196,589 research outputs found
Enhanced Azimuth Resolution in Synthetic Aperture Radar Using the MUSIC Algorithm
No full textThis paper addresses a considerable improvement of azimuth resolution in the stripmap mode of synthetic aperture radar (SAR) using the multiple-signal classification (MUSIC) algorithm. At first, the range compression and range migration correction are performed. Azimuth chirp signals of stationary targets will be resolved by conventional azimuth compression operation if the signals have slow-time separation larger than the reciprocal of their frequency bandwidth. Otherwise, they will be merged together and appear as a single stationary target in the SAR imaging. The scenario of close targets is modelled as a multipath problem and the corresponding time-delays are estimated using the super-resolution MUSIC algorithm. Therefore, stationary targets with close centers, which were merged by conventional azimuth compression operation, will be resolved and the azimuth resolution is considerably improved. Numerical results are presented to validate the theoretical discussions
A Computationally Efficient Approach for Velocity Estimation of Ground Moving Targets
No full textIn this paper, a novel algorithm for the parameters estimation of chirp signals is proposed. Chirp rate and centroid frequency of chirp signals are estimated based on a one-dimensional dechirp optimization problem (DOP). The proposed DOP algorithm is useful for synthetic aperture radar (SAR) systems since the azimuth signal of a moving target represents chirp properties, so the along-track and across-track velocities of moving targets can be efficiently estimated. The distinctive feature of the proposed DOP algorithm, as compared with other motion parameters estimators, is its efficiency from the computational point of view. This is obtained by converting the traditional two-dimensional search to an efficient and simple one-dimensional optimization problem. Finally, simulations are presented to validate the theoretical investigations
The Effect of Group Logotherapy on Spirituality and Death Anxiety of Patients with Cancer: An Open-Label Randomized Clinical Trial
No full textBackground: Cancer is one of the most important health problems, which cause anxiety. Owing to physical and psychological problems it may lead to thinking about impending death. Logotherapy is the most powerful method to treat problems that exist in nature.Objectives: This study aimed to determine the effect of group logotherapy on spirituality and death anxiety in patients with cancer.Methods: This randomized clinical trial study was done on patients with cancer referred to Imam Khomeini Hospital in Sari in 2017. Sixty-four eligible patients were selected from the oncology clinic using convenience sampling method. Patients were randomly allocated to the control and intervention groups (n = 32). Group logotherapy was done for the intervention group for five weeks. Data was gathered through a questionnaire, including demographic, Templer Death Anxiety Scale (DAS), and Spirituality Questionnaire (SQ) one week before and one week after the intervention. Data were analyzed in SPSS V.16 software using independent t-test, Wilcoxon, and Mann-Whitney U test. The significant level was considered 0.05.Results: There were no significant differences in death anxiety and spirituality scores between the two groups at baseline, indicating that the two groups were matched in terms of death anxiety and spirituality. Before the logotherapy, the mean score of death anxiety in both groups was high (more than 8). After the logotherapy, the mean and SD of death anxiety score in the intervention and control groups were 7.14 +/- 4.12 and 9.76 +/- 2.64, respectively, there were statistically significant differences in death anxiety scores between the groups (P < 0.05). There were statistically significant differences between the mean of spirituality score in the intervention group before and after the logotherapy (P < 0.05), but it was not significant in the control group, indicating that group logotherapy was effective in increasing the spirituality score.Conclusions: Based on the findings, group logotherapy can increase the spirituality score of the patients. Moreover, the logotherapy may result in decreasing death anxiety, and spirituality-oriented meetings may be beneficial for patients
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states.
By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement.
To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Dr. Glendon Swarthout
No full textHosted by Roger M. Busfield, MSU Assistant Professor of Speech and Theater, Meet the Author is designed to introduce a general audience to a contemporary author and their work through in-depth interviews. This episode features a conversation between Dr. Glendon Swarthout, prolific author and English professor at MSU, and assistant professors Sam S. Baskett and Theodore B. Strandness
Biodiversity of isolated cyanobacteria from desert soils in Iran
No full textCyanobacteria are among the most ubiquitous, ecologically important photo-autotrophs on the Earth.
They play important roles in terrestrial environments, especially in arid and semi-arid regions. In this study,
the morphological and genetic diversity of the cyanobacteria inhabiting desert soil in Iran were
investigated for the first time. The samples were collected at 40 different sites in the Kavir National Park.
After cultivation and morphological identification, the 16S rRNA gene was sequenced from the
cyanobacterial cultures. Twenty-seven different isolates were genetically and morphologically identified in
23 sites. Morphotypes fitted the description of five genera Phormidium, Trichocoleus, Leptolyngbya,
Microcoleus and Tychonema with an abundance of 44.45, 37.04, 11.11, 3.7 and 3.7%, respectively.
Sequence comparisons of samples in the National Center for Biotechnology Information (NCBI) and
morphological data showed that 48et and 50et strains had 94% similarity to P. animale and 97% similarity
to Microcoleus sp., respectively. These strains formed a separate and longer branch in the phylogenetic
tree, suggesting relatively distant phylogenetic relationships with other sequences in this study. It seems
that these sequences are new strains and other markers are needed for further investigation. Soil analysis
showed salinity ranged from 0.23 to 87.8 dS/m and the genus that showed the highest salinity tolerance
was Phormidium. The presence of cyanobacterial strains in the Kavir National Park showed that despite the
harsh conditions, this place is biologically active
Simulation of thermal plant optimization and hydraulic aspects of thermal distribution loops for large campuses
Get PDFFollowing an introduction, the author describes Texas A&M University and its utilities system. After that, the author presents how to construct simulation models for chilled water and heating hot water distribution systems. The simulation model was used in a $2.3 million Ross Street chilled water pipe replacement project at Texas A&M University. A second project conducted at the University of Texas at San Antonio was used as an example to demonstrate how to identify and design an optimal distribution system by using a simulation model. The author found that the minor losses of these closed loop thermal distribution systems are significantly higher than potable water distribution systems. In the second part of the report, the author presents the latest development of software called the Plant Optimization Program, which can simulate cogeneration plant operation, estimate its operation cost and provide optimized operation suggestions. The author also developed detailed simulation models for a gas turbine and heat recovery steam generator and identified significant potential savings. Finally, the author also used a steam turbine as an example to present a multi-regression method on constructing simulation models by using basic statistics and optimization algorithms. This report presents a survey of the author??s working experience at the Energy Systems Laboratory (ESL) at Texas A&M University during the period of January 2002 through March 2004. The purpose of the above work was to allow the author to become familiar with the practice of engineering. The result is that the author knows how to complete a project from start to finish and understands how both technical and nontechnical aspects of a project need to be considered in order to ensure a quality deliverable and bring a project to successful completion. This report concludes that the objectives of the internship were successfully accomplished and that the requirements for the degree of Degree of Engineering have been satisfied
How should we assess the mechanical properties of lower-limb prosthesis technology used in elite sport?: An initial investigation
No full textDespite recent controversy, it is not yet formally recognised how lower-limb prosthesis should be assessed for their performance. To assist in this process, experiments are undertaken to investigate the linearity, stiffness and assessment of feet based energy return prosthesis technology typically used for elite level high speed running. Through initial investigations, it is concluded that static load testing would not be recommended to specify or regulate energy return prostheses for athletes with a lower-limb amputation. Furthermore, an assessment of energy return technology when loaded under dynamic conditions demonstrates changes in mechanical stiffness due to bending and effective blade length variation during motion. Such radical changes of boundary conditions due to loading suggest that any assessment of lower-limb prosthesis technology in the future should use methods that do not assume linear mechanical stiffness. The research into such effects warrants further investigation in the future
- …
