高效液相色谱法分析20.0%卞·乙稻田除草剂

研究了反相高效液相色谱法定量分析20.0%卞黄隆和乙草胺二元混配稻田除草剂有效成分的方法。色谱条件:迪马C18柱(250×4.6mm,5μm,),流动相为甲醇/水(90∶10,V/V),λ=230nm,流速:1mL/min;线性相关系数为0.9999,外标法定量。卞黄隆和乙草胺的平均回收率分别为99.29%,100.24%(RSD<0.75%)。结果表明该法简便、快速、精密、准确,可以为20.0%卞.乙稻田除草剂质量标准的制定提供科学依据。     

基于苯并三噻吩共聚物/富勒烯衍生物的聚合物太阳能电池

以苯并三噻吩共聚物(BTT-BTz)为给体材料,具有不同能级结构的富勒烯衍生物为受体材料,通过共混方式制备光敏薄膜,并研究受体材料的能级结构对光伏器件开路电压(Voc)、短路电流(Jsc)、填充因子(FF)和电池效率(PCE)的影响.结果表明:当IC60BA为电子受体材料时,器件的Voc=1.06V,但Jsc较低,使得PCE仅为1.49%;当PC60BM和PC70BM为受体材料时,Voc分别为0.86V和0.81V,但Jsc较高,使得PCE分别为3.22%和5.06%.     

HPLC法测定乌头须根中准格尔乌头胺和宋果灵的质量比

采用高效液相色谱法测定乌头须根中准格尔乌头胺和宋果灵两种生物碱类化合物的质量比.用Zorbax Extend-C18(4.6 mm×250 mm ODS,5μm)色谱柱,以V(甲醇)∶V(w(三乙胺)=0.1%)=6∶4为流动相,流速为1.0 mL/min,检测波长220nm,柱温25℃.结果表明:在选择的色谱条件下,两种生物碱类成分可实现基线分离,且线性范围宽(0.1~10.0μg),r2=0.999 8;平均加样回收率分别为99.8%和99.3%,相对标准偏差(RSD)分别为1.49%,1.46%(n=6),质量比分别为57.0,110.0μg/g.     

[C5H5NH]3[PMo12O40]·4.5H2O的合成与表征

以12-钼磷酸和吡啶为原料合成了一种电荷转移盐. 通过C,N,Mo和P元素分析和热重分析确定其组成为[C5H5NH]3[PMo12O40]·4.5H2O,各元素的质量分数分别为(括号内为理论值)C 8.82 %(8.42%),N 1.69%(1.96%),P 1.40%(1.45%)和Mo 52.98%(53.78%);采用红外光谱、紫外-可见漫反射光谱、 X射线粉末衍射和循环伏安法等分析手段对该化合物进行了表征. 结果表明所合成的新型电荷转移化合物的杂多阴离子保持Keggin结构特征;相对于H3PMo12O40·xH2O,[C5H5NH]3[PMo12O40]·4.5H2O中由于离域π键的存在,对紫外-可见光的吸收从紫外区拓展到可见光区,并且在波长为370 nm处出现新的吸收峰;其还原电位为0.21 V,较H3PMo12O40·xH2O的还原电位(0.32 V)低,故其还原能力增强.     

反相高效液相色谱法测定茶叶中氯氰菊酯和氰戊菊酯农药残留

采用V(正己烷)∶V(丙酮)=97.5∶2.5混合溶剂提取茶叶样品中的氯氰菊酯和氰戊菊酯农药残留,选用氟罗里硅土/活性炭混合柱为色谱柱和V(石油醚)/V(乙酸乙酯)=9∶1为淋洗液的方法净化待测样品.在优化的流动相配比(V(乙腈)∶V(水)=74∶26)及流速(1.2mL·min-1)条件下,用配备HypersilODS柱、二极管阵列检测器的高效液相色谱仪进行了待测组分的分离和测定.实验证明茶叶样品中氯氰菊酯和氰戊菊酯添加标准的回收率分别为71.0%和76 0%,加标回收的相对标准偏差(RSD%,n=6)分别为2.5%和2.2%.本方法具有溶剂使用量少、净化效果好、操作简便、快速等特点,可用于茶叶中氯氰菊酯和氰戊菊酯的农药残留分析.     

反相高效液相色谱法测定PELA微粒中胰岛素含量

为测定PELA微粒中胰岛素含量,建立反相高效液相色谱方法. 以Zorbax300SB-C18高效液相色谱柱分离;检测波长为220 nm;流动相组成为:V(H2O(含φ(TFA)＝0.15%))∶V(CH3CN)＝66∶34;保留时间为4.3 min. 结果在ρ(胰岛素)为10～200 μg/mL范围内,峰面积(A)与胰岛素质量浓度(ρ)成线性变化,其线性方程为:ρ=7.82×10-2A +9.88×10-2,相关系数r=0.999 95. 日内差和日间差分别为0.6%和0.7%. 当ρ(胰岛素)为60, 80和100 μg/mL时的回收率分别为(98.1±0.5)%, (99.6±1.5)%和(99.4±1.0)%(n＝6). 测得胰岛素在PELA微粒中的包封率为(56.3±3.3)%(n＝6).     

高效液相色谱-质谱法测定亚贡叶中亚贡二萜酸A和C的含量

建立了同时测定亚贡(Smallanthus sonchifolius)叶中亚贡二萜酸A和C含量的方法.采用高效液相色谱-质谱法,多反应监测(MRM)模式,大黄素为内标,色谱柱:UltimateTM XB-C18(150mm×4.6mm,5μm);流动相:V(甲醇)∶V(0.5%醋酸水溶液)=90∶10;流速:1.0mL/min;柱温:25℃.亚贡二萜酸A和C的线性范围均为0.2～10.0μg/mL(r≥0.999),平均加样回收率(n=6)分别为96.6%和92.4%,相对标准偏差(RSD)分别为1.9%和3.2%.实验数据表明,该方法操作简单、准确,且重复性好,可用于亚贡叶的质量控制.     

TiO2-x(V2O5)纳米复合薄膜的光吸收

采用溶胶 -凝胶技术 ,以Ti(C4H9O) 4 和V2 O5粉末为原材料制备了纳米结构的TiO2 -x(V2 O5) (x为V2 O5的质量分数 ,分别为 10 % ,2 0 % ,30 % ,10 0 % )复合薄膜 .采用原子力显微镜观察薄膜的表面形貌 ;使用UV VIS NIR分光光度计测量了复合薄膜在紫外 -可见光波段的透射率和反射率光谱 ,研究其光吸收特性 .实验结果表明 :复合薄膜具有纳米颗粒结构 ;随着V2 O5用量的增加 ,复合薄膜在紫外光区的吸收逐渐增加 ,(αhv) 1/ 2 与hv存在线性关系 ,光学带隙由纯TiO2 的 3.36eV减小为x =30 %时的 2 .83eV ,光学带隙与x满足Eg(x) =Eg(0 ) [Eg(1)-Eg(0 ) -b]x bx2 关系式 ;复合薄膜光吸收边缘红移起因于V2 O5复合后薄膜中定域态宽度的增加 .     

高效液相色谱法同时测定阿-甲微乳剂中的阿维菌素和甲氨基阿维菌素苯甲酸盐

采用反相高效液相色谱法,以C18为色谱柱,用甲醇 体积分数为0.1%的三乙胺水溶液(V甲醇∶V三乙胺=90∶10)作为流动相,在250 nm波长下,同时测定阿-甲微乳剂中的阿维菌素和甲氨基阿维菌素苯甲酸盐(简称甲维盐)的质量含量.结果表明:阿维菌素和甲维盐的线性关系分别为0.024 0~0.240 0 g.L-1和0.040 0~0.400 0 g.L-1,回收率分别为95.47%~102.00%和95.68%~101.34%,相对标准偏差分别为0.68%~1.25%和0.43%~1.06%,该法达到了简便、快速、准确的目的.     

二茂铁-肽Boc-HN-Fca-Gly-Gly-Tyr-Arg-OMe的合成和电化学性质

以二茂铁二甲酸、甘氨酸、酪氨酸和精氨酸为原料,通过多步反应,合成新的二茂铁-肽衍生物Boc-HN-Fca-Gly-Gly-Tyr-Arg-OMe(7)(Fca代表二茂铁氨基酸)和Boc-HN-Fca-Gly-Gly-Tyr-Arg-OH(8),对寡聚肽的合成进行研究;对合成产物进行红外光谱和氢核磁共振谱表征,并运用循环伏安(CV)方法对产物的电化学性能进行研究。研究结果表明:产物(7)和(8)的产率分别为83.5%和80.2%;Boc-HN-Fca-Gly-Gly-Tyr-Arg-OMe的循环伏安扫描结果是氧化峰和还原峰电位分别为0.385V和0.346V,峰电位之差ΔEp为41 mV,峰电流密度之比Jpa/Jpc为1.055;对于Boc-HN-Fca-Gly-Gly-Tyr-Arg-OH,其氧化峰和还原峰电位分别为0.532V和0.453V,峰电位之差ΔEp为79mV,峰电流密度之比Jpa/Jpc为0.928。     

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.     

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.     

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.