La掺杂Ti/SnO_2-RuO_2电极材料的制备和电化学性能

采用热分解法制备了掺杂稀土La的Ti/SnO_2-RuO_2电极。对涂层材料作粉末衍射,分析涂层的组成及结构;对电极作强化寿命试验,测定其使用寿命;分别在硫酸、氯化钠溶液及两者混合溶液中作循环伏安曲线,研究电极的电化学性能。结果发现两种电极的合成颗粒结晶度低并且都主要由金红石结构TiO_2、RuO_2和SnO_2组成,掺杂稀土La能够提高电极的电化学性能和电极使用寿命。     

N2分压对（Ti，A1）N涂层成分、结构及力学性能的影响水

采用电弧离子镀工艺,调节N2分压制备了系列（Ti,A1）N硬质涂层,研究了不同N2分压对涂层表面形貌、相结构、成分及力争性能的影响．结果表明,当氮气分压较低时,涂层金属相含量较高,涂层硬度和残余应力较低,膜／基结合力较高,涂层耐磨性较差;当氮气分压较高时,涂层氮化物相含量较高,涂层硬度和残余应力较高,膜／基结合力偏低,涂层耐磨性很强．     

N2分压对（Ti，A1）N涂层成分、结构及力学性能的影响水

采用电弧离子镀工艺,调节N2分压制备了系列（Ti,A1）N硬质涂层,研究了不同N2分压对涂层表面形貌、相结构、成分及力争性能的影响．结果表明,当氮气分压较低时,涂层金属相含量较高,涂层硬度和残余应力较低,膜／基结合力较高,涂层耐磨性较差;当氮气分压较高时,涂层氮化物相含量较高,涂层硬度和残余应力较高,膜／基结合力偏低,涂层耐磨性很强．     

碳纳米管/氟碳乳液复合涂层耐腐蚀性能研究

通过超声波分散技术制备了碳纳米管／氟碳乳液复合涂料。并用交流阻抗谱、极化曲线等测量手段研究了涂覆在A3钢片上碳纳米管／氟碳乳液复合涂层的耐腐蚀性能。结果发现添加较少量的碳纳米管就能显著提高氟碳乳液涂层的耐腐蚀性能。质量分数为3％的碳纳米管／氟碳乳液复合涂层具有较高的阻抗值和腐蚀电位（-0．54V），较低的腐蚀电流密度（大约10^-7.8A／cm^2）,对Q235钢有很好的耐腐蚀效果。     

多彩内墙涂料易出现的问题及正确施工

多彩内墙涂料是一种较为新颖的内墙涂料,是近来发展起来的新型装饰材料。多彩内墙涂料的涂层由底层、中层、面层涂料复合而成,可用于多种基层材料的涂饰,均能获得良好的装饰效果。但是在实际施工过程中,往往会出现一些意想不到的问题．针对这些问题,我们必须采取措施,注意各个环节的正确施工,才能得到令人满意的装饰效果。     

TiO2光触媒纳米涂料的制备及工艺研究

利用多功能分散机制备纳米TiO₂光触媒纳米涂料，对涂料的常规性能及涂料的耐擦洗、耐碱性能进行了研究.采用响应面试验设计方法，分别以纳米TiO₂含量、涂覆厚度和光照强度为因子，优化工艺条件.结果表明，TiO₂含量对涂料的耐碱性没有影响，在TiO₂含量为8%时，耐擦洗度最大；涂料净化甲醛的最佳工艺条件为：纳米TiO₂含量为10.3%,涂覆厚度为250μm,光照强度为40 mW·cm^-2.     

聚合物水泥防水涂料的耐久性研究

聚合物水泥防水涂料是一种水性双组分建筑防水涂料,在建筑领域有着广阔的应用前景。本文研究了浸水处理、碱处理、热老化处理、紫外老化处理对四种配方涂层的表观情况、拉伸性能、吸水率的影响,实验结果表明:经过浸水处理、碱处理后,各配方涂层的抗拉强度和断裂伸长率均呈现下降趋势,经过热老化处理、紫外老化处理后,各配方涂层的抗拉强度均增大,且添加外加剂的涂层7天吸水率均小于无外加剂涂层;当制备涂料聚灰比为0.6,氯丁胶乳/丙烯酸酯乳液为90/10,偶联剂掺量1.5%,消泡剂掺量0.3%时,涂层经处理后,涂层的拉伸性能符合GB/T 23445-2009《聚合物水泥防水涂料》规范中Ⅱ涂料拉伸性能要求,涂层的耐久性优异。     

设计小体积密闭试验舱评价甲醛降解效率

本文设计一个半开放式综合性实验项目,运用自制的小体积密闭试验舱来检测纳米TiO_2材料对甲醛光催化降解性能。实验设计中,对舱体进行综合评价后,选取水热法制备的铁掺杂纳米TiO_2和氮掺杂纳米TiO_2作催化剂降解甲醛,比较了其在可见光下对甲醛的降解效果,最后通过动力学研究可知甲醛在纳米TiO_2表面氧化反应符合一级动力学方程。该综合性实验项目设计覆盖了多学科交叉的综合训练,有助于把学生培养成"具有创新精神和实践能力的高级专门人才"。     

多彩内墙涂料易出现的问题及正确施工

多彩内墙涂料是一种较为新颖的内墙涂料,是近来发展起来的新型装饰材料。多彩内墙涂料的涂层由底层、中层、面层涂料复合而成,可用于多种基层材料的涂饰,均能获得良好的装饰效果。但是在实际施工过程中,往往会出现一些意想不到的问题。针对这些问题,我们必须采取措施,注意各个环节的正确施工,才能得到令人满意的装饰效果。     

环氧树脂改性坡缕石沥青涂料的制备研究

根据高分子共混改性的基本原理,制备了环氧树脂乳液改性坡缕石乳化沥青涂料及防腐涂层,采用电化学极化曲线法和电化学交流阻抗谱研究了该涂料涂层电化学腐蚀行为。结果表明,钠基坡缕石不仅克服了沥青耐磨力、粘结力差和软化点低的缺点,同时与环氧树脂性能互补改善了沥青基涂料冷脆开裂等性能。     

Development of supported boron-doping TiO<Subscript>2</Subscript> catalysts by chemical vapor deposition

In this study, supported nonmetal （boron） doping TiO2 coating photocatalysts were prepared by chemical vapor deposition （CVD） to enhance the activity under visible light irradiation and avoid the recovering of TiO2. Boron atoms were successfully doped into the lattice of TiO2 through CVD, as evidenced from XPS analysis. B-doped TiO2 coating catalysts showed drastic and strong absorption in the visible light range with a red shift in the band gap transition. This novel B-TiO2 coating photocatalyst showed higher photocatalytic activity in methyl orange degradation under visible light irradiation than that of the pure TiO2 photocatalyst.     

Study of 2-Propanol Photocatalytic Degradation on Surface of Phase-Ratio-Controlled TiO<Subscript>2</Subscript> Nanoparticles

The crystal form of TiO₂ is a crucial focus of research on the photocatalytic degradation of gaseous pollutants by TiO₂-based composite photocatalysts. To explore the synergistic effect of mixed crystalline TiO₂ on gaseous organic-pollutant photocatalytic degradation, we synthesized a series of TiO₂ nanoparticles with controllable phase ratios. We explored the role of the TiO₂ phase ratio on the photocatalytic activity and degradation pathway in the photodegradation of 2-propanol (IPA). We estimated the crystallite size and crystal proportions of anatase and rutile by X-ray diffraction. We used the Brunauer–Emmett–Teller method to calculate the specific surface area and Fourier transform infrared spectroscopy to characterize the surface chemistry of the samples. Our results show the photocatalytic activities of pure anatase and the sample with 8.6% rutile to be much better than those of the samples with a phase junction and pure rutile. As such, anatase is the better option for the study of photodegradation design and preparation of gas-phase organic pollutants.     

Effect of Extra-Framework Titanium in TS-1 on the Ammoximation of Cyclohexanone

Titanium silicalite (TS-1) without and with extra-framework titanium have been prepared and TiO_2 is also prepared under the same conditions.All the samples are characterized with XRD,FT-IR,and UV–Vis.The effects of extra-framework titanium in TS-1 on the ammoximation of cyclohexanone have been studied in a continuous slurry reactor.The characterization results reveal that the extra-framework titanium exists as anatase.The catalytic evaluation results show that the anatase has a positive effect on the ammoximation of cyclohexanone by extending the catalytic life because it also exhibits some activity,while the conversion of cyclohexanone and the selectivity to cyclohexanone oxime are not influenced.The anatase TiO_2 does not catalyze H_2O_2 decomposition appreciably compared with TS-1 without extra-framework titanium.The results are very useful in guiding the TS-1 production.     

Photocatalytic activity of lanthanum doping TiO2

The photocatalytic activity of the mixtures of TiO₂ with the rare earth oxide La was investigated. The study on the effect of the rare earth oxide content, calcinating temperature and calcinating time on the performance of the mixture revealed that sample treated under higher temperature and longer time had higher photoactivity than pure TiO₂. The experimental results of polycrystalline X-ray diffraction showed that the extent of the lattice expansion varied with the variation of calcinating temperature of time. It is suggested that this might be due to the variation of La content diffused into the TiO₂ lattice. The La in the lattice may inhibit the recombination of photogenerated electron-hole pairs and thus enhance the photoactivity.     

The Very Best of Me: Longitudinal Associations of Perfectionism and Identity Processes in Adolescence

Personality and identity formation are intricately linked in adolescent development. The personality disposition of perfectionism has been associated with identity processes, but their longitudinal interplay in adolescence has not yet been investigated. This four-wave study, with 5- to 6-month intervals between each wave (N = 744 Caucasian adolescents, M_age = 15.2 years, 55% girls), examined associations between perfectionism (self-oriented and socially prescribed) and identity processes in the domain of future plans. Self-oriented perfectionism predicted increases in commitment making, identification with commitment, and exploration in depth. Socially prescribed perfectionism showed bidirectional positive relations with ruminative exploration. Exploration in depth predicted increases in socially prescribed perfectionism. Findings suggest that perfectionism is an important personality disposition in adolescent identity formation unfolding over time.     

The Development of Empathic Concern in Siblings: A Reciprocal Influence Model

This study utilized actor–partner interdependence modeling to examine the bidirectional effects of younger (M_age = 18 months) and older siblings (M_age = 48 months) on later empathy development in a large (n = 452 families), diverse (42% immigrant) Canadian sample. Controlling for parenting, demographic characteristics, sibling relationship quality, and within-child stability in empathic concern, both younger and older siblings’ observed empathic concern uniquely predicted relative increases in the other's empathy over a period of 18 months. The strength of the partner effects did not differ by birth order. Sex composition moderated the younger sibling partner effect, whereas age gap moderated the older sibling partner effect. This study highlights the important role that siblings play in enhancing the development of care and concern for others.     

Mexican-Origin Youth's Cultural Orientations and Values: Do Older Sisters and Brothers Matter?

Family is an important context for cultural development, but little is known about the contributions of siblings. This study investigated whether older siblings’ cultural orientations and familism values predicted changes in younger siblings’ cultural orientations and familism values across 2 years and tested sibling characteristics and younger siblings’ modeling as moderators. Participants were 246 Mexican-origin younger (M_age = 17.72; SD = 0.57) and older siblings (M_age = 20.65; SD = 1.57) and their parents. Findings revealed that older siblings’ Anglo orientations and familism values interacted with younger siblings’ modeling: When younger siblings reported high modeling, older siblings’ Anglo orientations and values predicted increases in younger siblings’ Anglo orientations and values. Discussion highlights the importance of siblings in cultural socialization.     

Changes in Cortical Sensitivity to Infant Facial Cues From Pregnancy to Motherhood Predict Mother–Infant Bonding

The transition to motherhood triggers changes in human brain structure that may facilitate mother–infant bonding. Although much research on maternal cortical responses to infant faces has focused on the postpartum period, no previous study has examined whether longitudinal functional changes in the maternal cortex during pregnancy and postpartum are associated with mother–infant bonding. Using electroencephalography, prenatal to postnatal changes in cortical sensitivity (P1, P2, late positive potential, N170 event-related potentials) to infant and adult faces were examined in relation to reported mother–infant bonding in 40 mothers (M_age = 30.5 years). Prenatal to postnatal increases in P1 and P2 responses to infant faces predicted stronger bonding. Findings suggest that cortical changes in attention allocation rather than in face-specific encoding enhance bonding.     

高能球磨法制备的含铁TiO2的穆斯堡尔谱研究

1Introduction Oxide dilutedmagneticsemiconductors(O DMS)havedrawnmuchattentioninthelastdecadebecause thesematerialsappeartohavegreatpotentialforuse inspin dependentelectronicdevices[1].Recently,iron cobalt dopedtitaniumdioxideswithroomtemperature ferromagnetismhavebeenreported[2].Specially,the resultsofmagneticpropertiesofFexTi1-xO2(x=0.065and0.250)indicatethatferromagnetismwitha Femagneticmomentislargerthantheonereported forCo[3].ThefabricationmethodsofFe Co doped TiO2includepulsedlaser…     

Comparing two whole task patient simulations for two different dental education topics

We investigated the effect of two types of whole task patient simulations, role-play and web-based, on learning outcomes for two topics, local anesthesia and non-surgical extractions, in a foundational oral maxillofacial surgery course for second year pre-clinical dental students. Using a 2x2 factorial design, we asked which simulation model allows for deeper cognitive engagement that fosters higher learning outcomes for novices practicing complex skills as a professional, a collaborative role-play simulation (Role-Play Sim), or an individually-paced web-based simulation (Web Sim)? In two studies covering two different topics, we compared the effect of these simulations on 50-item multiple-choice knowledge tests. Participants were randomly assigned to one of four groups: No Sim, Web Sim, Role-Play Sim, or Both Sims. For study 1 covering local anesthesia, there was a statistically significant main effect for the Role-Play Sim, F (1, 105) = 103.804, p < 0.001, η_p² = 0.497, but not for the Web Sim, F (1, 105) = 1.655, p = 0.201. Similarly, for study 2 covering extractions, there was a statistically significant main effect for the Role-Play Sim, F (1, 108) = 162.362, p < 0.001, η_p² = 0.601, but not for the Web Sim, F (1, 108) = 0.072, p = 0.798. The interaction term was not statistically significant in either study. Results suggest that role-play simulations achieved a higher level of learning outcomes than the web-based patient simulation.