A 63-year-old man was admitted to the hospital with a>1-year history of repeated acid reflux and belching and a 1-month history of an abdominal mass.On admission,the patient was in good condition,and his vital sign...A 63-year-old man was admitted to the hospital with a>1-year history of repeated acid reflux and belching and a 1-month history of an abdominal mass.On admission,the patient was in good condition,and his vital signs were stable.Laboratory examinations revealed no significant abnormalities.展开更多
The diffusion and chemical reactions inside the catalyst particles and the heterogeneous flow structure in the computational cells are key factors to affect the accuracy of the coarse-grid simulation in circulating fl...The diffusion and chemical reactions inside the catalyst particles and the heterogeneous flow structure in the computational cells are key factors to affect the accuracy of the coarse-grid simulation in circulating fluidized bed(CFB)methanation reactors.In this work,a particle-scale model is developed to calculate the effective reaction rate considering the transient diffusion and chemical reactions in the particle scale,i.e.,the scale of the single catalyst particle.A modified sub-grid drag model is proposed to consider the effects of the meso-scale and chemical reactions on the heterogeneous gas-solid interaction,where the meso-scale is between the single particle and the whole reactor and featured with the particle cluster.Subsequently,a coupled model is developed by integrating the particle-scale and modified sub-grid drag models into CFD.Moreover,the coupled model is validated to achieve accurate predictions on the CO methanation process in a CFB riser.Notably,the coupled model can be performed with a coarse grid(∼58 times particle diameter)and a large time step(0.005 s)to accelerate the simulation.By simply changing the reaction kinetics,different gas-solid catalytic reaction systems can be simulated by using the coupled model.展开更多
Background:A uterine leiomyosarcoma is a relatively rare malignant tumor of the uterus with a high degree of malignancy that is prone to distant metastasis and recurrence in the early stages,and therefore has a poor p...Background:A uterine leiomyosarcoma is a relatively rare malignant tumor of the uterus with a high degree of malignancy that is prone to distant metastasis and recurrence in the early stages,and therefore has a poor prognosis.Plain and enhanced CT scans are important for the early diagnosis of uterine leiomyosarcoma.Case report:We report the case of a 47-year-old woman with a uterine leiomyosarcoma.A preoperative plain CT scan showed significant uterine enlargement,whereas an enhanced CT scan showed an uneven and significantly enhanced mass.A large mass was observed in the lower and middle parts of the abdomen intraoperatively.The large mass in the abdominal and pelvic cavities was a uterine mass with bilateral adnexal lesions,approximately 20 cm×20 cm×15 cm in size.Bilateral retroperitoneal masses were palpated.A total hysterectomy,left salpingectomy,right adnexectomy,and resection of the retroperitoneal mass were performed.The pathologic diagnosis was uterine leiomyosarcoma with bleeding and necrosis.Conclusions:Diagnosis of uterine leiomyosarcoma lacks clinical specificity.Imaging is helpful for early diagnosis,treatment,disease course assessment,and efficacy evaluation.Ultimately,a pathologic examination and biopsy are required to confirm the diagnosis.展开更多
基金supported by the National Natural Science Foundation of China(Project No.82160348)the Yunnan Province Major Special Plan(No.202302AA310018-D-8)+1 种基金the Youth Talent Project of Yunnan Province's“Xingdian Talent Support Program”(No.XDYC-QNRC-2022-0608)the 2024 Senior Health Technology and Medical Discipline Leader of Yunnan Provincial Health Commission(No.D-2024056).
文摘A 63-year-old man was admitted to the hospital with a>1-year history of repeated acid reflux and belching and a 1-month history of an abdominal mass.On admission,the patient was in good condition,and his vital signs were stable.Laboratory examinations revealed no significant abnormalities.
基金This work was supported by the National Natural Science Foundation of China(grant numbers 22108167,U1862116,and 22038011)the Fundamental Research Funds for the Central Universities(grant number GK202103036).
文摘The diffusion and chemical reactions inside the catalyst particles and the heterogeneous flow structure in the computational cells are key factors to affect the accuracy of the coarse-grid simulation in circulating fluidized bed(CFB)methanation reactors.In this work,a particle-scale model is developed to calculate the effective reaction rate considering the transient diffusion and chemical reactions in the particle scale,i.e.,the scale of the single catalyst particle.A modified sub-grid drag model is proposed to consider the effects of the meso-scale and chemical reactions on the heterogeneous gas-solid interaction,where the meso-scale is between the single particle and the whole reactor and featured with the particle cluster.Subsequently,a coupled model is developed by integrating the particle-scale and modified sub-grid drag models into CFD.Moreover,the coupled model is validated to achieve accurate predictions on the CO methanation process in a CFB riser.Notably,the coupled model can be performed with a coarse grid(∼58 times particle diameter)and a large time step(0.005 s)to accelerate the simulation.By simply changing the reaction kinetics,different gas-solid catalytic reaction systems can be simulated by using the coupled model.
基金supported by the National Natural Science Foundation of China(82160348 to BY)the Major Science and Technology Special Plan Project of Yunnan Provincial Department of Science and Technology(202302AA3100018 to BY)the Kunming Health Technology Talent Training Project(2022-SW(Reserve)-01 to BY).
文摘Background:A uterine leiomyosarcoma is a relatively rare malignant tumor of the uterus with a high degree of malignancy that is prone to distant metastasis and recurrence in the early stages,and therefore has a poor prognosis.Plain and enhanced CT scans are important for the early diagnosis of uterine leiomyosarcoma.Case report:We report the case of a 47-year-old woman with a uterine leiomyosarcoma.A preoperative plain CT scan showed significant uterine enlargement,whereas an enhanced CT scan showed an uneven and significantly enhanced mass.A large mass was observed in the lower and middle parts of the abdomen intraoperatively.The large mass in the abdominal and pelvic cavities was a uterine mass with bilateral adnexal lesions,approximately 20 cm×20 cm×15 cm in size.Bilateral retroperitoneal masses were palpated.A total hysterectomy,left salpingectomy,right adnexectomy,and resection of the retroperitoneal mass were performed.The pathologic diagnosis was uterine leiomyosarcoma with bleeding and necrosis.Conclusions:Diagnosis of uterine leiomyosarcoma lacks clinical specificity.Imaging is helpful for early diagnosis,treatment,disease course assessment,and efficacy evaluation.Ultimately,a pathologic examination and biopsy are required to confirm the diagnosis.
