Aids In Africa Essays (2395 words) - Pandemics, HIVAIDS,

Aids In Africa As recently as 1990, there were some regions of the world that had remained relatively unscathed by AIDS. Today, however, there is not a single country around the world which has wholly escaped the AIDS epidemic. As the epidemic has matured, some of the developed nations which were hard hit by the epidemic in the 1980s such as the United States have reported a slowing in the rate of new infections and a stabilization among existing cases with lower mortality rates and an extension of post-diagnosis lifespan. However, despite the changing face of the global AIDS pandemic, one factor remains unchanged: no region of the world bears a higher AIDS-related burden than sub-Saharan Africa. This paper examines the demographic effects of AIDS in Africa, focusing on the hardest-hit countries of sub-Saharan Africa and considers the present and future impact of the AIDS epidemic on major demographic measures such as fertility, mortality, life expectancy, gender, age, and family structure. Although the sub-Saharan region accounts for just 10% of the worlds population, 67% (22.5 million) of the 33.4 million people living with HIV/AIDS in 1998 were residents of one of the 34 countries of sub-Saharan Africa, and of all AIDS deaths since the epidemic started, 83% have occurred in sub-Saharan Africa (Gilks, 1999, p. 180). Among children under age 15 living with HIV/AIDS, 90% live in sub-Saharan Africa as do 95% of all AIDS orphans. In several of the 34 sub-Saharan nations, 1 out of every 4 adults is HIV-positive (UNAIDS, 1998, p. 1). Taxing low-income countries with health care systems inadequate to handle the burden of non-AIDS related illnesses, AIDS has devastated many of the sub-Saharan African economies. The impact of AIDS on the region is such that it is now affecting demographics - changing mortality and fertility rates, reducing lifespan, and ultimately affecting population growth. Although Africa is the region of the world hardest hit by AIDS, and although no country has entirely escaped the virus, prevalence rates vary dramatically between regions, countries, and even within countries. In general, the southern region is the most affected, with Botswana, Namibia, Swaziland and Zimbabwe showing the highest rates, while West Africa has been less affected. In almost all countries, the HIV/AIDS prevalence rate is significantly higher in urban areas than in rural areas. Within the general population, the highest prevalence rates are found among the sexually active adult (15 to 49 years old) population. Women tend to get infected at earlier ages than males for a variety of biological and sociocultural reasons. In recent years an intensive government-sponsored HIV prevention campaign focusing on use of condoms and changes in sexual behavior has produced impressive results. Researchers however, have yet to satisfactorily explain the broad variation in HIV seroprevalence between Western and Eastern sub-Saharan Africa. As Gilks (1999) observes, in some of the countries of Western Africa such as Senegal, low levels of HIV prevalence in adults have been maintained for about a decade, despite many circumstances highly conducive to appreciable and sustained transmission (p. 181). In some Western African nations, early and sustained prevention programs may be responsible for the differences, although other reports indicate that comparatively low transmission rates prevail in most of the Western countries regardless of programs designed to encourage safer sex (UNAIDS, 1998, p. 2). Reports also show that differences in the rate of HIV spread between East and West Africa cannot be explained by differe nces in sexual behavior alone. AIDS researchers typically make a distinction between concentrated and generalized transmission patterns of the virus. In a concentrated transmission pattern, infection tends to be concentrated within vulnerable groups such as homosexual men, prostitutes, and IV drug users. In the generalized pattern, infection is diffused broadly through the population, typically by means of heterosexual transmission. In sub-Saharan Africa, where heterosexual transmission predominates, the pattern is that of generalized transmission. Compared to the U.S. little HIV transmission in Africa is related to IV drug use or unprotected homosexual sex. In addition to heterosexual transmission, transmission via transfusion and through contaminated medical equipment is not uncommon in sub-Saharan Africa. Africans infected with HIV die much sooner after diagnosis than HIV-infected persons in other parts of the world. Studies in industrialized countries that

Bristol Beaufighter in World War II

Bristol Beaufighter in World War II General Specifications: Length:  41  ft., 4  in.Wingspan:  57  ft., 10  in.Height:  15  ft., 10  in.Wing Area:  503  sq. ft.Empty Weight:  15,592  lbs.Max Takeoff Weight:  25,400  lbs.Crew:  2 Performance: Maximum Speed:  320  mphRange:  1,750  milesService Ceiling:  19,000  ft.Power Plant:  Ã‚  2 Ãâ€"  Bristol Hercules  14-cylinder  radial engines, 1,600 hp each Armament: 4 Ãâ€" 20 mm  Hispano Mk III cannon4 Ãâ€" .303 in.  Browning machine guns  (outer starboard wing)2 Ãâ€" .303 in.  machine gun (outer port wing)8 Ãâ€"  RP-3 rockets  or  2Ãâ€" 1,000 lb.  bombs Design and Development In 1938, Bristol Aeroplane Company approached the Air Ministry with a proposal for a twin-engine, cannon-armed heavy fighter based on its Beaufort torpedo bomber which was then entering production.  Intrigued by this offer due to development problems with the Westland Whirlwind, the Air Ministry asked Bristol to pursue design of a new aircraft armed with four cannons.  To make this request official, Specification F.11/37 was issued calling for a twin-engine, two-seat, day/night fighter/ground support aircraft.  It was expected that the design and development process would be expedited as the fighter would utilize many of the Beauforts features. While the Beauforts performance was adequate for a torpedo bomber, Bristol recognized the need for improvement if the aircraft was to serve as a fighter.  As a result, the Beauforts Taurus engines were removed and replaced with the more powerful Hercules model.  Though the Beauforts aft fuselage section, control surfaces, wings, and landing gear were retained, the forward parts of the fuselage were heavily redesigned.  This was due to the need to mount the Hercules engines on longer, more flexible struts which shifted the aircrafts center of gravity.  To rectify this issue, the forward fuselage was shortened.  This proved a simple fix as the Beauforts bomb bay was eliminated as was the bombardiers seat.   Dubbed the Beaufighter, the new aircraft mounted four 20  mm Hispano Mk III cannons in the lower fuselage and six  .303 in. Browning machine guns in the wings.  Due to the location of the landing light, the machines guns were situated with four in the starboard wing and two in the port.  Using a two-man crew, the Beaufighter placed the pilot forward while a navigator/radar operator sat further aft.  Construction of a prototype commenced by using parts from an unfinished Beaufort.  Though it was expected that the prototype could be built quickly, the necessary redesign of the forward fuselage led to delays.  As a result, the first Beaufighter flew on July 17, 1939. Production Pleased with the initial design, the Air Ministry ordered 300 Beaufighters two weeks before the prototypes maiden flight.  Though a bit heavy and slower than hoped, the design was available for production when Britain entered World War II that September.  With the beginning of hostilities, orders for the Beaufighter increased, which led to a shortage of Hercules engines.  As a result, experiments began in February 1940 to equip the aircraft with the Rolls-Royce Merlin.  This proved successful and the techniques employed were used when the Merlin was installed on the Avro Lancaster.  During the course of the war, 5,928 Beaufighters were constructed at plants in Britain and Australia. During its production run, the Beaufighter moved through numerous marks and variants.  These generally saw alterations to the types power plant, armament, and equipment.  Of these, the TF Mark X proved the most numerous at 2,231 built.  Equipped to carry torpedoes in addition to its regular armament, the TF Mk X earned the nickname Torbeau and was also capable of carrying RP-3 rockets.  Other marks were specially-equipped for night fighting or ground attack. Operational History  Ã‚  Ã‚  Ã‚  Ã‚   Entering service September 1940, the Beaufighter quickly became the Royal Air Forces most effective night fighter.  Though not intended for this role, its arrival coincided with the development of airborne interception radar sets.  Mounted in the Beaufighters large fuselage, this equipment allowed the aircraft to provide a solid defense against German night bombing raids in 1941.  Like the German Messerschmitt Bf 110, the Beaufighter unintentionally remained in the night fighter role for much of the war and was used by both the RAF and US Army Air Forces.  In the RAF, it was later replaced by radar-equipped De Havilland Mosquitoes while the USAAF later supplanted Beaufighter night fighters with the Northrop P-61 Black Widow. Used in all theaters by Allied forces, the Beaufighter quickly proved adept at conducting low-level strike and anti-shipping missions.  As a result, it was widely employed by Coastal Command to attack German and Italian shipping.  Working in concert, Beaufighters would strafe enemy ships with their cannons and guns to suppress anti-aircraft fire while torpedo-equipped aircraft would strike from low altitude.  The aircraft fulfilled a similar role in the Pacific and, while operating in conjunction with American A-20 Bostons and B-25 Mitchells, played a key role in the Battle of the Bismarck Sea in March 1943.  Renowned for its ruggedness and reliability, the Beaufighter remained in use by Allied forces through the end of the war. Retained after the conflict, some RAF Beaufighters saw brief service in the Greek Civil War in 1946 while many were converted for use as target tugs.  The last aircraft left RAF service in 1960.  During the course of its career, the Beaufighter flew in the air forces of numerous countries including Australia, Canada, Israel, Dominican Republic, Norway, Portugal, and South Africa.