vault backup: 2024-10-22 13:26:47

.obsidian/core-plugins.json

@@ -1,18 +1,31 @@
-[
+{
-  "file-explorer",
+  "file-explorer": true,
-  "global-search",
+  "global-search": true,
-  "switcher",
+  "switcher": true,
-  "graph",
+  "graph": true,
-  "backlink",
+  "backlink": true,
-  "canvas",
+  "outgoing-link": false,
-  "tag-pane",
+  "tag-pane": true,
-  "properties",
+  "page-preview": true,
-  "page-preview",
+  "daily-notes": false,
-  "note-composer",
+  "templates": false,
-  "command-palette",
+  "note-composer": true,
-  "editor-status",
+  "command-palette": true,
-  "bookmarks",
+  "slash-command": false,
-  "markdown-importer",
+  "editor-status": true,
-  "word-count",
+  "starred": false,
-  "file-recovery"
+  "markdown-importer": true,
-]
+  "zk-prefixer": false,
+  "random-note": false,
+  "outline": false,
+  "word-count": true,
+  "slides": false,
+  "audio-recorder": false,
+  "workspaces": false,
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+  "canvas": true,
+  "bookmarks": true,
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+}

education/math/MATH1060 (trig)/Addition and Subtraction.md

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+Given the formula $\sin(\alpha + \beta)$:
+$$ \sin(\alpha + \beta) = \sin(\alpha)\cos(\beta) + \cos(\alpha)\sin(\beta) $$
+Given the formula $\cos(\alpha + \beta)$:
+$$ \cos(\alpha + \beta) = \cos(\alpha)\cos(\beta) - \sin(\alpha)\sin(\beta) $$

education/math/MATH1060 (trig)/Identities.md

@@ -1,3 +1,4 @@
+An **identity** is an equation that is true for all values of the variable for which the expressions in the equation are defined.
 # Trigonometric Identities
 
 All of the following only apply when the denominator is not equal to zero.
@@ -64,3 +65,15 @@ Getting rid of the exponent:
 $$ \sqrt{\frac{576}{625}} = \frac{24}{25} = sin\theta $$
 
 From there, you can find the rest of the identities fairly easily.
+
+# Simplifying trig expressions using identities
+Given the difference of square formula:
+$$ a^2 - b^2 = (a-b)(a+b) $$
+
+## Examples
+Simplify $\tan\theta\sin\theta + \cos\theta$:
+1. $\dfrac{\sin\theta}{\cos\theta} * \sin\theta + \cos\theta$
+2. $\dfrac{\sin^2\theta}{cos\theta} + \cos\theta$
+3. $(\dfrac{\sin^2\theta}{cos\theta} + \cos\theta)\dfrac{\cos\theta}{\cos\theta} = \sin^2\theta*\cos^2\theta + \cos\theta$ 
+
+Si\

education/nutrition/Energy Balance & Weight Management.md

@@ -0,0 +1,109 @@
+- An overweight person has extra weight from bones, fat, muscle, body fat, and/or body wader
+- Obesity is a condition characterized by excessive and unhealthy bodyfat
+
+# Consequences
+## Obesity
+- Type II Diabetes (DM)
+- **Hypertension**
+- Cardiovascular disease
+- **Obstructive sleep apnea**
+- Osteoarthritis
+- Infertility
+- Certain cancers
+- Gallbladder disease
+- Respiratory problems
+- Surgical complications
+- Clinical depression
+- Metabolic syndrome
+- **Stroke**
+
+# Underweight
+- Fatigue / Anemia
+- Nutrient deficiencies
+- Lack of energy
+- Poor concentration
+- Unhealthy hair, skin, nails
+- Osteoporosis
+- Illness/infection
+- Bone fractures
+- Amenorrhea
+- Infertility
+- High risk pregnancy
+- Clinical depression
+- Low body temperature
+
+# BMI
+- A numerical value based on the ratio between a person's height and weight that is used to **classify a person's weight** and **measure risk for disease**
+- Can be calculated using:
+$$ \dfrac{Weight (kg)}{Height (m)^2} or \dfrac{Weight (lbs)}{Height (in)^2} * 703 $$
+Conversions:
+- Lbs -> Kg: Divide by 2.2
+- Feet -> Inches: Multiply by 12
+- Inches -> Meters: Multiply by 2.54 / 100
+
+## Ranges
+- Underweight: BMI < 18.5
+- Healthy weight: BMI 18.5 - 24.9
+- Overweight: BMI 25.0 - 29.9
+- Obese: BMI >= Obses
+	- Obese Class I: BMI 30-34.9
+	- Obese Class II: BMI 35-39.9
+	- Obese Class III: BMI >=40
+
+## Limitations
+Not always accurate for:
+- Highly muscular individuals
+- Older adults
+- Chronically ill individuals
+- BMI does not take gender, age, race, or activity level into account
+
+## NWO
+- Normal weight obesity refers to a normal body weight as measured by BMI, but they actually have higher body fat
+- Comes with an associated risk of insulin resistance
+- Diabetes
+- Coronary artery disease
+
+# Body Composition and Fat Distribution
+- Body composition is the relative and absolute measurement of body tissues, usually expressed as a percent body fat
+- Adipose tissue refers to fat cells
+- Total body fat refers to to adipose tissue and essential fat
+- Essential fat is fat that is vital for survival; found in cell membranes, certain bones, and nervous tissue.
+- **Subcutaneous** is fat accumulation of adipose tissue cells in the tissue under the skin.
+	- This layer helps to:
+		- *Insulate the body against cold temps*
+		- *Protect the body from bumps and bruises*
+- **Visceral fat** is the accumulation of adipose cells under the abdominal muscles and over the digestive organs to protect them
+
+- Types of obesity
+	- **Apple shaped (Central body)**: Central body obesity: Risk of heart diseases, stroke, diabetes, HTN, cancer
+	- **Gynoid (Pear shaped)**: Not associated w/ Chronic Disease Risk
+
+## Assessment
+- Hydrostatic weight (error of 2-3%)
+- Air displacement plethysmography- BODPOD (error of 3-5%)
+- Dual energy x-ray absorptiometry: DEXA (Error of 1-4%)
+- **Bio-electrical impedance** (Error: 3-4%) Sends a shock through your body and measures how long it takes
+- Skinfold calipers (Error 3-5%)
+- **Waist circumference -> 35 inches for a women** or **>40 inches for a man** is associated with central adiposity and increased health risk, specifically CVD risk
+
+## Health
+- Losing as little as 5% of excess body fat
+	- Can increase HDL cholesterol levels
+	- Reduce high blood pressure
+	- Improve glucose tolerance
+
+# Energy Exchange
+## Energy In
+- Carbs
+- Lipids
+- Proteins
+- Alcohol
+
+## Energy Out (Total Energy Expenditure )
+- Basal metabolic rate
+	- The minimum number of kcals required to maintain normal body function after fasting and resting for 12 hours. **Accounts for ~60-75% of an individual's total energy use**
+	- Factors that increase BMR include thyroid hormone levels and postexercise recovery
+	- Factors that decrease BMR include starvation and aging.
+- Physical activity
+- Thermic effect of food
+- Non-exercise activity

education/software development/ECE1400/C.md

@@ -48,6 +48,10 @@ int arr_size = sizeof(arr) / sizeof(arr[0]);
 
 ```
 
+# Pointers
+`&` gives you the address of a variable
+`*` gives you the value in memory that an address points to.
+
 
 # Formatting specifiers
 # Standard library

notes/Stronger 3d printing.md

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+- https://www.ankermake.com/blogs/guides/how-to-make-3d-prints-stronger
+- https://blog.prusa3d.com/how-to-improve-your-3d-prints-with-annealing_31088/
+- https://markforged.com/resources/blog/joinery-onyx
+- https://bigrep.com/posts/gyroid-infill-3d-printing/
+- https://www.hp.com/us-en/printers/3d-printers/learning-center/3d-printed-joint-design.html
+
+TL;dr:
+- Use gyroid infill with an infill density of between 50-80% for structural prints
+- Use PLA with a very slow speed, low layer height, and minimal/no cooling
+- Use dovetail joints of scale defined in the HP article
+- Anneal the print at 110c for ~30 minutes depending on the size and shape of the object