Results 31 to 40 of about 5,903 (308)

Parallelism and concurrency of graph manipulations

Theoretical Computer Science, 1980
AbstractGraph manipulations are formalized as graph derivations within the framework of graph grammar theory. In this paper we generalize recently published ‘Church–Rosser’ and ‘Parallelism’ Theorems for graph derivations. Given a ‘sequential independent’ sequence of graph derivations G⇒H ⇒X the Parallelism Theorem states that there is also a ...
Hartmut Ehrig, Barry K. Rosen
openaire   +2 more sources

Direct Position Analysis of a Large Family of Spherical and Planar Parallel Manipulators with Four Loops [PDF]

, 2008
Presentado al 2nd International Workshop on: "Fundamental Issues and Future Research Directions for Parallel Mechanisms and Manipulators" celebrado en Montpellier (Francia) del 21 al 22 de septiembre de 2008.The direct position analysis (DPA) of a ...
Gregorio, Raffaele di, Borràs Sol, Júlia, Di Gregorio, Raffaele, Borràs, Julia, J. Borras   +4 more
core   +2 more sources

Model-based control of axisymmetric hexarot parallel manipulators

Results in Control and Optimization, 2022
In this research, the control of a hexarot parallel mechanism is investigated. Parallel kinematic simulators or machine tools manipulators suffer from many problems to have a good motion tracking.
Siamak Pedrammehr, Mohammad Reza Chalak Qazani, Houshyar Asadi, Mir Mohammad Ettefagh, Saeid Nahavandi   +4 more
doaj   +1 more source

Therapeutic Apheresis in Nigeria: A Multi‐Center Summary of Abstracts From the Inaugural Nigerian Society for Apheresis Scientific Meeting

Therapeutic Apheresis and Dialysis, EarlyView.
ABSTRACT Background Therapeutic apheresis (TA) is an established treatment modality for hematologic, neurologic, and immunologic disorders, yet access remains severely limited in sub‐Saharan Africa. Donor apheresis, including platelet apheresis collection from healthy donors, represents an important complementary modality supporting blood product ...
Nosa Bazuaye, Chimezie Okwuonu, Evelyn Idam, Folasade Adelekan‐Popoola, Shakirat Gold‐Olufadi, Olufunto Olufela Kalejaiye, Abdullateef Ogala, Zinnah Aloziem, Blossom Amamchukwu, Patience Elimia, Mkpoikanabasi Obot‐Obot, Henry Mbakwe, Praises Maduagwuna, Olatunji Akinrodoye, Chiamaka Anyanwu, Benjamin Anyanwu, Adedamola Akinsiku, Oluwatoyin A. Akinsiku, Muzamil O. Hassan, Fatiu A. Arogundade, Olalekan E. Ojo, Homayemem Weli, Jesupelumi Adenihun, Aderemi Adelaja, Ebun Bamgboye, Olalekan Olatise, Ade E. Faponle, Ayoola Odeyemi, Michael Muoka, Stephen Asaolu, Qudrat Busari, Blessing Dawudu, Michael Naiyeju, Rasheed A. Balogun   +33 more
wiley   +1 more source

Leistungsbewertung von Parallelmanipulatoren: Kraftübertragungsgüte von planaren Parallelmanipulatoren [PDF]

, 2022
S.117-122This paper concerns the problem of performance evaluation of parallel manipulators. Although parallel manipulators have been extensively studied for more than twenty years, unfortunately, the concepts of manipulability and condition number were,
Wabner, M., Neugebauer, Reimund, Liu, X.-J., Wang, J.   +3 more
core  

Full Forward Kinematics of Lower-Mobility Planar Parallel Continuum Robots

Mathematics
In rigid lower-mobility parallel manipulators the motion of the end-effector is partially constrained due to a combination of passive kinematic pairs and rigid components.
Oscar Altuzarra, Mónica Urizar, Kerman Bilbao, Alfonso Hernández   +3 more
doaj   +1 more source

Position-Singularity Analysis of a Class of the 3/6-Gough-Stewart Manipulators Based on Singularity-Equivalent-Mechanism

International Journal of Advanced Robotic Systems, 2012
This paper addresses the problem of identifying the property of the singularity loci of a class of 3/6-Gough-Stewart manipulators for general orientations in which the moving platform is an equilateral triangle and the base is a semiregular hexagon ...
Hui Zhou, Yi Cao, Baokun Li, Meiping Wu, Jinghu Yu, Haiwei Chen   +5 more
doaj   +1 more source

Establishing an Apheresis Medicine Program in a Resource‐Constrained Setting: A 5‐Year Experience From Lagos, Nigeria

Therapeutic Apheresis and Dialysis, EarlyView.
ABSTRACT Background Establishing a comprehensive apheresis medicine program in a resource‐constrained setting presents significant structural, financial, and logistical challenges. Despite the growing clinical importance of apheresis services globally, published experience from sub‐Saharan Africa remains sparse.
Folasade Adelekan‐Popoola, Shakirat Gold‐Olufadi, Olufunto Olufela Kalejaiye, Abdullateef Ogala, Rasheed A. Balogun   +4 more
wiley   +1 more source

Study of error modeling in kinematic calibration of parallel manipulators

International Journal of Advanced Robotic Systems, 2016
Error modeling is the foundation of a kinematic calibration which is a main approach to assure the accuracy of parallel manipulators. This article investigates the influence of error model on the kinematic calibration of parallel manipulators.
Liping Wang, Yuzhe Liu, Jun Wu, Jinsong Wang, Binbin Zhang   +4 more
doaj   +1 more source

Reciprocal control of viral infection and phosphoinositide dynamics

FEBS Letters, EarlyView.
Phosphoinositides, although scarce, regulate key cellular processes, including membrane dynamics and signaling. Viruses exploit these lipids to support their entry, replication, assembly, and egress. The central role of phosphoinositides in infection highlights phosphoinositide metabolism as a promising antiviral target.
Marie Déborah Bancilhon, Bruno Mesmin
wiley   +1 more source