Body-freedom flutter of a 1/2-scale forward-swept-wing model, an experimental and analytical study

The aeroelastic phenomenon known as body-freedom flutter (BFF), a dynamic instability involving aircraft-pitch and wing-bending motions which, though rarely experienced on conventional vehicles, is characteristic of forward swept wing (FSW) aircraft was investigated. Testing was conducted in the Langley transonic dynamics tunnel on a flying, cable-mounted, 1/2-scale model of a FSW configuration with and without relaxed static stability (RSS). The BFF instability boundaries were found to occur at significantly lower airspeeds than those associated with aeroelastic wing divergence on the same model. For those cases with RSS, a canard-based stability augmentation system (SAS) was incorporated in the model. This SAS was designed using aerodynamic data measured during a preliminary tunnel test in which the model was attached to a force balance. Data from the subsequent flutter test indicated that BFF speed was not dependent on open-loop static margin but, rather, on the equivalent closed-loop dynamics provided by the SAS. Servo-aeroelastic stability analyses of the flying model were performed using a computer code known as SEAL and predicted the onset of BFF reasonably well

A review of Bluetooth and NFC for financial applications

Abstract: Bluetooth and near field communications (NFC) are two of the most recently emerging wireless technologies [1] [2], largely because of the integral role they play in the Internet of everything (IoE). In this paper, the security aspect is evaluated for these two wireless technologies for potential applications in financial systems. Their frame size is also analyzed. This is done by reviewing their characteristics based on the state of the art and on the standards governing their deployment. It is found that Bluetooth has good security mechanisms when compared to NFC, which requires developers to implement their own security features at application level; however, NFC’s short range and its requirement for intentional communication between devices makes it inherently secure. It is also found that NFC has a larger message size, however, the classic Bluetooth message size is not that far below that of NFC data exchange format (NDEF) short records (SR) message size

Pusat Pendidikan Dan Pengembangan Anak Autis Di Manado ‘Implementasi Metode Lovaas Terhadap Ruang Dalam Arsitektur'

Anak merupakan generasi penerus bangsa yang, memiliki anak yang sehat tanpa kekurangan merupakan impian setiap pasangan, Namun tidak semua anak terlahir dengan sempurna tetapi ada juga anak yang lahir tidak sempurna yang terkadang sulit di terima oleh orang tua dan lingkungan sekitar, salah satu contohnya adalah anak Autis. Di Manado Autisme sudah sangat dikenal oleh masyarakat luas, tapi masih banyak juga yang belum mengetahui bahwa kelainan ini bisa disembuhkan, itu dibuktikan dengan masih kurangnya sekolah atau yayasan yang menangani / melakukan proses terapi penyembuhan kepada anak – anak autis. Menghadirkan suatu bangunan / fasilitas yang dapat mewadahi kegiatan pendidikan serta mengembangkan potensi dan prilaku anak autis serta menjadi tempat untuk mendapatkan informasi mengenai autisme bagi masyarakat luas. Menyediakan wadah yang bisa menampung aktivitas – aktivitas yang berhubungan dengan anak autis itu sendiri, sehingga anak autis dapat berkembang dan dapat diterima oleh masyarakat. Dalam rancangan objek “Pusat Pendidikan Dan Pengembangan Anak Autis Di Manado” ini menggunakan tema “implementasi metode Lovaas terhadap ruang dalam arsitektur”, dimana metode Lovaas merupakan metode yang sering dilakukan para terapis/guru untuk penyembuhan / terapis bagi anak – anak autis dan anak – anak yang berprilaku khusus lainnya, yang kemudian dituangkan dalam perancangan ruang dalam serta sirkulasi dalam bangunan, sehingga arsitektur dapat berperan dalam proses penyembuhan anak autis

Review of power line communications standards in Africa

The standards in power line communications (PLC) calibrate parameters such as frequencies allocation, signal level, security, topology of the network and many others parameters. The leap forward of power line communications technology is motivated by the willingness of the standardization organizations (SDO)s such as ITU, IEC, ISO, IEEE, CENELEC to define how the technologies are going to be deployed. This paper presents the different SDOs, Alliances and groups regulating the PLC sector. The interoperability and coexistence for some technologies are underlined. The process of developing PLC standards by ITU, IEEE 1901, CENELEC is described. The advantages and disadvantages of using PLC technology in Africa are discussed

The Papers of Thomas A. Edison

This richly illustrated volume explores Edison’s inventive and personal pursuits from 1885 to 1887.Two decades after the American Civil War, no name was more closely associated with the nation’s inventive and entrepreneurial spirit than that of Thomas Edison. The restless changes of those years were reflected in the life of America’s foremost inventor. Having cemented his reputation with his electric lighting system, Edison had decided to withdraw partially from that field. At the start of 1885, newly widowed at mid-life with three young children, he launched into a series of personal and professional migrations, setting in motion chains of events that would influence his work and fundamentally reshape his life. Edison’s inventive activities took off in new directions, flowing between practical projects (such as wireless and high-capacity telegraph systems) and futuristic ones (exploring forms of electromagnetic energy and the convertibility of one to another). Inside of two years, he would travel widely, marry the daughter of a prominent industrialist and religious educator, leave New York City for a grand home in a sylvan suburb, and construct a winter laboratory and second home in Florida. Edison’s family and interior life are remarkably visible at this moment; his papers include the only known diary in which he recorded personal thoughts and events. By 1887, the familiar rhythms of his life began to reassert themselves in his new settings; the family faded from view as he planned, built, and occupied a New Jersey laboratory complex befitting his status. The eighth volume of the series, New Beginnings includes 358 documents (chosen from among thousands) that are the most revealing and representative of Edison’s work, life, and place in American culture in these years. Illustrated with hundreds of Edison’s drawings, these documents are further illuminated by meticulous research on a wide range of sources, including the most recently digitized newspapers and journals of the day

A global health action agenda for the Biden administration

Joe Biden will assume the US presidency at a time of unprecedented global health crises, with the COVID-19 pandemic and major setbacks in reducing poverty, hunger, and disease. The COVID-19 pandemic offers rare opportunities for the US President-elect to spearhead long-overdue structural changes and revitalise global health leadership. Building trust among global partners will be challenging, given the USA\u27s withdrawal from, and disruption of, international cooperation under the presidency of Donald Trump. The USA will have to lead in a different, more collaborative way. Here, we offer a Global Action Agenda for the Biden Administration

Older adults' attitudes about continuing cancer screening later in life: a pilot study interviewing residents of two continuing care communities

BACKGROUND: Individualized decision making has been recommended for cancer screening decisions in older adults. Because older adults' preferences are central to individualized decisions, we assessed older adults' perspectives about continuing cancer screening later in life. METHODS: Face to face interviews with 116 residents age 70 or over from two long-term care retirement communities. Interview content included questions about whether participants had discussed cancer screening with their physicians since turning age 70, their attitudes about information important for individualized decisions, and their attitudes about continuing cancer screening later in life. RESULTS: Forty-nine percent of participants reported that they had an opportunity to discuss cancer screening with their physician since turning age 70; 89% would have preferred to have had these discussions. Sixty-two percent believed their own life expectancy was not important for decision making, and 48% preferred not to discuss life expectancy. Attitudes about continuing cancer screening were favorable. Most participants reported that they would continue screening throughout their lives and 43% would consider getting screened even if their doctors recommended against it. Only 13% thought that they would not live long enough to benefit from cancer screening tests. Factors important to consider stopping include: age, deteriorating or poor health, concerns about the effectiveness of the tests, and doctors recommendations. CONCLUSION: This select group of older adults held positive attitudes about continuing cancer screening later in life, and many may have had unrealistic expectations. Individualized decision making could help clarify how life expectancy affects the potential survival benefits of cancer screening. Future research is needed to determine whether educating older adults about the importance of longevity in screening decisions would be acceptable, affect older adults' attitudes about screening, or change their screening behavior

Exercise for reducing fear of falling in older people living in the community: Cochrane systematic review and meta-analysis

Objective: To determine the effect of exercise interventions on fear of falling in community-living people aged ≥65 years. Design: Systematic review and meta-analysis. Bibliographic databases, trial registers and other sources were searched for randomised or quasi-randomised trials. Data were independently extracted by pairs of reviewers using a standard form. Results: Thirty trials (2878 participants) reported 36 interventions (Tai Chi and yoga (n=9); balance training (n=19); strength and resistance training (n=8)). The risk of bias was low in few trials. Most studies were from high income countries (Australia=8, USA=7). Intervention periods (26 weeks=7) and exercise frequency (1-3 times/week=32; ≥4 times/week=4) varied between studies. Fear of falling was measured by single-item questions (7) and scales measuring falls efficacy (14), balance confidence (9) and concern or worry about falling (2). Meta-analyses showed a small to moderate effect of exercise interventions on reducing fear of falling immediately post intervention (standardised mean difference (SMD) 0.37, 95% CI 0.18, 0.56; 24 studies; low quality evidence). There was a small, but not statistically significant effect in the longer term (<6 months (SMD 0.17, 95% CI -0.05, 0.38 (four studies) and ≥ 6 months post intervention SMD 0.20, 95% CI -0.01, 0.41 (three studies)). Conclusions: Exercise interventions probably reduce fear of falling to a small to moderate degree immediately post-intervention in community-living older people. The high risk of bias in most included trials suggests findings should be interpreted with caution. High quality trials are needed to strengthen the evidence base in this area

Exercise therapy in adults with serious mental illness: a systematic review and meta-analysis

Background: Individuals with serious mental illness are at a higher risk of physical ill health. Mortality rates are at least twice those of the general population with higher levels of cardiovascular disease, metabolic disease, diabetes, and respiratory illness. Although genetics may have a role in the physical health problems of these patients, lifestyle and environmental factors such as levels of smoking, obesity, poor diet, and low levels of physical activity also play a prominent part.&lt;p&gt;&lt;/p&gt; Objective: To conduct a systematic review and meta-analysis of randomised controlled trials comparing the effect of exercise interventions on individuals with serious mental illness.&lt;p&gt;&lt;/p&gt; Methods: Searches were made in Ovid MEDLINE, Embase, CINAHL, PsycINFO, Biological Abstracts on Ovid, and The Cochrane Library (January 2009, repeated January 2013) through to February 2013.&lt;p&gt;&lt;/p&gt; Results: Eight RCTs were identified in the systematic search. Six compared exercise versus usual care. One study assessed the effect of a cycling programme versus muscle strengthening and toning exercises. The final study compared the effect of adding specific exercise advice and motivational skills to a simple walking programme. Exercise programmes were noted by their heterogeneity in terms of the type of exercise intervention, setting, and outcome measures. The review found that exercise improved levels of exercise activity (n=13, standard mean difference [SMD] 1.81, CI 0.44 to 3.18, p = 0.01). No beneficial effect was found on negative (n = 84, SMD = -0.54, CI -1.79 to 0.71, p = 0.40) or positive symptoms of schizophrenia (n = 84, SMD = -1.66, CI -3.78 to 0.45, p = 0.12). No change was found on body mass index compared with usual care (n= 151, SMD = -0.24, CI -0.56 to 0.08, p = 0.14), or body weight (n = 77, SMD = 0.13, CI -0.32 to 0.58, p = 0.57). No beneficial effect was found on anxiety and depressive symptoms (n = 94, SMD = -0.26, CI -0.91 to 0.39, p = 0.43), or quality of life in respect of physical and mental domains. One RCT measured the effect of exercise on exercise intensity, attendance, and persistence at a programme. No significant effect was found on these measures.&lt;p&gt;&lt;/p&gt; Conclusions: This systematic review showed that exercise therapies can lead to a modest increase in levels of exercise activity but overall there was no noticeable change for symptoms of mental health, body mass index, and body weight.&lt;p&gt;&lt;/p&gt