Effect of V/III ratio on the structural and optical properties of self-catalysed GaAs nanowires.

The performance of GaAs nanowire (NW) devices depends critically on the presence of crystallographic defects in the NWs such as twinning planes and stacking faults, and considerable effort has been devoted to understanding and preventing the occurrence of these. For self-catalysed GaAs NWs grown by molecular beam epitaxy (MBE) in particular, there are in addition other types of defects that may be just as important for NW-based optoelectronic devices. These are the point defects such as the As vacancy and the Ga antisite occurring due to the inherently Ga-rich conditions of the self-catalysed growth.

New Insights into the Origins of Sb-Induced Effects on Self-Catalyzed GaAsSb Nanowire Arrays.

Ternary semiconductor nanowire arrays enable scalable fabrication of nano-optoelectronic devices with tunable bandgap. However, the lack of insight into the effects of the incorporation of Vy element results in lack of control on the growth of ternary III-V(1-y)Vy nanowires and hinders the development of high-performance nanowire devices based on such ternaries. Here, we report on the origins of Sb-induced effects affecting the morphology and crystal structure of self-catalyzed GaAsSb nanowire arrays.

Position-controlled uniform GaAs nanowires on silicon using nanoimprint lithography.

We report on the epitaxial growth of large-area position-controlled self-catalyzed GaAs nanowires (NWs) directly on Si by molecular beam epitaxy (MBE). Nanohole patterns are defined in a SiO2 mask on 2 in. Si wafers using nanoimprint lithography (NIL) for the growth of positioned GaAs NWs.

The Moreton Lecture: Choices faced by radiology in the era of accountable health care.

If the United States is to address its overall economic challenges, the rate of growth of health care costs must be restrained. For the next decade, physicians should expect that the principal focus of health policy will be on cost reduction, with a particular emphasis on shifting the business model from one in which physicians and hospitals are rewarded for volume to a model in which they are accountable for value. To succeed in this new model, doctors will need to reduce overuse (driven primarily by overcapacity), eliminate the costs of preventable complications, and trim prices for many services.

Leading quality improvement in primary care: recommendations for success.

Leadership is increasingly recognized as a potential factor in the success of primary care quality improvement efforts, yet little is definitively known about which specific leadership behaviors are most important. Until more research is available, the authors suggest that primary care clinicians who are committed to developing their leadership skills should commit to a series of actions. These actions include embracing a theory of leadership, modeling the approach for others, focusing on the goal of improving patient outcomes, encouraging teamwork, utilizing available sources of power, and reflecting on one's approach in order to improve it.

An interview with James L. Reinertsen. Interview by Penny Carver.

Dr. Reinertsen reflects on improvements in the past decade in the quality and safety of health care and identifies the greatest challenges now facing health care leaders.

Informed consent to the ties that bind: clinical integration.

If you're already aboard or about to board the physician/hospital integration train, take a moment to ask some critical questions and consider the consequences.

Avoiding quality fraud.

What constitutes "quality fraud"? Learn about the board's responsibilities and liability, as well as how to protect your organization from CMS and the DOJ.

Finding common cause in quality: confronting the physician engagement challenge.

Although it's difficult to achieve, physicians can be engaged and supportive of quality improvement efforts, if the activity is presented and managed effectively.

Sharing the quality agenda with physicians.

Hospitals cannot hope to improve quality without physician engagement--and the board's role in working to build and sustain a shared agenda with its medical leadership and staff is paramount.

The 100,000 lives campaign: crystallizing standards of care for hospitals.

The 100,000 Lives Campaign has the attention of U.S. hospitals, professional groups, and the media.

Taking responsibility for closing the holes.

Healthcare leaders must assume responsibility for closing the "holes" in their organizations. At the organizational level, this means taking personal responsibility for error, making safety an explicit organizational goal and building an organization with the people, resources and courage to achieve the goal. At the process level, it requires removing unnecessary complexity from processes.

Zen and the art of physician autonomy maintenance.

The miracles of scientific medicine propelled physicians to an unparalleled level of clinical autonomy during the 20th century. During the past 20 years, physician autonomy has been declining, in part because the public has become aware that physicians are not consistently applying all of the science they know. One of medicine's most cherished professional values, individual clinical autonomy, is an important cause of the sometimes suboptimal performance in the timely and consistent application of clinical science; thus, it contributes to the decline in overall professional autonomy.