共查询到19条相似文献,搜索用时 78 毫秒
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《大众标准化》2005,(3)
本次山西省质量技术监督局共对186个生产、经销企业生产、销售的240种产品进行了抽查。合格136种,抽查合格率为56.7 %。在抽查的8类产品中,化肥抽查合格率为67 %;农药抽查合格率为47 %,种子抽查合格率为63.3 %;果蔬饮料抽查合格率为40 %;白酒抽查合格率为70 %;电动玩具抽查合格率为27.5 %;电磁灶抽查合格率为80 %;冶金焦化抽查合格率为76.7 %。本次山西省质量技术监督局共对186个生产、经销企业生产、销售的240种产品进行了抽查。合格136种,抽查合格率为56.7 %。在抽查的8类产品中,化肥抽查合格率为67 %;农药抽查合格率为47 %,种子抽查合格率为63.3 %;果蔬饮料抽查合格率为40 %;白酒抽查合格率为70 %;电动玩具抽查合格率为27.5 %;电磁灶抽查合格率为80 %;冶金焦化抽查合格率为76.7 %。 相似文献
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文章探讨了用原子荧光光度计同时检测聚合氯化铝中的砷和汞含量的分析方法。试验结果为:砷在0~10.0ug/L范围内,线性相关系数为r=0.9995,检出限为0.0654 ug/L,相对标准偏差为1.12%,回收率为90.85%~99.4%;汞在0~1.00ug/L范围内,线性相关系数为r=0.9995,检出限为0.03328 ug/L,相对标准偏差为3.78%,回收率为99.5%~117%。实验结果表明,该方法灵敏度高,精密度好,具有一次性消化样品同时测定两种元素的特点。 相似文献
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全球复苏加快 政策调整谨慎 总被引:1,自引:0,他引:1
(一)美国经济恢复经济回暖。在2011年四个季度中,美国经济增长率分别为2.3%、1.3%、1.8%和3%。也就是说,从2011年第二季度起,美国经济逐季回升。根据美联储6月份的最新预测,2012年美国经济增长率为1.9%-2.4%;失业率为8%-8.2%;通胀率为1.2%-1.7%。尽管在这一组预测,一些数据略差于美联储4月份的 相似文献
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今年7月底,美国商务部发布的第二季度经济增长速度为1.9%,同时将去年四季度和今年一季度的经济增长速度分别从0.6%和1%调低至-0.2%和0.9%:8月底又把今年第二季度的经济增长速度调高为3.3%. 相似文献
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We deploy the unique opportunity of a dataset of Flemish school leavers to measure the incidence of over- and undereducation
on the basis of the six applied measures in the literature. The incidence of overeducation in the first job after leaving
school ranges from only 8% to 51%, undereducation ranges from 3% to 21%. While 66% is overeducated on the basis of at least
one measure, only 3% is overeducated on the basis of every measure. Mismatch correlations range from 5% to 82%. Also the categories
in terms of gender, educational level and region of residence with the highest likelihood of being overeducated depend on
the measure. These findings clearly underline the weakness of the literature on this subject. However, measuring overeducation
in different ways enables to derive some alternative concepts. Genuine overeducation amounts to about 20%. The incidence of
over- and undereducation is both attributed to qualification inflation and deflation, and a credential gap. Finally, about
80% of the incidence of overeducation is classified as being structural. 相似文献
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中国是否存在最优通货膨胀区间——通货膨胀和经济增长关系实证研究 总被引:2,自引:0,他引:2
利用门限回归模型(threshold regression model)分析中国通货膨胀与经济增长之间的关系,实证研究发现中国通货膨胀对经济增长的影响不是单一形态,而是具有非线性特征。中国经济存在最优通货膨胀区间1.4%~5.1%,而当通货膨胀高于5.1%或低于1.4%时,通货膨胀(通过影响生产要素)对经济增长有负的影响。 相似文献
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中国贸易依存度的实证分析 总被引:2,自引:0,他引:2
经济全球化的大背景下,特别是中国加入WTO后,中国经济融入世界经济的步伐加快,传统贸易依存度从1978年的9.8%,80年代中期的23%提高到1999年的36.4%,2000年进一步提高到43.9%,其中出口依存度达到23.1%。2003年达到60.4%,出口依存度提高到31.1%。随之而来,部分学者高呼:贸易依存度过高,中国经济安全日益受到危胁,应该降低贸易依存度,本文以分析传统贸易依存度的概念为出发点,结合经济学原理,从一国对国际贸易的依赖程度和对一国的经济贡献角度提出贸易依存度新的度量方法,得出中国外贸依存度是相当低的。 相似文献
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本文以废弃半焦粉为原料,添加合适的粘结剂,通过压制成型以及共炭化热解来制造工业型焦。通过实验讨论了共炭化温度和时间对成品的强度和孔隙率的影响,确定了整个共炭化工艺的最优条件:共炭化温度800℃,共炭化时间90 min。在此条件下,型焦的抗压强度可达7.55 MPa、I转鼓强度为41.03%,孔隙率为51.94%,型焦的水分、灰分、挥发份分别为0.78%、16.42%、4.02%。 相似文献
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建立了碱熔后盐酸酸化,ICP-AES法测定铝土矿和高岭土中CaO、MgO含量的方法。方法检出限为CaO 0.0022%。MgO0.0004%。对国家标准物质GBW03122进行连续12次测定,方法精密度分别为(RSD)CaO0.67%。MgO1.50%,结果与标准值相符。 相似文献
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《Socio》2020
We analyze technical progress in the Brazilian agriculture in the period 1976–2016. Output is production value and inputs are expenses on land, labor, and other inputs. Data Envelopment Analysis (DEA) measures are used to capture technological progress via efficiency analysis. Filtering the data with a moving average and fractional regression we identify four periods with distinct behavior of technical efficiency under constant or decreasing returns to scale. From 1976 to 1988 and from 1996 to 2007 technical efficiency decreases at statistically significant rates of −1.74% and −0.26% respectively. From 1989 to 1995 and from 2008 to 2016 efficiency increases at statistically significant rates of 1.53% and 1.75% respectively. Efficiency of input use varies in these periods and is computed as a byproduct of the DEA analysis. We observe a more efficient usage of land and other inputs. A parametric fit using adjusted efficient inputs indicate the relative elasticities of 40.5%, 38.5% and 21.0% for other inputs, land and labor, respectively. Technological progress increases 3.73% in the period 1976–1988, decreases 1,58% between 1989 and 1995, increases 0.17% in the period 1996–2007 and increases 1.01% between 2008 and 2016. Technological inputs are statistically significantly influential on total factor productivity as indicated by an infinite distributed lag model. The long run elasticity effect is 39.5%. The effect of investments (public) in agricultural research has a significant elasticity of 0.835. 相似文献
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文章对土易溶盐的传统分析方法进行了一些改进,建立了ICP-AES测定土易溶盐中CaO、MgO、SO4^2-的方法。方法线性范围CaO为0.1~40 mg/L;MgO为0.02~10 mg/L,SO4^2-为0.2~100 mg/L。方法检出限CaO为0.022 4 mg/L,MgO为0.003 8 mg/L,SO4^2-为0.0279 mg/L。精密度(RSD)CaO为0.99%,MgO为1.71%, SO4^2-为1.66%。回收率(R)为96.0%~103.2%。 相似文献