40 research outputs found
Vanadium States in Doped Bi12SiO20
Full text linkWe have investigated the absorption of the V doped Bi12SiO20 in the spectral region 1.45-2 eV (11 696 – 16 129 cm-1). The observed absorption bands are due to the V2+, V3+ and V4+ ions in the same spectral region. These absorption bands do not contain information about the exact energy position of the vanadium levels. Therefore, we have calculated the second derivative of absorption. It is established that all vanadium ions are surrounded by distorted tetrahedral coordination in Bi12SiO20 (BSO). The energy level structures of the vanadium ions in BSO are also presented. We have calculated the field parameters Dq and the Racah parameters B and C for V2+ ion. We have determined the field parameters Dq, Ds and Dt for V3+ ion.DOI: http://dx.doi.org/10.5755/j01.ms.21.2.6140</p
ChemInform Abstract: Bifunctionalized Allenes. Part 9. An Efficient Method for Regioselective Synthesis of 4‐Heteroatom‐Functionalized Allenecarboxylates.
No full textChemInform Abstract: Bifunctionalized Allenes. Part 11. Competitive Electrophilic Cyclization and Addition Reactions of 4‐Phosphorylated Allenecarboxylates.
No full textPotential applications of calcium pyrophosphate for bone regenerative therapy: A systematic review
No full textCalcium phosphate bioceramics such as hydroxyapatite and beta tricalcium phosphate are among the most commonly used biomaterials in bone regenerative therapy. In search of their analogues, the potential for the use of calcium pyrophosphate in this area has been investigated
Histomorphometric Analysis of Osseointegrated Intraosseous Dental Implants Using Undecalcified Specimens: A Scoping Review
No full textBone histology and histomorphometry are reliable diagnostic tools for the assessment of the bone–implant interface, material safety and biocompatibility, and tissue response. They allow for the qualitative and quantitative analysis of undecalcified bone specimens. This scoping review aims to identify the most common staining techniques, study models for in vivo experiments, and histomorphometric parameters used for quantitative bone evaluation of osseointegrated dental implants in the last decade. The Web of Science, PubMed, and Scopus databases were searched on 1 July 2024 for relevant articles in English, published in the last ten years, and the data were exported to an MS Excel spreadsheet. A total of 115 studies met the eligibility criteria and were included in the present review. The results indicate that the most common study models are dogs, rabbits, and pigs. Some of the most frequently used methods for the assessment of the bone–implant interface are the Toluidine blue, Stevenel’s blue with Van Gieson, and Levai–Laczko stainings. The results from this study demonstrate that the most commonly used histomorphometric parameters in implant dentistry are the bone-to-implant contact (BIC), bone area fraction occupancy (BAFO), bone area (BA), and bone density (BD). This review presents the recent trends in histomorphometric analysis of dental implants and identifies some research gaps that necessitate further research
A Modified Protocol for Staining of Undecalcified Bone Samples Using Toluidine Blue—A Histological Study in Rabbit Models
No full textUndecalcified bone histology is a valuable diagnostic method for studying bone microarchitecture and provides information on bone formation, resorption, and turnover. It has various clinical and research applications. Toluidine blue has been widely adopted as a staining technique for hard-tissue specimens. It provides a clear identification of bone structural and cellular features and the distinctions between them. Furthermore, the method allows for an excellent definition of the cement lines that mark the fields of bone remodeling. Some of the suggested and currently used processing and staining protocols are too complex and time-consuming, which necessitates their modification and/or optimization. This research aims to develop a simplified protocol for staining plastic-embedded undecalcified bone specimens with toluidine blue. The samples were obtained from the tibial bones of rabbits, and experiments with and without pre-etching were conducted. Our results demonstrated that the optimal visualization of the bone microstructure and its cellular components was achieved in the samples without acid pre-etching and dehydration after staining
Histomorphometric Analysis of Osseointegrated Intraosseous Dental Implants Using Undecalcified Specimens: A Scoping Review
No full textBone histology and histomorphometry are reliable diagnostic tools for the assessment of the bone–implant interface, material safety and biocompatibility, and the tissue response. They allow for the qualitative and quantitative analysis of undecalcified bone speci-mens. This scoping review focuses on the histomorphometric evaluation of osseointegrated intraosseous dental implants using plastic-embedded bone specimens. It summarizes the current knowledge regarding the appropriate staining techniques, the animal models used for in vivo experiments, and the histomorphometric parameters that allow for quantitative bone evaluation and can serve as markers of implant stability, bone formation, and osseointegration
Bifunctionalized Allenes. Part XII. Electrophilic Cyclization and Addition Reactions of 4-Sulfinylated or 4-Sulfonylated Allenecarboxylates
No full text<div><p>GRAPHICAL ABSTRACT</p><p></p></div
Traffic efficient control of a water irrigation system
No full textWater scarcity is a persistent global issue that requires effective solutions. One increasingly popular approach to address the distribution of freshwater in different regions is the utilization of Water Irrigation Systems (WIS). Due to their vital role in ensuring people's well-being, it is crucial to design a reliable infrastructure that can maintain water levels in channels as close as possible to predefined reference points.Extensive research papers have been dedicated to discussing various aspects of WIS control, modeling, and identification. Although simulations can yield valuable insights, it is essential to validate the results in real-life systems due to certain factors that cannot be precisely estimated, such as leakages along the channels. To address this need, a scaled-down version of a WIS at TU Delft has been developed, which effectively emulates the behavior of a real water irrigation system. Through continuous refinement and design enhancements, the simulator has proven to be a valuable tool.Working with the scaled-down WIS has presented significant challenges, but a dedicated controller has been developed, yielding satisfactory results. The approach to controlling the WIS is simple yet effective, employing a decentralized controller that is applied to both the nonlinear simulator and the real setup. Remarkably, this approach successfully meets the predefined reference points, even in the face of applied disturbances to the system.Mechanical Engineerin
Adding Redundancy To Splitting Protocols for a Better Performance
No full textPayment Channel Networks have been developed to deal with the scalability issue in blockchain technologies. Using them, two parties can make multiple payments between themselves relatively fast. However, usually the channels have too small capacities, unable to handle a big payment. Allowing to split a payment into smaller payments and forwarding them through different intermediaries is a way to solve this issue, but a party only knows the capacities of the channels it is connected to. Therefore, it is possible for a payment to be sent to an intermediary which would not have sufficient funds to forward it to another node, closer to the receiver. Making redundant transactions in order to further improve the payment success ratio is a way to handle this drawback. This paper provides 3 algorithms for adding redundancy to the already existing splitting protocol. The evaluation shows that all of them improve the success ratio, but at the price of parties exchanging more messages.CSE3000 Research ProjectComputer Science and Engineerin
