Reasons why you need to explore the underwater world?

Scuba diving is a form of underwater diving in which a diver uses a scuba set to breathe underwater. Anyone who wants to learn more, who wants to satisfy their curiosity and who wants to have a once in a lifetime experience should definitely try scuba diving. Watching underwater creatures from Discovery Channel or National Geographic is a relaxing thing to do and one has the chance to see spectacular creatures but all of these emotions can be heightened when one is given the chance to visit the underwater world. Scuba diving trips are experiences you do not want to miss out on,  seeing the underwater environment will help inspire and enlighten individual on why the sea and the ocean have to be protected against environmental hazards such as oil spills and illegal fishing to name just a few. In the past scuba diving has been used as a means to obtain food or to retrieve precious gems from the underwater world. But since then societies have evolved and scuba diving has become a sport or a hobby that people can look into trying if they want to add excitement and thrill into their daily lives. It is said that people who go and have scuba diving feel a sense of peace while they are underwater,it is an incredible feeling. Aside from that they also get the chance to increase their knowledge and research when it comes to underwater creatures. Others can also try scuba diving for their treasure hunting expedition.

What are the other reasons to try scuba diving?

To earn respect and distinction – not everyone can become an experienced scuba diver and not everyone has the chance to brag about this opportunity. In order to be able to test out scuba diving a person has to learn the basics of scuba diving equipment, after that they have to enroll and get instructed then certified. The certification is not easy to get and it will cost money and patience as well as skill and dedication but it will be worth it. Scuba diving lessons will help you learn buoyancy skills and the instructors will teach you how to ways on how to cope underwater. They will also provide lectures regarding the diving environments and the possible creatures that you can encounter during the dive. Many schools will take the time to teach divers ways on how to help save aquatic life environment. Once a person learns to scuba dive and when they begin to see what it feels like underwater they will gain the chance to earn respect for aquatic life and would be more easily persuaded to campaign on ways on how to preserve the environment. The participation within the diving environment is necessary for a person to gain love and wisdom for marine and aquatic life.Scuba diving can also become a source of income for individuals, there are researchers, companies and treasure hunters who would be willing to give out wages for scuba diving expeditions. This will include civil engineering tasks like oil exploration as well as underwater welding and it pays to learn about this one of a kind skill, this can also be used for off-shore construction.

More and more people are falling in love with purchasing watercrafts. Most people like including water tour in their holiday preparations making them look forward to enjoyable times. Thus having a jet ski cover for your watercraft is very important. A personal water craft (PWC), also called water scooter, is a recreational watercraft that the rider rides or stands on, rather than inside of, as in a boat.[1] Thanks to advancement in technology, jet ski covers look more beautiful and are very important aspects of every watercraft. This is because they help in preventing sun rays from damaging the watercrafts paint and vinyl and the watercrafts decals. Jet ski cover also serves to protect the watercrafts from rain water and any other substances such as bird droppings that may damage the vessels. So how has science contributed to the advancement of the jet ski cover technology?

Thanks to advancement in technology, jet ski cover has been made lighter in weight. In the past, trying to install the jet ski cover on your watercraft would be close to impossible. This is because they were made of heavy weight equipments which were hard to carry around. However, thanks to technology, specialists have been able to come up with light weight jet skis which prove to be very efficient. Science and technology has also made it possible for the existence of jet ski covers which have a greater strength than the older ones. Our covers feature four 1.5″ webbing detachable tie downs, plus we ran shock cord bungee all around the bottom leading edge. For weather resistance, our materials are specially UV coated with the exclusive (CFM) material that is formulated only for Jettribe![2] This comes out as a paradox as the Jet Ski covers are lighter in weight while having greater strength than their older counterparts. These specific designs have also proven to be more durable making them a preferred choice for many people.

Another scientific development observed on the jet ski covers includes the complexity in the piston design. Knowing that the piston is a very important element as it is the point from where the horsepower is produced; having an efficient one greatly improves the competence of the watercraft. The advancements observed on the piston include, a stronger but lighter piston, efficient combustion and uninterrupted fuel and air flow. This has lead to various manufactures increasing the pistons production cycles and prototyping, making the jet ski cover piston mere flexible.

Science and technology has also led to the manufacture of high-strength aluminum jet ski cover parts. Aluminum is known to be one of the light weight metals available in the world. This means that any equipment made of aluminum will definitely be lighter thus making it more efficient and serving the purpose well. The Jet Ski cover parts therefore have greater strength thus they are more tolerant to extreme heat from the engines while being durable at the same time. The current Jet Ski covers also tend to be tight fitting thus they serve their purpose more effectively. These tight covers protect the watercraft from moisture that may find its way to the watercrafts surface or to the intake openings which destroy the air breather filters and carburetors, reducing the watercrafts efficiency. This shows that science and technology has proved to be very effective in the water world, as our watercrafts are more protected thus improving their durability.

Basics:

Recreation is an activity of leisure, leisure being discretionary time. The “need to do something for recreation” is an essential element of human biology and psychology. Recreational activities are often done for enjoyment, amusement, or pleasure and are considered to be “fun”. The term recreation implies participation to be healthy refreshing mind and body.
The Values and Benefits of Recreation for professionals are numerous. The charm lies in looking out something that’s works out best for you. There are different types of recreation and what value and benefit you derive from it depends upon your proactiveness to try them out and incorporate them as part of working routine. Let’s talk about 10 values and benefits that work out best and should encourage you to take recreational activities from time to time
1 ) Helps You Relax – Recreational activities help you relax and give soothing effect to your nerves. It helps you release the tension and maintain equilibrium. It is one of the best relaxation techniques to help you get back to work in full form.
2 ) Reduces Stress- Are you feeling stress lately. Do late hours sucks out the best in you. If tension is taking its toll on you then recreation activities are best for you.
3 ) Impacts Your Health- Recreational activities have a very good impact on your health. It is an excellent medicine for ailments which cannot be cured by any other manner. It is a natural way to stay fit and healthy in life.
4 ) Social Benefits- It helps you meet like minded people and develop a favorable rapport. People who share common interest makes a joyful group that help each other to promote themselves. Importance of recreation gets reflected in the status you build for yourself.
5 ) Refresh the Senses- Feeling dumb? Recreation is the important and best activity to refresh you senses and prepare you for the next battle. It rejuvenates your senses and makes you feel light again.
6 ) Refills the Energy- Recreation activities are best mechanism to refill your energy and make you feel alive again. It is best way to charge you up when you feel exhausted and drained out.
7 ) Quality of Life- Recreational activities help you build self esteem and confidence. It helps you enhance the quality of life by building a positive self image.
8 ) Effective Time Utilization- When your body is at the best of its form both in terms of health and energy, recreational activities helps you utilize your time effectively. The effort you put in a certain task is way below what you could have possibly put without any recreational activity.
9 ) Sharpen Skills- The value and benefit of recreational activities is best seen in the form of skills that gets developed and sharpened over the period of time. You not only are inclined to learn more things but are also motivated to be at your best.
10) New Avenues- It has happened to people and it can help you too. People who enjoy it to the best of its form have developed a career in one form or the other.
Investigated the role of recreation satisfaction on life satisfaction using 78 male and 132 female retired persons (aged 60–94 yrs). Ss completed the Leisure Activities Blank, a leisure satisfaction scale, and a self-exploration questionnaire. Results indicate that frequency of participation in recreation activities had no significant positive relationship to life satisfaction in retirement. Satisfaction with recreation activities showed a significant and positive relationship with life satisfaction even when compared with the variables of gender, age, marital status, annual income, self-rated health, religiosity, retirement choice, and mobility. It is suggested that recreation program planners who serve older participants should assess the activity as well as the potential for satisfaction in programs.
This paper proposes that recreation resource managers need to give more attention to the benefits that a person derives from participation in recreation activities. Behavioral information is described as one of several types of knowledge needed in recreation planning and management decisions. A model outlining the dynamics of a recreationist’s behavior is presented. Within that model sequences of specific types of recreation behavior are traced from: deciding on a particular recreation activity, planning and preparation, on-site engagement, recall, realizing satisfying experiences, to gaining the ultimate benefits these experiences can produce. Personal and social benefits of recreation participation are defined as the ways in which an individual functions or performs more effectively because of his having participated in a recreation activity. The importance to recreation resource management of information on these benefits is described as is the state of knowledge for identifying and measuring them. Throughout, the need for additional research is emphasized.
This study examines the interrelationships among recreation and other life circumstance variables and quality of life. LISREL, a causal analysis technique, was used to test a theoretical model based on previous gerontological research. Results indicate that the variables of sex, education, religiosity, marital status, and age are significantly related to income, health, recreation activity participation, and recreation satisfaction. However these variables do not significantly influence quality of life directly. The only significant, direct predictor of quality of life is satisfaction with recreation.

Conclusion:

Recreation feels like a rain shower during scorching heat. Recreation is the time to be together with your friends and family and to have fun. Devoting some time for recreation helps in staying healthy and achieving a peace of mind. Recreational activities serve as a way of relaxaxing and as researches have shown recreation on a daily basis reduces risks of diabetes and hypertension and it improves mental and physical health and improves the quality of life.

References:

[1] http://en.wikipedia.org/wiki/Recreation
[2]http://www.brazencareerist.com/2009/12/23/importance-of-recreation-10-values-and-benefits-for-professionals
[3] ”The importance of recreation satisfaction and activity participation to the life satisfaction of age-segregated retirees.” by: Russell, Ruth V.
[4] ”Toward a better understanding of the social benefits of outdoor recreation participation” by: Driver, B. L.
[5] ”Recreation and Quality of Life in Old Age: A Causal Analysis” by: Ruth V. Russell

Basics:

The body mass index (BMI), or Quetelet index, is a heuristic proxy for human body fat based on an individual’s weight and height. BMI does not actually measure the percentage of body fat. It was invented between 1830 and 1850 by the Belgian polymath Adolphe Quetelet during the course of developing “social physics”. Body mass index is defined as the individual’s body weight divided by the square of his or her height. The formulae universally used in medicine produce a unit of measure of kg/m2. BMI can also be determined using a BMI chart, which displays BMI as a function of weight (horizontal axis) and height (vertical axis) using contour lines for different values of BMI or colors for different BMI categories. [1]

The influence of body weight on the performance in cross-country skiing has been studied by: (i) dimensional analysis of the ratio (R) between the factors of importance to power production ([latin capital V with dot above]O2max, acceleration of gravity) and the braking powers, e.g., friction and air resistance; (ii) measuring the energy cost of level skiing (N = 6); (iii) comparing male world class skiers (N= 5) with less successful ones (N = 34) and female winners of the National Championships (N = 9) with non-winners (N = 9) in regard to the relationship between body weight and [latin capital V with dot above]O2max, The dimensional analysis revealed that R was less than unity for rather steep uphills. For level, downhill, and less steep uphill skiing, R was greater than unity. Thus, skiers who are light will be favored in steep uphill slopes, whereas heavier skiers have advantages in the other parts of the track. Energy cost per kilogram for level skiing was inversely related to the transported mass. Per unit of distance, this cost was positively related to velocity. The world class skiers displayed significantly greater [latin capital V with dot above]O2max, than the less successful ones, regardless of the unit used. The lowest standard deviation among the world class skiers was attained when expressing [latin capital V with dot above]O2max as ml-min-1 [middle dot] kg-2/3. The present results indicate that R will be quite close to unity and therefore the performance capability would theoretically be independent of body mass. Furthermore, [latin capital V with dot above]O2max is preferably expressed as ml [middle dot] min-1 [middle dot] kg-2/3 for cross-country skiers. [2]
Basal metabolic rate is scaled to body mass to the power of 0.73, and we evaluated whether a similar scaling applies when the O2 transport capacity of the body is challenged during maximal exercise (i.e. at maximal O2 uptake, V˙O 2max). The allometric relationship between V˙O 2max and body mass (y=a • x b, where y is V˙O 2max and x is body mass) was developed for 967 athletes representing 25 different sports, with up to 157 participants in each sport. With an increasing number of observations, the exponent approached 0.73, while for ventilation the exponent was only 0.55. By using the 0.73 exponent for V˙O 2max, the highest value [mean (SD)] for the males was obtained for the runners and cyclists [234 (16) ml • kg−0.73 • min−1], and for the females the highest value was found for the runners [189 (14) ml • kg−0.73 • min−1]. For the females, aerobic power was about 80% of the value achieved by the males. Scaling may help both in understanding variation in aerobic power and in defining the physiological limitations of work capacity. [3]
In addition to factors such as fat free mass, hormonal status, genetics and energy balance, previous physical activity has been shown to influence energy turnover during resting (RMR = resting metabolic rate) or basal conditions(BMR = basal metabolic rate). This article presents data on BMR from elite endurance athletes (4 female and 4 male), at least 39 h after their last training session, in comparison with sedentary nonathletic controls matched for sex and fat free mass (FFM). Comparisons with theoretical calculations of BMR were also made. The athletes were shown to have a significantly higher BMR than was expected from calculations based on body mass (16%, P < 0.05) or body composition (12%, P < 0.05). There were no corresponding differences found in the nonathletic control group. The athletes had a 13% higher (P < 0.001) BMR than controls if related to FFM and 16% (P = 0.001) if related to both FFM and fat mass (FM). The athletes were also found to have 10% lower R-values (P < 0.01) indicating higher fat oxidation. The conformity of these findings with the present literature and the possible mechanisms behind them as well as its influence on theoretical calculations of energy turnover (ET) based on activity factors expressed as multiples of RMR are further discussed. [4]
Many contemporary world class ski jumpers are alarmingly underweight and several cases of anorexia nervosa have come to light. Athletes strive for low body weight because it gives them a major competitive advantage. In order to stop this hazardous development, changes to the regulations are being discussed, and the International Ski Federation and the International Olympic Committee wish to be proactive in safe guarding the interest of the athletes and their health.
This study of ski jumping uses field studies conducted during World Cup competitions, large-scale wind tunnel measurements with 1:1 models of ski jumpers in current equipment and highly accurate computer simulations of the flight phase that include the effects due to the athlete’s position changes.
Particular attention has been directed to the design of a reference jump that mirrors current flight style and equipment regulations (2001), and to the investigation of effects associated with variation in body mass, air density, and wind gusts during the simulated flight. The detailed analysis of the physics of ski jumping described here can be used for the investigation of all initial value and parameter variations that determine the flight path of a ski jumper and will form a reliable basis for setting regulations that will make it less attractive or even disadvantageous for the athlete to be extremely light.[5]

References:

[1] http://en.wikipedia.org/wiki/Body_mass_index
[2] ‘The influence of body mass in cross-country skiing’ by BERGH, ULF
[3] ‘Influence of body mass on maximal oxygen uptake: effect of sample size’ by: Kurt Jensen, Lars Johansen and Niels H. Secher
[4] ‘The influence of physical activity on BMR’ by SJÖDIN, ANDERS M.; FORSLUND, ANDERS H.; WESTERTERP, KLAAS R.; ANDERSSON, AGNETA B.; FORSLUND, JEANETTE M.; HAMBRÆUS, LEIF M.
[5] ‘The importance of being light: aerodynamic forces and weight in ski jumping’ by B Schmölzer and W Müller