Nanotechnology

Op vrijdagavond 27 februari is de EENENTWINTIG Bitcoin Utrecht meetup bij Wonders of Work! Je kunt je drinken betalen met Bitcoin Lightning, dus neem je wallet mee. Tijdens het Vierdevrijdag programma zal er kennis gedeeld worden over diverse tech onderwerpen. Heb je zelf een onderwerp over Bitcoin, neem dan contact op en we zetten deze op het programma. Het doel van deze meet-up is vooral om andere (toekomstige) bitcoiners te ontmoeten. Je bent welkom vanaf 19.00 en duurt zolang er mensen zijn (maar uiterlijk tot 22.00). Mocht je om 17.30 mee willen eten, geef dat dan aan op Telegram of Signal. Meer info over Vierdevrijdag is beschikbaar via https://wondersofwork.nl/agenda/vierdevrijdag-voorheen-tech-tuesday-27-02/

Let’s go to all nighter Speedy J at Club Basis

Join us for a fun session of improv theatre in English! A great opportunity to meet new people in Utrecht and learn something new with Improv Utrecht. Everyone can partcipate, you don't need any experience in theatre nor fluency in English. **Special topic: Movement & Theatre improv** Movement improvisation is a wonderful basis for all other forms of improvisation. Well before we had language we had movement; there is so much that can be expressed without words. Instead of the games that are used in theater improv, we work mostly with “scores”, or a kind of blueprint to what will happen in a space of time. A kind of a structure. We will do exercises that originate from Viewpoints, physical theater, and other forms of improvisation (including a bit of Contact Improv at times), and moving in/with/through the space, non verbal contact and how we can communicate through our bodies. Anyone can participate, you don’t need any experience in movement or theater nor complete fluency in English. This workshop is without shoes: bring non-slippery socks In this session you will: * Meet fellow international and local players. * Learn the basics of improvisation, a 21st-century skill that is useful in many aspects of life. * Get out of your head. * Enjoy failing. * Play funny and moving theatre games. * Laugh a lot, while surprising yourself and others. Doors open: 19:50-20:00, come in with the others ([SIDE entrance, at the Troelstralaan](https://maps.app.goo.gl/ntLDUqbkDxMHjp7B7)). After 20:01 the door may be closed, but you may find a participant who knows the door code. Workshop: 20:00-22:00 Every Friday except in school holidays Afterwards we have drinks at [O'Leary's](https://maps.app.goo.gl/gL878K1MZf8v5fpm7) pub together ### How to sign up Full details about how to sign up and any other questions you may have can be [found on our website](https://www.improvutrecht.nl/drop-in-workshops/). An RSVP in this Meetup event is not enough! We track attendance by counting the attendants in GrasshopperSignup. If you flag yourself as attending and can no longer make it, please delete your x in the sheet so that someone else can take your spot. If you leave your contact details at the Signup form we will contact you if there is a problem with a drop-in you are scheduled to attend. We also have a WhatsApp group with a variety of members from across Utrecht where we share events and updates. You can find our courses and shows on [our website](https://www.improvutrecht.nl). Participation is pay-what-you-can, but we suggest a donation of €10-20 by cash or Tikkie to help cover costs (location, travel) and show your appreciation for our professional trainers who dedicate their Friday to promoting improv.

**This might be the girls night you didn’t know you needed.** Many women are living in constant “on” mode- always busy, always giving. And somewhere along the way, we forget how good it feels to simply *be together*. This is your invitation to a real **girls night, where you can come as you are.** Every 3 weeks we come together to relax, laugh, connect and support each other — without pressure, without fixing, without performance. **When women gather in a safe and supportive space, something powerful happens.** We uplift each other through shared laughter, honest conversations, and non-judgement presence. Being around other women who get it can make everything feel a little lighter and brighter. It helps us feel less alone, more supported, emotionally stronger - sometimes simply by being in the same room together. Sometimes we talk. Sometimes we listen, Sometimes we laugh - and even sing - until our bellies hurt. You’re free to share what’s on your mind, or simply enjoy the energy of being around other women who get it. There’s no agenda. No judgement. Just genuine connection, joy, and friendships that feel *easy and real.* And often, there’s that quiet thought: *“oh wow, I didn’t know I needed this.”* All I ask is that you come exactly as you are — tired, joyful, quiet, loud, curious, or unsure. Everything is welcome. We meet every 3 weeks - in Utrecht, Amsterdam or Leiden - because connection grows when we keep showing up for each other — not perfectly, just honestly. ✨ Come as you are. ✨ Leave feeling lighter, more connected, and a little more yourself.

*Since the guided meditations for this event are in Dutch, this description is too.* Wil je je drukke week afsluiten en ontspannen aan het weekend beginnen? Dan ben je geheel vrijblijvend welkom bij de vrijdagavond meditatie van [Jewel Heart](https://www.jewelheart.nl/). Deze meditatieavond heeft een licht en open karakter. De meditaties bestaan uit drie delen. We beginnen met het gewaarworden van je lichamelijke sensaties. In een korter deel twee doen we een loopmeditatie en in deel drie is er een eenvoudige, geleide visualisatie meditatie. Het geheel wordt afgesloten met een gesprek onder het genot van een kop thee, voor wie daar zin in heeft. 📍[Jewel Heart, Hatertseveldweg 284, Nijmegen](https://maps.app.goo.gl/D4FzqLbkaqs2JNDG8). Loop de oprit op en dan is de ingang aan je rechterzijde 🕒Zaal open vanaf 19.30 uur, meditatie van 20.00 tot 21.00 Je bent van harte welkom! Aan deze activiteit kun je per keer meedoen. Er zijn geen verplichtingen. Op vrijwillige basis kun je op de avond zelf een donatie doen. Kijk ook naar onze -[Open activiteiten](https://www.jewelheart.nl/nl/open-activiteiten/) -[Cursussen](https://www.jewelheart.nl/nl/cursussen-overzicht/)

SEA (Search Engines Amsterdam) is coming ! This session focuses on **IR evaluation for LLMs and agents**, featuring two speakers: **Arthur Câmara** from **Zeta Alpha** and **Mouly Dewan** from **University of Washington**. **Location:** Science Park 904, Room C3.161 **Date**: February 27 **Zoom link**: [https://uva-live.zoom.us/j/65011610507](https://uva-live.zoom.us/j/65011610507) Details below: **Speaker #1**: **Arthur Câmara** from **Zeta Alpha** **Title**: Evaluating (and automatically improving!) Deep Research agents **Abstract**: Given a user's complex information need, a multi-agent Deep Research system iteratively plans, retrieves, and synthesizes evidence across hundreds of documents to produce a high-quality answer. In our case, an *orchestrator agent* coordinates the process, while parallel *worker agents* execute tasks. Current Deep Research systems, however, often rely on hand-engineered prompts and static architectures, making improvement brittle, expensive, and time-consuming. Similarly, evaluating the quality of these agents is far from trivial, specially when no golden-answer exists. At Zeta Alpha, we are looking into improving **both** of these aspects and in how they may interact. Starting from our LLM-as-a-judge project RAGElo, we are looking into how the LLM-as-a-judge framework, specially using pairwise comparisons, may lead to better agents that can self-play and explore different strategies to produce high-quality Deep Research systems that match or outperform expert-crafted prompts. **Bio:** I’m a Senior Research Engineer working on agentic search and evaluation at Zeta Alpha, an R&D-oriented startup based in Amsterdam. Zeta Alpha develops a sovereign AI platform for enterprise costumers allowing large companies to deploy agents that work on their private data, with a high-quality search backend. Before joining Zeta Alpha, I obtained my PhD from TU Delft, working on Search-as-Learning and Neural IR. **Speaker #2: Mouly Dewan** from **University of Washington** **Title:** LLM-Driven Usefulness Judgment for Web Search Evaluation **Abstract:** Evaluation is fundamental to optimizing search experiences and supporting diverse user intents in Information Retrieval (IR). Traditional search evaluation methods primarily rely on relevance labels, which assess how well retrieved documents match a user's query. However, relevance alone fails to capture a search system’s effectiveness in helping users achieve their search goals, making usefulness a critical evaluation criterion. Recent LLM enabled evaluation works have mostly focused on relevance label generation. In this paper, we explore an alternative approach: LLM-generated usefulness labels which incorporate both implicit and explicit user behavior signals along with relevance to evaluate document usefulness. We introduce Task-aware Rubric-based Usefulness Evaluation (TRUE), a reproducible rubric-driven evaluation framework that leverages iterative sampling and Chain-of-Thought reasoning to model complex search behavior patterns. Our comprehensive study shows that: (i) pre-trained LLMs can generate moderate usefulness labels when provided with rich session-level context; and (ii) LLMs with TRUE framework outperform existing state-of-the-art methods as well as our systematically constructed baseline. We further examine whether LLMs can distinguish between relevance and usefulness, particularly in unique divergence cases between them. Additionally, we conduct an ablation study to identify key features for accurate usefulness label generation, enabling cost-effective evaluation. Overall, this work advances LLM-based evaluation beyond relevance by proposing a reproducible and scalable framework for usefulness judgment, addressing key reproducibility challenges and supporting large-scale LLM-based evaluation. **Bio:** I am Mouly, a 3rd Year PhD student in Information School at the University of Washington, Seattle. My research lies at the intersection of Interactive Information Retrieval (IIR) and Conversational AI, with an emphasis on developing and applying novel evaluation methodologies, particularly leveraging LLMs (LLM4Eval) to improve search, recommendation and proactive conversational information seeking systems. **Counter:** SEA Talks #299 and #300.

**Join us for the second event at our new location: *The Social Hub Amsterdam City!*** **Tech Drinks + Pitching** is our regular meet-up for the tech and entrepreneurial community in the Netherlands, hosted in Amsterdam. Each month we bring together tech start-ups and individuals to have drink, pitch ideas, swap stories, share failed experiments, and plot a bit of world domination. **If you're interested in pitching during the event, please apply via this** **[form](https://airtable.com/appljL4XpOxxrhj9N/pagARYxyKd1i9mD4n/form).** Follow Tech Makers **[here](https://luma.com/techmakers?k=c)** for upcoming events, interesting people, and a little mischief *Looking for a cofounder? Try the matching platform we created, [https://findyourcofounder.nl](https://findyourcofounder.nl/)* *Register for free and let's boost entrepreneurship in the Netherlands !!*

Maandelijkse, informele meetup voor mensen die actief zijn in **Bitcoin, crypto, investeren of de techwereld**. Geen presentaties of verkoop — gewoon goede gesprekken en echte connecties. ### Wat kun je verwachten? * Gesprekken over Bitcoin, crypto, investeren en tech * Delen van inzichten, ervaringen en strategieën * Praten over groei, fouten en lessen * Leren van elkaar, zonder druk of verwachtingen * Eventueel individueel handelen (op eigen verantwoordelijkheid) ### Voor wie? Deze meetup is bedoeld voor mensen die: * Interesse hebben in crypto, investeren of tech * Respectvol met anderen omgaan * Waarde hechten aan een veilige en vertrouwde omgeving ### Waarden Respect staat centraal. God en geloof worden gerespecteerd. Vloeken en onrespectvol gedrag worden niet geaccepteerd. Geen hypes — **gewoon echte gesprekken**.

⚠️ **IMPORTANT: You must sign up and buy a ticket here to attend:** [https://groupvibe.com/](https://groupvibe.com/) **Join the Utrecht Coffee Club and make new friends!** Each meetup brings together 4–6 people for casual conversations over coffee. We use the Groupvibe platform to facilitate the meetup and ensure everyone’s a good fit. 👉 **To attend, you’ll need to complete registration via this link:** [https://groupvibe.com/](https://groupvibe.com/) We’ll share the exact location of the upcoming meetup the night before only if you have bought a ticket or membership plan. **Why this works:** \* Smaller groups make real conversations easier. \* Discover new cafes in your city, together. \* Curated cafes with good coffee and vibe. \* If you hit it off with your group, there’s plenty of time to hang out afterwards. **Note:** RSVPs on Meetup don’t reflect total attendance. Many attendees register directly via our website. The event on [Meetup.com](http://meetup.com/) is only a placeholder. This meetup is organized by Groupvibe, a small team passionate about helping people form meaningful friendships offline.

**🟢🟢 ABOUT OUR WATERCOLOR PAINTING PARTY / AMERSFOORT** 🎨🥳🍷🏢 Amersfoort - Utrecht Province / Center of the City / Easy access from train station. Create your very own **portrait, animals, landscape, or figurative** masterpiece in only **2.5 HOURS using watercolor and our secret mixed media techniques!🧪🧫.** This session is not about perfection; it is about capturing emotions and personal expression. **No experience required** **\- trust us\!** our professional artist will guide you step-by-step through this unique self-portrait journey. You can look forward to a fun and exciting evening with other participants, **so it doesn't matter if you want to come with friends or alone - you are very welcome!** This is the perfect after-work or weekend activity where you'll unleash your creativity while creating something deeply personal. You will create a portrait combining painting, drawing, and creative techniques to bring your unique vision to life. When finished, you'll take home your newly created self-portrait artwork to cherish or share with loved ones. Each participant will have pencils, colored pencils, watercolor, acrylic/gouache paints, and a surface. You'll work from an image we will bring. **🎟️ READY TO HAVE FUN?** Get your Ticket and book your seat **✨[HERE](https://buymeacoffee.com/artloversclub/e/430555) ✨** 🤔 **Questions?** Speak with a member of the team in **[WHATSAPP HERE](https://chat.whatsapp.com/J3Y5yeWUhvbJM98bqty2WP) 💬** .................................... **🟢🟢 WHAT'S INCLUDED?** 🔶 All supplies included 🔶 **2.5-HOUR [TICKET SESSION](https://buymeacoffee.com/artloversclub/e/430555)** 🎟️ 🎁 **EXTRA BONUS:** **FREE TICKET**🎟️ to participate in our Drawing and Painting Cafes in Amersfoort or Our Online Still-Life sessions if you live far away. 🔶 New friendships and Conversations💬 🔶 Freedom to work at your own pace 🔶 **English tutored activity** (And of course, you can speak in your local language with your friends!🍷🥰🥰🍹) ⭐ No experience needed **🎟️ BOOK YOUR SEAT🪑 IN ADVANCE ✨[HERE](https://buymeacoffee.com/artloversclub/e/430555) ✨!** 🤔 **Questions?** Speak with a member of the team in **[WHATSAPP](https://chat.whatsapp.com/J3Y5yeWUhvbJM98bqty2WP) 💬** **🕑 2026 CALENDAR OF UPCOMING EVENTS:** First Sunday or every month from 11.00 AM - 1:30 PM. .................................... **🎟️ ART LOVERS CLUB / ABOUT US** **ART LOVERS CLUB** is a community where art enthusiasts come together to explore their creativity and connect with new buddies through various events and sessions ( In-Person and Online) . Whether you're a seasoned artist or just starting, we have something for everyone!⭐ To share with you more about what we do, you can see here the overall atmosphere of our events in Amersfoort and also follow us if you want⭐: **[https://www.instagram.com/art_lovers_social_club](https://www.instagram.com/art_lovers_social_club)** 🤔 **Questions?** Speak with a member of the team in **[WHATSAPP](https://chat.whatsapp.com/J3Y5yeWUhvbJM98bqty2WP) 💬** **🕑 2025 CALENDAR OF UPCOMING EVENTS:** First Sunday or every month from 11.00 AM - 1:30 PM. **See you soon. We are looking forward to painting and having Fun Together! 🎨👩🏼‍🎨👨🏼‍🎨👩🏼‍🎨🧑🏼‍🎨🎈**

**(Tickets + event access exclusively available through EventBrite.)** Full event link here [From Fixed to Flow - EventBrite](https://www.eventbrite.nl/e/from-fixed-to-flow-an-online-workshop-of-creativity-and-release-tickets-1981557382473?aff=oddtdtcreator) Loosen the mental knots you didn’t know you were tightening. Use creativity to move from fixed patterns into more open habits. Refresh yourself before a new week with an easy, online workshop to open your mental well-being through creative mindset from a stuck sense of routine to more flexible state. \*\* What You'll Experience:\*\* * **Structured, guided conversations** where thinking out loud is part of the method. It's not a lecture, and it is a blend of psychology, art, and practical ritual. * A **live, interactive exercise** to break rigid thinking and experience "flow." * A **supportive space to connect** with others feeling the same desire for more lightness and less rigidity. **️ What You'll Take Away:** * **The "Separation of Tasks" Tool:** A philosopher's secret to deflating anxiety about others' opinions. * **The Conduit Mindset:** How to replace "Is this good?" with the liberating question, **"What happens if you stop deciding in advance what ‘good’ looks like?"** * **Your First Micro-Ritual:** A simple, 5-minute daily practice to make creativity an inevitable source of calm. * **Clarity & Permission:** A clear map to identify your "Fixed Self" and the courage to gently unfurl from it. **✨ This is for You if:** * You feel mentally "stuck" or confined by your routines. * You've ever said, "I'm not a creative person." * You long for more playfulness, less pressure in your daily life. * You desire to use creativity as a tool for well-being, not just output. * You are 18+ years of age. \*\* Workshop Details:\*\* * **Duration:** 90 minutes * **Format:** Live, interactive virtual session (Link provided upon registration) * **Investment:** €7 less 15% off through 1 March * **What You Need:** A quiet/comfortable space, a willingness to be gently curious, and one ordinary object within arm's reach (a pen, a cup, a book). **(Tickets + event access exclusively available through EventBrite.)** Full event link here [From Fixed to Flow - EventBrite](https://www.eventbrite.nl/e/from-fixed-to-flow-an-online-workshop-of-creativity-and-release-tickets-1981557382473?aff=oddtdtcreator)

Join us for a night of fun and games at our local community center! What to Expect: * Free entrance for everyone! * Bring your favorite games * Meet new friends and gaming enthusiasts * A night of exciting challenges and friendly competition * Bring your own snacks and refreshments Whether you're a board game aficionado or a video game guru, this event is for you. Don't miss the chance to connect with fellow gamers in our community! This event is part of an ongoing series organized through our Discord server [[discord.gg/utrecht](http://discord.gg/utrecht)], where we've had the pleasure of hosting quite a couple of gatherings in the past. Whether you're a seasoned regular at our events or someone new to the scene, we're excited to welcome you.

JULIANALAAN 100 park Angerenstein ( Entrance )

Christians in Tech is a community at the intersection of faith and technology. Our meetups are designed to spark meaningful conversations, promote knowledge sharing, and encourage growth—both in your career and your spiritual walk with God. Whether you're an experienced professional or just starting your tech journey, CIT welcomes you. Our Website [https://linktr.ee/citcbus](https://linktr.ee/citcbus) Sponsors and Partners * Improving (Venue Sponsor) * Bethel World Prayer Center (Fiscal Sponsor) * Fruits & Roots (Coffee Partner)

Bring your Raspberry Pi, Arduino, microcontroller, or any other electronic project and join fellow electronics makers for a night of creativity and collaboration! This session is open forum to share your current projects—whether complete or in progress, it’s all interesting! Whether you’re deep into embedded systems, exploring new ideas, or just getting started, you’ll find a welcoming space to collaborate, share, and get inspired. **New to electronics or curious about tinkering?** You’re absolutely welcome. If you’re a beginner and want to experiment, I’ll have a couple of starter kits available so you can try things out—whether that’s blinking your first LED, putting something on a display, or experimenting with simple sensors. No pressure and no experience required—just an interest in learning and building. While we continue to pursue a more permanent venue for this Meetup, we’ll be using public library facilities based on availability. This session will be at the Worthington Park Library in the Olentangy Meeting Room.

We will show a variety of methods for building agents that run in Microsoft Foundry. This covers the different types of agents: Prompt, Multi, and Hosted, as well as the development lifecycle using evals and traces.

If you are interested in selecting investment choices for your 401(k) or other workplace savings plan, minimizing your income tax liability, or identifying the most effective investments for your brokerage account, we are the group for you. We are a local chapter of Bogleheads**®**, whose investment strategy can be found here: https://www.bogleheads.org/wiki/Bogleheads%C2%AE_investment_philosophy Or you can peruse the Boglehead forum here: https://www.bogleheads.org/index.php I look forward to seeing you there. Mark Vonder Haar

Join other experienced and aspiring agile coaches and professionals to: * develop and practice your coaching skills in a peer-to-peer environment * share current successes and challenges in your work environment and get support from each other * learn from each other, build better relationships and experiment with new ideas

Christians in Tech is a community at the intersection of faith and technology. Our meetups are designed to spark meaningful conversations, promote knowledge sharing, and encourage growth—both in your career and your spiritual walk with God. Whether you're an experienced professional or just starting your tech journey, CIT welcomes you. Our Website [https://linktr.ee/citcbus](https://linktr.ee/citcbus) Sponsors and Partners * Improving (Venue Sponsor) * Bethel World Prayer Center (Fiscal Sponsor) * Fruits & Roots (Coffee Partner)