工业用间二甲苯氨氧化催化剂的表面吸附特征研究

用低温N2吸附及H2O，C6H6和m-C6H4(CH3)2等探针分子静态吸附以及NH3－TPD等方法考察了工业用间二甲苯氨氧化生产间苯二甲腈催化剂VCB1，VCB2和VCM表面吸附特征。结果，VCB1，VCB2和VCM催化剂均具有中孔（15－40nm）结构，反应物分子在孔道中的扩散不构成吸附过程的控制步骤，催化剂对反应组分的吸附能力取决于催化剂表面亲合力。VCM对m-C6H4(CH3)2新合力较强，其表面对H2O和NH3的亲合力弱是该催化剂在使用过程中深度氧化产物较多的可能原因之一，结果为催化剂改性提供了理论依据。     

CO_2在LTA型和FAU型沸石分子筛中吸附的力场研究

采用巨正则系综的蒙特卡罗法,利用几种通用力场对LTA型4A分子筛吸附CO_2进行模拟研究,基于Dreiding力场分析力场参数σ和ε对模拟结果的影响,得到适用于4A分子筛吸附CO_2的准确Dreiding力场参数。将该力场参数应用到LTA型5A分子筛吸附模拟中,得到5A分子筛吸附模拟的力场参数。最后将4A分子筛吸附CO_2的力场参数应用到FAU型13X分子筛的吸附模拟中。结果表明:模拟结果与实验数据吻合较好,分子筛阳离子的改变对吸附力场影响较大,而分子筛结构对力场的影响相对较小。与13X具有同种阳离子的4A分子筛力场参数可直接作为13X分子筛的力场,具有通用性。     

H-ZSM-5分子筛Brфnsted酸性位吸附NO_x的DFT研究

基于量子化学的密度泛函理论(DFT),研究了NOx(NO,N2O)分子在H-ZSM-5分子筛Brфnsted酸性位的吸附。计算采用7T簇模型和B3LYP/6-31G(d,p)方法,得到了H-ZSM-5分子筛孔道中不同B酸位的吸附能和红外光谱。结果表明,NO和N2O分子分别以η1-N模式和η1-O模式吸附于H-ZSM-5分子筛的B酸位。处于分子筛孔道中的B酸吸附NO和N2O的能力不同,H-ZSM-5分子筛直孔道处α位酸吸附能力最强,正弦孔道β位酸次之,吸附能力最弱的是孔道交叉处的γ位酸。     

C6异构烷烃对正己烷在成型5A分子筛上高温吸附性能的影响

在147～245℃下采用智能重量分析仪,测定C6烷烃(正己烷、3-甲基戊烷(3MP)、2-甲基戊烷(2MP)和甲基环戊烷(MCP))在成型无黏结剂5A分子筛(简称成型5A分子筛)上的吸附等温线;不同C6异构烷烃存在时,在动态吸附实验装置上测定正己烷在成型5A分子筛上的吸附穿透曲线,考察C6异构烷烃对正己烷在成型5A分子筛上动态吸附性能的影响。结果表明:在193～195℃、C6异构烷烃分压为10.80 kPa下,每100 g成型5A分子筛对3MP、MCP和2MP的平衡吸附量分别为1.35、1.31和0.35 g;3MP的存在可导致正己烷在成型5A分子筛上的穿透吸附量下降约6.0%;MCP吸附于成型5A分子筛晶间孔(大孔)中,对正己烷在成型5A分子筛微孔上的动态吸附性能几乎没有影响。用变压吸附(PSA)抽提C6馏分中正己烷的过程,宜在不小于200℃下进行,应主要考虑3MP和MCP对正己烷纯度和回收率的影响。     

Toader型平均的调和、几何、形心和反调和平均界

通过研究Toader型平均T(A,G)与调和平均H(或几何平均G)和形心平均E(或反调和平均C)凸组合的序关系,发现了最佳参数α_1,α_2,α_3,α_4,β_1,β_2,β_3,β_4∈(0,1),使得双向不等式α_1E(a,b)+(1-α_1)G(a,b)T[A(a,b),G(a,b)]β_1E(a,b)+(1-β_1)G(a,b),α_2E(a,b)+(1-α_2)H(a,b)T[A(a,b),G(a,b)]β_2E(a,b)+(1-β_2)H(a,b),α_3C(a,b)+(1-α_3)G(a,b)T[A(a,b),G(a,b)]β_3C(a,b)+(1-β_3)G(a,b),α_4C(a,b)+(1-α_4)H(a,b)T[A(a,b),G(a,b)]β_4C(a,b)+(1-β_4)H(a,b)对所有a,b0且a≠b成立.作为应用,得到一个新的第二类完全椭圆积分的确界.     

三维超分子体系[Cd(C_6H_4O_2N)_2(H_2O)_4]的合成与晶体结构

合成并测定了一种新的三维超分子体系——[Cd(C6H4O2N)2(H2O)4]的晶体结构.该晶体属于三斜晶系,Pī空间群,a=6.4461(13),b=6.9332(14),c=9.4411(19)魡,α=94.75(3)°,β=104.70(3)°,γ=112.08(3)°,V=370.63(13)魡3,μ=1.518mm-1,Z=1,M=428.67,Dc=1.921g/cm3,F(000)=214,λ(MOKα)=0.71073魡,最终偏离因子R1=0.0405,ωR2=0.1236.该超分子体系的基本结构单元[Cd(C6H4O2N)2(H2O)4]中,Cd处于八面体的中心;各个结构单元之间通过氢键相互连接,形成无限伸展、层状结构的三维超分子体系.     

烷烃在金属有机骨架MOF-5和Cu-BTC中吸附的蒙特卡罗模拟

采用蒙特卡罗方法(Monte Carlo,MC)研究烷烃在2种典型的金属有机骨架MOF-5和Cu-BTC(BTC,均苯三甲酸)中的吸附.模拟298K下烷烃(CH4、C2H6、C3H8、正丁烷、正戊烷)在MOF-5和Cu-BTC中单组分吸附等温线,结果表明:随着压力的增加,烷烃的吸附量变大.在低压部分,吸附量由小到大的顺序是:CH4、C2H6、C3H8、正丁烷、正戊烷;而在高压部分,吸附量由小到大的顺序是:正戊烷、正丁烷、C3H8、C2H6、CH4.分析烷烃在MOF-5和Cu-BTC中的位置分布,得到烷烃在MOF-5和Cu-BTC中填充顺序:在MOF-5中,烷烃首先吸附在金属氧化物团簇Zn4O周围,然后进入孔道中间;在Cu-BTC中,烷烃首先吸附在四面体型的边孔道中,然后进入主孔道中.     

分子筛催化剂的研究

Ⅰ.加压一次交换制稀土-Y型分子筛 目前国内外生产用于石油裂解催化剂的稀土-Y型分子筛,一般是采用二交二焙工艺。 H.S.Sherry的八面沸石型分子筛La~(3+)—Na~+交换等温线工作表明,交换分两步:快的一步是La~(3+)水合离子交换大腔中的Na~+;慢的一步是交换β笼中的Na~+。慢的原因是La~(3+)水合离子(直径7.92)要通过β笼窗口(直径2.6)进入β笼需脱水(脱     

O2对C2H4/C2H6体系中C2H4的吸附性能影响

环氧乙烷生产过程中排放的尾气含有C2H4、C2H6和O2等组分，若采用变压吸附法回收其中的C2H4时，需要考虑O2对吸附分离C2H4的影响。在固定床吸附柱上，测定了有0。存在时，C2H4／C2H6体系在3种吸附剂（活性炭、NJ络合吸附剂和NK络舍吸附荆）上的动态吸附行为，考察了O2对不同吸附剂吸附C2H4的选择性和稳定吸附容量的影响。结果表明：在有02的实验条件下，NK络合吸附荆对C2H4／C2H6体系能优先吸附C2H4，且C2H4的吸附性能不受O2的影响，C2H4／C2H6的分离系数为10；NK络合吸附刑具有稳定的有效c2H。吸附量9．2mL／g。实验结果为工业回收C2H4提供了基础。     

超分子化合物[HN(C_2H_5)_3]_2H[PW_(12)O_(40)]·4H_2O的水热合成、晶体结构及电化学性质

利用中温水热技术合成了新型超分子化合物[HN(C2H5)3]2H[PWl2O40]·4H2O,并采用元素分析、红外光谱、单晶X-射线衍射对其进行了表征.晶体学参数:三斜晶系,C2/C空间群,a=2.468 9(5)nm,b=1.083 1(5)nm,c=2.248 2(5)nm,α=90.00°,β=121.094(5)°,γ=90.00°,V=5.148(3)nm3,Z=4,R1=0.045 6,wR2=0.147 1.该化合物的基本结构单元是由2个质子化的三乙胺分子、4个水分子、1个质子和1个Keggin型杂多阴离子[PWl2O40]3-组成.不同结构单元之间通过氢键作用形成一维链状结构,链间进一步通过分子间氢键构成三维超分子结构.     

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.