In this paper, we study the pH response of a buried channel SOI MOSFET integrated with a nanofluidic cell. The surface of the device is exposed to solutions of different pH to validate the sensitivity of the device to...
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In this paper, we study the pH response of a buried channel SOI MOSFET integrated with a nanofluidic cell. The surface of the device is exposed to solutions of different pH to validate the sensitivity of the device to different chemical and biological environments.
Er5Si4 is a member of the R5(Si4−xGex) family of alloys, where R=rare earth metal. Many of these compounds display a strong coupling between the magnetic and crystal lattices. In the naturally layered R5(Si4−xGex) mat...
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Er5Si4 is a member of the R5(Si4−xGex) family of alloys, where R=rare earth metal. Many of these compounds display a strong coupling between the magnetic and crystal lattices. In the naturally layered R5(Si4−xGex) materials, inter- and intralayer interactions can be controlled by chemical and physical means; thus their physical properties can be tailored within wide limits. The Er5Si4 is unique in that the temperature dependent structural sequence is opposite that of other representatives of this family. The magnetism of Er5Si4 is reflective of its exceptional place within the series.
Thermal transport properties have been determined for a decagonal Al74Ni10Co16 quasicrystal in the temperature range 373–873 K. Differential scanning calorimetry and a laser flash method were employed in the determin...
Thermal transport properties have been determined for a decagonal Al74Ni10Co16 quasicrystal in the temperature range 373–873 K. Differential scanning calorimetry and a laser flash method were employed in the determination of heat capacity and thermal diffusivity, respectively. Thermal conductivity was determined from the product of diffusivity, heat capacity, and density. A high degree of anisotropy was observed between the aperiodic and periodic axes. The anisotropic heat flow is described using the thermal ellipsoid model. The model was applied to a surface oriented 45° to the major axes and substantiated from bulk measurements obtained from a sample cut along this orientation. Within this temperature range, the thermal transport of this two-dimensional quasicrystal may be described in a manner similar to anisotropic metallic single crystals.
Carbon nanotubes (CNTs) were stabilized in solution through sonication-induced polymerization of acrylated epoxidized soybean oil (AESO) monomer. Transmission electron microscopy and atomic force microscopy showed tha...
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Carbon nanotubes (CNTs) were stabilized in solution through sonication-induced polymerization of acrylated epoxidized soybean oil (AESO) monomer. Transmission electron microscopy and atomic force microscopy showed that the resulting polymer coatings of nanotubes in solution were approximately 10–30 nm in thickness. Raman spectroscopy suggests that AESO intercalates Nanocyl bundles and coats the exterior of HiPco bundles. Using sonication a stable dispersion of as-produced carbon nanotube powder was formed. Mechanical measurements on macroscale composites samples showed modulus enhancement consistent with a lower bound rule of mixtures.
Single-phase Pr5Ni1.9Si3 and PrNi were prepared and characterized by using differential thermal analysis, single crystal, and powder x-ray diffraction. Their thermal and magnetic properties were studied by measuring h...
Single-phase Pr5Ni1.9Si3 and PrNi were prepared and characterized by using differential thermal analysis, single crystal, and powder x-ray diffraction. Their thermal and magnetic properties were studied by measuring heat capacity as a function of temperature in magnetic fields up to 100 kOe and magnetization as a function of magnetic field up to 50 kOe over the temperature range from 5 to 400 K. Pr5Ni1.9Si3 orders magnetically at 50 K, and it undergoes a second transition at 25 K. As inferred from the behavior of the magnetization and magnetocaloric effect (MCE), both ferromagnetic and antiferromagnetic components are present in the magnetic ground state of the material. The heat capacity and magnetocaloric effect of PrNi confirm that it orders ferromagnetically at 19 K. Both Pr5Ni1.9Si3 and PrNi exhibit moderate magnetocaloric effects. The maximum MCE for Pr5Ni1.9Si3 is 3.4 K and it is observed at 50 K for a magnetic field change from 0 to 75 kOe. The maximum MCE for PrNi is 4.2 K, which occurs at 19 K for a magnetic field change from 0 to 100 kOe.
Ni/Al nanostructured multilayer foils were machined with femtosecond pulse-length laser irradiation at various fluences. Scanning electron microscopy, back-scattered electron detection, and atomic force microscopy wer...
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Ni/Al nanostructured multilayer foils were machined with femtosecond pulse-length laser irradiation at various fluences. Scanning electron microscopy, back-scattered electron detection, and atomic force microscopy were used to characterize the resulting laser modified regions. We show that material removal at the micron scale is possible with no ignition of a self-propagation reaction emanating from the irradiated areas, a danger minimized by the fact that the extremely short time duration of the pulse produces negligible heat dissipation into the multilayer system. Nevertheless, initial AFM and BSE results give indication that multilayers may be intermixing and reacting locally in areas smaller than the laser beam diameter, though the exact ignition mechanism is still to be determined.
Design projects and experiments demonstrating mechanics concepts are two ways in which learning can be enhanced in undergraduate mechanics courses. This paper will discuss incorporation of these concepts in two mechan...
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Design projects and experiments demonstrating mechanics concepts are two ways in which learning can be enhanced in undergraduate mechanics courses. This paper will discuss incorporation of these concepts in two mechanics of materials courses at the University of Wisconsin - Madison. Students in an Advanced Mechanics of Materials course were assigned a design project in which they created new table-top demonstrations and classroom experiments for the introductory level Mechanics of Materials course. The design project involved the development and construction of a table-top experiment or demonstration suitable for instruction in Mechanics of Materials. A written report, including instructions for use, descriptions of suggested demonstrations and experiments, and a thorough mechanics analysis of the device constructed, was required. In addition to providing the Advanced Mechanics of Materials students with a good open-ended design experience that reinforced introductory topics and helped the students to develop the advanced skills being studied in the course, some wonderful teaching demonstrations were created for the introductory Mechanics of Materials course. With a minimal supplies budget of $500, students created 9 projects, which addressed topics such as temperature effects, elastoplastic bending, and stress concentration. After the Advanced Mechanics of Materials course was completed, a guide was developed for instructors of the Mechanics of Materials course based on the students' project reports. In later semesters, the table-top demonstrations and classroom experiments served as a teaching aid in two introductory courses on mechanics of materials.
A 50 (or 60 or 70) -minute lecture is inherently incompatible with the typical attention spans of students. The author has developed a teaching technique that successfully re-captures attention in the classroom. The t...
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A 50 (or 60 or 70) -minute lecture is inherently incompatible with the typical attention spans of students. The author has developed a teaching technique that successfully re-captures attention in the classroom. The technique, loosely based on a popular prime-time game show, consists of quizzing a student "on the spot" while allowing a "life-line" of polling the audience for help. The game is enjoyable for students and professor alike, but also allows review, clarification, and reinforcement of concepts. The technique is effective while only requiring minimal preparation and lecture time to be implemented.
The introduction of the Bachelor of Science degree in electrical and electronics engineering technology at Bloomsburg University is discussed. Bloomsburg University is a liberal arts university and the program is uniq...
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The introduction of the Bachelor of Science degree in electrical and electronics engineering technology at Bloomsburg University is discussed. Bloomsburg University is a liberal arts university and the program is unique in the present settings. The reasons for the introduction of such type of course are discussed. The program is designed to both meet the needs of local industries and to achieve accreditation.
A coupled Monte Carlo-diffusion theory model for the criticality analysis of spent fuel lattice configurations was previously presented by Rahnema et al. [1]. The model is based on two-group nodal diffusion in the con...
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