نتایج جستجو برای: pretension loads
تعداد نتایج: 41682 فیلتر نتایج به سال:
Since safe human-robot interaction is naturally linked to compliance in these robots, this requirement presents a challenge for the positioning accuracy. The class of variable-stiffness robots features intrinsically soft contact behavior where physical stiffness can even be altered during operation. Here we present control scheme bidirectional, antagonistic actuators that achieve high-precision...
Ring flange connections with preloaded high strength bolts are most commonly used to connect two segments of steel tubular towers. Behaviour and durability ring is influenced by various factors, including stiffness flanges, fabrication execution imperfections, welding technology details the flange/segment connection, type bolts, pretension technique control accomplished force in bolts. This pap...
Plate-type acoustic metamaterials (PAM) consist of a thin plate with periodically added masses. Similar to membrane-type metamaterials, PAM exhibit anti-resonances at low frequencies which the transmission loss can be much higher than mass-law without requiring pretension. Most designs previously investigated in literature require addition up thousands masses per square meter. This makes manufa...
OBJECTIVES To analyse the association between the presence of resistance mutations and treatment outcomes. The impact of HIV-1 drug resistance mutations in African adults on HAART has so far never been reported. METHODS In 2004 in Abidjan, Côte d'Ivoire, 106 adults on HAART had plasma viral load measurements. Patients with detectable viral loads had resistance genotypic tests. Patients were f...
Despite several studies regarding the correlation between serum HBsAg titers and viral loads, the association remains uncertain. Eighty-nine individuals were selected randomly from a Chinese cohort of 2,258 subjects infected persistently with hepatitis B virus (HBV) for cross-sectional and longitudinal analysis. Viral loads of mutant HBV are lower than those of wild type HBV. The serum HBsAg ti...
When multiple radio-frequency sources are connected to multiple loads through a passive multiport matching network, perfect power transfer to the loads across all frequencies is generally impossible. In this two-part paper, we provide analyses of bandwidth over which power transfer is possible. Our principal tools include broadband multiport matching upper bounds, presented herein, on the integ...
Herbivorous and detritivorous fishes interact closely with the epilithic algal matrix (EAM) on coral reefs. While sediment and organic detrital loads within the EAM might influence this interaction, the responses of functionally distinct fishes to changing sediment and organic loads have not been investigated. Aquarium based feeding trials were performed to assess how different sediment and org...
The application of artificial loads to mammals and birds has been used to provide insight into the mechanics and energetic cost of terrestrial locomotion. However, only two species of bird have previously been used in loading experiments, the cursorial guinea fowl (Numida meleagris) and the locomotor-generalist barnacle goose (Branta leucopsis). Here, using respirometry and treadmill locomotion...
I n the United States and most other countries, primary air quality standards are designed to protect human health and are based on concentrations of pollutants in the air. However, from the perspective of ecosystem health, a more appropriate metric for the impacts of nitrogen (N) and sulfur (S) pollutants is the total atmospheric deposition (or “load,” in kg·ha·y) of N and S, because ecosystem...
Infection of domestic cats with Feline immunodeficiency virus (FIV) results in a fatal immunodeficiency disease, similar to Human immunodeficiency virus 1 (HIV-1) in humans. Elevated plasma viral loads in domestic cats are correlated to decreased survival time and disease progression. However, FIV is also maintained as an apathogenic infection in other members of the family Felidae including co...
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