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Near the end of the century Bulgaria again broke free from Byzantine rule and then Serbia was able to separate from Bulgaria to found the poverty ridden Serb Kingdom (1180).

Italy

The north half of Italy remained subject to the German Empire, but the Papal States had some semblance of self-government and Lombardy and Florence retained some local control. Venice continued to be independent while southern Italy and Sicily prospered under the excellent administration of the Normans. The people of the Two Sicilies had a free choice of religion under Roger I Guiscard and then Roger II after 1101. The latter even started a silk industry at Palmermo, bringing silk workers from Greece, after his expeditions there. Frederick Barbarossa entered Rome on his 4th expedition into Italy, in 1167, and enthroned an anti-pope Paschal III, but a pestilence broke out among his troops and he soon withdrew. The end of the predominance of knighthood was foreshadowed when an army of German knights met defeat to charging pikemen of the Lombard League of cities of northern Italy at Legnano in 1176. The League's subsequent military might was completely defensive with town walls and the massed pikemen infantry. (Ref. 279) At the end of the century the German Emperor Henry VI, with the help of Genoa and Pisa, which was then at the height of its power, wrested southern Italy away from Norman control. Genoa may have minted its own gold coins late in this century and other Italian cities soon followed. (Ref. 222, 260) Additional Notes

In the Italian Alps through Lombardy and Piedmont (as well as in Carinthia and Styria of Austria) the Carthusian monks were dominant in the development of pre-modern iron smelting through the use of strong drafts produced by the enormous water power of alpine streams. Then came a method of refining cast iron, by charcoal fire and the addition of scrap iron to produce steel (Ref. 260). In spite of political changes, the medical school at Salerno continued to function on a high level. Even epilepsy and psychoses were given somatic causes and treatment, although their organic bases were still denied by the followers of Galen. Salerno was a cross-roads of European, Arabic and Jewish medicine. Gerard, an Italian scholar of Cremona, went to Toledo, Spain to learn Arabic and by the time of his death in 1187 he had translated 71 Arabic works, most of them medical, including Avicenna's Canon and the works of Rhazes.

Central europe

In general Europe experienced another warm period during this century, as in the last one. (Ref. 224)

Germany

North German cities soon dominated the Baltic trade and new cities were formed father and farther eastward by the pseudo-crusades of the Knights of the Sword and the Teutonic Knights. (Ref . 137). Cultural advances speeded up civilization in the German realms. The first paper mill in Europe opened at Ravensburg. These areas also saw the mining of copper, silver, gold and iron. There were continued emperor - pope struggles with a temporary peace following the Concordant of Worms of 1122 when it was agreed that there would be a divided ceremony of investiture - one spiritual and one lay, thus assuring the concurrence of both pope and emperor in the choice of bishops.

Questions & Answers

find the 15th term of the geometric sequince whose first is 18 and last term of 387
Jerwin Reply
The given of f(x=x-2. then what is the value of this f(3) 5f(x+1)
virgelyn Reply
hmm well what is the answer
Abhi
how do they get the third part x = (32)5/4
kinnecy Reply
can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
ninjadapaul
20/(×-6^2)
Salomon
okay, so you have 6 raised to the power of 2. what is that part of your answer
ninjadapaul
I don't understand what the A with approx sign and the boxed x mean
ninjadapaul
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
Salomon
I'm not sure why it wrote it the other way
Salomon
I got X =-6
Salomon
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
ninjadapaul
oops. ignore that.
ninjadapaul
so you not have an equal sign anywhere in the original equation?
ninjadapaul
hmm
Abhi
is it a question of log
Abhi
🤔.
Abhi
Commplementary angles
Idrissa Reply
hello
Sherica
im all ears I need to learn
Sherica
right! what he said ⤴⤴⤴
Tamia
hii
Uday
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
Kim
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Al
y=10×
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
how do you translate this in Algebraic Expressions
linda Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele 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, A comprehensive outline of world history. OpenStax CNX. Nov 30, 2009 Download for free at http://cnx.org/content/col10595/1.3
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