TRAPPED OR ON THE SPRINGBOARD? HOUSING CAREERS IN LARGE HOUSING ESTATES IN EUROPEAN CITIES

ABSTRACT: In the first three decades after the Second World War in Europe millions of dwellings were built, in most cases on large estates in or near cities. At that time, many people in various kinds of household found these estates attractive and were happy to live on them. But, in the last two decades, in many parts of Europe social, economic, and physical problems have emerged and the reputation of the estates has suffered a deep decline. That is not to say that they have lost their function in the housing market: some groups might still be drawn to them—low‐income households who cannot find a decent, affordable place elsewhere, for example. In this article, we describe the current position of these estates in the housing careers of specific groups. Are there some groups who find them attractive places in which to live? Or do most people want to get away as soon as they can? Are some people “trapped”? We show that the situation differs substantially between parts of Europe, but even per estate and per household category. Our findings imply that intervention strategies with regard to these estates will have to become much more differentiated than they currently are.     

Phase Relations in the System Fe2O3–Fe3O4–YFeO3 in Air

Measurements were made of temperature and ternary composition for coexisting liquid and crystalline phases on the air isobar in the system Fe₂O₃-Fe₃O₄-YFeO₃ with particular regard to the stability range and compositional limits of yttrium iron garnet. Phase equilibrium relations were determined by conventional quenching techniques combined with measurements of loss in weight at the reaction temperature to locate true ternary compositions. The intersection of the air isobar with the ternary univariant boundary curve for coexisting magnetite, garnet, and liquid phases results in a eutectic-type situation at the composition Y_0.27Fe_1.73 O_2.87 and 1469°± 2°C. A similar intersection of the isobar with the boundary curve for coexisting garnet, orthoferrite, and liquid phases gives rise to a peritectic-type reaction at 1555° 3°C. and Y_0.44Fe_1.56 O_2.89 The yttrium iron garnet crystallizing from liquids within these temperature and composition limits contains up to 0.5 mole % iron oxide in excess of the stoichiometric formula in terms of the starting composition 37.5 mole % Y₂O₃, 62.5 mole % Fe₂O₃. At 1470° C. the garnet phase in equilibrium with oxide liquid contains 2 mole % FeO in solid solution. The small solubility of excess of iron oxide and partial reduction of the garnet phase in air are unavoidable during equilibrium growth from the melt.     

Probabilistic Bit Stream Neural Chip: Theory

A design for a neural network chip is proposed using probabilistic bit streams to represent real values. This paper analyzes the performance of the proposed neurons in this design and demonstrates that very simple operations can be used to obtain the desired functionality. It is also shown that a suitable ‘activation function’ for neurons of this type can be obtained using the interaction of two probability distributions. Finally, the paper introduces a variant of the back-propagation learning algorithm which involves computing the derivatives of the output with respect to individual weights in a network of such units.     

激光熔区中应力缓解的X射线衍射法测定

AISI 304奥氏体不锈钢表面经激光熔化处理,引入一个大的张应力,它可用注Ne的方法使其缓解本文介绍测量0.1μm薄层应力变化的原理和技术,由测得的应力分布曲线证明了注Ne缓解表面张应力的效果     

发电机内冷却水水质标准的探讨

确定发电机内冷却水质量标准对于发电机的安全运行有重要意义。现有的几个国内标准对于内冷却水水质的要求不尽相同，并正不同程度地应用于化学监督，造成混乱。本文分析比较了各标准的异同，结合电厂运行情况和水处理技术的最新发展，提出了内冷却水各项指标的控制范围。     

CSP生产线轧制力模型的研究及优化

分析了涟钢CSP生产线7机架精连轧机的板带轧制力模型，并针对其在实际生产过程中遇到的一些问题，提出了改进方案，即基于原轧制力模型进行优化，建立了新模型．同时确立了新的变形抗力模型方程．由优化前后的计算和对比分析可知，新模型的精度更好。在生产实际应用中对轧制力的预报准确率大幅度提高。     

热处理对特殊黄铜微观组织及耐磨性的影响

论述了热处理工艺对特殊黄铜微观组织及耐磨性的影响，试验证实：加Ce处理的特殊黄铜，800℃淬火250℃以上温度回火，将会有a相的出现，由于a相在磨损过程中能够松弛应力，减轻应力集中，使磨损颗粒不易形成，从而导致材料的耐磨性也有差异，随着温度的不同，将会有不同形态的网状相析出，350℃时得到的网状a相结构分支形态最复杂，对材料的耐磨性最有利，剥层理论可以给这种现象很好的解释。     

A fast method to study the secretory activity of neuroendocrine cells at the ultrastructural level

Cryo field emission scanning electron microscopy (cryo-FE-SEM) is a versatile technique that allows the investigation of the three-dimensional organization of cells at the ultrastructural level over a wide range of magnifications. Unfortunately, cryopreparation of the specimens for this technique remains cumbersome, in particular because ice crystal formation must be prevented during freezing. Here we report that a light prefixation with glutaraldehyde and incubation in glycerol as cryoprotectant or a high-pressure freezing approach are both excellent procedures for cryopreparation of animal cells to be used in combination with cryo-FE-SEM. Using the proopiomelanocortin-producing intermediate pituitary melanotrope cells of Xenopus laevis as a physiologically inducible neuroendocrine system, we compared the ultrastructural characteristics of inactive and hyperactive neuroendocrine cells. The overall quality of the ultrastructural images was comparable for the two cryopreparation procedures, although some fine structures were better conserved using high-pressure freezing. Melanotrope cells in a secretory inactive state contained numerous storage granules and a poorly developed endoplasmic reticulum (ER), while large amounts of rough ER were present in hyperactive cells. Thus, the cryo-FE-SEM approach described here allows a fast ultrastructural study on the secretory activity of neuroendocrine cells.     

Quantitative detection of gold nanoparticles on individual, unstained cancer cells by scanning electron microscopy

Gold nanoparticles are rapidly emerging for use in biomedical applications. Characterization of the interaction and delivery of nanoparticles to cells through microscopy is important. Scanning electron microscopes have the intrinsic resolution to visualize gold nanoparticles on cells. A novel sample preparation protocol was developed to enable imaging of cells and gold nanoparticles with a conventional below lens scanning electron microscopes. The negative influence of 'charging' on the quality of scanning electron microscopes' images could be limited by deposition of biological cells on a conductive (gold) surface. The novel protocol enabled high-resolution scanning electron microscopes' imaging of small clusters and individual gold nanoparticles on uncoated cell surfaces. Gold nanoparticles could be counted on cancer cells with automated routines.