Here’s an alphabetical list of all available free books. Note that many of the links will bring you to an external page, usually with more info about the book and the download links. Also, the links are updated as frequently as possible, however some of them might be broken. Broken links are constantly being fixed. In case you want to report a broken link, or a link that violates copyrights, use the contact form.
A Beginner’s Guide to Mathematica
A Brief Introduction to Particle Physics
A First Course in General Relativity
A New Astronomy
A No-Nonsense Introduction to General Relativity
A Popular History of Astronomy During the Nineteenth Century, Fourth Edition
A Review of General Chemistry
A Simple Guide to Backyard Astronomy
A Text Book for High School Students Studying Physics
A Tour of Triangle Geometry
About Life: Concepts in Modern Biology
Advanced Mathematics for Engineers
Advanced Microwave Circuits and Systems
Advances in Computer Science and IT
Advances in Evolutionary Algorithms
Advances in Geoscience and Remote Sensing
Advances in Haptics
Advances in Human Computer Interaction
Age of Einstein
Aging by Design
AMPL: A Modeling Language for Mathematical Programming
An Introduction to Elementary Particles
An Introduction to Higher Mathematics
An Introduction to Many Worlds in Quantum Computation
An Introduction to Mathematical Reasoning
An Introduction to Mathematics
An Introduction to Proofs and the Mathematical Vernacular
An Introduction to Relativistic Quantum Mechanics
Analysis 1 (Tao T)
Analysis 2 (Tao T)
Astronomy for Amateurs
Astronomy with an Opera-Glass
Automation and Robotics
Basic Algebra, Topology and Differential Calculus
Basic Concepts of Mathematics
Basic Concepts of Thermodynamics
Basic Concepts of Thermodynamics Chapter 1
Basic Ideas in Chemistry
Basic Math: Quick Reference eBook
Basic Mathematics for Astronomy
Basic Positional Astronomy
Basic Principles of Classical and Statistical Thermodynamics
The Pleiades, Feb 2017 Version by CajunAstro Via Flickr: I shot this from a relatively dark sky location and used 31 x 5 minute ISO 1600 exposures or 2.58 hours of total integration. Minimal post-processing and noise reduction. Nearly perfect conditions of seeing and transparency.
I’ve been getting quite a few messages asking for advice in the Voice Acting field, so I’ve written a bit of a guide! I hope it’s helpful.
off, I would have never considered myself to be an expert on something like
this, but then I realised I’ve been doing it for about twenty years now, so I
guess I have SOME advice I can pass along.
YOUR ENEMY (AND SIBILANCE IS NOT YOUR FRIEND)!
pulls a listener out of the world you’re trying to create like those pesky pops
in your recordings (Tuhs, Kuhs, and Puhs), or those sharp “Ssssss” noises that slice through the mic.
Luckily, they’re fairly easy to prevent. BUT
HOW?!? I’M TELLING YOU HOW! SIT DOWN! The best advice? Get yourself a pop
filter. They’re relatively cheap and very effective (however, if you are BROKE
AF like I was when I started recording, get an embroidery hoop and some
dollar-store panty hose and you are SET. No joke – that was my first pop
filter. I held it between me and the mic and it WORKED). Now sometimes a filter isn’t enough – if you’re really yelling it out,
a filter will not save you. In these cases, you wanna make sure you know where
your plosives are, and tilt your head accordingly. You only have to move a few
degrees to avoid it – just put your hand in front of your mouth when you
rehearse and you can feel where your air is coming from. Just don’t do the
whole performance pointed away from the mic – it will hollow your sound out.
COUNTRYMEN! LEND ME YOUR GEAR!
do NOT need top of the line gear to sound good; your performance is what makes
or breaks you. That said, you can’t use a headset microphone and expect studio
quality. For the best quality (without breaking the bank), I recommend
microphones from the Blue line – Snowballs and Yetis specifically. They’re both
designed for podcasting, plug DIRECTLY into your computer, and sound
incredible! I still use my Yeti every once in a while – it’s a great piece of
These microphones, although amazing, rest on your table. That means you will
have to pay attention to a few things – not touching the table while recording,
not moving around in your chair while recording, and (most importantly)
watching your computer placement! If you’re using a laptop, it will undoubtedly
be sitting beside your mic and your mic will HATE IT. You may not hear the fan
on your computer, but your microphone will. Vibrations will ruin your
recordings, BUT there’s a solution! Well, two actually: You can fold a towel
up, place it on the table, stack a few books on top of the towel and sit your
mic on top of that, OR you can move your computer to another surface. It really
depends on your space set up. Just make sure you have a USB long enough to
reach the mic to the computer and you’re set.
Now, there’s the issue of reverb in your chosen room of recording. Almost every room will have an echo in it, and you will pick it up. You can prevent this a few different ways - you can spend hundreds on soundproof foam (took me a while to save up for that, totes worth it), you can record inside a closet (brilliant idea, enclosed, clothes absorb echo), or you can drape a blanket over you and your mic (gets warm fast, but it works!). Whichever way you choose, you will notice a boost in quality - the less ambient noise you have going on behind you, the better. All ambient noise in my recordings is put in AFTER I’ve finished editing my clips. It’s the same for any production - if you rely on your actual background noise for ambience, you will not be able to edit yourself properly as the cuts become too noticeable, ESPECIALLY if you’re recording a dialogue.
A quick note
about SOFTWARE: I always use Adobe Audition – I enjoy the look and feel of it,
and have never really used anything different. However, it’s not free! If you
want a great, FREE program for audio recording, I wholly recommend Audacity! It’s
a brilliant, powerful, and free program that will give you great results!
TIME FOR THE
has always been one thing I love about Voice Acting over Acting – No one has to
LOOK AT ME. I’m not insulting myself here, I’m just saying sometimes you have
to make some STUPID faces to get a voice you want. Voice Acting is incredibly
freeing in this regard – you can be ANYONE or ANYTHING, and that is very
can’t make this point enough times – in most cases, you’re doing this solo, so DON’T
BE MODEST. It will hold up your performance – if you hold back in any way when
voicing, you’re only hurting yourself. Sure you may feel silly doing certain
things, but no one listening will think that. Some voices give me fifty chins,
some cross my eyes, but if I didn’t do it, every character would sound the
let’s talk about PACING! My Friend and Mentor (may she fight well in Valhalla)
gave me the best advice in this regard; she said, “If it feels like you’re
going too slow, go slower.” Too often we feel we’re keeping a proper pace when
recording, but the truth is we are rushing it. In an actual conversation, you
haven’t rehearsed – you rarely know EXACTLY what you’re going to say to someone
else, so your dialogue should be no different. Your character needs time to
think, to react. If you ever want a moment of high tension, you CANNOT rush it.
You need the pauses and the breaths, or else it just becomes unrealistic.
CLEAN THAT FILTHY, FILTHY AUDIO!
clean audio has become a relatively new addition to my work – I used to simply
use the Noise Reduction effect on my recording and call it a day, but it doesn’t
get rid of the new bane of my existence: MOUTH NOISE.
do it. Everyone does it. I did it five minutes ago and I’m gonna do it again.
We smack our lips, we flick our tongue, we click our teeth, we make stupid
noises when we’re not talking, and the MIC WILL HEAR IT. My best advice is,
after reducing the noise in your audio (all programs have a basic preset to
kill the dead air noises in your recordings – google it to find how to your
respective noise reduction), highlight the sections between your audio and
reduce the volume to ZERO. Just kill the noise between your speech (the whole
sentence, not silencing between every word, that would be crazy) – you can
leave the sound of your inhales in if you want, but even they can be taken away
for a cleaner sound. Just make sure you don’t chop your words off – especially the
ends of your words.
sure you clean your audio BEFORE you add ANY form of reverb or echo! Otherwise
cleaning is impossible.
FROM A MADMAN!
Acting isn’t easy. Nothing infuriates me more than actors talking about how
they like Voice Acting because it’s “EASY”. If it’s easy, you’re not trying
hard enough. You have to convey thoughts, feelings, and ideas ALL WITH JUST
YOUR VOICE. Anyone who says it’s easy is a fool.
try your best to create something you feel proud of. You take as many takes as
you need, but never compromise your quality for the sake of just getting it
you can’t get a voice down right today? Do it tomorrow.
Above all else: HAVE FUN WITH IT
hope this has been helpful to you – if you have any questions about specific
things/things I may have missed, shoot me a message!
This one I made last spring and is my very first outdoor scenario ever, thus, I didn’t succeed with is as well as I wished. One thing for sure: I procrastinated making this pic for weeks. I was damn afraid to do something I’d never done with sims 4 before and the fact that I’ve got extreme expectations for myself did not help.
First things first, I don’t/didn’t have Reshade. (never used it to be honest).
1. I began by exploring what I can do with the sims 4 world. I attempted to find a lot that might have a large meadow with a horizon far away.
Well, I could not find any such lot.
I’m so used to open world from sims 3 (where you can openly mod outdoors to your liking) so the sims 4 world restrictions are not easy to get used to. (At least the outdoor lighting is much better in ts4) So, I settled on a lot that could give me the illusion of a meadow from a right angle. This is what I had in the very beginning:
2. I build a meadow which was just spamming flowers on the field with moveobjects on. I went with these cute cc daisies, and to match the realism of the flowers I also modded the sky. Then I tested poses and various camera angles.
3. I soon realized I did not like the realistic flowers and sky, it just didn’t feel right to me. I adore the cartoon style of sims 4 so I needed to get it back asap. So I switched the cc flower to maxis match flowers and tried different colors with the whole scene.
4. Once I chose my favorite screen shot, I then began to edit it. My editing methods aren’t fluent, I just try different things to see what I like and I use a lot of adjustment and mask layers.
First I used unsharp mask at 60% just to bring out some detail
Then I used Topaz noise reduction on 0.04 to get a bit of softness because I don’t like sharpness with sims 4, I want to stay close to the clay style
Then I tried out topaz clean basic blemish removal preset just for the surroundings because it made the grass, flowers and sky look nicer. I used mask layer to softy brush the effect off of the sim (that’s what that weird black-gray blur indicates in the picture below, haha)
after all that I needed to brighten up the big white flowers and the model to balance them with everything else. So I used Curve adjustment layer. Most importantly I used it with mask layer to paint the flower and the model visible only. Nothing else was affected by the curve adjustment.
Then I used dodge and burn tool to shade the sim model. I darkened the shadows on her and added a bit of highlight for depth.
Next I applied slight amount of Gaussian blur on whole image but used the mask layer so the blur was applied onto the front flowers only
Then Brightness and Contrast: brightness 8 / contrast 17
Then Selective color: RED +9 +17, GREEN +16 -25and BLUES +12 +11
Gradient map of #f4dbf6 and #d05ed7 with Soft Light mode 40% opacity
Color Balance: Midtones Yellow/Blue -18
Lastly I created a simple radial gradient layer with overlay mode and used free shine brushes to stamp sun rays on the pic with soft light mode and finally added dust speckles with a free brush as well. For what reason? I dunno.
Well, that’s all the randomness it took me to get the image done. It’s a big mess of adjustment layers for sure (〃∀〃)ゞ I Didn’t know what I wanted, just kept testing. So in no way is this a tutorial but just how I made this pic with some description.
Lighting was my main challenge. I had decent backlight, but I think I needed to add more light from above or maybe increasing the distance between the colored paper and the oil/water mixture, to allow more light in from the bottom. My shots came out a little too dark, even with a slower shutter speed.
In editing, since the shots were darker, I had to bring up exposure, which caused a lot of noise. Sharpening and noise reduction just brought out funky edges.
All in all, it was a blast trying and so easy to do from the comfort of my home! I’ll be trying it again with my improvements and hopefully come out with crisp, clean bubbles! :D
i’ve finally got a chance to do a tutorial on sharpening gifs! here today i am demonstrating how i sharpen gifs like this
to follow this tutorial, you will have to have general knowledge of how to make a gif on photoshop. if you don’t already, you can read an old tutorial that i made; since i don’t exactly gif like that now, you can ask for a new tutorial if you wonder what my current gif-making steps are.
also, i do it on photoshop with the timeline option so that i can sharpen all the frames at once. make sure you have this function on your photoshop (see step 2).
How do you make your screenshots look so perfect!!!!
!!! THIS IS THE SWEETEST, LEGIT! Thank you!!! 💚💚💚 As far as how I do them… I answered one of these asks privately unfortunately and I wish I had saved it to do it publicly so I’m going to write up a very short and hopefully understandable tutorial on how I edit that’s more eloquent than before (with any luck.)
First things first!
I adjust my in-game lighting before I do anything!! I set the color intensity of ALL indoor lights to “Warm White” and I dial back the intensity one notch so that it’s not all the way up! of course, if you’re working in a place like a nightclub where the lights are dark or need to be colored, go crazy and get colorful. mood lighting, yo.
Second thing: I use Photoshop CS3 to edit my pictures with! just so you know what program I’ll be talking about through this.
On to the editing!
So after I’ve opened my screenshot that I want to edit, I resize my imagine down to 800x419. I know you’re supposed to wait until the very end to resize or crop your pictures!! but at this point its a force of habit to do it first thing and i can’t stop myself. I don’t crop, I just resize!
But I’m still not 100% satisfied with where it looks, so next I go to Layer > New Adjustment Layer > Hue/Saturation. A little menu pops up about creating a new layer for this mask, and I say okay! What comes up next is a small menu for adjusting the hue/saturation of the layer, and I work by integers because for me they’re solid and concrete and uniform every time! So if I’m working with an indoor screenshot, I boost the Saturation by a number of “10″ and if it’s an outdoor screenshot, I boost it by a number of “12.” Feel free to adjust this number as you might need!
Sometimes, especially with indoor pictures, I have a problem with the screenshot looking TOO warm and yellow. If I have that issue, what I do is make a new layer and fill it with this color:
#ac9af1, or some approximation!
When I have the whole layer filled and it takes up all of my canvas, I change it to an Overlay and drop the opacity to around 10%! That will take the yellow edge off by cooling down the screenshot.
One last step!
The absolute last thing that I do, anon, is make sure my image is flattened and is all one layer together! With it brightened and the colors popping, I can finally go to Filter > Noise > Reduce Noise. I do this for EVERY SINGLE ONE OF MY PICTURES!!! And I think it’s what makes my screenshots look the way they do.
Noise (and noise reduction) can be kind of tricky to play with, so here are my settings!
Sometimes I fall out of love with the way my screenshots look and I play with these settings. Over the course of my editing, I’ve gone down from a strength of 5 to a strength of 3! So feel free to tweak any of these so that your screenshots look perfect to YOU!
I save my edited screenshot into a new folder that’s easy to get to, depending on the project I’m editing for! My Zambrano ISBI has its own folder, with subfolders within it for easy sorting! After its all said and done, I delete the originals from my screenshots folder so that it’s clean and ready to go for my next round of gameplay! And that’s it!! I hope this helped you, anon, and if anyone has any suggestions, feel free to let me know!
NASA and Boeing teamed up to produce the X-48C, a subscale prototype that first flew in August 2012. Creating small flying models to test new ideas is faster, safer and less expensive than building full sized research aircraft. The new idea here is the Blended Wing Body. This idea improves efficiency and capacity for future airline designs.
One of the design goals here was to lower the noise of an airliner. Over the decades, jet engines have made huge advances in noise reduction, but less has been done about the sound generated by the aerodynamics of the ship cutting through the air. Deploying landing gear and flaps creates drag, thus creating noise. These devices are used at low level (during takeoff and landing), when the noise level of the aircraft is most critical. This design strives to make those non propulsive parts quieter by “sculpting” them into the body in a more efficient way.
The windows on the model are not just for show. A small camera sits behind the windows, feeding a ground based pilot a view from the tiny cockpit, allowing them better situational awareness during the flights.
This X-48C is on display at the Air Force Flight Test Museum on Edwards Air Force Base, California, serving as a precursor of things to come. Like so many aircraft that have graced the flightline of Edwards, this may serve as the aircraft of the future.
I saw a Facebook ad for a wind noise reduction device that attaches to bike helmet straps. This would be perfect for me, as my hearing isn’t very good to begin with and wind noise makes it impossible talk with anyone.
The retail product is only $16 but I was bored today and decided to try to make it myself. It occurred to me that open-cell foam like what covers a microphone would work best. And the easiest/cheapest place to find that is a cheap foam paintbrush (2 for $1.49). After cutting the foam free of the brush stick, just attach to the helmet strap with Velcro secured by a little thread.
It works great - MUCH quieter but unlike wearing earplugs I can still hear my surroundings.
On this day in music history: March 9, 1975 - “Katy Lied”, the fourth studio album by Steely Dan is released. Produced by Gary Katz, it is recorded at ABC Recording Studios in Los Angeles, CA from November 1974 - January 1975. The album’s title is a play on the word “katydid”, the species of grasshopper that appears on the LP’s cover (taken by Fagen’s then girlfriend Dorothy White). Several of the songs are piano based, with the duo utilizing keyboardist Michael Omartian to play on many of the tracks. For the sessions, Becker and Fagen use a seven foot long Bosendorfer grand piano (at the time costing over $13,000), which they talk their label ABC Records into paying for. The album features numerous top flight musicians including Crusaders member Wilton Felder (bass), Chuck Rainey (bass), Victor Feldman (percussion), Rick Derringer, Hugh McCracken, Larry Carlton, Dean Parks, Elliott Randall (guitar), Hal Blaine (drums), Michael McDonald (background vocals) and future Toto members David Paich (keyboards) and Jeff Porcaro (drums). Only twenty one years old at the time, Porcaro plays drums on nine of the albums’ ten tracks. Becker and Fagen experience major technical difficulties when the dbx noise reduction system malfunctions, rather than using the industry standard Dolby A noise reduction while mixing the album. In spite of efforts to correct the problem, they are unable to fix it entirely. Nearly deciding to scrap the album altogether, Becker and Fagen release it as is but have refused to listen to it since. It spins off two singles including “Black Friday” (#37 Pop) and “Bad Sneakers” (#103 Pop). In 1978, the audiophile label Mobile Fidelity Sound Lab issues a half speed mastered pressing of the album. It sells poorly upon its release, and is deleted not long after. Though it ends up becoming a sought after collector’s item after it goes out of print, commanding as much as $300 - 400 for a sealed copy. The album is remastered and reissued on CD in 1999. “Katy Lied” peaks at number thirteen on the Billboard Top 200, and is certified Platinum in the US by the RIAA.
Heyo! How do you get such high quality photos from your DS? Your blog is sooo cute!
tysm for liking my blog~!!
♡ ㅠㅠ as for my photos, i use the L+R function to take them. afterwards i transfer the photos from my sd card onto my computer, and then i use waifu2x to make them look hq! for noise reduction i usually set it to medium/high and i upscale to 2x. hope this helped~! (
„ ❛ ֊ ❛„)
Hi! I'm pretty new to tumblr and I want to start making gifs but they always look grainy and I was just wondering how you got yours to look nice?
hi!!! hmm these are some tips i could think of so hopefully they’ll solve your problem there:
use hd videos like 1080p or 720p. sometimes there’re options like 2k welp i mean while they’re super clear but they’re too extra & not necessary
edit on a screenshot stack instead of an unedited gif. unedited gifs are always already grainy
sharpen your gifs. however oversharpening could cause grains, but it can be solved by trial and error.
use noise reduction as well. it smoothes out your gifs!
these are what my gifs look like with/without sharpening and noise reduction:
also for imac users: the other day i saw this post stating photoshop cs5 is better than cs6 in gif making, i didn’t know this bc i haven’t use cs5 before and don’t use cs6 anymore (i’m not an imac user either), but you can still take a look at it!
I saw some asked Kyilili this question, but what do you think the top 10 gifts are that Aro would want to get a hold of?
First I have to link Kyilliki’s answer because it’s so fun. And here’s some more, in no particular order:
1. Supernatural storyteller: I mentioned the need for vampire skalds the other day, but Aro wants a *magic* storyteller, one that’s a bit Renesmee-ish. This person can tweak the senses to experience the story being told. You taste the salt air when you hear about a sea voyage, see the beautiful pollution-inspired sunsets when you haven’t looked out of a window for 800 years, smell the burning flesh of the protagonists in the Lay of the Last Libishomen (um, that’s Caius’ favorite, I guess?), and best of all: this storytelling vampire can make you taste and enjoy the food she remembers sampling back in her human traveling days. You might think Aro doesn’t need this gift because of his own, but his “experiences” via others’ minds are more observant and flat than what he hopes to achieve here. Of course the storyteller can’t be too powerful; pure hypnosis presents an assassination risk.
2. Eyes and Ears: I have to agree with Kyilliki on this one. Aro wants the ability to peek in on anyone, anytime, anywhere. Realistically, if he ever got a hold of Alice this is what he would use her for 99% of the time. He knows enough about the subjective caveats of her gift to be skeptical of its usefulness in true large-scale future-predicting, and sadly he’s fresh out of wars to fight at the moment anyway. But all he would have to do is have Caius and Demetri take her on a world tour and meet everyone he knows, and then she’d theoretically be able to “latch” onto any of them, in that “immediate future” way she has of spying on looking out for people she’s familiar with.
3. Pain Management Specialist: If Aro ever finds this person, they’ll be gift wrapped and given to Caius as a birthday present. Aro isn’t really all that interested in torture himself (besides the evil-scientist kind), but he does feel rather sad for Caius that the Volturi actually only have Jane’s gift to use for this. (Alec’s is creepier, but it doesn’t make people scream enough) Anyway, this person can actually access his target’s pain history, and not just physical pain either. The most horrible memories are brought up to relive, worst fears feel imminent, etc. I’m totally borrowing this from Haemophilus Leona’s Saudade, chapter 16, in which Jane’s gift operates this way. But in giving this gift to another vampire, Aro gets to double Caius’ interrogation arsenal, plus Jane gets taken down a notch, which is long overdue.
4. X-ray vision: Let’s be honest: dissecting vampires is hard, and dissecting werewolves smells really terrible. Aro needs a living, breathing MRI machine for his research. The coolest thing about this person is that they don’t just give him a fuzzy gray image or colored dots- it’s like that old Adam software where you can peel away the layers “in vivo”.
5. Miracle Healer: Automatic tissue regeneration is cool, but Aro wants a vampire who can touch a vampire’s severed arm and regrow the missing hand itself. He misses the Didyme Days when pilgrims flocked to Volterra (or wherever they lived back then) just to bask in her aura; having a humanitarian (vampiritarian?) talent or two like this on hand would make Volterra a positive destination again, not just a negative one. Caius argues that he doesn’t want more useless visitors, but he can’t deny it would be handy to be able to replace his Guards’ limbs when he gets a little too carried away with his Fireside Chats.
6. I have no idea what to call this, but Aro wants a vampire who can examine any work of art and then go home and duplicate it perfectly. But even that’s not good enough; he wants to breed find a person who can extract a piece of art from someone’s memory and duplicate it from that. Aro can steal all he wants, but he can’t go back and un-burn the stuff he didn’t have time to save from the Library of Alexandria. (”Perhaps you shouldn’t have started that stupid fire in the first place,” Athenodora says every time this comes up. “Nobody’s perfect,” Aro always replies.)
7. Gift-Finder: Nope, I don’t mean another Eleazar. I mean someone who can discreetly look your wife in the eye and know what she wants for an anniversary gift. This vampire is Super Needed after Aro’s faux pas last year of giving his beloved Sulpicia a lifetime suscription to Girls and Corpses.
8. Gift-Dampener: You guys know I don’t like super-powered OCs. The only powerful OC I want is one whose proximity temporarily shuts off all gifts within a certain radius. Emphasis on temporarily, because otherwise that would be a superpower, now wouldn’t it? Anyway, this one is only on Aro’s list because it turns out this is exactly what Sulpicia wants for her anniversary gift: a month-long second honeymoon during which Aro has no clue what she’s thinking.
9. Changeling: Um, better employ that #7 gift again, Aro. Turns out what Marcus wanted for Christmas was not a vampire who can alter their cellular structure to look and smell like Didyme.
10. Supernatural Materials Engineer: Because of the risk of this genius vampire developing those cool vampire-tissue weapons that are always popping up in fanfics, they’ll only be alive long enough to invent the best possible noise-reduction technology ever. Volterra’s inner walls might be “sound-proof” to human ears, but they’re not good enough yet.
Thank you anon, this was really fun :) Anyone else got some ideas?
1. I use waifu2x to kinda smooth it with high noise reduction and 1.6 scale 2. After, I fix some imperfections in an image program like wiggly lines or details that don’t look good (depending on how much patience i have) 3. Then I adjust colors by color overlay and increasing/decreasing contrast, brightness and or saturation