1,426 research outputs found
Plasma propellant interactions in an electrothermal-chemical gun
Get PDFThis Thesis covers work conducted to understand the mechanisms
underpinning the operation of the electrothermal-chemical gun. The
initial formation of plasma from electrically exploding wires, through to
the development of plasma venting from the capillary and interacting
with a densely packed energetic propellant bed is included. The prime
purpose of the work has been the development and validation of
computer codes designed for the predictive modelling of the
elect rothe rmal-ch em ical (ETC) gun.
Two main discussions in this Thesis are:
a proposed electrically insulating vapour barrier located around
condensed exploding conductors and
the deposition of metallic vapour resulting in a high energy flux to
the surface of propellant, leading to propellant ignition.
The vapour barrier hypothesis is important in a number of fields where
the passage of current through condensed material or through plasma
is significant. The importance may arise from the need to disrupt the
fragments by applying strong magnetic fields (as in the disruption of
metallic shaped charge jets); in the requirement to generate a metallic
vapour efficiently from electrically exploding wires (as per ETC ignition systems); or in the necessity to re-use the condensed material after a
discharge (as with lightning divertor strips).
The ignition by metallic vapour deposition hypothesis relies on the
transfer of latent heat during condensation. It is important for the
efficient transfer of energy from an exploded wire (or other such
metallic vapour generating device) to the surface of energetic material.
This flux is obtained far more efficiently through condensation than
from radiative energy transfer, because the energy required to
evaporate copper is far less than that required to heat it to
temperatures at which significant radiative flux would be emitte
A gasdynamic gun driven by gaseous detonation
No full textA gasdynamic gun driven by gaseous detonation was developed to address the disadvantages of the insufficient driving capability of high-pressure gas and the constraints of gunpowder. The performance of this gasdynamic gun was investigated through experiments and numerical simulations. Much more powerful launching capability was achieved by this gun relative to a conventional high-pressure gas gun, owing to the use of the chemical energy of the driver gas. To achieve the same launching condition, the initial pressure required for this gun was an order of magnitude lower than that for a gun driven by high-pressure H-2. Because of the presence of the detonation, however, a more complex internal ballistic process of this gun was observed. Acceleration of projectiles for this gun was accompanied by a series of impulse loads, in contrast with the smooth acceleration for a conventional one, which indicates that this gun should be used conditionally. The practical feasibility of this gun was verified by experiments. The experiments demonstrated the convenience of taking advantage of the techniques developed for detonation-driven shock tubes and tunnels. (C) 2016 AIP Publishing LLC
Limited Government and Gun Control
Get PDFIn the following, the author presents a case for federally mandated gun control regulations. Specifically, the author argues—with reference to The Declaration of Independence, the Constitution, and the Bill of Rights—that the principle of limited government often used against federal gun control laws actually provides legitimate justification for them. The aim is to persuade gun advocates to accept such regulations from their own point of view
Sliding mode control of continuous-time weakly coupled systems
No full textSliding mode control is a form of variable structure control which is a powerful tool to cope with external disturbances and uncertainty. There are many applications of sliding mode control of weakly coupled system to absorption columns, catalytic crackers, chemical plants, chemical reactors, helicopters, satellites, flexible beams, cold-rolling mills, power systems, electrical circuits, computer/communication networks, etc. In this thesis, the problem of sliding mode control for systems, which are composed of two weakly coupled subsystems, is firstly addressed. This thesis presents three methods to study continuous-time linear weakly coupled systems using sliding mode control. First one is Utkin and Young's sliding mode control method for each subsystem using a decoupling transformation technique. Next one is a composite control approach composed of two controllers, which are a state feedback controller and a sliding mode controller. The last one is a sliding mode control technique using the Lyapunov approach. These methods provide controls which make the systems asymptotic stabile with a robust performance against parametric uncertainties and exogenous disturbances. In this thesis, we demonstrate the effectiveness of the proposed methods through theoretical and simulation results.M.S.Includes abstractVitaIncludes bibliographical referencesby Gun-Hyung Par
The Gun Control Movement
No full textThe Gun Control Movement, the latest addition to the Social Movements Past and Present series, provides a map of the social and political landscape of the gun control movement in the United States. It analyzes the relationship between guns and violence, American attitudes about gun control and how those attitudes affect and reflect the movement, and the future of gun control in the United States. Author Gregg Lee Carter discusses at length the letter and spirit of the Second Amendment to the Constitution. He focuses on the mid-1970s to the present, but also introduces a historical context for guns and gun control in Western cultures, with many cross-national comparisons concerning gun laws, gun prevalence, and gun violence. The Gun Control Movement is accessible not only to all academic levels but also to activists on both sides of the gun-control debate and to the general public. Carter does not present any easy solutions to the problems of gun violence. This lucid introduction to the key issues surrounding the movement will stimulate readers\u27 careful consideration
Assassinations and Mass Shootings : The Role of Critical Events in the Struggle for US Gun Policy
No full textabstract: In this paper, we examine Handgun Control Inc. and the National Rifle Association’s contributions to mobilizations, for and against gun control. As with any social and political movement, we find these two opposing networks, the proponents of gun control and the anti-gun control groups, utilizing each other’s frames, actions and policies as a way of countering the opposition and advancing their own agendas
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DIALOGUES ON GUN CONTROL.
No full textWhat happens when two intelligent American college students with different attitudes about guns launch into a careful exploration of the ethics of gun policy? What might a European exchange student add to the mix? All three characters in this book are fictional, the creation of author David DeGrazia's imagination. But their vigorous, respectful conversations over six meetings--well-informed by the latest empirical data and the best available philosophical arguments--shed needed light on the reality of guns in the U.S. today. These dialogues introduce students, professional academics, and others to the American experience with gun violence and gun policy, articulating ethical arguments supporting and opposing substantial gun control, and specific possibilities for reform. They also demonstrate how those who initially disagree about the place of guns in American society can communicate constructively and agree on many ideas. Dialogue 1 distinguishes the legal rights to private gun ownership from the ethics of gun policy and illustrates how the U.S. is an outlier with respect to gun violence, gun ownership, and gun politics. Dialogue 2 explores the overall social consequences of high rates of gun ownership and minimal regulation and enforcement. Then, turning to moral rights, Dialogue 3 probes the subtle relationships among a right to self-defense, its possible foundation(s), and alleged gun rights. Dialogue 4 turns to appeals to various liberties as possible bases for gun rights. Next, Dialogue 5 examines the possibility that various other moral rights--such as a right to a reasonably safe environment--can illuminate gun policy ethics. Finally, Dialogue 6 concludes with a fairly detailed exploration of the shape of morally defensible gun policy in the United States. Key features: Dialogue format provides an engaging and accessible exchange throughout the book Depth of the ethical analysis refutes those who believe the issues pertaining to guns are simple Up-to-date references and examples make the book more current than the competition
Design of High Viscosity Cement Gun for Vertebroplasty
No full textVertebroplasty is a minimally invasive procedure for treating spine. Cement leakage is problem occurring from usage of low viscosity bone cements. High viscosity bone cements are difficult to inject with current design of cement gun due to very high injection forces. A new design of cement gun is developed for injection of high viscosity bone cements with low injection forces.BMEBioMechanical EngineeringMechanical, Maritime and Materials Engineerin
Rancang Bangun Burner Peleburan Logam Tipe Gun Berbahan Bakar Liquified Petrolium Gas (LPG)
Get PDFDalam perkembangan teknologi pengecoran logam, burner yang baik adalah burner yang menghasilkan panas optimal dalam membakar tungku peleburan logam sehingga dapat mempercepat leburnya logam. Burner sebagai alat yang dapat mengatur pembakaran melakukan pencampuran antara udara dan bahan bakar sehingga dihasilkan pembakaran yang baik dan meningkatkan efisiensi pembakaran. Tujuan penelitian ini untuk merancang burner peleburan logam tipe gun berbahan bakar LPG yang mengarah pada produksi kalor yang dihasilkan pada saat pembakaran. Tahapan proses rancangan alat yaitu gambar desain alat, pemotongan bahan, dan perakitan alat hingga menjadi burner. Proses pengambilan data pada penelitian ini melakukan pengujian langsung pada burner sebagai data awal penelitian. Hasil penelitian bahwa alat pembakar tipe gun dirancang menghasilkan nilai kalor (q) sebesar 1311,35 kJ dengan rasio udara terhadap bahan bakar 1:10,17
Summary of state gun laws
No full text"January 9, 2013."; Summarizes Connecticut gun laws.Supersedes OLR research report 2007-R-0369 (same author, same title).; Harvested from the web on 1/15/1
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