A. Minstens vijf van onderstaande symptomen zijn aanwezig geweest gedurende de laatste twee weken en wijzen op een verandering ten opzichte van het eerdere functioneren. Tenminste één van de symptomen is een depressieve stemming (1) of verlies van interesse of plezier (2). 1. Depressieve stemming gedurende het grootste deel van de dag, bijna elke dag; 2. Duidelijke vermindering van interesse of plezier in bijna alle activiteiten; 3. Duidelijke gewichtsvermindering zonder dat dieet wordt gehouden, of gewichtstoename; 4. Slapeloosheid of overmatige slaperigheid; 5. Psychomotore agitatie of remming; 6. Moeheid of verlies van energie, bijna elke dag; 7. Gevoelens (die waanachtig kunnen zijn) van waardeloosheid of overmatige schuldgevoelens, bijna elke dag; 8. Verminderd vermogen tot nadenken, concentratie of besluiteloosheid, bijna elke dag; 9. Terugkerende gedachten aan de dood, terugkerende suïcidegedachten zonder dat er specifieke plannen gemaakt zijn, of een suïcidepoging of een specifiek plan om suïcide te plegen. B. De patiënt heeft niet ook kenmerken van een manische episode. C. De symptomen veroorzaken in significante mate lijden of beperkingen in het sociaal of beroepsmatig functioneren of het functioneren op andere belangrijke terreinen. D. De symptomen zijn niet het gevolg van de directe fysiologische effecten van een middel (bijvoorbeeld drug, geneesmiddel) of een somatische aandoening (bijvoorbeeld hypothyreoidie).

Toolkit 설정 편집

食物アレルゲンの吸収機構の解明と食物アレルギーの発症に関する研究 (特集 日本膜学会膜学研究奨励賞(2015)受賞総説)

Some studies on P91 steel and their weldments

Self-lubricating materials are becoming more widespread in fields like metal forming or power generation due to the inability to use conventional lubricants in high-temperature (HT) applications. I...

Tribological behaviour of self-lubricating materials at high temperatures

Laser surface alloying on aluminum and its alloys: A review

https://research-information.bris.ac.uk/ws/files/52493122/Study_on_the_Effect_of_Post_Weld_Heat_Treatment.pdf

Study on the effect of post weld heat treatment parameters on the relaxation of welding residual stresses in electron beam welded P91 steel plates

Commercial purity aluminum sheets were anodized at 10–30 V in 10% oxalic acid solution at room temperature. The anodized specimens were tested for its resistance against scratch damage using a microscratch adhesion tester operated in the progressive mode. The specimens were studied also for crystal structure, chemical composition, surface morphology, surface topography, microhardness and electrical resistivity by X-ray diffractometry, energy dispersive X-ray spectroscopy, field emission scanning electron microscopy, stylus based surface profilometer, Vickers microhardness tester and four point probe method, respectively. Microscratch test results showed improved adhesion of the anodic aluminum oxide coating with the untransformed bulk, as the anodizing potential decreased. During scratch test, the specimens showed formation of cohesive cracks at a load of 1 N. Energy dispersive X-ray analysis showed that the concentration of oxygen increased marginally on increasing the anodizing potential. Field emission scanning electron microscopy showed comparatively less porous microstructure of the anodized specimens for anodizing conducted at potential 20 V or lower. The results of profilometry showed formation of smooth coating surface at potentials lower than 25 V. Microhardness test showed increased hardness of the anodized aluminum with increasing anodizing potential. The electrical resistivity of anodized aluminum was in the range of 10 6 –10 9  Ω·cm. X-ray diffraction measurements indicated amorphous structure of the so obtained aluminum oxide coating.

Scratch behavior of aluminum anodized in oxalic acid: Effect of anodizing potential

Residual stresses in 9 mm thick ASTM A387 Grade 91 steel plates, joined using constant power (8 kW) low and high heat input laser welding processes, are characterised using neutron diffraction. The measured longitudinal and normal components of residual stress show a bimodal distribution across the welded joint with a low tensile or compressive trough at the weld centre flanked by high magnitude tensile peaks in parent metal adjacent to the heat affected zone boundaries. The width of the central trough and spread of the outboard tensile zones are significantly greater for the high heat input weld. In both cases, the stress distributions can be explained by the strains associated with the austenite to martensite solid-state transformation as the joint cools after welding.

Residual stresses in laser welded ASTM A387 Grade 91 steel plates

Thermo-metallurgical and thermo-mechanical computations for laser welded joint in 9Cr–1Mo(V, Nb) ferritic/martensitic steel

In the current study, welding of TZM (molybdenum-based alloy) plates in square-butt configuration was carried out using electron beam and laser-GTAW hybrid power sources. Microstructures of weld joint containing three zones—parent metal, heat-affected zone, and fusion zone—were clearly identified when examined through optical and scanning electron microscopy. The weld joints were found to be sound with very wide fusion and heat-affected zones. The microstructure of the fusion zone was coarse-grained. as-solidified microstructure, while the microstructure of heat-affected zone was the recrystallized microstructure with reduction in grain size as distance from the fusion line increased. Microhardness profile using Vickers hardness tester was obtained across the weld region, and the tensile properties of the weld joints were evaluated by performing room temperature tensile test and fracture was examined using scanning electron microscope. Joint coefficient of the weld joints were ~40 to 45 pct of that of the parent metals with nonmeasurable tensile ductility with predominantly transgranular mode of fracture indicating weakness along the grain boundary. Detailed orientation imaging and transmission electron microscopy were carried out to understand the most dominating factor in introducing weld joint brittleness.

Santosh Kumar

Papers

Study on the effect of post weld heat treatment parameters on the relaxation of welding residual stresses in electron beam welded P91 steel plates

Scratch behavior of aluminum anodized in oxalic acid: Effect of anodizing potential

Residual stresses in laser welded ASTM A387 Grade 91 steel plates

Thermo-metallurgical and thermo-mechanical computations for laser welded joint in 9Cr–1Mo(V, Nb) ferritic/martensitic steel

Welding of Mo-Based Alloy Using Electron Beam and Laser-GTAW Hybrid Welding Techniques