摘要:
科技发展日新月异,各种新奇产品如雨后春笋般进入人们的生活,让人应接不暇。最近,在实验室里,电池正经历着一次小小的革命。喷绘电池有没有想过有一天,电池将不再是现在熟悉的圆柱或板状,而是一层薄薄的涂层?美国休斯敦莱斯大学和比利时鲁汶天主教大学合作研发了一种可喷绘电池,可将电池喷涂到包括玻璃、弹性薄膜、瓷砖以及不锈钢等几乎任何材质的表面,并释放能量。研究人员将普通锂离子电池的成分混合在一起,制成涂料,根据传统电池结构顺序正确喷刷出涂层,这个涂层就能像正常电池那样储存和释放电能。从实验室发布的研究报告中得知,他们曾在9块浴室瓷砖上进行喷涂,并将它们拼接在一起形成一块完整电池;该电池可连接6个多小时,提 阅读全文
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如何让tableviewcell点击时变蓝,手移开时蓝色消失
2012-03-30 15:10 by java环境变量, 283 阅读, 收藏,
摘要:
在- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 方法中,[tableView deselectRowAtIndexPath:[tableView indexPathForSelectedRow] animated:YES] 阅读全文
poj 3349 Snowflake Snow Snowflakes -----hash (vector)
2012-03-15 14:58 by java环境变量, 283 阅读, 收藏,
摘要:
Snowflake Snow SnowflakesTime Limit:4000MSMemory Limit:65536KTotal Submissions:20853Accepted:5449DescriptionYou may have heard that no two snowflakes are alike. Your task is to write a program to determine whether this is really true. Your program will read information about a collection of snowflak 阅读全文
rman 恢复system
2012-06-04 13:41 by java环境变量, 282 阅读, 收藏,
摘要:
在mount状态下进入RMAN执行两条命令就可以了,命令如下:restore tablespace system; recover tablespace system; alter database open; 阅读全文
poj 2386 Lake Counting-----DFS
2012-05-16 20:28 by java环境变量, 282 阅读, 收藏,
摘要:
Lake CountingTime Limit:1000MSMemory Limit:65536KTotal Submissions:13556Accepted:6909DescriptionDue to recent rains, water has pooled in various places in Farmer John's field, which is represented by a rectangle of N x M (1 <= N <= 100; 1 <= M <= 100) squares. Each square contains ei 阅读全文
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