轴孔测量中的一种数字滤波器的设计

对现有轴孔测量仪进行改造,采用数字信号处理技术设计FIR数字滤波器,对测量信号实行软件滤波,替代原有的硬件滤波电路。测试结果表明,该数字滤波器可以满足轴孔测量的要求。     

黑龙江省规模化生态养猪场典型示范技术总结

为深入落实<黑龙江省五千万头生猪规模化养殖战略工程规划>,促进黑龙江省生态养猪法的推广应用,提高生猪规模化、标准化养殖水平,解决畜禽排泄物污染环境问题,增加农民收入,加快新农村建设步伐,黑龙江省畜牧兽医局于2009年5月份将黑龙江省畜牧研究所定为生态养猪典型示范单位,主要负责商品育肥猪的饲养试验,共进行2个阶段的试验...     

有机食品生产问题探讨

1有机食品生产与传统农业生产的区别有机食品生产既不同于现代农业生产,也不同于传统农业生产,其生产需要符合以下5个条件:1原料必须来自于建立的或正在建立的有机农业生产体系,或采用有机方式采集的野生天然产品;2在整个生产过程中必须严格遵循有机食品加工、包装、贮藏、运输标准;3在生产和流通过程中,必须有完善的质量控制和跟踪审查体系,并有完整的生产和销售记录档案;4要求在整个生产过程中对环境造成的污染和生态破坏影响最小;5必须通过独立的有机食品认证机构的认证。这样就排除因高能量投入,大量使用化学物质带来的弊病,吸收传统农…     

柳州市粮食综合生产能力评价研究

分析研究柳州市粮食综合生产能力情况,重点对柳州市中长期粮食生产各相关因素进行分析评价,预测柳州市中长期可达到的粮食生产水平,并提出相应的建议。     

致作者

?A g r i c u l t u r a l B i o t e c h n o l o g y?(中文译名《农业生物技术》)是由美国国会图书馆主管,美国Wu Chu(USA-China)Science and Culture Media Corporation?中文译名:吴楚(美中)科技文化传媒公司】主办的全英文期刊,ISSN刊号:2164-4993,暂为双月刊,刊物内容包括与农业科学相关的植物、动物、微生物及林业、海洋等学科在组织、器官、细胞、染色体、蛋白质、基因、酶、发酵工程等不同水平上的农业     

高粱杂交种辽杂7号选育报告

高粱杂交种辽杂７号选育报告刘河山张欣石玉学卢庆善宋仁本潘中平（辽宁省农科院高粱所沈阳１１０１６１）１选育经过辽杂７号是辽宁省农科院高粱所于１９８９年用外引不育系４２１Ａ（引自ＩＣＲＩＳＡＴ，原编号ＳＰＬ１３２Ａ）与自选恢复系ＬＲ９１９８（矮四／５－２...     

食品科学与工程专业毕业论文(设计)质量提升探究与实践

本科毕业设计(论文)是大学培养人才的一个重要环节,是学生对大学四年所学知识的综合运用。长江大学为提高食品科学与工程专业毕业设计(论文)质量,多年来探究一套行之有效的质量提升办法,实践表明,毕业设计(论文)的总体质量呈逐年提升态势。     

Phosphorus accumulation and leaching risk of greenhouse vegetable soils in Southeast China

Over-fertilization has caused significant phosphorus(P) accumulation in Chinese greenhouse vegetable production(GVP) soils. This study, for the first time, quantified profile P accumulation directly from soil P measurements, as well as subsoil P immobilization, in three alkaline coarse-textured GVP soil profiles with 5(S5), 15(S15), and 30(S30) years of cultivation in Tongshan, Southeast China. For each profile, soil samples were collected at depths of 0–10(topsoil), 10–20, 20–40, 40–60, 60–80, and 80–100 cm. Phosphorus accumulation was estimated from the difference in P contents between topsoil and parent material(60–100 cm subsoil). Phosphorus mobility was assessed from measurements of water-soluble P concentration(PSol). Finally, P sorption isotherms were produced using a batch sorption experiment and fitted using a modified Langmuir model. High total P contents of 1 980(S5), 3 190(S15), and 2 330(S30) mg kg~(-1) were measured in the topsoils versus lower total P content of approximately 600 mg kg~(-1) in the 80–100 cm subsoils. Likewise, topsoil PSol values were very high, varying from 6.4 to 17.0 mg L~(-1). The estimated annual P accumulations in the topsoils were 397(S5), 212(S15), and 78(S30) kg ha~(-1) year~(-1). Sorption isotherms demonstrated the dominance of P desorption in highly P-saturated topsoils, whereas the amount of adsorbed P increased in the 80–100 cm subsoils with slightly larger P adsorption capacity. The total P adsorption capacity of the 80–100 cm subsoils at a solution P concentration of0.5 mg L~(-1) was 15.7(S5), 8.7(S15), and 6.5(S30) kg ha~(-1), demonstrating that subsoils were unable to secure P concentrations in leaching water below 0.5 mg L~(-1) because of their insufficient P-binding capacity.     

Rising utilization of stable isotopes in tree rings for climate change and forest ecology

Analyses of stable isotopes(C, O, H) in tree rings are increasingly important cross-disciplinary programs. The rapid development in this field documented in an increasing number of publications requires a comprehensive review. This study includes a bibliometric analysis-based review to better understand research trends in tree ring stable isotope research. Overall, 1475 publications were selected from the Web of Science Core Collection for 1974–2023.The findings are that:(1) numbers of annual pu...     

酶制剂在食品领域中的应用

酶制剂是一种生态型高效催化剂,具有高效、安全、生态和环保等特点,能够有效带动相关领域技术水平的提高,在食品产业开发新产品、提高质量、节能降耗、保护环境等方面具有广阔的应用价值,并将产生巨大的社会效益和经济效益。