ADPIC: a tool for the NEST-On-Scene-Commander

The Atmospheric Release Advisory Capability code ADPIC is used to calculate dose and ground deposition from mitigated and unmitigated high explosive detonation of a radiation dispersal device. Comparisons are made assuming differing particle size and activity distributions associated with the mitigation effort

Production and post-acceleration of intense ion beams in magnetically insulated gaps

Experiments are described pertaining to the development of very high current pulsed linear ion accelerators utilizing electron neutralization. These have application as inertial fusion drivers with intermediate mass ion beams of greatest interest. Progress has been made in a number of areas. A novel magnetically insulated gap using radial magnetic fields has been tested. It provides stable electron cloud confinement over microsecond time scales with no detectable leakage current. The gap can act as an ion injector when used in conjunction with a plasma source. Control of the electron cloud dynamics allows the injector to operate in an enhanced current density mode (10 to 50 times the Child-Langmuir limit) with high efficiency and with plasma source control of the current flow. Currents up to 20 kA at 100 kV applied voltage resulted when using a light ion flashboard. Carbon beams were produced by extraction from a flowing plasma from a gun array

Factors affecting vegetation establishment and development in a sand dune chronosequence at Newborough Warren, North Wales

Newborough Warren is a large calcareous west coast UK dune system, which has experienced rapid vegetation spread in the last 70 years. Information from two high resolution chronosequences for dry and wet dune habitats, 0–145 years, was used to answer the following questions: Does climate influence colonisation of vegetation on bare sand? What are the timescales and sequences of successional change in the vegetation? Analysis of aerial photographs showed that stabilisation of the dune system since 1945 has occurred in three main phases. The onset of stabilisation predated myxomatosis by 10 years; while stabilisation virtually halted during the period 1964–1978. Periods of rapid stabilisation were coincident with higher values of Talbot’s Mobility index (M) > 0.3. Successional development was apparent in both dry and wet habitats. Fixed dune grassland started to replace earlier successional communities at around 40 years, and could persist to 145 years. Linear succession in dune slacks was less apparent, but a separation between communities typically regarded as ‘younger’ and ‘older’ occurred at around 40 years. Species richness in dry dune habitats increased with age to a maximum on soils around 60 years old, then declined again. Species richness was unrelated to age or soil development in wet dune slacks. The influence of climate suggests that conservation managers can only operate within the constraints imposed by natural climatic conditions. Vegetation growth and soil development are closely linked and maintaining some open areas is key to preventing soil development and over-stabilisation

Primary Care Patients with Depression Are Less Accepting of Treatment Than Those Seen by Mental Health Specialists

OBJECTIVE: This study examined whether depressed patients treated exclusively in primary care report less need for care and less acceptability of treatment options than those depressed patients treated in the specialty mental health setting after up to 6 months of treatment. DESIGN: Cross-sectional study. SETTING: Forty-five community primary care practices. PARTICIPANTS: A total of 881 persons with major depression who had received mental health services in the previous 6 months and who enrolled in 3 of the 4 Quality Improvement for Depression Collaboration Studies. MEASUREMENTS AND RESULTS: Patients were categorized into 1 of 2 groups: 1) having received mental health services exclusively from a primary care provider (45%), or 2) having received any services from a mental health specialist (55%) in the previous 6 months. Compared with patients who received care from mental health specialists, patients who received mental health services exclusively from primary care providers had 2.7-fold the odds (95% confidence interval [CI], 1.6 to 4.4) of reporting that no treatment was definitely acceptable and had 2.4-fold the odds (95% CI, 1.5 to 3.9) of reporting that evidence-based treatment options (antidepressant medication) were definitely not acceptable. These results were adjusted for demographic, social/behavioral, depression severity, and economic factors using multiple logistic regression analysis. CONCLUSIONS: Patients with depression treated exclusively by primary care providers have attitudes and beliefs more averse to care than those seen by mental health specialists. These differences in attitudes and beliefs may contribute to lower quality depression care observed in comparisons of primary care and specialty mental health providers