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Hydrodynamic Characteristics of Three Rows of Vertical Slotted Wall Breakwaters 被引量:5
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作者 Majed O. Alsaydalani Mohammed A. N. Saif Medhat M. Helal 《Journal of Marine Science and Application》 CSCD 2017年第3期261-275,共15页
In this study, we examine the hydrodynamic characteristics of three rows of vertical slotted wall breakwaters in which the front and middle walls are permeable and partially immersed in a water channel of constant dep... In this study, we examine the hydrodynamic characteristics of three rows of vertical slotted wall breakwaters in which the front and middle walls are permeable and partially immersed in a water channel of constant depth, whereas the third wall is impermeable. The wave–structure interaction and flow behavior of this type of breakwater arrangement are complicated and must be analyzed before breakwaters can be appropriately designed. To study the hydrodynamic breakwater performance, we developed a mathematical model based on the eigenfunction expansion method and a least squares technique for predicting wave interaction with three rows of vertical slotted wall breakwaters. We theoretically examined the wave transmission, reflection, energy loss, wave runup, and wave force under normal regular waves. Comparisons with experimental measurements show that the mathematical model results adequately reproduce most of the important features. The results of this investigation provide a better understanding of the hydrodynamic performance of triple-row vertical slotted wall breakwaters. 展开更多
关键词 slotted breakwaters mathematical models transmission coefficient reflection coefficient energy-loss coefficient wave runup wave force
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The impact of implementing HIV prevention policies therapy and control strategy among HIV and AIDS incidence cases in Malaysia 被引量:3
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作者 Ofosuhene O.Apenteng Prince P.Osei +2 位作者 Bismark Oduro Mavis Pearl Kwabla Noor Azina Ismail 《Infectious Disease Modelling》 2020年第1期755-765,共11页
Malaysia is faced with a high HIV/AIDS burden that poses a public health threat.We constructed and applied a compartmental model to understand the spread and control of HIV/AIDS in Malaysia.A simple model for HIV and ... Malaysia is faced with a high HIV/AIDS burden that poses a public health threat.We constructed and applied a compartmental model to understand the spread and control of HIV/AIDS in Malaysia.A simple model for HIV and AIDS disease that incorporates condom and uncontaminated needle-syringes interventions and addresses the relative impact of given treatment therapy for infected HIV newborns on reducing HIV and AIDS incidence is presented.We demonstrated how treatment therapy for new-born babies and the use of condoms or uncontaminated needle-syringes impact the dynamics of HIV in Malaysia.The model was calibrated to HIV and AIDS incidence data from Malaysia from 1986 to 2011.The epidemiological parameters are estimated using Bayesian inference via Markov chain Monte Carlo simulation method.The reproduction number optimal for control of the HIV/AIDS disease obtained suggests that the disease-free equilibrium was unstable during the 25 years.However,the results indicated that the use of condoms and uncontaminated needle-syringes are pivotal intervention control strategies;a comprehensive adoption of the intervention may help stop the spread of HIV disease.Treatment therapy for newborn babies is also of high value;it reduces the epidemic peak.The combined effect of condom use or uncontaminated needle-syringe is more pronounced in controlling the spread of HIV/AIDS. 展开更多
关键词 Mathematical transmission modeling HIV/AIDS incidence Interventions Bayesian inference Basic reproduction number
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Analysing the impact of migration on HIV/AIDS cases using epidemiological modelling to guide policy makers 被引量:1
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作者 Ofosuhene O.Apenteng Prince P.Osei +1 位作者 Noor Azina Ismail Aline Chiabai 《Infectious Disease Modelling》 2022年第1期252-261,共10页
In this paper,we present the impact of migration on the spread of HIV and AIDS cases.A simple model for HIV and AIDS that incorporates migration and addresses its contributions to the spread of HIV and AIDS cases was ... In this paper,we present the impact of migration on the spread of HIV and AIDS cases.A simple model for HIV and AIDS that incorporates migration and addresses its contributions to the spread of HIV and AIDS cases was constructed.The model was calibrated to HIV and AIDS incidence data from Malaysia.We explore the use of Markov chain Monte Carlo(MCMC)simulation method to estimate uncertainty in all the unknown parameters incorporated in our proposed model.Among the migrant population,1.5572e-01 were susceptible to HIV transmission,which constituted 67,801 migrants.A proportion of migrants,6.3773e-04,were estimated to be HIV infected,constituting 278 migrants.There were 72(per 10,000)migrants estimated to have had AIDS,representing a proportion of 1.6611e-08.The result suggests that the disease-free steady state was unstable since the estimated basic reproduction number R0 was 2.0906 and 2.3322 for the models without and with migration,respectively.This is not a good indicator from the public health point of view,as the aim is to stabilize the epidemic at the disease-free equilibrium.The advantage of introduction of migration to the simple model validated the true R0 and the transmission rate b associated with HIV and AIDS epidemic disease in Malaysia.It also indicates an approximately 12 percentage points increase in the rate of HIV infection with migration. 展开更多
关键词 MIGRATION Mathematical transmission modeling HIV/AIDS Parameter estimation Basic reproduction number
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