Physics Commons^™

Annotated Bibliography Of Ethical Issues In Physics: Collaboration, Marshall Thomsen

Ethics in Science and Engineering National Clearinghouse

The rules of collaboration, implicit and explicit, vary from one field to another in physics. This variation has not been studied much, although many general articles on collaboration exist.

Annotated Bibliography Of Ethical Issues In Physics: Research Misconduct, Marshall Thomsen

Ethics in Science and Engineering National Clearinghouse

Sometimes physicists cross the line in blatant, highly publicized ways, but lines are also crossed in much quieter ways.

Annotated Bibliography Of Ethical Issues In Physics: Data Management, Marshall Thomsen

Ethics in Science and Engineering National Clearinghouse

From acquiring and documenting data, to storing it and analyzing it, there are numerous procedures we employ to maintain the integrity of the data.

Annotated Bibliography Of Ethical Issues In Physics: Conflict Of Interest, Marshall Thomsen

Ethics in Science and Engineering National Clearinghouse

Conflicts can occur when we have competing interests arising from our role as scientists, our career objectives, our family interests, or our financial interests.

Annotated Bibliography Of Ethical Issues In Physics: Publication/Authorship, Marshall Thomsen

Ethics in Science and Engineering National Clearinghouse

Publications are used to both carry on public discourse in science and to measure the quality of research.

Annotated Bibliography Of Ethical Issues In Physics: Peer Review, Marshall Thomsen

Ethics in Science and Engineering National Clearinghouse

Peer review of journal submissions and grant applications plays an important role in what ideas and which individuals advance in physics.

Annotated Bibliography Of Ethical Issues In Physics: Mentorship, Marshall Thomsen

Ethics in Science and Engineering National Clearinghouse

The necessarily unequal relationship between faculty and their students and post-docs gives rise to a number of interesting issues.

Annotated Bibliography Of Ethical Issues In Physics: Under-Represented Groups, Marshall Thomsen

Ethics in Science and Engineering National Clearinghouse

The demographics of the physics profession in this country do not mirror the population at large in a number of ways that should cause us concern.

Annotated Bibliography Of Ethical Issues In Physics: Rcr Education Strategies, Marshall Thomsen

Ethics in Science and Engineering National Clearinghouse

Here is where to look for ideas on how to approach ethics education in a classroom or seminar setting.

Annotated Bibliography Of Ethical Issues In Physics: Physics And Society Issues, Marshall Thomsen

Ethics in Science and Engineering National Clearinghouse

No abstract provided.

Annotated Bibliography Of Ethical Issues In Physics: Physicists As Advisors To Society And Leaders, Marshall Thomsen

Ethics in Science and Engineering National Clearinghouse

During the last century, physicists have provided advice to society at large on critical issues. These references explore both the history of this advice and ethical standards that apply to those giving advice.

Ethical Issues In Physics: Getting Started, Marshall Thomsen

Ethics in Science and Engineering National Clearinghouse

Over the years, through discussions with colleagues and observations of debates in various forums, I have identified several concerns some have over the usefulness of ethics education in physics. I have classified some of these concerns as myths in that when they are accepted as fact, they lead us in the wrong direction.

Annotated Bibliography Of Ethical Issues In Physics: National Security, Marshall Thomsen

Ethics in Science and Engineering National Clearinghouse

World War II put physicists in the midst of a number of issues related to national security, raising questions such as, to what extent are physicists responsible for the use of their research?

Annotated Bibliography Of Ethical Issues In Physics: General Topics, Marshall Thomsen

Ethics in Science and Engineering National Clearinghouse

No abstract provided.

Annotated Bibliography Of Ethical Issues In Physics: Climate Change, Marshall Thomsen

Ethics in Science and Engineering National Clearinghouse

Physicists can play an important role in advancing the public debate on climate change.

Annotated Bibliography Of Ethical Issues In Physics: Energy Issues, Marshall Thomsen

Ethics in Science and Engineering National Clearinghouse

Many physicists are directly or indirectly involved in issues related to society’s use of energy.

Proposal Narrative, Morton Sternheim, Stephan Schneider

STEM Digital

No abstract provided.

Efficient Modeling Techniques For Time-Dependent Quantum System With Applications To Carbon Nanotubes, Zuojing Chen

Masters Theses 1911 - February 2014

The famous Moore's law states: Since the invention of the integrated circuit, the number of transistors that can be placed on an integrated circuit has increased exponentially, doubling approximately every two years. As a result of the downscaling of the size of the transistor, quantum effects have become increasingly important while affecting significantly the device performances. Nowadays, at the nanometer scale, inter-atomic interactions and quantum mechanical properties need to be studied extensively. Device and material simulations are important to achieve these goals because they are flexible and less expensive than experiments. They are also important for designing and characterizing new …

Theoretical And Experimental Aspects Of The Higgs Mechanism In The Standard Model And Beyond, Alessandra Edda Baas

Masters Theses 1911 - February 2014

The Standard Model of particle physics is the best existing theory for describing the interactions between elementary particles. Even though the Standard Model has been confirmed in many experiments, there remain unanswered questions. One of the main questions is how fermions and most gauge bosons get masses; the Standard Model begins with them as massless. The Higgs effect is a mechanism to explain how fermions and several gauge bosons do get masses in the Standard Model. The corresponding Higgs boson is the only particle that has not yet been detected.

This Thesis gives a complete review of the Higgs effect …

Efficiency Of Parallel Tempering For Ising Systems, Stephan Burkhardt

Masters Theses 1911 - February 2014

The efficiency of parallel tempering Monte Carlo is studied for a two-dimensional Ising system of length L with N=L^2 spins. An external field is used to introduce a difference in free energy between the two low temperature states.

It is found that the number of replicas R_opt that optimizes the parallel tempering algorithm scales as the square root of the system size N. For two symmetric low temperature states, the time needed for equilibration is observed to grow as L^2.18. If a significant difference in free energy is present between the two states, this changes to L^1.02.

It is therefore …

2010 Newsletter, Morton Sternheim

STEM Education Institute Newsletters

Nanotechnology 2010 Institute p. 2

STEM IPY

Polar Connections Institute p. 4

Legacy Beyond Our Doors p. 5

Nanotechnology Educationp.10

Tuesday & Saturday Seminars p.12

GRANTS REPORTS

STEMRAYS: After four years p. 3

Noyce Scholars: where are they now? p. 9

CLIMATE LITERACY

Are You Climate Literate? p. 6

Far Reaches of the Climate Literacy Conference p. 7

Testing the Schools p. 8

Department Of Physics Newsletter: Spring 2010, Bob Hallock, Bob Krotkov, Ken Langley, Gerry Peterson, Monroe Rabin, Hajime Sakai

Physics Newsletters

No abstract provided.

Using Solar Energy, Peter Talmage

Science and Engineering Saturday Seminars

• Best energy source for the environment • It’s getting more economical every day • Easy to maintain • Cuts down on foreign oil imports

Type-1.5 Superconductivity In Multiband Systems: The Eects Of Interband Couplings, Johan Carlstrom, Egor Babaev, Martin Speight

Physics Department Faculty Publication Series

In contrast to single-component superconductors, which are described at the level of Ginzburg- Landau theory by a single parameter and are divided in type-I < 1= p 2 and type-II > 1= p 2 classes, two-component systems in general possesses three fundamental length scales and have been shown to possess a separate \type-1.5" superconducting state1,2. In that state, as a consequence of the extra fundamental length scale, vortices attract one another at long range but repel at shorter ranges, and therefore should form clusters in low magnetic elds. In such clusters one can dene a negative interface energy inside a cluster and at the same there one …

Observation Of Thermomechanical Equilibration In The Presence Of A Solid 4he Conduit, M Ray, R Hallock

Physics Department Faculty Publication Series

We observe a thermomechanical effect when a chemical-potential difference is created by a temperature difference imposed between two liquid reservoirs connected to each other through Vycor rods in series with solid hcp 4He. By creating a temperature difference, ΔT, between the two reservoirs, we induce a rate-limited growth of a pressure difference between the two reservoirs, ΔP. In equilibrium ΔP vs ΔT is in quantitative agreement with the thermomechanical effect in superfluid helium. These observations confirm that below ∼600 mK a flux-limited flow exists through the solid helium.

Growth Of Solid Hcp 4he Off The Melting Curve, M Ray, R Hallock

Physics Department Faculty Publication Series

We report studies of the growth of solid hcp 4He at pressures higher than the bulk freezing pressure using a cell design that allows us to inject atoms into the solid. Near the melting curve during injection we observe random events during which the pressure recorded in the cell drops abruptly. These events are accompanied by transient increases in the temperature of the cell. We discuss these transients and conclude that they represent the solidification of meta-stable liquid regions and the associated relief of strain in the local solid. We also observe that further from the melting curve the transients …

Elastic Building Blocks For Confined Sheets, R Schroll, Katifori, B Davidovitch

Physics Department Faculty Publication Series

We study the behavior of thin elastic sheets that are bent and strained under the influence of weak, smooth confinement. We show that the emerging shapes exhibit the coexistence of two types of domains that differ in their characteristic stress distributions and energies, and reflect different constraints. A focused-stress patch is subject to a geometric, piecewise-inextensibility constraint, whereas a diffuse-stress region is characterized by a mechanical constraint - the dominance of a single component of the stress tensor. We discuss the implications of our findings for the analysis of elastic sheets that are subject to various types of forcing.

Smooth Cascade Of Wrinkles At The Edge Of A Floating Elastic Film, J Huang, B Davidovitch, C Santangelo, T Russell, N Menon

Physics Department Faculty Publication Series

An ultrathin polymer sheet floating on a fluid forms a periodic pattern of parallel wrinkles when subjected to uniaxial compression. The wave number of the wrinkle pattern increases sharply near the fluid meniscus where the translational symmetry of this one-dimensional corrugated profile is broken. We show that the observed multiscale morphology is controlled by a new “softness” number that quantifies the relative strength of capillary forces at the edge and the rigidity of the bulk pattern. We discover a new elastic cascade by which the wrinkling pattern in the bulk is smoothly matched to the fine structure at the edge …

A Simple Radionuclide-Driven Single-Ion Source, M Montero Diez, T Daniels, K Kumar, A Pocar, Et. Al.

Physics Department Faculty Publication Series

We describe a source capable of producing single barium ions through nuclear recoils in radioactive decay. The source is fabricated by electroplating 148Gd onto a silicon α-particle detector and vapor depositing a layer of BaF2 over it. 144Sm recoils from the alpha decay of 148Gd are used to dislodge Ba+ ions from the BaF2 layer and emit them in the surrounding environment. The simultaneous detection of an α particle in the substrate detector allows for tagging of the nuclear decay and of the Ba+ emission. The source is simple, durable, and can be manipulated and used in different environments. We …

Suppression Of The Critical Temperature For Superfluidity Near The Mott Transition, S Trotzky, L Pollet, F Gerbier, U Schnorrberger, I Bloch, Nikolai Prokof'ev, Boris Svistunov, M Troyer

Physics Department Faculty Publication Series

Ultracold atomic gases in optical lattices have proven to be a controllable, tunable and clean implementation of strongly interacting quantum many-body systems. An essential prospect for such quantum simulators is their ability to map out the phase diagram of fundamental many-body model Hamiltonians. However, the results need to be validated first for representative benchmark problems through state-of-the-art numerical methods of quantum many-body theory. Here we present the first ab initio comparison between experiments and quantum Monte Carlo simulations for strongly interacting Bose gases on a lattice for large systems (up to particles). The comparison enables thermometry for the interacting quantum …