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In order to improve the dispersibility of graphene in engine oil, the in - situ reduction method was adopted, so the complicated processes such as reduction of graphene oxide, freeze - drying and grinding operation to obtain powder were omitted, and the production cost was cut. The graphite oxide was reduced with the help of the reducibility of the base oil to produce a fine - sized, uniformly dispersed graphene engine oil improver. Furthermore, in the preparation process of the graphene oxide engine oil improver, anhydrous ethanol was used to wash the graphene oxide in the second half of the centrifugal washing process of graphene oxide, which greatly improved the dispersion of the graphene in the base oil. In the reduction process of graphene oxide, vitamin C was used as the reduction initiator, making the process environmentally friendly. Results obtained from the friction and wear test carried out on the MS - T3000 friction and wear instrument showed that when the graphene nanoparticle used as lubricant additive, the typical sheet structure and curl morphology of graphene could be observed on the surface of the attached object, indicating that "miniature ball bearing effect" was realized due to the addition of graphene, and thus a good solid lubrication effect was obtained. A large amount of graphene attaching to the metal surface reduced the shedding of the hard phases of the metal surface, protected the metal surface together with the engine oil and significantly improved the friction and wear properties of engine oil, therefore, showed significant effect on reducing the wear on automobile engines.

Uterine corpus endometrial carcinoma, one of the three most frequent cancers of the female reproductive system, primarily affects women who are perimenopausal or postmenopausal. Moreover, it is an epithelial cancer that develops in the endometrium, which is classified as either estrogen-dependent (type I) or non-estrogen-dependent (type II). Non-estrogen-dependent endometrial cancers include plasma cell carcinoma and undifferentiated/dedifferentiated endometrial carcinoma. Undifferentiated endometrial carcinoma is a rare but aggressive endometrial epithelial cancer that lacks any histologic differentiation and is classified as a high-grade endometrial cancer. This case presents that a patient had uterine corpus endometrial carcinoma during perimenopausal hormone therapy, and the patient was treated with sequential estrogen–progestin treatment for 3 years. During that period, she did not undergo a follow-up examination for the last 2 years due to the pandemic. Undifferentiated endometrial carcinoma is a special type of endometrial cancer that is not hormone-dependent, and whether the occurrence of this case is related to perimenopausal hormone therapy needs to be verified by more evidence-based clinical cases and further studies. [ABSTRACT FROM AUTHOR]

A scheme is proposed to enhance quantum correlation, including entanglement and steering, for two magnon modes in a cavity‐magnon hybrid system through coherent quantum feedback. The hybrid system consists of a microwave cavity and two YIG spheres, which incorporates a nonlinear flux‐driven Josephson parametric amplifier in order for the generation of two photons within the cavity simultaneously. A quantum coherent feedback loop is used for the reduction of effective dissipation. By modulating feedback parameters, optimal bipartite and tripartite entanglement, as well as quantum steering are derived. Importantly, compared with the same setup without coherent feedback, the proposed scheme significantly improves quantum correlation. Furthermore, by optimizing the feedback reflectivity and the ratio of cavity‐magnon coupling strength, the enhancement of asymmetric steering can be controlled. Notably, incorporating the feedback loop effectively increase its robustness against thermal noise, thus the scheme offer better prospect for experimental development. This study paves the way for advancements in quantum information processing and quantum entanglement within cavity‐magnonics. [ABSTRACT FROM AUTHOR]

Objective To investigate the clinical presentation, diagnosis, operative strategy and prognosis of idiopathic spinal cord herniation (ISCH). Methods and Results Clinical data of 11 ISCH cases with definite spinal cord dysfunction enrolled in Hainan Hospital and the First Medical Center of PLA General Hospital from August 2015 to December 2019 were retrospectively analyzed. The main clinical manifestations were hypesthesia of pain and temperature, while one case had lumbocrural pain and dysuria. Myasthenia or hypomyotonia was seen in 7 cases and hypermyotonia in 4 cases. One case occurred in the cervical spine, 9 cases occurred in the thoracic spine, and one case occurred in the lumbar spine. The mean Japan Orthopedic Association Scores (JOA) was 6.91. MRI demonstrated that the defect was mostly situated in the level of T4-7 vertebral bodies. Amyelotrophy and T2 hyperintense signal at the corresponding level could be detected. All patients were treated with correction of herniated spinal cord and dural defect repair, and the success rate of surgery was 100%. The postoperative clinical symptoms were improved and the postoperative recovery was well. There were no cerebrospinal fluid leakage and intracranial infection. The mean postoperative JOA score was 11.55, which was significantly improved, and the average rate of improvement was 76.44%. The average follow⁃up period for 11 patients without recurrence was 32 months. The preoperative clinical symptoms disappeared in 5 cases, improved significantly in 3 cases, and alleviate in 3 cases. Conclusions The difficulties of the treatment of ISCH are the preoperative diagnosis and the choice of the best surgical procedure. Early definite diagnosis and surgical treatment are helpful for clinical prognosis of patients.

Two cavity‐magnon subsystems coupled via the two single‐mode cavities mediated by a non‐degenerate parametric down conversion and each cavity carrying a magnon confined in a Yttrium‐iron‐garnet sphere is proposed to study one‐way quantum steering and asymmetric tripartite entanglement. The entanglement can be transferred from the two microwave cavities to the two separated magnon modes using magnetic dipole interaction. Different from previous schemes, the present study demonstrates efficient realization of controllable one‐way quantum steering between two magnon modes through asymmetric frequency detunings of the two magnon modes. In addition, an asymmetric tripartite entanglement can also be achieved. Furthermore, the system exhibits robustness to temperatures up to 100 mK, providing a promising avenue for utilizing cavity magnonics systems in unidirectional transmission of quantum information. [ABSTRACT FROM AUTHOR]

Cu/Cu2O-modified activated carbon composites (Cu/Cu2O@AC) were synthesized via an one-step solvothermal method. The characterization results indicated that copper was uniformly dispersed on the surface of AC as nano-sized Cu0 and Cu(I), which allowed Cu/Cu2O to make full contact with I−. The high specific surface area of Cu/Cu2O@AC and the affinity of Cu+ for I− led to the equilibrium adsorption capacity within forty minutes. Additionally, the removal of trace I− (300 μg L−1) at pH = 3 by Cu/Cu2O@AC reached 96.4%. This work provides a promising application for the inexpensive and efficient capture of trace iodine from medical wastewater. We synthesized Cu/Cu2O@AC composites for adsorption of iodide ions in solution. [ABSTRACT FROM AUTHOR]