Abstract This paper describes a method for aligning stiff, high-aspect-ratio microcrystals over macro-length scales using polymer fiber drawing process. A composite preform was constructed with an interfacial, liquid shell layer of grapeseed oil suspending ytterbium-doped potassium lutetium fluoride (30% Yb:K 2 LuF 5 , KLF) between adjacent cylindrical surfaces acrylic (polymethyl methacrylate,...

During traditional acupuncture, fine needles are inserted subcutaneously and rotated, which causes loose fascial tissue to wind around the needle. This coupling is stronger at acupuncture points, which tend to fall above intermuscular fascial planes, than control points, which lay above skeletal muscle. These different anatomical constraints may affect the mechanical coupling. Fascia at acupunc...

Silk fibroin (SF) and fiber alignment were introduced into polycaprolactone (PCL)-based electrospun nanofibers as chemical and physical cues for tendon tissue engineering applications. The physicochemical properties of random PCL (RP) nanofibers, random PCL/SF (RPSF) nanofibers and aligned PCL/SF (APSF) nanofibers were characterized for fiber orientation and SF blending effects. An in vitro cel...

Important properties of fiber-reinforced composites, such as stiffness, compression strength, and fatigue resistance, are sensitive to fiber alignment. In this paper, we use structure tensor analysis on CT images characterize the orientations in three samples unidirectional composites: pultruded carbon, pre-preg non-crimp glass fabric. Our results show that fibers sample more aligned than two o...

Date The final copy of this thesis has been examined by the signatories, and we find that both the content and the form meet acceptable presentation standards of scholarly work in the above mentioned discipline. Photopolymer Waveguide to Fiber Coupling via 3D Direct-Write Lithography Thesis directed by Professor Robert R. McLeod This thesis proposes and demonstrates a novel method of pigtailing...

Numerical simulations of fiber orientation in short-fiber composites have relied on the Folgar and Tucker (1984) model for diffusion for over twenty years. Unfortunately, it has recently been shown that this fiber collision model tends to over-predict the rate of alignment; exposing the need for a new fundamental approach to more accurately capture fiber interactions within the melt flow. Here ...

We present the results of the experimental study and comparison of Yb-free, Erdoped, all-fiber, alignment free, single frequency (SF) fiber amplifiers operating under 980-, 1470and 1530-nm pumping for the coreand clad-pumping architectures. In the single-mode core-pumped configuration Er-doped fiber amplifiers demonstrated 52% and 60% pump to output efficiencies for 980 and 1480 nm pump wavelen...