| 1. |
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| 2. |
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| 3. |
- Hussain, Sajid, et al.
(författare)
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Families of Extended Exponentiated Generalized Distributions and Applications of Medical Data Using Burr III Extended Exponentiated Weibull Distribution
- 2023
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Ingår i: Mathematics. - 2227-7390. ; 11:14
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Tidskriftsartikel (refereegranskat)abstract
- In this article, four new families named as Weibull extended exponentiated-X (WEE-X), Lomax extended exponentiated-X (LEE-X), Logistic extended exponentiated-X (LGCEE-X), and Burr III extended exponentiated-X (BIIIEE-X) with their quantile functions are proposed. The expressions for distribution function and density function of BIIIEE-X family are written in terms of linear combinations of the exponentiated densities based to parent model. New models, i.e., Weibul extended exponentiated Weibull (WEEW), Lomax extended exponentiated Weibull (LEEW), Logistic extended exponentiated Weibull (LGCEEW), and Burr III extended exponentiated-Weibull (BIIIEEW) distributions are derived, were plotted for functions of probability density and hazard rate at different levels of parameters. Some mathematical properties of the BIIIEEW model are disclosed. The maximum likelihood method for the BIIIEEW model are described. Numerical applications of the BIIIEEW model to disease of cancer datasets are provided.
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| 4. |
- Hussain, Sajid, et al.
(författare)
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The Exponentiated Power Alpha Index Generalized Family of Distributions : Properties and Applications
- 2023
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Ingår i: Mathematics. - : MDPI AG. - 2227-7390. ; 11:4, s. 900-900
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Tidskriftsartikel (refereegranskat)abstract
- The study of hydrological characteristics has a vital role in designing, planning, and managing water resources. The selection of appropriate probability distributions and methods of estimations are basic elements in hydrology analyses. In this article, a new family named the ‘exponentiated power alpha index generalized’ (EPAIG)-G is proposed to develop several new distributions. Using this proposed family, we developed a new model, called the EPAIG-exponential (EPAIG-E). A few structural properties of the EPAIG-G were obtained. The EPAIG-E parameters were estimated through the method of maximum likelihood (MML). The study of the Monte Carlo simulation (MCS) was produced for the EPAIG-E. The model performance is illustrated using real data.
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| 5. |
- Hussain, Sajid, et al.
(författare)
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The Generalized Alpha Exponent Power Family of Distributions : Properties and Applications
- 2022
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Ingår i: Mathematics. - : MDPI AG. - 2227-7390. ; 10:9
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Tidskriftsartikel (refereegranskat)abstract
- Here, a new method is recommended to characterize a new continuous distribution class, named the generalized alpha exponent power family of distributions (GAEPFDs). A particular sub-model is presented for exemplifying the objective. The basic statistical properties, such as ordinary moments, the probability weighted moments, mode, quantile, order statistics, entropy measures, and moment generating functions, etc., were explored. To gauge the GAEPPRD parameters, the ML technique was utilized. The estimator behaviour was studied by a Monte Carlo simulation study (MCSS). The effectiveness of GAEPFDs was demonstrated observationally through lifetime data. The applications show that GAEPFDs can offer preferable results over other competitive models.
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| 6. |
- Hussain, Sajid, et al.
(författare)
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The Generalized Exponential Extended Exponentiated Family of Distributions : Theory, Properties, and Applications
- 2022
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Ingår i: Mathematics. - : MDPI AG. - 2227-7390. ; 10:19
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Tidskriftsartikel (refereegranskat)abstract
- Here, we propose a new generalized exponential extended exponentiated (NGE3) family of distributions. Some statistical properties of proposed family are gained. The most extreme probability method, maximum likelihood (ML), is utilized for parameter estimation. We explore an exceptional model called NGE3-Exponential (NGE3E). NGE3E is estimated with ML, and the performance of estimators is demonstrated by utilizing a simulation. Moreover, two applications are given to show the significance and adaptability of the proposed model in comparison to some generalized models (GMs).
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| 7. |
- Noreen, Khadija, et al.
(författare)
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Algorithms to obtain generalized neighbor designs in minimal circular blocks
- 2022
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Ingår i: Communications in statistics. Simulation and computation. - : Taylor & Francis. - 0361-0918 .- 1532-4141.
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Tidskriftsartikel (refereegranskat)abstract
- The experiments where response of a treatment (direct effect) is affected by the treatment(s) applied in neighboring units, neighbor designs are used to balance the neighbor effects. Being the economical, minimal neighbor designs are preferred by the experimenters. Minimal circular neighbor designs could not be constructed for almost every case of v even, where v is number of treatments. For v even, minimal circular generalized neighbor designs are preferred. In this article, algorithms are developed to obtain minimal circular generalized neighbor designs in which (a) v/2 of the unordered pairs, and (b) 3v/2 of the unordered pairs, do not appear as neighbor whereas the remaining ones appear once. These algorithms are also coded with R-language.
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| 8. |
- Sulaiman Rahman, Heshu, et al.
(författare)
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Biochemical and molecular identification with antimicrobial susceptibility of bacterial species isolated from organs and tissues of Alectoris chukar subspecies Kurdistanica
- 2020
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Ingår i: Journal of Zankoy Sulaimani: Part A. - : Journal of Zankoy Sulaimani - Part A. - 1812-4100 .- 2521-4853. ; 22:1
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The current study was conducted on 50 Alectoris chukar subspecies Kurdestanica that was collected from Sulaymaniyah Province, Kurdistan Region, Northern Iraq, during the period of April to the end of September 2016. Samples of liver, gallbladder, spleen, kidneys, heart, lungs, gizzard, breast, and thigh muscle tissues were tested for bacterial isolates. Preliminary characterization of the isolated bacteria was carried out by morphological and biochemical methods. The VITEK 2® system was used to confirm the isolated species, while the polymerase chain reaction (PCR) was used for the detection of the resistance gene in the bacterial isolates. As a result, tested samples showed the presence of Staphylococcus sciuri and Escherichia coli. Additionally, antimicrobial susceptibility test was done to determine the bacterial susceptibility to various antibiotics and as a result; E. coli showed 100% susceptibility to penicillin, azithromycin, tetracycline, and doxycycline and 75% susceptibility to streptomycin. On the other hand, S. sciuri exhibited 75% susceptibility to azithromycin, penicillin, and doxycycline, 50% susceptibility to streptomycin, and 25% susceptibility to tetracycline. Molecular identification showed that only the S. sciuri isolates carried the methicillin-resistant mecA gene. To our knowledge, this is the first record of isolation of the S. sciuri methicillin-resistant mecA gene from A. chukar subspecies Kurdestanica.
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| 9. |
- Bravo, L, et al.
(författare)
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- 2021
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swepub:Mat__t
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| 10. |
- Tabiri, S, et al.
(författare)
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- 2021
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swepub:Mat__t
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| 11. |
- Fardos, Akbar, et al.
(författare)
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Algorithm to generate efficient circular designs robust to neighbor effects
- 2024
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Ingår i: Kuwait Journal of Science. - 2307-4108. ; 51:1
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Tidskriftsartikel (refereegranskat)abstract
- Minimal circular balanced and strongly balanced neighbor designs (MCBNDs & MCSBNDs) are popular to control neighbor effects and to estimate neighbor and direct effects independently. In this article, an R-coded algorithm is presented to obtain efficient MCBNDs and MCSBNDs for odd v (number of treatments), and its four generalized classes for v even. Developed algorithm has made the construction of the efficient circular designs robust to neighbor effects so easy in blocks of equal and unequal sizes.
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| 12. |
- Hassan, Jamshaidul, et al.
(författare)
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Construction of circular quasi rees neighbor designs which can be converted into minimal circular balanced and strongly balanced neighbor designs
- 2023
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Ingår i: Communications in Statistics - Theory and Methods. - : Informa UK Limited. - 0361-0926 .- 1532-415X. ; 52:16, s. 5587-5605
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Tidskriftsartikel (refereegranskat)abstract
- The response of a treatment (direct effect) applied on a given unit may be affected by the treatments applied to its neighboring units (neighbor effects). Neighbor designs are considered robust to neighbor effects. Minimal neighbor designs are economical, therefore, these are preferred by the experimenters. Method of cyclic shifts (Rule I) provides the minimal neighbor designs for odd v (number of treatments). Method of cyclic shifts (Rule II) provides the minimal circular Quasi Rees neighbor designs for v even which are considered to be the good alternate to the minimal neighbor designs. In this article, for every case of v even, minimal circular Quasi Rees neighbor designs are constructed in such a way that these designs can also be converted directly into minimal circular balanced and strongly balanced neighbor designs.
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| 13. |
- Hassan, Mujtaba, et al.
(författare)
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An Assessment of the South Asian Summer Monsoon Variability for Present and Future Climatologies Using a High Resolution Regional Climate Model (RegCM4.3) under the AR5 Scenarios
- 2015
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Ingår i: Atmosphere. - : MDPI AG. - 2073-4433. ; 6:11, s. 1833-1857
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Tidskriftsartikel (refereegranskat)abstract
- We assessed the present and future climatologies of mean summer monsoon over South Asia using a high resolution regional climate model (RegCM4) with a 25 km horizontal resolution. In order to evaluate the performance of the RegCM4 for the reference period (1976-2005) and for the far future (2070-2099), climate change projections under two greenhouse gas representative concentration pathways (RCP4.5 and RCP8.5) were made, the lateral boundary conditions being provided by the geophysical fluid dynamic laboratory global model (GFDL-ESM2M). The regional climate model (RCM) improves the simulation of seasonal mean temperature and precipitation patterns compared to driving global climate model (GCM) during present-day climate conditions. The regional characteristic features of South Asian summer monsoon (SASM), like the low level jet stream and westerly flow over the northern the Arabian Sea, are well captured by the RegCM4. In spite of some discrepancies, the RegCM4 could simulate the Tibetan anticyclone and the direction of the tropical easterly jet reasonably well at 200 hPa. The projected temperature changes in 2070-2099 relative to 1976-2005 for GFDL-ESM2M show increased warming compared to RegCM4. The projected patterns at the end of 21st century shows an increase in precipitation over the Indian Peninsula and the Western Ghats. The possibilities of excessive precipitation include increased southwesterly flow in the wet period and the effect of model bias on climate change. However, the spatial patterns of precipitation are decreased in intensity and magnitude as the monsoon approaches the foothills of the Himalayas. The RegCM4-projected dry conditions over northeastern India are possibly related to the anomalous anticyclonic circulations in both scenarios.
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| 14. |
- Hassan, Mujtaba, et al.
(författare)
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Streamflow response to projected climate changes in the Northwestern Upper Indus Basin based on regional climate model (RegCM4.3) simulation
- 2019
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Ingår i: Journal of Hydro Environment Research. - : Elsevier BV. - 1570-6443. ; 27, s. 32-49
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Tidskriftsartikel (refereegranskat)abstract
- In the present research, we used bias corrected output of regional climate model (RegCM4.3) to generate streamflow for future climate change projections in the Northwestern Upper Indus Basin (NUIB) under RCP4.5 and RCP8.5 scenarios. The average annual runoff was found to be continuously increasing by the end of 21st century. The increase in precipitation as well as the streamflow for summer and winter in the NUIB indicated that RegCM4.3 simulated climate change projections were realistically transferred to HEC-HMS hydrological model. Maximum streamflow peaks, both in frequency and magnitude, were observed in July and August over three streamflow gauges (i.e. Besham, Nowshera and Khairabad) posing possible threats of flood risks during the monsoon season in Pakistan. Significant streamflow changes were projected for winter and spring seasons. The analysis of flow duration curve for three hydrometric stations indicates that the flow occurrence probability could be greater under both scenarios relative to the reference period. The increase in streamflow was projected under high (Q(5)) and medium (Q(50)) flow, which could possibly be related with the increase in monsoon precipitation events in the NUIB. Overall it is to be expected that the NUIB will confront more floods as a result of projected increase in medium and high flow, which demands better policies and management towards the water resources of the NUIB. This study is expected to contribute considerably to climate change impact assessment studies over the NUIB, Pakistan.
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| 15. |
- Jabeen, Rida, et al.
(författare)
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General construction of efficient circular partially strongly-balanced repeated measurements designs
- 2022
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Ingår i: Communications in statistics. Simulation and computation. - : Informa UK Limited. - 0361-0918 .- 1532-4141. ; , s. 1-11
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Tidskriftsartikel (refereegranskat)abstract
- Residual effects in repeated measurements design (RMDs) leads to wrong estimation of direct treatment effects. Minimal strongly balanced RMDs are preferred to balance out the residual effects. The partially strongly balanced designs form an important family of RMDs which provide designs where minimal strongly balanced RMDs do not exist. In this article, a general construction of efficieint circular partially strongly-balanced RMDs is given in periods of k different sizes which produces these designs in periods of equal sizes, two different sizes, three different sizes, …, by putting k = 1, 2, 3, …, respectively.
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| 16. |
- Khan, A., et al.
(författare)
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A comprehensive review of the methane decomposition using a gliding arc discharge reactor for hydrogen generation
- 2023
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Ingår i: Journal of the Energy Institute. - : Elsevier. - 1743-9671 .- 1746-0220. ; 109
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Tidskriftsartikel (refereegranskat)abstract
- The use of fossil fuels has caused an ongoing increase in greenhouse gases (GHGs), which have a negative impact on both the environment and human health. The world requires an alternative green sustainable fuel that can solve these problems. Hydrogen (H2) can be considered as an alternative green energy source as it has zero carbon emissions. Methane (CH4) decomposition is a potential technique to produce H2 fuel. Gliding arc discharge (GAD) reactors have gained significant attention to produce H2 from the decomposition of CH4. This review focuses on the application of GAD reactors for CH4 conversion. The effects of different parameters, such as operation conditions, additives, geometric configuration, and catalysts, on the performance of the GAD reactor, are discussed in this review. © 2023 Energy Institute
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| 17. |
- Khan, Abid, et al.
(författare)
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Construction of minimal circular nearly strongly balanced repeated measurements designs and their conversion
- 2023
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Ingår i: Communications in statistics. Simulation and computation. - : Informa UK Limited. - 0361-0918 .- 1532-4141. ; 52:12, s. 5749-5758
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Tidskriftsartikel (refereegranskat)abstract
- Repeated measurements designs (RMDs) are very useful and economical but unfortunately, with the use of RMDs, a major source of bias is arisen, that is the carry over effect. Minimal designs which are strongly and nearly strongly balanced, are preferred to estimate the direct and carry over effects independently. In this article, some new classes of minimal circular nearly strongly balanced RMDs are constructed in periods of two and three different sizes which can be converted directly into minimal circular balanced and minimal strongly balanced which are highly efficient.
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| 18. |
- Khatri, C, et al.
(författare)
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Outcomes after perioperative SARS-CoV-2 infection in patients with proximal femoral fractures: an international cohort study
- 2021
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Ingår i: BMJ open. - : BMJ. - 2044-6055. ; 11:11, s. e050830-
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Tidskriftsartikel (refereegranskat)abstract
- Studies have demonstrated high rates of mortality in people with proximal femoral fracture and SARS-CoV-2, but there is limited published data on the factors that influence mortality for clinicians to make informed treatment decisions. This study aims to report the 30-day mortality associated with perioperative infection of patients undergoing surgery for proximal femoral fractures and to examine the factors that influence mortality in a multivariate analysis.SettingProspective, international, multicentre, observational cohort study.ParticipantsPatients undergoing any operation for a proximal femoral fracture from 1 February to 30 April 2020 and with perioperative SARS-CoV-2 infection (either 7 days prior or 30-day postoperative).Primary outcome30-day mortality. Multivariate modelling was performed to identify factors associated with 30-day mortality.ResultsThis study reports included 1063 patients from 174 hospitals in 19 countries. Overall 30-day mortality was 29.4% (313/1063). In an adjusted model, 30-day mortality was associated with male gender (OR 2.29, 95% CI 1.68 to 3.13, p<0.001), age >80 years (OR 1.60, 95% CI 1.1 to 2.31, p=0.013), preoperative diagnosis of dementia (OR 1.57, 95% CI 1.15 to 2.16, p=0.005), kidney disease (OR 1.73, 95% CI 1.18 to 2.55, p=0.005) and congestive heart failure (OR 1.62, 95% CI 1.06 to 2.48, p=0.025). Mortality at 30 days was lower in patients with a preoperative diagnosis of SARS-CoV-2 (OR 0.6, 95% CI 0.6 (0.42 to 0.85), p=0.004). There was no difference in mortality in patients with an increase to delay in surgery (p=0.220) or type of anaesthetic given (p=0.787).ConclusionsPatients undergoing surgery for a proximal femoral fracture with a perioperative infection of SARS-CoV-2 have a high rate of mortality. This study would support the need for providing these patients with individualised medical and anaesthetic care, including medical optimisation before theatre. Careful preoperative counselling is needed for those with a proximal femoral fracture and SARS-CoV-2, especially those in the highest risk groups.Trial registration numberNCT04323644
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| 19. |
- Mahmood, Muhammad Ahmed, et al.
(författare)
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Correlation between Serum Tryptase Level and Disease Severity in Asthmatic Patients in the Sulaimani Governorate
- 2016
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Ingår i: INTERNATIONAL JOURNAL OF MEDICAL RESEARCH & HEALTH SCIENCES. - 2319-5886. ; 5:6, s. 34-41
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Tidskriftsartikel (refereegranskat)abstract
- Asthma is a chronic inflammatory disorder of the lower airways, characterized clinically by reversible airway obstruction and bronchial hyper-responsiveness (BHR). Tryptase is a neutral serine protease and is the most abundant mediator stored in mast cell granules. The release of tryptase from the secretory granules is a characteristic feature of mast cell degranulation in allergic diseases. This study aims to evaluate the difference between serum tryptase levels and asthma severity in the Sulaimani governorate. Five milliliters of venous blood were obtained from 85 healthy control and 85 asthmatic patients were subdivided into three groups; controlled asthma (n = 25), partly controlled asthma (n = 30) and uncontrolled asthma (n = 30). Serum tryptase level was analyzed by using sandwich ELISA. There was a significant difference among the study groups, with highest serum tryptase levels in the uncontrolled asthma group (7.68 +/- 0.65 ng/dl) and lowest levels in the controlled asthma group (4.4 +/- 0.15 ng/dl). Serum tryptase levels increase significantly with age. There was a significant difference between ex-smokers and never-smokers among asthmatic subjects. No significance in serum tryptase levels was found between males and females and between asthmatic subjects with negative and positive family history of asthma. Serum tryptase levels in uncontrolled asthma were significantly higher than in controlled asthma. Serum tryptase levels are elevated with age and also in ex-smoker asthmatic subjects. However, there was no significant difference in the levels of serum tryptase according to gender and family history of asthma.
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| 20. |
- Mahmood, Rashid, et al.
(författare)
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Assessment of antidiabetic potential and phytochemical profiling of Rhazya stricta root extracts
- 2020
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Ingår i: BMC Complementary Medicine and Therapies. - : Springer Nature. - 2662-7671. ; 20:1
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Tidskriftsartikel (refereegranskat)abstract
- Background: Diabetes mellitus is a chronic disease characterized by hyperglycemia that may occur due to genetic, environmental or lifestyle factors. Natural remedies have been used to treat diabetes since long and many antidiabetic compounds of varied efficacies have been isolated from medicinal plants. Rhazya stricta has been used for decades for the treatment of diabetes mellitus and associated ailments. Considering the folkloric use of R. stricta against diabetes, it was aimed to investigate the effectiveness of its root extracts against diabetes through in vitro assays and in vivo studies using animal model along with phytochemical profiling through GCMS. Methods: Various fractions of Rhazya stricta obtained through column chromatography were evaluated for a variety of assays including a-glucosidase, Dipeptidyl peptidase-IV (DPP-IV), beta-secretase and Glucagon-like peptide-1 (GLP-1) secretion studies. For the in vivo studies the alloxan-induced diabetic mice were treated with root extracts and blood glucose levels, HbA1C, and other biochemical markers along with the histological study of the liver were done. The phytochemical identification was performed using an Agilent 7890B GC coupled to a 7010 Triple Quadrupole (MS/MS) system. GraphPad Prism software version 5.01 was used for statistical analysis. Results: Majority of the extract fractions showed excellent results against diabetes by inhibiting enzymes DPP-IV (Up to 61%) and beta-secretase (Up to 83%) with IC50s 979 pg/ml and 169 mu g/ml respectively with increase in the GLP1 secretion. The results of in vivo studies indicated a marked reduction in blood glucose and HbA1c levels along with positive effects on other parameters like lipid profile, liver functions and renal functions of extract-treated mice as compared to control. The histological examination of the liver demonstrated hepatoprotective effects against diabetes led changes and various classes of phytochemicals were also identified through GCMS in different fractions. Conclusion: The results revealed strong antidiabetic activity of R. stricta root with the potential to protect body organs against diabetic changes. Moreover, a variety of phytochemicals has also been identified through GCMS that might be responsible for the antidiabetic potential of Rhazya stricta root.
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| 21. |
- Nadeem, Muhammad, et al.
(författare)
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New generators for minimal circular generalised neighbour designs in blocks of two different sizes
- 2023
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Ingår i: Statistics in Transition New Series. - 1234-7655 .- 2450-0291. ; 24:2, s. 85-92
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Tidskriftsartikel (refereegranskat)abstract
- Minimal neighbour designs (NDs) are used when a response of a treatment (direct effect) is affected by the treatment(s) applied in the neighbouring units. Minimal generalised NDs are preferred when minimal NDs cannot be constructed. Through the method of cyclic shifts (Rule I), the conditions for the existence of minimal circular generalised NDs are discussed, in which v/2 unordered pairs do not appear as neighbours. Certain generators are also developed to obtain minimal circular generalised NDs in blocks of two different sizes, where k2 = 3, 4 and 5. All these designs are constructed using i sets of shifts for k1 and two for k2.
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| 22. |
- Noreen, Khadija, et al.
(författare)
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Some important classes of non-directional minimal circular weakly balanced neighbor designs
- 2023
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Ingår i: Communications in statistics. Simulation and computation. - 0361-0918 .- 1532-4141. ; , s. 1-10
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Tidskriftsartikel (refereegranskat)abstract
- Minimal neighbor designs are useful to balance out neighbor effects economically. The method of cyclic shifts provides the construction of these minimal designs in circular blocks only for v odd, where v is the number of treatments to be compared. Minimal circular weakly balanced neighbor designs are used for v even. In this article, two classes of minimal circular weakly balanced neighbor designs are constructed for v even. In class I, v/2 of all unordered pairs of two distinct treatments appear twice as neighbors while the remaining ones appear once. In class II, 3v/2 of all unordered pairs appear twice as neighbors.
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| 23. |
- Rasheed, H. M. Kashif, et al.
(författare)
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Efficient circular repeated measurements designs strongly balanced to control carryover effects
- 2024
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Ingår i: Communications in statistics. Simulation and computation. - 0361-0918 .- 1532-4141.
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Tidskriftsartikel (refereegranskat)abstract
- In experiments related to agriculture, psychology, medicine, animal sciences, pharmacology, and other fields, repeated measurements designs (RMDs) are utilized which are economical design. However, the use of these designs may result in carryover effects, which are the primary cause of bias. Balanced or strongly balanced RMDs can control these effects. Strongly balanced RMDs estimate the direct effects and carryover effects independently; therefore, these designs have an edge over the balanced RMDs. In this article, therefore, some general procedures are presented to obtain minimal circular strongly and nearly strongly balanced RMDs in periods of k different sizes with high efficiency of Separability and of carryover effects.
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| 24. |
- Riaz, Muhammad, et al.
(författare)
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Construction of efficient classes of circular balanced repeated measurements designs with R
- 2024
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Ingår i: Communications in Statistics - Theory and Methods. - 0361-0926 .- 1532-415X.
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Tidskriftsartikel (refereegranskat)abstract
- Pharmacology, medicine, psychology, and the animal sciences all employ repeated measurement designs (RMDs). However, RMDs may experience carryover effects, which are the primary cause of bias in treatment effect estimation. In order to eliminate the carryover effects for odd v (the number of treatments), minimal circular balanced and strongly balanced repeated measurement designs (RMDs) are the ones that should be used. The minimal circular partially balanced and weakly balanced RMDs are used for even v. In order to obtain these important classes of minimal circular RMDs in periods of equal, two, and three different sizes, an R-based algorithm is developed in this article. The newly developed algorithm has made so simple the construction of balanced RMDs and their generalized classes. As a result, it is a novel piece of research.
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| 25. |
- ul Hassan, Mahmood, et al.
(författare)
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Efficient Minimal Circular Strongly Partially Balanced RMDs in Periods of Two Different Sizes
- 2022
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Ingår i: Thailand statistician. - 1685-9057 .- 2351-0676. ; 20:1, s. 80-97
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Tidskriftsartikel (refereegranskat)abstract
- Balanced or strongly balanced repeated measurements designs (RMDs) are used to balance out residual effects Minimal strongly balanced RMD (SBRMDs) are important to estimate the direct effects and residual effects independently at low cost but there are many situations where SBRMDs cannot be constructed. In such situations, strongly partially balanced RMDs (SPBRMDs) are preferred. In literature, these designs are not available for odd p(1) (larger period size). In this paper, minimal circular SPBRMDs are constructed in periods of two different sizes for almost every case of p(1) (odd).
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| 26. |
- Ul Hassan, Mahmood, et al.
(författare)
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Regional frequency analysis of annual daily rainfall maxima in Skåne, Sweden
- 2021
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Ingår i: International Journal of Climatology. - : Wiley. - 0899-8418 .- 1097-0088. ; 41:8, s. 4307-4320
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Tidskriftsartikel (refereegranskat)abstract
- Extreme daily rainfall events are critical for the urban drainage system, human life, agriculture and small catchments. The information about extreme rainfall magnitudes and frequencies is immensely important for civil engineers, city planners, scientists related to water management, rescue operations and flood control works. This study illustrates the results of regional frequency analysis of annual maximum daily rainfall (AMDR) of Skåne County, Sweden. L‐moments based heterogeneity measure (H) reveals that the Skåne County is a homogeneous region. Based on the L‐moment ratio diagram and ZDist statistic results, the generalized normal (GNO) distribution is selected as the most suitable regional distribution. The accuracy measures used in K‐fold cross validation indicate that support vector machine (SVM) model is an appropriate model to find the index rainfall at ungauged sites in the region. The sites characteristics, elevation and latitude are identified as the most important variables to explain the variation in mean annual maximum daily rainfall (MAMDR). Finally, spatial maps of predicted MAMDR for different return periods are constructed by using index rainfall combined with regional quantiles. Spatial maps offer an overall view of the expected MAMDR in the region that is helpful for multiple decision makers including infrastructure planners, city planners, emergency managers, engineers and many others.
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| 27. |
- Yameen, Muhammad Zubair, et al.
(författare)
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Biodiesel production from marine macroalgae Ulva lactuca lipids using novel Cu-BTC@AC catalyst : Parametric analysis and optimization
- 2024
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Ingår i: Energy Conversion and Management. - : Elsevier. - 2590-1745. ; 23
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Tidskriftsartikel (refereegranskat)abstract
- The pursuit of renewable fuels for the transportation sector, particularly for combustion engines like diesel, is crucial in reducing greenhouse gas emissions. This study introduces an innovative strategy for biodiesel production utilizing marine macroalgae Ulva lactuca as the primary feedstock, emphasizing sustainability and resource efficiency. Lipids were extracted from the macroalgae via a Soxhlet process and characterized using GC–MS and FTIR to ascertain fatty acid composition and functional groups. The Cu–BTC@AC catalyst, synthesized from the lipid-extracted algae residue via pyrolysis and hydrothermal treatment, underwent characterization using SEM–EDS, XRD, and FTIR techniques. Subsequently, the Cu–BTC@AC catalyst was employed in the transesterification process to efficiently convert the extracted algal lipids into biodiesel, achieving a high yield of 92.56 % under RSM-optimized conditions: 65 °C temperature, 3.96 wt% catalyst amount, 15:1 methanol-to-lipid ratio, and 140 min reaction time. Kinetic and thermodynamic parameters for biodiesel production were calculated as follows: Ea = 33.20 kJ mol−1, ΔH# = 30.39 kJ mol−1, ΔS# = –165.86 J mol−1 K−1, and ΔG# = 86.48 kJ mol−1. GC–MS analysis identified a significant FAME content in the biodiesel, comprising 98.12 % of its composition. Notably, the Cu–BTC@AC catalyst exhibited excellent reusability, maintaining 80.21 % biodiesel yield after the third cycle. Moreover, physicochemical analysis of the biodiesel confirmed its compliance with ASTM D6751 specifications, underscoring its potential as a viable alternative fuel for the transportation sector.
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| 28. |
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| 29. |
- Abbafati, Cristiana, et al.
(författare)
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- 2020
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Tidskriftsartikel (refereegranskat)
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