![]() I plugged this Fac equality into equation 2, to get Fad alone. I then rearranged equation 1 to get Fac in terms of Fad. I have a complete solution, but apparently it's not the right answer according to the teacher assistant (I don't know what the right answer is).Īnd I get that vector Fab = (142.85i + 214.285j - 428.55k)Nįac = (-0.2308(Fac)i + 0.30769(Fac)j - 0.923076(Fac)k)N (where the Fac's on the right side of the equation represent the magnitude of the force *vector* Fac)įad = (-0.333(Fad)i - 0.666(Fad)j - 0.666(Fad)k)N If cable AB is subjected to a tension of 500N, determine the tension in cables AC and AD and the vertical force F which the mast exerts along its axis on the collar at A.įor this assignment, I'm pretty sure the prof just wants us to consider sum of Fx, Fy and Fz, and to take no moments. ![]() This was completed to evaluate the ability to desorb protein from the nanofiber surface, and also to ensure that any adsorption occurring was done through ionic mechanisms and not hydrophobic interactions.The mast OA is supported by 3 cables. The liquid solution was then analyzed for protein concentration. Following adsorption studies, 1 M NaCl was added to the rinsed fibers and allowed to mix for a minimum of 24 h. For samples using a nonionic surfactant of Triton X-305, the critical micelle concentration of 1920 ppm was adopted. For lysozyme concentration, both as a pure protein and in the mixture with BSA, a standard activity assay was used. The BSA concentration was measured by UV absorbance for the pure protein experiments (no BSA concentration was measured in the liquid). Thereafter, both the initial and the final protein concentrations of each sample were measured and the difference represented the protein adsorbed to the nanofiber mat. These pieces were then added to each of the protein solutions and allowed to mix for 48 h. Then, the nanofiber mat (that was evaluated) was cut into ∼5-mm 2 pieces and weighed to obtain ∼250 mg of the material (the exact mass was recorded). ![]() Later, a mixture of lysozyme and BSA was also made with each protein at 0.1–1.2 mg/mL (i.e., BSA and lysozyme were each at 0.1 mg/mL in one solution, each at 0.2 mg/mL, etc.). The concentration of the protein was in the range from 0.1 to 1.2 mg/mL. Initially, either lysozyme (as a positively charged model protein at the pH value of 7.5) or BSA (as a negatively charged model protein at the pH value of 7.5) was dissolved into 14 mL of 50 mM sodium phosphate buffer in a 15-mL Corning centrifuge tube (Fisher Scientific). In all cases the same procedure was followed. Menkhaus, Hao Fong, in Electrospinning: Nanofabrication and Applications, 2019 16.3.1.6 Static Adsorption/Desorption EvaluationĮquilibrium static adsorption measurements were performed with the (treated and untreated) carbon nanofiber mats. In the second part, the semi-empirical approach presented by González and Medina (1999) predicting the shoreline response behind an offshore breakwater is described. This methodology has been applied to some natural and man-made beach cases, showing the capability for the design of new nourishment projects. The proposed methodology includes existing equilibrium profile models and a modified static equilibrium plan form formulation. It is based on the equilibrium beach concept (combining shoreline and cross-shore profile) and a semiempirical model. In the first part, the methodology proposed by González and Medina (2001) for testing or designing «static equilibrium beaches» is presented. Noble, (1978) Gourlay, (1980) Nir, (1982) Dally and Pope, (1986) Suh and Dalrymple, (1987) Hsu and Silvester, (1990) Ahrens and Cox, (1990) McCormick, (1993) González and Medina, (2001) and on small-scale models and field observations, see Rosati, (1990), and ASCE, (1994), as general references. Empirical analyses have been carried out by a number of researchers based on beach equilibrium concepts, e.g. ![]() The empirical approach requires an a priori assumption of the shape of the shoreline. One of the main problems in the design of these coastal structures is the prediction of the shoreline response. Offshore breakwaters are generally shore-parallel structures that effectively reduce the amount of wave energy reaching a protected stretch of shoreline. Static equilibrium shoreline models, are used to predict tombolo and salient formations for both natural and man-made coastal structures. Alberto Lamberti, in Environmental Design Guidelines for Low Crested Coastal Structures, 2007 13.9.1.
0 Comments
Leave a Reply. |