2,184 research outputs found
A Method of Preparing Studies of Trichinella spiralis Owen
This work was first attempted with the idea in mind of securing an adequate supply of laboratory material of Trichinella spiralis for classes in invertebrate Zoology at the State University of Iowa
Computer Aided Control System Design (CACSD)
The design of modern aerospace systems relies on the efficient utilization of computational resources and the availability of computational tools to provide accurate system modeling. This research focuses on the development of a computer aided control system design application which provides a full range of stability analysis and control design capabilities for aerospace vehicles
Itinerant ferromagnetism in a two-dimensional atomic gas
Motivated by the first experimental evidence of ferromagnetic behavior in a
three-dimensional ultracold atomic gas, we explore the possibility of itinerant
ferromagnetism in a trapped two-dimensional atomic gas. Firstly, we develop a
formalism that demonstrates how quantum fluctuations drive the ferromagnetic
reconstruction first order, and consider the consequences of an imposed
population imbalance. Secondly, we adapt this formalism to elucidate the key
experimental signatures of ferromagnetism in a realistic trapped geometry.Comment: Accepted for publication in Phys. Rev.
Tricritical behavior in itinerant quantum ferromagnets
It is shown that the peculiar features observed in the low-temperature phase
diagrams of ZrZn_2, UGe_2, and MnSi can be understood in terms of a simple
mean-field theory. The nature of the ferromagnetic transition changes from
second order to first order at a tricritical point, and in a small external
magnetic field surfaces of first-order transitions emerge which terminate in
quantum critical points. This field dependence of the phase diagram follows
directly from the existence of the tricritical point. The quantum critical
behavior in a nonzero field is calculated exactly.Comment: 4pp., 4 eps figure
THE BIOMECHANIST AS EXPERT WITNESS
INTRODUCTION
There is a critical need for qualified Biomechanists in the areas of civil and criminal litigation. Currently few "true Biomechanists" work in this area. This has resulted in a vacuum of qualified personnel being filled by people who speak to biomechanical issues with little or no education, training, and experience in anatomy, kinesiology, physiology, research methods, statistics and other areas that constitute the discipline of Biomechanics. The result is that legal decisions are made based upon incorrect or inadequate information.
We suggest that as professional Biomechanists we may have a responsibility to enter this area or in our absence abdicate our role to less qualified individuals. If we as a discipline do engage this role we will upgrade the quality and truthfulness of at least a portion of the litigation process
An adaptive security construct: insurgency in Sudan
Internal wars are by default the business of others, until someone says they are not. Artificially contained within the confines of the current international system, insurgent conflicts are considered domestic affairs only until they threaten external interests. In judging intrastate conflict by and large from a crisis-response perspective, conventional assessment methodologies, oriented largely toward interstate wars, tend to fall short in objectively analyzing the historical and dynamic aspects of internal wars. This thesis develops an Adaptive Security Construct (ASC) that aims to correct such shortcomings through the multi-disciplinary integration of three conceptual lenses: a qualitative situation estimate, a game-theoretic dynamic conflict model, and geospatially oriented nexus topography. Using Sudan's internal wars as a case study, where the existence of signed peace-agreements in both the south and Darfur exist in apparent contradiction of these conflicts' causes, the ASC iteratively correlates the analysis of each of the three lenses to provide an observer a more objective external view of conflicts that are inherently "internal." This thesis presents the ASC as an iterative process and perspective that enables the formulation of general imperatives and specific approaches in response to contemporary arenas of conflict, both in Sudan and within the international community at large.http://archive.org/details/andaptivesecurit109453057Major, United States ArmyMajor, United States Air ForceApproved for public release; distribution is unlimited
Synthesis of new, single-isomer quaternary ammonium derivatives of beta-cyclodextrin for electrophoretic enantiomer separations
The isolation of individual enantiomers of drugs is an important subject of
interest in the pharmaceutical and medical fields, because stereochemistry can have a
significant effect on the biological activity of the drug. Therefore, it is important to
develop enantiomeric separation methods for the determination of the optical purity of
drugs, since the undesired enantiomer is regarded as one of the impurities.
The available single isomer anionic cyclodextrins (CD) can resolve the
enantiomers of only a few weakly acidic analytes. To rectify this problem, the chloride
salts of heptakis(6-deoxy-6-morpholinio)-cyclomaltoheptaose (HMBCD), and mono(6-
deoxy-6-N,N,N r,N r,N r-pentamethylethylenediammonio)-cyclomaltoheptaose
(PEMEDA-BCD), the first members of the permanently charged, single-isomer cationic
cyclodextrin family, have been synthesized. The purity of process intermediates and
final products was determined by HPLC-ELSD and indirect UV-detection capillary
electrophoresis. Structural identity was verified by 1D and 2D NMR and massBoth cationic CD derivatives have been used for the separation of the
enantiomers of strong acid, weak acid, weak base, ampholytic, and neutral analytes by
capillary electrophoresis. Because the charge state of these cationic chiral resolving
agents is independent of the pH of the buffer, separation could be performed in both low
and high pH buffers without compromising the charge density of the resolving agent.
Contrary to expectation, the multiply charged HMBCD showed poor complexation with
the newly synthesized strong electrolyte test analytes. The weak binding between the
analytes and HMBCD resulted in separation of enantiomers of only three strong
electrolyte analytes. Strong complexation was observed between PEMEDA-BCD and
the anionic and nonionic analytes in both low and high pH buffers, though complexation
was stronger in the high pH buffer. Due to strong complexation between the anions and
PEMEDA-BCD, only low concentrations of the resolving agent were required to effect
good enantiomer resolutions.
spectrometry
Collection of relevant results obtained with the Skylab images by the Institute for Space Research, INPE
There are no author-identified significant results in this report
Giant Planar Hall Effect in Epitaxial (Ga,Mn)As Devices
Large Hall resistance jumps are observed in microdevices patterned from
epitaxial (Ga,Mn)As layers when subjected to a swept, in-plane magnetic field.
This giant planar Hall effect is four orders of magnitude greater than
previously observed in metallic ferromagnets. This enables extremely sensitive
measurements of the angle-dependent magnetic properties of (Ga,Mn)As. The
magnetic anisotropy fields deduced from these measurements are compared with
theoretical predictions.Comment: 3 figure
Agricultural scene understanding, volume 1
There are no author-identified significant results in this report
- …