Primary Malignant Cardiac Tumors (PMCTs) Successful Resection of a Huge Liposarcoma of the Heart

Primary cardiac tumors are rare with an incidence ranging from 0.001% to 0.03% in autopsy series. The prognosis of cardiac sarcomas remains poor because it proliferates rapidly, and distant metastases are often found at diagnosis. We present a case of liposarcoma in the atrium of the heart as case report and same time ,we do a literature review about it.  Case Report: We present the case of a young 30 years old female with a significant tumor of cardiac liposarcoma, with chief complaint of dyspnea, tachycardia and heart failure even angina pectoris. Conclusion: The diagnostician’s differential diagnosis must be broad when encountering common chief complaints, such as tachycardia, heart failure and angina pectoris

Traumatic Pulmonary Pneumatoceles (Pseudocyst)

Introduction: Traumatic pulmonary parenchymal cavitary lesions (TPPCs) are pulmonary pseudocysts raiding secondary to lung contusion. Method: To provide an overview of the etiology, presentation, diagnosis and treatment of TPPCs, and to discuss this in the context of a cohort of 12 retrospectively reviewed patients with TPPCs presenting to Sahlgrenska University Hospital, Gothenburg, Sweden, from January 2014 to December 2016. Between January 2014 and December 2016, a total of twelve trauma patients presented to Sahlgrenska University Hospital with TPPC following blunt trauma. Results: TPPCs are of limited clinical consequence. Inexperienced clinicians may treat these inappropriately. A Computed Tomography (CT) scan is the investigation of choice. Treatment is symptomatic. Intervention is indicated only in case of complications

The Effect of Wind on the Performance of the Three Short Natural Draft Dry Cooling Towers in an In-line Arrangement

Natural draft dry cooling tower (NDDCT) are a favourable choice for the cooling system of concentrated solar thermal power (CSP) plants located in arid regions with high solar radiation. However, additional cooling towers may be required as the capacity of the CSP plants is increased. The geometrical arrangement of the NDDCTs is an influencing parameter on the thermo-flow performance of the entire system. The aim of this study was to investigate the effect of tower spacing and crosswind velocity on the performance of three short NDDCTs in an in-line layout. The results showed that there is a noticeable interaction between the towers at different tower spacings and crosswind conditions. In the no-wind condition, the cooling performance of both towers is reduced with a small tower-spacing, as this limits the air supply and the airflow across the heat exchangers in both towers. However, in windy conditions, the redirection of flow due to the layout of the cooling towers can improve the performance of the towers. The performance of the middle and leeward tower is improved compared to the windward tower. This improvement becomes weaker with increasing tower spacing

A Numerical Investigation of the Influence of Wind on Multiple Short Natural Draft Dry Cooling Towers

The deployment of concentrating solar thermal power (CSP) plants in arid areas necessitatesthe use of dry cooling systems to reject heat from the condenser. As modular CSP plants are expanded, likewise there is a need to add additional cooling capacity, usuallyby the addition of more cooling towers. One of the challenges in adding additional cooling towers though is how to site these with respect to the original cooling tower.Previous research has shown that the capacity of short natural draft dry cooling towers (NDDCTs), as a condenser for CSP plants, can be significantly influenced by the wind. In this respect, the aim of this study was to computationally investigate the interaction between multiple NDDCTs. The results show that placement of NDDCTs can lead to significant variations in the cooling capacity under varying wind speeds. Furthermore, this workdeliversa generalised relationship describing the effect of wind flow on multiple cooling towers and exploreshow cooling tower layouts can be better configured for practical applications

The Effect of Wind on the Performance of Multiple Short Natural Draft Dry Cooling Towers

The layout of multiple natural draft dry cooling towers can have an influence on the performance of the cooling system in concentrated solar power (CSP) plants. Hence, the aim of this study was to investigate the effect of wind on the performance of multiple natural draft dry cooling towers (NDDCTs). Computational fluid dynamics (CFD) modelling was carried out to numerically analyse the performance of two short NDDCTs at different tower spacings, crosswind velocities and wind attack angles (the direction of the wind relative to a line drawn between the centres of the two towers). The results show that the cooling performance of the towers is a strong function of tower spacing and their orientation with respect to the wind direction. The findings of this study are essential for the layout installation of multiple short NDDCTs with respect to the most frequent direction of the crosswind in a specific location

Analytical solutions for rapid prediction of transient temperature field in powder-fed laser directed energy deposition based on different heat source models

The present paper aims to develop an effective analytical solution for laser directed energy deposition through powder feeding (LDED-PF). Three heat source models are introduced and compared to analytically describe the transient temperature field in the process. These models are known as point (1D) heat source, circular (2D) heat source, and semi-spherical (3D) heat source. For the validation tests, single-track deposition of Ti-5Al-5 V-5Mo-3Cr powder on Ti-6Al-4 V substrate is conducted at different laser powers, scanning speeds, and powder feed rates. The temperature field is validated using the measurement of melt-pool/deposit geometry. In order to improve the model fidelity, the enhanced thermal diffusivity and heat source radius are calibrated in terms of linear functions. It is found that the 2D Gaussian heat source model, which is in agreement with the underlying physics of the process, establishes a better match between the predicted and experimental data. The developed model only needs the basic information from the LDED-PF setup and material thermal properties to predict the thermal history and melt-pool geometry at different processing parameters