Atom chips on direct bonded copper substrates

We present the use of direct bonded copper (DBC) for the straightforward fabrication of high power atom chips. Atom chips using DBC have several benefits: excellent copper/substrate adhesion, high purity, thick (> 100 microns) copper layers, high substrate thermal conductivity, high aspect ratio wires, the potential for rapid (< 8 hr) fabrication, and three dimensional atom chip structures. Two mask options for DBC atom chip fabrication are presented, as well as two methods for etching wire patterns into the copper layer. The wire aspect ratio that optimizes the magnetic field gradient as a function of power dissipation is determined to be 0.84:1 (height:width). The optimal wire thickness as a function of magnetic trapping height is also determined. A test chip, able to support 100 A of current for 2 s without failing, is used to determine the thermal impedance of the DBC. An assembly using two DBC atom chips to provide magnetic confinement is also shown.Comment: 8 pages, 5 figure

Understanding Factors that Influence Health Care Utilization Among Mixtec and Zapotec Women in a Farmworker Community in California.

This paper examines health care utilization among indigenous immigrants from Oaxaca, Mexico, who have settled in a farmworker community in southern California. In 2016, two trained Spanish-Mixteco and Spanish-Zapoteco bi-lingual interviewers conducted in-depth interviews with 44 indigenous women residing in Oxnard, California on issues that affect health care utilization. Interviews were conducted in Mixteco, Zapoteco and Spanish and were coded to identify structural, cultural, and provider-related barriers to health care utilization. Five bi-lingual Spanish-Mixteco indigenous interpreters employed at local clinics were also interviewed. Many women reported lack of health insurance, inability to pay, language barriers, long waiting times, rushed encounters with providers, and seeking western medical care only after home remedies did not work. However, several women were able to access routine health care services, often with support from indigenous interpreters employed at clinics. Interviews with five interpreters found that they provided assistance with interpretation during medical encounters and appointment making. They also educated patients about upcoming exams, identified low-cost services and insurance programs available to patients, assisted with paperwork and occasionally educated physicians on behalf of their patients. In addition to addressing barriers to health care access our findings suggest the importance of identifying and leveraging community assets, such as indigenous navigators, when developing programs for such underserved communities. Our findings can inform best practice in settings that provide health care to indigenous populations and may also apply to settings that provide health care to other immigrant communities that have very limited familiarity and contact with western health care