A5043584375- Glass properties and applications
- Material Dynamics and Properties
- Solid State Laser Technologies
- Luminescence Properties of Advanced Materials
- Geological and Geochemical Analysis
- Ferroelectric and Piezoelectric Materials
- Crystallization and Solubility Studies
- Nuclear materials and radiation effects
- Laser Material Processing Techniques
- Mineralogy and Gemology Studies
- Metallic Glasses and Amorphous Alloys
- Advancements in Photolithography Techniques
- Photorefractive and Nonlinear Optics
- High-pressure geophysics and materials
- Ocular and Laser Science Research
- Advanced Surface Polishing Techniques
- Technology Assessment and Management
- Phase-change materials and chalcogenides
- Semiconductor materials and devices
- Advanced Fiber Optic Sensors
- Welding Techniques and Residual Stresses
- Quality and Safety in Healthcare
- Advanced ceramic materials synthesis
- 3D IC and TSV technologies
- Thermal and Kinetic Analysis
Rochester Institute of Technology
2024
Miami University
2024
Beihang University
2024
Texas Health Dallas
2006-2015
Schott (Germany)
2014
Mologic (United Kingdom)
2012
Yale University
1992-2002
American Ceramic Society
2001
University of Southern California
1994
Sandia National Laboratories California
1979
Glass-ceramics are noted for their unusual combination of properties and manifold commercialized products consumer specialized markets. Evolution novel glass ceramic processing routes, a plethora new compositions, unique exotic nano- microstructures over the past 60 years led us to review definition glass-ceramics. Well-established emerging methods, such as co-firing, additive manufacturing, laser patterning analyzed concerning core requirements glass-ceramics performance final products. In...
Steady-state rates and induction times for crystal nucleation in lithium disilicate melt depend exponentially on water content (up to 975 ppm). Time-dependent number densities exhibit self-similar behavior as a function of content, thereby allowing description all data by universal curve. This provides powerful tool predicting crystallization histories, implies that mechanisms involved are accelerated water, suggests no new reaction pathways arise with the addition water. The influence...
Engineering has been playing an important role in serving and advancing healthcare. The term "Healthcare Engineering" used by professional societies, universities, scientific authors, the healthcare industry for decades. However, definition of remains ambiguous. purpose this position paper is to present a Healthcare as academic discipline, area research, field specialty, profession. defined terms what it is, who performs it, where performed, how including its purpose, scope, topics, synergy,...
Much has been said about the Extended Enterprise and benefits which it can bring to today's industrial environment. Yet we still see very few examples of extended enterprises in practice particular information infrastructures support inter-enterprise communications. One reasons identified for this, is lack a standardised communications medium enable seamless co-ordination exchange across enterprises. It widely agreed that efficient use technology make concept enterprise reality. The...
Experiments reported herein document heterogeneous crystal nucleation on bubbles in supercooled lithium disilicate melt. Crystalline (Li2Si2O5) nucleated and grew small (∼1 μm) with a one-to-one correspondence between the number of crystals (ranging from <102 to ∼105 bubbles/mm3). Crystals large (>100 only samples fused N2, suggesting chemical control nucleating efficiency. Bubbles ∼1 μm diameter served as sites for polycrystalline spherulites; smaller than more common ellipsoidal...
An increased need for high‐temperature piezoelectric materials sensors, some of which must be Pb free due to RoHS regulations, has led a focused search suitable materials. Glass–ceramic processing—the controlled crystallization precursor glass—offers unique manner in produce partially wholly crystalline, Pb‐free, and temperature‐stable starting with optically homogeneous amorphous Building on previously published work, we have produced NaNbO 3 ‐containing, poled, pore‐free ferroelectric...
Abstract The mechanical response of multicomponent borosilicate glasses has drawn significant attention in the design damage‐resistant glasses. In this work, we investigate plasticity two glasses, Borofloat ® 33 (Boro33) and N‐BK7 , by implementing a uniaxial tension test using molecular dynamics simulations. A bond‐switching mechanism is found to be responsible for plastic both governed increasing rate non‐bridging oxygen (NBO) production during tension. We that amount B 4 OSi linkages...
Numerical simulations are presented that document the strong effect of a previously underappreciated portion two‐stage thermal treatments used in study nucleation processes: “heat‐up” process whereby samples heated from “nucleation” conditions to “growth” conditions. The indicate two limiting regimes exist, dependent on (a) cluster size distribution as‐quenched glasses, (b) temperatures for and growth, (c) rates heating cooling: (1) all clusters larger than critical at growth ( n * gr ) will...
High strain‐rate (~10 7 /s), spall‐threshold results obtained via laser‐shock testing are reported for three glasses (fused silica, soda‐lime “float” glass, and a borosilicate); such tests should be immune to the influence of surface flaws as plane failure is not localized at surface. Whereas measured spall thresholds (1–2 GPa, accounting wave attenuation) agree reasonably well with conventional, flyer‐plate shock‐wave experiments, they 5–10 times lower than “intrinsic” strength values from...
We have used a numerical treatment to investigate time‐dependent phenomena associated with transient crystal nucleation in model silicate melt. Our approach is the first explicitly account for both thermodynamic (surface and bulk free energies) kinetic (equilibrium nonequilibrium transport) driving forces molten silicates. The degree of undercooling, behavior, structural relaxation effects are included our model. can simulate variety natural processes, ranging from rapid cooling fragmenting...
Differential thermal analysis (DTA) experiments described herein apply two methodologies by which to estimate absolute nucleation rates and/or temperature dependencies using a low‐expansion, commercially relevant, multicomponent glass‐ceramic as test material. In particular, the Marotta and Ray et al. methods were applied Zerodur® both provided valuable insight into relatively complicated crystallization process. Previous crystal growth rate data used in comparative manner. Although method...
Barium titanosilicates are possible oxide forms for the immobilization of short‐lived fission products in radioactive waste. Ba 2 TiSi O 8 (fresnoite) and BaTiSiO 5 (Ba‐titanite) samples were prepared by a solid‐state synthesis. The enthalpies formation crystal glass at 25°C obtained from drop solution calorimetry molten lead borate (2PbO–B 3 ) solvent 701°C. enthalpy fresnoite composition constituent oxides was exothermic became more with increasing crystallinity. Differential scanning...
We discuss glass as an engineered material in its traditional role to control the propagation of and spectrally modify light performance optical functions. Next, we consider fluorescence, which provides capability convert absorbed a particular frequency emitted lower necessary condition for amplification through spontaneous emission radiation. Finally, framework high‐energy particle physics experiments, including use scintillator Cerenkov radiation detector.
The glass ceramic ZERODUR® from SCHOTT has an excellent reputation as mirror blank material for earthbound and space telescope applications. It is known its extremely low coefficient of thermal expansion (CTE) at room temperature CTE homogeneity. Recent improvements in CNC machining allow achieving light weighted substrates up to 90% incorporating very thin ribs face sheets. In 2012 new grades EXPANSION CLASS 0 SPECIAL EXTREME have been released that offer the tightest ever. With TAILORED it...
This paper focuses on the three main effects that can induce wave-front distortion due to thermal lensing in laser gain media: 1) thermo-optic (<i>dn/dT</i>); 2) stress-optic; and 3) surface deformation (e.g., "end-bulging" of a rod). Considering simple case side-pumped cylindrical rod which is air- or water-cooled along its length, internal temperature distribution has long been known assume parabolic profile. Resulting from this are two induced refractive index variations stress-optic also...