44 research outputs found
Late socialist revolutionary achievements of the township of Filipov: Cahiers du CEFRES N° 30, Le communisme à partir des sociétés - Communism from the viewpoint of societies
No full textInternational audienceFilipov is a township of three thousand, in the border and mostly agricultural county of Dubno, in Eastern Moravia. The author analyses how, though Filipov took a long time to recover from the post-war collapse and the socialist transformation, it gradually became a stable and prosperous municipality in a quiet county where, even as late as 1989, there was almost no indication that some changes in its well established way of life would soon arrive. It seems that when the changes occurred, the people of Filipov successfully passed through the phases of the Revolution (or, more precisely, the transfer of power) in a way that mirrored exactly how changes occurred at the centre. Indeed, it was not until the period 1997 to 1999, when the township was studied, that Filipov was forced to confront a crisis because of overspending on development motivated by the “Construction Spirit”, a legacy from Real Socialism. Kabele therefore asks the question why the people of Filipov completed a “Velvet Revolution” when the town was doing well, and why did it fail
Tailoring stiffness of deployable origami structures
No full textEmbargo set by: Seth Robbins for item 98713
Lift date: 2019-03-01T17:03:32Z
Reason: Author requested closed access (OA after 2yrs) in Vireo ETD systemOrigami has gained popularity in science and engineering because a compactly stowed system can be folded into a transformable 3D structure with increased functionality. Origami can also be reconfigured and programmed to change shape, function, and mechanical properties. In this thesis, we explore origami from structural and stiffness perspectives, and in particular we study how geometry affects origami behavior and characteristics. Understanding origami from a structural standpoint can allow for conceptualizing and designing feasible applications in all scales and disciplines of engineering.
We improve, verify, and test a bar and hinge model that can analyze the elastic stiffness, and estimate deformed shapes of origami. The model simulates three distinct behaviors: stretching and shearing of thin sheet panels; bending of the flat panels; and bending along prescribed fold lines. We explore the influence of panel geometry on origami stiffness, and provide a study on fold line stiffness characteristics. The model formulation incorporates material characteristics and provides scalable, and isotopic behavior. It is useful for practical problems such as optimization and parametrization of geometric origami variations.
We explore the stiffness of tubular origami structures based on the Miura-ori folding pattern. A unique orientation for zipper coupling of rigidly foldable origami tubes substantially increases stiffness in higher order modes and permits only one flexible motion through which the structure can deploy. Deployment is permitted by localized bending along folds lines, however other deformations are over-constrained and engage the origami sheets in tension and compression. Furthermore, we couple compatible origami tubes into a variety of cellular assemblages that can enhance mechanical characteristics and geometric versatility. Practical applications such as deployable slabs, roofs, and arches are also explored.
Finally, we introduce origami tubes with polygonal cross-sections that can reconfigure into numerous geometries. The tubular structures satisfy the mathematical definitions for flat and rigid foldability, meaning that they can fully unfold from a flattened state with deformations occurring only at the fold lines. From a global viewpoint, the tubes do not need to be straight, and can be constructed to follow a non-linear curved line when deployed. From a local viewpoint, their cross-sections and kinematics can be reprogrammed by changing the direction of folding at some folds.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2018-12-01The student, Evgueni Filipov, accepted the attached license on 2016-11-30 at 15:41.The student, Evgueni Filipov, submitted this Dissertation for approval on 2016-11-30 at 15:54.This Dissertation was approved for publication on 2016-12-01 at 14:38.DSpace SAF Submission Ingestion Package generated from Vireo submission #10379 on 2017-02-28 at 14:42:29Made available in DSpace on 2017-03-01T17:01:48Z (GMT). No. of bitstreams: 3
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Previous issue date: 2016-12-01Embargo set by: Seth Robbins for item 98713
Lift date: 2019-03-01T17:02:22Z
Reason: Author requested closed access (OA after 2yrs) in Vireo ETD systemEmbargo set by: Seth Robbins for item 98713
Lift date: 2019-03-01T17:05:02Z
Reason: Author requested closed access (OA after 2yrs) in Vireo ETD systemEmbargo set by: Seth Robbins for item 98713
Lift date: 2019-03-01T17:06:55Z
Reason: Author requested closed access (OA after 2yrs) in Vireo ETD systemLimited Restriction Lifted for Item 98713 on 2019-03-02T10:15:33Z
Robotic-Assisted Laparoscopic Surgery for Rectal Cancer (RALS): A Review of the Literature
No full textSurgical treatment of rectal cancer is still difficult even in big centers. The limited pelvic space, problematic operative exposure, complex surgeries with more common anastomotic complications make the results unsatisfying. After the concept of total mesorectal excision (TME) was introduced by Heald, the results have improved dramatically. Advances in technology added further excitement about awaited promising results. Surgeons tried to apply all new methods to search for the best treatment: – atraumatic, painless, safe, with low recurrence rates, fast recovery, with an acceptable price, and easy to learn or teach. Robotic-assisted laparoscopic surgery (RALS) was introduced to overcome the limitations of conventional laparoscopic and open surgery and improve on their main advantages.A non-systematic literature review on the articles on RALS in the PubMed and Scopus database was performed. RALS, robotic-assisted laparoscopic surgery, and rectal cancer keywords were used. The search was restricted to articles in English, with main endpoints of interest on short-term and long-term surgical results and oncological outcomes. Fifty-seven articles from Europe, the USA, and Asia were identified. RALS was tried in large series in patients with different pathology and showed its values. However, there are still many controversies on its superiority, cost, and advantages. RALS is safe and efficient in experienced hands. It could be superior to conventional laparoscopic surgery (CLS). Its advantages in oncological outcomes over CLS are to be proven in structured randomized clinical trials (RCTs)
Vitamin D After Kidney Transplantation: Metabolism and Clinical Importance
No full textVitamin D (VD) is a key factor in calcium-phosphorus metabolism. In addition, it has increasing popularity due to its pleiotropic effects: renal protection, antineoplastic properties, and diabetes mellitus and hypertension control. The VD axis is severely impaired in chronic kidney disease. The changes are present even in the earliest stages and progress as kidney function worsens. Significant changes in VD occur after successful kidney transplantation, as different factors interplay, leading to widespread VD insufficiency in kidney transplant recipients. The aim of our review is to demonstrate the changes in VD metabolism after kidney transplantation and to reveal their full impact on graft and patient survival in the post-transplant setting. Furthermore, current strategies for VD supplementation and their efficacy will be discussed
REVIEW OF POWER SOURCES OF UNMANNED SURFACE VEHICLES
No full textThe article deals with small unmanned surface vehicles (USV), which main objective is exploration of seas and oceans as well as use for military purposes. The subject matter of this study is to analyze power sources providing power supply for all USVs power consuming units. There has been offered a review of actual-to-date USVs both of Russian and foreign manufacturing, which autonomous operation can last up to 3 months. The author has analyzed general characteristics of USVs, and paid special attention to the power sources and to consuming energy by the vehicles. Approximate total power obtained from USV electric sources makes 300-1000 W. It should be noted that USV electric power sources are not only accumulators and generators, but solar batteries and wind power generators. To save power USVs use sailing rigging, or apply wave glider’s technology where wave power is harvested to increase mobility of the vehicle. A distinctive feature of some USVs structure is placing solar batteries both on deck and on sales. A significant advantage of this structure is less power consumption at sufficient wind velocity and strengthening USV power system. There are considered not only single-hulled USVs, but also catamaran types (for gaining effective area to place additional solar batteries). Using data of USV structural features analysis, the author has inferred the factors influencing USV’s electric power system design, as well as perspectives of development of new types of unmanned crafts.</jats:p
Physalis undetermined
No full textPhysalis sp. MARTÍNEZ CROVETTO (1964: 22) reports that the Toba of the East call one Physalis, whose species the author does not identify, “tapañi”. It is doubtful whether the name belongs to this genus since, to our knowledge, the name “tapañi” is usually applied by diverse Toba and Pilagá communities to representatives of the genus Solanum L. (S. aridum Morong, S. elaeagnifolium Cav. and S. hieronymi Kuntze), which when have no flower or fruit can easily be mistaken by Physalis (ARENAS, 1992 -1993: 98; FILIPOV, 1992 -1993: 118). Likewise, CHASE SARDI (1977) claims that different species of Solanaceae are used by the Nivaclé for magical and medicinal purposes. They are applied by shamans in their initiation ceremonies, and are consumed in potions or are smoked. He includes Physalis among them, but the author provided no reliable identification. Finally, importance should be given to information coming from the Izoceño-Guarani people from the east of the Bolivian Chaco, who mention the fruits of several species of Physalis, P. viscosa among them, as animal feed and as a remedy (BOURDY, 2002: 147-149).Published as part of Arenas, Pastor & Kamienkowski, Nicolás Martín, 2013, Ethnobotany of the genus Physalis L. (Solanaceae) in the South American Gran Chaco, pp. 251-266 in Candollea 68 (2) on page 257, DOI: 10.15553/c2012v682a9, http://zenodo.org/record/574800
Short-term oral atrazine exposure alters the plasma metabolome of male C57BL/6 mice and disrupts α -linolenate, tryptophan, tyrosine and other major metabolic pathways
No full textOverexposure to the commonly used herbicide atrazine (ATR) affects several organ systems, including the brain. Previously, we demonstrated that short-term oral ATR exposure causes behavioral deficits and dopaminergic and serotonergic dysfunction in the brains of mice. Using adult male C57BL/6 mice, the present study aimed to investigate effects of a 10-day oral ATR exposure (0, 5, 25, 125, or 250 mg/kg) on the mouse plasma metabolome and to determine metabolic pathways affected by ATR that may be reflective of ATR’s effects on the brain and useful to identify peripheral biomarkers of neurotoxicity. Four h after the last dosing on day 10, plasma was collected and analyzed with high-performance, dual chromatography-Fourier-transform mass spectrometry that was followed by biostatistical and bioinformatic analyses. ATR exposure (≥5 mg/kg) significantly altered plasma metabolite profile and resulted in a dose-dependent increase in the number of metabolites with ion intensities significantly different from the control group. Pathway analyses revealed that ATR exposure strongly correlated with and disrupted multiple metabolic pathways. Tyrosine, tryptophan, linoleic acid and α-linolenic acid metabolic pathways were among the affected pathways, with α-linolenic acid metabolism being affected to the greatest extent. Observed effects of ATR on plasma tyrosine and tryptophan metabolism may be reflective of the previously reported perturbations of brain dopamine and serotonin homeostasis, respectively. ATR-caused alterations in the plasma profile of α-linolenic acid metabolism are a potential novel and sensitive plasma biomarker of ATR effect and plasma metabolomics could be used to better assess the risks, including to the brain, associated with ATR overexposure
