Light diffraction through aperture8/18/2023 (3a) and (3b) for practical computations is a very tedious task. to the specific case of concentric circular apertures and yielded complicated but closed solutions in terms of Lommel functions. □, and ω is the circular frequency of the light. 4, where it is shown that previous attempts to do so have produced dubious results. The modified theory developed in this paper is based on the explicit assumption that the scalar theory of light cannot explain plolarization effects. In the specific case of a diffracting half plane the numerical results obtained were practically the same as those given by Sommerfeld’s rigorous theory. At distances from the aperture which are large compared to the wavelength λ these field expressions are reduced to the usual ones specified by Fresnel’s theory. These results show that the incident geometrical field is modulated by diffraction before it reaches the aperture plane while the reflected field is spilled into the dark space. Algorithms for using the new theory for computing the diffraction patterns of circular apertures and slits at arbitrary distances z from either side of the aperture (down to z = ± 0.0003 λ) are presented, and numerical examples of the results are given. These components are defined as linear combinations of the Rayleigh-Sommerfeld integrals, so that they are rigorous solutions of the wave equation as well as continuously differentiable in the aperture plane. This is remedied by formulating an improved theory in which the field on either side of a semi-reflecting screen is expressed as the superposition of mutually incoherent components which propagate in the opposite directions of the incident and reflected light. 3 it is recalled that for near-zone computations the Kirchhoff or Rayleigh-Sommerfeld integrals are applicable, but fail to correctly describe the energy flux across the aperture plane because they are not continuously differentiable with respect to the assumed geometrical field on the source side. If these precautions are not taken the theory of partial coherence may have to be used for the computations. A quarter-wave criterion is applied to show how such errors can be avoided by placing the source at a large distance from the aperture plane, and it is found that in many cases it may be necessary to use collimated light as on the source side of a Fraunhofer experiment. 2 it is pointed out that all thermal sources used in practice are finite in size and errors can result from insufficient coherence of the optical field. This paper focuses on unresolved or poorly documented issues pertaining to Fresnel’s scalar diffraction theory and its modifications.
0 Comments
That’s a good thing, but it does mean if you run out of supplies, it is a long drive to town. Located near the end of an undeveloped barrier island, the campground feels remote and far from civilization. Located on the eastern side of the road, the campgrounds are a short walk from water on the bay side as well as the spectacular beaches on the Gulf side. (Photo: David Blasco) Gulf Islands National Seashore campingīeach and history lovers will find the setting at the Fort Pickens area campgrounds particularly appealing. I think the freedom to wander the huge spooky fort on your own adds to the thrill, but do hang onto little kids!Īn RV site at the Fort Pickens area in Gulf Islands National Seashore campround. Here, you are free to explore rooms that are dark or dimly lit, tunnels with low ceilings, spaces where water collects and the ground is uneven. It is common to have spaces that are not designed specifically for visitors to be roped off at the slightest danger. Much of it is left in its original condition and one of the curious things is that visitors can just wander this maze of tunnels and arched rooms on their own. It is a massive red brick pentagonal building built before the Civil War. The road ends at the western end of the island at the complex of historic buildings that includes Fort Pickens, which is a remarkable site even for those not interested in military history. Massive Civil War era muzzle-loading cannons atop the fortress wall have a spectacular view at Fort Pickens in Gulf Islands National Seashore. At this point, on the Gulf side of the highway, there is a parking lot and the short Dune Trail. This trail also connects with the Florida Trail, which runs all along Gulf Islands National Seashore, ending at Fort Pickens, 1,300 miles from its start in Big Cypress National wildlife refuge. Military history buffs will want to park and explore.Īt the turn off for the Campground A, there is a half-mile loop Blackbird Marsh Trail with good signage that travels around a pretty wetland. (More on camping below.)Īlong the way, you will pass some portions of the fort, gun batteries once camouflaged with sand and vegetation to hide them from aerial surveillance. On this road, there are three turn-offs for campgrounds, which are attractive lightly wooded compounds across the street from the beach. The Blackbird Marsh Trail near Fort Pickens at Gulf Islands National Seashore was beautiful and had informative signage identifying plants and trees. There are three parking lots where you can stop to spend some time at one of the most beautiful wild beaches in Florida. The road travels through seven miles of undeveloped beach. We visited two days after a major rain storm and had to drive slowly through water that came up to the bottom of our car doors. Be aware: This is a low-lying road that is easily flooded. The road again passes through spectacular views of sand and dunes. This time, you do have to pay the entrance fee to continue. (Photo: Bonnie Gross) The Fort Pickens area of Gulf Islands National SeashoreĪ few miles west of Pensacola Beach on Highway 399, you are back in Gulf Islands National Seashore in the Fort Pickens section. Inside Fort Pickens at Gulf Island National Seashore. This area was named Opal Beach after the eye of Hurricane Opal, a Category 4 storm, came ashore here, flattening the sand dunes. It boggles the mind to think how all Florida’s barrier islands might have once looked like this.Ī big chunk of Florida’s section of Gulf Islands National Seashore is located on Santa Rosa Island west of Navarre Beach. With the whitest sand I’ve ever seen, Opal Beach is a sight to behold. Santa Rosa is a narrow barrier island where sand dunes stretch from the Gulf shore to Santa Rosa Sound. The Opal Beach section of Gulf Islands National Seashore Map of Gulf Islands National Seashore in the Pensacola area. These places are both remarkable, and like most national parks I’ve visited, do not disappoint. Exploring Fort Pickens, a fort built largely by enslaved people in 1834 out of 21 million bricks.Experiencing a pristine barrier island with white sand like sugar.I’m covering just the Florida section, and my assessment is that there are two key highlights: The Opal Beach section of Gulf Islands National Seashore near Pensacola. Euphoria season 2 special episode8/18/2023 “Sometimes shit just is what it is.”) He’s her enabler, essentially. (“I feel like everyone’s looking for a cause and effect,” he says. In his bedroom, she opens up to him about her dad’s death, but he won’t entertain the idea that her grief is inextricably tied with her addiction. So in Rue’s ignorance, she keeps hanging out with Elliot, and their mellow dynamic stands in such contrast to the charged connection between her and Jules. The dramatic turnaround in how Rue and Jules feel about each other is abrupt, but their inability to address the train station goes in tandem with Rue’s secrecy, perhaps fueled by her resentment for what Jules did. Since Rue’s death scare at New Year’s, she’s been taking drugs with him regularly, and an uncomfortable introduction with Jules leaves her jealous and heartbroken. Now, the two are happy(ish) and officially dating. Not that long ago, the latter was confessing that she was in love with another girl. “You don’t know how much power you have,” he reassures her, but the imbalance will always be in his favor.Īs for Rue and Jules, I’m really unsure of where they stand right now. He lies and manipulates her with such ease. But the only thing that can take her mind off of Maddy is sneaking out to see Nate - she’s stuck in a neverending ouroboros of lust and loathing. He constantly dangles the threat of Maddy finding out, sending Cassie into such a guilt-ridden spiral that she forgets to clean Nate’s blood from her legs, like an untouched crime scene. His ex-girlfriend is a fierce opponent, while Cassie is a pliable target. “Cassie was the opposite.” But it is all still a game to Nate. “With Maddy, it was always a game,” she says. Only now, Cal knows that his son is aware of the missing disk.Ĭassie’s allure is explained in Rue’s perennial voiceover. When Cal asks why Fez beat him up, Nate fabricates a lie about him, Rue, Jules to keep his father in the dark about his own involvement. Despite the consequences of his actions literally smacking him in the face, he reverts back to his manipulative ways before his wounds have even healed. It’s not like this will mean anything anyway. Or something similar that looks profound on paper. It culminates in a baby wailing over his blissed-out smile, suggesting birth and (near) death going hand in hand. Jacob Elordi has so far been required to exhibit the emotional range of a race car, so in his place, past, present, sex, rage, and fear are entangled in a cacophonous montage. This is when Euphoria’s maximalist style actually comes in handy for telegraphing Nate’s overabundant stress. Nate is torn between his new, undeveloped relationship with Cassie - supposedly “in love,” he fantasizes about a white-picket-fence future with her - and Maddy, who just can’t escape from him. He’s quickly taken to the hospital, the sound of a stretcher wheeling across the floor accompanied by a pair of clicking heels on either side. The episode picks up right where we left off, on Nate’s bloody face after a brutal pummeling from Fez. Up until now, Euphoria has stayed faithful to its structure, beginning with a cold open that establishes why each major character is, to put it lightly, such a mess. “Out of Touch” marks the first departure from the formula, but to the dismay of probably everyone, including me, the focus is back on Nate. Ft86club bfgoodrich g force sport comp 28/18/2023 We have industry mainstays, such as Michelin, Bridgestone, Dunlop, and Pirelli, and more value-oriented brands, such as Federal, Goodyear, and Yokohama. There are many tire manufacturers that cater to the car community. So, after buying your new aftermarket wheels, you need to wrap them in grippier, more sport-oriented tires. And for those who drive stock cars, one of the first things you realize is that your standard tires weren’t designed to corner hard. No, the appropriate time and place would be at your local racetrack on a clear day – with your friends, and with like-minded enthusiasts.Ī good reason to take your car to the track is to test the limits of what your car can do. Of course one cannot drive like Cannonballer Brock Yates on crowded streets and highways: there is a place and time for fast driving, and that’s not on the I-50 just past midnight or on a city street packed with pedestrians. We don’t merely use our vehicles as a means of transportation we actually like driving our cars, and that means we also like driving our cars fast. It’s important to note that often your standard tires won’t fit if you buy new wheels, so surprise, surprise, you need new tires.Īs car enthusiasts, we have a connection with our vehicles that non-enthusiasts have a hard time understanding. If you’ve read some of our previous articles, then you’re probably part of a community of car enthusiasts and you’re probably also planning to buy a new set of wheels in the near future. Cards in a pinochle deck8/18/2023 The game can also be played using standard ranking with a simple change to scoring. The complete ordering from highest to lowest is A, 10, K, Q, J, 9. Pinochle follows a nonstandard card ordering. Deck Ī pinochle deck consists of two copies of each of the 9, 10, jack, queen, king, and ace cards of all four suits, for 48 cards per deck. It was also temporarily banned in some other US cities as a result of its German heritage, but has since regained popularity. Auction Pinochle for three players has some similarities with the German game Skat, although the bidding is more similar to that of Bid Whist.ĭuring World War I, the city of Syracuse, New York, outlawed the playing of pinochle in a gesture of anti-German sentiment. German immigrants brought the game of Binokel to America in the latter quarter of the 19th century, where it was mispronounced and misspelled "Pinochle." Pinochle was the favorite card game of American Jewish and Irish immigrants, while Skat was the preferred game of a majority of German immigrants. This latter pronunciation of the game was adopted by German speakers. The term may also be related to the French word binage for the combination of cards called "binocle". There are also suggestions that the word pinochle comes from bis (until) and Knöchel (knuckle) because originally the game ended when a player rapped their knuckles on the table. It may come from the French word binocle literally meaning "two eyes", or "eyeglasses" or "binoculars", and was a reference to the mythical notion that the German game of Binocle was invented with a special deck where the Queen of Spades and Jack of Diamonds were pictured in side profile with just one eye each. The word pinochle has several different potential derivations. A second alternative is that Pinochle actually developed from the Swiss and, later, South German game of Binocle or Binokel, which in turn is a descendant of Bezique. One is that it is a cousin of Binokel, with both games evolving from the game of Bezique. Pinochle is thought to have two possible origins. The standard game today is called "partnership auction pinochle". Each hand is played in three phases: bidding, melds, and tricks. It is thus considered part of a "trick-and-meld" category which also includes the game belote. It is derived from the card game bezique players score points by trick-taking and also by forming combinations of cards into melds. Pinochle ( English: / ˈ p iː n ʌ k əl/), also called pinocle or penuchle, is a trick-taking, Ace-Ten card game typically for two to four players and played with a 48-card deck. Check Slack.The queen of spades and the jack of diamonds are the "pinochle" meld of pinochle.Ĥ in partnerships or 3 individually variants exist for 2–6 or 8 playersĤ8 (double 24 card deck) or 80 (quadruple 20 card deck) Think about others’ spoken and unspoken struggles as we navigate evolving COVID complexities.ĭecember event at White Duck in the works. Aces – run up the first part of the hill, sprinting the straight part, mailbox to curve.Spades – Squats (modify up to squat jumps).Clubs – Underdogs (just bend your knees more). Willy Mays Hays (the wrong way) 10ct ea side.Yeah, so, here we go.ĭynamic warm-up as we moseyed to the swingsets Only 48 cards, but every card is in there twice, and the lowest card is a 9. A pinochle deck of cards can be good or bad, depending your perspective. A breezy 52 degrees when 6 PAX joined the fun. Diffraction of light lab8/18/2023 Why do we not see an infinite number of spots? What determines the maximum number of diffraction spots? Derive a mathematical expression for the maximum number of spots. Note that only 5 diffracted spots are visible with the 15,000 lpi grating. The grating material has aged over the past 10 years because of environmental effects. For the grating labeled 15,000 lines per inch, measure the diffraction angles of the spots, and use this information to compute the actual periodicity of the grating.Do the patterns from the gratings behave as predicted by the theory? Examine the Fraunhofer patterns from the three amplitude transmission diffraction gratings (labeled as 2,400, 7,500 and 15,000 lines/inch) and describe the patterns you see.What is the theoretically expected pattern as N → ∞. Sketch the pattern for various values of N and explain qualitatively what happens as N increases from 2.The number of slits, N, in each grating is indicated beneath each set of the gratings. These are contained on the bottom row of the plastic-mounted slide of 3.2. Set up and observe the Fraunhofer diffraction pattern due to the N-slit gratings. Provide a reconstruction of the slits, then compare their relative dimensions numerically. Using the captured image, employ Matlab to calculate the relative spacing of the slits. It is important that you not move the imager from its current location. Optional: Using the CCD imager, as shown in Figure 1, capture an image of the two-slit diffraction pattern.Explain why and how varying the slit separation affects the diffraction pattern.Rank the double slits in order of increasing separation. Using Vernier Labquest, and Vernier Light Sensor (LS-BTA) This experiment is a complement to the.
Download mcafee stinger8/18/2023 Q: I know I have a virus, but Stinger did not detect one. If you select "High" or "Very High," McAfee Labs recommends that you set the "On threat detection" action to "Report" only for the first scan. Stinger leverages GTI File Reputation and runs network heuristics at Medium level by default.By default, Stinger will repair any infected files it finds.Click the Scan button to begin scanning the specified drives/directories.Stinger has the capability to scan targets of Rootkits, which is not enabled by default.If necessary, click the "Customize my scan" link to add additional drives/directories to your scan. By default, Stinger scans for running processes, loaded modules, registry, WMI and directory locations known to be used by malware on a machine to keep scan times minimal.The Stinger interface will be displayed.When the download is complete, navigate to the folder that contains the downloaded Stinger file, and run it.When prompted, choose to save the file to a convenient location on your hard disk, such as your Desktop folder.Download the latest version of Stinger.McAfee Stinger now detects and removes GameOver Zeus and CryptoLocker. It detects and removes threats identified under the "Threat List" option under Advanced menu options in the Stinger application. Stinger utilizes next-generation scan technology, including rootkit scanning, and scan performance optimizations. It’s not a substitute for full antivirus protection, but a specialized tool to assist administrators and users when dealing with infected system. McAfee Stinger is a standalone utility used to detect and remove specific viruses. Sql server deadlock prevention8/18/2023 In future posts we will look at how to troubleshoot and avoid deadlocks. You can set in your code the priority using the statement SET DEADLOCK_PRIORITY and indicate a number between -10 and 10, or LOW, NORMAL and HIGH. SQL Server has a method to determine which process to choose as the deadlock victim. How to prevent deadlock in sql server Forums 4.0 Msdn en-US en 1033 Msdn. You can see Process A has completed, and Process B was chosen as the victim and was rolled back:įinally, we need to run COMMIT TRANSACTION on Process A to commit and remove the lock on Tables A and B. Transaction (Process ID 73) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Transaction (Process ID 53) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Now, if we run the 2nd statement from Process B, we get the message: Next if we run the 2nd update statement from Process A, it will wait until it can get an exclusive lock: If we run the first update statements with the transaction we see the tables are updated: If the process finds a deadlock, it will run every 100 milliseconds and then return to every 5 seconds once no more deadlocks occur. SQL Server will then decide who is the deadlock “victim” based on a process that runs every 5 seconds by default (via process LOCK_MONITOR). The two processes are now waiting for each other, and they are therefore deadlocked. So, it will also wait for the lock to be removed. However, Process A has a lock on Table A. Now, Process B will try to update Table A. So, it will wait for the lock to be removed. However, Process B has a lock on Table B. Next, Process A will try to update Table B. Process B will put a lock on Table B as it updates it. What can happen, is Process A will put a lock on Table A as it updates it. In a simple situation, the most general advice applies, and that is to touch the tables in the same order each time when constructing queries. Now, let’s say these two processes are run at the same time. Since SQL Server looks for deadlocks every 5 seconds and kills the query that’s the easiest to roll back, we were able to see the deadlock victim emerge. Process B will update Table B, then Table A. Process A will update Table A, then Table B. These could be stored procedures, for example, as a transaction calling a SQL update like below: - Process A Now let’s assume you have 2 processes, Process A and Process B. The tables are populated with one row of data like below: When a deadlock occurs in SQL Server A deadlock occurs in a database when two or more processes have already a resource locked, and then each process wants to acquire a lock on the resource that the other process has already locked. Each table contains 2 fields, an Id and a Description: Let’s say you have 2 tables, Table A and Table B. SQL Server has a process that detects if there is a deadlock occurring, and if so it will end one of the tasks, choosing it as the “victim”. For example, if you have a stored procedure that locks a table, and another stored procedure is also trying to access that table, you may end up with a permanent deadlock situation. In this post we will take a look at how deadlocks occur in SQL Server.ĭeadlocks are when two or more tasks are trying to lock the same resource. Ready or not pvp8/18/2023 Then they sail away somewhat, so he has us chase them down and we blow up their ship after they try to fire at us. We see this random galleon, and he wants to cannon himself at it to hide on it, just to mess with them for a bit. I was duoing a brigantine with my friend yesterday, who has an obsession with putting gunpowder kegs on other ships. See the linked topics in my post a ship is coming to sink you they don't know what's going on. That's what your assume it is already, but my and many others experience is very well balanced about friendly and hostile players. The thing about PvE servers is that there is then not that much uncertainty about players in Adventure mode. To me it's boring like hell, but i dont rate about that. Play on Alliance Servers, find people who lock down entire servers to ally and farm PvE the whole time. I also dont ask for PvP in a pure coop pve game.īut i also like some PvP and the uncertainty about other players sails on the horizon what is a core element of SoT. If you dislike PvP for whatever reason, no need to justify, this game is just not for you, because it's a PvPvE sandbox game. Horizontal progression makes it anyway not affecting you or anyone else if you loose. If someone is trashtalking and even insulting report for sure. It happens and at best you both aproach it playfull, fun orientated and dont take it too serious if you loose, because it's a game. The overall experience is not hostile and trolls all the time trying to sink you. Possible overreaction and exageration because of sour looser? How many ships you have spottet on the horizon that were not heading for you to kill on sight? Due to the fact there is no passive mode or way to avoid players whos only joy in life is to ruin someone else's good time.ĭuring your 4 hours of gathering loot, did you see other ships that have left you alone, were passive and peacefull? It is headed your way to destroy the last 4 hours of progress you have attempted to make. (They sonk in seconds, prob explains why we just needed a few min to get to them).Ĭould be that it's quieter in Europe or maybe because we are on a galleon but we often we only have PvE experiences during the evenings we said in Need a system to opt out of the problem is there is absolutely NO question what the ship on the horizon is up to. I hope you'll have better luck in the future, happy sailing!Īmen, hence why i have 3 PvPvE-ers in my crew while i'm myself a PvE-er (aka captain).Īlthough i must say we have less and less PvP on the seas unless we initialise it first, last wednesday for example we had 1 pvp encounter with an other Galleon (them sailing with the Jolly Roger) (in 6 hours of sailing), but only after we chased them for a few min. At the moment in this game's current state you can't have one without the other. My crew prefers the PvE content above all else, but in order to survive we've had to learn how to PvP. Other people's fun can unfortunately result in your fun getting spoiled. I understand your frustration, I've been there, and it's a learning process. Some crews don't know if the target ship has loot aboard until they confirm for themselves. Some crews enjoy PvP regardless if the target is carrying loot or not. Here's what the design director of the game thinks about PVE said in Need a system to opt out of PVP: I'm sorry you don't like the PVP aspect of this PVEVP game but the premise of the game is plastered everywhere in the shop, reviews, trailers: you will face other crews, you will face AI threats. When we don't encounter any other ships, we have loads of fun, but as soon as one of these people just sink us for the 'luls' it loses the fun factor and becomes much less enjoyable. Stuff like this is what makes these game no fun to play.Īt that point switch server if the same crew bothers you that much. The first time I can understand, but the second time within 5 minutes we were attacked again, REALLY? There needs to be an option to opt out of PVP. We had NOTHING on the ship and freshly spawned at that. My friend and I respawn and get our new ship only to be bombarded by the same asshats that got us the first time. How about robbing people in a game named Sea of Thieves? Doesn't sound too far-fetched of a reason to me. Me and a buddy were just going about our business and for no reason what so ever another ship came and sank us. Let me guess, you are the judge on whether it's needed or not? There needs to be a system implemented to stop the constant PVP when its not needed. Welcome to the forums! Honored to reply to your very first post. Message queue example8/18/2023 This system call creates or allocates a System V message queue. Now, let us check the syntax and certain information on the above calls. Step 4 − Perform control operations on the message queue (msgctl()) Step 3 − Read from the message queue (msgrcv()) Step 2 − Write into message queue (msgsnd()) Step 1 − Create a message queue or connect to an already existing message queue (msgget()) To perform communication using message queues, following are the steps − Having seen certain information on message queues, now it is time to check for the system call (System V) which supports the message queues. Writing into the shared memory by one process with different data packets and reading from it by multiple processes, i.e., as per message type. As we are aware, reading can be done with multiple processes as well. Writing into the shared memory by one process and reading from the shared memory by another process. Using Shared Memory or Message Queues depends on the need of the application and how effectively it can be utilized.Ĭommunication using message queues can happen in the following ways − The first message inserted in the queue is the first one to be retrieved. Ofcourse, the order of message queue is FIFO (First In First Out). To simplify the given message type as 1, 10, 20, it can be either 0 or +ve or –ve as discussed below. In this case, it is simplier to implement with message queues. If we want to communicate with different data packets, say process A is sending message type 1 to process B, message type 10 to process C, and message type 20 to process D. What if all the processes do not need to access the shared memory but very few processes only need it, it would be better to implement with message queues. Not worth with regard to utilization in this kind of cases. Shared memory data need to be protected with synchronization when multiple processes communicating at the same time.įrequency of writing and reading using the shared memory is high, then it would be very complex to implement the functionality. If we want to communicate with small message formats. Whereas in shared memory, the data is available for multiple processes to access. See Configure message queues for information about setting up the message queue system.Why do we need message queues when we already have the shared memory? It would be for multiple reasons, let us try to break this into multiple points for simplification −Īs understood, once the message is received by a process it would be no longer available for any other process. RabbitMQ should be used whenever possible. Cron jobs ensure the consumers are able to receive messages. Three database tables ( queue, queue_message, and queue_message_status) manage the message queue workload. In this system, a MySQL adapter stores messages in the database. RabbitMQ is based on the Advanced Message Queuing Protocol (AMQP) 0.9.1 specification.Ī basic message queue system can also be set up without using RabbitMQ. It also includes a mechanism for storing undelivered messages. The MQF primarily uses RabbitMQ as the messaging broker, which provides a scalable platform for sending and receiving messages. It also creates consumers to receive them asynchronously. In Adobe Commerce and Magento Open Source, the Message Queue Framework (MQF) is a fully-functional system that allows a module to publish messages to queues. When a sender places a message onto a queue, it is stored until the recipient receives them. Message queues provide an asynchronous communications mechanism in which the sender and the receiver of a message do not contact each other, nor do they need to communicate with the message queue at the same time. AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |