0%

0912 Question

1. Difference between Beef/Chicken/Pork

Muscle structure

  • beef more muscle mass
  • chicken lighter and delicate muscle
  • pork in between

Myoglobin content: 肌红蛋白

  • giving meat its red color
  • highest in beef, then pork, chicken least

Fat content

  • beef more marbled fat content, make it juicer and rick flavor
  • pork has a distinct fat profile
  • chicken depend on the part

1.1. Chicken White?

Muscle that are used

  • regularly and for extended activities have more myoglobin
  • short bursts like flight, have less myoglobin

White meat: breast and wing

Dark meat: legs and thigh, still significant lighter than beef

2. How Stainless Steal Made and Works

Reason: minimum of 10.5% chromium, and other element like nickel, molybdenum, carbon and nitrogen

2.1. Chromium

The chromium in the steel reacts to oxygen to form a thin, invisible layer on the surface, extremely adherent and protective

Feature: self-healing

2.2. Limitation

Not entirely impervious. Not good in

  • low oxygen
  • high salinity

3. US Police System

3.1. Car

Police car: city police department use it, for patrolling city streets, conducting traffic stop

Sheriff car: county sheriff use it, role vary by state, in general enforce the law that not covered by city police

K9: any law enforcement agency employ K9 units, like city police, county sheriff, state police. Used for variety of task like searching drugs, explosives, missing persons.

  • Specially equipped to ensure the safety and comfort for the dog
  • The word come from canine, the Latin word for ‘dog’

3.2. Police System

Layered and decentralized law enforcement system

State police: patrol highway, rural areas

City police: enforce city ordinances

County sheriff: in addition to law enforcement, often run jail, security for county courthouse, serve legal documents

3.3. Sheriff

Shire: means district

Reeve: means guardian

Police: origin in Greek word “polis”, means city

3.4. 911? Which Layer?

The public safety answering point would choose different agency according to the location and emergency

4. Phase Detection?

PDAF:

  1. splitting incoming light into two images 2. Comparing two images
    1. if not aligned: out of focus
  2. By determine the direction and how much misaligned, the camera can quickly adjust the lens

Pro:

  • Faster to focus
  • Better for tracking

Con:

  • Require additional hardware
  • Need calibration

4.1. How it Works

Phase detection pixel has two microlense

  • lead to two slightly different perspective of subject

If in focus

  • two array would be the same

If not focus

  • subtracting one array from the other would result in non-zero values

5. Why Ear Wax

Evolutionary perspective

  • Protection: from dust, particles
  • Lubrication: without it, easier to get cut and infections
  • Waterproofing
  • Detering insects