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Analysing the power transformer temperature limitation for avoidance of bubble formation

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High Voltage 2019年第3期4卷 210-216页

作者： James Hill Zhongdong Wang Qiang Liu Christoph Krause Gordon wilson The University of Manchester ManchesterM139PLUK Weidmann Electrical Technology AG Rapperswil-JonaCH 8640Switzerland National Grid WarwickCV346DAUK

Failure of a transformer is a costly incident which can impact power system operation and result in loss of supply to *** can fail through a number of mechanisms,one of which is from the formation of bubbles within the ***,the loading guidance is set to avoid certain overload temperatures as high temperature is the main cause of bubbles *** paper analyses the limit set within the loading guides,comparing the most commonly cited temperature limit of 140℃ with values taken from across the full spectra of available studies in *** is concluded that there is sufficient evidence for further investigation into formation of bubbles from transformer insulation as employing a single temperature limit may be *** of a single temperature value is unsuitable,given the wide range of potential scenarios that the transformer fleet can *** has become the go-to rationale that the moisture content of the solid insulation is the key driver for transformer bubbling *** is true,however,it is shown that other factors such as solid insulation aged condition(determined through degree of polymerisation value)and the insulation type are also important considerations.

关键词： insulation limit power

Plasticity in the antipredator behavior of the orange-footed sea cucumber under shifting hydrodynamic forces

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Current Zoology 2019年第6期65卷 685-695页

作者： Nicholas A.W.BROWN David R.wilson Patrick GAGNON Department of Ocean Sciences Memorial University of NewfoundlandSt.John'sNewfoundlandA1C 5S7Canada Department of Psychology Memorial University of NewfoundlandSt.John'sNewfoundlandA1B 3X9Canada

Marine invertebrates that move too slowly to evade unfavorable environmental change may instead exhibit phenotypic plasticity,allowing them to adjust to varying *** orange-footed sea cucumber Cucumaria frondosa is a slow-moving suspension feeder that is preyed on by the purple sunstar Solaster *** sea cucumber's antipredator behavior involves changing shape and detaching from the substratum,which might increase its probability of being displaced by water motion into an unsuitable *** hypothesized that sea cucumbers'antipredator responses would be diminished under stronger hydrodynamic forces,and that behavioral strategies would be flexible so that individuals could adjust to frequent changes in water *** a natural orange-footed sea cucumber habitat,individuals lived along a pronounced hydrodynamic gradient,allowing us to measure antipredator behavior under different water flow *** placed purple sunstars in physical contact with sea cucumbers living at various points along the gradient to elicit antipredator *** then repeated this procedure in a laboratory mesocosm that generated weak and strong hydrodynamic forces similar to those observed at the field *** in the mesocosm experiment were tested in both wave conditions to determine if their antipredator behavior would change in response to sudden environmental change,as would be experienced under deteriorating sea *** responses did not covary with hydrodynamic forces in the ***,antipredator responses in the mesocosm experiment increased when individuals were transplanted from strong to weak forces and decreased when transplanted from weak to strong ***,our results indicate environmentally induced plasticity in the antipredator behavior of the orange-footed sea cucumber.

关键词： behavioral plasticity benthic invertebrate predator-prey interaction reciprocal transplant experiment Solaster endeca.wave environment

Effect of hydrostatic pressure and polaronic mass of the binding energy in a spherical quantum dot

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Chinese Physics B 2015年第11期24卷 92-97页

作者： A.Rejo Jeice Sr.Gerardin jayam K.S.Joseph wilson Department of Physics Annai Velankanni College Department of Physics Holy Cross College Departmant of Physics Arul Anandar College (Autonomous)

Simultaneous effect of hydrostatic pressure and polaronic mass on the binding energies of the ground and excited states of an on-center hydrogenic impurity confined in a GaAs/GaA1As spherical quantum dot are theoretically investigated by the variational method within the effective mass approximation. The binding energy is calculated as a function of dot radius and pressure. Our findings proved that the hydrostatic pressure led to the decrease of confined energy and the increase of donor binding energy. Conduction band non-parabolicity and the polaron masses are effective in the donor binding energy which is significant for narrow dots not in the confined energy. The maximum donor binding energy achieved by the polaronic mass in the ground and excited states are 2%-19% for the narrow dots. The confined and donor binding energies approach zero as the dot size approaches infinity.

关键词： spherical quantum dot square well confinement confined energies effective mass approximation

Functionality of dietary antimicrobial peptides in aquatic animal health:Multiple meta-analyses

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Animal Nutrition 2023年第1期12卷 200-214页

作者： Jinhai Wang Alan E.wilson Baofeng Su Rex A.Dunham School of Fisheries Aquaculture and Aquatic SciencesAuburn University203 Swingle HallAuburnAL 36849USA

Effects of antimicrobial peptides(AMP)added to diets on aquatic animal health and body function are influenced by multiple factors such as animal species,initial body weight,the dosage of AMP and feeding ***,there is limited knowledge on the relationship between these factors and the body function of aquatic ***,we aimed to perform multiple meta-analyses to investigate the effects of dietary AMP on growth performance(feed conversion ratio[FCR],specific growth rate[SGR]),enzyme activity(superoxide dismutase activity[SOD],lysozyme activity[LSA]),disease resistance(cumulative survival rate[CSR],the expression of immune-related genes[GENE])and the abundance of gut microbiota(MICRO)from a pool of empirical ***,the dose-effect model was applied to determine the optimal AMP dose,initial body weight and feeding duration to maximize body *** conduct the meta-analyses,we included 34 publications that estimated 705 effect sizes across 21 fish,2 shrimp and 2 shellfish *** results confirmed that the inclusion of AMP in the diet can significantly improve SGR,SOD,LSA,CSR and GENE and decrease FCR for aquatic ***,our findings implied a slight positive effect of AMP on MICRO albeit with a limited number of studies available on fish gut microbial *** no significant linear or quadratic relationship was predicted by meta-regression,the dose-effect indicated that the optimal AMP doses for FCR,SGR,SOD and LSA were 707.5,750.0,1,050.0 and 937.5 mg/kg,*** together,fish with an initial body weight of 30 g could be fed with a dose of 600 to 800 mg/kg for 2 mo when AMP-supplemented diets were applied in aquaculture,which can effectively improve body function and health while lowering aquafeed *** addition,more studies should address fish gut microbiota to delimitate the influence of dietary AMP on MICRO in the future.

关键词： Fish AMP Oral administration Feed additive Dose-effect Immune

Antiseptic Efficacy of A Soap Made from Biosurfactants Isolated from Bacillus and Lactobacillus against Pathogenic Bacteria

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Advances in Microbiology 2024年第1期14卷 31-58页

作者： Frédéric Yannick Okouakoua Christian Aimé Kayath Nicaise Saturnin Mokémiabeka Varelle Bervanie Ngala Elenga Digne Nedjea N’goma-Mona Ndelani Nkalla Lambi Sandra Paola Elenga wilson Christ Dieuveil Bayakissa Malanda Rodinet Tsana Junior Patrick Sergy Bissoko1 Moïse Doria Kaya-Ongoto Duchel Jeanedvi Kinavouidi Etienne Nguimbi Laboratoire de Biologie Cellulaire et Molé culaire (BCM) Facult&eacute des Sciences et Techniques Universit&eacute Marien N’gouabi Brazzaville Congo Institut National de Recherche en Sciences Exactes et Naturelles (IRSEN) Avenue de l’Auberge Gascogne Brazzaville Congo

The aim of our study was to use a biosurfactant produced by Bacillus and Lactobacillus isolates as an antiseptic in the formulation of local soap. A total of 60 isolates were characterized by microbiological techniques (30 Bacillus and 30 Lactobacillus) and the ability to produce biosurfactants was demonstrated by a hydrocarbon emulsification index (E24). The emulsification indexes (E24) varied from 9% to 100% for Bacillus and from 33% to 100% for Lactobacillus as well. The antagonistic assay showed that biosurfactants were able to inhibit the formation of biofilms and growth of pathogens such as Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, Bacillus cereus, Salmonella typhirium, Shigella boydii and Proteus mirabilis. The biosurfactant consortium (BioC) from Bacillus consortium and from Lactobacillus was able to inhibit biofilm formation and the pathogens growth. The BioC was stable to alkaline pH and the temperatures stability of Biosurfactant was ranging from 50°C to 90°C. The soap was made by the cold saponification process using one biosurfactant consortium formulated. This soap has a pH of 10 and showed good cleaning power and good foam stability. Similarly, the soap showed good antiseptic power and disinfection power against all pathogens tested. Handwashing is critical to preventing disease transmission. The persistence of pathogens in waste water was evaluated. The BioS produced showed good disinfection power against all pathogens tested. The valor of reduction on the hands and in the waste water was significantly more than compared to the control soaps used. This soap could be used in the prevention, fighting, and treatment of bacterial and viral infections.

关键词： Antiseptic Soap Biosurfactants Bacillus Lactobacillus Disinfection Pathogens bacteria

Free-Trade Agreements in a Model of Trade, Migration and Politics

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Frontiers of Economics in China-Selected Publications from Chinese Universities 2018年第1期13卷 15-31页

作者： John Douglas wilson Ilkay Yilmaz Department of Economics Michigan State University East Lansing M1 48824 USA Department of Economics Mersin University Ciftlikkoy Yenisehir 33342 Mersin Turkey

This paper uses a probabilistic voting model to investigate voting for a free-trade agreement between a labor-abundant country and a capital-abundant country. Migration from the labor-abundant country to the capital-abundant country increases the probability of a free-trade agreement, with lower migration costs leading to more migration and a higher free-trade probability. On the other hand, if a lower probability of free trade is caused by an increased voter bias against free-trade candidates, then there is less migration. A dynamic extension of the model is also investigated.

关键词： free trade migration Heckscher-Ohlin labor-abundant capital-abundant

Contrast-enhanced ultrasound of focal liver masses

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Hepatoma Research 2020年第9期6卷 10-20页

作者： Stephanie R.wilson Christina Merrill Department of Radiology University of CalgaryCalgary T2N 2T9Canada Department of Radiology Foothills Medical CentreCalgary T2N 2T9Canada.

Non-invasive imaging is the current method of choice for the characterization of frequently discovered focal liver *** historically,contrast-enhanced computed tomography(CT)and magnetic resonance(MR)scans have been selected for this purpose,contrast-enhanced ultrasound(CEUS)now offers a less expensive and safer method to acquire the same *** with the intravenous injection of a microbubble contrast agent,CEUS provides some unique advantages that make it a valuable addition to an imaging *** is performed in dynamic real-time,providing superior temporal resolution compared to other modalities and allowing detection of enhancement regardless of its timing or *** is performed with a purely intravascular contrast agent,providing accurate depiction of the presence of microbubbles in the circulation in all phases of *** compares with CT and MR contrast agents,which have a well-recognized interstitial *** discordant imaging may occur especially in the portal venous phase,when CT and MR may show pseudoenhancement from interstitial contrast,while CEUS will accurately show washout in malignant ***,the contrast specific software used to perform CEUS has an excellent subtraction technique,which produces a contrast only image with high sensitivity to enhancement in thin septations and small *** makes a positive contribution to liver mass characterization in any situation.

关键词： Contrast-enhanced ultrasound liver cancer diagnosis

Successful Vaginal Delivery after Implantable Cardiac Defibrillator Placement for Management of Ventricular Tachycardia

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Congenital Heart Disease 2021年第2期16卷 137-139页

作者： Sara Moufarrij Manisha Gandhi wilson Lam Angeline Opina Department of Obstetrics and Gynecology Baylor College of MedicineHoustonUSA Department of Pediatric Cardiology Baylor College of MedicineHoustonUSA

A 23-year-old female with Tetralogy of Fallot who is 30w6d pregnant presented with palpitations and syncope from an outside *** was found to have ventricular *** placement of a transvenous implantable cardiac defibril... 详细信息

关键词： Ventricular tachycardia pregnancy intracardiac defibrillatory

Trace analysis of off-flavor/odor compounds in water using liquid-liquid microextraction coupled with gas chromatography--positive chemical ionization-tandem mass spectrometry

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Frontiers of Environmental Science & Engineering 2016年第3期10卷 477-481页

作者： Jian LU Paul S. WILLS P. CHRIS wilson Indian River Research and Education Center University of Florida/IFAS 2199 South Rock Road Fort Pierce FL 34945-3138 USA Harbor Branch Oceanographic Institute at Florida Atlantic University 5600 U.S. 1 North Fort Pierce FL 34946 USA

A rapid, inexpensive and laboratory friendly method was developed for analysis of off-flavor/odor compounds in fresh and salt water using gas chromatography with chemical ionization-tandem mass spectrometry. Off-flavor/odor compounds, included geosmin, 2- methylisobomeol （MIB）, 2-isobutyl-3-methyoxypyrazine （IBMP）, and 2-isopropyl-3-methoxypyrazine （IPMP）. Using this method, a single sample can be extracted within minutes using only 1 mL of organic solvent. The ion transitions for IPMP, IBMP, MIB, and geosmin were 153 〉 121, 167 〉 125, 152 〉 95, and 165 〉 109, respectively. The linearity of this method for analyzing MIB ranged from 4 to 200ng·L^-1, and from 0.8 to 200ng·L^-1 for the other analytes. Method recoveries ranged from 97% to 111% and percent relative standard deviations ranged from 3% to 9%, indicating that the method is accurate, precise, and reliable.

关键词： off-flavor/odor compounds liquid-liquid microextraction gas chromatography-tandem mass spectrometry