The Mars Science Laboratory (MSL) Entry Descent and Landing Instrumentation (MEDLI) suite on MSL entry vehicle heatshield has successfully returned pressure, temperature, thermal protection system (TPS) ablation data acquired during entry. This paper provides an initial assessment of MEDLI instrumentation that is comprised in-depth temperatures in the TPS made Phenolic-Impregnated Carbon Ablator (PICA). Temperatures are measured at seven different locations surface. sensor plugs also...

High rates of recession in arc jet shear tests Phenolic Impregnated Carbon Ablator (PICA) inspired a series and analysis on FiberForm (a carbon preform used the fabrication PICA). Arc were performed both air pure nitrogen for stagnation configurations. The showed little or no recession, while similar to that PICA (when adjusted difference density). While mechanical erosion can not be ruled out, this is first step doing so. Analysis using oxidation boundary condition within DPLR was predict...

Reliable and early detection of leaks in pipelines transporting liquid or gas is highly desirable. In this work, two orthogonal technologies based on high-sensitivity fiber-optic distributed sensing were integrated into one system tested for their effectiveness actual field installations. The first technology temperature difference using Distributed Differential Temperature Sensor (DdTS DDTS). second Acoustic (DAS), which uses Coherent Optical Time-Domain Reflectometry (C-OTDR). DdTS can...

In recent years a great deal of research has been published using peak power (PP) in the jump squat (JS) exercise as measure athletic performance. However, no standardized method for determination PP exists at this time to accurately evaluate variable. Our proposed (PM) determining (PPPM) JS uses product vertical ground reaction forces and velocity center mass both subject external resistance loaded Olympic bar. Fifteen male subjects with mean age 27 ± 3 years, weight 78 17 kg, height 175 10...

Leaks in pipelines transporting oil, gas, or any tluid may cause enormous propern and environmental damage, hence early leak detection accurate localization are highly desirable. Sensors to detect leaks can be broadly classified into internal external sensors depending on where they installed. In general, have matured over decades while based fiber optics just beginning show promise for precise detection. this work, a novel technology DdTS (Distributed Differential Temperature Sensor) is...

The purpose of this study was to compare agonist and antagonist electromyography (EMG) during an isokinetic fatigue protocol in subjects with cerebral palsy (CP) typical development (TD).Nine individuals CP 11 TD completed 50 repetitions maximum concentric knee extensions (KE) flexions (KF) at 60°/second.Rate decline peak torque for KE significantly less compared TD. Rate EMG not different between groups, but the rate greater CP. There were no differences groups KF.Declining occurred...

A series of stagnation tests in the 21.5-inch nozzle 60 MW Interaction Heating Facility arc jet at NASA Ames Research Center were run model dimensions much larger than previously conducted. Prior to design large-scale test articles, an axisymmetric CFD framework was extended and applied this problem, it discovered that real issue for large scale testing is capture bow shock wave by diffuser. Based on computational results, determined models up 50% blockage could be tested safely, thus...

Repetitive loading of the low back tissues induces tension relaxation with a corresponding variation in myoelectric response neuromuscular system, which may influence health. The purpose this study was to observe trunk muscle activities before and after passive cyclic flexion-extension exercise.Nineteen participants were subjected sagittal plane tissues. These individuals performed toe-touching over 1 hour load termination.Lumbar paraspinal activity cessation occurred significantly sooner...

This paper addresses surface roughness measurements obtained from arc jet tests of Avcoat that were conducted in four different facilities at NASA Ames Research Center for Orion. Approaches and techniques testing, measuring, modeling fluid material response laminar turbulent flows these are presented. Measured test conditions consistent with corresponding computational simulations each facility, results demonstrate while the create flow artifacts on surfaces samples, facility generates...

A buried fiber-optic target classification sensor capable of detecting and classifying human movement, digging, machine vehicle movement was successfully tested at lengths up to 40 km for border security applications. The 2-3 feet deep in native, predominantly clay soil. Over the period one year, a variety environmental conditions including dry soil summer, wet after heavy rain, frozen snow-covered winter. At km, detected classified manual digging as well walking both parallel perpendicular...

Background External loading of the ligamentous tissues induces mechanical creep, which modifies neuromuscular response to perturbations. It is not well understood how creep affects athletic performance and contributes modifications knee biomechanics during functional tasks. Hypothesis/purpose The purpose this study was examine responses single leg drop landing perturbations before after passive joint. Methods Descriptive laboratory study. Male (n = 7) female 14) participants' (21.3 ± 2.1...

Previous research on body image and disordered eating in competitive Caucasian women athletes shows that there is a notably higher prevalence of concerns practices compared to non-athletes. However, little data exist regarding risks between African American PURPOSE: The purpose this study was determine if, large sample collegiate athletes, greater risk negative and/or behaviors/attitudes college aged non athletes. METHODS: Subjects were 107 (AA) women; about half whom (n = 52) participating...

Previous literature has indicated a modified response of the lumbar paraspinal (LP) muscles after fatigue and sustained passive trunk flexion, but not during cyclic movement. LP latencies are important to understand etiology injury trunk-spine system. PURPOSE: To observe muscle times quick releases performed flexion-extension (TF-E) exercise. METHODS: Participants were 4 men (23 ± 3 yrs, 176 6 cm, 82 kg) with no back or lower extremity dysfunction. sat on backless chair positioned platform...