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Biological Reactors: Material Balances and Kinetics

Classified in Geology

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TERZA PARTE

1. Fed-batch biological reactor: material balances with Monod kinetics and operating methods:

  • it maintains some operational characteristics of the batch, while ensuring constant biomass production such as a CSTR
  • Therefore, there is an inlet supply with V˙e and [substrate] Cse and negligible Cxe
  • since it is not a continuous reactor, it will never reach the steady state condition, there will always be an accumulation
  • at zero time there will be: a certain initial VR with an initial [substrate], initial [biomass] and subsequently the volume will increase over time.
  • Total biomass balance:
  • dmtot / dt = me, with me = ρe V ,e,
  • from this relationship we obtain that
    1. dVr / dt = V˙e.
  • At this point two feeding strategies can be considered,
    1. 1. one with
... Continue reading "Biological Reactors: Material Balances and Kinetics" »

Southern Europe: A Geographic and Cultural Overview

Classified in Geography

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Southern Europe

Geographic Features

Mountains and Peninsulas

  • Pyrenees Mountains: Form a natural border between Spain and France.
  • Undersea Mountains: Contribute to the formation of many islands in Southern Europe.
  • Alps: Europe's highest mountain range.
  • Apennines: Run along the Italian Peninsula.
  • Balkan Peninsula: Home to Greece.
  • Iberian Peninsula: Location of Spain and Portugal.

Water Bodies and Climate

  • Mediterranean Sea: Influences the climate and culture of Southern European countries.
  • Mediterranean Climate: Characterized by warm, dry summers and mild, wet winters, ideal for growing crops.
  • Tagus River: The longest river in Southern Europe.
  • Po River: Flows through a fertile and densely populated area in Italy.

Culture and History

Ancient Greece

  • Democracy:
... Continue reading "Southern Europe: A Geographic and Cultural Overview" »

Key Features of European Geography and History

Classified in History

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What landforms stretches from the Atlantic coast and Eastern Europe?

Northern European plain

The leading agricultural producer in the European Union is

France

Germany's economy is based on

Industry

What landform covers much of Switzerland and Austria

Mountains

West Central Europe's Marine West Coast climate is a key natural resource for

Farming

During World War II France and the Benelux countries were invaded by

Germany

The Benelux countries are all

densely populated

The Dutch have used dikes and other technology to

Create polders

A highly urbanized and industrialized area of the Netherlands is called

Rotterdam

What industry employs more than half of Austria's workforce?

Service

Belgium has been troubled by regional conflicts over

Language and other cultural issues

Switzerland

Does... Continue reading "Key Features of European Geography and History" »

Chemistry Basics: Metals, Nonmetals, and Transition Elements

Classified in Chemistry

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In the periodic table, elements are classified into metals, nonmetals, and metalloids. Metals are ductile, malleable, shiny, are good conductors for heat and electricity. All metals are solids at room temperature and pressure except, Mercury. Nonmetals exist as solids, liquids, or gases. A liquid non-metal at room temperature and pressure is Bromine.


  1. The elements in the d-block in the periodic table have several characteristics in common.

(i) Give the electron configuration of N2+

1S2 2S2 2P3- 2= 1S2 2S2 2P1


(ii) Explain what is meant by a ligand and describe the type of bond formed between a ligand and a d-block element.

It is an atom or molecule with a lone pair of electrons that combine with a metal through coordinate covalent bonding. In transition... Continue reading "Chemistry Basics: Metals, Nonmetals, and Transition Elements" »

Standard Balance Sheet and Income Statement Classification

Classified in Economy

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Non-Current Assets

  • Intangible Assets
    • Software
    • Patents
    • Accumulated amortization of intangible assets
  • Tangible Assets
    • Land and natural assets
    • Buildings
    • Technical facilities
    • Machinery
    • Equipment / tooling
    • Furniture
    • Computer technologies
    • Transport elements
    • Accumulated amortization of tangible assets
  • Real Estate Investments
    • Investments in land and natural assets
    • Building investments
    • Accumulated amortization of real estate investments
  • Long-Term Financial Investments
    • Long-term financial investments in equity instruments
  • Long-Term Loans
    • Long-term loans from sale of fixed assets

Current Assets

  • Inventories
    • Goods
    • Raw materials
    • Finished products
    • Other
  • Trade Receivables
    • Clients
    • Clients with bill of exchange receivable
    • Debtors
    • Debtors with bill of exchange receivable
    • Short-term financial
... Continue reading "Standard Balance Sheet and Income Statement Classification" »

My Journey to Multilingualism: Spanish, English, and Beyond

Classified in Teaching & Education

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My Personal Linguistic Journey

I have explored four different languages throughout my life, including: Spanish, English, French, and Italian. However, I am not equally proficient in all those languages.

Native Fluency and Literacy

Regarding my linguistic skills, I can claim native fluency and literacy only in Spanish, which is my mother tongue. However, I am not equally proficient in all those languages: I can speak two languages besides Spanish with reasonable fluency and have great degrees of proficiency in another one.

Educational Background and Language Acquisition

I started learning my mother tongue at home. At the age of five, I started elementary school with my first approach to English. After five years, when I was eleven, I went to secondary... Continue reading "My Journey to Multilingualism: Spanish, English, and Beyond" »

Understanding the Arbitrage Pricing Theory for Financial Asset Valuation

Classified in Economy

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The Model of Valuation of Financial Assets by the Arbitrage Pricing Theory

Stephen Ross developed this theory in 1976. It is an equilibrium model for asset valuation. Its central idea is the expected return on an asset must be a linear function of its systematic risk. The APT considers that the only risk that the market is willing to remunerate is the systematic one, since the rest of the risk can be eliminated via diversification. According to this model, the systematic risk is the fundamental explanatory factor of the performance of the profitability of financial assets, although that is not measured only by the beta coefficient of the profitability of an individual asset with respect to the profitability of the market portfolio, but by a... Continue reading "Understanding the Arbitrage Pricing Theory for Financial Asset Valuation" »

Markowitz Portfolio Theory Explained

Classified in Economy

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Markowitz Model Assumptions

Harry Markowitz was the first to investigate financial markets in this way. He developed the theory of portfolio selection based on the best conditions for the placement of capital in a situation of uncertainty.

Investor Motivation & Portfolio Goals

Markowitz focuses his work on defining the factors that motivate the investor when investing. It is based on the utility function of the investor that depends on the profitability he wants to obtain and the risk he can assume. What it intends is to compose an optimal portfolio of securities for an investor, this being the best possible among all those that can be formed. It will be a search for a portfolio where performance is maximized for a given risk or vice versa.... Continue reading "Markowitz Portfolio Theory Explained" »

Linguistic Concepts: Definitions and Examples

Classified in Language

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Linguistic Concepts

2. (1.5p) Define the following concepts as they have been used in this course, giving an example of each:

Meronymy

Meronymy is the semantic relation between a lexical item denoting a part and that denoting the corresponding whole. Meronyms are mentally triggered, since our minds have scripts, e.g., knowledge about event sequences due to knowledge of the world. We have scripts for events that commonly occur in our lives, such as going to a doctor's office, a restaurant, a library, or the supermarket.

Converses

Converses are pairs of opposite terms characterized by the following feature: when one member of the pair is substituted for the other, the new sentence can be made logically equivalent to the original one by interchanging... Continue reading "Linguistic Concepts: Definitions and Examples" »

Linguistic Concepts: Range, Metaphor, and Tense Usage

Classified in Electronics

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Range: Definition and Examples

Range is a non-prototypical participant: the nominal concept implied by the process as its scope or range. Examples include song in "sing a song," games in "play games," and race in "run a race." Some, such as "live a happy life" or "die a martyr’s death," are derived from a related verb; others, such as games in "play games," are not.

Perhaps the most common type of range element today are the deverbal nominals which complement lexically ‘light’ verbs such as have and give.

Grammatical Metaphor: Definition and Examples

Any state can be conceptualized and expressed in more than one way. A more nominalised version encodes actions and states as nouns, which involves a complete restructuring of the clause. This... Continue reading "Linguistic Concepts: Range, Metaphor, and Tense Usage" »