The 0.9Pb(ZrxTi1−x)O3-0.07Pb(Mn1/3Nb2/3)O3-0.03Pb(Sb1/2Nb1/2)O3(PZT-PMnN-PSN) ceramics were prepared by columbite method. The phase structure of the ceramic samples was analyzed. Results show that the pure perovskite phase is in all ceramics specimens. The effect of the Zr/Ti ratio on the region of morphotropic phase boundary for PZT-PMnN-PSN ceramics was studied. Experimental results show that the phase structure of ceramics changes from tetragonal to rhombohedral with the increase of the content of Zr/Ti ratio in the system. The composition of PZT-PMnN-PSN ceramics near the morphotropic phase boundary obtained is the ratio of Zr/Ti: 49/51. At this ratio, the ceramic has the optimal electromechanical properties: thekp=0.61, theεmax=29520, thed31=-236 pC/N, theQm=2400, high remanent polarization (Pr=49.2 μC·cm−2), and low coercive fieldEc=10.28 kV·cm−1.
The synthesis, characterization and application of biologically synthesized nanomaterials have become an important branch of nanotechnology. In the present study, we report the synthesis of silver nanoparticles from fresh leaf extract of Centella asiatica (LEC). UV-Vis spectrum for silver colloids contains a strong plasmon band near 425[Formula: see text]nm, which confirms the formation of nanoparticles. The experimental results show that the silver nanoparticles are formed easily in the extract at ambient temperature. The resulting silver nanoparticles (AgNPs) were in the spherical form and the average size of the nanoparticles was in the range from 3[Formula: see text]nm to 30[Formula: see text]nm. From the above silver nanoparticles, we were taken up to investigate the effects of various concentrations of AgNPs on growth, development and yield of peanut plants. The results of the present experiment showed that the optimized concentration of AgNPs of the good germination, growth and pod yield of peanut plant is 5[Formula: see text]ppm.
Splenic artery aneurysm and splenic artery pseudoaneurysm are rare vascular pathologies. The splenic artery represents the third most common site for intra-abdominal aneurysms. In contrast with true splenic artery aneurysm, splenic artery pseudoaneurysm is typically symptomatic, presenting with a range of symptoms, from abdominal pain to hemodynamic instability due to rupture. However, gastrointestinal hemorrhage is an uncommon complication of splenic artery pseudoaneurysm. We report a case of acute upper gastrointestinal hemorrhage due to splenic artery pseudoaneurysm rupture. The patient was successfully treated by endovascular intervention.
Budd–Chiari syndrome (BCS), a rare and life-threatening disorder due to hepatic venous outflow obstruction, is occasionally associated with hypoproteinemia. We herein report the first case of BCS with segmental obstruction of the intrahepatic portion of inferior vena cava (IVC) and hepatic veins (HVs) successfully treated by endovascular stenting in Vietnam. A 32-year-old female patient presented with a 2-month history of massive ascites and leg swelling. She refused history of oral contraceptives use. Hepatosplenomegaly without tenderness was noted. Laboratory data showed polycythemia, mild hypoalbuminemia and hypoproteinemia, slightly high total bilirubin and normal transaminase level. The serum ascites albumin gradient was 1.9 g/dL and ascitic protein level was 1.1 g/dL. The other data were normal. BCS was suspected because of the discrepancy between mild liver failure and massive ascites; and the presence of hepatosplenomegaly and polycythemia. On abdominal magnetic resonance imaging, the segmental obstruction of three HVs and IVC was 2-3 cm long without thrombus. Cavogram revealed the severe segmental stenosis of intrahepatic portion of IVC with no visualized HV and extensive collateral veins. A Protégé stent was deployed to IVC. Leg swelling and ascites were completely resolved within 3 days after stenting. During 1-year follow-up, edema was not recurred and repeated laboratory results were all normal.
The rhombohedral perovskite composite 0.9Pb(Zr0.5Ti0.5)O3-xPb(Mn 1/3 Nb 2/3)O3-(0.1-x)Pb(Sb 1/2 Nb 1/2)O3, x = 0.05; 0.06; 0.07; 0.08; 0.09; 0.1 (PZT-PMnN-PSbN) was synthesized by the Columbite precursor route. The temperature dependence of dielectric constant and its loss in a frequency region of 0.1 kHz-500 kHz was measured in aim to search the weakfield dielectric response in PZT-PMnN-PSbN systems. A highest value of εmax ¿ 20000 was found at 1 kHz with the temperature Tm of around 575K. Using an extended Curie-Weiss law the diffuse phase transition was determined. Fitting by using Vogel-Fulcher and power relationship indicated that the polarization fluctuation above the static freezing temperature behaved like as a spin-glass one. Cole-Cole analyses showed the non-Debye type relaxation in the system studied.
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