Results 181 to 190 of about 155,574 (308)

Trade Costs and Economic Development [PDF]

We test the hypothesis of the circular causality between trade costs and degree of economic development using data on Italian provinces. Using different methods to control for multilateral resistance, we apply a gravity equation to estimate sectoral ...
Michele Fratianni, Francesco Marchionne
core  

Simulated microgravity alters sperm navigation, fertilization and embryo development in mammals. [PDF]

Commun Biol
Lyons HE, Nikitaras V, Arman BM, McIlfatrick SM, Nottle MB, Gonzalez MB, McPherson NO.   +6 more
europepmc   +1 more source

Origami‐Inspired Structural Design for Aquatic‐Terrestrial Amphibious Robots

Advanced Robotics Research, EarlyView.
This work presents a lightweight amphibious origami robot actuated by a single shape memory alloy wire. A rigid foldable origami structure with displacement amplification enables efficient terrestrial crawling and aquatic swimming. The addition of fan‐shaped units allows controllable turning in both environments.
Weiqi Liu, Chunlong Wang, Xiaohang Sun, Hongwei Guo, Jiayao Ma, Yan Chen   +5 more
wiley   +1 more source

Synthesis of Magnetic Hyperbranched Star Chain Nanopolymer and Its Application in ASP Flooding Wastewater Treatment. [PDF]

Molecules
Qiao S, Cui L, Cai L, Fan Z.
europepmc   +1 more source

A Soft Robotic Fish With a Dielectric Elastomer Actuator Body and Negative Stiffness Spine

Advanced Robotics Research, EarlyView.
This work introduces a bio‐mimetic soft robotic fish driven by fiber‐reinforced dielectric elastomer actuators integrated as its body. By prestretching this active skin against a flexible spine, a negative stiffness system is created, enabling large‐amplitude bending.
Markus Koenigsdorff, Simon Holzer, Stefania Konstantinidi, Yoan Civet, Yves Perriard   +4 more
wiley   +1 more source

Estimating Gravity Models of International Trade with Correlated Time-Fixed Regressors: To IV or not IV?

Gravity type models are widely used in international economics. In these models the inclusion of time-fixed regressors like geographical or cultural distance, language and institutional (dummy) variables is often of vital importance e.g.
Mitze, Timo
core  

Effects of altered gravity on adrenergic-mediated cAMP signalling in intact cells. [PDF]

NPJ Microgravity
Bathe-Peters M, Sohail I, Sirbu A, Schneider K, Patriarchi T, Anilkumar A, Lichterfeld Y, Liemersdorf C, de Lanerolle P, Annibale P.   +9 more
europepmc   +1 more source

Robotic Control for Human–Robot Collaborative Assembly Based on Digital Human Model and Reinforcement Learning

Advanced Robotics Research, EarlyView.
This work presents a robotic control method for human–robot collaborative assembly based on a biomechanics‐constrained digital human model. Reinforcement learning is used to generate physiologically plausible human motion trajectories, which are integrated into a virtual environment for robot control learning.
Bitao Yao, Hongzhou Ai, Wenjun Xu, Zude Zhou, Lihui Wang   +4 more
wiley   +1 more source

Gravity-sensing device for measuring bending angles in digestive endoscopes: Design and clinical evaluation. [PDF]

Endosc Int Open
Luo MY, Liu LQ, Lun ZX, Huang CY, Chen XC, Huang Y, Fu ZL, Zhou CK, Yang H, Zhang W.   +9 more
europepmc   +1 more source

Efficient and Robust Standing Postures of Quadruped Robots

Advanced Robotics Research, EarlyView.
A calibrated static framework estimates load, optimizes torques, and adapts posture so quadruped robots stand efficiently and robustly under external payloads, achieving up to 50% lower torque demand. Inspired by the natural posture adjustments of animals under external loading, this article presents an optimization‐based framework for minimizing joint
Mohamad Kanaan, Hamza Jomaa, Jack Challita, Kawthar Zaidan, Riad Saab, Hussein Hussein   +5 more
wiley   +1 more source