4,526 research outputs found
Reduced port surgery for UC
No full textIntroduction: Reduced-port laparoscopic surgery is a novel minimally invasive surgery. However, reduced-port surgery for ulcerative colitis (UC) remains controversial. Here, we describe the clinical outcomes of single-incision plus one port laparoscopic surgery (SILS + 1) for medically uncontrolled UC. Methods: Between May 2011 and September 2014, 10 UC patients underwent SILS + 1 port surgery. All procedures were performed with the use of a SILS port and either a 5-mm or a 12-mm port placed at the planned ileostomy site. Results: The median age of patients was 32 years (range, 22-53 years). Six patients underwent two-stage SILS + 1 port restorative proctocolectomy with ileal pouch-anal anastomosis, two patients underwent SILS + 1 total proctocolectomy, and the remaining two patients underwent SILS + 1 subtotal colectomy with subsequent three-stage SILS + 1 ileal pouch-anal anastomosis. The median operative time was 363.1 min (range, 253-465 min) and the median estimated blood loss was 29 mL (range, 0-100 mL). There were no conversions or additional ports required. Two patients previously underwent SILS + 1 subtotal colectomy, and in one of those patients, SILS + 1 ileal pouch-anal anastomosis was performed successfully 6 months after the previous surgery. There were no intra-abdominal adhesions, and no extra wounds were necessary because the previous stoma site had been used to access the SILS port. The median postoperative period was 24 months, during which five patients had their ileostomies closed. No patients reported occasional minor daily soiling or the need to wear a pad. Conclusion: Reduced-port laparoscopic surgery for medically uncontrolled UC is a feasible and safe procedure when performed by skilled surgeons
In the Padded Closet: Thoughts on a Secret Life
No full textThe author highlights their personal experience with several mental issues as a law student as UC Hastings. This piece explains one\u27s approach to the battling the societal and legal issues through their secret battle against mental illness
Power-Capacity and Ramp-Capability Reserves for Wind Integration in Power-Based UC
No full textThis paper proposes a power-based network-constrained unit commitment (UC) model as an alternative to the traditional deterministic UCs to deal with wind generation uncertainty. The formulation draws a clear distinction between power-capacity and ramp-capability reserves to deal with wind production uncertainty. These power and ramp requirements can be obtained from wind forecast information. The model is formulated as a power-based UC, which schedules power-trajectories instead of the traditional energy-blocks and takes into account the inherent startup and shutdown power trajectories of thermal units. These characteristics allow a correct representation of unit's ramp schedule which define their ramp availability for reserves. The proposed formulation significantly decreases operation costs compared to traditional deterministic and stochastic UC formulations while simultaneously lowering the computational burden. The operation cost comparison is made through 5-min economic dispatch simulation under hundreds of out-of-sample wind generation scenarios
Who Or What Is Werethekau ‘Great of Magic’? A Problematic Inscription (UC 16639)
No full textIn this paper, I investigate the identity of Werethekau through a previously unpublished limestone block at the Petrie Museum (UC 16639). It is not recorded when or where this block was found; the context, a central and identifying feature for the archaeological discipline, is lost (Johnson 1999: 107). The Petrie Museum records do not include the method or date of acquisition. I will focus here on the following questions: What does this object represent? Who is Werethekau? Is it an epithet for a goddess, or a name for a material object, or for a goddess frequently associated with the coronation of the king? The discussion also introduces the approach on which I rely for the identification of the object and its chronology. A further aim in this publication is to bring the object to the attention of a wider readership of scholars of Egyptian archaeology in an attempt to find the missing parts
In the Padded Closet: Thoughts on a Secret Life
No full textThe author highlights their personal experience with several mental issues as a law student as UC Hastings. This piece explains one\u27s approach to the battling the societal and legal issues through their secret battle against mental illness
The Author, the IRS and Prepublication Expenditures
No full textAuthors have customarily deducted expenditures incurred in preparing a book for publication. The IRS has taken the position that such expenditures should be capitalized and then amortized. In the recent case of Faura v. Commissioner, the Tax Court allowed authors to deduct prepublication expenditures rather than capitalize them. In 1976, section 280 was added to the Internal Revenue Code by the 1976 Tax Reform Act. This section appears to require authors to capitalize prepublication expenditures for books. The Tax Reform Act of 1976 also contained section 2119 which allows authors to deduct prepublication expenditures until regulations are promulgated concerning them. To date, there is no solid authority on whether an author should capitalize post-1976 prepublication expenditures
Impact on Reserves and Energy Delivery of Current UC-based Market-Clearing Formulations
No full textReserves are playing each time a more important role due to the massive penetration of renewable energy sources nowadays. Operating reserves must be used for unforeseen events. All predictable events must be directly considered in the scheduling stage otherwise there will be an inefficient and unnecessary use of reserves that increases system operation costs and can even endanger the power system security. This paper presents a qualitative assessment of some widely used implicit assumptions in Unit Commitment (UC)-based Market-Clearing (MC) formulations. We show evidence of the impact on reserves and system security due to considering the use of energy blocks in the MC. In addition to this, we present the consequences on the reserve deployment due to the underlying accepted assumptions in UC-based MC formulations. Finally, we give some recommendations which must be incorporated in UC-based MC formulations in order to schedule and use the operating reserves efficiently
Real-time simulation Model of Ultracapacitors for Frequency Stability Support from Wind Generation
No full textThe frequency stability of the power system is challenged by the high penetration of power electronic interfaced renewable energy sources (RES). Energy storage systems (ESS) are used to supply extra power injection to enhance the frequency stability during a disturbance. This paper presents a novel approach for improving the frequency dynamics by incorporating a designed ultracapacitor (UC) with a fully decoupled wind power generation (FDWG) unit. To this aim, a suitable model implementation of UC for real-time simulations is presented. The model constitutes a parallel RC branch, which is appropriate for illustrating the relevant fast UC dynamics that occur within the first milliseconds of the time period of action for fast active-power frequency control services. The frequency performance achieved by the support of the FDWG equipped with UC is compared against the performance achieved by using electrical batteries. The comparison includes the application of droop-derivative frequency control.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Intelligent Electrical Power Grid
Improving the currency composition of external debt : applications in Indonesia and Turkey
No full textChanges in exchange rates affect both the level and the structure of a country's external debt. Indonesia's debt service increased from 10 percent in 1980 to 37 percent in 1986, largely because of the depreciation of the U.S. dollar and the fall in oil prices. Developed countries can hedge against exchange rate and commodity price changes by purchasing currency futures or other hedging instruments, but most developing countries do not have access to futures markets. They can, however, reduce their exposure by matching the currency composition of their external debt with the currency composition of the cash flows with which they service their debt. Using advanced econometric techniques, the authors analyze what the currency exposures might have been in Indonesia and Turkey, and suggest borrowing portfolios that might be effective in hedging these countries'terms of trade against exchange rate fluctuations. The results are promising for Indonesia, where the optimal currency portfolios might have resulted in a significant reduction in risk. The results are less satisfying for Turkey, although they do indicate possible research directions.Economic Theory&Research,Fiscal&Monetary Policy,Environmental Economics&Policies,TF054105-DONOR FUNDED OPERATION ADMINISTRATION FEE INCOME AND EXPENSE ACCOUNT,Macroeconomic Management
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INDELIBLY DAVIS: A Quarter-Century of UC Davis Stories...and Backstories
No full textA distinctly different kind of memoir, Indelibly Davis: A Quarter-Century of UC Davis Stories…and Backstories by UC Davis Chancellor Emeritus Larry Vanderhoef offers stories that will tell readers something new (and special) about the campus, that are relevant to its development and identity and that touch on its values and culture—on that special spirit that revered former UC President Clark Kerr believed set it apart from all other UC campuses. Chancellor Emeritus Vanderhoef has written about people who radiate that special Davis spirit…about wished-for do-overs…about conflicts (and responses)…about heartbreaking tragedy…about wing-and-a-prayer risk-taking…about the payoffs of patience and persistence…and about tough, principled decision-making (what his dad would call “having starch”).
“This lively and highly readable book is a distinctly different kind of memoir. Larry Vanderhoef makes UC Davis and its remarkable people the heart of his account of 25 years as a provost and chancellor—a choice that is beautifully vindicated by the power and insight of these stories. What emerges is a deeply engaging portrait of a university community and an academic leader for whom a life in higher education is not a career but a calling.”
—Patricia Pelfrey, UC historian and author “Larry tells full-bodied stories in a writing ‘voice’ that is inviting, unsparing, honest, self-effacing and still confident. Indelibly Davis is an engaging, illuminating read.”
—John Lescroart, New
York Times bestselling autho
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