排序方式： 共有8条查询结果，搜索用时 22 毫秒
1
1.
2.
Motoi Yasumura Takahisa Kamada Yutaka Imura Motoi Uesugi Laurent Daudeville 《Journal of Wood Science》2006,52(1):69-74
Pseudodynamic (PSD) tests were conducted on two-level timber structures with plywood-sheathed shear walls, which each had
an opening of different configuration, to study the effects of the mechanical properties of the first and second levels on
the earthquake response of the structure. The specimens had two-level conventional post and beam frames that were 3 m wide,
3 m deep, and 6 m high with plywood sheathings nailed on one face of the structure. The first and second levels had different
opening configurations of window, door, or slit. Lateral forces were applied at the top of the first and second levels, calculating
step by step the next displacement based on the North-South (NS) components of the 1940 El Centro earthquake. The test results
were compared with those of the time-history earthquake response analysis using the lumped mass model and hysteresis model
presented in the companion article (part I). The experimental and simulated results showed that the simulation by means of
the lumped mass time-history earthquake response analysis predicted quite well the response of the first level, but tended
to underestimate the response of the second level, and that the PSD tests of an individual wall system with the mass supported
by that particular wall generally show a conservative estimate of the response. 相似文献
3.
通过比较分析夏、秋季茭白鞘叶(sheathing leaf of Zizania latifolia,SLZL)、叶片等成分差异,并利用5%尿素和3%氢氧化钠(sodium hydroxide,NaOH)溶液处理,观察、分析其对SLZL感官和成分的影响,以期为SLZL饲料化利用提供依据。结果显示:秋茭鞘叶的总能和粗蛋白含量分别比夏茭高1.85%～2.28%和6.42%～10.14%,而粗纤维、中洗纤维、酸洗纤维、半纤维、木质素和粗灰分的含量低于夏茭,夏、秋茭叶片的总能和粗蛋白含量分别比叶鞘高8.59%和71.47%;尿素溶液处理后SLZL呈鲜绿色,NaOH处理后呈浅黄色,且质地明显变软、变薄;NaOH处理后干物质和粗蛋白的溶出率分别为48.42%和13.52%,是尿素组的2.8倍和5.4倍,中洗纤维和半纤维的溶出率达到27.27%和24.15%。由此,秋茭鞘叶的饲用价值要优于夏茭,叶片优于叶鞘和鞘叶,尿素和NaOH处理有利于提高草食动物对SLZL的适口性和养分消化,结合生产实际,尿素处理SLZL是可选择的方法。 相似文献
4.
介绍一种新的高效生态循环利用栽培模式,即茭白田套养泥鳅结合茭白鞘叶露天栽培大球盖菇,不仅能有效提高农田的复种指数,大幅提高经济效益,而且可以充分利用资源,保护生态环境,具有很好的生态效益。 相似文献
5.
6.
7.
利用茭白鞘叶栽培双孢蘑菇进行研究结果表明,茭白鞘叶中含有较高的营养成分,且明显高于稻草。茭白鞘叶堆制发酵温度较稻草前期偏低,但全期平均温度两者持平。茭白鞘叶配方的蘑菇现蕾期和开始采菇时间分别比稻草配方迟3 d和4 d;茭白鞘叶配方采菇时间达156 d,较稻草配方延长12 d,且可采收5批,比稻草配方多1个批次;茭白鞘叶配方蘑菇产量和稻草配方接近,分别是6.65 kg/m2和6.29 kg/m2。表明茭白鞘叶是栽培蘑菇的理想材料。经济效益分析表明,利用茭白鞘叶栽培双孢蘑菇每667m2的净收入可达11 886元。利用茭白鞘叶作为栽培蘑菇是解决茭白鞘叶资源浪费和环境污染的可行途径。 相似文献
8.
国产轻型木结构用落叶松胶合板覆板生产技术与性能评价 总被引：1，自引：0，他引：1
介绍了我国常规工艺生产的落叶松结构胶合板产品的各项物理、力学和结构性能,研究开发了轻型木结构用落叶松胶合板覆板的生产技术.通过采用厚单板组坯工艺,在工业化条件下生产了落叶松墙面板产品,并对其外观质量、规格尺寸、物理力学及结构性能进行了全面检验和分析比较.结果表明,国产落叶松结构胶合板墙面板的各项性能均达到和超过北美及相关标准要求,可以用作轻型木结构房屋覆板. 相似文献
1