# Physical Sciences and Mathematics Commons™

## All Articles in Physical Sciences and Mathematics

160670 full-text articles. Page 1 of 4034.

In Operando Mechanism Analysis On Nanocrystalline Silicon Anode Material For Reversible And Ultrafast Sodium Storage, 2018 University of Wollongong

#### In Operando Mechanism Analysis On Nanocrystalline Silicon Anode Material For Reversible And Ultrafast Sodium Storage, Lei Zhang, Xianluo Hu, Chaoji Chen, Haipeng Guo, Xiaoxiao Liu, Gengzhao Xu, Haijian Zhong, Shuang Cheng, Peng Wu, Jiashen Meng, Yunhui Huang, Shi Xue Dou, Hua-Kun Liu

##### Australian Institute for Innovative Materials - Papers

Presently, lithium-ion batteries (LIBs) are the most promising commercialized electrochemical energy storage systems. Unfortunately, the limited resource of Li results in increasing cost for its scalable application and a general consciousness of the need to find new type of energy storage technologies. Very recently, substantial effort has been invested to sodium-ion batteries (SIBs) due to their effectively unlimited nature of sodium resources. Furthermore, the potential of Li/Li+ is 0.3 V lower than that of Na/Na+, which makes it more effective to limit the electrolyte degradation on the outer surface of the electrode.[1] Nevertheless, one major obstacle ...

2018 Harvey Mudd College

#### Iterative Matrix Factorization Method For Social Media Data Location Prediction, Natchanon Suaysom

##### HMC Senior Theses

Since some of the location of where the users posted their tweets collected by social media company have varied accuracy, and some are missing. We want to use those tweets with highest accuracy to help fill in the data of those tweets with incomplete information. To test our algorithm, we used the sets of social media data from a city, we separated them into training sets, where we know all the information, and the testing sets, where we intentionally pretend to not know the location. One prediction method that was used in (Dukler, Han and Wang, 2016) requires appending one-hot ...

Recursive Non-Local Means Filter For Video Denoising, 2017 University of Dayton

#### Recursive Non-Local Means Filter For Video Denoising, Redha A. Ali, Russell C. Hardie

##### Electrical and Computer Engineering Faculty Publications

In this paper, we propose a computationally efficient algorithm for video denoising that exploits temporal and spatial redundancy. The proposed method is based on non-local means (NLM). NLM methods have been applied successfully in various image denoising applications. In the single-frame NLM method, each output pixel is formed as a weighted sum of the center pixels of neighboring patches, within a given search window.

The weights are based on the patch intensity vector distances. The process requires computing vector distances for all of the patches in the search window. Direct extension of this method from 2D to 3D, for video ...

Cybercrime Deterrence And International Legislation: Evidence From Distributed Denial Of Service Attacks, 2017 Singapore Management University

#### Cybercrime Deterrence And International Legislation: Evidence From Distributed Denial Of Service Attacks, Kai-Lung Hui, Seung Hyun Kim, Qiu-Hong Wang

##### Research Collection School Of Information Systems

In this paper, we estimate the impact of enforcing the Convention on Cybercrime (COC) on deterring distributed denial of service (DDOS) attacks. Our data set comprises a sample of real, random spoof-source DDOS attacks recorded in 106 countries in 177 days in the period 2004-2008. We find that enforcing the COC decreases DDOS attacks by at least 11.8 percent, but a similar deterrence effect does not exist if the enforcing countries make a reservation on international cooperation. We also find evidence of network and displacement effects in COC enforcement. Our findings imply attackers in cyberspace are rational, motivated by ...

Climate Change, Development, And The Global Commons, 2017 University of Dayton

#### Climate Change, Development, And The Global Commons, Robert J. Brecha

##### The Social Practice of Human Rights: Charting the Frontiers of Research and Advocacy

An important link between energy, climate change, human development, and human rights comes in the form of a question that has yet to be answered satisfactorily: The earth’s atmosphere and other physical systems are the ultimate example of the global commons. Do future generations have a human right to an unchanged earth system? Sustainable Development Goals 13, 14, and 15 imply an affirmative answer. Given that climate scientists have a good estimate of the amount of carbon dioxide that can be emitted before the safe uptake capacity of the atmosphere is breached, how do we allocate that remaining atmospheric ...

2017 University of Dayton

#### Encounters With Climate Change: How Sdg 13 Can Move From Awareness To Action, Rebecca C. Potter

##### The Social Practice of Human Rights: Charting the Frontiers of Research and Advocacy

In a well-known passage from his book I and Thou, Martin Buber relates his encounter with a tree: “I contemplate a tree,” he writes, and then lists the various ways he could perceive the tree, as an artist or biologist, as someone interested in the trees parts and construction or interested in its function as a living system. But in all cases, Buber observes, “the tree remains my object and has its place and its time span, its kind and condition.”

Yet sometimes, “if will and grace are conjoined,” Buber describes being drawn into a relation with the tree wherein ...

2017 University of Dayton

#### Democratic Civic Engagement: Transformative Local, Inclusive Decision-Making To Achieve Global Peace And Climate Solutions, Leah Ceperley

##### The Social Practice of Human Rights: Charting the Frontiers of Research and Advocacy

The UN Sustainable Development Goals call for action on Climate (No. 13) and Strengthening Governance (No. 16) as imperative to transform our world toward one that is resilient, just, and peaceful. Climate change is a global problem, marked frequently in the U.S. by indifference, with far-reaching impacts disproportionately burdening the poor and vulnerable worldwide. Global in scope, its sources, impacts, and fields of action are local. Combating indifference at the local level can strengthen local governance structures, build trust across ideological divides, and shift the conversation from indifference to action.

Using an example from a University of Dayton-sponsored National ...

2017 American Association for the Advancement of Science

#### Building Academic/Practitioner Teams For Human Rights Projects: Examples, Lessons Learned, And Pitfalls To Avoid, Theresa Harris

##### The Social Practice of Human Rights: Charting the Frontiers of Research and Advocacy

Academics are increasingly interested in getting out of their classrooms and labs to contribute their knowledge, expertise, and resources to help communities develop evidence-based policies. In addition to post-election initiatives such as the March for Science and 314 Action, many academics are joining “without borders”-type programs and organizations that connect academics with opportunities to volunteer their time and talents for “social good.”

One of the longest-running of these is On-call Scientists, an initiative of the American Association for the Advancement of Science (AAAS) that connects human rights organizations with pro bono scientists across all fields — life, physical, behavioral, and ...

C1: Applying The Cosmogenic Nuclide Dipstick Model For Deglaciation Of Mt. Washington, 2017 Bentley University

#### C1: Applying The Cosmogenic Nuclide Dipstick Model For Deglaciation Of Mt. Washington, P. Thompson Davis, Alexandria J. Koester, Jeremy D. Shakun, Paul R. Bierman, Lee B. Corbett

##### New England Intercollegiate Geological Conference 2017

Guidebook for field trips in Western Maine and Northern New Hampshire: New England Intercollegiate Geological Conference, p. 247-272.

C4: The New Hampshire Spherulitic Rhyolites: Rocks Of Importance To Prehistoric Native Americans, 2017 New Hampshire Geological Survey

#### C4: The New Hampshire Spherulitic Rhyolites: Rocks Of Importance To Prehistoric Native Americans, Sarah Baker, Boisvert Richard, J. Dykstra Eusden, Nathan Hamilton, Stephen Pollock

##### New England Intercollegiate Geological Conference 2017

Guidebook for field trips in Western Maine and Northern New Hampshire: New England Intercollegiate Geological Conference, p. 305-316.

C3: Transect From The Migmatized Central Maine Belt To The Bronson Hill Anticlinorium, 2017 Bates College

#### C3: Transect From The Migmatized Central Maine Belt To The Bronson Hill Anticlinorium, J. Dykstra Eusden, Sarah Baker, Jordan Cargill, Eric Divan, Ian Hillenbrand, Paul O'Sullivan, Audrey Wheatcroft

##### New England Intercollegiate Geological Conference 2017

Guidebook for field trips in Western Maine and Northern New Hampshire: New England Intercollegiate Geological Conference, p. 287-304.

C5: The Sandy River Re-Visited, 2017 University of Maine at Farmington

#### C5: The Sandy River Re-Visited, Julia Daly, Thomas Eastler, Daniel Locke

##### New England Intercollegiate Geological Conference 2017

Guidebook for field trips in Western Maine and Northern New Hampshire: New England Intercollegiate Geological Conference, p. 317-326.

2017 Keene State College

#### C6: Migmatites In Pinkham Notch, New Hampshire, Tim Allen

##### New England Intercollegiate Geological Conference 2017

Guidebook for field trips in Western Maine and Northern New Hampshire: New England Intercollegiate Geological Conference, p. 327-344.

C2: Field Relations, Petrography And Provenance Of Mafic Dikes, Western Maine, 2017 University of Maine at Farmington

#### C2: Field Relations, Petrography And Provenance Of Mafic Dikes, Western Maine, David Gibson, Donald Osthoff, Chase Rerrick

##### New England Intercollegiate Geological Conference 2017

Guidebook for field trips in Western Maine and Northern New Hampshire: New England Intercollegiate Geological Conference, p. 273-286.

2017 The Graduate Center, City University of New York

#### Asymptotic Counting Formulas For Markoff-Hurwitz Tuples, Ryan Ronan

##### All Graduate Works by Year: Dissertations, Theses, and Capstone Projects

The Markoff equation is a Diophantine equation in 3 variables first studied in Markoff's celebrated work on indefinite binary quadratic forms. We study the growth of solutions to an n variable generalization of the Markoff equation, which we refer to as the Markoff-Hurwitz equation. We prove explicit asymptotic formulas counting solutions to this generalized equation with and without a congruence restriction. After normalizing and linearizing the equation, we show that all but finitely many solutions appear in the orbit of a certain semigroup of maps acting on finitely many root solutions. We then pass to an accelerated subsemigroup of ...

2017 The Graduate Center, City University of New York

#### Some Results In Combinatorial Number Theory, Karl Levy

##### All Graduate Works by Year: Dissertations, Theses, and Capstone Projects

The first chapter establishes results concerning equidistributed sequences of numbers. For a given $d\in\mathbb{N}$, $s(d)$ is the largest $N\in\mathbb{N}$ for which there is an $N$-regular sequence with $d$ irregularities. We compute lower bounds for $s(d)$ for $d\leq 10000$ and then demonstrate lower and upper bounds $\left\lfloor\sqrt{4d+895}+1\right\rfloor\leq s(d)< 24801d^{3} + 942d^{2} + 3$ for all $d\geq 1$. In the second chapter we ask if $Q(x)\in\mathbb{R}[x]$ is a degree $d$ polynomial such that for $x\in[x_k]=\{x_1,\cdots,x_k\}$ we have $|Q(x)|\leq 1$, then how big can its lead coefficient be? We prove that there is a unique polynomial, which we call $L_{d,[x_k]}(x)$, with maximum lead coefficient under these constraints and construct an algorithm that generates $L_{d,[x_k]}(x)$.

Interstructure Lattices And Types Of Peano Arithmetic, 2017 The Graduate Center, City University of New York

#### Interstructure Lattices And Types Of Peano Arithmetic, Athar Abdul-Quader

##### All Graduate Works by Year: Dissertations, Theses, and Capstone Projects

The collection of elementary substructures of a model of PA forms a lattice, and is referred to as the substructure lattice of the model. In this thesis, we study substructure and interstructure lattices of models of PA. We apply techniques used in studying these lattices to other problems in the model theory of PA.

In Chapter 2, we study a problem that had its origin in Simpson, who used arithmetic forcing to show that every countable model of PA has an expansion to PA that is pointwise definable. Enayat later showed that there are 20 models with the ...

B5: Geology Of The Lower Ellis River Valley And Rumford Whitecap Mountain, Andover And Rumford, Maine, 2017 Maine Geological Survey

#### B5: Geology Of The Lower Ellis River Valley And Rumford Whitecap Mountain, Andover And Rumford, Maine, Lindsay J. Spigel, Amber T.H. Whittaker, Ryan P. Gordon

##### New England Intercollegiate Geological Conference 2017

Guidebook for field trips in Western Maine and Northern New Hampshire: New England Intercollegiate Geological Conference, p. 197-216.

B1: Geology Of The Bald Mountain-Saddleback Wind Range, West-Central Maine, 2017 University of Maine at Farmington

#### B1: Geology Of The Bald Mountain-Saddleback Wind Range, West-Central Maine, Douglas N. Reusch, Jake Hansen

##### New England Intercollegiate Geological Conference 2017

Guidebook for field trips in Western Maine and Northern New Hampshire: New England Intercollegiate Geological Conference, p. 119-134.

B3: Paleo-Dunes And Other Post-Glacial Oddities In The Woods And Fields Of New Sharon And Chesterville, Me, 2017 Mt. Blue High School

#### B3: Paleo-Dunes And Other Post-Glacial Oddities In The Woods And Fields Of New Sharon And Chesterville, Me, Patricia M. Millette, Benjamin Andrews, Anna Glass, Thaddeus Gunther, Roshan Luick

##### New England Intercollegiate Geological Conference 2017

Guidebook for field trips in Western Maine and Northern New Hampshire: New England Intercollegiate Geological Conference, p. 161-176.