difference between SAXS and WAXS

Small-angle x-ray scattering (SAXS) is elastic scattering of monochromatic x-rays on small scattering angles (up to a few degrees) and wide-angle x-ray scattering (WAXS) is the same on larger scattering angles. X-ray diffraction is a type of WAXS (or sometimes also SAXS), where the scattering arises from crystals and produces Bragg peaks (diffraction peaks) as a function of the scattering angle (or spots or rings in 2D patterns). In single crystal diffraction the diffraction is only from one large crystal and the diffraction pattern is recorded in 2D.

The basic difference between SAXS and WAXS is the lengthscale they correspond to: WAXS detects ordering of individual atoms and SAXS probes larger structures based on electron density differences (e.g. proteins in solution or pores in a solid matrix). When using transmission geometry and a 2D detector, switching between SAXS and WAXS can be easily done by moving the detector closer to the sample.

source: https://www.researchgate.net/post/What_is_the_difference_between_SAXS_and_WAXS

distinguishing PTFE and 'Teflon'

Teflon is the best-known brand of PTFE.

PTFE film is a non-stick coating. PTFE tape is useful for sealing threads for pneumatic interlocks.



source: https://en.wikipedia.org/wiki/Polytetrafluoroethylene

SR44 vs LR44 coin cell batteries

Typically found in Calipers.


Digital calipers use a silver oxide button cell, typically the SR44 size, aka 357, 11.6mm diameter by 5.4mm high. A genuine SR44 or 357 cell is hard to find, and the alkaline LR44, which is the same size button, and same nominal voltage, is very common and easy to find. This alkaline LR44 cell is put into toys, laser pointers, etc., and has gotten very cheap because of the large quantities made in China. However, alkaline buttons have much less mAh capacity, and have a critical weakness when used in devices like digital calipers that quit working when battery voltage falls. Alkaline cells quickly "droop" their voltage (they have a non-flat discharge curve), compared to silver oxide, and thus don't run calipers for very long before the display fades or blinks from low voltage.

TLDR: SR44 lasts longer but rarer + more expensive. Difference due to constituent materials. Otherwise geometry and purpose is the same.

source: http://www.truetex.com/buttons.htm

tin-cure vs platinum-cure silicone mold making rubbers

The chemical difference between tin-cure (condensation cure) and platinum-cure (addition cure) silicone mold making rubbers lies mainly in the metal used to catalyze or cure the base rubber. The metal tin is used to catalyze or cure tin silicone, and platinum is used to cure platinum silicone rubber. Accordingly, tin-cure silicone rubbers are usually significantly less expensive than platinum-cure ones.


Considerations:
. Inhibition (due to impurities or contaminants)
. Shrinkage
. Library life
. Production life


source: https://www.smooth-on.com/support/faq/184/

quick method to add error bars and standard deviations to excel graphs

new excel (since 2013?) has an easily accessible button at the top-right of a chart that allows you to quickly add std error/deviation.





source: https://www.pryor.com/blog/add-error-bars-and-standard-deviations-to-excel-graphs/

shaded error bars in excel

summary: specify the upper/lower bounds using the error of your choice, plot those along with the primary data, then use transparency for the top bound to get the color effect and white-fill to remove what's below the bottom bound.

one comment to add to the below source is that depending on the order your data is loaded into the plot, you may need to switch up the order of the data series to obtain the correct appearance. however, top > data > bottom always in the order.


example:



source: https://nikkimarinsek.com/blog/tutorial-how-to-make-shaded-error-bands-in-excel

radar/spider charts in excel

In Excel 2013, click Insert > Insert Stock, Surface or Radar Chart > Radar.


example:



source: https://www.extendoffice.com/documents/excel/2135-excel-create-radar-chart.html

transparency of features within a part - reversing back to non-transparent

shift + left click to select
shift + right click to bring up option menu.

(might differ depending on keyboard mappings since the thread says tab+click)


source: https://forum.solidworks.com/thread/52713

Checking amazon spending history totals

Download entire order history (or specified dates) as excel file and calculate.

https://www.amazon.com/gp/b2b/reports

source: https://clark.com/shopping-retail/online-shopping/amazon-spending-history-total/

MD5 file extension

Files that contain the .md5 file extension are checksum files that are used to ensure that the data within a file is complete and has not become corrupt. An MD5 file verifies the integrity of downloaded files, discs and disk images.

source: https://file.org/extension/md5

Mac - OS version from command line

system_profiler SPSoftwareDataType

OR

sw_vers

There are others but I found these two to be the most informative.

source: https://coderwall.com/p/4yz8dq/determine-os-x-version-from-the-command-line

ASUS laptop - keyboard backlight

use physical keyboard shortcuts rather than digital keyboard settings.


source: https://rog.asus.com/forum/showthread.php?1106-Can-t-seem-to-turn-on-keyboard-backlight-on-G53

Recover old events in google calendar (within 30 days)

as of 2018:

--> gear icon --> trash --> [select calendar]

source: https://productforums.google.com/forum/#!topic/calendar/MtNndu_xd2E

Hide completed tasks in Asana/Instagantt

--> show incomplete

source: https://community.asana.com/t/completed-tasks-just-fading-instead-of-disappearing/3420

Python pip package RequestsDependencyWarning - cryptography

Error:

 /usr/local/lib/python2.7/dist-packages/requests/__init__.py:83: RequestsDependencyWarning: Old version of cryptography ([1, 2, 3]) may cause slowdown.

Solution:

sudo pip install --upgrade cryptography

sudo python -m easy_install --upgrade pyOpenSSL




source: https://stackoverflow.com/questions/51283708/python-pip-package-requestsdependencywarning-when-installing-elastic-search-cura

Recover unsaved files in Sublime Text

Open %APPDATA%\Sublime Text 3\Local in a folder and open the Session.sublime_session file in a text editor. If you're lucky, extract the save data without additional hassle (may need to reformat).

source: https://forum.sublimetext.com/t/how-to-recover-lost-unsaved-files/18673

Driver Installation Issue with BeagleBone Black (generalizable to any failures of installation of unsigned drivers)

Installation of Windows 10 Bone_D64.exe was failing.

Reason turned out to be:
Microsoft OS no longer allows direct installation of unsigned drivers to reduce access by malware. (there might be more to this...)


Solution:
> Updating the BIOS did not work for me, but installing RNDIS drive worked
> with the following instructions (found somewhere else that I cannot find
> now)
>
> device manager
> Under other devices choose RNDIS
> right click on it and update driver
> Browse my computer
> let me pick
> "Network adapters"
> select microsoft from on the left
> choose "USB RNDIS"
> Click next
> click yes
> then close
> DONE!!! YEAH !!!

source: https://groups.google.com/forum/#!category-topic/beagleboard/usb/-gczCwKR2Rk

Fixing when a file exceeds github's file size limit of 100 mb

git filter-branch --index-filter 'git rm --cached --ignore-unmatch [file]' merge-point..HEAD

source: http://www.thisprogrammingthing.com/2013/fixing-the-this-exceeds-githubs-file-size-limit-of-100-mb-error/

changing the last commit message without committing newest changes

git commit --amend -m 'Your new message.'

source: https://stackoverflow.com/questions/11286362/changing-the-last-commit-message-without-committing-newest-changes

Git: .lock error while pushing [to origin]

My solution was re-creating the index (while keeping the worktree intact):

del .git\index
git reset --mixed head

source: https://stackoverflow.com/questions/13635429/git-rename-from-index-lock-to-index-failed

Host-Only Networking with VirtualBox

This will allow the guest system to access the broader internet through your host’s connection. You’ll be able to download packages, check email; whatever. Nobody outside sees anything of your guest system; as far as they’re concerned, it doesn’t exist. However, you cannot access any guest resources from your host machine, nor can any guest machines access each other. Yet.

source: http://christophermaier.name/2010/09/01/host-only-networking-with-virtualbox/

Debugging Samsung S8

various tips on restarting and booting in safe mode.

source: https://thedroidguy.com/2018/04/fix-samsung-galaxy-s8-wont-charge-troubleshooting-guide-1072340

Changing default font/spacing/etc in Microsoft Word

make changes to a document, apply changes to all (Normal.dotm) by setting as default.


source: https://www.cedarville.edu/help/Word-Change-Default-Line-Spacing

Powerpoint - multiple, simultaneous, automatic videos

Open up the animation pane and clear all other triggers/actions (source: https://support.office.com/en-us/article/change-the-playing-order-of-your-animation-effects-f41984c7-c5a6-4120-af1e-5208cf4295b4).

Select all videos on the slide that you want to play simultaneously. In the Animations tab, hit play. Right click on any of the selected videos and change to start 'Automatically'.

related: https://answers.microsoft.com/en-us/msoffice/forum/msoffice_powerpoint-mso_other-mso_2010/powerpoint-how-can-i-automatically-play-two-video/eb19132f-2f49-48ae-94f6-59c1be8460b2

SolidWorks - customize keyboard shortcuts

To customize shortcut keys:

1. With a document open, click Tools > Customize, or right-click in the window border and select Customize.
2. Select the Keyboard tab.

source: http://help.solidworks.com/2017/english/solidworks/sldworks/hidd_customize_keyboard.htm

SolidWorks - disable resource monitor notification

Access the Windows Notifications Settings
To quickly access Windows Notification settings you can enter ‘Notification‘ into the search box next to the Windows icon on the left of the task bar (if the Search Box is missing right-click on the task bar and select Cortana > Search Box).

Then select Notifications & action settings from best match list:

Choose which SOLIDWORKS Resource Monitor Notifications to receive
In the notifications and actions dialog scroll in the list until you find the SOLIDWORKS Resource Monitor (if it’s not listed then you likely do not have SOLIDWORKS running , just start the application and it should appear).

Pick on the item to access it’s settings — or you can just turn them all off by moving the slider to off.

In the SOLIDWORKS Resource Monitor settings dialog you can then pick and choose which notifications you want to receive and how you want to receive them. For instance you still might want to receive all notifications but you can do so without a sound by turning play the sound to off:



source: https://www.javelin-tech.com/blog/2017/03/disable-solidworks-resource-monitor-notifications/

Deleting custom power plans

Click Start, and type power options.

Click Power Options.

Click Change Plan Settings under the plan you want to delete.

Click Delete This Plan and then OK.
Note: The Delete This Plan option only appears on plans you have created and that are not currently in use.

--> Can't delete the current plan that you're on.

source: http://www.dell.com/support/article/us/en/04/sln85974/changing-creating-or-deleting-my-power-plan-settings-in-microsoft-windows-vista-kb-article-316355?lang=en

Unpairing a bluetooth device

Some smaller bluetooth devices seem to support only one link at a time (i.e. bluetooth mouse).


Click the Bluetooth icon in the notification area and choose the command Show Bluetooth Devices.

Right-click a device in the window.

The device doesn’t need to be on to be unpaired. You’ll notice that the devices show up in the window regardless of whether they’re on.

Choose the command Remove or Remove Device.

Click the Yes button in the Remove Device dialog box.

If prompted, type the administrator’s password or click the Continue button.


source: http://www.dummies.com/computers/pcs/how-to-unpair-a-bluetooth-device-on-your-windows-network/

git fatal: HttpRequestException encountered in cygwin

fatal: HttpRequestException encountered.
   An error occurred while sending the request.
bash: /dev/tty: No such device or address
error: failed to execute prompt script (exit code 1)
fatal: could not read Username for 'https://github.com': No error

^While using git in cygwin.

Solution: Use powershell or command prompt instead.

source: https://github.com/atom/atom/issues/8984

Compiling Makefiles in Windows

Cygwin works. You'll have to manually enable 'gcc' and 'make' installations.

source: https://stackoverflow.com/questions/2532234/how-to-run-a-makefile-in-windows
https://stackoverflow.com/questions/4828388/cygwin-make-bash-command-not-found