Mechanics of fracture and flexure in Antarctic ice sheets and ice shelves by Zhang, H

“…In grounding zones and floating ice shelves, ice fracturing is often associated with flexure modulated by ocean tides and subglacial water flow, as well as stresses created by shearing, such as pinning points. Fracture and flexure significantly affect the vulnerability of Antarctic ice shelves to hydrofracturing and, by altering buttressing effects, the mass balance of the entire Antarctic Ice Sheet. …”

Synthesis of α-methylene-δ-valerolactone and its selective polymerization from a product mixture for concurrent separation and polymer production by Khechfe, Alexander A, Eckstrom, Francesca D, Chokkapu, Eswara Rao, Baston, Lucas A, Liu, Bowei, Chen, Eugene Y-X, Román-Leshkov, Yuriy

“…Using a model mixture of 30 wt% of MVL in DVL, vinyl-addition polymerization converted MVL to the corresponding vinyl polymer (PMVL)VAP in 98% yield, while DVL was recovered in 96% yield by distillation. Alternatively, ring-opening polymerization of the same mixture resulted in a DVL/MVL copolyester and separatable vinyl homopolymer P(MVL)VAP.…”
Get full text

Biochemical Analysis of Poly(ethylene terephthalate) Film Degradation Kinetics of Engineered IsPETase Variants by Zhong-Johnson, En Ze Linda

“…I developed a kinetic assay based on spectrophotometric measurements of UVabsorbance of the products in the reaction supernatant, as degradation products harboring the benzene ring will absorb between 240-280 nm. The method was found to be reliable to obtain relative measurements of initial reaction rates but cannot be used to determine the absolute concentration of products in the supernatant. …”
Get full text

Synthesis of biomimetic co-polypeptides with tunable degrees of phosphorylation by Lipik, Vitali, Zhang, Lihong, Miserez, Ali

“…Here, we present a co-polypeptide synthesis strategy based on the Ring-Opening Polymerization (ROP) of N-carboxyanhydrides (NCAs), followed by controlled phosphorylation of serine (Ser) residues. …”
Get full text
Get full text

Tunable quantum cascade lasers for midinfrared spectroscopic sensing by Li, Jinghao

“…Finally, we design a novel tunable QCL based on coupled ring resonator filters. The fabricated device achieves a quasi-continuous tuning range of ~ 18 cm^-1 around 7.4 µm by varying heatsink temperature.…”
Get full text

Experimental investigation of impact response of composite plates/panels by Gan, Jia Li

“…Damage patterns in the acrylic sheet include radial and ring cracks and, together with slight delamination at the interface, which may cause peeling-off of acrylic material from the sandwich plate. …”
Get full text

Indefinite metamaterials for optical applications by Bisht, Ankit

“…Using full-wave Finite-difference time-domain (FDTD) simulations with diffraction limited trimer, quadrumer and ringed objects etched on thin perfect electric conductor (PEC) films, we show that the hyperlens model can achieve magnification factors of up to 10X in the far-field (~4.5λ from object’s surface) under a light source with a wavelength of 1 μm, with successful resolution down to 220 nm (~λ/5). …”
Get full text

Two kinds of phase transition in photonic systems with application to optical isolation by Zhou, Xin

“…We study three representative designs: (i) a waveguide array implementing a nonlinear 1D Su-Schrieffer-Heeger model, (ii) a waveguide array implementing a nonlinear 2D Haldane model, and (iii) a 2D lattice of coupled-ring waveguides. In the first two cases, we find a correspondence between the topological transition of the underlying linear lattice and the power threshold of the transmittance, and show that the transmission behavior is attributable to the emergence of a self-induced topological soliton. …”
Get full text
Get full text

Controlling selectivity in the reductive activation of CO2 by mixed sandwich uranium(iii) complexes by Tsoureas, N, Castro, L, Kilpatrick, A, Cloke, FGN, Maron, L

“…The nature of the R group on the cyclopentadienyl ring in the former has a significant effect on the outcome of CO2 activation: when R = Me, the products are the bridging oxo complex {U[η8-C8H6(1,4-SiMe3)2](η5-CpMe5)}2(μ-O) and the bridging oxalate complex {U[η8-C8H6(1,4-SiMe3)2](η5-CpMe5)}2(μ-η2:η2-C2O4); for R = Et or iPr, bridging carbonate {U[η8-C8H6(1,4-SiMe3)2](η5-CpMe4R)}2(μ-η1:η2-CO3) and bridging oxalate complexes {U[η8-C8H6(1,4-SiMe3)2](η5-CpMe4R)}2(μ-η2:η2-C2O4) are formed in both cases; and when R = tBu the sole product is the bridging carbonate complex {U[η8-C8H6(1,4-SiMe3)2](η5-CpMe4tBu)}2(μ-η1:η2-CO3). …”

Distinct Circle of Willis anatomical configurations in healthy preterm born adults: a 3D time-of-flight magnetic resonance angiography study by Greggio, J, Malamateniou, C, Baruteau, KP, Reyes-Aldasoro, CC, Huckstep, OJ, Francis, JM, Williamson, W, Leeson, P, Lewandowski, AJ, Lapidaire, W

“…This study aims to explore potential differences in the Circle of Willis (CoW), a key arterial ring that perfuses the brain, of healthy adults born preterm. …”

Design and Synthesis of Stimuli-Responsive Polymers with Programmable Cleavability by Zafar, Hadiqa

“…The fourth chapter thus provides detailed background on the current plastic waste outlook, vinyl polymers and their synthesis, radical ring-opening polymerization, and current approaches to cleavable comonomers and the end-of-life options they offer commodity polymers. …”
Get full text

Structural analysis and insights into the glycon specificity of the rice GH1 Os7BGlu26 β-D-mannosidase by Robinson, Robert Charles, Tankrathok, Anupong, Iglesias-Fernández, Javier, Luang, Sukanya, Kimura, Atsuo, Rovira, Carme, Hrmova, Maria, Ketudat Cairns, James R.

“…Docking of the 1S3, 1S5, 2SO and 3S1 pyranose-ring conformations of 4NPMan and 4NPGlc substrates into the active site of Os7BGlu26 indicated that the lowest energies were in the 1S5 and 1S3 skew-boat conformations. …”
Get full text
Get full text

Analysis and design of curved steel beam member in elevation using Eurocode 3 by Yandarmadi, Kelvin

“…This paper specifically focuses on analysing simply supported boundary condition curved beam member which pinned on the one end and roller that can be moved horizontally on the other end. …”
Get full text

100 THz optical switching with plasmonic metamaterial by Venkatram, Nalla, Stefano, Vezzol, João, Valente, Sun, Handong, Nikolay, Zheludev

“…In this paper we evaluate the effect of plasmonic finite response time on the coherent perfect absorption process for a plasmonic metamaterial absorber, based on asymmetric split ring resonators. We study the coherent modulation of the total energy as a function of the pulse duration, down to 6 fs. …”
Get full text
Get full text
Get full text

Interplay of Transition Metals and Noncovalent Interactions in C–H Activation Catalysis by Vennelakanti, Vyshnavi

“…These enzymes catalyze a variety of reactions including C–H halogenation, hydroxylation, epoxidation, and ring closures, several of which are mediated with the help of noncovalent interactions such as hydrogen bonds (HBs). …”
Get full text

Circularly polarized antennas and phased arrays for 5G applications by Hu, Yiyun

“…This unit is improved based on the off-center fed folded long dipole by introducing the half-ring structure, which could make the unit more suitable for beam scanning arrays. …”
Get full text

Challenges and applications to operando and in situ TEM imaging and spectroscopic capabilities in a cryogenic temperature range by Tyukalova, Elizaveta, Vas, Joseph Vimal, Ignatans, Reinis, Mueller, Aaron David, Medwal, Rohit, Imamura, Masaaki, Asada, Hironori, Fukuma, Yasuhiro, Rawat, Rajdeep Singh, Tileli, Vasiliki, Duchamp, Martial

“…Such studies are promising for studying the pinning of the ferroelectric and magnetic domains versus temperature, spin-polarized current, and externally applied magnetic field to better manipulate the domain walls. …”
Get full text

Early detection of reduced artemisinin susceptibility in plasmodium falciparum using novel phenotypic indicators by Xiong, Aoli

“…Currently the most widely used methods for the detection of artemisinin resistance include parasites clearance rate measurements, the ring-stage survival assay (RSA) and DNA based approaches to detect mutations in the K13-propeller gene. …”
Get full text
Get full text

Design and investigation of block copolymers for dispersion of carbon nanotubes in polymer matrices by Liu, Chengyin

“…To further improve the tensile properties of the SWNTs/epoxy nanocomposites, we fabricated another series of PI-derived block copolymers via ring-opening polymerization initiated from hydroxyl-terminated polyimide of lactide and allyl-bearing 2-methyl-2-(allyloxycarbonyl)propylene carbonate) (MAC) to produce PLA-b-PI-b-PLA (TB1) and PMAC-b-PI-b-PMAC (TB2) which are polyester and poly(ester-carbonate)-derived, respectively. …”
Get full text

Structure and functions of a metallo-beta-lactamase- like hypothetical protein bleg1_2437 from alkali-tolerant soil bacterium Bacillus lehensis G1 by Tan, Soo Huei

“…However, the emergence of antibiotic resistance mechanism among pathogenic bacteria has downsized the efficacy of antibiotics via the production metallo-β-lactamase (MBL) which enables pathogens to destroy the β- lactam ring of β-lactam antibiotics. Although MBL is not ubiquitously found in all pathogenic bacteria, its presence is a public health concern. …”
Get full text