Thermopower of the Hubbard model: Effects of multiple orbitals and magnetic fields in the atomic limit

We consider strongly-correlated systems described by the multi-orbital Hubbard model in the atomic limit and obtain exact expressions for the chemical potential and thermopower. We show that these expressions reduce to the Heikes formula in the appropriate limits ($k_BT \gg U$) and ($k_BT \ll U$) and obtain the full temperature dependence in between these regimes. We also investigate the effect of a magnetic field introduced through a Zeeman term and observe that the thermopower of the multi-orbital Hubbard model displays spikes as a function of magnetic field at certain special values of the field. This effect might be observable in experiments for materials with a large magnetic coupling.Comment: 8 pages, 4 figures Typos in eqns. 3 and 4 and reference 17 correcte

Bridging The Communication And Collaboration Gap: A Project On Improving School Culture And Student Achievement

The purpose of this project was to analyze the impact communication and collaboration between special and general educators have on student achievement and school culture through a literature review. Additionally, the project was implemented to evaluate how different forms of communication can be used to begin to bridge the communication and collaboration gap that currently exists in a large-scale suburban school setting. The literature review defines and examines communication and collaboration and their implications in various settings, further specifying an educational setting. Furthermore, this project establishes meaning for the author, both professionally and personally, and its applications as well as future implications

Turning Heartache into Hope: How Fantasy Reveals Spiritual Truth about Sin, Suffering, and Redemption

This paper examines the problem of evil and suffering through the literary genre of fantasy. Seminal texts written by Christians in this genre present the problem of sin and death through themes and representative characters but also tempers the reality of suffering with the presence of Christ figures, who bring redemption to the characters and story world through an act of sacrifice. Following the examples of these seminal fantasies and building on my personal experience of loss, I approach the problem of sin and suffering in excerpts from my novel in progress, The Mountain Pass Keeper, by presenting an older protagonist, Creighton, who has struggled for many years with the grief of losing a loved one. Including an older main character instead of a younger one departs from the tradition of the youthful hero that is common in fantasies but heightens the awareness of pain and grief, thus bringing the problem of evil and suffering to the forefront of the story. Through the actions of the characters and the use of Christ figures, I present an honest portrayal of sin and suffering in the story while also providing a picture of the redemption and hope we can find in Jesus, who suffered most of all for our sake

Ropinirole in restless legs syndrome and periodic limb movement disorder

Restless legs syndrome and periodic limb movement disorder of sleep are now recognized as prevalent, distinct, yet overlapping disorders affecting all age groups. Although delineation of the mechanisms underlying these disorders continues to be the focus of very intense research efforts, it has become apparent that there is a prominent role for dopaminergic agents in the clinical management of these patients. Among the various dopaminergic drugs, ropinirole has undergone relatively intense and critical scrutiny, and appears to provide a safe and efficacious treatment option for patients with these two conditions. The more recent development of a controlled formulation for this drug is likely to yield additional benefits such as improved adherence and reduced fluctuations in daytime and nighttime symptoms. However, there is not enough evidence at this time to support such assumption

Resistance coefficients on ground-based winching of timber

This paper deals with the research of resistance differences in winching of logs with their thicker or thinner end turned forward.Winching represents traction of wood assortments on the ground from the felling site to the forest vehicle equipped with a forest winch. The winching coefficient is determined by the horizontal tractive force and weight of the traction load. The research of resistance in winching wood assortments was carried out for the purpose of determining the size of the forest winch designed for equipping the prototype of the thinning tractor assembly (adapted farming tractor, forest semi-trailer and hydraulic crane) and developing an environmentally and economically viable technology for timber production. The research was carried out on flat forestland in a pedunculate oak stand by winching three logs of different weight. The research results have shown that the winching coefficients depend on the weight of logs, shape of log and their direction. Higher weight causes higher traction resistance. In all cases, the winching coefficients were higher in winching of logs with their thicker end turned forward. In order to achieve lower ground-based traction resistance and, at the same time, cause less damage to forest soil, winching of logs should be carried out with their thinner end turned forward

The Next Generation of Space Cells for Diverse Environments

Future science, military and commercial space missions are incredibly diverse. Military and commercial missions range from large arrays of hundreds of kilowatt to small arrays of ten watts in various Earth orbits. While science missions also have small to very large power needs there are additional unique requirements to provide power for near-sun missions and planetary exploration including orbiters, landers and rovers both to the inner planets and the outer planets with a major emphasis in the near term on Mars. These mission requirements demand cells for low intensity, low temperature applications, high intensity, high temperature applications, dusty environments and often high radiation environments. This paper discusses mission requirements, the current state of the art of space solar cells, and a variety of both evolving thin-film cells as well as new technologies that may impact the future choice of space solar cells for a specific mission application

Demonstration of a Nano-Enabled Space Power System

The Nano-Enabled Space Power System will demonstrate power systems with nanomaterial-enhanced components as are placement for CubeSat power generation, transmission, and storage. Successful flights of these nano-power systems will accelerate the use of this revolutionary technology in the aerospace industry. The use of nano materials in solar cells, wire harnesses,and lithium ion batteries can increase the device performance without significantly altering the devices physical dimensions or the devices operating range (temperature,voltage, current). In many cases, the use of nanomaterials widens the viable range of operating conditions, such as increased depth of discharge of lithium ion batteries, tunable bandgaps in solar cells, and increased flexure tolerance of wire harnesses

Temperature-sensitive protein–DNA dimerizers

Programmable DNA-binding polyamides coupled to short peptides have led to the creation of synthetic artificial transcription factors. A hairpin polyamide-YPWM tetrapeptide conjugate facilitates the binding of a natural transcription factor Exd to an adjacent DNA site. Such small molecules function as protein-DNA dimerizers that stabilize complexes at composite DNA binding sites. Here we investigate the role of the linker that connects the polyamide to the peptide. We find that a substantial degree of variability in the linker length is tolerated at lower temperatures. At physiological temperatures, the longest linker tested confers a "switch"-like property on the protein-DNA dimerizer, in that it abolishes the ability of the YPWM moiety to recruit the natural transcription factor to DNA. These observations provide design principles for future artificial transcription factors that can be externally regulated and can function in concert with the cellular regulatory circuitry