Variable-speed air-forced cooler technology

Advanced air coolers are able to cool transformer oil more efficiently than older systems. Replacement or expansion of cooling plants by a new solution can lead to reduction of oil temperatures by several degrees and have a positive influence on the service lifetimes of oil and therefore transformers. Or, conversely, better coolers can – at the same oil temperatures – enhance the maximum performance of a transformer or allow it to operate at a higher average load. The upgrade or expansion of a cooling system in some cases can eliminate the need for immediate investment in a new transformer, or extend the life cycle of existing transformers

Improving Organizational Innovation Capability Through Effective Hiring and Retention—A literature Review Based Research

University of Minnesota M.S. thesis. December 2019. Major: Engineering Management. Advisor: Hongyi Chen. 1 computer file (PDF); vii, 129 pages.This thesis addresses critical problems that managers face when seeking to improve the innovative capability: hiring and retention of innovative individuals. Through literature review, a gap between the importance of effectively attracting, assessing, and retaining innovative employees and the lack of study in the field was identified. Through literature review, methods and models are discussed to help companies to attract, evaluate, and retain innovative individuals. Evaluation methods were reviewed to build a framework that helps management in the selection process of prospect employees with the goal of improving the organizational innovation capability. Existing evaluation methods were reviewed and combined into a framework that selects innovative individuals who can be placed within the right job and team, to improve company innovation capability. The mechanism to achieve innovative company image building was also explored with the goal of developing a candidate pool. A retention model was also discussed and suggested

Evaluating the reaction of selected maize cultivars (Zea mays L.) to corn stunt spiroplasma

Due to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to [email protected], referencing the URI of the item.Bibliography: leaves 20-21.Not availabl

In Vitro Evaluation of Flow Distribution in All-Region Perfusion during the Norwood Operation

Continuous all-region perfusion has the potential to reduce total body ischemia during the Norwood procedure. This technique involves placing cannulas in the innominate artery, descending aorta, and native aortic root, thus providing continuous flow to the whole body at mild hypothermia (32–34°C) during the entire operation. However, the cannulation strategy in this approach must be optimized to achieve adequate flow rates to all vascular beds. To ensure appropriate blood flow rates to three cannulas of different caliber supplied by two inflow pumps, a benchtop evaluation of comparative flow rates through branched cannulas with variable independent perfusion pressures was conducted. Two isolated vertical columns with outlets at 10 mmHg intervals to allow for adjustable perfusion pressures were filled with expired banked packed red blood cells and fresh frozen plasma. The main arterial line was bifurcated with an 8-Fr arterial cannula inserted at the base of one column and a 4-mm (outside diameter [OD]) olive tip cannula inserted at the base of the other column. Flow rates were measured on each branch of the ¼″ arterial lines. Under experimental cardiopulmonary bypass (CPB) perfusion pressures of 30–50 mmHg on the 8-Fr arterial cannula column, the branched olive tip cannula accommodated less than 25% of total flow at total flow rates of 50–700 mL/min. This fraction is insufficient to sustain adequate lower body perfusion. However, the olive tip flow fraction was found to be sufficient for coronary blood flow (5–20 mL/kg/min) when olive tip perfusion pressures close to average neonatal diastolic blood pressures (20–60 mmHg) were tested. For all-region perfusion during the Norwood operation, primary CPB arterial flow should be divided to the head and coronary circulation with an independent pump delivering flow to the descending aorta. This should avoid cerebral over-circulation and insufficient flow to the lower body

Baking Properties and Microstructure of Yeast-Raised Breads Containing Wheat Bran: Carrageenan Blends or Laminates

Breads prepared using a commercial prototype sponge-and·dough formulation with no added gluten and containing white wheat bran:carrageenan blends or white wheat bran:carragcenan laminates (I 0% by weight nour replacement) had acceptable loaf volumes and crumb grain scores. Doughs con taining white wheat bran:carragccnan blends had a hi gher water absorption and longer mi xing time than doughs con taining wheat bran: carragecnan laminates wi th the same quantity of carrageenan . The addi tion of carrageenan to doughs resu lted in a hi gher water absorpti on va lue compared to the doughs contai ning wheat bran only. Breads made wi th wheat bran:carragccnan ( 10% nou r repl acement) had enhanced loaf volume and improved crumb grain score compared to breads with comparable quantities of wheat bran. Scanning electron micrographs of the breads containing 10% flour replacement of the wheat bran :carrageenan blends or laminates may indicate that perforations of the gluten and gelatinized starch matrix in the wheat bran breads containing the carrageenan may be more uniform , and the perforations smaller than in breads containing untreated wheat bran at the same flour replacement level

Sustained Total All-Region (STAR) Perfusion: An Optimized Perfusion Strategy for Norwood Reconstruction

Early iterations of the Norwood procedure used aortic cross-clamping, myocardial arrest, and, sometimes, deep hypothermic circulatory arrest. The resulting hypothermia and prolonged ischemia caused frequent cardiac, neurologic, renal, and other end-organ dysfunctions. Our group describes a novel technique, sustained total all-region (STAR) perfusion, which circumvents these issues by providing continuous perfusion to the head, heart, and coronaries at temperatures of 32–34°C. A single DLP® straight venous cannula (Medtronic, Minneapolis, MN) is placed in the right atrium, and a DLP® pediatric arterial cannula, with a high-flow stopcock attached, is placed in the ascending aorta or innominate artery to provide flow to the head. A cardioplegia needle with walrus tubing is connected to the stopcock to provide flow to the coronary arteries. For lower body perfusion, an olive tip cannula is placed into the descending aorta lumen and attached to the 1/8″ line from the cardioplegia system which provides warm arterial blood flow. STAR perfusion allows the Norwood procedure to be completed with mild hypothermia and continuous perfusion to all vascular beds with reduced cardiopulmonary bypass as well as total operative times. This technique is successfully achieved with minimal changes to circuitry, minor modifications to heart–lung machine servoregulation and few additional cannulation disposables