查询词典 acidity

Merlot is relatively thin-skinned and has slightly lower tannin and natural acidity. Merlot-based wine is mouth-filling, voluptuous in palate and its complex fruit flavors of berry, plum and currant is aromatically similar to Cabernet Sauvignon.

梅乐的特点是皮薄、丹宁较低、酸度也相对较低，酿出的红酒有圆润肥美、柔顺的口感，果香足，香气与赤霞珠近似，以黑色浆果为主，从黑莓、蓝莓、黑醋栗，到李子等等。

From acidity to Australian Shiraz, oak to Oregon Pinot, Robinson delivers chapters of information and theory, intermingled with shaded "Practice" exercises, presented in a style as off-dry as one of the author's beloved Rieslings (the tannin in a lesser vintage Barolo is "like sucking on a matchstick").

从酸性澳大利亚设拉子，橡木俄勒冈州黑比诺，罗宾逊提供信息和理论篇章，混杂着阴影的&实践&演习，提出过一个风格，作为作者的心爱的雷司令干在一个较小的葡萄酒（单宁巴罗洛&就像吸上一火柴棍&）。

Experimental results show that the incorporation of appropriate amounts of Al~2O~3 into SO~4^2^-/ZrO~2, SO~4^2^-/TiO~2 and SO~4^2^-/Fe~2O~3 is helpful for stabilizing the sulfur species and increasing the effective acid sites on the catalyst surfaces, which can improve the strong acidity and catalytic activity in benzoylation.

实验表明，向SO~4^2^-/ZrO~2，SO~4^2^-/TiO~2和SO~4^2^-/Fe~2O~3中引入适量的Al~2O~3，有助于稳定样品表面的含硫物种，增加样品表面的有效酸位，提高样品的强酸性和对甲苯的苯甲酰化的反应活性。

Microcalorimetric measurements of NH~3 adsorption on catalysts reveal that the remarkable strong acidity and catalytic activity of the Al- promoted catalysts are caused by a change of distribution of acid site strengths and an enhancement in the number of strong and intermediate-strong acid sites effective for the n-butane isomerization and benzoylation of toluene.

NH~3吸附微量热结果表明，Al促进样品的强酸性和催化活性的显著提高是由于样品表面的酸位强度分布发生了变化，有利于正丁烷异构化反应和苯甲酰化反应的中强酸位和强酸位的酸量显著增加。

The influence of acidity and concentration on fluorescence and absorption spectra were investigated. Using quinine bisulphate as a reference, fluorescence quantum yield of aesculetin in the condition of pH=9.32 was determined to be 0.13 at excitation wavelength 365nm.

考察了酸度与浓度对其荧光性质和吸光性质的影响，以硫酸奎宁为参比，测得秦皮乙素水溶液在pH=9.32，激发波长365nm条件下的荧光量子产率为0.13。

The influence of acidity on fluorescence and absorption spectra were investigated. Using quinine bisulphate as a reference, fluorescence quantum yield of aesculin in the condition of pH=4.96 was determined to be 0.76 at excitation wavelength 335nm, and in pH=9.40 was 0.80 at 375nm.

探讨了酸度与浓度对其荧光和吸光性质的影响，以硫酸奎宁为参比，测得秦皮甲素水溶液的两种强荧光型体的荧光量子产率，在pH=4.96，激发波长335nm条件下，荧光量子产率为0.76；在pH=9.40，激发波长375nm条件下，荧光量子产率为0.80。

SO〓〓/M〓O〓 solid superacid was applied to the photocatalytic oxidation of organic pollutants for the first time. Porous SO〓〓/TiO〓 solid superacid catalysts with high specific surface area were prepared by sol-gel method. The photocatalytic degradation of bromomethane was used as model reaction. The influence of impregnation with H〓SO〓 solution on the structure of catalysts and their photocatalytic performance was systematically studied by using X-ray diffraction, X-ray photoelectron spectroscopy, N〓 sorption analysis applying BET method, UV-Vis diffuse reflectance spectroscopy, FTIR spectroscopy, O〓-TPD and photocatalytic activity measurement. The acidity of TiO〓-based catalysts was investigated by Hammett indicator method, NH〓-TPD and IR spectra of pyridine adsorbtion. The mechanism of superacidifing effects on photocatalytic performances such as the photocatalytic degradation rate of bromomethane, apparent kinetic constant and apparent quantum efficiency was discussed.The results indicated that SO〓〓 is combined with metal ions of TiO〓 in a chelating bidentate mode.

本文首次将SO〓〓/MxOy型固体超强酸催化剂用于光催化氧化有机污染物研究，采用溶胶-凝胶法制备了具有多孔性和大比表面结构的二氧化钛基固体超强酸光催化剂SO〓〓/TiO〓，以光催化降解溴代甲烷为模型反应，系统地研究了H〓SO〓浸渍处理对催化剂表面酸性及其气相光催化性能的影响，结合XRD、BET、XPS、FTIR、Hammett指示剂法、吡啶吸附红外光谱、NH〓-TPD、O〓-TPD、紫外可见漫反射光谱等多种表征手段，深入地讨论了超强酸化对TiO〓的改性机理，阐明了引起SO〓〓/TiO〓超强酸催化剂光催化降解溴代甲烷的转化率、表观反应速率常数和表观量子效率变化的本质原因。

The apparent quantum efficiency of SO〓〓/TiO〓 was 10 times of that of TiO〓 catalyst for the photocatalytic degradation of bromomethane. Therefore, the SO〓〓/TiO〓 superacid catalyst is promising for practical application in environmental remediation.It was found that both L and B acid sites exist on SO〓〓/TiO〓 photocatalyst while only L acid sites on TiO〓 photocatalyst. On the basis of experimental results, the synergistic model of superacidic centers was proposed for SO〓〓/TiO〓 photocatalyst to explain the photocatalytic behavior and the mechanism of superacidifing effects, assuming that the adjacent L and B acid sites induced by SO〓〓 comprise cooperatively the superacidic center on superacid photocatalyst. The group cooperation of the superacidic center could strengthen the surface acidity, increase surface acid sites and the adsorbtion of O〓, promote separation of photogenerated electron-hole pair, enhance the interfacial transfer of charges and reversibility of water adsorption. Consequently the excellent photocatalytic activity, reaction stability and resistibility to humidity of SO〓〓/TiO〓 superacid photocatalyst may attributed to the group cooperated effect of the superacidic center on the photocatalyst.

研究结果表明：SO〓〓与TiO〓表面的结合为螯合式双配位结构；TiO〓光催化剂表面经H〓SO〓浸渍处理后，提高了表面酸性，改善了催化剂结构和光催化性能，当H〓SO〓浸渍浓度为1.0mol.L〓、烧结温度为450℃时，可制得SO〓〓/TiO〓超强酸催化剂(H〓＜-12.14)，其结构和光催化活性得到明显改善，与TiO〓相比，SO〓〓/TiO〓光催化剂的锐钛矿含量高、晶粒小、BET比表面积大、孔径分布集中、光谱吸收边蓝移，具有优异的光催化氧化活性、稳定性及抗湿性能，光催化降解溴代甲烷的表观量子效率比TiO〓催化剂提高了一个数量级，是一种有实际应用前景的高效光催化剂；由此提出了SO〓〓/TiO〓超强酸催化剂表面集团协同作用的超强酸中心模型，认为在SO〓〓/TiO〓超强酸催化剂表面，由SO〓〓诱导的相邻L酸中心和B酸中心组成了集团协同作用的超强酸中心，其集团协同作用显著地增强了催化剂表面酸性、增大了表面酸量及O〓吸附量、促进了光生电子和空穴的分离及界面电荷转移，具有可逆吸附水的性能，是SO〓〓/TiO〓超强酸催化剂具有优异的光催化氧化活性、很好的活性稳定性及抗湿性能的重要原因。

Toffee, marmalade and brule in addition to ripe fruit ·Very sweet but should have balancing acidity at finish

除熟水果外，还有太妃糖、酸果酱和烤焦味·很甜，但后味有起平衡作用的酸味

GA treatment restrained the respiration rate and ethylene production. 100mg.L-1ABA and 1000 L.L-1 ethephon evidently increased TSS and total titratable acidity acid content of green-mature fruit. The effect of ABA was more significantly than 1000 L .L-1ethephon, this suggested'ABA was the main hormone of influencing scenescence of'brumal jujube'fruit.

白熟冬枣采后冷藏过程中，内源ABA含量逐渐上升，贮藏后期有峰值出现；IAA和GA含量呈逐渐下降趋势；乙烯利和ABA处理都促进了内源ABA的积累和IAA和GA含量的下降，而ABA的作用比乙烯利明显；说明ABA调控果实的衰老是通过影响内源激素的变化而起作用的。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。