Nuclear Ground State Observables and QCD Scaling in a Refined Relativistic Point Coupling Model

We present results obtained in the calculation of nuclear ground state properties in relativistic Hartree approximation using a Lagrangian whose QCD-scaled coupling constants are all natural (dimensionless and of order 1). Our model consists of four-, six-, and eight-fermion point couplings (contact interactions) together with derivative terms representing, respectively, two-, three-, and four-body forces and the finite ranges of the corresponding mesonic interactions. The coupling constants have been determined in a self-consistent procedure that solves the model equations for representative nuclei simultaneously in a generalized nonlinear least-squares adjustment algorithm. The extracted coupling constants allow us to predict ground state properties of a much larger set of even-even nuclei to good accuracy. The fact that the extracted coupling constants are all natural leads to the conclusion that QCD scaling and chiral symmetry apply to finite nuclei.Comment: 44 pages, 13 figures, 9 tables, REVTEX, accepted for publication in Phys. Rev.

Microwave characterization of high-temperature superconductors

Thick (10-15 {mu}m) Tl-Ba-Ca-Cu-O films have been deposited onto yttria-stabilized zirconia and Ag substrates by d.c. magnetron sputtering techniques. Direct deposition onto 1'' diameter yttria-stabilized zirconia yields films with typical 22 GHz surface resistance (R{sub s}) values of 5.2 {plus minus} 2 m{Omega} and 52 {plus minus} 2 m{Omega} at 10 K and 77 K, respectively. For comparison, R{sub s} of Cu at this same frequency is 10 m{Omega} at 4 K and 22 m{Omega} at 77 K. Tl-Ba-Ca-Cu-O films have also been deposited onto 1'' diameter Ag substrates using Au/Cu, Cu, and BaF{sub 2} buffer layers. The lowest R{sub s} values were obtained on films with a BaF{sub 2} buffer layer, typical values being 7.8 {plus minus} 2 m{Omega} and 30.6 {plus minus} 2 m{Omega} (measured at 22 GHz) at 10 K and 77 K, respectively. Larger films (1.5'' diameter) with similar R{sub s} values were prepared using this same technique, demonstrating that the fabrication process can be scaled to larger surface areas. These films are promising for radiofrequency cavity applications because they are thick (50-75 times the London penetration depth), have relatively large surface areas, are fabricated on metallic substrates, and have R{sub s} values that are competitive with Cu at 77 K and are lower than Cu at 4 K. Because they are polycrystalline and unoriented, it is anticipated that their R{sub s} values can be lowered by improving the processing technique. High-quality films of YBa{sub 2}Cu{sub 3}O{sub 7} have been electron-beam deposited onto 1'' LaGaO{sub 3} and 1.5'' LaAlO{sub 3} substrates. The 1'' sample is characterized by R{sub s} values of 0.2 {plus minus} 0.1 m{Omega} at 4 K and 18.6 {plus minus} 2 m{Omega} at 77 K. The 4-K value is only 2-4 times higher than Nb. The 1.5'' sample has R{sub s} values (measured at 18 GHz) of 0.93 {plus minus} 2 m{Omega} and 71 {plus minus} 3 m{Omega} at 10 K and 77 K, respectively. 18 refs., 8 figs

Thrombotic thrombocytopenic purpura (Moschcowitz disease): Literature review and clinical observation of the disease in a 7-year-old child

Thrombotic thrombocytopenic purpura (TTP) is a rare clinical form of thrombotic microangiopathy (TMA) characterized by a triad of symptoms including non-immune hemolytic anemia, thrombocytopenia and polyorganic disorders (kidneys, central nervous system, lung, heart, gastrointestinal tract). Vital organs functions disorder caused by microthrombosis and tissue ischemia. This is the only form of TMA that has 100% laboratory confirmation. The cause of TTP is the absolute deficit or decrease in ADAMTS13 metalloprotease activity, which lead to an increase of concentration in blood stream of ultra-large von Willebrand factor multimers with high adhesive and aggregation activity. ADAMTS13 level less than 10% indicates a pronounced deficiency of metalloprotease, which predetermines severe thrombotic complications development. TTP diagnostics is based on the algorithm for detecting and confirming TMA symptom complex and excluding other variants of primary and secondary TMA, which are typical and atypical hemolyticuremic syndrome and a variety of secondary TMA. The article presents a clinical observation of TTP in a 7-year-old boy. The child entered the hospital for emergency indications with complaints of body temperature in crease to 40,7 0C, headache, wet cough, jaundice, petechial elements on the skin, urine darkening. General blood test revealed severe anemia (Hb 46 g/L), absence of platelets; ADAMTS13 level was 4%. The clinical picture represented by symptom complex of polyorganic disorders, including, besides the typical kidney and brain lesions, lung and eye lesions; laboratory data allowed to diagnose TTP. The patient underwent pathogenetic therapy followed by TTP remission, but severe ischemic nephron damage with clinical laboratory complex of complete nephrotic syndrome for 8 months from the TTP's debut has no complete laboratory remission. The article presents new data on disease pathogenesis, diagnostics and treatment of TTP. © 2017, Pediatria Ltd. All Rights Reserved

Thrombotic thrombocytopenic purpura (Moschcowitz disease): Literature review and clinical observation of the disease in a 7-year-old child

Thrombotic thrombocytopenic purpura (TTP) is a rare clinical form of thrombotic microangiopathy (TMA) characterized by a triad of symptoms including non-immune hemolytic anemia, thrombocytopenia and polyorganic disorders (kidneys, central nervous system, lung, heart, gastrointestinal tract). Vital organs functions disorder caused by microthrombosis and tissue ischemia. This is the only form of TMA that has 100% laboratory confirmation. The cause of TTP is the absolute deficit or decrease in ADAMTS13 metalloprotease activity, which lead to an increase of concentration in blood stream of ultra-large von Willebrand factor multimers with high adhesive and aggregation activity. ADAMTS13 level less than 10% indicates a pronounced deficiency of metalloprotease, which predetermines severe thrombotic complications development. TTP diagnostics is based on the algorithm for detecting and confirming TMA symptom complex and excluding other variants of primary and secondary TMA, which are typical and atypical hemolyticuremic syndrome and a variety of secondary TMA. The article presents a clinical observation of TTP in a 7-year-old boy. The child entered the hospital for emergency indications with complaints of body temperature in crease to 40,7 0C, headache, wet cough, jaundice, petechial elements on the skin, urine darkening. General blood test revealed severe anemia (Hb 46 g/L), absence of platelets; ADAMTS13 level was 4%. The clinical picture represented by symptom complex of polyorganic disorders, including, besides the typical kidney and brain lesions, lung and eye lesions; laboratory data allowed to diagnose TTP. The patient underwent pathogenetic therapy followed by TTP remission, but severe ischemic nephron damage with clinical laboratory complex of complete nephrotic syndrome for 8 months from the TTP's debut has no complete laboratory remission. The article presents new data on disease pathogenesis, diagnostics and treatment of TTP. © 2017, Pediatria Ltd. All Rights Reserved