Syndromes and arthritis

There are many questions and no clear answers raised by these children. These syndromes, however, seem to be biologic experiments of nature and present unique opportunities to study the various elements involved in the pathogenesis of arthritis. Pediatric rheumatologists are in a unique position to study these syndromes.     

Vasculitis in children

A group of experts from gastroenterology, internal medicine, health economics, medical outcomes, and managed care met in San Francisco, Calif, on September 27, 1994, in an effort to develop clinically and economically effective disease management guidelines to assist physicians in their treatment of gastroesophageal reflux disease in a managed care environment. This article represents a consensus opinion based on the evidence and expert interpretation at the time of that meeting.     

Using the phase-field crystal method in the multi-scale modeling of microstructure evolution

The phase-field-crystal method is a new modeling technique that incorporates the periodic nature of a crystal lattice by considering a free energy functional that is minimized by periodic density fields. This simple approach naturally incorporates elastic and plastic deformations and multiple crystal orientations and can be used to study a host of important material processing phenomena, including grain growth, dendritic and eutectic solidification, and epitaxial growth. This paper reviews the phase-field-crystal formalism and its use in modeling of microstructure evolution in pure and binary alloy systems.     

1.5 V resistive fuse for image smoothing and segmentation

A 1.5 V resistive fuse for image smoothing and segmentation using bulk-driven MOSFETs is presented. The circuit switches on only if the differential voltage applied across its input terminals is less than a set voltage; it switches off if the differential voltage is higher than the set value. The useful operation range of the circuit is 0.4 V with a supply voltage of 1.5 V and threshold voltages of V_Tn=0.828 V and V_Tp=-0.56 V for n and p channel MOSFETs, respectively     

A Comprehensive Study on Texture Development and Twin-Related Domain Evolution Following Hot Compression in a Super Austenitic Stainless Steel

Metallurgical and Materials Transactions A - Uniaxial hot deformation was carried out in a wide range of temperatures (1173 K to 1423 K) and strain rates (0.001 to...     

Juvenile rheumatoid arthritis-like polyarthritis in chromosome 22q11.2 deletion syndrome (DiGeorge anomalad/velocardiofacial syndrome/conotruncal anomaly face syndrome)

OBJECTIVE: To investigate the association of polyarthritis and chromosome 22q11.2 deletions. METHODS: Eighty patients with chromosome 22q11.2 deletion syndrome followed up at The Children's Hospital of Philadelphia were examined for evidence of arthropathy or arthritis. Patients with chromosome 22q11.2 deletion syndrome and polyarthritis underwent laboratory evaluations of immunologic function to determine the relationship of their immunodeficiency to the polyarthritis. RESULTS: The prevalence of polyarthritis in patients with chromosome 22q11.2 deletion syndrome was markedly increased over the prevalence of polyarticular juvenile rheumatoid arthritis (JRA) in the general population. All 3 patients with polyarthritis had evidence of impaired T cell function. Two of the patients with polyarthritis also had IgA deficiency. CONCLUSION: The chromosome 22q11.2 deletion syndrome represents a primary T cell disorder which can be associated with a JRA-like polyarthritis. All 3 patients with polyarthritis had evidence of more extensive immunoregulatory derangements than those typically seen in patients with chromosome 22q11.2 deletion, and these derangements may have predisposed to the development of polyarthritis.     

Function space valued Markov model for electric arc furnace

In this paper, a novel approach for using a function space Markov chain-like to model a nonlinear, highly time-varying load such as an electric arc furnace (EAF) is proposed. After identifying the state space, this approach generalizes the original state case (where state is an element being analyzed) to a function case (in which one analyzes the cycle-vector as an element) and uses the same fundamental idea of Markov-like modeling, thus making it more convenient and powerful for EAF current/voltage prediction in a distribution system. Several approximations for the cycle-vector are investigated to reduce the complexity of the formulation and the burden on computation. The predictions derived from fast Fourier transform (FFT) frequency decomposition method appear to give better results than other proposed approximations based on both accuracy and efficiency indexes. Such an approach is further extended for harmonic compensation with an active harmonic filter (AHF) in a distributed system.     

Microstructure,thermomechanical properties,and electrical conductivity of carbon black‐filled nylon‐12 nanocomposites prepared by selective laser sintering

Selective laser sintering (SLS) is employed to fabricate a multifunctional polymer nanocomposite comprising Nylon‐12 reinforced with carbon black (CB) at a loading of 4% by weight. The heat distortion temperature (HDT), viscoelastic properties, and the electrical conductivity of this nanocomposite are compared to those obtained via extrusion injection molding (Ex‐IM). The HDT of the nanocomposites made by the two methods are found to be nearly identical. The electrical conductivity of the nanocomposite made by SLS is five orders of magnitude higher than that obtained through Ex‐IM. The storage modulus of the SLS‐processed nanocomposite is at least one order of magnitude higher than that of the nanocomposite made by Ex‐IM, for all the frequencies tested. The observed differences in properties and the effects of the processing methods on the polymer's molecular weight, its crystallization characteristics, and the dispersion of CB within the polymer matrix are investigated using X‐ray diffraction, differential scanning calorimetry, and scanning electron microscopy. POLYM. ENG. SCI., 2012. © 2011 Society of Plastics Engineers