思想政治教育提升大学生“中国梦”认同意识研究

"中国梦"的提出是思想政治教育特别是理想信念教育、爱国主义教育话语体系的重大创新。加强广大青年学子对"中国梦"的认同意识,充分发挥"中国梦"对大学生的引导、凝聚和激励作用,有利于坚定大学生为中国特色社会主义共同理想奋斗的信心和信念。加强理论研究、增强"中国梦"的感召力;创新课堂教学、提高"中国梦"的亲和力;注重结合实践、提升"中国梦"的推动力;凸显议程设置,强化"中国梦"的渗透力,构成了高校思想政治教育培养大学生"中国梦"认同意识的四个维度。     

江泽民对邓小平科技思想的继承和创新

邓小平的科技思想是马克思主义科技思想在中国的创新和发展,是我国科技事业的理论指南。在历史的新时期,以江泽民为核心的党的第三代中央领导集团继承了邓小平的科技思想,并且创新了邓小平的科技思想。使之在新形势下内容更加丰富。本文以科技的地位、发展的路径、人才的重视、科技法制和科技伦理等为维度来考察江泽民是如何继承和发展邓小平科技思想的。     

A Rhodamine-Based Sensor-for Chromogenic Detection of Cu^2＋ and Fluorescent Detection of Fe^3＋

A rhodamine-benzimidazole conjugate(RB) as a probe was investigated.UV-Vis analysis showed that a strong absorption band at 552 nm was formed with the addition of Cu~(2+),while other transition metal ions induced a little more absorption.The absorption value of RB solution at 552 nm has a linear correlation with Cu~(2+) concentration between 35-70 μmol/L;the detection limit reached 6.82×10~(-2) μmol/L,which is lower than the settled limitation for copper in the drinking water(~30 μmol/L) standardized by World Health Organization(WHO).Moreover,FL analysis showed that only Fe~(3+) could induce large fluorescence intensity enhancement at 582 nm;other common metal ions including Cu~(2+) cannot induce the enhancement.There was a good linear correlation between relative fluorescence intensity and Fe~(3+) concentration ranging from 2 μmol/L to 20 μmol/L,and the detection limit reached1.70×10~(-2) μmol/L.The results showed that RB could detect Cu~(2+)and Fe~(3+) simultaneously,with the UV-Vis and fluorescence spectroscopy,respectively.     

Effects of H content on the tensile properties and fracture behavior of SA508-III steel

SA508-Ⅲ steel was charged with different hydrogen (H) contents using a high-pressure thermal charging method to study the effects of H content on the tensile properties and evaluate the H embrittlement behavior of the steel. The results indicate that the ultimate tensile strength remains nearly unchanged with the addition of H. In contrast, the yielding strength slightly increases, and the elongation significantly decreases with increasing H content, especially at concentrations exceeding 5.6×10-6. On the basis of fractographic analysis, it is clear that the addition of H changes the fracture mode from microvoid coalescence to a mixture of river patterns and dimples. Carbides are strong traps for H; thus, the H atoms easily migrate in the form of Cottrell atmosphere toward the carbides following moving dislocations during tensile deformation. In addition, stress-induced H atoms accumulate at the interface between carbides and the matrix after necking under three-dimensional stress, which weakens the interfacial bonding force. Consequently, when the local H concentration reaches a critical value, microcracks occur at the interface, resulting in fracture.     

Influence of silicon on the microstructures,mechanical properties and stretch-flangeability of dual phase steels

Uniaxial tension tests and hole-expansion tests were carried out to determine the influence of silicon on the microstructures, mechanical properties, and stretch-flangeability of conventional dual-phase steels. Compared to 0.03wt% silicon, the addition of 1.08wt% silicon induced the formation of finer ferrite grains (6.8 μm) and a higher carbon content of martensite (C_m ≈ 0.32wt%). As the silicon level increased, the initial strain-hardening rate (n value) and the uniform elongation increased, whereas the yield strength, yield ratio, and stretch-flangeability decreased. The microstructures were observed after hole-expansion tests. The results showed that low carbon content martensite (C_m ≈ 0.19wt%) can easily deform in coordination with ferrite. The relationship between the mechanical properties and stretch-flangeability indicated that the steel with large post-uniform elongation has good stretch-flangeability due to a closer plastic incompatibility of the ferrite and martensite phases, which can effectively delay the production and decohesion of microvoids.     

Influence of high deformation on the microstructure of low-carbon steel

Low-carbon steel sheets DC04 used in the automotive industry were subjected to cold rolling for thickness reduction from 20% to 89%. The desired thickness was achieved by successive reductions using a rolling mill. The influence of thickness reduction on the microstructure was studied by scanning electron microscopy. Microstructure evolution was characterized by the distortion of grains and the occurrence of the oriented grain structure for high cold work. A mechanism of grain restructuring for high cold work was described. The occurrence of voids was discussed in relation with cold work. The evolution of voids at the grain boundaries and inside the grains was also considered. To characterize the grain size, the Feret diameter was measured and the grain size distribution versus cold work was discussed. The chemical homogeneity of the sample was also analyzed.     

Effects of the types of overlap on the mechanical properties of FSSW welded AZ series magnesium alloy joints

The effects of the types of overlap on the mechanical properties of the friction stir spot welding (FSSW) welded AZ series magnesium alloy joints were investigated by microstructural observations, microhardness tests, and tensile tests. The results show that the microstructure of the stir zone adjacent to the periphery of the rotating pin is mainly composed of the upper sheet. The average distance D between the longitudinal segment of the curved interface and the keyhole periphery, the tensile shear force, and the microhardness of the stir zone of the FSSW welded AZ61 alloy joint are the highest in all samples. During FSSW of AZ31 and AZ61 dissimilar magnesium alloys, the irregular deformation of the longitudinal segment of the curved interface appears, while the microhardness of the stir zone is higher when AZ61 alloy is the upper sheet. Moreover, the microhardness of the stir zone increases initially and then decreases sharply in the longitudinal test position.     

基于地域文化的隧道洞口景观设计研究

目的在于探讨地域文化与隧道洞口景观设计相结合的设计思路.采用对不同洞门类型的隧道洞口进行研究、归纳的方法,和对地域文化进行收集、整理、分析、提取的方法,结合不同类型的隧道洞口进行专题性的景观设计.隧道洞口的设计不仅要满足结构的合理性和使用的安全性,同时,如何更好的满足人们对于感官上的需求,做到科学和人文交相辉映,是探讨的重点.在都汶高速隧道洞口景观设计的基础上,对地域文化与隧道洞口景观设计相结合进行了较为深入的总结和思考.     

Effect of poly(vinyl pyrrolidone ) on the morph ology and physical properties of poly(vinyl alcohol) /sodium montmorill onite nanocompos ite films

Nanocomposites of poly(vinyl alcohol)(PVA),poly(vinyl pyrrolidone)(PVP) and sodium montmorillonite(Na~+MMT) were prepared by solution mixing and then cast into films.X-ray diffraction analysis and images of transmission electron microscopy establish the formation of PVA/Na~+MMT intercalated nanocomposite.Exfoliated and highly intercalated PVA/PVP/Na~+MMT nanocomposite formed in the presence of PVP.Inclusion of PVP in PVA/Na~+MMT matrix enhances the hydrogen bonding interactions between PVA and Na~+MMT and thus increases the mechanical properties and thermal stability of PVA/PVP/Na~+MMT nanocomposites compared to PVA/Na~+MMT nanocomposite.The interactions between PVA,PVP and Na~+MMT were established by the Fourier transform infrared spectroscopy.The moisture absorption tendency of both the PVA and PVA/PVP films reduced after the incorporation of Na~+MMT at 75%constant relative humidity.Differential scanning calorimetry studies show that the presence of PVP and Na~+MMT both are responsible for reducing the heat of fusion,and crystallinity of PVA.The flow behavior of the PVA,PVA/PVP and its nanocomposite solutions has been also studied.Water vapor permeability of PVA/PVP/Na~+MMT composite films decreased in the presence of nanoclay due to increasing tortuous paths for diffusion.     

Prenatal and early life home environment exposure in relation to preschool children’s asthma, allergic rhinitis and eczema in Taiyuan, China

Prenatal and early life home environment might be related to children’s asthma or allergic diseases later in life.A cross-sectional epidemiological study was designed and a questionnaire survey was performed in 3700 preschool children in urban areas in Taiyuan,Shanxi Province,China.Questions on children’s asthma and allergic diseases from the International Study on Asthma and Allergies in Childhood(ISAAC)were integrated with questions on home environment from the Swedish Dampness in Buildings and Health(DBH)study,appropriately modified for Chinese life habits.By multivariate regression analyses controlling for age,gender,heredity,location in urban/suburban or rural areas,environmental tobacco smoke(ETS)and breastfeeding,we found that home new furniture(HNF)before birth(referring to 1 year before pregnancy and during pregnancy)was positively associated with wheezing ever(odds ratio(OR)1.23 with 95%CI of 1.03–1.48)and wheezing last 12 months(1.24,1.00–1.54),allergic rhinitis(AR)(1.26,1.06–1.51),and eczema(1.42,1.01–1.99).HNF between 0–1 years old was also positively associated with wheezing last 12 months.Home new decoration(HND)during 0–1 years old was positively associated with AR symptoms and eczema symptoms,more in the last 12 months.Stronger positive associations were found for signs of home mold and dampness with almost all children’s asthmatic and allergic symptoms(OR ranging from 1.23–1.85,P<0.05).By mutual adjustment between HNF before children’s birth and home mold or dampness,all the significance remained unchanged.Prenatal HNF and home mold or dampness was independently associated with children’s asthmatic and allergic diseases later in life.