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Effects of temporal variability on HBV model calibration

Water Science and Engineering 2015年第4期8卷 291-300页

作者： Steven Reinaldo Rusli doddi yudianto Jin-tao Liu Civil Engineering Department Faculty of Engineering Parahyangan Catholic University State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University

This study aimed to investigate the effects of temporal variability on the optimization of the Hydrologiska *** Vattenbalansavedlning （HBV） model, as well as the calibration performance using manual optimization and average parameter values. By applying the HBV model to the Jiangwan Catchment, whose geological features include lots of cracks and gaps, simulations under various schemes were developed： short, medium-length, and long temporal calibrations. The results show that, with long temporal calibration, the objective function values of the Nash- Sutcliffe efficiency coefficient （NSE）, relative error （RE）, root mean square error （RMSE）, and high flow ratio generally deliver a preferable simulation. Although NSE and RMSE are relatively stable with different temporal scales, significant improvements to RE and the high flow ratio are seen with longer temporal calibration. It is also noted that use of average parameter values does not lead to better simulation results compared with manual optimization. With medium-length temporal calibration, manual optimization delivers the best simulation results, with NSE, RE, RMSE, and the high flow ratio being 0.563 6, 0.122 3, 0.978 8, and 0.854 7, respectively; and calibration using average parameter values delivers NSE, RE, RMSE, and the high flow ratio of 0.481 1, 0.467 6, 1.021 0, and 2.784 0, respectively. Similar behavior is found with long temporal calibration, when NSE, RE, RMSE, and the high flow ratio using manual optimization are 0.525 3, -0.069 2, 1.058 0, and 0.980 0, respectively, as compared with 0.490 3, 0.224 8, 1.096 2, and 0.547 9, respectively, using average parameter values. This study shows that selection of longer periods of temooral calibration in hvdrolouical analysis delivers better simulation in general for water balance analysis.

关键词： HBV model Model calibration Jiangwan Catchment Temporal variability

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Extended activated sludge model no. 1 (ASM1) for simulating biodegradation process using bacterial technology

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Water Science and Engineering 2012年第3期5卷 278-290页

作者： Ya-jing SONG Yue-bo XIE doddi yudianto College of Hydrology and Water Resources Hohai University Nanjing 210098 P. R. China Civil Engineering Department Parahyangan Catholic University West Java 112548 Indonesia

Phosphorus is one of the most important nutrients required to support various kinds of biodegradation processes. As this particular nutrient is not included in the activated sludge model no. 1 （ASM1）, this study extended this model in order to determine the fate of phosphorus during the biodegradation processes. When some of the kinetics parameters are modified using observed data from the restoration project of the Xuxi River in Wuxi City, China, from August 25 to 31 in 2009, the extended model shows excellent results. In order to obtain optimum values of coefficients of nitrogen and phosphorus, the mass fraction method was used to ensure that the final results were reasonable and practically relevant. The temporal distribution of the data calculated with the extended ASM1 approximates that of the observed data.

关键词： stream restoration," bacterial technology," extended activated sludge model no. 1(ASM1) mass fraction," Xuxi River

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Influences of Limited Ammonium Nitrogen and Water Temperature on the Urban Stream Restoration Using Bacterial Technology – View from the Perspective of Numerical Modelling

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Journal of Water Resource and Protection 2010年第3期2卷 227-234页

作者： doddi yudianto Yuebo Xie 不详

To complete the previously information issued on the feasibility study and some technical challenges identi-fied from the application of bacterial technology, this study presents another characteristics of numerical output as the bacterial growth is now also limited to ammonium nitrogen and water temperature. Based on the results obtained, it is found that the degradation of readily biodegradable COD will be much slower be-cause of lower bacterial growth. At certain period, the COD concentration will increase and be plotted higher later on compared to the model which is limited only to substrate and oxygen. Besides the ammonium nitro-gen, other parameters i.e. particulate products from COD decay and particulate degradable organic nitrogen will also increase soon after certain time. Considering the increase of ammonium nitrogen as it is also con-verted to nitrate nitrogen, it can be predicted that some algae may show up during the treatment processes. When the model is simulated under different water temperature, slower biodegradation process is presented at lower water temperature. Because the bacteria grow better at higher water temperature, more oxygen is then required. Finally, from this study, it is also identified that the artificial mixing and addition of oxygen at initial stage of treatment will considerably influence the restoration.

关键词： Stream Restoration Bacterial Technology Polluted Urban Streams Numerical Modelling MATLAB

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Unusual case of a free anterolateral thigh flap partial necrosis in a COVID-19 positive young male following extremity reconstruction

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Chinese Journal of Traumatology 2023年第5期26卷 308-310页

作者： Sourabh Shankar Chakraborty Anjana Malhotra Urvi Ashok Shah Shylesh Ramesh Babu Puja Bhaurao Dandekar doddi Avinash Kumar Chindarkar Himanshu Prakash Department of Burn&Plastic Surgery All India Institute of Medical SciencesKalyaniWest Bengal741245India Department of Plastic Surgery South Eastern Railway Central HospitalKolkataWest Bengal700043India

Free flap procedure provides an overall success rate of 97%, which decreases to 85% in hypercoagulable states. COVID-19, as a pro-thrombotic disorder, therefore seems detrimental to free flap survival. We encountered a case of unique pattern of free flap partial failure in a young male who underwent extremity reconstruction. The patient was diagnosed as COVID-19 positive on the 3rd day post-reconstruction. The flap survived well for the first 7 days post-operatively, but gradually the skin got necrosed and the subcutaneous fat layer was preserved when debriding. To our knowledge, this is the only case in which the skin of the free flap of a COVID-19 positive patient was necrosed almost entirely subsequently, while the subcutaneous fat was relatively preserved.

关键词： COVID-19 Free anterolateral thigh flap Partial flap failure Freeflapcomplication

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Trichomonas vaginalis and Chlamydia trachomatis Prevalence,Incidence and Associated Factors in Pregnant Adolescents from Belém City,in the Brazilian Amazon

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Open Journal of Obstetrics and Gynecology 2015年第12期5卷 677-687页

作者： Camila Marconi Marli Teresinha Cassamassimo Duarte Márcia Guimaraes da Silva Larissa doddi Marcolino Jossimara Polettini Ana Paula Goncalves Adriano Dias Marilza Vieira Cunha Rudge Basic Pathology Department UFPR—Universidade Federal do Paraná Parana Brazil UNOESTE The University of Western Sao Paulo Sao Paulo Brazil Department of Pathology Botucatu Medical School UNESP—Universidade Estadual Paulista Sao Paulo Brazil Department of Nursing Botucatu Medical School UNESP—Universidade Estadual Paulista Sao Paulo Brazil Department of Nursing Institute of Health Sciences UFPA—Universidade Federal do Pará Belém Brazil Department of Public Health Botucatu Medical School UNESP—Universidade Estadual Paulista Sao Paulo Brazil Department of Gynecology and Obstetrics Botucatu Medical School UNESP—Universidade Estadual Paulista Sao Paulo Brazil

Background: Adolescents are disproportionally affected by sexually transmitted infections (STI). Chlamydia trachomatis (CT) and Trichomonas vaginalis (TV) are the most frequent curable STI in adolescents, causing serious consequences for their reproductive health. Therefore, we aimed to determine the prevalence and incidence of CT and TV, as well as their risk factors in pregnant adolescents from Belém, northern Brazilian Amazon. Methods: This prospective study enrolled 199 adolescents up to 20 weeks of pregnancy. They were scheduled for follow-up visit between 28 and 29 weeks of pregnancy. Sociodemographic and behavioral data were obtained by interview. Cervicovaginal samples were taken to test for TV, CT, Neisseria gonorrhoeae and bacterial vaginosis. Univariate and multivariate analyses were performed to test the association of prevalent/incident CT and TV with the variables. Results: Prevalence of cervical CT infection was 33.7% (n = 67/ 199), and for trichomoniasis it was 4.0% (n = 8/199). Cervical ectopy increased the risk for prevalent CT (OR, 1.93;95% CI, 1.01 - 3.70), while having treated vaginal discharge in the past (OR, 0.51;95% CI, 0.26 - 0.98) and being married (OR, 0.10;95% CI, 0.01 - 0.83) were protective against current CT and TV, respectively. Among the 95 (47.7%) adolescents who completed follow-up, 15 cases of incident CT were identified. Incident CT was associated with having a formal or informal job (OR, 28.4;95% CI, 2.1 - 391.6) and bacterial vaginosis treatment at the baseline (OR, 0.08;95% CI, 0.01 - 0.69). Conclusion: Prevalence and incidence rates of TV and CT are high in this population devoid of STI routine screening. Treatment of bacterial vaginosis may benefit this population by reducing risk for CT acquisition.

关键词： Adolescence Pregnancy Sexually Transmitted Infection Chlamydia trachomatis Trichomonas vaginalis

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A Holistic Approach to Enhance FRCS General Surgery Examination Training Using Adult Learning Model: A Non-Profit Initiative

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Surgical Science 2023年第8期14卷 565-574页

作者： Rahul Winayak Sanjay V. Joshi Goran Ahmed Anne O’Neill Ishy Gurung Muhammad Nadeem Muhammed Alwahid Sudeendra doddi Manas Kumar Dube Ahmad Mirza Rishabha D. Sharma Bristol Medical School University of Bristol Bristol UK Medway Maritime Hospital Gillingham Kent UK Frimley Park Hospital Portsmouth Road Camberley UK University Hospitals Plymouth NHS Trust Plymouth UK Northern Devon Healthcare NHS Trust Barnstaple UK Yeovil District Hospital NHS Foundation Trust Yeovil UK Inverclyde Royal Hospital Greenock Scotland UK Princes Royal University Hospital Orpington UK Sherwood Forest Hospitals NHS Foundation Trust Mansfield UK Augusta University Medical Center Augusta GA USA

Objectives: To evaluate the impact of adult learning and simulation-based learning (SBL) on surgical trainees’ learning experiences and Fellowship of the Royal College of Surgeons (FRCS) Section 2 General Surgery examination pass rate. Methods: This was a cross-sequential study involving 148 surgical candidates (72 UK trainees, 75 non-UK trainees) who had attended our revision course (Phoenix FRCS Course) from June 2017 until 2023. Each course comprised a two-day weekend preparation with dedicated sections for clinical, viva, and academic reading, incorporating SBL as its key learning style. We maintained a prospective database of candidate and course details, examination results, and feedback since the course inception. Results: We found that 97% of candidates passed the FRCS examination after their first attempt. The course was attended once by 89% of candidates, and only 3 of the 148 candidates exhausted all four attempts at the examination. Candidate feedback for the course and its style of learning was positive, with simulation-based table viva sessions and virtual clinical sessions proving the most popular learning sessions (95% and 80% of candidates attending courses run in December 2017, April 2018, and May 2021 rated them “Excellent” respectively). Conclusions: The course is centered around shared adult learning and mindfulness tools to encourage candidates to learn from each other and develop confidence and mastery in all domains of surgical practice. These methods have been shown to be effective in achieving high success rates in the Intercollegiate and International FRCS examinations for UK and overseas surgeons.

关键词： Simulation-Based Learning (SBL) Adult Learning Mindfulness Tools FRCS Examination Interleaving

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