A B S T R A C TPrecursor was prepared from rice husk under different carbonization temperatures. Then, activated carbon (AC) was synthesized by NaOH activation. The specific surface area of carbon increased with temperature rise up to 600˚C, but decreased rapidly over 600˚C. So, the AC obtained at 600˚C possessed the outstanding surface area of 2,802 m 2 /g. And, its adsorption activity of nitrate was carried out at initial concentration of 50-400 mg/L. The results showed that the maximum adsorption capacity and removal percentage of NO À 3 were 70.2 mg/g and 70.6%, respectively. Besides, the experimental data were evaluated by Langmuir, Freundlich, and Redlich-Peterson isotherms. In kinetic studies, it was observed that the results were well explained by the pseudo second-order model. In addition, the Gibbs free energy change of À17.0 kJ/mol indicated that the adsorption process was spontaneous.

− late has been used successfully for the he− mostatic treatment of bleeding gastric varices [1]. Various complications asso− ciated with the procedure have been re− ported [2]. The prevalence of infectious complications could range from 4.3 % to 50 %, and most are transient and unevent− ful [3]. Because prolonged and persistent septic complications have been rarely re− ported, the appropriate strategy of man−

This research added different ratios of chromium carbides, tantalum carbide, and titanium carbide powders to Vanadis 23 high-speed steel powders. The composite powders utilised vacuum sintering at 1230, 1245, 1260, and 1275°C for 1 h, respectively, and the experimental results show that good mechanical properties were obtained by the addition of 0.6 mass% Cr 3 C 2 -0.2 mass% TaC-0.2 mass% TiC sintered at 1245°C for 1 h. Meanwhile, the apparent porosity was decreased to 0.23%, and the transverse rupture strength and hardness reached 2470.7 MPa and 78.5 HRA, respectively. When optimally sintered Vanadis 23 composites (0.2 T) underwent a series of heat treatments, the transverse rupture strength and hardness values were obviously enhanced to 2693.6 MPa and 84.0 HRA after quenching, and sub-zero and tempering treatments. The EBSD and TEM results confirm that the MC, M 6 C, M 7 C 3 , and M 23 C 6 -type carbides appeared in the 0.2 T specimen after vacuum sintering and sub-zero heat treatments.

Hepatic dysfunction in scrub typhus patients is associated with older age, longer fever duration, and absence of lymphadenopathy. Serum aminotransferase elevation can aid in the diagnosis of scrub typhus, especially in suspected patients without eschar.

The early detection rate of superficial pharyngeal squamous cell carcinoma (SPSCC) by using narrow-band imaging is increasing. Importantly, endoscopic submucosal dissection (ESD) provides promising outcomes by experienced endoscopists. The aims of this study were to clarify the feasibility of ESD for SPSCC and its safety and outcomes. In total, 10 patients with 11 lesions were treated by ESD between January 2015 and June 2019. We assessed tumor size, macroscopic type, endoscopic methods, procedure time, histopathologic results, resection results, local recurrence, and adverse events. En bloc resection rate and complete resection rate are 91% (10/11) and 36% (4/11), respectively. Two patients encountered laryngeal edema and one had subcutaneous emphysema. All the three patients recovered after conservative treatment and discharged uneventfully. There was one patient with local recurrence but all 10 of our patients survived (100%) during follow-up. ESD for superficial pharyngeal cancer is a safe and feasible treatment with satisfactory and promising outcome.