利用盐湖提锂尾液制备电池正极材料行业级碱式碳酸镁工艺研究

在青海锂业有限公司现有电池级碳酸锂生产线基础上,以ED分离尾液和碳沉锂转化尾液为原料,通过正交法试验开发镁、锂综合回收利用工艺路线,生产高附加值的电池正极材料行业级碱式碳酸镁,通过研究确定了最佳操作条件:物料反应配比1∶8~1∶12,反应温度45℃~60℃,反应时间45 min。在此条件制备的碱式碳酸镁满足HG/T 2959-2010的要求。该工艺方法可实现盐湖镁锂资源的综合利用。

参与式综合干预在高校预防艾滋病健康教育中的应用效果分析

目的 探讨参与式综合干预在高校预防艾滋病健康教育中的应用效果。方法 选择某高校在读的1000名大学生(2018年1月~2018年7月),随机分两组,500例/组,对照组实施常规艾滋病预防健康教育,观察组在常规艾滋病预防健康教育中实施参与式综合干预,比较艾滋病相关知识知晓情况、艾滋病正确态度持有情况、自我管理行为评分。结果 干预后,观察组学生的艾滋病各项知识知晓率、艾滋病正确态度持有率、自我管理行为各项评分均较干预前增高(P<0.05),其应对方式评分均较干预前改善(P<0.05),且观察组干预后的艾滋病各项知识知晓率、艾滋病正确态度持有率、自我管理行为评分均优于对照组(P<0.05)。结论 参与式综合干预用于高校学生艾滋病预防健康教育工作中,可有效促使高校学生更好地掌握艾滋病相关知识,使其正确对待艾滋病,有利于艾滋病预防工作在高校的开展。

Mapping QTLs Affecting Economic Traits on BTA3 in Chinese Holstein with Microsatellite Markers

It had been demonstrated that the strong and highly significant quantitative trait locus（QTL） can affect protein percentage on Bos Taurus Autosome 3（BTA3） at the position 52 cM, near the microsatellite DIK4353, with the 95% confidence interval spanning from 25 to 57 cM in Chinese Holstein population using QTL-express, MQREML, and GRIDQTL softwares. This study herein focused on such region of fine mapping QTLs for milk production and functional traits with 16 microsatellite markers with coverage of 33 cM between the markers BMS2904 and MB099 on BTA3 in a daughter-designed Chinese Holstein population. A total of 1 298 Holstein cows and 7 sires were genotyped for 16 microsatellites with ABI 3700 DNA sequencer. The variance components QTL linkage analysis（LA） and linkage-disequilibrium（LD） analysis（LA/LD） was performed to map QTLs for 7 traits, i.e., 305-d milk yield, fat yield, protein yield, fat percentage, protein percentage, somatic cell score and persistency of milk yield. Four strong and highly significant QTLs were detected for fat yield, fat percentage, protein percentage and somatic cell score at the position 40, 30, 27 and 26 cM, respectively. Two minor QTLs for milk yield and persistency of milk yield were identified at 42 and 46 cM, respectively. These findings provided a general idea for the fine mapping of the causal mutation for milk production and functional traits on BTA3 in the future.

武宣县早稻肥料利用率试验初报

【目的】探索当地洪积潴育沙土田水稻施肥规律及验证肥料利用率参数,更新县域测土配方施肥专家系统数据库,为洪积潴育沙土田进行配方施肥提供技术参考。【方法】开展早稻肥料利用率田间试验,研究在测土配方施肥技术基础上的肥料利用率。【结果】本试验条件下,氮肥利用率为31.05%,磷肥利用率为14.46%,钾肥利用率为32.63%;地力产量为297kg/667m^2,产量相对较高,地力水平较高;土壤供肥量每667m^2为N 6.69kg、P2O5 3.27kg、K2O 8.92kg,土壤氮为低水平、磷为中等偏高水平、钾为中水平。【结论】洪积潴育沙土田每667m^2水稻产量为450kg时,建议每667m^2配方施肥量为N 10kg、P2O5 3.5kg、K2O 8kg较合适。