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168 articles for “Rare”
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Research ArticleOpen accessEvery word in the titleProtected, Rare and Medicinal Plant Species of the Buiratau State National Natural Park (Republic of Kazakhstan)Kulpash Dakenovna Kenzhina, Almagul Kali, Gulzhazira Turlybekova et al.The State National Natural Park (SNNP) "Buiratau" is the youngest. The purpose of our study was an independent botanical and geographical survey of the vegetation cover of the SNNP "Buiratau" and a summary of the work of botanists from Kazakhstan and Russia who worked at different times in the protected area. The results showed that depending on the geographical location … …OnLine Journal of Biological Sciences, Vol. 25, Issue 2 · 30 Apr 2025 · 5,599 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleWettability and Interfacial Tension Alteration of Rare-Earth Doped Yttrium Iron Garnet under Influence of Electromagnetic WavesLau Zhen Yin, Lee Kean Chuan, Beh Hoe Guan et al.Yttrium Iron Garnet (YIG) doped with rare-earth elements have shown to alter the magnetic properties of garnet nanoparticles (NPs), which is believed to have direct influence on the wettability, interfacial tension and viscosity alteration of garnet nanofluids. In this study, Y2.8R0.2Fe5O12 (R = Lanthanum (La), Neodymium (Nd) and Samarium (Sm)) NPs were synthesized by using the sol gel auto-combustion method … …American Journal of Applied Sciences, Vol. 16, Issue 6 · 25 Jul 2019 · 7,687 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleA General Strategy to Enhance Upconversion luminescence in Rare-Earth-Ion-Doped Oxide NanocrystalsGuanying Chen, Lei XuWe report a general strategy to enhance upconversion luminescence from rare-earth-doped oxide nanocrystals through tailoring the local crystal filed around rare earth ions. We show that upconversion luminescence from oxide nanocrystals of various host lattice (Y2O3, Gd2O3 and ZnO) and of diverse rare-earth-ions (such as Er3+, Yb3+/Er3+, Yb3+/Ho3+ and Yb3+/Tm3+) was enhanced by orders of magnitude through an introduction of … …American Journal of Engineering and Applied Sciences, Vol. 9, Issue 1 · 18 Feb 2016 · 7,741 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleMining Rare Itemset with Automated Support ThresholdsKanimozhi Selvi Chenniangirivalsu Sadhasivam, Tamilarasi AngamuthuProblem statement: Frequent itemset mining is an important task in data mining to discover the hidden, interesting associations between items in the database based on the user-specified support and confidence thresholds. Approach: In order to find important associations, an appropriate support threshold has to be specified. The support threshold plays a key role in deciding the interesting itemsets. The rare … …Journal of Computer Science, Vol. 7, Issue 3 · 7 Mar 2011 · 6,847 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleRare Earth Elements and Geochemical Partitioning of Zn and Pb in Sediments of an Urban RiverShaila Sharmin, H. M. Zakir, Naotatsu ShikazonoProblem statement: Urban river sediment pollution due to Zn and Pb is a serious problem in all over the world. The source and level of Zn and Pb pollution in sediments of Nomi River of Ota Ward, one of the most industrialized areas in Tokyo, Japan is still lacking. Approach: The present study focused on Rare Earth Elements (REEs) and … …American Journal of Environmental Sciences, Vol. 6, Issue 5 · 31 Oct 2010 · 6,969 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleRarefied Gas Flow Modeling inside Rotating Circular CylinderN. PourmahmoudIn this study a rarefied gas flow inside a rotating circular cylinder by means of direct simulation Monte Carlo (DSMC) method is investigated. A rarefied gas is supposed to be contained in a cylindrical domain, bonded by a rotational cylinder with smooth and diffuse-reflection surface. The top and bottom ends of domain is assumed to be speculary-reflecting. Special attention is … …American Journal of Engineering and Applied Sciences, Vol. 1, Issue 1 · 31 Mar 2008 · 7,455 accessesView PDFCite
Review ArticleOpen accessEvery word in the titleAn Insight into Rare Class Problem: Analysis and Potential SolutionsSatyam Maheshwari, R.C. Jain, R.S. JadonThe class imbalance problem presents an important challenge to the data mining community, in which the number of examples of one class is more than the others. This problem is characterized by a different distribution of cases between all the classes. In this paper, our goal is to study the various challenges of class imbalance problem and provide a comparative … …Journal of Computer Science, Vol. 14, Issue 6 · 9 May 2018 · 8,393 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleCollection and Processing of Medicinal Raw Materials from Some Rare Plants in the Forest-Steppe Zone of Northern KazakhstanMarat Tynykulov, Svetlana Derbush, Marina Kuznetsova et al.Rare endemic plants of the forest-steppe zone of Northern Kazakhstan, including Adonis vernalis, Adonis wolgensis, Pulsatilla patens, and Pulsatilla multifida, represent valuable medicinal resources whose sustainable utilization requires optimized harvesting, processing, and conservation strategies. This study evaluated the effects of drying conditions, environmental factors, extraction techniques, and biotechnological approaches on the yield and quality of bioactive compounds from these species. … …OnLine Journal of Biological Sciences, Vol. 26, Issue 1 · 1 Apr 2026 · 1,601 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleCurrent State of a Rare, Narrowly Endemic Plant of the Flora of Kazakhstan, Rosa Potentilliflora Chrshan. et M. Pop. (Rosaceae) in Low-Mountain SyugatyChinargul Aldassugurova, Abibulla Ametov, Akmaral Nurmahanova, Aigul AkhmetovaThis study provides a comprehensive ecological assessment of Rosa potentilliflora, a rare and narrowly endemic species of the Kazakh flora, occurring exclusively in the Syugaty low-mountain range at the eastern edge of the Zailiyskiy Alatau. The species occupies southeast-facing rocky slopes within steppe vegetation belts. Three distinct cenopopulations were identified and studied using standard geobotanical and demographic methods. Within these … …OnLine Journal of Biological Sciences, Vol. 25, Issue 3 · 27 Nov 2025 · 2,025 accessesView PDFCite
Case ReportOpen accessEvery word in the titleThe Difficulties of Diagnosing a Rare Entity in a Common SituationManel Maymí Ballesteros, Toni Soriano Colomé et al.Acute purulent pericarditis is rare and more prevalent in the pre-antibiotic era with high mortality, around 40% despite optimal treatment. The diagnosis can be difficult, requiring the practice of a pericardiocentesis in cases with a high index of suspicion. When such a rare entity coincides with another one more frequently the diagnosis can become tricky. We present the case of … …American Journal of Infectious Diseases, Vol. 19, Issue 2 · 7 Apr 2023 · 5,406 accessesView PDFCite