Microstructural characterization of Mg–Al–O rich nanophase strengthened Fe–Cr alloys

Publication date: Available online 11 November 2019Source: Materials Science and Engineering: AAuthor(s): Lei Dai, Zhong Liu, Liming Yu, Yongchang Liu, Zengmin ShiAbstractFe–9Cr ODS alloys elaborated by mechanical milling (MM) and followed by hot isostatic pressing (HIP) and hot rolling (HR) have been studied using transmission electron microscopy (TEM) and atom probe tomography (APT) to understand their microstructural characterization. The as-HIP alloy exhibited equiaxed ferrite and contained nanoparticles and low density of dislocations. The as-HR alloy manifested elongated ferrite and contained nanoclusters and high density of dislocations. Characteristics of Mg–Al–O rich nanophase may give insight into competitive behavior between nanofeatures’ constituents which involves nucleation of Mg–Al–O cluster as core at first and then segregation of W and Y at peripheral location. Fracture morphology of tensile test specimens at room temperature is also revealed by scanning electron microscope (SEM). That for the as-HIP alloy is a single ductile fracture (dimples), while the as-HR alloy exhibits a mixed mode of cleavage and ductile fracture characterized by steps, facets and limited ductile ridges (dimples). The SEM observations indicate that Mg–Al–O rich nanophase can serve as a source of dimples and cracks formation (in both alloys), and especially that significant impediment of crack propagation (only in the as-HR alloy) which r...
Source: Materials Science and Engineering: A - Category: Materials Science Source Type: research

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Conclusion EMC should be considered first from an EE’s perspective, addressing concerns at the PCB level. MEs can get involved when enclosing the PCB or device. This is a collaborative effort. Both specialties should work through planning and execution. The ability to leverage a range of materials and components for EM enclosures allows engineers to make informed choices to meet the EMC requirements of a device. When considered at early stages, engineers can make EM an integral part of the design approach.
Source: MDDI - Category: Medical Devices Authors: Tags: Electronics Source Type: news
CASE SUMMARY: A 62-year-old previously healthy man presented with left lower quadrant pain and fever. Physical examination showed left lower quadrant peritonitis. Computed tomography scan showed a pelvic abscess with extraluminal air (Fig. 1). Intravenous antibiotics were started, and CT-guided percutaneous drainage was performed. The drain was removed 1 week after discharge. One week later, he presented with dysuria and pneumaturia and was started on antibiotics. Colonoscopy confirmed diverticulosis with no other mucosal abnormalities. He underwent a successful laparoscopic sigmoidectomy with colovesical fistula takedown.
Source: Diseases of the Colon and Rectum - Category: Gastroenterology Tags: Resident’s Corner Source Type: research
Publication date: March 2020Source: Materials Today Communications, Volume 22Author(s): Alexandra L. Nikolaeva, Iosif V. Gofman, Alexander V. Yakimansky, Elena M. Ivan’kova, Natalia S. Gulii, Maria A. Teplonogova, Olga S. Ivanova, Alexander E. Baranchikov, Vladimir K. IvanovAbstractA series of polyimide/CeO2 nanocomposite films were fabricated based on three polymer matrices. The prepared films were characterized by scanning electron microscopy (SEM), thermomechanical analysis (TMA), and also simultaneous thermogravimetric (TGA) and differential thermal analysis (DTA), the latter two having been performed both in air...
Source: Materials Today Communications - Category: Materials Science Source Type: research
Publication date: April 2020Source: Materials Science and Engineering: C, Volume 109Author(s): Yun-shan Wei, Zhi-cheng Niu, Feng-qi Wang, Kun Feng, Min-hua Zong, Hong WuAbstractPickering emulsion (PE) stabilized by bio-compatible polymer nanoparticles (NPs) was first developed for the encapsulation of lipophilic tocopheryl acetate (TA) for its application in cosmetics. The poly(lactide-co-glycolide) (PLGA)/poly(styrene-co-4-styrene-sulfonate) (PSS) NPs were prepared by solvent displacement, and then they were used as emulsifier particles to fabricate TA-encapsulated PE. It was found that the TA encapsulation efficiency was...
Source: Materials Science and Engineering: C - Category: Materials Science Source Type: research
Publication date: 15 February 2020Source: Materials Letters, Volume 261Author(s): Farahnaz Haftlang, Abbas Zarei-Hanzaki, Hamid Reza AbediAbstractTi–29Nb–14Ta–4.5Zr (TNTZ) bio-alloy was processed against Ti–6Al–4V extra-low interstitial as a counter-body material in sliding friction mode under the low applied load of 2 N and very high sliding velocity of 300 mm/s. The near-surface micro-texture evolution induced by frictional force has been investigated in detail using Electron back-scattered diffraction analysis in scanning electron microscope (SEM-EBSD) and Angle selective back-sca...
Source: Materials Letters - Category: Materials Science Source Type: research
We describe a comprehensive effort that merges and harmonizes a large-scale dataset of 10,477 structural brain MRI scans from participants without a known neurological or psychiatric disorder from 18 different studies that represent geographic diversity. We use this dataset and multi-atlas-based image processing methods to obtain a hierarchical partition of the brain from larger anatomical regions to individual cortical and deep structures and derive age trends of brain structure through the lifespan (3–96 years old). Critically, we present and validate a methodology for harmonizing this pooled dataset in the presenc...
Source: NeuroImage - Category: Neuroscience Source Type: research
Publication date: Available online 9 December 2019Source: NeuroImageAuthor(s): Robert A. Brown, Dumitru Fetco, Robert Fratila, Giulia Fadda, Shangge Jiang, Nuha M. Alkhawajah, E. Ann Yeh, Brenda Banwell, Amit Bar-Or, Douglas L. Arnold, Canadian Pediatric Demyelinating Disease NetworkAbstractIn conventional non-quantitative magnetic resonance imaging, image contrast is consistent within images, but absolute intensity can vary arbitrarily between scans. For quantitative analysis of intensity data, images are typically normalized to a consistent reference. The most convenient reference is a tissue that is always present in th...
Source: NeuroImage - Category: Neuroscience Source Type: research
Publication date: 25 April 2020Source: Food Chemistry, Volume 310Author(s): Hao Dong, Yanping Xian, Haixia Li, Yuluan Wu, Weidong Bai, Xiaofang ZengAbstractUltrahigh-performance liquid chromatography coupled to quadrupole Orbitrap high-resolution mass spectrometry (UHPLC–Q-Orbitrap-HRMS) was used for the screening and determination of 14 heterocyclic aromatic amines (HAAs) in Chinese traditional bacon and sausage. HAAs were extracted from samples using sodium hydroxide solution with acetonitrile, and purified by solid-phase extraction. UHPLC–Q-Orbitrap-HRMS acquired full MS data for quantification, and UHPLC&nd...
Source: Food Chemistry - Category: Food Science Source Type: research
In this study, we used genetically and biochemically well characterized cells bearing the pathogenic microdeletion m.15,649–15,666 (ΔI300-P305) in MT-CYB gene, to investigate the effects of an assembly-hampered CIII on the re-organization of supercomplexes. First, we found that this mutation also affects the stability of both CI and CIV, and evidences the occurrence of a preferential structural interaction between CI and CIII2, yielding a small amount of active CI + CIII2 supercomplex. Indeed, a residual CI + CIII combined redox activity, and a low but detectable ATP synthesis driven by CI substrates ar...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - Category: Biochemistry Source Type: research
Publication date: Available online 9 December 2019Source: PolymerAuthor(s): O.I. Timaeva, N.A. Arkharova, A.S. Orekhov, V.V. Klechkovskaya, S.P. Mulakov, G.M. Kuz'micheva, I.I. PashkinAbstractComposite hydrogels in the poly-N-vinylpyrrolidone – RE(NO3)3 × xH2O system with RE = La, Gd, Yb were prepared in various forms (native, native dried in the air, dried in air and ground into powder). They were studied by methods of wide- and small-angle X-ray scattering, differential scanning calorimetry, scanning electron microscopy, and electron microprobe analysis. The composition of native PVP and PVP with powd...
Source: Polymer - Category: Chemistry Source Type: research
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