Purpose
This study aims to investigate the thermohydrodynamic (THD) and thermoelastohydrodynamic (TEHD) performance of an air-lubricated thrust bearing under different slip conditions, especially the slip length effect.
Design/methodology/approach
In this study, a new modified boundary slip model was established to investigate thrust bearing performance. The THD and TEHD bearing characteristic distribution was analyzed with fluid–thermal–structure interaction approach. The effect of the slip length on the bearing performance was studied using various bearing structure parameters.
Findings
The increased slip length changed the classical feature distribution of the film pressure and temperature. The sacrifice of the bearing load capacity effectively compensated for the aerodynamic thermal effect and friction torque under the slip condition. The TEHD model has a lower film pressure and load capacity than the THD model. However, it also has lower film temperature, lower friction torque and smaller Knudsen number (Kn).
Originality/value
The bearing THD and TEHD performances of the modified boundary slip model were compared with those of a traditional no-slip bearing. The results help to guide the selection of the bearing surface materials and processing technology of rotor and foil, so as to fully control the degree of slip and make use of it.
Background: Anti-γ-aminobutyric acid type A receptor (anti-GABAA R) encephalitis is a neurological disorder that primarily manifests as cognitive dysfunction and seizures. Affected patients rarely present with subclinical epilepsy; thus, they are prone to misdiagnosis and underdiagnosis due to a lack of available tests during early disease stages.
Case presentation: An 83-year-old male presented with a 20-day history of progressively worsening hypomnesis. On admission, cognitive dysfunction was indicated based on a Simple Mental State Examination (MMSE) and Montreal Cognitive Assessment (MoCA) scores of 8 and 4, respectively. Electroencephalography (EEG) showed paroxysmal spike-slow complex wave bursts in all regions, and cerebrospinal fluid was positive for anti-GABAA R β3 antibodies (titer 1:3.2). The patient was diagnosed with anti-GABAA acid A encephalitis and treated with methylprednisolone sodium succinate, gamma globulin, and mycophenolate mofetil capsules. After treatment, hypomnesis gradually improved, and EEG findings transitioned from paroxysmal spike-slow complex wave bursts in various regions to clusters of predominantly theta and delta waves. Thereafter, the patient was discharged from the hospital. After discharge, the patient continued taking oral methylprednisolone and mycophenolate mofetil capsules, but self-discontinued methylprednisolone after one month. At the five-month follow-up, the hypomnesis was significantly improved, and MMSE and MoCA scores were 18 and 14, respectively, revealing moderate cognitive impairment.
Conclusions: Anti-GABAA R encephalitis manifesting clinically as cognitive dysfunction and subclinical epilepsy is rare. Therefore, early, comprehensive, and meticulous ancillary examinations with timely and effective treatment planning are crucial for improving the duration of recovery and prognosis of the disease.
Background: Ectopic thymoma are rare thymic tumorslocated in regions other than the anterior mediastinum. It is even rarer to find patients with intrapulmonary ectopic thymoma and myasthenia gravis . In particular, patients with pulmonary masses with pulmonary symptoms such as cough, sputum, and dyspnea are highly susceptible to misdiagnosis. Here, we report the clinical data, tumor pathology, treatment, and prognosis of a patient with intrapulmonary ectopic thymoma and myasthenia gravis after thymoma surgery and review the relevant literature.
Case presentation: Forty-five days ago, a 54-year-old female patient with a 12-year earlier clinical diagnosis of myasthenia gravis (type II) with thymoma (type B1) and thymoma resection presented with ptosis of the right upper eyelid with double vision. Enhanced chest computed tomography revealed a tumorous lesion in the supraglottic segment of the upper lobe of the left lung. After wedge resection of the upper lobe of the lung, the pathological biopsy and immunohistochemistry suggested pulmonary thymoma (mainly type B3). After surgery, the patient was treated with long-term oral pyridostigmine bromide combined with adjuvant radiation therapy.
Discussions and Conclusion: This case report and review of the related literature show that even after removal for thymoma, there is a possibility of recurrence and unexpected sites of recurrence, such as the lungs.It is also important to consider the possibility of other rare neurological diseases such as thymoma located in the lungs in addition to lung tumors in patients with pulmonary masses, whether the patient presents with or without myasthenia gravis.Early lung biopsy can lead to early identification and treatment of the disease.This case provide a reference for the clinical diagnosis of intrapulmonary ectopic thymoma and improve its clinical treatment.
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