Hydraulic Power Plants: A Textbook for Engineering Students

Hydraulic Power Plants: A Textbook for Engineering Students

Hydraulic Power Plants is a textbook for engineering students which explains the construction of hydraulic power plants. The book presents the theory of the working process for each part, i.e. the ...
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Impulse Water Turbine

Pp. 21-48 (28)

Jafar Mehdi Hassan, Salman Hussien Omran, Laith Jaafer Habeeb, Alamaslamani Ammar Fadhil Shnawa and Adrian Ciocănea

Abstract

Impulse water turbine (Pelton turbine or Pelton wheel) is the standard type of turbines that are widely used nowadays. It is also called a free jet turbine. Pelton turbine operates under the high head of water and therefore, requires a comparatively less quantity of water.

In this chapter, the components of hydro-electric power plants using this type of turbine are presented with neat sketches. Theory of power, all mathematical calculations using velocity diagrams, solutions for single or multi-sets, power regulation components, supply, and discharge systems are also presented. Finally, solved problems are illustrated in detail at the end of this chapter.

Keywords:

Components of impulse turbine, Pelton turbine, Power regulation mechanisms, Supply and discharge system.

Affiliation:

Mechanical Engineering Department, University of Technology, Iraq.

Hydraulic Power Plants: A Textbook for Engineering Students

Hydraulic Power Plants: A Textbook for Engineering Students

Hydraulic Power Plants is a textbook for engineering students which explains the construction of hydraulic power plants. The book presents the theory of the working process for each part, i.e. the ...
[view complete introduction]

US $
15

*(Excluding Mailing and Handling)



The Momentum Equation and Its Application

Pp. 1-20 (20)

Jafar Mehdi Hassan, Salman Hussien Omran, Laith Jaafer Habeeb, Alamaslamani Ammar Fadhil Shnawa and Adrian Ciocănea

Abstract

The major encountered in the hydraulic machine is to find the power developed (or consumed) by (or in) a particular machine. A turbine produces power while pumps, compressors, and fans consume power to run. The power is determined from the dynamic force or forces which are being exerted by the flowing fluid on the boundaries of the flow passage and which are due to the change of momentum. These are determined by applying "Newton's second law of motion".

In this chapter, we present the momentum equation and fluid dynamics forces in a simple way and a step by step manner related to the types of prime movers, turbines, pumps, water wheels ... etc. The force and power calculations using the velocity diagram for each type are presented too.

The derivation of Bernoulli's equation for relative motion based on consideration of momentum is very useful to present fluid motion inside a turbine runner or pump impeller of a centrifugal pump, which is shown in this chapter with solved problems.

Keywords:

Bernoulli`s equation, Momentum equation, Velocity diagram.

Affiliation:

Mechanical Engineering Department, University of Technology, Iraq.

Hydraulic Power Plants: A Textbook for Engineering Students

Hydraulic Power Plants: A Textbook for Engineering Students

Hydraulic Power Plants is a textbook for engineering students which explains the construction of hydraulic power plants. The book presents the theory of the working process for each part, i.e. the ...
[view complete introduction]


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Preface

Pp. iii

Jafar Mehdi Hassan

Affiliation:

Mechanical Engineering Department, University of Technology, Iraq.

Hydraulic Power Plants: A Textbook for Engineering Students

Hydraulic Power Plants: A Textbook for Engineering Students

Hydraulic Power Plants is a textbook for engineering students which explains the construction of hydraulic power plants. The book presents the theory of the working process for each part, i.e. the ...
[view complete introduction]


Back


Foreword

Pp. i-ii (2)

Riyadh S. Al-Turaihi

Affiliation:

Mechanical Engineering Department College of Engineering/Department of Mechanical Engineering Babylon University, Babil, Iraq.



Epigenetic regulation and promising therapies in colorectal cancer

(E-pub Abstract Ahead of Print)

Author(s): Chandra Kishore*

Journal Name: Current Molecular Pharmacology

Abstract:

The recent developments in epigenetics have shown a very important role of epigenetic changes in cancer initiation, development, and progression. Some of the important histone modifications shown to occur are methylation, acetylation, phosphorylation, citrullination, sumoylation, ADP ribosylation, deamination, ubiquitination, formylation, O-GlcNAcylation, propionylation, butyrylation, proline isomerization, and crotonylation but most of the studies in past had limited their studies mainly on histone methylation, acetylation, and phosphorylation. Modification of DNA strand by hypermethylation and hypomethylation regulates genomic instability and promotes cancer. Colorectal cancer involves multiple changes in epigenetic marks present on histone residues and DNA, which in collaboration with genetic changes, drives cancer progression. In this review paper, basic concepts of epigenetics relevant to cancer development are discussed followed by its significance in understanding the mechanism of colon carcinogenesis. Some of the epigenetic target based drugs are also discussed in the relevant sections to give an idea of the potential promises of epigenetics for colorectal cancer treatment.

Keywords: Colorectal cancer, histone modification, DNA methylation, epigenetic therapy, epigenetic marks, epigenetic crosstalk, Epigenetic signaling, posttranslational modifications

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Article Details

(E-pub Abstract Ahead of Print)
DOI: 10.2174/1874467214666210126105345
Price: $95


Hydraulic Power Plants: A Textbook for Engineering Students

Hydraulic Power Plants: A Textbook for Engineering Students

Author(s): Jafar Mehdi Hassan, Salman Hussien Omran, Laith Jaafer Habeeb, Alamaslamani Ammar Fadhil Shnawa and Adrian Ciocănea

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Foreword  promotion: free to download

Pp. i-ii (2)

Riyadh S. Al-Turaihi



Preface  promotion: free to download

Pp. iii

Jafar Mehdi Hassan



The Momentum Equation and Its Application

Pp. 1-20 (20)

Jafar Mehdi Hassan, Salman Hussien Omran, Laith Jaafer Habeeb, Alamaslamani Ammar Fadhil Shnawa and Adrian Ciocănea


PDF Price: $15



Impulse Water Turbine

Pp. 21-48 (28)

Jafar Mehdi Hassan, Salman Hussien Omran, Laith Jaafer Habeeb, Alamaslamani Ammar Fadhil Shnawa and Adrian Ciocănea


PDF Price: $15



Reaction Turbines

Pp. 49-102 (54)

Jafar Mehdi Hassan, Salman Hussien Omran, Laith Jaafer Habeeb, Alamaslamani Ammar Fadhil Shnawa and Adrian Ciocănea


PDF Price: $15



Similarity Laws for Turbine Specific Speed and Cavitations

Pp. 103-123 (21)

Jafar Mehdi Hassan, Salman Hussien Omran, Laith Jaafer Habeeb, Alamaslamani Ammar Fadhil Shnawa and Adrian Ciocănea


PDF Price: $15



Centrifugal and Positive Displacement Pumps

Pp. 124-210 (87)

Jafar Mehdi Hassan, Salman Hussien Omran, Laith Jaafer Habeeb, Alamaslamani Ammar Fadhil Shnawa and Adrian Ciocănea


PDF Price: $15



References  promotion: free to download

Pp. 211

Jafar Mehdi Hassan, Salman Hussien Omran, Laith Jaafer Habeeb, Alamaslamani Ammar Fadhil Shnawa and Adrian Ciocănea



Subject Index  promotion: free to download

Pp. 212-219 (8)

Jafar Mehdi Hassan, Salman Hussien Omran, Laith Jaafer Habeeb, Alamaslamani Ammar Fadhil Shnawa and Adrian Ciocănea




Efficacy and safety outcomes of short duration antiplatelet therapy with early cessation of aspirin post percutaneous coronary intervention: a systematic review and meta-analysis

(E-pub Abstract Ahead of Print)

Author(s): Firas R. AL-Obaidi*, Hayley A. Hutchings, Andy S.C. Yong, Laith Al-Rubaiy, Hasan Al-Farhan, Mohammed H. Al-Ali, Tahsin Al-Kinani, Mohammed Al-Myahi, Hussein Al-Kenzawi, Nazar Al-Sudani

Journal Name: Current Cardiology Reviews

Abstract:

Background: The optimal duration of dual antiplatelet therapy is a matter of ongoing research. Clinical studies are assessing the optimal duration with the most favourable risk to benefit ratio. The efficacy of P2Y12 receptor inhibitors has been shown comparable to aspirin in preventing recurrent ischaemic events in patients with coronary artery diseases.

Objectives: To investigate the outcomes of short-duration dual antiplatelet therapy after PCI with early discontinuation of aspirin while maintaining patients on P2Y12 inhibitor through systematic review and meta-analysis of available literature.

Methods: We systematically searched Pubmed, Cochrane Central Register of Controlled Trials (CENTRAL) and ClinicalTrials.gov. We included randomised controlled studies that measured clinical outcomes of efficacy (mortality and ischaemic events) and safety (bleeding) of short and standard duration dual antiplatelet therapy. The protocol of this study was registered in the International prospective register of systematic reviews PROSPERO registry (CRD42020171468).

Results: Four randomised controlled trials were included; GLOBAL LEADERS, SMART-CHOICE, STOPDAPT-2 and TWILIGHT. The total number of patients was 29,089. The safety outcomes showed a significant reduction in major bleeding events with short-duration dual antiplatelet therapy; risk ratio is 0.61 (95% CI 0.38-0.99; z=2,00, p=0.05). There was no difference between short and standard duration dual antiplatelet therapy regarding efficacy outcomes (all-cause death, major adverse cardiovascular events, myocardial infarction, stroke and stent thrombosis).

Conclusion: Short-duration dual antiplatelet therapy followed by P2Y12 inhibitor monotherapy after PCI is a feasible option and can be adopted, especially in patients with a high risk of bleeding.

Keywords: Percutaneous coronary intervention, coronary artery disease, dual antiplatelet therapy, short-duration DAPT, drug-eluting stent, P2Y12 inhibitor monotherapy

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(E-pub Abstract Ahead of Print)
DOI: 10.2174/1573403X17666210126104053
Price: $95



Stress and physical inactivity: two explosive ingredients for the heart in COVID-19 pandemic times

(E-pub Abstract Ahead of Print)

Author(s): Olívia Moraes Ruberti, Guilherme Defante Telles, Bruno Rodrigues*

Journal Name: Current Cardiology Reviews

Abstract:

Background: Coronavirus disease 2019 (Covid-19) pandemic is a global health crisis that has culminated in thousands of deaths. In order to reduce the spread of Sars-CoV-2 virus, governments of several countries have adopted social isolation as a strategy. However, social isolation has culminated in deleterious effects for the population’s health, including increased physical inactivity, stress and, consequently, adverse changes in body composition, cardiorespiratory capacity, muscle strength, physical functionality, and vascular events, which are increasingly pointed out as the main determinants of cardiovascular health. Staying physically active during lockdown is a challenge, especially for the population with a higher risk of mortality from COVID-19 who are still encouraged to maintain social distance until there is a vaccine available. Strategies to avoid physical inactivity, and reduce stress levels can promote cardiovascular protection, and must be considered during COVID-19 time.

Objectives: The aim of this paper is to discuss the risks of physical inactivity and stress for the cardiovascular system during the COVID-19 pandemic and propose strategies to protect cardiovascular health.

Conclusion: A home-based training protocol could be an interesting and effective strategy for the population who need to remain physically active and safe at home.

Keywords: Sedentary Behavior, Physical Inactivity, Cardiovascular Diseases, Exercise, stress, Coronavirus

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(E-pub Abstract Ahead of Print)
DOI: 10.2174/1573403X17666210126103204
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Advances in the synthesis of polyolefin elastomers with “chain-walking” catalysts and electron spin resonance research of related catalytic systems

(E-pub Abstract Ahead of Print)

Author(s): Lei Zhu, Haojie Yu*, Li Wang*, Yusheng Xing, Bilal Ul Amin

Journal Name: Current Organic Chemistry

Abstract:

In recent years, polyolefin elastomers play an increasingly important role in industry. The late transition metal complex catalysts, especially α-diimine Ni(II) and α-diimine Pd(II) complex catalysts, are popular “chain-walking” catalysts. They can prepare polyolefin with various structures, ranging from linear configuration to highly branched configuration. Combining the “chain-walking” characteristic with different polymerization strategies, polyolefins with good elasticity can be obtained. Among them, olefin copolymer is a common way to produce polyolefin elastomers. For instance, strictly defined diblock or triblock copolymers with excellent elastic properties were synthesized by adding ethylene and αolefin in sequence. As well as the incorporation of polar monomers may lead to some unexpected improvement. Chain shuttling polymerization can generate multiblock copolymers in one pot due to the interaction of the catalysts with chain shuttling agent. Furthermore, when regarding ethylene as the sole feedstock, owing to the “oscillation” of the ligands of the asymmetric catalysts, polymers with stereo-block structures can be generated. Generally, the elasticity of these polyolefins mainly comes from the alternately crystalline-amorphous block structures, which is closely related to the characteristic of the catalytic system. To improve performance of the catalysts and develop excellent polyolefin elastomers, research on the catalytic mechanism is of great significance. Electron spin resonance (ESR), as a precise method to detect unpaired electron, can be applied to study transition metal active center. Therefore, the progress on the exploration of the valence and the proposed configuration of catalyst active center in the catalytic process by ESR is also reviewed.

Keywords: Polyolefin elastomer, "chain-walking" catalyst, copolymerization, chain shuttling polymerization, "oscillating" catalyst, electron spin resonance.

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(E-pub Abstract Ahead of Print)
DOI: 10.2174/1385272825666210126100641
Price: $95