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Computer science  There have been a couple OpenSource Anti Virus projects are available, but most of them how about ,I know they have been disapear ,closed or  off some years ago years ago. but in these days i only listen about some OpenSource Anti Virus product I am aware of. There are several companies which have free OpenSource Antivirus software programs for personal use, but that is not fully as open source. Free Antivirus/openSource vs. Paid Antivirus antivirus which is free or Open Source project tools are so good, than why we should pay? But in all of then we got that a few of AntiVirus products are free for personal users or a non-commercial person; if anybody want to protect their business or commercial plateform, than he must paid for that edition. At that point, you should consider upgrading to a full security suite. in the Other Hand, For personal use, most of the pay antivirus tools gives more than of their free Versions—Even sometimes it gives a lot more protect...

 Inorganic chemistry | Chemistry.   Thomson Model of Atom  What is thomson model of atom ?              J. J. Thomson, in 1898, proposed that an atom possesses a spherical shape (radius approximately 10^-10 m) in which the positive charge is uniformly distributed. The electrons are embedded into it in such a manner as to give the most stable electrostatic arrangement. Many different names are given to this model, for example, plum pudding, raisin pudding or watermelon .                    visualised as a pudding or watermelon of positive charge with plums or seeds (electrons) embedded into it. An important feature of this model is that the mass of the atom is assumed to be uniformly distributed over the atom. Although this model was able to explain the overall neutrality of the atom, but was not consistent with the results of later experiments. Thomson was awarded Nobel Prize ...

BASIC CONCEPTS OF CHEMISTRY Overview on Chemistry.Day-Today use of chemistry?A short description on chemistry ? History of Chemistry & History of Chemistry in India ?       Chemistry, as we understand it today, is not a very old discipline. Chemistry was not studied for its own sake, rather it came up as a result of search for two interesting things:      i. Philosopher’s stone (Paras) which would convert all baser metals e.g., iron and copper into gold.      ii.‘Elexir of life’ which would grant immortality.           People in ancient India, already had the knowledge of many scientific phenomenon much before the advent of modern science. They applied that knowledge in various walks of life. Chemistry developed mainly in the form of Alchemy and Iatrochemistry during 1300-1600 CE. Modern chemistry took shape in the 18 th century Europe, after a few centuries of alchemical traditions whi...

            Inorganic chemistry | Chemistry What is quantum mechanical model of atom ? What is Schrödinger Equation ? Relation between hydrogen atom and the schrödinger equation ? | Inorganic chemistry | Chemistry. WHAT IS QUANTUM MECHANICAL MODEL OF ATOM ?          Classical mechanics, based on Newton’s laws of motion, successfully describes the motion of all macroscopic objects such as a falling stone, orbiting planets etc., which have essentially a particle-like behaviour as shown in the previous section. However it fails when applied to microscopic objects like electrons, atoms, molecules etc. This is mainly because of the fact that classical mechanics ignores the concept of dual behaviour of matter especially for sub-atomic particles and the uncertainty principle. The branch of science that takes into account this dual behaviour of matter is called quantum mechanics .           Quantum mechanics is...

  Isobars and Isotopes            The composition of any atom can be represented by using the normal element symbol (X) with super-script on the left hand side as the atomic mass number (A) and subscript (Z) on the left hand side as the atomic number .             Isobars are the atoms with same mass number but different atomic number for example, ¹⁴ 6 C  and ¹⁷ 7 N. On the other hand, atoms with identical atomic number but different atomic mass number are known as Isotopes . In other words, it is evident that difference between the isotopes is due to the presence of different number of neutrons present in the nucleus. For example, considering of hydrogen atom again, 99.985% of hydrogen atoms contain only one proton. This isotope is called protium (¹ 1 H). Rest of the percentage of hydrogen atom contains two other isotopes, the one containing 1 proton and 1 neutron is called deuterium (² 1 D, 0.015%) and the other o...

              Inorganic Chemistry |Chemistry   Discovery of Protons and Neutrons           Electrical discharge carried out in the modified cathode ray tube led to the discovery of canal rays and anode rays carrying positively charged particles. The characteristics of these positively charged particles are listed below.      (i) Unlike cathode rays, mass of positively charged particles depends upon the nature of gas present in the cathode ray tube. These are simply the positively charged gaseous ions.       (ii) The charge to mass ratio of the particles depends on the gas from which these originate.       (iii) Some of the positively charged particles carry a multiple of the fundamental unit of electrical charge.      (iv) The behaviour of these particles in the magnetic or electrical field is opposite to that observed for electron or cathode rays. ...

              Inorganic chemistry | chemistry Change to Mass Ratio of Electron             In 1897, British physicist J.J. Thomson measured the ratio of electrical charge ( e ) to the mass of electron ( m e ) by using cathode ray tube and applying electrical and magnetic field perpendicular to each other as well as to the path of electrons. When only electric field is applied, the electrons deviate from their Path and hit the cathode ray tube at point A. Similarly when only magnetic field is applied, electron strikes the cathode ray tube at point C. By carefully balancing the electrical and magnetic field strength, it is possible to bring back the electron to the path which is followed in the absence of electric or magnetic field and they hit the screen at point B. Thomson argued that the amount of deviation of the particles from their path in the presence of electrical or magnetic field depends upon:      ...

                Inorganic chemistry | Chemistry   Discovery of Electron                   In 1830, Michael Faraday showed that if electricity is passed through a solution of an electrolyte, chemical reactions occurred at the electrodes, which resulted in the liberation and deposition of matter at the electrodes. These results suggested the particulate nature of electricity.           In mid 1850s many scientists mainly Faraday began to study electrical discharge in partially evacuated tubes, known as cathode ray discharge tubes . A cathode ray tube is made of glass containing two thin pieces of metal, called electrodes, sealed in it. The electrical discharge through the gases could be observed only at very low pressures and at very high voltages. The pressure of different gases could be adjusted by evacuation of the glass tubes. When sufficiently high vo...

What is password attacks ? How many types of password attacks ? How to keep safe your self from hacking by password attacks ? Hi , my dear friends i’m goning to discuss about a toppic which terified whole world in this degital generation.so i decided to write on this toppic. Here in this topic i talk about some general quetions like - what is password attacks ? How many types of password attacks ?How to keep safe your self from hacking by password attacks ? How to be safe from them ? What is password attacks ? How many types of password attacks ? How to keep safe your self from hacking by password attacks ? Password Attacks – An attemp to obtain or decrypt a user’s password for illegal use. Hackers can use cracking programs , ddictionary attacks, and password sniffers in password attacks. Defence against password is rather limited but usually consists of a passwors policy including a minimum length , unrecognizable word , and frequent changes. Type of Password attacks -  ...