Abstract: An acoustical panel has a multiplicity of short micro-slits, about 10 mm in length each, with each micro-slit having a wedge shaped cross-section in which the opening on the front side of the panel is wider than the opening on the rear side of the panel by a factor of about 2 to effectively absorb sound frequencies in the range of 250-2000 Hz, with the micro-slits greater than 4%. The micro-slits are spaced apart less than 5 mm and several different patterns of micro-slits may be employed including micro-slits that are straight as well as arcuate or some combination of straight and arcuate. The area of the micro-slits on the front surface of the panel exceeds 4%.

Abstract: An acoustical panel has a multiplicity of short micro-slits, about 10 mm in length each, with each micro-slit having a wedge shaped cross-section in which the opening on the front side of the panel is wider than the opening on the rear side of the panel by a factor of about 2 to effectively absorb sound frequencies in the range of 250-2000 Hz, with the micro-slits greater than 4%. The micro-slits are spaced apart less than 5 mm and several different patterns of micro-slits may be employed including micro-slits that are straight as well as arcuate or some combination of straight and arcuate. The area of the micro-slits on the front surface of the panel exceeds 4%.

Abstract: A credibility engine creates individual credibility scores and network credibility scores that are distinguished from purely economic credit scores and which can be used to objectively rate a comparative value of credibility for entities and entity networks. The credibility engine analyzes credibility related information obtained from information providers and calculates corresponding credibility scores that are provided to information requesters. Some of the credibility related information used to create the credibility scores is obtained from surveys or reviews provided to primary and secondary sources having corresponding primary and secondary relationships with the entity. The entity can be an individual or organization.