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Improvement of electrochemical performance of NaCrO2 by removing electrochemically inert sodium ions
Chang Su,Guo-Qiang Liu,Yixuan Zhang,Danlei Qiao 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.120 No.-
In this study, we used ultrasonic treatment and ethanol cleaning (UE treatment) to remove a smallamount of electrochemically inert Na+ ions from the surface lattice of NaCrO2 to obtain a modified materialNaCrO2-UE. Its electrochemical properties were significantly improved. At a rate of 10C, the initialdischarge capacity of NaCrO2-UE was 115.8 mAh/g, and the retention rate was 87.0 % after 500 cycles. Moreover, at a higher rate of 40C, it could deliver a discharge capacity of 111.4 mAh/g. In addition, thedischarge voltage plateau of NaCrO2-UE reached 2.91 V, while the discharge voltage plateau of pristineNaCrO2 was 2.78 V.
김창수 ( Kim¸ Chang-su ),이한나 ( Lee¸ Han-na ),김효진 ( Kim¸ Hyo-jin ),서상영 ( Seo¸ Sang-young ),조종현 ( Jo¸ Jong-hyun ),이은숙 ( Lee¸ Eun-suk ),안민실 ( Ahn¸ Min Sil ),김희준 ( Kim¸ Hee-jun ) 한국유기농업학회 2021 韓國有機農業學會誌 Vol.29 No.4
This study was conducted to evaluate the control efficacy of the organic farming materials (OFMs) on tuber rot of Gastrodia elata caused by Fusarium spp. The antifungal activities in vitro as well as the suppressive effect of 15 OFMs on the spore germination and germ tube growth by inoculating spore suspension on immature tubers in vivo were investigated. 7 OFMs inhibited the mycelial growth of Fusarium spp. and 7 of them were microbial agents. In the screening using immature tubers, 3 OFMs were very effective with control efficacy value of 70%. Among them, sulfur provided suppressive effect on both mycelial growth and spore germination against tuber rot of G. elata. Finally, 3 OFMs were selected to test the protective and curative effects, and all chosen OFMs significantly suppressed disease incidence when applied in the preventive action, in comparison with the curative action. Especially, sulfur and Bacillus subtilis gave excellent protective control efficacy with control values of 93.2% and 86.9%, respectively, whereas its curative control effect was relatively low (73.3%, 60.2%). On the other hand, the preventive and curative effects of citronella + paraffin oil + ethyl alcohol were 73.3% and 67.0%, respectively. This study suggests that tuber rot of G. elata can be controlled by some OFMs in the rain shelter greenhouse under continuous cultivation condition and protective treatment is more important and efficient.
Changsu Han,Sheng Min Wang,Won-Myong Bahk,Soo-Jung Lee,Ashwin A Patkar,Prakash S Masand,Chi Un Pae 대한정신약물학회 2019 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.17 No.4
Objective: The present study aimed to observe potential benefit of aripiprazole augmentation in the treatment of major depressive disorder with mixed specifier (MDDM) in naturalistic treatment setting. Methods: Data were collected from MDDM patients using a retrospective chart review for 8 weeks (week −8 and week 0) in routine practice. All patients were on current antidepressants upon starting of aripiprazole. Patients were treated without restriction of doses of aripiprazole. The primary endpoint was the mean change of Montgomery−Åsberg Depression Rating Scale (MADRS) total scores along with various secondary endpoint measures. Results: In total 38 patients were analyzed. The changes of MADRS, Clinical Global Impression (CGI)-severity, Young Mania Rating Scale, Sheehan Disability Scale, and CGI-clinical benefit total scores from baseline to the endpoint were −7.1, −0.8, −4.9, −4.1, and −3.6, respectively (all p < 0.0001). At the endpoint, the responder and remitter rates by MADRS score criteria were approximately 32% and 21%, respectively. Conclusion: The present findings have clearly shown the effectiveness and tolerability of aripiprazole augmentation for MDDM patients in routine practice. The present study warrants subsequent, adequately-powered, well-controlled studies for generalizability near future.
Is Surgical Treatment Necessary for the Treatment of a Jones Fracture?: A Retrospective Study
Changsu Kim,Dong Young Shin,Jiyoun Kim 대한정형외과학회 2024 Clinics in Orthopedic Surgery Vol.16 No.2
Background: Jones fractures are common injuries that can be treated conservatively or surgically. However, the optimal treatment approach remains controversial. This study aimed to compare the clinical outcomes of conservative and operative treatments for Jones fractures and determine whether surgical treatment is necessary. Methods: A retrospective study was conducted on 69 patients with Jones fractures treated at our hospital. The patients were divided into 2 groups: conservative (C group; n = 46) and operative (O group; n = 23) treatments. Patients were followed up after 2, 6, and 12 weeks, and every 3 months thereafter. However, outpatient follow-ups were conducted between 8 and 10 weeks as needed. The mean follow-up period was 14.5 weeks (range, 12–24 weeks). In group C, the patients were treated with a non-weightbearing cast for 4–6 weeks, followed by additional weight-bearing boot immobilization before returning to exercise. In group O, patients were treated surgically using a bicortical screw or intramedullary internal fixation. Time to radiologic union, clinical union, return to sports, visual analog scale (VAS), Foot Function Index-Revised Short Form (FFI-RS), and American Orthopedic Foot and Ankle Society (AOFAS) scores were evaluated. Results: Sixty-nine patients were included in the analysis. There were statistically significant differences in the time to radiologic union and return to sports, VAS score in the second week, and FFI-RS score in the 12th week. In group C, favorable outcomes were observed in terms of the time to return to sports, VAS score in the second week, and FFI-RS score in the 12th week. Contrastingly, in group O, better results were observed in time to radiologic union. The AOFAS score was excellent at the final follow-up, with no significant differences between groups. Complication rates were 10.8% and 13% in groups C and O, respectively. Conclusions: Surgical treatment is sometimes necessary for Jones fractures, but conservative treatment should also be considered because of the favorable outcomes. Conservative treatment can be a good option for patients who are risk-averse and place a high value on fracture healing without surgery.
Changsu Shim,Chandara Koem,HyunHae Song,Seong Jun Park 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.2
Post-tensioned precast concrete columns have advantage of re-centering capability for lateral movement by earthquakes. In this paper, cyclic tests were conducted for repaired and strengthened precast columns with severe damage by large lateral movement. Removing the damaged cover concrete and thickening by high performance fiber reinforced cementitious composite (HFRCC) was adopted. The jacket section had additional details of chemical anchors into the foundation and additional transverse reinforcing bars in the thickened concrete. The repair and strengthening increased the flexural strength and stiffness of prestressed precast concrete columns. The flexural strength of the repaired columns with additional chemical anchors was improved by more than 30%. When the shear failure of the jackets was prevented by adding transverse reinforcement, the repaired column showed stable flexural behavior at maximum load and thus enhances displacement ductility. Thickened jacket sections remarkably increased energy dissipation capacity through cracking and interface failure.