SOME SPECIAL CURVES BELONGING TO MANNHEIM CURVES PAIR

In this paper, we investigate special Smarandache curves with regard to Sabban frame for Mannheim partner curve spherical indicatrix. We created Sabban frame belonging to this curves. It was explained Smarandache curves position vector is consisted by Sabban vectors belonging to this curves. Then, we calculated geodesic curvatures of this Smarandache curves. Found results were expressed depending on the Mannheim curve

The effect of sulfonate and phosphate anionic monomers of water reducing admixtures on fresh state and mechanical properties of self compacting concrete

Bu çalışmada, polikarboksilat-eter esaslı su azaltıcı katkının anyonik monomer içeriğinin kendiliğinden yerleşebilen beton (KYB) karışımlarının çeşitli taze ve sertleşmiş hal özelliklerine etkisi araştırılmıştır. Bu amaçla, anyonik monomeri %100 karboksilat olan kontrol katkısına ilaveten, kontrol katkısının anyonik monomerinin %10 ve %30 oranında sülfonat ve fosfat ile ikame edilmesiyle birbirinden farklı 5 adet su azaltıcı katkı sentezlenmiştir. Elde edilen sonuçlara göre, su azaltıcı katkı anyonik monomerinin sülfonat ile ikame edilmesi, karışımların katkı ihtiyacını artırırken; zamana bağlı yayılma performanslarını olumlu yönde etkilemiştir. Fosfat ikame edilmesi durumunda ise karışımların katkı ihtiyacı azalırken zamana bağlı yayılma performansı olumsuz etkilenmiştir. Tüm karışımlar içerisinde taze hal özellikleri açısından en iyi performans %10 sülfonat ikame edilen katkı ile elde edilmiştir. Anyonik monomer değişimi, KYB karışımlarının basınç dayanımları, su emme oranları, ultrases geçiş hızları (UPV) ve dinamik elastisite modüllerinde önemli bir değişikliğe sebep olmamıştır.In this study, the effect of anionic monomer content of polycarboxylate-ether based water reducing admixture on various fresh and hardened state properties of self-compacting concrete (SCC) mixtures was investigated. For this purpose, in addition to the control admixture whose anionic monomer is 100% carboxylate, 5 different water reducing admixtures were synthesized by replacing the anionic monomer of the control admixture with 10% and 30% sulfonate and phosphate. According to the results, the substitution of the water reducing admixture anionic monomer with sulfonate increases the admixture requirement of the mixtures; had a positive effect on time-dependent flowing performances. In the case of phosphate substitution, the admixture requirement of the mixtures decreased, while the time-dependent flowing performance was adversely affected. The best performance among all mixtures was obtained with 10% sulfonate substituted admixture. The anionic monomer change did not cause any significant changes in the compressive strength, water absorption rates, ultrasonic pulse velocity (UPV) and dynamic elasticity modules of the SCC mixtures.Yazarlar ayrıca çimento, agrega ve su azaltıcı katkının sağlanmasında ve özelliklerinin belirlenmesinde desteklerinden dolayı Bursa-Beton Hazır Beton ve Polisan Yapı Kimyasalları A.Ş yetkililerine teşekkür eder

Reducing the environmental impact of surgery on a global scale: systematic review and co-prioritization with healthcare workers in 132 countries

Background Healthcare cannot achieve net-zero carbon without addressing operating theatres. The aim of this study was to prioritize feasible interventions to reduce the environmental impact of operating theatres. Methods This study adopted a four-phase Delphi consensus co-prioritization methodology. In phase 1, a systematic review of published interventions and global consultation of perioperative healthcare professionals were used to longlist interventions. In phase 2, iterative thematic analysis consolidated comparable interventions into a shortlist. In phase 3, the shortlist was co-prioritized based on patient and clinician views on acceptability, feasibility, and safety. In phase 4, ranked lists of interventions were presented by their relevance to high-income countries and low–middle-income countries. Results In phase 1, 43 interventions were identified, which had low uptake in practice according to 3042 professionals globally. In phase 2, a shortlist of 15 intervention domains was generated. In phase 3, interventions were deemed acceptable for more than 90 per cent of patients except for reducing general anaesthesia (84 per cent) and re-sterilization of ‘single-use’ consumables (86 per cent). In phase 4, the top three shortlisted interventions for high-income countries were: introducing recycling; reducing use of anaesthetic gases; and appropriate clinical waste processing. In phase 4, the top three shortlisted interventions for low–middle-income countries were: introducing reusable surgical devices; reducing use of consumables; and reducing the use of general anaesthesia. Conclusion This is a step toward environmentally sustainable operating environments with actionable interventions applicable to both high– and low–middle–income countries

Reducing the environmental impact of surgery on a global scale: systematic review and co-prioritization with healthcare workers in 132 countries

Abstract Background Healthcare cannot achieve net-zero carbon without addressing operating theatres. The aim of this study was to prioritize feasible interventions to reduce the environmental impact of operating theatres. Methods This study adopted a four-phase Delphi consensus co-prioritization methodology. In phase 1, a systematic review of published interventions and global consultation of perioperative healthcare professionals were used to longlist interventions. In phase 2, iterative thematic analysis consolidated comparable interventions into a shortlist. In phase 3, the shortlist was co-prioritized based on patient and clinician views on acceptability, feasibility, and safety. In phase 4, ranked lists of interventions were presented by their relevance to high-income countries and low–middle-income countries. Results In phase 1, 43 interventions were identified, which had low uptake in practice according to 3042 professionals globally. In phase 2, a shortlist of 15 intervention domains was generated. In phase 3, interventions were deemed acceptable for more than 90 per cent of patients except for reducing general anaesthesia (84 per cent) and re-sterilization of ‘single-use’ consumables (86 per cent). In phase 4, the top three shortlisted interventions for high-income countries were: introducing recycling; reducing use of anaesthetic gases; and appropriate clinical waste processing. In phase 4, the top three shortlisted interventions for low–middle-income countries were: introducing reusable surgical devices; reducing use of consumables; and reducing the use of general anaesthesia. Conclusion This is a step toward environmentally sustainable operating environments with actionable interventions applicable to both high– and low–middle–income countries

Protective effects of melatonin and omega-3 on the hippocampus and the cerebellum of adult Wistar albino rats exposed to electromagnetic fields

The purpose of the study was to investigate the effects of pulsed digital electromagnetic radiation emitted by mobile phones on the central nervous system of the adult Wistar albino rats. The study evaluated structural and functional impacts of four treatment arms: electromagnetic field (EMF) exposed; EMF exposed + melatonin treated group (EMF + Mel); EMF exposed + omega-3 (ω3) treated group (EMF + ω3); and control group (Cont). The 12-weeks-old rats were exposed to 900 MHz EMF for 60 min/day (4:00–5:00 p.m.) for 15 days. Stereological, biochemical and electrophysiological techniques were applied to evaluate protective effects of Mel and ω3. Significant cell loss in the CA1 and CA2 regions of hippocampus were observed in the EMF compared to other groups (p 0.05). The passive avoidance test showed that entrance latency into the dark compartment was significantly shorter in the EMF (p < 0.05). Additionally, EMF had a higher serum enzyme activity than the other groups (p < 0.01). In conclusion, our analyses confirm that EMF may lead to cellular damage in the hippocampus and the cerebellum, and that Mel and ω3 may have neuroprotective effects

Uzaysal Kuaterniyonik Bertrand Eğri Çiftinin Frenet Çatısına Göre n₁^*w^* - Smarandache Eğrisi

$(\gamma, \gamma^{\ast})$ uzaysal kuaterniyonik Bertrand eğri çifti verildiğinde $\gamma^{\ast}$ eğrisine ait Frenet vektörlerinin hareketine bağlı olarak oluşan $w^{\ast}$ birim Darboux vektörü ile $n_{1}^{\ast}$ aslinormal vektörü konum vektörü olarak alındığında bu vektörün çizdiği \beta=\frac{1}{\sqrt{2} (w^{\ast}+n_{1}^{\ast}) Smarandache eğrisinin, Frenet vektörleri, eğriliği ve burulması hesaplandı. Daha sonra bulunan bu eğrilik ve burulma uzaysal kuaterniyonik Bertrand eğrisine bağlı olarak ifade edildi. Konuya örnek verilip Maple programıyla çizimi yapıldı

Morphological evidence for the potential protective effects of curcumin and Garcinia kola against diabetes in the rat hippocampus

This research article was published by Research Square, 2024This research investigated the effects of sciatic nerve transection and diabetes on the hippocampus, and the protective effects of Garcinia kola and curcumin. Thirty-five adult male Wistar albino rats were divided into five groups: a control group (Cont), a transected group (Sham group), a transected + diabetes mellitus group (DM), a transected + diabetes mellitus + Garcinia kola group (DM + GK), and a transected + DM + curcumin group (DM + Cur), each containing seven animals. The experimental diabetes model was created with the intraperitoneal injection of a single dose of streptozotocin. No procedure was applied to the Cont group, while sciatic nerve transection was performed on the other groups. Garcinia kola was administered to the rats in DM + GK, and curcumin to those in DM + Cur. Cardiac perfusion was performed at the end of the experimental period. Brain tissues were dissected for stereological, histopathological, and immunohistochemical evaluations. The volume ratios of hippocampal layers to the entire hippocampus volume were compared between the groups. Anti-S100, anti-caspase 3, and anti-SOX 2 antibodies were used for immunohistochemical analysis. No statistically significant difference was observed in the volume ratios of the four hippocampal layers. However, the volume ratio of the stratum lucidum was higher in the Sham, DM, and DM + Cur groups compared to the Cont group. While curcumin exhibited a protective effect on hippocampal tissue following diabetes induction, Garcinia kola had only a weak protective effect. Increased cell density and nuclear deterioration due to diabetes and nerve transection can be partially ameliorated by treatment with Garcinia kola and curcumi