| 1 | Influence of harvest date on seed yield and quality in forage kochia显示文摘Forage kochia(Bassia prostrata) is used for rangeland reclamation and livestock and wildlife forage,but limited research has been conducted on its seed production. Therefore, this research evaluated the effect of harvest date on seed weight, germination, and seed yield of forage kochia subspecies virescens and grisea. Seed was harvested from individual plants for 3 years during October, November, and December. October harvest had the lightest 100-seed weights, with the November harvest slightly heavier than December, for most accessions.Cultivar Snowstorm and breeding line Sahsel, both subsp. grisea, had the greatest 100-seed weights in November, 155 and 143 mg, respectively, whereas, cv.Immigrant(subsp. virescens), the standard for forage kochia, ranked among the least for 100-seed weight. For most accessions, germination was lowest from the October harvest(11%–43%), with greater germination with November and December harvested seeds(43%–64%).Viable seed yields were greatest in November with the exception of two accessions, which peaked in October,indicating earlier maturity. Results indicate that forage kochia usually reaches optimum seed maturity by early November, after plants are exposed to freezing temperatures; however, earlier maturing accessions exist in both subspecies virescens and grisea. | Cody F.CREECH Blair L.WALDRON Corey V.RANSOM Dale R.ZOBELL Joseph Earl CREECH | 2018 | Frontiers of Agricultural Science and Engineering2018，5，1： | 0 |
| 2 | 数字与机械电位计:使系统性能最优化的设计考虑因素显示文摘电位计可用于通过改变设备电阻调整电压或电流.然后,当与其他元件(如运算放大器)配合使用时,此调整可用于设置不同的电平或增益.使用如数字电位计这样的可变元件,设计师可以设计出灵活且有多种功能的系统.例如,在运算放大器中,用数字电位计作为反馈电阻,可以使运算放大器的增益根据输入信号的幅度而改变.这样,设计师就可以减少元件数量(如多个运算放大器),最大程度地增加系统可以支持的输入信号类型,同时减小PCB尺寸.数字电位计可以以很小的尺寸提供很多的功能. | Joseph Creech David Rice | 2015 | 中国集成电路2015，24，6： | 0 |
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