Filtern
Erscheinungsjahr
Dokumenttyp
- Wissenschaftlicher Artikel (223) (entfernen)
Sprache
- Englisch (223) (entfernen)
Volltext vorhanden
- nein (223) (entfernen)
Schlagworte
- CDK (2)
- OCSR (2)
- Polymer-Elektrolytmembran-Brennstoffzelle (2)
- hydraulic compression (2)
- modular stack design (2)
- open quantum systems (2)
- water electrolysis (2)
- carbon nanofibers, platinum electrodeposition, ele ctrochemical surface area (1)
- 360 degree Feedback (1)
- AI (1)
- Additive manufacturing Directed energy deposition-arc 316L stainless steel Corrosion behavior Electrochemical corrosion (1)
- Aerosol (1)
- Assessment Center (1)
- Augmented (1)
- Augmented Electromagnetic Accelerators (1)
- Augmented Multiphase (1)
- Augmented Multiphase Rail Launcher (1)
- Augmented Three-Phase AC-Railgun (1)
- Biomedical monitoring, Hospitals, Electrocardiography, Wireless communication, Patient monitoring, Wireless sensor networks (1)
- Carboxylate (1)
- Case-Study (1)
- Catalysis (1)
- Cell-free implant (1)
- Chemical image depiction (1)
- Chemical space (1)
- Cheminformatics (1)
- Chemistry Development Kit (1)
- Chemistry Development Kit, CDK, Molecule fragmentation, In silico fragmentation, Scaffolds, Functional groups, Glycosidic moieties, Rich client, Graphical user interface, GUI (1)
- Clustering (1)
- DECIMER (1)
- Deep Learning (1)
- Depiction generator image augmentation (1)
- Dissipative particle dynamics, DPD, Surfactant, Bilayer, Lamellar, Simulation, Mesoscopic (1)
- Electrodeposition (1)
- Electrolysis (1)
- Electromagnetic Launcher (1)
- Energy Storage Mode (1)
- Erweiterte Realität <Informatik> (1)
- Evidence-based Management (1)
- Fragmentation (1)
- Gas Diffusion Electrode (1)
- Greek dept crisis (1)
- Hand-drawn chemical structures (1)
- Homogene Kühlung (1)
- Hydraulic cell compression (1)
- Hydrogen evolution reaction (1)
- Implantat (1)
- Indigo (1)
- Kernspintomografie (1)
- Laser Synthesis Electrocatalytic Water Splitting (1)
- Leadership Competencies (1)
- Linear Electromagnetic Accelerator (1)
- Lüftungsanlage (1)
- MITRE (1)
- Magnetic Pressure (1)
- Membrane (1)
- Modular Augmented Launcher (1)
- Modular Design (1)
- Multiphase Rail Launcher (1)
- Mund-Nasen-Schutz (1)
- Muzzle Velocity (1)
- N,N,O Ligands (1)
- N,N′ Ligands (1)
- Natural products (1)
- NiCrBSi coatings; flame spraying; induction remelting; wear resistance (1)
- Normalisierung (1)
- OCSR, Optical Chemical Structure Recognition (1)
- ORR OER (1)
- OSINT (1)
- PEM electrolysis (1)
- PEM fuel cell (1)
- PEM fuel cell electrocatalysts, Carbon nanofibers, Oxygen plasma activation, Pulsed electroplating. (1)
- PEM water electrolysis (1)
- PEMWE (1)
- Physics-informed deep learning; unsupervised learning; Reynolds-averaged Navier-Stokesequations; high Reynolds number flow; turbulence modeling (1)
- Politische Berichterstattung (1)
- Porous Transport Layers (1)
- Powder feed rate HVOF Cermet Wear Corrosion (1)
- PtCoMn (1)
- RDKit (1)
- Rail Launcher (1)
- Railgun (1)
- SARS-CoV-2 (1)
- Scaffold (1)
- Scaffold network (1)
- Scaffold tree (1)
- Segmentation; Correlation; Diseases; Convolutional Neural Networks (1)
- Semi-Infinite Plate (1)
- Spondylodese (1)
- Stack <Brennstoffzelle> (1)
- Stellite 6; HVOF-spraying; Laser remelting; Cavitation erosion; Coatings (1)
- Ternary alloy catalyst preparation (1)
- Thermal Performance (1)
- Titanium; Al2O3–TiO2 coatings; Nanoindentation (1)
- Transformer (1)
- Twitter (1)
- Twitter <Softwareplattform> (1)
- Upscaling laboratory models (1)
- Zinc (1)
- academic and job-related self-control demands (1)
- additive manufacturing; polylactic acid (PLA); fused filament fabrication (FFF); fused deposition modeling (FDM); printing temperature; filament color; dimensional accuracy; tensile strength; friction performance; wear (1)
- adhesion (1)
- advanced persistent threats (1)
- aerosol (1)
- air hygiene (1)
- airborne infection (1)
- antecedents (1)
- artificial intelligence (1)
- assistive robotics (1)
- augmented reality (1)
- balance (1)
- barrel cortex, cell types, multielectrode recordings, perception, psychophysics (1)
- bio-inspired functional surface (1)
- biomimetic (1)
- bipolar plate (1)
- carbon nanofibers, platinum electrodeposition, electrocatalysts (1)
- cartilage defect (1)
- cartilage regeneration (1)
- co-based alloys; hot corrosion; solid particle erosion; microstructure; brazing (1)
- coatings (1)
- cobot (1)
- compassionate love (1)
- conical intersection (1)
- corrosion resistance (1)
- corrosion; self-fluxing alloys; NiCrBSi; WC-12Co; cavitation; hard metals (1)
- cyber kill chain (1)
- demagnetization cooling (1)
- diversity (1)
- dynamic capabilities (1)
- education; skills; competences; pandemic; online or face-to-face (1)
- efficiency of exciton transfer (1)
- empowerment (1)
- entrepreneurial diversity (1)
- entrepreneurship (1)
- ethics (1)
- excitation energy transfer (1)
- expert interviews (1)
- face mask (1)
- fused deposition modeling (FDM); fused filament fabrication (FFF); polylactic acid (PLA); layer height; layer thickness; filament color; PLA color; dimensional accuracy; tensile strength (1)
- human robot interaction (1)
- human-robot collaboration (1)
- hydraulic cell compression (1)
- international comparative study (1)
- intersectionality (1)
- irritation (1)
- machine learning (1)
- managerial vs. non-managerial actors (1)
- measurement study (1)
- media accountability (1)
- microfoundations (1)
- multi-level model of competence (1)
- narcissism (1)
- neutrality (1)
- nonadiabatic dynamics (1)
- noncommuting fluctuations (1)
- nonequilibrium quantum transport (1)
- normalisation (1)
- novel (1)
- optical chemical structure recognition (1)
- phishing (1)
- political journalism (1)
- polymer electrolyte membrane (1)
- projection (1)
- quality standards (1)
- quantum dissipation (1)
- reconnaissance (1)
- relevance (1)
- role identity (1)
- self-fluxing; ZrO2; NiCrBSi; vacuum post-treatment; thermal spraying (1)
- servant leadership (1)
- shared user control (1)
- study and working time per week (1)
- television news coverage (1)
- trait self-control (1)
- tree frog (1)
- ventilation (1)
- vibronic coupling (1)
- virtual reality (1)
- visual cues (1)
- visualization techniques (1)
- watchblogs (1)
Institut
- Westfälisches Institut für Gesundheit (38)
- Westfälisches Energieinstitut (35)
- Wirtschaft und Informationstechnik Bocholt (32)
- Elektrotechnik und angewandte Naturwissenschaften (28)
- Institut für biologische und chemische Informatik (19)
- Maschinenbau und Facilities Management (13)
- Wirtschaftsingenieurwesen (11)
- Institut Arbeit und Technik (6)
- Institut für Internetsicherheit (6)
- Maschinenbau Bocholt (6)
Design and Development of a Bioreactor System for Mechanical Stimulation of Musculoskeletal Tissue
(2023)
We report on the development of a bioreactor system for mechanical stimulation of musculoskeletal tissues. The ultimate object is to improve the quality of medical treatment following injuries of the enthesis tissue. To this end, the tissue formation process through the effect of mechanical stimulation is investigated. A six-well system was designed, 3D printed and tested. An integrated actuator creates strain by applying a force. A contactless position sensor monitors the travels. An electronic circuit controls the bioreactor using a microcontroller. An IoT platform connects the microcontroller to a smartphone, enabling the user to alter variables, trigger actions and monitor the system. The system was stabilised by implementing two PID controllers and safety measures. The results show that the bioreactor design is suited to execute mechanical stimulation and to investigate the tissue formation and regeneration process …
Cardiac and liver computed tomography (CT) perfusion has not been routinely implemented in the clinic and requires high radiation doses. The purpose of this study is to examine the radiation exposure and technical settings for cardiac and liver CT perfusion scans at different CT scanners. Two cardiac and three liver CT perfusion protocols were examined with the N1 LUNGMAN phantom at three multi-slice CT scanners: a single-source (I) and second- (II) and third-generation (III) dual-source CT scanners. Radiation doses were reported for the CT dose index (CTDIvol) and dose–length product (DLP) and a standardised DLP (DLP10cm) for cardiac and liver perfusion. The effective dose (ED10cm) for a standardised scan length of 10 cm was estimated using conversion factors based on the International Commission on Radiological Protection (ICRP) 110 phantoms and tissue-weighting factors from ICRP 103. The proposed total lifetime attributable risk of developing cancer was determined as a function of organ, age and sex for adults. Radiation exposure for CTDIvol, DLP/DLP10 cm and ED10 cm during CT perfusion was distributed as follows: for cardiac perfusion (II) 144 mGy, 1036 mGy·cm/1440 mGy·cm and 39 mSv, and (III) 28 mGy, 295 mGy·cm/279 mGy·cm and 8 mSv; for liver perfusion (I) 225 mGy, 3360 mGy·cm/2249 mGy·cm and 54 mSv, (II) 94 mGy, 1451 mGy·cm/937 mGy·cm and 22 mSv, and (III) 74 mGy, 1096 mGy·cm/739 mGy·cm and 18 mSv. The third-generation dual-source CT scanner applied the lowest doses. Proposed total lifetime attributable risk increased with decreasing age. Even though CT perfusion is a high-dose examination, we observed that new-generation CT scanners could achieve lower doses. There is a strong impact of organ, age and sex on lifetime attributable risk. Further investigations of the feasibility of these perfusion scans are required for clinical implementation.
The aim of this phantom study is to examine radiation doses of dual- and single-energy computed tomography (DECT and SECT) in the chest and upper abdomen for three different multi-slice CT scanners. A total of 34 CT protocols were examined with the phantom N1 LUNGMAN. Four different CT examination types of different anatomic regions were performed both in single- and dual-energy technique: chest, aorta, pulmonary arteries for suspected pulmonary embolism and liver. Radiation doses were examined for the CT dose index CTDIvol and dose-length product (DLP). Radiation doses of DECT were significantly higher than doses for SECT. In terms of CTDIvol, radiation doses were 1.1–3.2 times higher, and in terms of DLP, these were 1.1–3.8 times higher for DECT compared with SECT. The third-generation dual-source CT applied the lowest dose in 7 of 15 different examination types of different anatomic regions.
Among all additive manufacturing processes, Directed Energy Deposition-Arc (DED-Arc) shows significantly shorter production times and is particularly suitable for large-volume components of simple to medium complexity. To exploit the full potential of this process, the microstructural, mechanical and corrosion behavior have to be studied. High stickout distances lead to a large offset, which leads to an instable electric arc and thus defects such as lack of fusion. Since corrosion preferentially occurs at such defects, the main objective of this work is to investigate the influence of the stickout distance on the corrosion
behavior and microstructure of stainless steel manufactured by DED-Arc.
Within the heterogenous structure of the manufactured samples lack of fusion defects were detected. The quantity of such defects was reduced by applying a shorter stickout distance. The corrosion behavior of the additively manufactured specimens was investigated by means of potentiodynamic polarization measurements. The semi-logarithmic current density potential curves showed a similar course and thus similar corrosion resistance like that of the conventionally forged sample. The polarization curve of the reference material shows numerous current peaks, both in the anodic and cathodic regions. This metastable behavior is induced by the presence of manganese sulfides. On the sample surface a local attack by pitting corrosion was identified.
Three-dimensional magnetic resonance medical images may contain scanner- and patient-induced geometric distortion. For qualitative diagnosis, geometric errors of a few millimeters are often tolerated. However, quantitative applications such as image-guided neurosurgery and radiotherapy can require an accuracy of a millimeter or better. We have developed a method to accurately measure scanner-induced geometric distortion and to correct the MR images for this type of distortion. The method involves a number of steps. First, a specially designed phantom is scanned that contains a large number of reference structures on positions with a manufacturing error of less than 0.05 mm. Next, the positions of the reference structures are automatically detected in the scanned images and a higher-order polynomial distortion-correction transformation is estimated. Then the patient is scanned and the transformation is applied to correct the patient images for the detected distortion. The distortion-correction method is explained in detail in this paper. The accuracy of the method has been measured with synthetically generated phantom scans that contain an exactly-known amount and type of distortion. The reproducibility of the method has been measured by applying it to a series of consecutive phantom scans. Validation results are briefly described in this paper, a more-detailed description is given in another submission to SPIE Medical Imaging 2001.