Edited, memorised or added to reading queue

on 12-Feb-2024 (Mon)

Do you want BuboFlash to help you learning these things? Click here to log in or create user.

Flashcard 7612819442956

Question
(1960s) Work by [...] , Merrill and Roberts on packet-switching theory pioneers the way to the world’s first wide-area computer network.
Answer
Kleinrock

statusnot learnedmeasured difficulty37% [default]last interval [days]               
repetition number in this series0memorised on               scheduled repetition               
scheduled repetition interval               last repetition or drill

Parent (intermediate) annotation

Open it
C.R. Licklider comes up with the idea for a global computer network. He later shares his idea with colleagues at the U.S. Department of Defense Advanced Research Projects Agency (ARPA). Work by <span>Leonard Kleinrock, Thomas Merrill and Lawrence G. Roberts on packet-switching theory pioneers the way to the world’s first wide-area computer network. Roberts later goes on to publish a plan for the ARPANET, an ARPA-funded computer network tha

Original toplevel document (pdf)

cannot see any pdfs






Flashcard 7612824161548

Question
Who developed the plan for the ARPANET?
Answer
Roberts

statusnot learnedmeasured difficulty37% [default]last interval [days]               
repetition number in this series0memorised on               scheduled repetition               
scheduled repetition interval               last repetition or drill

Parent (intermediate) annotation

Open it
d Research Projects Agency (ARPA). Work by Leonard Kleinrock, Thomas Merrill and Lawrence G. Roberts on packet-switching theory pioneers the way to the world’s first wide-area computer network. <span>Roberts later goes on to publish a plan for the ARPANET, an ARPA-funded computer network that becomes a reality in 1969. Over the following years, the ARPANET grows. <span>

Original toplevel document (pdf)

cannot see any pdfs






Flashcard 7616433360140

Question
(1960s) Work by Kleinrock, Merrill and [...] on packet-switching theory pioneers the way to the world’s first wide-area computer network.
Answer
Roberts

statusnot learnedmeasured difficulty37% [default]last interval [days]               
repetition number in this series0memorised on               scheduled repetition               
scheduled repetition interval               last repetition or drill

Parent (intermediate) annotation

Open it
C.R. Licklider comes up with the idea for a global computer network. He later shares his idea with colleagues at the U.S. Department of Defense Advanced Research Projects Agency (ARPA). Work by <span>Leonard Kleinrock, Thomas Merrill and Lawrence G. Roberts on packet-switching theory pioneers the way to the world’s first wide-area computer network. Roberts later goes on to publish a plan for the ARPANET, an ARPA-funded computer network tha

Original toplevel document (pdf)

cannot see any pdfs






Flashcard 7616433884428

Question
(1960s) Work by Kleinrock, [...] and Roberts on packet-switching theory pioneers the way to the world’s first wide-area computer network.
Answer
Merrill

statusnot learnedmeasured difficulty37% [default]last interval [days]               
repetition number in this series0memorised on               scheduled repetition               
scheduled repetition interval               last repetition or drill

Parent (intermediate) annotation

Open it
C.R. Licklider comes up with the idea for a global computer network. He later shares his idea with colleagues at the U.S. Department of Defense Advanced Research Projects Agency (ARPA). Work by <span>Leonard Kleinrock, Thomas Merrill and Lawrence G. Roberts on packet-switching theory pioneers the way to the world’s first wide-area computer network. Roberts later goes on to publish a plan for the ARPANET, an ARPA-funded computer network tha

Original toplevel document (pdf)

cannot see any pdfs






Annotation 7616447253772

A boundary is a limit that promotes integrity.
statusnot read reprioritisations
last reprioritisation on suggested re-reading day
started reading on finished reading on

pdf

cannot see any pdfs



Annotation 7616448826636

When you violate your own bound- aries or let another violate them, stuffing spills out of your life.
statusnot read reprioritisations
last reprioritisation on suggested re-reading day
started reading on finished reading on

pdf

cannot see any pdfs



Annotation 7616450399500

A boundary is like a membrane that keeps an organism in- tact. It lets positive things through. It keeps harmful things out. In this way it operates quite differently from a defense, which indiscriminately keeps things out.
statusnot read reprioritisations
last reprioritisation on suggested re-reading day
started reading on finished reading on

pdf

cannot see any pdfs



Annotation 7616451972364

Look at the parts of your life that work, that have integrity. This wholeness comes from the limits you have set to protect them. Any part of your life that is not working can be improved by boundaries.
statusnot read reprioritisations
last reprioritisation on suggested re-reading day
started reading on finished reading on

pdf

cannot see any pdfs



Annotation 7616460098828

Making liberal use of views is a key aspect of good SQL database design. Views allow you to en- capsulate the details of the structure of your tables, which might change as your application evolves, behind consistent interfaces.
statusnot read reprioritisations
last reprioritisation on suggested re-reading day
started reading on finished reading on

pdf

cannot see any pdfs



Annotation 7616461671692

Building views upon other views is not uncommon.
statusnot read reprioritisations
last reprioritisation on suggested re-reading day
started reading on finished reading on

pdf

cannot see any pdfs



Annotation 7616463244556

You want to make sure that no one can insert rows in the weather table that do not have a matching entry in the cities table. This is called maintaining the referential integrity of your data.
statusnot read reprioritisations
last reprioritisation on suggested re-reading day
started reading on finished reading on

pdf

cannot see any pdfs



Annotation 7616464817420

A transaction is said to be atomic: from the point of view of other transactions, it either happens completely or not at all.
statusnot read reprioritisations
last reprioritisation on suggested re-reading day
started reading on finished reading on

pdf

cannot see any pdfs



Annotation 7616466390284

We also want a guarantee that once a transaction is completed and acknowledged by the database system, it has indeed been permanently recorded and won't be lost even if a crash ensues shortly thereafter.
statusnot read reprioritisations
last reprioritisation on suggested re-reading day
started reading on finished reading on

pdf

cannot see any pdfs



Annotation 7616472681740

DateTime . now ( )
statusnot read reprioritisations
last reprioritisation on suggested re-reading day
started reading on finished reading on

luxon - Immutable date wrapper
es and offsets Calendars Formatting Parsing Math Validity API docs Support matrix For Moment users Why does Luxon exist? Luxon Luxon is a library for dealing with dates and times in JavaScript. <span>DateTime.now().setZone('America/New_York').minus({weeks:1}).endOf('day').toISO(); Features A nice API for working with datetimes Interval support (from time x to time y) Duration support (14 days, 5 m



Annotation 7616474778892

dt . minus ( { days : 7 } ) ;
statusnot read reprioritisations
last reprioritisation on suggested re-reading day
started reading on finished reading on

luxon - Immutable date wrapper
new instance with different properties". Math This is easier to show than to tell. All of these calls return new DateTime instances: var dt = DateTime.now(); dt.plus({ hours: 3, minutes: 2 }); <span>dt.minus({ days: 7 }); dt.startOf('day'); dt.endOf('hour'); Set You can create new instances by overriding specific properties: var dt = DateTime.now(); dt.set({hour: 3}).hour //=> 3 Intl Luxon provides se



Annotation 7616981503244

Зачастую количество различных значений в столбце невелико по сравнению с числом строк (например, у розничного торговца могут быть миллиарды торговых операций, но только 10 000 различных товаров). Мы можем теперь превратить столбец, содержащий n различных значений, в n отдельных битовых карт: по одной карте для каждого значения, по одному биту для каждой строки. Бит равен 1, если в строке содержится это значение, 0 — если нет.
statusnot read reprioritisations
last reprioritisation on suggested re-reading day
started reading on finished reading on

pdf

cannot see any pdfs



Annotation 7616986746124

#has-images

Vermaschtes Netz

  • Jeder der Teilnehmer ist mit mehreren oder allen Teilnehmern (vollvermascht) über direkte Leitung verbunden
  • Vorteile:
    • Hohe Leistungsfähigkeit
    • Hohe Ausfallsicherheit
    • Bei vollvermaschten Netzen kein Routing erforderlich
  • Nachteile:
    • Routing und Gleichverteilung der Netzlast sind bei nicht vollvermaschten Netzen komplex
    • Hohe Anzahl von Verbindungen; bei vollvermaschten Netzen quadratisch zur Knotenanzahl
statusnot read reprioritisations
last reprioritisation on suggested re-reading day
started reading on finished reading on

pdf

cannot see any pdfs



Annotation 7616991202572

#has-images

Definition: Eine Verbindung ist eine Beziehung zwischen zwei kommunizierenden Stationen über einen bestimmten Zeitraum.
statusnot read reprioritisations
last reprioritisation on suggested re-reading day
started reading on finished reading on

pdf

cannot see any pdfs



Annotation 7616995134732

Vermittlungsarten

  • Punkt-zu-Punkt-Verbindung ohne Vermittlung:
    • Je zwei Rechner permanent miteinander verbunden
    • + Kommunikation einfach
    • - Verkabelungsaufwand wächst quadratisch in der Rechneranzahl
  • Leitungsvermittlung (Switching Network):
    • Schaltung einer festen Verbindung durch Vermittlungsstellen
    • Beispiel: analoges Telefonnetz
    • + Teilnehmer erhalten feste Bandbreite zur alleinigen Nutzung
    • + Kommunikation einfach
    • - Ungenutzte Übertragungskapazitäten
    • - Aufbau von Verbindungen ist zeitintensiv
    • - Ausfall von Vermittlungsstellen legt Teile des Netzes lahm
statusnot read reprioritisations
last reprioritisation on suggested re-reading day
started reading on finished reading on

pdf

cannot see any pdfs



Annotation 7617005620492

#Pathology
NPCC is caused by inherited mutations in mismatch repair genes that encode proteins responsible for the detection, excision, and repair of errors that occur during DNA replication
statusnot read reprioritisations
last reprioritisation on suggested re-reading day
started reading on finished reading on

pdf

cannot see any pdfs



Annotation 7617009552652

enum Direction { Up = "UP" , Down = "DOWN" , Left = "LEFT" , Right = "RIGHT" , }
statusnot read reprioritisations
last reprioritisation on suggested re-reading day
started reading on finished reading on

Unknown title
concept, but have some subtle runtime differences as documented below. In a string enum, each member has to be constant-initialized with a string literal, or with another string enum member. ts <span>enum Direction { Up = "UP", Down = "DOWN", Left = "LEFT", Right = "RIGHT", } Try While string enums don’t have auto-incrementing behavior, string enums have the benefit that they “serialize” well. In other words, if you were debugging and had to read the runtime



Flashcard 7617023184140

Tags
#has-images
Question
太阳能电池的短路电流和断路电压的意义：[...]


Answer
研究太阳能电池短路状态和断路状态的原因在于，在确认了太阳能电池的伏安特性曲线的形状后，具体的太阳能电池伏安特性可以通过其伏安特性曲线与坐标轴的交点确定，而短路电流就是伏安特性曲线与Current轴的交点，断路电压就是伏安特性曲线与Voltage轴的交点。确定这两个点就可以确定太阳能电池的伏安特性

statusnot learnedmeasured difficulty37% [default]last interval [days]               
repetition number in this series0memorised on               scheduled repetition               
scheduled repetition interval               last repetition or drill





Flashcard 7617027116300

Tags
#has-images
Question
有光照时，太阳能电池的伏安特性：[...]


Answer
\(I=I_{L}-I_{0}\left(e^\frac{qV}{nkT}-1\right)\)

statusnot learnedmeasured difficulty37% [default]last interval [days]               
repetition number in this series0memorised on               scheduled repetition               
scheduled repetition interval               last repetition or drill





Flashcard 7617031048460

Question
太阳能电池短路电流：[...]
Answer
在太阳能电池短路的情况下的电流（\(V = 0\)）：\(I_{SC}=-I_{L}\)

statusnot learnedmeasured difficulty37% [default]last interval [days]               
repetition number in this series0memorised on               scheduled repetition               
scheduled repetition interval               last repetition or drill





Flashcard 7617032883468

Question
太阳能电池断路电压：[...]
Answer

在太阳能电池断路的情况下的电压（\(I = 0\)）：\(V_{OC}=\frac{nkT}{q}\ln\left(\frac{I_{L}}{I_{0}}+1\right)\)


statusnot learnedmeasured difficulty37% [default]last interval [days]               
repetition number in this series0memorised on               scheduled repetition               
scheduled repetition interval               last repetition or drill





Flashcard 7617034718476

Tags
#has-images
Question
太阳能电池的最大功率、填充系数、以及能量转化效率：[...]


Answer
  • 最大功率（Maximum Power）：\(P_{max}=I_{mp}V_{mp}\)
  • 填充系数（Fill Factor）：\(FF=\frac{I_{mp}V_{mp}}{I_{SC}V_{OC}}\)
  • 能量转化效率（Power Conversion Efficiency）：\(\eta=\frac{P_{max}}{P_{in}}=\frac{V_{mp}I_{mp}}{P_{in}}=\frac{FF\cdot V_{OC}I_{SC}}{P_{in}}\)

statusnot learnedmeasured difficulty37% [default]last interval [days]               
repetition number in this series0memorised on               scheduled repetition               
scheduled repetition interval               last repetition or drill