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Aktiwiteit 2:

Om maniere te ondersoek wat die uitputting van hout as hulpbron sal verminder

[lu 3.3]

1. Stel ‘n alternatiewe materiaal voor waaruit elk van die volgende produkte vervaardig kan word:

  • Kurkproppe (boombas)
  • Rayonmateriaal
  • Houtplanke vir die maak van meubels
  • Houtsaagsels
  • Papier
  • Dwarslêers (spoor)
  • Houtkissies (vrugte)
  • Potlode

2. Watter funksies wat deur bome (woude) as ‘n lewensonderhoudende stelsel verrig word, kan deur niks anders verrig word nie? (Sien par. 1)

Aktiwiteit 3:

Om die belangrikste woudstreke op ‘n kaart aan te dui

[lu 1,1]

  • Raadpleeg ‘n atlas om die belangrikste woudstreke in die RSA aan te dui.

Indringerspesies

  • Suid-Afrika se natuurlike omgewing is reeds deur meer as 100 spesies vreemde fauna en flora binnegedring. Dit het aanleiding gegee tot wydverspreide ekologiese skade en verliese van etlike miljarde rande ten opsigte van verlore landboupotensiaal en ander grondgebruike. Boonop is die uitroei van indringerspesies ‘n duur en tydrowende proses.
  • Die indringerplante wat die afgelope dekades die vinnigste versprei het en reeds honderde duisende hektaar ingeneem het, sluit in hakea , Australiese Acacias , die Mauritius-doring, paraffienbos, lantana, waterlelie, nasella-graspol, verskeie dennespesies en die litjieskaktus.
  • Vreemde visspesies soos forelle en babers het ook reeds sommige rivierstelsels se inheemse vis verdring, terwyl eksotiese voëlsoorte soos Europese spreeus en Indiese myna-voëls ‘n oorlas in stedelike en moontlik in landelike gebiede is. Hul presies getalle is egter nie bekend nie. Uitheemse rotte en muise is probleemdiere in menslike nedersettings, terwyl die Argentynse mier Suid-Afrika se fynbos bedreig deurdat hy die saadverspreidende inheemse mier verdring.
  • Suid-Afrika se kosbare waterbronne word ook swaar getref deur indringerplante. Oewerhabitats is veral kwesbaar vir indringing en die bo- en middellope van talle riviere is byna heeltemal toegegroei deur digte plate silwer en swart wattelbome ( Acacia -spesies).
  • In fynbosgebiede het digte plate indringerplante die waterbalans van bergopvanggebiede versteur en skep indringers ‘n baie groter brandgevaar as die natuurlike plantegroei.
  • Al sewe die belangrikste biosfere word deur indringerplante bedreig en fynbos, savanna en woudgebiede word die swaarste getref. Tot dusver is pogings om indringerplante in die subkontinent se formele bewaringsgebiede in bedwang te bring, met wisselende sukses toegespits op indringerbome en -struike. Indringing deur onkruid en grasse word meestal oor die hoof gesien en weinig ekologiese inligting is beskikbaar oor hierdie probleem.

Aktiwiteit 4:

Om navorsing oor indringerspesies te doen en daaroor te skryf

[lu 1.2]

Om indringerspesies uit te roei, is ‘n duur en tydrowende proses.

1. Skryf kort aantekeninge oor een indringerplant en een indringerdier wat in julle omgewing voorkom.

a) Indringerplant

b) Indringerdier

Enkele voorbeelde van indringerplante

Litjieskaktus

Besmetting deur litjieskaktus belemmer boerderybedrywighede en veroorsaak dat die waarde van besmette grond verminder.

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Aardrykskunde graad 8. OpenStax CNX. Sep 11, 2009 Download for free at http://cnx.org/content/col11035/1.1
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