نتایج جستجو برای: l21
تعداد نتایج: 424 فیلتر نتایج به سال:
در این تحقیق آلیاژ حافظه پذیر فرومغناطیسni50mn34in16 با استفاده از روش آلیاژسازی مکانیکی ساخته شد. بررسی الگوی پراش پرتوی ایکس نمونه ها نشان داد که ساختار ترکیب در پایان ساعت دهم آسیاب کاری به طور کامل شکل گرفته و ادامه آسیاب کاری موجب ریزتر شدن اندازه دانه ها می شود. همچنین نقش بازپخت در بهبود ویژگی های آلیاژ مطالعه شد و مشخص شد که با بازپخت نمونه در دمای c°900 و سردسازی سریع آن می توان به ترک...
The synthesis temperature dependent phase formation of Ni10Ti10Al25Fe35Cr20 thin films is compared to a bulk processed sample identical composition. as-cast alloy exhibits dual-phase microstructure which composed disordered BCC and AlNiTi-based B2- and/or L21-ordered phase(s). Formation the as well an ordered AlNi-based B2 observed for film synthesised at 500 °C (ratio melting alloy: T/Tm = 0.4...
We used the Taylor–Ulitovsky technique to prepare nanocrystalline Co2MnGe Heusler alloy glass-coated microwires with a metallic nucleus diameter of 18 ± 0.1 µm and total 27.2 µm. Magnetic structural studies were carried out determine fundamental magneto-structural characteristics microwires. XRD revealed well-defined structure an average grain size about 63 nm, lattice parameter = 5.62 unique m...
PURPOSE To identify lens epithelial genes with altered expression levels in age-related human cataract. METHODS Epithelia from age-related cataracts and from normal lenses were microdissected and RNA was extracted. RNAs were compared for gene expression differences by RT-PCR differential display. Transcripts exhibiting altered levels of gene expression were cloned and identified by sequencing...
A method for the determination of 24 organochlorine pesticides by gas chromatography-mass spectrometry (GC-MS) with negative-ion chemical-ionization (NICI) using programmable temperature vaporizer (PTV)-based large volume injection (LVI) is described. The ion source temperature was determined to be 150 °C for the optimized NICI-selected ion monitoring (SIM) conditions. PTV inlet parameters were...
We have investigated the protein-protein cross-links formed within the 50 S subunit of the Escherichia coli ribosome using 2-iminothiolane as the cross-linking reagent. The members of the cross-links have been identified by immunoblotting from one-dimensional and two-dimensional diagonal sodium dodecyl sulfate-polyacrylamide gels using antisera specific for the individual ribosomal proteins. Th...
I study the optimal regulation of a rm producing two goods. The rm has private information about its cost of producing either of the goods. I explore the ways in which the optimal allocation di¤ers from its one dimensional counterpart. With binding constraints in both dimensions, the allocation involves distortions for the most e¢ cient producers and features overproduction for some less e¢ c...
Rainwater hydrophobic extractable dissolved organic matter (EDOM) contains ligand(s) that completely prevent Fe(II) oxidation for at least 4 h after rain is mixed with seawater. The EDOM Fe(II) complex is at least of comparable strength to the ferrozine complex, indicating that this rainwater Fe(II) ligand is among the strongest Fe(II) ligands ever observed in natural waters. In addition to the...
The structure and nanoscale mechanical properties of Ni48.8Mn27.2Ga24 thin film fabricated by DC magnetron sputtering are investigated systematically. The thin film has the austenite state at room temperature with the L21 Hesuler structure. During nanoindentation, stress-induced martensitic transformation occurs on the nanoscale for the film annealed at 823 K for 1 hour and the shape recovery r...
The distribution of chloroplast ribosomal protein genes between the organelle DNA and the nuclear DNA is highly conserved in land plants, but a notable exception is rpl21. This gene has been found in the completely sequenced chloroplast genome of a lower plant but not in that of two higher plants. We describe the purification and characterization of the spinach chloroplast ribosomal protein L21...
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