Hello World CGI Script in Perl

A CGI script can be as simple or complex as you need it to be. It could be in Perl, Java, Python or any programming language. At its core, a CGI application simply takes a request via HTTP (typically a web browser) and returns HTML. Lets look at a simple Perl  Hello World CGI script and break it down into its simplest forms. Hello World CGI Perl Script #!/usr/bin/perl print Content-type: text/html\n\n; print HTML; html head titleA Simple Perl CGI/title /head body h1A Simple Perl CGI/h1 pHello World/p /body HTML exit; If you run the program on the command line, youll see that it does exactly what youd expect. First, it prints the Content-type line, then it prints the raw HTML. In order to see it in action in a web browser, youll need to copy or upload the script to your web server and make sure the permissions are set correctly (chmod 755 on *nix systems). Once youve set it correctly, you should be able to browse to it and see the page displayed live on your server. The key line is the first print statement: print Content-type: text/html\n\n; This tells the browser that the document coming after the two newlines is going to be HTML. You must send a header so the browser knows what type of document is coming next, and you must include a blank line between the header and the actual document. Once the header is sent, its just a matter of sending the HTML document itself. In the above example, were using a here-doc to simplify printing a large chunk of plain text. Of course, this is really no different than having a plain HTML document sitting on your server. The real power of using a programming language like Perl to create your HTML comes when you add in some fancy Perl programming. Adding on to the Basic Script In the next example, lets take part of this  time and date script and add it to your web page. #!/usr/bin/perl months qw(Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec); weekDays qw(Sun Mon Tue Wed Thu Fri Sat Sun); ($second, $minute, $hour, $dayOfMonth, $month, $yearOffset, $dayOfWeek, $dayOfYear, $daylightSavings) localtime(); $year 1900 $yearOffset; $theTime $weekDays[$dayOfWeek] $months[$month] $dayOfMonth, $year; print Content-type: text/html\n\n; print HTML; html head titleA Simple Perl CGI/title /head body h1A Simple Perl CGI/h1 p$theTime/p /body HTML exit; This new CGI script will insert the current date into the page each time the script is called. In other words, it becomes a dynamic document that changes as the date changes, rather than a static document.

Business Ethics Gumdrop Northern Essay - 1597 Words

In Gumdrop Company, there were various ethical issues identified when it was operating in America. The unethical aspects caused various problems to not only the company, but also other persons using its products. These issues eventually led to the closure of the company in America through corrupt and improper channels; but it opened up new branches in Argentina and Columbia. One of the ethical issues was production of landmines that were banned by the international community. This concern is founded on the fact that landmines were used in wars and the effects they have on the land and residents are too hazardous to be accepted. The landmines pose as severe threats to not only the planters, but also unsuspecting humans and animals. By†¦show more content†¦Contrary to the armors’ requirements, the ones developed by Gumdrop were substandard and they barely protected the wearers. This was irresponsibility and greed; in addition, it was an aspect of disrespect for human life. The company failed in its mandate of ensuring that the soldiers were safe during an attack and practiced indecency by manufacturing substandard products and keeping quite to protect their contract. The management should have come clean about the conditions of the armors and either ask the soldiers to return the armors already in use for exchange or give out new armors that would assure the soldiers of security and safety. The company should have taken responsibility and admit its error to the military and try to re-negotiate the contract terms rather than jeopardizing the lives of the soldiers, who entrusted their lives on the jackets. The company hence broke the trust that was entrusted on it by the soldiers and the citizens by making the soldiers vulnerable. Admitting to failures and taking responsibility not only helps in re-building the trust and credibility of an organization, but also illustrates strong character of responsibility and accountability (Fieser, 2011, p. 1). These characters were however not available in Gumdrop and instead, the major concern was the retention of the contract for increased economic gains. The substandard products

History Of A Transparent Membrane Health And Social Care Essay Free Essays

A regular flow of aqueous temper base on ballss through a squashy tissue, known as trabeculate net, and Schlemms canal. Flexing of the TM pumps aqueous temper from the anterior chamber to SC through a series of valves crossing SC. The valves deliver the aqueous temper further on to venas in the sclerotic coat [ 38, 50, 51 ] . We will write a custom essay sample on History Of A Transparent Membrane Health And Social Care Essay or any similar topic only for you Order Now The aqueous flow is controlled and powered by the force per unit area difference during systole and diastole of the cardiac rhythm, the respiration, eye blink and oculus motion [ 51 ] . The abode clip of about 100 proceedingss of the fluid allows the exchange of foods and waste to and from the lens and cornea [ 43, 52 ] . A force per unit area bead of about 0.8kPa ( 6 mmHg ) occurs as the aqueous temper progresses into the aqueous venas but this force per unit area bead can increase drastically in eyes affected by glaucoma [ 52 ] . Figure 2-8 illustrates how a force per unit area addition causes the aqueous valves within the TM to compact, diminishing the lms drastically and cut downing outflow and hence doing an accretion of AH taking to still higher IOP [ 51, 53 ] . The maximal force per unit area that can happen in an orb is set by the highest force per unit area degree in the ciliary arteria, which is, on norm, about 60mmHg ( 8.0kPa ) ( Figure 2-6 ) . Beswick et Al. [ 54 ] and H eys et Al. [ 55 ] define the trabeculate net permeableness ( kTM ) which they estimate to be 2.1 A- 10-9ms-1Pa-1 for normal IOP. The cornea is a crystalline membrane and belongs to the external portion of the outer hempen adventitia. The chief map of the cornea is to refract light into the oculus. The curvature of the cornea is greater than the remainder of the oculus and the junction with the sclerotic coat is known as sulcus sclerae. The thickness of the cornea varies between 1.2mm and 0.5mm from the outer ring of the cornea, the sulcus sclerotic coat, to the Centre. The cardinal corneal thickness ( CCT ) varies by +/-20 % between persons [ 13, 56 ] . Feltgen et Al. [ 57 ] reported that they had measured CCT in 72 patients and found a scope of 0.448 to 0.713mm. Elsheikh et Al. [ 58 ] have used CCT values of 0.32mm to 0.72mm in their numerical theoretical account to imitate distortion differences of the cornea when using an applanation device ( Goldman applanation tonometer ) . Doughty and Zaman [ 56 ] calculated the CCT from 300 informations sets from literature ( from 1968-1990 ) and calculated the CCT for corneas which were designated as normal and found the norm to be 0.534mm. The radius of curvature of human corneas has been found to be 7.9mm [ 56, 57, 59 ] . The cornea consists of 5 beds: the corneal epithelial tissue, the anterior modification membrane ( Bowman ‘s membrane ) , the chief organic structure of the cornea, substantia propria, the posterior modification lamina and the endothelium of the anterior chamber ( Figure 2-9 ) . The Young ‘s Modulus of cornea has been measured utilizing a assortment of trial methods. Smolek et Al. [ 61 ] , for illustration, have applied an internal force per unit area to human orbs in vitro and have measured the ensuing radius of curvature. They so calculated the Young ‘s Modulus utilizing LaPlace ‘s Law, i.e. presuming that the orb behaves as a thin-walled domain with changeless radius of curvature and wall thickness: where P is the known force per unit area in the orb, R is the known mensural curvature radius which can be rearranged to strive in the cornea and T is the known mensural cardinal cornea thickness. In the force per unit area scope of 2.1kPa ( 16mmHg ) to 2.8kPa ( 21 mmHg ) they found Young ‘s Modulus to be changeless at 1.03GPa. Hoeltzel et Al. [ 37 ] carried out uniaxial cyclic tensile trials on four cornea strips cut from human eyes of mean CCT 0.82mm, length 10mm-30mm and width about 2mm. The samples were tested up to strains of 0.08 % at a strain rate of 2.7A-10-4s-1 to 8.3A-10-4s-1 depending on sample length ( changeless distortion rate 0.05mm/min ) . To qualify the information, the same power jurisprudence was used as Hubbard and Chun [ 37 ] ( Equation ( 2-1 ) ) . The value of I? was about changeless at near to 2.0 for all 4 cyclic burdens, co-occuring with the power coefficient for collagen obtained by Hubbard and Chun. The I ±-value increased from 54.32MPa for the first rhythm to 98.97MPa for the 4th rhythm. The tangent moduli to the emphasis degrees of 6.4kPa and 260kPa were 0.34MPa and 0.56MPa severally, approximately tantamount to internal force per unit areas of 1.3kPa and 53kPa ( 10mmHg and 400mmHg ) severally. Elsheikh et Al. [ 62 ] presented values of Young ‘s modulus in relation to intraocular force per unit area and age. They used a cornea-sclera subdivision and applied force per unit areas up to 3.1kPa ( 35mmHg ) . Three different age groups ( 50-64, 65-79, 80-95 ) were tested and two different rates of addition of force per unit area were used ( 37.5mmHg/min and 3.75mmHg/min ) [ 63 ] . The consequences can be seen in Figure 2-11 and demo a clear decrease in Young ‘s modulus for lower rates of addition of force per unit area and a clear addition in Young ‘s modulus with age. All the measured Young ‘s moduli were in the scope of 0.16MPa and 0.96MPa. FEM simulations of the cornea have shown that values below 0.01MPa are non realistic due to the fact that the curvature radius would increase to twice that of the unpressured status when pressurised with 2.1kPa ( 16mmHg ) and that would imply a 400 % volume enlargement [ 59 ] . The big fluctuation in the mensural belongingss reviewed above can be explained with the different trials used to mensurate the belongingss ( rising prices and tensile testing ) and the extremely visco elastic behavior of the cornea which leads to a nonlinearity of the stress-strain curve and sensitiveness to fluctuations with strain rate. Therefore the â€Å" known † Young ‘s modulus varies from 0.01 to 1000MPa [ 54, 58, 59, 61, 64-67 ] . In simple footings, aqueous temper flows from the posterior chamber through the posterior tract ( spread between lens and flag ) to the anterior chamber and drains at that place through the trabeculate net ( Figure 2-10 ) . Glaucoma is defined as the status whereby aqueous temper is non able to run out at the normal rate through the trabeculate net. Even though the escape is limited, the production of aqueous temper in the ciliary organic structure continues and this leads to a force per unit area addition in the orb. The force per unit area addition distorts soft tissue within the oculus because the oculus can non freely spread out due to the hempen coating around the sclerotic coat. If the force per unit area in the oculus reaches dual its normal force per unit area of about 2kPa ( 16 mmHg ) , deformation of the nervus fibres Begins and the ocular field reduces or becomes out of focal point. Because the ocular nervus has to go through through all three adventitias ( hempen adventit ia, vascular adventitia and nervous adventitia ) , it is non enclosed in connective tissue and this makes it vulnerable to damage in glaucoma [ 38 ] . If glaucoma can be recognized at its early phases, it might be treatable utilizing drugs which cut down the production of aqueous tempers and/or constrict the student and put the border of the flag into tenseness which makes its surface more permeable to aqueous temper [ 68 ] . whereas secondary glaucomas are those where the addition in IOP is due to injury, redness or tumor of the orb. The two most common types are primary unfastened angle glaucoma and primary angle closing glaucoma. Primary open-angle glaucoma ( POAG ) is the taking cause of sightlessness [ 69, 70 ] . It can be characterised by an intraocular force per unit area above 21mmHg, an unfastened, normal looking anterior chamber angle, no eyepiece or systematic abnormalcy that might account for the raised IOP and typical glaucomatous ocular field and ocular nervus harm [ 71 ] . Figure 2-12 shows the addition of IOP caused by POAG. The black pointer shows the flow of aqueous temper from the posterior chamber to the anterior chamber. When the fluid reaches the trabeculate net it can non run out through the TM due to blockage and the force per unit area increases in the orb. Patients with primary angle-closure glaucoma ( PACG ) besides exhibit an addition in IOP ( higher than 21mmHg ) , the oculus is ruddy and the student is mid-dilated. To prove whether the trabeculate net is blocked by the flag it is necessary to measure the anterior chamber angle. Figure 2-13 illustrates how the flag can contract the angle between itself and the cornea thereby barricading the escape of aqueous tempers through the TM [ 71, 72 ] . How to cite History Of A Transparent Membrane Health And Social Care Essay, Essay examples

Compare and Contrast Two Renassaince Paintings Essay Example For Students

Compare and Contrast Two Renassaince Paintings Essay Chose for my Italian Renaissance painting the Birth of Venus. It was painted by Sandra Bottling, who lived from 1445 to 1510, with Tempera on canvas around 1484-86 and is currently located at the Galleria dogleg Fizz, Florence, chose tort my Northern Renaissance painting the Urination Wedding by Jan van Check, who lived from 1395 to 1441, Oil on oak panel of 3 vertical boards in 1434 and is currently located in the National Gallery, London. Bottling uses a more two dimensional background in his painting while van Check uses light and linear perspective to add a sense of depth to the room. Bottling does use some limited atmospheric perspective to the land mass in the distance but it still feels very flat. Bottling uses light to highlight certain items but does not use shadow consistently throughout. Van Check on the other hand uses the window as a light source and bases shadows off of that. Both paintings use posing that was popular for the time. In Birth of Venus however, Venus is posed in a very awkward position that would be difficult to hold, not to mention she is balancing on the edge Off clamshell in water. In Reincarnation Wedding the two main subjects are posed with his right hand raised ND her holding her dress in front Of her abdomen. She gives the appearance of being pregnant but numerous art historians state that was a popular pose during the period indicating her desire to bear children. Botulisms work is more of a mythical fantasy whereas van Check is more of an everyday scene rich with symbolism. Many art scholars have debated on the meaning of these items but only van Check knows for sure, While both works are amazing to look at, they show a significant difference between the Northern Renaissance artists and the Italians.