The VentrAssist implantable rotary blood pump, intended for long term ventricular assist, is under development and is currently being tested for its rotor-dynamic stability. A shaftless impeller, which also acts as the rotor of the brushless DC motor, is passively suspended in the pump cavity by hydrodynamic forces. The paper presents experimental investigation of the displacement of the impell...

The comparison of simultaneous humidity measurements by the Vaisala RS92 radiosonde and by the Cryogenic Frostpoint Hygrometer (CFH) launched at Alajuela, Costa Rica, during July 2005 reveals a large solar radiation dry bias of the Vaisala RS92 humidity sensor and a minor temperature-dependent calibration error. For soundings launched at solar zenith angles between 10° and 30°, the average dry ...

many soil nematodes, Caenorhabditis elegans feeds on bacteria suspended in liquid. Bacteria are transported from the mouth to the intestine by a neuromuscular tube called the pharynx. The pharynx functions as a pump, generating pressure to force food into the intestine, necessary because the interior of the nematode is at higher pressure than the surrounding environment (Harris and Crofton, 195...

Getaran kereta api merupakan salah satu sumber mikrotremor. ini perlu dianalisis untuk mengetahui dampak terhadap lingkungan di sekitar jalur api. Pengukuran mikrotremor telah dilakukan menggunakan metode horizontal to vertical spectral ratio (HVSR) Kota Padang. Tujuan penelitian adalah karakteristik geologi setempat dan tingkat getaran mekanik akibat pada daerah padat rumah penduduk 5 titik de...

In this article, we present the Open-Source AcoustoFluidics Theories (OSAFT) library (version 0.9.14), a Python for acoustofluidics. The focus of is classical problem particle suspended in fluid and subjected to an incident acoustic wave. code provides easy access number theories describing scattering, streaming, most importantly radiation force exerted on particle. At time submission six diffe...

A comparative study is given for the sensitivity of several typical Si nanophotonic waveguides, including SOI (silicon-on-insulator) nanowires, nanoslot waveguides, suspended Si nanowires, and nanofibers. The cases for gas sensing (ncl ~ 1.0) and liquid sensing (ncl ~ 1.33) are considered. When using SOI nanowires (with a SiO₂ buffer layer), the sensitivity for liquid sensing (S ~ 0.55) is high...

The major goal of this study is to demonstrate the feasibility of the dynamic modeling and simulation of both conventional and direct exchange geothermal heat pump applications particularly with regard to performance evaluations. Therefore, in this research, dynamic models for the simulation of geothermal heat pump systems with the working fluid propane for the application in building-scale ene...

Due to the rising energy (and electricity) cost it is essential that an active magnetic bearing (AMB) system is operated as efficiently as possible. Frequency switching caused by an external source can cause an AMB system to operate at a higher than expected energy level and lower than expected efficiency. The purpose of this paper is therefore to investigate the impact of frequency switching (...