[en] Harmonics of the ripple have been investigated experimentally at a self-made model Cockcroft-Walton (C-W) voltage multiplier, as a function of the circuit asymmetry and load. The results showed that the odd harmonics of the ripple was due to the circuit asymmetry and the even harmonics due to the charge-discharge process of capacitors. Under a light load condition, the fundamental harmonics was dominant compared with other harmonics, which could be considered to be the alternating ripple caused by the circuit asymmetry in the linear circuit approximation. When the circuit was asymmetrical, asymmetry of the diode conduction could increase the odd harmonics of the ripple

[en] The Arbitrary Lagrangian and Eulerian Method (ALE), hybrid with the advantages of Lagrangian method and Eulerian method, becomes an efficient computational method in nonlinear continuum mechanics. The conservation equations are simply analyzed in ALE description, and they are solved with an operator split method. The rezoning of the meshes is achieved by using the Equipotential Smoothing method, and the advection of the physical variables is calculated with Donor Cell plus HIS method. The underground explosion is simulated with the author's code, and the results show a good efficiency and credibility of the method. (authors)

[en] Rhodamine B (RhB) and rhodamine 6G (Rh6G) were employed as catalysts for the synthesis of cyclic carbonate from carbon dioxide and epoxide. It turned out that the catalytic activity of Rh6G was nearly 29 times higher than that of RhB at 1 atm pressure, 90 .deg. C. Furthermore, the catalytic efficiency of RhB and Rh6G was greatly enhanced with triethylamine as co-catalyst. Under the optimized conditions, the best isolated yield (93%) of cyclic carbonate was achieved without organic solvent and metal component

[en] A significant improvement of the chemical yields (up to 88%), stereoselectivity (> 99:1) and enantiomeric excesses (up to 98%) of (L)-proline catalyzed direct asymmetric aldol reaction was found when proline based chiral ionic liquids (CILs) were added as additives. Different ratios of DMSO/H₂O as solvent and chiral ionic liquids (CILs) with chiral cations of different chain length were investigated. (author)

[en] Objective: To evaluated the clinical value of interventional treatment in uterine carcinoma. Methods: 48 cases of uterine carcinoma (including 35 carcinoma of cervix and 13 carcinoma of endometrium) were treated with interventional management through uterine artery. Operation was performed after interventional treatment in 21 cases. Results: 21 cases of combined intervention and operation therapies, the 1-year and 3-year survival rates were 100% and 90.5% (19/21) respectively. 27 cases of intervention therapy alone, the 1-year and 3-year survival rates were 100% and 88.9% (24/77), respectively. No complication occurred. Conclusions: The technique is effective in treating advanced uterine carcinoma. It improves condition for further operation and promotes the survival rate

[en] We report a 69-year-old female with nearly 4 months of bilateral lower limb weakness and about 1 week of limited activity and pain. MRI of the thoracolumbar spine revealed that the lesion was mainly on the vertebral body and the corresponding intraspinal, epidural, and paravertebral soft tissues. In the Gd-enhanced images, the lesion was highly apparent and was diagnosed as a malignant tumor. However, the punctate bone density was increased upon PET/CT and ¹⁸F-FDG uptake was low. Furthermore, PET/CT imaging showed a cavernous hemangioma, and this was confirmed by histological examination of the tumor. The understanding of the cavernous hemangioma was deepened by literature review. A cavernous hemangioma can involve the vertebral body and vertebral appendages, and can even extend into the spinal canal and surrounding tissues. Cavernous hemangioma is a benign vascular malformation. The Gd-enhanced imaging is a valuable enhancement tool. Moreover, PET showed low ¹⁸F-FDG uptake. When the MRI lesions are widespread and obvious, malignancy should not be ruled out. Furthermore, PET/CT should be used for the differential diagnosis of benign lesions, such as cavernous hemangioma. (authors)

[en] MoS₂/RGO heterojunction composite was fabricated by a facile hydrothermal method. Ultra-thin MoS₂ nanosheets were vertically grown on RGO in situ with C–O– functional group at the edges and plane of RGO as nucleation sites. This strong interfacial interaction between MoS₂ and RGO not only can increase the active sites of MoS₂ but also can alleviate the contact resistance between MoS₂ and RGO. Photodegradation of rhodamine (RhB) was adopted to evaluate the photodegradation ability of the products. Photocatalytic degradation performance of MoS₂/RGO composites with different composite ratios was also investigated. The degradation rate of 15 mg 7.5 wt% MoS₂/RGO (RGO:MoS₂) composite for 50 mL RhB solution with a concentration of 20 mg/L within 60 min can reach 96.6%, showing the highest photodegradation activity. The transfer and transport mechanism of photogenerated charges at composite interfaces are discussed in detail to explain the enhanced photocatalytic performance. After five cycles of catalyzing, the photocatalytic performance of MoS₂/RGO composite was not significantly lower.

[en] Objective: To categorize the significant complications occurred in the perioperative period of peripheral vascular interventions and to analyze their causes, outcomes and managements in order to make a further understanding of the cause of occurrence and to improve the handling ability. Methods: Over the past five years a total of 1620 consecutive peripheral vascular interventions were carried out in our institute. Significant complications, which occurred in the perioperative period, and the clinical data were carefully examined. The occurrence, treatment, consequence and final outcome of each complication were retrospectively analyzed. Results: Of 1620 consecutive peripheral interventional procedures, significant complication which developed during the operation or within one week after the treatment was seen in 76 (4.69%). The significant complications could be classified into twelve kinds. After proper management most complications were cured without leaving any sequelae. Nevertheless, in some patients permanent damages such as paraplegia, lower limb paralysis, necrosis of gluteus, etc. were left over. Death occurred in six patients. Of the six patients, four died of concomitant hepatic failure and agranulocytosis, one of retroperitoneal hematoma and hemoperitoneum, and another one of pulmonary embolism. Conclusion: (1) Significant complications may occur in most peripheral vascular interventional therapies, which, in most cases, are mainly related to the insufficient understanding of the disease and improper manipulation. (2) A comprehensive and solid fundamental knowledge of the disease, strictly following the indications and careful handling the operation are the key points to reduce the occurrence of severe complications in the perioperative period of peripheral vascular interventions. (authors)

[en] Objective: To analyze the long-term efficacy and safety of re-irradiation for recurrent glioma. Methods: The data of 52 patients with recurrent gliomas were collected from 2009 to 2019. The median planned target volume (PTV) was 73.5 cm³ (49.9-102.7 cm³) and the median dose was 45.0 Gy (43.0-48.8 Gy). Kaplan-Meier method was used for survival assessment, log-rank test for difference assessment, and Cox's regression model for multivariate prognostic analysis. Results: The median follow-up time was 32.6 months. The median overall survival (OS) and progression-free survival (PFS) time were 16.1 months (95%CI, 4.1-28.1) and 8.0 months (95%CI, 4.0-12.0). The 1-, 2- and 3- year survival rates were 67%, 43% and 29%, respectively. The 6- month, 1- year and 2- year PFS rates were 67%, 40%, 26%, respectively. Multivariate analysis showed that KPS score and recurrence time significantly affected the OS (P = 0.012, P = 0.001). KPS score and time interval between two radiotherapy significantly impacted the PFS (P = 0.003, P = 0.018). Stratified analysis showed that KPS score was the independent prognostic factor of OS and PFS in patients with WHO grade II initial pathology and reoperation after recurrence (P < 0.001, P = 0.012); clinical manifestation was the independent prognostic factor of OS and PFS in patients with WHO grade III and IV initial pathology (P = 0.006, P = 0.044). The overall incidence of adverse reactions was 30.8%. Grade 1 adverse reactions accounted for 25.0%, and 5.8% for grade 2. Conclusions: Re-irradiation for recurrent glioma yields good long-term clinical efficacy and tolerable adverse reactions. (authors)

[en] Objective: To evaluate the effect of metallic stent combined with stereotactic conformal radiotherapy (SCRT) for hilar cholangiocarcinoma. Methods: Fifty-four patients with hilar cholangiocarcinoma were analyzed, including 31 treated with stent plus stereotactic conformal radiotherapy (combined group) and 23 with metallic stent alone (control group). Results: The mean survival time of combined group was 11.1 ± 4.6 months, compared with 5.1 ± 2.8 months of the control group, giving a significant difference between the two groups (P<0.01). Conclusion: The combination of metallic stent and stereotactic conformal radiotherapy is more effective than metallic stent alone for unresectable hilar cholangiocarcinoma. (authors)