with the prolonged use of domestic centrifugal pump, due to erosion, corrosion and an unbalance the sever vibration of the pump are resulted. an erratic sound coming out of pump makes the user uncomfortable. here, tuned vibration absorber (tva) is used as a vibration controlling device. it is designed to reduce the rms velocity below 20% of the circumferential speed, at which the impeller is ba...

Indicators are used to quantify the pressure of pesticides on the environment. Pesticide risk indicators typically require weighting environmental exposure by a no effect concentration. An indicator based on spread equivalents (ΣSeq) is used in environmental policy in Flanders (Belgium). The pesticide risk for aquatic life is estimated by weighting active ingredient usage by the ratio of their ...

abstract for seismic design, it is important to estimate the, maximum lateral displacement (inelastic displacement) of the structures due to earthquakes for several reasons. seismic design provisions estimate the maximum roof and storey drifts occurring in major earthquakes by amplifying the roof displacement and drifts of the structures obtained by elastic analysis subjected to seismic design ...

A short-time exposure on the concentration--time relationship base, a classification of substances according to the degree of hazard and the program for assessing safety coefficients have been suggested in order to predict the basic toxicometric parameters (chronic exposure thresholds, maximum allowable concentrations, safety coefficients, and others).

conditional monitoring is prerequisite to prevent severe damage or falling down the trees. problems such as trunk decays, reduces trees resistance against wind and floods. in this study, a mathematical modeling technique is being selected to determine the trees strength against such events. finally, an applicable model for safety factor was created by having numeral (dimensions of crown and tru...

.........................................................................................................................................................................1 Roadside Drainage Design for Channel Stability ..........................................................................................................2 Allowable Velocity and Shear Stress.......................................

background: genes for human epidermal growth factor receptors b1 (erbb1) and b2 (erbb2) were amplified in breast and ovarian cancers. both of them were associated with aggressive disease and worse prognosis. the erbb1 or erbb2 status of a tumor may provide an indication of the response to erbb1 and erbb2 -targeted therapies. for accurate and rapid assessment of amplification of erbb1 and erbb2 ...

When a vehicle passes over bridge, it may jump on the bridge due to damaged expansion joint. The sudden induces heavy dynamic impact and therefore damages deck girder. traditional amplification factor defined by current design code shows of static effects bridge. However, only concerns stable moving load induced vehicle. joint sometimes exceeds allowable load, so is important evaluate in practi...