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Minimally invasive spleen-preserving distal pancreatectomy: Does splenic vessel preservation have better postoperative outcomes? A systematic review and meta-analysis

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Hepatobiliary & Pancreatic Diseases International 2015年第4期14卷 346-353页

作者： Fady Elabbasy Rahul Gadde Mena M Hanna danny sleeman Alan Livingstone danny Yakoub Division of Surgical Oncology Department of Surgery Sylvester Comprehensive Cancer Center University of Miami-Miller School of Medicine

BACKGROUND： Minimally invasive spleen-preserving distal pancreatectomy （SPDP） can be performed with either splenic vessel preservation （SVP） or resection [Warshaw procedure （WP）]. The aim of this study was to evaluate the postoperative clinical outcomes of patients undergoing both methods. DATA SOURCES： Database search of PubMed, Embase, Scopus, Cochrane, and Google Scholar was performed （2000-2014）; key bibliographies were reviewed. Qualified studies compar- ing patients undergoing SPDP with either SVP or WP, and as- sessing postoperative complications were included. Calculated pooled risk ratio （RR） with the corresponding 95% confidence interval （CI） by random effects methods were used in the meta-analyses. RESULTS： The search yielded 215 studies, of which only 14 observational studies met our selection criteria. The studies included 943 patients in total; 652 （69%） underwent SVP and 291 （31%） underwent WP. Overall, there was a lower incidence of splenic infarction （RR=0.17; 95% Ch 0.09-0.33; P〈0.001）, gastric varices （RR=0.16; 95% Ch 0.05-0.51; P=0.002）, and intra/postoperative splenectomy （RR=0.20; 95% Ch 0.08-0.49; P〈0.001） in the SVP group. There was no difference in in- cidence of pancreatic fistula （WP vs SVP, 23.6% vs 22.9%;P=0.37）, length of hospital stay, operative time or blood loss. There was moderate cross-study heterogeneity. CONCLUSIONS： SVP is a safe, efficient and feasible technique that may be used to preserve the spleen. WP may be more suit- able for large tumors dose to the splenic hilum or those associ- ated with splenomegaly. Randomized clinical trials are justified to examine the long-term benefits of SVP-SPDP.

关键词： splenic infarction spleen-preserving distal pancreatectomy splenic vessel preservation Warshaw procedure gastric varices

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Biliary-colonic fistula caused by cholecystectomy bile duct injury

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Hepatobiliary & Pancreatic Diseases International 2013年第4期12卷 443-445页

作者： Francisco Igor B Macedo Victor J Casillas James S Davis Joe U Levi danny sleeman Dewitt Daughtry Family Department of Surgery University of Miami Miller School of Medicine and Ryder Trauma Center/Jackson Memorial HospitalMiami Florida USA Department of Radiology University of Miami Miller School of Medicine and Ryder Trauma Center/Jackson Memorial HospitalMiami Florida USA

Biliary-colonic fistula is a rare complication after laparoscopic cholecystectomy. We present a case of post-cholecystectomy iatrogenic biliary injury that resulted in a fistula between the common hepatic duct and large bowel. Magnetic resonance cholangiopancreatography provided good visualization of injury even with concurrent normal level of alkaline phosphatase. Radiologic findings and surgical management of this condition are discussed in detail.

关键词： cholecystectomy magnetic resonance imaging biliary tract disease

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Role of magnetic resonance cholangiopancreatography in diagnosing choledochal cysts: Case series and review

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World Journal of Radiology 2013年第8期5卷 304-312页

作者： Vikas Y Sacher James S Davis danny sleeman Javier Casillas Department of Surgery University of Miami Department of Radiology University of Miami

AIM:To determine the merits of magnetic resonance cholangiopancreatography(MRCP) as the primary diagnostic test for choledochal cysts(CC’s).METHODS:Between 2009 and 2012,patients who underwent MRCP for perioperative diagnosis were *** information,clinical characteristics,and radiographic findings were *** results were compared with intraoperative findings.A PubMed search identified studies published between 1996-2012,employing MRCP as the primary preoperative imaging and comparing results with either endoscopic retrograde cholangiopancreatography(ERCP) or operative *** rates for CC’s and abnormal pancreaticobiliary junction(APBJ) were *** addition detection rates for clinically related biliary pathology like choledocholithiasis and cholangiocarcinomas in patients diagnosed with CC’s were also ***:Eight patients were identified with CC’*** patients out of them had typeⅣCC’s,1 had type I and 1 had a new variant of choledochal cyst with confluent dilatation of the common bile duct(CBD) and cystic *** patients had an APBJ and 3 of those had a long *** were found in 2 patients,1 had a CBD stone,and 1 pancreatic-duct stone was also *** all cases,MRCP successfully identified the type of CC’s,as well as APBJ with ductal *** analyzing the literature,we found that MRCP has 96%-100% detection rate for CC’***,we found that the range for sensitivity,specificity,and diagnostic accuracy was 53%-100%,90%-100% and 56%-100% in diagnosing ***’s detection rate was 100% for choledocholithiasis and 87% for cholangiocarcinomas with concurrent CC’***:After initial ultrasound and computed tomography scan,MRCP should be the next diagnostic test in both adult and pediatric *** should be reserved for patients where therapeutic intervention is needed.

关键词： Magnetic resonance cholangiopancreatography Choledochal cyst Abnormal pancreaticobiliary junction Diagnostic test Choledocholithiasis Cholangiocarcinomas

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A numerical Hartree self-consistent field calculation of an autoionization resonance parameters for a doubly excited 2s^2, 3s^2, and 4s^2 states of He atom with a complex absorbing potential

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Chinese Physics B 2017年第8期26卷 114-122页

作者： Tsogbayar Tsednee danny L Yeager Department of Chemistry Texas A & M University College Station

The self-consistent Hartree-Fock equation for the He atom is solved using the pseudospectral method. The Feshbach- type autoionization resonance parameters for doubly excited 2s2, 3s2, and 4s2 IS states of He have been determined by adding a complex absorbing potential to the Hamiltonian. The Riss-Meyer iterative and Pad6 extrapolation methods are applied to obtain reliable values for the autoionization resonance parameters, which are compared to previous results in the literature.

关键词： self-consistent field Hartree-Fock equation helium autoionization pseudospectral method

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The next generation models for crops and agro-ecosystems

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Science China(Information Sciences) 2011年第3期54卷 589-597页

作者： THOLEN danny Plant Systems Biology Group CAS-MPG Partner Institute and Key Laboratory for Computational BiologyShanghai Institutes for Biological SciencesChinese Academy of Sciences

Growth in population, decrease in arable land area, and change in climate are endangering our food security. Precision agriculture has the potential to increase crop productivity thorough tailored agricultural practices for different growing areas. Many models of crops and agro-ecosystems capable of predicting interaction between plants and environments have been developed for precision agriculture. Currently, there are several representative categories of crop and agro-ecosystem models, including the de Wit school models, the DSSAT series models and the APSIM series models, which have contributed substantially to improvement of agricultural practices. However, these models are weak in predicting performances of crops under environmental and genetic perturbations are generally weak, which severely limits the application of these models in guiding precision agriculture. We need to develop the next generation crop and agro-ecosystems models with a high level of mechanistic basis, which can be integrated with high throughput data and can predict the heterogeneity of environmental factors inside canopy and dynamic canopy photosynthesis. In developing such a model close collaboration is inevitably required among scientists from different disciplines. The successful development and application of such models will undoubtedly advance precision agriculture through providing better agronomical practices tailored for different growing environments. These models will also form a basis to identify breeding targets for increased productivity at given location with given soil and climatic conditions.

关键词： crop models ecosystem models crop yields nonlinear analysis photosynthesis

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Biofilter:a promising tool for mitigating methane emission from manure storage

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Journal of Arid Land 2011年第1期3卷 61-70页

作者： Nazim CICEK danny MANN Department of Biosystems Engineering University of Manitoba

Liquid manure storage may contribute to methane （CH4） emission and this emission can be greatly reduced if appropriate management practices are applied. Biofiltration has been used in other fields for mitigating greenhouse gas （GHG） emission （e.g., landfill） and shown promise for mitigation OH4 emis- sion from liquid manure storage. It has been reported that biofilter was capable of reducing 80% of CH4 emissions from manure storage. The OH4 removal efficiency is influenced by many factors, including OH4 and 02 concentrations, temperature, moisture, composition of the filter bed, nutrient, and empty bed resi- dency time （EBRT）. Biological conversion of methane of a biofilter is a slow process due to the low water solubility of methane. The residence times （EBRT） between 5 min and 5 h have been used, whereas a typical EBRT of 25 s is used for common biofilter applications. Temperature at which methanotrophic bac- teria are active ranges from 10℃ to 45℃. The maximum activity is found at around 30℃. The optimal filter bed water content depends on both the gas flow rate and the type of filter bed （soil, compost, etc.） and ranges from 30%-70% of the water holding capacity. Compost is the best material for filter bed. The optimal pH for methanotrophic bacteria is neutral to slightly acidic. Copper and nitrogen compounds especially nitrate are important nutrients to methanotrophic bacteria but their optimal concentrations have not been founded. Phosphorus and other elements such as potassium and manganese are reported to affect the performance of methanotrophic bacteria but need further confirmation.

关键词： biofilter greenhouse gas methane manure storage

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Modeling multicomponent ion transport to investigate selective ion removal in electrodialysis

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Environmental Science and Ecotechnology 2020年第1期1卷 48-56页

作者： Soraya Honarparvar danny Reible Department of Chemical Engineering Texas Tech UniversityLubbockTX79409-3121USA Department of Civil Environmentaland Construction EngineeringTexas Tech UniversityLubbockTX79409-1023USA

A 2-dimensional multicomponent ion transport model based on Nernst-Planck(NP)equation and electroneutrality assumption is developed for an electrodialysis(ED)cell operated in the ohmic *** flow in channels are assumed incompressible,isothermal,and *** equilibrium and flux continuity are considered at ionexchange membrane(IEM)-solution *** account for tortuosity effects inside membranes,effective ionic diffusion coefficients are calculated using membranes water volume *** developed multicomponent model is used to elucidate the effects of feed solution properties,cell properties,system hydrodynamics,operational conditions,and membrane properties on selective divalent ion removal in the *** results indicate that the selective removal of divalent ions improves with decreasing the cell length,imposed potential,and ionic strength of feed *** mixing in spacer-filled cell also promotes selective divalent ion *** concentrations of fixed charges on the membranes results in greater selectivity toward divalent ions at short cell length and low imposed *** equal concentrations of fixed charges,membranes with high water content are less favorable for selective divalent ion *** developed framework enables the optimum selection of cell design,IEMs,spacer design,and operational conditions to selectively remove ions from multicomponent solutions.

关键词： Electrodialysis Ion transport modeling Multicomponent solution Selective ion removal Scale precipitation

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Plausibility in Early Stages of Architectural Design: A New Tool for High-Rise Residential Buildings

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Tsinghua Science and Technology 2009年第3期14卷 327-332页

作者： Dirk Donath danny Lobos Chair of Computer Science in Architecture Faculty of Architecture Bauhaus-UniversityWeimar 99423 Germany

This paper analyzes the problem of the design of envelopes for high-rise isolated residential buildings. The phenomenon of envelope creation appears in the early stages of the architectural design. Variables that influence the final shape and size of such envelopes are then identified. This paper presents the state-of-the-art tools for the current solutions at the commercial and academic/scientific level. The variables identified in this research are the client＇s needs, the urban code and architectural practice, and their specific components for the final creation of a new decision support system tool based on the building information modeling （BIM） software platform, to facilitate the work in the project development and drawing production stages. This tool generates several options for building envelopes according to the parameters required by the city Zoning Planning Commission. These options then lead to deliver reliable data and a geometry that can be analyzed in a timely fashion by the engineers, builders, architects, government, and clients in the early stages of the building＇s design. The results show that use of specific information and communication technologies （ICT） tools in the early stages of a building design helps reduce the working time, increases confidence in the generated solution, and contributes to the exploration of alternatives in a short period of time.

关键词： constraint based design parametric programming urban modeling optimization architectural design

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Automated calculation and convergence of defect transport tensors

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npj Computational Materials 2020年第1期6卷 89-95页

作者： Thomas D.Swinburne danny Perez Aix-Marseille Université CNRSCINaM UMR 7325Campus de LuminyMarseille 13288France Theoretical Division T-1 Los Alamos National LaboratoryLos AlamosNM 87545USA

Defect diffusion is a key process in materials science and catalysis,but as migration mechanisms are often too complex to enumerate a priori,calculation of transport tensors typically have no measure of convergence and require significant end-user *** two bottlenecks prevent high-throughput implementations essential to propagate model-form uncertainty from interatomic interactions to predictive *** order to address these issues,we extend a massively parallel accelerated sampling scheme,autonomously controlled by Bayesian estimators of statewide sampling completeness,to build atomistic kinetic Monte Carlo models on a state-space irreducible under exchange and space group *** on isolated defects,we derive analytic expressions for drift and diffusion coefficients,providing a convergence metric by calculating the Kullback–Leibler divergence across the ensemble of diffusion processes consistent with the sampling *** autonomy and efficacy of the method is demonstrated on surface trimers in tungsten and Hexa-interstitials in magnesium oxide,both of which exhibit complex,correlated migration mechanisms.

关键词： convergence diffusion calculation

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Characterization and modeling of the temperature-dependent thermal conductivity in sintered porous silicon-aluminum nanomaterials

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Nano Research 2022年第6期15卷 5663-5670页

作者： danny Kojda Tommy Hofmann Natalia Gostkowska-Lekner Klaus Habicht Department Dynamics and Transport in Quantum Materials Helmholtz-Zentrum Berlin für Materialien und Energie GmbHBerlin D-14109Germany Institute of Physics and Astronomy University of PotsdamPotsdam D-14476Germany

Nanostructured silicon and silicon-aluminum compounds are synthesized by a novel synthesis strategy based on spark plasma sintering(SPS)of silicon nanopowder,mesoporous silicon(pSi),and aluminum *** interplay of metal-assisted crystallization and inherent porosity is exploited to largely suppress thermal *** and temperaturedependent thermal conductivity studies allow us to elucidate the impact of porosity and nanostructure on the macroscopic heat *** electron microscopy along with quantitative image analysis is applied to characterize the sample morphology in terms of domain size and interpore distance *** demonstrate that nanostructured domains and high porosity can be maintained in densified mesoporous silicon *** contrast,strong grain growth is observed for sintered nanopowders under similar sintering *** observe that aluminum agglomerations induce local grain growth,while aluminum diffusion is observed in porous silicon and dispersed nanoparticles.A detailed analysis of the measured thermal conductivity between 300 and 773 K allows us to distinguish the effect of reduced thermal conductivity caused by porosity from the reduction induced by phonon scattering at nanosized *** a modified Landauer/Lundstrom approach the relative thermal conductivity and the scattering length are *** relative thermal conductivity confirms the applicability of Kirkpatrick’s effective medium *** extracted scattering lengths are in excellent agreement with the harmonic mean of log-normal distributed domain sizes and the interpore distances combined by Matthiessen’s rule.

关键词： thermal conductivity mesoporous silicon porosity spark plasma sintering nanoscale modeling

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