Continuous synthesis of Zn2SiO4:Mn fine particles in supercritical water at temperatures of 400-500 °C and pressures of 30-35 MPa

Sub-micron sized Zn₂SiO₄:Mn²⁺ phosphors particles were continuously synthesized in supercritical water with a flow reactor. Colloidal silica or sodium silicate was used as the Si source. Zn and Mn sources were chosen from their nitrates, sulfates, and acetates. The syntheses were carried out at temperatures from 400 to 500 °C, at pressures from 30 to 35 MPa, at NaOH concentrations from 0.014 to 0.025 M, and for residence times from 0.025 to 0.18 s. Sodium silicate formed α- and β-Zn₂SiO₄:Mn²⁺ phases regardless of the Zn and Mn sources, while colloidal silica formed phases dependent on the type of Zn and Mn sources used in addition to the use of alkali. As the reaction temperature increased, the crystallinity of α-Zn₂SiO₄:Mn²⁺ phase increased and the Mn substitution into the Zn sites of the α-Zn₂SiO₄ phase decreased. Of the conditions studied, the most highly crystalline α-Zn₂SiO₄:Mn²⁺ was produced at a temperature of 400 °C, a pressure of 30 MPa, a NaOH concentration of 0.14 M, and a residence time of 0.13 s with Zn and Mn sulfates and colloidal silica as starting materials. The α-Zn₂SiO₄:Mn²⁺ fine particles synthesized were round in shape, had an average diameter of 268 nm, and exhibited a green-emission with a peak wavelength of 524 nm.     

野外试验场黄土的理化分析

本实验为低,中水平放射性废物浅地层处置安全评价提供现场土壤的物理化学参数。采样深度在０．５－９．１ｍ范围内,每个样品进行１０项测定;矿物组成,粒度分布、密度、总孔隙度、有效孔隙度、给水度、持水度、渗透系数、阳离子交换容量、含水量。     

Multiple pulmonary nodules in association with pyoderma gangrenosum

This report describes a patient with extensive pyoderma gangrenosum in whom there were co-existent lung abnormalities. The patient's X-ray showed peripherally sited multiple pulmonary lesions bilaterally. A lung biopsy showed chronic non-specific inflammatory changes with neutrophil and lymphocyte infiltration which were similar to the skin lesions. This case was diagnosed as multiple aseptic nodules in pyoderma gangrenosum. The pulmonary infiltrative shadows were controlled only with prednisolone treatment. Steroid therapy is considered to be the first choice to control pulmonary lesions of this disease.     

Diffusion of low molecular weight substances into a fiber with skin-core structure—rigorous solution of the diffusion in a coaxial cylinder of multiple components

The diffusion equation of low molecular weight substances (penetrant) into a coaxial cylinder of multiple components (m) was formulated in general and solved rigorously. As the simplest but a practical case of m = 2, which corresponds to the diffusion of penetrant into fibrous material with skin and core structure, the diffusion of penetrant was analyzed in detail. That is, changes in the penetrant concentration distribution within the coaxial dual cylinder of skin and core components and the total amount of penetrant sorbed within the cylinder both with time after exposing the cylinder to atmosphere of fixed penetrant concentration of C_out were calculated with variation of the diffusion coefficient ratio (D₁/D₂) and the radius ratio (R₂/R₁), where D₁ and D₂ are the diffusion coefficients of penetrant in the core and the skin, and R₂ and R₁ are the radii of the fibrous material and the core, respectively. Keeping (R₂/R₁) at a constant value of 1.2 but varying (D₁/D₂) from 10⁴ to 10^?2, the penetrant concentration distribution was calculated and found to be much different particularly within the core between (D₁/D₂) > 1 and (D₁/D₂) < 1. The sorption curves were also found to deviate in their respective ways from that of Fickian curve of a homogeneous cylinder with (D₁/D₂) = 1 except at initial stage of sorption. Further, by keeping (D₁/D₂) constant but varying (R₂/R₁) from 1.1 to 1.5, the effects of relative skin thickness upon the sorption curve were studied.     

Impact of androgen deprivation prior to radical prostatectomy for T1, T2 prostate cancer on the likelihood of curative surgery

BACKGROUND: Extracapsular extension is commonly seen in patients undergoing radical prostatectomy for localized prostate cancer due to understaging of disease. One possible approach to reduce the likelihood of extracapsular disease is androgen deprivation prior to radical prostatectomy, neoadjuvant therapy. However, adequate application is not clear. We analyzed the outcome of neoadjuvant therapy and radical prostatectomy in an attempt to expand our understanding on indications of neoadjuvant therapy. METHODS: Forty-six selected patients with clinical T1 or T2 prostate cancer were retrospectively reviewed. Twenty-two patients underwent neoadjuvant therapy (group N) that mainly consists of LH-RH agonist. The duration of neoadjuvant therapy, varied from 1 to 12 months with the mean being 4 months. Twenty-four underwent radical prostatectomy alone (group S). RESULTS: In the group N and group S, 59% and 33% had either organ confined disease (OCD) or specimen confined disease (SCD) respectively. When the patients had OCD or SCD, they were defined as surgically cured patients. In the patients with clinical stage T1b, T1c, and T2 disease, likelihood of surgical cure were 100%, 50%, 46.7% in group N, 100%, 20%, 11%, in group S respectively. In the patients with initial serum PSA less than 10 ng/ml and more than 10.1 ng/ml, likelihood of surgical cure were 83.3% and 50% in group N, 63.6% and 15.4% in group S, respectively. Likelihood of surgical cure was higher in the patients with well differentiated carcinoma both in group N and group S. All the patients with serum PSA less than 0.1 ng/ml after neoadjuvant therapy had OCD. CONCLUSION: Neoadjuvent therapy could be beneficial either in the patients with moderately or in the poorly differentiated adenocarcinoma of prostate especially in the group with initial serum PSA more than 10.1 ng/ml. However, in patients both with well differentiated adenocarcinoma and the initial serum PSA less than 10 ng/ml, no evidence of beneficial effect on the likelihood of OCD or SCD was observed. PSA after neoadjuvant therapy could be useful predictor for the pathological outcome.     

Orientation dependence of β1 → β 1 1 stress-induced martensitic transformation in a Cu-Al-Ni alloystress-induced martensitic transformation in a Cu-Al-Ni alloy

The online version of the original article can be found at     

Preparation of high-modulus and high-strength poly(ethylene terephthalate) film by zone-annealing method

The zone-annealing method was attempted to prepare high-modulus and high-strength poly(ethylene terephthalate) (PET) film. The film having Young′s modulus of 14.5 × 10¹⁰ dyn/cm² and a tensile strength of 86.9 kg/mm² in the drawing direction was obtained. These values correspond to four times those of a biaxial-stretched PET film available commercially. The dyanmic viscoelastic properties also were measured. The dynamic storage modulus was 15.4 × 10¹⁰ dyn/cm² at room temperature, and a high value of 3.6 × 10¹⁰ dyn/cm² even at 200°C. The latter value is slightly higher than the room temperature modulus of the commercially available film. From the intensity and temperature position of α-dispersion E″ peak, it was suggested that the amorphous chains in the zone-annealed film was densely packed in a highly oriented state. Furthermore, the crystallinity, orientation, especially double orientation, and molecular chain conformation of the films in the zone-annealing process are discussed in the present paper.     

A case report of well differentiated fetal adenocarcinoma]

A 32-year-old female, who was admitted with complaints of cough and an abnormal shadow in the left lower lobe, was diagnosed as adenocarcinoma of the lung by TBLB. She underwent left lower lobectomy and lymph node dissection. Histopathological findings showed well differentiated fetal adenocarcinoma (WDFA). Well differentiated fetal adenocarcinomas are considered to have a histogenesis similar to that of pulmonary blastoma and may be a tumor with one-sided development of pulmonary blastoma showing only an epithelial component.     

Morphology and orientation of MoS2 clusters on Al2O3 and TiO2 supports and their effect on catalytic performance

The catalytic performance of MoS₂-based hydrotreating catalysts strongly depends on their morphology and orientation on the support. The effects of the morphology and orientation of MoS₂ clusters on supports, typically Al₂O₃ and TiO₂, on the catalytic performance are reviewed here, focusing on recently reported epitaxial relationships at the interface between MoS₂ clusters and the support.