This paper deals with the initial boundary value problems for the semilinear wave equations with variable coefficient principal part. By virtue of compactness uniqueness argument as well as the usual energy estimates...This paper deals with the initial boundary value problems for the semilinear wave equations with variable coefficient principal part. By virtue of compactness uniqueness argument as well as the usual energy estimates, we obtain some sufficient conditions which ensure the energy admits exponent decay.展开更多
This paper deals with the initial boundary value problems for the nonlinear wave equations with varable coefficient principal part.By virtue of compactness uniqueness argument as well as the usual ener-gy estimates,we...This paper deals with the initial boundary value problems for the nonlinear wave equations with varable coefficient principal part.By virtue of compactness uniqueness argument as well as the usual ener-gy estimates,we obthain some sufficient conditions which ensure the energy admits exponent decay.展开更多
一、以 after 和 before 引导的状语从句的主语若与主句主语一致时,可用 after 和 before 与从句谓语动词的动名词(短语)形式构成介词短语作状语。例: After she sang(可简化为:After singing),she left the rich man’s house. 唱完之...一、以 after 和 before 引导的状语从句的主语若与主句主语一致时,可用 after 和 before 与从句谓语动词的动名词(短语)形式构成介词短语作状语。例: After she sang(可简化为:After singing),she left the rich man’s house. 唱完之后,她就走出了那位阔佬的家。 Before we do the job(可简化为:Before doing the job),we’d better展开更多
【简析】“介词+关系代词”结构中,介词的选择常常令同学们头疼。从以上练习我们可以看出,要正确选用介词,必须弄明白以下内容:一、“介词+关系代词”结构中,关系代词只能用 which(指物)或 whom(指人),不能用 that 或 them 等词,而且介...【简析】“介词+关系代词”结构中,介词的选择常常令同学们头疼。从以上练习我们可以看出,要正确选用介词,必须弄明白以下内容:一、“介词+关系代词”结构中,关系代词只能用 which(指物)或 whom(指人),不能用 that 或 them 等词,而且介词和关系代词不能省。二、介词本身就是定语从句中短语动词固定搭配的一部分,这时介词既可放在关系代词前。展开更多
文摘This paper deals with the initial boundary value problems for the semilinear wave equations with variable coefficient principal part. By virtue of compactness uniqueness argument as well as the usual energy estimates, we obtain some sufficient conditions which ensure the energy admits exponent decay.
文摘This paper deals with the initial boundary value problems for the nonlinear wave equations with varable coefficient principal part.By virtue of compactness uniqueness argument as well as the usual ener-gy estimates,we obthain some sufficient conditions which ensure the energy admits exponent decay.
文摘一、以 after 和 before 引导的状语从句的主语若与主句主语一致时,可用 after 和 before 与从句谓语动词的动名词(短语)形式构成介词短语作状语。例: After she sang(可简化为:After singing),she left the rich man’s house. 唱完之后,她就走出了那位阔佬的家。 Before we do the job(可简化为:Before doing the job),we’d better
文摘【简析】“介词+关系代词”结构中,介词的选择常常令同学们头疼。从以上练习我们可以看出,要正确选用介词,必须弄明白以下内容:一、“介词+关系代词”结构中,关系代词只能用 which(指物)或 whom(指人),不能用 that 或 them 等词,而且介词和关系代词不能省。二、介词本身就是定语从句中短语动词固定搭配的一部分,这时介词既可放在关系代词前。
