Results 21 to 30 of about 706,046 (321)

A Lower-Back Exoskeleton With a Four-Bar Linkage Structure for Providing Extensor Moment and Lumbar Traction Force

open access: yesIEEE Transactions on Neural Systems and Rehabilitation Engineering, 2022
Lower back pain and related injuries are prevalent and serious problems in various industries, and high compression force to the lumbosacral (L5/S1) region has been known as one of the key factors.
Chaerim Moon   +3 more
doaj   +1 more source

Kinematics analysis of a four-legged heavy-duty robot with a force–position hybrid control servo actuator in a parallel-executed cylinder system [PDF]

open access: yesMechanical Sciences, 2021
In this research, an electrohydraulic servo four-legged heavy-duty (FLHD) robot has been designed and developed. The study proposes an integration layout cylinder design scheme for a non-lightweight hydraulic servo four-legged robot with high loads and ...
G. Wang, X. Wang, Y. Wang, B. Fu
doaj   +1 more source

Derivations of relativistic force transformation equations [PDF]

open access: yes, 2011
The correct general form of relativistic transformation equations for the three-vector force is derived without using four-vectors, via the relativistic Newton's second law. The four-vector approach to the problem is also presented.
Davidovic, Dragomir   +2 more
core   +1 more source

Star Formation with Adaptive Mesh Refinement Radiation Hydrodynamics [PDF]

open access: yes, 2010
I provide a pedagogic review of adaptive mesh refinement (AMR) radiation hydrodynamics (RHD) methods and codes used in simulations of star formation, at a level suitable for researchers who are not computational experts.
Commerçon   +9 more
core   +1 more source

Expanding Space: the Root of all Evil? [PDF]

open access: yes, 2007
While it remains the staple of virtually all cosmological teaching, the concept of expanding space in explaining the increasing separation of galaxies has recently come under fire as a dangerous idea whose application leads to the development of ...
Chodorowski   +10 more
core   +1 more source

Hot spots based gold nanostar@SiO2@CdSe/ZnS quantum dots complex with strong fluorescence enhancement

open access: yesAIP Advances, 2018
In this paper, a novel gold nanostar (NS)@SiO2@CdSe/ZnS quantum dots (QDs) complex with plasmon-enhanced fluorescence synthesized using a step-by-step surface linkage method was presented. The gold NS was synthesized by the seed growth method.
Feng Shan   +4 more
doaj   +1 more source

Medical Robotic Bed to Prevent Pressure Sores

open access: yesApplied Sciences, 2021
Patients who stay in bed for long periods are prone to pressure sores. Pressure sores cause multiple complications and prolong hospitalization. To prevent pressure sores, the patient’s lying position must be changed continuously so that excessive ...
Minju Seon, Youngdae Lee, Chanwoo Moon
doaj   +1 more source

Experimental Study on the Breaking Ability of the Cutting Angle of Conical Picks [PDF]

open access: yesMATEC Web of Conferences, 2020
This Effects of cutting angle of conical picks affecting on rock breaking capacity was researched to calculate the low construction efficiency of the conical picks at hard rock cutting.
Kang K. X., He B., Wang S. J.
doaj   +1 more source

A New Algorithm for 2-D Transport for Astrophysical Simulations: I. General Formulation and Tests for the 1-D Spherical Case [PDF]

open access: yes, 2006
We derive new equations using the mixed-frame approach for one- and two-dimensional (axisymmetric) time-dependent radiation transport and the associated couplings with matter.
Burrows, Adam, Hubeny, Ivan
core   +2 more sources

Comparative evaluation of biting force and chewing efficiency of all-on-four treatment concept with other treatment modalities in completely edentulous individuals

open access: yesThe Journal of Indian Prosthodontic Society, 2020
Aim: To compare and evaluate biting force and chewing efficiency of all-on-four treatment concept, implant-supported overdenture, and conventional complete denture. Settings and Design: Invivo – comparative study.
Romesh Soni   +4 more
doaj   +1 more source

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