Computer-Aided Nonlinear Control System Design

SOLIDWORKS Design工程圖培訓教材是依據DS SOLIDWORKS公司所出版的《SOLIDWORKS Design Drawings》編譯而成的書籍，本書著重於介紹使用SOLIDWORKS軟體建立工程圖和平面圖的基本方法和相關技術。 本套教材不但保留了英文原版教材精華和風格基礎外，同時也按照台灣讀者的閱讀習慣進行了編譯審校，最適合企業工程設計人員和學校相關專業師生使用。 本書著重於介紹使用SOLIDWORKS軟體建立工程圖和平面圖的基本方法和相關技術。本套教材不但保留了英文原版教材精華和風格基礎外，同時也按照台灣讀者的閱讀習慣進行了編譯審校，最適合企業工程設計人員和學校相關專業師生使用。

Oh no! Your robot is going wrong. You need to feed it, quickly!But what do robots eat? Find out by turning the wheel in this funny book for toddlers and young children.Will it like shoelaces? Too tangly! Cheesy puffs? Too crumbly! Nuts and bolts, computer cookies and engine oil are what it needs.See different reactions from the robot as you turn the wheel, until you find the food that hits the spot.- Perfect for 2+- Easy to turn wheel- Silly foods for unstoppable giggles

本書以「設計為善」為核心，探討視覺傳達設計如何回應當代社會議題，傳遞公共善意與倫理思考。透過議題導向與符號轉譯的創作策略，將新聞事件轉化為具行動力的視覺語言，完成30件系列作品，涵蓋人權、環境與教育等主題。書中建構一套可實踐、可教學的設計方法，展現設計作為社會介入的可能性。This book centers on the concept of “Design for Good,” examining how visual communication design can respond to contemporary social issues while conveying public goodwill and ethical reflection. Through an issue-driven approach and strategies of symbolic translation, news events are transformed into actionable visual language, resulting in a series of 30 works addressing themes such as human rights, the environment, and education. The book establishes a design methodology that is both practicable and teachable, demonstrating the potential of design as a form of social intervention.

Boy-inventor Dev and his giant robot bear, Boja, return for a third madcap adventure, in the high-tech, mega-modern city of Prosperity. There's a battle going on for who will control the magical power of flember . .. will Dev and Boja find themselves fighting for the right side?

Turn the wheel to feed your monster in this giggle-inducing novelty bookPlease look after this monster. It's very hungry, so make sure you feed it well! Turn the wheel to feed your monster in this hilarious, interactive book. As you rotate the wheel, different silly food options will appear on the page, and the monster's reaction changes. A giggle-inducing book for young children where they control the action, for endless screen-free fun.

※請確定您所選購之期刊正確無誤，本期為2026年06-07月號　NO.164※※因雜誌到貨日期不一，請於下單時在備註欄填上您欲購買之期號(過期雜誌恕不接受訂購)※※本期號上架時間至2026/07/30※打開理想生活樣貌 走進美感設計日常Design Opens Living從米蘭設計展 看見全球最新空間美學趨勢2026 Milano Design Week漫步嘉義老城區 感受新舊交融的城市風景Chiayi Lives Anew初夏身心療癒提案 找到舒服自在的生活感Summer Restores Balance

Brain Quest Write and Erase: Preschool SkillsBrain Quest Learn to Write: Pen Control, Tracing, Shapes, and MoreBrain Quest Learn to Write: LettersBrain Quest Learn to Write: Numbers

A groundbreaking guide to rejecting the default path and designing your dream life—a life centered aroundThe 5 Types of Wealth. Launch your journey to fulfillment with this transformative system from inspirational writer of “The Curiosity Chronicle” newsletter, speaker, and entrepreneur Sahil Bloom.Harsh truth: You’ve been lied to. Throughout your life, you’ve been slowly indoctrinated to believe that money is the only type of wealth. The reality: Your wealthy life may involve money, but in the end, it will be defined by everything else.InThe 5 Types of Wealth, Sahil Bloom offers a transformative guide for redesigning your life around five types of wealth—Time Wealth, Social Wealth, Mental Wealth, Physical Wealth, and Financial Wealth—that will lead to a durable satisfaction and happiness you can build and maintain across the seasons of your life.Whether you are a recent college graduate, mid-life warrior, or a retiree, this playbook will unlock new levels of freedom and fulfillment, i

A teen social media star learns he can't control everything in this delicious, queer graphic novel adaptation that relocates Jane Austen's Emma to a modern-day high school in Queens, New York. Evan Horowitz has it all: beauty, brains, and a not-so-secret flair for matchmaking! An Insta influencer with a talent for makeup and a taste for romance, he's no stranger to playing cupid for those hopelessly clueless in finding love. So when shy transfer student Natalia shuffles into school one day, Evan can't help but get his hands messy! With so many matches to choose from, it's not long before he sets a plan in motion for Natalia--much against the better judgement of his level-headed best friend, Davi. But he takes things too far, creating a web of drama that spirals out of his control. Can Evan learn to put the people closest to him before his misguided ambition? Or will he lose them and his own chance at romance, too?

本書特色1.讓初學者：紮紮實實的學好AutoCAD 2D基礎，靈活發揮於設計&繪圖上。2.讓熟手們：迅速有效的熟悉AutoCAD 2D精華，大大的提昇效率與品質。3.讓講師們：更加精確的掌握AutoCAD 2D技巧，讓教學上更有信心、更遊刃有餘。4.所有讀者：循序漸進的累積AutoCAD 2D實力，順利通過AutoCAD技能檢定。5.疑難雜症：歡迎到翔虹「AutoCAD線上教學課程論壇」來充電、練功與交流。6.線上教學：歡迎加入最物超所值的AutoCAD線上教學 www.autocad.com.tw。內容簡介 【本書序】電腦只是工具，人腦才是主導。資訊化社會必須全民使用電腦，各行各業電腦化不但需要優秀的專業人員開發一流電腦軟、硬體，更要熟悉電腦技能的人來操作。在工商業領域中，圖是一種世界性的語言，透過電腦輔助製圖（Computer Aided Design）的運用，更能有效率地處理並傳播各式各樣複雜圖面以滿足各個領域的需求。身處產業競爭的時代，只有利用有效工具快速提高生產力的企業經營者，才能提升競爭力，開創新的經營局面。電腦技能基金會為因應此趨勢的來臨，辦理各項電腦技能測驗、競賽等相關活動，並藉著相關書籍的出版，提供有心想學好各項電腦技能的朋友，一個合適的管道。AutoCAD自推出以來，廣受各界的好評，這次AutoCAD 2025的推出可說是Autodesk公司繼AutoCAD 2024之後，又一次劃時代之作，不只它的作業環境與操作界面更為友善與便捷，更包含了許多針對全球AutoCAD使用者的需求建議所加入的新指令及強化功能。我們誠摯地感謝吳永進和林美櫻二位作者，以其多年的教學與實務經驗，並在電腦技能基金會的策劃下，為讀者編寫這本「TQC+ AutoCAD 2025特訓教材-基礎篇」，相信這本書可以成為CAD學習者的最佳選擇，誠如作者所說：「用心學習AutoCAD 2025期許新手快速成為CAD專業工程師，期許AutoCAD 2009~2023、2024老手如虎添翼，功力更上一層樓。」若是讀者在經過一段時間的學習之後，想了解自己對本書之觀念及繪圖技巧的掌握以及個人電腦輔助製圖能力之提升狀況，可以繼續使用本會所出版之「TQC+ 電腦輔助平面製圖認證指南」，並歡迎參加本會所舉辦的「TQC+ 工程設計領域 電腦輔助平面製圖認證」，不但能肯定自己，使自己更

In this thrilling conclusion to the Book of Tea YA duology, a young tea-maker may be the only one who can stop an evil darkness from spreading throughout her homeland.A great evil has come to the kingdom of Dàxi. The Banished Prince has returned to seize power, his rise to the dragon throne aided by the mass poisonings that have kept the people bound in fear and distrust.Ning, a young but powerful shénnóng-shi—a wielder of magic using the ancient and delicate art of tea-making—has escorted Princess Zhen into exile. Joining them is the princess's loyal bodyguard Ruyi and Ning's newly healed sister, Shu. Together the four young women travel throughout the kingdom in search of allies to help take back Zhen's rightful throne.But the golden serpent still haunts Ning's nightmares with visions of war. An evil far more ancient than the petty conflicts of men has awoken, and all the magic in the land may not be enough to stop it.

Key Words: Action, Movement, Control. Different areas of the brain dodifferent things - the frontal lobe turns your thoughts into actions. Dailyactions like walking or swinging on the trapeze happen when the frontal lobetells your body to get moving, so get your fingers flying on this puzzle.

地球文明存在著東、西兩個文明波，因為「地球轉動」的緣故，帶動文明波消長，各以約八百年為一個周期，交替循環，二者合計約一千六百年形成一個周期。林英臣先生以「文明波周期」（Civilization Cycle）、「社會系統」（Social System）的「文明法則史學」分析中國各朝代的興亡，書成《中國文明興亡史》，從西周到中華人民共和國的成立。他認為一個「社會系統」（Social System）大約四百年，並分析其a、b、c、d、e、f、g點，a為「創造起始點」、b至c為「成長期」，c、d、e為「高峰（原）期」，e為「衰弱開始點」，f為「續衰點」，g為「滅亡點」。但也可能出現Double Social System，例如西漢、東漢；北宋、南宋。

Paul Colbert's French village has been under Nazi control for years. His Jewish best friend has disappeared. Food is scarce. And theredoesn't seem to be anything Paul can do to make things better.

Find out about the science of the solar system and beyond with hilarious cartoon stripsFind out about the science behind the solar system, the big bang, gravity, black holes and much more with hilarous cartoon strips, facts and diagrams.Each spread in this series features a short, funny comic strip that explains a process or aspect of science. Around the strip, diagrams and panels give further information on the topic. They are a fantastic way to engage children aged 8 plus with science.The illustrator, Jess Bradey, is winner of the 2021 Blue Peter Award for Best Non-Fiction for A Day in the Life of a Poo, Gnu and You and also writes and draws for The Phoneix Comic.Titles in the series: Biology, Chemistry, Earth and Space, Physics.

【本書序】電腦只是工具，人腦才是主導。資訊化社會必須全民使用電腦，各行各業電腦化不但需要優秀的專業人員開發一流電腦軟、硬體，更要熟悉電腦技能的人來操作。在工商業領域中，圖是一種世界性的語言，透過電腦輔助製圖（Computer Aided Design）的運用，更能有效率地處理並傳播各式各樣複雜圖面以滿足各個領域的需求。身處產業競爭的時代，只有利用有效工具快速提高生產力的企業經營者，才能提升競爭力，開創新的經營局面。電腦技能基金會為因應此趨勢的來臨，辦理各項電腦技能測驗、競賽等相關活動，並藉著相關書籍的出版，提供有心想學好各項電腦技能的朋友，一個合適的管道。AutoCAD自推出以來，廣受各界的好評，這次AutoCAD 2024的推出可說是Autodesk公司繼AutoCAD 2023之後，又一次劃時代之作，不只它的作業環境與操作界面更為友善與便捷，更包含了許多針對全球AutoCAD使用者的需求建議所加入的新指令及強化功能。我們誠摯地感謝吳永進和林美櫻二位作者，以其多年的教學與實務經驗，並在電腦技能基金會的策劃下，為讀者編寫這本「TQC+ AutoCAD 2024特訓教材-基礎篇」，相信這本書可以成為CAD學習者的最佳選擇，誠如作者所說：「用心學習AutoCAD 2024期許新手快速成為CAD專業工程師，期許AutoCAD 2009～2022、2023老手如虎添翼，功力更上一層樓。」若是讀者在經過一段時間的學習之後，想了解自己對本書之觀念及繪圖技巧的掌握以及個人電腦輔助製圖能力之提升狀況，可以繼續使用本會所出版之「TQC+ 電腦輔助平面製圖認證指南」，並歡迎參加本會所舉辦的「TQC+ 工程設計領域 電腦輔助平面製圖認證」，不但能肯定自己，使自己更有信心，亦能幫助自己在眾多的競爭者當中脫穎而出。財團法人中華民國電腦技能基金會董事長 杜全昌

Filled with simple, black-and white pictures including a unicorn, a rocket and a rainbow and many more. Just use the brush provided to sweep water over the designs and vibrant colours magically appear! Great for keeping little ones busy and helping them learn brush control skills at the same time. Simply tuck the waterproof back flap under each page as it's painted, to stop water from seeping through to the rest of the book.

Finn has always loved going to stay with his grandma . . .until one day, he tells a little fib that gets out of control! A book about telling the truth, from the bestselling author of the Big Bright Feelings series. Be open, be honest, be you! Big Bright Feelings for little people. When Finn accidentally breaks his grandma's precious clock, he tells a teeny tiny little lie - and blames it on his sister instead! Soon, Finn's little fib is OUT OF CONTROL, and it's getting in the way of everything! Can he find a way to tell the truth?This reassuring and humorous book is the perfect springboard for talking to children about the importance of honesty.Tom Percival's Big Bright Feelings series is the ideal starting point for discussions about mental and emotional health, positive self-image, building self-confidence and managing feelings. Every child's bookshelf should contain his books. Also available in the Big Bright Feelings series: Ruby's Worry, Perfectly Norman, Ravi's Roar, Meesha Make

NEW YORK TIMES BEST SELLER! The blockbuster danmei/Boys' Love novels from China that inspired the animated Scumbag System series streaming in English! A man reborn as a villain in a fantasy novel series ends up accidentally romancing the male protagonist in this fan-favorite tale. Don't miss this final book (Volume 4), which contains bonus stories that explore the past and future of beloved characters! What happens after an epic tale ends? This collection of eleven bonus stories picks up days after the end of Volume 3, and follows adventures and relationships into the future...and back into the past. Readers also get a glimpse into another world, where Luo Binghe was never saved by his beloved teacher--unless he can claim this world's Shen Qingqiu for himself. Other tales recount the riotous history of fan favorites Shang Qinghua and Mobei-Jun, the bittersweet romance of Luo Binghe's parents, and the untold tragedy of the original scum villain himself. FINAL VOLUME

Little transport enthusiasts will love this boxed set of eight simple jigsaws and a book about trucks. Each sturdy jigsaw comes in two easy-to-match pieces, while the 24-page book is perfect for reading together. Featuring eight terrific trucks, from a car transporter to a fire truck.Great for keeping little ones busy and helping them develop problem solving and finger control skills.

New threats, new foes...and a new partner?! This hilarious, action-packed spy series―from the creator of Bird & Squirrel―is perfect for readers who love funny crime-fighting stories like The InvestiGators, The Bad Guys, and Dog Man!Agent 9 is back in action at the Super-Secret Spy Service, and it couldn’t come at a better time. The next assignment? Stopping the Wolf, a cunning canine who’s been hired by the sinister organization DiViSiON to hunt down the final pieces of a mind-control device. It’s a mission of such paramount importance that Nine must do the unthinkable―work with a partner! S4 teams up Agent 9 with Traps, a mouse who specializes in covert operations (and knitting too). Unfortunately, the partnership gets off to a rocky start. And despite their best efforts, the Wolf always seems to be one step ahead. With time running out and DiViSiON’s plans to take over the world nearly complete, can Nine overcome the toughest challenge yet: being part of a team?

電腦只是工具，人腦才是主導。資訊化社會必須全民使用電腦，各行各業電腦化不但需要優秀的專業人員開發一流電腦軟、硬體，更要熟悉電腦技能的人來操作。在工商業領域中，圖是一種世界性的語言，透過電腦輔助製圖（Computer Aided Design）的運用，更能有效率地處理並傳播各式各樣複雜圖面以滿足各個領域的需求。身處產業競爭的時代，只有利用有效工具快速提高生產力的企業經營者，才能提升競爭力，開創新的經營局面。電腦技能基金會為因應此趨勢的來臨，辦理各項電腦技能測驗、競賽等相關活動，並藉著相關書籍的出版，提供有心想學好各項電腦技能的朋友，一個合適的管道。AutoCAD自推出以來，廣受各界的好評，這次AutoCAD 2023的推出可說是Autodesk公司繼AutoCAD 2022之後，又一次劃時代之作，不只它的作業環境與操作界面更為友善與便捷，更包含了許多針對全球AutoCAD使用者的需求建議所加入的新指令及強化功能。我們誠摯地感謝吳永進和林美櫻二位作者，以其多年的教學與實務經驗，並在電腦技能基金會的策劃下，為讀者編寫這本「TQC+ AutoCAD 2023特訓教材-基礎篇」，相信這本書可以成為CAD學習者的最佳選擇，誠如作者所說：「用心學習AutoCAD 2023期許新手快速成為CAD專業工程師，期許AutoCAD 2009～2021、2022老手如虎添翼，功力更上一層樓。」若是讀者在經過一段時間的學習之後，想了解自己對本書之觀念及繪圖技巧的掌握以及個人電腦輔助製圖能力之提升狀況，可以繼續使用本會所出版之「TQC+ 電腦輔助平面製圖認證指南」，並歡迎參加本會所舉辦的「TQC+ 工程設計領域 電腦輔助平面製圖認證」，不但能肯定自己，使自己更有信心，亦能幫助自己在眾多的競爭者當中脫穎而出。

The link between corporate social responsibility and financial performance in Taiwan：A non-linear approachCognitive complexity, stylistic innovation and performance： A preliminary study of small taiwanese design firmsA bibliometric analysis on emerging technology research and development

Learn through play with TinkerActive Early Skills Workbooks―an exciting expansion of the groundbreaking TinkerActive workbook series, with format innovations perfect for learners ages 3 and up!TinkerActive Early Skills workbooks are curriculum-based hands-on fun, perfect for your littlest learners! Each Early Skills workbook is:Created with AWARD-WINNING TEACHERSPacked with STEM ACTIVITIESFilled with TINKERING, CRAFTING, & ENGINEERING projectsLoaded with STICKERS and a FOLD-OUT REWARD POSTERComplete with a WRITE-AND-WIPE game board and activities, so kids can PRACTICE AND PLAY AGAIN AND AGAIN.And even includes EASY AND PRACTICAL TIPS on how to engage your little tinkerer in learning.For ages 3 and up, this workbook covers: Pencil Control, Crayon Control, Letter Recognition, Tracing Uppercase Letters, Alphabetical Order, Letter Sounds, Early Vocabulary

Blast through the galaxy to our own solar system and explore the mysteries of space to a rocking beat. Packed with educational endnotes about space exploration and more. A QR code on the book provides access to video animation and audio.

Fabric for Fashion: The Complete Guide is the only book specifically for fashion designers to explain the behavior, properties and sustainability of different fabrics. Fashion design is largely determined by how fabrics work, move, feel and look. The most successful fashion designers are those who understand their materials, who match design skill with technical knowledge. They also need to understand the ethical and environmental impacts of their fabric choices. This new edition covers both natural and manmade fibers and the latest innovations in the fields of smart textiles and biofabricated materials.

本書為暢銷書World of Science系列書中的特別版。A* STAR(新加坡科技研究局)的科學家Germaine Yong，想像一個名叫Guss年輕細菌，在人類消化系統中經歷了一場神奇的歷險，透過書中生動有趣的漫畫，使小讀者能夠了解我們的消化系統，跟著Guss一同冒險並學習如何保持健康！書中除了輕鬆活潑的全彩漫畫，最後還搭配相關英文詞彙填字遊戲，本書適合所有年齡層的讀者，讓我們一起了解人體的奧妙!*本書互動功能需依書中說明下載APP(Snap Learn)後使用。In this Special Edition comic book in the bestselling World of Science series, A* STAR scientist Germaine Yong imagines the human digestive system as an exciting journey for a young bacteria named Guss. Learn about the ins and outs of our digestive system and how to stay healthy, while having fun with Guss. And, augmented reality features will bring Science learning to life and engage readers of all ages!

本書為暢銷書World of Science系列書中的特別版。A* STAR(新加坡科技研究局)的科學家Germaine Yong，想像一個名叫Guss年輕細菌，在人類消化系統中經歷了一場神奇的歷險，透過書中生動有趣的漫畫，使小讀者能夠了解我們的消化系統，跟著Guss一同冒險並學習如何保持健康！書中除了輕鬆活潑的全彩漫畫，最後還搭配相關英文詞彙填字遊戲，本書適合所有年齡層的讀者，讓我們一起了解人體的奧妙!*本書互動功能需依書中說明下載APP(Snap Learn)後使用。In this Special Edition comic book in the bestselling World of Science series, A* STAR scientist Germaine Yong imagines the human digestive system as an exciting journey for a young bacteria named Guss. Learn about the ins and outs of our digestive system and how to stay healthy, while having fun with Guss. And, augmented reality features will bring Science learning to life and engage readers of all ages!

Walk on the Moon, stop off at the International Space Station and discover the planets in a journey through our solar system. With five cosmic pop-ups, you will find your inner astronaut as you go on your first space adventure.

Boy-inventor Dev and his giant robot bear, Boja, return for a third madcap adventure, in the high-tech, mega-modern city of Prosperity. There's a battle going on for who will control the magical power of Flember . . . will Dev and Boja find themselves fighting for the right side?

After her excitement spins out of control in slapstick comedic scenes kids will love, an energetic young girl discovers how to calm down and be present in the moment.Meena is excited to visit Dada and

Fred the dinosaur spends all his time cooped up indoors, playing computer games. Can his friends drag him away from his screen and persuade him that there's just as much fun to be had outside? This ad

Modern power and energy systems are characterized by the wide integration of distributed generation, storage and electric vehicles, adoption of ICT solutions, and interconnection of different energy carriers and consumer engagement, posing new challenges and creating new opportunities. Advanced testing and validation methods are needed to efficiently validate power equipment and controls in the contemporary complex environment and support the transition to a cleaner and sustainable energy system. Real-time hardware-in-the-loop (HIL) simulation has proven to be an effective method for validating and de-risking power system equipment in highly realistic, flexible, and repeatable conditions. Controller hardware-in-the-loop (CHIL) and power hardware-in-the-loop (PHIL) are the two main HIL simulation methods used in industry and academia that contribute to system-level testing enhancement by exploiting the flexibility of digital simulations in testing actual controllers and power equipment.

Arise! Once dubbed the Weakest Hunter of All Mankind, Jinwoo is now...well, something else entirely. Armed with his mysterious system, he’s currently powerful enough to single-handedly clear dungeons that once would have proven life-threatening. He just has to ready himself to take on the Demon’s Castle - and what better way to do so than finishing a quest? Exclusive new weapons and skills from an assassin-class job may be just what Jinwoo needs...but the system seems to have other plans for him!

Push, pull and slide the tabs to get to work in Busy Diggers! Scoop up dirt, clear rubble and control mighty metal machines in this fun book about diggers and everything they do at the building site.

From the author of the Outline trilogy, a fable of human destiny and decline, enacted in a closed system of intimate, fractured relationships.A woman invites a famed artist to visit the remote coastal

吃進肚子的東西，到底經歷了什麼神奇旅程？跟著一位腸道裡的「好菌導遊」，你將探訪人體消化系統：嘴巴怎麼開始消化？胃為什麼會咕嚕叫？還有肝臟、腸道、腺體和許多你可能從沒想過的器官祕密！這本圖像式科普漫畫以幽默畫風和誇張情節，讓讀者一邊大笑、一邊認識身體運作機制。Chew on this! Science Comics: The Digestive System is the latest volume in First Second’s action-packed nonfiction graphic novel series for middle-grade readers!Every volume of Science Comics offers a complete introduction to a particular topic―dinosaurs, the solar system, volcanoes, bats, robots, and more. These gorgeously illustrated graphic novels offer wildly entertaining views of their subjects. Whether you're a fourth grader doing a natural science unit at school or a thirty-year-old with a secret passion for airplanes, these books are for you!In this volume, visit the inside of your mouth, stomach, liver, intestines, and other organs that make up the gastrointestinal tract! Your guide to the gut is a friendly bacterium who will take you on a journey beyond imagination. Uncover how food is transformed into nutrients! Explore strange and dangerous glands

Rob Ryan is a star of the London arts and crafts scene whose work has succeeded thus far both as fine artwork and as commercial art, design and decoration. His work is irresistibly bright and colorful, and will find universal appeal as a gift book. He will also find an audience in art and design categories, where his artwork is appreciated alongside illustrators like Jean-Philippe Delhomme or Jean Julien, and his commercial work is aligned with such colorful names as Paul Smith, Lulu Guinness, and Liberty of London.The first monograph celebrating the jubilant and romantic artwork of the beloved East London paper-cut artist Rob Ryan.

*series focuses on positive social development of young children*books offer support through a variety of childhood experiences*sharing theme*pull tabs show a resolution that is reassuring to children and affirms positive behavior*pull tabs also provide encouragement and remind chidlren that they can control what happens in differet situations

Are you looking for happiness? Sometimes it can feel really far away, and sometimes you might have so much you can’t help but share. You can try to chase it, control it or capture it, but even if it s