Inference with interference between units in an fMRI experiment of motor inhibition

An experimental unit is an opportunity to randomly apply or withhold a treatment. There is interference between units if the application of the treatment to one unit may also affect other units. In cognitive neuroscience, a common form of experiment presents a sequence of stimuli or requests for cognitive activity at random to each experimental subject and measures biological aspects of brain activity that follow these requests. Each subject is then many experimental units, and interference between units within an experimental subject is likely, in part because the stimuli follow one another quickly and in part because human subjects learn or become experienced or primed or bored as the experiment proceeds. We use a recent fMRI experiment concerned with the inhibition of motor activity to illustrate and further develop recently proposed methodology for inference in the presence of interference. A simulation evaluates the power of competing procedures.Comment: Published by Journal of the American Statistical Association at http://www.tandfonline.com/doi/full/10.1080/01621459.2012.655954 . R package cin (Causal Inference for Neuroscience) implementing the proposed method is freely available on CRAN at https://CRAN.R-project.org/package=ci

Design of a 12 channel fm microwave receiver

The design, fabrication, and performance of elements of a low cost FM microwave satellite ground station receiver is described. It is capable of accepting 12 contiguous color television equivalent bandwidth channels in the 11.72 to 12.2 GHz band. Each channel is 40 MHz wide and incorporates a 4 MHz guard band. The modulation format is wideband FM and the channels are frequency division multiplexed. Twelve independent CATV compatible baseband outputs are provided. The overall system specifications are first discussed, then consideration is given to the receiver subsystems and the signal branching network

Program on application of communications satellites to educational development: Design of a 12 channel FM microwave receiver

The design, fabrication, and performance of elements of a low cost FM microwave satellite ground station receiver is described. It is capable of accepting 12 contiguous color television equivalent bandwidth channels in the 11.72 to 12.2 GHz band. Each channel is 40 MHz wide and incorporates a 4 MHz guard band. The modulation format is wideband FM and the channels are frequency division multiplexed. Twelve independent CATV compatible baseband outputs are provided. The overall system specifications are first discussed, then consideration is given to the receiver subsystems and the signal branching network

Magnetism, structure, and charge correlation at a pressure-induced Mott-Hubbard insulator-metal transition

We use synchrotron x-ray diffraction and electrical transport under pressure to probe both the magnetism and the structure of single crystal NiS2 across its Mott-Hubbard transition. In the insulator, the low-temperature antiferromagnetic order results from superexchange among correlated electrons and couples to a (1/2, 1/2, 1/2) superlattice distortion. Applying pressure suppresses the insulating state, but enhances the magnetism as the superexchange increases with decreasing lattice constant. By comparing our results under pressure to previous studies of doped crystals we show that this dependence of the magnetism on the lattice constant is consistent for both band broadening and band filling. In the high pressure metallic phase the lattice symmetry is reduced from cubic to monoclinic, pointing to the primary influence of charge correlations at the transition. There exists a wide regime of phase separation that may be a general characteristic of correlated quantum matter.Comment: 5 pages, 3 figure

International Foot and Ankle Biomechanics Community (i-FAB): past, present and beyond

The International Foot and Ankle Biomechanics Community (i-FAB) is an international collaborative activity which will have an important impact on the foot and ankle biomechanics community. It was launched on July 2nd 2007 at the foot and ankle session of the International Society of Biomechanics (ISB) meeting in Taipei, Taiwan. i-FAB is driven by the desire to improve our understanding of foot and ankle biomechanics as it applies to health, disease, and the design,development and evaluation of foot and ankle surgery, and interventions such as footwear, insoles and surfaces

The role of Medicaid in promoting access to high-quality, high-value maternity care

The main purpose of this article is to analyze and describe the role of Medicaid in facilitating access to care for pregnant women and ensuring high-quality maternity care that is affordable. It first summarizes the federal Medicaid requirements regarding eligibility, coverage of benefits, financing, and service delivery, with a special emphasis on existing quality provisions. Then, it discusses current issues and recommends several Medicaid reforms, particularly in the area of quality assessment and improvement. All reforms, including Medicaid reforms, should seek to support the IOM-identified aims. Much of the emphais in Medicaid policy development has been focused on access to care and great need for reform remains in the area of quality assurance and improvement, and disparity reduction because the program can play a significant role in this regard as well. More broadly, health care reform may provide an opportunity to revisit key issues around access to and quality of maternity care, including the benefit package, the content of services covered in the package, the frequency with which these services should be furnished, and the development of meaningful measures to capture whether women of childbearing age, including pregnant women, regardless of insurance status, indeed receive efficient, timely, effective, safe, accessible, and woman-centered maternity care

Conductivity of Metallic Si:B near the Metal-Insulator Transition: Comparison between Unstressed and Uniaxially Stressed Samples

The low-temperature dc conductivities of barely metallic samples of p-type Si:B are compared for a series of samples with different dopant concentrations, n, in the absence of stress (cubic symmetry), and for a single sample driven from the metallic into the insulating phase by uniaxial compression, S. For all values of temperature and stress, the conductivity of the stressed sample collapses onto a single universal scaling curve. The scaling fit indicates that the conductivity of si:B is proportional to the square-root of T in the critical range. Our data yield a critical conductivity exponent of 1.6, considerably larger than the value reported in earlier experiments where the transition was crossed by varying the dopant concentration. The larger exponent is based on data in a narrow range of stress near the critical value within which scaling holds. We show explicitly that the temperature dependences of the conductivity of stressed and unstressed Si:B are different, suggesting that a direct comparison of the critical behavior and critical exponents for stress- tuned and concentration-tuned transitions may not be warranted

Changing Policy: The Elements for Improving Childhood Asthma Outcomes

This report lays out the facts and offers specific policy recommendations for success that could change the face of childhood asthma in America. These recommendations aim to make better use of programs and policies already in place, such as Medicaid and the Children\u27s Health Insurance Program (CHIP), as well as private sector insurance coverage and existing public health programs. The recommendations also underscore the importance of careful research -- scientific, practical, and community-based -- in order to continue to learn what works best and strengthen knowledge for future action. In a reformed health system, these initial efforts are not wasted tools. Instead, they become the critical platform on which further interventions would rest

Public health insurance design for children: The evolution from Medicaid to SCHIP

In 2005 Medicaid will turn 40, a momentous event in the life of the largest and most complex of all means-tested public entitlement programs. Since 1997, Medicaid has co-existed with the State Children’s Health Insurance Program (SCHIP), a small program which covers a fraction of the number of Medicaid enrolled children but whose legislative structure looms large against its much beleaguered companion. To the unpracticed eye, SCHIP and Medicaid appear to be quite similar in design; in reality however, their differences could not be more profound, and it is in these differences that clear directions for Medicaid’s possible future become visible. It is these differences and their meaning for U.S. child health policy which are the subject of this article. The majority of States that have implemented SCHIP as a separately-administered program have opted for benefit and coverage design in the case of early childhood preventive and developmental services that are considerably less comprehensive than the standard of coverage furnished to infants and young children under Medicaid. Researchers found that all States with separate SCHIP programs cover basic well-baby and well-child care in their service agreements; however, wide variation was found among the study States in their use of coverage standards that explicitly require participating health plans to cover child development services required under Medicaid, such as anticipatory guidance (18%), lead screening (43%), and comprehensive developmental assessments (68%). In addition, only half of the study States require participating health plans to use a medical necessity standard comparable to the Medicaid standard. The authors conclude that when States are given the flexibility to do so, they tend to reduce the level of coverage to that found in standard health insurance products, rather than the level of coverage in the Medicaid Early and Periodic Screening Diagnosis and Treatment program