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article

Negatywne skutki niskiej stopy bezrobocia w aspekcie mikro- oraz makrostrukturalnym

JAN RADOMSKI

Przegląd Krytyczny > 2019 > 1 > 1 > 70-88

Artykuł stanowi analizę niskiej stopy bezrobocia jako faktu społecznego, który stał się stanem pożądanym dla wszystkich funkcjonujących obecnie modeli gospodarczych oraz politycznych, przez co codzienna narracja medialna najczęściej pomija jego negatywne aspekty. Dzięki użyciu pojęć i teorii wypracowanych na gruncie socjologii (np. Emile’a Durkheima czy Ervinga Goffmana), autor omawia najważniejsze...

article

Deux nouvelles espèces de brachiopodes rhynchonelliformes de l’Albien stratotypique (Bassin de Paris) – mise au point

Danièle Gaspard

Annales de Pal�ontologie > 2017 > 103 > 2 > 93-100

Two new Rhynchonellide brachiopods from the Albian stratotype region (Paris Basin) (Dipoloceas cristatum zone), analyzed according to their external morphology and internal characters completed by the observation of their corresponding microstructure, are set apart from a cluster of specimens previously recognized as Rhynchonella sulcata d’Orbigny. They correspond to Lamellaerhynchia carronensis n...

article

Study and Modeling of Annealing Regimes in Bell Furnaces for Cold-Rolled High-Strength Microalloyed Steels

A. I. Zaitsev, A. V. Koldaev, Yu. S. Gladchenkova, N. G. Shaposhnikov, more

Metallurgist > 2016 > 60 > 5-6 > 602-611

A detailed study is performed on laboratory melted model high-strength steels microalloyed with niobium of features of the change in microstructure, mechanical properties, and excess phase precipitate formation in relation to hot rolling and bell furnace annealing parameters. It is established that an increase in annealing temperature and duration leads to a reduction in the level of mechanical properties...

article

Studies on the microstructure of epoxy-cement composites

Łukowski, P., Łukowski, P.

Archives of Civil Engineering > 2016 > 2

article

Influence of deformation rate on microstructure, texture and mechanical properties of indirect-extruded Mg–Zn–Ca alloy

L.B. Tong, M.Y. Zheng, L.R. Cheng, D.P. Zhang, more

Materials Characterization > 2015 > 104 > Complete > 66-72

As-cast Mg–5.3Zn–0.6Ca (weight percent) alloy was indirectly extruded at 300°C with different deformation rates (ram speeds of 0.1, 0.3, 0.5mms ⁻¹ ), and the microstructure, texture and mechanical properties of the as-extruded alloys were investigated in the current study. With the increase of deformation rates, the average size and volume fraction of dynamic recrystallized grains were remarkably...

article

Space constraints govern fate of hematopoietic stem and progenitor cells in vitro

Eike Müller, Tatyana Grinenko, Tilo Pompe, Claudia Waskow, more

Biomaterials > 2015 > 53 > Complete > 709-715

Deciphering exogenous cues that determine stem cell fate decisions is a persisting challenge of cell biology and bioengineering. In an effort to unravel the role of spatial constraints in the cell-instructive characteristics of bone marrow microenvironments, murine hematopoietic stem and progenitor cells (HSPC) were exposed to fibronectin-coated microcavities in vitro. Microcavity sizes were chosen...

article

Influence of Ce addition on the structural, magnetic, and magnetocaloric properties in La0.7−xCexSr0.3MnO3 (0≤x≤0.3) ceramic compound

M.S. Anwar, Faheem Ahmed, Bon Heun Koo, M.S. Anwar, more

Ceramics International > 2015 > 41 > 4 > 5821-5829

We report improvement in the magnetocaloric properties of Ce-doped lanthanum manganites. Polycrystalline La _0.7−x Ce _x Sr _0.30 MnO ₃ (0≤x≥0.3) samples were prepared using the conventional solid-state reaction method with phase purity and structure confirmed using X-ray diffraction. Temperature dependent magnetization measurements and Arrott analysis reveal second order...

article

Optimization of the solution heat treatment process to improve mechanical properties of 319 Al alloy engine blocks using the billet casting method

A. Lombardi, C. Ravindran, R. MacKay, A. Lombardi, more

Materials Science & Engineering A > 2015 > 633 > Complete > 125-135

The use of Al engine blocks has increased significantly to improve vehicle fuel efficiency. However, the large tensile residual stress along the cylinder bores necessitates the optimization of mechanical properties in this region to prevent premature engine failure. This study, utilizing billet castings which replicate the microstructure along the engine cylinder bores, observed the influence of varying...

article

Permeability of porous ceramic based on calcium carbonate as pore generating agent

L. Simão, R.F. Caldato, M.D.M. Innocentini, O.R.K. Montedo, more

Ceramics International > 2015 > 41 > 3 Part B > 4782-4788

This study concerns the processing and characterization of porous ceramics based on low cost mineral raw materials for environmental applications. Three formulations were tested with calcium carbonate as pore generating agent and different proportions of kaolin, potassic feldspar, albite, quartz and white clay. Ceramic bodies were formed by pressing, heat treated up to 1180°C and characterized for...

article

Novel middle permittivity ceramic Ba4CoTi11O27: Sintering characteristic, cations distribution, crystal structure and microwave dielectric properties

Huanfu Zhou, Yanbing Miao, Jungu Xu, Jianzhang Gong, more

Ceramics International > 2015 > 41 > 3 Part B > 5191-5195

Novel middle permittivity microwave dielectric ceramic with the composition of Ba ₄ CoTi ₁₁ O ₂₇ was prepared by a solid-state reaction process. The crystal structure, sintering behavior and microwave dielectric properties of ceramics were investigated using X-ray diffraction, scanning electron microscopy and dielectric measurement. The Ba ₄ CoTi ₁₁ O ₂₇...

article

Fabrication and characterization of single phase cordierite honeycomb monolith with porous wall from natural raw materials as catalyst support

Omar A. Al-Harbi, Cem Özgür, M.M. Khan, O.A. Al-Harbi, more

Ceramics International > 2015 > 41 > 3 Part A > 3526-3532

A low-cost, single phase cordierite honeycomb monolith whose walls are highly porous has been prepared by the extrusion method using local natural raw materials, as kaolinite and magnesite from Saudi Arabia without need of any organic additives. The characterization of the achieved monoliths has focused on the phase evaluations and microstructures development depending on batch compositions and sintering...

article

Effects of different freezing methods on the quality and microstructure of lotus (Nelumbo nucifera) root

Jing Tu, Min Zhang, Baoguo Xu, Huihua Liu

International Journal of Refrigeration > 2015 > 52 > Complete > 59-65

The effects of three freezing methods, air blast freezing (ABF), immersion freezing (IF) and ultrasound-assisted immersion freezing (UIF), on quality and microstructure of lotus roots were investigated. The parameters used to evaluate the freezing methods effect were the freezing time, color, firmness, drip loss, vitamin C and microstructure of the final frozen products. The results showed that the...

article

Development of a high strength Al–Mg2Si–Mg–Zn based alloy for high pressure die casting

Shouxun Ji, Feng Yan, Zhongyun Fan, S. Ji, more

Materials Science & Engineering A > 2015 > 626 > Complete > 165-174

A high strength Al–Mg ₂ Si–Mg–Zn based alloy has been developed for the application in high pressure die casting to provide improved mechanical properties. The effect of various alloying elements on the microstructure and mechanical properties including yield strength, ultimate tensile strength and elongation of the alloy was investigated under the as-cast and heat-treated conditions. The...

article

An investigation into microstructure and mechanical properties of cold sprayed 7075 Al deposition

M.R. Rokni, C.A. Widener, G.A. Crawford, M.K. West, more

Materials Science & Engineering A > 2015 > 625 > Complete > 19-27

Cold spray deposition is well known to produce a highly deformed microstructure with large strain gradients across the individual particles composing the deposited layer. This study investigates the relationship between the as-deposited cold spray microstructure and the resulting local and coating-scale mechanical properties of 7075 aluminum powder deposited onto wrought 7075 aluminum substrates via...

article

Microstructure and electrical relaxation studies of chemically derived Gd–Nd co-doped nanocrystalline ceria electrolytes

Sk. Anirban, T. Paul, Proloy T. Das, T.K. Nath, more

Solid State Ionics > 2015 > 270 > Complete > 73-83

Gd and Nd co-doped ceria nanocrystalline materials [Ce _0.9 Gd _0.1-x Nd _x O _1.95 (0≤x≤0.1)] were successfully prepared through citrate–nitrate auto-ignition method. Rietveld refinement of the X-ray diffraction profiles was performed to get detailed microstructural information of the prepared samples. It had been found that with an increase of Nd concentration, the lattice...

article

Microstructural Characteristics of Mold Fluxes Associated to their Thermal Behavior

Edgardo Benavidez, Elena Brandaleze, Leadro Santini, Alejandro Martin, more

Procedia Materials Science > 2015 > 8 > Complete > 218-227

During continuous casting process of steels, several problems can arise when an inadequate heat removal in the mold is produced. This heat extraction occurs through mold powder layers formed between the cooled mold and the solidifying steel. At operating temperatures, the mold flux forms glassy and crystalline phases that affect the heat transfer from the steel to the mold.In this paper, thermal conductivity...

article

The effect of strontium oxide replacing calcium oxide on the crystallization and thermal expansion properties of Li2O–CaO–SiO2 glasses

S.M. Salman, S.N. Salama, Ebrahim A. Mahdy, S.M. Salman, more

Ceramics International > 2015 > 41 > 1 Part A > 137-143

The crystallization process and thermal expansion characteristics of glass compositions based on 17.80Li ₂ O–(32.20−x) CaO (xSrO)–50SiO ₂ system (where x=3, 6, 9 and 12mol%) were investigated. The crystallization characteristics of the glasses, the type of crystalline phases formed as well as the resulting microstructure were traced by means of differential thermal analysis (DTA),...

article

Enhanced mechanical properties of WC-reinforced Al2O3 ceramics via spark plasma sintering

Wei-Hsio Chen, Pramoda K. Nayak, Hao-Tung Lin, Alex C. Lee, more

Ceramics International > 2015 > 41 > 1 Part B > 1317-1321

We report the enhanced mechanical properties of WC-reinforced Al ₂ O ₃ nano composites fabricated by spark plasma sintering (SPS). The addition of WC accelerates the sintering process and helps in improving the mechanical properties of Al ₂ O ₃ matrix by hindering its grain growth. The resulting microstructure shows uniformity with a grain size of 300–500nm. Due to...

article

Properties and microstructure of a natural slip zone in loose deposits of red beds, southwestern China

Jian Chen, Fuchu Dai, Ling Xu, Song Chen, more

Engineering Geology > 2014 > 183 > Complete > 53-64

The loose deposits of red beds located in southwestern China are vulnerable to the occurrence of landslides. In this paper, a shallow progressive landslide developed in loose deposits of red beds was selected as a case study, and the physical and mechanical properties of the main slip zone were analyzed in detail. It was observed that the main slip zone of the progressive landslide is composed of...

article

Microstructures and magnetic properties of meta-stable Co50−XMXPt50 (M=Cu or Ru) thin films

An-Cheng Sun, Chuan-Fa Huang, Sheng-Fu Chen, Yu-Shen Chen, more

Thin Solid Films > 2014 > 570 > Part B > 580-584

Co _50−X M _X Pt ₅₀ (M=Cu or Ru) films were magnetron sputtered on textured Pt(111) underlayer on glass substrate at 350°C. The results show that perpendicular magnetic anisotropy of superlattice L1 ₁ phase can be maintained well with doping Cu element into CoPt film. Out-of-plane coercivity (H _c⊥ ) was also increased with the increase of Cu content. However,...

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Negatywne skutki niskiej stopy bezrobocia w aspekcie mikro- oraz makrostrukturalnym

Deux nouvelles espèces de brachiopodes rhynchonelliformes de l’Albien stratotypique (Bassin de Paris) – mise au point

Study and Modeling of Annealing Regimes in Bell Furnaces for Cold-Rolled High-Strength Microalloyed Steels

Studies on the microstructure of epoxy-cement composites

Influence of deformation rate on microstructure, texture and mechanical properties of indirect-extruded Mg–Zn–Ca alloy

Space constraints govern fate of hematopoietic stem and progenitor cells in vitro

Influence of Ce addition on the structural, magnetic, and magnetocaloric properties in La0.7−xCexSr0.3MnO3 (0≤x≤0.3) ceramic compound

Optimization of the solution heat treatment process to improve mechanical properties of 319 Al alloy engine blocks using the billet casting method

Permeability of porous ceramic based on calcium carbonate as pore generating agent

Novel middle permittivity ceramic Ba4CoTi11O27: Sintering characteristic, cations distribution, crystal structure and microwave dielectric properties

Fabrication and characterization of single phase cordierite honeycomb monolith with porous wall from natural raw materials as catalyst support

Effects of different freezing methods on the quality and microstructure of lotus (Nelumbo nucifera) root

Development of a high strength Al–Mg2Si–Mg–Zn based alloy for high pressure die casting

An investigation into microstructure and mechanical properties of cold sprayed 7075 Al deposition

Microstructure and electrical relaxation studies of chemically derived Gd–Nd co-doped nanocrystalline ceria electrolytes

Microstructural Characteristics of Mold Fluxes Associated to their Thermal Behavior

The effect of strontium oxide replacing calcium oxide on the crystallization and thermal expansion properties of Li2O–CaO–SiO2 glasses

Enhanced mechanical properties of WC-reinforced Al2O3 ceramics via spark plasma sintering

Properties and microstructure of a natural slip zone in loose deposits of red beds, southwestern China

Microstructures and magnetic properties of meta-stable Co50−XMXPt50 (M=Cu or Ru) thin films

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