Changes in 2a8afcb: robot

				Tech-dat/encryption-dat/encryption-dat.md
			
          @@ -3,6 +3,12 @@

           - [[lora-sdk-dat]]

          +[[USB-dat]] - [[encryption-key-dat]] - [[encryption-dat]]

          +

          +

          +RSA/ECC, DES/3DES, AES, SHA1/256/384/512

          +

          +

           ## AES encryption 

           ![](2025-06-26-19-15-28.png)

				app-dat/encryption-key-dat/2026-02-22-16-12-42.png
			
          Binary files /dev/null and b/app-dat/encryption-key-dat/2026-02-22-16-12-42.png differ

				app-dat/encryption-key-dat/encryption-key-dat.md
			
          @@ -0,0 +1,19 @@

          +

          +# encryption-key-dat

          +

          +

          +[[USB-dat]] - [[encryption-key-dat]] - [[encryption-dat]]

          +

          +

          +![](2026-02-22-16-12-42.png)

          +

          +- T2000

          +- SSX1108 - [[patent-dat]] == https://patents.google.com/patent/CN103246494A/zh == 一种抵抗能量分析和错误攻击的安全模幂计算方法

          +

          +https://www.aisinochip.com/index.php/product/show/id/24/catid/126.html

          +

          +智能安全芯片 == ACH512是一款基于安全算法的高性能SoC芯片，广泛应用于税务、大容量存储、高速USBKEY、物联网、生物识别市场。

          +

          +- [[aisinochip-dat]]

          +

          +

				app-dat/robot-dat/robot-dat.md
			
          @@ -6,7 +6,7 @@

           - [[robot-joint-dat]] == [[motor-gimbal-dat]] - [[encoder-dat]]

          -

          +- [[robot]]

           ## types 

          @@ -15,8 +15,10 @@

           - palm 

           - vision rover 

           - educational robot 

          -- Humanoid robot

          -- robot dog 

          +- [[robot-Humanoid-dat]]

          +- [[robot-dog-dat]] 

          +

          +

           ## system

				chemistry-dat/2026-02-22-16-18-24.png
			
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				chemistry-dat/2026-02-22-16-18-34.png
			
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				chemistry-dat/chemistry-dat.md
			
          @@ -0,0 +1,36 @@

          +

          +# chemistry-dat

          +

          +## Nitric Acid (HNO₃)

          +

          +**Nitric Acid** is a powerful, highly corrosive mineral acid. In its pure form, it is colorless, but older samples often take on a yellow cast due to decomposition into oxides of nitrogen and water.

          +

          +---

          +

          +### 🧪 Industrial and Laboratory Applications

          +

          +Nitric acid is a fundamental chemical building block used across several major industries:

          +

          +#### 1. Agriculture (Fertilizers)

          +The largest share of nitric acid production goes toward creating **Ammonium Nitrate** ($NH_4NO_3$). This is a high-nitrogen compound essential for global crop production.

          +

          +#### 2. Explosives and Munitions

          +It is a primary reagent in the "nitration" process used to manufacture explosives, including:

          +* **TNT** (Trinitrotoluene)

          +* **Nitroglycerin**

          +* **Gun cotton** (Nitrocellulose)

          +

          +#### 3. Metallurgy and Etching

          +* **Pickling:** Used to remove oxidation and impurities from the surface of stainless steel and other alloys.

          +* **Etching:** Used in printmaking and jewelry to eat into the unprotected parts of a metal surface to create a design.

          +

          +

          +#### 4. Rocketry

          +**Red Fuming Nitric Acid (RFNA)** is used as an oxidizer in liquid-fuel rockets, particularly in tactical missiles and older space launch vehicles.

          +

          +![](2026-02-22-16-18-24.png)

          +

          +![](2026-02-22-16-18-34.png)

          +

          +## ref 

          +

				fab-dat/fab-product-dat/fab-laser-cutting-dat/2026-02-22-16-05-10.png
			
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				fab-dat/fab-product-dat/fab-laser-cutting-dat/fab-laser-cutting-dat.md
			
          @@ -0,0 +1,6 @@

          +

          +# fab-laser-cutting-dat

          +

          +laser cut 

          +

          +![](2026-02-22-16-05-10.png)

          \ No newline at end of file

				mechanics-dat/mechanical-parts-dat/Nut-dat/Nut-dat.md
			
          @@ -1,6 +1,8 @@

           # Nut-dat

          +- [[nut-t-dat]] - [[nut-thumb-dat]] - [[nut-dat]]

          +

           - 螺母

				mechanics-dat/mechanical-parts-dat/Nut-dat/nut-thumb-dat/2026-02-22-16-07-56.png
			
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				mechanics-dat/mechanical-parts-dat/Nut-dat/nut-thumb-dat/nut-thumb-dat.md
			
          @@ -0,0 +1,15 @@

          +

          +

          +# nut-thumb-dat

          +

          +

          +- [[screw-thumb-dat]] - [[nut-thumb-dat]] - [[product-dat]] - [[user-friendly-mechanical-design-dat]]

          +

          +- [[nut-t-dat]] - [[nut-thumb-dat]] - [[nut-dat]]

          +

          +![](2026-02-22-16-07-56.png)

          +

          +

          +

          +## ref 

          +

				mechanics-dat/mechanical-parts-dat/screw-dat/screw-thumb-dat/2026-02-22-16-01-39.png
			
          Binary files /dev/null and b/mechanics-dat/mechanical-parts-dat/screw-dat/screw-thumb-dat/2026-02-22-16-01-39.png differ

				mechanics-dat/mechanical-parts-dat/screw-dat/screw-thumb-dat/screw-thumb-dat.md
			
          @@ -0,0 +1,42 @@

          +

          +# screw-thumb-dat

          +

          +

          +- [[screw-thumb-dat]] - [[nut-thumb-dat]] - [[product-dat]] - [[user-friendly-mechanical-design-dat]]

          +

          +

          +- [[screw-dat]] - [[nut-dat]]

          +

          +- [[nut-wing-dat]] - [[screw-wing-dat]] 

          +

          +

          +## screw thumb types 

          +

          +- wing-screw / wing-nut 

          +

          +### Knurled Head Thumbscrews: * Features a textured (diamond or straight) pattern on the side of a cylindrical head.

          +

          +Best for: Precise, low-torque adjustments in electronics or robotics.

          +

          +### Wing Screws (Butterfly Screws):

          +

          +Has two flat "wings" protruding from the head.

          +

          +Best for: Providing maximum leverage for hand-tightening without tools.

          +

          +![](2026-02-22-16-01-39.png)

          +

          +

          +### Spade Head Thumbscrews:

          +

          +The head is a thin, flat "spade" (like a key).

          +

          +Best for: Situations where you need to apply torque with your whole hand rather than just fingertips.

          +

          +### T-Handle / Tee-Head Screws:

          +

          +Shaped like a 'T'.

          +

          +Best for: Large machinery or heavy-duty outdoor gear where you might be wearing gloves.

          +

          +

				mechanics-dat/mechanics-dat.md
			
          @@ -72,7 +72,7 @@ mechanics-dat

           [[Pneumatic-cylinder-dat]]

          -[[Lead-screw-dat]] - [[screw-dat]]

          +[[Lead-screw-dat]] - [[screw-dat]] - [[screw-thumb-dat]]

           - [[flange-dat]]

				product-dat/product-dat.md
			
          @@ -2,6 +2,8 @@

           # product-dat

          +- [[product-dat]] - [[fab-product-dat]] - [[assembly-dat]]

          +

           - [[PCB-dat]] 

           - [[mechanics-dat]] 

          @@ -12,7 +14,11 @@

           - [[cad-dat]]

          -- [[user-friendly-mechanical-design-dat]]

          +- [[screw-thumb-dat]] - [[nut-thumb-dat]] - [[product-dat]] - [[user-friendly-mechanical-design-dat]]

          +

          +

          +

          +

           ## ref

				product-dat/user-friendly-dat/user-friendly-mechanical-design-dat/user-friendly-mechanical-design-dat.md
			
          @@ -6,5 +6,5 @@

           - Wing-Nut (羊角) / wing-screw

          -

          +- [[screw-thumb-dat]] - [[nut-thumb-dat]] - [[product-dat]] - [[user-friendly-mechanical-design-dat]]

...	...	@@ -72,7 +72,7 @@ mechanics-dat
72	72
73	73	[[Pneumatic-cylinder-dat]]
74	74
75		-[[Lead-screw-dat]] - [[screw-dat]]
	75	+[[Lead-screw-dat]] - [[screw-dat]] - [[screw-thumb-dat]]
76	76
77	77	- [[flange-dat]]
78	78

...	...	@@ -3,6 +3,12 @@
3	3
4	4	- [[lora-sdk-dat]]
5	5
	6	+[[USB-dat]] - [[encryption-key-dat]] - [[encryption-dat]]
	7	+
	8	+
	9	+RSA/ECC, DES/3DES, AES, SHA1/256/384/512
	10	+
	11	+
6	12	## AES encryption
7	13
8	14	![](2025-06-26-19-15-28.png)

...	...	@@ -0,0 +1,19 @@
	1	+
	2	+# encryption-key-dat
	3	+
	4	+
	5	+[[USB-dat]] - [[encryption-key-dat]] - [[encryption-dat]]
	6	+
	7	+
	8	+![](2026-02-22-16-12-42.png)
	9	+
	10	+- T2000
	11	+- SSX1108 - [[patent-dat]] == https://patents.google.com/patent/CN103246494A/zh == 一种抵抗能量分析和错误攻击的安全模幂计算方法
	12	+
	13	+https://www.aisinochip.com/index.php/product/show/id/24/catid/126.html
	14	+
	15	+智能安全芯片 == ACH512是一款基于安全算法的高性能SoC芯片，广泛应用于税务、大容量存储、高速USBKEY、物联网、生物识别市场。
	16	+
	17	+- [[aisinochip-dat]]
	18	+
	19	+

...	...	@@ -6,7 +6,7 @@
6	6
7	7	- [[robot-joint-dat]] == [[motor-gimbal-dat]] - [[encoder-dat]]
8	8
9		-
	9	+- [[robot]]
10	10
11	11	## types
12	12
...	...	@@ -15,8 +15,10 @@
15	15	- palm
16	16	- vision rover
17	17	- educational robot
18		-- Humanoid robot
19		-- robot dog
	18	+- [[robot-Humanoid-dat]]
	19	+- [[robot-dog-dat]]
	20	+
	21	+
20	22
21	23	## system
22	24

...	...	@@ -0,0 +1,36 @@
	1	+
	2	+# chemistry-dat
	3	+
	4	+## Nitric Acid (HNO₃)
	5	+
	6	+Nitric Acid is a powerful, highly corrosive mineral acid. In its pure form, it is colorless, but older samples often take on a yellow cast due to decomposition into oxides of nitrogen and water.
	7	+
	8	+---
	9	+
	10	+### 🧪 Industrial and Laboratory Applications
	11	+
	12	+Nitric acid is a fundamental chemical building block used across several major industries:
	13	+
	14	+#### 1. Agriculture (Fertilizers)
	15	+The largest share of nitric acid production goes toward creating Ammonium Nitrate ($NH_4NO_3$). This is a high-nitrogen compound essential for global crop production.
	16	+
	17	+#### 2. Explosives and Munitions
	18	+It is a primary reagent in the "nitration" process used to manufacture explosives, including:
	19	+* TNT (Trinitrotoluene)
	20	+* Nitroglycerin
	21	+* Gun cotton (Nitrocellulose)
	22	+
	23	+#### 3. Metallurgy and Etching
	24	+* Pickling: Used to remove oxidation and impurities from the surface of stainless steel and other alloys.
	25	+* Etching: Used in printmaking and jewelry to eat into the unprotected parts of a metal surface to create a design.
	26	+
	27	+
	28	+#### 4. Rocketry
	29	+Red Fuming Nitric Acid (RFNA) is used as an oxidizer in liquid-fuel rockets, particularly in tactical missiles and older space launch vehicles.
	30	+
	31	+![](2026-02-22-16-18-24.png)
	32	+
	33	+![](2026-02-22-16-18-34.png)
	34	+
	35	+## ref
	36	+

...	...	@@ -0,0 +1,6 @@
	1	+
	2	+# fab-laser-cutting-dat
	3	+
	4	+laser cut
	5	+
	6	+![](2026-02-22-16-05-10.png)
...	...	\ No newline at end of file

...	...	@@ -1,6 +1,8 @@
1	1
2	2	# Nut-dat
3	3
	4	+- [[nut-t-dat]] - [[nut-thumb-dat]] - [[nut-dat]]
	5	+
4	6	- 螺母
5	7
6	8

...	...	@@ -0,0 +1,15 @@
	1	+
	2	+
	3	+# nut-thumb-dat
	4	+
	5	+
	6	+- [[screw-thumb-dat]] - [[nut-thumb-dat]] - [[product-dat]] - [[user-friendly-mechanical-design-dat]]
	7	+
	8	+- [[nut-t-dat]] - [[nut-thumb-dat]] - [[nut-dat]]
	9	+
	10	+![](2026-02-22-16-07-56.png)
	11	+
	12	+
	13	+
	14	+## ref
	15	+

...	...	@@ -0,0 +1,42 @@
	1	+
	2	+# screw-thumb-dat
	3	+
	4	+
	5	+- [[screw-thumb-dat]] - [[nut-thumb-dat]] - [[product-dat]] - [[user-friendly-mechanical-design-dat]]
	6	+
	7	+
	8	+- [[screw-dat]] - [[nut-dat]]
	9	+
	10	+- [[nut-wing-dat]] - [[screw-wing-dat]]
	11	+
	12	+
	13	+## screw thumb types
	14	+
	15	+- wing-screw / wing-nut
	16	+
	17	+### Knurled Head Thumbscrews: * Features a textured (diamond or straight) pattern on the side of a cylindrical head.
	18	+
	19	+Best for: Precise, low-torque adjustments in electronics or robotics.
	20	+
	21	+### Wing Screws (Butterfly Screws):
	22	+
	23	+Has two flat "wings" protruding from the head.
	24	+
	25	+Best for: Providing maximum leverage for hand-tightening without tools.
	26	+
	27	+![](2026-02-22-16-01-39.png)
	28	+
	29	+
	30	+### Spade Head Thumbscrews:
	31	+
	32	+The head is a thin, flat "spade" (like a key).
	33	+
	34	+Best for: Situations where you need to apply torque with your whole hand rather than just fingertips.
	35	+
	36	+### T-Handle / Tee-Head Screws:
	37	+
	38	+Shaped like a 'T'.
	39	+
	40	+Best for: Large machinery or heavy-duty outdoor gear where you might be wearing gloves.
	41	+
	42	+

...	...	@@ -2,6 +2,8 @@
2	2	# product-dat
3	3
4	4
	5	+- [[product-dat]] - [[fab-product-dat]] - [[assembly-dat]]
	6	+
5	7	- [[PCB-dat]]
6	8
7	9	- [[mechanics-dat]]
...	...	@@ -12,7 +14,11 @@
12	14
13	15	- [[cad-dat]]
14	16
15		-- [[user-friendly-mechanical-design-dat]]
	17	+- [[screw-thumb-dat]] - [[nut-thumb-dat]] - [[product-dat]] - [[user-friendly-mechanical-design-dat]]
	18	+
	19	+
	20	+
	21	+
16	22
17	23
18	24	## ref

...	...	@@ -6,5 +6,5 @@
6	6	- Wing-Nut (羊角) / wing-screw
7	7
8	8
9		-
	9	+- [[screw-thumb-dat]] - [[nut-thumb-dat]] - [[product-dat]] - [[user-friendly-mechanical-design-dat]]
10	10