新显色剂1-(4-硝基苯基)-3-(4-羟基-6甲基-嘧啶)-三氮烯的合成及其与汞的显色反应

报道了1-(4-硝基苯基)-3-(4-羟基-6甲基-嘧啶)-三氮烯(NPHMPDT)的合成及其与汞的显色反应.在OP存在下,pH10.5的Na2B4O7-NaOH缓冲溶液中,该试剂能与汞发生显色反应,汞与NPHMPDT形成摩尔比为1:5型的淡黄色配合物,在440nm处有一最大正吸收峰,在540nm处有一最大负吸收.以450nm为参比波长,530nm为测量波长进行双波长测定,表观摩尔吸光系数为1.46×105L·mol-1·cm-1,汞的浓度在0～480μg/L范围内符合比尔定律.用拟定方法测定废水中的微量汞,结果满意.     

显色剂ABCPDT的合成及在环境监测中的应用研究

报道了新显色剂1-偶氮苯-3-(5-氰基-2-吡啶)-三氮烯的合成及其与汞的显色反应。在表面活性剂TX-100存在下,pH11.5的Na2B4O7-NaOH缓冲溶液中,该试剂与汞发生显色反应,生成21型的红色配合物。配合物的最大吸收峰位于520nm,表观摩尔吸光系数为1.90×105L·mol-1·cm-1。Hg2 质量浓度在0~600μg/L范围内符合比尔定律。用拟定方法测定废水中微量汞,结果满意。     

新试剂APNBT与汞的显色反应研究(英文)

研究新试APNBT课题与汞显色反应的最佳条件,在TrtonX—100存在下,pHl0.4～12.0范围内汞(Ⅱ)与试剂形成黄色配合物,组成为1:2,最大吸收波长为450nm,ε’为8.88×10~4L·mol~(-1)·cm~(-1),在535nm处,试剂的吸收与配合物的吸收差值最大,ε’为1.18×10~5L·mol~(-1)·cm~(-1),线性范围0～20μgHg(Ⅱ)/25mL,以双硫腙萃取汞(Ⅱ),分离干扰元素,成功地测定了合成试样和天然水中的汞,加入回收率为96％～102％。     

分光光度法测定工业废水中的汞

在β-环糊精和聚乙烯醇存在下,在盐酸介质中基于汞-硫氰酸盐-罗丹明B的显色反应,采用分光光度法测定汞.配合物的最大吸收波长为580 nm,表观摩尔吸光系数为4.97×105L.mol-1.cm-1,汞含量在0.03～0.4 mg/L范围内服从比尔定律,线性回归方程:A=0.092ρ+0.007 1,相关系数r=0.998 4.此方法已用于工业废水中微量汞的测定,结果令人满意.     

汞与溴代十甲氨基苯基荧光酮的多元配合物的光度研究及应用

研究了了表面活性剂存在下,汞与溴代二甲氨基苯基荧光酮(BDWAF)的显色反应,在pH=10.5的缓冲体系中,Hg~Ⅱ与显色剂形成1:3稳定的紫红色配合物,配合物的λ_(max)=560nm,其表观摩尔吸光系数为1.16×10~5L.mol~(-1).cm~(-1),Hg(Ⅱ)含量在0～30μg/25ml范围内符合比尔定律,样品分析结果令人满意。     

新显色剂2-氯-4-溴苯基重氮氨基偶氮苯与汞显色反应的研究及应用

本文研究了新显色剂2—氯—4—溴苯基重氮氨基偶氮苯与汞的显色反应。在非离子表面活性剂Triton X—100存在下,于pH10.4的硼砂—氢氧化钠介质中,该试剂与汞(Ⅱ)形成2:1稳定的红色配合物,其配合物的最大吸收波长位于500nm处,表观摩尔吸光系数为8.3×10~4Lmol~(-1),cm~(-1),汞(Ⅱ)量在0—15μg/25ml范围内符合比尔定律。该法用于废水中微量汞的测定,结果满意。     

2-羟基-4-磺酰氨基苯重氮氨基偶氮苯的合成及与钴的显色反应

研究了2-羟基-4-磺酰氨基苯重氮氨基偶氮苯(HSDAA)的合成及与钴的显色反应.在Triton X-100表面活性剂存在下,pH=9.0～11.0的Na2B4O7-NaOH缓冲溶液中,试剂HSDAA与钴(Ⅱ)生成2:1型深红色配合物,配合物的最大吸收峰位于λ=540 nm处,表观摩尔吸光系数为8.69×104L·mol-1·cm-1,ρ(Co2 )为0～480 μg/L时符合比耳定律.用拟定方法测定维生素B12中的微量钴,结果满意.     

1-偶氮苯-3-(5-氰基-2-吡啶)-三氮烯的合成及其与镍(Ⅱ)离子的显色反应

报道了新显色剂1-偶氮苯-3-(5-氰基-2-吡啶)-三氮烯(ABCPDT)的合成及其与镍的显色反应.在表面活性剂TX-100存在下,pH值为11.0的Na2B4O7-NaOH缓冲溶液中,该试剂与镍发生显色反应,生成3∶1型的红色配合物,配合物的最大吸收峰位于535 nm处,表观摩尔吸光系数为1.67×105L.mol-1.cm-1.Ni2 浓度在0~480μg/L范围内符合比尔定律.用拟定方法测定合金中微量镍,结果满意.     

新试剂1-(偶氮苯基)-3-(4,5-二甲基-2-噻唑)-三氮烯的合成及其与镉的显色反应研究

报道了新试剂 1 (偶氮苯基 ) 3 ( 4 ,5 二甲基 2 噻唑 ) 三氮烯 (ABDMTT)的合成及其与镉的显色反应。在Tween -80存在下 ,PH1 1 .0的缓冲介质中 ,ABDMTT与Cd(Ⅱ )形成 3 :1的红色配合物 ,试剂与配合物的最大吸收波长分别为 43 0nm和 5 1 8nm ,表观摩尔吸光系数为 1 .69× 1 0 5L/moL·cm。Cd(Ⅱ )量在 0～ 1 2 μg /2 5mL范围内符合比尔定律。用拟定方法测定了地面水中镉的含量     

1-(4-甲基-6-羟基嘧啶)-3-(偶氮苯基)-三氮烯的合成及其与镍的显色反应

合成了新显色剂1-(4-甲基-6羟基嘧啶)-3-(偶氮苯基).三氮烯(MHPPAT),并研究了它与镍的显色反应.在pH=10.5的Na2B4O7-NaOH缓冲溶液中,Tween-80表面活性剂存在下,试剂与镍生成1:1型紫红色配合物.配合物的最大吸收峰位于540nm,表观摩尔吸光系数为2.16×105L·mol-1·cm-1.Ni2 浓度在0～440μg/L范围内符合比尔定律.用拟定方法测定铝合金中微量镍,结果满意.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-