羟胺-乙二胺-钴(Ⅱ)显色体系与甲醛质量浓度测定的研究

采用正交试验法研究了羟胺-乙二胺-钴(Ⅱ)的显色体系与甲醛反应的最佳条件．最 佳条件为5．00×10-2 mol／L羟胺溶液2．00 mL,1．00×10-1 mol／L乙二胺溶液3．0 mL,2．00×10-1 moL／L钴(Ⅱ)溶液5．00 mL,0．200 mol／L硫酸溶液0．80 mL,加热温度为55℃,加热时间为6 min．甲 醛质量浓度在0．080-3．200μg／mL范围内线性关系良好,检测下限为0．061 0 μg／mL,线性相关系数 为0．998 7．该法可用于饮用水加标回收率实验及脲醛树脂中的游离甲醛质量浓度检测．     

利用粉煤灰与沸石处理含铜废水的研究

利用粉煤灰与沸石对含铜废水进行了吸附实验研究，探讨了吸附剂用量、接触时间、Cu^2 质量浓度对去除率的影响．结果表明，粉煤灰与沸石对Cu^2 都有较高的吸附能力，可作为吸附废水中Cu^2 的吸附剂．在13C、pH=5、Cu^2 质量浓度为300mg／L的条件下，沸石对Cu^2 的最高去除率用量为4．0g／150mL，最佳接触时间为20min；粉煤灰对Cu^2 的最高去除率用量为16．0g／150mL，最佳接触时间为60min．     

黄原胶流变学性质的实验研究

研究了不同浓度黄原胶水溶液的流变学特性,回归了稠度系数K和流变参数n与黄原胶浓度Cp的关系,结果表明：溶液浓度较低时,黄原胶水溶液为牛顿性流体;随着浓度的增加,逐渐转变为假塑性流体．可以分别描述为黄原胶浓度Cp的函数：当0〈Cp≤30g／L时,K=1．128Cp^1.572．当0〈Cp≤8g／L时,n=0．485-0．16lnCp;当8g／L〈Cp≤30g／L时,n=0．075＋0．041lnCp．     

铀矿石成分对铀的细菌浸出影响研究

对几种含不同成分的铀矿石进行了铀的氧化亚铁硫杆菌柱浸实验和耐性实验研究．柱浸实验结果表明，与硫酸浸出相比，细菌浸出可降低酸耗5％-20％．耐性实验结果表明，氧化亚铁硫杆菌经过驯化培养，能在铀质量浓度近2．0g／L的环境中生存并可氧化Fe^2＋，耐F^-可从驯化培养前质量浓度0．28g／L提高到0．83g／L．     

添加剂促进变性还原溶菌酶复性的作用

研究了多种添加剂促进变性还原溶菌酶复性的作用，考察了添加剂浓度及变性剂盐酸胍浓度对复性收率的影响．结果表明，精氨酸、乙酰胺、丙酮、硫脲及甘油均能有效促进变性溶菌酶复性，并且存在最佳的添加剂浓度使变性溶菌酶的复性收率最大．在促进复性中，乙酰胺等结构类似物与盐酸胍具有相同作用，因此，在降低复性液中盐酸胍浓度的同时，适当提高乙酰胺浓度即可获得较高的复性收率．当盐酸胍浓度为0．2mol／L时，复性收率达到90％时的乙酰胺浓度为2mol／L，但降低盐酸胍浓度至0．06mol／L时，达到相同变性收率的乙酰胺浓度需要4mol／L．甘油与盐酸胍存在着协同作用，在一定浓度的盐酸胍存在下，添加适量的甘油能获得较高的复性收率．     

NBS-荧光素化学发光体系测定头孢吡肟和头孢克肟

在碱性条件下,头孢吡肟和头孢克肟能被NBS（N-溴代琥珀酰亚胺）氧化,其能量可激发共存的荧光素而产生化学发光,发光强度与头孢吡肟和头孢克肟的浓度在一定范围内呈良好的线性关系,基于此,结合流动注射技术,建立了一种直接测定头孢吡肟和头孢克肟的化学发光新方法．该方法灵敏度高,重现性好．对头孢吡肟的检出限为5．7g／L（IUPAC）,线性范围为0．01-10mg／L,RSD为2．5％（5．0mg／L,n=11）。对头孢克肟的检出限为0．048mg／L（IUPAC）,线性范围为0．08-5．0mg／L,RSD为2．9％（0．5mg／L,n=11）。该方法已成功用于盐酸头孢吡肟粉针和头孢克肟胶囊含量的测定、     

基因工程菌Pichia pastoris连续培养的生长及抑制动力学

在同一稀释率μ（μ＝0．14h^-1）下用不同浓度的甘油流加进行连续培养,研究甘油浓度对基因工程菌毕赤酵母（Pichia pastori）生长的影响。结果表明甘油浓度对细胞生物量（DCW和WCW）、底物得率系数（Yx/s）、底物比消耗速率（qs）、呼吸熵（RQ）与二氧化碳释放率（CER）都有影响,在低甘油残留浓度（＜63．3g／L）下,甘油是激活剂,菌体生长符合Monod方程,Ks＝19．62g／L,甘油激活常数Ka＝19．45g／L;而在高甘油残留浓度（＞63．3g/L）下甘油是抑制剂,菌体生长特征符合Haldance方程,Ks＝0．014g／L,K1=156．67g／L。毕赤酵母生长的甘油抑制浓度为55．2g／L。     

硅对盐胁迫下杨树叶片细胞超微结构的影响

研究了杨树在不同程度盐胁迫下加硅处理30d后,叶片细胞超微结构的变化。结果表明,无硅条件下,随着盐胁迫浓度的增加和时间的延长,杨树叶肉细胞内叶绿体类囊体扭曲、变形、松散,嗜锇颗粒增多,外膜逐渐断裂解体,局部消失,细胞核固缩,核物质凝聚,核膜不清晰。盐质量浓度为40g／L比盐质量浓度为20g／L和30g／L的处理对叶片细胞结构的损伤程度更为严重。盐胁迫下加硅后杨树叶肉细胞细胞器损伤得到明显改善,表现为叶绿体类囊体排列有序,嗜锇颗粒略有增多,细胞核基本完好,局部核物质凝聚。施硅质量浓度为05g／L比施10g／L的效果显著,且对盐质量浓度为20g／L和30g／L的缓解效果比质量浓度为40g／L的更为明显。     

固定化啤酒酵母废菌体吸附Pt4+特性的研究

用2％海藻酸钠与l％明胶混合为包埋剂固定啤酒酵母废菌体．固定化啤酒酵母废菌体(ISCWB)呈球形．粒径2～3mm．ISCWB吸附作用受吸附时间、溶液pH值、ISCWB浓度和Pt^4 起始浓度等的影响．但不受温度的影响；吸附作用是一个快速的过程．吸附60min达到平衡．但在最初的5min内吸附量可达最大吸附量的88．4％．吸附Pt^4 的最适pH为2．0．在Pt^4 起始浓度200mg／L、固定化菌体浓度1．6g／L、pH2．0和30℃条件下振荡吸附60min．吸附量为44．0mg／g．TEM观察显示，固定化菌体不仅能吸附Pt^4 而且能将Pt^4 还原成Pt^0．从含Pt^4 95．22mg／L和47．6lmg／L的废铂催化剂处理液中回收铂．其吸附率分别为48．44％和60．72％，吸附量为26．97mg／g和17．2lmg／g．以1．0mol／L盐酸作为解吸剂，解吸率达80．2％．在填充床反应器中．固定化菌体的最大饱和吸附量为21.0mg／g．解吸率为80％．该固定化菌体有较好的应用前景．     

O—FPF—CTMAB荧光光度法测定水中微量钼的研究

研究了荧光光度法测定微量钼的新方法．在0．04～0．24mol.L^-1的盐酸介质中,邻氟苯基荧光酮(O-FPF),溴化十六烷基三甲铵(CTMAB)和钼M0(Ⅵ)形成无荧光的三元配合物,从而导致体系的荧光熄灭,在激发波长λcm=365nm和发射波长λcm=529nm时,钼含量在0-3．0μg／25mL范围内,荧光熄灭值△F和钼浓度成正比．方法灵敏度高,检出限为2．0μg／L．用于水样中微量钼的测定,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-