scholarly journals Feeding and Pore Formation in Semisolid Metal Casting

Metals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1560
Author(s):  
Anders E. W. Jarfors ◽  
Qing Zhang ◽  
Stefan Jonsson
Keyword(s):  
Pore Formation ◽  
Decisive Role ◽  
Shrinkage Porosity ◽  
Metal Casting ◽  
Semisolid Casting ◽  
Semisolid Metal

Semisolid casting can provide excellent castings, but the nature of the pore-forming mechanisms has not been properly clarified. In the current communication, it was suggested that hydrogen precipitated during slurry making might have a decisive role in the formation of both gas and shrinkage porosity. Intensive stirring at the end of the slurry making process may act as a degassing step. Without the intense shearing, structures of primary slurry particles form around the hydrogen pores, strongly affecting pore formation and feeding during the intensification stage.

scholarly journals Feeding and Pore Formation in Semisolid Metal Casting

2020 ◽  
Author(s):  
Anders E. W. Jarfors ◽  
Qing Zhang ◽  
and Stefan Jonsson
Keyword(s):  
Pore Formation ◽  
Decisive Role ◽  
Shrinkage Porosity ◽  
Metal Casting ◽  
Semisolid Casting ◽  
Semisolid Metal

Semisolid casting can provide excellent castings, but the nature of the pore-forming mechanisms has not been properly clarified. In the current communication, it was suggested that hydrogen precipitated during slurry making might have a decisive role in the formation of both gas and shrinkage porosity. Intensive stirring at the end of the slurry making process may act as a degassing step. Without the intense stirring, structures of primary slurry particles form around the hydrogen pores, strongly affecting pore formation and feeding during the intensification stage.

A Decisive Role of Si and Ge Energy Levels in the Process of Pore Formation during Electrochemical Etching in Hydrofluoric Acid Solutions

2020 ◽  
Vol 495 (1) ◽  
pp. 178-181
Author(s):  
A. M. Khort ◽  
A. G. Yakovenko ◽  
A. A. Dementeva ◽  
Yu. V. Syrov ◽  
A. S. Sigov
Keyword(s):  
Hydrofluoric Acid ◽  
Pore Formation ◽  
Electrochemical Etching ◽  
Energy Levels ◽  
Decisive Role ◽  
Acid Solutions

Rheoprocessing of Semisolid Aluminum Alloys

2019 ◽  
Author(s):  
Sayavur Bakhtiyarov ◽  
Dennis A. Siginer
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
Complex Shape ◽  
Processing Technique ◽  
Metal Casting ◽  
Metal Processing ◽  
Semisolid Metal

A semisolid metal processing technique is one of the newest metal casting technologies (less than 40 years). However, it has already proved itself as a commercially workable technology for the production of complex shape metallic components with improved mechanical properties and dimensional tolerances. The review of the commercially significant aluminum alloys and the specifics of their rheology are presented in this article.

Semisolid Casting of Automotive Component: Water Pump Lid

2006 ◽  
Vol 116-117 ◽  
pp. 88-91
Author(s):  
H. Wang ◽  
Jun Xu
Keyword(s):  
Dendritic Structure ◽  
Casting Machine ◽  
Heating System ◽  
Shrinkage Porosity ◽  
Die Design ◽  
Water Pump ◽  
Automotive Component ◽  
Multi Stage ◽  
Reheating Process ◽  
Semisolid Casting

Water pump lid is selected as the automotive component to be cast using semisolid casting technology. Semisolid feedstock of alloy A357 was produced by a vertical continuous DC casting with electromagnetic stirring. Non-dendritic structure was obtained in the feedstock billets. A 6-station induction heating system was developed for feedstock billet reheating. Multi-stage reheating and well controlled reheating process resulted in a uniform temperature profile in the billet. Semisolid casting was carried out in a conventional high pressure die casting machine. Die design and casting parameters were adjusted to be suitable for semisolid casting. Compared with the conventional liquid melt casting, semisolid casting resulted in a much higher microstructural integrity with reduced shrinkage porosity.

Reforming Arab Reason

2018 ◽  
Vol 11 (1-2) ◽  
pp. 19-42
Author(s):  
Khalid Shibib
Keyword(s):  
Arab World ◽  
Legal Reasoning ◽  
Decisive Role ◽  
Arab Countries ◽  
Religious Knowledge ◽  
Intrinsic Factors ◽  
Knowledge Based ◽  
Present Information ◽  
Cultural Construct ◽  
Political Economic

As a humanitarian worker who was professionally involved for decades in crisis- and war-shaken countries, the author strove to understand the political, socioeconomic, and cultural factors contributing to conflicts. This contextualization, with a focus on Arab countries, confirmed what other thinkers found: the majority of political, economic, social, cultural, religious, and finally humanitarian crises in the Arab world are man-made and can be attributed to both extrinsic and intrinsic factors. Central to the latter appears to be a shared cultural construct that can be termed “Arab reason.” This essay tries to present information on various aspects of the crisis; to understand why reform efforts come so late and why are they are more difficult for Arabs than for other Muslims. It continues by looking at the knowledge systems that govern Arab reason and their evolution, including the decisive role of the religious knowledge system. From there, it proposes some reform ideas including a renewed legal reasoning process with the goal of a future-oriented, knowledge-based, and inclusive Arab Islamic vision. A pragmatic way forward could be an additional unifying eighth legal school (madhhab/madhāhib) to counter sectarian conflicts and violence. This essay is built on a targeted literature search and is not a comprehensive review of the growing literature generated by distinguished thinkers on various aspects of Arab Islamic identity.

The public and the private: reconfiguring the interrelationship during a civil act

2019 ◽  
pp. 53-69
Author(s):  
Natalia Kostenko
Keyword(s):  
Public Sphere ◽  
Public Space ◽  
Rapid Development ◽  
Online Communication ◽  
Decisive Role ◽  
Physical Interaction ◽  
Bare Life ◽  
Public And Private ◽  
The Public ◽  
The Public Sphere

The subject matter of research interest here is the movement of sociological reflection concerning the interplay of public and private realms in social, political and individual life. The focus is on the boundary constructs embodying publicity, which are, first of all, classical models of the space of appearance for free citizens of the polis (H. Arendt) and the public sphere organised by communicative rationality (Ju. Habermas). Alternative patterns are present in modern ideas pertaining to the significance of biological component in public space in the context of biopolitics (M. Foucault), “inclusive exclusion of bare life” (G. Agamben), as well as performativity of corporeal and linguistic experience related to the right to participate in civil acts such as popular assembly (J. Butler), where the established distinctions between the public and the private are levelled, and the interrelationship of these two realms becomes reconfigured. Once the new media have come into play, both the structure and nature of the public sphere becomes modified. What assumes a decisive role is people’s physical interaction with online communication gadgets, which instantly connect information networks along various trajectories. However, the rapid development of information technology produces particular risks related to the control of communications industry, leaving both public and private realms unprotected and deforming them. This also urges us to rethink the issue of congruence of the two ideas such as transparency of societies and security.

Civilization stress, cardiovascular risk, evidence based medicine, guideline

2009 ◽  
Vol 150 (19) ◽  
pp. 895-902 ◽  
Author(s):  
Kornél Simon
Keyword(s):  
Cardiovascular Risk ◽  
Cardiovascular Diseases ◽  
Chronic Stress ◽  
Randomized Clinical Trials ◽  
Decisive Role ◽  
Profit Sharing ◽  
Pole Position ◽  
Ethical Question ◽  
Drug Sale ◽  
Target Values

Cardiovascular diseases have the pole-position on the list of morbidity and mortality statistics. Despite the great advances have been made in management of cardiovascular diseases, prevalence of these disorders increases worldwide, and even younger and younger ages are threatened. This phenomenon is strongly related to obesity and type 2 diabetes pandemic, which shows an unequivocal association with expansion of modernized life-style. The pathomechanism proposed to have central role is the chronic stress induced by civilized life-conduct. The authors criticizes the everyday practice suggested for management of cardiovascular diseases, focusing on normalization of cardiovascular risk factors, instead of fighting against the primary cause ie. chronic stress. There is growing evidence, that achieving the target values defined in guide-lines will not necessarily result in improvement of patient related clinical outcomes. The statistical approach generally practiced in randomized clinical trials is primarily striving for the drug-sale, instead of discovering novel pathophysiological relations. Pharmaceutical industry having decisive role in research and patient-care is mainly interested in profit-sharing, therefore patients’ interest can not be optimally realized, and costs are unnecessarily augmented. Separation of patient-, and business-oriented medical care is an ethical question of fundamental importance.

Nasser's Gamble

2012 ◽  
Author(s):  
Jesse Ferris
Keyword(s):  
Cold War ◽  
Middle East ◽  
Arab World ◽  
Decisive Role ◽  
Original Material ◽  
Egyptian Revolution ◽  
Arab Nationalism ◽  
The 1960S ◽  
The Cold War ◽  
The Arab Spring

This book draws on declassified documents from six countries and original material in Arabic, German, Hebrew, and Russian to present a new understanding of Egypt's disastrous five-year intervention in Yemen, which Egyptian president Gamal Abdel Nasser later referred to as “my Vietnam.” The book argues that Nasser's attempt to export the Egyptian revolution to Yemen played a decisive role in destabilizing Egypt's relations with the Cold War powers, tarnishing its image in the Arab world, ruining its economy, and driving its rulers to instigate the fatal series of missteps that led to war with Israel in 1967. Viewing the Six Day War as an unintended consequence of the Saudi–Egyptian struggle over Yemen, the book demonstrates that the most important Cold War conflict in the Middle East was not the clash between Israel and its neighbors. It was the inter-Arab struggle between monarchies and republics over power and legitimacy. Egypt's defeat in the “Arab Cold War” set the stage for the rise of Saudi Arabia and political Islam. Bold and provocative, this book brings to life a critical phase in the modern history of the Middle East. Its compelling analysis of Egypt's fall from power in the 1960s offers new insights into the decline of Arab nationalism, exposing the deep historical roots of the Arab Spring of 2011.

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