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Articles 1771 - 1800 of 193457

Full-Text Articles in Engineering

Note For Contributors, Space And Defense Nov 2023

Note For Contributors, Space And Defense

Space and Defense

No abstract provided.


Table Of Contents Volume No. 2, Space And Defense Nov 2023

Table Of Contents Volume No. 2, Space And Defense

Space and Defense

No abstract provided.


Front Matter Volume 3 Issue 2, Space And Defense Nov 2023

Front Matter Volume 3 Issue 2, Space And Defense

Space and Defense

No abstract provided.


Notes For Contributors, Space And Defense Nov 2023

Notes For Contributors, Space And Defense

Space and Defense

No abstract provided.


An Alternative View On Space Deterrence, Dwight D. Rauhala, Jonty L. Kasku-Jackson Nov 2023

An Alternative View On Space Deterrence, Dwight D. Rauhala, Jonty L. Kasku-Jackson

Space and Defense

The authors of the “Space Deterrence” report provide thoughtful, common sense recommendations to strengthen space deterrence, and given the complexity of deterrence, provide a “layered defense” strategy. The first recommendation given was to improve space situational awareness (SSA). As the authors acknowledge, these recommendations are not “cost constrained.” Although this and other recommendations bear consideration, one difficult task will be in addressing potential costs. The next recommendation is to develop internal red lines, a system by which internal alerts provide notifications to the “national command authority.” (National Command Authorities was a term that referred collectively to the President of the …


Air Force Space Command Perspective On Space Deterrence, Mike Manor, Kurt Neuman Nov 2023

Air Force Space Command Perspective On Space Deterrence, Mike Manor, Kurt Neuman

Space and Defense

The Eisenhower Center for Space and Defense Studies embarked on an ambitious project when they tackled the subject of space deterrence. The end result is a comprehensive report that provides an excellent summary of changes in the strategic space environment, as well as a perceptive analytical framework for assessing deterrence options. The layered strategy – International Norms, Entanglement, Retaliation, and Denial – is an original model that nicely captures vital aspects of space deterrence. Closing out the report are recommendations that are practical and cogent, offering clear steps for improving the deterrent posture of the United States in space.


Deter War, Not Attacks Against Space Systems, John B. Sheldon Nov 2023

Deter War, Not Attacks Against Space Systems, John B. Sheldon

Space and Defense

The “Space Deterrence: The Delicate Balance of Risk” study by the Eisenhower Center for Space and Defense Studies has much merit to it. First, to undertake the task at all is praiseworthy given the enormity and importance of the topic. Second, the study contains many sensible points, ranging from the uncertain nature of deterrence to measures needed to physically protect space systems that policy makers and students of strategy would do well to note. But as noteworthy as the Space Deterrence study is, there are two wider points to consider that are not found in its pages. The omission of …


Strengthening Deterrence: Assuring Delivery Of Space Capabilities, Peter L. Hays Nov 2023

Strengthening Deterrence: Assuring Delivery Of Space Capabilities, Peter L. Hays

Space and Defense

The Eisenhower Center for Space and Defense Studies’ report on “Space Deterrence: The Delicate Balance of Risk” briefly overviews fundamental deterrence concepts and evaluates how deterrence functioned during the Cold War; it masterfully assesses the most relevant and applicable lessons for today’s space deterrence challenges. The report comprehensively and multi-dimensionally addresses space deterrence by discussing key issues, including the vulnerability gap the United Sates faces with respect to space capabilities, the difficulty of defense, problems with credibility of retaliation in an asymmetric environment, and weaknesses in space situational awareness (SSA) and attribution. It also makes key recommendations to develop internal …


A Good Starting Point For Deterrence, Dean Cheng Nov 2023

A Good Starting Point For Deterrence, Dean Cheng

Space and Defense

A central focus for much of the Cold War was determining what would deter the Soviet Union; this was a topic upon which many of the West’s best and brightest labored to determine. In order to deter the former Soviet Union, a huge intellectual edifice was erected, which helped guide a variety of military programs, including not only the American strategic triad of land-based and sea-based missiles and manned bombers, but tactical nuclear weapons, hardened command and control, and space-based early warning systems. It also incorporated concepts, such as “extended deterrence,” “escalation dominance,” and “mutual assured destruction.”


Space Deterrence: The Delicate Balance Of Risk, Roger G. Harrison, Deron R. Jackson, Collins G. Shackelford Nov 2023

Space Deterrence: The Delicate Balance Of Risk, Roger G. Harrison, Deron R. Jackson, Collins G. Shackelford

Space and Defense

The United States has created a military structure that is heavily satellite-dependent, without making corresponding improvements in the survivability of its space systems. The result is a classic opportunity for asymmetric, preemptive attack. The central question of this study is how to structure a strategy of deterrence to persuade potentially hostile actors that the costs of attack will nevertheless outweigh the benefits.


Preface For Volume 3 No. 1, Space And Defense Nov 2023

Preface For Volume 3 No. 1, Space And Defense

Space and Defense

No abstract provided.


Table Of Contents Volume 2 No. 1, Space And Defense Nov 2023

Table Of Contents Volume 2 No. 1, Space And Defense

Space and Defense

No abstract provided.


Front Matter Volume 3 No. 1, Space And Defense Nov 2023

Front Matter Volume 3 No. 1, Space And Defense

Space and Defense

No abstract provided.


Notes For Contributors, Space And Defense Nov 2023

Notes For Contributors, Space And Defense

Space and Defense

No abstract provided.


A Chinese Perspective On China-United States Cooperation In Space, Dingli Shen Nov 2023

A Chinese Perspective On China-United States Cooperation In Space, Dingli Shen

Space and Defense

This article describes the arrival of new space actors from Asia, with particular focus on China. It analyzes the lack of cooperation in civilian space programs between China and the United States (U.S.), and the possible negative consequence of this. The paper suggests that the principles of non-diversion and reciprocity in accession as the foundation for China-U.S. collaboration in the civilian sector of space collaboration. This paper addresses the ongoing defense program with space application by the two countries, suggesting an overall program for China and the U.S. to have dialogue, as well as collaboration in space areas, promoting mutual …


Strategic Communications With China About Space, Joan Johnson-Freese Nov 2023

Strategic Communications With China About Space, Joan Johnson-Freese

Space and Defense

In 2006, I published an article entitled “Strategic Communication with China: What Message About Space?”1 The article pointed out that difficulties encountered in trying to convey its message regarding the Global War on Terror to a global audience had convinced the United States, or at least the Defense Science Board, that it needed to use strategic communications more effectively. From there I extrapolated, “If one believes that big problems are best tackled in small bites, ‘space’ perhaps offers an area where the United States can begin to understand and tackle some of the strategic communication issues it faces.”2 Communication mishaps …


United States - China Engagement On Space: A Role For Canada, Wade Huntley Nov 2023

United States - China Engagement On Space: A Role For Canada, Wade Huntley

Space and Defense

As advancing technologies expand the scope of human activities in space, the international security implications of these activities have become increasingly contested. For the United Sates, military space capabilities now serve integral roles in a spectrum of terrestrial needs, and sustaining U.S. Security interests in space has become a key concern for many military planners. Meanwhile, the space technologies of many other countries are developing rapidly. Although an outright challenge of the U.S. position is not yet imminent, some countries already possess asymmetric capabilities posing genuine threats to U.S. space operations.


Space And Sino-American Security Relations, Peter L. Hays Nov 2023

Space And Sino-American Security Relations, Peter L. Hays

Space and Defense

China’s emphasis on space exploration and its development and use of space capabilities are prominent and tangible expressions of its emergence as a great power and make space an increasingly important dimension of Sino-American relations. In October 2003 China independently launched and recovered its first taikonaut, becoming just the third member of an elite spacefaring club with Russia and the United States. Then in January 2007 China first successfully tested a kinetic energy anti-satellite (ASAT) weapon and again joined Russia and the United States as one of only three states known to have demonstrated this capability. China’s growing power and …


Reflections On Sino-Us Space Cooperation, Dean Cheng Nov 2023

Reflections On Sino-Us Space Cooperation, Dean Cheng

Space and Defense

Since 2006, the US Air Force Academy’s Eisenhower Center for Space and Defense Studies has sponsored an annual workshop examining the strategic impact and implications of China’s space program. This workshop series has blossomed into a Track-II process, with participants from the People’s Republic of China (PRC), and unofficial US government presence.

A key focus of many of the discussions during these workshops has been the prospects for Sino-US cooperation in space. This issue has gained prominence since the 2007 PRC ASAT test, and the US subsequent 2008 American destruction of a malfunctioning satellite. Sino-US space cooperation is seen as …


Table Of Contents Volume 2 No. 3, Space And Defense Nov 2023

Table Of Contents Volume 2 No. 3, Space And Defense

Space and Defense

No abstract provided.


Front Matter Volume 2 No. 3, Space And Defense Nov 2023

Front Matter Volume 2 No. 3, Space And Defense

Space and Defense

No abstract provided.


Speech For The 2008 National Space Forum, Jane Harman Nov 2023

Speech For The 2008 National Space Forum, Jane Harman

Space and Defense

As many of you probably know, my Congressional district in Southern California is home to the Space and Missile Command – the arm of the Air Force tasked with developing and procuring the space assets that give America its eyes and ears in space.


Speech For The 2008 National Space Forum, Terry Everett Nov 2023

Speech For The 2008 National Space Forum, Terry Everett

Space and Defense

I would like to thank the Eisenhower Center for Space and Defense Studies and the Center for Strategic and International Studies for the invitation to speak today. I would also like to thank Dr. Hamre , Ambassador Harrison, and Peter Teets for their leadership. Peter Teets is a good friend and great space leader and I am honored to be among such individuals who I hold in high regard.


Speech For The 2008 National Space Forum, Wayne Allard Nov 2023

Speech For The 2008 National Space Forum, Wayne Allard

Space and Defense

Good afternoon. It is a pleasure to be here with all of you today at the National Space Forum, and it is an honor to be here with so many industry experts and leaders. I thank our sponsors, the Eisenhower Center for Space and Defense Studies at the U.S. Air Force Academy and also the Center for Strategic and International Studies, for hosting this important event and for giving me an opportunity to speak to you today. In the Senate I have long supported the Center for Space and Defense Studies, and I am pleased to see the Center executing …


Introduction The Eisenhower Legacy Nov 2023

Introduction The Eisenhower Legacy

Space and Defense

No abstract provided.


Table Of Contents Volume 2 No. 2, Space And Defense Nov 2023

Table Of Contents Volume 2 No. 2, Space And Defense

Space and Defense

No abstract provided.


Front Matter Volume 2 No. 2, Space And Defense Nov 2023

Front Matter Volume 2 No. 2, Space And Defense

Space and Defense

No abstract provided.


Reactive Chemistries For Protein Labeling, Degradation, And Stimuli Responsive Delivery, Myrat Kurbanov Nov 2023

Reactive Chemistries For Protein Labeling, Degradation, And Stimuli Responsive Delivery, Myrat Kurbanov

Doctoral Dissertations

Reactive chemistries for protein chemical modification play an instrumental role in chemical biology, proteomics, and therapeutics. Depending on the application, the selectivity of these modifications can range from precise modification of an amino acid sequence by genetic manipulation of protein expression machinery to a stochastic modification of lysine residues on the protein surface. Ligand-Directed (LD) chemistry is one of the few methods for targeted modification of endogenous proteins without genetic engineering. However, current LD strategies are limited by stringent amino acid selectivity. To bridge this gap, this thesis focuses on the development of highly reactive LD Triggerable Michael Acceptors (LD-TMAcs) …


Steel Deck Diaphragms: Characterizing The Hysteretic Behavior Of Light Gage Steel, Screw-Fastened, Support And Sidelap Connections And The Influence Of Support Connections On The Stability Behavior Of Panels, Divyansh Kapoor Nov 2023

Steel Deck Diaphragms: Characterizing The Hysteretic Behavior Of Light Gage Steel, Screw-Fastened, Support And Sidelap Connections And The Influence Of Support Connections On The Stability Behavior Of Panels, Divyansh Kapoor

Doctoral Dissertations

Steel deck diaphragms are planar structures that serve as critical components of a metal building’s lateral force-resisting system. These can be found in walls, floors, and roofs of metal buildings and aid with the lateral stability of the structure. The diaphragm design process involves the selection of materials, deck geometry, connections, and connection detailing across the steel panels. The American Iron and Steel Institute’s AISI S310 and Steel Deck Institutes DDM04 both provide design guidance on the selection and detailing of materials and fasteners for the applicable limit states of connections and stability of the panels. Both design codes provide …


Experimental Study Of Surfactants’ Performance For Suppressing Coal Dust With Respirable Size, Zidong Zhao, Ping Chang, Guang Xu, Apurna Ghosh, Ramakrishna Morla Nov 2023

Experimental Study Of Surfactants’ Performance For Suppressing Coal Dust With Respirable Size, Zidong Zhao, Ping Chang, Guang Xu, Apurna Ghosh, Ramakrishna Morla

Mining Engineering Faculty Research & Creative Works

Long-term exposure to coal dust can lead to severe health problems in coal workers, including Coal Workers' Pneumoconiosis, making effective control of coal dust in underground mines essential. Water spraying is a widely used method for controlling coal dust, and adding surfactants can remarkably enhance its effectiveness. While previous studies have examined the influences of different coal particle sizes on surfactant performance, they have primarily focused on inhalable dust with sizes less than 100 µm. The impact of finer particle sizes, such as respirable dust with sizes less than 10 µm, remains inconclusive. This study aims to investigate the effects …