[Z]－1－[三苯基锡基]－3－苯基－1－丁烯－3－醇的合成与谱学表征

本文合成了一种新的有机锡化合物，通过熔点测定、红外光谱、核磁共振谱、元素分析、锡含量测定等手段对其结构进行了表征。     

螺双杯[4]芳烃-冠-3醚在溶液中构象的研究

研究了螺双杯[4]芳烃-冠-3醚在溶液状态下的¹H、¹³C、¹H-¹³C HMQC、¹H-¹³C HMBC、¹H-¹H TOCSY等核磁共振谱,对其¹H、¹³C谱进行了归属,确定了室温该化合物在溶液状态下的稳定构象为锥式,并利用2D NOESY近似求出杯芳烃区的各种氢的距离,以此为约束进行了模拟淬火计算,证实了2D NOESY谱中多种羟基存在方式,并利用二维交换矩阵计算得出几种羟基的交换速率及其与溶剂中痕量水的交换速率.     

2-[-4-取代苯基-2-氧-3-酰氨基-1-吖丁啶基]-2-苯基乙酸类化合物的80兆1HNMR谱

本文报告二十个题目化合物的80兆¹H NMR谱。这些新合成的化合物均未见诸文献。利用偶合常数鉴定了β-内酰胺环的立体构型,并对图谱进行了解析,证明所合成的化合物均为顺式构型的β-内酰胺单环衍生物,同时讨论了溶剂和取代基对化学位移的影响。     

1-(6-羟基-2-嘌呤基)-3-[4-(苯基偶氮)苯基]- 三氮烯分光光度法测定微量镍

在pH=10.97的NaB4O7-NaOH缓冲溶液中,表面活性剂Tween-80存在下,1-(6-羟基-2-嘌呤基)-3-[4-(苯基偶氮)苯基]-三氮烯(HPAPT)与镍的显色反应,形成一种稳定的1∶2红色配合物,其最大吸收波长位于540nm,表观摩尔吸光系数ε540＝2.06×105L·mol-1·cm-1,Ni(Ⅱ)在0-15μg/25mL范围内符合比耳定律.结合萃取分离,应用于人发、大米和油菜中镍的测定,结果令人满意.     

1,1-二甲硫基-[1]-烯基丙二酸二甲酯与苯相互作用的1H NMR研究

本文在四氯化碳介质中考察了苯对1,1-二甲硫基-[1]-烯基丙二酸二甲酯的溶剂效应,观察到标题化合物分子内的甲基和溶剂苯的化学位移随着苯的摩尔分数增加而逐渐移向高场,溶剂苯的共振吸收峰是一个尖锐的单峰,同时发现了标题化合物分子中甲基和溶剂苯的化学位移值与混合溶剂苯的摩尔分数呈线性关系.     

电荷转移配合物[Himi]4[Mo8O26]·16H2O的合成与表征

本文以钼酸钠和咪唑(C_3H_4N_2,imi)为原料,合成了组成为[Himi]_4[Mo_8O_(26)]·16H_2O的电荷转移配合物。通过元素分析、红外光谱、紫外光谱、热重-差热分析对其进行了初步表征。红外光谱表明,固态配合物的阴、阳离子间存在电荷转移作用;紫外光谱显示,稀水溶液中配合物完全解离,彼此无相互作用。     

2-(2-苯并噁唑啉酮-3-甲基)-6-芳基-咪唑[2,1-b][1,3,4]噻二唑的NMR谱研究

许多文献已报道,含有咪唑[2,1-b][1,3,4]噻唑环的衍生物具有抗癌、抗结核、抗菌、抗真菌、抗惊厥、止痛等活性. 该文合成了一个新的在医药方面具有潜在应用价值的咪唑[2,1-b][1,3,4]噻二唑衍生物,即2-(2-苯噁唑啉酮-3-甲基)-6-苯基-咪唑[2,1-b][1,3,4]噻二唑,并利用2D NMR技术对其¹H NMR 和¹³C NMR谱进行了全归属.      

1,1-二甲硫基—[1]—烯基丙二酸二甲酯与苯相互作用的~1H NMR研究

本文在四氯化碳介质中考察了苯对1,1-二甲硫基-[1]-烯基丙二酸二甲酯的溶剂效应,观察到标题化合物分子内的甲基和溶剂苯的化学位移随着苯的摩尔分数增加而逐渐移向高场,溶剂苯的共振吸收峰是一个尖锐的单峰,同时发现了标题化合物分子中甲基和溶剂苯的化学位移值与混合溶剂苯的摩尔分数呈线性关系.     

N-2-萘并[1,2-d]噻唑基苯甲酰胺的合成与结构表征

1-苯甲酰基-3-萘基硫脲在醋酸锰作用下,自身发生关环反应成功获得目标产物N-2-萘并[1,2-d]噻唑基苯甲酰胺,其结构经红外光谱、氢谱和碳谱得到了确证.     

新试剂1-(2-羟基苯基)-3-[4-(苯基偶氮)苯基]-三氮烯的合成及与溴化十六烷基三甲铵的显色反应

合成了新试剂１－（２－羟基苯基）－３－［４－（苯基偶氮）苯基］－三氮烯（ＨＰＡＰＴ）,在氢氧化钠碱性介质中,该试剂与溴化十六烷基三甲铵（ＣＴＭＡＢ）形成１∶３的紫红色离子缔合物。λｍａｘ位于５６５ｎｍ,表观摩尔吸光系数为１．５９×１０４Ｌ·ｍｏｌ－１·ｃｍ－１,ＣＴＭＡＢ含量在３—２９．１６ｍｇ·Ｌ－１范围内符合比耳定律。测定了显色体系ＣＴＭＡＢ的临界胶束浓度是１．５０×１０－４ｍｏｌ·Ｌ－１。     

Unification of 3-3-1 models

A 3-3-1 model is constructed for three families that can be embedded into a single SU(8) unified model. Assuming appropriate branching rules and symmetry-breaking pattern, a complete fermion content is found within irreducible representations of SU(8), where light Standard Model fermions, heavy 3-3-1 fermions and superheavy fermions may be distinguished.     

A Quantum Monte Carlo Study on Mixed-Spin Chains of 1/2-1/2-1-1 and 3/2-3/2 -1-1

The ground-state and thermodynamic properties of quantum mixed-spin chains of1/2-1/2-1-1and 3/2-3/2-1-1are investigated by a quantum Monte Carlo simulation with the loop-cluster algorithm. For 1/2-1/2-1-1 chain, we find it has two phases separated by an energy-gap vanishing point in the ground-state. For 3/2-3/2-1-1 chain, the numerical results show two energy-gap vanishing points isolated by different phases in its ground-state. Our calculations indicate that all these ground state phases can be understood by means of valence-bond-solid picture, and the thermodynamic behavior at finite temperatures is continuous as a function of parameterα=J2/J1.     

A Quantum Monte Carlo Study on Mixed-Spin Chains of 1／2-1／2-1-1 and 3／2-3／2-1-1

The ground-state and thermodynamic properties of quantum mixed-spin chains of 1/2-1/2-1-1 and 3/2-3/2-1-1 are investigated by a quantum Monte Carlo simulation with the loop-cluster algorithm. For 1/2-1/2-1-1 chain, we find it hastwo phases separated by an energy-gap vanishing point in the ground-state. For 3/2-3/2-1-1 chain,the numerical results show two energy-gap vanishing points isolated by different phases in its ground-state. Our calculations indicate that all these ground state phases can be understood by means of valence-bond-solid picture, and the thermodynamic behavior at finite temperatures is continuous as a function of parameter α=J2/J1.     

1-3型压电复合材料

1－3型压电复合材料是目前研究和应用得比较广泛的一种压电材料．本文简述了这种压电复合材料的理论模型、制作方法和实验结果；指出除了圆形PZT压电材料所具有的径向模和厚度模以外，1－3型压电复合材料还具有横向结构模．本文介绍了这种压电复合材料的特点，如低声阻抗、低介电常数、高静水压压电常数以及PZT相分布的可控制性等．这些特点有利于改善压电复合材料换能器的时间响应和空间响应．     

Identification ofμ +-sites in the 1-2-3 compoundin the 1-2-3 compound

Possibleμ ⁺ sites have been identified by a comparison of measured spontaneous internal fields in YBa₂Cu₃O_6+δ and REBa₂Cu₃O_7−δ and of measured second moments and width of transverse field powder spectra with the corresponding calculated quantities. In the YBa₂Cu₃O₇ system only one possibleμ ⁺ site emerges at a distance of ∼1.05 A from a chain oxygen O(4) at the position (0.15(1), 0.44(1), 0.071(1)). In the system YBa₂Cu₃O₆ the only possibleμ ⁺ sites are near to an oxygen O(1) with z/c=0.133 and the same distance as above. The analysis leads also to improved valuesμ _Ho = 2.2(1)μ _B andμ _Cu = 0.67(4)μ _B and to a determination of the latters direction:μ _Cu ‖〈110〉.     

Concerning the Landau pole in 3-3-1 models

Some 3-3-1 models predict the existence of a non-perturbative regime at the TeV scale. We study in these models and their supersymmetric extensions, the energy at which the non-perturbative limit and a Landau-like pole arise. An order of magnitude for the mass of the extra neutral vector boson, , present in these models is also obtained.Received: 12 October 2004, Revised: 1 November 2004, Published online: 21 December 2004PACS: 12.60.Cn, 12.60.Jv     

Inflationary scenario in the supersymmetric economical 3-3-1 model

We construct the supersymmetric economical 3-3-1 model which contains inflationary scenario and avoids the monopole puzzle. Based on the spontaneous symmetry breaking pattern (with three steps), the F-term inflation is derived. The slow-roll parameters ∈ and η are calculated. By imposing as experimental five-year WMAP data on the spectral index n, we have derived a constraint on the number of e-folding N _Q to be in the range from 25 to 50. The scenario for large-scale structure formation implied by the model is a mixed scenario for inflation and cosmic string, and the contribution to the CMBR temperature anisotropy depends on the ratio M _X /M _Pl. From the COBE data, we have obtained the constraint on the M _X to be M _X ∈ [1.22 × 10¹⁶, 0.98 × 10¹⁷] GeV. The upper value M _X ≃ 10¹⁷ GeV is a result of the analysis in which the inflationary contribution to the temperature fluctuations measured by the COBE is 90%. The coupling α varies in the range: 10⁻⁷−10⁻¹. This value is not so small, and it is a common characteristics of the supersymmetric unified models with the inflationary scenario. The spectral index n is a little bit smaller than 0.98. The SUGRA corrections are slightly different from the previous consideration. When ξ ≪ 1 and α lies in the above range, the spectral index gets the value consistent with the experimental five-year WMAP data. Comparing with string theory, one gets ξ < 10⁻⁸. Numerical analysis shows that α ≈ 10⁻⁶. To get inflation contribution to the CMBR temperature anisotropy ≈90%, the mass scale M _X < 3.5 × 10¹⁴ GeV.     

Charged Higgs boson in the economical 3-3-1 model

The SU(3) _C ⊗ SU(3) _L ⊗ U(1) _X gauge model with two Higgs triplets (the economical 3-3-1 model) is presented. The minimal Higgs potential is considered in detail, and new Higgs bosons with the mass proportional to the bilepton mass are predicted. In the effective approximation, the charged Higgs bosons H ₂ ^± are scalar bileptons, while the neutral scalar bosons H ⁰ and H ₁ ⁰ do not carry a lepton number. The couplings of the charged Higgs bosons to leptons and quarks are given. We show that Yukawa couplings of H ₂ ^± to ordinary leptons and quarks are lepton-number violating. The pair production of H ₂ ^± at high-energy e ⁺ e ⁻ colliders with the polarization of the e ⁺, e ⁻ beams is studied in detail. A numerical evaluation shows that, if the Higgs mass is not too heavy, then the reaction can give an observable cross section in future colliders at a high degree of polarization. The reaction e ⁺ e ⁻ → H ₂ ^± W ^∓ is also examined. We show that the production cross sections of H ₂ ^± W ^∓ are very small, much below the pair production of H ₂ ^± , and, therefore, the associated production of H ₂ ^± and W ^∓ is, in general, not expected to lead to easily observable signals in the e ⁺ e ⁻ annihilation. The text was submitted by the authors in English.     

Piezoelectric cement-based 1-3 composites

This paper presents a new functional material for smart structure applications. Piezoelectric PZT/cement 1-3 composites that have good compatibility with civil engineering structural materials have been studied. The composites with different volume fractions of PZT ranging from 0.25 to 0.77 were fabricated by the dice-and-fill method. It was found that the 1-3 composites have good piezoelectric properties that agreed quite well with theoretical modeling. The thickness electromechanical coupling coefficient could reach 0.55 in the composite with a ceramic volume fraction of 0.25. Those composites have potential to be used as sensors in civil structure health monitoring systems. PACS 77.65.-j; 77.84.Lf