基于立体光刻的弥散型核燃料的制备

弥散型核燃料芯块中的核素分布强烈的影响反应堆的行为.本研究首次提出将立体光刻快速成型技术应用于氧化镁-氧化钚弥散型陶瓷核燃料的制备,显著地提高了核燃料微球在芯块中的分布均匀性.其中氧化镁作为基体起着结构材料作用,维持芯块的形状并提高核燃料芯块的导热率.文章详细探究了氧化镁粒径对浆料粘度、切片厚度,以及后处理过程对芯块的影响.最终芯块中的氧化镁弥散介质的密度达到3.15 g/cm3(理论密度的88.1％).最终芯块的剖面图表明核燃料微球在芯块中的分布高度均匀,本研究提供了一种制备核素分布高度均匀的弥散型核燃料芯块的新方法.     

Postmodernism and socialist mass housing in Poland

ABSTRACT

In the 1970s and 1980 architects and planners in socialist Poland increasingly attempted to defy the inflexible structure of the state-operated construction industry and modify the by-now ubiquitous system-built mass housing blocks. These efforts generated housing complexes that took up postmodern principles—visually harmonic, legible, and at the same time meaningful urban spaces modelled after historical typologies. On the basis of archival documents, contemporaneous publications, and interviews with the protagonists this article analyses three examples: Radogoszcz-East in ?ód? (1979–1989, designed by Jakub Wujek, Zdzis?aw Lipski, and Andrzej Owczarek), Ró?any Potok in Poznań (1978–2010s, designed by Marian Fikus and Jerzy Gurawski) and the Na Skarpie Scheme in Kraków-Nowa Huta (1987–95, designed by Romuald Loegler, Wojciech Dobrzański, Ewa Fitzke, and Micha? Szymanowski). The article argues that these housing complexes first evolved from late modernist ideas, in particular structuralist currents, and only at a later stage absorbed postmodern theory from both domestic and international sources. It also points to individual architects and planners as the driving forces in the struggle between artistic innovation and systemic inertia, who were able to take advantage of unexpected latitude within the declining socialist regime to carry out their proposals.     

Application of block copolymeric surface modifier with crosslinkable units for montmorillonite nanocomposites

Montmorillonite (MMT) of which the surface was modified with a block copolymer with crosslinkable units was incorporated into methacrylate‐based composites as nanofiller to improve dimensional and mechanical properties. A bifunctional block copolymer containing 2‐isocyanato ethyl methacrylate in one block and poly(vinyl pyridine) units in the other block was prepared as the block copolymeric surface modifier for MMT through controlled/“living” radical polymerization technique. Application of the modified MMT in 2,2‐bis[4‐(2‐hydroxy‐3‐methacryloyl‐oxy)phenyl]propane (bis‐GMA) based composites showed that polymerization shrinkages of the composites decreased as the content of modified MMT increased. Compressive and flexural strengths of the composites were also improved in the presence of the modified MMT, which demonstrate the beneficial effect of the modified MMT as a nanofiller and IEM as a cocrosslinkable unit. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013     

2500t／d新型干法窑产量达到3500t／d的

2500t／d新型干法窑（qb4rex60m）产量达2800t／d较普遍，但华东某厂该规格窑达到了3500t／d熟料。经相关理论计算表明，该规格窑产量达3500t／d是完全可以实现。在此基础上，进行了该规格窑产量达3500t／d熟料时的各主机设备的配置讨论。显然，文中超高产个例的存在与理论分析计算及相关讨论，无疑对工程设计选型理念提出了新的思索与观点。     

The spline alternating group explicit (splage) method for two dimensional problems

A new group explicit iterative method based on cubic spline approximations is presented for the numerical solution of partial differential equations. The numerical results obtained confirm the viability of the method.     

Progress in solvent-free dry-film technology for batteries and supercapacitors

Solvent-free dry-film technology has attracted wide attention due to its ability to avoid pollution/waste caused by poisonous organic solvents, as well as its advantage for energy density enhancement, electrochemical performance improvement and electrode–electrolyte interface compatibility. However, a summary of the research advancements and technology development in this field is still missing. To fill this gap, a complete overview of the technical advantages, development process, principal mechanisms and application fields of solvent-free dry film technology is presented here. Firstly, the history of solvent-free dry-film technology is introduced, followed by detailed discussions on different types of dry-film making methods. Moreover, powder spray and binder fibrillation are emphasized as key methods due to their low-cost mass-production capability, with an elaboration on the associated preparation process including principle, procedure, and parameters. Both patents from the industry and research papers from the academy of the aforementioned two methods are analyzed/summarized for complete information, whose technical advantages are found to be suitable for all solid-state batteries (ASSBs). Based on the insights obtained above, perspectives are given for promoting future development of solvent-free dry-film technology.     

“蒸汽相转化”法制备纳米多级Beta沸石催化材料

由于多级孔沸石具有实际及潜在的应用价值, 合成具有微孔-介孔孔道体系的多孔沸石引起了广泛关注。本研究在不添加二次模板剂的基础上, 采用“蒸汽相转化ȁd;法制备了多级孔Beta沸石催化材料, 对影响多级孔Beta沸石形成因素, 如凝胶碱度、模板剂用量、硅铝比、蒸汽压力和晶化时间等进行了讨论。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、傅立叶变换红外(FT-IR)光谱、拉曼(Raman)光谱、N₂吸附-脱附以及NH₃-TPD等表征手段对制备材料的结构性能进行了表征。在借助红外光谱、拉曼光谱及扫描电镜等表征手段的基础上, 对多级孔Beta沸石的形成机制进行了探索。结果表明: 通过“蒸汽相转化ȁd;法所制备的Beta沸石为纳米多晶聚集体, 这些多晶聚集体由粒径为10~40 nm的初级晶粒构成, 在初级纳米粒子之间形成了2~30 nm的介孔结构; 干胶制备过程中生成的初级和次级结构单元有利于快速形成大量的Beta沸石核, 较高的成核速率有利于Beta沸石纳米晶粒形成, 这些纳米晶粒相互聚集最终形成纳米多晶Beta沸石聚集体。     

三维激光扫描技术在地下建筑三维建模中的应用研究

地下建筑的三维建模日益受到人们重视,本文以长春市某地下车库为实例,对其进行三维建模,介绍了利用三维激光扫描技术进行地下车库三维建模的方法,分析了点云数据的测量精度. 结果表明,与传统方法相比,建模的精度和效率都有很大提高,对地下建筑的三维建模具有借鉴意义.     

Complexation of free-base and 3d transition metal(II) phthalocyanines with fullerene C60: A dispersion-corrected DFT study

We performed a systematic comparative theoretical study of noncovalent interactions of free-base H₂Pc and a series of 3d transition metal(II) phthalocyanines (where the transition metals included manganese, iron, cobalt, nickel, copper and zinc) with fullerene C₆₀, by employing a DFT technique accounting for vdW interactions (PBE GGA functional with a dispersion correction by Grimme). We observed four different types of Pc interaction with fullerene cage, depending on central metal atom. Upon complexation with C₆₀, the macrocyclic plane undergoes distortion in all cases, to a different degree. Some correlation was observed between the calculated formation energies for Pc–fullerene complexes and intermolecular separations in them, where stronger binding is generally associated with shorter M^…C_C60 and N^…C_C60 distances. Despite of considerable differences in the structure of Pc–fullerene complexes, the latter do not exhibit notable variations in the distribution of electrostatic potential, contrary to spin density plots for open-shell species. Similarly, HOMO and LUMO distribution can vary within some limits.     

Intermittent Hypoxic Conditioning Rescues Cognition and Mitochondrial Bioenergetic Profile in the Triple Transgenic Mouse Model of Alzheimer’s Disease

The lack of effective disease-modifying therapeutics to tackle Alzheimer’s disease (AD) is unsettling considering the actual prevalence of this devastating neurodegenerative disorder worldwide. Intermittent hypoxic conditioning (IHC) is a powerful non-pharmacological procedure known to enhance brain resilience. In this context, the aim of the present study was to investigate the potential long-term protective impact of IHC against AD-related phenotype, putting a special focus on cognition and mitochondrial bioenergetics and dynamics. For this purpose, six-month-old male triple transgenic AD mice (3�d7;Tg-AD) were submitted to an IHC protocol for two weeks and the behavioral assessment was performed at 8.5 months of age, while the sacrifice of mice occurred at nine months of age and their brains were removed for the remaining analyses. Interestingly, IHC was able to prevent anxiety-like behavior and memory and learning deficits and significantly reduced brain cortical levels of amyloid-β (Aβ) in 3�d7;Tg-AD mice. Concerning brain energy metabolism, IHC caused a significant increase in brain cortical levels of glucose and a robust improvement of the mitochondrial bioenergetic profile in 3�d7;Tg-AD mice, as mirrored by the significant increase in mitochondrial membrane potential (ΔΨm) and respiratory control ratio (RCR). Notably, the improvement of mitochondrial bioenergetics seems to result from an adaptative coordination of the distinct but intertwined aspects of the mitochondrial quality control axis. Particularly, our results indicate that IHC favors mitochondrial fusion and promotes mitochondrial biogenesis and transport and mitophagy in the brain cortex of 3�d7;Tg-AD mice. Lastly, IHC also induced a marked reduction in synaptosomal-associated protein 25 kDa (SNAP-25) levels and a significant increase in both glutamate and GABA levels in the brain cortex of 3�d7;Tg-AD mice, suggesting a remodeling of the synaptic microenvironment. Overall, these results demonstrate the effectiveness of the IHC paradigm in forestalling the AD-related phenotype in the 3�d7;Tg-AD mouse model, offering new insights to AD therapy and forcing a rethink concerning the potential value of non-pharmacological interventions in clinical practice.