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://research-517177.gifthub.news/post/2570194368

  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>A Framework for Real-Time Testing of Game Physics Engines #288634902597 (2025-02-01)</title>
  9.    <link rel="canonical" href="https://research-517177.gifthub.news/post/2570194368">
  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="A Framework for Real-Time Testing of Game Physics Engines" />
  17.    <meta property="og:description" content="A Framework for Real-Time Testing of Game Physics Engines #288634902597 (2025-02-01)" />
  18.    <meta property="og:url" content="https://research-517177.gifthub.news/post/2570194368" />
  19.    <meta property="og:site_name" content="gifthub.news" />
  20.    <meta property="og:image" content="https://x.gifthub.news/static/images/post/3.jpg" />
  21.    <meta property="og:article:published_time" content="2025-02-01T15:52:05Z" />
  22.    <meta property="og:article:author" content="Dr. Katherine Foster" />
  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": "A Framework for Real-Time Testing of Game Physics Engines #288634902597 (2025-02-01)",
  30.            "author": {
  31.                "@type": "Person",
  32.                "name": "Dr. Katherine Foster",
  33.                "affiliation": {
  34.                    "@type": "Organization",
  35.                    "name": "gifthub.news"
  36.                },
  37.                "url": "https://research-517177.gifthub.news/post/2570194368"
  38.            },
  39.            "datePublished": "2025-02-01T15:52:05Z",
  40.            "image": "https://x.gifthub.news/static/images/post/3.jpg",
  41.            "journal": {
  42.                "@type": "Periodical",
  43.                "name": "gifthub.news",
  44.                "issn": "10.1069/288634902597"
  45.            },
  46.            "publisher": {
  47.                "@type": "Organization",
  48.                "name": "gifthub.news",
  49.                "url": "https://research-517177.gifthub.news"
  50.            },
  51.            "doi": "288634902597",
  52.            "abstract": "A Framework for Real-Time Testing of Game Physics Engines #288634902597 (2025-02-01)",
  53.            "citation": {
  54.                "@type": "CreativeWork",
  55.                "name": "A Framework for Real-Time Testing of Game Physics Engines",
  56.                "author": "Dr. Katherine Foster",
  57.                "datePublished": "2025-02-01T15:52:05Z",
  58.                "url": "https://research-517177.gifthub.news/post/2570194368"
  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://research-517177.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/16.jpg" alt="A Framework for Real-Time Testing of Game Physics Engines" title="A Framework for Real-Time Testing of Game Physics Engines" class="author-pic img-fluid rounded-circle mx-auto">
  92.                    </div>
  93.                    <span class="d-block text-center">Katherine Foster</span>
  94.                    <span class="date d-block text-center small text-uppercase text-black-50 mb-5">2025-02-01</span>
  95.                    <h2 class="heading text-center">A Framework for Real-Time Testing of Game Physics Engines</h2>
  96.                    <p class="lead mb-4 text-center">Thanks to Katherine Foster for contributing the article "A Framework for Real-Time Testing of Game Physics Engines".
  97.                    </p>
  98.                    <img src="https://x.gifthub.news/static/images/post/3.jpg" alt="A Framework for Real-Time Testing of Game Physics Engines" title="A Framework for Real-Time Testing of Game Physics Engines" class="img-fluid rounded mb-4 lazyload">
  99.                    <p>This research examines the convergence of mobile gaming and virtual reality (VR) technologies, focusing on how the integration of VR into mobile games can create immersive, interactive experiences for players. The study explores the technical challenges of VR gaming on mobile devices, including hardware limitations, motion tracking, and user comfort, as well as the design principles that enable seamless interaction between virtual environments and physical spaces. The paper investigates the cognitive and emotional effects of VR gaming, particularly in relation to presence, immersion, and player agency. It also addresses the potential for VR to revolutionize mobile gaming experiences, creating new opportunities for storytelling, social interaction, and entertainment.</p>
  100. <p>This paper examines the role of multiplayer mobile games in facilitating socialization, community building, and the formation of online social networks. The study investigates how multiplayer features such as cooperative gameplay, competitive modes, and guilds foster interaction among players and create virtual communities. Drawing on social network theory and community dynamics, the research explores the impact of multiplayer mobile games on players' social behavior, including collaboration, communication, and identity formation. The paper also evaluates the potential negative effects of online gaming communities, such as toxicity, exclusion, and cyberbullying, and offers strategies for developers to promote positive social interaction and inclusive communities in multiplayer games.</p>
  101. <p>This paper offers a post-structuralist analysis of narrative structures in mobile games, emphasizing how game narratives contribute to the construction of player identity and agency. It explores the intersection of game mechanics, storytelling, and player interaction, considering how mobile games as “digital texts” challenge traditional notions of authorship and narrative control. Drawing upon the works of theorists like Michel Foucault and Roland Barthes, the paper examines the decentralized nature of mobile game narratives and how they allow players to engage in a performative process of meaning-making, identity construction, and subversion of preordained narrative trajectories.</p>
  102. <p>This paper explores the use of artificial intelligence (AI) in predicting player behavior in mobile games. It focuses on how AI algorithms can analyze player data to forecast actions such as in-game purchases, playtime, and engagement. The research examines the potential of AI to enhance personalized gaming experiences, improve game design, and increase player retention rates.</p>
  103. <p>This research delves into the phenomenon of digital addiction within the context of mobile gaming, focusing on the psychological mechanisms that contribute to excessive play. The study draws on addiction psychology, neuroscience, and behavioral science to explore how mobile games utilize reward systems, variable reinforcement schedules, and immersive experiences to keep players engaged. The paper examines the societal impacts of mobile gaming addiction, including its effects on productivity, relationships, and mental health. Additionally, it offers policy recommendations for mitigating the negative effects of mobile game addiction, such as implementing healthier game design practices and promoting responsible gaming habits.</p>
  104.  
  105.                    <p>
  106.                    <a href="/redirect/?url=https://research-517177.gifthub.news/post/2570194368" 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://984022044318-edu.iliiili.com/" target="_blank" class="custom-link">External link</a>
  114. <a href="https://131477915043-edu.digwow.net/" target="_blank" class="custom-link">External link</a>
  115. <a href="https://297579568061-edu.free-giftcodes.com/" target="_blank" class="custom-link">External link</a>
  116. <a href="https://275606420668-edu.gifthub.com.ru/" target="_blank" class="custom-link">External link</a>
  117. <a href="https://360965294051-gov.iliiili.com/" target="_blank" class="custom-link">External link</a>
  118. <a href="https://008805932592-gov.digwow.net/" target="_blank" class="custom-link">External link</a>
  119. <a href="https://135201047134-gov.free-giftcodes.com/" target="_blank" class="custom-link">External link</a>
  120. <a href="https://664069260141-gov.gifthub.com.ru/" target="_blank" class="custom-link">External link</a>
  121. <a href="https://644893117648-gov-edu.iliiili.com/" target="_blank" class="custom-link">External link</a>
  122. <a href="https://742556922438-gov-edu.digwow.net/" target="_blank" class="custom-link">External link</a>
  123. <a href="https://355470634014-gov-edu.free-giftcodes.com/" target="_blank" class="custom-link">External link</a>
  124. <a href="https://426290165411-gov-edu.gifthub.com.ru/" target="_blank" class="custom-link">External link</a>
  125. <a href="https://013356292749-edu.iliiili.com/?url=https://research-517177.gifthub.news/post/2570194368" target="_blank" class="custom-link">External link</a>
  126. <a href="https://703214767496-edu.digwow.net/?url=https://research-517177.gifthub.news/post/2570194368" target="_blank" class="custom-link">External link</a>
  127. <a href="https://403045256582-edu.free-giftcodes.com/?url=https://research-517177.gifthub.news/post/2570194368" target="_blank" class="custom-link">External link</a>
  128. <a href="https://202587557889-edu.gifthub.com.ru/?url=https://research-517177.gifthub.news/post/2570194368" target="_blank" class="custom-link">External link</a>
  129. <a href="https://365004755059-gov.iliiili.com/?url=https://research-517177.gifthub.news/post/2570194368" target="_blank" class="custom-link">External link</a>
  130. <a href="https://585243564823-gov.digwow.net/?url=https://research-517177.gifthub.news/post/2570194368" target="_blank" class="custom-link">External link</a>
  131. <a href="https://589367203704-gov.free-giftcodes.com/?url=https://research-517177.gifthub.news/post/2570194368" target="_blank" class="custom-link">External link</a>
  132. <a href="https://289895843377-gov.gifthub.com.ru/?url=https://research-517177.gifthub.news/post/2570194368" target="_blank" class="custom-link">External link</a>
  133. <a href="https://link.naver.com/bridge?734217575402&amp;url=https://research-517177.gifthub.news/post/2570194368" target="_blank" class="custom-link">External link</a>
  134. <a href="https://link.naver.com/bridge?222503031910&amp;url=https://naver222503031910-edu.digwow.net" target="_blank" class="custom-link">External link</a>
  135. <a href="https://link.naver.com/bridge?495823606028&amp;url=https://naver495823606028-edu.iliiili.com" target="_blank" class="custom-link">External link</a>
  136. <a href="https://link.naver.com/bridge?785326548709&amp;url=https://naver785326548709-edu.1717173.xyz" target="_blank" class="custom-link">External link</a>
  137. <a href="https://link.naver.com/bridge?002103253736&amp;url=https://naver002103253736-edu.gifthub.com.ru" target="_blank" class="custom-link">External link</a>
  138. <a href="https://link.naver.com/bridge?196709687219&amp;url=https://naver196709687219-gov.digwow.net" target="_blank" class="custom-link">External link</a>
  139. <a href="https://link.naver.com/bridge?874745655976&amp;url=https://naver874745655976-gov.iliiili.com" target="_blank" class="custom-link">External link</a>
  140. <a href="https://link.naver.com/bridge?291675285865&amp;url=https://naver291675285865-gov.1717173.xyz" target="_blank" class="custom-link">External link</a>
  141. <a href="https://link.naver.com/bridge?734556443927&amp;url=https://naver734556443927-gov.gifthub.com.ru" target="_blank" class="custom-link">External link</a>
  142. <a href="https://link.naver.com/bridge?493080609876&amp;url=https://naver493080609876-gov-edu.digwow.net" target="_blank" class="custom-link">External link</a>
  143. <a href="https://link.naver.com/bridge?395971454900&amp;url=https://naver395971454900-gov-edu.iliiili.com" target="_blank" class="custom-link">External link</a>
  144. <a href="https://link.naver.com/bridge?555857696904&amp;url=https://naver555857696904-gov-edu.1717173.xyz" target="_blank" class="custom-link">External link</a>
  145. <a href="https://link.naver.com/bridge?965952691189&amp;url=https://naver965952691189-gov-edu.gifthub.com.ru" target="_blank" class="custom-link">External link</a>
  146. <a href="https://blog-325826872457.gifthub.news/" target="_blank" class="custom-link">External link</a>
  147. <a href="https://blog-127817304899.jp-edu.sbs/" target="_blank" class="custom-link">External link</a>
  148. <a href="https://blog-158377309882.kr-edu.sbs/" target="_blank" class="custom-link">External link</a>
  149. <a href="https://blog-579725537328.krlinkedin.sbs/" target="_blank" class="custom-link">External link</a>
  150. <a href="https://blog-159539555482.mit-edu.sbs/" target="_blank" class="custom-link">External link</a>
  151. <a href="https://blog-113102360342.mit-edu.buzz/" target="_blank" class="custom-link">External link</a>
  152. <a href="https://blog-805537343307.mit-edu.tech/" target="_blank" class="custom-link">External link</a>
  153. <a href="https://blog-262711033343.mit-edu.site/" target="_blank" class="custom-link">External link</a>
  154. <a href="https://blog-680614894447.mit-edu.top/" target="_blank" class="custom-link">External link</a>
  155. <a href="https://blog-182513249420.usa-gov.top/" target="_blank" class="custom-link">External link</a>
  156. <a href="https://research-523868227288.mit-edu.pp.ua/?url=https://research-517177.gifthub.news/post/2570194368" target="_blank" class="custom-link">External link</a>
  157. <a href="https://research-768103922273.harvard-edu.pp.ua/?url=https://research-517177.gifthub.news/post/2570194368" target="_blank" class="custom-link">External link</a>
  158. <a href="https://research-598540603980.stanford-edu.pp.ua/?url=https://research-517177.gifthub.news/post/2570194368" target="_blank" class="custom-link">External link</a>
  159. <a href="https://research-812541428239.cambridge-edu.pp.ua/?url=https://research-517177.gifthub.news/post/2570194368" target="_blank" class="custom-link">External link</a>
  160. <a href="https://research-531769119064.berkeley-edu.pp.ua/?url=https://research-517177.gifthub.news/post/2570194368" target="_blank" class="custom-link">External link</a>
  161. <a href="https://research-024422414669.oxford-edu.pp.ua/?url=https://research-517177.gifthub.news/post/2570194368" target="_blank" class="custom-link">External link</a>
  162. <a href="https://research-801624588764-edu.wwv.pp.ua/?url=https://research-517177.gifthub.news/post/2570194368" target="_blank" class="custom-link">External link</a>
  163. <a href="https://research-776773186529-edu.sean.pp.ua/?url=https://research-517177.gifthub.news/post/2570194368" target="_blank" class="custom-link">External link</a>
  164. <a href="https://research-870246227380-edu.line.pp.ua/?url=https://research-517177.gifthub.news/post/2570194368" 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://research-517177.gifthub.news/post/3810547269">
  184.                            <img src="https://x.gifthub.news/static/images/post/3.jpg" alt="Impact of Edge Computing on Real-Time Mobile Multiplayer Games" title="Impact of Edge Computing on Real-Time Mobile Multiplayer Games" class="img-fluid lazyload">
  185.                            </a>
  186.                        </div>
  187.                        <div class="content">
  188.                            <div class="post-meta mb-3">
  189.                                <a href="https://blog-3810547269.gifthub.news/post/3810547269/" target="_blank">
  190.                                <span class="date">2025-02-01</span>
  191.                                </a>
  192.                            </div>
  193.                            <h2 class="heading"><a href="https://research-517177.gifthub.news/post/3810547269">Impact of Edge Computing on Real-Time Mobile Multiplayer Games</a></h2>
  194.                            <p class="info">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>
  195.                            <a href="https://research-517177.gifthub.news/post/3810547269" class="post-author d-flex align-items-center">
  196.                                <div class="author-pic">
  197.                                    <img src="https://x.gifthub.news/static/images/user/16.jpg" alt="Impact of Edge Computing on Real-Time Mobile Multiplayer Games" title="Impact of Edge Computing on Real-Time Mobile Multiplayer Games" class="lazyload">
  198.                                </div>
  199.                                <div class="text">
  200.                                    <strong>John Smith</strong>
  201.                                    <span>2025-02-01 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://research-517177.gifthub.news/post/5168279304">
  211.                            <img src="https://x.gifthub.news/static/images/post/11.jpg" alt="Gamification as a Tool for Teaching Computational Ethics in STEM Education" title="Gamification as a Tool for Teaching Computational Ethics in STEM Education" class="img-fluid lazyload">
  212.                            </a>
  213.                        </div>
  214.                        <div class="content">
  215.                            <div class="post-meta mb-3">
  216.                                <a href="https://blog-5168279304.gifthub.news/post/5168279304/" target="_blank">
  217.                                <span class="date">2025-02-01</span>
  218.                                </a>
  219.                            </div>
  220.                            <h2 class="heading"><a href="https://research-517177.gifthub.news/post/5168279304">Gamification as a Tool for Teaching Computational Ethics in STEM Education</a></h2>
  221.                            <p class="info">The future of gaming is a tapestry woven with technological innovations, creative visions, and player-driven evolution. Advancements in artificial intelligence (AI), virtual reality (VR), augmented reality (AR), cloud gaming, and blockchain technology promise to revolutionize how we play, experience, and interact with games, ushering in an era of unprecedented possibilities and immersive experiences.</p>
  222.                            <a href="https://research-517177.gifthub.news/post/5168279304" class="post-author d-flex align-items-center">
  223.                                <div class="author-pic">
  224.                                    <img src="https://x.gifthub.news/static/images/user/10.jpg" alt="Gamification as a Tool for Teaching Computational Ethics in STEM Education" title="Gamification as a Tool for Teaching Computational Ethics in STEM Education" class="lazyload">
  225.                                </div>
  226.                                <div class="text">
  227.                                    <strong>Kathleen Simmons</strong>
  228.                                    <span>2025-02-01 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://research-517177.gifthub.news/post/3691804725">
  238.                            <img src="https://x.gifthub.news/static/images/post/20.jpg" alt="Optimizing Reward Timing in Mobile Games for Long-Term Retention" title="Optimizing Reward Timing in Mobile Games for Long-Term Retention" class="img-fluid lazyload">
  239.                            </a>
  240.                        </div>
  241.                        <div class="content">
  242.                            <div class="post-meta mb-3">
  243.                                <a href="https://blog-3691804725.gifthub.news/post/3691804725/" target="_blank">
  244.                                <span class="date">2025-02-01</span>
  245.                                </a>
  246.                            </div>
  247.                            <h2 class="heading"><a href="https://research-517177.gifthub.news/post/3691804725">Optimizing Reward Timing in Mobile Games for Long-Term Retention</a></h2>
  248.                            <p class="info">This study investigates the potential of blockchain technology to decentralize mobile gaming, offering new opportunities for player empowerment and developer autonomy. By leveraging smart contracts, decentralized finance (DeFi), and non-fungible tokens (NFTs), blockchain could allow players to truly own in-game assets, trade them across platforms, and participate in decentralized governance of games. The paper examines the technological challenges, economic opportunities, and legal implications of blockchain integration in mobile gaming ecosystems. It also considers the ethical concerns regarding virtual asset ownership and the potential for blockchain to disrupt existing monetization models.</p>
  249.                            <a href="https://research-517177.gifthub.news/post/3691804725" class="post-author d-flex align-items-center">
  250.                                <div class="author-pic">
  251.                                    <img src="https://x.gifthub.news/static/images/user/7.jpg" alt="Optimizing Reward Timing in Mobile Games for Long-Term Retention" title="Optimizing Reward Timing in Mobile Games for Long-Term Retention" class="lazyload">
  252.                                </div>
  253.                                <div class="text">
  254.                                    <strong>Jennifer Lopez</strong>
  255.                                    <span>2025-02-01 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