Recreational applications

Carbon fiber/polymer matrix composites are extensively used in sporting goods and recreational applications. This is the second most important field of applications for carbon fibers. It has been largely responsible for the rapid growth of carbon fiber production during the last two decades and hence for the decrease in fiber prices [12-13]. 

Recreational Applications. Telescopes are far from just a tool for scientists, military personnel, or government officials. Durable, lightweight general-purpose optical telescopes known as spotting scopes... 

Polymer matrix composites combine the strength and impact resistance of polymers with the thermal conductivity fatigue and wear resistance of the whiskers. Whisker-reinforced polymers have strong potential to replace traditional plastics in automotive, aerospace and recreational applications. 

Single-element infrared and visible detector systems are used in a wide variety of industrial, medical, military, and recreational applications. Each application has requirements that will sway the design engineer toward a type or types of detector, electronics interface scheme, and product packaging. We describe here briefly representative applications, and the detector types chosen for that application... 

Composites. High molecular weight PPS can be combiaed with long (0.6 cm to continuous) fiber to produce advanced composite materials (131). Such materials having PPS as the polymer matrix have been developed by usiag a variety of reinforcements, including glass, carbon, and Kevlar fibers as mat, fabric, and unidirectional reinforcements. Thermoplastic composites based on PPS have found application ia the aircraft, aerospace, automotive, appliance, and recreation markets (see Composite materials, polymer-matrix). 

Other important application areas in both regions are household appliances, consumer electronic equipment, refrigerator sheeting, toys, telephones, office equipment, recreational equipment, luggage and as a modifier for PVC. 

Several large applications for one-component moisture-cure urethane adhesives are available. Polymeric MDI is an exceptional binder for wood products, such as oriented strand board and particleboard. One-component urethane windshield adhesives are used almost exclusively in both the OEM and automotive aftermarket. One-part urethane adhesives are used to assemble the sidewalls for recreational vehicles (RV s), manufactured housing, and mobile homes. In construction applications, one-part urethanes are used to bond metal doors, hardwood flooring, panels, and partitions. 

A variety of applications exist for liquid, 100% solid adhesives, (An adhesive is considered 100% solid if there is no solvent in the adhesive.) Some of the largest uses include structural wood adhesives and adhesives used for the transportation industry, such as windshield adhesives and those used for bonding composite sidewalls of a recreational vehicle (RV). Structural wood adhesives are often made of a polymeric MDI with functionality of approximately 2.7 or higher. Rigid assemblies often utilize polymeric MDI, whereas flexible adhesive assemblies will more often utilize pure MDI, a solid waxy material that melts at around 37°C, or a modified MDI , i.e., MDI that has been modified to make it a liquid at room temperature. Prepolymers are made with ratios of anywhere from NCO/OH = 1.6 to 3.0 or higher. 

Prepare and file the patent application documents. This document is called a specification. The specification must be clear enough so that anyone skilled in the subject matter of the invention could recreate your invention and use it. In the written portion of the specifications the inventor must slate the claims of the invention. These claims must show that the invention is novel and unobvious. Also, where applicable, illustrations must accompany the specification. There are filing fees for patent applications and if the application is successful there are maintenance fees to keep the patent in force. Literature describing patent applications and how they are to be submitted can be obtained from the Commissioner of Patents and Trademarks, Washington, D. C., 20231. This is also the address to submit properly prepared patent applications. 

Flexible foams are used in applications where a high degree of resiliency is required with moderate load-bearing capacity. Essentially all foam seating is urethane based, including the furniture and automotive markets. Other examples are packaging, textiles, filters, sports equipment, and recreational items. 

Bangor Naval Submarine Base, on the Hood Canal in the State of Washington, provides fine recreational facilities for service people stationed there, as well as for civilian employees. A proposal to divert runoff from munitions-contaminated areas towards the recreational fishing pond, Cattail Lake, led to a decision to identify hazard levels for the compounds of interest. In addition to trout, there was concern over contamination of bivalves, such as oysters, cockles, and clams, at the pond s outlet to Hood Canal. Bioconcentration factors (BCFs), assumed applicable for both fish and bivalves, were developed for three compounds (Table III). BCFs, together with Uj. values and worst-case levels of fish or bivalve consumption (0.4 kg/day) provided PPLVs for the pond water, according to the equation... 

The time period to use in estimating and grouping pollutant intake values is determined by the eventual application of the exposure results. Exposure medium intake rates may vary on a daily (e.g., for inhalation) or seasonal (e.g., for recreational dermal absorption) basis. If the variability has a significant influence... 

The connection between the optical properties and technological applications of macromolecules has been a subject of intense research and development for many years [1-5]. There is presently an emphasis on using materials and molecular architectures based on a very small size scale of less than 100s of nanometers [6-10], Revolutionary ideas and concepts have emerged which may lead to the creation of superior miniature size materials for a variety of applications. Some of these concepts are directed at synthetic schemes to recreate... 

A variety of cell culture systems for the modelling of the tracheo-bronchial epithelium are available. These include primary cultures and cell lines of human and animal origins, plus airway cells with characteristics of lung disease such as CF. The advantages and limitations of using a simple culture system compared to one that recreates to a greater extent the epithelial structure and function in vitro should be considered according to the pre-clinical application required. However, this choice is complicated by the lack of comparative data, both between the different cell systems and for in vitro-in vivo correlation, upon which to base such decisions. 

Ultimately, the cultivation, sale, and possession of cannabis is illegal at present in most places. Individuals who use it for whatever purpose in most areas carry the risk of arrest and prosecution. From the perspective of addictiveness, it seems inconsistent that cannabis use is prohibited, while the use of alcohol and nicotine are permitted. Apart from arguments about the recreational use of cannabis, resistance to its medical application is even more inconsistent. For example, the opioids carry some risk for dependence, but with medical supervision they are useful medications and their abuse is minimal (Joranson et al. 2000). Whether use of cannabis is to be permitted and for which purposes (medical or recreational) remains to be collectively decided by society and the legislators it appoints. 

Carbon fiber introduction into commercial markets happened in the mid-1960s and since then their application has increased substantially. Some of these applications include airplanes, spacecraft parts, compressed gas tanks, automotive parts, bridges, reinforced concrete, structural reinforcement, recreational sports equipment, and electrochemical systems [6,7]. 

Any discussion of the chemistry of drugs must include some consideration of the nonmedical applications of such compounds. Just as early humans were searching their environment for natural products that would assuage pain and cure disease, so were they also looking for plants and other natural materials with psychoactive effects, materials that would provide an escape from the problems and worries of everyday life, or that would just make a person feel better for a period of time. They also incorporated psychoactive drugs into many of their religious ceremonies. The use of the peyote cactus, magic mushrooms, and similar products dates back centuries, if not millennia, in a variety of cultures. One hardly need point out that the use of psychoactive chemicals for recreational purposes continues in essentially every part of the world today. 

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