Search results

Thick printing Cu and Ag conductors have been developed specifically for use in power applications where excellent printing, thermal, electrical, wire bonding and soldering properties are prerequisite. Efficient thermal management can require fired films on alumina in excess of 150μm and often printed in large areas. In some designs the thickness of mounting pads alone for bare silicon dies may need to be built up locally. This approach enables a single substrate to comprise both thinner printed, dense circuitry for signal control and thick device mounting pads for efficient thermal management. The flexibility of thickness control, through hole connections and the ability to incorporate printed resistors using standard thick film processing can offer solutions which complement the other substrate technologies in many applications. This paper describes the advancements made in optimizing the performance of thick printing copper and silver conductors designed for use in power applications and their role in this demanding technology. The features of the materials, process guidelines, and performance characteristics will be discussed.

On 20 April ISHM‐Benelux held its 1988 Spring meeting at the Grand Hotel Heerlen. This meeting was totally devoted to implantable devices, in particular to the technologies used for these high reliability, extremely demanding devices. For this meeting ISHM‐Benelux was the guest of the Kerkrade facility of Medtronic. Medtronic (headquartered in Minneapolis, USA) is the world's leading manufacturer of implantable electronic devices. Apart from the assembly of pacemakers and heart‐wires, the Kerkrade facility acts as a manufacturing technology centre for Medtronic's European facilities.

Concerns regarding the management of water and air pollution in border regions – such as the California‐Mexico Border, is an old issue, which has bubbled up to its current crisis situation. Health and safety disasters, stemming from water pollution on both sides of the border mount as do related costs to local financially‐strapped communities in California. One such impacted community is Imperial County, California, which must deal with the consequences stemming from the “dirtiest river in the United States”. This refers to The New River which enters the US through Mexico. While NAFTA has promoted the growth of globalized companies and industries in the region, progress has added to pollution. Regulation is far from evenly matched in the two countries. To manage negative spillover effects from globalism across borders, the time has come for development of new administrative law, with strict penalties for violators. This article uses the impact of pollution from The New River to discuss the hollowing of our nation‐state’s democratically‐derived mandate against pollution. It also raises the question of whether we have the stomach to push for new administrative law and risk multinational flight to other more accommodating regions, or live with the status quo and its serious human and environmental consequences.

Incineration strengths of hazardous (2.8×10⁸μg/s) and nonhazardous (6.31×10⁸μg/s) materials were found from the quantities to be incinerated, chemical formulas, and the incineration time. The smoke stack geometry, exhaust dynamics, and different atmospheric stability conditions were used in the Gaussian model to predict the maximum concentration distances of 0.5 to about 6 km at the ground level in the downwind direction. However, trailing edges of some of exhaust distributions were found to extend beyond 120 km under some atmospheric stability conditions. The counties of Jefferson, Lonoke, Pulaski, Dallas, Cleveland, Calhoun, and Grant in the state of Arkansas are more likely to be affected than others. The possible major products in the hazardous incineration exhaust are chlorinated compounds. The results of this study are important to know the areas that fall under comparatively higher concentrations of incineration exhaust for further observations because of its inherent impact upon living beings, crop production, and environmental conditions.