型方程能量模定解问题唯一性稳定性在讨论波动方程解的唯一性与稳定性时，能量模估计的方法是非常有效的工具，它同样适用于抛物型方程，文献[1]，[2]将这个方法引入到一维热传导方程解的性态的讨论中，本文对一类较一般的抛物型方程给出解的能量模估计，并讨论解的唯一性与稳定性。考虑如下抛物型方程的定解问题其中n是R”空间具有光滑边界的有界域，闭表示n的边界，壬（X，t），叩（X）为适当光滑的函数定理一：（能… 相似文献
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在各向异性网格剖分下,讨论了Sobolev-Galoern型非线性湿气迁移方程的四边形有限元逼近,得到了和传统有限元方法相同的能量模及L2模的误差估计结果. 相似文献
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讨论了各向异性线性三角形元的能量模和零模估计.并利用此单元求解抛物问题,得到了半离散格式和全离散格式的误差估计. 相似文献
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《南阳师范学院学报》2020,(4):21-28
研究了抛物型奇异积分算子与OSC函数生成交换子的端点估计,得到了抛物型奇异积分算子与OSC函数生成的交换子的端点估计的结果,并推广了Pérez的结果. 相似文献
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对一类抛物型积分一微分方程提出了一种全离散交替方向有限元格式，分析了该格式的收敛性，得到了最佳H^1模误差估计。 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献