993 resultados para ti-modified columbite route
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There were few guides for travelers crossing Iowa in 1838 when it was organzied as a teritory, and traveler often becaome lost or wandered for out of their way. The 1838 Territorial Government authorized the first state roads and the federal government appropriated money to expedite the movement of soldiers. The Territorial governement ued the federal money for layin gout a road from Dubuque to Keokuk vis Iowa City and this was the beginning of what was to becaome a 112,000 mile system of roads and streets in Iowa. The original roads followed the high ground of the state and were known as ride roads; but as the state was settled, roads befan to follow section line to accomodate landowners.
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The development of new rail systems in the first part of the 21st century is the result of a wide range of trends that are making it increasingly difficult to maintain regional mobility using the two dominant intercity travel modes, auto and air. These trends include the changing character of the economic structure of industry. The character of the North American industrial structure is moving rapidly from a manufacturing base to a service based economy. This is increasing the need for business travel while the increase in disposable income due to higher salaries has promoted increased social and tourist travel. Another trend is the change in the regulatory environment. The trend towards deregulation has dramatically reduced the willingness of the airlines to operate from smaller airports and the level of service has fallen due to the creation of hub and spoke systems. While new air technology such as regional jets may mitigate this trend to some degree in medium-size airports, smaller airports will continue to lose out. Finally, increasing environmental concerns have reduced the ability of the automobile to meet intercity travel needs because of increased suburban congestion and limited highway capacity in big cities. Against this background the rail mode offers new options due to first, the existing rail rights-of-way offering direct access into major cities that, in most cases, have significant capacity available and, second, a revolution in vehicle technology that makes new rail rolling stock faster and less expensive to purchase and operate. This study is designed to evaluate the potential for rail service making an important contribution to maintaining regional mobility over the next 30 to 50 years in Iowa. The study evaluates the potential for rail service on three key routes across Iowa and assesses the impact of new train technology in reducing costs and improving rail service. The study also considers the potential for developing the system on an incremental basis. The service analysis and recommendations do not involve current Amtrak intercity service. That service is presumed to continue on its current route and schedule. The study builds from data and analyses that have been generated for the Midwest Rail Initiative (MWRI) Study. For example, the zone system and operating and capital unit cost assumptions are derived from the MWRI study. The MWRI represents a cooperative effort between nine Midwest states, Amtrak and the Federal Railroad Administration (FRA) contracting with Transportation Economics & Management Systems, Inc. to evaluate the potential for a regional rail system. The 1 The map represents the system including the decision on the Iowa route derived from the current study. Iowa Rail Route Alternatives Analysis TEMS 1-2 system is to offer modern, frequent, higher speed train service to the region, with Chicago as the connecting hub. Exhibit 1-1 illustrates the size of the system, and how the Iowa route fits in to the whole.
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Aménagé en 1988 dans une zone de chablis de la forêt des Vuargnes au Chalet-à- Gobet (Lausanne), l'étang de la Bressone est rapidement devenu un site d'importance régionale pour les batraciens. Chaque année, ce sont plusieurs milliers de batraciens (Bufo bufo, Rana temporaria et Mesotriton [Triturus] alpestris) qui traversent la Route des Paysans pour aller s'y reproduire. Dès 1993, une opération de sauvetage et de suivi des migrateurs a été mise en place là où une forte mortalité amphibienne était observée. Le suivi sur plus de 10 ans a permis de clarifier la démographie des espèces migratrices et d'évaluer leur viabilité. L'analyse phénologique des migrations a également permis d'identifier une avance de deux semaines des dates de migrations, évolution compatible avec un réchauffement climatique. En 2005, un passage inférieur permanent (ou crapauduc) a été aménagé par la ville de Lausanne dans le cadre de sa politique de développement durable Agenda 21. Plus de 75% des batraciens migrant au travers de la Route des Paysans empruntent désormais ce passage qui assure la pérennité des populations d'amphibiens.
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Background: Leishmaniasis is a common parasitic disease in Southern Europe, caused by Leishmania infantum. The failures of current treatment with pentavalent antimonials are partially attributable to the emergence of antimony-resistant Leishmania strains. This study analyses the in vitro susceptibility to pentavalent antimony of intracellular amastigotes from a range of L. infantum strains, derived from the same infected animal, during in vitro and in vivo passages and after host treatment with meglumine antimoniate. Results: SbV-IC50 values for strains from two distinct isolates from the same host and one stock after two years of culture in NNN medium and posterior passage to hamster were similar (5.0 ± 0.2; 4.9 ± 0.2 and 4.4 ± 0.1 mgSbV/L, respectively). In contrast, a significant difference (P < 0.01, t test) was observed between the mean SbV-IC50 values in the stocks obtained before and after treatment of hosts with meglumine antimoniate (4.7 ± 0.4 mgSbV/L vs. 7.7 ± 1.5 mgSbV/L). Drug-resistance after drug pressure in experimentally infected dogs increased over repeated drug administration (6.4 ± 0.5 mgSbV/L after first treatment vs. 8.6 ± 1.4 mgSbV/L after the second) (P < 0.01, t test). Conclusions: These results confirm previous observations on strains from Leishmania/HIV co-infected patients and indicate the effect of the increasing use of antimony derivatives for treatment of canine leishmaniasis in endemic areas on the emergence of Leishmania antimony-resistant strains.
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Determination of the proper length of the tubular prosthesis is a major issue when performing a systemic-pulmonary artery shunt. The procedure is simplified by using a prosthesis with accordionlike properties. This was demonstrated in 7 consecutive infants with complex congenital heart defects, in whom systemic-pulmonary artery shunts were placed without early or late complications.
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Référence bibliographique : Weigert, 173
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Référence bibliographique : Weigert, 628
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To date there have been few investigations of the substructures in low-volume road (LVR) bridges. Steel sheet piling has the potential to provide an economical alternative to concrete bridge abutments, but it needs investigation with regard to vertical and lateral load resistance, construction methods, and performance monitoring. The objectives of this project were to develop a design approach for sheet pile bridge abutments for short-span low-volume bridges, formulate an instrumentation and monitoring plan to evaluate performance of sheet pile abutment systems, and understand the cost and construction effort associated with building the sheet pile bridge abutment demonstration project. Three demonstration projects (Boone, Blackhawk, and Tama Counties) were selected for the design, construction, and monitoring of sheet pile abutments bridges. Each site was unique and required site-specific design and instrumentation monitoring. The key findings from this study include the following: (1) sheet pile abutment bridges provide an effective solution for LVR bridges, (2) the measured stresses and deflection were different from the assumed where the differences reflect conservatism in the design and the complex field conditions, and (3) additional research is needed to optimize the design.
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Iowa has about 22,936 bridges on low-volume roads (LVRs). Based on the National Bridge Inventory data, 22 percent of the LVR bridges in Iowa are structurally deficient, while 5 percent of them are functionally obsolete. The substructure components (abutment and foundation elements) are known to be contributing factors for some of these poor ratings. Steel sheet piling was identified as a possible long-term option for LVR bridge substructures; but, due to lack of experience, Iowa needed investigation with regard to vertical and lateral load resistance, construction methods, design methodology, and load test performance. This project was initiated in January 2007 to investigate use of sheet pile abutments. *************Tech Transfer Summary. For full report see: http://publications.iowa.gov/id/eprint/14832*************
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This prospective study addresses early results of the treatment of acute acetabular fractures in elderly patients by total hip arthroplasty and cerclage wiring.Fifteen patients with an average age of 81 years were treated at our institution between February 1998 and December 2000. There were two transverse fractures, eight T-shaped fractures, two transverse fractures with associated posterior wall fracture, two posterior column fractures with associated posterior wall fracture, and one fracture of both columns. Treatment consisted of cerclage wiring of the fracture and primary non-cemented total hip replacement.All of the patients were followed for a mean of 36 months. Although there was one patient with three hip dislocations during the first 10 months after the operation, we found an excellent or good result for the entire group. During this relatively short follow-up period, we have not found a radiological loss of fracture reduction of more than 1 mm or a cup migration of more than 3.2 mm. All of the fractures healed and no loosening of the implant was evident.Primary total hip arthroplasty combined with internal fixation is a valid treatment option for acetabular fractures in the elderly. Preliminary results are convincing, but a bigger patient population and a longer follow-up time are necessary before we are able to draw final conclusions.
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