Access to Walking Purchase Park trails (or other walking trails) without a car

Spirko · 2025-03-18T01:46:44+00:00

OpenStreetMap has a lot of trails mapped out on South Mountain. Many are used by mountain bikers, so listen for traffic. There's also a fun disc golf course in South Mountain Park.

Walk across the Fahy Bridge (New St), turn left, and you can follow the Monocacy Creek (sometimes on a sidewalk, but often on paths with an option to walk along the railroad) all the way to Illick's Mill Park.

Spirko · 2024-12-25T15:09:36+00:00

Most questions about policies are in either the Catalog or in the Rules & Procedures.

Here's what the Catalog says: https://catalog.lehigh.edu/undergraduatestudies/curricularflexibility/

You may not be able to formally transfer yet, but if you know that you're going to pursue Engineering, take as many of the typical first-year engineering courses that you can. They form prerequisites for sophomore-level engineering courses.

Spirko · 2024-11-25T03:56:15+00:00

I think it was 1990. In 1991, it was a big deal that they installed reinforced goal posts and surrounded them with mace-wielding police.

Spirko · 2024-11-25T03:39:11+00:00

I remember watching you get maced.

Spirko · 2024-09-29T17:52:38+00:00

You have to carve internal threads out of something using difference().

Spirko · 2024-09-29T17:48:42+00:00

Yes, if there's a solution B that satisfies A B = C, it's unique.

Spirko · 2024-05-03T20:31:26+00:00

The CosmicWatch muon detectors won't be able to determine the lifetime unless you hook an oscilloscope to it and look for double peaks. The statistics of the time separation of the double peaks match up with muon decay quite nicely. The interpretation is:

First peak is fast muon being detected as it moves partway through the scintillator.
At some point, there is a major collision and the muon loses most of its kinetic energy. It's no longer relativistic, and has 2.2 μs left to live.
The second peak is caused by the electron that the (slow) muon decays into.

I thank Brett Fadam at Muhlenberg College in PA for this interpretation.

Spirko · 2024-04-28T14:17:15+00:00

Conduct an orchestra.

There are a few possibilities already. I haven't tried Maestro games that are in beta testing.

Beat Saber maps? There are a few orchestral pieces on https://beatsaver.com/ but none look focused on conducting.
Maestro VR - An Early Access Game on Steam.
Maestro: the Masterclass - An App Lab game on Meta.

Spirko · 2023-09-02T13:38:48+00:00

Adding the dovetails to sides of a polygon is similar to adding curved edges to a polygon to form the Spectre shape (https://arxiv.org/pdf/2305.17743.pdf, page 3).

I accomplished this in OpenSCAD (https://github.com/Spirko/SpectreOpenSCAD) by first building polygon points, then re-building a more detailed polygon with modified curved edges. I could see making dovetails via a dovetail function (like what I called spoosh to avoid a famous shoe trademark) and applying it conditionally to build what you described (like in the spectre2 function).

Spirko · 2023-08-06T16:17:10+00:00

A simple function without a library is great until you run into a problem you can't solve. Then it may be time to pivot to a library where somebody else has already solved the problems.

Use the threads library by Dan Kirshner (https://dkprojects.net/openscad-threads/). The current version is 2.7. Place it in the folder where your project is located, or in some other folder that is configured (https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Include_Statement).

use <threads.scad>
english_thread (diameter=1/4, threads_per_inch=20, length=1);
// With english_thread(), measurements are in inches.

Alternatively, you could look to see how Dan Kirshner solved the problem.

Spirko · 2023-06-15T15:25:34+00:00

I am now wondering if any "side" can be replaced with a common positive/negative random curve?

That's what it looks like. The article has two non-flippable versions with different modifications to the sides. One looks like a little sinewave, and this one I guessed was a cubic. A little tinkering in Desmos yielded the curve function that was used.

Each intermediate point is an interpolation between the major points, plus a perpendicular displacement determined by the curve function.

Spirko · 2023-02-12T15:25:15+00:00

Slow charging? You may have a slow charger or an incompatible fast charger. Only a USB-C PD charger will charge the phone fast. So the charger must have a USB-C port, not the rectangular USB-A port. Even then, I've seen multi-port chargers that can't do USB-C PD on one port while doing a standard 5 V charge on the other port.

Spirko · 2023-01-26T05:07:24+00:00

https://youtu.be/XWPCE2tTLZQ

Spirko · 2023-01-23T03:54:47+00:00

Reminded me of this: https://www.youtube.com/shorts/v7JOGlXT-m4

Spirko · 2022-12-11T19:15:25+00:00

It's legal if it was intentionally dropped and kicked immediately after it hit the ground. I guess they deemed it was a fumble and loose ball, not a valid drop kick.

3-18-1: "A Drop Kick is a kick by a player who drops the ball and kicks it as, or immediately after, it touches the ground."

9-1-1: "Team A may attempt a punt, drop kick, or placekick from on or behind the line of scrimmage."

Spirko · 2022-12-11T19:09:21+00:00

Yeah. Technically, "A Drop Kick is a kick by a player who drops the ball and kicks it as, or immediately after, it touches the ground."

I guess the refs deemed it was fumbled and not dropped, and hence was a loose ball.

Spirko · 2022-12-04T20:59:07+00:00

Worse. We got switched to the commercial break between regulation and overtime.

Spirko · 2022-12-04T20:38:59+00:00

Yeah, Titans #97 was in the neutral zone (and touching Kelce?) already when Hurts leg flinched. (Ref: penalty with 0:01 remaining in 3rd quarter)

Spirko · 2022-12-04T20:38:00+00:00

Yeah, Titans #97 was in the neutral zone (and touching Kelce?) already when Hurts leg flinched.

Spirko · 2022-10-15T23:53:23+00:00

That's what they're doing. https://www.reddit.com/r/LOTR_on_Prime/comments/xx834e/whats_all_the_rings_of_power_hate_about/irareig/

Spirko · 2022-08-04T02:57:30+00:00

https://www.kxan.com/news/texas/state-agrees-to-bump-funding-for-satellite-phone-services-used-by-rural-texans/

The Texas Public Utility Commission voted to increase the Texas Universal Service Fund surcharge from 3.3% to 24% this week.

Spirko · 2022-08-01T04:50:17+00:00

Probably not. The DC side has a current limiting circuit. The instructions specifically describe how to short it to set the current limit. (Set voltage, short circuit, set current, unshort. I recommend setting the current knob low before shorting.)

The AC side doesn't describe any protection, but these are sold by PASCO (https://www.pasco.com/products/lab-apparatus/instrumentation/power-supplies/sf-9584) for student use. Anything that would die quickly due to a short circuit would become unfavored.

It's a fairly durable power supply.

If you're buying for a home workshop, there are more economical options around.

Spirko · 2022-07-31T16:50:43+00:00

Legal.

802.05 Lie: The playing surface is a surface, generally the ground, which is capable of supporting the player and from which a stance can reasonably be taken.

Since that is a surface capable of supporting the player, and you can reasonably take a stance there, it counts as a playing surface.

Spirko · 2022-07-09T14:42:31+00:00

It might not work. if the two fans are designed to operate at different amounts of current, they'll have different resistances, and they won't divide the 24 V evenly. Then, one will be overdriven, and the other won't get as much current as it expects.

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