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constant ratio     
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  常数比
     Using the strong coupling expansion method and Pade' approximant of lattice QCD, we calculate the decay constant ratio of π over ρ, i. e., fπmρ/fρ, and obtain a result which is consistent with experiment.
     本文用格点色动力学的强耦合展开方法和pade′近似,计算π和ρ介子衰变常数比f_πm_ρ/f_ρ,得到与实验相近的结果.
短句来源
     The results of calculation show that the optimal filling factor is 0.78 for equilateral triangular two-dimension photonic crystal when dielectric constant ratio is 13:1,and the widest band gap is 0.094(Δωa/2πc).
     计算表明 ,对于空气柱等边三角形二维光子晶体 ,当介电常数比为 13:1时 ,最佳填充比为 0 .78,最大带宽是 0 .0 94 (Δωa/2πc) ;
短句来源
     Because the conventional photoelastic materials have a stress-optical constant ratio B/A of about - 0.5 in the frozen state, the three-dimensional stresses could not be determined by analyzing the holo-photoelastic patterns of slices cut from three dimensional model of these materials.
     本文介绍了进行三向应力分析的全息光弹性方法及有关技术,着重分析了全息光弹性方法用于三向应力分析的主要困难在于冻结材料的应力光学常数比B/A接近-0.5,还提供了一种新的光弹性材料制作和冻结工艺,这种材料冻结时的应力光学常数比可以远离-0.5。
短句来源
     The relation between complete bandgap and three main influence factors,lattice structure,fill ratio,dielectric constant ratio of 2D dielectric-column photonic crystals with GaAs,Si,Ge,is studied using Bandsolve software,respectively.
     利用Bandsolve软件分别优化计算得到GaAs、Si、Ge三种材料的二维介质圆柱型光子晶体完全禁带与晶格结构、填充比、介电常数比三个主要影响因素之间的关系。
短句来源
     Because conventional photoelastie materials have a stress-optical constant ratio B/A of about - 0.5 in the frozen state, three dimensional stresses could not be determined by analyzing the holo-photoelastic patterns of slices cut from three dimensional models made of these materials.
     本文介绍了进行三维应力分析的全息光弹性方法及有关技术,分析了全息光弹性方法的主要困难在于冻结材料的应力光学常数比B/A接近-0.5,并提供了一种新的光弹性材料制作和冻结工艺。
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  恒比
     This paper presents a new scheme of encoding and decoding of constant ratio code by the minimization principle of combinational logical networks.
     本文根据组合逻辑网络的最小化原理,提出了一种编,译恒比码的新方案。
短句来源
     Using the technology of error correcting coding, this paper analyzes adaptabilities about the constant ratio code and the odd-even check code It expounds the design of the long-distance monitoring system and hardware-software using the technology The autocontrol, the long-distance communication and the antijamming are discussed
     本文应用纠错编码技术 ,分析了恒比码和奇偶校验码的适用性 ,介绍了运用这一技术开发的远程监测系统及软硬件的设计 ,讨论该系统的自动控制、远程通讯、抗干扰等问题。
短句来源
  恒速比
     By mathematical analysis, this paper synthesizes a type of five-bar-gear transmission mechanism with particularly geometric dimension relations, when it is used as the bearing body of four-gear transmisson on it, this type of combined mechanism can realize a constant ratio under varied shafts distance.
     从数学分析上综合了一种特殊几何尺寸关系的五杆齿轮连杆机构,当以其为传动齿轮的支承架时,该组合机构能实现任意时变轴距下的恒速比传动。
短句来源
  定比值
     The characteristic relationships regarding the constant ratio and the constant error-difference for the system have been deduced.
     得出该系统的定比值关系和误差的差值不变的特性关系。
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      constant ratio
    The analogous effect is found upon increasing relative content of tetraethoxysilane with a constant ratio between two trifunctional silanes.
          
    Sodium silicate glasses with a constant ratio of oxide concentrations (mol %) SiO2/Na2O = 2.4 and with copper ions introduced in the form of CuO (from 1 to 10 mol %) are studied by the EPR method.
          
    The momentum distribution of kaons in the proton and the coupling-constant ratio fKΛN/fKΣN are determined on the basis of the 3P0 quark model of meson-baryon coupling.
          
    It was found that introduction of hydrogen into the plasma leads to a decrease in the average size of Pt nanoclusters for a constant ratio between the carbon and platinum concentrations in the nanocomposite.
          
    Individual patients maintained a constant ratio of NA to A in plasma from pre-induction to tumour handling (r = 0.916,p >amp;lt; 0.0001).
          
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    When ceric iodate is precipitated from acid solution by the addition of asoluble iodate,a gelatinous precipitate is obtained,which is difficult to filterand wash.The precipitate must be redissolved and reprecipitated as oxalatefor final ignition to ceric oxide.A method has been deviced to improve the form of the ceric iodateprecipitate by slow precipitation in homogeneous solution.Advantage is takenof the fact that cerium exists in two distinct valence states,the cerous and theceric.Cerous iodate is soluble...

    When ceric iodate is precipitated from acid solution by the addition of asoluble iodate,a gelatinous precipitate is obtained,which is difficult to filterand wash.The precipitate must be redissolved and reprecipitated as oxalatefor final ignition to ceric oxide.A method has been deviced to improve the form of the ceric iodateprecipitate by slow precipitation in homogeneous solution.Advantage is takenof the fact that cerium exists in two distinct valence states,the cerous and theceric.Cerous iodate is soluble in dilute acid solution,while ceric iodate isinsoluble.Cerium is first reduced to the cerous state by hydrogen peroxide innitric acid solution.Ammonium iodate is added and no precipitation occurs atthis moment.The precipitation is brought about by the slow formation ofceric ion in the iodate solution by ammonium persulfate.Thus a denseprecipitate is formed slowly.This compact volume of the precipitate facilitatesfiltration and washing.The precipitate is ignited directly to ceric oxide,part of which is always stained with a brown color.This is remedied by evapora-tion of the ignited precipitate to dryness with a few drops of concentratedsulfuric acid and ignition to ceric oxide for final weighing.For samples containing 10-50 mg of ceric oxide,a total volume of 300-400 ml gives best results.The optimum concentration of the nitric acid presentis 0.4-0.5 N.A starting temperature of 40-60℃ favors the denseness of theprecipitate.Precipitation is continued at an elevated temperature(70-80℃ )on a hot plate.Stirring not only improves the crystallinity of the precipitateand may decrease the occlusion of impurities,but also shortens the time forcomplete precipitation.Dilute iodic acid solution(1-2%)is used as washsolution.This method is good for samples containing 2.5-250 mg of cericoxide.The composition of the precipitate is not reproducible.The precipitate is abasic iodate and the ratio of IO_3~-found/IO_3~- theoretical for Ce(IO_3)_4 increaseswith the concentration of the nitric acid present(up to 0.5 N)to a maximumvalue of about 0.92.The ratio never reaches unity.An analysis of the pre-cipitate dried at 40-45℃ for 2-3 days shows a fairly constant ratio of IO_3~- found/IO_3 theoretical for Ce(IO_3)_4 From the ratio of Ce:IO_3,an approximate formulaCe_2(IO_3)_7(OH)·XH_2O has been proposed for the precipitate obtained under theconditions described.The number of water molecules in the formula is in-definite,varying from 3 to 5.

    1.在均匀溶液中沉淀的碘酸铈,性质紧密,便利于过滤和洗涤。烧灼成为氧化铈后,适合于作为铈的定量分析。2.利用碘酸亚铈能溶解于稀酸溶液而碘酸铈则不溶的区别,先用过氧化氢把全部铈离子还原,再加入碘酸铵,然后进行氧化,使碘酸铈在均匀溶液中沉淀出来。3.本方法适用于含氧化铈2.5—250毫克的样品。4.所得沉淀的分子式经初步测定为 C_(e2)(IO_3)_7(OH)·x H_2O,其中 x 的数值不定,涨落在3与5之间。

    This investigation was undertaken to attain by means of pot cultures and chemical analyses a better understanding of the significance of the degree of base saturation in relation to the growth and mineral composition of certain crops. Two relatively pure mineral colloids, bentonite and kaolin, and a lucastrine orchard soil containing illitic type of clay minerals were used for the studies. Bentonite and kaolin were first electrodialyzed and then mixed with different amounts of pure quartz sand to give different...

    This investigation was undertaken to attain by means of pot cultures and chemical analyses a better understanding of the significance of the degree of base saturation in relation to the growth and mineral composition of certain crops. Two relatively pure mineral colloids, bentonite and kaolin, and a lucastrine orchard soil containing illitic type of clay minerals were used for the studies. Bentonite and kaolin were first electrodialyzed and then mixed with different amounts of pure quartz sand to give different levels of base exchange capacity. Treatments were made to all three cultural media for varying degrees of base saturation with constant ratio between exchangeable bases. Oats and rye were grown in succession in montmorillonitic and kaolinitic media, while peach, soybean, proso, tomato and oats were grown in the illitic soil. Dry weights and contents of certain mineral constituents of oats, rye and tomato were determined. Yield data from the montmorillonitic media showed nearly linear relationship between the degree of base saturation and the growth of the plants. In the kaolinitic media the increase of yield was only noticeable from the first increment of bases, effects above 40% total base saturation being insignificant. The results from illitic soil were intermediate between those mentioned above, i.e., the highest yield of tomato was obtained at the 75% saturation level. The yield data further indicate that the growth of plants was more closely related to the degree of base saturation than to the total supply of exchangeable bases. With the same amounts of bases and at the levels below 60% base saturation, the yields of rye in the kaolinitic colloid were higher than in the montmorillonitic colloid. In the montmorillonitic media, the increase of Ca uptake by the plants from the first increment of Ca was pronounced with only little effects above 30% Ca saturation (or 40% level of total base saturation). The K content of the plants was increased appreciably at only the higher levels of base saturation, while significant increases of the Mg content of the plants occured at lower levels (i.e. below 60% base saturation level). In the kaolinitic media, no appreciable change of Ca and Mg contents of the plants was noticed. This is an interesting contrast to the results obtained with the montmorillonitic media. However, there were definite increases in K content of plants with increasing increments of K at the lower levels of saturation. The higher contents of Ca and Mg in the plants were found in kaolinitic media rather than in the montmorillonitic media provided that the total base saturation level was under 60% of the exchange capacity. On the other hand, the K content of the plants from montmorillonitic media was invariably higher than from kaolinitic media. In the illitic soil, the most marked increase of Ca content in plants occured when the degree of base saturation increased from the 50% to the 75% level. Beyond that point, no appreciable increase was noticed. As the degree of base saturation of illitic soil increased, the K and Mg percentages in plants increased also. Among the conclusions obtained from the experiments, the following are of outstanding significance: 1. Exchangeable cations are not equally available. With the equal supply of total exchangeable cations, their availability varies with the degree of base saturation. Within a certain range, the higher the degree of base saturation, the greater the availability of the exchangeable cation. This affords a theoretical explanation of the advantage of localized application of fertilizers. 2. The availability of exchangeable cations varies with the nature of clay minerals. With the given amount of exchangeable cations and the same degree of base saturation, the individual exchangeable cation held by the clay mineral differs in availability according to the following order: For Ca" and K', kaolinite>montmorillonite>kaolinite. This gives the reason why a montmorillonitic soil should be fertilized with respect to the Ca and K to higher levels than a kaolinitic soil. 3. In order to afford sufficient amount of active cations for the growth of plants, higher degree of ionic saturation is required for Ca" than is for Mg", which in turn should be higher than for K'. The study also discusses, from the theoretical point of view, some of the factors involved in determining the availability of exchangeable bases.

    本研究之主要目的在于寻求不同粘粒矿物所吸附的代換性陽离子对植物生長及其矿質营养成分的影响。通过这一試驗,希望了解影响代换性陽离子的若干重要因子,从而提供关于施肥原則及技术的若干理論。试验分温室栽培及植株化学分析兩部份。栽培所用植物包括燕麦、黑麦、小米、大豆、番茄、桃树等数种,培养基根据所合粘番矿物不同,分微晶高陵土系,高陵土系及水化云母系三大类。培养基的鹽基代換率、鹽基飽和度,以及各代换性鹽基間的互相比例,均加以控制。另以砂培处理为对照,試驗的主要結果可以綜結如下: 1.在微晶高陵土系的栽培試驗里,植物的生長概和鹽基飽和度成直线相关,但高陵土系及水化云母系的栽培試驗結果并不完全如此。在这些培养基理,植物的生長,虽然也因鹽基飽和度的增加而改善,但其改善的趋势停止于一定的鹽基飽和度水平上。例如,在本試驗里,对黑麦和燕麦言,当高陵土系培养基的鹽基飽和度达到40%时,或对番茄言, 当水化云母系培养基的鹽基飽和度达到75%时,植物的生長都不再因鹽基飽和度的增加而改善了,这說明就植物的矿質营养言,鹽基飽和度具有特殊重要的意义。一般說来,鹽基飽和度愈大,代换性鹽基的有效度也愈大。 2.作为影响植物矿質营养的土埌肥力因素,鹽...

    本研究之主要目的在于寻求不同粘粒矿物所吸附的代換性陽离子对植物生長及其矿質营养成分的影响。通过这一試驗,希望了解影响代换性陽离子的若干重要因子,从而提供关于施肥原則及技术的若干理論。试验分温室栽培及植株化学分析兩部份。栽培所用植物包括燕麦、黑麦、小米、大豆、番茄、桃树等数种,培养基根据所合粘番矿物不同,分微晶高陵土系,高陵土系及水化云母系三大类。培养基的鹽基代換率、鹽基飽和度,以及各代换性鹽基間的互相比例,均加以控制。另以砂培处理为对照,試驗的主要結果可以綜結如下: 1.在微晶高陵土系的栽培試驗里,植物的生長概和鹽基飽和度成直线相关,但高陵土系及水化云母系的栽培試驗結果并不完全如此。在这些培养基理,植物的生長,虽然也因鹽基飽和度的增加而改善,但其改善的趋势停止于一定的鹽基飽和度水平上。例如,在本試驗里,对黑麦和燕麦言,当高陵土系培养基的鹽基飽和度达到40%时,或对番茄言, 当水化云母系培养基的鹽基飽和度达到75%时,植物的生長都不再因鹽基飽和度的增加而改善了,这說明就植物的矿質营养言,鹽基飽和度具有特殊重要的意义。一般說来,鹽基飽和度愈大,代换性鹽基的有效度也愈大。 2.作为影响植物矿質营养的土埌肥力因素,鹽基飽和度的重要性一般超过鹽基代換率。試驗的結果表明:鹽基代換率不等,而鹽基飽和度相等的同一發生学来源的土埌,其植物生長狀况一般相等或相差不远。这說明代換性鹽基的絕对数量不足以指示作物生長的优劣。不仅如此,試驗的結果也啟示出含代換性陽离子絕对数量相等的兩种同源土埌,就对植物的矿質营养言,并不意味着具有相等的供应該有效性陽离子的能力。由于它們間質地上的可能差異,——質地輕者鹽基代换率小,質地粘重者,鹽基代換率大,——因之其鹽基飽和度就不相等。飽和度大者,鹽基的有效度就高。 3.栽培試驗及室內化学分析的結果都表明在总鹽基飽和度为60%以下的土埌中(Ca:Mg:K=15:3:2),高陵土类粘粒矿物上的代换性Ca~(++)及Mg~(++)的有效度均高于微晶高陵土,而K~+則相反。 4.植物矿質成分的化学分析結果表明:各营养离子的鹽基飽和度在一定范圍内的变化,可以显著地影响它进入植物体內的量。例如,当微晶高陵土系培养基的鈣离子飽和度在30%以下的范圍內作增减的变动时,都能明显地反映在其所生長的植物体內的含鈣量上。植物体內的鉀离子,則能反映飽和度自4%至6%的范圍內的变化。鎂的情况大体近似于鉀,只是其变化范圍更小一些。这說明同一种植物为了滿足其自身的营养需要,对于同一种粘粒矿物上所吸附的不同离子,有不同的飽和度的要求。鈣最大,(对黑麦,燕麦而言約30%以上),鎂次之(約9%),鉀最小(約6%)。这些标准也是施肥的最低要求。 5.栽培試驗及化学分析都証明同一种离子吸附在不同的粘粒矿物上,縱然离子飽和度相等,其对植物生長和矿質养分的影响也不相等。研究結果显示出在同一离子飽和度下,不同粘粒矿物上的离子有效度大体依下列次序变化:高陵土>微晶高陵土>水化云母。在农業实踐中,不同类型的土埌所要求的施肥标准不等,在这里也得到了一些理論根据。試驗結果对于实际施肥,应有一定的指导价值。除以上主要結果外,本文还对有关代換性离子有效度的理論問題进行了討論和分析,并提出了作者自己的初步意見。

    The cell free preparation of a strain of P seudomonas fluorescens was capable of catalyzing the reduction of both NADP~+ and NAD~+ in presence of glucose-6-phospha(?)e.The reduction of both nicotinamide nucleotides is considered to be catalyzed by the same enzyme based on the following evidence.(1) No nicotiamide nucleotide transhydrogenase activity can be demonstrated in the cell free extracts of the bacteria.(2) During purification up to an electrophoretically homogeneous preparation (130-fold enrichment),...

    The cell free preparation of a strain of P seudomonas fluorescens was capable of catalyzing the reduction of both NADP~+ and NAD~+ in presence of glucose-6-phospha(?)e.The reduction of both nicotinamide nucleotides is considered to be catalyzed by the same enzyme based on the following evidence.(1) No nicotiamide nucleotide transhydrogenase activity can be demonstrated in the cell free extracts of the bacteria.(2) During purification up to an electrophoretically homogeneous preparation (130-fold enrichment), the rate of reduction of NADP~+ and NAD~+ in presence of glucose-6-phosphate has a constant ratio about 2:1.(3) The rate of the reduction of NADP~+ catalysed by the enzyme is about 2 times as fast as that of NAD~+.When both NADP~+ and NAD~+ are added simultaneously in the system, the reduction rate approximates that for NADP~+ alone.

    在一株萤光假单孢杆菌SM-102菌株中G-6-P脱氢酶能同时利用NADP~+和NAD~+作为氢递体,并非象以往文献所载在G-6-P脱氢酶催化G-6-P的氧化中所引起NAD~+的还原是由于烟酰胺核甙酸转氢酶的作用所致,这个结论是根据下列的试验结果: (一)经测定在细菌的无细胞抽提液中没有找到烟酰胺核甙酸转氢酶的存在。(二)电泳纯的酶制剂亦能同时利用NADP~+和NAD~+作为氢递体。(三)在酶的纯化过程中,G-6-P脱氢酶作用于NADP~+和NAD~+的还原速率比值始终保持在2左右。(四)G-6-P脱氢酶作用于过量辅酶的反应系统时,对NADP~+的还原速率约为NAD~+的二倍,但当NADP~+和NAD~+同时存在时,还原速率仍与NADP~+相等。作者对G-6-P脱氢酶能同时以NADP~+与NAD~+作为辅酶在糖代谢演化上的意义进行了讨论。

     
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