智能船风光互补布雷顿循环发电系统建模仿真及性能分析

提高新能源占比是我国当前能源发展的主趋势,风能与太阳能被认为是21世纪最具前景的可再生能源。本文提出了一种以燃气轮机为主,风能和太阳能为辅的船用风光互补-燃气轮机发电系统,为智能船动力与生活用电供应电能。采用Mworks系统建模软件对智能船风光互补燃气轮机发电系统进行建模并进行仿真分析,得到风光互补布雷顿循环发电系统运行特性。在阶跃风速下,系统总输出功率可以在5s内回归到8000kW的额定功率,意味着通过燃气轮机的调节,此系统能够快速应对恶劣且多变的环境条件;斜坡风速条件下系统总输出功率几乎保持8000kW额定功率不变,反映了系统能够稳定地输出有效功率,为船舶动力系统与日常用电供应电能。

1例培唑帕尼片致重度肝损伤的病例分析与药学监护

临床药师参与1例晚期肾癌患者重度肝损伤的护肝治疗过程,分析患者的既往用药史,结合实验室检查,采用Naranjo’s评估表评估培唑帕尼片引起重度肝损伤的可能性。查阅文献资料并结合患者实验室检查特点,对培唑帕尼引起肝损伤的可能机制进行分析,建议临床及时停药并给予个体化护肝治疗,最终该患者肝损伤明显好转。临床药师结合药学知识与临床实践,为临床提供个体化给药建议,充分体现了临床药师的价值。本病例可为培唑帕尼所致重度肝损伤的诊断与治疗提供一定的借鉴。

基于多系统集成仿真方法的燃气轮机动态特性仿真研究

In order to simulate the actual operation process of gas turbine more accurately,this paper uses multi system integration simulation technology to study the dynamic characteristics of gas turbine.Firstly,considering the factors such as variable stator vanes,air extraction,cooling mixing and multiple inertias,a refined model of gas turbine is established.Then,AMESim is used to establish the model of the VSV actuator of the gas turbine,and Flowmaster is used to establish the model of the secondary air system of the gas turbine.Finally,the multi-system integration simulation model of gas turbine is established by using interface technology to study the dynamic characteristics of gas turbine under load mutation.The simulation results show that the established multisystem simulation model of gas turbine can effectively simulate the dynamic operation process of gas turbine under the condition of load mutation,which is of great significance to the simulation research of gas turbine.

Anthropogenic activity,hydrological regime,and light level jointly influence temporal patterns in biosonar activity of the Yangtze finless porpoise at the junction of the Yangtze River and Poyang Lake,China

Under increasing anthropogenic pressure,species with a previously contiguous distribution across their ranges have been reduced to small fragmented populations.The critically endangered Yangtze finless porpoise(Neophocaena asiaeorientalis asiaeorientalis),once commonly observed in the Yangtze River-Poyang Lake junction,is now rarely seen in the river-lake corridor.In this study,static passive acoustic monitoring techniques were used to detect the biosonar activities of the Yangtze finless porpoise in this unique corridor.Generalized linear models were used to examine the correlation between these activities and anthropogenic impacts from the COVID-19 pandemic lockdown and boat navigation,as well as environmental variables,including hydrological conditions and light levels.Over approximately three consecutive years of monitoring(2020–2022),porpoise biosonar was detected during 93%of logged days,indicating the key role of the corridor for finless porpoise conservation.In addition,porpoise clicks were recorded in 3.80%of minutes,while feeding correlated buzzes were detected in 1.23%of minutes,suggesting the potential existence of localized,small-scale migration.Furthermore,both anthropogenic and environmental variables were significantly correlated with the diel,lunar,monthly,seasonal,and annual variations in porpoise biosonar activities.During the pandemic lockdown period,porpoise sonar detection showed a significant increase.Furthermore,a significant negative correlation was identified between the detection of porpoise click trains and buzzes and boat traffic intensity.In addition to water level and flux,daylight and moonlight exhibited significant correlations with porpoise biosonar activities,with markedly higher detections at night and quarter moon periods.Ensuring the spatiotemporal reduction of anthropogenic activities,implementing vessel speed restrictions(e.g.,during porpoise migration and feeding),and maintaining local natural hydrological regimes are critical factors for sustaining porpoise population viability.

Comparison of choroidal thickness measured by two methods

AIM: To examine the profile of the choroidal thickness (CT) in healthy myopia subjects and emmetropic participants by Heidelberg Eye explore software and Image 3 software so as to compare the agreement and reproducibility of the two methods. METHODS: Thirty-six study participants (36 eyes) were enrolled in this research. The fovea and parafoveal region (the region of 6mm diameter of the fovea as center) of the images were selected by spectral domain optic coherence tomography (SD-OCT). The choroidal thickness was measured manually by the Heidelberg Eye explore software (version 5.3.3.0, Heidelberg Engineering) with a vertical line and the Image 3 software with a line vertical to the retinal pigment epithelial layer. The agreement and reproducibility of the two methods were described by the Bland-Altmann analysis. RESULTS: As compared with Heidelberg Eye explore software (39.9186), the repeatability coefficient is lower calculated by Image 3 software (27.3525). The Bland-Altmann analysis showed that the limits of 95% CI of agreement analysis is -18.437-63.949 mu m and the upper limits of the precision of the 95% CI of agreement is between 16.102 and 111.796 mu m and the lower limits is range from -66.29-21.41 mu m, which reflected a great variations of the difference. CONCLUSION: The repeatability and agreement of measurement implied by Image 3 software was better than the Heidelberg Eye explore software. The Image 3 software should be used for measuring the choroidal thickness in future study in China.

Effect of Changes in Bolus Viscosity on Swallowing Muscles in Patients with Dysphagia after Stroke

To the Editor:In the last recent years,significant progress has been achieved in research on dysphagia.This is important because approximately 50% of patients with dysphagia after acute stroke still have a slow functional recovery,and the duration of disease may last for several months or the whole life.The ultimate aim of dysphagia treatment is for patients to be able to eat again and to examine if the influence of eating conditions is inevitable in dysphagia research.