普通麻花钻寿命评定指标的综合评价

通过钻削铸铁试验,对钻头磨损过程特性进行了分析.首次从可靠性、灵敏性、稳定性、测量难易性和磨钝标准确定的方便性等几个方面对钻头寿命评定指标VB_c,VB_(c1),VB_(c2),VB_B,VB_R和ω_φ进行了综合评价.得出了指标VB_R和VB_c是钻削铸铁的较优的钻头寿命评定指标的结论,并指出了通过试验评价钻头的切削性能或钻头寿命时必须优化试验的切削条件和合理确定试验的磨钝标准.     

协会开拓者--李瑞山

中国饲料工业协会从1985年成立至今,已经20年了!20年来,协会坚持为政府服务,为企业服务的方针,团结一致,努力工作,为中国饲料工业的发展,做出了卓越的贡献。同时,协会自身也在服务的过程中发展壮大起来,成为重要的行业管理组织,成为政府和企业之间的可靠桥梁。隆重庆祝中国饲料工业协会成立20周年,是我们饲料行业的一件大事,一件喜事。为此,中国饲料工业信息网、《中国饲料》、《饲料广角》杂志开辟《纪念中国饲料工业协会成立20周年》专栏,邀请有关领导、专家、企业家、科技工作者、饲料行业的老同志以及国际友人,为本栏撰写文章,或回顾饲料工业和饲料协会的发展历程,或展望美好的发展前景,或缅怀建立了卓越功绩的开拓者。这一期,发表了缅怀老会长李瑞山的文章和北京市饲料工业协会的纪念文章。     

更新观念创新服务

饲料工业在我国是一个新兴的产业,是涉及农业、化工、轻工、机械、医药、商业、电子等多学科、多部门综合性的产业,依附于种植业,服务于养殖业的农用工业,在国民经济中,是一个腾飞的朝阳工业。北京饲料工业是从20世纪70年代开始崛起,特别是改革开放以来,在市委、市政府的高度重     

如何实现母猪年产断奶仔猪30头的目标

当前全世界都面临着利用有限的土地面积,养活众多人口的问题,因此,需要高效的食品生产。如果母猪能提供更多的断奶仔猪数,饲养的母猪将会大量减少。丹麦最好的25%的农场的窝产活仔数和窝断奶仔猪数都高于全国平均水     

Intratree Variability of Tensile Strength Parallel to Grain in Chinese Fir and I-214 Poplar from Plantation

The variation of tensile strength parallel to grain in Chinese fir and I-214 poplar wood from plantations was studied in this paper. Aaccording to the national standards The Testing Methods for Physical and Mechanical Properties of Wood (GB 1927 to 1943 ? 1991), the small clear wood samples were cut and tested, which represent the south and north of trees with heights of 1.3, 3.3, 5.3 and 7.3 m. The results showed: the tensile strength parallel to grain of the north wood was higher than that of south wood. ANOVA shows that the tensile strength parallel to the grain with height is of significant difference (at 0.05 level).     

Preparation and Characterization of Phenolated Wood Using Sulfuric Acid as a Catalyst I: Liquefaction Behavior of Plantation Wood

Chinese fir (Cunninghamia lanceolata) and poplar (Populus spp.) wood meal were phenolated in the presence of sulfuric acid used as a catalyst. The effects of reaction time and reaction temperature on the wood liquefaction were investigated. The results showed that the reaction temperature had the greater influence on the residue content than reaction time. Additionally, the liquefaction curve for the Chinese fir and Poplar were similar in general.     

Pilot Study to Examine Radial Variation in Annual Ring Width, Density and Shrinkage

The annual ring width, density and shrinkage variation from pith to bark in Chinese fir (Cunninghamia lanceolata) and Boka sugi (Cryptomeria japonicd) were studied and compared. The results show that the ring width decreased sharply from pith to bark for Chinese fir. However, the ring width variation pattern for Boka sugi followed a different way, i.e., the ring width decreased to the fifth ring, increased to the tenth ring, decreased again to the fifteenth, and then increased to the twentieth, where it became constant. The large variations of Boka sugi appeared to show the maintenance of fast growth for many years. The annual ring mean density of Chinese fir increased gradually from pith to bark. However, the density changes for Boka sugi indicated the opposite trend, i.e., the mean density decreased gradually from pith to bark. The former showed a pattern as the same as a pine and a larch, and the latter was often found in a cedar and a cypress. The longitudinal shrinkage in juvenile wood was much hig     

劳卡（ROCO）：与德国舒乐咨询公司携手,对生产组织进行优化

在中国南部的广东省,正在兴起一种家具制造的新模式：通过签订协议,按照顾客的个性化需求对家具进行量身定制。2011年中期,劳卡公司投资建立了一家新工厂,该厂生产面积约1万m^2。通过实践,根据舒乐咨询公司建议的组织结构,在同等工作量投入的情况下,中国工人的人均产量却增长了近4倍。与之前封边机封边数量为每天1 800次相比,现在封边机每天可以完成3 400次的封边。     

丹麦猪肉食品安全体系

丹麦共有5000个猪场,年出栏生猪2800万头。其中780万头以活猪的形式卖到其它国家,其余在丹麦境内进行屠宰,其中170万头由个体屠宰场屠宰,1800万头由合作社