True's beaked whale.jpg

Western spotted skunk

Hooded skunk

Yellow-throated Marten

Wolverine

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Voronoi diagram blue

Saturday, December 26th, 2020

Make a dish based on Voronoi diagrams. Made an Inkscape extension (jim_voronoi.py) that does recursive Voronoi diagrams with optional Lloyd’s relaxation. Seed point layouts can be random or normally distributed from the edge, center, or two or more foci arranged about half way between the center and edge.

Plan is to make a nonogram outline, and do two levels of Voronoi regions. The first level is normally distributed at the edge, the second level is randomly distributed and has one round of Lloyd’s relaxation. Try several layouts, pick one that looks appealing.


Make the main color opaque blue. Cut with a tile saw, clean up on the grinder. Print out the design on two pages, tape together, and match pieces to the design to check while grinding.

Cut a base glass of 3mm transparent, place over the design, glue the tiles in place. Place paper over the glass leaving the main lines uncovered, use Bullseye True Blue Transparent power. Add Glastac glue to fix in place, remove excess, clean up. Mix Glastic Gel glue with powder, add to edge to give a border. Let dry overnight. Clean up some more, use vacuum to remove excess powder.

Mask main lines with blue tape, add Bullseye Aquamarine Blue Transparent powder to fill in secondary lines. Add Glastac glue to fix in place, clean up excess, and let dry. In places, the powder compressed when the glue was added–add more powder of both colors to fill remaining gaps, let dry, clean up. For detail clean up, hold the vacuum close by and scrap off excess powder / glue.

Fuse on ceramic paper:
400F, 1 hr
1000F, 2 hr
1250F, 1 hr
1250F, 30 min
1465F, 1 hr
1465F, 30 min
960F, 1 hr
960F, 30 min
700F, 75 min
let cool.



Thermo Nicolet IR200 Spectrometer

Sunday, September 9th, 2018

Thermo Nicolet IR200 Spectrometer investigation

Requires a custom power brick, multiple pins. Could not find power specifications. Power bricks do not seem to be available.

Laser was removed from this unit. This is a HeNe laser used “provies the reference signal for triggering data collections and measuring the stroke of the moving mirror.”

Dessicant spot indicates that the dessicant was exhausted. Dessicant appears to be a standard pack. Recharged dessicant in 250F oven for three hours. I’ll try to preserve the optics, I may be able to reuse them.

Requires ENCOMPASS or OMNIC software. I was able to find an OMNIC iso. Untested.

“The interferometer window in your spectrometer is made of KRS-5…” KRS-5 is thallium bromoiodide (TlBr-TlI). KRs-5 (TlBr-TlI) is a gorgeous red crystal commonly used for attenuated total reflection prisms for IR spectroscopy. It is also used as an infrared transmission window in gas and liquid sample cells used with FTIR spectrophotometers in place of Potassium Bromide (KBr) or Cesium Iodide (CsI) for analysis of aqueous samples that would attack KBr or CsI optics. It has a wide transmission range and is virtually insoluble in water. It is a useful alternative to AgCl since it is not photo-sensitive and for ATR applications it will transmit well beyond the 18 micron useful range of ZnSe.

Background on FT-IR:
wikipedia
Nicolet brochure

Unit with case removed:

IR mirror on the left. The right side module looks like a detector:

Back of detector module:

Dry optics compartment:

Dry optics compartment:

Laser diode?:

Corner mirror and flat mirror:

Second corner mirror on solenoid:

Nicolet IR100 and Nicolet IR200 User’s Guide
Nicolet 4700 or Nicolet 6700 User’s Guide
OMNIC User’s Guide, v7.4Transport Kit User’s Guide
Also have “OMNIC- for TIR.iso”
Could not find a service manual.

Links for May 2018

Monday, May 21st, 2018

Cellular Landscapes: Photo-realistic renderings of various cellular structures with interactive features.
Stock Grant Sizes In Pre-IPO Tech Companies
NASA’s 1970s space colony artwork

Beckman DB-G Grating Spectrophotometer teardown

Saturday, November 26th, 2016

Beckman DB-G Grating Spectrophotometer, Cat NO. 1403.

Links: Grating Spectrophotometer DB GT (1961), University of Queensland Physics Museum

Bulbs:
E 871 (3 leads, HID, for UV)
GE 2331 (visible, 5.9V, 4.66A, 25W)

photomultiplier RCA IP28A, 69-04 (Anode supply: 1250V. Voltage between dynode No9 and anode: 250V. D-C anode current: 2.5ma. Ambient temperature: 75 Deg C. Package: 1-5/16″ D x overall length 3-11/16″ long. Seated height 3-1/8″ long. base: 11 pin plug-in with socket and 30″ cable. Note: Specification sheet available. Maybe replaced with 931A, average anode characteristics are the same.)

Photomultiplier board:
Vacuum tubes:
5654
12BH7A

Main board:
Adams and Westlake Mercury Wetted Contact Relay – MWSL-15093-1B
Vacuum tubes (all filaments lighted):
12BH7a
6973
6EM5
6AX5
85A2/0G3
12AX7

Links for November 2014

Monday, November 24th, 2014

Shared DNA / relatedness among close relatives
Analysis of the midterm elections
Climate fiction: When literature takes on global warming and devastating droughts
Origins of BLAST
Charlie Brooks’s kriotherapy leaves me cold
Kryotherapy – Freezing the Balls off a Brazen Quack
Cost of new drug development (and patents), Dean Baker
Officer Darren Wilson’s story is unbelievable. Literally. by Ezra Klein

2014 Hugos

Monday, August 18th, 2014

Nominations

These look interesting:

Best Novel (1595 nominating ballots)
Ancillary Justice, Ann Leckie (Orbit US/Orbit UK)
Neptune’s Brood, Charles Stross (Ace / Orbit UK)
Parasite, Mira Grant (Orbit US/Orbit UK)

Best Short Story (865 nominating ballots)
“If You Were a Dinosaur, My Love”, Rachel Swirsky (Apex Magazine, Mar-2013)
“The Ink Readers of Doi Saket”, Thomas Olde Heuvelt (Tor.com, 04-2013)
“Selkie Stories Are for Losers”, Sofia Samatar (Strange Horizons, Jan-2013)
“The Water That Falls on You from Nowhere”, John Chu (Tor.com, 02-2013)

Best Related Work (752 nominating ballots)
“We Have Always Fought: Challenging the Women, Cattle and Slaves Narrative”, Kameron Hurley (A Dribble of Ink)

The John W. Campbell Award for Best New Writer
Wesley Chu
Max Gladstone*
Ramez Naam*
Sofia Samatar*
Benjanun Sriduangkaew

Winners

Idea: make a microcentrifuge using RC motors

Sunday, March 30th, 2014

The motors made for RC planes and cars are high speed and high power.

For example, the Turnigy Trackstar 1/10 12.0T 3300KV Brushless Motor, $23 specs are:
Kv: 3300
Max Voltage: 15v
Max current: 35amps
Watts: 550
Resistance: 0.0221Ohms
Max RPM: 50000

The load on a microfuge will be greater–22 tubes x 1.5 ml can be roughly 44g, figure a 100g total load with the rotor. So slower than max, but still quite fast.

High power ESC modules are sold to run these motors. So they take DC power, and a servo like signal (PWM), +5, GRD.

So a 10k RPM microfuge can be made with one of these motors + ESC, a servo for locking the lid, and a microcontroller to run it, take speed / time settings, and monitor and show the RPMs on a display.

Power could be from a PC power supply or a dedicated supply.

Setting up libcutter

Friday, February 28th, 2014

On Ubuntu 12.04.

Downloaded from https://github.com/vangdfang/libcutter/.

It was hard to compile, requiring libsvg and several other libraries.
I added to the include directories:

CMakeLists.txt

include_directories(${PROJECT_SOURCE_DIR}/include/ ${PROJECT_SOURCE_DIR}/include/pub /usr/include/freetype2)

Download keys.h from: http://www.jestinstoffel.com/files/keys.h


#ifndef KEYS_H
#define KEYS_H
#define MOVE_KEY_0 1194338851ul
#define MOVE_KEY_1 1563510831ul
#define MOVE_KEY_2 992311905ul
#define MOVE_KEY_3 913389615ul

#define LINE_KEY_0 809461859ul
#define LINE_KEY_1 1902406960ul
#define LINE_KEY_2 1198081403ul
#define LINE_KEY_3 1832133993ul

#define CURVE_KEY_0 0x7D316E22ul
#define CURVE_KEY_1 0x4A4A7133ul
#define CURVE_KEY_2 0x5A3C5C5Ful
#define CURVE_KEY_3 0x78613A61ul
#endif

Full set of keys:

KEY0 - 0x272D6C37, 0x342A6173, 0x3663255B, 0x2B265A4D
KEY1 - 0x7D316E22, 0x4A4A7133, 0x5A3C5C5F, 0x78613A61
KEY2 - 0x47302A23, 0x5D31482F, 0x3B257A61, 0x3671382F
KEY3 - 0x303F6863, 0x71646D30, 0x4769457B, 0x6D342569
KEY4 - 0x45356650, 0x3A386D69, 0x575A7037, 0x335F357D
KEY5 - 0x343A2148, 0x614F3925, 0x753F6953, 0x47463626
KEY6 - 0x3F62626D, 0x7E555F44, 0x7E29425A, 0x52246268
KEY7 - 0x47302A23, 0x342A6173, 0x4769457B, 0x335F357D

Replaces include/pub/keys.h

./util/draw_svg ./util/svg_tests/Mini_DIY_circuit.svg /dev/ttyUSB0

Test run, worked!

Other options:
Freecut — Firmware replacement, haven’t tried.
Licut –Tried binaries and program compiled from source, did not work.

Cricut dissection, discusses the default blank cartridge.
ATX Hackerspace cricut page
Repair info
Build-to-spec Cricut Hacks Wiki (recovered from the Internet Archive)

Dinosaur coloration

Thursday, January 9th, 2014

In the last decade or so, dinosaurs have started being depicted as brightly colored. The reason for the trend of brightly colored dinosaurs in movies is that in recent years techniques for identifying pigments from fossils have been developed, using electron microscopy and ion bombardment mass spectrometry.

News report: Ancient Pigments Unearthed: Fossilized skin reveals the colors of three extinct marine reptiles by Ed Yong. The Scientist, January 8, 2014
Original article: (Abstract) Skin pigmentation provides evidence of convergent melanism in extinct marine reptiles. Lindgren et. al., Nature 08 Jan 2014

and news report: Pictures: Dinosaur True Colors Revealed by Feather Find, Chris Sloan, National Geographic Daily News
Original article: Zhang et. al., 2010

Fossil color studies were pioneered by Jakob Vinther at Yale

No doubt movie speculation is running far ahead of the science, but these are the discoveries that unleashed the trend of brightly colored dinosaurs. At this point, it is reasonable to think dinosaurs are as brightly colored as birds or reptiles are today, and in some cases the coloring of specific species is known.

Ideas: sensors

Thursday, January 2nd, 2014

Further notes on using digital camera sensors as high density multimodal sensor arrays.

1) Detect loading / strain using a module incorporating a strain sensor (e.g. the resistive type used in scales and strain gauges) to a diode. The diode is coupled to a fiber optic line that takes the signal to the camera.spectrometer.

2) Position sensors. Use an arc of partially clear plastic that has a light at one of the ends at the arc edge. A fiber optic line at the oriented normal to the arc gathers light that takes the signal to the camera. As the joint moves, the plastic arc moves and distance between the light and the fiber optic changes. This change is converted to a position.

For joints with 360 rotation, the arc of plastic is replaced by a disk. The light source is placed at the center, and an opaque radial line gives each position of the disk a different light intensity.

3) Touch sensors. Use my previous idea of an array of sensors embedded in a squishy and translucent layer with one or more light sources. Touch distorts the light path of direct or reflected light between the light source(s) and sensor in reproducible ways. The set of sensors is trained to recognize the pattern of light formed by different touches. The pattern may also be changed by movement of the surface, for example if the array of sensors covers a hand, and could bed used to detect hand position.

4) An array of fibers can be placed to collect light from a spectrometer. An array of spectrometers can be developed using this approach, as the camera can collect light from several 1D fiber optic arrays.