曾经,以客观、严苛著称的美国《消费者报告》将特斯拉列为年度推荐车型,但在2015年,特斯拉Model S被移出了推荐名单,原因是"可靠性低于平均水平"满分100,特斯拉1032015年8月,在美国《消费者报告》公布的"十大最好开的车&...曾经,以客观、严苛著称的美国《消费者报告》将特斯拉列为年度推荐车型,但在2015年,特斯拉Model S被移出了推荐名单,原因是"可靠性低于平均水平"满分100,特斯拉1032015年8月,在美国《消费者报告》公布的"十大最好开的车"名单中,位列第一和第二名的,均来自硅谷,而且还是同一个品牌——特斯拉Model S P85D和Model S(85kWh),前者更是凭借超出总分100分的成绩,成为美国《消费者报告》路测史上分数最高的车型。《消费者报告》通过对车辆至少50次的赛道和公路测试评估,得出了上述结论,并给出了通俗易懂的理由:比如Model S P85D从静止加速至约96km/h仅需3.5s。展开更多
The purpose of this procedure was to optimize and improve a method that used for the determination of arsenic （Ⅲ） and arsenic （Ⅴ） in biological and environmental samples. The method is based on hydride generatio...The purpose of this procedure was to optimize and improve a method that used for the determination of arsenic （Ⅲ） and arsenic （Ⅴ） in biological and environmental samples. The method is based on hydride generation and atomic absorption spectrometry. For both As （Ⅲ） and As （Ⅴ） the parameters such as NaBH4, HCI concentration, and pH were optimized. Absorption signal of As （Ⅴ） was approximately 17% of As （Ⅲ） signal. Therefore, for estimation of As （Ⅲ） and As （Ⅴ） concentrations in various samples the difference between the absorbance obtained for arsenic, without and with previous treatment of samples with potassium iodide （KI）, can be applied. The calibration graphs were linear （r〉0.99）, and the detection limits of the method based on three times the standard deviation of the blank were 0.14 and 0.64 μL^-1 for As （Ⅲ） and As （Ⅴ）, respectively. The relative standard deviation （R.S.D.） of measurements was less than 10%. As a means of checking performance method, water samples were spiked with known concentrations of both As （Ⅲ） and As （Ⅴ）, and recovery above 94% was obtained. The proposed method was applied successfully to determine inorganic As （Ⅲ） and As （Ⅴ） in various environmental and total As in biological samples.展开更多
文摘曾经,以客观、严苛著称的美国《消费者报告》将特斯拉列为年度推荐车型,但在2015年,特斯拉Model S被移出了推荐名单,原因是"可靠性低于平均水平"满分100,特斯拉1032015年8月,在美国《消费者报告》公布的"十大最好开的车"名单中,位列第一和第二名的,均来自硅谷,而且还是同一个品牌——特斯拉Model S P85D和Model S(85kWh),前者更是凭借超出总分100分的成绩,成为美国《消费者报告》路测史上分数最高的车型。《消费者报告》通过对车辆至少50次的赛道和公路测试评估,得出了上述结论,并给出了通俗易懂的理由:比如Model S P85D从静止加速至约96km/h仅需3.5s。
文摘The purpose of this procedure was to optimize and improve a method that used for the determination of arsenic （Ⅲ） and arsenic （Ⅴ） in biological and environmental samples. The method is based on hydride generation and atomic absorption spectrometry. For both As （Ⅲ） and As （Ⅴ） the parameters such as NaBH4, HCI concentration, and pH were optimized. Absorption signal of As （Ⅴ） was approximately 17% of As （Ⅲ） signal. Therefore, for estimation of As （Ⅲ） and As （Ⅴ） concentrations in various samples the difference between the absorbance obtained for arsenic, without and with previous treatment of samples with potassium iodide （KI）, can be applied. The calibration graphs were linear （r〉0.99）, and the detection limits of the method based on three times the standard deviation of the blank were 0.14 and 0.64 μL^-1 for As （Ⅲ） and As （Ⅴ）, respectively. The relative standard deviation （R.S.D.） of measurements was less than 10%. As a means of checking performance method, water samples were spiked with known concentrations of both As （Ⅲ） and As （Ⅴ）, and recovery above 94% was obtained. The proposed method was applied successfully to determine inorganic As （Ⅲ） and As （Ⅴ） in various environmental and total As in biological samples.
