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Radiation detectors installed at major ports of entry are a key component of the overall strategy to protect countries from nuclear terrorism. While the goal of deploying these systems is to intercept special nuclear material as it enters the country, no detector system is fool proof. Mobile, distributed sensors have been proposed to detect nuclear materials in transit should portal monitors fail to prevent their entry in the first place. In large metropolitan areas a mobile distributed sensor network could be deployed using vehicle platforms such as taxis, Ubers and Lyfts which are already connected to communications infrastructure. However, the potential geographic coverage that could be achieved using a network of sensors mounted on commercial passenger vehicles has not been established. Here we evaluate how a mobile sensor network could perform in New York City using a combination of radiation transport and Geographic Information Systems. The Geographic Information System QGIS is used in conjunction with OpenStreetMap data to isolate roads and construct a grid over the streets. Vehicle paths are built using pickup and drop off data from Uber, and data from the New York State Department of Transportation.

Proceeding directly to empiric or supportive therapy is often more practical than attempting to identify the cause of loose stools in some patients. But when is it crucial to pursue a diagnosis? [ABSTRACT FROM AUTHOR]

Between January 1984 and December 1987, 1509 singleton neonates were admitted into Special Care Baby Unit at the University of Port Harcourt Teaching Hospital; 29(1.9%) of these were Extreme Low Birthweight (ELBW), 86(5.7%) were Very Low Birthweight (VLBW), 406(26.9%) were Low Birthweight (LBW) and 988 (65.5%) were Normal Birthweight (NBW) infants. Survival rates in the four categories were 10.3%, 46.5%, 89.2% and 94.7% respectively. Factors which significantly influenced survival in the VLBW infants included higher mean birthweight (p less than 0.01) longer mean gestation (p less than 0.001) and lower incidence of birth asphyxia (p less than 0.02 with Yates's correction). Furthermore the survivors were significantly more mature for their gestation than those who died (p = 0.008, Fisher's Exact test). Care of the VLBW infant is not beyond the capabilities of Special Care Baby units in developing countries. In the light of our report, survival of Low Birthweight infants is a strong reflection of that of VLBW infants and survival of this category of babies could be improved by instituting general measures such as those aimed at reducing the incidence of LBW in the environment and by specific measures like carrying out prompt and effective resuscitation of the asphyxiated neonate and preventing sepsis.PIP: A total of 1509 singleton neonates (849 males and 660 females) were admitted into the Special Care Baby Unit at the University of Port Harcourt Teaching Hospital in Nigeria between January 1984 and December 1987. Of these, 29 (1.9%) were extreme low birth weight (ELBW); 86 (5.7%) were very low birth weight (VLBW), 40 of whom survived; 406 (26.9%) were low birth weight (LBW); and 988 (65.5%) were normal birth weight (NBW) babies. Survival rates in the 4 groups were 10.3%, 46.5%, 89.2%, and 94.7%, respectively. Higher mean birth weight (p .01), longer mean gestation (p .001), and lower incidence of birth asphyxia (p .02 with Yates's correction) significantly more mature for their gestational age (p = .008, Fisher's exact probability test) than those who died. Among infants who survived, one each had idiopathic respiratory distress syndrome (RDS) and septicemia. Among the infants who died there were 2 cases of RDS and 1 each of aspiration pneumonia and septicemia. Survival of babies with birth weights under 1000 gm improved very little over the 4-year period, while the survival rates stayed constant at 90% in babies with birth weights of 1500 gm and above. The overall survival rate in the Unit improved from 86.1% in 1984 to 91.4% in 1987. There were relatively fewer cases of birth asphyxia in the VLBW category than in the rest of the babies resulting in better survival. The survival of LBW infants was distinctly reflected by that of VLBW infants whose survival could be improved by instituting measures such as prompt resuscitation of the asphyxiated neonate and prevention of sepsis. [ABSTRACT FROM AUTHOR]