ORCID Profile
0000-0002-5980-3460
Current Organisations
University of Aberdeen
,
Keele University
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Publisher: Elsevier BV
Date: 05-2020
Publisher: ACTAPRESS
Date: 2016
Publisher: MDPI AG
Date: 29-06-2021
DOI: 10.3390/MATH9131526
Abstract: Friction-induced stick-slip vibrations are one of the major causes for down-hole drill-string failures. Consequently, several nonlinear models and control approaches have been proposed to solve this problem. This work proposes a dual-loop control strategy. The inner loop d s the vibration of the system, eliminating the limit cycle due to nonlinear friction. The outer loop achieves the desired velocity with a fast time response. The optimal tuning of the control parameters is carried out with a multi-method ensemble meta-heuristic, the Coral Reefs Optimisation algorithm with Substrate Layer (CRO-SL). It is an evolutionary-type algorithm that combines different search strategies within a single population, obtaining a robust, high-performance algorithm to tackle hard optimisation problems. An application ex le based on a real nonlinear dynamics model of a drill-string illustrates that the controller optimised by the CRO-SL achieves excellent performance in terms of stick-slip vibrations cancellation, fast time response, robustness to system parameter uncertainties and chattering phenomenon prevention.
Publisher: Elsevier BV
Date: 08-2021
Publisher: Springer Science and Business Media LLC
Date: 10-11-2020
DOI: 10.1007/S11012-020-01264-5
Abstract: Despite a significant research effort to understand and mitigate stick-slip in drill-strings, this problem yet to be solved. In this work, a comprehensive parametric robustness analysis of the sliding mode controller has hitherto been performed. First, a model verification and extensive parametric analysis of the open-loop model is presented. This is followed by a detailed parametric analysis of the sliding-mode controller based closed-loop system for two cases, (i) an ideal actuator with no delay or constraint and (ii) a realistic actuator with delay or/and constraint. It is shown that though the proposed controller works robustly across a wide range of parameters, in the absence of delay, it fails in the presence of a delay, thereby limiting its practical application. Experimental results are included to support these claims. This work underlines the importance of including the inherent system characteristics during the control design process. Furthermore, the parametric analysis presented here is aimed to act as a blue-print for testing the efficacy of relevant control schemes to be proposed in the future.
Publisher: Elsevier BV
Date: 04-2020
DOI: 10.1016/J.MEEGID.2020.104170
Abstract: Group A rotavirus (RVA) is recognized as a major cause of severe gastroenteritis in newborn calves and goat kids. We estimated the proportion of ruminants infected with rotavirus and identified the circulating genotypes in cattle and goats in Bangladesh. Between May 2009 and August 2010, fecal s les were collected from 520 cattle and goats presenting with diarrhea at three government veterinary hospitals in three districts of Bangladesh. All s les were screened for RVA RNA using real-time, one-step, reverse transcription polymerase chain reaction (qRT-PCR). Of the 520 animals tested, 11.7% (61) were positive for RVA RNA, with 6.2% (15/241) and 16.5% (46/279) positivity in cattle and goats, respectively. RVA positive s les were further characterized by nucleotide sequence analysis of two structural protein gene fragments, VP7 (G genotype), and VP4 (P genotype). Among 17 successfully sequenced strains, G8 (17.9%) was the most prevalent G-genotype followed by G10 (8%) and G6 (1.6%). P[1] (11.3%) was the most frequently detected P-genotype followed by P[11] (3.2%) and P[15] (1.6%). The most common VP7/VP4 combinations for cattle were G10P[11], G10P[15], and G6P[11], and for goat, G8P[1], and G10P[1]. Phylogenetic analysis of the RVA strains showed clustering with bovine and caprine strains from neighboring India. The study adds to our understanding of the genetic ersity of bovine and caprine rotavirus strains in Bangladesh. Our findings highlight the importance of rotavirus surveillance in cattle and goat populations, which may serve as a potential source for genetic reassortment and zoonotic transmission.
Publisher: Oxford University Press (OUP)
Date: 15-09-2017
Abstract: In March 2011, a multidisciplinary team investigated 2 human cases of highly pathogenic avian influenza A(H5N1) virus infection, detected through population-based active surveillance for influenza in Bangladesh, to assess transmission and contain further spread. We collected clinical and exposure history of the case patients and monitored persons coming within 1 m of a case patient during their infectious period. Nasopharyngeal wash specimens from case patients and contacts were tested with real-time reverse-transcription polymerase chain reaction, and virus culture and isolates were characterized. Serum s les were tested with microneutralization and hemagglutination inhibition assays. We tested poultry, wild bird, and environmental s les from case patient households and surrounding areas for influenza viruses. Two previously healthy case patients, aged 13 and 31 months, had influenzalike illness and fully recovered. They had contact with poultry 7 and 10 days before illness onset, respectively. None of their 57 contacts were subsequently ill. Clade 2.2.2.1 highly pathogenic avian influenza H5N1 viruses were isolated from the case patients and from chicken fecal s les collected at the live bird markets near the patients' dwellings. Identification of H5N1 cases through population-based surveillance suggests possible additional undetected cases throughout Bangladesh and highlights the importance of surveillance for mild respiratory illness among populations frequently exposed to infected poultry.
Publisher: Elsevier BV
Date: 2022
Publisher: Informa UK Limited
Date: 2013
Publisher: Wiley
Date: 16-06-2023
DOI: 10.1002/VMS3.1178
Abstract: Tuberculosis (TB) has been an important public health concern in Bangladesh. The most common cause of human TB is Mycobacterium tuberculosis , while bovine TB is caused by Mycobacterium bovis . The objective of this study was to determine the frequency of TB in in iduals with occupational exposure to cattle and to detect Mycobacterium bovis among cattle in slaughterhouses in Bangladesh. Between August 2014 and September 2015, an observational study was conducted in two government chest disease hospitals, one cattle market, and two slaughterhouses. [Correction added on 27 June 2023, after first online publication: In the preceding sentence, the year “2014” has been added after the word “August”.] Sputum s les were collected from in iduals who met the criteria for suspected TB and had been exposed to cattle. Tissue s les were collected from cattle that had low body condition score(s). Both humans and cattle s les were screened for acid‐fast bacilli (AFB) by Ziehl–Neelsen (Z‐N) staining and cultured for Mycobacterium tuberculosis complex (MTC). Region of difference (RD) 9‐based polymerase chain reaction (PCR) was also performed to identify Mycobacterium spp . We also conducted Spoligotyping to identify the specific strain of Mycobacterium spp . Sputum was collected from a total of 412 humans. The median age of human participants was 35 (IQR: 25–50) years. Twenty‐five (6%) human sputum specimens were positive for AFB, and 44 (11%) were positive for MTC by subsequent culture. All ( N = 44) culture‐positive isolates were confirmed as Mycobacterium tuberculosis by RD9 PCR. Besides, 10% of cattle workers were infected with Mycobacterium tuberculosis in the cattle market. Of all TB (caused by Mycobacterium tuberculosis) infected in iduals, 6.8% of in iduals were resistant to one or two anti‐TB drugs. The majority of the s led cattle (67%) were indigenous breeds. No Mycobacterium bovis was detected in cattle. We did not detect any TB cases caused by Mycobacterium bovis in humans during the study. However, we detected TB cases caused by Mycobacterium tuberculosis in all humans, including cattle market workers.
Publisher: Elsevier BV
Date: 08-2022
Publisher: Wiley
Date: 08-03-2018
DOI: 10.1002/VMS3.98
Publisher: Research Square Platform LLC
Date: 14-08-2023
DOI: 10.21203/RS.3.RS-3201454/V2
Abstract: Background: Bangladesh is making progress toward achieving zero human dog-mediated rabies deaths by 2030, a global goal set in 2015. Methods: Drawing from multiple datasets, including patient immunization record books and mass dog vaccination (MDV) databases, we conducted a comprehensive analysis between the years 2011 to 2023 to understand the effectiveness of rabies control programmes and predict human rabies cases in Bangladesh by 2030 using time-series forecasting models. We also compared rabies virus sequences in Bangladesh and other South Asian countries from GenBank. Findings: The human-to-dog ratio in Bangladesh was 85.83 (95% CI 74.63, 97.03), with an average dog population density of 11.51 dogs/km2 (95% CI 10.09, 12.92). The mass dog vaccination (MDV) c aign has resulted in the vaccination of 81.46% (95% CI: 80.54-82.37) of the estimated 3,030,662 dogs in the country. A decreasing trend from predicted and observed human rabies cases was identified, and it is projected that Bangladesh will have zero human rabies cases by 2030 if the current trend persists. The phylogenetic analysis shows that rabies viruses in Bangladesh belong to the Arctic-like-1 group, which differs from those in Bhutan despite sharing a common ancestor. Interpretation: Bangladesh's One Health approach demonstrated that an increase in MDV and ARV resulted in a decline in the relative risk of human rabies cases, indicating that eliminating dog-mediated human rabies could be achievable.
Publisher: Elsevier BV
Date: 12-2021
Publisher: Hindawi Limited
Date: 28-11-2020
DOI: 10.1111/TBED.13921
Publisher: Wiley
Date: 11-03-2016
DOI: 10.1002/VMS3.30
Publisher: Elsevier BV
Date: 09-2022
Publisher: Elsevier BV
Date: 2021
Publisher: Springer International Publishing
Date: 07-10-2022
Publisher: Springer Science and Business Media LLC
Date: 12-02-2020
DOI: 10.1038/S41598-020-59109-W
Abstract: Vaccinating dogs against rabies is an effective means of reducing human rabies. We subjected 1327 clinically diagnosed human rabies death and mass dog vaccination (MDV) data during 2006–2018 to quantify the impacts of MDV on human rabies incidence in Bangladesh and a subset of rabies death data (422) for clinico-epidemiological analysis. A positive and increasing trend of MDV (p = 0.01 and tau = 0.71) and a negative and declining trend (p 0.001 and tau = −0.88) of human rabies cases (Correlation coefficient: −0.82) have been observed. Among 422 deaths, the majority (78%) of the victims sought treatment from traditional healers, and 12% received post-exposure prophylaxis (PEP). The mean incubation period of rabies in cases with exposure sites on the head & neck (35 days) was shorter than the upper limb (mean = 64 days, p = 0.02) and lower limb (mean = 89 days, p 0.01). MDV has been found to be effective for reducing human rabies cases in Bangladesh. Creating awareness among the animal bite victims to stop reliance on traditional healers rather seeking PEP, addressing the role of traditional healers through awareness education programme with respect to the treatment of dog bites, ensuring availability of PEP, and continuing to scale up MDV may help to prevent human rabies deaths.
Publisher: Wiley
Date: 02-07-2017
DOI: 10.1111/ZPH.12372
Abstract: Hepatitis E virus (HEV) is the most common cause of viral hepatitis in humans. Pigs may act as a reservoir of HEV, and pig handlers were frequently identified with a higher prevalence of antibodies to HEV. The objectives of this study were to identify evidence of HEV infection in pigs and compare the history of jaundice between pig handlers and people not exposed to pigs and pork. Blood and faecal s les were collected from 100 pigs derived from three slaughterhouses in the Gazipur district of Bangladesh from January to June, 2011. We also interviewed 200 pig handlers and 250 non-exposed people who did not eat pork or handled pigs in the past 2 years. We tested the pig sera for HEV-specific antibodies using a competitive ELISA and pig faecal s les for HEV RNA using real-time RT-PCR. Of 100 pig sera, 82% (n = 82) had detectable antibody against HEV. Of the 200 pig handlers, 28% (56/200) demonstrated jaundice within the past 2 years, whereas only 17% (43/250) of controls had a history of jaundice (p < .05). Compared to non-exposed people, those who slaughtered pigs (31% versus 15%, p < .001), reared pigs (37% versus 20%, p < .001), butchered pigs (35% versus 19%, p < .001) or involved in pork transportation (28% versus 13%, p < .001) were more likely to be affected with jaundice in the preceding 2 years. In multivariate logistic regression analysis, exposure to pigs (odds ratio [OR]: 2.2, 95% CI: 1.2-3.9) and age (OR: 0.97, 95% CI: 0.95-0.99) was significantly associated with jaundice in the past 2 years. Pigs in Bangladesh demonstrated evidence of HEV infection, and a history of jaundice was significantly more frequent in pig handlers. Identifying and genotyping HEV in pigs and pig handlers may provide further evidence of the pig's role in zoonotic HEV transmission in Bangladesh.
Publisher: Springer International Publishing
Date: 07-10-2022
Publisher: IEEE
Date: 26-11-2022
Publisher: American Society of Tropical Medicine and Hygiene
Date: 04-2012
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
Location: Denmark
Location: United Kingdom of Great Britain and Northern Ireland
Location: Bangladesh
No related grants have been discovered for Najmul Haider.