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sna
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  “sna”译为未确定词的双语例句
     SNA?
     SNA;
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     Result: SNA increased by 1.42±0.30(°),SNB increased by 1.9±0.21(°)and ANB improved by 3.32±0.18(°);
     结果:治疗后SNA平均增加1.42±0.30(°),SNB平均减小1.9±0.21(°),ANB增加3.32±0.18(°);
短句来源
     those of NsLs-FH to SNA and L1-NB were 0.569 and 0.283;
     NsLs-FH与SNA和L1-NB成正相关,r值分别为0.569和0.283;
短句来源
     SNA, ANB and MP-SN were increased 2.47°±0.43°, 4.01°±0.27° and 1.06°±0.67° respectively.
     SNA平均增加了 2 .47°± 0 .43° ,ANB平均增加 4.0 1°± 0 .2 7° ,MP -SN平均增加 1.0 6°± 0 .67°。
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     Integrating SNA and TCP/IP with DLSw
     用DLSw整合SNA与TCP/IP
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  相似匹配句对
     SNA?
     SNA;
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     Internet's in and SNA's out
     舍SNA而取Internet——Trane公司转向基于Internet的虚拟专用网
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为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。
  sna
The untenability of direct transfer of the bookkeeping method, which for all intents and purposes underlies the formation of the SNA balance of nonfinancial assets, to the domain of macrostatistical measurements is demonstrated.
      
A convenient and sensitive method for determination of sulfanilamide (SNA) was described based on the Mn(II)-catalyzed oscillating chemical reaction.
      
An altered central hypercapnic chemoreflex modulation of sympathetic nerve activity (SNA) might be an explanation.
      
A positive LBNP response was defined as an abrupt drop in systolic blood pressure associated with a decrease in heart rate and/or a decrease in SNA.
      
Baseline SNA and arterial baroreflex sensitivity were not different between the 2 groups.
      
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In this investigation, the surface-chemical properties of the mixed aqueous solutions of n-octyltrimethylammonium bromide (C_8 NMe_3Br) and sodium n-octylsulfate (C_8 SNa) have been studied. Some peculiar properties have been observed: (1) there is a very high surface activity of the mixed surfactants. The cmc of 1:1 (molar ratio) mixture is 7.5×10~(-3) m(cmc of C_8NMe_3Br: 2.6×10~(-1) m). The surface and interfaeial tension of 1:1 mixture are very low—down to ~23 and ~0.2 dyne/cm, whereas those of the...

In this investigation, the surface-chemical properties of the mixed aqueous solutions of n-octyltrimethylammonium bromide (C_8 NMe_3Br) and sodium n-octylsulfate (C_8 SNa) have been studied. Some peculiar properties have been observed: (1) there is a very high surface activity of the mixed surfactants. The cmc of 1:1 (molar ratio) mixture is 7.5×10~(-3) m(cmc of C_8NMe_3Br: 2.6×10~(-1) m). The surface and interfaeial tension of 1:1 mixture are very low—down to ~23 and ~0.2 dyne/cm, whereas those of the single ionic surfactant solution (at cmc or above) are ~40 and ~10 dyne/em, respectively; (2) the bubble-life and the drop-life of 1:1 mixture are both much longer than those of the single surfactant solution; (3) the 1:1 mixture has a much better wetting power on paraffin wax than a single ionic surfactant solution; (4) the total surface and interracial adsorptions of the non-1:1 mixture are nearly equal to those of the 1:1 mixture, in most cases the surface and interfacial tensions are very low, and the surface mole-ratio of C_8NMe_3~+ to C_8S~- approaches 1:1; and (5) there is no obvious effect upon the surface and interfacial adsorptions and cmc by adding an inorganic salt (NaBr) to the solution of the mixed surfactants. The Gibbs equation should be written as:-dγ=RTΓ_(Total)d In mC_5NMe_3~+(or C_8S-) rather than the 2RT form as applied in the case of an ionic surfactant. From this equation the minimum average "molecular" area of the surface film of 1:1 mixture has been calculated to be 27~29 ~2, which is much smaller than that of a single ionic surfactant (in general, >40~2), indicating a closer packing of the surfactant ions on the surface.The above mentioned characteristics show that there are strong interactions between cationic and anionic surfactants in the mixed solution. The nature of these interactions is essentially due to the Columbic attractions between the positive and negative charges of the surfactant ions in addition to the hydrophobic interactions between hydrocarbon chains.

本工作研究了碳氢链较短的溴化辛基三甲铵(简写为C_8NMe_3Br)及辛基硫酸钠(简写为C_8SNa)混合水溶液的一些表面化学性质:在表面及“油-水”界面上的混合吸附、在表面上的气泡寿命和在界面上的液滴寿命以及溶液在石蜡表面上的润湿性能。从这些性质了解正、负离子表面活性剂的相互作用。结果表明:(1)混合表面活性剂有很高的表面活性。1:1C_8NMe_3Br-C_8SNa混合物的临界胶团浓度(cmc)为~7.5×10~(-3)m,远小于单一表面活性剂。在此浓度时,表面张力低达~23达因/厘米;溶液-正庚烷的界面张力更低,达~0.2达因/厘米,亦远低于单一表面活性剂;(2)混合表面活性剂溶液有很高的气泡寿命及液滴寿命,亦即有较大的表面膜及界面膜强度;(3)混合溶液比单一表面活性剂的润湿性能好;(4)不同比例的C_8NMe_3Br-C_8SNa混合溶液的表(界)面总吸附量与1:1混合溶液的相近,当浓度较大时,吸附层中两者比例大多接近1:1,且表(界)面张力亦甚低:(5)与一般离子型表面活性剂的情形完全不同,无机盐对1:1混合溶液的表(界)面张力影响很小。计算吸附量时,Gibbs公式应取1RT形式,而不采用对一般离子...

本工作研究了碳氢链较短的溴化辛基三甲铵(简写为C_8NMe_3Br)及辛基硫酸钠(简写为C_8SNa)混合水溶液的一些表面化学性质:在表面及“油-水”界面上的混合吸附、在表面上的气泡寿命和在界面上的液滴寿命以及溶液在石蜡表面上的润湿性能。从这些性质了解正、负离子表面活性剂的相互作用。结果表明:(1)混合表面活性剂有很高的表面活性。1:1C_8NMe_3Br-C_8SNa混合物的临界胶团浓度(cmc)为~7.5×10~(-3)m,远小于单一表面活性剂。在此浓度时,表面张力低达~23达因/厘米;溶液-正庚烷的界面张力更低,达~0.2达因/厘米,亦远低于单一表面活性剂;(2)混合表面活性剂溶液有很高的气泡寿命及液滴寿命,亦即有较大的表面膜及界面膜强度;(3)混合溶液比单一表面活性剂的润湿性能好;(4)不同比例的C_8NMe_3Br-C_8SNa混合溶液的表(界)面总吸附量与1:1混合溶液的相近,当浓度较大时,吸附层中两者比例大多接近1:1,且表(界)面张力亦甚低:(5)与一般离子型表面活性剂的情形完全不同,无机盐对1:1混合溶液的表(界)面张力影响很小。计算吸附量时,Gibbs公式应取1RT形式,而不采用对一般离子型表面活性剂适用的2RT形式。由此得出的最小平均“分子”面积为27~29(?)2,表明吸附层中表面活性离子排列紧密,膜凝聚性强。上述结果充分说明正、负离子表面活性剂在水溶液中有强烈的相互作用,其本质主要在于附加的正、负电荷的库仑引力,由此导致正、负离子表面活性剂混合溶液的一系列表面化学特性。

The surface and bulk properties of the mixed aqueous solutions of cationic and anionic surfactants containing double hydrocarbon chain di-n-hexyl sodium sulfosuccinate [(C_6)_2SNa]—di-n-octyl-hydroxyethyl-methylammonium chloride [(C_8)_2NCl] system and (C_6)_2SNa—n-octyl-hydroxyethyl-dimethyl-ammonium chloride [C_8NCl] system have been studied.

本文研究了具有双烃链的正、负离子表面活性剂混合水溶液的表面和液相性质。负离子表面活性剂是琥珀酸二己酯磺酸钠[简写为(C_6)_2SNa],正离子表面活性剂是氯化二正辛基羟乙基甲基铵[(C_8)_2NCl]和氯化辛基羟乙基二甲基铵[C_8NCl]。为了增加复合物的溶解度,在铵基上引入了羟乙基。测定了表面张力-浓度关系,用Gibbs公式计算了表面吸附量和吸附分子面积。结果表明,由于正、负表面活性离子之间的强烈相互作用,所研究的两种混合物体系的表面活性远高于单独的表面活性剂。在等摩尔混合和离子强度0.1mol/kg情况下,(C_6)_2SNa-(C_8)_2NCl体系的吸附层组成是对称的(摩尔比为1∶1),且在临界胶团浓度(cmc)以上析出新相,表明此cmc实质上是复合物的溶解度;而(C_6)_2SNa-C_8NCl体系的吸附层为不对称组成(摩尔比非1∶1),在cmc以上可能形成相当大的胶团。两种体系混合溶液的起泡性有极大差异。

The surface adsorption and micelle formation of mixed solution of cationic and anionic surfactants (dodecyl-trihydroxyethylammonium chloride-sodium dodecylsulfate system and dodecyltrihydroxylethyianamonium chloride-sodium octylsufate system have been investigated.The surface tension of the aqueous solution has been determined by drop-volume method. The total mixed adsorption and the individual adsorption have been calculated by applying Gibbs equation, and the critical micelle concentrations of the mixed solutions...

The surface adsorption and micelle formation of mixed solution of cationic and anionic surfactants (dodecyl-trihydroxyethylammonium chloride-sodium dodecylsulfate system and dodecyltrihydroxylethyianamonium chloride-sodium octylsufate system have been investigated.The surface tension of the aqueous solution has been determined by drop-volume method. The total mixed adsorption and the individual adsorption have been calculated by applying Gibbs equation, and the critical micelle concentrations of the mixed solutions have been determined.It is shown that (1) The surface activity of the mixture of cationic and anionic surfactants is rather high. The cmc of the equi-molar C12NE-C12SNa sloution is 4.0×10-5m, far lower than the cmc of C12SNa or sole C12NE solution. The mixed cmc is 1/208 of that of C12SNa and 1/240 of C12NE. The cmc of the equi-molar C12NE-C8SNa solution is 7.4×10-4m, also far lower than the cmc of the single surfactant solution. It is 1/13 of the cmc of C12NE and 1/189 of that of C8SNa. (2) As a mixed solution of cationic and anionic surfactants with the same number of carbon atoms (such as C12NE-C12SNa), the total adsorption (saturated) is nearly 6.7 ×10-10mol/cm2 irrespective of the mix ratio of the two components, and there is nearly equi-molar adsorption in adsorption layer, the area occupied by each molecule is 25A, This close packing of molecules in the surface layer is due to the strong mutual interaction between the surface active cations and anions. For the mixed solution of cationic-anionic surfactant with different hydrocarbon chain length (such as C12NE-C8SNa), the total adsorption (saturated) is all nearly 5.4 × 10-10mol/cm2 with different mixed ratio of the two components, Because of the two components have different surface activity, the adsorption of cationic and anionic surfactant in surface layer are not equi-molar, the ratio is Γc12NE/Γc8SNa=1.3, the surface active ion with a longer hydrocarbon chain adsorbs preferentially at the surface. (3) The introduction of hydroxyethyl group into the hydrophilic part of the cationic surfactant makes the 1:1 mixture more hydrophilic and more soluble. Thus a solution of 1:1 C12NE-C12SNa can be prepared with a concentration of 2.64 10-4m. This is about 6.6 times of the cmc of mixture. The solution had been leaved there for two years, no turbidity was observed.

本工作研究了十二烷基三羟乙基氯化铵(C_(12)NE)和十二烷基硫酸钠(C_(12)SNa),十二烷基三羟乙基氯化铵(C_(12)NE)和八烷基硫酸钠(C_8SNa)两体系的正、负离子表面活性剂混合溶液的表面吸附和胶团形成。用液体积法测定了一系列不同比例C_(12)NE~C_(12)SNa、C_(12)NE~C_8SNa混合水溶液在25℃、总离子强度为0.1000m时的表面张力,用Gibbs公式计算了总吸附量和分吸附量。另外,初步探索了混合溶液的某些胶团性质。结果表明: 1.正、负离子表面活性剂混合物具有较高的表面活性。等摩尔C_(12)NE~C_(12)SNa混合溶液的cmc为4.0×10~(-5)m,分别为单个C_(12)SNa、C_(12)NEcmc的1/208和1/240。等摩尔C_(12)NE~C_8SNa混合溶液的cmc为7.4×10~(-4)m,分别为单个C_(12)NE、C_8SNa cmc的1/13和1/189。 2.对于碳原子数相同(如C_(12)NE~C_(12)SNa)的正、负离子表面活性剂的混合溶液,不论其混合比例如何,在饱和吸附时,总吸附量接近6.7×10~(-10)mol/cm~...

本工作研究了十二烷基三羟乙基氯化铵(C_(12)NE)和十二烷基硫酸钠(C_(12)SNa),十二烷基三羟乙基氯化铵(C_(12)NE)和八烷基硫酸钠(C_8SNa)两体系的正、负离子表面活性剂混合溶液的表面吸附和胶团形成。用液体积法测定了一系列不同比例C_(12)NE~C_(12)SNa、C_(12)NE~C_8SNa混合水溶液在25℃、总离子强度为0.1000m时的表面张力,用Gibbs公式计算了总吸附量和分吸附量。另外,初步探索了混合溶液的某些胶团性质。结果表明: 1.正、负离子表面活性剂混合物具有较高的表面活性。等摩尔C_(12)NE~C_(12)SNa混合溶液的cmc为4.0×10~(-5)m,分别为单个C_(12)SNa、C_(12)NEcmc的1/208和1/240。等摩尔C_(12)NE~C_8SNa混合溶液的cmc为7.4×10~(-4)m,分别为单个C_(12)NE、C_8SNa cmc的1/13和1/189。 2.对于碳原子数相同(如C_(12)NE~C_(12)SNa)的正、负离子表面活性剂的混合溶液,不论其混合比例如何,在饱和吸附时,总吸附量接近6.7×10~(-10)mol/cm~2,吸附层中也是近于等摩尔吸附,每个分子所占面积约为25A~2,这是由于正、负表面活性剂离子之间相互强烈作用导致表面层中成紧密排列结构。 碳原子数不同的正、负离子表面活性剂(如C_(12)NE~C_8SNa)的混合溶液,不论其比例如何,其饱和吸附时总吸附量接近5.4×10~(-10)mol/cm

 
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