多种食醋酸度与微量元素分析

现代医学研究证明,食醋有益但喝醋未必有利健康。因此,研究食醋酸度和微量元素,探究人体健康与它们的关系是非常有意义的。实验在常温下用p H计测定多种食醋的酸度,然后在常压微沸(90℃~95℃)条件下采用V(硝酸)∶V(高氯酸)=4∶1消化食醋,应用火焰原子吸收光谱法和石墨炉法测定不同食醋中金属元素的含量,其中用火焰原子吸收光谱法测定了K、Ca、Na、Mg、Mn、Zn、Fe、Cu的含量,用石墨炉法分析研究了食醋中Pb、Cd的含量。研究了测定不同元素时仪器的最佳工作条件、并作了方法精密度的考察,相对标准偏差(n=9)在0.24%~6.19%。结果表明食醋中K、Ca、Na、Mg的含量较高,Mn,Fe、Zn、Cu、Pb的含量较低,Cd的含量未检测出。     

顶空气相法测定醋中的甲醇和乙醇含量

建立一种用于食醋中可能残留的甲醇和乙醇的顶空气相色谱检测方法,并讨论了各种条件对测定的影响.方法采用氢火焰检测器检测,甲醇和乙醇能够完全分离,线性良好,方法检测限分别为8.91mg/L和7.28mg/L,6次测定的相对标准偏差分别为5.31%和3.01%,样品的加标回收率分别为96.9%～94.2%.测定了6种样品中的甲醇和乙醇含量,方法简便、快速、重现性好,基本上能满足食醋中甲醇和乙醇含量的分析.     

食醋中砷含量快速测定方法的研究

研究了一种快速、准确测定食醋中砷含量的方法,即采用常压微波消解样品,使用氢化物－原子吸收法测定食醋中砷含量的方法。方法的加标回收率为93．5％－105％,相对标准偏差为0．6％－0．9％,检出限为0．035mg/L。     

用神经网络-方波溶出伏安法同时检测微量元素

在（pH=1．5）硝酸钾-硝酸溶液中,采用方波溶出伏安法对铜、铅、镉和锌四种金属离子的混合溶液进行信号采集,并用人工神经网络处理方波溶出伏安信号,建立了性能良好的四种金属离子同时测定的神经网络测试模型。用该模型同时对食醋中铜、铅、镉、锌的含量进行了测定,结果表明：人工神经网络能够较好地解决金属离子之间的相互作用和伏安信号干扰问题,食醋样品中此四种金属离子含量的测量结果令人满意。因此,此方法必将在食品分析中有着广阔的应用前景。     

莫尔法测定酱油和食醋中的氯化钠含量

目的:测定酱油和食醋中的氯化钠含量,提醒人们烹饪时不要忽略酱油和食醋中的盐分。方法:用莫尔法测定酱油和食醋中的氯化钠含量。结果:结果表明,老抽中氯化钠含量为21.13 g/100m L,普通生抽为18.79 g/100m L,低盐生抽为13.96 g/100m L,食醋为1.281g/100m L。结论:酱油和食醋中均含有一定量的氯化钠,酱油中含量较高;老抽的含盐量比普通生抽更高;低盐生抽与普通生抽相比,减盐25%左右。     

聚类分析在酱油和食醋质量研究中的应用

通过测定酱油中的总酸、还原糖、总氮、氨基氮、氯化钠、无盐固形物和总固形物,食醋中的总酸、总酯、总糖、还原糖、总氮、氨基氮和固形物的含量,再分别以此数据对酱油和食醋进行聚类分析,得出质量相近的物质聚为一类,为研究各种食品质量提供了一种新途径。     

食醋中乙醇含量的测定

文章采用顶空气相色谱法,对多种市售食醋中的乙醇进行了定量分析。方法是在保留时间定性的基础上,用单点校正法进行定量。结果显示,在所测定的食醋样品中乙醇的含量一般在1.19mg/mL~3.37mg/mL之间,实验的相对标准偏差为1.4%~9.7%,回收率为91.0%~104.9%。为研究各种食醋的香气成分提供了简便、可靠的检测方法。     

ICP-AES法测定中药材宣木瓜中21种元素

建立电感耦合等离子体原子发射光谱法(ICP-AES)测定中药材宣木瓜中21种元素含量的方法.采用微波消解处理样品,并考察了不同元素间相互干扰,采用ICP-AES同时测定21种元素.对所测定元素的相对标准偏差(RSD)均小于4%,回收率在98%~102%之间,结果可信度高.该研究所建立的方法具有简便、快速、准确、灵敏度高的优点,可用于质量控制,并为中药材宣木瓜中21种元素含量测定提供了方法,为进一步开发和利用宣木瓜提供了科学依据.     

微量蒸馏实验教学装置的研制

针对在实践教学中采用传统蒸馏法测定液体样品乙醇含量存在取样量大的缺点,研发了一种微量蒸馏装置,并应用于微量液体样品中乙醇含量的测定。该装置结构简单,使用方便,并在实践教学中用于监测啤酒或食醋发酵过程乙醇含量的变化情况,取得了良好的实践教学效果。     

顺序扫描ICP—AES法测定高纯石墨灰分中14种杂质金属元素的方法研究

本文研究了快速测定石墨灰分中14种杂质元素Al，Ca，Cd，Co，Cr，Cu，Fe，Mg，Mn，Mo，Ni，Ti，V，Zn的分析方法，以满足提纯石墨研究工作对快速了解石墨提纯效果的要求。依据测定样品中各元素的含量情况，实验选择14种元素的分析线。运用ICP—AES谱线轮廓图功能，消除常量元素产生的基体背景干扰。运用干扰系数法进行测定结果校正，并对ICP—AES测定灰分中14种元素的检出线、精密度、准确度进行了测定。结果显示，本方法分析石墨灰分中杂质元素能够满足提纯石墨研究工作的要求。     

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.     

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.     

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.     

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.