THE EFFECT OF STRING TENSION ON SHUTTLECOCK VELOCITY

Badminton players currently lack of knowledge and understanding about the effect of tension on hitting performance. This study aimed to investigate the effect of string tension on shuttlecock velocity. The experiments were performed by stringing 5 racquets with automatic machine and assigned pull tension at 22, 24, 26, 28 and 30 lbs/ft2, respectively. The racquets were set up in the system with motor speed adjusted at 450 rpm. Then, each racquet was conducted to hit 10 times and capture with 2 high speed cameras at 2,000 frame/sec. Five screenings were made as to search a perfect hitting to analyze shuttlecock speed. The statistic comparison uses one way-ANOVA and repeated measure. The result shows that shuttlecock velocity depends on string tension, that is, lower tension generates more shuttlecock velocity than high tension (22>24>26>28>30). Therefore, badminton players should be have an understanding and modify their stringing behavior to suit each individual

Adsorption of Free Fatty Acid from Crude Palm Oil on Magnesium Silicate Derived from Rice Husk

Magnesium silicate with various silica and magnesium oxide ratios (SiO2/MgO ratios) was used as the adsorbent for a study of adsorption of free fatty acid (FFA) in crude palm oil (CPO). Magnesium silicate was prepared from magnesium nitrate or magnesium sulfate solution precipitated with a solution of sodium silicate derived from rice husk. SiO2/MgO ratios of the magnesium silicate synthesized from magnesium nitrate and magnesium sulfate were 3.93, 3.75, 2.74, 2.40, 1.99 and 3.96, 3.61, 3.51, 2.91, 2.69, respectively. FFA adsorption on the magnesium silicate was carried out by adding 1 gram of the adsorbent to 50 grams of CPO and shaking for 1 hour at 50oC. It was found that SiO2/MgO ratio of 1.99 had the highest adsorption capacities of 185 mg of FFA per gram of adsorbent. In addition, increasing of SiO2/MgO ratios of magnesium silicate was found to reduce the adsorption capacities due to decreasing of FFA chemisorption. The effect of dosage amount to equilibrium adsorption capacities were carried out by adding different amount of magnesium silicate (SiO2/MgO ratio of 1.99) to 50 grams of CPO. The result showed that efficiency decreased when dosage increased. The Fruendlich and Langmuir isotherm were applied to describe this absorption system. The values of maximum sorption capacity (Q0) and Langmuir's sorption affinity (b) in the Langmuir equation obtained by linear-regression were minus values which were physically meanigless. Thus, FFA adsorption on magnesium silicate was both physisorption and chemisorption and well represented by the Fruenlich isotherm

Acute effect of Kineslo Taping on Knee Joint Blornechanics during Drop Vertical Jump In Anterlor Cruclate ligament-Deflcient Knee

Kinesio tape (KT), an elastic therapeutic tape, is useful for prevention and treatment of sport injury, but their efficacies remain unclear on mechanical change. The purpose of this study was to analyze the acute effect of KT on knee joint biomechanics during drop vertical jump in individuals with ACL injuries. Seven participants with partial ACL tears performed drop vertical jump (DVJ) with and without ACL KT taping technique. Peak knee joint angles and moments, and knee joint angle at initial contact were obtained from 3D motion analysis system. Paired t-test did not reveal significant differences of knee joint biomechanics between the 2 conditions. In conclusion, KT did not produce any biomechanical change in participants with partial ACL tears

Report on Preliminary Training Need Assessment.

Training need assessment is one of RFU-SEAFDEC responsible provide for REBYC-II CTI executing countries in order to ensure the project will meet with objectives. Identification of the needs of executive countries, RFU-SEAFDEC carries out the training needs assessments for two (2) groups of NTEP staffs, i.e. 1) Fishers and other relevant stakeholders including government officials and 2) Private sector/fisher champions. The target for TNA no. 1 is a general training focusing on sustainability coupled institutional issues (i.e. why bycatch reduction is necessary and beneficial, and how it may be implemented). For TNA no. 2 the focus is on the technical options to achieve more sustainable trawl fisheries (i.e. how bycatch reduction can be achieved through technological change or other management measures, but will also include institutional issues). To institute change it is necessary to ensure that policy and decision makers are made aware of the benefits of, and approaches to bycatch reduction. SEAFDEC will actively look for opportunities to sensitize high-level officials to the outcomes of the project. This may be through the projects regular activities and in cooperation with partners, e.g. the fishing industry and NGO’s and project partners

LOWER EXTREMITY STIFFNESS DURING SEPAKTAKRAW SPIKE LANDINGS

Sepaktakraw spike landing is the aggressive skill that leads to many injury of lower extremity. Leg and knee joint stiffness is the important factor of sepaktakraw spike injury particularly when landing. The purpose of this study was to investigate lower extremity stiffness of sepaktakraw spike landings. Results showed that leg stiffness and knee joint stiffness of roll spike (RS) during landing was significant higher than half roll spike (HRS). These indicate that RS can -use a high risk of injury due to greater lower extremity stiffness than HRS. Thus sepaktakraw players need to have a good strength and flexibility of muscle to prevent potential risk of lower extremity injury during sepaktakraw spike landings

TAEKWONDO BACK KICK KINEMATICS OF ELITE AND YOUTH ATHLETES

The purpose of this study was to analyze taekwondo back kick kinematics of elite and youth athletes. The athletes were instructed to perform basic back kick ats the target with their dominant leg. 3D motion analysis system was captured three back kicks at the sampling rate of 100 Hz. Response time was also recorded. The Mann-Whitney U test did not reveal significant differences of selected kinematics and temporal variables of back kick between two groups. Both athlete groups show similar kicking pattern. Peak linear velocity occurs prior to the impact. Peak kicking velocity should occur near the impact. Nevertheless, this study only investigated static simple back kick. Future research should investigate different types of back kick

Development of Eco-efficiency Indicators for Rubber Glove Product by Material Flow Analysis

AbstractRubber glove product Thailand shows the trend of higher growth. Currently, the average export value of rubber glove product is 826.72 US$/year. Thus, the development guideline of this product for Thailand should be concerned. However, rubber glove process caused the environmental and human impacts. Hence, the eco-efficiency concept of rubber glove product was interested. Initial important step of eco-efficiency concept was indicator development. Therefore, this research developed the eco efficiency indicators including economic and environmental indicators of rubber glove product based on the eco-efficiency theory and material flow analysis. The result showed that economic indicators consisted of quantity product and net sale and environmental indicators consisted of material consumption, energy consumption, water consumption, wastewater production, solid waste production, greenhouse gas emission, were selected to eco-efficiency indicators based on eco-efficiency theory and material flow analysis. These eco-efficiency indicators would help to discover more economic and effective ways to improve productivity process and to enhance recyclability or reducing energy and material intensity