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Archive - August 2021

Insert, Delete, and Update Statements in SQL
  • Computer Science

Insert, Delete, and Update Statements in SQL

August 30, 2021
by Santhakumar Raja
6 min read
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In SQL, three commands can be used to modify the database: INSERT, DELETE, and UPDATE. We discuss each of these in turn. The INSERT Command In its simplest form, INSERT is used to add a single tuple to a relation. We must specify...

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Partial Balancing of Primary Unbalanced Force of Reciprocating Engine
  • Mechanical

Balancing of Single Cylinder Reciprocating Engine

August 30, 2021
by Santhakumar Raja
3 min read
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Consider a reciprocating engine mechanism OCP shown in Fig, the piston mass at P of the reciprocating parts is accelerating. Thus a primary force is required to accelerate the reciprocating mass. This force acts in a direction...

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Reciprocating Engine Mechanism
  • Mechanical

Primary and Secondary Forces of Reciprocating Masses

August 29, 2021
by Santhakumar Raja
3 min read
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A reciprocating engine say, an IC engine has both rotating and reciprocating parts. The rotating masses in a single cylinder and a multi cylinder can be balanced using the methods already discussed in the previous chapter. The...

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Undamped free transverse vibration
  • Mechanical

Natural Frequency of Free Transverse Vibrations

August 29, 2021
by Santhakumar Raja
2 min read
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In the following sections, the frequency of transverse vibrations of various systems and the phenomenon of whirling speed have been discussed. Natural Frequency of Free Transverse Vibrations Consider a shaft of negligible mass...

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  • Computer Science

SQL Data Definition and Data Types

August 29, 2021
by Santhakumar Raja
3 min read
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SQL uses the terms table, row, and column for the formal relational model terms relation, tuple, and attribute, respectively. We will use the corresponding terms interchangeably. The main SQL command for data definition is the...

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  • Computer Science

Relational Model Constrains and Relational Database Schemas

August 28, 2021
by Santhakumar Raja
5 min read
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So far, we have discussed the characteristics of single relations. In a relational database, there will typically be many relations, and the tuples in those relations are usually related in various ways. The state of the whole...

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  • Computer Science

Relational Model Concepts in DBMS

August 28, 2021
by Santhakumar Raja
12 min read
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The relational model represents the database as a collection of relations. Informally, each relation resembles a table of values or, to some extent, a flat file of records. It is called a flat file because each record has a...

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Network model notation
  • Computer Science

Classification of Database Management Systems

August 27, 2021
by Santhakumar Raja
8 min read
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Several criteria are normally used to classify DBMSs. The first is the data model on which the DBMS is based. The main data model used in many current commercial DBMSs is the relational data model. The object data model has been...

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Physical two tier client server
  • Computer Science

Centralized and Client/Server Architectures for DBMSs

August 26, 2021
by Santhakumar Raja
9 min read
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Centralized DBMSs Architecture Architectures for DBMSs have followed trends similar to those for general computer system architectures. Earlier architectures used mainframe computers to provide the main processing for all system...

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Database System
  • Computer Science

The Database System Environment

August 26, 2021
by Santhakumar Raja
8 min read
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A DBMS is a complex software system. In this section we discuss the types of software components that constitute a DBMS and the types of computer database system software with which the DBMS interacts. DBMS Component...

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  • Growth of Animal Cells in Culture
    by Santhakumar Raja
  • Evaluation of Microbial Stability of Formulations Evaluation of Microbial Stability of Formulations
    by Santhakumar Raja
  • Preservation of Pharmaceutical Products Using Antimicrobial Agents Preservation of Pharmaceutical Products Using Antimicrobial Agents
    by Santhakumar Raja
  • Assessment of Microbial Contamination and Spoilage Assessment of Microbial Contamination and Spoilage
    by Santhakumar Raja
  • Standardisation of Amino Acids Standardisation of Amino Acids – theteche.com
    by Santhakumar Raja
  • Cavities Prepared in Sterile Agar Medium for Assay of Antibiotics Cup-Plate or Cylinder-Plate Method
    by Santhakumar Raja
  • Microbiological Assay by Tube Assay Method Turbidimetric or Tube Assay Method
    by Santhakumar Raja
  • Curve of Diameter of Zone of Inhibition versus Log Concentration of Antibiotics Methods for Standardisation of Antibiotics
    by Santhakumar Raja
August 2021
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