A Method for Acceptance Testing of Ferrite Core Production Lots

A method for screening the Production Lots of ferrite cores to be tested for MTC is required because of testing limitations and large variations found between Production Lots. It is proposed that a sample of 100 cores be taken from each lot and tested at the factory. The mean of the sample must be between the Screening Limits specified for the lot to be accepted, from the manufacturer, for complete testing. The Per Cent Yield of the total number of cores to be tested individually has been calculated as a function of Screening Limits (see Figure l)

An Investigation of Some Parameters which Influence the Magnetic Characteristics of Ferrites

Master's Thesis Proposal: An Investigation of Some Parameters which Influence the Magnetic Characteristics of Ferrites. Recent theories have been advanced concerning the squareness of the hysteresis loop and the dynamics of the magnetic switching mechanism in polycrystalline ferrites. These theories require evaluation. The important parameters of these theories, grain-to-grain alignment of the direction of magnetization, domain-wall energy density, and the saturation moment, will be investigated in this thesis

Magnetostriction in Ferrites Possessing a Square Hysteresis Loop

The development of ceramic materials with an intrinsically square hysteresis loop for use as storage elements in high-speed electronic computers has been largely empirical. A fundamental understanding of the basic mechanism responsible for the square hysteresis loop is necessary for further significant improvements in these materials. The investigation reported in this paper was undertaken to obtain magnetostriction data on a compositional series of ferrites in which there exists an important variation in the character of the hysteresis loop. A significant correlation was found between the magnetostriction and the hysteresis data. The isotropic saturation magnetostriction for these polycrystalline materials was found to change sign, going through zero at the optimum composition for hysteresis-loop squareness in this compositional series. In addition, the sign of the magnetostriction at low fields, which in nearly all cases is opposite to that at high fields, also changes at this optimum composition. These data have been analyzed, and it has been concluded that the effective domain anisotropy and the polycrystalline saturation magnetostriction are zero at the optimum composition. A possible mechanism is advanced which explains the observed data as the result of a grain-to-grain alignment of the magnetic moments due to the anisotropy of the single-crystal magnetostriction. Because it presents information of general interest this thesis report, which has had only very limited distribution, is being issued as a Division 6 Report

Nutrition Controls Mitochondrial Biogenesis in the Drosophila Adipose Tissue through Delg and Cyclin D/Cdk4

Mitochondria are cellular organelles that perform critical metabolic functions: they generate energy from nutrients but also provide metabolites for de novo synthesis of fatty acids and several amino acids. Thus mitochondrial mass and activity must be coordinated with nutrient availability, yet this remains poorly understood. Here, we demonstrate that Drosophila larvae grown in low yeast food have strong defects in mitochondrial abundance and respiration activity in the larval fat body. This correlates with reduced expression of genes encoding mitochondrial proteins, particularly genes involved in oxidative phosphorylation. Second, genes involved in glutamine metabolism are also expressed in a nutrient-dependent manner, suggesting a coordination of amino acid synthesis with mitochondrial abundance and activity. Moreover, we show that Delg (CG6338), the Drosophila homologue to the alpha subunit of mammalian transcription factor NRF-2/GABP, is required for proper expression of most genes encoding mitochondrial proteins. Our data demonstrate that Delg is critical to adjust mitochondrial abundance in respect to Cyclin D/Cdk4, a growth-promoting complex and glutamine metabolism according to nutrient availability. However, in contrast to nutrients, Delg is not involved in the regulation of mitochondrial activity in the fat body. These findings are the first genetic evidence that the regulation of mitochondrial mass can be uncoupled from mitochondrial activity

Towards an ecological network for the Carpathians

The Carpathian Biodiversity Information System (CBIS) and the proposal for an ecological network for the eastern part of the Carpathians are the two main outcomes of the project funded by the BBI Matra program of the Dutch government. This brochure presents information on how the CBIS was designed, and how the data stored can be retrieved and used. It also clarifies how the CBIS data were used to design the ecological network and, last but not least, it offers recommendations for the use of the proposed ecological network in supporting sustainable developmentin the Carpathians. Due to funding restrictions, the project focused on three east Carpathian countries: Romania, Serbia and Ukraine, which together host the largest area of the Carpathians (Fig. 2). Geographically, the Eastern Carpathians also include parts of the Carpathians located in Poland and Slovakia. Data collection in the Western Carpathians (Czech Republic, Poland, Slovakia and Hungary) will be completed by 2010 and is funded by a parallel project

Conference on Ferrimagnetism, 11-12 October, 1954

The eighteen papers which were presented at the conference on ferrimagnetism at the U. S. Naval Ordnance Laboratory, 11-12 October 1954, are summarized. Pertinent discussions are also included

Crossing borders to bind proteins—a new concept in protein recognition based on the conjugation of small organic molecules or short peptides to polypeptides from a designed set

A new concept for protein recognition and binding is highlighted. The conjugation of small organic molecules or short peptides to polypeptides from a designed set provides binder molecules that bind proteins with high affinities, and with selectivities that are equal to those of antibodies. The small organic molecules or peptides need to bind the protein targets but only with modest affinities and selectivities, because conjugation to the polypeptides results in molecules with dramatically improved binder performance. The polypeptides are selected from a set of only sixteen sequences designed to bind, in principle, any protein. The small number of polypeptides used to prepare high-affinity binders contrasts sharply with the huge libraries used in binder technologies based on selection or immunization. Also, unlike antibodies and engineered proteins, the polypeptides have unordered three-dimensional structures and adapt to the proteins to which they bind. Binder molecules for the C-reactive protein, human carbonic anhydrase II, acetylcholine esterase, thymidine kinase 1, phosphorylated proteins, the D-dimer, and a number of antibodies are used as examples to demonstrate that affinities are achieved that are higher than those of the small molecules or peptides by as much as four orders of magnitude. Evaluation by pull-down experiments and ELISA-based tests in human serum show selectivities to be equal to those of antibodies. Small organic molecules and peptides are readily available from pools of endogenous ligands, enzyme substrates, inhibitors or products, from screened small molecule libraries, from phage display, and from mRNA display. The technology is an alternative to established binder concepts for applications in drug development, diagnostics, medical imaging, and protein separation