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  1. Article: A man with an alcoholic-related duodenal perforation after losing his job due to the SARS-COV-2 pandemic.

    Mahdi, Dana / Ali, Mohamed Adam

    Clinical case reports

    2021  Volume 9, Issue 10, Page(s) e04896

    Abstract: Pneumoperitoneum is a medical emergency, diagnosed by subdiaphragmatic free air upon X-ray. The underlying cause, in this case a perforated duodenal ulcer from increased alcohol intake, must also be identified and treated. Public health crisis can impact ...

    Abstract Pneumoperitoneum is a medical emergency, diagnosed by subdiaphragmatic free air upon X-ray. The underlying cause, in this case a perforated duodenal ulcer from increased alcohol intake, must also be identified and treated. Public health crisis can impact physical health to varying degrees across socioeconomic groups.
    Language English
    Publishing date 2021-10-04
    Publishing country England
    Document type Journal Article
    ZDB-ID 2740234-4
    ISSN 2050-0904
    ISSN 2050-0904
    DOI 10.1002/ccr3.4896
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  2. Article ; Online: The impact of selected parameters on the efficiency of a photovoltaic installation with bifacial modules in local conditions

    Patrycja Walichnowska / Adam Idzikowski / Sahib M. Mahdi

    Budownictwo o Zoptymalizowanym Potencjale Energetycznym, Vol 12, Pp 87-

    2023  Volume 93

    Abstract: The article presents a comparison of the results of simulation by a photovoltaic installation with bifacial modules. The analyzed 20 kWp PV installation was located in the Kuyavian-Pomeranian Voivodeship. The article compares how the energy production of ...

    Abstract The article presents a comparison of the results of simulation by a photovoltaic installation with bifacial modules. The analyzed 20 kWp PV installation was located in the Kuyavian-Pomeranian Voivodeship. The article compares how the energy production of installations with bifacial modules changes depending on the angle of inclination, the distance between the rows of modules and the orientation. The results obtained in the study indicate that albedo is an important, but not the only parameter to be considered when designing a farm with bifacial modules.
    Keywords photovoltaic ; efficiency ; bifacial module ; pvsyst ; Technology ; T ; Ecology ; QH540-549.5
    Language English
    Publishing date 2023-06-01T00:00:00Z
    Publisher The Publishing Office of Czestochowa University of Technology
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: The association between blood groups, Rhesus factors, body mass index and obesity among pregnant women at Gadarif Maternity Hospital, Eastern Sudan.

    Bashir, Amal O / Hassan, Ahmed Ali / Mahdi, E L Bagir / Adam, Gamal K / AlHabardi, Nadiah / Adam, Ishag

    BMC pregnancy and childbirth

    2023  Volume 23, Issue 1, Page(s) 801

    Abstract: Background: The existing evidence regarding the link between blood groups and obesity remains inconclusive, and there is a noticeable lack of data on the potential association between blood groups and obesity during pregnancy. Consequently, this study ... ...

    Abstract Background: The existing evidence regarding the link between blood groups and obesity remains inconclusive, and there is a noticeable lack of data on the potential association between blood groups and obesity during pregnancy. Consequently, this study aimed to investigate the association between blood groups, body mass index (BMI), and obesity among pregnant women receiving care at Gadarif Maternity Hospital in eastern Sudan.
    Methods: This cross-sectional study was conducted in eastern Sudan during the period from April to September 2022. A questionnaire was employed to gather sociodemographic information from pregnant women. BMI was computed based on weight and height. Blood groups determinations were made using the agglutination method which is commonly used in the study's region. Multinominal and multiple linear regression analyses were performed, and adjusted for covariates in the regression models.
    Results: Eight hundred and thirty-three pregnant women were enrolled with a median (interquartile range, IQR) gestational age of 10.0 (9.3‒11.0) weeks. The median (IQR) BMI of the women was 26.3(24.2‒29.4) kg/m
    Conclusions: Blood group O was associated with obesity and high BMI among pregnant women in eastern Sudan. Rhesus factors were not associated with obesity.
    MeSH term(s) Female ; Pregnancy ; Humans ; Infant ; Male ; Body Mass Index ; Overweight/complications ; Pregnant Women ; Sudan/epidemiology ; Cross-Sectional Studies ; Blood Group Antigens ; Hospitals, Maternity ; Obesity/epidemiology ; Obesity/complications ; Surveys and Questionnaires ; Gravidity ; Risk Factors
    Chemical Substances Blood Group Antigens
    Language English
    Publishing date 2023-11-17
    Publishing country England
    Document type Journal Article
    ZDB-ID 2059869-5
    ISSN 1471-2393 ; 1471-2393
    ISSN (online) 1471-2393
    ISSN 1471-2393
    DOI 10.1186/s12884-023-06125-z
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  4. Article ; Online: A man with an alcoholic‐related duodenal perforation after losing his job due to the SARS‐COV‐2 pandemic

    Dana Mahdi / Mohamed Adam Ali

    Clinical Case Reports, Vol 9, Iss 10, Pp n/a-n/a (2021)

    2021  

    Abstract: Abstract Pneumoperitoneum is a medical emergency, diagnosed by subdiaphragmatic free air upon X‐ray. The underlying cause, in this case a perforated duodenal ulcer from increased alcohol intake, must also be identified and treated. Public health crisis ... ...

    Abstract Abstract Pneumoperitoneum is a medical emergency, diagnosed by subdiaphragmatic free air upon X‐ray. The underlying cause, in this case a perforated duodenal ulcer from increased alcohol intake, must also be identified and treated. Public health crisis can impact physical health to varying degrees across socioeconomic groups.
    Keywords medical emergency ; peptic ulcerative disease ; pneumoperitoneum ; public health ; Medicine ; R ; Medicine (General) ; R5-920
    Language English
    Publishing date 2021-10-01T00:00:00Z
    Publisher Wiley
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Sensitivity analysis methods in the biomedical sciences.

    Qian, George / Mahdi, Adam

    Mathematical biosciences

    2020  Volume 323, Page(s) 108306

    Abstract: Sensitivity analysis is an important part of a mathematical modeller's toolbox for model analysis. In this review paper, we describe the most frequently used sensitivity techniques, discussing their advantages and limitations, before applying each method ...

    Abstract Sensitivity analysis is an important part of a mathematical modeller's toolbox for model analysis. In this review paper, we describe the most frequently used sensitivity techniques, discussing their advantages and limitations, before applying each method to a simple model. Also included is a summary of current software packages, as well as a modeller's guide for carrying out sensitivity analyses. Finally, we apply the popular Morris and Sobol methods to two models with biomedical applications, with the intention of providing a deeper understanding behind both the principles of these methods and the presentation of their results.
    MeSH term(s) Biomedical Research/methods ; Biomedical Research/standards ; Data Interpretation, Statistical ; Humans ; Models, Theoretical
    Language English
    Publishing date 2020-01-14
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 1126-5
    ISSN 1879-3134 ; 0025-5564
    ISSN (online) 1879-3134
    ISSN 0025-5564
    DOI 10.1016/j.mbs.2020.108306
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 1534: Show issues Location:
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    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
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  6. Article ; Online: Identifiability Analysis and Noninvasive Online Estimation of the First-Order Neural Activation Dynamics in the Brain With Closed-Loop Transcranial Magnetic Stimulation.

    Alavi, Seyed Mohammad Mahdi / Mahdi, Adam / Vila-Rodriguez, Fidel / Goetz, Stefan M

    IEEE transactions on bio-medical engineering

    2023  Volume 70, Issue 9, Page(s) 2564–2572

    Abstract: Background: Neurons demonstrate very distinct nonlinear activation dynamics, influenced by the neuron type, morphology, ion channel expression, and various other factors. The measurement of the activation dynamics can identify the neural target of ... ...

    Abstract Background: Neurons demonstrate very distinct nonlinear activation dynamics, influenced by the neuron type, morphology, ion channel expression, and various other factors. The measurement of the activation dynamics can identify the neural target of stimulation and detect deviations, e.g., for diagnosis. This paper describes a tool for closed-loop sequential parameter estimation (SPE) of the activation dynamics through transcranial magnetic stimulation (TMS). The proposed SPE method operates in real time, selects ideal stimulus parameters, detects and processes the response, and concurrently estimates the input-output (IO) curve and the first-order approximation of the activated neural target.
    Objective: To develop a method for concurrent SPE of the first-order activation dynamics and IO curve with closed-loop TMS.
    Method: First, identifiability of an integrated model of the first-order neural activation dynamics and IO curve is assessed, demonstrating that at least two IO curves need to be acquired with different pulse widths. Then, a two-stage SPE method is proposed. It estimates the IO curve by using Fisher information matrix (FIM) optimization in the first stage and subsequently estimates the membrane time constant as well as the coupling gain in the second stage. The procedure continues in a sequential manner until a stopping rule is satisfied.
    Results: The results of 73 simulation cases confirm the satisfactory estimation of the membrane time constant and coupling gain with average absolute relative errors (AREs) of 6.2% and 5.3%, respectively, with an average of 344 pulses (172 pulses for each IO curve or pulse width). The method estimates the IO curves' lower and upper plateaus, mid-point, and slope with average AREs of 0.2%, 0.7%, 0.9%, and 14.5%, respectively. The conventional time constant estimation method based on the strength-duration (S-D) curve leads to 33.3% ARE, which is 27.0% larger than 6.2% ARE obtained through the proposed real-time FIM-based SPE method in this paper.
    Conclusions: SPE of the activation dynamics requires acquiring at least two IO curves with different pulse widths, which needs a controllable TMS (cTMS) device with adjustable pulse duration.
    Significance: The proposed SPE method enhances the cTMS functionality, which can contribute novel insights in research and clinical studies.
    MeSH term(s) Transcranial Magnetic Stimulation ; Brain ; Cyclohexanes ; Mesylates
    Chemical Substances cyclohexane-1,2,4-tris(methylenesulfonate) (151301-57-4) ; Cyclohexanes ; Mesylates
    Language English
    Publishing date 2023-09-05
    Publishing country United States
    Document type Journal Article
    ZDB-ID 160429-6
    ISSN 1558-2531 ; 0018-9294
    ISSN (online) 1558-2531
    ISSN 0018-9294
    DOI 10.1109/TBME.2023.3253674
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 425: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

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  7. Article: CENTER PROBLEM FOR A THIRD-ORDER ODES.

    Mahdi, Adam

    International journal of bifurcation and chaos in applied sciences and engineering

    2014  Volume 23, Issue 5, Page(s) 1350078

    Abstract: We obtain necessary and sufficient conditions for the existence of a center on a local center manifold for three 4-parameter families of quadratic systems on ... ...

    Abstract We obtain necessary and sufficient conditions for the existence of a center on a local center manifold for three 4-parameter families of quadratic systems on ℝ
    Language English
    Publishing date 2014-03-21
    Publishing country Singapore
    Document type Journal Article
    ZDB-ID 2003727-2
    ISSN 0218-1274
    ISSN 0218-1274
    DOI 10.1142/S0218127413500788
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  8. Book ; Online: LT-ViT

    Marikkar, Umar / Atito, Sara / Awais, Muhammad / Mahdi, Adam

    A Vision Transformer for multi-label Chest X-ray classification

    2023  

    Abstract: Vision Transformers (ViTs) are widely adopted in medical imaging tasks, and some existing efforts have been directed towards vision-language training for Chest X-rays (CXRs). However, we envision that there still exists a potential for improvement in ... ...

    Abstract Vision Transformers (ViTs) are widely adopted in medical imaging tasks, and some existing efforts have been directed towards vision-language training for Chest X-rays (CXRs). However, we envision that there still exists a potential for improvement in vision-only training for CXRs using ViTs, by aggregating information from multiple scales, which has been proven beneficial for non-transformer networks. Hence, we have developed LT-ViT, a transformer that utilizes combined attention between image tokens and randomly initialized auxiliary tokens that represent labels. Our experiments demonstrate that LT-ViT (1) surpasses the state-of-the-art performance using pure ViTs on two publicly available CXR datasets, (2) is generalizable to other pre-training methods and therefore is agnostic to model initialization, and (3) enables model interpretability without grad-cam and its variants.

    Comment: 5 pages, 2 figures
    Keywords Computer Science - Computer Vision and Pattern Recognition ; Computer Science - Machine Learning
    Subject code 006
    Publishing date 2023-11-13
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Article ; Online: A formalism for sequential estimation of neural membrane time constant and input-output curve towards selective and closed-loop transcranial magnetic stimulation

    Alavi, S M Mahdi / Vila-Rodriguez, Fidel / Mahdi, Adam / Goetz, Stefan M

    Journal of neural engineering

    2022  Volume 19, Issue 5

    Abstract: Objective. ...

    Abstract Objective.
    MeSH term(s) Brain/physiology ; Evoked Potentials, Motor/physiology ; Motor Cortex/physiology ; Transcranial Magnetic Stimulation/methods
    Language English
    Publishing date 2022-09-19
    Publishing country England
    Document type Journal Article
    ZDB-ID 2170901-4
    ISSN 1741-2552 ; 1741-2560
    ISSN (online) 1741-2552
    ISSN 1741-2560
    DOI 10.1088/1741-2552/ac8ed5
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    Zs.A 6071: Show issues Location:
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  10. Article ; Online: Closed-loop optimal and automatic tuning of pulse amplitude and width in EMG-guided controllable transcranial magnetic stimulation.

    Alavi, S M Mahdi / Vila-Rodriguez, Fidel / Mahdi, Adam / Goetz, Stefan M

    Biomedical engineering letters

    2022  Volume 13, Issue 2, Page(s) 119–127

    Abstract: This paper proposes an efficient algorithm for automatic and optimal tuning of pulse amplitude and width for sequential parameter estimation (SPE) of the neural membrane time constant and input-output (IO) curve parameters in closed-loop electromyography- ...

    Abstract This paper proposes an efficient algorithm for automatic and optimal tuning of pulse amplitude and width for sequential parameter estimation (SPE) of the neural membrane time constant and input-output (IO) curve parameters in closed-loop electromyography-guided (EMG-guided) controllable transcranial magnetic stimulation (cTMS). The proposed SPE is performed by administering a train of optimally tuned TMS pulses and updating the estimations until a stopping rule is satisfied or the maximum number of pulses is reached. The pulse amplitude is computed by the Fisher information maximization. The pulse width is chosen by maximizing a normalized depolarization factor, which is defined to separate the optimization and tuning of the pulse amplitude and width. The normalized depolarization factor maximization identifies the critical pulse width, which is an important parameter in the identifiability analysis, without any prior neurophysiological or anatomical knowledge of the neural membrane. The effectiveness of the proposed algorithm is evaluated through simulation. The results confirm satisfactory estimation of the membrane time constant and IO curve parameters for the simulation case. By defining the stopping rule based on the satisfaction of the convergence criterion with tolerance of 0.01 for 5 consecutive times for all parameters, the IO curve parameters are estimated with 52 TMS pulses, with absolute relative estimation errors (AREs) of less than 7%. The membrane time constant is estimated with 0.67% ARE, and the pulse width value tends to the critical pulse width with 0.16% ARE with 52 TMS pulses. The results confirm that the pulse width and amplitude can be tuned optimally and automatically to estimate the membrane time constant and IO curve parameters in real-time with closed-loop EMG-guided cTMS.
    Language English
    Publishing date 2022-12-30
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2602422-6
    ISSN 2093-985X ; 2093-9868
    ISSN (online) 2093-985X
    ISSN 2093-9868
    DOI 10.1007/s13534-022-00259-3
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