It looks like this is a web page, not a feed. I looked for a feed associated with this page, but couldn't find one. Please enter the address of your feed to validate.

Source: https://blog-247829357775.gifthub.news/post/4310795628

  1. <!doctype html>
  2. <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en" prefix="og: http://ogp.me/ns#">
  3.  
  4.  <head>
  5.    <meta charset="utf-8">
  6.    <meta name="applicable-device" content="pc,mobile">
  7.    <meta name="viewport" content="width=device-width, initial-scale=1">
  8.    <title>Simulating Fluid Dynamics in Resource-Constrained Mobile Game Engines #084172597359 (2025-02-04)</title>
  9.    <link rel="canonical" href="https://blog-247829357775.gifthub.news/post/4310795628">
  10.    <link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Poppins:wght@400;700&display=swap">
  11.    <link rel="stylesheet" href="https://x.gifthub.news/static/css/style.css">
  12.    <script src="https://x.gifthub.news/static/js/lazysizes.min.js" async></script>
  13.    <link rel="shortcut icon" href="/favicon.ico">
  14.    <!-- Open Graph Metadata -->
  15.    <meta property="og:type" content="article" />
  16.    <meta property="og:title" content="Simulating Fluid Dynamics in Resource-Constrained Mobile Game Engines" />
  17.    <meta property="og:description" content="Simulating Fluid Dynamics in Resource-Constrained Mobile Game Engines #084172597359 (2025-02-04)" />
  18.    <meta property="og:url" content="https://blog-247829357775.gifthub.news/post/4310795628" />
  19.    <meta property="og:site_name" content="gifthub.news" />
  20.    <meta property="og:image" content="https://x.gifthub.news/static/images/post/17.jpg" />
  21.    <meta property="og:article:published_time" content="2025-02-04T00:55:08Z" />
  22.    <meta property="og:article:author" content="Dr. Patricia Brown" />
  23.    <meta property="og:article:section" content="gifthub.news" />
  24.    <meta property="og:article:tag" content="Games, Mobile Games, Video Games" />
  25.    <!-- Schema.org -->
  26.    <script type="application/ld+json">{
  27.            "@context": "https://schema.org",
  28.            "@type": "ScholarlyArticle",
  29.            "headline": "Simulating Fluid Dynamics in Resource-Constrained Mobile Game Engines #084172597359 (2025-02-04)",
  30.            "author": {
  31.                "@type": "Person",
  32.                "name": "Dr. Patricia Brown",
  33.                "affiliation": {
  34.                    "@type": "Organization",
  35.                    "name": "gifthub.news"
  36.                },
  37.                "url": "https://blog-247829357775.gifthub.news/post/4310795628"
  38.            },
  39.            "datePublished": "2025-02-04T00:55:08Z",
  40.            "image": "https://x.gifthub.news/static/images/post/17.jpg",
  41.            "journal": {
  42.                "@type": "Periodical",
  43.                "name": "gifthub.news",
  44.                "issn": "10.1069/084172597359"
  45.            },
  46.            "publisher": {
  47.                "@type": "Organization",
  48.                "name": "gifthub.news",
  49.                "url": "https://blog-247829357775.gifthub.news"
  50.            },
  51.            "doi": "084172597359",
  52.            "abstract": "Simulating Fluid Dynamics in Resource-Constrained Mobile Game Engines #084172597359 (2025-02-04)",
  53.            "citation": {
  54.                "@type": "CreativeWork",
  55.                "name": "Simulating Fluid Dynamics in Resource-Constrained Mobile Game Engines",
  56.                "author": "Dr. Patricia Brown",
  57.                "datePublished": "2025-02-04T00:55:08Z",
  58.                "url": "https://blog-247829357775.gifthub.news/post/4310795628"
  59.            }
  60.        }
  61.    </script>
  62. </head>
  63.  
  64. <body>
  65.    <div class="site-mobile-menu site-navbar-target">
  66.        <div class="site-mobile-menu-header">
  67.            <div class="site-mobile-menu-close">
  68.                <span class="icofont-close js-menu-toggle"></span>
  69.            </div>
  70.        </div>
  71.        <div class="site-mobile-menu-body"></div>
  72.    </div>
  73.    <nav class="site-nav">
  74.        <div class="container">
  75.            <div class="site-navigation">
  76.                <div class="row">
  77.                    <div class="col-md-6 text-center order-1 order-md-2 mb-3 mb-md-0">
  78.                        <a href="https://blog-247829357775.gifthub.news" class="logo m-0 text-uppercase">gifthub.news</a>
  79.                    </div>
  80.                    <div class="col-md-3 order-3 order-md-1">
  81.                    </div>
  82.                </div>
  83.            </div>
  84.        </div>
  85.    </nav>
  86.    <div class="section post-section pt-5">
  87.        <div class="container">
  88.            <div class="row justify-content-center">
  89.                <div class="col-lg-8">
  90.                    <div class="text-center">
  91.                        <img src="https://x.gifthub.news/static/images/user/7.jpg" alt="Simulating Fluid Dynamics in Resource-Constrained Mobile Game Engines" title="Simulating Fluid Dynamics in Resource-Constrained Mobile Game Engines" class="author-pic img-fluid rounded-circle mx-auto">
  92.                    </div>
  93.                    <span class="d-block text-center">Patricia Brown</span>
  94.                    <span class="date d-block text-center small text-uppercase text-black-50 mb-5">2025-02-04</span>
  95.                    <h2 class="heading text-center">Simulating Fluid Dynamics in Resource-Constrained Mobile Game Engines</h2>
  96.                    <p class="lead mb-4 text-center">Thanks to Patricia Brown for contributing the article "Simulating Fluid Dynamics in Resource-Constrained Mobile Game Engines".
  97.                    </p>
  98.                    <img src="https://x.gifthub.news/static/images/post/17.jpg" alt="Simulating Fluid Dynamics in Resource-Constrained Mobile Game Engines" title="Simulating Fluid Dynamics in Resource-Constrained Mobile Game Engines" class="img-fluid rounded mb-4 lazyload">
  99.                    <p>This paper explores the use of mobile games as educational tools, assessing their effectiveness in teaching various subjects and skills. It discusses the advantages and limitations of game-based learning in mobile contexts.</p>
  100. <p>This study examines how engaging with mobile games affects attention span and cognitive control processes. It investigates both the potential benefits, such as improved focus, and the risks, such as attention deficits.This paper analyzes the development and diversification of mobile game genres over time, highlighting key trends and innovative game mechanics. It discusses how these changes reflect technological advancements and shifting player preferences.</p>
  101. <p>This study leverages mobile game analytics and predictive modeling techniques to explore how player behavior data can be used to enhance monetization strategies and retention rates. The research employs machine learning algorithms to analyze patterns in player interactions, purchase behaviors, and in-game progression, with the goal of forecasting player lifetime value and identifying factors contributing to player churn. The paper offers insights into how game developers can optimize their revenue models through targeted in-game offers, personalized content, and adaptive difficulty settings, while also discussing the ethical implications of data collection and algorithmic decision-making in the gaming industry.</p>
  102. <p>The gaming industry's commercial landscape is fiercely competitive, with companies employing diverse monetization strategies such as microtransactions, downloadable content (DLC), and subscription models to sustain and grow their player bases. Balancing player engagement with revenue generation is a delicate dance that requires thoughtful design and consideration of player feedback.</p>
  103. <p>Mobile gaming has democratized access to gaming experiences, empowering billions of smartphone users to dive into a vast array of games ranging from casual puzzles to graphically intensive adventures. The portability and convenience of mobile devices have transformed downtime into playtime, allowing gamers to indulge their passion anytime, anywhere, with a tap of their fingertips.</p>
  104.  
  105.                    <p>
  106.                    <a href="/redirect/?url=https://blog-247829357775.gifthub.news/post/4310795628" target="_blank" class="custom-link">Link</a>
  107.                    </p>
  108.                    <p><a href="https://www.linegames.org/" target="_blank" class="custom-link">External link</a>
  109. <a href="https://www.iliiili.com/" target="_blank" class="custom-link">External link</a>
  110. <a href="https://www.digwow.net/" target="_blank" class="custom-link">External link</a>
  111. <a href="https://www.free-giftcodes.com/" target="_blank" class="custom-link">External link</a>
  112. <a href="https://www.gifthub.com.ru/" target="_blank" class="custom-link">External link</a>
  113. <a href="https://975665227797-edu.iliiili.com/" target="_blank" class="custom-link">External link</a>
  114. <a href="https://850859305501-edu.digwow.net/" target="_blank" class="custom-link">External link</a>
  115. <a href="https://529858755311-edu.free-giftcodes.com/" target="_blank" class="custom-link">External link</a>
  116. <a href="https://844523308483-edu.gifthub.com.ru/" target="_blank" class="custom-link">External link</a>
  117. <a href="https://424085137112-gov.iliiili.com/" target="_blank" class="custom-link">External link</a>
  118. <a href="https://998420604066-gov.digwow.net/" target="_blank" class="custom-link">External link</a>
  119. <a href="https://307245698096-gov.free-giftcodes.com/" target="_blank" class="custom-link">External link</a>
  120. <a href="https://619321610562-gov.gifthub.com.ru/" target="_blank" class="custom-link">External link</a>
  121. <a href="https://523039679394-gov-edu.iliiili.com/" target="_blank" class="custom-link">External link</a>
  122. <a href="https://954763434367-gov-edu.digwow.net/" target="_blank" class="custom-link">External link</a>
  123. <a href="https://438584747040-gov-edu.free-giftcodes.com/" target="_blank" class="custom-link">External link</a>
  124. <a href="https://008047443920-gov-edu.gifthub.com.ru/" target="_blank" class="custom-link">External link</a>
  125. <a href="https://363800544302-edu.iliiili.com/?url=https://blog-247829357775.gifthub.news/post/4310795628" target="_blank" class="custom-link">External link</a>
  126. <a href="https://876680781596-edu.digwow.net/?url=https://blog-247829357775.gifthub.news/post/4310795628" target="_blank" class="custom-link">External link</a>
  127. <a href="https://340732769149-edu.free-giftcodes.com/?url=https://blog-247829357775.gifthub.news/post/4310795628" target="_blank" class="custom-link">External link</a>
  128. <a href="https://294634822590-edu.gifthub.com.ru/?url=https://blog-247829357775.gifthub.news/post/4310795628" target="_blank" class="custom-link">External link</a>
  129. <a href="https://669828552526-gov.iliiili.com/?url=https://blog-247829357775.gifthub.news/post/4310795628" target="_blank" class="custom-link">External link</a>
  130. <a href="https://802816736190-gov.digwow.net/?url=https://blog-247829357775.gifthub.news/post/4310795628" target="_blank" class="custom-link">External link</a>
  131. <a href="https://582741808890-gov.free-giftcodes.com/?url=https://blog-247829357775.gifthub.news/post/4310795628" target="_blank" class="custom-link">External link</a>
  132. <a href="https://645908598870-gov.gifthub.com.ru/?url=https://blog-247829357775.gifthub.news/post/4310795628" target="_blank" class="custom-link">External link</a>
  133. <a href="https://link.naver.com/bridge?544263212497&amp;url=https://blog-247829357775.gifthub.news/post/4310795628" target="_blank" class="custom-link">External link</a>
  134. <a href="https://link.naver.com/bridge?678457522022&amp;url=https://naver678457522022-edu.digwow.net" target="_blank" class="custom-link">External link</a>
  135. <a href="https://link.naver.com/bridge?981779723149&amp;url=https://naver981779723149-edu.iliiili.com" target="_blank" class="custom-link">External link</a>
  136. <a href="https://link.naver.com/bridge?561811589335&amp;url=https://naver561811589335-edu.1717173.xyz" target="_blank" class="custom-link">External link</a>
  137. <a href="https://link.naver.com/bridge?187390689856&amp;url=https://naver187390689856-edu.gifthub.com.ru" target="_blank" class="custom-link">External link</a>
  138. <a href="https://link.naver.com/bridge?738153110392&amp;url=https://naver738153110392-gov.digwow.net" target="_blank" class="custom-link">External link</a>
  139. <a href="https://link.naver.com/bridge?451394802642&amp;url=https://naver451394802642-gov.iliiili.com" target="_blank" class="custom-link">External link</a>
  140. <a href="https://link.naver.com/bridge?600586260175&amp;url=https://naver600586260175-gov.1717173.xyz" target="_blank" class="custom-link">External link</a>
  141. <a href="https://link.naver.com/bridge?486516862991&amp;url=https://naver486516862991-gov.gifthub.com.ru" target="_blank" class="custom-link">External link</a>
  142. <a href="https://link.naver.com/bridge?372647807966&amp;url=https://naver372647807966-gov-edu.digwow.net" target="_blank" class="custom-link">External link</a>
  143. <a href="https://link.naver.com/bridge?582500149801&amp;url=https://naver582500149801-gov-edu.iliiili.com" target="_blank" class="custom-link">External link</a>
  144. <a href="https://link.naver.com/bridge?587776914278&amp;url=https://naver587776914278-gov-edu.1717173.xyz" target="_blank" class="custom-link">External link</a>
  145. <a href="https://link.naver.com/bridge?969756315675&amp;url=https://naver969756315675-gov-edu.gifthub.com.ru" target="_blank" class="custom-link">External link</a>
  146. <a href="https://blog-680570629407.gifthub.news/" target="_blank" class="custom-link">External link</a>
  147. <a href="https://blog-098526413389.jp-edu.sbs/" target="_blank" class="custom-link">External link</a>
  148. <a href="https://blog-020598066114.kr-edu.sbs/" target="_blank" class="custom-link">External link</a>
  149. <a href="https://blog-186127837799.krlinkedin.sbs/" target="_blank" class="custom-link">External link</a>
  150. <a href="https://blog-431770772722.mit-edu.sbs/" target="_blank" class="custom-link">External link</a>
  151. <a href="https://blog-538240668381.mit-edu.buzz/" target="_blank" class="custom-link">External link</a>
  152. <a href="https://blog-175844798975.mit-edu.tech/" target="_blank" class="custom-link">External link</a>
  153. <a href="https://blog-943115379104.mit-edu.site/" target="_blank" class="custom-link">External link</a>
  154. <a href="https://blog-271019226801.mit-edu.top/" target="_blank" class="custom-link">External link</a>
  155. <a href="https://blog-380177761083.usa-gov.top/" target="_blank" class="custom-link">External link</a>
  156. <a href="https://research-621541068170.mit-edu.pp.ua/?url=https://blog-247829357775.gifthub.news/post/4310795628" target="_blank" class="custom-link">External link</a>
  157. <a href="https://research-092783811829.harvard-edu.pp.ua/?url=https://blog-247829357775.gifthub.news/post/4310795628" target="_blank" class="custom-link">External link</a>
  158. <a href="https://research-606804267321.stanford-edu.pp.ua/?url=https://blog-247829357775.gifthub.news/post/4310795628" target="_blank" class="custom-link">External link</a>
  159. <a href="https://research-538445455623.cambridge-edu.pp.ua/?url=https://blog-247829357775.gifthub.news/post/4310795628" target="_blank" class="custom-link">External link</a>
  160. <a href="https://research-904197067748.berkeley-edu.pp.ua/?url=https://blog-247829357775.gifthub.news/post/4310795628" target="_blank" class="custom-link">External link</a>
  161. <a href="https://research-165807050895.oxford-edu.pp.ua/?url=https://blog-247829357775.gifthub.news/post/4310795628" target="_blank" class="custom-link">External link</a>
  162. <a href="https://research-430992393712-edu.wwv.pp.ua/?url=https://blog-247829357775.gifthub.news/post/4310795628" target="_blank" class="custom-link">External link</a>
  163. <a href="https://research-518383109699-edu.sean.pp.ua/?url=https://blog-247829357775.gifthub.news/post/4310795628" target="_blank" class="custom-link">External link</a>
  164. <a href="https://research-404594037027-edu.line.pp.ua/?url=https://blog-247829357775.gifthub.news/post/4310795628" target="_blank" class="custom-link">External link</a>
  165. </p>
  166.                    <div class="row mt-5 pt-5 border-top">
  167.                    </div>
  168.                </div>
  169.            </div>
  170.        </div>
  171.    </div>
  172.    <div class="section pb-0">
  173.        <div class="container">
  174.            <div class="row">
  175.                <div class="col-lg-12">
  176.                    <h2 class="heading">Related</h2>
  177.                </div>
  178.            </div>
  179.            <div class="row justify-content-center">
  180.                <div class="col-lg-12">
  181.                    <div class="post-entry d-md-flex small-horizontal mb-5">
  182.                        <div class="me-md-5 thumbnail mb-3 mb-md-0">
  183.                            <a href="https://blog-247829357775.gifthub.news/post/2851940736">
  184.                            <img src="https://x.gifthub.news/static/images/post/17.jpg" alt="Designing Stable Virtual Economies Through Dynamic Supply Chain Mechanisms" title="Designing Stable Virtual Economies Through Dynamic Supply Chain Mechanisms" class="img-fluid lazyload">
  185.                            </a>
  186.                        </div>
  187.                        <div class="content">
  188.                            <div class="post-meta mb-3">
  189.                                <a href="https://blog-2851940736.gifthub.news/post/2851940736/" target="_blank">
  190.                                <span class="date">2025-02-04</span>
  191.                                </a>
  192.                            </div>
  193.                            <h2 class="heading"><a href="https://blog-247829357775.gifthub.news/post/2851940736">Designing Stable Virtual Economies Through Dynamic Supply Chain Mechanisms</a></h2>
  194.                            <p class="info">The rise of e-sports has elevated gaming to a competitive arena, where skill, strategy, and teamwork converge to create spectacles that rival traditional sports. From epic tournaments with massive prize pools to professional leagues with dedicated fan bases, e-sports has become a global phenomenon, showcasing the talent and dedication of gamers worldwide. The adrenaline-fueled battles and nail-biting finishes not only entertain but also inspire a new generation of aspiring gamers and professional athletes.</p>
  195.                            <a href="https://blog-247829357775.gifthub.news/post/2851940736" class="post-author d-flex align-items-center">
  196.                                <div class="author-pic">
  197.                                    <img src="https://x.gifthub.news/static/images/user/7.jpg" alt="Designing Stable Virtual Economies Through Dynamic Supply Chain Mechanisms" title="Designing Stable Virtual Economies Through Dynamic Supply Chain Mechanisms" class="lazyload">
  198.                                </div>
  199.                                <div class="text">
  200.                                    <strong>Ashley Adams</strong>
  201.                                    <span>2025-02-04 published post</span>
  202.                                </div>
  203.                            </a>
  204.                        </div>
  205.                    </div>
  206.                </div>
  207.                <div class="col-lg-12">
  208.                    <div class="post-entry d-md-flex small-horizontal mb-5">
  209.                        <div class="me-md-5 thumbnail mb-3 mb-md-0">
  210.                            <a href="https://blog-247829357775.gifthub.news/post/6230851749">
  211.                            <img src="https://x.gifthub.news/static/images/post/4.jpg" alt="Gamifying Professional Training for Enhancing Skill Transfer in the Workplace" title="Gamifying Professional Training for Enhancing Skill Transfer in the Workplace" class="img-fluid lazyload">
  212.                            </a>
  213.                        </div>
  214.                        <div class="content">
  215.                            <div class="post-meta mb-3">
  216.                                <a href="https://blog-6230851749.gifthub.news/post/6230851749/" target="_blank">
  217.                                <span class="date">2025-02-04</span>
  218.                                </a>
  219.                            </div>
  220.                            <h2 class="heading"><a href="https://blog-247829357775.gifthub.news/post/6230851749">Gamifying Professional Training for Enhancing Skill Transfer in the Workplace</a></h2>
  221.                            <p class="info">This research explores the role of mobile games in the development of social capital within online multiplayer communities. The study draws on social capital theory to examine how players form bonds, share resources, and collaborate within game environments. By analyzing network structures, social interactions, and community dynamics, the paper investigates how mobile games contribute to the creation of virtual social networks that extend beyond gameplay and influence offline relationships. The research also explores the role of mobile games in fostering a sense of belonging and collective identity, while addressing the potential for social exclusion, toxicity, and exploitation within game communities.</p>
  222.                            <a href="https://blog-247829357775.gifthub.news/post/6230851749" class="post-author d-flex align-items-center">
  223.                                <div class="author-pic">
  224.                                    <img src="https://x.gifthub.news/static/images/user/2.jpg" alt="Gamifying Professional Training for Enhancing Skill Transfer in the Workplace" title="Gamifying Professional Training for Enhancing Skill Transfer in the Workplace" class="lazyload">
  225.                                </div>
  226.                                <div class="text">
  227.                                    <strong>Edward Roberts</strong>
  228.                                    <span>2025-02-04 published post</span>
  229.                                </div>
  230.                            </a>
  231.                        </div>
  232.                    </div>
  233.                </div>
  234.                <div class="col-lg-12">
  235.                    <div class="post-entry d-md-flex small-horizontal mb-5">
  236.                        <div class="me-md-5 thumbnail mb-3 mb-md-0">
  237.                            <a href="https://blog-247829357775.gifthub.news/post/6407859123">
  238.                            <img src="https://x.gifthub.news/static/images/post/16.jpg" alt="The Use of LIDAR in AR Games for Enhanced Real-World Interaction" title="The Use of LIDAR in AR Games for Enhanced Real-World Interaction" class="img-fluid lazyload">
  239.                            </a>
  240.                        </div>
  241.                        <div class="content">
  242.                            <div class="post-meta mb-3">
  243.                                <a href="https://blog-6407859123.gifthub.news/post/6407859123/" target="_blank">
  244.                                <span class="date">2025-02-04</span>
  245.                                </a>
  246.                            </div>
  247.                            <h2 class="heading"><a href="https://blog-247829357775.gifthub.news/post/6407859123">The Use of LIDAR in AR Games for Enhanced Real-World Interaction</a></h2>
  248.                            <p class="info">This research examines the application of Cognitive Load Theory (CLT) in mobile game design, particularly in optimizing the balance between game complexity and player capacity for information processing. The study investigates how mobile game developers can use CLT principles to design games that maximize player learning and engagement by minimizing cognitive overload. Drawing on cognitive psychology and game design theory, the paper explores how different types of cognitive load—intrinsic, extraneous, and germane—affect player performance, frustration, and enjoyment. The research also proposes strategies for using game mechanics, tutorials, and difficulty progression to ensure an optimal balance of cognitive load throughout the gameplay experience.</p>
  249.                            <a href="https://blog-247829357775.gifthub.news/post/6407859123" class="post-author d-flex align-items-center">
  250.                                <div class="author-pic">
  251.                                    <img src="https://x.gifthub.news/static/images/user/3.jpg" alt="The Use of LIDAR in AR Games for Enhanced Real-World Interaction" title="The Use of LIDAR in AR Games for Enhanced Real-World Interaction" class="lazyload">
  252.                                </div>
  253.                                <div class="text">
  254.                                    <strong>John Smith</strong>
  255.                                    <span>2025-02-04 published post</span>
  256.                                </div>
  257.                            </a>
  258.                        </div>
  259.                    </div>
  260.                </div>
  261.            </div>
  262.        </div>
  263.    </div>
  264.    <div class="py-5 bg-light mx-md-3 sec-subscribe">
  265.        <div class="container">
  266.            <div class="row">
  267.                <div class="col-lg-12">
  268.                    <h2 class="h4 fw-bold">Subscribe to newsletter</h2>
  269.                </div>
  270.            </div>
  271.            <form class="row">
  272.                <div class="col-md-8">
  273.                    <div class="mb-3 mb-md-0">
  274.                        <input type="email" class="form-control" placeholder="Enter your email">
  275.                    </div>
  276.                </div>
  277.                <div class="col-md-4 d-grid">
  278.                    <input type="submit" class="btn btn-primary" value="Subscribe">
  279.                </div>
  280.            </form>
  281.        </div>
  282.    </div>
  283.    <div class="site-footer">
  284.        <div class="container">
  285.            <div class="row justify-content-center copyright">
  286.                <div class="col-lg-7 text-center">
  287.                    <div class="widget">
  288.                        <p>Copyright &copy;
  289.                            <script>document.write(new Date().getFullYear());</script> All rights reserved.
  290.                        </p>
  291. <p>
  292.    < Top VPS Hosting Choice ><br>
  293.    <a href="https://evolution-host.com?ref=DQgZ6P" target="_blank">
  294.        <img src="https://x.gifthub.news/static/images/evolution-host.png" alt="Evolution Host" title="Evolution Host" class="evhost lazyload">
  295.    </a>
  296. </p>
  297.                    </div>
  298.                </div>
  299.            </div>
  300.        </div>
  301.    </div>
  302. </body>
  303.  
  304. </html>
Copyright © 2002-9 Sam Ruby, Mark Pilgrim, Joseph Walton, and Phil Ringnalda