198 research outputs found
A Qualitative Study of the Experiences of Gatekeeping Among PhD Counselor Educators
The purpose of this study was to examine the gatekeeping experiences of a group of PhD counselor educators, by utilizing a phenomenological approach. This design was chosen as it could best examine the lived experiences of the participants. Nine PhD counselor educators participated in this study through a series of two interviews. All of the participants had a general definition of gatekeeping and all were able to express clearly how important the process was in ensuring as much as possible that only qualified students enter their programs, graduate from their programs, and enter the field as effective counselors. Each participant also shared several what they called horror stories of students they had worked with and the issues involved, as well as what the results of their gatekeeping efforts were. It was in these stories that some of the challenges, frustrations, and stresses of gatekeeping emerged. Some of the challenges involved non-supportive departments, the difficulty of being able to actually quantify impairment issues, having to decide if the student would be able to mature and improve over time in the program, and what to do with students who grades are good or adequate but whose skill levels are not. These challenges, frustrations and stressors where greatly mitigated, though, by supportive departments and colleagues.
The stories of the participants in this study provided some important details and color about what it is like to be a PhD counselor educator, to be ultimately responsible for ensuring that only qualified, effective counseling students leave their program and enter the counseling field. The challenges, rewards, and ultimately the satisfaction of playing a role in the development of future counselors are clearly seen
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Design and implementation of a low-power hybrid capacitive MEMS oscillator
This paper reports on the design and implementation of a low power MEMS oscillator based on capacitively transduced silicon micromachined resonators. The analysis shows how design parameters of MEMS resonator impact on the power requirement of the oscillator, particularly with a view towards informing the impact of device and interface parasitics. The analysis is based on resonators fabricated in a 2-μm gap SOI-MEMS foundry process. The sustaining circuit, which is based on a Pierce topology, is fabricated in a standard 0.35 μm process. An automatic gain control (AGC) is adopted to suppress the mechanical non-linearity so as to improve oscillator frequency stability. The 110-kHz MEMS and CMOS dies are assembled within a standard ceramic package and electrically integrated through wire bonds. The oscillator core consumes 400 nA (900 nA with parasitic readout loading) at 1.2-V dc supply while demonstrating a frequency stability of less than 0.5 ppm. The work provides a thorough analysis and design guidelines for both MEMS and CMOS circuit design with a view towards minimizing overall power consumption. The implications of the results reported in this paper are towards enabling a new class of low power resonant MEMS sensors that utilize the oscillator as a front-end building block
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Numerical Study of the Impact of Vibration Localization on the Motional Resistance of Weakly Coupled MEMS Resonators
This paper presents a numerical study of the impact
of process-induced variations on the achievable motional
resistance Rx of one-dimensional, two-dimensional, cyclic and
cross-coupled architectures of weakly coupled, electrostatically
transduced MEMS resonators operating in the 250 kHz range.
We use modal analysis to find the Rx of such coupled arrays and
express it as a function of the eigenvectors of the specific mode of
vibration. Monte Carlo numerical simulations, which accounted
for up to 0.75% variation in critical resonator feature sizes, were
initiated for different array sizes and coupling strengths, for the
four distinct coupling architectures. Improvements in the mean
and standard deviation of the generated Rx distributions are
reported when the resonators are implemented in a cross-coupled
scheme, as opposed to the traditional one-dimensional chain. The
two-dimensional coupling scheme proves to be a practical and
scalable alternative to weakly coupled one-dimensional chains to
improve the immunity to process variations. It is shown that a
75% reduction in both the mean and standard deviation of the
Rx is achieved as compared to the traditional one-dimensional
chain for a normalized internal coupling k > 10-2.The authors would like to gratefully acknowledge the Qualcomm European Research Studentships in Technology and the UK Engineering and Physical Sciences Research Council.This is the accepted manuscript. The final version is available from IEEE at http://dx.doi.org/10.1109/JMEMS.2014.2371072
Investigating vibration dynamics of cross-coupled MEMS resonators for reduced motional resistance
This paper investigates the vibration dynamics of a closed-chain, cross-coupled architecture of MEMS resonators. The system presented here is electrostatically transduced and operates at 1.04 MHz. Curve veering of the eigenvalue loci is used to experimentally quantify the coupling spring constants. Numerical simulations of the motional resistance variation against induced perturbation are used to assess the robustness of the cross-coupled system as opposed to equivalent traditional open-ended linear one-dimensional coupling scheme. Results show improvements of as much as 32% in the motional resistance between the cross-coupled system and its one-dimensional counterpart
Comparison of morphological changes of corneal collagen fibers treated with collagen crosslinking agents using second harmonic generation images
Corneal cross-linking (CXL) is a common surgical procedure used to modify corneal biomechanics and stabilize keratoconus progression which is still under discussion. Its side effects, which are mostly related to anatomical unpredictability and stromal exposure, are the reason for the search for new CXL agents. In this work we have quantitatively evaluated the porcine corneal stroma architecture treated with collagen crosslinking agents such as riboflavin solutions and açai extract, using second harmonic generation microscopy. Aimed at evaluating the morphological changes in the corneal stroma after collagen crosslinking under a CXL chemical agent, a tubeness filter based Hessian matrix to obtain a 3D fiber characterization of the SHG images was applied. The results showed a curling effect and shortening of the collagen fibers treated with açai as compared to the control. They also showed a higher degree of clustering of the collagen fibers with larger empty spaces when compared to the other two groups. We believe that studies such as these presented in this paper are a good direct nondestructive and free labeling evaluation technique that allows the observation of morphologic features of corneas treated with new CXL agents.Fil: Zeitoune, Angel Alberto. Universidad Nacional de Entre RÃos. Instituto de Investigación y Desarrollo en BioingenierÃa y Bioinformática - Consejo Nacional de Investigaciones CientÃficas y Técnicas. Centro CientÃfico Tecnológico Conicet - Santa Fe. Instituto de Investigación y Desarrollo en BioingenierÃa y Bioinformática; ArgentinaFil: Bersanetti, PatrÃcia A.. Universidade Federal de Sao Paulo; BrasilFil: Schor, Paulo. Universidade Federal de Sao Paulo; BrasilFil: Erbes, Luciana Ariadna. Universidad Nacional de Entre RÃos. Instituto de Investigación y Desarrollo en BioingenierÃa y Bioinformática - Consejo Nacional de Investigaciones CientÃficas y Técnicas. Centro CientÃfico Tecnológico Conicet - Santa Fe. Instituto de Investigación y Desarrollo en BioingenierÃa y Bioinformática; ArgentinaFil: Cesar, Carlos L.. Instituto Nacional de Fotônica Aplicada à Biologia Celular; Brasil. Universidade Federal do Ceara; BrasilFil: Adur, Javier Fernando. Universidad Nacional de Entre RÃos. Instituto de Investigación y Desarrollo en BioingenierÃa y Bioinformática - Consejo Nacional de Investigaciones CientÃficas y Técnicas. Centro CientÃfico Tecnológico Conicet - Santa Fe. Instituto de Investigación y Desarrollo en BioingenierÃa y Bioinformática; Argentin
Vacuum Packaged Low-Power Resonant MEMS Strain Sensor
This paper describes a technical approach toward the realization of a low-power temperature-compensated micromachined resonant strain sensor. The sensor design is based on two identical and orthogonally-oriented resonators where the differential frequency is utilized to provide an output proportional to the applied strain with temperature compensation achieved to first order. Interface circuits comprising of two front-end oscillators, a mixer, and low-pass filter are designed and fabricated in a standard 0.35-μm CMOS process. The characterized devices demonstrate a scale factor of 2.8 Hz/με over a strain range of 1000 με with excellent linearity over the measurement range. The compensated frequency drift due to temperature is reduced to 4% of the uncompensated value through this scheme. The total continuous power consumption of the strain sensor is 3 μW from a 1.2 V supply. This low power implementation is essential to enable battery-powered or energy harvesting enabled monitoring applications.This work was supported in part by the U.K. Engineering and Physical Sciences Research Council under Grant EP/K000314/1 and in part by the Cambridge Centre for Smart Infrastructure and Construction.This is the author accepted manuscript. The final version is available from IEEE via https://doi.org/10.1109/JMEMS.2016.258786
Epithelial Ovarian Cancer Diagnosis of SecondHarmonic Generation Images: A Semiautomatic Collagen Fibers Quantification Protocol
A vast number of human pathologic conditions are directly or indirectly related to tissular collagen structure remodeling. The nonlinear optical microscopy second-harmonic generation has become a powerful tool for imaging biological tissues with anisotropic hyperpolarized structures, such as collagen. During the past years, several quantification methods to analyze and evaluate these images have been developed. However, automated or semiautomated solutions are necessary to ensure objectivity and reproducibility of such analysis. This work describes automation and improvement methods for calculating the anisotropy (using fast Fourier transform analysis and the gray-level co-occurrence matrix). These were applied to analyze biopsy samples of human ovarian epithelial cancer at different stages of malignancy (mucinous, serous, mixed, and endometrial subtypes). The semiautomation procedure enabled us to design a diagnostic protocol that recognizes between healthy and pathologic tissues, as well as between different tumor types.Fil: Zeitoune, Angel Alberto. Consejo Nacional de Investigaciones CientÃficas y Técnicas. Centro de Investigaciones y Transferencia de Entre RÃos. Universidad Nacional de Entre RÃos. Centro de Investigaciones y Transferencia de Entre RÃos; ArgentinaFil: Luna, Johana S. J.. Universidad Nacional de Entre RÃos. Facultad de IngenierÃa; ArgentinaFil: Sanchez Salas, Kynthia. Universidad Nacional de Entre RÃos. Facultad de IngenierÃa; ArgentinaFil: Erbes, Luciana Ariadna. Consejo Nacional de Investigaciones CientÃficas y Técnicas. Centro de Investigaciones y Transferencia de Entre RÃos. Universidad Nacional de Entre RÃos. Centro de Investigaciones y Transferencia de Entre RÃos; ArgentinaFil: Cesar, Carlos L.. Universidade Federal do Ceará; Brasil. National Institute of Science and Technology on Photonics Applied to Cell Biology; BrasilFil: Andrade, Liliana A. L. A.. Universidade Estadual de Campinas; BrasilFil: Carvahlo, Hernades F.. Universidade Estadual de Campinas; Brasil. National Institute of Science and Technology on Photonics Applied to Cell Biology; BrasilFil: Bottcher Luiz, Fátima. Universidade Estadual de Campinas; Brasil. National Institute of Science and Technology on Photonics Applied to Cell Biology; BrasilFil: Casco, Victor Hugo. Universidad Nacional de Entre RÃos. Facultad de IngenierÃa; ArgentinaFil: Adur, Javier Fernando. Consejo Nacional de Investigaciones CientÃficas y Técnicas. Centro de Investigaciones y Transferencia de Entre RÃos. Universidad Nacional de Entre RÃos. Centro de Investigaciones y Transferencia de Entre RÃos; Argentina. Universidad Nacional de Entre RÃos. Facultad de IngenierÃa; Argentin
BioMaPS: A Roadmap for Success
The manuscript outlines the impact that our National Science Foundation Interdisciplinary Training for Undergraduates in Biological and Mathematical Sciences program, BioMaPS, has had on the students and faculty at Murray State University. This interdisciplinary program teams mathematics and biology undergraduate students with mathematics and biology faculty and has produced research insights and curriculum developments at the intersection of these two disciplines. The goals, structure, achievements, and curriculum initiatives are described in relation to the effects they have had to enhance the study of biomathematics
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