Polyanion doping shows great potential to improve electrochemical performance of Li-rich layered oxide (LLO) materials. Here, by optimizing the doping content and annealing temperature, we obtained boron-doped LLO materials Li1.2Mn0.54Ni0.13Co0.13BxO2 (x = 0.04 and 0.06) with comprehensively improved performance (94% capacity retention after 100 cycles at 60 mA/g current density and a rate capability much higher compared to that of the pristine sample) at annealing temperatures of 750 and 650 °C, respectively, which are much lower than the traditional annealing temperature of similar material systems without boron. The scenario of the complex crystallization process was captured using Cs-corrected high-angle annular dark field scanning transmission electron microscopic (HAADF-STEM) imaging techniques. The existence of layered, NiO-type, and spinel-like structures in a single particle induced by boron doping and optimization of annealing temperature is believed to contribute to the remarkable improvement of cycling stability and rate capability.
Purpose Hepatoid carcinoma of the ovary (HCO) and hepatoid carcinoma of the uterus (HCU) are rare malignancies that can be difficult to distinguish from other diseases such as hepatocellular carcinoma. In extremely rare cases, patients are negative for α-fetoprotein (AFP) by immunohistochemistry. Here we report 3 cases of HC of the female reproductive system, including 1 that was negative for AFP. Patients and Methods Three women aged 48, 56, and 67 years were treated at Qilu Hospital of Shandong University for HCO or HCU. We describe these cases in detail, including clinical features, diagnosis, treatment, and outcome, and review similar cases reported in the literature. Results All of our patients underwent surgery including hysterectomy and bilateral adnexectomy, and were treated with platinum-based chemotherapy. One patient died 3 months after the operation, and the other 2 are alive 22 and 63 months post surgery. Conclusion The first-choice treatment for HCO and HCU is staging surgery, which should be followed by platinum-based chemotherapy.
Biodegradable polymeric stents have received extensive attention due to the high efficiency in interventional therapy. Fabrication of well-defined polymeric stents still poses a significant fabrication challenge. This study aims to investigate the feasibility of using a homemade three-dimensional (3D) printing system to directly print customized polymeric stents. In the proposed system, a rotating shaft with controllable temperature and rotating speed has been integrated into a fused deposition modeling-based 3D printing system to support the printed stents stably in situ. In addition, the effects of operating conditions including the rotating speed, printing temperature, printing speed, and step distance on the dimensions of the 3D printed stents have been investigated. Furthermore, orthogonal experiments have been designed and performed to comprehensively explore the significance of each processing parameter. Finally, based on the obtained knowledge, polymeric stents with various structures have been successfully 3D printed using the homemade 3D printing system with relatively high shape fidelity. FIG. 7. Evaluation of the effects of operating conditions on the 3D printed stents. [Color figure can be viewed at wileyonlinelibrary.com] FIG. 8. Schematics and 3D printing results of three representative stent structures.
A general class of C3 -symmetric Ag9 clusters, [Ag9 S(tBuC6 H4 S)6 (dpph)3 (CF3 SO3 )] (1), [Ag9 (tBuC6 H4 S)6 (dpph)3 (CF3 SO3 )2 ]⋅CF3 SO3 (2), [Ag9 (tBuC6 H4 S)6 (dpph)3 (NO3 )2 ] ⋅NO3 (3), and [Ag9 (tBuC6 H4 S)7 (dpph)3 (Mo2 O7 )0.5 ]2 ⋅2 CF3 COO (4) (dpph=1,6-bis(diphenylphosphino)hexane), with a twisted trigonal-prism geometry was isolated by the reaction of polymeric {(HNEt3 )2 [Ag10 (tBuC6 H4 S)12 ]}n , 1,6-bis(diphenylphosphino)hexane, and various silver salts under solvothermal conditions. The structures consist of discrete clusters constructed from a girdling Ag9 twisted trigonal prism with the top and bottom trigonal faces capped by diverse anions (i.e., S(2-) and CF3 SO3 (-) for compound 1, 2×CF3 SO3 (-) for compound 2, 2×NO3 (-) for compound 3, and tBuC6 H4 S(-) and Mo2 O7 (2-) for compound 4). This trigonal prism is bisected by another shrunken Ag3 trigon at its waist position. Interestingly, two inversion-related Ag9 trigonal-prismatic clusters are dimerized by the Mo2 O7 (2-) ion in compound 4. The twist is amplified by the bulkier thiolate, which also introduces high steric-hindrance for the capping ligand, that is, the longer dpph ligand. Four more silver-sulfur clusters (namely, compounds 5-8) with their nuclearity ranging from 6-10 were solely characterized by single-crystal X-ray diffraction to verify the above-described synergetic effect of mixed ligands in the construction of Ag9 twisted trigonal prisms. Surprisingly, only cluster 1 emits yellow luminescence at λ=584 nm at room temperature, which may be attributed to a charge transfer from the S 3p orbital to the Ag 5s orbital, or mixed with metal-centered (MC) d(10) →d(9) s(1) transitions. Upon cooling from 300 to 80 K, the emission intensity was enhanced along with a hypsochromic shift. The good linear relationship between the maximum emission intensity and the temperature for compound 1 in the range of 180-300 K indicates that this is a promising molecular luminescent thermometer. Furthermore, cyclic voltammetric studies indicated that the diffusion- and surface-controlled redox processes were determined for compounds 1 and 3 as well as compound 4, respectively.
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