Examination of ozonesonde data for trends and trend changes incorporating solar and Arctic oscillation signals

One major question that arises with the implementation of the Montreal Protocol and its subsequent conventions is our ability to determine that an ozone “recovery” is in process. Toward this we have utilized a statistical model suggested by Reinsel et al. (2002) that utilizes the idea of a trend and a trend change at a specific time and applied it to 12 ozonesonde stations in the midlatitudes of the Northern Hemisphere. The lower stratosphere, in particular, is of significance as this is where the ozone concentration is a maximum and also where heterogeneous ozone losses have been noted. This statistical methodology suffers, however, from the ambiguities of having to select a specific time for the ozone trend to change and the fact that the Mt Pinatubo volcanic aerosols impacted the ozone amount. Within this paper, we analyze the ozonesonde station data utilizing the above model but examine the statistical stability of the computed results by allowing the point of inflection to change from 1995 through 2000 and also exclude varying amounts of data from the post-Pinatubo period. The results indicate that while the impacts of deleting data and changing the inflection point are nontrivial, the overall results are consistent in that there has been a major change in the ozone trend in the time frame of 1996 and that a reasonable scenario is to utilize a change point in 1996 and exclude 2 years of data after the 1991 Mt. Pinatubo eruption. In addition, we include a term for the Arctic oscillation within the statistical model and demonstrate that it is statistically significant

Variable selection criterion and algorithm in regression.

Variable selection criterion and algorithm in regression

Treatment and reuse of the wastewater of bean products with the phytosynthetic bacteria and Spirulina maxima

A try on the treatment and reuse of the waste water of bean products with the phytosynthetic bacteria(PSB) and S.maxima(SM)was introduced.First the waste water of bean products was treated with PSB to decompositing organic matter,and then chitin was added for precipitating PSB,the last SM was added into the treated waste water for removing organic matter further and reusing nitrogen and phosphorous.The results of an dynamic modled experiment showed that PSB have a high removal efficiency for COD(70%) on the waste water of bean products,and SM cultured in the treated waste waster grow well,the rate of growing is 2030mg dryweight/(Ld),and the content of protein and free amino acid in SM are 52.6g/100g dryweight and 2.41g/100g dryweight respectively

Nouveau domaine Internet .int

Le CTA a adopté le domaine de premier niveau réservé aux organisations internationales : ‘.int’. L’adresse e-mail du CTA est désormais [email protected] La page Web de Spore se trouve maintenant à : http://spore.cta.int (inutile de taper www.) L’ancienne adresse cta.nl est toujours active, mais merci de noter le changement dans votre carnet d’adresses, vos listes de distributions, liens, index et autres favoris..Le CTA a adopté le domaine de premier niveau réservé aux organisations internationales : ‘.int’. L’adresse e-mail du CTA est désormais [email protected] page Web de Spore se trouve maintenant à : http://spore.cta.int (inutile de taper www.)..

Mutations in SEC63 cause autosomal dominant polycystic liver disease.

Mutations in PRKCSH, encoding the beta-subunit of glucosidase II, an N-linked glycan-processing enzyme in the endoplasmic reticulum (ER), cause autosomal dominant polycystic liver disease. We found that mutations in SEC63, encoding a component of the protein translocation machinery in the ER, also cause this disease. These findings are suggestive of a role for cotranslational protein-processing pathways in maintaining epithelial luminal structure and implicate noncilial ER proteins in human polycystic disease