Two different clay levels at mean depths of about 2 and 4 m depth have been imaged.docx

1、Two different clay levels at mean depths of about 2 and 4 m depth have been imagedTitans surface at 2.2-cm wavelength imaged by the Cassini RADAR radiometer: Calibration and first resultsOriginal Research ArticleIcarus, Volume 200, Issue 1, March 2009, Pages 222-239M.A. Janssen, R.D. Lorenz, R. West

2、, F. Paganelli, R.M. Lopes, R.L. Kirk, C. Elachi, S.D. Wall, W.T.K. Johnson, Y. Anderson, R.A. Boehmer, P. Callahan, Y. Gim, G.A. Hamilton, K.D. Kelleher, L. Roth, B. Stiles, A. Le Gall and the Cassini Radar TeamClose preview| Related articles|Related reference work articles AbstractAbstract | Figur

3、es/TablesFigures/Tables | ReferencesReferences AbstractThe first comprehensive calibration and mapping of the thermal microwave emission from Titans surface is reported based on radiometric data obtained at 2.2-cm wavelength by the passive radiometer included in the Cassini Radar instrument. The dat

4、a reported were accumulated from 69 separate observational segments in Titan passes from Ta (October 2004) through T30 (May 2007) and include emission from 94% of Titans surface. They are diverse in the key observing parameters of emission angle, polarization, and spatial resolution, and their reduc

5、tion into calibrated global mosaic maps involved several steps. Analysis of the polarimetry obtained at low to moderate resolution (50+ km) enabled integration of the radiometry into a single mosaic of the equivalent brightness temperature at normal incidence with a relative precision of about 1 K.

6、The Huygens probe measurement of Titans surface temperature and radiometry obtained on Titans dune fields allowed us to infer an absolute calibration estimated to be accurate to a level approaching 1 K. The results provide evidence for a surface that is complex and varied on large scales. The radiom

7、etry primarily constrains physical properties of the surface, where we see strong evidence for subsurface (volume) scattering as a dominant mechanism that determines the emissivity, with the possibility of a fluffy or graded-density surface layer in many regions. The results are consistent with, but

8、 not necessarily definitive of a surface composition resulting from the slow deposition and processing of organic compounds from the atmosphere.Article Outline1. Introduction2. The Cassini radiometer 2.1. Description2.2. Calibration 2.2.1. Beam calibration2.2.2. Relative gain calibration3. Observati

9、ons and initial calibration4. Mapping Titan 4.1. Summary4.2. Emission model4.3. Dielectric mosaic4.4. Brightness temperature mosaic4.5. Mosaic uncertainties4.6. Absolute calibration5. Discussion6. ConclusionsAcknowledgementsReferencesPurchase$ 31.50677Analysis of underwater mammal vocalisations usin

10、g timefrequency-phase trackerOriginal Research ArticleApplied Acoustics, Volume 71, Issue 11, November 2010, Pages 1070-1080Cornel Ioana, Cdric Gervaise, Yann Stphan, Jerme I. MarsClose preview| Related articles|Related reference work articles AbstractAbstract | Figures/TablesFigures/Tables | Refere

11、ncesReferences AbstractOne of the most challenging applications of timefrequency representations deals with the analysis of the signal issued from natural environment. Recently, the interest for passive underwater context increased, basically due to the rich information carried out by the natural si

12、gnals. Taken into account the non-linear multi-component timefrequency behaviour of such signals, their analysis is a challenging problem. In this context, the analysis of underwater mammals whistles is aimed to extract, accurately and adaptively, their main timefrequency components. In this paper,

13、we define a timefrequency-phase tracker which is composed of three steps. The first one consists of modelling the short-time segments of the vocalization by a set of third order polynomial phase modulations. The second step consists in the fusion of local polynomial phase modulations according to a

14、local phase continuity criterion. Finally, in the third step, the detected timefrequency track is used to design the timefrequency filter, in charge of extracting the samples corresponding to the detected track. This procedure is then iterated until all component of interest are extracted. Tests pro

15、vided for realistic scenarios and real data taken in Bay of Biscay at September 2009 containing whistles of common dolphin Delphinus delphis illustrate the potential and the benefits of the proposed approach.Article Outline1. Introduction2. Timefrequency-phase tracker 2.1. Step 1: short time analysi

16、s2.2. Step 2: selection and fusion2.3. Step 3: component extraction3. Results on real data4. ConclusionAcknowledgementsReferencesPurchase$ 41.95678Optimization of press bend forming path of aircraft integral panelOriginal Research ArticleTransactions of Nonferrous Metals Society of China, Volume 20,

17、 Issue 2, February 2010, Pages 294-301Yu YAN, Min WAN, Hai-bo WANG, Lin HUANGClose preview| Related articles|Related reference work articles AbstractAbstract | ReferencesReferences AbstractIn order to design the press bend forming path of aircraft integral panels, a novel optimization method was pro

18、posed, which integrates FEM equivalent model based on previous study, the artificial neural network response surface, and the genetic algorithm. First, a multi-step press bend forming FEM equivalent model was established, with which the FEM experiments designed with Taguchi method were performed. Th

19、en, the BP neural network response surface was developed with the sample data from the FEM experiments. Furthermore, genetic algorithm was applied with the neural network response surface as the objective function. Finally, verification was carried out on a simple curvature grid-type stiffened panel

20、. The forming error of the panel formed with the optimal path is only 0.098 39 and the calculating efficiency has been improved by 77%. Therefore, this novel optimization method is quite efficient and indispensable for the press bend forming path designing.Purchase$ 31.50679Erratum to “Failure analy

21、sis of brazed air passages of an aircraft fuel system Engineering Failure Analysis, Volume 17, Issue 6, September 2010, Pages 14951499”Engineering Failure Analysis, Volume 18, Issue 1, January 2011, Page 531A.R. Etemadi, P. Behjati, H.R. Madaah Hosseini, A.H. KokabiClose preview| Related articles|Re

22、lated reference work articles AbstractAbstract AbstractAir passages of an aircraft fuel system are manufactured from 4130 steel tubes brazed using BNi-4 filler metal. It was observed that brazed tubes leak after flying about 100h. In this case study, microscopy techniques and hardness measurements w

23、ere employed to identify the root cause of this failure. It was found that wide joint clearance promotes brittle phases at the joint centerline which can act as crack nucleation sites under thermal expansion and misalignment stresses. Based on the obtained results, joint clearance was reduced to opt

24、imum value. This reduction prohibited the occurrence of leakage and solved the problem.Purchase$ 31.50680Decorrelating wireless sensor network traffic to inhibit traffic analysis attacksOriginal Research ArticlePervasive and Mobile Computing, Volume 2, Issue 2, April 2006, Pages 159-186Jing Deng, Ri

25、chard Han, Shivakant MishraClose preview| Related articles|Related reference work articles AbstractAbstract | Figures/TablesFigures/Tables | ReferencesReferences AbstractTypical packet traffic in a sensor network reveals pronounced patterns that allow an adversary analyzing packet traffic to deduce

26、the location of a base station. Once discovered, the base station can be destroyed, rendering the entire sensor network inoperative, since a base station is a central point of data collection and hence failure. This paper investigates a suite of decorrelation countermeasures aimed at disguising the

27、location of a base station against traffic analysis attacks. A set of basic countermeasures is described, including hop-by-hop reencryption of the packet to change its appearance, imposition of a uniform packet sending rate, and removal of correlation between a packets receipt time and its forwardin

28、g time. More sophisticated countermeasures are described that introduce randomness into the path taken by a packet. Packets may also fork into multiple fake paths to further confuse an adversary. A technique is introduced to create multiple random areas of high communication activity called hot spot

29、s to deceive an adversary as to the true location of the base station. The effectiveness of these countermeasures against traffic analysis attacks is demonstrated analytically and via simulation using three evaluation criteria: total entropy of the network, total overhead/energy consumed, and the ab

30、ility to frustrate heuristic-based search techniques to locate a base station.Article Outline1. Introduction2. Network traffic and threat model3. Basic decorrelation countermeasures 3.1. Hidden packet destination address3.2. Decorrelating packet sending times3.3. Controlling packet sending rates3.4.

31、 Limitations4. Inhibiting traffic analysis attacks with randomized traffic 4.1. Multi-parent routing scheme4.2. Random walk4.3. Fractal propagation 4.3.1. Fractal propagation with different forking probabilities4.3.2. Enforced fractal propagation4.4. Node compromises4.5. Simulation results and summary5. Evaluation 5.1. Evaluation criteria5.2. Message overhead of rate control mechanism5.3. Effectiveness and cost of randomized traffic techniques5.4. Effectiveness of pr and pf6. Related work7. Future work8. ConclusionAcknowledgementsReferencesVitaePurchase$ 41.95681