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     After introducing Haar, Daubechies, W5/3 and D9/7 wavelet, the article uses three steps simplified methods to realize the DWT’s fast algorithm: factoring two-dimensional calculation to one-dimensional calculation along the rows and columns of the image;
     在介绍了Haar、Daubechies、W5/3与D9/7四种类型小波之后,采用3步简化方法实现离散小波变换的快速运算:将二维变换通过行列分离转化为两次一维变换;
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     The amounts of aminophylline administered were 5 mg/kg tid in 21 children,100 mg or 200 mg tid in 44 adults.
     小儿5mg/kg/次一日三次组21例; 成人100mg 一日三次组24例,200mg 一日三次组20例。
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     112 cases with aminophylline 3-4 mg/kg a day,ohserving the different effect.
     氨茶硷组 112例 ,氨茶硷 3- 4mg/kg/次 ,一天一次 ,对比观察。
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     With the differentiability of the solution to the initial condition values, the stability and the unstability can be determined for the first constant differential equation such as d y d z =P n(x) n y+…,P 1(x)y+P 0(x) with variable coefficient.
     利用解对初值条件的可微性,得出形如 dydx=Pn(x)yn+ +P1(x)y+P0 (x)的n次一阶变系数微分方程解的稳定性和不稳定性的充分条件
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     Through study on contrast between combination multifactor and single-factor testing method of mineral processing, this paper affirms that the former is superior to the latter.
     本文通过析因组合试验法和一次一因素试验法的对比,进行了研究和探讨,认为多因素组合试验法优于一次一因素试验法。
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     The First
     第
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     first time
     第……
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     L~(-1).
     Ll。
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     一.
     .
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An investigation was made for the mid-range forecast of the heavy to torrential rain at the beginning and during the period of the "plum rains" by using synoptic circulation patterns and numerical statistics. It is found that the beginning of the rainy season is closely related with the seasonal northward displacement of the ridge line of the western North Pacific sub-tropical high between 125°-140°E at 500mb. The plum rains occur when the 500mb ridge line is generally stable between 19°-24°N and end when the...

An investigation was made for the mid-range forecast of the heavy to torrential rain at the beginning and during the period of the "plum rains" by using synoptic circulation patterns and numerical statistics. It is found that the beginning of the rainy season is closely related with the seasonal northward displacement of the ridge line of the western North Pacific sub-tropical high between 125°-140°E at 500mb. The plum rains occur when the 500mb ridge line is generally stable between 19°-24°N and end when the ridge line reaches, mostly, 26° or farther north.The forecast of early plum rains should especially be relied on the movement and variation of the sub-tropical high while that of normal or late plum rains should especially be relied on the adjustments arid movements of the westerly short-wave troughs and ridges.It should be noted that the time of the occurrence of the heavy to torrential rain synoptic process during the plum rainy season in Shanghai is related with the region in which the interaction of cold and warm air masses take place, the characteristics of their intensity variations and also with the variations of the meteorological parameters at the stations concerned.

本文是用天气环流分型、数理统计等方法,探索梅雨“开始期”和“梅雨期内大到暴雨”的中期预报。 经普查和分析研究发现,每年雨季来临早迟与500mb上125°—140°E间的西北太平洋副热带高压脊的季节性向北位移有很大关系,入梅该候500mb上125°—140°E间的副高平均脊线基本上是要稳定在19°—24°N纬度带内,而出梅候或次一候,副高脊线基本上要达到26°N以北。 对于早梅雨的预报应偏重于副高活动和变化,正常或迟梅雨的预报应偏重于西风带短波槽脊的调整和活动。 最后指出,上海地区梅雨期内大—暴雨天气过程的发生是与这个季节中冷暖空气活动的地域和其强度变化特点有着一定的联系,同时也与本站要素变化有关。

In this paper the role of summation in classical Cowell's method is discussed. It is not only proved that the second-sum formula is algebraically equivalent to the formula in which no summation is employed,but also that contrary to the tradi- tional view such algorithm cannot efficiently reduce the accumulation of round-off error.Therefore,the second-sum formula hardly has any advantage.But when the first-sum formula is used,the accumulated round-off error is about O(h) times that of primary formulas,in which...

In this paper the role of summation in classical Cowell's method is discussed. It is not only proved that the second-sum formula is algebraically equivalent to the formula in which no summation is employed,but also that contrary to the tradi- tional view such algorithm cannot efficiently reduce the accumulation of round-off error.Therefore,the second-sum formula hardly has any advantage.But when the first-sum formula is used,the accumulated round-off error is about O(h) times that of primary formulas,in which h is the step length.Here the value of partial double precision arithmetic is also discussed.This arithmetic might reduce the accumulated round-off error which is about O(h~2) times that of primary arithmetic,but in this case there is not any advantage to use the first-sum or second-sum formula.

本文讨论了经典的 Cowell 方法中和分技术的作用.证明了采用二次和分的方法不仅在代数上完全等价于不用和分的方法,而且与传统的观念相反,这样的算法并不能有效地减少舍入误差的累积,因而,使用二次和分的方法几乎没有优越性.但若采用一次求和的方法,舍入误差的累积能改善 O(h)倍(h 为积分步长).本文亦讨论了部分双倍位算法的作用,它能使舍入误差的累积改善 O(h~2)倍,但此时采用二次、一次和分都没有任何好处.

It is considered in this Paper that the poor and good harvest ofwinter wheat in Shanxi Province depends on the key factor-autumnrainfall in the sowing stage and the early growing period of young seed-lings (from the middle of September to late November), with the droughtequivlant of 75 mm based on an analysis of rainfall information of 867years of 43 county weather stations and the winter wheat yielding infor-mation by means of the principle of drought equivalent of the well-known ecologist G. Azzi. The second...

It is considered in this Paper that the poor and good harvest ofwinter wheat in Shanxi Province depends on the key factor-autumnrainfall in the sowing stage and the early growing period of young seed-lings (from the middle of September to late November), with the droughtequivlant of 75 mm based on an analysis of rainfall information of 867years of 43 county weather stations and the winter wheat yielding infor-mation by means of the principle of drought equivalent of the well-known ecologist G. Azzi. The second important stage is the rainfall(from December to February next year) in the winter dormancy withthe drought equivalent of 40 mm.In the above growing period of winter wheat, it can be divided intothe rare belt of drought frequency (2.5-5), the intermediate-long belt ofdrought frequency (2.5-5) and the usual belt of drought frequency (7.5)according to the drought frequency (still less than 2.5) from the southto the north. It can be further zonifized into the microarid region, thelight-arid region, the arid region and aridest region for winter wheatin Shanxi Province based on the relationships between the drought fre-quency and distribution of winter wheat.The geographical experiment illustrated that the selection of wheatvarieties of rainfed lands and the climatic constraints are the first, butthe soil constraints are the second. It is obvious that reduction withless in the drought year or even reduction without any yield can entirelybe avoided by the use of drought-resistant varieties against drought anddryness under the existing conditions. On the other hand, if, in a goodyear, the unsuitable varieties are selected, the favourable rainfall watermay not be used to the fullest extent, so that the due bumper harvestcan not be won. The non-extreme drought is a common phenomenon, theoccurrence and frequency of which have a close relation with the fluc-tuation of yields of winter wheat.

本文根据43个县气象站867年次的隆水资料和小麦产量资料进行分析,运用了阿齐(G.AZZI)的干旱当量方法,认为决定山西小麦丰歉关键的降水是播种期至幼苗生长初期(中/9—下/11)的秋雨,干旱当量为75毫米。次一个重要时期是冬季休眠期(12—2月)的降水,其干旱当量为40毫米。 在上述小麦生育期中,根据干旱频率(级差2.5)从南至北划分为干旱频率稀少带(频率指标1—2.5)、干旱频率中常带(2.5—5)和干旱频率经常带(>5)。根据山西小麦干旱频率带与小麦分布的关系,进一步区划为山西小麦微旱区、轻旱区、干旱区和最旱区。 通过地区性试验表明,旱地小麦品种的选择应该重视气候制约和土壤制约。显然,用抗旱品种对付干旱,可以做到在现有条件下,旱年少减产,甚至不减产,是大面积经济有效的抗旱措施。另一方面,在丰年若品种选用不当,则不能充分利用有利的降水,因而不能得到应有的丰收。 非特大性的干旱是经常发生的,其发生的时间和频率与常年小麦产量的起伏关系十分密切。

 
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