巧播谷种丰收来——记谷子化控间苗技术

今天都市大众的食谱上,小米粥是常见的一项.小米即谷子,含有多种氨基酸和维生素,具有较高的营养价值.在我国北方山西、河北、陕西、甘肃等旱田作物地区,都保留了较大的谷子种植面积.在中国农作物史上,谷子更是重要的"五谷"之一.     

发动机装配线平衡问题的分析与改进

利用系统分析技术对洛阳北方易初摩托车有限公司发动机装配线的平衡问题进行了分析，分析认为调试工位是装配线的瓶颈工位，在瓶颈工位的调整中，用Delphi编制程序对装配线和调试线的节拍吻合进行了仿真，找出了二者最佳配合状态，并依此对发动机装配线进行了调整。对调整前后的综合分析表明：调整后的方案提高发动机的生产效率，降低成本，提升企业市场竞争力，从而提高企业经济效益。     

北方造山带内蒙古中、东部地区二叠纪放射虫的发现及意义

华北北部边缘区的二叠纪地层过去多认为是海相浅水沉积. 从内蒙古中部哲斯地区和东部锡林浩特地区二叠纪哲斯组泥岩中发现的放射虫化石等证据表明, 该区中二叠统主体应为深水海相沉积. 北方造山带内蒙古中、东部地区中二叠世深水海相地层的确定, 进一步证实华北板块与西伯利亚板块的最终拼合至少发生在瓜德鲁普世末之后, 同时根据含放射虫地层的分布和相关生物群的古地理分区推断拼合的位置应位于贺根山蛇绿岩带以南的林西地区.     

北方高寒地区青虾引进养殖的试验

逊克县地处黑龙江边小兴安岭北麓北纬48°01＇──49°36＇，年平均气温为摄氏－0．5度，属北方高寒地区，水产养殖品种单一。为改变这种局面，我们于1995年6月从杜蒙连环湖引进了高虾（日本沼虾），经过两年的养殖和越冬试验获得成功。现将试验养殖过程总结如下：一、亲虾的选取和运输设放我0拉湖区刚出水的虾中选取体形好，体色正常，肥满健壮无病无伤，性成熟状况良好的虾作为亲虾（旱：台为3：1），雌虾要求体长为6厘米以上，暂养在活水网箱中，运输采用双层塑料袋充氧运输，每只塑料袋中装水erffi升，装亲虾0．5斤左右，装好后将袋内空…     

中国北方的土地沙漠化问题

沙漠化不仅发生在干旱及半干旱地区,也发生在部分半湿润地区。世界上100多个国家和地区、全球35％的陆地面积、20％的人口受到沙漠化的威胁,沙漠化土地面积已达4 560万km~2。我国也是受沙漠化危害严重的国家之一,沙漠化土地在北方断续分布长达5 500km,涉及到辽宁、吉林、黑龙江、河北、山西、内蒙古、陕西、宁夏、甘肃、青海和新疆等省(区)共212个旗县,直接威胁到3 500万人民的生活环境。目前,我国沙漠化土地面积还在扩大,沙漠化已引起了经济、环境及社会一系列问题,造成了极大的经济损失。     

中国北方石炭系高岭石夹矸成分和性质

研究了中国北方石炭系高岭石夹矸的矿物组成和化学成分：主要矿物是高岭石，占９０％以上，化学成分近似于高岭石的理论成分；分析了该层夹矸在不同温度煅烧后的矿物化特征；得出了北方石炭系高岭石夹矸是优质高岭石矿产资源，是生产铝盐和Ａ型分子筛的优质无机化工原料的结论。     

我国北方草原蝗灾气象监测预警技术探讨

本文对草原蝗灾监测预警技术方法进行了系统归纳,并简述3S在草原蝗灾监测预警中的应用,同时,重点介绍了北方草原蝗灾气象等级(气象适宜度)预报关键技术,对蝗灾监测预警、提高防灾减灾经济效益具有重要的实际意义。     

Precipitation of rutile needles in garnet from sillimanite-bearing pelitic granulite from the Khondalite Belt,North China Craton

Pelitic granulite from the Khondalite Belt, North China Craton, is composed of garnet, sillimanite, perthite, biotite and quartz. Oriented rutile needles in gar- net are reported for the first time from the granulite. The rutile needles have been identified by optical microscopy and confirmed by in situ Raman spectroscopy, where they show the characteristic bands at 446-448 and 610 cm-1. Because of their very strong shape preferred orientation in 3-4 easily observable directions, these futile needles are interpreted to have formed by precipitation during exhu- mation and cooling following peak metamorphism. The ternary feldspar geothermometer gives a peak metamorphic temperature of ,- 980 ℃ at 10 kbar. The presence of oriented rutile needles in garnet is suggested to be a valuable indicator of ultrahigh-temperature （UHT） metamorphism in the Khondalite Belt and therefore likely in other UHT terrains.     

Body weights in Han Chinese populations

The body weights of 26,954 Han Chinese adults in 67 areas （16,503 in rural areas and 10,451 in urban areas） across China were measured from 2009 to 2013. The results showed that in China, the three areas （north China, northeast China, and Jianghuai Plain） were with the greatest body weight. Northwest Hart Chinese populations were heavier. Southwestern dialect groups were at the middle level and lighter than northern Han Chinese populations, but were heavier among southern Han Chinese populations. Chinese Han who located in areas of Hangjiahu were the general level, and similar to south- western dialect groups. The mean values of body weight in Hunan Han and Fujian Han were greater than other Han groups in southern China. Gan dialect groups and Can- tonese dialect groups showed the minimum body weight value in all Chinese Han groups. Besides, the mean body weight of Hakka was heavier than Gan dialect groups and Cantonese dialect groups which were adjacent to Hakka. Body weight increases with an increase in height, bone diameter, subcutaneous fat on the limbs and trunk, chest circumference, and abdomen circumference. This study revealed that northern Han men were heavier than southern Hart men, because the former were taller and had a larger waist circumference as well as thicker subcutaneous fat on their backs. Among women, height, bone diameter of the upper limbs, chest and abdomen circumferences, and sub- cutaneous fat on the limbs and trunks of northern Hart exceeded those of rural southern Han. Consequently, body weight values of northern Han women were higher than those of southern Han women. While a significant differ- ence in these values was found between urban and rural men, no significant difference occurred between urban and rural women. Body weight was associated with age in urban and rural men only in the case of minority groups. However, there was a positive correlation between body weight and age in the majority groups of both urban and rural women. The particular composition of genes involv