A new linear microactuator, using bulk PZT and electro-discharge-machined components, generates a sliding velocity and force of 100 mm/s and 12 mN, respectively, in either direction, and a peak velocity and force of 212 mm/s and 44 mN, respectively. Using a simple combination of two slightly different beams placed in contact with a slider, and vibrated at two different resonance frequencies, 508 and 522 kHz, by a specially designed, axially vibrating piezoelectric element, bidirectional linear motion was obtained. By simply reducing the length of the applied signal, the sliding distance was reduced to 90 nm +/- 2 nm, which could be improved with a variety of control methods. The design offers not only silent operation, slider clamping upon removal of power, and all of the other advantages of piezoelectric actuators, but also the potential to be further reduced in size to sub-mm3 for microrobotics and other applications.
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http://dx.doi.org/10.1109/tuffc.2006.1642514 | DOI Listing |
J Neurosci
January 2025
The Neuroscience Graduate Program, The Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, USA
Reciprocal neuronal connections exist between the internal organs of the body and the nervous system. These projections to and from the viscera play an essential role in maintaining and finetuning organ responses in order to sustain homeostasis and allostasis. Functional maps of brain regions participating in this bidirectional communication have been previously studied in awake humans and anesthetized rodents.
View Article and Find Full Text PDFEcotoxicol Environ Saf
January 2025
Center for Clinical and Epidemiologic Research, Beijing An Zhen Hospital, Capital Medical University, Beijing, China; Beijing Institute of Heart, Lung and Blood Vessel Diseases, Beijing, China; National Clinical Research Center of Cardiovascular Diseases, Beijing, China; The Key Laboratory of Remodeling-Related Cardiovascular Diseases, Ministry of Education, Beijing, China; The Beijing Municipal Key Laboratory of Clinical Epidemiology, Beijing, China. Electronic address:
Background: Ambient temperatures and PM can trigger myocardial infarction (MI), while little is known about the complex interplay between these two factors on MI, especially morbidity.
Objectives: To investigate bidirectional effect modifications of temperature and PM on MI morbidity and mortality.
Methods: A time-stratified case-crossover study was conducted utilizing high-resolution data of temperature and PM, along with 498,077 MI cases from the citywide registry in Beijing, China from 2007 to 2021.
Braz J Psychiatry
January 2025
Service of Interdisciplinary Neuromodulation, Laboratory of Neurosciences (LIM-27), Department and Institute of Psychiatry, University of São Paulo, São Paulo, SP, Brazil.
Objective: Post-stroke depression (PSD) affects approximately 40% of stroke survivors, with cognitive deficits being frequently observed. Transcranial Direct Current Stimulation (tDCS) has shown promise in improving cognitive performance in stroke patients. We explored the effects of tDCS on cognitive performance in PSD.
View Article and Find Full Text PDFSchizophr Bull
January 2025
Department of Psychiatry, University of California San Diego, La Jolla, CA 92093, United States.
Background And Hypothesis: For the rapidly growing population of older people living with schizophrenia (PLWS), psychological resilience, or the capacity to adapt to adversity, is an understudied target for improving health. Little is known about resilience and its longitudinal impact on outcomes among PLWS. This study assesses trajectories of resilience-related traits in PLWS and a nonpsychiatric comparison group (NCs) and longitudinal interactions between resilience and health.
View Article and Find Full Text PDFUnlabelled: The reflexive translation of symbols in one chemical language to another defined genetics. Yet, the co-linearity of codons and amino acids is so commonplace an idea that few even ask how it arose. Readout is done by two distinct sets of proteins, called aminoacyl-tRNA synthetases (AARS).
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