Results 141 to 150 of about 42,750 (297)

Crossing the c=1 barrier in 2D Lorentzian quantum gravity

, 1999
In an extension of earlier work we investigate the behaviour of two-dimensional Lorentzian quantum gravity under coupling to a conformal field theory with c > 1.
Ambjørn, J., Anagnostopoulos, K.N., Loll, Renate, Anagnostopoulos, K, Ambjörn, Jan, Anagnostopoulos, K. N., Ambjørn, Jan, Ambjörn, J., Anagnostopoulos, K., Loll, R, Ambjørn, J, Loll, R.   +11 more
core   +1 more source

An Accessible Microfluidic Platform for the Generation of Polarized Brain Organoids

Advanced Materials Technologies, EarlyView.
This study presents an accessible double‐gradient microfluidic device that enables controlled morphogen delivery and spatially polarized differentiation in brain organoids. By integrating a pump‐free design and stable fabrication method, the platform generates dorsal–ventral neuronal asymmetry, offering a reproducible and versatile approach to model ...
Daniel Pérez‐Calixto, Manuel Alejandro Vazquez Valle, Mitzi Pérez‐Calixto, Cindy Peto‐Gutiérrez, Iván Velasco, Genaro Vázquez‐Victorio, Itzel Escobedo‐Avila   +6 more
wiley   +1 more source

Proper time is stochastic time in 2d quantum gravity

, 2009
We show that proper time, when defined in the quantum theory of 2d gravity, becomes identical to the stochastic time associated with the stochastic quantization of space.
Zohren, S, Zohren, Stefan, Ambjorn, J, Loll, R, Watabiki, Y, Westra, W   +5 more
core  

Fully 3D‐Printed Wave‐Wound Electromagnetic Motors

Advanced Materials Technologies, EarlyView.
This work presents the first fully 3D‐printed wave‐wound electromagnetic motors, which are created using conductive nanoparticle inks, carbon‐filled nylon polymers, and surface mount components. These motors can achieve a stall torque of 7.62N·mmA−1$7.62 \nobreakspace N{\cdot }mm A^{-1}$ and efficiency of 28.2 %, which approaches the performance of ...
Joseph Schwalbe, Sebastian Mettes, Eduardo Francke, Kenneth W. Allen, Yi Chen Mazumdar   +4 more
wiley   +1 more source

Multi-resolution analysis of gravity anomalies: A comparative study of modern and spherical approximation techniques

Nova Geodesia
Analysing gravity anomalies is a key method of understanding the Earth’s shape, structure, and subsurface composition. This is done by modeling the Geoid, an irregular surface, into a regular sphere or ellipsoid for easy computations.
Kolawole S. ILESANMI, Herbert TATA, Ifechukwu U. NZELIBE, Timothy O. IDOWU   +3 more
doaj   +1 more source

3D Printed Omniphobic Slippery Liquid Infused Porous Surfaces for Low Surface Tension Repellency

Advanced Materials Technologies, EarlyView.
A 3D printing strategy fabricates omniphobic slippery liquid‐infused porous structures with lubricant reservoirs and interconnected microchannels. A post‐printing surface treatment modifies the porous surface to ensure compatibility with the infused fluorinated lubricant.
Noa Trink, Shlomo Magdassi
wiley   +1 more source

Euclidian 2D Gravity with Torsion

, 1993
Closing a gap in the literature on the subject, the local solutions of 2D-gravity with torsion are given for Euclidian signature. For the topology of a cylinder the system is quantized.
Schaller, P., Strobl, T.
openaire   +2 more sources

3D Carrollian gravity from 2D Euclidean symmetry

Carroll symmetry arises from Poincaré symmetry when the speed of light is sent to zero. In this work, we apply the Lie algebra expansion method to find the Carroll versions of different gravity models in three space-time dimensions. Our starting point is
Sebastián Salgado, Patrick Concha, Evelyn Rodríguez, Dra. Rodríguez-Durán, Evelyn, Dr. Concha-Aguilera, Patrick, Salgado, Sebastián   +5 more
core   +1 more source

Magnetic Droplet Manipulation on Open Surfaces

Advanced Materials Technologies, EarlyView.
Recent advances in the manipulation of magnetic droplets demonstrate various manipulations on open surfaces, including transport, splitting, merging, and force‐controlled motion, enabled by magnetic particles and external fields. ABSTRACT Manipulation of liquids on a smaller scale enables applications in various fields, particularly diagnostics and ...
Robab Jahangir, Vahid Nasirimarekani
wiley   +1 more source

Buckling‐Driven Linearity in Flexible Capacitive Pressure Sensors Based on a Three‐Dimensional Dual‐Pore Polyurethane Structure

Advanced Materials Technologies, EarlyView.
A flexible pressure sensor utilizing a 3D dual‐pore polyurethane structure is developed to overcome the intrinsic trade‐off between sensitivity and linearity. By inducing sequential buckling through distinct pore sizes and shapes, the device achieves highly linear and sensitive responses across a wide pressure range.
Jae Yeong Jang, Jaemin Choi, Young Jung
wiley   +1 more source