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1.
通过把方程变形为向量形式,从而引进无穷小生成元和局部Lipschitz条件,结合Sobolev嵌入定理,利用经典的半群理论得到了方程{utt+△^2u+u+ut|ut|^m-1=u|u|^p-1,(t,x)∈[0,T]×Ω u(t,x)=0 (t,x)∈[0,T]×e↓Ω u(x,0)=φ(x),ut(x,0)=φ(x),的局部解的存在性。  相似文献   

2.
冯培娟  宋书芳 《消费导刊》2011,(11):173-173
这篇文章应用现代变分理论对一类四阶半线性微分方程μ^(4)-Aμ^n-Bu-Vn(t,u)=0(I) 2T-周期解的存在性进行研究,其中A>0,B<0,V(t,u)∈C^1([o,T]×R,R)  相似文献   

3.
的正解存在的情况.其中”≥2,且甜在[O,∞)→[o,∞)上是连续的.在本文中将给出边值问题(1.2.1)的正解存在性结果.并且本文的研究是在非线性项厂的增长不受限制的条件下进行的,不需要大量的假设.对边值问题(12.1)利用锥上不动点指数定理进行研究.最终给出边值问题(1.2.1)的正解存在性定理.  相似文献   

4.
宋梅歌 《商》2014,(35):284-284
目的:探讨大学生大五人格与跨期选择的关系。方法:采用大五人格问卷简易版(NEO-FFI)和跨期选择实验范式,对103名大学生进行问卷调查和任务研究。结果:①男生的外向性得分显著低于女生(t=2.344,P〈0.05);②外向性得分与折扣率呈显著正相关(r=0.255,P〈0.01)。结论:外向性得分越高的个体折扣率越大,在跨期选择中倾向于选择立即小奖赏。  相似文献   

5.
通过对湛江口岸10925名出入境人员健康体检肝胆B超检查,并对检查结果进行分析。共检出肝胆疾病905例,发病率为8.28%,主要为肝脏实质性占位病变、脂肪肝、肝内结石、肝下移、肝囊肿、胆石症、胆囊息肉、胆囊腺肌症等,其中以脂肪肝占比例最高(70.2%)。肝胆疾病患病率在小于30岁年龄组与〈30岁及以上年龄组之间有明显差异(u=17.41 P〈0.01);船员患病率也较其他人员高(u=6.99 p〈0.01)。提示对30岁以上的出入境人员尤其是船员健康体检实施肝胆B超检查的必要性。  相似文献   

6.
Do宜:St a rt wi t h t h e b a si c v a l ue p ro p o si t i o n of t h e sh o w.从展会最基本的优势着手。Sho w o rga n iz e rs usu al l y g et ve ry e x ci t ed ab o ut wh a t’s n e w wit ht he i r p ro g ra ms.Bu t t h at’s n ow th e t a ck yo u r messa  相似文献   

7.
Crisis influence on China's three driving forces
The financial crisis didn't influence the consumption (one of the three driving forces) much, but indeed influence the trade (negative effects), and the investment (stimulating effects).  相似文献   

8.
目的:探讨进展性脑梗塞伴吞咽困难患者早期护理干预的临床效果。方法 将60例进展性脑梗塞伴有吞咽困难的患者随机分为研究组(n=30)和对照组(n=30),两组患者均开展常规护理和对症治疗,而研究组在此基础上早期给予针对性评估、摄食训练、肌肉群训练。结果对照组吸入性肺炎发生率(n=8,26.67%)高于研究组(n=2,6.67%)(x2=3.000 P=0.035);研究组吞咽功能有效率(n=2893.33%)高于对照组(n=2066.67%)(x2=5.104P=0.008)。结论:对吞咽困难的进展性脑梗塞患者,开展早期护理干预能够改善患者的吞咽功能,降低食物逆流及误吸的危险,降低吸入性肺炎的发生。  相似文献   

9.
(接2004年12期158页) 最短路径为vs-v1-v3-vt,记为增广链u.图(b)为容量图,弧旁数字代表(fij,cij),在u0量θ1=4,得新的可行流,流量f1=4.图(c)为赋权有向图,最短路为vs-v2-v3-vt,记为增广链u1.  相似文献   

10.
China's grain output is expected to top 500 million tonaes for the third consecutive year in 2009, said an official from the Ministry of Agriculture (MOA) on December 2t. The country's planting area was expected to increase 34 million mu (2.27 million hectares) this year, the biggest rise since 2006, which was a major contributor to this year's grain production growth, said Ye Zhenqin, director with the Planting Industry Management Department of the MOA, at a press conference.  相似文献   

11.
March in Beijing doesn't only embrace the warm spring's coming, also the two parliamentary sessions of China, the national conference in the highest level of China's parliament and top political advisory body. This year's two sessions, namely, the 2nd Session of the 1 lth National People's Congress (NPC) and the 2nd Session of the 1 lth National Committee of the Chinese People's Political Consultative Conference (CPPCC) lasted from March 5 to 18, and March 3 to 14, respectively. It was the first NPC & CPPCC held since international financial crisis China strongly felt last September.  相似文献   

12.
汉语鲜词     
嘛去?
What are you up to? It's the expression short for 干嘛去 (gan ma qu), but 干(gan, means do) is often omitted in daily language, especially in northern part of China. It's used as greeting when two friends meet each other, but it's not necessary to answer it seriously. Because people who asked this question don't really want to know where are you going, just a way to say' Hi', or 'Good morning', 'Good afternoon'.  相似文献   

13.
1、读语句本语言只有无格式读语句,其形式为:READ(u) K{ READ(u) u为整常数或整变量,称为设备号,用来指示从什么设备上接收一批数据。当u=0或1时表示光电输入机。u=(I十1)x10o+J表示从第I台磁鼓,第J区开始.u=(I十1)x1000十J表示从第工台磁带机上,第J区开始。 K为输入表,指示数据输入后应放到何处。输入表的一般形式  相似文献   

14.
It ain't easy replacing the US dollar. Some see the Chinese yuan (CNY) as the imminent replacement of the US dollar (USD) as the world's dominant reserve currency. However, those involved in the CNY's first forays overseas as a means of invoicing and payment for cross-border trade have known from the start that this process will take some time. Nine months into the CNY trade settlement pilot scheme, this seems like a good time to report on the progress and examine the outstanding challenges.  相似文献   

15.
As Bangladesh celebrated its 37th anniversary of Independence and National Day on March 26, China's Foreign Trade interviewed H.E.Mr.Munshi Faiz Ahmad,Ambassador Extraordinary and Plenipotentiary of Bangladesh to the People's Republic of China."Bangladesh and China enjoy traditional friendship for a long time.For example,Xuan Zang (the Chinese Buddhist monk famous for his"Journey to the West"during the Tang dynasty) and Admiral Zheng He (the great Chinese navigator from the Ming dynasty) visited Bengal in their respective times.  相似文献   

16.
函数的零点是函数图象与x轴交点的横坐标,即方程f(x)=0的解。它是一个数而不是点的坐标。是新课标的新增内容,也是高考的热点。要求学生能够结合函数的图象,理解函数的零点与方程的根的联系,转化为判断方程根的存在性及根的个数。下面就函数零点试题常见类型进行解析。  相似文献   

17.
戈伯兹曲线是英国人寿保险专家戈伯兹(B.Gompertz)为预测人口增长于1820年提出的一条S型曲线。其解析式通常写作 Y_t=Ka~b~t,t=0,1,2,…0 (1) 这里,Yt表示t期社会拥有量,k表示饱和水平,a=a_0=Y_0/K,表示初始饱和率,b表示成长指数,t表示期序。这条戈伯兹曲线由美国学者普莱斯科特(R. Prescott)于1922年首次引入市场预测。普莱斯科特分析了戈伯兹曲线的形状变化特征,提出了工业产品发展四阶段的“成长法则”  相似文献   

18.
《化工科技市场》2009,32(10):48-48
2007年,中国硝酸产量达705.0万t,超过美国跃居世界第一位;2008年硝酸生产企业达80家以上,产量800万t。 新中国成立时,中国只有两家硝酸生产企业,即永利宁厂(现南京化学工业公司)和大连化学厂(现大连化学工业公司),年产量只有4200t。目前,中国硝酸生产企业已达80家以上,年产量800万t;装置核心技术已由过去的完全依赖进口,到现在全部实现了国产化。  相似文献   

19.
本文运用“零点法”由y=Asin(ωx+Ф)(ω〉0,A〉0)的图象确定初相“Ф”,方法简便易行,并运用例题给予示范说明。  相似文献   

20.
Alt h o u g h t h e C h i n e s eGovernment is encouragingforeign investment in Stateenterprises, foreign investors are alsorequired to observe related rules.According to a regulation on foreigninvestment announced in 1988 by theState Council, foreign invested projectscould be put into four categories: thosewhich were encouraged, approved,restricted or prohibited."All foreign penetration into domesticenterprises, by whatever means, shouldfirmly observe related laws andregulations," the regul…  相似文献   

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