In this study, mechanically alloyed Al 2024 powder is densified by conventional sintering and by equal channel angular pressing (ECAP) with and without back pressure. The powder was encapsulated in an aluminium can for consolidation through ECAP. The properties obtained in the compacts by conventional sintering route and by ECAP are compared. The effect of conventional sintering and ECAP on con...

background and aim: experience of love and romantic grief is prevalent in university students. the aim of this study was the study the role of early maladaptive schemas, personality traits and attachment in prediction of love trauma syndrome. materials and methods : for this propose 192 female student from azarbaijan shahid madani university selected by purposive sampling and according inclusio...

Panelists have been selected for the ANS panel at 2024 Modern Language Association Conference to be held from January 4­-7, in Pittsburgh, Pennsylvania. The panel, titled “Diversity, Equity, and Inclusion: Names Naming Literature”, features a range of literary genres diverse cultures time periods includes works written adults youth.

amino acid (aa) content of six meat and bone meal (mbm) samples was determined by ion-exchange chromatography. true aa digestibility of amino acids were determined of using precise sibbald's feeding method. metionin and lucien, with averages of 0.35 and 2.29 percent, had the lowest and highest values among essential aa of mbm samples. average content of individual aa, sum of essential and ...

In this work, nanosized Boron nitride and silicon carbide reinforced ZA - 12 matrix hybrid composites were produced using stir casting technique with of aluminum scrap (AA 2024), pure Al (electrical wires) zinc scraps. Microstructure Observation was revealed by scanning electron microscopy, the analysis showed a uniform distribution (SiC BN) nanoparticles for Zn-Al matrix. Also, an optical micr...

We present results of a sensitive 76 ksec Chandra observation of the young stellar cluster in NGC 2024, lying at a distance of ∼415 pc in the Orion B giant molecular cloud. Previous infrared observations have shown that this remarkable cluster contains several hundred embedded young stars, most of which are still surrounded by circumstellar disks. Thus, it presents a rare opportunity to study X...

In this study, the transitions of land use that occurred in the urban and peripheral areas of Chihuahua City, Mexico, were determined for the period 1989–2014. Landsat TM and OLI scenes, as well as the method of Markov Chains (MC) were used. Grasslands and Shrublands were the land uses that experienced the highest pressures for land use. Grasslands occupied 23.5% of the area in 1989, decreasing...

Aluminum 2024 and 7075 alloys which are widely used in aerospace and marine applications were chosen to investigate their strengthening mechanisms. Using differential thermal analysis (DIA), metallography and tension tests, the best solutionizing conditions were determined to be 500±5°C and 2 hours for 2024 and 480?±5°C and 1 hour for 7075 alloy. Aging was performed in the range of 100 to 200°C...

The material flow and microstructural evolution in the friction stir welds of a 6061-Al alloy to itself and of a 6061-Al alloy to 2024-Al alloy plates of 12.7 mm in thickness were studied under different welding conditions. The results showed that plastic deformation, flow, and mechanical mixing of the material exhibit distinct asymmetry characteristics at both sides of the same and dissimilar ...

In this paper we study the class of square matrices A such that AA − AA is nonsingular, where A stands for the Moore–Penrose inverse of A. Among several characterizations we prove that for a matrix A of order n, the difference AA−AA is nonsingular if and only if R(A) ⊕ R(A) = Cn,1, where R(·) denotes the range space. Also we study matrices A such that R(A) = R(A).