Fish traps were investigated to understand the effects of season, bait type, trap size, and trap soak time on catch rates, catch composition, and trap loss rates from March 2004 to September 2005, to improve the perfo...Fish traps were investigated to understand the effects of season, bait type, trap size, and trap soak time on catch rates, catch composition, and trap loss rates from March 2004 to September 2005, to improve the performance and management of Kuwait＇s gargoor （cage style fish trap） fishery, which used to be the nation＇s most important one in terms of value and landings volume. Catch rates were the highest in April/May （5 8 kg/trap haul） and again in December （7 kg/trap haul）. Bait type and trap size also affected catch rates and species composition. Of the seven baits tested, the best catch rates, 〉5 kg/trap haul, occurred with cuttlefish （Sepia pharaonis）, but wolf-herring （Chiroeentrus dorab） and mullet （Liza klunzingeri） also produced good results （4-5 kg/trap haul）. Within the five tested sizes, the two largest-sized traps captured more fish and larger size fish. Analysis of variance （ANOVA） showed significant differences of catch rate among traps with different baits as well as among traps of different sizes. Duncan test further revealed these differences between two specific baits and sizes. Cluster Analysis of species composition showed more differences among different baits than among different trap sizes. Longer soak times did not result in larger catch rates, but increased trap loss. About 10-day soak time resulted in trap loss 7%, while 40-day soak time could result in a loss of around 20%. Consequently, it is recommended that the gargoor be checked every 10 or fewer days. The average overall catch rate during the study period was lower than that of 1980s （4.5 vs. 5.8 kg/trap haul）, indicating a possible decline offish abundance in Kuwait＇s waters. It is recommended that the number of gargoor fishing boats and gargoors from each boat should be limited to allow stock rehabilitation.展开更多
In this work, the authors thermodynamic equilibrium calculations developed a computer program in MATLAB of vapor-liquid multicomponent phases below the language for aqueous speciation and critical temperature of wat...In this work, the authors thermodynamic equilibrium calculations developed a computer program in MATLAB of vapor-liquid multicomponent phases below the language for aqueous speciation and critical temperature of water （647 K） and pressures up to 2 kilobar with two computational routines. The first routine calculates the aqueous speciation from the equations of mass balance, charge balance and mass action, forming a system of N equations and N unknowns describing the aqueous phase with N unknown chemical species, which is solved with Newton-Raphson method using the Debye-Hiickel and Bdotactivity coefficients that solved simultaneously with Henry＇s Law, the Soave-Redlich-Kwong equation of state and a Poynting correction term, calculate chemical potentials and composition of the phases of the system, which are used at the Ratchford-Rice flash routine that iteratively recalculates the distribution of gases in liquid, until convergence. The chemical composition data of gas and brine phases of production wells at standard conditions for 1998 and 2007 of the Los Humeros geothermal field are modeled in the described manner, deducing that fluids inside the pipes of the reservoir are corrosive and cause the precipitation of newly formed minerals such as iron and calcium sulfates and silica, at reservoir conditions.展开更多
Plasmopam viticola, a causal agent of grapevine downy mildew, is a widely distributed pathogen, which can cause destructive disease in field-grown grapevines. Although fungicides are used to treat the disease, fungici...Plasmopam viticola, a causal agent of grapevine downy mildew, is a widely distributed pathogen, which can cause destructive disease in field-grown grapevines. Although fungicides are used to treat the disease, fungicide-resistant strains have been emerging. In this study, we developed graphene oxide （GO）-Fe3O4 nanocomposites, which could effectively repress the germination of sporangia and inhibit the development of downy mildew. 50 μg mL^-1 GO-Fe3O4 showed excellent protective and fungiddal activities. 250 μg mL^-1 GO-Fe3O4 on grapevine leaves in the field could significantly decrease the severity of downy mildew, suggesting its potent curative effect. Moreover, GO-Fe3O4 had no significant toxic effects on grapevine plants even at the concentration twice that of the highest dosage （1000 μg mL^-1） used in this study. Our work suggested that GO-Fe3O4 would offer an important opportunity to develop new approach for controlling plant diseases.展开更多
基金Supported by the Kuwait Foundation for the Advancement of Science (KFAS)the Public Authority for Agriculture and Fisheries Resources(PAAFR)+1 种基金the Project of Investigation to Improve Kuwait’s Demersal Trap Fishery of Kuwait Institute for Scientific Research (KISR)which was conducted at the Mariculture and Fisheries Department of KISR
文摘Fish traps were investigated to understand the effects of season, bait type, trap size, and trap soak time on catch rates, catch composition, and trap loss rates from March 2004 to September 2005, to improve the performance and management of Kuwait＇s gargoor （cage style fish trap） fishery, which used to be the nation＇s most important one in terms of value and landings volume. Catch rates were the highest in April/May （5 8 kg/trap haul） and again in December （7 kg/trap haul）. Bait type and trap size also affected catch rates and species composition. Of the seven baits tested, the best catch rates, 〉5 kg/trap haul, occurred with cuttlefish （Sepia pharaonis）, but wolf-herring （Chiroeentrus dorab） and mullet （Liza klunzingeri） also produced good results （4-5 kg/trap haul）. Within the five tested sizes, the two largest-sized traps captured more fish and larger size fish. Analysis of variance （ANOVA） showed significant differences of catch rate among traps with different baits as well as among traps of different sizes. Duncan test further revealed these differences between two specific baits and sizes. Cluster Analysis of species composition showed more differences among different baits than among different trap sizes. Longer soak times did not result in larger catch rates, but increased trap loss. About 10-day soak time resulted in trap loss 7%, while 40-day soak time could result in a loss of around 20%. Consequently, it is recommended that the gargoor be checked every 10 or fewer days. The average overall catch rate during the study period was lower than that of 1980s （4.5 vs. 5.8 kg/trap haul）, indicating a possible decline offish abundance in Kuwait＇s waters. It is recommended that the number of gargoor fishing boats and gargoors from each boat should be limited to allow stock rehabilitation.
文摘In this work, the authors thermodynamic equilibrium calculations developed a computer program in MATLAB of vapor-liquid multicomponent phases below the language for aqueous speciation and critical temperature of water （647 K） and pressures up to 2 kilobar with two computational routines. The first routine calculates the aqueous speciation from the equations of mass balance, charge balance and mass action, forming a system of N equations and N unknowns describing the aqueous phase with N unknown chemical species, which is solved with Newton-Raphson method using the Debye-Hiickel and Bdotactivity coefficients that solved simultaneously with Henry＇s Law, the Soave-Redlich-Kwong equation of state and a Poynting correction term, calculate chemical potentials and composition of the phases of the system, which are used at the Ratchford-Rice flash routine that iteratively recalculates the distribution of gases in liquid, until convergence. The chemical composition data of gas and brine phases of production wells at standard conditions for 1998 and 2007 of the Los Humeros geothermal field are modeled in the described manner, deducing that fluids inside the pipes of the reservoir are corrosive and cause the precipitation of newly formed minerals such as iron and calcium sulfates and silica, at reservoir conditions.
基金supported by the National Natural Science Foundation of China (31501680 and 21277055)the Natural Science Foundation of Hebei Province (C2014407061 and C2014407008)PhD Research Startup Foundation of Hebei Normal University of Science and Technology (2013YB005)
文摘Plasmopam viticola, a causal agent of grapevine downy mildew, is a widely distributed pathogen, which can cause destructive disease in field-grown grapevines. Although fungicides are used to treat the disease, fungicide-resistant strains have been emerging. In this study, we developed graphene oxide （GO）-Fe3O4 nanocomposites, which could effectively repress the germination of sporangia and inhibit the development of downy mildew. 50 μg mL^-1 GO-Fe3O4 showed excellent protective and fungiddal activities. 250 μg mL^-1 GO-Fe3O4 on grapevine leaves in the field could significantly decrease the severity of downy mildew, suggesting its potent curative effect. Moreover, GO-Fe3O4 had no significant toxic effects on grapevine plants even at the concentration twice that of the highest dosage （1000 μg mL^-1） used in this study. Our work suggested that GO-Fe3O4 would offer an important opportunity to develop new approach for controlling plant diseases.
