Kind Of Obstruction Research Articles

Galois groups and prime divisors in random quadratic sequences

AbstractGiven a set $S=\{x^2+c_1,\dots,x^2+c_s\}$ defined over a field and an infinite sequence $\gamma$ of elements of S, one can associate an arboreal representation to $\gamma$ , generalising the case of iterating a single polynomial. We study the probability that a random sequence $\gamma$ produces a “large-image” representation, meaning that infinitely many subquotients in the natural filtration are maximal. We prove that this probability is positive for most sets S defined over $\mathbb{Z}[t]$ , and we conjecture a similar positive-probability result for suitable sets over $\mathbb{Q}$ . As an application of large-image representations, we prove a density-zero result for the set of prime divisors of some associated quadratic sequences. We also consider the stronger condition of the representation being finite-index, and we classify all S possessing a particular kind of obstruction that generalises the post-critically finite case in single-polynomial iteration.

Bike Lane Obstructions in Manhattan, New York City: Implications for Bicyclist Safety.

Over the past 5years, the number of regular cyclists in New York City (NYC) increased by ~ 140,000 to over 800,000 regular riders. Aiming to promote safe cycling, NYC has developed over 1000 miles of planned commuting and recreational bike paths across its five boroughs. Bike lane obstructions pose a safety risk to cyclists but the extent of such obstructions is unknown. The purpose of this cross-sectional study was to document the frequency and rate of obstructions in protected bike lanes throughout Manhattan, NYC. During the fall of 2018, bicycle obstructions were observed in ten zones of Manhattan, NYC. Three kinds of obstructions within the bicycle lanes were coded: object, pedestrian, and vehicle. A total of 233 obstructions in the protected bike lanes were observed in this study. Obstructions per zone ranged from 11 to 39. The most common type of obstruction was objects, which accounted for 53.2% (n = 124) of obstructions and ranged through zones from 2 to 22. People were the second most common obstruction, which accounted for 28.3% (n = 66) of the obstructions, with a range of 1-22. Vehicles accounted for the remaining 18.5% (n = 43) of the obstructions with a range of 1-9 throughout zones. Findings of this study indicate that, even in "protected" lanes, bikers may be forced into traffic or to approach parked cars, increasing the risk of being "doored."

Obstructed and channelized viscoplastic flow in a Hele-Shaw cell

A theoretical study is presented of the flow of viscoplastic fluid through a Hele-Shaw cell that contains various kinds of obstructions. Circular and elliptical blockages of the cell are considered together with stepwise contractions or expansions in slot width, all within the simplifying approximation of a narrow gap. Specific attention is paid to the flow patterns that develop around the obstacles, particularly any stagnant plugged regions, and the asymptotic limits of relatively small or large yield stress. Periodic arrays of circular contractions or expansions are studied to explore the interference between obstructions. Finally, viscoplastic flow through a cell with randomly roughened walls is examined, and it is shown that constructive interference of local contractions and expansions leads to a pronounced channelization of the flow. An optimization algorithm based on minimization of the pressure drop is derived to construct the path of the channels in the limit of relatively large yield stress or, equivalently, relatively slow flow.

Improvement of Lafortune-Lacrous Indoor Propagation Model at 1900 MHz Band

A new improvement approach to Lafortune-Lecours indoor propagation model is presented. Taking into consideration; different types of walls that have been not considered in the model. The concrete and brick walls cause considerable severe signal deterioration when they obstruct the transmission path of the signal. Improvement of the above mentioned model is achieved by computing the path loss through those kinds of obstructions by adding some parameters and terms to the existing model.

The Zipper Club: Greetings to Fellow Members

As regained consciousness after triple bypass surgery, imagined myself to be within a large metal cylinder, laboriously inching up one of its nearly smooth walls. Other people were there, but they were unaware of me. had to make my way alone. At first thought, Maybe this is what it's like to awaken from very heavy anesthesia. Afterward, it seemed to my wife and myself that what was doing was fighting for life. Each of us had some such experience. What does it mean? Where are we now? Last year, my son turned 50. During that same year, he had two hip replacements and a hernia operation. His comment was, I guess the warranty has expired. You and are now at a point in life well beyond the expiration of an imaginary warranty. Our question is whether we can keep the old jalopy on the road for several more years, for another several hundred miles. We are only too aware that no trade-in is available. Not long ago, the pills took were vitamins. Now the area next to the bathroom sink resembles a small pharmacy. There is Avodart to control PSA. Next to it is rat poison: since have atrial fibrillation, that is, very rapid and irregular heartbeat, Warfarin keeps my blood thin so as to forestall blood clots, and have blood drawn once a month to make sure that it is working. Another pill controls bad cholesterol. As someone who used to pig out on blue cheese dressing and butter, am happy to report that my bad cholesterol is now 60. In summary, you and each now have an MME: a medically monitored existence. There is a fantasy, perhaps especially among males, that the doctor can give us a pill that will make everything the way it used to be. have had to recognize that will never again be a shortstop on the high school baseball team, making one accurate throw after another to the first baseman, that am not again going to backpack in the Colorado Rockies with my son. Another fantasy is that after one more surgery, one more visit to the doctor, one more pill, our medical conditions will be stabilized and we will never again confront health emergencies. Alas, not true. Three days ago woke up with blurred vision. The possibilities are some kind of obstruction in the brain, apparently ruled out by a brain scan this morning; a disease cheerfully named giant cell arteritis, or a ministroke. believe we are at a stage of life where this kind of unsettling event must be expected. …

Differential effects of nasal continuous positive airway pressure on reversible or fixed upper and lower airway obstruction.

Our study was to assess whether there were differential effects of nasal continuous positive airway pressure (nCPAP) on different kinds of obstruction in either upper or lower airways in patients with chronic obstructive pulmonary disease (COPD). nCPAP (6 cmH2O for ten minutes) was applied to 7 patients with reversible extrathoracic upper airway obstruction (RUAO) and 3 patients with fixed extrathoracic upper airway obstruction (FUAO). Eighteen stable asthmatics, receiving methacholine challenge to induce a more than 20% reduction in FEV1, were randomly investigated for the effect of nCPAP or sham pressure on reversible lower airway obstruction. Nine stable COPD patients were enrolled to study the effect on irreversible lower airway obstruction. Maximal expiratory and inspiratory flow volume curves and dyspnoea scores were obtained before and after immediate withdrawal of nCPAP. In the RUAO group, nCPAP significantly improved stridor and dyspnoea scores, decreased the ratio of FEF50/FIF50 from 2.05 +/- 0.25 to 1.42 +/- 0.16, and increased peak inspiratory flow (PIF) as well as forced inspiratory vital capacity by 26 +/- 8% and 9 +/- 4%, respectively. In expiratory phase, there was no significant change in pulmonary functions. In asthmatics, nCPAP significantly reversed methacholine-induced bronchoconstriction increasing forced vital capacity by 10 +/- 3%, FEV1 by 15 +/- 4% and PIF by 32 +/- 11%. nCPAP significantly increased the response to bronchodilators. The improvement in airflow rate persisted for at least 5 min after nCPAP withdrawal and was highly correlated with the response to bronchodilators. There was no significant effect of nCPAP on airflow rate in COPD patients. Subjective dyspnoea score changes paralleled the pulmonary function improvement. We conclude that there are differential effects of nCPAP on airflow rates in patients with different nature of airway obstruction. Patients with airway obstruction caused by structural changes may not benefit from the use of nCPAP in improving airflow rates.

Alterações do líquido peritoneal em eqüinos com desconforto abdominal e suas relações com o tipo de lesão implantada e evolução após tratamento médico ou cirúrgico: análise de 74 casos

Este trabalho tem como objetivo interrelacionar o exame do líquido peritoneal de eqüinos com desconforto abdominal e a indicação terapêutica para estes animais, levando-se em consideração a localização do processo patológico, a presença ou não de estrangulamento vascular, o tratamento instituído e a característica do líquido peritoneal como transudato modificado ou exsudato. Para isso os autores trabalharam com 373 prontuários de eqüinos com desconforto abdominal, que foram atendidos no Hospital Veterinário da Faculdade de Medicina Veterinária e Zootecnia - UNESP- Botucatu, no período de 1985 a 1991. Destes prontuários, 98 foram selecionados, onde a abdominocentese e o exame do líquido peritoneal haviam sido realizados rotineiramente. Observou-se maior ocorrência de líquido peritoneal tipo exsudato do que transudato modificado. Independentemente da sede da lesão, as afecções que apresentaram estrangulamento vascular possuíram índices de sobrevivência menor, sendo que a maior ocorrência de estrangulamento vascular possuíram índices de sobrevivência menor que a maior ocorrência de estrangulamento vascular deu-se no intestino delgado. Houve melho índice de recuperação em animais com processos patológicos de intestino grosso. Entre os parâmetros estudados nos exames dos líquidos peritoneais, observou-se que a coloração sanguinolenta das amostras foi a que mais evidenciou a presença de estrangulamento vascular e isquemia intestinal. Por fim a citologia e a análise de líquido peritoneal não foram suficientes para diferenciar as várias causas de desconforto abdominal, devido às grandes variações de cada processo patológico entre si. Porem, salienta-se que quando associadas com a avaliação clínica do animal, podem nos evidenciar a necessidade de intervenção cirúrgica.

The micturitional urethral pressure profile.

The micturitional urethral pressure profile (MUPP) was recorded using a measuring catheter with two eyes, 250 mm apart, one for recording the bladder pressure, the other for the urethral pressure during continuous withdrawal during micturition. Fifteen normal male subjects and 48 male patients with infravesical obstruction were studied. By means of the MUPP, it was possible to determine whether the patient had an obstruction or not, to differentiate between various kinds of obstructions and to localise the obstruction in the urethra. Provided infravesical obstructions can be considered "near rigid" segments, the degree of obstruction can be calculated and expressed in terms of a diameter and an approximate resistance. The diameter and resistance values should, however, not be considered alone but be regarded as complementary to the pressure profile.

Obstruction respiratoire peranesthésique en cas de lymphome malin médiastinal

Three cases of asphyxia at the beginning of general anaesthesia for mediastinoscopy or biopsy of adenopathy are described in patients with malignant lymphoma. One of them died in spite of endobronchial intubation, artificial ventilation and steroids. The two others recovered when specific chemotherapy was added to the same symptomatic treatment. The risk of respiratory obstruction seems higher in non-Hodgkin than in Hodgkin lymphomas. This kind of obstruction is not relieved by an antiasthmatic therapy. Pulmonary lymphatic filtration may be hindered in case of mediastinal lymphoma, especially during anaesthetic induction, and pulmonary interstitial congestion may occur impeding gas propagation. Specific chemotherapy according to the histological type of the tumour may relieve the compression and respiratory obstruction in a few hours.

Jaundice.

Jaundice is caused by an increase in bilirubin in the blood. This can occur before the bilirubin is conjugated by the liver, or after the bilirubin has been conjugated. If the bilirubin has not yet ben conjugated, it will not be able to pass through lipid membranes and will not be soluble in water. Therefore it will not be present in urine. Increases in conjugated bilirubin by the liver, or problems in the conjugation itself. If the increase is conjugated bilirubin, the disorder lies within the outlet channels of the hepatocyte, or there is some kind of obstruction in the biliary outlet system. Within the liver itself, the most common causes of difficulty are acute and chronic hepatitis, alcoholic cirrhosis and drug-induced liver dysfunction. Extra-hepatic obstructions are usually associated with the gall bladder, but may result from tumors of sclerosing secondary to chronic bowel disease.

Gas-liquid Two-phase Flow in Double-Tubes-Annular-Passage with Flow Obstruction : 1st Report, Effect of Flow Obstruction on Minimum Film Thickness)

The effect of a flow obstruction was experimentally investigated on the minimum thickness of a water film formed on the outer surface of the inner tube of concentric double tubes, through an annular cross section of which air-water two-phase mixture flows vertically upward. The flow patterns concerned are slug, froth and annular flows. Two kinds of obstructions were used in this experiment ; one is a ring type obstruction and the other is a thin circular tube type spacer. The liquid film thickness is drastically decreased by the existence of a flow obstruction, i.e., to about 40 μm. The film thinning process and the dependency of film thickness upon flow patterns are found to be quite similar to those on the inner wall of a single circular tube with an obstruction . Furthermore, an increase in minimum film thickness near an obstruction is observed resulting from the existence of an upstream obstruction.

Studies on the mechanism determining the course of nerve fibers in tissue culture. II. The mechanism of fasciculation.

An attempt has been made to illustrate features of the growth cone of living nerve fibers precisely and especially the behavior of filopodia toward various kinds of obstructions in tissue culture, and to review the factors which determine nerve orientation. The following observations were made: 1. The filopodia of the outgrowing neurite touch or adhere to almost all kinds of obstacles, such as neuronal or non-neuronal cell elements, cell debris, glass, metal, starch, polyethylene paraffin and cholesterol. 2. There is some difference in the manner of contact or adhesion of filopodia attributable to the nature of the object.

Chronic Obstruction of the Small Intestine

THE literature is filled with accurate and, we may say, classical descriptions of the X-ray findings in duodenal ulcer and its differential diagnosis. Less accurate, and certainly less in agreement are the findings and their interpretation in conditions involving the second and third portions of the duodenum and the remainder of the small bowel. A great deal of controversy has arisen as to the conditions called chronic duodenal ileus and chronic ileal stasis—stagnation of opaque material in the duodenum and in the terminal portion of the ileum. There is such a large personal factor obviously present in the interpretations that one is almost bewildered by the divergent opinions voiced. There is a clear field of agreement and obvious sound sense in interpreting the findings of the opaque meal study in cases of congenital or neoplastic obstruction of the duodenum or remaining small bowel,—indeed, with any kind of obstruction where there is evident blocking of the lumen of the bowel, with accumulation of opaq...