Valve development

Part 1 book "Air conditioning and refrigeration" includes content: Air conditioning and refrigeration tools and instruments; development of refrigeration; voltage, current, and resistance; solenoids and valves; electric motors - selection, operational characteristics and problems; refrigerants - new and old; refrigeration compressors; condensers, chillers, and cooling towers; working with water cooling problems; evaporators.

320p dianmotminh01 20-05-2024 2 2   Download

Mitral regurgitation (MR) affects 2%–3% of the global population. The rising incidence of degenerative causes in developing countries leads to an increase in the number of surgeries for degenerative MR. In this study, we aimed to evaluate the safety, feasibility, and effectiveness of minimally invasive mitral repair (MIMR) using artificial chordae in complex cases of mitral valve regurgitation.

8p viohoyo 25-04-2024 3 1   Download

Congenital lower urinary tract obstruction (LUTO) is a rare but significant condition affecting fetal urinary tract development. LUTO has a range of etiologies, with posterior urethral valves (PUV) being the most common cause. The prenatal diagnosis of LUTO plays a crucial role in recognizing the condition and guiding management decisions.

5p vitiki 30-01-2024 2 2   Download

Rheumatic heart disease (RHD) is commonly seen in people from developing and low-income countries. More cases are being recorded in developed countries due to migration and globalization. RHD develops in people with a history of rheumatic fever; it is an autoimmune response to group A streptococcal infection due to similarities at the molecular level.

6p viwhitewolf 03-07-2023 5 2   Download

Platelets play a central role in the development of cardiovascular diseases and changes in their proteins are involved in the pathophysiology of heart diseases in humans. There is lack of knowledge about the possible role of platelets in congestive heart failure (CHF) in dogs.

13p vidarwin 23-02-2022 8 1   Download

Almost all elderly dogs develop myxomatous mitral valve disease by the end of their life, but the cavalier King Charles spaniel (CKCS) has a heightened susceptibility, frequently resulting in death at a young age and suggesting that there is a genetic component to the condition in this breed.

14p vigandhi 23-02-2022 7 1   Download

Infective endocarditis is a rare but severe condition associated with a high mortality rate in small animal patients. This condition is caused by a microbial (most often bacterial) infection of the valvular portion of the endocardium, from which proliferative and/or erosive lesions on the cardiac valves or immediately adjacent structures develop. The two most commonly affected cardiac valves are the aortic and mitral valves.

6p vigandhi 23-02-2022 14 1   Download

The present article describes a method of determination of low antimony concentrations using a graphite furnace AAS technique after electrochemical preconcentration. A 2-electrode flow-through cell was developed with a working electrode made of gold-coated porous carbon and an accessory Pt electrode. This cell worked in online coupling with the graphite furnace atomizer. Accumulation occurred from the 6 M hydrochloric acid solution and 2M nitric acid was used to dissolve and transport antimony into the sampling loop. The sampling loop was placed on a 6-way valve.

8p tudichquannguyet 29-11-2021 6 1   Download

Critical aortic stenosis (AS) is the single most problematic valvular disease we encounter in the ICU. Patients with critical AS have a fixed cardiac output and cannot meaningfully increase cardiac output to meet the physiologic demands of critical illness. In this article, we present the case of a 53-year-old man with severe AS and pulmonary hypertension who developed hypotension during waiting for an elective aortic valve replacement. We discuss practical considerations and emergent treatment for the hemodynamically unstable patient with critical AS.

6p trinhthamhodang1218 03-03-2021 16 1   Download

Development of the valves and septa of the heart depends on the formation and remodeling of the endocardial cushions in the atrioventricular canal and outflow tract. These cushions are populated by mesenchyme produced from the endocardium by epithelial-mesenchymal transition (EMT).

20p viwyoming2711 16-12-2020 6 0   Download

Bone morphogenetic protein (BMP) signalling has emerged as a fundamental pathway in endothelial cell biology and deregulation of this pathway is implicated in several vascular disorders. BMP signalling output in endothelial cells is highly context- and dose-dependent.

16p viwyoming2711 16-12-2020 7 1   Download

A portable modified atmospheric packaging (MAP) unit was developed for grain disinfestation. The developed MAP unit consisted of a grain holding unit and cover, sealing unit, flushing nozzle, pressure regulator, solenoid valve with timer, working table and carbon dioxide cylinder.

9p nguathienthan8 20-10-2020 8 1   Download

Pumping system powered by kinetic energy of water from nearby nallah can be a cheap, efficient and precise way of delivering water to nearby farm pond/open well. The pumping system is simple to develop, install, operate and very much cater to the need of rural remote area. It may be suitable for un-electrified as well as unreliable electric supply area provided suitable site conditions are available. The major components of spiral tube water wheel pumping system include rim, inlet valve, housing, flexible pipe, bearing, T-joint etc.

9p caygaocaolon6 30-07-2020 13 1   Download

Biogas is produced through anaerobic fermentation process of organic matter and it contains CH4, CO2, H2S and other gases. The main combustible gas in biogas is CH4 and the presence of other gases reduces the calorific value of biogas, hence for obtaining better performance of engine it is essential to remove CO2 and H2S present in raw biogas. The dry absorbent based biogas purification system was developed and its performance was evaluated.

6p angicungduoc6 22-07-2020 9 1   Download

One of the easiest and efficient way of water conservation to solve drinking water scarcity is rooftop water harvesting. However, the technology has some limitations with regard to its purification system. The commonly used sand and gravel filter is very prone to clogging and its cleaning is not an easy job. At the same time, the alternative upward flow mesh filter needs further improvement in cleaning efficiency and some hassle free drain cum back washing mechanism. In upward flow mesh filter system, which creates anaerobic condition will give foul smell.

7p kethamoi6 29-06-2020 15 1   Download

Bi-reactor open core gasifier was built with the capacity to process approximately 15 kg of briquettes per hour. The reactor was made up of double walled cylindrical body with 300 mm of outer cylinder diameter and 244 mm of inner cylinder diameters excluding the thickness of sheet 6 mm. Both the cylinders were made up of 3 mm M.S. sheet 18 SWG. Another reactor was fabricated with same specifications and both outlets were interconnected. Gate valves were fixed to regulate the air flow rate and control the producer gas.

6p quenchua6 15-06-2020 9 1   Download

The final goal of the work is to provide useful recommendations and guidelines for the design of a cold plug for the emergency draining system of a molten salt reactor. Some numerical thermal simulations were performed with ANSYS mechanical (Finite Element Method) to be compared with results of the experiments and to make extrapolations for a new component to be used in a reactor.

12p christabelhuynh 29-05-2020 32 3   Download

Development of knowledge of cardiovascular diseases and treatments strongly depends on understanding of hemodynamic measurements. Hemodynamic parameters, therefore, have been investigated using simulation-based methods.

10p tohitohi 19-05-2020 13 0   Download

Many areas of agricultural fields are effectively over or under irrigated due to spatial variability in water infiltration and runoff of rainfall and irrigation, crop water use and irrigation depth. Under-irrigated areas are subject to water stress, resulting in production loss, while over-irrigated areas suffer from plant disease and nutrient leaching. This research presents the design of microcontroller based soil moisture sensor was developed at College of agricultural Engineering, Bapatla.

9p trinhthamhodang4 22-03-2020 8 1   Download

In this paper, we develop a mathematical model for PRVs capable of describing complete operation modes of PRVs in practice. In addition, we show that the PRV model equation can be relaxed so that it is useful for formulation of NLP. With the proposed PRV model, the formulated NLP can be solved by NLP algorithms based gradient methods to high quality solution and in less computation time. Two benchmarks of WDSs are taken to demonstrate the efficiency of the proposed PRV model.

12p abcxyz123_02 03-03-2020 9 0   Download