Notes, abstracts, papers, exams and problems

pure substance: is a phase of uniform composition and unchanging can not be decomposed into other substances of different classes by physical methods.

elements: they are pure substances that can not be decomposed into simpler ones through normal chemical processes.

compounds: they are pure substances made up of two or more elements, which can be decomposed by chemical methods on the elements of which are constituted. A compound always has the same elements and the same proportions regardless of the process followed.

Blended is an aggregation of different substances without causing any chemical reaction between them and therefore may be separated by physical methods.

ponderal laws: they refer to the quantity of matter of different substances... Continue reading "Laws ponderal" »

To sort the diversity of life using a rating system. Kingdom, phylum. sub class, super, order, sub groups, sub, genus, species, sub. Hierarchical binomial nomenclature, the greater the taxa categories. To reconstruct the phylogeny of a group uses a character that varies among members (ancestral character.) Is also used to compare outgroup (outgroup ) This is phylogenetically close, but not part of the study group. For any phylogenetic reconstruction we need to consider the characters that we use in our analysis and determine which is the primitive condition that presents the common ancestor of several. In this sense, we use the apomorphies that
refer to a derived or specialized character. In contrast, plesiomorphic, is a primitive character.

BPSK Signal Generation

This section demonstrates the generation of a Binary Phase Shift Keying (BPSK) signal using Python.

import numpy as np
import matplotlib.pyplot as plt

def bpsk_detect(modulated_signal, carrier):
    return np.sign(modulated_signal * carrier)

message_frequency = 10
carrier_frequency = 20
sampling_frequency = 30 * carrier_frequency
t = np.arange(0, 4/carrier_frequency, 1/sampling_frequency)
message = np.sign(np.cos(2 * np.pi * message_frequency * t) + np.random.normal(scale = 0.01, size = len(t)))
carrier = np.cos(2 * np.pi * sampling_frequency/carrier_frequency * t)
modulated_signal = carrier * message
detected_message = bpsk_detect(modulated_signal, carrier)

plt.figure(figsize=(12, 8))
plt.subplot(4, 1, 1)
plt.plot(t,

Church of La Vera Cruz, Segovia (12th Century)

• Centralized scheme floorplan
• Based on Dome of the Rock & Holy Sepulchre
• Central edicule
• Three apses head
• Quadrilateral bell tower
• Twelve-sided plan
• Two floors
• Buttresses
• Ribbed vault & Caliphal dome

Holy Sepulchre, Torres del Rio, Navarra (12th Century)

• C Templarios
• Octagonal plan
• Tower to get to the lantern
• Mudejar precedents
• Arabic star-shaped dome
• Apse in East
• Archivolts
• Parallel ribs
• Stone dome
• Pointed/midpoint arches

Templarios de Eunate Church, Navarra (12th Century)

• External cloister enclosing the Church
• East apse
• Tower with spiral stairs
• Ribs in dome pass through center
• Octagonal plan
• Dome starts in columns
• Midpoint arch

Cathedrals of St. James (11th Century)

• Central nave with barrel vaults
• Arches and transversal

Conditionals

Zero Conditional

If + present simple, ... present simple

First Conditional

If + present simple, ... will + infinitive

Second Conditional

If + past simple, ... would + infinitive

Third Conditional

If + past perfect, ... would + have + past participle

The Passive Voice (Active/Passive)

Present Simple

Active: The waiter serves the customers.

Passive: The customers are served by the waiter.

Present Continuous

Active: The waiter is serving the customers.

Passive: The customers are being served by the waiter.

Past Simple

Active: The waiter served the customers.

Passive: The customers were served by the waiter.

Past Continuous

Active: The waiter was serving the customers.

Passive: The customers were being served by the waiter.

Present Perfect Simple

Active:... Continue reading "English Grammar and Vocabulary Guide: Conditionals, Passive Voice, and More" »

5. Describe what is electrodeposition, describe the different Experimental methods. Give examples. Advantages and disadvantages. It is the process of production a coating, usually Metallic, on a surface by the action of an electric current._Experimental Methods::-Electroplating: It is a plating process in which metal ions in a Solution are moved by an electric field to coat an electrode. Metallic cations From a solution are reduced on a conductive object (to form a thin layer).-Electrophoretic Deposition:Colloidal particles suspended in a liquid migrate under the Influence of an electric field (electrophoresis) and are deposited onto an Electrode._Advantages: uniform coating thicknen,easy control,high speed of Coating and high pucity._Disadvantages:

Uniform Civil Code in India

A common civil code, popularly known as the Uniform Civil Code (UCC), is a long-standing unresolved debate in independent India. This debate stems from Article 44 of the Indian Constitution, contained in Part 4 (Directive Principles of State Policy), which states the state shall endeavor to secure for the citizens a Uniform Civil Code throughout the territory of India. Here, the term Uniform Civil Code (UCC) implies a set of common laws governing marriage, divorce, adoption, inheritance, and other such familial matters which would be applicable to all Indians, irrespective of their religion. Today, the members of each religious community follow their own respective sets of civil laws based on their religious history... Continue reading "Uniform Civil Code in India: History and the Shah Bano Case" »

Full Crown Veneer

Indications:

• Extensive destruction from caries or trauma
• Endodontically treated teeth
• Existing restorations
• Correction for occlusal plane

Contraindications:

• Less than maximum retention
• Esthetics

Advantages:

• Strong
• High retentive quality
• Easy to obtain
• Adequate resistance form

Disadvantages:

• Removal of large amount of tooth structure
• Adverse effect on tissues
• Vitality testing not readily feasible
• Display of metal

Porcelain-Fused-to-Metal (PFM) Crown

Indications:

• Esthetics if all-ceramic is contraindicated
• Gingival involvement

Contraindications:

• Large pulp chamber
• Intact buccal wall

Advantages:

• Superior esthetics compared to complete cast crown

Disadvantages:

• Removal of substantial tooth structure
• Subject to fracture
• Difficult to obtain accurate occlusion
• Shade

Representation of Preferences by Indifference Curves

An indifference curve shows the consumption baskets that yield the same level of satisfaction to the consumer. The consumer is indifferent between various combinations within the indifference curve. The slope at any point on an indifference curve is equal to the rate at which consumers are willing to substitute one good for another. This relationship is called the marginal rate of substitution (MRS). The rate at which a consumer is willing to trade Pepsi for pizza depends on who has more hunger or thirst, which depends in turn on how much pizza and Pepsi they have.

As a consumer prefers a larger quantity of goods, they prefer higher indifference curves to lower ones.

Four Properties of Indifference

Cisco Router and Switch Configuration

PPP Authentication

1. User Configuration (Matching Passwords on Both Routers)

router(config)# username <hostname_remote_router> password <password>

2. Interface Encapsulation Change

router(config-if)# encapsulation ppp

3.1 Enabling PAP Authentication

router(config-if)# encapsulation ppp
router(config-if)# ppp authentication pap
router(config-if)# ppp pap sent-username <local_username> password <password>

3.2 Enabling CHAP Authentication

router(config-if)# encapsulation ppp
router(config-if)# ppp authentication chap

DHCP Scope Configuration

router(config)# ip dhcp pool <POOL_NAME>
router(config-dhcp)# network <NETWORK_ADDRESS> <NETMASK>
router(config-dhcp)# default-router <GATEWAY_