42 research outputs found
The smart safety Shoe: A new type of safety shoe that helps prevent lower back problems and opens the door to a new era of preventive safety footwear
No full textThe smart safety shoe is a concept safety shoe that has been in development as a collaboration between Allshoes safety footwear and TU Delft since 2020. Previous work on the shoe consisted of 2 graduation projects and a student course which resulted in the current concept of an injury preventing safety shoe focused on preventing lower back pain in the logistics sector. The shoe works by using pressure sensors and machine learning to detect unhealthy postures while its wearer has to lift various objects as part of their job (manual handling). This project focused on further developing the concept of the smart safety shoe and evaluating the prototypes from the last two projects. Previous projects provided two different pressure sensor layouts which are evaluated using a high-end pressure sensing insole. A manual handling experiment was set up and performed on 16 different participants from a lab and a warehouse. During testing participants were instructed to perform manual handling while holding 5 different postures. It was possible to train a machine learning model using the various pressure profiles gathered from the experiment. Using this model, the two sensor layouts from the previous projects were evaluated for their ability to detect the 5 predetermined postures. It was found that the latest layout outperformed the previous one and was therefore selected for further development of the smart safety shoe.The integration of various other sensors and actuators was evaluated, and the core functions of the shoe were defined with an indication towards future improvements of the smart safety shoe.The shoe has now been publicly presented by Allshoes and the goal is to have the product on the market by the end of 2025. In order for this to happen further prototyping is needed to create an improved machine learning model based on the selected sensor layout. The shoe shows promising responses from current safety shoe clients. When finally launched it will be part of a new type of protective equipment focused on prevention.Design for Interactio
Gap Study for the Impact of Braced Deep Excavation on the Behavior of Excavation Bed
No full textTwo geotechnical topics were investigated in this research; shored deep excavation and modulus of subgrade reaction. Both topics were extensively studied by many earlier researchers. The aim of this study is to answer the following question, Is deep excavation effects on excavation bed behavior of sufficiently investigated? Or there still un-studied gaps should be fulfilled?”. Litterateurs were collected, reviewed and classified for both topics especially in the interaction zone between the two topics, and it is concluded that deep excavation effect on the modulus of subgrade reaction values and distribution at excavation bed level is not sufficiently addressed especially the effect of excavation bed heave and stiffness of shoring syste
Study of the Behavior of Floating Stone Columns in Soft Clay Formations Using Numerical Modeling
No full textOPTIMIZING CEMENT KILN DUST DENSITY TO IMPROVE LANDFILL AIR SPACE UTILIZATION
No full textOptimizing the density of waste materials in landfills by proper compaction prolongs the facility life due to the efficient use of landfill airspace. Cement kiln dust (CKD) is a waste by-product produced in huge amounts which exceeds the used quantities in the cement recycling industry and beneficial CKD applications. The vast amount of CKD is almost landfilled in its loose state in Egypt which causes a big loss in landfill airspace due to the low density of CKD. The hydraulic binder effect and dusty behavior of reactive CKD complicates its compaction process. Accordingly, this research was performed to investigate CKD compaction properties with three types of lubricants, which are potable water, salt water and waste oil. Maximum dry density (MDD) and optimum moisture content (OMC) for these lubricant types and different wetting methods were investigated in order to improve the landfill air space utilization and to reduce the dusty effect of CKD during compaction. The effect of immediate compaction after wetting and the effect of compaction delay by allowing CKD to hydrate initially for a certain period were studied. Compaction energy and methods of the wetting of CKD either by full submergence in water or prewetting were tested. The maximum weights of a disposed CKD and durations required to fill an intended landfill air space for different CKD conditions, lubricant types and compaction methods were presented for a case study in Ain Sokhna, Egypt.Optimiziranje gustoće otpadnih materijala na odlagalištima pravilnim zbijanjem produljuje vijek trajanja objekta zahvaljujući učinkovitom korištenju odlagališnog prostora. Prašina iz peći za dobivanje cementa (PDC) je otpadni nusproizvod koji nastaje u velikim količinama koje znatno premašuju količine materijala koji se može reciklirati u cementnoj industriji i korisno upotrijebiti na druge načine. Velika količina PDC-a u Egiptu se odlaže na odlagališta u rastresitom stanju, što uzrokuje veliki gubitak odlagališnog prostora zbog niske gustoće PDC-a. Učinak hidrauličkog veziva i ponašanje reaktivnog PDC-a kao prašinastog materijala komplicira proces njegovog zbijanja. U skladu s tim, ovo je istraživanje provedeno kako bi se ispitala svojstva zbijanja PDC-a s tri vrste ovlaživača/lubrikanata pitka voda, slana voda i otpadno ulje. Maksimalna suha gustoća i optimalni sadržaj vlage ispitani su za te vrste ovlaživača/lubrikanata i za različite metode vlaženja kako bi se poboljšala iskorištenost odlagališnog prostora i smanjio negativni učinak PDC-a tijekom zbijanja. Proučavani su učinak neposrednog zbijanja nakon vlaženja i učinak odgode zbijanja dopuštanjem PDC-u da se inicijalno hidratizira tijekom određenog razdoblja, a zatim odradi zbijanje. Ispitana je energija zbijanja i metode vlaženja PDC-a potpunim uranjanjem u fluid ili prethodnim vlaženjem. Prezentirane su maksimalne težine odloženog PDC-a i vrijeme potrebno za ispunjavanje predviđenog odlagališnog prostora za različite PDC uvjete, vrste ovlaživača/lubrikanata i metode zbijanja za studiju slučaja Ain Sokhna u Egiptu
Behavior of Embankments Constructed on Soft Soil Deposits Reinforced with Rigid Inclusions
No full textLarge settlement associated with the construction of embankments on soft soil deposits is a challenging geotechnical problem that needs a special treatment. Reinforcing the embankments utilizing geosynthetics is an effective technique used to reduce the differential settlement, while the total settlement is unchanged. A more efficient technique is utilizing a combination between soft soil reinforcement using piles or rigid inclusions, thus increasing the equivalent stiffness of the entire soft soil stratum, and a load transfer layer reinforced by one or more layers of geosynthetics on top of the inclusions' head, in order to improve the load distribution process between the rigid elements. In this paper, the behavior of soft soil deposits reinforced with rigid inclusions is studied using three-dimensional finite element analysis, utilizing the "PLAXIS 3D 2020" software. Verification of the adopted modeling procedures is performed by the back analysis of a well-documented case study of a physical laboratory scaled model. Results of the numerical model showed a good agreement with the laboratory measurements in terms of both the settlement and load distribution aspects. Furthermore, results of both the developed numerical model and selected performed numerical analyses, from the literature, for the same case study, were compared showing better efficiency of the developed model compared to others and more consistency with the real behavior of the laboratory model. The verified model confirmed the efficiency of increasing the friction angle of the embankment on the load transfer mechanism between the rigid inclusions, and hence decreasing the resultant settlement
Heavy metals concentration (μg /L) in water of different treatments (Means± SE).
No full textHeavy metals concentration (μg /L) in water of different treatments (Means± SE).</p
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Ultrafast His‐Tagged Protein Purification
No full textThis article details how to use a vortex fluidic device (VFD) to accelerate protein purification via immobilized metal affinity chromatography (IMAC). Building upon a previous report of VFD-based purification, we introduce a membrane insert to simplify the purification protocol and the resin recovery step. This new platform can be adapted to different types of IMAC resins and purification membranes. Proteins can be purified directly from clarified lysate, non-clarified lysate, and even non-lysed cultures without concerns of system clogging. Strong binding between the Ni2+ and the target protein's His6-tag effectively captures the target protein on IMAC resins or membranes placed in the VFD. Continuous flow of different solutions through the VFD allows dynamic binding, washing, and elution of the target protein. Furthermore, the system dramatically accelerates protein purification; a typical purification from cell lysate requires approximately 4 min. Herein, we demonstrate the single-step purification of two His6-tagged proteins from both clarified and non-clarified cell lysates without requiring batch binding. © 2024 The Author(s). Current Protocols published by Wiley Periodicals LLC. Basic Protocol 1: Preparation of the resin-loaded membrane insert and the vortex fluidic device (VFD) setup prior to purification Basic Protocol 2: Purification of His6-tagged proteins using the VFD Alternate Protocol: VFD-mediated His6-tagged protein purification from non-clarified lysate Support Protocol: Preparation of chemically modified glass fiber membrane for VFD-mediated immobilized metal affinity chromatography purification
Correction: Epidemiology and outcomes of early-onset AKI in COVID-19-related ARDS in comparison with non-COVID-19-related ARDS: insights from two prospective global cohort studies (Critical Care, (2023), 27, 1, (3), 10.1186/s13054-022-04294-5)
No full textFollowing publication of the original article [1], the authors identified that the collaborating authors part of the collaborating author group CCCC Consortium was missing. The collaborating author group is available and included as Additional file 1 in this article
Ischiodon aegyptius
No full text<i>Ischiodon aegyptius</i> (Wiedemann, 1830) <p> <i>Syrphus aegyptius</i> Wiedemann, 1830: 133. Type locality: Egypt & Sudan (Nubia).</p> <p> <i>Musca</i> <i>nigra</i> Forskål, 1775: xxiv. Egypt, Arabia.</p> <p> <i>Syrphus senegalensis</i> Guérin-Méneville, 1832: pl. 99. Type locality: Senegal.</p> <p> <i>Sphaerophoria annulipes</i> (Macquart, 1842): 163. Type locality: " Egypt ".</p> <p> <i>Syrphus longicornis</i> Macquart, 1842: 154. Type locality: South Africa.</p> <p> <i>Syrphus natalensis</i> Macquart, 1846: 262. Type locality: South Africa (Port Natal).</p> <p> <i>Syrphus felix</i> Walker, 1852: 229. Type locality: Canary Is.</p> <p> <i>Sphaerophoria pyrrura</i> Bigot, 1884: 99. Type locality: Senegal.</p> <p> <i>Sphaerophoria borbonica</i> Bigot, 1884: 100. Type locality: Réunion.</p> <p> <i>Syrphus brachypterus</i> (Thomson, 1869): 496. Type locality: Portugal (Madeira).</p> <p> <b>Material examined</b>: 2 females, Kirdassa, 3.IV.2002, leg. El-Hawagry; 1 male, 2 females, Gabel Elba, 15.II– 31.IV.1923, leg. Tewfik, the same specimen that was published in Shaumar & Kamal (1978); 1 male, Ezbet El- Nakhl, 3.IV.1925, leg. Tewfik; 1 male Ghoubbet El-Boos, VIII. 1929, leg. H.C.E. & M.T.; 1 male, Helwan, 12.IX.1925, leg. Farag; 1 female, Wadi Um Elek, 15.10.1928, leg. Farag [EFC].</p> <p> <b>World distribution</b>: AF: Widespread. PA: Balearic Is. Canary Is., Egypt, Iran, Madeira, S. Spain, Syria, Italy.</p> <p> <b>Egyptian localities</b>: Coastal Strip: Alexandria, Cleopatra, El-Dekheila, Mariout. Eastern Desert: Fayed, Ismailiya, Suez Road, Wadies south east of Cairo. Gebel Elba: Wadi Edeib. Lower Nile Valley & Delta: Abu- Rawash, Behaira, Beni Sueif, Cairo, Ezbet El-Nakhl, Faraskour, Gezeirah, Giza, Helwan, Itai El-Baroud, Khanka, Kirdassa, Kombira, El-Mansouriya, Magadla, Pyramids, Shubra, Tisfa, Turah. Sinai: El-Arish, Rafah, Wadi El- Arbaein, Wadi El-Rabba. Upper Nile Valley: Aswan. Western Desert: Kharga Oasis, Siwa Oasis. [Sources: Efflatoun (1922), Shaumar & Kamal (1978) and the examined material collected by the first author].</p> <p> <b>Activity period in Egypt</b>: Throughout the year.</p> <p> <b>Remarks</b>: Adults fly low through sparse ground vegetation and settle on flowers of low-growing herbs (Speight 2017).</p>Published as part of <i>El-Hawagry, Magdi S. & Gilbert, Francis, 2019, Catalogue of the Syrphidae of Egypt (Diptera), pp. 201-248 in Zootaxa 4577 (2)</i> on page 209, DOI: 10.11646/zootaxa.4577.2.1, <a href="http://zenodo.org/record/2629643">http://zenodo.org/record/2629643</a>
