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Sökning: WFRF:(Zahra ) > Lunds universitet

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1.
  • Arya Azar, Naser, et al. (författare)
  • A hybrid approach based on simulation, optimization, and estimation of conjunctive use of surface water and groundwater resources
  • 2022
  • Ingår i: Environmental Science and Pollution Research. - : Springer Science and Business Media LLC. - 0944-1344 .- 1614-7499. ; 29:37, s. 56828-56844
  • Tidskriftsartikel (refereegranskat)abstract
    • Due to limited groundwater resources in arid and semi-arid areas, conjunctive use of surface water and groundwater is becoming increasingly important. In view of this, there are needs to improve the methods for conjunctive use of surface and groundwater. Using numerical models, optimization algorithms, and machine learning, we created a new comprehensive methodological structure for optimal allocation of surface and groundwater resources and optimal extraction of groundwater. The surface and groundwater system was simulated by MODFLOW to reflect groundwater transport and aquifer conditions. The important Marvdasht aquifer in the south of Iran was used as an experimental study area to test the methodology. In this context, we developed an optimal conjunctive exploitation model for dry and wet years using two new evolutionary algorithms, i.e., whale optimization algorithm (WOA) and firefly algorithm (FA). These were used in combination with the group method of data handling (GMDH) and least squares support vector machine (LS-SVM) to estimate sustainable groundwater withdrawal. The results show that the FA is more efficient in calculating optimal conjunctive water supply so that about 61% of water needs were met in the worst scenario for surface water resources, while it was 52% using the WOA. By applying the optimal conjunctive model during the simulation period, the groundwater level increased by about 0.4 and 0.55 m using the WOA and FA, respectively. The results of Taylor’s diagram, box plot diagram, and rock diagram with error evaluation criteria, i.e., root mean square error (RMSE), mean absolute error (MAE), and Nash–Sutcliffe efficiency (NSE), showed that the GMDH (RMSE = 6.04 MCM, MAE = 3.89 MCM, and NSE = 0.99) was slightly better than LS-SVM (RMSE = 6.36 MCM, MAE = 4.50 MCM, and NSE = 0.98) to estimate optimal groundwater use. The results show that machine learning models are cost- and time-effective solutions to estimate optimal exploitation of groundwater resources in complex combined surface and groundwater supply problems. The methodology can be used to better estimate sustainable exploitation of groundwater resources by water resources managers.
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2.
  • Hosseinkhani, Zahra, et al. (författare)
  • Prevalence of alcohol consumption in most at-risk groups in Iran : a systematic review and meta-analysis
  • 2023
  • Ingår i: Journal of Substance Use. - : Informa UK Limited. - 1465-9891 .- 1475-9942. ; 28:2, s. 135-142
  • Forskningsöversikt (refereegranskat)abstract
    • Introduction: Many studies have assessed the prevalence of alcohol consumption in Iran. In this study, we investigated the prevalence of alcohol consumption in different groups. Material and Methods: We searched international and databases including PubMed, Web of Science, Scopus and we searched two main Farsi-language index databases including Scientific Information Database (SID) and the Irandoc. Grey literature search was also performed in Google Scholar, PsycINFO, ProQuest Dissertation and Theses without time limit until June 2020. All studies that reported the prevalence of alcohol consumption among Iranians were included in current study. Results: From 9,038 screened studies, 109 studies with 925,480 participants were included. The pooled prevalence of alcohol consumption was estimated 24% (95% CI: 18.0–31.0), 12% (95%CI: 10.0–14.0), 14% (95%CI: 13.0–15.0), 19% (95%CI: 13.0–26.0), 15% (95%CI: 3.0–28.0) among prisoners, general population, students, drivers, and street children, respectively. Conclusion: This systematic review indicated higher prevalence of alcohol consumption in prisoners, drivers, and street children than the general population and other subgroups. The distribution of the alcohol prevalence studies in different groups and provinces were heterogeneous. The lack of studies among some groups and in regions warrants further, attention.
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3.
  • Abe, O, et al. (författare)
  • Effects of chemotherapy and hormonal therapy for early breast cancer on recurrence and 15-year survival: an overview of the randomised trials
  • 2005
  • Ingår i: The Lancet. - 1474-547X. ; 365:9472, s. 1687-1717
  • Tidskriftsartikel (refereegranskat)abstract
    • Background Quinquennial overviews (1985-2000) of the randomised trials in early breast cancer have assessed the 5-year and 10-year effects of various systemic adjuvant therapies on breast cancer recurrence and survival. Here, we report the 10-year and 15-year effects. Methods Collaborative meta-analyses were undertaken of 194 unconfounded randomised trials of adjuvant chemotherapy or hormonal therapy that began by 1995. Many trials involved CMF (cyclophosphamide, methotrexate, fluorouracil), anthracycline-based combinations such as FAC (fluorouracil, doxombicin, cyclophosphamide) or FEC (fluorouracil, epirubicin, cyclophosphamide), tamoxifen, or ovarian suppression: none involved taxanes, trastuzumab, raloxifene, or modem aromatase inhibitors. Findings Allocation to about 6 months of anthracycline-based polychemotherapy (eg, with FAC or FEC) reduces the annual breast cancer death rate by about 38% (SE 5) for women younger than 50 years of age when diagnosed and by about 20% (SE 4) for those of age 50-69 years when diagnosed, largely irrespective of the use of tamoxifen and of oestrogen receptor (ER) status, nodal status, or other tumour characteristics. Such regimens are significantly (2p=0 . 0001 for recurrence, 2p<0 . 00001 for breast cancer mortality) more effective than CMF chemotherapy. Few women of age 70 years or older entered these chemotherapy trials. For ER-positive disease only, allocation to about 5 years of adjuvant tamoxifen reduces the annual breast cancer death rate by 31% (SE 3), largely irrespective of the use of chemotherapy and of age (<50, 50-69, &GE; 70 years), progesterone receptor status, or other tumour characteristics. 5 years is significantly (2p<0 . 00001 for recurrence, 2p=0 . 01 for breast cancer mortality) more effective than just 1-2 years of tamoxifen. For ER-positive tumours, the annual breast cancer mortality rates are similar during years 0-4 and 5-14, as are the proportional reductions in them by 5 years of tamoxifen, so the cumulative reduction in mortality is more than twice as big at 15 years as at 5 years after diagnosis. These results combine six meta-analyses: anthracycline-based versus no chemotherapy (8000 women); CMF-based versus no chemotherapy (14 000); anthracycline-based versus CMF-based chemotherapy (14 000); about 5 years of tamoxifen versus none (15 000); about 1-2 years of tamoxifen versus none (33 000); and about 5 years versus 1-2 years of tamoxifen (18 000). Finally, allocation to ovarian ablation or suppression (8000 women) also significantly reduces breast cancer mortality, but appears to do so only in the absence of other systemic treatments. For middle-aged women with ER-positive disease (the commonest type of breast cancer), the breast cancer mortality rate throughout the next 15 years would be approximately halved by 6 months of anthracycline-based chemotherapy (with a combination such as FAC or FEC) followed by 5 years of adjuvant tamoxifen. For, if mortality reductions of 38% (age <50 years) and 20% (age 50-69 years) from such chemotherapy were followed by a further reduction of 31% from tamoxifen in the risks that remain, the final mortality reductions would be 57% and 45%, respectively (and, the trial results could well have been somewhat stronger if there had been full compliance with the allocated treatments). Overall survival would be comparably improved, since these treatments have relatively small effects on mortality from the aggregate of all other causes. Interpretation Some of the widely practicable adjuvant drug treatments that were being tested in the 1980s, which substantially reduced 5-year recurrence rates (but had somewhat less effect on 5-year mortality rates), also substantially reduce 15-year mortality rates. Further improvements in long-term survival could well be available from newer drugs, or better use of older drugs.
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5.
  • Aghelpour, Pouya, et al. (författare)
  • Evaluating Three Supervised Machine Learning Algorithms (LM, BR, and SCG) for Daily Pan Evaporation Estimation in a Semi-Arid Region
  • 2022
  • Ingår i: Water (Switzerland). - : MDPI AG. - 2073-4441. ; 14:21
  • Tidskriftsartikel (refereegranskat)abstract
    • Evaporation is one of the main components of the hydrological cycle, and its estimation is crucial and important for water resources management issues. Access to a reliable estimator tool for evaporation simulation is important in arid and semi-arid areas such as Iran, which lose more than 70% of their received precipitation by evaporation. Current research employs the Bayesian Regularization (BR) and Scaled Conjugate Gradient (SCG) algorithms for training the Multilayer Perceptron (MLP) model (as MLP-BR and MLP-SCG) and comparing their performance with the Levenberg–Marquardt (LM) algorithm (as MLP-LM). For this purpose, 16 meteorological variables were used on a daily scale; including temperature (5 variables), air pressure (4 variables), and relative humidity (6 variables) as input data sets, and pan evaporation as the target variable of the MLP model. The surveys were conducted during the period of 2006–2021 in Fars Province in Iran, which is a semi-arid region and has many natural lakes. Various combinations of input-target pairs were tested by several learning algorithms, resulting in seven input scenarios: (1) temperature-based (T), (2) pressure-based (F), (3) humidity-based (RH), (4) temperature–pressure-based (T-F), (5) temperature–humidity-based (T-RH), (6) pressure–humidity-based (F-RH) and (7) temperature–pressure–humidity-based (T-F-RH). The results indicated the relative superiority of the three-component scenario of T-F-RH, and a considerable weakness in the single-component scenario of RH compared with others. The best performance with a root mean square error (RMSE) equal to 1.629 and 1.742 mm per day and a Wilmott Index (WI) equal to 0.957 and 0.949 (respectively for validation and test periods) belonged to the MLP-BR model. Additionally, the amount of R2 (greater than 84%), Nash-Sutcliff efficiency (greater than 0.8) and normalized RMSE (less than 0.1) all indicate the reliability of the estimates provided for the daily pan evaporation. In the comparison between the studied training algorithms, two algorithms, BR and SCG, in most cases, showed better performance than the powerful and common LM algorithm. The obtained results suggest that future researchers in this field consider BR and SCG training algorithms for the supervised training of MLP for the numerical estimation of pan evaporation by the MLP model.
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6.
  • Aghili, Rokhsareh, et al. (författare)
  • Psychosocial factors and glycemic control in insulin-naïve and insulin-experienced people with type 2 diabetes : a path analysis model
  • 2018
  • Ingår i: International Journal of Diabetes in Developing Countries. - : Springer Science and Business Media LLC. - 0973-3930 .- 1998-3832. ; 38:3, s. 289-297
  • Tidskriftsartikel (refereegranskat)abstract
    • The purpose of this study was to compare the status of psychosocial factors and glycemic control in insulin-naïve and insulin-experienced people with type 2 diabetes (T2D). In this observational study on people with T2D, demographic, self-care behavior, resources, and affective variables as well as health-related quality of life were assessed and compared in insulin-naïve and insulin-experienced considering the number of oral glucose-lowering drugs (OGLDs). Measured variable path analysis was used to test the association among variables and their effect on HbA1c in both groups. In total, 215 insulin-naïve and 165 insulin-experienced patients were recruited in this study. The mean duration of diabetes was 11.7 ± 7.0 years in insulin-experienced and 6.8 ± 5.4 years in insulin-naïve (p < 0.001). The mean hemoglobin A1c (HbA1c) was significantly higher in insulin-experienced subjects irrespective of the number of OGLDs [68 ± 20 mmol/mol (8.4 ± 1.8%) vs. 56 ± 16 mmol/mol (7.3 ± 1.4%); p < 0.001]. Moreover, insulin-experienced subjects had significantly higher level of diabetes-related distress (2.2 ± 0.9 vs. 1.9 ± 0.8), depression (9.5 ± 5.5 vs. 8.1 ± 5.1), anxiety (18.3 ± 12.0 vs. 15.1 ± 10.5), and lower knowledge of insulin use considering the results of 9-item insulin-use subscale of Michigan diabetes knowledge test (mean 3.9 ± 1.8) compared to insulin-naïve subjects (p < 0.05). Higher levels of distress, depression, and anxiety are found in insulin-experienced people with T2D. Therefore, one should be aware that, at the time of insulin need/initiation, people with T2D have reached a more vulnerable state and this should be taken into consideration when implementing a complex insulin initiation plan.
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7.
  • Al-Sulttani, Ali Omran, et al. (författare)
  • Thermal effectiveness of solar collector using Graphene nanostructures suspended in ethylene glycol–water mixtures
  • 2022
  • Ingår i: Energy Reports. - : Elsevier BV. - 2352-4847. ; 8, s. 1867-1882
  • Tidskriftsartikel (refereegranskat)abstract
    • Flat plate solar collectors (FPSCs) are the most often used as solar collectors due to their easiness of installation and usage. The current research investigates the energy efficiency of FPSC using different mass concentration with varied base fluids containing Graphene nanofluids (T-Gr). Mass concentration of 0.1%-wt., 0.075%-wt., 0.050%-wt. and 0.025%-wt. were mixed with ethylene glycol (EG) and distilled water (DW) in different rations. The operating conditions were volumetric flowrate (1.5, 1 and 0.5) LPM 50 °C-input fluid temperature and 800 W/m2-global solar irradiation. Scanning electron microscope (SEM) and energy dispersive X-ray (EDX) were used to synthesize the thermally treated nanomaterial. The theoretical investigation indicated that using T-Gr nanosuspensions increased the FPSC efficiency in comparison with the host fluid for all examined mass concentrations and volumetric flowrates. In quantitative terms, the maximum thermal effectiveness improvement for the EG, (DW:70 + EG:30) and DW:EG (DW:50 + EG:50) and using flowrates of (1.5, 1 and 0.5) LPM were 12.54%, 12.46% and 12.48%. In addition, the research results pointed that the essential parameters (i.e., loss energy (FRUL)) and gain energy (FR (τα)) of the T-Gr nanofluids were increased significantly.
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8.
  • Alhelfi, Ali Kadhim Hadi, et al. (författare)
  • Assessing Learning in Higher Education
  • 2012
  • Rapport (populärvet., debatt m.m.)abstract
    • Assessment is a key activity within the higher education system. From the student´s perspective, assessment shapes what is to be learned; from the perspective of the educator it gives clear inputs about the quality of learning. Thus, as defined by the term, ‘Constructive alignment’, by careful planning of the assessment strategy and wise selection of the assessment methods, the teaching-learning experience can be designed in an aligned manner towards the achievement of the learning outcomes. Although, defined in different ways, the basic purpose of assessment is to work as a feedback tool to both, students and teachers, to improve the student learning. In this work, we review and comment on theoretical aspects of assessment including its significance and characteristics. Moreover, some important considerations regarding the design of the assessment activities are presented, together with the description of some methods for assessing learning. With this work we would like to invite the reader to reevaluate the significance of assessment within the learning experience, and by this, hopefully the educator is “inspired” to improve the assessment activities in the classroom or another less conventional learning space.
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9.
  • Asgharian, Hossein, et al. (författare)
  • Green links : corporate networks and environmental performance
  • 2023
  • Ingår i: Review of Finance. - 1572-3097 .- 1875-824X.
  • Tidskriftsartikel (refereegranskat)abstract
    • We investigate the propagation of environmental performance among competitors and in customer–supplier relationships. We find a significant causal effect among competitors, while the propagation from customers to suppliers and vice versa appears insignificant or does not survive identification tests. The effect is stronger among firms in highly concentrated competitor networks and toward firms with less market and bargaining power than their competitors. We also find significantly stronger propagation of environmental performance among competitors engaged in joint research and development activity. These results show that the propagation stems from both competitive pressure and technological spillover. Importantly, we find that propagation is strong when the competitor improves its environmental performance and when the firm’s own environmental performance is poor initially, alleviating concerns that improvements in performance are concentrated among firms, which are already green. Overall, network effects among competing firms are a significant force shaping environmental performance, and a force mostly for good. 
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10.
  • Azizi, Zahra, et al. (författare)
  • How accurate is the CASPT2 method?
  • 2006
  • Ingår i: Physical Chemistry Chemical Physics. - : Royal Society of Chemistry (RSC). - 1463-9084 .- 1463-9076. ; 8:23, s. 2727-2732
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper is a reply to a recent paper on the isomers of trisulfur oxides (Chem. Commun., 2005, 3712) where the accuracy of the CASPT2 method is called in question. We illustrate that their results are due to an inadequate choice of active orbitals. Some results for related O and S containing molecules are also presented to strengthen the argumentation. It is concluded that the CASPT2 method is accurate to at least 0.1 eV (2 kcal mol(-1)) for this type of systems.
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