以黄连素为荧光探针测定配合物的平衡常数

以黄连素（BER）为荧光探针,研究了碱金属离子、铵离子和黄连素在葫芦脲[7]中的包合竞争反应.发现葫芦脲[7]与黄连素在一定的条件下能生成稳定的CB[7]-BER荧光探针体系,且具有强的荧光发射.然而分别将碱金属离子,铵离子加到CB[7]-BER包合物体系中时,荧光强度呈现有规律的下降,且荧光猝灭值ΔF与阳离子的浓度呈良好的线性关系,以此为基础,研究了碱金属离子和葫芦脲[7]相互作用的平衡常数,发现对于同一主族元素,随着原子半径的增大,与葫芦脲[7]形成配合物的平衡常数也依次增大、銨离子与葫芦脲[7]形成的平衡常数介于钠离子和钾离子之间。     

光谱法研究葫芦脲对褪黑素的分子识别作用

采用荧光光谱、紫外吸收光谱法研究了葫芦[5]脲、葫芦[6]脲、葫芦[7]脲分别与褪黑素的相互作用,考察了溶液的pH值、常用溶剂等对包合物的形成及荧光强度的影响.实验结果表明,褪黑素与葫芦[7]脲不发生作用,而与葫芦[5]脲和葫芦[6]脲发生相互作用,均形成物质的量比为1:1的稳定的包合物.     

以葫芦[7]脲-盐酸巴马汀为荧光光探针测定特非那定

盐酸巴马汀在水溶液中仅有微弱的荧光发射,加入葫芦[7]脲后荧光显著增强.然而,在葫芦[7]脲和盐酸巴马汀的混合体系中加入特非那定后发现体系的荧光强度明显减弱.基于这一性质,以葫芦[7]脲-盐酸巴马汀为荧光分子探针建立一种操作简单、灵敏度高的检测水溶液中特非那定的荧光光谱法.实验结果表明,特非那定浓度C与荧光猝灭值ΔF呈...     

葫芦[5]脲与白屈菜红碱包和作用的荧光光谱法研究

采用荧光光谱法研究了葫芦[5]脲和白屈菜红碱的包和作用.结果表明,葫芦[5]脲和白屈菜红碱可形成1∶ 1稳定的包合物,表观包合常数为1.23 × 104 M-1.据此建立了水溶液中高灵敏度测定白屈菜红碱的荧光光谱法.在最佳条件下得到其线性范围为1.0 ng·mL-1～1400 ng·mL-1,检出限为0.28 ng·mL-1.该方法成功地用于尿液和血浆中白屈菜红碱的测定,平均回收率为102.1%和101.6%,S.D低于2.0%.     

系列瓜环与甲基黄作用体系研究

利用1H NMR技术和紫外-可见吸收光谱法考察了七元瓜环(Q[7])及对称四甲基六元瓜环(TMeQ[6])与甲基黄的分子包结作用,以及体系pH值对主客体作用的影响.结果表明,在体系pH约为1的条件下, Q[7]、TMeQ[6]与甲基黄均有明显的主客体相互作用,形成了1∶1的包结配合物,包结常数KQ[7]-g为3.54×106 L·mol-1,KTMeQ[6]-g为2.50×106 L·mol-1.测试了上述客体与不同瓜环作用体系的线性范围和检出限.     

苄氧基葫芦[6]脲的合成及其结构表征

以葫芦[6]脲与过二硫酸钾合成了羟基葫芦[6]脲,以氢化钠、二甲基亚砜与羟基葫芦[6]脲为原料,反应得到烷基化衍生物;将氯化苄加入此溶液中,在室温下反应合成了新型的化合物苄氧基葫芦[6]脲.其结构经荧光光谱图、紫外光谱图、红外谱图、核磁共振谱图以及质谱图分析得到了确证.     

L-Cys-CdS纳米荧光探针的微波制备及荧光猝灭法测定金属离子

用微波法以L-半胱氨酸为稳定剂,硫代乙酰胺为硫源,合成了L-Cys-CdS纳米荧光探针,透射电镜(TEM)测得其粒径大小为40 nm,研究了微波反应时间、初始反应pH值和调节pH值对合成L-CysCdS纳米荧光探针荧光强度的影响.结果表明,L-Cys-CdS纳米荧光探针的最佳合成条件为初始反应pH=8.5,微波反应时间15 min,调节pH=7,且Cu2+(53~427μg·L-1),Ag+(180~1 620μg·L-1),Fe3+(93.3~1 586μg·L-1)在一定条件下对该纳米荧光探针的荧光猝灭为线性,该方法简便易操作,可用于Cu2+,Ag+,Fe3+的微量测定.     

基于点击化学的炔雌醇荧光传感器

炔雌醇是一种环境干扰物,高浓度的炔雌醇会对环境、生物等造成一定的伤害.根据Cu(I)可以催化炔雌醇与带叠氮基团的叠氮香豆素之间的点击化学反应(Cu AAC反应),生成具有1,2,3–三唑五元环的大分子结构化合物.由于整个分子中共轭结构的增加,使得反应后体系的荧光信号增强.通过检测反应前后荧光信号的变化,可以实现对炔雌醇的高灵敏检测.在最佳条件下,传感器的相对荧光强度与炔雌醇的质量浓度在0.1~2.5μg·L-1范围内具有良好的线性关系,检测限为0.05μg·L-1.     

臭氧、活性炭、超滤及联用工艺去除邻苯二甲酸酯的效能与机理

为提高水厂对邻苯二甲酸酯类环境激素的处理效果,研究臭氧、活性炭、超滤及2种联用工艺对PAEs(DMP、DEP、DBP、DEHP)的去除效果及降解机理.结果表明,单独的臭氧氧化、活性炭吸附、超滤过滤均能去除部分PAEs,最优工艺参数:臭氧投加量8 mg·L-1,空床停留时间15 min,超滤操作压力0.01 MPa.当PAEs进水浓度分别为10μg·L-1、15μg·L-1、20μg·L-1、25μg·L-1时,臭氧—活性炭工艺的PAEs综合去除率为55.19%~66.12%,小分子的DMP、DEP检出浓度均低于3μg·L-1,处理效果优于大分子量的DBP、DEHP.活性炭—超滤工艺对大分子PAEs的吸附截留作用明显,各PAEs物质的检出浓度介于0~3.11μg·L-1.对比2种联用工艺可知,在低中高3种PAEs进水浓度下,活性炭—超滤工艺的PAEs综合去除率及末端PAEs出水浓度均优于臭氧—活性炭工艺的处理效果,超滤作为第三代净水工艺有着良好的技术优势.     

中空纤维支载离子液体液液微萃取测定环境水样中的4-n-壬基酚

建立了中空纤维支载离子液体液液微萃取方法,结合HPLC/UV用于测定环境水体中痕量4-n-壬基酚.以l-辛基-3-甲基咪唑六氟磷酸离子液体([C8MIM][PF6])为萃取剂,优化影响萃取效率的萃取剂体积、供体相pH值、离子强度和萃取时间.最佳条件下,即[C8MIM][PF6]为5.0μL,pH=5,盐质量分数5%,萃取时间8 h时,对水体中4-n-壬基酚的富集倍数可达1 129倍,检出限质量浓度为0.05μg·L-1(S/N=3),质量浓度线性范围0.15~100.00μg·L-1(R=0.999 7),地表水加标回收率为80.1%~105.6%.     

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.     

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.     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

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。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.     

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.