post processing – Could someone help me identify what this piece of film might be used for

There’s one most likely choice for the origin and application of this transparency, and a second somewhat less likely one.

The likeliest (because of the tape on the edges) is that this was a transparency intended for use on an overhead projector (these were the commonest way to do presentations that involved writing or drawing, live for a large group), and would have been part of a presentation, either about spaceflight in general, about the Apollo program, or about Earth (from a NASA standpoint). This film piece would have been simply laid on the projection glass, and the optics of the projector would put it on the screen. Overhead projection is the most likely because by the 1970s, 4×5 format film projectors were already a rarity (35mm and medium format projectors were still common).

Next most likely is that it was a promotional piece, either intended for sale in a gift shop (to be viewed in a light box or incorporated into a lamp shade or similar, perhaps) or for direct sale to the public as part of NASA’s self-promotion programs.

It’s very unlikely that it’s an original, most tellingly because Apollo never carried large format camera gear — they carried Hasselblad cameras, shooting 6×6 cm format (56mm square actual image area) on 70mm double perforated film; if this were an original, it would be smaller than it is and have perforated edges. That makes it a copy, and copies weren’t generally used for science — but iconic images like that one went far to promote NASA and their scientific missions to the general public.

film – Could someone help me identify what this piece of filem might be used for

There’s one most likely choice for the origin and application of this transparency, and a second somewhat less likely one.

The likeliest (because of the tape on the edges) is that this was a transparency intended for use on an overhead projector (these were the commonest way to do presentations that involved writing or drawing, live for a large group), and would have been part of a presentation, either about spaceflight in general, about the Apollo program, or about Earth (from a NASA standpoint). This film piece would have been simply laid on the projection glass, and the optics of the projector would put it on the screen. Overhead projection is the most likely because by the 1970s, 4×5 format film projectors were already a rarity (35mm and medium format projectors were still common).

Next most likely is that it was a promotional piece, either intended for sale in a gift shop (to be viewed in a light box or incorporated into a lamp shade or similar, perhaps) or for direct sale to the public as part of NASA’s self-promotion programs.

It’s very unlikely that it’s an original, most tellingly because Apollo never carried large format camera gear — they carried Hasselblad cameras, shooting 6×6 cm format (56mm square actual image area) on 70mm double perforated film; if this were an original, it would be smaller than it is and have perforated edges. That makes it a copy, and copies weren’t generally used for science — but iconic images like that one went far to promote NASA and their scientific missions to the general public.

interactive – Lock focus on cell / Identify reason for loss of focus

The code at the end of this post is a snake game. It’s a Dynamic Graphics wrapped in an EventHandler that responds to arrowkeys. A ScheduledTask does the logic five times a second. I hit shift-enter to create it, and click the Graphics with my mouse (border turns orange) to start controlling it.

However, once the score hits 10, the Notebook is no longer focused on the cell (border no longer orange) and key input stops. Loss of focus also happens if I uncomment the bezier curve drawing — perhaps excess computation in the task is causing it. Something that continually directs focus to the particular cell, i.e. having FrontEnd`MoveCursorToInputField in updatetask is not desired; I want to prevent unintentional loss of focus. Functions to help track focus in the Notebook would be useful too.

ClearAll(food, snake, dir, lastdir, updatetask, empty, 
reserverandomlocation, reserve, score)
empty = Flatten(Table({i, j}, {i, 0, 9}, {j, 0, 9}), 1);
reserve(point_) := (empty = DeleteCases(empty, point); point); 
reserverandomlocation() := reserve@RandomSample(empty, 1)((1)); food =
  reserverandomlocation(); snake = {reserverandomlocation()}; dir = 
{Cos@#, Sin@#} &@((RandomInteger(3) (Pi))/2); lastdir = {0, 
  0}; score = 1; updatetask = 
 SessionSubmit(
  ScheduledTask(lastdir = dir; 
   With({new = (Mod(#, 10) &) /@ (snake((1)) + dir)}, 
    If(food == new, ++score; food = reserverandomlocation(), 
     AppendTo(empty, Last@snake); snake = Most@snake); 
    If(MemberQ(snake, new), dir = {0, 0}; TaskRemove@updatetask, 
     PrependTo(snake, reserve@new))), Quantity(.2, "Seconds")));
EventHandler(
 Dynamic@Graphics({{Blue, snake, Red, food, Black, 
      empty} /. {a_ /; NumericQ@a, b_ /; NumericQ@b} :> 
      Rectangle({a, b}, {a + 1, b + 1}), Black, 
    If(dir == {0, 0}, Text("dead", snake((1)) + {1/2, 1/2}), 
     Arrow({# - dir/3, # + dir/3} &(snake((1)) + {1/2, 1/2}))), 
    Text(ToString(score), food + {1/2, 1/2})(*,BezierCurve(#+{1/2,1/
    2}&/@#)&/@Split(snake,Norm(#-#2)(LessEqual)Sqrt(2)&)*)}), 
 MapThread(#2 <> "ArrowKeyDown" :> 
    If(Norm(# - lastdir) < 2, dir = #) &, {CirclePoints({1, 0}, 
    4), {"Right", "Up", "Left", "Down"}}))

P.S. how do you input grave in code? Certainly not like this &#96;.

mining pools – how to identify as soon as possible that a new block was mined

From the miner perspective: You have a worker, fetching data from a full-node with getblocktemplate to create a candidate block and push it to the miners, to effective mine it. As soon as your miner is done mining a candidate, it asks for more data. However if the block being mined now, was submitted by another miner, all miners should stop to work in the current block and pull data from worker.

How can the worker identify as soon as possible that a new block was mined? Monitor if the height on the results from getblocktemplate changed? Monitor if previous hash changed? Monitor if at least X confirmations happened?

sharepoint online – How to Identify and Terminate a Specific Approval Workflow from Another Flow

I’m creating an approval workflow using Power Automate for SharePoint Online.

I would like the workflow to be closed when the user presses the “Cancel” button in PowerApps while waiting for the first approver to approve.
In order to do this, I think I need to create another Flow that will work when the “Cancel” button is pressed.

Is there any way to find the workflow that is pending?
I would be very grateful for any idea/pointers.

spells – What is the mechanic of the check when using detect magic, Greater to identify magical signature?

Detect magic, greater says:

You can recognize this signature if you succeed at a Spellcraft check when later identifying a spell to determine whether or not that spell was cast by the same individual.

I am confused what is the mechanic for the DC and other functions for identifying spells signature features:

  • isn’t it supposed to be a knowledge (arcana) to recognize spells currently in effect?
  • is the DC calculated using spellcraft skill’s “identify spell as it being cast” math or the one presented previously on the spell regarding “identify last spell cast by creature” effect of the spell?

fa.functional analysis – Identify input maps corresponding to control system ($A,B$), where $B = delta_0$

The text I’m struggling with comes from “Observation and Control for Operator Semigroups” by Tucsnak and Weiss, page 119.
Take $X = L^2(0,infty)$ and let $X_{-1}$ be the dual of the Sobolev space $H^1(0,infty)$ with respect to the pivot space $X$. Let $(A,B)$ be a control system with $A = -frac{d}{dx}$ with $D(A) = H^1_0(0,infty)$ (space of those functions in $phi in H^1(0,infty)$ for which $gamma_0(phi) = 0$), it generates the right shift semigroup on $X$, which can be extended to a semigroup on $X_{-1}$ denoted by $T_{-1}$. In the book, it is written that the space $mathcal{L}(mathbb{C},X_{-1})$ can be identified with $X_{-1}$. Then, authors define $delta_a$, an element of $X_{-1}$, by $delta_a(phi) = phi(a)$ for $phi in H^1_0(0,infty)$. The control operator in this problem is $B = delta_0$ and I don’t understand where does this identification between $mathcal{L}(mathbb{C},X_{-1})$ and $X_{-1}$ came from, we need it, because $B$ should be in $mathcal{L}(mathbb{C},X_{-1})$.

Another thing is, we need to specify input maps, that is $Phi_{tau}u = int_0^{tau} T_{-1}(tau – sigma)Bu(sigma) dsigma$. They write, it is not difficult to check that
begin{equation}
(Phi_{tau}u)(x) = begin{cases}
u(t – x)qquad & text{for } x in (0,t),\
0qquad & text{for } x geq t.
end{cases}
end{equation}

I don’t seee where this came from, possibly because I don’t understand the way $delta_0$ turns into $B$, an element of $mathcal{L}(mathbb{C},X_{-1})$.

Platform Identifier – Identify & Sorting Done QUICK!

Hello!
Another little tool to add to the collection to help you identify & sort those link lists.
YOU tell the software what to use to identify using both a powerful inUrl and inHtml method.
Webpage: https://www.platform-identifier.xyz/
Best Regards

identify sequence in a list

You can create a list of subsequences of length 3 using Partition and use Nearest with distance function Norm(# - #2, Infinity) &

nF = Nearest(Partition(megalist, 3, 1) -> {"Element", "Index"}, 
  DistanceFunction -> (Norm(# - #2, Infinity) &))

enter image description here

The function nF(x) returns the subsequences of megalist and their positions nearest inpit x.

There are no subsequences within distance .1 of minilist:

nF(minilist, {All, .1})
{}

There are 2 within distance .25:

nF(minilist, {All, .2})
{{{0.473371, 1.18655, -0.703937}, 4590}, 
{{0.473238, 1.2483, -0.690072}, 6032}}

Does SharePoint listitem have a tag or hash to identify if the version still persists?

I’m having a problem with multiple people modifying the same item at the same time. In my event receiver (ItemUpdating) I’m taking some of the data and I write it to a separate sql.

If a saving clonflict occurs the data is written to sql, but only the changes in SharePoint from the first person will be stored.

Is there a hash, tag, metainformation associated with a ticket which I can check if the version in the event receiver is still equal to the one on the server? Before I write data to the external sql I want to make sure there will be not saving clonflict after ItemUpdating is ran.

Thank you