E-glass fiber woven roving reinforced polyurethane composites were manufactured by three different processes: hand lay-up, compression molding and vacuum infusion to assess the feasibility of all the processes. The results showed that all composites led to significant improvements in both flexural and tensile properties except elongation at break in comparison with the neat PU. Among the three processes, the best bending strength was exhibited by the hand lay-up process. This is attributed to higher PU mass fraction leads to a better fiber–matrix interfacial adhesion. Mechanical properties of the composite molded by vacuum infusion were superior to that produced by compression molding process. The SEM morphology revealed that vacuum infusion composite had more homogeneous micro- structure.
Rationale:Primary extra-nodal non-Hodgkin lymphoma (PE-NHL) arising in the region of the buttocks is rare. After reviewing the literature from the last 20 years, we found only 3 reported lymphomas originating from soft tissue of the buttocks. In our case, positron emission tomography/computed tomography (PET/CT) was performed for the first time, both before and after treatment, to determine the initial stage of PE-NHL and the curative effects of treatment.Patient concerns:We report the case of a 71-year-old woman who was admitted to our hospital due to pain, skin redness, rising skin temperature, and swelling in the right hip.Diagnoses:After an initial misdiagnosis of local infection, a histological examination and PET/CT were performed which revealed evidence of non-Hodgkin marginal zone B cell lymphoma of Ann Arbor stage II.Interventions:Following unsuccessful treatment with cephalosporin, the patient was successfully treated with rituximab combined with cyclophosphamide, doxorubicin, vincristine, and prednisone (R-CHOP) chemotherapy.Outcomes:Comparison of the PET/CT scans taken before and after treatment showed that the lesion size had decreased, as had the fluorodeoxyglucose (FDG) uptake seen in the subcutaneous tissue of the right buttock with standardized uptake value max (SUVmax) 11.6 versus 2.5, respectively. Subsequently, no relapse or distant metastasis has been detected.Lessons:Young doctors should suspect PE-NHL in similar cases. PET/CT is valuable in the diagnosis and treatment of PE-NHL, as well as for accurately determining PE-NHL stage and aggressiveness.
A combined process of flocculation and Fenton oxidation was studied for the treatment of polymerization effluents (PME) from the manufacture of dry-spun acrylic fibers. 5 inorganic and 3 organic flocculants were investigated and the optimal regents and conditons were PAC (at 25°C, pH=8 and a dosage of 150 mg/L), and Z7650 (at 25°C, pH=6 and a dosage of 10 mg/L). Under this condition, the COD was removed by 23.1% of the initial 1824 mg/L. The optimum efficiency of Fenton process was determined at 25°C and pH=4 with a reaction time of 90 min. The dosage of H2O2 and the rate of c(H2O2)/c(FeSO4) were respectively 0.53 mol/L and 20:1. Finally, the removal of COD, total nitrogen, ammonia, SO32- and turbidity by the combined process were 64.0%, 99.3%, 99.6%, 99.7% and 89.4% respectively. BOD/COD was also improved from 0.09 to 0.25.
In order to describe petroleum hydrocarbon contaminants (PHCs) transport feature in saturated zone, two-dimensional sandbox was designed to carry out physical simulation experiment, and infiltration, migration and distribution of PHCs in saturated zone were investigated. Meanwhile, MOFAT simulator was selected to carry out numerical simulation research, and simulator accuracy was analyzed by comparing to physical simulation data. Results indicated that MOFAT simulator could simulate and predict PHCs transport behavior in saturated zone.
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