For reducing the initial GSHP investment, heat transfer efficiency of borehole exchange (BHE) system can be enhanced to reduce number or depth drilling. This paper proposes a novel and simple BHE design by changing cross-sectional shape U-tube increase BHEs. Specifically, in this study, we (1) verified reliability three-dimensional numerical model based on thermal response test (TRT) (2) compar...

We investigate the electronic and magnetic properties of hydrogenated carbon nanotubes using ab initio spin-polarized calculations within both the local density approximation (LDA) and the generalized gradient approximation (GGA). We find that the combination of charge transfer and carbon network distortion makes the spin-polarized flat-band appear in the tube's energy gap. Various spin-depende...

Tubular cathodes provide a method to obtain high surface areas for scaling up microbial fuel cells (MFCs), but the importance of the cathode shape is not known. We therefore examined power production using cathodes in various configurations (tubes or flat). The MFC with a single internal carbon cloth tube cathode (71 W/m(3)) produced more power than previously obtained with an ultrafiltration m...

A preliminary study of the feasibility of using piezo-transducer arrays, for detecting flaws in flat aluminum plates and steel tubing, is being performed at The University of Tennessee. The sensor arrays are designed for embedding in aluminum plates and brass tubes. Various forms of defects are placed on the test specimens. Preliminary experiments are carried out using both flat aluminum plate ...

Abstract The redistribution of matter in the deep-sea depends on water-flow currents and turbulent exchange, for which breaking internal waves are an important source. As turbulence essentially three-dimensional ‘3D’, their dynamical development should ideally be studied a volume seawater. However, this is seldom done ocean where 1D-observations along single vertical line already difficult. We ...

Objective: To assess the effect of alkaline versus acid surface treatment on bond strength of adhesives used for amalgam repair. Materials and Method: Sixty cylindrical samples were prepared by condensing amalgam into plastic tubes of 4mm diameter and 10mm length. Tubes were filled up to 5.0mm with admixed amalgam. They were allowed to set hard for three months. The samples were divided into A1...

The article presents the results of strength calculation FLAT RACK removable module design using finite element method. provides higher efficiency freight transportation. special features are its components made rectangular tubes and fittings with viscoelastic bonds. parameters profile for such a determined through maximum resistance moments components. research includes mathematical modelling ...

Effects of insertion of coiled wire in juxtaposition with twisted tapes on heat transfer rate and solar radiation without disturbing the flow inside the riser tubes in a solar flat plate collector is experimentally reconnoitered in this present work. The wire coil used as a turbulator is placed inside the riser tube while the twisted tape is inserted into the wire coil to create a continuous sw...