Bibliografias temáticas / Reductive group schemes

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Literatura científica selecionada sobre o tema "Reductive group schemes"

Autor: Grafiati

Publicado: 5 de outubro de 2024

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Artigos de revistas sobre o assunto "Reductive group schemes"

Pan, Yang. "Saturation rank for finite group schemes: Finite groups and infinitesimal group schemes". Forum Mathematicum 30, n.º 2 (1 de março de 2018): 479–95. http://dx.doi.org/10.1515/forum-2017-0007.

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AbstractWe investigate the saturation rank of a finite group scheme defined over an algebraically closed field{\Bbbk}of positive characteristicp. We begin by exploring the saturation rank for finite groups and infinitesimal group schemes. Special attention is given to reductive Lie algebras and the second Frobenius kernel of the algebraic group{\operatorname{SL}_{n}}.

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González-Avilés, Cristian D. "Abelian class groups of reductive group schemes". Israel Journal of Mathematics 196, n.º 1 (agosto de 2013): 175–214. http://dx.doi.org/10.1007/s11856-012-0147-4.

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MCNINCH, GEORGE. "REDUCTIVE SUBGROUP SCHEMES OF A PARAHORIC GROUP SCHEME". Transformation Groups 25, n.º 1 (27 de novembro de 2018): 217–49. http://dx.doi.org/10.1007/s00031-018-9508-3.

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Gyoja, Akihiko. "Representations of reductive group schemes". Tsukuba Journal of Mathematics 15, n.º 2 (dezembro de 1991): 335–46. http://dx.doi.org/10.21099/tkbjm/1496161661.

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Prasad, Gopal, e Jiu-Kang Yu. "On quasi-reductive group schemes". Journal of Algebraic Geometry 15, n.º 3 (1 de setembro de 2006): 507–49. http://dx.doi.org/10.1090/s1056-3911-06-00422-x.

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Waterhouse, William C. "Geometrically reductive affine group schemes". Archiv der Mathematik 62, n.º 4 (abril de 1994): 306–7. http://dx.doi.org/10.1007/bf01201781.

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Vasiu, Adrian. "Extension theorems for reductive group schemes". Algebra & Number Theory 10, n.º 1 (14 de fevereiro de 2016): 89–115. http://dx.doi.org/10.2140/ant.2016.10.89.

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Zhao, Yifei. "Tannakian reconstruction of reductive group schemes". Pacific Journal of Mathematics 321, n.º 2 (31 de dezembro de 2022): 467–78. http://dx.doi.org/10.2140/pjm.2022.321.467.

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Stasinski, Alexander. "Reductive group schemes, the Greenberg functor, and associated algebraic groups". Journal of Pure and Applied Algebra 216, n.º 5 (maio de 2012): 1092–101. http://dx.doi.org/10.1016/j.jpaa.2011.10.027.

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CHANG, HAO, e ROLF FARNSTEINER. "Finite group schemes of p-rank ≤ 1". Mathematical Proceedings of the Cambridge Philosophical Society 166, n.º 2 (27 de novembro de 2017): 297–323. http://dx.doi.org/10.1017/s0305004117000834.

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AbstractLet be a finite group scheme over an algebraically closed field k of characteristic char(k) = p ≥ 3. In generalisation of the familiar notion from the modular representation theory of finite groups, we define the p-rank rkp() of and determine the structure of those group schemes of p-rank 1, whose linearly reductive radical is trivial. The most difficult case concerns infinitesimal groups of height 1, which correspond to restricted Lie algebras. Our results show that group schemes of p-rank ≤ 1 are closely related to those being of finite or domestic representation type.

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Mais fontes

Teses / dissertações sobre o assunto "Reductive group schemes"

Li, Shang. "An Equivariant Compactification for Adjoint Reductive Group Schemes". Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASM028.

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Les compactifications magnifiques des schémas en groupes réductifs adjoints sur un corps algébriquement clos jouent un role important dans la géométrie algébrique et la théorie des représentations.Dans cette thèse, on construit une compactification équivariante pour schémas en groupes réductifs adjoints sur schémas arbitraires. Nos compactifications paramètrent les compactifications magnifiques classiques de De Concini et Procesi en tant que fibres géométriques. Notre construction est basée sur une variante de la méthode de Artin-Weil des lois de groupes birationnelles, et, dans le cas déployé, ne dépend pas de l'existence d'une compactification magnifique classique sur un corps algébriquement clos. En particulier, notre construction donne une construction intrinsèque de compactifications magnifiques. Le schéma de groupe Picard de nos compactifications est calculé. De plus, nous discutons des différentes applications de notre compactification sur l'étude des torseurs sous schémas de groupes réductifs
Wonderful compactifications of adjoint reductive groups over an algebraically closed field play an important role in algebraic geometry and representation theory. In this thesis, we construct an equivariant com- pactification for adjoint reductive groups over arbitrary base schemes. Our compactifications parameterize classical wonderful compactifications of De Concini and Pro- cesi as geometric fibers. Our construction is based on a variant of the Artin-Weil method of birational group laws, and, in the split case, dose not depend on the existence of the classical wonderful compactification over an algebraically closed field. In particular, our construction gives a new intrinsic construction of wonderful compac- tifications. The Picard group scheme of our compactifi- cations is computed. We also discuss several applications of our compactification in the study of torsors under reductive group schemes

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Livros sobre o assunto "Reductive group schemes"

author, Pianzola Arturo 1955, ed. Torsors, reductive group schemes and extended affine lie algebras. Providence, Rhode Island: American Mathematical Society, 2013.

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Scholze, Peter, e Jared Weinstein. Berkeley Lectures on p-adic Geometry. Princeton University Press, 2020. http://dx.doi.org/10.23943/princeton/9780691202082.001.0001.

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This book presents an important breakthrough in arithmetic geometry. In 2014, this book's author delivered a series of lectures at the University of California, Berkeley, on new ideas in the theory of p-adic geometry. Building on his discovery of perfectoid spaces, the author introduced the concept of “diamonds,” which are to perfectoid spaces what algebraic spaces are to schemes. The introduction of diamonds, along with the development of a mixed-characteristic shtuka, set the stage for a critical advance in the discipline. This book shows that the moduli space of mixed-characteristic shtukas is a diamond, raising the possibility of using the cohomology of such spaces to attack the Langlands conjectures for a reductive group over a p-adic field. The book follows the informal style of the original Berkeley lectures, with one chapter per lecture. It explores p-adic and perfectoid spaces before laying out the newer theory of shtukas and their moduli spaces. Points of contact with other threads of the subject, including p-divisible groups, p-adic Hodge theory, and Rapoport-Zink spaces, are thoroughly explained.

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Capítulos de livros sobre o assunto "Reductive group schemes"

Contou-Carrère, Carlos. "Parabolic Subgroups in a Reductive Group Scheme". In Buildings and Schubert Schemes, 252–74. Boca Raton : Taylor & Francis, 2016. | “A CRC title.”: CRC Press, 2017. http://dx.doi.org/10.1201/9781315367309-11.

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Contou-Carrère, Carlos. "Minimal Generalized Galleries in a Reductive Group Building". In Buildings and Schubert Schemes, 214–51. Boca Raton : Taylor & Francis, 2016. | “A CRC title.”: CRC Press, 2017. http://dx.doi.org/10.1201/9781315367309-10.

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Abramovich, Dan, e Jonathan Lubin. "Raynaud’s group-scheme and reduction of coverings". In Number Theory, Analysis and Geometry, 1–18. Boston, MA: Springer US, 2011. http://dx.doi.org/10.1007/978-1-4614-1260-1_1.

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Rogava, Jemal, David Gulua e Romeo Galdava. "Reduction of Some Semi-discrete Schemes for an Evolutionary Equation to Two-Layer Schemes and Estimates for the Approximate Solution Error". In Lie Groups, Differential Equations, and Geometry, 223–46. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-62181-4_10.

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Sueoka, Terumi, Harumi Hikita e Setsuko Katoh. "Best-Fit Analysis of Kinetic Scheme for the Stepwise Reduction of the “Diketo” Group of 6-Pyruvoyl Tetrahydropterin by Sepiapterin Reductase". In Enzymology and Molecular Biology of Carbonyl Metabolism 3, 229–39. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-5901-2_25.

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Conrad, Brian, e Gopal Prasad. "Automorphisms, isomorphisms, and Tits classification". In Classification of Pseudo-reductive Groups (AM-191). Princeton University Press, 2015. http://dx.doi.org/10.23943/princeton/9780691167923.003.0006.

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This chapter considers automorphisms, isomorphisms, and Tits classification. It begins by establishing a version of the Isomorphism Theorem for pseudo-split pseudo-reductive groups, along with a pseudo-reductive variant of the Isogeny Theorem for split connected semisimple groups. The key to both proofs is a technique to construct pseudo-reductive subgroups of an ambient smooth affine group. Some instructive examples over imperfect fields k of characteristic 2 are given. The chapter goes on to discuss the behavior of the k-group ZG,C with respect to Weil restriction in the pseudoreductive case. It also describes automorphism schemes for pseudo-reductive groups, focusing only on the pseudo-semisimple case because commutative pseudo-reductive groups that are not tori generally have a non-representable automorphism functor. Finally, it examines Tits-style classification, using Dynkin diagrams to express the classification theorem.

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Conrad, Brian, e Gopal Prasad. "Universal smooth k-tame central extension". In Classification of Pseudo-reductive Groups (AM-191). Princeton University Press, 2015. http://dx.doi.org/10.23943/princeton/9780691167923.003.0005.

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This chapter describes the construction of canonical central extensions that are analogues for perfect smooth connected affine k-groups of the simply connected central cover of a connected semisimple k-group. A commutative affine k-group scheme of finite type is k-tame if it does not contain a nontrivial unipotent k-subgroup scheme. The chapter establishes good properties of the universal smooth k-tame central extension, noting that the property “locally of minimal type” is inherited by pseudo-reductive central quotients of pseudo-reductive groups. Although inseparable Weil restriction does not generally preserve perfectness, the chapter shows that the formation of the universal smooth k-tame central extension interacts with derived groups of Weil restrictions.

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Conrad, Brian, e Gopal Prasad. "Central extensions and groups locally of minimal type". In Classification of Pseudo-reductive Groups (AM-191). Princeton University Press, 2015. http://dx.doi.org/10.23943/princeton/9780691167923.003.0004.

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This chapter deals with central extensions and groups locally of minimal type. It begins with a discussion of the general lemma on the behavior of the scheme-theoretic center with respect to the formation of central quotient maps between pseudo-reductive groups; this lemma generalizes a familiar fact in the connected reductive case. The chapter then considers four phenomena that go beyond the quadratic case, along with a pseudo-reductive group of minimal type that is locally of minimal type. It shows that the pseudo-split absolutely pseudo-simple k-groups of minimal type with a non-reduced root system are classified over any imperfect field of characteristic 2. In this classification there is no effect if the “minimal type” hypothesis is relaxed to “locally of minimal type.”

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O’Dea, Geoff, Julian Long e Alexandra Smyth. "Types of Member Schemes". In Schemes of Arrangement: Law and Practice. Oxford University Press, 2012. http://dx.doi.org/10.1093/oso/9780199665921.003.009.

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Member schemes implemented pursuant to Part 26 of the Companies Act 2006 can be used to effect a wide variety of compromises and arrangements between a company and its shareholders. As described in Chapter 1, examples of these arrangements include: (i) the takeover of that company; (ii) a demerger of, or involving, that company; (iii) the addition of a new holding company above that company (often used to effect a corporate redomiciliation of the company’s group or to help facilitate making a capital reduction); (iv) a return of capital to shareholders of that company; (v) the removal of minority shareholders of that company; and (vi) group reorganisations combining one or more elements of (ii) to (v).

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Harder, Günter. "Harish-Chandra Modules over ℤ". In Eisenstein Cohomology for GL and the Special Values of Rankin-Selberg L-Functions, 126–67. Princeton University Press, 2019. http://dx.doi.org/10.23943/princeton/9780691197890.003.0008.

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This chapter shows that certain classes of Harish-Chandra modules have in a natural way a structure over ℤ. The Lie group is replaced by a split reductive group scheme G/ℤ, its Lie algebra is denoted by 𝖌_ℤ. On the group scheme G/ℤ there is a Cartan involution 𝚯 that acts by t ↦ t ⁻¹ on the split maximal torus. The fixed points of G/ℤ under 𝚯 is a flat group scheme 𝒦/ℤ. A Harish-Chandra module over ℤ is a ℤ-module 𝒱 that comes with an action of the Lie algebra 𝖌_ℤ, an action of the group scheme 𝒦, and some compatibility conditions is required between these two actions. Finally, 𝒦-finiteness is also required, which is that 𝒱 is a union of finitely generated ℤ modules 𝒱_I that are 𝒦-invariant. The definitions imitate the definition of a Harish-Chandra modules over ℝ or over ℂ.

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Trabalhos de conferências sobre o assunto "Reductive group schemes"

Mohd Azdi Maasar e Marlyn Anthonyrajah. "Carbon Pollution Reduction Scheme - sustainability and financial response to Rio Tinto Group". In 2011 International Conference on Business, Engineering and Industrial Applications (ICBEIA). IEEE, 2011. http://dx.doi.org/10.1109/icbeia.2011.5994254.

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Heekwang Lee, Dongyoung Kwon, Woohyun Seo, Sungsoo Park, Jemin Lee, Seungjoo Maeng, Jaeho Jeon e Daesik Hong. "User group selection scheme for lattice-reduction-aided precoder in MIMO broadcast systems". In 2010 IEEE 21st International Symposium on Personal, Indoor and Mobile Radio Communications - (PIMRC 2010). IEEE, 2010. http://dx.doi.org/10.1109/pimrc.2010.5671738.

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Wang, Geyang, David W. U. Chan, Hon Ki Tsang, Wai Ho Mow e Lian-Kuan Chen. "A 92% Complexity Reduction of Low-Latency Multi-Group Precoding Scheme based on Björck Sequences". In Optical Fiber Communication Conference. Washington, D.C.: Optica Publishing Group, 2024. http://dx.doi.org/10.1364/ofc.2024.th1e.2.

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We present a multi-group precoding scheme based on Björck sequences, achieving a tradeoff between complexity and BER performance. Experiments at ~200 Gb/s demonstrate that the proposed approach outperforms OCT while reducing complexity by 92%.

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Alhosani, Abdulla Humaid, Nasir-ud-Din Humayun e Jawahar Kannan. "Emission Capping & Trading, First of its Kind in ADNOC Group". In Abu Dhabi International Petroleum Exhibition & Conference. SPE, 2021. http://dx.doi.org/10.2118/207885-ms.

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Abstract The Spiking Gas Compressor project was installed in 2014, which reduces 65,000 tons of Carbon-di-oxide (CO2) emission annually. This was subsequently registered as a CDM (Clean Development Mechanism) project under UN convention and incidentally this was the first ADNOC project to be under this registration. The registration is the first step to claim for Carbon Credits under United Nations Framework of Clean Climate Convention (UNFCCC) scheme. No Carbon Credits were claimed under CDM since its commissioning in 2014 due to low carbon price. In 2019, we achieved the next big milestone of trading these accumulated carbon credits to an Austrian MNC. M/s MASDAR, pioneer in this field, who are also partner of ADNOC onshore in this green project, arranged an Upstream Emission Reduction (UER) buyer. The transaction is worth 65,000 tons of CO2 reduction and considerable monetary benefit. This transaction assumes significance not in terms of monetary value but a global recognition to ADNOC as a company amongst the leading players in the global arena in reducing the Greenhouse Gas (GHG) emissions. This project is the first & largest Clean Development Mechanism (CDM) registered in Oil & Gas industry in UAE. United Nations Framework Convention on Clean Climate (UNFCCC) recognized flare gas recovery through Spiking Gas Project as Clean Development Mechanism (CDM) project to generate Carbon Credits. The project demonstrates the commitment and support of Abu Dhabi Government and ADNOC towards climate change mitigation measures. Clean Development Mechanism (CDM) project demonstrated successful partnership with Masdar. The project was converted into to UER scheme. ADNOC Onshore & Masdar arranged a Buyer. Later, in compliance to ISO 14064/65, post Validation/ Verification by external auditors brought a considerable revenue to ADNOC.

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Al Mazrouei, Shayma, Dinesh Kumar Aggarwal, Suresh Ganesan e Kumaravel Ramachandran. "Leveraging Carbon Market Mechanism to Achieve De-Carbonization Targets". In ADIPEC. SPE, 2023. http://dx.doi.org/10.2118/216539-ms.

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Abstract ADNOC is committed to achieve 25% reduction of GHG emissions by 2030. The biggest challenge however remains the financial implications of implementing de-carbonization measures. Company has successfully registered one of its "36-inch 52km Pipeline Network Flare Avoidance Greenhouse Gas (GHG) Reduction Project" under the Under the European Fuel Quality Directive (FQD) Upstream Emission Reduction (UER) scheme to generate Carbon Credits, equivalent to amount of flare gas avoided. The process involved: Project identification and development of Project Design Document.Calculation of Upstream Emission Reduction based on daily volume of HP and RG gas diverted and respective calorific values,Third party validation and verification.Transaction of verified Carbon Credits in the international market. A part of the carbon credits accumulated were traded in the international market to realize carbon revenue. Success of this program complemented Company’s de-carbonization efforts as a clear demonstration of realizing the benefits GHG reduction initiatives that will help offsetting a part of de-carbonization costs, making it a win-win situation. The project supports ADNOC commitment towards achieving GHG emission reduction targets. Success of the project has been the result of remarkable collaboration between various internal and external stakeholders. This effort will stimulate others Operating Sites/Group Companies to implement similar programs, leading to a wider impact towards fighting the climate change challenge.

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Chen, Kok Hao, e Jong Hyun Choi. "DNA Oligonucleotide-Templated Nanocrystals: Synthesis and Novel Label-Free Protein Detection". In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-11958.

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Semiconductor and magnetic nanoparticles hold unique optical and magnetic properties, and great promise for bio-imaging and therapeutic applications. As part of their stable synthesis, the nanocrystal surfaces are usually capped by long chain organic moieties such as trioctylphosphine oxide. This capping serves two purposes: it saturates dangling bonds at the exposed crystalline lattice, and it prevents irreversible aggregation by stabilizing the colloid through entropic repulsion. These nanocrystals can be rendered water-soluble by either ligand exchange or overcoating, which hampers their widespread use in biological imaging and biomedical therapeutics. Here, we report a novel scheme of synthesizing fluorescent PbS and magnetic Fe3O4 nanoparticles using DNA oligonucleotides. Our method of PbS synthesis includes addition of Na2S to the mixture solution of DNA sequence and Pb acetate (at a fixed molar ratio of DNA/S2−/Pb2+ of 1:2:4) in a standard TAE buffer at room temperature in the open air. In the case of Fe3O4 particle synthesis, ferric and ferrous chloride were mixed with DNA in DI water at a molar ratio of DNA/Fe2+/Fe3+ = 1:4:8 and the particles were formed via reductive precipitation, induced by increasing pH to ∼11 with addition of ammonium hydroxide. These nanocrystals are highly stable and water-soluble immediately after the synthesis, due to DNA termination. We examined the surface chemistry between oligonucleotides and nanocrystals using FTIR spectroscopy, and found that the different chemical moieties of nucleobases passivate the particle surface. Strong coordination of primary amine and carbonyl groups provides the chemical and colloidal stabilities, leading to high particle yields (Figure 1). The resulting PbS nanocrystals have a distribution of 3–6 nm in diameter, while a broader size distribution is observed with Fe3O4 nanoparticles as shown in Figure 1b and c, respectively. A similar observation was reported with the pH change-induced Fe3O4 particles of a bimodal size distribution where superparamagnetic and ferrimagnetic magnetites co-exist. In spite of the differences, FTIR measurements suggest that the chemical nature of the oligonucleotide stabilization in this case is identical to the PbS system. As a particular application, we demonstrate that aptamer-capped PbS QD can detect a target protein based on selective charge transfer, since the oligonucleotide-templated synthesis can also serve the additional purpose of providing selective binding to a molecular target. Here, we use thrombin and a thrombin-binding aptamer as a model system. These QD have diameters of 3∼6 nm and fluoresce around 1050 nm. We find that a DNA aptamer can passivate near IR fluorescent PbS nanocrystals, rendering them water-soluble and stable against aggregation, and retain the secondary conformation needed to selectively bind to its target, thrombin, as shown in Figure 2. Importantly, we find that when the aptamer-functionalized nanoparticles binds to its target (only the target), there is a highly systematic and selective quenching of the PL, even in high concentrations of interfering proteins as shown in Figure 3a and b. Thrombin is detected within one minute with a detection limit of ∼1 nM. This PL quenching is attributed to charge transfer from functional groups on the protein to the nanocrystals. A charge transfer can suppress optical transition mechanisms as we observe a significant decrease in QD absorption with target addition (Figure 3c). Here, we rule out other possibilities including Forster resonance energy transfer (FRET) and particle aggregation, because thrombin absorb only in the UV, and we did not observe any significant change in the diffusion coefficient of the particles with the target analyte, respectively. The charge transfer-induced photobleaching of QD and carbon nanotubes was observed with amine groups, Ru-based complexes, and azobenzene compounds. This selective detection of an unlabeled protein is distinct from previously reported schemes utilizing electrochemistry, absorption, and FRET. In this scheme, the target detection by a unique, direct PL transduction is observed even in the presence of high background concentrations of interfering negatively or positively charged proteins. This mechanism is the first to selectively modulate the QD PL directly, enabling new types of label free assays and detection schemes. This direct optical transduction is possible due to oligonucleotidetemplated surface passivation and molecular recognition. This chemistry may lead to more nanoparticle-based optical and magnetic probes that can be activated in a highly chemoselective manner.

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Kinate, Bright Bariakpoa, Uchenna Daniel Elikee e Ikechi Igwe. "Injection Order: A Determinant for the Performance of Alkaline-Surfactant and Polymer Flooding Scheme". In SPE Nigeria Annual International Conference and Exhibition. SPE, 2024. http://dx.doi.org/10.2118/221755-ms.

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Abstract The combined approach of alkali, surfactant, and polymer (ASP) injection is considered the most promising and enhances oil recovery by reducing residual oil saturation and improving sweep efficiency. However, the performance of ASP flooding is highly sensitive to various factors. Among these factors, the injection order of the chemical components significantly impacts the effectiveness of the process. To optimize ASP flooding, it is essential to understand the chemical interactions and mechanisms involved in each injection order. Hence, this work will evaluate the impact of injection order on the performance of ASP flooding. Computer Modelling Group (CMG) pre-processor, Builder was used for the creation of ASP input file (dataset) and STARS module for the validation of the dataset and for prediction. Six (6) order, ASP, APS, PSA, PAS, SPA, SAP were created and each evaluated for 12years, comprising of 4 years interval for each chemical components. The cumulative oil produced, oil production rate and field oil recovery factor were determined for each order. The APS order gave the highest cumulative oil production with the SPA order having the least. Similarly, APS order gave the highest field oil recover factor with the least from SPA order. The result shows that alkali must be injected first to generate soap for interfacial tension (IFT) reduction, followed by the polymer injection to change the mobility ratio and lastly, surfactant to produce an optimal surfactant concentration to further reduce the IFT between oil and formation water to an ultra-low level.

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Akturk, Ali, e Cengiz Camci. "Tip Clearance Investigation of a Ducted Fan Used in VTOL UAVS: Part 2—Novel Treatments via Computational Design and Their Experimental Verification". In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-46359.

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Ducted fan based vertical lift systems are excellent candidates to be in the group of the next generation vertical lift vehicles, with many potential applications in general aviation and military missions. Although ducted fans provide high performance in many “Vertical Take-Off and Landing” (VTOL) applications, there are still unresolved problems associated with these systems. Fan rotor tip leakage flow adversely affects the general aerodynamic performance of ducted fan VTOL UAVs. The current study utilized a three dimensional Reynolds-Averaged Navier Stokes (RANS) based CFD model of ducted fan for the development and design analysis of novel tip treatments. Various tip leakage mitigation schemes were introduced by varying the chordwise location and the width of the extension in the circumferential direction. Reduced tip clearance related flow interactions were essential in improving the energy efficiency and range of ducted fan based vehicles. Full and inclined pressure side tip squealers were also designed. Squealer tips were effective in changing the overall trajectory of the tip vortex to a higher path in radial direction. The interaction of rotor blades and tip vortex was effectively reduced and the aerodynamic performance of the rotor blades was improved. The overall aerodynamic gain was a measurable reduction in leakage mass flow rate. This leakage reduction increased thrust significantly. Experimental measurements indicated that full and inclined pressure side tip squealers increased thrust obtained in hover condition by 9.1% and 9.6% respectively. A reduction or elimination of the momentum deficit in tip vortices is essential to reduce the adverse performance effects originating from the unsteady and highly turbulent tip leakage flows rotating against a stationary casing. The novel tip treatments developed throughout this study are highly effective in reducing the adverse performance effects of ducted fan systems developed for VTOL UAVs.

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Suwignyo, Bambang, Miftahush Shirothul Haq, Slamet Widiyanto e Siti Helmyati. "Application of Appropriate Technology for the Development of Feed Sources of Fe and Zinc as Mitigation of Reducing Stunting Prevalence in Kulon Progo". In 3rd International Conference on Community Engagement and Education for Sustainable Development. AIJR Publisher, 2023. http://dx.doi.org/10.21467/proceedings.151.13.

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Stunting is one of the priority health and nutrition problems in Indonesia. In the 2020-2024 National Medium Term Development Plan (RPJMN), the government targets the stunting rate to be 14%. The stunting rate in Indonesia using UN standards is still above 20 percent (BKKBN sources say 24.4 %). The handling of stunting cannot only target the stunting toddler group. Involving one life cycle from young women, pregnant women, and toddlers becomes a critical window in specific interventions to prevent and treat stunting. Therefore, awareness for fulfilling nutrition is an awareness that needs to be grown on a family basis. In farming families, it can be started by developing food sources and/or animal feeds with high Fe and Zn content, one of which is Tropical Alfalfa or Kacang Ratu BW as a functional feed/food source towards eradicating stunting. Program activity was the dissemination of this tropical alfalfa throughout Indonesia and one of its demonstration plots in the Mekar Farmers Group of Nglinggo, Samigaluh, through an appropriate technology scheme. The method used is learning by doing. In parallel, education on stunting was carried out. On the other hand, the community prepares feed ingredients that can be implemented in livestock to produce food/food rich in Fe and Zn. The results of the pre-test and post-test showed an increase in understanding of stunting, where before the program, 40% understood what stunting was, while the post-test results showed figures of 87-100%. Before the program, 0% knew tropical alfalfa. After the program, 93% not only knew but also planted. Massively developing feed ingredients sourced from Fe and Zn and implementing them in every family will become a solid nutritional foundation for a family-based stunting reduction mitigation pattern.

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Gao, Jinliang, Jianxun Chen, Wenyan Wu, Liqun Deng, Kunyi Li e Yi Yuan. "Leakage control of water distribution system by drop-restore pressure based on viscoelastic mechanism". In 2nd WDSA/CCWI Joint Conference. València: Editorial Universitat Politècnica de València, 2022. http://dx.doi.org/10.4995/wdsa-ccwi2022.2022.14817.

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As a common method to control leakage of water distribution system, pressure management has the advantages of reducing energy consumption, reducing the possibility of explosion and avoiding the aggravation of leakage. In recent years, with the popularization of plastic pipe in the world, it is necessary to study its leakage characteristic. Our research group carried out leakage experiments on high density polyethylene (HDPE) pipe, and found that the correlation curve between leakage flow and pressure did not completely coincide in the phase of pressure boost and pressure reduction. The existing FAVAD and exponential leakage models could not explain this phenomenon, which challenges the pressure management theory dominated by a single depressing-pressure process, thus it’s necessary to explore pressure management strategies suitable for plastic pipes. Based on the viscoelastic properties of plastic pipe, we established the viscoelastic leakage model and proposed the leakage control method of drop-restore pressure, and verified its feasibility in practical engineering case. The main research objectives of this paper will be firstly to describe the strain response of leakage area in the process of continuous stress application with the Boltzmann superposition principle for HDPE pipe; the Voigt-Kelvin model is used to simulate the creep behavior of viscoelastic material, and a suitable leakage model for viscoelastic pipe is proposed to provide accurate expression of the leakage under the regulation of drop-restore pressure. Secondly, the viscoelastic pipe leakage model is embedded into the pressure-driven analysis model based on non-iterative method, and the pressure-driven viscoelastic leakage model is obtained. Finally, evaluating the proposed leakage model in the practical case. With the minimum of leakage flow as the objective function, the leakage control model of drop-restore pressure is established and solved by particle swarm optimization algorithm to obtain the accurate pressure regulation scheme. After applying the scheme from the optimization, the leakage rate decreases from 37.7% to 16.8% on weekday, which is great impact on leakage control.

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Relatórios de organizações sobre o assunto "Reductive group schemes"

Lewis, Erin, Victoria Cohen, Charlotte Evans e Iulia Gherman. Salmonella risk profile of UK-produced hen shell eggs. Food Standards Agency, julho de 2023. http://dx.doi.org/10.46756/sci.fsa.rpp424.

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A previous risk assessment (Opens in a new window) from the Advisory Committee on the Microbiological Safety of Food (ACMSF) in 2016 concluded that due to the significant reduction in the risk from Salmonella in UK-produced hen shell eggs produced under a recognised farm assurance scheme (Lion Code or equivalent), the risk to consumers from eggs produced under these schemes was ‘very low’. This risk assessment led the FSA and FSS to update their consumer advice on the consumption of eggs in 2017, stating that vulnerable groups could consume raw or runny eggs produced within an assurance scheme. This risk profile will examine the current situation of Salmonella in UK-produced table eggs, and the factors that may influence the current risk of Salmonella in UK-produced eggs and highlight any that have changed since the risk assessment provided by the ACMSF in 2016.

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Velasques de Paula Machado, Fabiana. Does Inequality Breed Altruism or Selfishness? Gauging Individuals' Predispositions towards Redistributive Schemes. Inter-American Development Bank, janeiro de 2012. http://dx.doi.org/10.18235/0011378.

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While decreasing inequality is generally considered desirable, and there is a growing understanding of which policies do and do not promote equality, much less is known regarding why these policies are adopted to varying degrees of intensity in different times and places. To explain this variation, the constituencies for different policies under various conditions must be identified. This paper explores that question using Brazilian public opinion data on preferences regarding taxation, conditional cash transfers, pension schemes and educations. It is found that disagreement across socio-economic groups arises on how government should address inequality rather than whether it should do so. While poorer respondents support cash transfers more than the rich, the rich are more likely than the poor to support expenditures on public education. Contrary to what is commonly assumed, inequality seems to breed altruism among the rich regarding the quintessential poverty reduction scheme of conditional cash transfers.

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