74 research outputs found
The Arc Hydro MODFLOW Data Model
No full textin 2002 the Arc Hydro data model was published (Maidment, 2002). The data model is a representation of surface water data in an ArcGIS spatial database (geo-database). Arc Hydro has been highly successful and has been widely adopted in industry. over the past three years, we have been working to develop a ground water data model that is a companion to the surface water data model. This data model will also be published in a book titled Arc Hydro Groundwater that will document the data model and provide a series of sample applications. The data model is designed to support various types of ground water data, including well/borehole data, 3D representations of hydrostratigraphy, and data from simulation models (Strassberg et al., 2007). It will be fully compatible with the surface water data model and the two data models will share some components
Impact of water withdrawals from groundwater and surface water on continental water storage variations
No full textHumans have strongly impacted the global water cycle, not only water flows but also water storage. We have performed a first global-scale analysis of the impact of water withdrawals on water storage variations, using the global water resources and use model WaterGAP. This required estimation of fractions of total water withdrawals from groundwater, considering five water use sectors. According to our assessment, the source of 35% of the water withdrawn worldwide (4300 km3/year during 1998–2002) is groundwater. Groundwater contributes 42%, 36% and 27% of water used for irrigation, households and manufacturing, respectively, while we assume that only surface water is used for livestock and for cooling of thermal power plants. Consumptive water use was 1400 km3/year during 1998–2002. It is the sum of the net abstraction of 250 km3/year of groundwater (taking into account evapotranspiration and return flows of withdrawn surface water and groundwater) and the net abstraction of 1150 km3/year of surface water. Computed net abstractions indicate, for the first time at the global scale, where and when human water withdrawals decrease or increase groundwater or surface water storage. In regions with extensive surface water irrigation, such as Southern China, net abstractions from groundwater are negative, i.e. groundwater is recharged by irrigation. The opposite is true for areas dominated by groundwater irrigation, such as in the High Plains aquifer of the central USA, where net abstraction of surface water is negative because return flow of withdrawn groundwater recharges the surface water compartments. In intensively irrigated areas, the amplitude of seasonal total water storage variations is generally increased due to human water use; however, in some areas, it is decreased. For the High Plains aquifer and the whole Mississippi basin, modeled groundwater and total water storage variations were compared with estimates of groundwater storage variations based on groundwater table observations, and with estimates of total water storage variations from the GRACE satellites mission. Due to the difficulty in estimating area-averaged seasonal groundwater storage variations from point observations of groundwater levels, it is uncertain whether WaterGAP underestimates actual variations or not. We conclude that WaterGAP possibly overestimates water withdrawals in the High Plains aquifer where impact of human water use on water storage is readily discernible based on WaterGAP calculations and groundwater observations. No final conclusion can be drawn regarding the possibility of monitoring water withdrawals in the High Plains aquifer using GRACE. For the less intensively irrigated Mississippi basin, observed and modeled seasonal groundwater storage reveals a discernible impact of water withdrawals in the basin, but this is not the case for total water storage such that water withdrawals at the scale of the whole Mississippi basin cannot be monitored by GRACE
Application of Steven Strasberg's identification method of structures in laparoscopic cholecystectomies and reducing the risk of major bile duct injuries
No full textLaparoskopska kolecistektomija je jedna od najizvođenijih operacija u abdominalnoj kirurgiji u svijetu.Omogućuje rani oporavak i povratak svakodnevnim aktivnostima te je prihvaćena kao zlatni standard.Laparoskopska kolecistektomija i dalje ima višlju razinu ozljeda žučnih vodova (0.3-0,6%) nego kod otvorenih kolecistektomija (0.2 %).Rješenje za smanjivanje ozljeda žučnih vodova ponudio nam je Steven Strassberg sa suradnicima 1995 g. razvojem metode identifikacije cistične arterije i duktusa cistikusa koju naziva “critical view of safety”(CVS).Cilj ovog pregleda literature je ukazati na efikasnost metode identifikacije cistične arterije i duktusa cistikusa Stevena Strassberga u smanjivanju teških ozljeda bilijarnih struktura klasificiranih kao Strasberg D-E.Preglednim radom je obuhvaćeno 5150 laparoskopskih kolecistektomija gdje je “CVS” postignut na 4717 (91.59%).Na 5150 laparoskopskih
kolecistektomija došlo je do 2 teške ozljede žučnih vodova klasificirane kao Strassberg D(0.038%).Pregledom literature došlo se do zaključka kako “CVS” metoda identifikacije struktura Calotovog trokuta Stevena Strassberga osigurava niže postotke teških ozljeda žučnih vodova(Strassberg D-E) (44,24).Laparoscopic cholecystectomy is one of the most performed operations in abdominal surgery worldwide.It enables early recovery and return to daily activities and is accepted as the gold standard. Laparoscopic cholecystectomy still has a higher rate of bile duct injuries (0.3-0.6% ) than in open cholecystectomies (0.2%).The solution to reduction of bile duct injuries was offered by Steven Strassberg and colleagues in 1995. with method of identification of the cystic artery and cystic ductus,which is called "critical view of safety" (CVS).The aim of this literature review is to show the effectiveness of Steven Strassber’s a method of identifying cystic artery and cystic duct in reducing major bile duct injuries(Strassberg D-E).The literature review included 5150 laparoscopic cholecystectomies where "CVS" was achieved in 4717 (91.59%). Of the 5150 laparoscopic cholecystectomies, there were 2 major injuries to the bile ducts classified as Strassberg D (0.038%). The literature review concluded that the "CVS" method of identifying Calot's triangle structures by Steven Strassberg provides lower percentages of major bile duct injuries (Strassberg D-E) (44,24)
Application of Steven Strasberg's identification method of structures in laparoscopic cholecystectomies and reducing the risk of major bile duct injuries
No full textLaparoskopska kolecistektomija je jedna od najizvođenijih operacija u abdominalnoj kirurgiji u svijetu.Omogućuje rani oporavak i povratak svakodnevnim aktivnostima te je prihvaćena kao zlatni standard.Laparoskopska kolecistektomija i dalje ima višlju razinu ozljeda žučnih vodova (0.3-0,6%) nego kod otvorenih kolecistektomija (0.2 %).Rješenje za smanjivanje ozljeda žučnih vodova ponudio nam je Steven Strassberg sa suradnicima 1995 g. razvojem metode identifikacije cistične arterije i duktusa cistikusa koju naziva “critical view of safety”(CVS).Cilj ovog pregleda literature je ukazati na efikasnost metode identifikacije cistične arterije i duktusa cistikusa Stevena Strassberga u smanjivanju teških ozljeda bilijarnih struktura klasificiranih kao Strasberg D-E.Preglednim radom je obuhvaćeno 5150 laparoskopskih kolecistektomija gdje je “CVS” postignut na 4717 (91.59%).Na 5150 laparoskopskih
kolecistektomija došlo je do 2 teške ozljede žučnih vodova klasificirane kao Strassberg D(0.038%).Pregledom literature došlo se do zaključka kako “CVS” metoda identifikacije struktura Calotovog trokuta Stevena Strassberga osigurava niže postotke teških ozljeda žučnih vodova(Strassberg D-E) (44,24).Laparoscopic cholecystectomy is one of the most performed operations in abdominal surgery worldwide.It enables early recovery and return to daily activities and is accepted as the gold standard. Laparoscopic cholecystectomy still has a higher rate of bile duct injuries (0.3-0.6% ) than in open cholecystectomies (0.2%).The solution to reduction of bile duct injuries was offered by Steven Strassberg and colleagues in 1995. with method of identification of the cystic artery and cystic ductus,which is called "critical view of safety" (CVS).The aim of this literature review is to show the effectiveness of Steven Strassber’s a method of identifying cystic artery and cystic duct in reducing major bile duct injuries(Strassberg D-E).The literature review included 5150 laparoscopic cholecystectomies where "CVS" was achieved in 4717 (91.59%). Of the 5150 laparoscopic cholecystectomies, there were 2 major injuries to the bile ducts classified as Strassberg D (0.038%). The literature review concluded that the "CVS" method of identifying Calot's triangle structures by Steven Strassberg provides lower percentages of major bile duct injuries (Strassberg D-E) (44,24)
Application of Steven Strasberg's identification method of structures in laparoscopic cholecystectomies and reducing the risk of major bile duct injuries
No full textLaparoskopska kolecistektomija je jedna od najizvođenijih operacija u abdominalnoj kirurgiji u svijetu.Omogućuje rani oporavak i povratak svakodnevnim aktivnostima te je prihvaćena kao zlatni standard.Laparoskopska kolecistektomija i dalje ima višlju razinu ozljeda žučnih vodova (0.3-0,6%) nego kod otvorenih kolecistektomija (0.2 %).Rješenje za smanjivanje ozljeda žučnih vodova ponudio nam je Steven Strassberg sa suradnicima 1995 g. razvojem metode identifikacije cistične arterije i duktusa cistikusa koju naziva “critical view of safety”(CVS).Cilj ovog pregleda literature je ukazati na efikasnost metode identifikacije cistične arterije i duktusa cistikusa Stevena Strassberga u smanjivanju teških ozljeda bilijarnih struktura klasificiranih kao Strasberg D-E.Preglednim radom je obuhvaćeno 5150 laparoskopskih kolecistektomija gdje je “CVS” postignut na 4717 (91.59%).Na 5150 laparoskopskih
kolecistektomija došlo je do 2 teške ozljede žučnih vodova klasificirane kao Strassberg D(0.038%).Pregledom literature došlo se do zaključka kako “CVS” metoda identifikacije struktura Calotovog trokuta Stevena Strassberga osigurava niže postotke teških ozljeda žučnih vodova(Strassberg D-E) (44,24).Laparoscopic cholecystectomy is one of the most performed operations in abdominal surgery worldwide.It enables early recovery and return to daily activities and is accepted as the gold standard. Laparoscopic cholecystectomy still has a higher rate of bile duct injuries (0.3-0.6% ) than in open cholecystectomies (0.2%).The solution to reduction of bile duct injuries was offered by Steven Strassberg and colleagues in 1995. with method of identification of the cystic artery and cystic ductus,which is called "critical view of safety" (CVS).The aim of this literature review is to show the effectiveness of Steven Strassber’s a method of identifying cystic artery and cystic duct in reducing major bile duct injuries(Strassberg D-E).The literature review included 5150 laparoscopic cholecystectomies where "CVS" was achieved in 4717 (91.59%). Of the 5150 laparoscopic cholecystectomies, there were 2 major injuries to the bile ducts classified as Strassberg D (0.038%). The literature review concluded that the "CVS" method of identifying Calot's triangle structures by Steven Strassberg provides lower percentages of major bile duct injuries (Strassberg D-E) (44,24)
Characteristics of successful personal ads in a BDSM on-line community
No full textThe bondage, discipline, sadism, and masochism (BDSM) community today uses online personal ads as a major way for members to meet. Such communities have designed their on-line experience around the format of the once prevalent newspaper=magazine personals ads and often feature physical descriptions, personal pictures, and special interests listings. This study examines personal profiles posted on an on-line BDSM community, which allows for the examination of the type and content of these ads that may be the impetus for them to be ‘‘successful.’’ As such, this approach goes beyond traditionally studied aspects of personal ads from other mainstream groups (Paul et al. 2010; Rajecki et al. 1991; Strassberg and Holty 2003). This is achieved through an experimental approach of creating profiles to see which attract the most viewers; such an approach is fairly unique, although not completely new (Goode 1996a; Sitton and Blanchard 1995; Strassberg and Holty 2003). Content-analysis is also performed on the viewers of the experimental profiles in order to gauge common characteristics/content that users have on their profiles for the purported purpose of making themselves attractive for more views.Journal Articl
Rasendes Modellieren. Zur Rolle von Wissenschaft, Revolution und Serialität in Mo Yans Roman Wa (Frösche)
No full textSequential criteria for equicontinuity and uniformities on topological groups
No full textAbstractIt was asked by Itzkowitz in 1976 whether or not the equality of left and right uniformities on a locally compact group G could be decided by sequences. Twelve years later, the question was answered in the affirmative: For the left and right uniformities on G to be equal, it is necessary and sufficient that for each sequence (hn) in G and each neighborhood V of the identity e in G, the set ∩nϵNhn−1Vhn should be a neighborhood of e. Two independent proofs of this unexpected result were proposed, one in the spirit of set-theoretic topology (Pestov), and the other based on finite-dimensional Lie theory (Itzkowitz, Rothman, Strassberg and Wu). Shortly after, Hansel and Troallic referred to techniques of harmonic analysis to prove that a symmetric set B of automorphisms of G is equicontinuous if and only if the countable subsets of B are equicontinuous (G being endowed with its left uniformity). This substantially betters the aforementioned property, which can be obtained if B is chosen as the set of all inner automorphisms of G. In this paper, we re-examine the result and consider it in a maximal generality. We obtain the following basic property: Let X be a quasi-k-space (for example a locally compact space), Y a uniform space and H a subset of C(X,Y); then H is equicontinuous if and only if for each countable subset A of X and each countable subset D of H, the set D|A of restrictions to A of mappings of D is equicontinuous. Several applications of this criterion are given, among which a strengthened version of a well-known theorem of Corson and Glicksberg. In the last section, the technique is applied to the sets of inner automorphisms of topological groups, and a refinement of the result by Itzkowitz, Pestov, Rothman, Strassberg and Wu is obtained
A note on the real representations of SU(2,C)
No full textAbstractUsing elementary techniques structure maps are calculated for each of the irreducible complex representations of G=SU(2,C). For each odd dimensional irreducible complex representation ϱ:G→GL(n,C), the structure map obrtained is used to calculate a change of basis matrix that simultaneously conjugates each element of the complex matrix group ϱ(G) into a matrix having only real entries. Further, these structure maps are used to prove: for G=SU(2,C), if n is odd or is divisible by 4 then up to equivalence there is exactly one irreducible finite-dimensional real representation of dimension n, and there are none of degree divisible by 2 but not by 4
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