نتایج جستجو برای: touchdown point
تعداد نتایج: 525047 فیلتر نتایج به سال:
Amethod for thenumerical computation of reachable sets for hybrid systems is presented andapplied to thedesign and safety analysis of autoland systems. It is shown to be applicable to specific phases of landing: descent, flare, and touchdown. The method is based on optimal control and level set methods; it simultaneously computes a maximal controlled invariant set and a set-valued control law g...
We consider a free boundary problem modeling electrostatic microelectromechanical systems. The model consists of a fourth-order damped wave equation for the elastic plate displacement which is coupled to an elliptic equation for the electrostatic potential. We first review some recent results on existence and nonexistence of steady-states as well as on local and global well-posedness of the dyn...
Available commercial kits only screen for the most common cystic fibrosis transmembrane conductance regulator (CFTR) mutations causing classic cystic fibrosis and for the Tn variant in IVS8. However, full scanning of CFTR is needed for the diagnosis of patients with cystic fibrosis or CFTR-related disorders (including congenital bilateral absence of the vas deferens) bearing rare mutations. Sta...
Our research task in NASA’s Mars Technology Program focuses on terrain relative state estimation during planetary descent to enable pin-point landing. In this task we have developed estimation algorithms that fuse inertial and visual measurements as well as computer vision algorithms that automatically extract landmark locations and terrain feature tracks through a sequence of images. These alg...
This paper deals with the development of guidance, navigation and control algorithms for a prototype of a miniature aerial delivery system capable of high-precision maneuvering and high touchdown accuracy. High accuracy enables use in precision troop resupply, sensor placement, urban warfare reconnaissance, and other similar operations. Specifically, this paper addresses the terminal phase, whe...
Abstract The Entry, Descent and Landing Demonstrator Module (EDM) named Schiaparelli, was the ESA-led Mars lander element of ESA-Roscosmos ExoMars 2016 mission. Following launch on 14 March with Trace Gas Orbiter (TGO) cruise to Mars, Schiaparelli separated for encounter demonstrate entry, descent landing technologies. Although 19 October final touchdown surface operation were not achieved, oth...
The advent of fluorescence-based quantitative real-time PCR (qPCR) has revolutionized the quantification of gene expression analysis in many fields, including life sciences, agriculture, forensic science, molecular diagnostics, and medicine. While SYBR Green-based qPCR is the most commonly-used platform due to its inexpensive nature and robust chemistry, quantifying the expression of genes with...
The polymerase chain reaction (PCR) is an easy, economic, convenient and biochemical technology in molecular biology for the amplification of thousands to millions of copies of a particular DNA sequence. The method consists of repetitive cycles of three steps: denaturation, hybridization, and polymerase extension, that raising temperature to break hydrogen bonds for formation of the single stra...
background : q fever is a zoonotic disease caused by inhalation of the bacterium coxiella burnetii . ruminant livestock are common reservoirs for c. burnetii , and bacteria present in aerosols derived from the waste of infected animals can infect humans . c. burnetii is thought to infect humans primarily via airborne transmission. methods : 64 environmental swab samples were collected from 24 ...
Despite an intuitive relationship between technique and both running economy (RE) and performance, and the diverse techniques used by runners to achieve forward locomotion, the objective importance of overall technique and the key components therein remain to be elucidated. PURPOSE This study aimed to determine the relationship between individual and combined kinematic measures of technique w...
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