![]() Hell is described as a place of fire and torment. Abraham lives in the seventh Heaven in a place made of divine light. ![]() The first Heaven is made of silver and is where Adam and Eve live. Each Heaven is made of a different material, and a different prophet lives in each Heaven. Muslims believe there are seven levels of Heaven, although “seven” is interpreted by some Muslims as simply “many”. Therefore, obeying the rules set by Allah is of ultimate importance. These good actions will be rewarded on the Last Day. ![]() Muslims believe they get to Paradise by living religiously, asking Allah for forgiveness and showing good actions in their life. It is described in the Qur’an as “gardens of pleasure” (Qur’an 31:8). Jannah is Paradise, where those who have been good go. In doing so, he echoed Osama bin Laden’s characterisation of the west, sparking immense controversy.Heaven is described in the Qur’an as a beautiful garden. Meanwhile, in the west, there is an entirely different cultural memory of the crusades – highlighted by US President George W Bush when, after the 9/11 attack, he described the American-launched military campaign dubbed the ‘war on terror’ as “a crusade”. The caliphate was controlled by various dynasties until its abolition in 1924. Sunni Muslims believe that such a leader should be chosen by election Shia adherents believe that the Muslim leader should be a descendant of the Prophet’s cousin Ali. At its greatest extent, the Fatimid caliphate spanned Syria and the Holy Land but by the 12th century it was in decline, and was ousted by Saladin in 1171.Ī caliphate is an Islamic state ruled by a caliph – literally a ‘successor’ of the Prophet Muhammad – the religious and legal leader of the community of believers. In 969, the Fatimids took control of Egypt and founded Cairo. The leader of the Fatimid dynasty, which emerged in north Africa at the start of the 10th century, was regarded by Shia Muslims as the successor to the Prophet, and rightful spiritual leader of the Muslim community. Who were the Fatimids and what is a caliphate? In addition, military defeats at the battles of Montgisard (1177), Acre (1189), Arsuf (1191) and Jaffa (1192) also attracted periodic criticism from Muslims, but such were his diplomatic skills – bolstered by the largely unwavering loyalty of his own family – that these setbacks did not terminally damage his cause. Though the former aim was certainly endorsed by all Muslims, he attracted a lot of criticism for usurping the Zengid dynasty in Syria. Saladin was undoubtedly set upon liberating Jerusalem for Islam, but inextricably linked to this was his determination to create a powerful dynastic empire. In the course of his career, the sultan spent many years in conflict with his Sunni Muslim co-religionists. It is, though, important to recognise that not all Muslims revere, or have revered, Saladin. Multiple forms of resistance emerged, including strikes and boycotts. Demonstrations frequently became violent: protestors threw objects at Israeli troops, who responded with gunfire Palestinians later also used guns. This Palestinian uprising against Israeli rule erupted in Gaza in 1987 and soon spread into the West Bank territories. And though he undoubtedly benefitted from a cadre of eloquent and persuasive literary admirers, the evidence from those beyond his inner circle – even the writings of his enemies – indicates the prominence of these personality traits, and demonstrates that they were central to his success as the leader of the jihad against the Franks, and as a dynastic empire-builder. Over the course of his lifetime, Saladin became famous for his generosity, piety, justice and mercy. Though the victory at Jerusalem is at the heart of his renown, Saladin’s character – or the image formed around his character – is also immensely important. His story is woven into the political, religious and cultural landscape as the man who defeated invading westerners and fought for his faith and his people. Over 800 years later, the sultan commands an extraordinarily enduring reputation across the Muslim world. Following his triumph in this clash againast the crusaders, the sultan captured the holy city of Jerusalem in October 1187 (Heritage Images/Getty Images) Saladin captures the 'true cross' at the battle of Hattin on 4 July 1187, depicted in a medieval illustration.
0 Comments
It also encrypts your internet traffic, so no one else can see what you’re up to on the internet.ĬyberGhost VPN has a dedicated app for iPhones. It hides your IP address, meaning no one can trace your online activities back to you. What Is a VPN on an iPhone?Ī Virtual Private Network (VPN) is just a piece of software that keeps you safe and secures your data on the internet. You have to encrypt all your internet traffic with a reliable VPN like CyberGhost if you want to keep your data safe from your ISP or any irrelevant third party. You’ll be in for a not-so-pleasant surprise if the iPhone’s built-in security features are your only line of defense. In short, your iPhone isn’t as impenetrable as Apple wants you to believe. The result? Many apps that should be end-to-end encrypted are, in fact, not! Sure, Apple has strict security rules for its apps, but that doesn’t mean all iOS developers always follow them accurately. Research even found that more iOS apps had security loopholes that could be exploited by malicious users as compared to Android apps. So much for transparency, huh? Later, in 2019, Google discovered 14 security flaws and even developed exploit chains to demonstrate how cybercriminals were taking advantage of the flaws and stealing user data for years while Apple had no idea. Back in 2015, cybercriminals hacked Apple and got access to 128 million iPhone users. You’re just as vulnerable on the internet as any Android user.Įven the encrypted data that your iPhone sends to Apple’s servers isn’t safe once it’s stored on those servers. Your browsing sessions, IP address, and pretty much everything you do online is out in the open for ISPs (internet service providers), advertisers, cybercriminals, and digital spies. With iOS, they can’t access the source code, and Apple’s limited internal team can’t always outpace cybercriminals in finding those flaws.Īs for encryption, iOS encryption protects your passwords and personal data on your iPhone along with the traffic your iPhone sends back to Apple’s servers. The keen eyes of millions of open source contributors can detect code vulnerabilities that original developers may have overlooked. Sadly, the open source community – developers who contribute to the code by adding features or making it more efficient – can’t speculate on iOS’s source code either. It also means cybercriminals can’t find and exploit security loopholes in iOS as easily as they can in Android which is open source. That means they can’t introduce security flaws to the original code. Developers, device manufacturers, and end-users can’t modify its source code themselves. ![]() Apple’s iOS has maintained its reputation for being a more secure OS than Android because Apple’s iOS is a closed platform. IPhones aren’t just popular for being a status symbol. The Truth Behind Apple’s Ironclad Security Features Using a premium VPN like CyberGhost on your iPhone prevents third parties and spyware from tracking your information. You can’t solely rely on the built-in security and privacy features of the iPhone. ![]() If you are using jpa entity to map database tables to models, you can use javax.persistence. String json = objectmapper.writevalueasstring(car) ![]() if you had a car model with list field then model to json string conversion is straight-forward using jackson-objectmapper like:Ĭonverting car model object to json string: objectmapper objectmapper = new objectmapper() Ĭar.car_type = arrays.aslist("modela", "modelb", "modelc") In this tutorial, you have learned how to use the MySQL CAST() function to convert a value with any type into a value with a specified type.There, i feel your problem is trying to map a string column of a table entity to a list model field. Convert to int in mySql Ask Question Asked 1 year, 4 months ago Modified 1 year, 4 months ago Viewed 691 times 0 I'm trying to convert a number to int without any success MySQL: select cast (int, 12.345) select cast 12.345 as int select convert (12.345, int) and more variations of the above 2 functions - failing at all. ![]() | 1968 Ford Mustang | Prices(95.34,194.57) | SELECT FROM pro WHERE fldcustom1 < cast (param as unsigned) When fldcustom1 is of a number data type then MySQL will automatically convert the string parameter to a number to make the comparision. if so you can use the cast operator on Column. | 1969 Harley Davidson Ultimate Chopper | Prices(48.81,95.70) | You can get it as Integer from the csv file using the option inferSchema like this : val df ('inferSchema', true).csv ('file-location') That being said : the inferSchema option do make mistakes sometimes and put the type as String. The following statement converts DOUBLE values into CHAR values and uses the results as the arguments of the CONCAT function: SELECT productName,įROM products Code language: SQL (Structured Query Language) ( sql ) Try It Out +-+-+ģ rows in set (0.03 sec) Code language: JavaScript ( javascript ) If you order a string column that contains only numeric values with MySQL, it will order them as string values, e.g. CONVERT function to convert int to string CONVERT is similar to CAST, the SELECT CONVERT syntax is a little different, but the result is the same. RequiredDate BETWEEN CAST( '' AS DATETIME)ĪND CAST( '' AS DATETIME) Code language: SQL (Structured Query Language) ( sql ) MySQL: order a string column as an integer. To ensure safety, you can use the CAST() function to explicitly convert a string into a TIMESTAMP value, as follows: SELECT RequiredDate BETWEEN '' AND '' Code language: SQL (Structured Query Language) ( sql )īecause the data type of the requireDate column is DATE, MySQL has to convert the literal strings: '' and '' into TIMESTAMP values before evaluating the WHERE condition. The following query retrieves the orders whose required dates are in January 2003: SELECT Let’s take a look at the orders table in the sample database: +-+ġ row in set ( 0.00 sec) Code language: PHP ( php ) 2) Using MySQL CAST function with table data examples | CONCAT( 'MySQL CAST example #',CAST( 2 AS CHAR)) | ![]() The following statement explicitly converts an integer into a string and concatenates the string with another string: SELECT CONCAT( 'MySQL CAST example #', CAST( 2 AS CHAR)) Code language: SQL (Structured Query Language) ( sql ) To explicitly convert a string into an integer, you use the CAST() function as the following statement: SELECT ( 1 + CAST( '1' AS UNSIGNED))/ 2 Code language: SQL (Structured Query Language) ( sql ) In the following example, MySQL converts a string into an integer implicitly before doing a calculation: SELECT ( 1 + '1')/ 2 Code language: SQL (Structured Query Language) ( sql )ġ row in set (0.01 sec) Code language: JavaScript ( javascript ) Let’s take a look at some examples of using the CAST() function. In practice, you often use the CAST() function to return a value with a specified type for comparison in the WHERE, JOIN, and HAVING clauses. The target type can be any one of the following types: BINARY, CHAR, DATE, DATETIME, TIME, DECIMAL, SIGNED, or UNSIGNED. The syntax of the MySQL CAST() function is as follows: CAST(expression AS TYPE) Code language: SQL (Structured Query Language) ( sql ) The target type can be any one of the following types: BINARY, CHAR. The CAST() function allows you to convert a value of one type into another type. The CAST() function converts a value of any type into a value that has a specified type. Summary: in this tutorial, you will learn how to use MySQL CAST function to convert a value of a type into another type. ![]() Giannandrea’s testimony is believed to be of particular importance to the case. iOS 17, however, is now available to the general public, and Apple seems to think the new search option is a key aspect of its deal with Google. This feature largely flew under the radar during iOS 17 beta testing over the summer. You can choose between Google, Yahoo, Bing, DuckDuckGo, and Ecosia. You can find the new option by going to the Settings app, choosing “Safari,” and then looking for the new “Private Search Engine” option. The difference is that you now have that added layer of granular control to set different defaults for both Safari browsing modes. Google is still the default for both of those settings. One of the settings is for normal Safari browsing, while the new second option is specifically for Private Browsing. The DOJ believes that this deal could play a key role in Google’s overall abuse of power in the search industry.Īs reported by Bloomberg, during hearings on Thursday and Friday, Giannandrea pointed out that iOS 17 added a new setting that allows users to choose two different default search engines on their devices. Apple is not named as a defendant in the case, but the multibillion-dollar default search engine deal between it and Google is one of the key aspects of the trial.Īs we’ve covered in the past, Google pays Apple billions of dollars every year to retain its status as the default search engine on iPhone, iPad, and Mac. During his testimony, Giannandrea specifically pointed to a little-known new feature in iOS 17 related to the iPhone’s default search engine.Īpple has found itself involved in the DOJ’s lawsuit, which is focused on whether Google abuses its position in the search engine industry. Under Backed up, the backup status and size of your photo or video displays.John Giannandrea, Apple’s senior vice president of ML and AI strategy, took the stand this week to testify in the ongoing Department of Justice antitrust suit against Google.File upload won't show if we don't know the upload source.For example, "Uploaded from Android device" or "Uploaded from Google Drive." Next to File upload, you'll find which source uploaded your photo or video. ![]() In Google Photos, you can check how you uploaded your photos and videos. If your Apple Photos Library is synced with iCloud, all photos and videos in your library and cloud are backed up to Google Photos on macOS 10.15 and above.Ĭheck where your photos & videos were uploaded from.You can change your System Photo Library in Apple Photos. If you have more than one Apple Photos Library, only the System Photo Library is backed up.Turn on Upload photos and videos to Google Photos.On your computer, open Drive for desktop.If your computer runs macOS, you can back up your System Photo Library to Google Photos. EOS-1D X Mark III, EOS-1D X Mark II, EOS-1D X, EOS-1Ds Mark III, EOS-1Ds Mark II, EOS-1D Mark IV, EOS-1D Mark III, EOS-1D Mark II, EOS-1D C, EOS-1D Mark II N, EOS 5D Mark IV, EOS 5D Mark III, EOS 5D Mark II, EOS 5D, EOS 5Ds, EOS 5Ds R, EOS R5, EOS 6D Mark II, EOS 6D, EOS R6, EOS R, EOS Ra, EOS RP, EOS 7D Mark II, EOS 7D, EOS 90D, EOS 80D, EOS 70D, EOS 60D, EOS 60Da, EOS 50D, EOS 40D, EOS 30D, EOS 20D, EOS 20Da, EOS 9000D (EOS 77D), EOS 8000D (EOS REBEL T6S/EOS 760D), EOS Kiss X10i (EOS REBEL T8i/EOS 850D), EOS Kiss X9i (EOS REBEL T7i/EOS 800D), EOS Kiss X8i (EOS REBEL T6i/EOS 750D), EOS Kiss X7i (EOS REBEL T5i/EOS 700D), EOS Kiss X6i (EOS REBEL T4i/EOS 650D), EOS Kiss X10 (EOS REBEL S元/EOS 250D/EOS 200D II), EOS Kiss X9 (EOS REBEL SL2/EOS 200D), EOS Kiss X7 (EOS REBEL SL1/EOS 100D), EOS Kiss X5 (EOS REBEL T3i/EOS 600D), EOS Kiss X4 (EOS REBEL T2i/EOS 550D), EOS Kiss X3 (EOS REBEL T1i/EOS 500D), EOS Kiss X2 (EOS DIGITAL REBEL XSi/EOS 450D), EOS Kiss X90 (EOS REBEL T7/EOS 2000D/EOS 1500D), EOS Kiss X80 (EOS REBEL T6/EOS 1300D), EOS Kiss X70 (EOS REBEL T5/EOS 1200D), EOS Kiss X50 (EOS REBEL T3/EOS 1100D), EOS Kiss F (EOS DIGITAL REBEL XS/EOS 1000D), EOS Kiss Digital X (EOS DIGITAL REBEL XTi/EOS 400D DIGITAL), EOS Kiss Digital N (EOS DIGITAL REBEL XT/EOS 350D DIGITAL), EOS Kiss M (EOS M50), EOS M6 Mark II, EOS M6, EOS M5, EOS M3, EOS M2, EOS M, EOS M10, EOS M200, EOS M100, PowerShot G9 X Mark II, PowerShot G9 X, PowerShot G7 X Mark III, PowerShot G7 X Mark II, PowerShot G7 X, PowerShot G5 X Mark II, PowerShot G5 X, PowerShot G3 X, PowerShot G1 X Mark III, PowerShot G1 X Mark II, PowerShot G1 X, PowerShot G16, PowerShot G15, PowerShot G12, PowerShot G11, PowerShot G10, PowerShot S120, PowerShot S110, PowerShot S100, PowerShot S95, PowerShot S90, PowerShot SX70 HS, PowerShot SX60 HS, PowerShot SX50 HS, PowerShot SX1 IS ![]() People should also adjust the brightness of their teeth to brighten their smiles. Nothing beats getting the look you want on portraits that will give you complete confidence when posting these photos on social media or creating a profile. Whether you have a lot of dark freckles or red pimples on your face, they can all be erased and blurred to create a beautiful natural skin background. You also don’t have to be concerned about your face being riddled with flaws. We have a pigment modifier for every adjustment, whether brown or white, to help you get the look you want. ![]() With skin color-changing technology, everyone should try to change their style and become bold and more powerful. The makeup artist, using modern technology, offers flexibility in every detail of makeup, allowing each detail to be delicately expressed on everyone’s face.ĬREATE A SHINE FOR THE SKIN COLOR TO MAKE THE FACE FRESH Apply a little red lipstick to your lips to make them look fresher, then widen the corners of your eyes. Furthermore, people should match the color of their brows and hair to achieve the best look. To begin, changing the shape of your brows is simple delete the old brow shape and insert a new one. Our face will gain depth with a few simple steps in the Facetune Editor by Lightricks application, giving us an impressive appearance in various styles. MODERN RETOUCHING TECHNOLOGY FOR FACE MAKEUP With many top-notch makeup applications combined with a highly natural concealer duo, every personality will be clearly expressed on the face. Improving your photos and appearance gives you more confidence in your photographs. The powerful editing tools, including beauty filters, blemish removal, skin smoothing, and lighting adjustments, offer a wide range of options to enhance the appearance of portraits and selfies.Facetune Editor provides a highly detailed and sharp portrait editor for each face. The app provides a user-friendly interface with intuitive features and functionalities, making it accessible to both beginners and more experienced users. Overall, the experience of using Facetune is highly positive for individuals seeking to enhance and transform their photos. However, Like any sophisticated editing application, this app has a learning curve for users who are new to photo editing. ![]() The availability of multiple filters allows you to select your preferred style and add a personal touch to your images. ![]() Each filter possesses unique colors and effects, contributing to the enhancement and beautification of photos. It offers a wide range of filters, including numerous free options that you can explore. Furthermore, the app employs artificial intelligence (AI) to brighten dark areas in photos, utilizing special effects that bring out the best in every image. With this functionality, you can manipulate the lighting to create captivating effects and enhance your facial features. It introduces the remarkable Relight feature, which enables you to alter the direction of light sources within your photos. With just a few taps, you can choose from a variety of filters, lighting options, textures, contrast adjustments, and even add frames to your images. The app provides a diverse range of beauty filters, enabling you to apply edits such as lighting correction, contouring, and other enhancements. Facetune's array of features caters to users looking to refine their photographs and achieve a desired aesthetic. Find out more about Tor and how it works. ![]() onion websites that are only available through Tor. Block website trackers, scripts, and cookies. Onion Browser: Connect directly to Tor and browse the internet privately. SmartDevil 3 Pack Screen Protector for iPhone 14/iPhone 13 / iPhone 13 Pro (6.1 Inch), Easy Installation Frame 10X Military Grade Shatterproof HD Bubble Free Diamonds Hard Tempered Glass Protective Film - Case Friendly.Also, it provides controls to block trackers, private searching with Cliqz, and protection against potential phishing attacks. Package Included: iPhone 13 5G 6.1 - 2 packs privacy glass screen protector & 2 packs camera lens protector with precise laser cutting technology offers maximum screen coverage. Ghostery Private Browser: It started as a browser extension, but Ghostery is now available as a private browser for iOS and Android.It also ditches Google in favor of DuckDuckGo. This anti-spy tempered glass screen film ensures that your screen is. OtterBox Amplify Glass Glare Guard for iPhone 13 Pro. Enhance your iPhone 13s privacy with our Ultra Shield Privacy Screen Protector. DuckDuckGo Privacy Browser: This search engine-turned-browser for iOS and Android blocks all third-party cookies, ranks sites based on their privacy policies, and forces encrypted connection. Hardened and with oleophobic coating, this iPhone 13/Pro privacy screen protector wont break the bank for you. Compatibility Specially designed for iPhone 13 / 13 Pro 6.1-Inch, Perfectly fits your screen and offers great protection to your iPhone Privacy Protection.If you want one that goes even further, though, consider: ![]() However, Safari is respectful of your privacy in a way that should satisfy most users. ![]() Remember, if you use a different browser (like Chrome), these settings won't apply. ![]() In fact, Lund explained, it was a schematic of the state’s water infrastructure, the inflows and outflows, both natural and man-made. Its surface was covered with lines, arrows, symbols, and small blocks of text-a maze-like network that could have passed for the wiring diagram of a nuclear power plant. The sheet was three feet wide and so long that one end drooped almost to the ground. Before we ate our sandwiches, Lund unrolled a laminated sheet on top of our picnic table. Spring was well under way-on our drive to Bethany, we’d passed hundreds of acres of blossoming almond trees with neat stacks of beehives spaced at intervals along the rows, for pollination-but the weather was still cool enough for jackets. Lund is in his sixties, and Moyle is almost eighty. In mid-February, I ate lunch at Bethany Reservoir State Recreation Area, a ninety-minute drive south of Sacramento, with Jay Lund, who is a co-director of the Center for Watershed Sciences at the University of California, Davis, and Peter Moyle, an emeritus professor at the same university. During the past century and a half, miners, farmers, politicians, engineers, conservationists, and schemers of all kinds have worked-together and against one another-to create one of the most complex water-shifting systems in the world. Devising ways to move water from wet places to dry places has been the labor of generations. Most precipitation in California falls in the north, while the biggest users, including all the major metropolitan areas and the immense farms of the San Joaquin Valley, are farther south. But the Sacramento is still important: it and its tributaries make up the state’s single largest source of fresh surface water. Travellers now mostly use I-80 to cover the same ninety miles, and oceangoing ships bound for the Port of West Sacramento finish their trip in a deepwater canal built sixty years ago by the Army Corps of Engineers. Erik Vink, the executive director of the Delta Protection Commission, a state conservation agency, described the Sacramento to me as “California’s first superhighway.” By the eighteen-fifties, daily steamboats ferried passengers between San Francisco and Sacramento in as little as six hours. Shasta, in the northernmost part of the state, and runs some four hundred miles south, draining the upper corridor of the Central Valley, bending through downtown Sacramento, and, eventually, reaching the Pacific Ocean, by way of the San Francisco Bay and the Golden Gate Bridge. Send us feedback about these examples.The Sacramento is California’s largest river. These examples are programmatically compiled from various online sources to illustrate current usage of the word 'submerge.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. 2023 Two years ago, the Nooksack River overflowed its banks, submerging some parts of Whatcom County, Wash., along the Canadian border under multiple feet of water. 2023 They had been basically cleaned up by water from being submerged. 2023 River water levels rose very quickly, increasing to around 15-20 feet higher than normal, said the Army, which added that 41 of its vehicles were submerged under the resulting slush. ![]() 2023 In addition, a drain hole ensures water or other liquids leave the bag if submerged. ![]() 2023 Others submerge the lungs in liquid formaldehyde instead of water. ![]() 2023 Another tactic, available to the lucky few, is to extract heat from a nearby body of water, by submerging piping at some depth in that water. 2023 The car landed on its wheels and, because of high tide, it was partially submerged in water on the beach, the outlet reported. Recent Examples on the Web Last year, floods submerged hundreds of villages in Pakistan, displacing at least 130,000 people and spreading diseases. ![]() The basic ingredients have always been finely ground titanium dioxide and silicates, combined with linseed oil and varnishes. When sanding swedish putty dry, a mask is recommended. With this material and a bit of patience, it is possible to obtain glass-like surfaces by applying very thin coats which are subsequently sanded with a fine grit paper (wet or dry). It is a most unusual filling compound which has been used by European craftsmen since the eighteenth-century to produce spectacular results. ![]() In Northern Europe, this product is referred to as Swedish Putty in France it is more commonly known as Enduit (on-dwee). Surfaces: Plaster, wallboard, wood or metalĪpplications: Walls and ceiling, doors, trim, furniture, and metal or wood cabinets Interior or exterior, oil-based knifing filler skim coat for the perfection of substrates. If additional filling is required, apply second coat and repeat sanding process. DIRECTIONSĪpply a full, even coat, and allow to dry for twelve to sixteen hours before sanding with a palm sander – 200 grit – to a glass-smooth finish. Use an inexpensive natural bristle or synthetic brush.įor the best possible application and easier sanding, it is recommended that Brushing Putty be thinned by 5% with Penetrol. Tools: Do not use a high quality brush for this material. Surfaces contaminated by oil or grease should be cleaned with a solvent. *Brushing Putty must be over-coated with FPE Oil Primer/ Undercoat prior to painting on both Interior and Exterior applications. Brushing Putty will conceal grain patterns effectively even in oak and luan! Brushing Putty is ideal for restoration work as it will serve to fill and conceal minor nicks and dents in all wooden surfaces.īrushing Putty has five times the filling ability of ordinary primer. This primer offers superior filling power and is recommended for use with open-grained wood which will be receiving a Hollandlac or ECO finish. Stores that Carry this Product DESCRIPTIONīrushing Putty is an interior primer which can be easily sanded to a glass-smooth finish. Surfaces: Extremely high-build sanding primerĪpplications: Doors, walls, windows, cabinet work and furniture. Oil-based primer for use on interior or exterior* surfaces. Stores that Carry this Product Available Sizes casien and calcimine paints), and silicone. Weld-Crete® is also used for: bonding setting beds for ceramic tile bonding Portland cement plaster and stucco mixes and to bond to surfaces such as brick, block, tile, marble, metal, glass block, soundly adhered paint (non-soluable in water, i.e. Use Weld-Crete’s® open time to your advantage in bonding to concrete shear walls when you need a time lapse between application of bonding agent, placement of reinforcement steel, placement of formwork and placement of concrete. Weld-Crete® can be “painted on” in a single application 1 hour to 10 days prior to concrete placement. ![]() For exterior and interior use, Weld-Crete® will bond new concrete, Portland cement plaster and cementitious mixes to structurally sound concrete floors, walls, columns, beams, steps and ramps. The original chemical concrete bonding agent, Weld-Crete® incorporates polyvinyl acetate homopolymer in a patented formulation. Weld-Crete® bonds new concrete, stucco, tile setting beds and terrazzo to any structurally sound surface, interior or exterior. Finally, press Flash! and enter your password to write the image to the selected device. ![]() Next, click on Select target and pick the USB device. ![]() ![]()
![]() Several wavefronts are approaching the barrier the ray is drawn for these wavefronts. The diagram at the right depicts such a parabolic barrier in the ripple tank. But what if the surface is curved, perhaps in the shape of a parabola? What generalizations can be made for the reflection of water waves off parabolic surfaces? Suppose that a rubber tube having the shape of a parabola is placed within the water. The discussion above pertains to the reflection of waves off of straight surfaces. This law will be discussed in more detail in Unit 13 of The Physics Classroom. Regardless of the angle at which the wavefronts approach the barrier, one general law of reflection holds true: the waves will always reflect in such a way that the angle at which they approach the barrier equals the angle at which they reflect off the barrier. The diagram below shows the reflected wavefronts and the reflected ray. Upon reaching the barrier placed within the water, these waves bounce off the water and head in a different direction. The blue arrow is called a ray and is drawn perpendicular to the wavefronts. The direction that these wavefronts (straight-line crests) are traveling through the water is represented by the blue arrow. The diagram at the right depicts a series of straight waves approaching a long barrier extending at an angle across the tank of water. These waves will travel through the water until they encounter an obstacle - such as the wall of the tank or an object placed within the water. As viewed on the sheet of paper below the tank, the crests are the dark lines stretching across the paper and the troughs are the bright lines. These straight waves have alternating crests and troughs. If a linear object attached to an oscillator bobs back and forth within the water, it becomes a source of straight waves. Ripple tank demonstrations are commonly done in a Physics class in order to discuss the principles underlying the reflection, refraction, and diffraction of waves. As the waves encounter obstacles in their path, their behavior can be observed by watching the movement of the dark and bright spots on the sheet of paper. As the water waves move through the ripple tank, the dark and bright spots move as well. So the bright spots represent wave troughs and the dark spots represent wave crests. A crest of water will absorb more light than a trough. A portion of light is absorbed by the water as it passes through the tank. A light typically shines upon the water from above and illuminates a white sheet of paper placed directly below the tank. A ripple tank is a large glass-bottomed tank of water that is used to study the behavior of water waves. The study of waves in two dimensions is often done using a ripple tank. But what if the wave is traveling in a two-dimensional medium such as a water wave traveling through ocean water? Or what if the wave is traveling in a three-dimensional medium such as a sound wave or a light wave traveling through air? What types of behaviors can be expected of such two- and three-dimensional waves? Specifically, there will be some reflection off the boundary and some transmission into the new medium. Rather, a wave will undergo certain behaviors when it encounters the end of the medium. The wave doesn't just stop when it reaches the end of the medium. Previously in Lesson 3, the behavior of waves traveling along a rope from a more dense medium to a less dense medium (and vice versa) was discussed. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |