Sunday, April 22, 2012

Electro-Chemistry


Electro-Chemistry
(Chapter – 7)

Electro-Chemistry
The branch of chemistry which deals with the study of chemical energy to electrical energy or electrical energy to chemical energy is called electro-chemistry.


Conductors
Those substances through which electric current can pass are called conductors. For example all metals are conductors.


Non-Conductors
Those substances through which electric current cannot pass are called non-conductors. For example plastic, wood are non-conductors.



Solution and Suspension



Solution and Suspension
(Chapter-6)


Solution
A homogeneous mixture of different chemical substances which has uniform chemical composition through out and shows uniform physical properties is called solution. For example dissolve a small amount of copper sulphate in water the water will become blue. If this blue liquid is filtered, it will pass through the filter paper without leaving any solid. The mixture thus prepared is called a solution.


Binary Solution
A solution which is formed by mixing two substances is called binary solution. For example solution of glucose and water.

States of Matter


States of Matter
(Chapter-5)



States of Matter
Matter has three states:
1. Gas
2. Liquid
3. solid
These are physical states of matter. The three states of one matter may have different physical properties while their chemical properties are same. Water exists in three physical states solid (ice), liquid and gas(steam) has same chemical properties.


Periodicity of Elements & Periodic Table


Periodicity of Elements and Periodic Table
(Chapter – 4)


Definitions
Periodic Table
A table of elements obtained by arranging them in order of their increasing atomic number in which elements having similar properties are placed in the same group is called Periodic Table.


Group
The vertical column of elements in the periodic table are called Groups.


Period
The horizontal rows of elements in the periodic table are called Periods.


Periodicity
The repetition of physical and chemical properties of elements periodically is called Periodicity of Properties.



Atomic Structure


Atomic Structure
(Chapter-3)

Dalton’s Atomic Theory
The important postulates of Dalton’s atomic theory are:
1. All elements are composed of atoms. Atom is too small so that it could not be divided into further simpler components.
2. Atom cannot be destroyed or produced.
3. Atoms of an element are similar in all respects. They have same mass and properties.
4. Atoms of different elements combine in a definite simple ratio to produce compounds.



Discovery of Electron
A discharge tube is a glass tube. It has two electrode, a source of electric current and a vacuum pump.
(Diagram)
Sir William Crooks (1895 performed experiments by passing electric current through gas in the discharge tube at very low pressure. He observed that at 10-4 (-4 is power to 10) atmosphere pressure, shining rays are emitted from cathode. These rays were named cathode rays. Cathode rays are material particles as they have mass and momentum.


Chemical Combination & Chemical Equation


Chemical Combinations & Chemical Equation   
(Chapter-2)


Laws of Chemical Combinations
There are four laws of chemical combinations these laws explained the general feature of chemical change. These laws are:
1. Law of Conservation of Mass
2. Law of Definite Proportions
3. Law of Multiple Proportions
4. Law Reciprocal Proportions 


Antoine Lavoiser has rejected the worn out ideas about the changes that take place during a chemical reaction. He made careful quantitative measurements in chemical reactions and established that mass is neither created nor nor destroyed in a chemical change. 



Introduction to Chemistry



Introduction to Chemistry
(Chapter-1)


Chemistry
The branch of science which deals with the study of matter,its composition and structure, changes in matter and laws and principles which govern these changes.

Matter
Anything that has mass and occupies space is called matter.For example,gases,air and water etc.

Branches of Chemistry
Some main branches of chemistry are as follows:

Tuesday, March 20, 2012

Special Characters in HTML


left single quote‘
right single quote’
single low-9 quote‚
left double quote“
right double quote”
double low-9 quote„
dagger†
double dagger‡
per mill sign‰
single left-pointing angle quote‹

Thursday, June 2, 2011

8 Reasons to Build Your Own PC


Building your own PC is as rewarding as ever. Fortunately, it still makes plenty of sense, too.
It's true that you can't beat the convenience of today's retail PCs. As consumer interest shifts to laptops and cell phones, desktop PC sales still carve out a substantial niche in the market. On paper, they look pretty good. These days, they're fully specified with quad-core CPUs, 6GB of DDR3 RAM, and large hard drives. Many of the lower-end models come with free PCIe slots, at least the ones in regular tower cases.
In theory, a gamer could go with a $600 Gateway, Dell, or HP configuration, and then add a better video card. That would be a perfectly fine PC for most folks. Even for gaming, it would work for a while, providing you kept the extra video card to a shorter, lower-end model that fits inside the case, and that isn't too demanding on the PSU.

Windows7 Media formats supported by default


File Type – File Name Extension(s) – Description


3GPP/3GPP2 Audio/Video
.3gp, .3gpp, .3g2, .3gp2
Allows delivery and playback of multimedia over 3G wireless networks.


ADTS Audio
.aac – Used for streaming audio content from media players or websites in Advanced Audio Coding (AAC) or MPEG-4 Audio formats.


AVCHD Video – .m2t, .m2ts, .mts – High-definition video container format used by many portable video recorders. It typically uses the H.264 video compression codec (also known as MPEG-4 AVC).


MP4 Video – .m4v, .mp4, .mp4v – This widely used high-definition video container format typically uses H.264 video compression.


MPEG-2 TS Video – .ts, .tts – A streaming format used to deliver synchronized digital audio and video; commonly used in European digital TV systems.


MPEG-4 Audio – .m4a – Also known as Advanced Audio Coding (AAC), this is the default format used by Apple’s iTunes software and online music store; files in this format that use Apple’s FairPlay copy protection are not supported, nor are those that use Apple Lossless Format.


QuickTime Movie – .mov – A container format used by many portable video cameras.

Microsoft Windows 7 Various Editions Description


Windows® 7 Enterprise
Enterprise is the business-focused SKU for managed environments, advanced data protection, networking and security needs. Enterprise will ship in both 32-bit and 64-bit versions.


Windows® 7 Ultimate
Ultimate is the no-compromise SKU for those who want all Windows features, including business.
Windows 7 Ultimate has the same features as the Enterprise Edition, but is licensed differently.
Ultimate will ship in both 32-bit and 64-bit versions.


Windows ® 7 Professional 
Professional is the business-focused SKU for small and lower mid-market companies and users who have networking, backup, and security needs and multiple PCs or servers.
Professional will ship in both 32-bit and 64-bit versions.


Windows® 7 Home Premium 
Home Premium is the standard consumer SKU, providing full functionality on the latest hardware and easy ways to connect. Home Premium features advanced graphics effects, support for touch-screen interfaces, and Media Center, among other features.
Home Premium will ship in both 32-bit and 64-bit versions.


Windows® 7 Home Basic 
Home Basic is a simple version of Windows 7. It offers a basic Windows interface andfeature list. Home Basic is meant for accessing the internet and running basic productivity applications.
This version of Windows is offered through OEM and retail channels in emergingmarkets only.
Home Basic will ship in both 32-bit and 64-bit versions.


Windows® 7 Starter 
This edition of Windows 7 is aimed at beginning computer users. It has the fewest features of the Windows 7 editions. Windows XP and Vista also had Starter Editions with significant limitations. Windows 7 Starter Edition will be available to OEMs worldwide.
This version of Windows is offered worldwide through OEMs only.
Starter will ship in a 32-bit version only.

Friday, May 27, 2011

Useful Hints & Tips for MS Excel


1. Use Smart Tags in XP
Office XP features Smart Tags, which are like intelligent links to websites or locations on your PC's hard disk. Excel will recognise certain words and show Smart Tag action buttons next to them. Go to the AutoCorrect options part of the Tools menu and select Smart Tags to see which words it will recognise.

2. Spot corrections and errors
If you share Excel documents with others, it can be useful to see any changes they have made. Excel 2000 used red triangular indicators to highlight cells in which there were comments. In Excel 2002, there are purple indicators for Smart Tags and green ones for possible errors in formulas. Options can be found in the Tools menu, under the Error Checking tab of Options.

3. Open older macros
You will probably not be able to open old macros (from Excel 97 or 2000 workbooks) in Excel 2002 as the program will throw up a security warning notice. If you need to use old macros, go to the Tools menu and select Options, Security, then Macro Security and make sure Low is selected. Under Trusted Sources, place a tick in the Trust add-ins and Trust Visual Basic boxes. You will then need to restart Windows before you can run your old macros.

4. View important cells
Using the Watch window you can keep an eye on important cells in a spreadsheet. Click on a cell containing data and go to the Tools menu, choose Formula Auditing and then Show Watch Window. Click on Add Watch and it will display values and formulas for any cell of any open workbook.

5. Use labels in cells
You can make Excel work with labels you have given to cells instead of having to use the cell position ('Profit' instead of 'A6', for example). Go to Options in the Tools menu, and click on the Calculation tab, then tick the 'Accept labels in formulas' box.

6. Create formulas
Create a formula by clicking on the Paste Function tool (which is marked 'fx') on the standard toolbar. If you select a function from the list, its description will appear in the dialogue box, and the Help button will explain more about the formula. Alternatively, clicking on the equals sign in the formula bar will display a list of recently used functions.

7. Links
If you are seeing error messages about broken or invalid links to other workbooks or other applications, go to the Options part of the Tools menu and choose the Workbook Options tab. Make sure the box marked 'Update Remote References' is ticked. If you tick the box marked 'Save External Link Values', you won't have to worry about maintaining links but your file may end up significantly larger.

8. Create subtotals
It's easy to create sums of columns using the AutoSum tool but what about subtotals? Creating these needn't be hard either. Just use the function =SUBTOTAL (9,B2:B10). The 9 is a function number, representing SUM, and you should replace the cell references with the ones from your own worksheet. You could place it in cell B11 and then repeat it with figures below, say =SUBTOTAL (9,B12:B20), in cell B21. If you then used the AutoSum tool in cell B22 it would just display the sum of the subtotals, from cells B11 and B21.

9. Delete vs clear
There two ways to remove information from cells: Delete and Clear. Clicking on a cell and selecting Delete (or pressing Del or Backspace) will remove the cell's value or formula, but any formatting and comments will remain in place. If you want to return the cell to its original state, with no formatting, choose Clear instead.

10. Informative printouts
Many of us have spreadsheets that spread over more than a page. If you want your column titles to print on every page, go to the File menu, click on Page Setup and go to the Sheet tab. Click on the red arrow in the box marked 'Rows to repeat at top' and select the rows that contain your column titles, then click on OK.

11. Delete comments
You can delete all the comments from your worksheet at once, for instance if you have finished the sheet and want to distribute it without annotations. Press Control, Shift and O at the same time, and this will select all the cells in the worksheet that contain comments. Right-click on one of them and select Delete Comment, then click anywhere on the sheet and all the comments will have vanished.

12. Keep track of online orders
When you order online, it can be hard to keep a record of all your orders. You can, however, transfer the table from the confirmation email the retailer sends you into an Excel workbook. Open the email and click at the start of the table, then hold down Shift and click at the end of the table. Right-click on it and choose Copy, then open a blank Excel worksheet. Right-click on a cell and choose Paste. You may have to correct the formatting for it to look better.

13. Figuring out formulas
If you have a formula that's puzzling you because you can't figure out how it was derived, click on the cell that contains it, and choose the Auditing option in the Tools menu, and select Trace Precedents. You will see blue dots in the relevant cells, with arrows pointing towards the formula. When you have finished, choose Remove All Arrows.

14. Import finance data
You can import data from most online banks and finance programs into Excel, but it's often not quite as simple as just opening the document in Excel. It will usually be in Comma Separated Value (.csv) format. In Excel, click on the File menu and choose Open, then choose 'Text Files (*.txt, *.prn, *.csv)' from the 'Files of type' box, and select the CSV file you obtained from the bank website. Once it has opened, just adjust the column widths so they look right.

15. Show zeros the door
You can remove zeros that you don't need from your cells by going to Tools, Options and then View, and removing the tick from the Zero values box. If you want zeros to appear in certain cells, give those cells the custom format '0;-0;;@'. To enter a custom format, go to Format and Cells, and choose the Number tab, then select Custom and enter the format. For dashes to appear instead of zeros, use the custom format '0;-0;?-?;@'.

Useful Hints & Tips for MS Word


1. Date
To stop Word from adding today's date to any year you type, changing, say, 'Letter 2004' to 'Letter 2004-08-22', go to the Insert menu, click on AutoCorrect and select AutoText in the next menu. Untick the box marked 'Show Autocomplete Suggestions'. If you want to use an AutoText shortcut in future, type the abbreviation and press F3.

2. Add places
Add a folder to the Places Bar in Word 2002's Open and Save boxes to help you find files quickly. Find the folder you require in Windows Explorer, highlight it and then click on the Tools menu. Now click on the option marked 'Add to My Places'.

3. Turn off fast save
Fast saves aren't much faster than normal saves and instead of properly saving your document, Word just appends anything you have added to the text to the end of the file. Nothing is ever deleted from the document file, so it can end up being huge. It's best to turn off fast saves by going to the Tools menu, clicking on Options, then on the Save tab and removing the tick from the 'Allow fast saves' checkbox.

4. No mouse styles
If you often write the same style of documents in Word, you may be aware of the Styles option, which can reduce the time you spend formatting a document. You can assign a keyboard shortcut to a style so that you don't have to use the mouse to find it by going to the Tools menu, then Customize, then pressing Keyboard and selecting Styles from the list on the left.

5. Follow style
If your styles naturally follow one another, say a particular text style always follows a particular headline style, you can cut down further on the time required to select them by going to the Format menu, and selecting Style. Choose the relevant style and click on Modify, then choose another from the box marked 'Style for following paragraph'.

6. Repeat find
To find a piece of text, press F3, enter the text you're looking for in the text box and press Enter. You don't need to keep the box open to find other instances of this text, however. Click on Cancel, and notice that the double arrows at the bottom of the right-hand side scroll bars have turned blue. Clicking on one of them will take you to the next place this text occurs, either forwards or backwards through the document, depending on which button you click.

7. AutoCorrect
AutoCorrect allows you to change text automatically as you type it, which can be handy for correcting frequently mistyped words. Click on the Tools menu, then on AutoCorrect and enter a piece of text in the left-hand column. Whenever you type it, it will be replaced by the text in the same row in the right-hand column of the dialogue box.

8. Select lots of text
It can be very difficult to select more than a few paragraphs of text at once using only the mouse, particularly if you have a fast PC, as the text will shoot past before you notice. But you can select large amounts of text easily by clicking where you want your selection to start, then navigating to the end of the intended selection using the mouse wheel or scroll bars. Then just hold down Shift and click again to select the block of text.

9. Saving grace
If you are working on several documents at once, you can save them all without closing Word in the process. Just hold down Shift and click on the File menu. You will see a new option Save All. There is also an option to Close All if you want to do so without closing Word.

10. Simple formatting
If you're going to create a number of documents that are similar in appearance, it's best to use styles to format text rather than applying the formatting yourself. This ensures that you can change it easily throughout the documents, if you need to. You can, however, use the Format Painter to copy the formats from one paragraph and apply it to another. Select the Format Painter button from the Word toolbar and click on the portion of text you want to copy a format from. Now drag the pointer over the selection you want to apply the formatting to.

11. Scraps
You can create 'scraps' in Word, which are small blocks of text from a document. Highlight some text in an open document and drag it to the Desktop, and you will see it appear as a document scrap. You can arrange and rename your scraps on the Desktop, and simply drop them back into Word documents as you need them. The scraps can be pasted into most other applications too.

12. Snappy corrections
Instead of using the spell checker once you've finished writing a document, you can correct words as you type. Right-click on a red-underlined word, and Word will show you a menu of replacements it thinks are suitable. This also works for green-underlined phrases that Word thinks are not grammatically correct. Right-clicking them will again open a menu with suggested replacements.

Seven Website Design Tips to Make Your Site More Attractive

"How can I attract thousands of visitors to my site?", many people ask me this question. Well, driving high traffic to Website is very important, but what's even more important, is designing a website in that way which makes them stays longer.

In this article, you're going to learn 7 important website design tips to make your site more attractive. So not only your website will attract many people, but it will also motivate them to stay for a long time.

1. Be Aware during Selection of the colours scheme 

If your company has a logo or preferred colours on its stationery that's a good start. For those of you starting from scratch, choose two or three complementary colours and stick with them – don't change colours on every page. The most common colour schemes include:
- Red, yellow and white
- Blue and white
- Red, grey and white
- Blue, orange and white
- Yellow, grey and white.
- Onion shade, Tan, white
If you're not sure what colour scheme to choose, surf the internet and find a website that you like. You can then model your colour scheme on what already exists.
Always Select those colours which Attract the visitors, and the person revisit your site.

2. Page Backgrounds 

Ensure your visitors can read the text on the background, i.e. no black writing on dark blue background or yellow on white. Means if the page background is dark always use light colour for the writhing a text or if the light colour is used for the page background the always use dark colour for writing a text, like this colour scheme for the background everything is visible to the visitor. Also be careful that your links are visible before and after being visited. The default for links in most programs is blue (before being visited) and burgundy (after being visited), so if you have a dark background, ensure your links are light.

3. (Page loading) site open within a minutes 

All I've seen for the last 10 minutes is 'page loading', I think something might be wrong with my browser this is probably one of the biggest gripes a site visitor has. If your page takes more than a minute to load (on dial-up) and you have anything less than the meaning of life hidden within your content - something needs to be done. The average person does not have time they just go for another site without passed his time for these type of site those take time to open. So a good website takes less time for loading a site.

4. Appropriate page Size 

Web pages are measured in pixels. Pixels are the unit of measurement for the screen. A Web page can literally be any size. Standard Web pages usually fit into a few sizes:
+ W × H + 600 × 800 + 640 × 480 (Dream weaver default) + 1024 × 768 + 550 × 400 (Flash default)
The default Web page sizes provided in Web friendly applications and listed earlier are a great place to start. You will probably use a smaller, custom size for pop-up windows. The Web page size you choose is up to you. Remember to use actual space for the Web page effectively so that the content is in the proper proximity to the user's navigation patterns. Web page size affects the way users move around the Web pages and the Web portfolio site. One rule: Pick a size for all main screens and stick to it.

5. Logo 

Create a simple logo to identity your website. Have a captivating tag line somewhere with the header, and write an About Us page which describes the uniqueness of your website. These will leave an impression for your visitors to remember your website.

6. Application of graphic designs

You must be careful in choosing for the appropriate design that will best represent your projects, and tell about your business. Create a design which coveys in a stylish way what it has to

7. Be aware about grammar and spell 

Grammar is overrated [and the spill-checker too] Most web authoring and word processing software comes with a spell/grammar check utility - don't let your hard earned money go to waste, use it. Some of the more common grammatical mistakes are misusing its, it's, there, their, they're, your, you're, and noone (correct=no one). Proof reading your final product is also helpful. No one is infallible, that's why pencils have erasers and computer programs have [ctrl+z].

5 Ways to Keep Visitors Coming Back

A lot of successful websites depend on returning visitors to account for a major part of their traffic. Returning visitors are easier to convert into paying customers because the more often they return to a site, the more trust they have in that site. The credibility issue just melts away. Hence, keep your visitors coming back to your site with the following methods:

1) Start a forum, chatroom or shoutbox 

When you start a forum, chatroom or shoutbox, you are providing your visitors a place to voice their opinions and interact with their peers -- all of them are visitors of your site. As conversations build up, a sense of community will also follow and your visitors will come back to your site almost religiously every day.

2) Start a web log (blog) 

Keep an online journal, or more commonly known as a blog, on your site and keep it updated with latest news about yourself. Human beings are curious creatures and they will keep their eyes glued to the monitor if you post fresh news frequently. You will also build up your credibility as you are proving to them that there is also a real life person behind the website.

3) Carry out polls or surveys 

Polls and surveys are other forms of interaction that you should definitely consider adding to your site. They provide a quick way for visitors to voice their opinions and to get involved in your website. Be sure to publish polls or surveys that are strongly relevant to the target market of your website to keep them interested to find out about the results.

4) Hold puzzles, quizzes and games

Just imagine how many office workers procrastinate at work every day, and you will be able to gauge how many people will keep visiting your site if you provide a very interesting or addicting way of entertainment. You can also hold competitions to award the high score winner to keep people trying continuously to earn the prize.

5) Update frequently with fresh content

Update your site frequently with fresh content so that every time your visitors come back, they will have something to read on your site. This is the most widely known and most effective method of attracting returning visitors, but this is also the least carried out one because of the laziness of webmasters. No one will want to browse a site that looks the same over ten years, so keep your site updated with fresh bites!

In summary, A lot of successful websites depend on returning visitors to account for a major part of their traffic. Returning visitors are easier to convert into paying customers because the more often they return to a site, the more trust they have in that site.The credibility issue just melts away. Hence, keep your visitors coming back to your site with the following methods:

1) Start a forum, chatroom or shoutbox
2) Start a web log (blog)
3) Carry out polls or surveys
4) Hold puzzles, quizzes and games
5) Update frequently with fresh content