j. luo

With regard to the pronounced pressure pulsation and cyclic thrust oscillation observed in the tail flow field of an underwater vehicle operating under over-expanded conditions, and drawing inspiration from flow control techniques involving porous media structures like submarine coral reefs and breakwaters, this paper presents an innovative proposition to incorporate a porous media layer on the tail wall of the nozzle in order to regulate the structure of the tail gaseous jets. To optimize the flow control of underwater vehicles, the utilization of porous media layers with varying degrees of porosity is employed to establish a model for underwater supersonic gaseous jets. This model scrutinizes the intricate structure of the tail gaseous jets, as well as the consequential wall pressure and thrust engendered by the nozzle. The findings eloquently demonstrate that the porous media model, boasting a porosity of 0.34, exerts a diminished influence on the morphological characteristics of the tail gaseous jets, while concurrently yielding a superior flow control effect on the pulsation of tail wall pressure and attenuating the differential thrust generated by the underwater vehicle. Consequently, this innovative approach effectively mitigates overall thrust oscillation, thereby enhancing the stability of the underwater vehicle throughout its submerged operations.

To investigate the difference in the effect of ultrasound-guided puncture injection of polidocanol (PO) and ethanol (ET) in the treatment of renal and hepatic cysts (RHC), and to analyze the factors related to patients’ prognosis of disease recurrence.

A total of 105 patients with RHC admitted to our hospital from August 2020 to August 2021. Among them, 59 patients received ultrasound-guided puncture injection of ET (control group); the rest 46 received ultrasound-guided puncture injection of PO (observation grou). The success rate of one-time puncture and adverse reactions of the two groups were counted, and the levels of C-reactive protein (CRP), Cortisol (Cor), liver and kidney function. Patients were then followed up for a one-year prognosis, and the prognosis of RHC recurrence was recorded. Logistic regression analysis was performed to analyze the factors associated with the recurrence of cysts.

Postoperative CRP and Cor were observed to be lower than those in the control group, and hepatic and renal function was better than that in the control group (P<0.05). In addition, the incidence of adverse reactions was lower in the observation group than in group B (P<0.05). Cyst diameter, incomplete cyst aspiration, and post-sclerotic segregation were high-risk independent factors affecting prognostic cyst recurrence (P<0.05).

Ultrasound-guided injection of PO puncture sclerosis for RHC has excellent results. At the same time, patients need to be concerned about the diameter of the cyst, incomplete aspiration of the cystic fluid, and whether the cyst is separated after sclerosis.

To determine the treatment efficacy and prognostic factors for high-grade glioma (HGG) patients treated with postoperative intensity-modulated radiotherapy (IMRT).

An analysis of 86 HGG patients who underwent surgery, radiotherapy (total dose: 54-60 Gy), and chemotherapy was performed retrospectively. The primary endpoint was Overall survival (OS), while the secondary endpoint was progression-free survival (PFS). Patient factors, tumor characteristics, and treatments were examined for their prognostic value.

Among the enrolled patients, there were 22 patients of grade III and 64 patients of grade IV. At the end of the study, 48 cases had died, and 66 cases had relapsed. The median OS was 24 months, while the median PFS was just 9 months. The mean OS of patients with grade III and IV glioma was 41 months and 16 months, respectively. Patients had relative survival rates of 73.2%, 46.6%, and 27.0% at 1, 2, and 5 years. The most common type of tumor recurrence was relapse within the radiation field. Univariate analysis indicated that sex, age, Karnofsky Performance Scale score (KPS), Pathological grade, tumor location, surgical approach, and adjuvant chemotherapy cycles were predictive factors for OS (P< 0.05). In contrast, sex, age, pathological grade, number of lesions, surgical approach, and adjuvant chemotherapy cycles were predictive factors for PFS (P < 0.05). According to multivariate analysis indicated that pathological grade, surgical approach, and adjuvant chemotherapy cycles were associated with longer OS and PFS (P< 0.05).

Grade III gliomas, total surgical resection, and adjuvant chemotherapy for more than six cycles were associated with more favorable survival outcomes in this study.

Numerical simulation was used to investigate the effect of an inclined volute tongue on the complex flow characteristics and the aerodynamic performance of multi-blade centrifugal fans. We focused on the effects of the clearance, the inclination angle and the volute tongue’s on controlling the centrifugal fan’s internal flow characteristics and aerodynamic performance. The results showed that the volute tongue’s reasonable clearance ratio and the inclined volute tongue design were beneficial to improving the flow pattern around the volute tongue and volute outlet of the centrifugal fan, as well as reducing the local flow loss. It is of great significance to increase the centrifugal fan’s static pressure and related efficiency by increasing the radius and inclination angle of the volute tongue. Due to the reduced of vortex, the local flow loss was reduced. Numerical results indicated that model C’s static pressure rose to 12.5Pa, and the related static-pressure efficiency of to 3.8% compared with the reference geometry due to the reduced of flow loss.