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• Pub. Date : 2025
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When maneuvering a nuclear power plant of nuclear icebreakers in the Arctic ice, a functional separation of the power produced by the reactor unit with the power of the electric propulsion system is implemented, which is associated with the formation of an operational reserve of power for maneuvering. Due to the lack of clear regulation of the optimal operational reserve of maneuvering power, the choice of its value is random, which depends on the intuitive opinion of the skipper and the experience of the skipper. Overestimating the operational capacity for maneuvering increases the intensity of nuclear fuel burnout on this particular segment of the nuclear icebreaker's journey. From the point of view of the atomic mechanical service of a nuclear icebreaker, the reactor power requested by the skipper should be minimized, however, this contradicts the requirement of the skippers, who require an increased operational reserve of power for maneuver safety. To smooth out this contradiction, it is proposed to use sliding steam pressure in the main steam pipeline for short-term maneuvers of nuclear icebreakers. It is noted that the sliding steam pressure in the steam pipeline is already used at thermal power plants, thermal power plants and nuclear power plants, while various tasks are being solved, including saving fuel, increasing equipment reliability, etc. Nuclear icebreakers solve a specific task to reduce the burnout of nuclear fuel during maneuvering by minimizing the operational reserve of maneuvering power, which determines the number of removable cores in the reactor, which is the most expensive part for a nuclear icebreaker to replace. The methodological aspects of the application of sliding steam pressure in the main steam pipeline are considered and a method for estimating the effects obtained for a short-term increase in the power of the rowing electric installation is developed. The calculations were performed for the nuclear icebreaker project 10521. It is indicated that the proposed estimation methodology can be used for any other nuclear-powered vessel projects.

• Book : 2025(1)
• Pub. Date : 2025
• Page : pp.70-80
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Objectives: To evaluate the factors that influence the survival of dental implants and marginal bone loss (MBL) in patients taking osteoporosis or osteopenia medication. Materials and Methods: This study included patients who underwent dental implant treatment after taking medication for osteoporosis or osteopenia. Electronic medical records were used to collect data of patient age, sex, age at osteoporosis or osteopenia diagnosis, types of medications, age at medication initiation, duration of medication before implant surgery, whether the medication was paused before surgery, paused duration of medication, implant survival status, and MBL before and after prosthetic treatment. Firth’s logistic regression was used to analyze the relationships between each variable and implant survival as well as between MBL before and after prosthetic treatment. Results: Of the 267 patients, 111 with 209 implants were included in the study. The mean observation period was 57.9 months. The survival rate was 92.8% at the patient level and 96.2% at the implant level. No significant associations were found between implant survival and any of the variables examined. MBL before prosthetic treatment was significantly associated with use of receptor activator of nuclear factor-κB ligand (RANKL) inhibitors (P=0.032) and bone formation stimulators (P=0.022). Comparing the concurrent and single use of bisphosphonates and RANKL inhibitors, only the use of RANKL inhibitors alone was significantly associated with MBL before prosthetic treatment (P=0.039). MBL after prosthetic treatment was significantly associated with injection method among the routes of drug administration (P=0.011). Conclusion: The implant survival rate in patients undergoing medical treatment for osteoporosis or osteopenia was comparable to the general implant survival rate. MBL before prosthetic treatment was associated with type of anti-osteoporotic medication, whereas MBL after prosthetic treatment was correlated with drug administration route. Further studies with larger sample sizes are required.

• Book : 51(1)
• Pub. Date : 2025
• Page : pp.17-25
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• Page : pp.170209-170209
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• Pub. Date : 2025
• Page : pp.100910-100910
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• Pub. Date : 2025
• Page : pp.101714-101714
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