Dynamic response analysis of an offshore wind turbine supported by a moored semi-submersible platform

textWind energy, the fastest growing source of renewable energy, is a promising resource for power generation. Offshore wind energy, in particular,offers favorable conditions for power generation—high winds with low turbulence, minimal visual impacts and high generation capacities. Offshore wind turbines mounted on floating platforms are the most economical and viable solution for deep water sites. A semi-submersible platform is an appropriate floating platform for a deep water site, providing stability through high water-plane area. In the wind energy industry, there has been continuing interest in developing larger turbines. At Sandia National Laboratories (SNL), efforts have led to the development of a 13.2 MW wind turbine model with blades 100 meters in length, significantly larger than commercially available blades at present. Such a large wind turbine needs to be carefully analyzed and studied before it can be considered suitable for commercial purposes. The dynamic analysis of the SNL 13.2 MW wind turbine mounted on a moored semi-submersible platform is the subject of this study. This integrated 13.2 MW wind turbine system has been developed and its various physical properties have been studied in this and another associated study. The semi-submersible platform is developed using various modeling tools. For the wind turbine-platform system model developed, dynamic analyses are performed using simulation tools to understand the coupled behavior of the wind turbine and the platform. A reference site is chosen to define the environmental conditions, based on which the short-term extreme response of the offshore wind turbine is estimated. The system is loaded with selected combinations of winds and waves to assess controlling combinations of wind speeds and wave heights that influence the response. The influence of changes in model parameters on overall response is also studied.Civil, Architectural, and Environmental Engineerin

Flare: Architecture for rapid and easy development of Internet-based Applications

We propose an architecture, Flare, that is a structured and easy way to develop applications rapidly, in a multitude of languages, which make use of online storage of data and management of users. The architecture eliminates the need for server-side programming in most cases, creation and management of online database storage servers, re-creation of user management schemes and writing a lot of unnecessary code for accessing different web-based services using their APIs. A Web API provides a common API for various web-based services like Blogger [2], Wordpress, MSN Live, Facebook [3] etc. Access Libraries provided for major programming languages and platforms make it easy to develop applications using the Flare Web Service. We demonstrate a simple micro-blogging service developed using these APIs in two modes: a graphical browser-based mode, and a command-line mode in C++, which provide two different interfaces to the same account and data.Comment: 4 pages, 5 figure

An Efficient Vein Pattern-based Recognition System

This paper presents an efficient human recognition system based on vein pattern from the palma dorsa. A new absorption based technique has been proposed to collect good quality images with the help of a low cost camera and light source. The system automatically detects the region of interest from the image and does the necessary preprocessing to extract features. A Euclidean Distance based matching technique has been used for making the decision. It has been tested on a data set of 1750 image samples collected from 341 individuals. The accuracy of the verification system is found to be 99.26% with false rejection rate (FRR) of 0.03%.Comment: IEEE Publication format, International Journal of Computer Science and Information Security, IJCSIS, Vol. 8 No. 1, April 2010, USA. ISSN 1947 5500, http://sites.google.com/site/ijcsis

Novel dual peptisers and curing agents derived from PET waste as N-alkyl benzene dicarboxamides for EDPM waste

149-152Ethylene-propylene-diene monomer (EPDM) is widely used in the manufacturing of various components in rubber industries and hence recycling of scrap rubber is a major problem. In the present study, EPDM rubber waste powder has been recycled successfully by using N-alkyl benzene dicarboxamides, derived from PET wasteand other additives. Three aminolysed end products namely 1,4-benzene dicarboxamide, 1,4-benzene dicarbohydrazide and N,N′‐diaminoethyl 1,4‐benzene dicarboxamidewere used as peptisers and curing agents in the EPDM waste formulations. EPDM rubber waste sheets have been prepared at comparatively low temperature using two roll mill and compression moulding machine. Tensile strength, % elongation and hardness have been found in the range 12.23-20.19 kg/cm2, 107-145 % and 46-61, respectively. It has been expected that the developed reclaimed process described in this paper will promisingly support the protection of environment and conservation of resources with favors to rubber waste generated throughout the world

Improvement of Thermal Insulation and Crack Resistance of Plaster of Paris Composites at High Temperature

344–347In the present work, silica gel is extracted from raw rice husk, incorporated in Plaster of Paris formulations and casted into sheets of varying thicknesses. The sheets were tested for thermal insulation at 60, 100, 150 & 200 °C and compared with blank formulations. Plaster of Paris composites with silica gel have shown remarkable increase in thermal insulation properties and crack resistance. Thermally insulated Plaster of Paris composites with excellent crack resistance have been developed which can be used competently for prolonged times even at high temperatures offering better serviceability and safety to the buildings

Treatment of clavicle fracture using wise lock clavicle hook plate and wise lock superior anterior clavicle plate

Background: Clavicle fracture is common in adults associated with high non-union rate and post-operative complications. The aim of this prospective study was to reduce the postoperative complications in clavicle fracture (Type 15-A2 and 15-B1) by using wise lock plates (manufactured by Auxein Medical Private Limited).Methods: In this prospective study of 25 patients (11 patients had 15-A2 fracture, 14 patients had 15-B1 fracture) recruited with one year follows up period followed by physical exercises after one month of the surgery. The fractures were treated with two different plates: 3.5 mm wise lock clavicle hook plate and 3.5 mm wise lock superior anterior clavicle plate. X-ray was used to check the union, non-union. Functional outcome of the patients were assessed by the visual analogue scale (VAS) score at post-operative follow up at 4 weeks, 12 weeks, 6 months and 1 year.Results: Postoperative outcome was good with none of the patients showing non-union or delay in the union of fracture site. The encountered complication registered were residual pain which was mild (4 cases), and hypoesthesia (2 cases).Conclusions: Osteosynthesis of clavicle fracture with 3.5 mm diameter locking plates attributed as superior, anterior and hook plating system showed excellent results with low rate of complications

Pharmacokinetic and pharmacodynamic evaluation of a single dose of new, first in world, high dose aqueous formulation versus conventional oil based preparation of cholecalciferol

Background: Vitamin D deficiency (VDD) is a common condition in India with prevalence in general population varying from 50-94%. VDD has been associated with increased susceptibility to a wide range of viral infections including COVID-19. It is associated with worse outcomes and greater morbidity and mortality in medical as well as surgical ICUs. The objective of the study was to evaluate the pharmacokinetic (PK)/pharmacodynamic (PD) of aqueous cholecalciferol injection in comparison with conventional oil-based injection in VDD healthy adult subjects. Methods: 24 eligible vitamin D deficient healthy adult males, fulfilling the inclusion/exclusion criteria, were enrolled in the study. Subjects received a single dose of either test (T) [Aqueous cholecalciferol injection 600K IU/2 mL] or reference (R) [Cholecalciferol 600K IU oil-based injection] intramuscularly. Various PK parameters (Cmax, AUC0-t, AUC0-∞ and Tmax) and PD parameters (concentration of cholecalciferol and 25(OH)D) were measured along with safety analysis. Results: A significantly higher concentration of cholecalciferol and 25(OH)D were observed with test product compared to reference (p<0.01) from 1-hour post-administration till end of the study. A statistically significant difference between test and reference product was observed for the calculated Cmax and Tmax for cholecalciferol and 25(OH)D (p<0.0001). All 12 (100%) subject in test arm achieved the normal level of 25(OH)D by 72 hr post-administration as compared to none in reference arm (p=0.0017). There were no serious adverse events (SAEs) or deaths reported during the study. Conclusions: This first in world, aqueous formulation of cholecalciferol injection was found to be superior in various PK/PD parameters as compared to conventional oil based injection, which resulted in rapid and sustained rise in serum 25(OH)D levels

Novel dual peptisers and curing agents derived from PET waste as N-alkyl benzene dicarboxamides for EDPM waste

Ethylene-propylene-diene monomer (EPDM) is widely used in the manufacturing of various components in rubber industries and hence recycling of scrap rubber is a major problem. In the present study, EPDM rubber waste powder has been recycled successfully by using N-alkyl benzene dicarboxamides, derived from PET wasteand other additives. Three aminolysed end products namely 1,4-benzene dicarboxamide, 1,4-benzene dicarbohydrazide and N,N′‐diaminoethyl 1,4‐benzene dicarboxamidewere used as peptisers and curing agents in the EPDM waste formulations. EPDM rubber waste sheets have been prepared at comparatively low temperature using two roll mill and compression moulding machine. Tensile strength, % elongation and hardness have been found in the range 12.23-20.19 kg/cm2, 107-145 % and 46-61, respectively. It has been expected that the developed reclaimed process described in this paper will promisingly support the protection of environment and conservation of resources with favors to rubber waste generated throughout the world

Improvement of Thermal Insulation and Crack Resistance of Plaster of Paris Composites at High Temperature

In the present work, silica gel is extracted from raw rice husk, incorporated in Plaster of Paris formulations and casted into sheets of varying thicknesses. The sheets were tested for thermal insulation at 60, 100, 150 & 200 °C and compared with blank formulations. Plaster of Paris composites with silica gel have shown remarkable increase in thermal insulation properties and crack resistance. Thermally insulated Plaster of Paris composites with excellent crack resistance have been developed which can be used competently for prolonged times even at high temperatures offering better serviceability and safety to the buildings

Determination of the bioavailability and biodistribution of a single dose of oral cholecalciferol/Calcirol® soft gelatin capsule by pharmacoscintigraphy- CalSci study

Background: It is required to study the bioavailability and biodistribution of specific cholecalciferol formulation before prescribing. Pharmacoscintigraphy is an established radiological-imaging technique that is used to map various drug formulations as they traverses the human body (biodistribution) in real-time. We evaluated the bioavailability and biodistribution pattern, transit time, and gastrointestinal clearance of a single dose of Calcirol® soft gelatin capsule 60,000 IU [an oral cholecalciferol (vitamin D) formulation] using pharmacoscintigraphy. Methods: Six male healthy adult volunteers were administered a single oral dose of Calcirol® soft gelatin capsule labelled with technetium-99m. Post-dosing, serial venous blood samples were collected till day 27 for the estimation of the plasma levels of 25-hydroxycholecalciferol and 1,25-dihydroxycholecalciferol levels. Different pharmacokinetic parameters were calculated. Sequential static gamma imaging was performed to evaluate the biodistribution of Calcirol® soft gelatin capsule. Descriptive statistics was used. Various pharmacokinetic parameters were calculated from the concentration-time curves. Statistical analysis was carried out using Student’s t-test. Suitable multivariate analysis was performed based on the distribution of data. All statistical analyses were performed using SAS® Software (v 9.4). Results: The overall absorption of Calcirol® soft gelatin capsule was 93.23%, which was fully from the small intestine. It led to achieving a sufficient level of 25-hydroxycholecalciferol (>60 ng/ml) within 6 hours of oral intake. The levels of plasma 25-hydroxycholecalciferol and 1,25-dihydroxycholecalciferol increased (maximum around 6 and 18 days, respectively). The small intestinal residence time was around 16 hours. No adverse event was noted. Conclusions: This was the first pharmacoscintigraphy study in the world which demonstrated the favourable bio-distribution of the Calcirol softgels supporting its role in vitamin D supplementation