475 research outputs found
Micronutrient Deficiencies and Sleeve Gastrectomy for Weight Reduction
No full textBariatric surgery is considered one of the most effective and durable tools in the treatment and control of morbid obesity. Sleeve gastrectomy (SG) is actually one of the most performed bariatric procedures. Micronutrient deficiency is common in obese patients admitted for SG, with a reported prevalence in low levels of 25-vitamin D, folate, vitamin B1, vitamin B12, vitamin A, vitamin E, zinc, iron, and selenium. In addition, although SG does not cause malabsorption, it appears to alter micronutrient status, in particular of iron and vitamin B12 levels. Compounding the problem, SG may exacerbate pre-existing micronutrient deficiencies and may render obese patients prone to other severe conditions, most commonly anemic, metabolic, and especially neurological disorders. In conclusion, preoperative micronutrient assessment and a rigorous postoperative follow-up plan with administration of multi-vitamin and mineral supplements, and assessment of serum levels, is recommended after all bariatric procedures, even for restrictive procedures such as SG
Are artificial satellites orbits influenced by an expanding Earth?
No full textAlbeit in the past great theoretical and experimental efforts were made in proposing and searching for G time-decreasing, a major role could be played by an increase of M. A recent analysis (Scalera, 2003a) converges toward an upper limit of the Earths mass variation in the order of magnitude of M/M=10-9 /yr. It is here discussed the possible role that can be played by parameters linked to the expanding Earth in the effects we observe in the orbital motion of the artificial satellites. The important result in this short note is the discrimination between the reality of the glacial rebound process and/or the relaxation of the 100m excess of equatorial bulge testified by the high rate of j2 , and the improbable role that glacial rebound can have in driving PM and TPW. It is recommended that the new technology of drag-free satellites be used (Gravity-Probe B is the first step) to reveal possible residual orbital parameter variations ascribable to formerly unrecognized fictitious drag terms due to Earth radial increase
From the Unimate to the Delta Robot: The Early Decades of Industrial Robotics
No full textIn this paper, the early decades of the history of industrial robots (from the 1950’s to the beginning of the 1990’s, approximately) will be described. The history of industrial robotics can be considered starting with Unimate, the first industrial robot designed and built by Devol and Engelberger. The subsequent evolutions of industrial robotics are described in the manuscript, taking into account both the technical and the economic point of view, until the beginning of the 1990’s, when new kinematic structures (parallel robots) appeared, allowing high-speed operations
Are artificial satellites orbits influenced by an expanding Earth?
No full textAlbeit in the past great theoretical and experimental efforts were made in proposing and searching for G time-decreasing, a major role could be played by an increase of M. A recent analysis (Scalera, 2003a) converges toward an upper limit of the Earth’s mass variation in the order of magnitude of M/M=10-9 /yr. It is here discussed the possible role that can be played by parameters linked to the expanding Earth in the effects we observe in the orbital motion of the artificial satellites. The important result in this short note is the discrimination between the reality of the glacial rebound process and/or the relaxation of the 100m excess of equatorial bulge testified by the high rate of j2 , and the improbable role that glacial rebound can have in driving PM and TPW. It is recommended that the new technology of drag-free satellites be used (Gravity-Probe B is the first step) to reveal possible residual orbital parameter variations ascribable to formerly unrecognized fictitious drag terms due to Earth radial increase.JCR Journalope
La Gravitazione Idrodinamica Come Causa Della Espansione Terrestre
No full textDalle Scienze della Terra e dalle evidenze di espansione del pianeta (Egyed, 1961;
Hilgenberg, 1967, 1974; Carey, 1976; Owen, 1976; Maxlow, 2002; Cwojdziński, 2003;
Scalera, 1990, 1993, 2001, 2010, 2012, 2020), corroborate oggi dagli esperimenti di
rivelazione dei neutrini terrestri di origine radiogenica (Borexino collaboration, 2017;
Shimizu, 2017; Scalera, 2020) proviene la consapevolezza che la causa della espansione sia
un flusso di materia costitutiva, o etere, che converge verso il centro del pianeta
trasformandosi in materia ordinaria durante il tragitto superficie-geocentro. In questo lavoro
adotteremo questa concezione a “torrente centrale”, risalente a Johann Bernoulli, e
tenteremo un primo passo verso la conoscenza dei parametri caratterizzanti l’etere: densità,
velocità, portate.SubmittedONLINE1T. Struttura della Terr
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