Jasbir Bath

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The second law of thermodynamics requires that directed motion be accompanied by dissipation of energy. Here we demonstrate the working principles of a bipedal molecular motor. The motor is constructed from DNA and is driven by the hybridization of a DNA fuel. We show how the catalytic activities of the feet can be coordinated to create a Brownian ratchet(More)
This paper presents the drop test reliability of 0.5mm pitch lead-free chip scale packages (CSPs). Fifteen 0.5mm pitch CSPs were assembled on a standard JEDEC drop reliability test board with Sn3.0Ag0.5Cu lead-free solder. Eight boards were edge-bonded with a UV-cured acrylic; eight boards were edge-bonded with a thermal-cured epoxy; and twelve boards were(More)
The National Electronics Manufacturing Initiative (NEMI) Lead-Free Assembly Project had the following priorities: • to down-select an alloy from the SnAgCu families to be recommended as the main standard lead-free solder; • to demonstrate production-ready parts, materials and processes for lead-free soldering printed wiring board (PWB) assemblies, with an(More)
This paper presents the drop test reliability results for edge-bonded 0.5 mm pitch lead-free chip scale packages (CSPs) on a standard JEDEC drop reliability test board. The test boards were subjected to drop tests at several impact pulses, including a peak acceleration of 900 Gs with a pulse duration of 0.7 ms, a peak acceleration of 1500 Gs with a pulse(More)
Purpose – The purpose of this paper is to investigate the effects of reflow time, reflow peak temperature, thermal shock and thermal aging on the intermetallic compound (IMC) thickness for Sn3.0Ag0.5Cu (SAC305) soldered joints. Design/methodology/approach – A four-factor factorial design with three replications is selected in the experiment. The input(More)
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