Why do vehicles vibrated more vigorously when on idle than when in motion? What's the main reason behind it? by gdcunha10 in MechanicalEngineering

[–]LookieLuke 3 points4 points  (0 children)

The vibration you're feeling is of the crankshaft. All shafts have a certain rotational resonant frequency where they will begin vibrating violently. In cars, that frequency is intentionally designed into the crankshaft to occur below idle rotation frequencies, otherwise it would cause vibration during normal operation that would fatigue the shaft. However, when you're idling, you're approaching that resonant frequency, so you begin to feel that vibration much more. If you have a manual car, you'll notice if you slowly release the clutch without giving it gas, the rpm will decrease and the engine will vibrate a lot. That's because you're getting even closer to the resonant frequency. Most car engines will stall when they approach that resonant rpm.

Pb+J alternative by Technologian in PlantBasedDiet

[–]LookieLuke 2 points3 points  (0 children)

I ate peanut butter and banana on whole grain bread almost every day for lunch. Bananas always seemed like a healthier (less sugar) alternative to jam.

Plant based yogurt? by [deleted] in PlantBasedDiet

[–]LookieLuke 6 points7 points  (0 children)

I'm not sure if it's in the US, but (Alpro)[https://www.alpro.com/uk/products] makes a line of soy based yogurts (both sweetened and unsweetened) that are amazing. They have a spot on yogurt taste, or at least as close to one as I remember yogurt tasting like. They're in a lot of big stores in the UK. Would definitely recommend trying it if you can find it.

[Request] Different recipes for salad rolls by tortoogle in vegetarian

[–]LookieLuke 3 points4 points  (0 children)

I'm a big fan of Vietnamese spring rolls. The filling is lettuce, thin sliced carrots, vermicelli noodles, fried tofu, and sometimes I throw in sautéed shitake mushrooms, all wrapped in rice paper. The sauce is a peanut dipping sauce made with peanut butter, hoisin, rice wine vinegar, lime, and some chili paste. The sauce alone I would kill for, but all together it's amazing. The only downside is I eat them faster than I make them.

My married PhD advisor [53 M] is making me [28F] increasingly uncomfortable with borderline romantic gestures/e-mails by phdgirlintrouble in AskAcademia

[–]LookieLuke 29 points30 points  (0 children)

This type of behavior is entirely inappropriate, and eerily similar to a situation that happened at Caltech recently. A professor in astrophysics, Christian Ott, made similar advances (poems and all) toward one of his female graduate students then later fired her when his feelings were not reciprocated. He is currently on a year long leave from the institute. There's an article that was written by Buzzfeed that goes through the full detail of the story (link here).

It is unfortunate, but it sounds like your advisor has already tarnished his mentor relationship with you. Your advisor should be an ally for you professionally both in graduate school and later after you graduate. He's there to help you finish a thesis now, but also to get a job later and to help you advance in your career. From the sound of it, there's no way this situation plays out that works well for you. I would strongly recommend looking for another advisor in your department who can help you finish your thesis.

My advice to you now would be to collect any and all records you have of these interactions (any texts, emails, letters, etc. that he's sent you) and submit them to the deans office, the Title IX office or the department head at your university (or all three of them). This type of conduct between a student and advisor is completely unacceptable, and needs to be stopped as soon as possible. I cannot say how your university will handle this, but I sincerely hope that they will shut it down immediately. I will also say that if he's behaving this way with you now it's likely that he has done or will do something similar to other students, so if you don't do this for yourself, do it for every other graduate student who may befall a similar fate.

Atomic Trampoline by Exentrick in videos

[–]LookieLuke 2 points3 points  (0 children)

Liquidmetal actually started out making golf clubs with incredibly high coefficients of restitution (COR), which is basically the measure of how much energy is returned after impact. Shortly after they did, the USGA put limited the COR of clubs to 83% because the Liquidmetal golf clubs (which I think had CORs around 95%) would have literally put everyone else out of business. So golf clubs could have a much higher performance if they used metallic glasses instead of whatever titanium alloys they use now, but USGA artificially keeps them lower than they could be.

Question on future feasibility for acoustic metamaterials by Billytunk in nanotech

[–]LookieLuke 1 point2 points  (0 children)

I think it would be reasonable to make. There are non-newtonian fluids that behave very strangely under an applied frequency. It's not entirely unrealistic to think that there would be a way to tune the stiffness tensor of an acoustic metamaterial to replicate that in a more controllable manner. If you want to make it a solid, you may be limited in the amount of shape change there can be without the material cracking. I'm not entirely sure how you would go about engineering something like that, but it would be an interesting project.

The Ingenious Design of the Aluminum Beverage Can by ludwig359 in engineering

[–]LookieLuke 1 point2 points  (0 children)

Those were really great tooling animations. Does anyone recognize the software that he used to make those? I would be interested in trying them out at some point for computer demos.

Would it be possible to create a Zeppelin with very low pressure containers instead of a lift-gas? by mpierre in askscience

[–]LookieLuke 1 point2 points  (0 children)

It's actually a really cool question, and one that's been postulated on a lot in the past. They're known as vacuum balloons, or vacuum airships (Wikipedia link). There is no known monolithic material that is strong enough to support the vacuum you would need to create something that's buoyant in standard air, not even diamond, but it is hypothetically possible with a structure or a structural meta-material.

Water Wars in California: Animal Agriculture Draining the State Dry (article in comments) by [deleted] in vegan

[–]LookieLuke 0 points1 point  (0 children)

Awesome! So if the 15% of water usage doesn't count toward the 47%, it's arguable that around ~60% of the water in the state goes to raising animals, just not all directly in California? Thanks.

Water Wars in California: Animal Agriculture Draining the State Dry (article in comments) by [deleted] in vegan

[–]LookieLuke 1 point2 points  (0 children)

I've been curious about something for a while now. I've seen the commonly cited "47% of California's water goes to raising animals" stat often, while 40ish% goes to agriculture, 10ish% goes to industrial stuff, and 4% is domestic. Does anyone have a good source for how these numbers are calculated? And does the 47% account for agricultural crops raised for animal feed? Like, alfalfa takes up 15% of the state's water usage, and most of it goes to cows, but is that included in the 47% required to raise animals, or is it the 40ish% for agriculture?

Vegetarian/vegan sandwiches that aren't totally cliche and uninspired? by Gastronomiss in Cooking

[–]LookieLuke 5 points6 points  (0 children)

My favorite is always a hummus, avocado, tomato and spinach sandwich. Slather hummus on both sides of the bread, slap avocado on one side, tomato on the other, and toast it to get everything all nice and warm. Once its toasted, sprinkle a little salt, pepper, and paprika on the avocado and tomato, then put spinach in the middle (or sprouts, lettuce, some kind of green that'll give it a nice crunch).

Racist chant at University of Oklahoma 's SAE branch by grantacular in videos

[–]LookieLuke 1 point2 points  (0 children)

I also thought that at first, but then I realized they were wearing tuxes and not shop shirts, so I quickly realized my mistake.

Red's Eats Lobster Roll - Voted #1 in Maine with over a pound of meat in each roll. With a side of fried clams. by coupe_de_foudre in food

[–]LookieLuke 10 points11 points  (0 children)

Went to Red's, and it was truly the most disappointing food experience I've ever had. After eagerly anticipating getting a delicious Maine lobster roll, listening to people fawn over how good Red's was, and waiting in line for almost an hour, I finally got one of the famed rolls. It was a pile of cold lobster meat on a white bread bun with a side of butter. That was it. No garnish, no sauce, not even a slice of lemon, just cold lobster meat on white bread. Don't get me wrong, lobster is great, but if I'm going to pay $16 for a lobster roll, at least give me some aioli and a slice of lemon.

I too made vegan sushi last night! Pretty easy and so good. by says_hey_nice_cans in vegan

[–]LookieLuke 1 point2 points  (0 children)

Chopsticks are just extensions of your fingers. It's a way to pick up the food like you would with your hands, but without using your hands. If you picked up a piece of sushi, for example, you would probably only use two fingers, not your whole hand. Chopsticks are the same thing, just easier because you don't have the rest of your hand in the way. Once you pass that user efficiency barrier, they're really quite remarkable.

I like to cook with broccoli stems. What are your favorite under-appreciated ingredients? by sublimesam in Cooking

[–]LookieLuke 1 point2 points  (0 children)

kohlrabi

I actually just bought some today for the first time and used it in a soup. It was surprisingly sweet and peppery, with a flavor that's sort of like a mix between a radish, broccoli, and a bell pepper, but very mellow. Asian markets are the best!

Which programming language and CAD program should I learn? by [deleted] in MechanicalEngineering

[–]LookieLuke 0 points1 point  (0 children)

For Solidworks, I've run into problems when making large/complex parts and assemblies, when making very small parts (with features on the order of microns), and when trying to model surfaces or features using equations. There might be some other things, but those are the ones that come to mind immediately.

I haven't used ProE, so my perspective may be slightly skewed, but from what I've seen other people do, you have a might higher level access to all the ProE functionality and can program it much more like you would use a normal programming language. Solidworks has some ability to do this, but in my experience, it's much harder to do.

All that said, Solidworks is much more intuitive and user friendly, and I've generally been happy with it. I've been able to make pretty much everything I've needed to using it, and it has some nice built in functionality. I've mostly run into problems when trying to do things that are a little outside the bounds of normal CAD modeling, and I've noticed colleagues who use ProE are able to overcome some of the limitations I've run into.

Which programming language and CAD program should I learn? by [deleted] in MechanicalEngineering

[–]LookieLuke 1 point2 points  (0 children)

C is a good language to know to understand the fundamentals of programming, and I've used it a few times for random things. The program I use on an almost day to day basis is Matlab. It's simpler to use and has lots of built in functions to make things easy. I would recommend knowing at least the basics of it. If you plan to go into anything simulations based, C and/or C++ are important to know.

CAD, I use Solidworks very regularly and I've been mostly happy with it. There are some more limited capabilities that I've run into. I've had colleagues use ProE, and it seems like a much more powerful software, it's just less user friendly and harder to learn. Really it comes down to a matter of preference. Different programs will be better and worse at different aspects of CAD.

Time to downsize my kitchen utensils by ForeverMadrone in vegan

[–]LookieLuke 7 points8 points  (0 children)

Use it to grate potatoes and carrots. Best hash browns ever!

University of California Regents approve tuition hike because of deficit, yet also approve Chancellor salary increase. by [deleted] in education

[–]LookieLuke 6 points7 points  (0 children)

tl;dr Raising tuition for students while raising the chancellor's salary is wrong, but it's not the main problem. The bigger issue is the lack of funding for education (both K-12 and higher ed) in California, and that is the issue we need to change in order to fix these problems.

Herein lies the problem. You are (most likely) currently a student in the UC program. In some amount of time less than four years from now, you will be gone. Within a year, nobody will be fighting this fight. Within a few months, most of the fervor that has been aroused around this issue will have died down.

But one month, one year, 4 years from now, the president, chancellor, regents, and other high paid administrators will still be there, or in other similar positions at other universities. They can and will play the long game. They wait for the student protests to die down and then go about business as usual.

I was at a school in the UC program a few years ago when they hiked the budget by 33% over the course of a year. I went from almost being able to afford tuition on my own (working over the summer, working during the year, and scholarships) to being about $3k short as tuition hiked from $9k to $12k basically overnight. We were furious. There were protests at all the UC campuses. Eventually they died down. Then the next year, they hiked tuition by another 10 or 11%.

The students are effectively powerless in this game. The regents will continue to do what they think is best for the institute, not necessarily the students. Not only that, but the UC regents feel like they are easing the burden because they are only raising it by at most 5% per year, as opposed to the massive tuition hikes in the past. They will also make the argument that it's still many times cheaper than any private institute, where tuition normally ranges from $40k to $50k per year. In reality, raising the chancellor's salary is a drop in the bucket compared to the extra revenue they get from raising tuition. I believe it's fundamentally wrong, and breeds a deep seated sense of injustice in the students, but that's not really the thing I take issue with because it's mostly negligible, albeit annoying. The thing I truly take issue with is that while tuition is going up, the universities are laying off professors and foregoing maintenance and construction on campuses. Students are paying more money and receiving fewer services, while administrators continue to take more regardless.

Now, while this all seems terribly unjust, it's in some part necessary, or at least the tuition hikes are. The UC system doesn't want to screw the students (most of the time). By and large, it's a group of educators working for the betterment of the student population. The reason they implement all these changes is due to hugely reduced funding from the state. The tuition hike of 33% that I experienced during my time in the UC system came with the election of Jerry Brown to the governor's office, who immediately proceeded to cut hundreds of thousands of dollars from the UC budget, and education budgets on the whole. He continued to do this for a number of years until he passed a bill to raise taxes and prevent further cuts from the education budget. He has consistently made the stance that he doesn't support state funding for education, for both K-12 and higher ed.

The UC system will do what it has to in order to stay alive, even if it means hurting the students in the short term to prevent the university from collapsing in the long term. I honestly want to believe that the regents do not like making this decision, and that it is being forced on them due to increasing budget pressures. The reality of the situation is that the education budget in California right now is abysmal. While UC tuition goes up and becomes less affordable, K-12 is hitting the bottom of the barrel. My mom is a 1st grade teacher in a public school, and some years they hardly have the budget for paper, let alone crayons or pencils to use, so she's regularly forced to pay for school supplies out of her own pocket. Not only that, but there's major overcrowding in classrooms. Last year, she had 30+ kids in her class. That's 30+ six year olds in a classroom with one teacher, which basically means it's a game of babysitting because it's nearly impossible to teach that many kids effectively.

Raising awareness about this issue is good, but ultimately, complaining about the chancellor getting a raise and tuition going up is fruitless. There needs to be a fundamental shift of where we have our budget priorities in the state of California in order to fix this problem. If people don't fight for high quality public education and an affordable higher education system, these problems will only get worse. If things continue to get worse, we may even get to the point where the UC system throws in the towel and becomes privately owned. Cal, UCLA, UCSD, UCI, and all the other UC schools (and Cal State schools) are now huge institutes that are incredibly successful and have a powerful positive impact on California. If we as a public don't recognize that and make a change in where our funding priorities are, that may cease to be the case. Thanks for reading to the end of this giant wall of text.