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Sample records for diameter metal seat

  1. A device for maintenance of large diameter metal seat plug valve; Dispositivo para manutencao de valvula macho de grande diametro com sede metal-metal

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Osmar Jose Leite da [PETROBRAS, Rio de Janeiro, RJ (Brazil)

    2003-07-01

    The present work is a PETROBRAS S.A. patent request, which presents an alternative for national technology in the metal seat Plug Valve maintenance area, widely used in Petrochemical plants. Before this device, the only alternative for national companies to accomplish a reliable maintenance was to ship of the valves to their makers abroad. However, the high cost and long shipping time made this kind of maintenance unfeasible. These factors led to the beginning of the research resulting in the device described here. The device assures the valves' seat-sealing reliability. This device has been successfully used by two national Refineries : 'Presidente Bernardes' Refinery and 'Planalto Paulista' Refinery. (author)

  2. Large-diameter metal-on-metal total hip arthroplasties: a page in orthopedic history?

    Science.gov (United States)

    Singh, Gurpal; Meyer, Heiko; Ruetschi, Marcel; Chamaon, Kathrin; Feuerstein, Bernd; Lohmann, Christoph H

    2013-11-01

    Large-diameter metal-on-metal (MoM) bearings evolved from the success of hip resurfacing. These implants were used in revision surgery in cases with well-fixed acetabular cups but loose or failed femoral stems, to avoid cup revision. Early data showed low rates of dislocation and potentially low wear profiles due to better fluid film lubrication. The risk of impingement was also thought to be low due to the increased head-neck ratio. Subsequently large-diameter MoM heads gained popularity in primary hip replacement. Recent data has emerged on the unacceptably high revision rates among patients with large-diameter MoM total hip arthroplasties (THAs), high blood levels of metal ions, and adverse tissue reactions. The head-neck (cone-taper) modular interface probably represents the weak link in large metal heads that have been used on conventional tapers. Increased torque of the large head, micromotion, and instability at the cone-taper interface, synergistic interactions between corrosion and wear, edge loading, low clearance, and psoas impingement are the likely causes for early failure of these prostheses. Copyright © 2013 Wiley Periodicals, Inc.

  3. Surgical Approach May Influence Survival of Large-Diameter Head Metal-on-Metal Total Hip Arthroplasty: A 6- to 10-Year Follow-Up Study

    Directory of Open Access Journals (Sweden)

    Chih-Chien Hu

    2017-01-01

    Full Text Available Large-diameter head (LDH metal-on-metal (MoM total hip arthroplasty (THA has lost popularity because of metal allergy or ALTRs (adverse local tissue reactions in the past decade. Whether the surgical approach may influence the survival of LDH-MoM-THA has not been reported. From 2006 to 2009, we performed 96 LDH-MoM-THAs on 80 patients using an in situ head-neck assembly technique through a modified Watson-Jones approach. With a mean follow-up of 8.4 years (range, 6.3–10.1 years, the implant survival rate was 100%. All patients were satisfied with the results and the Harris Hip Score improved from 52 points to 98 points. No ALTRs were found, but 17.7% of the 96 hips (17 adverse events experienced adverse events related to the cup, including 5 cases of outlier cup malposition, 11 cases of inadequate cup seating, and 1 acetabular fracture. The tissue tension that was improved by a muscle-sparing approach might lessen the chance of microseparation or edge-loading that is taken as the major risk for early implant failure. Further investigation of whether these LDH-MoM-THAs would fail or not would require a longer follow-up or even retrieval analysis in the future.

  4. Car Seat Safety

    Science.gov (United States)

    ... Staying Safe Videos for Educators Search English Español Car Seat Safety KidsHealth / For Parents / Car Seat Safety ... certified child passenger safety technician.) Guidelines for Choosing Car Seats Choose a seat with a label that ...

  5. Carbon nanotube diameter selection by pretreatment of metal catalysts on surfaces

    Science.gov (United States)

    Hauge, Robert H [Houston, TX; Xu, Ya-Qiong [Houston, TX; Shan, Hongwei [Houston, TX; Nicholas, Nolan Walker [South Charleston, WV; Kim, Myung Jong [Houston, TX; Schmidt, Howard K [Cypress, TX; Kittrell, W Carter [Houston, TX

    2012-02-28

    A new and useful nanotube growth substrate conditioning processes is herein disclosed that allows the growth of vertical arrays of carbon nanotubes where the average diameter of the nanotubes can be selected and/or controlled as compared to the prior art.

  6. Advanced terahertz electric near-field measurements at sub-wavelength diameter metallic apertures

    NARCIS (Netherlands)

    Adam, A.J.L.; Brok, J.M.; Seo, M.A.; Ahn, K.J.; Kim, D.S.; Kang, J.H.; Park, Q.H.; Nagel, M.; Planken, P.C.M.

    2008-01-01

    Using terahertz-light excitation, we have measured with sub-wavelength spatial, and sub-cycle temporal resolution the time- and frequency-dependent electric-field and surface-charge density in the vicinity of small metallic holes. In addition to a singularity like concentration of the electric field

  7. Conceptual design and selection of deposited metal on the valve seat for the high temperature isolation valve in the HTTR hydrogen production system (contract research)

    International Nuclear Information System (INIS)

    Nishihara, Tetsuo; Iwatsuki, Jin

    1999-11-01

    In the HTTR hydrogen production system a high temperature isolation valve should be provided outside the penetration of containment vessel on the secondary helium loop. As the secondary helium gas is at temperature of 905degC and pressure of 4.1 MPa, there is not any available isolation valve used under such conditions. Once demonstration test of high temperature isolation valve was carried out in the ERANS project. Tested valve could meet the basic design requirements but some problems remained. In this report a conceptual design of the high temperature isolation valve is performed in consideration of resolving these problems. The structural reliability is confirmed by the three-dimensional stress analysis. With respect to the deposited metal on valve seat, a screening test is done to observe the basic properties of candidate metals. From these results, it is shown that Stellite alloy that is used in practical valve has a possibility of the separation at welding layer and carbon diffusion from deposited metal into the base metal. Nickel-base super alloy has a possibility of internal and intergranular oxidation due to contained Al and Ti. Therefore, detail metallographical and mechanical tests for long period are planned to select the adequate deposited metal. (author)

  8. New 14-mm diameter Niti-S biliary uncovered metal stent for unresectable distal biliary malignant obstruction.

    Science.gov (United States)

    Kikuyama, Masataka; Shirane, Naofumi; Kawaguchi, Shinya; Terada, Shuzou; Mukai, Tsuyoshi; Sugimoto, Ken

    2018-01-16

    To investigate whether an uncovered self-expandable metal stent (UCSEMS) with a large diameter could prevent recurrent biliary obstruction (RBO). Thirty-eight patients with malignant biliary obstruction underwent treatment with an UCSEMS with a 14-mm diameter (Niti-S 14). Retrospectively, we evaluated technical and functional success rate, RBO rate, time to RBO, survival time, and adverse events in these patients. Stent placement success and functional success were achieved in all patients. Two patients (5.3%) had RBO due to tumor ingrowth or overgrowth. The median time to RBO was 190 (range, 164-215) d. The median survival time was 120 (range, 18-502) d. The 6-mo non-RBO rate was 91%. Other adverse events other than RBO occurred as follows: Acute cholecystitis, post-ERCP pancreatitis, hemobilia, and fever without exacerbation of liver injury, and liver abscess in 4 (10.3%), 3 (7.9%), 2 (5.3%), 1 (2.6%), and 1 (2.6%), respectively. Migration of the stents was not observed. Niti-S 14 is considered to be a preferable metal stent because of a low rate of RBO with no migration.

  9. Crowe Type I and II DDH managed by large diameter metal-on-metal total hip arthroplasty.

    Science.gov (United States)

    Yalcin, Nadir; Kilicarslan, Kasim; Cicek, Hakan; Kayaalp, Cetin; Yildirim, Hasan

    2011-01-01

    Large bearing metal-on-metal (MOM) total hip arthroplasty (THA) may offer advantages relating to stability and range of motion in patients with Crowe Type I and II developmental dysplasia of the hip (DDH). The purpose of this study was to provide an analysis of the clinical and radiological results of MOM THA in this context and compare the results with a cohort of patients treated with metal-on-polyethylene (MOP) bearing surfaces. 75 hips in 65 patients were treated with cementless MOM THA using large femoral heads (36-56 mm). The mean age of the patients was 47.4 years (29 to 59) and 54 were female. A group of 47 hips (41 patients) treated with conventional THA (screwed cup-polyethylene insert-28 mm head) was used for comparison. The study group was followed up for a mean of 62.1 months (32 to 76). No difference was found between the two groups in relation to improvement in Harris hip score (HHS) (43.1 to 90.3 points in the study group, 42.6 to 89.5 points in the control group, p>0.05). Although the preoperative range of motion in all planes were similar in both groups, the large head group demonstrated greater motion in all planes postoperatively, which was significant (all p=0.001). Additionally, there was a significant difference between groups in relation to the necessity for acetabular structural graft (8% and 31.9%, respectively; p=0.001). No major complications or adverse reactions to metal debris (ARMD) were observed in the study group. The results of large head MOM THA in young and active patients with DDH are similar to conventional THA at early follow-up, but the former offers the advantages of secure acetabular fixation without screws, greater range of motion, and lower risk of dislocation.

  10. Child Safety Seats

    Science.gov (United States)

    ... htm Child safety seats To use the sharing features on this page, please enable JavaScript. Child safety seats are proven to save children's lives in accidents. In the United States, all states require children to be secured in a car seat or booster seat until they reach certain ...

  11. Small diameter metal-on-metal total hip arthroplasty at 13 years - a follow-up study.

    Science.gov (United States)

    Tardy, N; Maqdes, A; Boisrenoult, P; Beaufils, P; Oger, P

    2015-12-01

    Theoretically, the properties of second-generation metal-on-metal (MoM) bearings are better for wear, osteolysis and longevity. However, follow-up studies of more than 10 years are rare, in particular with hybrid fixation (cemented stainless steel stems and cementless cup), therefore we evaluated the results of this combination after a mean follow-up of 12.8 years: (1) to analyze the survival rate, (2) to compare it with the survival rate in the same series after 6.4 years (95.8% cup, 94.8% stem), (3) to evaluate clinical and radiographic outcome and (4) to analyze these failures. The number of revisions would increase after 10 years. We evaluated 106 total hip arthroplasties (THA) (Cedior™ press-fit cup with cemented Acora™ (n=50) and Exafit™ (n=56) stems and 28mm Metasul™ bearings performed between January 1999 and December 2002. The survival rate was calculated by the Kaplan-Meier method. The clinical assessment included the Postel Merle d'Aubigné (PMA) and Oxford scores. The radiographic assessment evaluated radiolucencies and osteolysis on standard X-rays. A histological analysis was only performed during revision THA. After a mean 12.8 years of follow-up (10-16), 53 THA were reviewed in 48 patients. Thirteen THA revisions (14%) were performed including 11 aseptic revisions (5 stem fractures, 2 cases of impingement and 3 loosenings [1 bipolar and 3 cups] and one case of osteolysis). Overall survival, taking into account revision for aseptic loosening, was 87.6% (CI 95%=77.3 to 99.3%). The mean PMA and Oxford scores at the final follow-up were 17.6±0.8 points (16-18) and 16.5±5.2 points (12-38) respectively. The radiological follow-up mainly identified radiolucencies around the stem in Gruen zones 1 and 7 (17 and 21% respectively). The survival rate of hybrid MoM THA in this series decreased after 10 years and is lower than studies evaluating cementless THA with the 28-mm Metasul™ bearings (90.9 to 100% survival). Although the clinical results are

  12. Three-dimensional finite element analysis of stress distribution in a tooth restored with metal and fiber posts of varying diameters: An in-vitro study.

    Science.gov (United States)

    Kumar, Pradeep; Rao, R Nageswar

    2015-01-01

    To compare stress distribution in a tooth restored with metal and fiber posts of varying diameters (1.2 and 1.4 mm) by means of three-dimensional finite element analysis (3D-FEA). Four 3D-FEA models were constructed: (1) fiber post (1.2 and 1.4 mm) and (2) metal post (1.2 and 1.4 mm). The material properties were assigned and a force of 100 N was applied at 45° angle to the longitudinal axis of the tooth onto the palatal surface incisal to the cingulum. Analysis was run and stress distribution pattern was studied. Maximum stresses in the radicular tooth structure for fiber post were higher than that for metal post. In the former models, stresses in the tooth structure were slightly reduced with increase in fiber post diameter. To reduce stress in the remaining radicular tooth structure, it is better to use a fiber post of a large diameter.

  13. Analysis of Eddy Current Capabilities for the Detection of Outer Diameter Stress Corrosion Cracking in Small Bore Metallic Structures

    Science.gov (United States)

    Wincheski, Buzz; Williams, Phillip; Simpson, John

    2007-01-01

    The use of eddy current techniques for the detection of outer diameter damage in tubing and many complex aerospace structures often requires the use of an inner diameter probe due to a lack of access to the outside of the part. In small bore structures the probe size and orientation are constrained by the inner diameter of the part, complicating the optimization of the inspection technique. Detection of flaws through a significant remaining wall thickness becomes limited not only by the standard depth of penetration, but also geometrical aspects of the probe. Recently, an orthogonal eddy current probe was developed for detection of such flaws in Space Shuttle Primary Reaction Control System (PRCS) Thrusters. In this case, the detection of deeply buried stress corrosion cracking by an inner diameter eddy current probe was sought. Probe optimization was performed based upon the limiting spatial dimensions, flaw orientation, and required detection sensitivity. Analysis of the probe/flaw interaction was performed through the use of finite and boundary element modeling techniques. Experimental data for the flaw detection capabilities, including a probability of detection study, will be presented along with the simulation data. The results of this work have led to the successful deployment of an inspection system for the detection of stress corrosion cracking in Space Shuttle Primary Reaction Control System (PRCS) Thrusters.

  14. Effect of Molding and Machining on Neoflon CTFE M400H Polychlorotrifluoroethylene Rod Stock and Valve Seat Properties

    Science.gov (United States)

    Waller, Jess M.; Newton, Barry E.; Beeson, Harold D.

    2003-01-01

    Since 1997 numerous fires have been reported to the Food and Drug Administration involving cylinder valves installed on medical use oxygen cylinders sold and operated within the United States. All of the cylinder valves in question had polychlorotrifluoroethylene (PCTFE) valve seats. Subsequent failure analysis showed that the main seat was the primary source of ignition. A review of the incidents involving cylinder valve fires indicated three possible ignition mechanisms: contaminant promotion, flow friction, and resonance. However, gas purity analysis showed that uncombusted, residual oxygen was within specification. Infrared and energy dispersive spectroscopy further showed that no contaminants or organic compounds were present in the remaining, uncombusted valve seat material or on seat plug surfaces. Therefore, contaminant-promoted ignition did not appear to be responsible for the failures. Observations of extruded material along the outer edge of the coined or loaded seat area produced by cylinder overuse or poppet overload led to concerns that accelerated gas flow across a deformed seat surface could generate enough localized heating to ignite the polymeric seat. Low molecular weight or highly amorphous quick-quenched PCTFE grades might be expected to be especially prone to this type of deformation. Such a failure mechanism has been described as flow friction; however, the corresponding mechanistic parameters are poorly understood. Subsequent revelation of low-temperature dimensional instability by thermomechanical analysis (TMA) in a variety of PCTFE sheet and rod stock samples led to new concerns that PCTFE valve seats could undergo excessive expansion or contraction during service. During expansion, additional extrusion and accompanying flow friction could occur. During contraction, a gap between the seal and adjacent metal surfaces could form. Gas flowing past the gap could, in turn, lead to resonance heating and subsequent ignition as described in ASTM

  15. Misuse of car safety seats.

    Science.gov (United States)

    Bull, M J; Stroup, K B; Gerhart, S

    1988-01-01

    Correct use of car seats for small children is essential to prevent serious injuries and death from automotive accidents. Failure to use a car seat properly can contribute to serious injury or death of a child. A case study in which misuse of a car seat occurred is reported. The infant died of hemorrhage and shock secondary to liver laceration which resulted from excessive pressure over the abdomen sustained on impact. Surveys of car seat use for small children prior to and following a child restraint law are also reported. Observers noted types of car seats and specific forms of misuse. Survey results suggest that parents are more likely to misuse car seats for infants than toddlers. Medical professionals can reinforce the importance of proper car seat use by incorporating specific car seat use questions into the patient interview and by providing educational materials.

  16. 49 CFR 571.209 - Standard No. 209; Seat belt assemblies.

    Science.gov (United States)

    2010-10-01

    .... Hardware means any metal or rigid plastic part of a seat belt assembly. Load-limiter means a seat belt... usage a person, clothing, or webbing shall be free from burrs and sharp edges. (e) Release. A Type 1 or... seating position(s), e.g., “front right”] in [insert specific vehicle make(s) and model(s)]. (l) Usage and...

  17. AAP Updates Recommendations on Car Seats

    Science.gov (United States)

    ... Size Email Print Share AAP Updates Recommendations on Car Seats Page Content Article Body Children should ride ... of approved car safety seats. Healthy Children Radio: Car Seat Safety Dennis Durbin, MD, FAAP, lead author ...

  18. Take your seats: Leftward asymmetry in classroom seating choice

    Directory of Open Access Journals (Sweden)

    Victoria Lynn Harms

    2015-08-01

    Full Text Available Despite an overall body symmetry, human behaviour is full of examples of asymmetry, from writing or gesturing to kissing and cradling. Prior research has revealed that theatre patrons show a bias towards sitting on the right side of a movie theatre. Two competing theories have attempted to explain this seating asymmetry: one posits that expectation of processing demand drives the bias; the other posits that basic motor asymmetries drive the bias. To test these theories we assessed the real-world classroom seating choices of university students using photographs. A bias for students to choose seats on the left side of the classroom was observed, in contrast to the right side bias observed in theatre seating studies. These results provide evidence in support of a processing-expectation bias.

  19. Comfort model for automobile seat.

    Science.gov (United States)

    da Silva, Lizandra da; Bortolotti, Silvana Ligia Vincenzi; Campos, Izabel Carolina Martins; Merino, Eugenio Andrés Díaz

    2012-01-01

    Comfort on automobile seats is lived daily by thousands of drivers. Epistemologically, comfort can be understood under the theory of complexity, since it emerges from a chain of interrelationships between man and several elements of the system. This interaction process can engender extreme comfort associated to the feeling of pleasure and wellbeing or, on the other hand, lead to discomfort, normally followed by pain. This article has for purpose the development of a theoretical model that favours the comfort feature on automobile seats through the identification of its facets and indicators. For such, a theoretical study is resorted to, allowing the mapping of elements that constitute the model. The results present a comfort model on automobile seats that contemplates the (physical, psychological, object, context and environment) facets. This model is expected to contribute with the automobile industry for the development of improvements of the ergonomic project of seats to increase the comfort noticed by the users.

  20. Lightweight Seat Lever Operation Characteristics

    Science.gov (United States)

    Rajulu, Sudhakar

    1999-01-01

    In 1999, a Shuttle crew member was unable to operate the backrest lever for the lightweight seat in microgravity. It is essential that crew members can adjust this backrest lever, which is titled forward during launch and then moved backward upon reaching orbit. This adjustment is needed to cushion the crew members during an inadvertent crash landing situation. JSCs Anthropometry and Biomechanics Facility (ABF) performed an evaluation of the seat controls and provided recommendations on whether the seat lever positions and operations should be modified. The original Shuttle seats were replaced with new lightweight seats whose controls were moved, with one control at the front and the other at the back. The ABF designed a 12-person experiment to investigate the amount of pull force exerted by suited subjects, when controls were placed in the front and back of the lightweight seat. Each subject was asked to perform the pull test at least three times for each combination of lever position and suit pressure conditions. The results showed that, in general, the subjects were able to pull on the lever at the back position with only about half the amount of force that they were able to exert on the lever at the front position. In addition, the results also showed that subjects wearing the pressurized suit were unable to reach the seat lever when it was located at the back. The pull forces on the front lever diminished about 50% when subjects wore pressurized suits. Based on these results from this study, it was recommended that the levers should not be located in the back position. Further investigation is needed to determine whether the levers at the front of the seat could be modified or adjusted to increase the leverage for crew members wearing pressurized launch/escape suits.

  1. An Ergonomic Evaluation of Aircraft Pilot Seats

    Science.gov (United States)

    Andrade, Yolanda Nicole

    Seat comfort has become increasingly important in today's society as we spend more time at consoles, instrument panels, or just online. However, seat comfort is hard to define and difficult to measure. Several measures both objective and subjective were used to evaluate seat comfort in commercially available average pilot seats. Three pilot seats, which had the same material and similar adjustments but different physical attributes, and a universal classroom seat, with different material and no adjustments, were compared by 20 volunteers using subjective and objective measures in a Latin square controlled repeated measures design. A Friedman's test was used to determine that both the comfort questionnaire and the body-map rating results were able to discriminate objective comfort levels between the seats. One-way repeated measures ANOVA tests were used to analyze both the objective tests, actigraph and pressure pad data. All results indicated that one seat was clearly the most comfortable and another, the classroom seat was clearly the most uncomfortable seat. Furthermore, the overall comments per seat were compiled and compared to Fazlollahtabar's 2010) predictive automobile seat comfort theory to determine which factors influence comfort perception. The use of both subjective and objective data can better distinguish comfort from one seat over the other. These results have implications for future tests of seats that will be used for long durations. Limitations and future recommendations are discussed later in the paper. An interesting finding may explain why pressure pad data are typically seemingly at odds with subjective measures of seat comfort.

  2. Failure Diameter Resolution Study

    Energy Technology Data Exchange (ETDEWEB)

    Menikoff, Ralph [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2017-12-19

    Previously the SURFplus reactive burn model was calibrated for the TATB based explosive PBX 9502. The calibration was based on fitting Pop plot data, the failure diameter and the limiting detonation speed, and curvature effect data for small curvature. The model failure diameter is determined utilizing 2-D simulations of an unconfined rate stick to find the minimum diameter for which a detonation wave propagates. Here we examine the effect of mesh resolution on an unconfined rate stick with a diameter (10mm) slightly greater than the measured failure diameter (8 to 9 mm).

  3. Seat belt misuse among children transported in belt-positioning booster seats.

    Science.gov (United States)

    O'Neil, Joseph; Daniels, Dawn M; Talty, Judith L; Bull, Marilyn J

    2009-05-01

    Observe and report seat belt use among children transported in belt-positioning booster seats. We conducted a cross-sectional, observational survey of children transported in motor vehicles between 2006 and 2007. While drivers completed a survey reporting the child's age, weight and gender, and the driver's age, gender, race, income, education, and relationship to the child; a child passenger safety technician recorded vehicle seating location, restraint type, and use of the car safety seat harness or seat belt as appropriate for the child. Twenty-five fast food restaurants and discount department stores throughout Indiana. A convenience sample of drivers transporting children younger than 16 years. Seat belt use among children transported in belt-positioning booster seats. Seat belt misuse. Overall, 1446 drivers participated, 2287 children were observed with 564 children in belt-positioning booster seats. At least one seat belt misuse was observed for 64.8% of the children transported. Common misuses were the shoulder belt being placed over the booster seat armrest (35.8%); shoulder belt not at mid-shoulder position (28.5%), seat belt was too loose (24.5%), and the shoulder belt was either behind the child's back (9.1%) or under their arm (10.0%). There is a high frequency of seat belt misuses among children transported in booster seats. Advice to parents on appropriate car seat selection, and encouragement to parents to supervise seat belt use may decrease misuse.

  4. Physicist Wins Open Illinois Seat

    Indian Academy of Sciences (India)

    American Association for the Advancement of Science

    2008-04-09

    Apr 9, 2008 ... Fermi National Accelerator Laboratory (Fermi- lab) in Batavia, Illinois, won a special election to fill the seat held by former House Majority. Leader Dennis Hastert in a race that attracted national attention. And hundreds of scientists around the country gave their time and money to help put Foster over the top.

  5. NASA Standards Inform Comfortable Car Seats

    Science.gov (United States)

    2014-01-01

    NASA developed standards, which included the neutral body posture (NBP), to specify ways to design flight systems that support human health and safety. Nissan Motor Company, with US offices in Franklin, Tennessee, turned to NASA's NBP research for the development of a new driver's seat. The 2013 Altima now features the new seat, and the company plans to incorporate the seats in upcoming vehicles.

  6. Stadium seating--a market analysis.

    Science.gov (United States)

    Jerry A. Sesco; Edwin Kallio

    1967-01-01

    This report describes the characteristics of stadiums and seating in six North Central States; summarizes the purchasing methods for stadium seats; presents estimates of the present and future market; and points out the increasing competition to wood stadium seating form substitute materials.

  7. Applications of Mechatronics in Seating Furniture

    Directory of Open Access Journals (Sweden)

    Hynek Maňák

    2014-01-01

    Full Text Available Mechatronics is gradually being used in different fields of the production process and final products. In the field of home seating furniture, it has not been formally declared as such yet. The purpose of further development of seating furniture is to improve its ergonomic parameters, to improve user comfort in controlling and using seating furniture or to provide new additional functions of seating furniture. Application of mechatronic principles can be presumed within the framework of this development. An analysis of the current state of reclining seating furniture, which uses mechanical and electromechanical positioning mechanisms, is conducted in order to formulate possible fields of applying mechatronics. The analysis defines individual ergonomic parameters which are influenced in reclining of seating furniture. This analysis is used as a basis for formulating a hypothesis describing potential development fields of applying mechatronics in home seating furniture.

  8. 76 FR 53660 - Federal Motor Vehicle Safety Standards; Seat Belt Assemblies

    Science.gov (United States)

    2011-08-29

    ... insertion of a cylinder 10 mm in diameter and 38 mm in length to at least the midpoint of the cylinder along the cylinder's entire length in the actuation portion of the buckle release. A buckle having other... a child almost got strangled by a seat belt. The petitioner further suggested there is a demand for...

  9. Energy-Absorbing Passenger Seat for Aircraft

    Science.gov (United States)

    Eichelberger, C. P.; Alfaro-Bou, E.; Fasanella, E. L.

    1987-01-01

    Development of energy-absorbing passenger seat, designed to minimize injury in commercial-aircraft crash, part of joint FAA/NASA controlledimpact flight test of transport-category commercial aircraft. Modified seat mechanism collapses under heavy load to absorb impact energy and thereby protect passenger. Results of simulation tests indicate probability of passenger survival high. Proposed seat mechanism mitigates passenger injuries by reducing impact forces in crash.

  10. Drive alive: teen seat belt survey program.

    Science.gov (United States)

    Burkett, Katie M; Davidson, Steve; Cotton, Carol; Barlament, James; Loftin, Laurel; Stephens, James; Dunbar, Martin; Butterfield, Ryan

    2010-08-01

    To increase teen seat belt use among drivers at a rural high school by implementing the Drive Alive Pilot Program (DAPP), a theory-driven intervention built on highway safety best practices. The first component of the program was 20 observational teen seat belt surveys conducted by volunteer students in a high school parking lot over a 38-month period before and after the month-long intervention. The survey results were published in the newspaper. The second component was the use of incentives, such as gift cards, to promote teen seat belt use. The third component involved disincentives, such as increased police patrol and school policies. The fourth component was a programmatic intervention that focused on education and media coverage of the DAPP program. Eleven pre-intervention surveys and nine post-intervention surveys were conducted before and after the intervention. The pre- and post-intervention seat belt usage showed significant differences (p<0.0001). The average pre-intervention seat belt usage rate was 51.2%, while the average post-intervention rate was 74.5%. This represents a percentage point increase of 23.3 in seat belt use after the DAPP intervention. Based on seat belt observational surveys, the DAPP was effective in increasing seat belt use among rural high school teenagers. Utilizing a theory-based program that builds on existing best practices can increase the observed seat belt usage among rural high school students.

  11. Simulation of human seated postures and dynamic seat interaction in impact conditions

    NARCIS (Netherlands)

    Happee, R.; Verver, M.M.; Lange, R. de

    2000-01-01

    Prediction and assessment of seated postures are essential for ergonomic vehicle design whereas dynamic seat interactions are essential for impact conditions. This paper presents seat models and human models for both applications. An interface has been developed to convert RAMSIS human models and

  12. Electrical Connector Mechanical Seating Sensor

    Science.gov (United States)

    Arens, Ellen; Captain, Janine; Youngquist, Robert

    2011-01-01

    A sensor provides a measurement of the degree of seating of an electrical connector. This sensor provides a number of discrete distances that a plug is inserted into a socket or receptacle. The number of measurements is equal to the number of pins available in the connector for sensing. On at least two occasions, the Shuttle Program has suffered serious time delays and incurred excessive costs simply because a plug was not seated well within a receptacle. Two methods were designed to address this problem: (1) the resistive pin technique and (2) the discrete length pins technique. In the resistive pin approach, a standard pin in a male connector is replaced with a pin that has a uniform resistivity along its length. This provides a variable resistance on that pin that is dependent on how far the pin is inserted into a socket. This is essentially a linear potentiometer. The discrete approach uses a pin (or a few pins) in the connector as a displacement indicator by truncating the pin length so it sits shorter in the connector than the other pins. A loss of signal on this pin would indicate a discrete amount of displacement of the connector. This approach would only give discrete values of connector displacement, and at least one pin would be needed for each displacement value that would be of interest.

  13. Using haptic feedback to increase seat belt use : traffic tech.

    Science.gov (United States)

    2011-07-01

    The legacy of research on increasing seat belt use has : focused on enactment of seat belt legislation, public education, : high-visibility police enforcement, and seat belt : reminder systems. Several behavioral programs have : produced large, susta...

  14. The dynamic response of human subjects while seated in car seats.

    Science.gov (United States)

    Pope, M H; Magnusson, M; Broman, N H; Hasson, T

    1998-01-01

    A pendulum impact method was used to establish the dynamic response of the seated subject. Threaded K wires were placed in the L3 spinous process. The gain and phase angle between the platform and the vertebra were established. The response of the subject was observed while seated on a platform and a variety of other seats. The seats were found to be very important in the attenuation of the impulse, leading to a higher transmissibility. Clinical Relevance Skeletal impact through the lower extremity is quite common in many occupations. The importance of posture and seat design in attenuation of impulses has been established.

  15. Rear-facing car seat (image)

    Science.gov (United States)

    A rear-facing car seat position is recommended for a child who is very young. Extreme injury can occur in an accident because ... child. In a frontal crash a rear-facing car seat is best, because it cradles the head, ...

  16. Developing the tissue viability seating guidelines.

    Science.gov (United States)

    Stephens, Melanie; Bartley, Carol; Betteridge, Ria; Samuriwo, Ray

    2018-02-01

    Costs for the prevention and management of pressure ulcers have increased significantly with limited published advice from health and social care organisations on seating and preventing pressure ulcers. At the request of the UK Tissue Viability Society the aim of the publication was to develop a practical guide for people, carers and health and social care professionals on how the research and evidence base on pressure ulcer prevention and management can be applied to those who remain seated for extended periods of time. The evidence base informing the guidelines was obtained by applying a triangulation of methods: a literature review, listening event and stakeholder group consultation. The purpose was to engage users and carers, academics, clinicians, inspectorate and charities, with an interest in seating, positioning and pressure management to: gather views, feedback, stories, and evidence of the current practices in the field to create a greater awareness of the issue. The new guidelines are inclusive of all people with short and long-term mobility issues to include all population groups. The document includes evidence on where pressure ulcers develop when seated, risk factors, best possible seated position and what seat adjustments are required, the ideal seating assessment, interventions, self-help suggestions and key seating outcomes. The updated TVS CPGs have been informed by the best available evidence, the insights and wisdom of experts, stakeholders and people who spend extended periods of time sitting. Copyright © 2017 The Authors. Published by Elsevier Ltd.. All rights reserved.

  17. Technical note: Spine loading in automotive seating

    NARCIS (Netherlands)

    Zenk, R.; Franz, M.; Bubb, H.; Vink, P.

    2012-01-01

    For car manufacturers, seat comfort is becoming more important in distinguishing themselves from their competitors. Therefore, many studies on participative seat comfort are carried out. In this paper, an objective assessment approach is reported which evaluates the concept of "optimal load

  18. Seat Belts on School Buses: Some Considerations.

    Science.gov (United States)

    Soule, David

    1982-01-01

    A representative of the National Highway Traffic Safety Administration weighs advantages and discusses issues associated with installing seat belts in school buses. Federal regulations and research findings are considered. A list of guideline questions for school districts planning to install seat belts is included. (PP)

  19. Metallic beryllium-7 target of small diameter

    CERN Document Server

    Zyuzin, A Yu; Vincent, J S; Buckley, K R; Bateman, N P; Snover, K A; Csandjan, J M; Steiger, T D; Adelberger, E G; Swanson, H E

    1999-01-01

    The stellar sup 7 Be(p, gamma) sup 8 B reaction rate has the largest uncertainty among all nuclear reaction rates in the standard solar model. However, the solar neutrino flux predicted for the majority of proposed and existing solar neutrino detectors is directly dependent on the rate of sup 7 Be(p, gamma) sup 8 B reaction. The existing solar neutrino detectors measure rate of sup 8 B decay neutrinos that is too low. This constitutes largely the solar neutrino problem. Existing measurements of the sup 7 Be(p, gamma) sup 8 B reaction rate disagree with one another, indicating the need for more precise experiments. To provide the required targets a new procedure for sup 7 Be production, separation and target manufacturing has been developed. First, a lithium target has been designed for sup 7 Be production at TRIUMF's 13 MeV cyclotron. The lithium target has been extensively tested at 50 mu A proton beam current yielding 8.1 MBq/mu A h of sup 7 Be. An adsorption filtration technique has been developed for sup ...

  20. Differences in the kinematics of booster-seated pediatric occupants using two different car seats.

    Science.gov (United States)

    Juste-Lorente, O; Maza, M; Lorente, A I; Lopez-Valdes, F J

    2018-01-02

    The objective of this article is to compare the performance of forward-facing child restraint systems (CRS) mounted on 2 different seats. Two different anthropomorphic test device (ATD) sizes (P3 and P6), using the same child restraint system (a non-ISOFIX high-back booster seat), were exposed to the ECE R44 regulatory deceleration pulse in a deceleration sled. Two different seats (seat A, seat B) were used. Three repetitions per ATD and mounting seat were done, resulting in a total of 12 sled crashes. Dummy sensors measured the head tri-axial acceleration and angular rate and the thorax tri-axial acceleration, all acquired at 10,000 Hz. A high-speed video camera recorded the impact at 1,000 frames per second. The 3D kinematics of the head and torso of the ATDs were captured using a high-speed motion capture system (1,000 Hz). A pair-matched statistical analysis compared the outcomes of the tests using the 2 different seats. Statistically significant differences in the kinematic response of the ATDs associated with the type of seat were observed. The maximum 3 ms peak of the resultant head acceleration was higher on seat A for the P3 dummy (54.5 ± 1.9 g vs. 44.2 ± 0.5 g; P =.012) and for the P6 dummy (56.0 ± 0.8 g vs. 51.7 ± 1.2 g; P =.015). The peak belt force was higher on seat A than on seat B for the P3 dummy (5,488.0 ± 198.0 N vs. 4,160.6 ± 63.6 N; P =.008) and for the P6 dummy (7,014.0 ± 271.0 N vs. 5,719.3 ± 37.4 N; P =.015). The trajectory of the ATD head was different between the 2 seats in the sagittal, transverse, and frontal planes. The results suggest that the overall response of the booster-seated occupant exposed to the same impact conditions was different depending on the seat used regardless of the size of the ATD. The differences observed in the response of the occupants between the 2 seats can be attributed to the differences in cushion stiffness, seat pan geometry, and belt geometry. However, these results were obtained for 2

  1. Environmental and psychosocial factors affecting seat belt use among Turkish front-seat occupants in Ankara: two observation studies.

    Science.gov (United States)

    Simşekoğlu, Ozlem; Lajunen, Timo

    2008-01-01

    Low seat belt use rate among car occupants is one of the main problems contributing to low driver and passenger safety in Turkey, where injury and fatality rates of car occupants are very high in traffic crashes. The present article consists of two observation studies, which were conducted in Ankara. The first study aimed at investigating environmental factors and occupant characteristics affecting seat belt use among front-seat occupants, and the objective of the second study was to investigate the relationship between driver and front-seat passenger seat belt use. In the first study, 4, 227 front-seat occupants (drivers or front seat passengers) were observed on four different road sides and, in the second study 1, 398 front seat occupants were observed in car parks of five different shopping centers in Ankara. In both observations, front-seat occupants' seat bet use (yes, no), sex (male, female), and age ( 50 years) were recorded. The data were analyzed using chi-square statistics and binary logistic regression techniques. Results of the first study showed that seat belt use proportion among observed front seat occupants was very low (25%). Being female and traveling on intercity roads were two main factors positively related to use a seat belt among front-seat occupants. High correlations between seat belt use of the drivers and front-seat passengers were found in the second study. Overall, low seat belt use rate (25%) among the front-seat occupants should be increased urgently for an improved driver and passenger safety in Turkey. Seat belt campaigns especially tailored for male front-seat occupants and for the front-seat occupants traveling on city roads are needed to increase seat belt use rates among them. Also, both drivers and passengers may have an important role in enforcing seat belt use among themselves.

  2. Drive Alive: Teen Seat Belt Survey Program

    Directory of Open Access Journals (Sweden)

    Loftin, Laurel

    2010-08-01

    Full Text Available Objective: To increase teen seat belt use among drivers at a rural high school by implementing the Drive Alive Pilot Program (DAPP, a theory-driven intervention built on highway safety best practices.Methods: The first component of the program was 20 observational teen seat belt surveys conducted by volunteer students in a high school parking lot over a 38-month period before and after the month-long intervention. The survey results were published in the newspaper. The second component was the use of incentives, such as gift cards, to promote teen seat belt use. The third component involved disincentives, such as increased police patrol and school policies. The fourth component was a programmatic intervention that focused on education and media coverage of the DAPP program.Results: Eleven pre-intervention surveys and nine post-intervention surveys were conducted before and after the intervention. The pre- and post-intervention seat belt usage showed significant differences (p<0.0001. The average pre-intervention seat belt usage rate was 51.2%, while the average post-intervention rate was 74.5%. This represents a percentage point increase of 23.3 in seat belt use after the DAPP intervention.Conclusion: Based on seat belt observational surveys, the DAPP was effective in increasing seat belt use among rural high school teenagers. Utilizing a theory-based program that builds on existing best practices can increase the observed seat belt usage among rural high school students. [West J Emerg Med. 2010; 11(3: 280-283.

  3. The Seated Soldier Study: Posture and Body Shape in Vehicle Seats

    Science.gov (United States)

    2014-01-28

    vehicle interior layout Current design guidance is based on outdated anthropometry Previous studies of seated anthropometry have not included the...personal protective equipment (PPE) for seat and vehicle interior layout • Current design guidance is based on outdated anthropometry • Previous...studies of seated anthropometry have not included the effects of PPE on posture and body shape • Detailed anthropometric data needed for the design

  4. Compliance with Seat Belt Use in Makurdi, Nigeria: An ...

    African Journals Online (AJOL)

    Background: Seat belts are designed to reduce injuries due to road crash among vehicle occupants. Aims: This study aims to determine the availability of seat belt in vehicles and compliance with seat belt use among vehicle occupants. Materials and methods: This was a 24‑h direct observational study of seat belt usage ...

  5. Digital Recovery Sequencer - Advanced Concept Ejection Seats

    National Research Council Canada - National Science Library

    Ross, David A; Cotter, Lee; Culhane, David; Press, Matthew J

    2005-01-01

    The Advanced Concept Ejection Seat (ACES) currently uses the Analog Sequencer, designed in the 1960's and 1970's with analog technology, to control ejection event timing and ejection mode selection...

  6. The dynamic response of human subjects while seated in car seats.

    OpenAIRE

    Pope, M. H.; Magnusson, M.; Broman, N. H.; Hasson, T.

    1998-01-01

    A pendulum impact method was used to establish the dynamic response of the seated subject. Threaded K wires were placed in the L3 spinous process. The gain and phase angle between the platform and the vertebra were established. The response of the subject was observed while seated on a platform and a variety of other seats. The seats were found to be very important in the attenuation of the impulse, leading to a higher transmissibility. Clinical Relevance Skeletal impact through the lower ext...

  7. Seat-belt message and the law?

    Science.gov (United States)

    Sengupta, S K; Patil, N G; Law, G

    1989-09-01

    This paper attempts to draw together available information on the use of seat belts, one of the most important safety devices for a person in a car. Considering the high rate of mortality and morbidity due to road traffic accidents in Papua New Guinea the authors strongly feel that seat-belt usage should be made compulsory. When one looks at the history of the implementation of such a successful countermeasure in other countries it seems that legislation is the only answer.

  8. Directed growth of diameter-tunable nanowires

    Energy Technology Data Exchange (ETDEWEB)

    Ozturk, Birol; Talukdar, Ishan; Flanders, Bret N [Department of Physics, Oklahoma State University, 145 Physical Sciences II, Stillwater, OK 74078 (United States)

    2007-09-12

    This study characterizes a method for controlling the nanowire diameter in the directed electrochemical nanowire assembly technique, where alternating voltages applied to electrodes in simple salt solutions induce the crystallization of metallic wires. Dendritic solidification is identified as an important component of this technique. A characteristic of dendritic solidification is that the growth velocity and tip radius are anti-correlated. This relationship is exploited here to realize diameter-tunable nanowire growth. The experimental parameter that provides this control is {omega}, the frequency of the alternating voltage. Increasing {omega} effectively steepens the metal cation concentration gradient at the wire-solution interface, thereby increasing the growth velocity of the wire. For indium wires, increasing {omega} from 0.5 to 3.5 MHz increases their growth velocity from 11 to 78 {mu}m s{sup -1} and reduces their diameter from 770 to 114 nm. Gold wires exhibit diameter-tunability that ranges from 150 nm to 45 nm. Thus, it is possible to tune the wire diameter from the microscale down to the nanoscale. Moreover, this control is a consequence of non-stationary dendritic growth, which distinguishes this process from most previously studied examples of dendritic solidification.

  9. 76 FR 31803 - Airworthiness Directives; Koito Industries, Ltd., Seats and Seating Systems Approved Under...

    Science.gov (United States)

    2011-06-02

    ... 16g, the test results indicate a level of safety higher than that of 9g-only seats. Cathay Pacific Airways and V Australia requested that the 2-year compliance time be extended to 4 years. Cathay Pacific... scheduled heavy maintenance checks. Cathay Pacific also noted it takes 18 to 24 months for a typical seat...

  10. 75 FR 34172 - Lordstown Seating Systems, a Subsidiary of Magna Seating, Including Workers Whose Unemployment...

    Science.gov (United States)

    2010-06-16

    ... certification for workers of the subject firm. The workers produce seating for automobiles. New information shows that some workers separated from employment at the subject firm had their wages reported under a... secondarily affected as a supplier of seating for automobiles to a TAA certified firm. The amended notice...

  11. Small diameter carbon nanopipettes

    Science.gov (United States)

    Singhal, Riju; Bhattacharyya, Sayan; Orynbayeva, Zulfiya; Vitol, Elina; Friedman, Gary; Gogotsi, Yury

    2010-01-01

    Nanoscale multifunctional carbon probes facilitate cellular studies due to their small size, which makes it possible to interrogate organelles within living cells in a minimally invasive fashion. However, connecting nanotubes to macroscopic devices and constructing an integrated system for the purpose of fluid and electrical signal transfer is challenging, as is often the case with nanoscale components. We describe a non-catalytic chemical vapor deposition based method for batch fabrication of integrated multifunctional carbon nanopipettes (CNPs) with tip diameters much smaller (10-30 nm) than previously reported (200 nm and above) and approaching those observed for multiwalled carbon nanotubes. This eliminates the need for complicated attachment/assembly of nanotubes into nanofluidic devices. Variable tip geometries and structures were obtained by controlled deposition of carbon inside and outside quartz pipettes. We have shown that the capillary length and gas flow rate have a marked effect on the carbon deposition. This gives us a flexible protocol, useful for growing carbon layers of different thicknesses at selective locations on a glass pipette to yield a large variety of cellular probes in bulk quantities. The CNPs possess an open channel for fluid transfer with the carbon deposited inside at 875 °C behaving like an amorphous semiconductor. Vacuum annealing of the CNP tips at temperatures up to 2000 °C yields graphitic carbon structures with an increase in conductivity of two orders of magnitude. Penetration of the integrated carbon nanoprobes into cells was shown to produce minimal Ca2+ signals, fast recovery of basal Ca2+ levels and no adverse activation of the cellular metabolism during interrogation times as long as 0.5-1 h.

  12. Resection of deep-seated gliomas using neuroimaging for stereotactic placement of guidance catheters

    Energy Technology Data Exchange (ETDEWEB)

    Matsumoto, Kengo; Higashi, Hisato; Tomita, Susumu; Furuta, Tomohisa; Ohmoto, Takashi [Okayama Univ. (Japan). School of Medicine

    1995-03-01

    A simple computed tomography- (CT) or magnetic resonance (MR) imaging-guided stereotactic method for guided microsurgical resection of either deep-seated gliomas or tumors adjacent to an eloquent area is described. The technique employs the Brown-Roberts-Wells stereotactic system and twist drills, 2.7 mm in diameter, for the stereotactic placement of 2.4 mm diameter scaled guidance catheters through the calvaria. In a patient with a deep-seated small glioma, less than 2 cm diameter, one catheter was implanted into the center of the enhanced mass through the cerebral cortex. In the other 14 patients, three to six catheters were used which made the tumor border clearer. After implantation of the guidance catheters, the stereotactic frame was removed and a standard open craniotomy performed. Target localization is not affected by brain movement, which is inevitable during open surgery. The tumor involved the frontal lobe in eight patients, the parietal lobe in two, and the thalamus in five. In all cases the lesion was quickly localized and radical removal was acheived. Neurological complications occurred in only one patient who suffered transient hemiparesis after the resection of a lesion in the pyramidal tract. The results demonstrate that microsurgery combined with CT- or MR imaging-guided stereotactic placement of guidance catheters is a new option for surgery of deep-seated gliomas or tumors adjacent to an eloquent area. (author).

  13. Europa Propulsion Valve Seat Material Testing

    Science.gov (United States)

    Addona, Brad M.

    2017-01-01

    The Europa mission and spacecraft design presented unique challenges for selection of valve seat materials that met the fluid compatibility requirements, and combined fluid compatibility and high radiation exposure level requirements. The Europa spacecraft pressurization system valves will be exposed to fully saturated propellant vapor for the duration of the mission. The effects of Nitrogen Tetroxide (NTO) and Monomethylhydrazine (MMH) propellant vapors on heritage valve seat materials, such as Vespel SP-1 and Polychlorotrifluoroethylene (PCTFE), were evaluated to determine if an alternate material is required. In liquid system applications, Teflon is the only available compatible valve seat material. Radiation exposure data for Teflon in an air or vacuum environment has been previously documented. Radiation exposure data for Teflon in an oxidizer environment such as NTO, was not available, and it was unknown whether the effects would be similar to those on air-exposed samples. Material testing was conducted by Marshall Space Flight Center (MSFC) and White Sands Test Facility (WSTF) to determine the effects of propellant vapor on heritage seat materials for pressurization valve applications, and the effects of combined radiation and NTO propellant exposure on Teflon. The results indicated that changes in heritage pressurization valve seat materials' properties rendered them unsuitable for the Europa application. The combined radiation and NTO exposure testing of Teflon produced results equivalent to combined radiation and air exposure results.

  14. Modelling and design of a novel air-spring for a suspension seat

    Science.gov (United States)

    Holtz, Marco W.; van Niekerk, Johannes L.

    2010-10-01

    Air-springs used in conjunction with auxiliary volumes provide both spring stiffness and damping. The damping is introduced through the flow restriction connecting the two air volumes. This article presents a simplified model of an air-spring with an auxiliary volume derived from first principles for simulation and design of an air-spring coupled to an auxiliary volume for a suspension seat. Tests were performed on an experimental apparatus to validate the model. The simulation model of the air-spring and auxiliary volume followed the trend predicted by the literature but showed approximately 27% lower transmissibility amplitude and 21% lower system natural frequency than that obtained by tests when using large diameter flow restrictions. This inaccuracy is assumed to be introduced by the simplified mass transfer equations defining the flow restriction between air-spring and auxiliary volume. The model showed closer correlation to the experimental results when the auxiliary volume size was decreased by two-thirds of the volume actually used for the experiment. A procedure, using the developed simulation model, for the design of a prototype air-spring and auxiliary volume, is presented for application in a typical articulated or rigid frame dump truck. The goal of the study was to design a suspension seat for this application and to obtain a SEAT value below 1.1. The design was optimised by varying auxiliary volume size and flow restriction diameters for different loads. A SEAT value of less than 0.9 was achieved, clearly indicating the effectiveness of using an auxiliary volume with an air-spring as seat suspension.

  15. SEAT: A strategic engagement analysis tool

    Energy Technology Data Exchange (ETDEWEB)

    Dreicer, J.; Michelsen, C.; Morgeson, D.

    1988-01-01

    The Strategic Engagement Analysis Tool (SEAT) is a prototype of an expert system knowledge-based discrete event simulation. SEAT realistically represents the interrelationships between the eight major subsystems in the strategic targeting and assault domain. Some of the subsystems employ run-time cognitive decision making and reasoning capabilities to represent human tactical and operational strategy decisions. SEAT's goal is to allow analysts to conduct sensitivity analysis and to determine cause-effect relationships. An intelligent interface mechanism is provided to aid the analyst in scenario creation. The interface was designed to provide on-line documentation, support for model input, logic control, and data validation prior to simulation execution. 4 refs., 3 figs.

  16. International survey of seat belt use exemptions.

    Science.gov (United States)

    Weiss, H; Sirin, H; Levine, J A; Sauber, E

    2006-08-01

    Substantial evidence of seatbelt efficacy has been shown by several studies, and it is widely recommended that motor vehicle occupants use properly fitted seat belts. However, some (but a heretofore unknown number of) countries with national seat belt laws permit various exemptions which may lower use rates. The aim of this study was to survey the variety of exemptions to national seat belt laws. This investigation relied on identifying respondents from national traffic safety agencies, other governmental and non-governmental organizations, Internet searches, personal contacts, and other sources. Questionnaires were deployed through a web based survey supplemented by email and postal versions. Responses were received from 30 countries of which 28 (93.7%) had a national seat belt law. About two thirds (63.7%) of the 28 national laws applied to both front and back seat passengers. The leading exemption types included vehicles made before a certain year (n = 13), antique vehicles (n = 12), military vehicles (n = 11), buses (n = 9), and emergency vehicles (n = 8). Most responding countries reported one or more specific categories of individuals as exempt including those with medical exemptions (n = 20), taxi drivers (n = 11), police (n = 9), emergency medical personnel (n = 8), physically disabled people (n = 6), and pregnant women (n = 6). Out of 26 responses to the question regarding current level of enforcement, 42.3% felt enforcement was "very good or good" and 57.7% characterized it as "fair or poor". This study represents one of the largest international traffic law surveys reported. Most national seatbelt laws offer perilous exemptions to a broad array of vehicle types and road user groups. These findings, coupled with concern over the level of enforcement in the majority of countries surveyed, suggest that international road safety efforts have a long way to go to improve coverage and enforcement of national seat belt laws.

  17. The DIAMET campaign

    Science.gov (United States)

    Vaughan, G.

    2012-04-01

    DIAMET (DIAbatic influences on Mesoscale structures in ExTratropical storms) is a joint project between the UK academic community and the Met Office. Its focus is on understanding and predicting mesoscale structures in synoptic-scale storms, and in particular on the role of diabatic processes in generating and maintaining them. Such structures include fronts, rain bands, secondary cyclones, sting jets etc, and are important because much of the extreme weather we experience (e.g. strong winds, heavy rain) comes from such regions. The project conducted two field campaigns in the autumn of 2011, from September 14 - 30 and November 24 - December 14, based around the FAAM BAe146 aircraft with support from ground-based radar and radiosonde measurements. Detailed modelling, mainly using the Met Office Unified model, supported the planning and interpretation of these campaigns. This presentation will give a brief overview of the campaigns. Both in September and November-December the weather regime was westerly, with a strong jet stream directed across the Atlantic. Three IOPs were conducted in September, to observe a convective band ahead of an upper-level trough, waves on a long trailing cold front, and a warm conveyor belt associated with a secondary cyclone. In November-December six IOPs were conducted, to observe frontal passages and high winds. This period was notable for a number of very strong windstorms passing across the north of the UK, and gave us an opportunity to examine bent-back warm fronts in the southern quadrant of these storms where the strongest winds are found. The case studies fell into two basic patterns. In the majority of cases, dropsonde legs at high level were used to obtain a cross-section of winds and thermodynamic structure (e.g. across a front), followed by in situ legs at lower levels (generally where the temperature was between 0 and -10°) to examine microphysical processes, especially ice multiplication and the extent of supercooled water

  18. Civil aircraft side-facing seat research summary.

    Science.gov (United States)

    2012-11-01

    The Federal Aviation Administration (FAA) has standards and regulations that are intended to protect aircraft : occupants in the event of a crash. However, side-facing seats were not specifically addressed when aircraft seat : dynamic test standards ...

  19. Joint overbooking and seat allocation for fare families

    DEFF Research Database (Denmark)

    Hjorth, Robert; Fiig, Thomas; Bondoux, Nicolas

    2016-01-01

    Revenue Management Systems (RMS) traditionally solve the seat allocation problem separately from the overbooking problem. Overbooking is managed by inflating the authorization levels obtained from seat allocation by various heuristics. This approach although suboptimal, is necessitated because of...

  20. 49 CFR 571.10 - Designation of seating positions.

    Science.gov (United States)

    2010-10-01

    ...) Number of designated seating positions. The formula for calculating the number of designated seating... located using the SAE three-dimensional H-point machine per Society of Automotive Engineers (SAE) Surface...

  1. Research on an Active Seat Belt System

    Science.gov (United States)

    Kawashima, Takeshi

    In a car crash, permanent injury can be avoided if deformation of an occupant's rib cage is maintained within the allowable value. In order to realize this condition, the occupant's seat belt tension must be instantaneously adjusted by a feedback control system. In this study, a seat belt tension control system based on the active shock control system is proposed. The semi-active control law used is derived from the sliding mode control method. One advantage of this proposed system is that it does not require a large power actuator because the seat belt tension is controlled by a brake mechanism. The effectiveness is confirmed by numerical simulation using general parameters of a human thorax and a passenger car in a collision scenario with a wall at a velocity of 100 km/h. The feasibility is then confirmed with a control experiment using a scale model of about 1/10 scale. The relative displacement of the thorax model approaches the allowable value smoothly along the control reference and settles near this value. Thus, the proposed seat belt tension control system design is established.

  2. Differences in mean fibre diameter and fibre diameter variance in ...

    African Journals Online (AJOL)

    sampled at five different body locations (Figure 1) at an age of 15 months. Samples were analysed by the Wool Testing. Bureaux, using an Optical Fibre Diameter Analyser which measured 4000 individual fibres in each sample. Apart from the mean, the variance of fibre diameter within samples was available. The statistical ...

  3. 75 FR 58340 - Airworthiness Directives; Koito Industries, Ltd., Seats and Seating Systems Approved Under...

    Science.gov (United States)

    2010-09-24

    ... assessment is valid, the seats in question must be shown to incorporate any specific design features or..., a lumbar load test is required. 3. Predicated on design philosophy being maintained for safety...

  4. Percentage of Drivers and Front Seat Passengers Wearing Seat Belts, 2012 & 2014, All States

    Data.gov (United States)

    U.S. Department of Health & Human Services — Source for 2012 national data: National Occupant Protection Use Survey (NOPUS), 2012. Source for 2012 state data: State Observational Survey of Seat Belt Use, 2012....

  5. 49 CFR 571.207 - Standard No. 207; Seating systems.

    Science.gov (United States)

    2010-10-01

    ... standard establishes requirements for seats, their attachment assemblies, and their installation to....2. General performance requirements. When tested in accordance with S5, each occupant seat shall... than a school bus; a passenger seat on a school bus with a GVWR greater than 4,536 kilograms (10,000...

  6. Classroom Seating Considerations for 21st Century Students and Faculty

    Science.gov (United States)

    Harvey, Eugene J.; Kenyon, Melaine C.

    2013-01-01

    This quantitative, cross-sectional research study explored students' perceptions of five different seating styles within typical classrooms in an urban public higher education institution. The five seating styles included: modern mobile chairs, tablet arm chairs, fixed tiered seating with tablet arms, rectangle tables with standard chairs, and…

  7. Wheel Diameter and Speedometer Reading

    Science.gov (United States)

    Murray, Clifton

    2010-01-01

    Most introductory physics students have seen vehicles with nonstandard wheel diameters; some may themselves drive "low-rider" cars or "big-wheel" pickup trucks. But how does changing wheel diameter affect speedometer readout for a given speed? Deriving the answer can be followed readily by students who have been introduced to rotation, and it…

  8. Results of the supplementary work to the fiscal 1994 New Sunshine Project. Development of geothermal power plants, etc. (development of production, technology for deep-seated geothermal resources); 1994 nendo new sunshine keikaku hojo jigyo seika hokokusho. Nessui riyo hatsuden plant to kaihatsu (shinbu chinetsu shigen saishu gijutsu no kaihatsu shinbu chinetsu shigen seisan gijutsu no kaihatsu)

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1995-03-01

    The paper reports on the fiscal 1994 results of the study of the development of a technology for collecting deep-seated geothermal resources, which has been made for increasing the capacity of the geothermal power generation as a part of the New Sunshine Project. As a plan for the development, a development is made of logging equipment and its auxiliary system and then characteristics of the deep-seated geothermal well are clarified. The logging equipment is a PTSD (pressure/temperature/spinner flow-meter/fluid density) logger which stands the use at deep-seated geothermal wells of 400{degree}C and 490 kgf/cm{sup 2} and measures pressure, temperature, flow rate and fluid density under static and dynamic conditions. In this fiscal year, metal seals were developed for preventing geothermal fluids from penetrating into the PT probe. Qualities and inner/outer diameters of various kinds of structural materials used in the S probe were determined, and output necessary enough to detect the rotation number is obtained. Measuring precision of D logging by {gamma} rays was evaluated. The study was made of the monitoring technology including the borehole and ground measuring system, the borehole fluid sampling and the scale formation. Relating to the tracer widely used in monitoring of hydrothermal reservoirs, investigated was the trend of the technology from abroad. 8 refs., 60 figs., 26 tabs.

  9. Aortic ruptures in seat belt wearers.

    Science.gov (United States)

    Arajärvi, E; Santavirta, S; Tolonen, J

    1989-09-01

    Several investigations have indicated that rupture of the thoracic aorta is one of the leading causes of immediate death in victims of road traffic accidents. In Finland in 1983, 92% of front-seat passengers were seat belt wearers on highways and 82% in build-up areas. The mechanisms of rupture of the aorta have been intensively investigated, but the relationship between seat belt wearing and injury mechanisms leading to aortic rupture is still largely unknown. This study comprises 4169 fatally injured victims investigated by the Boards of Traffic Accident Investigation of Insurance Companies during the period 1972 to 1985. Chest injuries were recorded as the main cause of death in 1121 (26.9%) victims, 207 (5.0%) of those victims having worn a seat belt. Aortic ruptures were found at autopsy in 98 victims and the exact information of the location of the aortic tears was available in 68. For a control group, we analyzed 72 randomly chosen unbelted victims who had a fatal aortic rupture in similar accidents. The location of the aortic rupture in unbelted victims was more often in the ascending aorta, especially in drivers, whereas in seat belt wearers the distal descending aorta was statistically more often ruptured, especially in right-front passengers (p less than 0.05). The steering wheel predominated statistically as the part of the car estimated to have caused the injury in unbelted victims (37/72), and some interior part of the car was the most common cause of fatal thoracic impacts in seat belt wearers (48/68) (p less than 0.001). The mechanism of rupture of the aorta in the classic site just distal to the subclavian artery seems to be rapid deceleration, although complex body movements are also responsible in side impact collisions. The main mechanism leading to rupture of the ascending aorta seems to be severe blow to the bony thorax. This also often causes associated thoracic injuries, such as heart rupture and sternal fracture. Injuries in the ascending

  10. Adaptive magnetorheological seat suspension for shock mitigation

    Science.gov (United States)

    Singh, Harinder Jit

    This research focuses on theoretical and experimental analysis of an adaptive seat suspension employing magnetorheological energy absorber with the objective of minimizing injury potential to seated occupant of different weights subjected to broader crash intensities. The research was segmented into three tasks: (1) development of magnetorheological energy absorber, (2) biodynamic modeling of a seated occupant, and (3) control schemes for shock mitigation. A linear stroking semi-active magnetorheological energy absorber (MREA) was designed, fabricated and tested for intense impact conditions with piston velocities up to 8 m/s. MREA design was optimized on the basis of Bingham-plastic model (BPM model) in order to maximize the energy absorption capabilities at high impact velocities. Computational fluid dynamics and magnetic FE analysis were conducted to validate MREA performance. Subsequently, low-speed cyclic testing (0-2 Hz subjected to 0-5.5 A) and high-speed drop testing (0-4.5 m/s at 0 A) were conducted for quantitative comparison with the numerical simulations. Later, a nonlinear four degrees-of-freedom biodynamic model representing a seated 50th percentile male occupant was developed on the basis of experiments conducted on Hybrid II 50th percentile male anthropomorphic test device. The response of proposed biodynamic model was compared quantitatively against two different biodynamic models from the literature that are heavily implemented for obtaining biodynamic response under impact conditions. The proposed biodynamic model accurately predicts peak magnitude, overall shape and the duration of the biodynamic transient response, with minimal phase shift. The biodynamic model was further validated against 16 impact tests conducted on horizontal accelerator facility at NAVAIR for two different shock intensities. Compliance effects of human body were also investigated on the performance of adaptive seat suspension by comparing the proposed biodynamic model

  11. Evaluation of the seating of Qantas flight deck crew.

    Science.gov (United States)

    Lusted, M; Healey, S; Mandryk, J A

    1994-10-01

    In 1985 Qantas Airways (Australia) requested an ergonomics assessment of three pilots' seats so that one could be selected for fitting in all new aircraft as well replacement in existing aircraft. The Ipeco seat was chosen. In 1991, after all aircraft were fitted with the Ipeco seats, the company then requested a further evaluation of the seat to see if it was acceptable to the pilots and if there were any outstanding problems. A seat feature checklist plus a body chart discomfort rating scale was given to the total crew of 1030 pilots. The results from the 202 respondents indicated that although the pilots found the Ipeco seat an improvement on the Weber seat there were some modifications required. The main problems included insufficient adjustment range of the lumbar support area and the thigh supports, and infrequent replacement of the seat cushion. The body charts supported the checklist results in that the main areas of discomfort indicated were the buttocks and low back. Recommendations for improvements in design of the Ipeco seat, training in use and maintenance are presented. The method used in this study has application for field assessment of seating in a wide range of occupations, particularly bus drivers, truck drivers and train drivers, who spend long hours seated without being able to take breaks.

  12. Kinematics of pediatric crash dummies seated on vehicle seats with realistic belt geometry.

    Science.gov (United States)

    Klinich, Kathleen D; Reed, Matthew P; Ebert, Sheila M; Rupp, Jonathan D

    2014-01-01

    A series of sled tests was performed using vehicle seats and Hybrid-III 6-year-old (6YO) and 10YO anthropomorphic test devices (ATDs) to explore possibilities for improving occupant protection for children who are not using belt-positioning booster seats. Cushion length was varied from production length of 450 mm to a shorter length of 350 mm. Lap belt geometry was set to rear, mid, and forward anchorage locations that span the range of lap belt angles found in vehicles. Six tests each were performed with the 6YO and 10YO Hybrid III ATDs. One additional test was performed using a booster seat with the 6YO. The ATDs were positioned using an updated version of the University of Michigan Transportation Research Institute (UMTRI) seating procedure that positions the ATD hips further forward with longer seat cushions to reflect the effect of cushion length on posture that has been measured with child volunteers. ATD kinematics were evaluated using peak head excursion, peak knee excursion, the difference between peak head and peak knee excursion, and the maximum torso angle. Shortening the seat cushion improved kinematic outcomes, particularly for the 10YO. Lap belt geometry had a greater effect on kinematics with the longer cushion length, with mid or forward belt geometries producing better kinematics than the rearward belt geometry. The worst kinematics for both ATDs occurred with the long cushion length and rearward lap belt geometry. The improvements in kinematics from shorter cushion length or more forward belt geometry are smaller than those provided by a booster seat. The results show potential benefits in occupant protection from shortening cushion length and increasing lap belt angles, particularly for children the size of the 10YO ATD.

  13. La nuova sfida di SEAT Pagine Gialle

    Directory of Open Access Journals (Sweden)

    Leonardo Landini

    2008-03-01

    Full Text Available SEAT Pagine Gialle’s new challengeSEAT Pagine Gialle is a company that for over 80 years has provided information services, search and communication tools.The companies success and notoriety is built on a customer base of about 20 million families and 3 million professional operators with a continually updated technology with which it integrates with detailed geographical information that allows it to reach millions of users every day. The services the company offers include an advanced cartographic web-based search, satellite and aerial photos, the calculation of driving instructions, weather forecasts and traffic information, 360 degree views and the modelling of whole cities in 3D.

  14. A field-based approach for examining bicycle seat design effects on seat pressure and perceived stability.

    Science.gov (United States)

    Bressel, Eadric; Bliss, Shantelle; Cronin, John

    2009-05-01

    The purpose of this study was to investigate the effect of various bicycle seat designs on seat pressure and perceived stability in male and female cyclists using a unique field-based methodology. Thirty participants, comprising male and female cyclists, pedaled a bicycle at 118W over a 350m flat course under three different seat conditions: standard seat, a seat with a partial anterior cutout, and a seat with a complete anterior cutout. The pressure between the bicycle seat and perineum of the cyclist was collected with a remote pressure-sensing mat, and perceived stability was assessed using a continuous visual analogue scale. Anterior seat pressure and stability values for the complete cutout seat were significantly lower (p<0.05; 62-101%) than values for the standard and partial cutout designs. These findings were consistent between males and females. Our results would support the contention that the choice of saddle design should not be dictated by interface pressure alone since optimal anterior seat pressure and perceived seat stability appear to be inversely related.

  15. The seated bus passenger--a review.

    Science.gov (United States)

    Levis, J A

    1978-09-01

    The paper describes the inter-relationship of anthropometry, rig studies and dynamic testing of aspects related to problems of the seated bus passenger. It seeks to draw together sub-sections of a very large study sponsored by the government through the Transport and Road Research Laboratory and undertaken by the Human Factors Group of Leyland Truck and Bus. It is relevant to all those designing passenger carrying transport systems.

  16. Seat belt utilisation and awareness in UAE.

    Science.gov (United States)

    Bendak, S; Al-Saleh, K

    2013-01-01

    Seat belts (SBs) are effective devices for reducing injury risk due to traffic accidents. Seat belt wearing was made compulsory in the United Arab Emirates (UAE) in January 1999 for drivers and front seat passengers (FSPs). No comprehensive study has ever assessed SB wearing rates across the country. Also, little is known on drivers' awareness of the importance of wearing seatbelts and how human factors affect wearing habits. This study aims to determine SB wearing rates for drivers and FSPs in UAE through an observational field study. It also aims to investigate perceptions and behaviour of drivers on this issue as well as human factors that affect wearing rate through a randomly distributed questionnaire. The results of the field study show that the overall SB wearing rate across the country was 61% for drivers and 43.4% for FSPs and that there were significant differences between the seven emirates that constitute the country. The questionnaire results show that age, education level, gender, marital status and nationality of drivers affect wearing habits and perceptions. Future implications in terms of improving traffic safety awareness are discussed.

  17. Diameter 2 properties and convexity

    Czech Academy of Sciences Publication Activity Database

    Abrahamsen, T. A.; Hájek, Petr Pavel; Nygaard, O.; Talponen, J.; Troyanski, S.

    2016-01-01

    Roč. 232, č. 3 (2016), s. 227-242 ISSN 0039-3223 R&D Projects: GA ČR GA16-07378S Institutional support: RVO:67985840 Keywords : diameter 2 property * midpoint locally uniformly rotund * Daugavet property Subject RIV: BA - General Mathematics Impact factor: 0.535, year: 2016 https://www.impan.pl/pl/wydawnictwa/czasopisma-i-serie-wydawnicze/studia- mathematica /all/232/3/91534/diameter-2-properties-and-convexity

  18. Diameters of classes of smooth functions

    Science.gov (United States)

    Kudryavtsev, S. N.

    1995-08-01

    We describe the weak asymptotic behaviour of diameters of n-th order of the unit ball of W_p^l H^\\omega (I^d) in L_q(I^d), where I=(0,1), in dependence on n. Namely we consider the Kolmogorov diameter, the Gel'fand diameter, the linear diameter, the Aleksandrov diameter and the entropy diameter.

  19. NASA experiments on the B-720 structure and seats

    Science.gov (United States)

    Alfaro-Bou, E.

    1986-01-01

    Two experiments onboard a remotely piloted transport aircraft that was crashed on landing are discussed. The structural experiment deals with the location and distribution of the instrumentation throughout the airplane structure. In the seat experiment, the development and testing of an energy absorbing seat are discussed. The objective of the structural experiment was to obtain a data base of structural crash loads for use in the advancement of crashworthy technology of materials (such as composites) in structural design and for use in the comparison between computer and experimental results. The objective of the seat experiment was to compare the performance of an energy absorbing transport seat and a standard seat when subjected to similar crash pulses. Details are given on the location of instrumentation, on the dynamic seat test pulse and headward acceleration limits.

  20. SEAT CHOICE AND DISTANCE JUDGMENT IN PUBLIC SPACES (1).

    Science.gov (United States)

    Neto, Olavo Avalone; Munakata, Jun

    2015-10-01

    This research assessed whether public space users will adopt a least-effort approach and choose a less suitable seat nearby or seek the most suitable seat, even if it is farther away from them when the decision is made. How distance assessment affects seat choice was investigated through an observational survey, which allowed the identification of behavioral patterns. Those behavioral patterns were then tested in a paired comparison experiment with 40 participants. The results showed that the effect of distance on seat choice is related to the difference in distance between the options and that a sufficient difference can cause trade-offs between distance and seat properties. The necessary difference in distance is conditioned by the activity and the seat properties.

  1. Recognizing and treating toilet-seat contact dermatitis in children.

    Science.gov (United States)

    Litvinov, Ivan V; Sugathan, Paramoo; Cohen, Bernard A

    2010-02-01

    Toilet-seat contact dermatitis is a common condition around the world and is reemerging in the United States. It can be easily recognized and treated. However, few practitioners consider this diagnosis, which results in a delay in treatment and often exacerbation of the skin eruption. In the past, exposure to wooden toilet seats and associated varnish, lacquers, and paints led to the development of an allergic contact dermatitis on the buttocks and posterior thighs. In recent years, most public facilities have changed to plastic seats, resulting in a change in the clinical presentation of toilet-seat dermatitis. We present 5 cases of toilet-seat dermatitis in children from the United States and India and review the history, presentation, and clinical course of the disease. Our findings suggest that toilet-seat dermatitis is more common than previously recognized and should be considered in any child with a dermatitis that involves the buttocks and posterior thighs.

  2. Taxi driver seat belt wearing in Nanjing, China.

    Science.gov (United States)

    Routley, Virginia; Ozanne-Smith, Joan; Qin, Yu; Wu, Ming

    2009-01-01

    To determine and validate patterns of seat belt use and attitudes of taxi drivers on wearing a seat belt following national and provincial seat belt legislation in 2004-2005. Roadside daylight seat belt observation and interview survey methods were used, as well as observations from inside taxis during routine trips and a taxi driver focus group. The setting was Nanjing, Jiangsu Province, PR China in April of 2006 and 2007. Prevalence of seat belt use and attitudes to wearing a seat belt were determined, as were vehicle and driver characteristics, and comparisons with other motor-vehicle driver's seat belt use and attitudes. Taxi drivers interviewed were predominantly male and aged 30-39 years. They spent more hours per week in their vehicles and had more driving experience than other drivers. Over half (56.2%) of taxi drivers interviewed reported that they always wore seat belts, while observation of taxi drivers showed lower wearing rates (i.e., roadside observation was 43.8%, and observation from inside taxis was 36.2%). Belt tampering was a practice of 12-15% of taxi drivers. "Fine avoidance, safety, high speed and long trips" were given as important reasons for wearing and "feeling trapped and uncomfortable" for not wearing. Seat belt reminder signs in taxis were common (82.6% of taxis), but did not appear to impact on driver seat belt use. The four research methods found taxi drivers to have consistently low "correct wearing" rates. As in several other countries, taxi drivers are particularly resistant to seat belt use. Innovative strategies, including occupational health and safety approaches, may be required to achieve increased levels of seat belt use.

  3. Optimization of Aircraft Seat Cushion Fire Blocking Layers.

    Science.gov (United States)

    1983-03-01

    function of cost and weight, and the costs of labor involved in assembling a ccmposite seat cushion. The same classes of high char yield polymers that are...SEAT LATER DESIGN REPORT NRBBNBsg$$$$$$NN$$R$$$$$ SEAT DESIGN NUMBER: 009 LAYER NAME CODE NO. S MANUFACTURER 5 COST FACTORS . LABOR ...72621, 9096.. 7SS43. 73757. 77147. DELTA COSTS 0. 8340. 2922. 1136. 4327. ACOSOS in Iho..aS Of dollars. COST SUIRNY REPORT Re ....... VONR3 MORFA

  4. A target fibre study on seats in public houses.

    Science.gov (United States)

    Kelly, E; Griffin, R M

    1998-01-01

    A target fibre survey was conducted to assess the random occurrence of a blue wool fibre on seats in public houses throughout the United Kingdom. Fibre tape lifts were taken from 80 seats. Four seats yielded matching fibres and five of these were found on one seat. A total of 292 fibres were identified; nine fibres proved indistinguishable from the target after comparison microscopy, microspectro-photometry and attempts at thin layer chromatography, and two of these fibres were still apparently indistinguishable after TLC analysis although only one dye component was visible.

  5. 75 FR 30775 - Availability of Seats for the Monitor National Marine Sanctuary Advisory Council

    Science.gov (United States)

    2010-06-02

    ..., Recreational Diving seat, Education seat, Archaeological Research seat, Maritime Museum seat, Youth seat, and... of the famed Civil War ironclad, USS Monitor, best known for its battle with the Confederate ironclad... stakeholders, including: Citizen-at-Large, Conservation, Economic Development, Education, Heritage Tourism...

  6. 76 FR 36890 - Clarification of Prior Interpretations of the Seat Belt and Seating Requirements for General...

    Science.gov (United States)

    2011-06-23

    ... approved seat or berth and no restraining device for the child is used. In contrast, for commercial... proposed clarification also emphasizes that the proper restraint method for children during operations... Interpretations You can get an electronic copy using the Internet by-- (1) Searching the Federal eRulemaking...

  7. Variable temperature seat climate control system

    Science.gov (United States)

    Karunasiri, Tissa R.; Gallup, David F.; Noles, David R.; Gregory, Christian T.

    1997-05-06

    A temperature climate control system comprises a variable temperature seat, at least one heat pump, at least one heat pump temperature sensor, and a controller. Each heat pump comprises a number of Peltier thermoelectric modules for temperature conditioning the air in a main heat exchanger and a main exchanger fan for passing the conditioned air from the main exchanger to the variable temperature seat. The Peltier modules and each main fan may be manually adjusted via a control switch or a control signal. Additionally, the temperature climate control system may comprise a number of additional temperature sensors to monitor the temperature of the ambient air surrounding the occupant as well as the temperature of the conditioned air directed to the occupant. The controller is configured to automatically regulate the operation of the Peltier modules and/or each main fan according to a temperature climate control logic designed both to maximize occupant comfort during normal operation, and minimize possible equipment damage, occupant discomfort, or occupant injury in the event of a heat pump malfunction.

  8. Pilot tests of a seat belt gearshift delay on the belt use of commercial fleet drivers.

    Science.gov (United States)

    2009-12-01

    the seat belt was buckled. Participants, commercial drivers from the United States and Canada who did not consistently wear their seat belts, could avoid the delay by fastening their seat belts. Unbelted participants experienced a delay of either a c...

  9. Determining the relationship of primary seat belt laws to minority ticketing : traffic tech.

    Science.gov (United States)

    2011-09-01

    When a State converts from secondary to primary seat belt : enforcement, studies show increases of 10 percentage points or : more in observed seat belt use. Primary enforcement laws allow : an officer to ticket a motorist whenever they observe a seat...

  10. Effect of die relief on the seating, fit and retention of cast gold crowns cemented on human teeth.

    Science.gov (United States)

    Lee, H H; Ibbetson, R J

    2000-02-01

    Die relief, by means of a paint-on die spacing material, is the most common method of achieving sufficient space between metal castings and tooth surfaces for cement to flow during seating. Several studies have determined the influence of cementing variables on crowns made for metal and plastic test dies. This study assessed the influence of die relief upon the seating and retention of cast gold crowns constructed for natural human teeth. Standard full crown preparations were made for 10 matched pairs of extracted human third molars, one each of which had been relieved with die spacer of approximately 40 microns thickness. Crowns were made by the indirect technique and were cemented with zinc phosphate cement in a static/dynamic jig. Seating behaviour and vertical discrepancies were measured electronically. Tensile bond strengths were determined in a universal testing machine. Results showed that die relief reduced vertical seating discrepancy associated with cementation by up to 79 microns. Differences between paired relieved and unrelieved samples were significant (p < 0.05). There were no statistically significant differences in tensile bond between paired relieved and unrelieved crowns.

  11. Identifying strategies to improve the effectiveness of booster seat laws

    Science.gov (United States)

    2008-05-01

    The objective of this project was to identify strategies to improve the effectiveness of booster seat laws. The project explored the possible factors that relate to the use and nonuse of booster seats, and examined the attitudes of law enforcement of...

  12. 14 CFR 125.211 - Seat and safety belts.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 3 2010-01-01 2010-01-01 false Seat and safety belts. 125.211 Section 125... Requirements § 125.211 Seat and safety belts. (a) No person may operate an airplane unless there are available... the airplane who is at least 2 years old; and (2) An approved safety belt for separate use by each...

  13. Fairness of seat allocation methods in proportional representation

    African Journals Online (AJOL)

    Results from simulations are provided to support the two main theorems describing the effect of ..... A second simulation was implemented to determine the average number of vote-seats, as well as the maximum number of vote-seats ... as in the case of solving classical matrix games in game theory. The linear programming ...

  14. Musculoskeletal analysis of driving fatigue: The influence of seat adjustments

    DEFF Research Database (Denmark)

    Majid, Noor Aliah binti Abdul; Abdullah, Mohd Fareez Edzuan; Jamaludin, Mohd Syahmi

    2013-01-01

    Main causes for discomfort experienced by vehicle drivers during driving were investigated using a rigid-body model originally developed in the AnyBody Modeling System [1]. The interactions between the human body and the car-seat in various combinations of seat-pan/backrest inclinations and the e...

  15. Canadian seat belt wearing rates, promotion programs, and future directions.

    NARCIS (Netherlands)

    Grant, B.A.

    1992-01-01

    On the basis of a national driver seat belt survey conducted in Canada each year, the most important results are presented. A number of programmes for increasing seat belt use has been evaluated in Canada. Finally, a description is given of some of the current and planned activities within Canada

  16. Fairness of seat allocation methods in proportional representation ...

    African Journals Online (AJOL)

    Fairness of seat allocation methods in proportional representation. L van Eck, S E Visagie, H C de Kock. Abstract. In this paper the fairness of some methods of allocating seats in a proportional representation (PR) voting system is investigated. Different PR systems are in use throughout the democratic world, but the primary ...

  17. Assessment of Rail Seat Abrasion Patterns and Environment

    Science.gov (United States)

    2012-05-01

    Rail seat abrasion (RSA) of concrete ties is manifested by the loss of material under the rail seat area and, in extreme cases, results in loss of rail clip holding power, reverse rail cant, and gauge widening. RSA was measured in several curves on t...

  18. An Investigation of University Students' Classroom Seating Choices

    Science.gov (United States)

    Xi, Li; Yuan, Zhang; YunQui, Bai; Chiang, Feng-Kuang

    2017-01-01

    The classroom is crucial for students, and seating position within the classroom can affect students' performance. This study conducted a survey to investigate the relationship between seating zones and academic performance among 174 university students in Beijing. The results revealed differences in student performance in terms of seating…

  19. Analysis of Seat Belt Anchorage Strength for Vehicles

    Science.gov (United States)

    Shi, Peicheng; Xu, Zengwei

    2018-01-01

    In order to improve the efficiency of seat design and enhance the safety of vehicle seats, it is necessary to carry out CAE analysis on seat safety before making physical tests. In this paper, the finite element analysis theory and HyperWorks finite element analysis software are applied in the pretreatment of vehicle seats, seat belts, as well as the upper limbs and buttocks of dummies. The loading time and load of the seat are set according to GB 14167-2013 of the People’s Republic of China, and CAE calculation is carried out based on LSDYNA software, obtaining the stress-strain nephogram of the corresponding vehicle seats. An improved scheme is proposed base on the analysis results, and CAE analysis is carried out on the improved seats again. The results of the analysis fully meet the national standard GB 14167-2013 and material strength requirements, which are of important guiding significance in reducing the development costs, shortening the development cycle and improving the passing rate of physical test.

  20. 49 CFR 38.75 - Priority seating signs.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 1 2010-10-01 2010-10-01 false Priority seating signs. 38.75 Section 38.75 Transportation Office of the Secretary of Transportation AMERICANS WITH DISABILITIES ACT (ADA) ACCESSIBILITY SPECIFICATIONS FOR TRANSPORTATION VEHICLES Light Rail Vehicles and Systems § 38.75 Priority seating signs. (a) Each vehicle shall contain sign(s)...

  1. The effects of seat belt legislation on road traffic injuries.

    Science.gov (United States)

    Trinca, G W; Dooley, B J

    1977-04-01

    The compulsory wearing of seat belts, first introduced in the world in Victoria in 1970, has effectively reduced the number of deaths and injuries by approximately one-third for car occupants involved in motor vehicle crashes. Initially, the legislation did not apply to children under the age of eight years, but in 1975 a further law was introduced banning children from the front seat of any vehicle unless properly harnessed. Seat belts offer the best protection for front seat drivers and passengers involved in frontal impacts, but offer less protection to the recipient of a side impact. Ten per cent of car occupants admitted to hospital after a frontal impact show injuries, mostly minor, directly attibutable to the wearing of seat belts.

  2. Support force measures of midsized men in seated positions.

    Science.gov (United States)

    Bush, Tamara Reid; Hubbard, Robert P

    2007-02-01

    Two areas not well researched in the field of seating mechanics are the distribution of normal and shear forces, and how those forces change with seat position. The availability of these data would be beneficial for the design and development of office, automotive and medical seats. To increase our knowledge in the area of seating mechanics, this study sought to measure the normal and shear loads applied to segmental supports in 12 seated positions, utilizing three inclination angles and four levels of seat back articulation that were associated with automotive driving positions. Force data from six regions, including the thorax, sacral region, buttocks, thighs, feet, and hand support were gathered using multi-axis load cells. The sample contained 23 midsized subjects with an average weight of 76.7 kg and a standard deviation of 4.2 kg, and an average height of 1745 mm with a standard deviation of 19 mm. Results were examined in terms of seat back inclination and in terms of torso articulation for relationships between seat positions and support forces. Using a repeated measures analysis, significant differences (p<0.05) were identified for normal forces relative to all inclination angles except for forces occurring at the hand support. Other significant differences were observed between normal forces behind the buttocks, pelvis, and feet for torso articulations. Significant differences in the shear forces occurred under the buttocks and posterior pelvis during changes in seat back inclination. Significant differences in shear forces were also identified for torso articulations. These data suggest that as seat back inclination or torso articulation change, significant shifts in force distribution occur.

  3. 75 FR 36062 - Availability of Conservation Seat and Diving Operations Seat for the Flower Garden Banks National...

    Science.gov (United States)

    2010-06-24

    ... Conservation Seat and Diving Operations Seat for the Flower Garden Banks National Marine Sanctuary Advisory... Flower Garden Banks National Marine Sanctuary Advisory Council: Conservation and Diving Operations... Jennifer Morgan, NOAA--Flower Garden Banks National Marine Sanctuary, 4700 Avenue U, Bldg. 216, Galveston...

  4. Finding an optimal seating arrangement for employees

    Directory of Open Access Journals (Sweden)

    Ninoslav Čerkez

    2015-10-01

    Full Text Available The paper deals with modelling a specifc problem called the Optimal Seating Arrangement (OSA as an Integer Linear Program and demonstrated that the problem can be efficiently solved by combining branch-and-bound and cutting plane methods. OSA refers to a specific scenario that could possibly happen in a corporative environment, i.e. when a company endeavors to minimize travel costs when employees travel to an organized event. Each employee is free to choose the time to travel to and from an event and it depends on personal reasons. The paper differentiates between using different travel possibilities in the OSA problem, such as using company assigned or a company owned vehicles, private vehicles or using public transport, if needed. Also, a user-friendly web application was made and is available to the public for testing purposes.

  5. Evaluation of wear resistant ceramic valve seats in gas-fueled power generation engines

    Science.gov (United States)

    Burrahm, R. W.; Branecky, R. J.; Sui, P. C.; Latusek, J. P.; Hsu, S. M.

    1994-12-01

    This project is directed at the reduction of valve recession in natural gas-fueled engines. Ceramic valve seat inserts have been procured, installed in a Caterpillar G3516 natural gas generator set, and tested for 1000 hours. Two different silicon nitride materials are being utilized for the valve seats in addition to stock Eatonite metallic inserts. Three valve face materials are being tested. These include stock Caterpillar stellite 1 faced, stellite 6 faced, and unfaced valves. A test matrix was used to allow comparison of all three valve face materials in combination with all three insert materials. The testing is scheduled to continue for an additional 7000 hours. No problems have been encountered with the test materials. In general, it has been shown that two types of silicon nitride materials have at least short term durability in engine operation. Neither material has exhibited any deficiencies thus far. An economic analysis spreadsheet has been created to calculate potential cost savings potential using ceramic valve seat inserts. Valve recession data for the first 1000 hours shows expected trends. Exhaust valve positions are wearing more than intake valve positions. If the intake positions and all positions with unfaced valve are ignored, then ceramic inserts paired with Stellite 1 valves show the most wear.

  6. Digital three-dimensional modelling of the male pelvis and bicycle seats: impact of rider position and seat design on potential penile hypoxia and erectile dysfunction.

    Science.gov (United States)

    Gemery, John M; Nangia, Ajay K; Mamourian, Alexander C; Reid, Scott K

    2007-01-01

    To digitally model (three-dimensional, 3D) the course of the pudendal arteries relative to the bony pelvis in the adult male, and to identify sites of compression with different bicycle riding positions as a potential cause of penile hypoxia and erectile dysfunction. 3D models were made from computed tomography scans of one adult male pelvis (a healthy volunteer) and three bicycle seats. Models were correlated with lateral radiographs of a seated rider to determine potential vascular compression between the bony pelvis and seats at different angles of rider positioning. Pelvis/seat models suggest that the most likely site of compression of the internal pudendal artery is immediately below the pubic symphysis, especially with the rider leaning forward. For an upright rider, the internal pudendal arteries do not appear to be compressed between the seat and the bony pelvis. Leaning partly forward with arms extended, the seat/symphysis areas were reduced to 73 mm(2) with standard seat and 259 mm(2) with a grooved seat. Leaning fully forward, the seat/symphysis areas decreased (no space with standard seat; 51 mm(2) with a grooved seat) and both the ischial tuberosities and the pubic symphysis might be in contact with the seat. A grooved seat allows better preservation of the seat/symphysis space than a standard seat, but the rider's position is more important for preserving the seat-symphysis space (and reducing compression) than is seat design alone. Any factors which influence the seat-symphysis space (including an individual's anatomy, seat design and rider position) can increase the potential for penile hypoxia and erectile dysfunction/perineal numbness.

  7. New devices for measuring forces on the kayak foot bar and on the seat during flat-water kayak paddling: a technical report.

    Science.gov (United States)

    Nilsson, Johnny E; Rosdahl, Hans G

    2014-03-01

    The purpose was to develop and validate portable force-measurement devices for recording push and pull forces applied by each foot to the foot bar of a kayak and the horizontal force at the seat. A foot plate on a single-point force transducer mounted on the kayak foot bar underneath each foot allowed the push and pull forces to be recorded. Two metal frames interconnected with 4 linear ball bearings, and a force transducer allowed recording of horizontal seat force. The foot-bar-force device was calibrated by loading each foot plate with weights in the push-pull direction perpendicular to the foot plate surface, while the seat-force device was calibrated to horizontal forces with and without weights on the seat. A strong linearity (r2 = .99-1.0) was found between transducer output signal and load force in the push and pull directions for both foot-bar transducers perpendicular to the foot plate and the seat-force-measuring device. Reliability of both devices was tested by means of a test-retest design. The coefficient of variation (CV) for foot-bar push and pull forces ranged from 0.1% to 1.1%, and the CV for the seat forces varied from 0.6% to 2.2%. The current study opens up a field for new investigations of the forces generated in the kayak and ways to optimize kayak-paddling performance.

  8. Circular seating arrangements: Approaching the social crux in language classrooms

    Directory of Open Access Journals (Sweden)

    Joseph Falout

    2014-01-01

    Full Text Available Circular seating arrangements can help instill a sense of belonging within classroom communities with overall positive effects on learning, emotions, and wellbeing. Yet students and their teachers within certain language classroom contexts, due to sociocultural limitations, may be relegated to learning in antisocial environments instilled partly by rank-and-file seating. Attributions for teacher demotivation can often lie in student misbehaviors, while student demotivation, silence, and resistance relate strongly to lack of bodily displays and physical affordances of interpersonal care, understanding, and trust that, if present, would contribute positively to many social aspects of their learning and identity formation. Specifically, rank-and-file seating constricts the area in the classroom most likely to dispose attention and interest to the learning and to others, whereas circular seating potentially expands this area, known as the action zone, to the whole classroom. Seating arrangements therefore can play an important role in the formation of interpersonal dynamics and identity formation among students and their teachers. In this paper, the purposes and ways of using circular seating in language classrooms will be explored from a social psychological perspective. Language teachers are invited to imagine and experiment with possibilities for uses of different seating arrangements in their own classrooms.

  9. Energy Absorbing Seat System for an Agricultural Aircraft

    Science.gov (United States)

    Kellas, Sotiris; Jones, Lisa E. (Technical Monitor)

    2002-01-01

    A task was initiated to improve the energy absorption capability of an existing aircraft seat through cost-effective retrofitting, while keeping seat-weight increase to a minimum. This task was undertaken as an extension of NASA ongoing safety research and commitment to general aviation customer needs. Only vertical crash scenarios have been considered in this task which required the energy absorbing system to protect the seat occupant in a range of crash speeds up to 31 ft/sec. It was anticipated that, the forward and/or side crash accelerations could be attenuated with the aid of airbags, the technology of which is currently available in automobiles and military helicopters. Steps which were followed include, preliminary crush load determination, conceptual design of cost effective energy absorbers, fabrication and testing (static and dynamic) of energy absorbers, system analysis, design and fabrication of dummy seat/rail assembly, dynamic testing of dummy seat/rail assembly, and finally, testing of actual modified seat system with a dummy occupant. A total of ten full scale tests have been performed including three of the actual aircraft seat. Results from full-scale tests indicated that occupant loads were attenuated successfully to survivable levels.

  10. Impact Testing and Simulation of a Crashworthy Composite Fuselage Section with Energy-Absorbing Seats and Dummies

    Science.gov (United States)

    Fasanella, Edwin L.; Jackson, Karen E.

    2002-01-01

    A 25-ft/s vertical drop test of a composite fuselage section was conducted with two energy-absorbing seats occupied by anthropomorphic dummies to evaluate the crashworthy features of the fuselage section and to determine its interaction with the seats and dummies. The 5-ft diameter fuselage section consists of a stiff structural floor and an energy-absorbing subfloor constructed of Rohacel foam blocks. The experimental data from this test were analyzed and correlated with predictions from a crash simulation developed using the nonlinear, explicit transient dynamic computer code, MSC.Dytran. The anthropomorphic dummies were simulated using the Articulated Total Body (ATB) code, which is integrated into MSC.Dytran.

  11. Effect of Seating on Exposures to Whole-Body Vibration in Vehicles

    Science.gov (United States)

    PADDAN, G. S.; GRIFFIN, M. J.

    2002-05-01

    The vibration isolation efficiency of seating has been evaluated in 100 work vehicles in 14 categories (cars, vans, lift trucks, lorries, tractors, buses, dumpers, excavators, helicopters, armoured vehicles, mobile cranes, grass rollers, mowers and milk floats). Seat isolation efficiency, expressed by the SEAT value, was determined for all seats (67 conventional seats and 33 suspension seats) from the vertical acceleration measured on the floors and on the seats of the vehicles.For most categories of vehicle, the average SEAT value was less than 100%, indicating that the average seat provided some attenuation of vibration. However, there were large variations in SEAT values between vehicles within categories. Two alternative vibration frequency weightings (Wb from BS 6841, 1987; Wk from ISO 2631, 1997) yielded SEAT values that differed by less than 6%. Overall, the SEAT values determined by two alternative methods (the ratio of r.m.s. values and the ratio of vibration dose values) differed by less than 4·5% when using weighting Wb, although larger differences may be expected in some situations. The median SEAT value for the suspension seats was 84·6%; the median SEAT value for the conventional seats was 86·9% (based on weighting Wb and the ratio of r.m.s. values).Predicted SEAT values were obtained assuming that each seat could be interchanged between vehicles without altering its transmissibility. The calculations suggest that 94% of the vehicles investigated might benefit from changing the current seat to a seat from one of the other vehicles investigated. Although the predictions are based on assumptions that will not always apply, it is concluded that the severity of whole-body vibration exposures in many work environments can be lessened by improvements to seating dynamics.

  12. MACRO MODEL OF SEAT BELT USE BY CAR DRIVERS AND PASSENGERS

    Directory of Open Access Journals (Sweden)

    Kazimierz JAMROZ

    2013-12-01

    Full Text Available The article presents some problems of seat belt use by car drivers and passengers. It looks in particular at seat belt use and effectiveness in selected countries. Next, factors of seat belt use are presented and methodology of model development. A macro model of seat belt use is presented based on data from around fifty countries from different continents.

  13. 49 CFR 571.222 - Standard No. 222; School bus passenger seating and crash protection.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 6 2010-10-01 2010-10-01 false Standard No. 222; School bus passenger seating and... requirements for school bus passenger seating and restraining barriers. S2. Purpose. The purpose of this... that the minimum number of occupants can be belted. School bus passenger seat means a seat in a school...

  14. The constitutionality of mandatory seat belt use legislation.

    Science.gov (United States)

    1972-12-01

    A number of trends indicate that mandatory seat belt use legislation is to be expected within the near future. The constitutionality of such self-protective legislation has been the subject of recent speculation. Constitutional challenges may be expe...

  15. Documenting How States Recently Upgraded to Primary Seat Belt Laws

    Science.gov (United States)

    2011-09-01

    States with primary seat belt enforcement laws consistently have higher observed daytime belt use rates than : secondary law States. Secondary belt law States, on the other hand, consistently have more occupant fatalities who : were not restrained th...

  16. Controversial Swedish science minister loses seat in reshuffle

    CERN Multimedia

    Sylawan, P

    1998-01-01

    Carl Tham, who introduced sweeping changes to higher education and research, has lost his seat in a cabinet reshuffle. As science minister for 4 years he redirected funding to applied science and established new regional universities (1 page).

  17. The abutment seating jig: a prosthodontic implant adjunct.

    Science.gov (United States)

    Judy, K W

    1997-01-01

    Rapid, accurate seating of screw-retained implant abutment heads, where timing is controlled by internal or external hex designs, can be readily accomplished with individual, custom-cast abutment head location devices. The devices are especially useful when the abutment head-implant body complex is to be permanently cemented. The use and design of abutment seating jigs for single tooth implants and completely implant or implant and natural tooth-supported prostheses are described.

  18. Infant bath seats, drowning and near-drowning.

    Science.gov (United States)

    Byard, R W; Donald, T

    2004-01-01

    To investigate the possible role of infant bathtub seats in drowning and near-drowning episodes in infants. A review was conducted of the files of the Forensic Science Centre and Child Protection Unit, Women's and Children's Hospital, Adelaide, South Australia, for significant immersion incidents in infants involving bathtub seats from January 1998 to December 2003. A total of six cases of drowning occurred over the 6-year period of the study in children under 2 years of age, including two infants. One of these cases, a 7-month-old boy, had been left unattended for some time in an adult bath in a bathtub seat. He was found drowned, having submerged after slipping down and becoming trapped in the seat. Three near-drowning episodes occurred in children under the age of 2 years, including two boys aged 7 and 8 months, both of whom had been left for some time in adult baths in bath seats. Both were successfully resuscitated and treated in hospital. These cases demonstrate the vulnerability of infants to immersion incidents when left unattended in bathtubs. Bathtubs are particularly dangerous for infants as the slippery and smooth surfaces predispose to loss of balance and make escape from water difficult. Infant bathtub seats may give parents and child carers a false sense of security leading to infants being left unattended. Unfortunately, however, infants may fall out of, or slip and become trapped in, such seats. Infants and young children cannot be left unsupervised in water, and devices used as bathing aids such as bathtub seats may contribute to immersion incidents.

  19. Fire-resistant materials for aircraft passenger seat construction

    Science.gov (United States)

    Fewell, L. L.; Tesoro, G. C.; Moussa, A.; Kourtides, D. A.

    1979-01-01

    The thermal response characteristics of fabric and fabric-foam assemblies are described. The various aspects of the ignition behavior of contemporary aircraft passenger seat upholstery fabric materials relative to fabric materials made from thermally stable polymers are evaluated. The role of the polymeric foam backing on the thermal response of the fabric-foam assembly is also ascertained. The optimum utilization of improved fire-resistant fabric and foam materials in the construction of aircraft passenger seats is suggested.

  20. SEAT BELT USE AMONG CAR USERS IN MALAYSIA

    Directory of Open Access Journals (Sweden)

    S. KULANTHAYAN

    2004-01-01

    Full Text Available The car is the second (40% most common mode of transportation in Malaysia. In terms of fatal road accidents, car drivers constitute about 9.0% and passengers 13.6% of fatalities. The major cause of car occupants' fatality in such accidents is head injuries, which consist of more than half (56.4% of the fatalities. Thus restraining the head and body, the initial position is the most important injury control strategy for car users. The use of seat belts was deemed one of the most effective ways to reduce road accident fatalities in Malaysia and consequently the mandatory seat belt law was enforced in the early seventies. Therefore, a study on factors influencing the compliance behaviour of seat belt use among cars is needed as to date no such research has been undertaken in Malaysia. A questionnaire study was carried out in Selangor, Malaysia on the compliance behaviour of car occupants in relation to seat belt use. A total of 237 respondents were interviewed and the data analysed using logistic regression method. Six variables were found to be significant at 5 percent level (p<0.05: seating position, location of travel, education level, speeding, night-time driving and enforcement. Compliance with the seat belt law was higher among drivers, educated car users, in the presence of enforcement activities, travelling in city-center areas and car users with a positive attitude towards the risks of speeding and night driving.

  1. Development of adaptive helicopter seat systems for aircrew vibration mitigation

    Science.gov (United States)

    Chen, Yong; Wickramasinghe, Viresh; Zimcik, David G.

    2008-03-01

    Helicopter aircrews are exposed to high levels of whole body vibration during flight. This paper presents the results of an investigation of adaptive seat mount approaches to reduce helicopter aircrew whole body vibration levels. A flight test was conducted on a four-blade helicopter and showed that the currently used passive seat systems were not able to provide satisfactory protection to the helicopter aircrew in both front-back and vertical directions. Long-term exposure to the measured whole body vibration environment may cause occupational health issues such as spine and neck strain injuries for aircrew. In order to address this issue, a novel adaptive seat mount concept was developed to mitigate the vibration levels transmitted to the aircrew body. For proof-of-concept demonstration, a miniature modal shaker was properly aligned between the cabin floor and the seat frame to provide adaptive actuation authority. Adaptive control laws were developed to reduce the vibration transmitted to the aircrew body, especially the helmet location in order to minimize neck and spine injuries. Closed-loop control test have been conducted on a full-scale helicopter seat with a mannequin configuration and a large mechanical shaker was used to provide representative helicopter vibration profiles to the seat frame. Significant vibration reductions to the vertical and front-back vibration modes have been achieved simultaneously, which verified the technical readiness of the adaptive mount approach for full-scale flight test on the vehicle.

  2. Using posturography to measure balance control during seated tai chi.

    Science.gov (United States)

    Geib, Roy W; Li, Hongtao; Waite, Gabi N; Pagnacco, Guido; Oggero, Elena; Roberts, Beverly L

    2014-01-01

    Tai Chi for Arthritis (TCA) is recognized by the CDC as an evidenced-based program to prevent falls in older adults. Although seated Tai Chi is recommended for those unable to stand, little is known about balance control during seated TCA. To explore the use of posturography to assess differences between experts and non-expert practitioners of seated TCA. Twenty-three participants were recruited from those attending a Tai cChi workshop. While seated in a hard back chair centered on a force platform, participants performed selected forms from TCA and then did them in a continuous sequence. Center of pressure (CoP) indices to assess balance were normalized by height and then compared between expert and non-expert participants. Experts had significantly greater average velocity and path length (p = 0.02) for the entire sequence and open/close, but not for CoP 95% Confidence ellipse area. No significant differences in the CoP were found for commencement, wave hands, or single whip. A few differences in balance control while performing seated TCA movements were found. Future studies are needed to determine whether these can be accounted for by quality of the Tai Chi movements or factors associated with the seated position.

  3. SEX DETERMINATION FROM FEMORAL HEAD DIAMETERS IN ...

    African Journals Online (AJOL)

    hi-tech

    2000-03-01

    Mar 1, 2000 ... Request for reprints to: Dr. P S Igbigbi, Department of Anatomy, College of Medicine, Private Bag 360 Chichiri, Blantyre 3 Malawi. SEX DETERMINATION .... Figure 2. Bar chart showing the ranges of head diameters of male and female femurs. (RVD-Right vertical diameter; LVD-Left vertical diameter; RTD -.

  4. 7 CFR 51.2850 - Diameter.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 2 2010-01-01 2010-01-01 false Diameter. 51.2850 Section 51.2850 Agriculture... Diameter. Diameter means the greatest dimension measured at right angles to a straight line running from the stem to the root. ...

  5. 7 CFR 51.3211 - Diameter.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 2 2010-01-01 2010-01-01 false Diameter. 51.3211 Section 51.3211 Agriculture... Standards for Grades of Bermuda-Granex-Grano Type Onions Definitions § 51.3211 Diameter. Diameter means the greatest dimension of the onion at right angles to a line running from the stem to the root. Metric...

  6. Development of a method for rating climate seat comfort

    Science.gov (United States)

    Scheffelmeier, M.; Classen, E.

    2017-10-01

    The comfort aspect in the vehicle interior is becoming increasingly important. A high comfort level offers the driver a good and secure feeling and has a strong influence on passive traffic safety. One important part of comfort is the climate aspect, especially the microclimate that emerges between passenger and seat. In this research, different combinations of typical seat materials are used. Fourteen woven and knitted fabrics and eight leathers and its substitutes for the face fabric layer, one foam, one non-woven and one 3D spacer for the plus pad layer and for the support layer three foam types with variations in structure and raw material as well as one rubber hair structure were investigated. To characterise this sample set by thermo-physiological aspects (e.g. water vapour resistance Ret, thermal resistance Rct, buffering capacity of water vapour Fd) regular and modified sweating guarded hotplates were used according to DIN EN ISO 11092. The results of the material characterisation confirm the common knowledge that seat covers out of textiles have better water vapour resistance values than leathers and its substitutes. Subject trials in a driving simulator were executed to rate the subjective sensation while driving in a vehicle seat. With a thermal, sweating Manikin (Newton Type, Thermetrics) objective product measurements were carried out on the same seat. Indeed the subject trials show that every test subject has his or her own subjective perception concerning the climate comfort. The results of the subject trials offered the parameters for the Newton measuring method. Respectively the sweating rate, sit-in procedure, ambient conditions and sensor positions on and between the seat layers must be comparable with the subject trials. By taking care of all these parameters it is possible to get repeatable and reliable results with the Newton Manikin. The subjective feelings of the test subjects, concerning the microclimate between seat and passenger, provide

  7. The Study of Fabric Performance for Car Seats

    Directory of Open Access Journals (Sweden)

    Antonin Havelka

    2017-09-01

    Full Text Available This paper deals with the investigation of the performance of car seat fabrics in terms of physiological comfort of sitting, specifi cally their water vapour resistance and air permeability. The current work presents an alternative approach to increasing the effectiveness of car seat fabrics through a combination of newly designed middle layer with forced convection achieved by a supplementary suction ventilation device. The supplementary device was designed to measure water vapour permeability by means of the sweating guarded hot plate (SGHP system. It consists of two parts: a frame to grip a tested sample for measurements within the SGHP system and two suction ventilators which are arranged at one end of the mentioned frame in order to provide suction into the tested fabric plane during the SGHP test. The results of this investigation show that water vapour transport is increased by approximately 20% compared to the standard way of measurement by means of SGHP because of forced air flow in the plane of ribbed – channelled structure of the car seat middle layer. The findings of this study have a number of important implications for future practice. The combination of a car seat cover with channelled structure and forced air fl ow improves physiological comfort of sitting which is a key issue for both drivers and manufacturers. The suggested device for forced air flow convection in the plane of a car seat fabric has not yet been part of an actual car seat, however it is possible to use its principles in a smart car seat prototype.

  8. The Surprising Impact of Seat Location on Student Performance

    Science.gov (United States)

    Perkins, Katherine K.; Wieman, Carl E.

    2005-01-01

    Every physics instructor knows that the most engaged and successful students tend to sit at the front of the class and the weakest students tend to sit at the back. However, it is normally assumed that this is merely an indication of the respective seat location preferences of weaker and stronger students. Here we present evidence suggesting that in fact this may be mixing up the cause and effect. It may be that the seat selection itself contributes to whether the student does well or poorly, rather than the other way around. While a number of studies have looked at the effect of seat location on students, the results are often inconclusive, and few, if any, have studied the effects in college classrooms with randomly assigned seats. In this paper, we report on our observations of a large introductory physics course in which we randomly assigned students to particular seat locations at the beginning of the semester. Seat location during the first half of the semester had a noticeable impact on student success in the course, particularly in the top and bottom parts of the grade distribution. Students sitting in the back of the room for the first half of the term were nearly six times as likely to receive an F as students who started in the front of the room. A corresponding but less dramatic reversal was evident in the fractions of students receiving As. These effects were in spite of many unusual efforts to engage students at the back of the class and a front-to-back reversal of seat location halfway through the term. These results suggest there may be inherent detrimental effects of large physics lecture halls that need to be further explored.

  9. Thermal comfort of seats as visualized by infrared thermography.

    Science.gov (United States)

    Sales, Rosemary Bom Conselho; Pereira, Romeu Rodrigues; Aguilar, Maria Teresa Paulino; Cardoso, Antônio Valadão

    2017-07-01

    Published studies that deal with the question of how the temperature of chair seats influences human activities are few, but the studies considering such a factor, a function of the type of material, could contribute to improvements in the design of chairs. This study evaluates seat temperatures of 8 types of chairs made of different materials. The parts of the furniture that people come into contact with, and the thermal response of the material to heating and cooling have been evaluated. Infrared thermography was used for this, as it is a non-contact technique that does not present any type of risk in the measurement of temperatures. Seats made of synthetic leather (leatherette), wood and polyester fabric were found to have the highest temperatures, and the plywood seat showed the lowest. The study has also revealed that thermography can contribute to studies of thermal comfort of chair seats in addition to determining the most suitable material. Copyright © 2017 Elsevier Ltd. All rights reserved.

  10. Comparison of astigmatic axis in the seated and supine positions.

    Science.gov (United States)

    Smith, E M; Talamo, J H; Assil, K K; Petashnick, D E

    1994-01-01

    Refractive error is assessed in the seated position while keratorefractive procedures are performed in the supine position. Since position-induced ocular torsion could yield suboptimal results from improper axis alignment, this study was undertaken to ascertain whether ocular cyclotorsion occurs when a subject moves from a seated to supine position. Fifty eyes of 29 subjects with refractive cylinder greater than 0.50 diopters were enrolled. Refraction was done with a phoropter and the correction was placed in a trial frame using plus cylinder. Astigmatic axis was determined in the seated and supine positions for 32 eyes by utilizing the "rocking the cylinder" technique and for 32 eyes using the Jackson cross cylinder. Both techniques were used for 14 eyes. No statistically-significant difference for cylinder axis measured in the seated versus supine position was observed using the rocking the cylinder (4.3 degrees standard deviation [SD], 3.5 degrees, range 0 degrees to 13 degrees, p = NS) or the Jackson cross cylinder methods (2.3 degrees, SD, 1.9 degrees, range 0 degrees to 7 degrees, p = NS). Approximately 25% of eyes had a change in axis of 7 degrees to 16 degrees. These data suggest that the cylinder axis does not change significantly or predictably when most subjects move from the seated to supine position. The Jackson cross cylinder method seems more accurate and reproducible than the rocking the cylinder technique in determination of astigmatic axis under these circumstances.

  11. Children's and Adults' Comfort Experience of Extra Seat Belts When Riding in the Rear Seat of a Passenger Car.

    Science.gov (United States)

    Osvalder, Anna-Lisa; Hansson, Ida; Bohman, Katarina

    2015-01-01

    The objective of this study was to explore passengers' comfort experience of extra seat belts during on-road driving in the rear seat of a passenger car and to investigate how the use of extra belts affects children's and adults' attitudes to the product. Two different seat belt systems were tested, criss-cross (CC) and backpack (BP), consisting of the standard 3-point belt together with an additional 2-point belt. In total, 32 participants (15 children aged 6-10, 6 youths aged 11-15, and 11 adults aged 20-79, who differed considerably in size, shape, and proportions) traveled for one hour with each system, including city traffic and highway driving. Four video cameras monitored the test subject during the drive. Subjective data regarding emotions and perceived discomfort were collected in questionnaires every 20 min. A semistructured interview was held afterwards. All participant groups accepted the new products and especially the increased feeling of safety (P car. CC was appreciated for its symmetry, comfort, and the perceived feeling of safety. Some participants found CC unpleasant because the belts tended to slip close to the neck, described as a strangling feeling. BP was simpler to use and did not cause annoyance to the neck in the way CC did. Instead, it felt asymmetric and to some extent less safe than CC. Body size and shape affected seat belt fit to a great extent, which in turn affected the experience of comfort, both initially and over time. Perceived safety benefit and experienced comfort were the most determinant factors for the attitude toward the extra seat belts. The extra seat belts were perceived as being better than the participants had expected before the test, and they became more used to them over time. This exploratory study provided valuable knowledge from a user perspective for further development of new seat belt systems in cars. In addition to an increased feeling of safety, seat belt fit and comfort are supplementary influencing

  12. MIT-Skywalker: Evaluating comfort of bicycle/saddle seat.

    Science.gov (United States)

    Goncalves, Rogerio S; Hamilton, Taya; Daher, Ali R; Hirai, Hiroaki; Krebs, Hermano I

    2017-07-01

    The MIT-Skywalker is a robotic device developed for the rehabilitation of gait and balance after a neurological injury. This device has been designed based on the concept of a passive walker and provides three distinct training modes: discrete movement, rhythmic movement, and balance training. In this paper, we present our efforts to evaluate the comfort of a bicycle/saddle seat design for the system's novel actuated body weight support device. We employed different bicycle and saddle seats and evaluated comfort using objective and subjective measures. Here we will summarize the results obtained from a study of fifteen healthy subjects and one stroke patient that led to the selection of a saddle seat design for the MIT-Skywalker.

  13. School bus transportation for students seated in wheelchairs.

    Science.gov (United States)

    Buning, Mary Ellen; Karg, Patricia E

    2011-01-01

    For children with Individualized Education Plans (IEPs), transportation is considered a related service and a part of their education. This paper presents an overview of the current status of wheelchair transportation for students on school buses within the United States. The review includes the school transportation environment for wheelchair-seated students, applicable regulations and voluntary standards, primary safety issues for wheelchair-seated students, and key stakeholders roles in improving wheelchair transportation safety. Future actions to improve wheelchair transportation safety in school transportation are discussed, including the need to improve data collection, mandate payment for and use of RESNA WC19-compliant wheelchairs, improve training for bus operators and attendants, and require specialty certification for school bus operators who transport wheelchair-seated students.

  14. Sitting biomechanics, part II: optimal car driver's seat and optimal driver's spinal model.

    Science.gov (United States)

    Harrison, D D; Harrison, S O; Croft, A C; Harrison, D E; Troyanovich, S J

    2000-01-01

    Driving has been associated with signs and symptoms caused by vibrations. Sitting causes the pelvis to rotate backwards and the lumbar lordosis to reduce. Lumbar support and armrests reduce disc pressure and electromyographically recorded values. However, the ideal driver's seat and an optimal seated spinal model have not been described. To determine an optimal automobile seat and an ideal spinal model of a driver. Information was obtained from peer-reviewed scientific journals and texts, automotive engineering reports, and the National Library of Medicine. Driving predisposes vehicle operators to low-back pain and degeneration. The optimal seat would have an adjustable seat back incline of 100 degrees from horizontal, a changeable depth of seat back to front edge of seat bottom, adjustable height, an adjustable seat bottom incline, firm (dense) foam in the seat bottom cushion, horizontally and vertically adjustable lumbar support, adjustable bilateral arm rests, adjustable head restraint with lordosis pad, seat shock absorbers to dampen frequencies in the 1 to 20 Hz range, and linear front-back travel of the seat enabling drivers of all sizes to reach the pedals. The lumbar support should be pulsating in depth to reduce static load. The seat back should be damped to reduce rebounding of the torso in rear-end impacts. The optimal driver's spinal model would be the average Harrison model in a 10 degrees posterior inclining seat back angle.

  15. Advanced Infant Car Seat Would Increase Highway Safety

    Science.gov (United States)

    Dabney, Richard; Elrod, Susan

    2004-01-01

    An advanced infant car seat has been proposed to increase highway safety by reducing the incidence of crying, fussy behavior, and other child-related distractions that divert an adult driver s attention from driving. In addition to a conventional infant car seat with safety restraints, the proposed advanced infant car seat would include a number of components and subsystems that would function together as a comprehensive infant-care system that would keep its occupant safe, comfortable, and entertained, and would enable the driver to monitor the baby without having to either stop the car or turn around to face the infant during driving. The system would include a vibrator with bulb switch to operate; the switch would double as a squeeze toy that would make its own specific sound. A music subsystem would include loudspeakers built into the seat plus digital and analog circuitry that would utilize plug-in memory modules to synthesize music or a variety of other sounds. The music subsystem would include a built-in sound generator that could synthesize white noise or a human heartbeat to calm the baby to sleep. A second bulb switch could be used to control the music subsystem and would double as a squeeze toy that would make a distinct sound. An anti-noise sound-suppression system would isolate the baby from potentially disturbing ambient external noises. This subsystem would include small microphones, placed near the baby s ears, to detect ambient noise. The outputs of the microphone would be amplified and fed to the loudspeakers at appropriate amplitude and in a phase opposite that of the detected ambient noise, such that the net ambient sound arriving at the baby s ears would be almost completely cancelled. A video-camera subsystem would enable the driver to monitor the baby visually while continuing to face forward. One or more portable miniature video cameras could be embedded in the side of the infant car seat (see figure) or in a flip-down handle. The outputs of

  16. Booster seat law enforcement : examples from Delaware, New Jersey, Pennsylvania, and Washington.

    Science.gov (United States)

    2010-02-01

    The objective of this study was to evaluate the implementation of State booster seat laws : (enhanced child restraint laws) and examine the most effective strategies that law enforcement agencies can : use to enforce booster seat laws. The research i...

  17. 75 FR 12726 - Availability of Seats for the Channel Islands National Marine Sanctuary Advisory Council

    Science.gov (United States)

    2010-03-17

    ... vacant seats on the Channel Islands National Marine Sanctuary Advisory Council: Tourism alternate... are chosen based upon their particular expertise and experience in relation to the seat for which they...

  18. Child car seats – a habitat for house dust mites and reservoir for harmful allergens

    Directory of Open Access Journals (Sweden)

    David Clarke

    2015-02-01

    Child car seats and driver seats are habitats to a range of mite species which can be present in sufficient concentrations to cause or aggravate allergen related illnesses in individuals who are genetically predisposed.

  19. Improved Seat, Console, and Workplace Design: Annotated Bibliography, Integration of the Literature, Accommodation Model, and Seated Operator Reach Profiles

    Science.gov (United States)

    1976-12-31

    transmitted through che small areas to the seat, causing high pressure points. This results in reduced blood flow leading to numbness and pain . Soft...some operators to re- current symptoms of incoordination and muscle pain . 5 A-4 3 A 44 ’’I 2,g CATEGORY: WORKPLACE DESIGN AUTHOR: Ellis, D.S. TITLE...the knee, and not so far backward as to exert pressure upon the coccyx . (c) The seat should slope from before backward, a drop of approximately 1 inch

  20. Greek Electoral System: Optimal Distribution of the Seats

    Science.gov (United States)

    Tsitouras, Ch.

    2007-09-01

    The Greek parliamentary elections of 2008 and 2012 will take place according to the electoral low which had been voted by the previous house back in 2004. The parties receive a nation-wide number of seats that have to be distributed in the prefectures. It is a transportation problem where the legislator neglected its complete solution after finding a first random feasible solution.

  1. CDC Vital Signs: Adult Seat Belt Use in the US

    Science.gov (United States)

    ... to Know [PODCAST – 1:20 minutes] Seat Belts- What You Need to Know [PSA – 1:00 minute] On Other Web Sites The Community Guide: Primary Versus Secondary Enforcement Laws MedlinePlus – Motor Vehicle Safety MedlinePlus – Injuries Top of Page Get Email Updates To receive email updates about ...

  2. Restraint use and seating position among children in motor vehicles ...

    African Journals Online (AJOL)

    A descriptive study was used to assess use of child restraints, seating positions of children, driver restraint and vehicle overloading in Bloemfontein in 2007. Two pairs of observers stood at selected sites recording these findings. The study was done over a period of 1 month. Results. A total of 512 children in 374 vehicles ...

  3. Development and initial validation of the Seated Posture Scale.

    Science.gov (United States)

    Barks, Lelia; Luther, Stephen L; Brown, Lisa M; Schulz, Brian; Bowen, Mary Elizabeth; Powell-Cope, Gail

    2015-01-01

    Literature shows that some health outcomes (e.g., eating, breathing, and speaking) are directly related to posture. Evidence of outcomes mediated by wheelchair seated posture is limited to interface pressure, physical function, and wheelchair skills and safety. This study's purpose was to develop and validate a rapid, low-burden, paper-pencil assessment of wheelchair seated posture for research use and to test feasibility of its use with a sample of older adults. We used a prospective design and a convenience sample of older adults who were receiving rehabilitation services in a community living center. Forty-nine older wheelchair users participated. Main measures were the Seated Posture Scale (SPS), Modified Ashworth Scale, Barthel Index, Visual Descriptor Scale, scale-content validity index (S-CVI), Cronbach alpha, and test-retest reliability. Rating by six experts yielded the overall content validity score (S-CVI) of 0.744. Total SPS score correlated positively with physical function (Barthel Index, r = 0.46, p Scale, r = -0.44, p = 0.001), supporting SPS construct validity. Internal consistency was 0.66 (Cronbach alpha). Test-retest reliability yielded Pearson product-moment correlations of 0.89 to 0.99. We conclude that the SPS has sufficient preliminary validity and reliability to support its use as an evaluation of wheelchair seated posture in outcomes research.

  4. Designing Train Passenger Seat by Kansei Engineering in Indonesia

    Directory of Open Access Journals (Sweden)

    Hapsari Sakya Nabila

    2017-01-01

    Full Text Available Public transport adoption is still major problem in Indonesia. Integrating impression and emotion to service may change the image of public transport, leading to fast adoption rate. As product development technique, Kansei Engineering is well known to facilitate that integration. This paper communicates the implementation of Kansei Engineering (KE in designing train passenger seat in Indonesia. The train between Bandung-Solo (8 hours journey was chosen to be the investigated object. The train was selected to be refurbished by introducing a new passenger seat design, emphasizing on the improvement of passenger experience. As the first step of KE type I technique, travel experience of the existing passengers were taken into the consideration for selecting Kansei words. It was found that the relevant Kansei words to design passenger train seat in Indonesia were: comfort, people-friendly, multifunction, safe, soft, spacious, relaxing, superior, maintainable, strong, producible, minimalist, attractive, modern, unique, and durable. Upon understanding the semantic meaning of those words, physical properties and technical specification were produced by consulting to the related members. Finally, a passenger seat with synthetic leather cover, modular design, foldable table, individual power point, bluesilver color, and adjusted to Indonesian’s anthropometry data was proposed as the final design

  5. Three-dimensional musculoskeletal modelling of the seated row ...

    African Journals Online (AJOL)

    Adjustments had to be made to the model to solve the forward dynamics simulations; as a result, no muscle forces or contraction values were obtained. This negatively influenced the value of the results as these parameters are important when analysing an exercise. The seated row resistance-training machine's engineered ...

  6. Restraint use and seating position among children in motor vehicles ...

    African Journals Online (AJOL)

    Minibuses, buses and trucks, as well as motor vehicles with tinted or covered windows, were excluded from the study. The following observations were recorded by the researchers for each child in a motor vehicle: seating position of the child, whether child restraint was used and type of restraint, whether restraint was.

  7. 75 FR 4509 - Uniform Criteria for State Observational Surveys of Seat Belt Use

    Science.gov (United States)

    2010-01-28

    ... consistent seat belt use estimates. Under the proposed rule, the following roads would be permitted to be...). The outcome of the State's annual Statewide seat belt use survey provides one of the core performance... Observational Surveys of Seat Belt Use AGENCY: National Highway Traffic Safety Administration (NHTSA...

  8. Knowledge, attitude and use of seat belt among commercial drivers in Sokoto Metropolis

    Directory of Open Access Journals (Sweden)

    A O Abiola

    2010-01-01

    Conclusion: This study has identified high level of knowledge, positive attitude and reported use of seat belt. It is recommended that public awareness of the safety benefits of seat belts and strong enforcement are necessary to achieve optimal use of seat belt.

  9. The Mutual Impact of Personality Traits on Seating Preference and Educational Achievement

    Science.gov (United States)

    Hemyari, Camellia; Zomorodian, Kamiar; Ahrari, Iman; Tavana, Samar; Parva, Mohammad; Pakshir, Keyvan; Jafari, Peyman; Sahraian, Ali

    2013-01-01

    Several studies have investigated the association between students' seating positions and their classroom performance. However, the role of personality traits on seating preference in the classroom has not been well investigated. The aim of the study was to understand how students choose their seats according to their personality traits in a…

  10. 77 FR 19155 - Federal Motor Vehicle Safety Standards; Seat Belt Assembly Anchorages; Incorporation by Reference

    Science.gov (United States)

    2012-03-30

    ... Participation I. FMVSS No. 210 FMVSS No. 210, ``Seat belt assembly anchorages,'' applies to passenger cars, multipurpose passenger vehicles (MPVs), trucks, and buses. The standard establishes requirements for seat belt.... 210 and Figure 2 in FMVSS No. 222, ``School bus passenger seating and crash protection''). \\1\\ For lap...

  11. Walk Right In, Sit Right Down: Seating in the College English Literature Classroom

    Science.gov (United States)

    Eiland, Thomas T.

    2017-01-01

    Seating arrangements in college English Literature courses can have an impact on the learning experience for the student. Students who had completed at least one college-level English literature course at a community college were asked about their experiences in four seating arrangements: traditional rows of seats, Socratic circle/seminar style,…

  12. The use of seat belts and contributing factors : an international comparison.

    NARCIS (Netherlands)

    Mäkinen, T. Wittink, R.D. & Hagenzieker, M.P.

    1991-01-01

    The purpose of this study was to define factors that contribute to the use or non-use of seat belts. Legislation prescribing compulsory seat belt usage is one of the most important factors. Promotion of the use of seat belts without this legislation is very difficult and time-consuming. So far, the

  13. Considerations for classroom seating arrangements and the role of teacher characteristics and beliefs

    NARCIS (Netherlands)

    Gremmen, Mariola; van den Berg, Y.H.M.; Segers, E.; Cillessen, A.H.N.

    2016-01-01

    As a part of classroom management, teachers face the question of how and where to seat their students. However, it is far from clear what considerations teachers have when making seating arrangements. Therefore, in this study seating arrangement considerations from 50 teachers in grades 4–6 of

  14. Parental Views Regarding Seating and Participation for Young Children with Cerebral Palsy

    Science.gov (United States)

    Bolas, Jennifer; Boyle, Paul

    2017-01-01

    The aim of this article was to explore the views of parents regarding seating for children with cerebral palsy. Two interviews with parents were conducted. These were transcribed verbatim and thematic analysis was conducted. This small study outlines three themes: the importance of seating, seating and participation, and the parental role in…

  15. 49 CFR 571.210 - Standard No. 210; Seat belt assembly anchorages.

    Science.gov (United States)

    2010-10-01

    ... bolt holes or the centroid of any other means of attachment to the structure specified in 4.1.3.1... are either: (a) For designated seating positions that are common to the same occupant seat and that... common to the same occupant seat, but that face in the same direction, if the vertical centerline of the...

  16. Safety characteristics of mid-sized MOX fueled liquid metal reactor core of high converter type in the initiating phase of unprotected loss of flow accident. Effect of low specific fuel power density on ULOF behavior brought by employment of large diameter fuel pins

    International Nuclear Information System (INIS)

    Ishida, Masayoshi; Kawada, Kenichi; Niwa, Hajime

    2003-07-01

    Safety characteristics in core disruptive accidents (CDAs) of mid-sized MOX fueled liquid metal reactor core of high converter type have been examined by using the CDA initiating phase analysis code SAS4A. The design concept of high converter type reactor core has been studied as one of options in the category of sodium-cooled reactor in Phase II of Feasibility Study on Commercialized Fast Reactor Cycle System. An unprotected loss-of-flow accident (ULOF) has been selected as a representative CDA initiator for this study. A core concept of high converter type, which employed a large diameter fuel pin of 11.1 mm with 1.2 m core height to get a large fuel volume fraction in the core to achieve high internal conversion ratio was proposed in JFY2001. Each fuel subassembly of the core (abbreviated here as UPL120)was provided with an upper sodium plenum directly above the core to reduce the sodium void reactivity worth. Because of the large fuel pin diameter, average specific fuel power density (31 kW/kg-MOX) of UPL120 is about one half of those of conventional large MOX cores. The reactivity worth of sodium voiding is 6$ in the whole core, and -1$ in the all upper plenums. Initiating phase of ULOF accident in UPL120 under the conditions of nominal design and best estimate analysis resulted in a slightly super-prompt critical power burst. The causes of the super-prompt criticality have been identified twofold: (a) the low specific fuel power density of core reduced the effectiveness of prompt negative reactivity feedback of Doppler and axial fuel expansion effects upon increase in reactor power, and (b) the longer core height compared with conventional 1m cores brought, together with the lower specific power density, a remarkable delay in insertion of negative fuel dispersion reactivity after the onset of fuel disruption in sodium voided subassembly due to the lower linear heat rating in the top portion of the core. During the delay, burst-type fuel failures in sodium un

  17. Dynamic forces over the interface between a seated human body and a rigid seat during vertical whole-body vibration.

    Science.gov (United States)

    Liu, Chi; Qiu, Yi; Griffin, Michael J

    2017-08-16

    Biodynamic responses of the seated human body are usually measured and modelled assuming a single point of vibration excitation. With vertical vibration excitation, this study investigated how forces are distributed over the body-seat interface. Vertical and fore-and-aft forces were measured beneath the ischial tuberosities, middle thighs, and front thighs of 14 subjects sitting on a rigid flat seat in three postures with different thigh contact while exposed to random vertical vibration at three magnitudes. Measures of apparent mass were calculated from transfer functions between the vertical acceleration of the seat and the vertical or fore-and-aft forces measured at the three locations, and the sum of these forces. When sitting normally or sitting with a high footrest, vertical forces at the ischial tuberosities dominated the vertical apparent mass. With feet unsupported to give increased thigh contact, vertical forces at the front thighs were dominant around 8Hz. Around 3-7Hz, fore-and-aft forces at the middle thighs dominated the fore-and-aft cross-axis apparent mass. Around 8-10Hz, fore-and-aft forces were dominant at the ischial tuberosities with feet supported but at the front thighs with feet unsupported. All apparent masses were nonlinear: as the vibration magnitude increased the resonance frequencies decreased. With feet unsupported, the nonlinearity in the apparent mass was greater at the front thighs than at the ischial tuberosities. It is concluded that when the thighs are supported on a seat it is not appropriate to assume the body has a single point of vibration excitation. Copyright © 2017 Elsevier Ltd. All rights reserved.

  18. Design of a hot clamp for small diameter LMFBR piping

    International Nuclear Information System (INIS)

    Jones, J.W.; Hamel, D.

    1980-01-01

    In order to evaluate the feasibility of using a strap-type clamp on breeder reactor small diameter piping, a series of analyses were conducted to determine the thermal and mechanical stresses induced in the pipe by the clamp. The effect of using a thin layer of insulation of varying thickness between the pipe and clamp was also investigated. A thermal analysis of the pipe and clamp was conducted for each thermal transient rate. Various insulation values ranging from metal-to-metal condition to perfect insulation between the pipe and clamp were analyzed to determine the effect of insulating the pipe from the clamp. An axisymmetric finite element model was used to determine the axial thermal and stress patterns

  19. Effective diameters and corresponding states of fluids

    Science.gov (United States)

    Del Río, Fernando

    Effective hard-sphere diameters of fluids with purely repulsive interactions are derived from a generalized corresponding-states principle of Leland, Rowlinson and coworkers. Various alternative definitions are discussed and related. Virial expansions of the effective diameters and their corresponding volumes are obtained and compared with results of perturbation theory. Applications are made to inverse-power potentials, the repulsive part of the Lennard-Jones potential and hard spherocylinders and dumbells.

  20. Appendiceal diameter: CT versus sonographic measurements

    Energy Technology Data Exchange (ETDEWEB)

    Orscheln, Emily S. [University of Cincinnati Medical Center, Department of Radiology, Cincinnati, OH (United States); Trout, Andrew T. [Cincinnati Children' s Hospital Medical Center, Department of Radiology, Cincinnati, OH (United States)

    2016-03-15

    Ultrasound and CT are the dominant imaging modalities for assessment of suspected pediatric appendicitis, and the most commonly applied diagnostic criterion for both modalities is appendiceal diameter. The classically described cut-off diameter for the diagnosis of appendicitis is 6 mm when using either imaging modality. To demonstrate the fallacy of using the same cut-off diameter for both CT and US in the diagnosis of appendicitis. We conducted a retrospective review of patients younger than 18 years who underwent both US and CT of the appendix within 24 h. The shortest transverse dimension of the appendix was measured at the level of the proximal, mid and distal appendix on US and CT images. We compared mean absolute difference in appendiceal diameter between US and CT, using the paired t-test. We reviewed exams of 155 children (58.7% female) with a mean age of 11.3 ± 4.2 years; 38 of the children (24.5%) were diagnosed with appendicitis. The average time interval between US and CT was 7.0 ± 5.4 h. Mean appendiceal diameter measured by CT was significantly larger than that measured by US in cases without appendicitis (5.3 ± 1.0 mm vs. 4.7 ± 1.1 mm, P < 0.0001) and in cases with appendicitis (8.3 ± 2.2 mm vs. 7.0 ± 2.0 mm, P < 0.0001). Mean absolute diameter difference at any location along the appendix was 1.3-1.4 mm in normal appendices and 2 mm in cases of appendicitis. Measured appendiceal diameter differs between US and CT by 1-2 mm, calling into question use of the same diameter cut-off (6 mm) for both modalities for the diagnosis of appendicitis. (orig.)

  1. Bijective Diameters of Gene Tree Parsimony Costs.

    Science.gov (United States)

    Gorecki, Pawel; Eulenstein, Oliver

    2017-08-04

    Synthesizing median trees from a collection of gene trees under the biologically motivated gene tree parsimony (GTP) costs has provided credible species tree estimates. GTP costs are defined for each of the classic evolutionary processes. These costs count the minimum number of events necessary to reconcile the gene tree with the species tree where the leaf-genes are mapped to the leaf-species through a function called labeling. To better understand the synthesis of median trees under these costs there is an increased interest in analyzing their diameters. The diameters of a GTP cost between a gene tree and a species tree are the maximum values of this cost of one or both topologies of the trees involved. We are concerned about the diameters of the GTP costs under bijective labelings. While these diameters are linear time computable for the gene duplication and deep coalescence costs, this has been unknown for the classic gene duplication and loss, and for the loss cost. For the first time, we show how to compute these diameters and proof that this can be achieved in linear time, and thus, completing the computational time analysis for all of the bijective diameters under the GTP costs.

  2. Determination of crash test pulses and their application to aircraft seat analysis

    Science.gov (United States)

    Alfaro-Bou, E.; Williams, M. S.; Fasanella, E. L.

    1981-01-01

    Deceleration time histories (crash pulses) from a series of twelve light aircraft crash tests conducted at NASA Langley Research Center (LaRC) were analyzed to provide data for seat and airframe design for crashworthiness. Two vertical drop tests at 12.8 m/s (42 ft/s) and 36 G peak deceleration (simulating one of the vertical light aircraft crash pulses) were made using an energy absorbing light aircraft seat prototype. Vertical pelvis acceleration measured in a 50 percentile dummy in the energy absorbing seat were found to be 45% lower than those obtained from the same dummy in a typical light aircraft seat. A hybrid mathematical seat-occupant model was developed using the DYCAST nonlinear finite element computer code and was used to analyze a vertical drop test of the energy absorbing seat. Seat and occupant accelerations predicted by the DYCAST model compared quite favorably with experimental values.

  3. A seat at the table: redesigning cancer care.

    Science.gov (United States)

    Nevidjon, Brenda

    2014-02-01

    The Institute of Medicine's ([IOM's], 2011) report, The Future of Nursing: Leading Change, Advancing Health, included the key message, "Nurses should be full partners, with physicians and other health professionals, in redesigning health care in the United States" (p. 221). That is a call for nurses to lead at every level-to have a seat at the table when critical decisions are being made. Those decisions extend from clinical care to national policy, and all require the voice of nurses. The annual Gallup (2013) Honesty/Ethics in Professions survey again listed nursing as the most ethical profession. With that trust and the IOM report, among other things, nursing is well positioned to be at many tables. Having a seat is not enough, though. Nurses must contribute to the action at the table.

  4. Design Optimisation and Conrol of a Pilot Operated Seat Valve

    DEFF Research Database (Denmark)

    Nielsen, Brian; Andersen, Torben Ole; Hansen, Michael Rygaard

    2004-01-01

    The paper gives an approach for optimisation of the bandwidth of a pilot operated seat valve for mobile applications. Physical dimensions as well as parameters of the implemented control loop are optimised simultaneously. The frequency response of the valve varies as a function of the pressure drop...... across the valve, and it is found to be necessary to scale the controller parameters in the optimised design as a function of pressure drop....

  5. Dynamic Performance Assessment of Side Facing Troop Seats During Impact

    Science.gov (United States)

    2016-04-30

    AFRL-RH-WP-TR-2016-0095 DYNAMIC PERFORMANCE ASSESSMENT OF SIDE FACING TROOP SEATS DURING IMPACT Mr. Chris Burneka Mr. Chris...PAGE Using Government drawings, specifications , or other data included in this document for any purpose other than Government procurement does...not in any way obligate the U.S. Government. The fact that the Government formulated or supplied the drawings, specifications , or other data does

  6. Affirmative Action: Reservation Seats untuk Perempuan di Parlemen India

    Directory of Open Access Journals (Sweden)

    Evi Yunita Kurniaty

    2015-12-01

    Full Text Available The study aims to help us understand and analyze women's efforts in the policy-making process to increase their political participation in the constitutional and electoral processes. We can also see the extent to which the values rooted in the patriarchal culture in a society and what can be done and reduce them. Affirmative action is carried out in India by applying the system of reservation seats for women in the Indian Parliament. This is done in India is proven to increase the number of women in the Indian Parliament. By the way there are quotas for women as a strategy for accessing the political arena has growing support among MPs. In this study, Indonesia could get a reservation seats of learning about the system is done. To increase the representation in the "area" is very difficult to be touched by a quota system which is run now, it can be done with reservation seats quota to ensure women's representation in parliament.

  7. A social media program to increase adolescent seat belt use.

    Science.gov (United States)

    Drake, Stacy A; Zhang, Ni; Applewhite, Courtney; Fowler, Katherine; Holcomb, John B

    2017-09-01

    In response to motor vehicle crashes remaining the leading cause of death for teenagers in the United States, a nursing clinical group (n = 10) in conjunction with a local hospital injury prevention program created an educational campaign to bolster seat belt use. The nursing students created an Instagram account to serve as an educational tool to promote seat belt use among teenagers aged 14-19, and the program was presented at three high school health fairs. In all, 135 postings were made to the account over a 3-month period. The number of likes posted by high school students was the unit of analysis. The most significant result (p = .01) was the difference between postings most liked (celebrities wearing seat belts) and least liked (postings made at the high school health fair), otherwise, differences among postings liked (humor postings, response requests, pictures of celebrities, factual data) were not significant. Instagram user engagement, measured in number of likes, is indicative that social media provides platforms to promote injury prevention efforts. Further research is needed to identify measurable elements of social media and to follow-up on behavioral changes following participation. © 2017 Wiley Periodicals, Inc.

  8. Machine for development impact tests in sports seats and similar

    Science.gov (United States)

    Gonçalves, R. M.

    2015-10-01

    This paper describes the stages of development of a machine to perform impact tests in sport seats, seats for spectators and multiple seats. This includes reviews and recommendations for testing laboratories that have needs similar to the laboratory where unfolded this process.The machine was originally developed seeking to meet certain impact tests in accordance with the NBR15925 standards; 15878 and 16031. The process initially included the study of the rules and the election of the tests for which the machine could be developed and yet all reports and outcome of interaction with service providers and raw materials.For operating facility, it was necessary to set entirely the machine control, which included the concept of dialogue with operator, the design of the menu screens and the procedures for submission and registration of results. To ensure reliability in the process, the machine has been successfully calibrated according to the requirements of the Brazilian network of calibration.The criticism to this enterprise covers the technical and economic aspects involved and points out the main obstacles that were needed to overcome.

  9. Assessing ergonomic risks of software: Development of the SEAT.

    Science.gov (United States)

    Peres, S Camille; Mehta, Ranjana K; Ritchey, Paul

    2017-03-01

    Software utilizing interaction designs that require extensive dragging or clicking of icons may increase users' risks for upper extremity cumulative trauma disorders. The purpose of this research is to develop a Self-report Ergonomic Assessment Tool (SEAT) for assessing the risks of software interaction designs and facilitate mitigation of those risks. A 28-item self-report measure was developed by combining and modifying items from existing industrial ergonomic tools. Data were collected from 166 participants after they completed four different tasks that varied by method of input (touch or keyboard and mouse) and type of task (selecting or typing). Principal component analysis found distinct factors associated with stress (i.e., demands) and strain (i.e., response). Repeated measures analyses of variance showed that participants could discriminate the different strain induced by the input methods and tasks. However, participants' ability to discriminate between the stressors associated with that strain was mixed. Further validation of the SEAT is necessary but these results indicate that the SEAT may be a viable method of assessing ergonomics risks presented by software design. Copyright © 2016 Elsevier Ltd. All rights reserved.

  10. Machine for development impact tests in sports seats and similar

    International Nuclear Information System (INIS)

    Gonçalves, R M

    2015-01-01

    This paper describes the stages of development of a machine to perform impact tests in sport seats, seats for spectators and multiple seats. This includes reviews and recommendations for testing laboratories that have needs similar to the laboratory where unfolded this process.The machine was originally developed seeking to meet certain impact tests in accordance with the NBR15925 standards; 15878 and 16031. The process initially included the study of the rules and the election of the tests for which the machine could be developed and yet all reports and outcome of interaction with service providers and raw materials.For operating facility, it was necessary to set entirely the machine control, which included the concept of dialogue with operator, the design of the menu screens and the procedures for submission and registration of results. To ensure reliability in the process, the machine has been successfully calibrated according to the requirements of the Brazilian network of calibration.The criticism to this enterprise covers the technical and economic aspects involved and points out the main obstacles that were needed to overcome. (paper)

  11. Control of Separation and Diameter of Ag Nanorods through Self-organized Seeds.

    Science.gov (United States)

    Elliott, Paul R; Stagon, Stephen P; Huang, Hanchen

    2015-11-20

    This paper proposes a mechanism of controlling the diameter and separation of metallic nanorods from physical vapor deposition through self-organized seeds and experimentally demonstrates the feasibility using Ag as the prototype metal, In as the seed, and Si the substrate. Being non-wetting on Si substrates, deposited In atoms self-organize into islands. Subsequently deposited Ag atoms attach to In islands, rather than to Si substrates, due to preferential bonding and geometrical shadowing. The experimental results show that self-organized In seeds of 5 nm nominal thickness give rise to the best separation and the smallest diameter of Ag nanorods.

  12. Validation of seat-off and seat-on in repeated sit-to-stand movements using a single-body-fixed sensor

    International Nuclear Information System (INIS)

    Van Lummel, R C; Ainsworth, E; Hausdorff, J M; Lindemann, U; Beek, P J; Van Dieën, J H

    2012-01-01

    The identification of chair rise phases is a prerequisite for quantifying sit-to-stand movements. The aim of this study is to validate seat-off and seat-on detection using a single-body-fixed sensor against detection based on chair switches. A single sensor system with three accelerometers and three gyroscopes was fixed around the waist. Synchronized on–off switches were placed under the chair. Thirteen older adults were recruited from a residential care home and fifteen young adults were recruited among college students. Subjects were asked to complete two sets of five trials each. Six features of the trunk movement during seat-off and seat-on were calculated automatically, and a model was developed to predict the moment of seat-off and seat-on transitions. The predictions were validated with leave-one-out cross-validation. Feature extraction failed in two trials (0.7%). For the optimal combination of seat-off predictors, cross-validation yielded a mean error of 0 ms and a mean absolute error of 51 ms. For the best seat-on predictor, cross-validation yielded a mean error of –3 ms and a mean absolute error of 127 ms. The results of this study demonstrate that seat-off and seat-on in repeated sit-to-stand movements can be detected semi-automatically in young and older adults using a one-body-fixed sensor system with an accuracy of 51 and 127 ms, respectively. The use of the ambulatory instrumentation is feasible for non-technically trained personnel. This is an important step in the development of an automated method for the quantification of sit-to-stand movements in clinical practice. (paper)

  13. Height - Diameter predictive equations for Rubber (Hevea ...

    African Journals Online (AJOL)

    BUKOLA

    The importance of calibrating models on height-diameter relationship can never be over emphasized in predicting mean ... parameters that variously important in forest growth modeling and many sustainable forest management options(e.g., Van ..... Natural forest Ecosystem, southwest Nigeria. Research Journal of Forestry ...

  14. Liquid-vapor rectilinear diameter revisited

    Science.gov (United States)

    Garrabos, Y.; Lecoutre, C.; Marre, S.; Beysens, D.; Hahn, I.

    2018-02-01

    In the modern theory of critical phenomena, the liquid-vapor density diameter in simple fluids is generally expected to deviate from a rectilinear law approaching the critical point. However, by performing precise scannerlike optical measurements of the position of the SF6 liquid-vapor meniscus, in an approach much closer to criticality in temperature and density than earlier measurements, no deviation from a rectilinear diameter can be detected. The observed meniscus position from far (10 K ) to extremely close (1 mK ) to the critical temperature is analyzed using recent theoretical models to predict the complete scaling consequences of a fluid asymmetry. The temperature dependence of the meniscus position appears consistent with the law of rectilinear diameter. The apparent absence of the critical hook in SF6 therefore seemingly rules out the need for the pressure scaling field contribution in the complete scaling theoretical framework in this SF6 analysis. More generally, this work suggests a way to clarify the experimental ambiguities in the simple fluids for the near-critical singularities in the density diameter.

  15. Maximum Diameter of Impacting Liquid Droplets

    NARCIS (Netherlands)

    Laan, N.; de Bruin, K.G.; Bartolo, D.; Josserand, C.; Bonn, D.

    2014-01-01

    The maximum diameter a droplet that impacts on a surface will attain is the subject of controversy, notably for high-velocity impacts of low-viscosity liquids such as water or blood. We study the impact of droplets of simple liquids of different viscosities, and a shear-thinning complex fluid

  16. Photoacoustic determination of blood vessel diameter

    NARCIS (Netherlands)

    Kolkman, R.G.M.; Klaessens, John H.G.M.; Hondebrink, Erwin; Hopman, Jeroen C.W.; de Mul, F.F.M.; Steenbergen, Wiendelt; Thijssen, Johan M.; van Leeuwen, Ton

    2004-01-01

    A double-ring sensor was applied in photoacoustic tomographic imaging of artificial blood vessels as well as blood vessels in a rabbit ear. The peak-topeak time (τ pp) of the laser (1064 nm) induced pressure transient was used to estimate the axial vessel diameter. Comparison with the actual vessel

  17. Diameter preserving linear maps and isometries, II

    Indian Academy of Sciences (India)

    We study linear bijections of simplex spaces A ( S ) which preserve the diameter of the range, that is, the seminorm ϱ ( f ) = sup { | f ( x ) − f ( y ) | : x , y ∈ S } . Author Affiliations. Félix Cabello Sánchez1. Departamento de Matemáticas, Universidad de Extremadura, Avenida de Elvas 06071- Badajoz, Spain. Dates. Manuscript ...

  18. Multi-leg Seat Inventory Control Based on EMSU and Virtual Bucket

    Directory of Open Access Journals (Sweden)

    Wei Fan

    2014-01-01

    Full Text Available Expected marginal seat revenue (EMSR is a well-known method for airline seat inventory control airlines. However, this method employs a static model to study the dynamic reservation process, and does not take into account the risk tolerance of policy makers. Expected marginal seat utility (EMSU replaces revenue by utility, which addresses the real situation of seat inventory control. However, there is still a lack of multi-leg seat control algorithms based on EMSU. Therefore, using EMSU and bucket algorithms, this paper applies the Markov decision-making process to simulate the flight reservation process and builds a dynamic multi-leg seat inventory control model. Experimental results validate the effectiveness of the proposed method.

  19. Active control of an innovative seat suspension system with acceleration measurement based friction estimation

    Science.gov (United States)

    Ning, Donghong; Sun, Shuaishuai; Li, Hongyi; Du, Haiping; Li, Weihua

    2016-12-01

    In this paper, an innovative active seat suspension system for vehicles is presented. This seat suspension prototype is built with two low cost actuators each of which has one rotary motor and one gear reducer. A H∞ controller with friction compensation is designed for the seat suspension control system where the friction is estimated and compensated based on the measurement of seat acceleration. This principal aim of this research was to control the low frequency vibration transferred or amplified by the vehicle (chassis) suspension, and to maintain the passivity of the seat suspension at high frequency (isolation vibration) while taking into consideration the trade-off between the active seat suspension cost and its high frequency performance. Sinusoidal excitations of 1-4.5 Hz were applied to test the active seat suspension both when controlled and when uncontrolled and this is compared with a well-tuned passive heavy duty vehicle seat suspension. The results indicate the effectiveness of the proposed control algorithm within the tested frequencies. Further tests were conducted using the excitations generated from a quarter-car model under bump and random road profiles. The bump road tests indicate the controlled active seat suspension has good transient response performance. The Power Spectral Density (PSD) method and ISO 2631-1 standards were applied to analyse the seat suspension's acceleration under random road conditions. Although some low magnitude and high frequency noise will inevitably be introduced by the active system, the weighted-frequency Root Mean Square (RMS) acceleration shows that this may not have a large effect on ride comfort. In fact, the ride comfort is improved from being an 'a little uncomfortable' to a 'not uncomfortable' level when compared with the well-tuned passive seat suspension. This low cost active seat suspension design and the proposed controller with the easily measured feedback signals are very practical for real

  20. ACES II Seat Roller Study: Findings of Detrimental Friction under High Windblast or Adverse Flight Conditions

    Science.gov (United States)

    2015-08-12

    of 1500 lbf. 15. SUBJECT TERMS ACES-II, Ejection, Seat, Cam, Roller, Bearing, Friction, CKU-5, Rocket, Catapult , ROCAT 16. SECURITY CLASSIFICATION...Booster = solid propellant grain in the catapult of a ROCAT Catapult = the telescopic tube phase that lifts the ACES-II ejection seat within the...Criteria (0-1 scaled collation of individual-axis DRI) ROCAT = Rocket Catapult ejection propulsion system SBLAZ (g) = Seat Back Linear Accelerometer

  1. Race, belief in destiny, and seat belt usage: a pilot study.

    Science.gov (United States)

    Colón, I

    1992-01-01

    A survey of 1063 individuals found that when belief in destiny was statistically controlled, differences in seat belt use by race disappeared. Thus, racial differences in seat belt use are statistically accounted for and might be explained by belief in destiny. Efforts to increase seat belt use should target minority groups rather than include them in broadbrush programs. Further, these efforts should take into account this important difference in motivation. PMID:1585969

  2. Impact of seated and standing bicycle riding position on subsequent running performance

    OpenAIRE

    Jensen, Randall L.; Ewers, Brendon J.; Cunniffe, Brian; Phelan, Brian; Harrison, Andrew J.; Shafat, Amir

    2008-01-01

    peer-reviewed This study examined the effects of cycling posture on subsequent running performance similar to the transition phase of a triathlon. Experienced, non-elite triathletes completed two trials of a cycle-run transition. During the last three minutes of a 30 minute cycling bout, at power output equal to lactate threshold, subjects either remained seated (SEAT), or alternated seated and standing cycling (30 s at a time; ALT). Heart rate, RPE, minimum and maximum knee angle, stride ...

  3. Development of Methodology to Gather Seated Anthropometry Data in a Microgravity Environment

    Science.gov (United States)

    Rajulu, Sudhakar; Young, Karen; Mesloh, Miranda

    2010-01-01

    The Constellation Program is designing a new vehicle based off of new anthropometric requirements. These requirements specify the need to account for a spinal elongation factor for anthropometric measurements involving the spine, such as eye height and seated height. However, to date there is no data relating spinal elongation to a seated posture. Only data relating spinal elongation to stature has been collected in microgravity. Therefore, it was proposed to collect seated height in microgravity to provide the Constellation designers appropriate data for their analyses. This document will describe the process in which the best method to collect seated height in microgravity was developed.

  4. The Effects of Ejection Seat Cushion Design on Physical Fatigue and Cognitive Performance

    National Research Council Canada - National Science Library

    Pellettiere, Joseph; Parakkat, Julia; Reynolds, David; Sasidharan, Manikandan; El-Zoghbi, Muhamed; Oudenhuijzen, Aernout

    2006-01-01

    .... Subjective comfort survey data and cognitive performance data were gathered along with comparative objective data, including seated pressures, muscular fatigue levels, and lower extremity oxygen saturation...

  5. Car safety seat usage and selection among families attending University Hospital Limerick

    LENUS (Irish Health Repository)

    Scully, P

    2016-05-01

    The safest way for children to travel within a car is by provision of a weight-appropriate safety-seat. To investigate this, we conducted a cross-sectional study of adult parents who had children under 12 years, and collected information related to: car use, safety-seat legislation, and type of safety-seat employed. Data were reviewed on 120 children from 60 respondents. Ninety-eight (81.7%) children were transported daily by car. Forty-eight (81.4%) respondents were aware that current safety-seat legislation is based on the weight of the child. One hundred and seven (89.9%) children were restrained during travel using a car safety-seat. One hundred and two (96.2%) safety seats were newly purchased, installed in 82.3% (88) cases by family members with installation instructions fully read in 58 (55.2%) cases. Ninety-nine (83.2%) children were restrained using an appropriate safety-seat for their weight. The results show that four out of five families are employing the most appropriate safety-seat for their child, so providing an effective mechanism to reduce car-related injury. However, the majority of safety-seats are installed by family members, which may have child safety consequences.

  6. Coke from small-diameter tubes analyzed

    International Nuclear Information System (INIS)

    Albright, L.F.

    1988-01-01

    The mechanism for coke deposit formation and the nature of the coke itself can vary with the design of the ethylene furnace tube bank. In this article, coke deposits from furnaces with small-diameter pyrolysis tubes are examined. The samples were taken from four furnaces of identical design (Plant B). As in both the first and second installments of the series, the coke deposits were examined using a scanning electron microscope (SEM) and an energy dispersive X-ray analyzer (EDAX). The deposits from the small-diameter tubes are compared with the coke deposits from the furnace discussed in earlier articles. Analysis of the coke in both sets of samples are then used to offer recommendations for improved decoking procedures, operating procedures, better feed selection, and better selection of the metallurgy used in furnace tubes, to extend the operating time of the furnace tubes by reducing the amount and type of coke build up

  7. On finding minimum-diameter clique trees

    Energy Technology Data Exchange (ETDEWEB)

    Blair, J.R.S. (Tennessee Univ., Knoxville, TN (United States). Dept. of Computer Science); Peyton, B.W. (Oak Ridge National Lab., TN (United States))

    1991-08-01

    It is well-known that any chordal graph can be represented as a clique tree (acyclic hypergraph, join tree). Since some chordal graphs have many distinct clique tree representations, it is interesting to consider which one is most desirable under various circumstances. A clique tree of minimum diameter (or height) is sometimes a natural candidate when choosing clique trees to be processed in a parallel computing environment. This paper introduces a linear time algorithm for computing a minimum-diameter clique tree. The new algorithm is an analogue of the natural greedy algorithm for rooting an ordinary tree in order to minimize its height. It has potential application in the development of parallel algorithms for both knowledge-based systems and the solution of sparse linear systems of equations. 31 refs., 7 figs.

  8. SEAT BELT USE AMONG CAR USERS IN MALAYSIA

    OpenAIRE

    S. KULANTHAYAN

    2004-01-01

    The car is the second (40%) most common mode of transportation in Malaysia. In terms of fatal road accidents, car drivers constitute about 9.0% and passengers 13.6% of fatalities. The major cause of car occupants' fatality in such accidents is head injuries, which consist of more than half (56.4%) of the fatalities. Thus restraining the head and body, the initial position is the most important injury control strategy for car users. The use of seat belts was deemed one of the most effective wa...

  9. Rear-seat motor vehicle travel in the U.S.: using national data to define a population at risk.

    Science.gov (United States)

    Trowbridge, Matthew J; Kent, Richard

    2009-10-01

    Recent studies suggest that the relative protection offered by rear seating in motor vehicle crashes has decreased, potentially reflecting disproportionate advancements in front-seat safety technology. Safe adaptation of advanced front-seat restraint systems for the rear-seat environment will require exposure data that are currently unavailable. This study uses national data to quantify rear-seat occupancy patterns, restraint use, and annual travel exposure in the U.S. in order to support the development of advanced crash protection systems for rear-seat motor vehicle occupants. Data from the 2000-2006 National Automotive Sampling System Crashworthiness Data System and 2001 National Household Transportation Survey were analyzed in 2008 to quantify occupancy patterns (e.g., seat position, restraint use) and annual person-trips for rear-seat passengers in the U.S. The overall proportion of person-trips by rear-seat occupants is relatively low (12.9%); however national at-risk exposure remains significant (approximately 39 billion annual person-trips). Annual rear-seat travel exposure is similar among children < or = 12 years and adults (18.9 vs 19.1 billion person-trips) despite the fact that children are proportionally much more likely to ride in rear positions (79.3% vs 7.4%). Restraint use among adult rear-seat occupants was also much lower than among front-seat occupants (50.4% vs 82.2%). While rear-seat occupancy is relatively low compared with front-seat occupancy at-risk rear-seat travel by both child and adult passengers in the U.S. remains significant. Restraint use by rear-seat occupants is much lower than that among front-seat passengers, particularly among adults and older children, substantially increasing injury risk. Development of future crash protection systems for rear-seat passengers must account for these exposure patterns to ensure safe and effective integration into production vehicles.

  10. Carbon microtubes: tuning internal diameters and conical angles.

    Science.gov (United States)

    Bhimarasetti, Gopinath; Cowley, John M; Sunkara, Mahendra K

    2005-07-01

    In this paper, we report a synthesis strategy for a new class of hollow, curved carbon morphologies, 'carbon microtubes' (CMTs), with absolute control over their conical angles and internal diameters. Our synthesis methodology employs nitrogen or oxygen dosing to change the wetting behaviour of gallium metal with the growing carbon walls to tune the conical angles. Increasing N(2) concentrations in the gas phase during growth increases the conical angles of CMTs from +25° to about -20°. A methodology using the timing of oxygen or nitrogen dosing during CMT growth is shown to tune the internal diameters anywhere from a few nanometres to a few microns. The walls of the carbon microtubes are characterized using transmission electron microscopy (TEM) and Raman spectroscopy and are found to consist of aligned graphite nanocrystals (2-5 nm in size). Furthermore, dark field images of CMTs showed that the graphite nanocrystals are aligned with their c-axes perpendicular to the wall surface and that the crystals themselves are oriented with respect to the wall surface depending upon the conical angle of the CMT.

  11. Child car seats – a habitat for house dust mites and reservoir for harmful allergens

    Directory of Open Access Journals (Sweden)

    David Clarke

    2015-02-01

    Full Text Available [b]Introduction and objective[/b]. House dust mites produce allergens which can cause or aggravate diseases such as asthma, eczema and rhinitis. The objectives of this study are to quantify typical house dust mite and Der p 1 allergen levels in child car seats, and to determine external variables that may influence mite populations in cars. [b]Materials and Methods[/b]. Dust samples were collected from the child car seats and driver seats of 106 cars using a portable vacuum sampling pump over a two minute sampling period. Mites were counted and identified and results were expressed as mites per gram (mites/g of dust, while Der p 1 content of samples were measured by enzyme-linked immunosorbent assay (ELISA. Questionnaires were completed by participants to identify environmental and behavioural effects on mite populations. Results were analysed using General Linear Model (GLM procedures. [b]Results[/b]. Twelve species of mites, of which nine are known to produce harmful allergens, were recorded from 212 dust samples. Over 80% of drivers’ seats and over 77% of child car seats harboured dust mites with a significant correlation (p = 0.001 between the mites/g of dust and Der p 1 content recovered from each seat. A mean of 53 mites/g of dust per seat was recovered, with a mean Der p 1 level of 1.1µg/g. Over 12% of driver seats and 15% of child car seats contained house dust mite levels sufficient to be risk factors for sensitisation and allergic reactions. [b]Conclusions[/b]. Child car seats and driver seats are habitats to a range of mite species which can be present in sufficient concentrations to cause or aggravate allergen related illnesses in individuals who are genetically predisposed.

  12. Child car seats - a habitat for house dust mites and reservoir for harmful allergens.

    Science.gov (United States)

    Clarke, David; Gormally, Michael; Sheahan, Jerome; Byrne, Miriam

    2015-01-01

    House dust mites produce allergens which can cause or aggravate diseases such as asthma, eczema and rhinitis. The objectives of this study are to quantify typical house dust mite and Der p 1 allergen levels in child car seats, and to determine external variables that may influence mite populations in cars. Dust samples were collected from the child car seats and driver seats of 106 cars using a portable vacuum sampling pump over a two minute sampling period. Mites were counted and identified and results were expressed as mites per gram (mites/g) of dust, while Der p 1 content of samples were measured by enzyme-linked immunosorbent assay (ELISA). Questionnaires were completed by participants to identify environmental and behavioural effects on mite populations. Results were analysed using General Linear Model (GLM) procedures. Twelve species of mites, of which nine are known to produce harmful allergens, were recorded from 212 dust samples. Over 80% of drivers' seats and over 77% of child car seats harboured dust mites with a significant correlation (p = 0.001) between the mites/g of dust and Der p 1 content recovered from each seat. A mean of 53 mites/g of dust per seat was recovered, with a mean Der p 1 level of 1.1µg/g. Over 12% of driver seats and 15% of child car seats contained house dust mite levels sufficient to be risk factors for sensitisation and allergic reactions. Child car seats and driver seats are habitats to a range of mite species which can be present in sufficient concentrations to cause or aggravate allergen related illnesses in individuals who are genetically predisposed.

  13. The benefit of seat belt legislation in the United Kingdom.

    Science.gov (United States)

    McCarthy, M

    1989-09-01

    Legislation for compulsory wearing of seat belts by car drivers and front seat passengers has been acclaimed as a major public health advance. Reports from other countries, and two recent evaluative studies in the United Kingdom, have suggested that legislation reduces both deaths and injuries. To assess the effect of the UK law 5 years after its implementation, trends in routine data for 1976-1987 have been reviewed. There were two sources of data: mortality statistics, published by the Office of Population Censuses and Surveys in the quarterly Monitor DH4, and road accident statistics, recorded by the police and published by the Department of Transport. There is a downward trend in deaths over the period, but the data show little impact from the law. One explanation for this lack of effect is the risk compensation hypothesis, which suggests that "safety" improvements are transferred by drivers into increased performance--the amount and speed of travel. Public health policies need to take into account the complex behavioural interactions between travel and safety choices if they are to affect underlying trends.

  14. Ergonomic Assessment of a Seat Back Support (Spine Fit

    Directory of Open Access Journals (Sweden)

    Zeinab Kazemi1

    2014-04-01

    Full Text Available Background & Objectives : In case of inappropriateness of the dimensions of chairs or when users feel pain and pressure in their lumbar region due to poor posture, damage to the spine can be prevented using some additional supports. The aim of this study was ergonomic evaluation of one of these supportive products named “Spine Fit”. Methods : In this descriptive and cross-sectional study, in the first stage, five ergonomists evaluated the product regarding its dimension, adjustability, material, conformity, and manufacturer claims. Then, three groups of workers including office workers, office workers with low back pain, and bus drivers filled out a self-administered questionnaire after using Spine Fit . Results : For the first stage, an acceptable adjustability and dimension was found. Conformity for different kinds of office and bus seats was mostly fair. Findings from the second stage revealed that the subjects in three groups were satisfied regarding seats comfort and ease of use. Concerning the conformity of Spine Fit, it was in good level among office workers, while different levels of conformity were observed by drivers of different models of bus . Conclusion : Spine Fit supports back region based on its supportive role in pelvis, lumbar vertebrae column and thoracic spine. Moreover, Spine Fit features that reduce sweating can improve individuals’ convenience.

  15. Restaurant No. 1 seating capacity increases by 240

    CERN Multimedia

    Laëtitia Pedroso

    2010-01-01

    These days you need patience when looking for a seat in Restaurant No. 1 to eat your lunch. The opening of the new dining room, which will increase the restaurant’s seating capacity by 240, should alleviate the problem and improve service.   The new restaurant area. For the past several years the number of people using Restaurant No. 1 has grown steadily. Now, for a change, the restaurant itself is growing. Luz Lopez-Hernandez, leader of the project in the GS Department, explains: “Enlarging the restaurant has been on the GS Department's agenda for several years, but the project really got off the ground in 2009. Once it was approved and the design completed, construction itself only took seven months.” Seven months later, the restaurant extension is indeed on the verge of opening. One of the people who will be particularly happy is Joël Nallet, who manages the Novae restaurant: “I am thrilled, because until now, even if we managed to increase...

  16. Daylight And Seating Preference In Open-Plan Library Spaces

    Directory of Open Access Journals (Sweden)

    Zeynep Keskin

    2017-06-01

    Full Text Available Daylight factor has long been the predominant metric to evaluate daylight performance. Recently, the profession has moved toward annual dynamic daylight metrics such as useful daylight illuminance and daylight autonomy, which are based on absolute values of time varying daylight illuminance for a period of full year. As opposed to static daylight metrics that only concentrate on individual sky conditions, such as the widely used daylight factor, these metrics provide a more comprehensive way to measure illuminance for a wide range of sun positions and sky conditions. Although there is a growing consensus assigning importance to dynamic daylight metrics, there is no common understanding of how to integrate the preference and behaviour of building occupants in assessing the applicability of these metrics. In fact, it is when these occupancy observations and quantitative measurements are taken together that the importance of daylight performance metrics is fully realized. This study seeks to investigate the extent to which the influence of daylight on behaviour can be predicted, and for this the behaviour investigated is seating preferences of occupants in open plan, hot-desking spaces in two university libraries in Sheffield: Western Bank Library and the Information Commons. The results suggest that the association between daylight and seat choice may not be strong, and that any effect is better associated with daylight factor than with useful daylight illuminance or daylight autonomy.

  17. Development of a shear force measurement dummy for seat comfort.

    Directory of Open Access Journals (Sweden)

    Seong Guk Kim

    Full Text Available Seat comfort is one of the main factors that consumers consider when purchasing a car. In this study, we develop a dummy with a shear-force sensor to evaluate seat comfort. The sensor has dimensions of 25 mm × 25 mm × 26 mm and is made of S45C. Electroless nickel plating is employed to coat its surface in order to prevent corrosion and oxidation. The proposed sensor is validated using a qualified load cell and shows high accuracy and precision (measurement range: -30-30 N; sensitivity: 0.1 N; linear relationship: R = 0.999; transverse sensitivity: <1%. The dummy is manufactured in compliance with the SAE standards (SAE J826 and incorporates shear sensors into its design. We measure the shear force under four driving conditions and at five different speeds using a sedan; results showed that the shear force increases with speed under all driving conditions. In the case of acceleration and deceleration, shear force significantly changes in the lower body of the dummy. During right and left turns, it significantly changes in the upper body of the dummy.

  18. Development of a shear force measurement dummy for seat comfort.

    Science.gov (United States)

    Kim, Seong Guk; Ko, Chang-Yong; Kim, Dong Hyun; Song, Ye Eun; Kang, Tae Uk; Ahn, Sungwoo; Lim, Dohyung; Kim, Han Sung

    2017-01-01

    Seat comfort is one of the main factors that consumers consider when purchasing a car. In this study, we develop a dummy with a shear-force sensor to evaluate seat comfort. The sensor has dimensions of 25 mm × 25 mm × 26 mm and is made of S45C. Electroless nickel plating is employed to coat its surface in order to prevent corrosion and oxidation. The proposed sensor is validated using a qualified load cell and shows high accuracy and precision (measurement range: -30-30 N; sensitivity: 0.1 N; linear relationship: R = 0.999; transverse sensitivity: <1%). The dummy is manufactured in compliance with the SAE standards (SAE J826) and incorporates shear sensors into its design. We measure the shear force under four driving conditions and at five different speeds using a sedan; results showed that the shear force increases with speed under all driving conditions. In the case of acceleration and deceleration, shear force significantly changes in the lower body of the dummy. During right and left turns, it significantly changes in the upper body of the dummy.

  19. Fast and robust shape diameter function.

    Science.gov (United States)

    Chen, Shuangmin; Liu, Taijun; Shu, Zhenyu; Xin, Shiqing; He, Ying; Tu, Changhe

    2018-01-01

    The shape diameter function (SDF) is a scalar function defined on a closed manifold surface, measuring the neighborhood diameter of the object at each point. Due to its pose oblivious property, SDF is widely used in shape analysis, segmentation and retrieval. However, computing SDF is computationally expensive since one has to place an inverted cone at each point and then average the penetration distances for a number of rays inside the cone. Furthermore, the shape diameters are highly sensitive to local geometric features as well as the normal vectors, hence diminishing their applications to real-world meshes which often contain rich geometric details and/or various types of defects, such as noise and gaps. In order to increase the robustness of SDF and promote it to a wide range of 3D models, we define SDF by offsetting the input object a little bit. This seemingly minor change brings three significant benefits: First, it allows us to compute SDF in a robust manner since the offset surface is able to give reliable normal vectors. Second, it runs many times faster since at each point we only need to compute the penetration distance along a single direction, rather than tens of directions. Third, our method does not require watertight surfaces as the input-it supports both point clouds and meshes with noise and gaps. Extensive experimental results show that the offset-surface based SDF is robust to noise and insensitive to geometric details, and it also runs about 10 times faster than the existing method. We also exhibit its usefulness using two typical applications including shape retrieval and shape segmentation, and observe a significant improvement over the existing SDF.

  20. 29 mm Diameter Target Test Report

    Energy Technology Data Exchange (ETDEWEB)

    Woloshun, Keith Albert [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Olivas, Eric Richard [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Dale, Gregory E. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Naranjo, Angela Carol [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Romero, Frank Patrick [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Chemerisov, Sergey [Argonne National Lab. (ANL), Argonne, IL (United States); Gromov, Roman [Argonne National Lab. (ANL), Argonne, IL (United States)

    2017-10-23

    After numerous delays, the test of the 29 mm diameter target was conducted on 8/18/2017. The complete target design report, dated 8/15/2016, is reproduced below for completeness. This describes in detail the 10 disk target with varying thickness disks. The report presents and discusses the test results. In brief summary, there appears to have been multiple instrumentation errors. Measured temperatures, pressures and IR camera window temperature measurement are all suspect. All tests were done at 35 MeV, with 171 μA current, or 6 kW of beam power.

  1. The seating mechanics of head-neck modular tapers in vitro: Load-displacement measurements, moisture, and rate effects.

    Science.gov (United States)

    Ouellette, Eric S; Shenoy, Aarti A; Gilbert, Jeremy L

    2017-09-08

    The mechanically assisted crevice corrosion performance of head-neck modular tapers is a significant concern in orthopedic biomaterials. Fretting crevice corrosion processes in modular tapers are thought to be influenced by a wide array of factors including seating mechanics of the junction, hence there is a need for in vitro test methods that can assess their performance. This study presented a test method to directly measure the load-displacement seating mechanics of modular tapers and used this method to compare the seating mechanics for different tapers, moisture, seating loads and seating rates. Seating mechanics were explored whereby the instantaneous load-displacement behavior of the head seating onto the neck is captured and used to define the mechanics of seating. Two distinct taper design/material combinations were assembled wet or dry using axially applied loads (500, 1,000, 2,000, and 4,000 N) at two loading rates of 100 and 10 4  N/s (n = 5 for each condition) using a servohydraulic test frame. The results showed that pull-off strength scaled with seating load and ranged between 43% and 68% of seating load depending on sample and wetness. Tapers seated wet had higher pull-off strengths (2,200 ± 300 N) than those seated dry (1,800 ± 200 N, p mechanics (load-displacement plots) varied due to sample type and due to wetness with differences in seating energy, seating stiffness, and seating displacement. These results show the detailed mechanics of seating during assembly and provide significant insight into the complex interplay of factors associated with even "ideal" seating (axial, quasistatic) loading. © 2017 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 9999:1-9, 2018. © 2017 Orthopaedic Research Society. Published by Wiley Periodicals, Inc.

  2. Development of a Methodology to Gather Seated Anthropometry in a Microgravity Environment

    Science.gov (United States)

    Rajulu, Sudhakar; Young, Karen; Mesloh, Miranda

    2009-01-01

    The Constellation Program's Crew Exploration Vehicle (CEV) is required to accommodate the full population range of crewmembers according to the anthropometry requirements stated in the Human-Systems Integration Requirement (HSIR) document (CxP70024). Seated height is one of many critical dimensions of importance to the CEV designers in determining the optimum seat configuration in the vehicle. Changes in seated height may have a large impact to the design, accommodation, and safety of the crewmembers. Seated height can change due to elongation of the spine when crewmembers are exposed to microgravity. Spinal elongation is the straightening of the natural curvature of the spine and the expansion of inter-vertebral disks. This straightening occurs due to fluid shifts in the body and the lack of compressive forces on the spinal vertebrae. Previous studies have shown that as the natural curvature of the spine straightens, an increase in overall height of 3% of stature occurs which has been the basis of the current HSIR requirements. However due to variations in the torso/leg ratio and impact of soft tissue, data is nonexistent as to how spinal elongation specifically affects the measurement of seated height. In order to obtain this data, an experiment was designed to collect spinal elongation data while in a seated posture in microgravity. The purpose of this study was to provide quantitative data that represents the amount of change that occurs in seated height due to spinal elongation in microgravity environments. Given the schedule and budget constraints of ISS and Shuttle missions and the uniqueness of the problem, a methodology had to be developed to ensure that the seated height measurements were accurately collected. Therefore, simulated microgravity evaluations were conducted to test the methodology and procedures of the experiment. This evaluation obtained seat pan pressure and seated height data to a) ensure that the lap restraint provided sufficient

  3. High strength steels, stiffness of vehicle front-end structure, and risk of injury to rear seat occupants.

    Science.gov (United States)

    Sahraei, Elham; Digges, Kennerly; Marzougui, Dhafer; Roddis, Kim

    2014-05-01

    Previous research has shown that rear seat occupant protection has decreased over model years, and front-end stiffness is a possible factor causing this trend. In this research, the effects of a change in stiffness on protection of rear seat occupants in frontal crashes were investigated. The stiffness was adjusted by using higher strength steels (DP and TRIP), or thicker metal sheets. Finite element simulations were performed, using an LS Dyna vehicle model coupled with a MADYMO dummy. Simulation results showed that an increase in stiffness, to the extent it happened in recent model years, can increase the risk of AIS3+ head injuries from 4.8% in the original model (with a stiffness of 1,000 N/mm) to 24.2% in a modified model (with a stiffness of 2,356 N/mm). The simulations also showed an increased risk of chest injury from 9.1% in the original model to 11.8% in the modified model. Distribution of injuries from real world accident data confirms the findings of the simulations. Copyright © 2014 Elsevier Ltd. All rights reserved.

  4. Responses of the Q6/Q6s ATD Positioned in Booster Seats in the Far-Side Seat Location of Side Impact Passenger Car and Sled Tests.

    Science.gov (United States)

    Tylko, Suzanne; Bohman, Katarina; Bussières, Alain

    2015-11-01

    Passenger car side impact crash tests and sled tests were conducted to investigate the influence of booster seats, near-side occupant characteristics and vehicle interiors on the responses of the Q6/Q6s child ATD positioned in the rear, far-side seating location. Data from nine side impact sled tests simulating a EuroNCAP AEMD barrier test were analyzed with data obtained from 44 side impact crash tests. The crash tests included: FMVSS 214 and IIHS MDB, moving car-to-stationary car and moving car-to-moving car. A Q6 or prototype Q6s ATD was seated on the far-side, using a variety of low and high back booster seats. Head and chest responses were recorded and ATD motions were tracked with high-speed videos. The vehicle lateral accelerations resulting from MDB tests were characterized by a much earlier and more rapid rise to peak than in tests where the bullet was another car. The near-side seating position was occupied by a Hybrid III 10-year-old ATD in the sled tests, and a rear or front facing child restraint or a 5th percentile side impact ATD in the crash tests. Head impacts occurred more frequently in vehicles where a forward facing child restraint was present behind the driver seat for both the low and high back booster seats. Pretensioners were found to reduce lateral head displacements in all sled test configurations but the greatest reduction in lateral excursion was obtained with a high back booster seat secured with LATCH and tested in combination with pretensioners.

  5. The Role of Parents and Caregivers in Providing Safe Transportation for Occupants Seated in Wheelchairs

    Science.gov (United States)

    Schneider, Lawrence W.; Manary, Miriam; Bertocci, Gina

    2007-01-01

    The responsibility for providing safe transportation for travelers seated in wheelchairs is shared by many stakeholders, including wheelchair and tiedown/restraint manufacturers, vehicle modifiers and equipment installers, transit providers, rehabilitation technology suppliers, wheelchair/seating clinicians, and even informed and responsible…

  6. Effect of seat surface inclination on postural control during reaching in preterm children with cerebral palsy

    NARCIS (Netherlands)

    Hadders-Algra, Mijna; van der Heide, Jolanda C.; Fock, Johanna M.; Stremmelaar, Elisabeth; van Eykern, Leo A.; Otten, Bert

    Background and Purpose Because it is debatable whether seat surface inclination improves motor function in children with cerebral palsy (CP), the effect of seat surface tilting on postural control and quality of reaching was studied. Subjects The subjects were 58 children with CP aged 2 to 11 years

  7. 76 FR 31453 - Special Conditions: Gulfstream Model GVI Airplane; Single-Occupant Side-Facing Seats

    Science.gov (United States)

    2011-06-01

    ... apply to that model as well. Conclusion This action affects only certain novel or unusual design... single-occupant side-facing seats: A. The Injury Criteria 1. Existing Criteria: All injury protection criteria of Sec. 25.562(c)(1) through (c)(6) apply to the occupant of a side-facing seat. Head injury...

  8. 77 FR 64797 - Availability of Seats for the Gray's Reef National Marine Sanctuary Advisory Council

    Science.gov (United States)

    2012-10-23

    ..., pursuant to the council's Charter. The applicant chosen for the citizen-at-large seat should expect to... the Gray's Reef National Marine Sanctuary Advisory Council AGENCY: Office of National Marine... applications for the following vacant seats on the Gray's Reef National Marine Sanctuary Advisory Council: K...

  9. Pattern of seat belt use and its associated factors among taxi drivers ...

    African Journals Online (AJOL)

    Objective: Road traffic injuries constitute a major public health concern that demands effective interventions. Use of car seat belts is recommended as an effective intervention to reduce serious and fatal road traffic injuries. The study intended to investigate the pattern of seat belt use and its correlates among taxi drivers in ...

  10. China belting up or down? Seat belt wearing trends in Nanjing and Zhoushan.

    Science.gov (United States)

    Routley, Virginia; Ozanne-Smith, Joan; Li, Dan; Yu, Min; Wang, Jianyue; Zhang, Junhe; Tong, Zhendong; Wu, Ming; Wang, Peihua; Qin, Yu

    2008-11-01

    National seat belt wearing legislation became effective in China May 2004 and associated provincial and city regulations followed. Despite rapid motorisation seat belt studies in China have been scarce. Patterns and trends in urban seat belt wearing were observed for all driver, front and rear seating positions over the years 2005-2007 in two eastern cities Nanjing (Jiangsu Province) and Zhoushan (Zhejiang Province). There were 35,256 vehicles observed in Nanjing, 20,939 in Zhoushan and 95,933 occupants overall. Males dominated all seating positions, especially drivers. Seat belt wearing overall was significantly higher for drivers (49.9% Nanjing, 47.4% Zhoushan) than for front seat passengers (9.1% Nanjing, 1.0% Zhoushan) and virtually nonexistent for rear passengers (0.5% Nanjing, 0.2% Zhoushan). Generally levels declined significantly from year to year (drivers Nanjing 66.7%, 47.7%, 38.6%; Zhoushan 57.4%, 57.9%, 30.6%; front passengers Nanjing 19.2%, 6.6%, 3.2%). Zhoushan wearing did not initially decline, 2006 observations coinciding with anticipation of provincial regulations (July 2006). Observations revealed an absence of child restraints. Pretend wearing/belt tampering was observed almost exclusively in taxi drivers (14.2% of Nanjing taxi drivers, 11.3% of Zhoushan's). Awareness of and attitudes to urban seat belt laws should be investigated, appropriate countermeasures developed and enforcement reassessed.

  11. Flow Characteristics and Sizing of Annular Seat Valves for Digital Displacement Machines

    DEFF Research Database (Denmark)

    Nørgård, Christian; Bech, Michael Møller; Andersen, Torben O.

    2018-01-01

    This paper investigates the steady-state flow characteristics and power losses of annular seat valves for digital displacement machines. Annular seat valves are promising candidates for active check-valves used in digital displacement fluid power machinery which excels in efficiency in a broad op...

  12. 75 FR 16074 - Availability of Conservation Seat for the Flower Garden Banks National Marine Sanctuary Advisory...

    Science.gov (United States)

    2010-03-31

    ... Conservation Seat for the Flower Garden Banks National Marine Sanctuary Advisory Council AGENCY: Office of... ONMS is seeking applications for the following vacant seat on the Flower Garden Banks National Marine... 28, 2010. ADDRESSES: Application kits may be obtained from Jennifer Morgan, NOA- Flower Garden Banks...

  13. The effect of asymmetrical limited hip flexion on seating posture, scoliosis and windswept hip distortion.

    Science.gov (United States)

    Ágústsson, Atli; Sveinsson, Þórarinn; Rodby-Bousquet, Elisabet

    2017-12-01

    Postural asymmetries with seating problems are common in adults with cerebral palsy. To analyse the prevalence of asymmetrical limited hip flexion (90°. Asymmetrical limited hip flexion affects the seating posture and is associated with scoliosis and windswept hip distortion. Copyright © 2017 The Authors. Published by Elsevier Ltd.. All rights reserved.

  14. 78 FR 68748 - Federal Motor Vehicle Safety Standards; Designated Seating Positions

    Science.gov (United States)

    2013-11-15

    ... Volkswagen that sought additional lead time for implementing the new definition of ``designated seating... definition of the term, ``designated seating position,'' as used in the Federal motor vehicle safety... definition. The final rule made the new definition applicable to vehicles manufactured on and after September...

  15. Effects of heated seats in vehicles on thermal comfort during the initial warm-up period.

    Science.gov (United States)

    Oi, Hajime; Tabata, Koji; Naka, Yasuhito; Takeda, Akira; Tochihara, Yutaka

    2012-03-01

    Eight subjects participated in a subjective experiment of eight conditions to investigate the effects of heated seats in vehicles on skin temperature, thermal sensation and thermal comfort during the initial warm-up period. The experimental conditions were designed as a combination of air temperature in the test room (5, 10, 15, or 20 °C) and heated seat (on/off). The heated seat was effective for improving thermal comfort during the initial warm-up period when air temperature was lower than 15 °C. Use of heated seats prevented decreases in or increased toe skin temperature. Heated seats also increased foot thermal sensation at 15 and 20 °C. Optimal thermal sensation in contact with the seat was higher when air temperature was lower. Optimal skin temperature in contact with the seat back was higher than that with the seat cushion. Moreover, these optimal skin temperatures were higher when air temperature was lower. Copyright © 2011 Elsevier Ltd and The Ergonomics Society. All rights reserved.

  16. Sagittal Abdominal Diameter: Application in Clinical Practice

    Directory of Open Access Journals (Sweden)

    Thaís Da Silva-Ferreira

    2014-05-01

    Full Text Available Excess visceral fat is associated with cardiovascular risk factors. Sagittal abdominal diameter (SAD has recently been highlighted as an indicator of abdominal obesity, and also may be useful in predicting cardiovascular risk. The purpose of the present study was to review the scientific literature on the use of SAD in adult nutritional assessment. A search was conducted for scientific articles in the following electronic databases: SciELO , MEDLINE (PubMed and Virtual Health Library. SAD is more associated with abdominal fat (especially visceral, and with different cardiovascular risk factors, such as, insulin resistance, blood pressure, and serum lipoproteins than the traditional methods of estimating adiposity, such as body mass index and waist-to-hip ratio. SAD can also be used in association with other anthropometric measures. There are still no cut-off limits established to classify SAD as yet. SAD can be an alternative measure to estimate visceral adiposity. However, the few studies on this diameter, and the lack of consensus on the anatomical site to measure SAD, are obstacles to establish cut-off limits to classify it.

  17. The influence of seat adjustment and a thoraco-lumbar-sacral orthosis on the distribution of body-seat pressure in children with scoliosis and pelvic obliquity.

    Science.gov (United States)

    Shoham, Yehudit; Meyer, Shirley; Katz-Leurer, Michal; Tamar Weiss, Patrice L

    2004-01-07

    To determine the effect of a thoraco-lumbar-sacral orthosis (TLSO) on the distribution of body-seat interface pressure in children with concomitant scoliosis and pelvic obliquity and to determine the effects of two methods commonly used in customized seating--elevation (push up) of the lower side of the pelvis or a wedge insertion beneath the raised pelvis--on the distribution of body-seat interface pressure. The study population comprised 15 children with an underlying neuromuscular disorder. All had scoliosis and pelvic obliquity when seated, and used a TLSO during sitting. Body-seat interface pressure was measured using the QA Pad. Maximum pressure, mean pressure and contact area were recorded at baseline and at 10 degrees 'push up' and 10 degrees wedge insertion, with and without the TLSO. X-rays were performed with and without the orthosis at baseline position. The TLSO reduced the scoliosis deformity by a mean of 5.3 degrees and significantly (p pelvic obliquity was contralateral to the side of the curve. Seat adjustment did not have any significant effect on pressure readings. Application of a TLSO in a child with scoliosis and contralateral pelvic obliquity significantly reduced the spinal curvature and interface sitting pressure. Manipulation of sitting by use of wedges under the pelvis had no significant effect on pressure distribution.

  18. RESEARCH, APPROXIMATION OF CHARACTERISTICS OF PILLOWS OF SEATS AND INFLUENCE ON VIBRATION OF DRIVER OF TRUCK

    Directory of Open Access Journals (Sweden)

    V. G. Mikhailov

    2016-01-01

    Full Text Available Are considered a situation developed in the field of modelling of fluctuations of vehicles (truck, the attention on low vibroisolation properties of seats is focused. One of the reasons which the weak level of scrutiny of real characteristics of a pillow of a seat is. The technique of tests of pillows of seats is resulted, dependences of change of their parametres on a thickness of a layer pad of a pillow and a rubber category are received.The advanced mathematical model of a pillow of the seat, providing good coincidence of the peak-frequency characteristic in a strip of frequencies of 2–20 Hz and the block-schema of its realisation in package MATLAB\\SIMULIK is offered, allowing more to model fluctuations on a workplace of the driver of a vehicle more precisely. Pillow influence on vibration properties of seats is investigated.

  19. Effect of a Dynamic Seating Surface on Postural Control and Function in Children with Cerebral Palsy

    DEFF Research Database (Denmark)

    Meyer, Erna Rosenlund; Trew, Lisa

    Purpose: The purpose was to investigate if a seating system involving a dynamic material covering the seat back and base improves postural control, alignment and function in children with cerebral palsy and to investigate consequences of adapting The Seated Postural Control Measure to a target...... group with multifunctional disabilities. Relevance: Developing sitting systems for disabled persons is of great importance to avoid sitting problems, to increase the level of functioning and postural control which will have an impact on their daily living and activities. This project takes its starting...... Ethical Committee. Outcome measures were Seated Postural Control Measure (SPCM), which was modified to meet the children’s needs, was used to measure alignment and function. Force Sensitive Applications (FSA) on the seat surfaces was used to measure postural movements and interface pressure. All tests...

  20. Seat belt use among car drivers in Iranian safe communities: An observational study.

    Science.gov (United States)

    Torkamannejad Sabzevari, Javad; Khanjani, Narges; Molaei Tajkooh, Ali; Nabipour, Amir Reza; Sullman, Mark J M

    2016-01-01

    The number of road traffic injuries and fatalities in Iran is high. The aim of the present study was to investigate the rate of drivers' seat belt use and a number of related factors in Kashmar, Bardaskan, and Khalilabad (Iranian Safe Communities). In 2014, driver observations were made at 48 road sites on intercity roads, main streets, side streets, and rural roads in these 3 cities. A total of 10,255 vehicles were observed, with the overall rate of seat belt use being 51.8%. The rates in Kashmar, Bardaskan, and Khalilabad were 51.4, 56.3, and 47.7%, respectively. In Kashmar, the odds of seat belt use were higher among drivers who were female, older, and taxi drivers. Higher use was also found during the afternoon, and lower use was observed on rural roads. In Khalilabad the odds of seat belt use were higher among females, older drivers, taxis, and private car drivers. Seat belt use was also higher on weekends and during the morning but was significantly lower on rural roads. Similarly, in Bardaskan the odds of using a seat belt were higher among females, older drivers, taxis, and private car drivers. Seat belt use was also higher during the afternoon but was significantly lower on rural roads, in comparison to main streets and intercity roads. The rate of seat belt use in these 3 cities was found to be low, despite these cities being designated as International Safe Communities. Therefore, seat belt promotion programs, tougher regulations, stronger enforcement, public awareness campaigns, and more research are needed to promote seat belt use in these Iranian cities.

  1. Optimization of Car Seats in the Interaction of Sitting Man on the Size of the Contact Pressure

    Science.gov (United States)

    Martonka, R.; Fliegel, V.

    The crew vehicle, the driver and passengers are in a car in direct interaction with the car seat while driving, which affects a sitting person in many areas such as safety, comfort, a feeling of comfort and customization to individual requirements, ergonomics and variability. All these effects are caused by one or a group of elements used in the construction of the seat. Objective assessment of the requirements for the construction of car seats, regardless of the characteristics of the occupant is not possible to provide a subjective feeling of comfort for any seated person. Therefore, we include in the design of automotive seat occupant's subjective feelings. It is clear that car seats must "adapt" individual characteristics of a seated man (weight, corpulence, age, gender,…). One of the subjective feelings of a man sitting in the seat is comfortable for any seated person defined differently. Correlation was found between comfort seats and contact pressure distribution depending on the weight of a seated man. It is understandable that every sitting person has a different distribution of contact pressure. This has resulted in the same seat each person differently seems comfortable-hard. The research objective is always to ensure maximum contact area for any seated person. Parameter that must be optimized is the hardness of butt pads sitting person (usually polyurethane pad coated fabric cover).In the conventional design seat cushion hardness is fixed, without the possibility of adaptability by the individuality sitting man. This article deals with the assessment, definition and optimization of hardness of pad in the automobile seat, the contact pressure distribution and determining the regulatory range of hardness depending on the weight of a seated man.

  2. Social prejudice hindering proper use of car safety seats.

    Science.gov (United States)

    Kanburoglu, Mehmet Kenan; Cizmeci, Mehmet Nevzat; Akelma, Ahmet Zulfikar; Orun, Emel; Yesilyurt, Kubra; Tatli, Mustafa Mansur

    2013-12-01

    The compliance of parents with child passenger safety (CPS) has been mainly explained by their level of knowledge. Social, ethnic and cultural factors have not been investigated in detail. This study investigated the rate of compliance of parents with CPS guidelines, as well as the factors hindering it. Parents of infants aged 2-10 days were enrolled. The proportions of families obtaining a car safety seat (CSS; 57%) and complying with CPS recommendations (2%) were very low. Most of the parents thought CSS were harmful for infants (mother, 57%; father, 63%), despite having already purchased one. Parents believed their children to be too small to use CSS and cannot sit in CSS because they should lie flat on their backs at all times. These prejudices may be due to the social and cultural circumstances specific to Turkey, or corresponding findings may be found in countries with similar socioeconomic status. © 2013 The Authors. Pediatrics International © 2013 Japan Pediatric Society.

  3. Airflow Characteristics at the Breathing Zone of a Seated Person

    DEFF Research Database (Denmark)

    Melikov, Arsen Krikor; Bolashikov, Zhecho Dimitrov; Nagano, Hideaki

    2011-01-01

    A method for active control over the interaction between the free convection flow around occupant‘s body and locally applied airflow from front on the velocity field at the breathing zone of a seated person was studied. A workplace equipped with personalised ventilation (PV) generating flow from......) was installed below the table board, above the thighs of the manikin, and was used to exhaust the air of the free convection flow coming from the lower body parts of the manikin. The velocity field at the breathing zone was measured with Particle Image Velocimetry consisting of a dual cavity laser and two CCD...... at 4 L/s resulted in the same velocity at the breathing zone as when only PV was used at 6 L/s. The maximum absolu...

  4. Hardfacing materials used in valves for seating and wear surfaces

    Energy Technology Data Exchange (ETDEWEB)

    Knecht, W.G.

    1996-12-01

    Most valves and essentially all critical service valves utilize hardfacing materials for seating and wear surfaces to minimize wear and galling. The type of hardfacing materials used, the methods of deposition, and the quality of the final product all contribute to the wear characteristics, required operating force, and life of the final product. Over the last forty years the most prevalent hardfacing materials furnished to the commercial nuclear industry consisted of cobalt base and nickel base materials. In the last several years there has been extensive development and evaluation work performed on iron base hardfacing materials. This presentation will address the wear characteristics of the various materials and the importance of consistent quality of deposited materials necessary to achieve optimum product performance and longevity.

  5. Classroom ecology: relations between seating location, performance, and attendance.

    Science.gov (United States)

    Marshall, P Douglas; Losonczy-Marshall, Marta

    2010-10-01

    Data from 70 classes and 1829 students over a period of 15 years were analyzed. Grade and attendance differences were analyzed for five different seating configurations: by row, by column, the front of the room versus the back of the room, the center of the room versus the perimeter of the room, and the middle of the room versus the sides of the room. Results utilizing numeric percentage grades and attendance percentages indicated students sitting in the more central parts of the class had higher percentage grades and attended classes more frequently than those students sitting in the less central parts of the class. Women attended class more frequently than men, yet there were no sex differences on grades.

  6. A parametric model of child body shape in seated postures.

    Science.gov (United States)

    Park, Byoung-Keon D; Ebert, Sheila; Reed, Matthew P

    2017-07-04

    The shape of the current physical and computational surrogates of children used for restraint system assessments is based largely on standard anthropometric dimensions. These scalar dimensions provide valuable information on the overall size of the individual but do not provide good guidance on shape or posture. This study introduced the development of a parametric model that statistically predicts individual child body shapes in seated postures with a few given parameters. Surface geometry data from a laser scanner of children ages 3 to 11 (n = 135) were standardized by a 2-level fitting method using intermediate templates. The standardized data were analyzed by principal component analysis (PCA) to efficiently describe the body shape variance. Parameters such as stature, body mass index, erect sitting height, and 2 posture variables related to torso recline and lumbar spine flexion were associated with the PCA model using regression. When the original scan data were compared with the predictions of the model using the given subject dimensions, the average root mean square error for the torso was 9.5 mm, and the 95th percentile error was 17.35 mm. For the first time, a statistical model of child body shapes in seated postures is available. This parametric model allows the generation of an infinite number of virtual children spanning a wide range of body sizes and postures. The results have broad applicability in product design and safety analysis. Future work is needed to improve the representation of hands and feet and to extend the age range of the model. The model presented in this article is publicly available online through HumanShape.org.

  7. Nonconformities in real-world fatal crashes--electronic stability control and seat belt reminders.

    Science.gov (United States)

    Lie, Anders

    2012-01-01

    Many new safety systems are entering the market. Vision Zero is a safety strategy aiming at the elimination of fatalities and impairing injuries by the use of a holistic model for safe traffic to develop a safe system. The aim of this article is to analyze fatalities in modern cars with respect to the Vision Zero model with special respect to electronic stability control (ESC) systems and modern seat belt reminders (SBRs). The model is used to identify and understand cases where cars with ESC systems lost control and where occupants were unbelted in a seat with seat belt reminders under normal driving conditions. The model for safe traffic was used to analyze in-depth studies of fatal crashes with respect to seat belt use and loss of control. Vehicles from 2003 and later in crashes from January 2004 to mid-2010 were analyzed. The data were analyzed case by case. Cars that were equipped with ESC systems and lost control and occupants not using the seat belt in a seat with a seat belt reminder were considered as nonconformities. A total of 138 fatal crashes involving 152 fatally injured occupants were analyzed. Cars with ESC systems had fewer loss-of-control-relevant cases than cars without ESC systems. Thirteen percent of the ESC-equipped vehicles had loss-of-control-relevant crashes and 36 percent of the cars without ESC systems had loss-of-control-relevant crashes. The analysis indicates that only one car of the 9 equipped with ESC that lost control did it on a road surface with relevant friction when driving within the speed restriction of the road. In seats with seat belt reminders that are in accordance with the European New Car Assessment Programme's (Euro NCAP) protocol, 93 percent of the occupants were using a seat belt. In seats without reminders this number was 74 percent. This study shows that ESC systems result in a very significant reduction in fatal crashes, especially under normal driving conditions. Under extreme driving conditions such as speeding

  8. An Active Seat Controller with Vehicle Suspension Feedforward and Feedback States: An Experimental Study

    Directory of Open Access Journals (Sweden)

    Abdulaziz Alfadhli

    2018-04-01

    Full Text Available Active seat suspensions can be used to reduce the harmful vertical vibration of a vehicle’s seat by applying an external force using a closed loop controller. Many of the controllers found in the literature are difficult to implement practically, because they are based on using unavailable or difficult and costly measurements. This paper presents both simulation and experimental studies of five novel, simple, and cost-effective control strategies to be used for an active seat suspension in order to improve ride comfort at low frequencies below 20 Hz. These strategies use available and measurable feedforward (preview information states from the vehicle secondary suspension, as well as feedback states from the seat suspension, together with gains optimised to minimise the occupant vibration. The gains were optimised using a genetic algorithm (GA, with a fitness function based on the seat effective amplitude transmissibility (SEAT factor. Constraints on the control force and the seat suspension stroke were also included in the optimisation algorithm. Simulation and laboratory experimental tests were carried out to assess the performance of the proposed controllers according to the ISO 2631-1 standard, in both the frequency and time domains with a range of different road profiles. The experimental tests were performed using a multi-axis simulation table (MAST and a physical active seat suspension configured as a hardware-in-loop (HIL simulation with a virtual linear quarter vehicle model (QvM. The results demonstrate that the proposed controllers substantially attenuate the vertical vibration at the driver’s seat compared with both a passive and a proportional-integral-derivative (PID active seat suspension and thus improve ride comfort together with reducing vibration-linked health risks. Moreover, experimental results show that employing both feedforward information and feedback vehicle body and seat acceleration signals in the controller

  9. Naturalistic driving study of rear seat child occupants: Quantification of head position using a Kinect™ sensor.

    Science.gov (United States)

    Arbogast, Kristy B; Kim, Jinyong; Loeb, Helen; Kuo, Jonny; Koppel, Sjaan; Bohman, Katarina; Charlton, Judith L

    2016-09-01

    Restraint performance is evaluated using anthropomorphic test devices (ATDs) positioned in prescribed, optimal seating positions. Anecdotally, humans-children in particular-assume a variety of positions that may affect restraint performance. Naturalistic driving studies (NDSs), where cameras and other data acquisition systems are placed in a vehicle used by participants during their regular transportation, offer means to collect these data. To date, these studies have used conventional video and analysis methods and, thus, analyses have largely been qualitative. This article describes a recently completed NDS of child occupants in which their position was monitored using a Kinect sensor to quantify their head position throughout normal, everyday driving trips. A study vehicle was instrumented with a data acquisition system to measure vehicle dynamics, a set of video cameras, and a Kinect sensor providing 3D motion capture at 1 Hz of the rear seat occupants. Participant families used the vehicle for all driving trips over 2 weeks. The child occupants' head position was manually identified via custom software from each Kinect color image. The 3D head position was then extracted and its distribution summarized by seat position (left, rear, center) and restraint type (forward-facing child restraint system [FFCRS], booster seat, seat belt). Data from 18 families (37 child occupants) resulted in 582 trips (with children) for analysis. The average age of the child occupants was 45.6 months and 51% were male. Twenty-five child occupants were restrained in FFCRS, 9 in booster seats, and 3 in seat belts. As restraint type moved from more to less restraint (FFCRS to booster seat to seat belt), the range of fore-aft head position increased: 218, 244, and 340 mm on average, respectively. This observation was also true for left-right movement for every seat position. In general, those in the center seat position demonstrated a smaller range of head positions. For the first

  10. Comparative Performance of Rear Facing Child Restraint Systems on the CMVSS 213 Bench and Vehicle Seats

    Science.gov (United States)

    Tylko, Suzanne; Locey, Caitlin M.; Garcia-Espana, J. Felipe; Arbogast, Kristy B.; Maltese, Matthew R.

    2013-01-01

    The purpose of this study was to compare the dynamic response of rear-facing child restraint systems (RFCRS) installed on the CMVSS 213 sled bench and a selection of vehicle seats. Thirty-six sled tests were conducted: three models of rear facing CRS with an anthropomorphic test device (ATD) representing a 12 month old child (CRABI) were affixed via lower anchors (LATCH), 3 point belt without CRS base, and 3 point belt with CRS base to one of three vehicle seats or the CMVSS 213 bench seat. All CRS were subjected to an identical sled acceleration pulse. Two types of matched pair analysis: “bench-to-vehicle” and “method of attachment” were conducted. Statistically significant differences were observed in the kinematic responses of the ATD and the CRS. This is the first study to quantify differences between the regulatory bench and vehicle seats on a system level and evaluate the influence of attachment method. Our results show that the difference in RFCRS forward excursion between 3-point belt with base and LATCH installations was between 1 and 7 percent on the bench and 22 to 76 percent on the vehicle seats. When evaluating the dynamic performance of RFCRS, the use of real vehicle seats from vehicles that commonly carry children may provide valuable insight. The findings would require further confirmation using a broader selection of RFCRS and vehicle seats, before generalizable conclusions can be drawn. PMID:24406967

  11. The effect of seating preferences of the medical students on educational achievement.

    Science.gov (United States)

    Zomorodian, Kamiar; Parva, Mohammad; Ahrari, Iman; Tavana, Samar; Hemyari, Camellia; Pakshir, Keyvan; Jafari, Peyman; Sahraian, Ali

    2012-01-01

    The seat selection and classroom dynamics may have mutual influence on the student performance and participation in both assigned and random seating arrangement. The aim of the study was to understand the influence of seat selection on educational achievement. The seating positions of the medical students were recorded on an architectural plan during each class session and the means and standard deviations of the students' locations were calculated in X and Y orientations. The locations of the students in the class were analyzed based on three architectural classifications: interactional zone, distance from the board, and access to the aisles. Final exam scores were used to measure the students' educational achievement. Our results demonstrate that there is a statistically significant relationship between the student's locations in the class and their attendance and educational achievements. two factors may effect on educational achievement: student seating in the high interactional zone and minimal changes in seating location. Seating in the high interaction zone was directly associated with higher performance and inversely correlated with the percentage of absences. This observation is consistent with the view that students in the front of the classroom are likely more motivated and interact with the lecturer more than their classmates.

  12. Physiological Motion Axis for the Seat of a Dynamic Office Chair

    Science.gov (United States)

    Kuster, Roman Peter; Bauer, Christoph Markus; Oetiker, Sarah; Kool, Jan

    2016-01-01

    Objective The aim of this study was to determine and verify the optimal location of the motion axis (MA) for the seat of a dynamic office chair. Background A dynamic seat that supports pelvic motion may improve physical well-being and decrease the risk of sitting-associated disorders. However, office work requires an undisturbed view on the work task, which means a stable position of the upper trunk and head. Current dynamic office chairs do not fulfill this need. Consequently, a dynamic seat was adapted to the physiological kinematics of the human spine. Method Three-dimensional motion tracking in free sitting helped determine the physiological MA of the spine in the frontal plane. Three dynamic seats with physiological, lower, and higher MA were compared in stable upper body posture (thorax inclination) and seat support of pelvic motion (dynamic fitting accuracy). Spinal kinematics during sitting and walking were compared. Results The physiological MA was at the level of the 11th thoracic vertebra, causing minimal thorax inclination and high dynamic fitting accuracy. Spinal motion in active sitting and walking was similar. Conclusion The physiological MA of the seat allows considerable lateral flexion of the spine similar to walking with a stable upper body posture and a high seat support of pelvic motion. Application The physiological MA enables lateral flexion of the spine, similar to walking, without affecting stable upper body posture, thus allowing active sitting while focusing on work. PMID:27150530

  13. Effects of heated seat and foot heater on thermal comfort and heater energy consumption in vehicle.

    Science.gov (United States)

    Oi, Hajime; Yanagi, Kotaro; Tabata, Koji; Tochihara, Yutaka

    2011-08-01

    Subjective experiments involving 12 different conditions were conducted to investigate the effects of heated seats and foot heaters in vehicles on thermal sensation and thermal comfort. The experimental conditions involved various combinations of the operative temperature in the test room (10 or 20°C), a heated seat (on/off) and a foot heater (room operative temperature +10 or +20°C). The heated seat and foot heater improved the occupant's thermal sensation and comfort in cool environments. The room operative temperature at which the occupants felt a 'neutral' overall thermal sensation was decreased by about 3°C by using the heated seat or foot heater and by about 6°C when both devices were used. Moreover, the effects of these devices on vehicle heater energy consumption were investigated using simulations. As a result, it was revealed that heated seats and foot heaters can reduce the total heater energy consumption of vehicles. Statement of Relevance: Subjective experiments were conducted to investigate the effects of heated seats and foot heaters in vehicles on thermal comfort. The heated seat and foot heater improved the occupant's thermal sensation and comfort in cool environments. These devices can reduce the total heater energy consumption in vehicles.

  14. Measuring static seated pressure distributions and risk for skin pressure ulceration in ice sledge hockey players.

    Science.gov (United States)

    Darrah, Shaun D; Dicianno, Brad E; Berthold, Justin; McCoy, Andrew; Haas, Matthew; Cooper, Rory A

    2016-01-01

    To determine whether sledge hockey players with physical disability have higher average seated pressures compared to non-disabled controls. Fifteen age-matched controls without physical disability and 15 experimental participants with physical disability were studied using a pressure mapping device to determine risk for skin pressure ulceration and the impact of cushioning and knee angle positioning on seated pressure distributions. Regardless of participant group, cushioning, or knee angle, average seated pressures exceeded clinically acceptable seated pressures. Controls had significantly higher average seated pressures than the disability group when knees were flexed, both with the cushion (p = 0.013) and without (p = 0.015). Knee extension showed significantly lower average pressures in controls, both with the cushion (p hockey players utilize positioning with larger knee flexion angles. Implications for Rehabilitation Ice sledge hockey is a fast growing adaptive sport. Adaptive sports have been associated with several positive improvements in overall health and quality of life, though may be putting players at risk for skin ulceration. Measured static seated pressure in sledges greatly exceeds current clinically accepted clinical guidelines. With modern improvements in wheelchair pressure relief/cushioning there are potential methods for improvement of elevated seated pressure in ice hockey sledges.

  15. Biomechanical investigation of prolonged driving in an ergonomically designed truck seat prototype.

    Science.gov (United States)

    Cardoso, Michelle; McKinnon, Colin; Viggiani, Dan; Johnson, Michel J; Callaghan, Jack P; Albert, Wayne J

    2018-03-01

    A postural evaluation during a prolonged driving task was conducted to determine the ergonomic validity of a new freely adjustable truck seat prototype. Twenty participants were recruited to perform two 2-h simulated driving sessions. Postures were assessed using motion capture, accelerometers and pressure pads. Subjective discomfort was also monitored in 15-min increments using ratings of perceived discomfort (RPD) and the Automotive Seating Discomfort Questionnaire. Participants had a more neutral spine posture during the first hour of the drive and reported lower RPDs while sitting in the prototype. Pairing the gluteal backrest panel with the adjustable seat pan helped reduce the average sitting pressure. The industry-standard truck seat may lead to the development of poor whole body posture, and the proposed ergonomic redesign of a new truck seat helped improve sitting posture and reduce perceived discomfort. Practitioner Summary: A new freely adjustable truck seat prototype was compared to an Industry standard seat to assess hypothesised improvements to sitting posture and discomfort for long haul driving. It was found that the adjustable panels in the prototype helped promote spine posture, reduce sitting pressure and improved discomfort ratings.

  16. Bidet toilet seats with warm-water tanks: residual chlorine, microbial community, and structural analyses.

    Science.gov (United States)

    Iyo, Toru; Asakura, Keiko; Nakano, Makiko; Yamada, Mutsuko; Omae, Kazuyuki

    2016-02-01

    Despite the reported health-related advantages of the use of warm water in bidets, there are health-related disadvantages associated with the use of these toilet seats, and the bacterial research is sparse. We conducted a survey on the hygienic conditions of 127 warm-water bidet toilet seats in restrooms on a university campus. The spray water from the toilet seats had less residual chlorine than their tap water sources. However, the total viable microbial count was below the water-quality standard for tap water. In addition, the heat of the toilet seats' warm-water tanks caused heterotrophic bacteria in the source tap water to proliferate inside the nozzle pipes and the warm-water tanks. Escherichia coli was detected on the spray nozzles of about 5% of the toilet seats, indicating that the self-cleaning mechanism of the spray nozzles was largely functioning properly. However, Pseudomonas aeruginosa was detected on about 2% of the toilet seats. P. aeruginosa was found to remain for long durations in biofilms that formed inside warm-water tanks. Infection-prevention measures aimed at P. aeruginosa should receive full consideration when managing warm-water bidet toilet seats in hospitals in order to prevent opportunistic infections in intensive care units, hematology wards, and other hospital locations.

  17. Compliance with seat belt use in makurdi, Nigeria: an observational study.

    Science.gov (United States)

    Popoola, So; Oluwadiya, Ks; Kortor, Jn; Denen-Akaa, P; Onyemaechi, Noc

    2013-07-01

    Seat belts are designed to reduce injuries due to road crash among vehicle occupants. This study aims to determine the availability of seat belt in vehicles and compliance with seat belt use among vehicle occupants. This was a 24-h direct observational study of seat belt usage among vehicle occupants in Makurdi, Benue State, Nigeria. By direct surveillance and using a datasheet, we observed 500 vehicles and their occupants for seat belt availability and compliance with its use. Chi-square test was used for test of significance between variables. Twenty-five (5.0%) of the observed 500 vehicles had no seat belt at all. Overall, compliance was 277/486 (57.0%). Use of seat belt was highest in the afternoon with 124/194 (64.4%), followed by 111/188 (59.0%) in the morning and 42/95 (44.2%) at night. Compliance was highest among car occupants [209/308 (67.9%)] and private vehicles, and lowest among commercial vehicle occupants. Compliance among female drivers was 77.1% compared with 51.4% among male drivers. Among drivers, the mean age of seat belt users was 38.4 (7.7) years, which was significantly younger than the 41.3 (8.7) years mean age of non-users. Similar figures were obtained among other vehicle occupants. Compared with previous studies, seat belt usage has improved among Nigerian road users, but there is still room for improvement, especially early in the mornings and at nights. Since these were times when law enforcement agencies were not likely to be on the roads, we advocate for improved coverage by enforcement agents to enforce better compliance.

  18. Correlation of spine deformity, lung function, and seat pressure in spina bifida.

    Science.gov (United States)

    Patel, Jayesh; Walker, Janet L; Talwalkar, Vishwas R; Iwinski, Henry J; Milbrandt, Todd A

    2011-05-01

    Spinal deformity, a common problem in children with myelodysplasia, is associated with alterations in pulmonary function and sitting balance. Sitting imbalance causes areas of high pressure in patients already at high risk for developing pressure ulcers due to insensate skin. We asked: Does spinal deformity affect pulmonary function tests in children with myelodysplasia? Does the magnitude of spinal curvatures and pelvic obliquity affect seating pressures? Does spinal deformity and seated pressures correlate with a history of pressure ulcers? We retrospectively reviewed 32 patients with myelodysplasia and scoliosis (mean age, 14 years). The mean thoracic scoliosis was 64° with a mean pelvic obliquity of 15°. The mean forced vital capacity was 59% of predicted. The mean of the average and peak seated pressures were 24 and 137 mm Hg, respectively. We examined spinal radiographs, pulmonary function tests, and seated pressure maps and evaluated correlations of spinal deformity measures, pulmonary function, and seated pressures. The thoracic scoliosis inversely correlated with lung volume and weakly related with only the forced midexpiratory volume parameter (R(2) = 31%). The curve magnitude was associated with % seated area with pressures of 38 to 70 mm Hg while lesser degrees of pelvic obliquity were associated with % seating area with pressures of less than 38 mm Hg (R(2) = 25% and 24%, respectively). A history of pressure ulcers did not correlate with any spinal deformity or seated pressure measures. All patients displayed a reduced forced vital capacity, but this reduction was not related to increasing scoliosis. The smaller scoliosis curves and lesser degrees of pelvic obliquity were associated with larger areas of low seated pressures.

  19. An online means of testing asymmetries in seating preference reveals a bias for airplanes and theaters.

    Science.gov (United States)

    Nicholls, Michael E R; Thomas, Nicole A; Loetscher, Tobias

    2013-08-01

    The aim of this study was to investigate asymmetrical interactions between humans and their environment using online seat booking sites. Functional differences between the cerebral hemispheres affect the choices people make. For example, when asked to imagine going to a cinema, people preferentially select seats to the right We investigated whether this experimental research generalizes to online booking sites for aircraft and theaters. Occupancy rates for seats taken on the left and right sides were assessed for 100 airline flights with 12,762 available seats and 37 theater performances with 34,456 seats. On the basis of previous research, a rightward bias was predicted for aircraft and theaters. For aircraft, contrary to expectation, occupancy rate was higher for left- compared with right-side seats. For theaters, a rightward bias was observed when the theater was less than half full.The bias was not affected by the orientation of the map. For aircraft, the leftward preference could be attributable to a rightward turning bias or a "feeling" that the port seats are closer to the exit, even though they are not. For theaters, the data demonstrate that the rightward preference observed in earlier studies exists only when the theater is relatively empty. Asymmetrical seating may play an important role in the efficient assimilation of information from the environment, and this role should take this into account when designing effective human-environment interfaces.The online method of assessing seating used in the current study provides an informative and potentially powerful means of assessing asymmetries in human perception and action.

  20. Occupant Kinematics in Simulated Autonomous Driving Vehicle Collisions: Influence of Seating Position, Direction and Angle.

    Science.gov (United States)

    Kitagawa, Yuichi; Hayashi, Shigeki; Yamada, Katsunori; Gotoh, Mitsuaki

    2017-11-01

    This two-part study analyzed occupant kinematics in simulated collisions of future automated driving vehicles in terms of seating configuration. In part one, a frontal collision was simulated with four occupants with the front seats reversed. The left front seat occupant was unbelted while the others were belted. In part two of the study, occupant restraint was examined in various seating configurations using a single seat model with a three-point seatbelt. The seat direction with respect to impact was considered as forward, rearward, and lateral facing in 45 degree increments. The effect of seat recline was also studied in the forward-facing and rear-facing cases by assuming three positions: driving position, resting position and relaxed position. Occupants were represented by human body finite element models. The results of part one showed that the front seat (rear-facing) occupants were restrained by the seatback, resulting in T1 forward displacement less than 100 mm; the rear seat occupants were restrained by the seatbelt resulting larger T1 forward displacement more than 500 mm. The results of the part two showed the directional dependence of occupant restraint. Greater T1 displacements were observed when the occupant faced lateral or front oblique. However, the seatbelt provided some restraint in all directions considered. The seatback generated contact force to the occupant when it was in the impact direction, including the lateral directions. The relaxed position allowed increased excursion compared to the driving position when the occupant faced rearward, but the magnitude of this increase was lower with lower impact speed.

  1. Packing configuration performance for small stem diameters

    International Nuclear Information System (INIS)

    Aikin, J.A.; Spence, C.G.; Cumming, D.

    1997-01-01

    The extensive use of graphite packing and its excellent track record for large isolating valves in CANDU, Primary Heat Transfer (PHT) systems has resulted in an increased application of graphite packing on the conventional side. Many of these applications are in air operated valves (AOVs) where the packing sets are used on small stem diameters (<1 inch) with frequent short-cycling strokes (± 10% of full stroke). The direct application of the proven packing configurations for large isolated valves to control valve application has generated problems such as stiction, packing wear and, in isolated cases, stem stall. To address this issue, a test program was conducted at AECL, CRL by MED branch. The testing showed that by reconfiguring the packing sets and using PTFE wafers reductions in stem friction of 50% at ambient conditions, a 3 fold at hot conditions are achievable. The test program also demonstrated benefits gained in packing wear with different stem roughness finishes and the potential need to exercise small stems valves that see less than full stroke cycling. The paper describes the tests results and provides field support experience. (author)

  2. M2-F1 ejection seat test at South Edwards

    Science.gov (United States)

    1963-01-01

    The M2-F1 was fitted with an ejection seat before the airtow flights began. The project selected the seat used in the T-37 as modified by the Weber Company to use a rocket rather than a ballistic charge for ejection. To test the ejection seat, the Flight Research Center's Dick Klein constructed a plywood mockup of the M2-F1's top deck and canopy. On the first firings, the test was unsuccessful, but on the final test the dummy in the seat landed safely. The M2-F1 ejection seat was later used in the two Lunar Landing Research Vehicles and the three Lunar Landing Training Vehicles. Three of them crashed, but in each case the pilot ejected from the vehicle successfully. The wingless, lifting body aircraft design was initially conceived as a means of landing an aircraft horizontally after atmospheric reentry. The absence of wings would make the extreme heat of re-entry less damaging to the vehicle. In 1962, Dryden management approved a program to build a lightweight, unpowered lifting body as a prototype to flight test the wingless concept. It would look like a 'flying bathtub,' and was designated the M2-F1, the 'M' referring to 'manned' and 'F' referring to 'flight' version. It featured a plywood shell placed over a tubular steel frame crafted at Dryden. Construction was completed in 1963. The first flight tests of the M2-F1 were over Rogers Dry Lake at the end of a tow rope attached to a hopped-up Pontiac convertible driven at speeds up to about 120 mph. This vehicle needed to be able to tow the M2-F1 on the Rogers Dry Lakebed adjacent to NASA's Flight Research Center (FRC) at a minimum speed of 100 miles per hour. To do that, it had to handle the 400-pound pull of the M2-F1. Walter 'Whitey' Whiteside, who was a retired Air Force maintenance officer working in the FRC's Flight Operations Division, was a dirt-bike rider and hot-rodder. Together with Boyden 'Bud' Bearce in the Procurement and Supply Branch of the FRC, Whitey acquired a Pontiac Catalina convertible with

  3. Child car seats – a habitat for house dust mites and reservoir for harmful allergens

    OpenAIRE

    David Clarke; Michael Gormally; Jerome Sheahan; Miriam Byrne

    2015-01-01

    [b]Introduction and objective[/b]. House dust mites produce allergens which can cause or aggravate diseases such as asthma, eczema and rhinitis. The objectives of this study are to quantify typical house dust mite and Der p 1 allergen levels in child car seats, and to determine external variables that may influence mite populations in cars. [b]Materials and Methods[/b]. Dust samples were collected from the child car seats and driver seats of 106 cars using a portable vacuum sampling pump o...

  4. Occupant seating anthropometry: body ellipses and contact zones for side-impact protection research

    Science.gov (United States)

    Culver, Clyde C.; Viano, David C.

    The study has developed an anthropometric description of seated occupants and determined body regions representing major paths in side-impact crashes. The study has identified five major body ellipses defining the head, shoulder, chest, abdomen and pelvis of seated occupants of various sizes, including the six-year-old child. Body contact zones have been determined for front-seated occupants. These templates provide information for the design of side interiors to improve occupant protection in side-impact crashes by load-transfer and energy-absorption characteristics of biocompatible interiors.

  5. Airline seat inventory control benefiting from currency differentials to enhance revenues

    Directory of Open Access Journals (Sweden)

    C.E. Love

    2003-12-01

    Full Text Available The purpose of this paper is to develop an airline seat inventory control model which will capitalise on currency differentials that exist between city pairs. The approach taken here is to maximise Expected Marginal Seat Revenues as proposed by Belobaba for non-nested fare classes. the basic Expected Marginal Seat Revenue model is extended to explicitly include the effects of overbooking. Data from the South African Airways return flight between Cape Town and London is utilised to demonstrate the model.

  6. Optimal protruding node length of bicycle seats determined using cycling postures and subjective ratings.

    Science.gov (United States)

    Chen, Yi-Lang; Liu, Yi-Nan

    2014-07-01

    This study examined body posture, subjective discomfort, and stability, requiring the participants to ride a stationary bicycle for 20 min (cadence: 60 rpm; workrate: 120 W), using various combinations of two handle heights and five seat-protruding node lengths (PNLs). The results indicated that bicycle handle height significantly influenced body posture, and that seat PNL caused differences in the riders' subjective discomfort and stability scores. The various PNLs affected only the trunk angle (approximately 6°), but had significantly positive (r = 0.994, p bicycle seat designs. Copyright © 2014 Elsevier Ltd and The Ergonomics Society. All rights reserved.

  7. Mockup Small-Diameter Air Distribution System

    Energy Technology Data Exchange (ETDEWEB)

    A. Poerschke and A. Rudd

    2016-05-01

    This report investigates the feasibility of using a home-run manifold small-diameter duct system to provide space conditioning air to individual thermal zones in a low-load home. This compact layout allows duct systems to be brought easily within conditioned space via interior partition walls. Centrally locating the air hander unit in the house significantly reduces duct lengths. The plenum box is designed so that each connected duct receives an equal amount of airflow, regardless of the duct position on the box. Furthermore, within a reasonable set of length restrictions, each duct continues to receive similar airflow. The design method uses an additive approach to reach the total needed zonal airflow. Once the cubic feet per minute needed to satisfy the thermal load of a zone has been determined, the total number of duct runs to a zone can be calculated by dividing the required airflow by the standard airflow from each duct. The additive approach greatly simplifies the design effort and reduces the potential for duct design mistakes to be made. Measured results indicate that this plenum design can satisfy the heating load. However, the total airflow falls short of satisfying the cooling load in a hypothetical building. Static pressure inside the plenum box of 51.5 Pa limited the total airflow of the attached mini-split heat pump blower, thus limiting the total thermal capacity. Fan energy consumption is kept to 0.16 to 0.22 watt/CFM by using short duct runs and smooth duct material.

  8. Body diameters in 3 - 6 years old children from Plovdiv

    Directory of Open Access Journals (Sweden)

    Tineshev Slavi

    2013-01-01

    Full Text Available The purpose of the research is to analyze the body diameters in 3-6 year old children. The biacromial diameters were taken as well as the two chest diameters, the bicristal and bitrohanterial diameters in 316 children (157 boys and 159 girls 3, 4, 5 and 6 years of age attending kindergarten in Plovdiv. The analysis shows that all diameters, with the exception of the bitrohanterial have higher values in boys. The absolute year's increment of the diameters is greater in girls. The growth velocity of the researched features is greatest at the age of 3-4 and 4-5, decreasing at different rates for the different features at the age of 5-6. The only exception is the sagittal chest diameter in both sexes and the bitrohanterial diameters in girls.

  9. Pengaruh Variasi Arus Pengelasan dan Variasi Diameter Elektroda Terhadap Kekuatan Tarik Pada Stainless Steel AISI 304

    OpenAIRE

    Manurung, Erwin Makmur

    2016-01-01

    The usage of electric current will affect the outcome of welding result for powering weldingarc. Determination of the welding current for connecting the metal in the welding arc will affect the efficiency of work and welding materials. In this study using austenitic stainless steel AISI 304 Stainless Steel with Welding Shield Metal Arc Welding (SMAW), large of welding current 85 A, 95 A and 105 A, and the type of electrode E 308 L diameter of 2.6 mm, 3.2 mm , and 4.0 mm. The purpose of this s...

  10. Multi-diameter silicon nanowires: Fabrication, characterization, and modeling

    Science.gov (United States)

    Alagoz, Arif Sinan

    Nanotechnology is a rapidly expanding interdisciplinary field offering novel devices for broad range of applications. Quantum effects and surface to volume ratio of nanostructures are strongly size dependent, and redefine material properties at nanoscale. Silicon is one of the most promising materials for next generation nanostructured transistors, photonics devices, Li-ion batteries, photovoltaic solar cells, and thermoelectric energy generators. Since electrical, optical, and mechanical properties of nanostructures strongly depend on their shape, size, periodicity, and crystal structure; it is crucial to control these parameters in order to optimize device performance for targeted applications. This dissertation is intended to develop a low-cost, low-temperature, high-throughput, and large-area nanowire fabrication method that can produce well-ordered arrays of hierarchical single-crystal silicon nanowires at large scale by using nanosphere lithography and metal-assisted chemical etching. Nanowire morphology was characterized by using scanning electron microscope and optical properties of nanowire arrays were modeled with the help of finite-difference-time domain method. These novel multi-diameter silicon nanowire arrays have the potential applications in many fields including but not limited to next generation nanowire solar cells to field ionization gas sensors.

  11. Lumbar Vertebral Canal Diameters in Adult Ugandan Skeletons ...

    African Journals Online (AJOL)

    The midsagittal, transverse diameters of the lumbar vertebral canal and the anteroposterior diameter of the inferior vertebral notch were measured using an electronic digital caliper. Collected data was analyzed using SPSS 12.0 computer program. Results and discussion: In both sexes, the midsagittal diameter of the canal ...

  12. Aortic Root Diameter and Longitudinal Blood Pressure Tracking

    OpenAIRE

    Ingelsson, Erik; Pencina, Michael J.; Levy, Daniel; Aragam, Jayashri; Mitchell, Gary F.; Benjamin, Emelia J.; Vasan, Ramachandran S.

    2008-01-01

    Proximal aortic diameter, including aortic root (AoR) diameter, has been inversely related to pulse pressure (PP) in cross-sectional studies. So, investigators have hypothesized that a smaller AoR diameter may increase risk of developing hypertension. Prospective studies are lacking to test this hypothesis.

  13. Influence of diameter and intraradicular post in the stress distribution. Finite element analysis

    OpenAIRE

    LEMOS, Cleidiel Aparecido Araujo; ALMEIDA, Daniel Augusto de Faria; BATISTA, Victor Eduardo de Souza; MELLO, Carol Cantieri; VERRI, Fellippo Ramos; PELLIZZER, Eduardo Piza; MAZARO, José Vitor Quinelli

    2016-01-01

    Abstract Introduction The biomechanical behavior of endodontically treated teeth depending on the selected restorative material and tooth situation to be restored. Objective To analyze by the two-dimensional finite element method the biomechanical behavior of different diameters in intraradicular posts and teeth with coronal remaining of 2mm. Material and method Six models were made with three types of posts, as follows: Glass fiber post, carbon fiber post, and cast metal post, both with d...

  14. Quasi-Static and Dynamic Sled Testing of Prototype Commuter Rail Passenger Seats

    Science.gov (United States)

    2008-04-22

    In support of the Federal Railroad Administration?s (FRA) Railroad Equipment Safety Program, tests have been conducted on prototype commuter rail passenger seats which have been designed for improved occupant protection during commuter train accident...

  15. 78 FR 49728 - Availability of Seats for National Marine Sanctuary Advisory Councils

    Science.gov (United States)

    2013-08-15

    ... Fishing (alternate); Mobile Gear Commercial Fishing (primary member); Business Industry (alternate); At... DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration Availability of Seats for... Ocean Service (NOS), National Oceanic and Atmospheric Administration (NOAA), Department of Commerce (DOC...

  16. Evaluation of Teen Seat Belt Demonstration Projects in Colorado and Nevada

    Science.gov (United States)

    2011-09-01

    Colorado and Nevada initiated multiwave Teen Seat Belt Demonstration Projects in October 2007. Four : waves of paid media and law enforcement activity were conducted over the next year. Three of these waves : were conducted independently of statewide...

  17. 77 FR 16212 - Availability of Seats for the Channel Islands National Marine Sanctuary Advisory Council

    Science.gov (United States)

    2012-03-20

    ... member and alternate, Tourism member and alternate, Education member and alternate, Chumash member and... particular expertise and experience in relation to the seat for which they are applying; community and...

  18. Expanding the seat belt program strategies toolbox: a starter kit for trying new program ideas.

    Science.gov (United States)

    2016-10-01

    The purpose of this research was to explore alternative strategies for increasing seat belt use. Researchers examined behavior : change strategies proven effective in education, healthcare, advertising, and marketing, and they considered how these : ...

  19. SIT (seated immobility thromboembolism) syndrome: a 21st century lifestyle hazard.

    Science.gov (United States)

    Beasley, Richard; Heuser, Patricia; Raymond, Nigel

    2005-04-01

    The association between prolonged seated immobility and venous thromboembolism (VTE) is well recognised in relation to travel. In this case series, we report the occurrence of deep vein thrombosis (DVT) or pulmonary embolism (PE) following prolonged sitting in relation to work and/or recreation. The cases were characterised by the considerable length of time the individuals sat, the extensive nature of the VTE events in young individuals without other recognised risk factors, and the lack of recognition by the attending doctors of seated immobility as the likely major risk factor. While recognising that the association may be coincidental rather than causal, we propose the acronym 'SIT' (seated immobility thromboembolism) syndrome to encompass all forms of seated immobility associated with VTE.

  20. 77 FR 15359 - Availability of Seats for the Thunder Bay National Marine Sanctuary Advisory Council

    Science.gov (United States)

    2012-03-15

    ... the Thunder Bay National Marine Sanctuary Advisory Council AGENCY: Office of National Marine... the following seats on the Thunder Bay National Marine Sanctuary Advisory Council (council): Education... (including snorkeling), Tourism, Maritime History & Interpretation, and Citizen- at-Large. Applicants are...

  1. Evaluation of the May 2005 Click It or Ticket mobilization to increase seat belt use

    Science.gov (United States)

    2007-05-01

    Click It or Ticket (CIOT) is an intense, short-duration, seat belt publicity and enforcement program. The CIOT May 2005 Mobilization involved approximately $33 million of purchased media. Law enforcement agencies across the Nation reported issuing mo...

  2. 76 FR 291 - Special Conditions: Gulfstream Model GVI Airplane; Single-Occupant Side-Facing Seats

    Science.gov (United States)

    2011-01-04

    ... the lower lumbar spinal column. 3. The load limit in the torso in the lateral direction. Human... seats the injury criteria are currently limited to head, spine, and femur loads. The head and lumbar...

  3. 75 FR 42379 - Availability of Seats for the Monterey Bay National Marine Sanctuary Advisory Council

    Science.gov (United States)

    2010-07-21

    ... the seat for which they are applying; community and professional affiliations; philosophy regarding... the State and Federal management agencies, user groups, researchers, educators, policy makers, and... and is instrumental in helping develop policies, program goals, and identify education, outreach...

  4. 78 FR 14271 - Availability of Seats for the Monterey Bay National Marine Sanctuary Advisory Council

    Science.gov (United States)

    2013-03-05

    ... the seat for which they are applying; community and professional affiliations; philosophy regarding... federal management agencies, user groups, researchers, educators, policy makers, and other various groups... helping develop policies, program goals, and identify education, outreach, research, long-term monitoring...

  5. Seat belt, DWI, and other traffic violations among recent immigrants in Florida and Tennessee.

    Science.gov (United States)

    2013-05-01

    Phase I of this project identified two States, Florida and Tennessee, that maintain information on drivers traffic violations and residency status. : Phase II analyzed State databases to examine seat belt nonuse, DWI, and other traffic safety viol...

  6. Effect of the "Long Term Solution" Seat Pack on Harvard II (CT156) Aircrew Accommodation

    National Research Council Canada - National Science Library

    Murphy, Pierre

    2003-01-01

    ...). A previous study determined that any increase in seat thickness would likely have repercussions on the ability of the taller individuals to see all of the information displayed by the Electronic...

  7. 78 FR 73506 - Submission for OMB Review; Comment Request: Infant Bath Seats

    Science.gov (United States)

    2013-12-06

    ... provisions of the Paperwork Reduction Act of 1995 (44 U.S.C. Chapter 35) to announce the CPSC's intention to... instructions with infant bath seats thus would be ``usual and customary'' and not within the definition of...

  8. Comparison of interior crashworthiness observed in passenger train accidents and 8G dynamic seat sled tests

    Science.gov (United States)

    2012-04-17

    The Office of Research and Development of the Federal Railroad Administration conducts engineering research to address protection of passengers and crew during train accidents. This research includes accident investigations and dynamic seat testing t...

  9. Design Method for Fast Switching Seat Valves for Digital Displacement Machines

    DEFF Research Database (Denmark)

    Roemer, Daniel Beck; Johansen, Per; Pedersen, Henrik C.

    2014-01-01

    corresponding to the piston movement, which has been shown to facilitate superior part load efficiency combined with high bandwidth compared to traditional displacement machines. However, DD machines need fast switching on-off valves with low pressure loss for efficient operation, especially in fast rotating......Digital Displacement (DD) machines are upcoming technology where the displacement of each pressure chamber is controlled electronically by use of two fast switching seat valves. The effective displacement and operation type (pumping/motoring) may be controlled by manipulating the seat valves...... method for DD seat valves are presented, taking into account the significant aspects related to obtaining efficient DD valves with basis in a given DD machine specifications. The seat area is minimized and the stroke length is minimized to obtain fast switching times while considering the pressure loss...

  10. EVALUATING EXTREMELY LOW FREQUENCY MAGNETIC FIELDS IN THE REAR SEATS OF THE ELECTRIC VEHICLES.

    Science.gov (United States)

    Lin, Jun; Lu, Meng; Wu, Tong; Yang, Lei; Wu, Tongning

    2018-03-23

    In the electric vehicles (EVs), children can sit on a safety seat installed in the rear seats. Owing to their smaller physical dimensions, their heads, generally, are closer to the underfloor electrical systems where the magnetic field (MF) exposure is the greatest. In this study, the magnetic flux density (B) was measured in the rear seats of 10 different EVs, for different driving sessions. We used the measurement results from different heights corresponding to the locations of the heads of an adult and an infant to calculate the induced electric field (E-field) strength using anatomical human models. The results revealed that measured B fields in the rear seats were far below the reference levels by the International Commission on Non-Ionizing Radiation Protection. Although small children may be exposed to higher MF strength, induced E-field strengths were much lower than that of adults due to their particular physical dimensions.

  11. Effect of tree roots on shallow-seated landslides

    Science.gov (United States)

    Kazutoki Abe Abe; Robert R. Ziemer

    1991-01-01

    Forest vegetation, especially tree roots, helps stabilize hillslopes by reinforcing soil shear strength. To evaluate the effect of tree roots on slope stability, information about the amount of roots and their strength should be known. A simulation model for the root distribution of Cryptomeria japonica was proposed where the number of roots in each 0.5-cm diameter...

  12. Refueling system with small diameter rotatable plugs

    International Nuclear Information System (INIS)

    Ritz, W.C.

    1987-01-01

    This patent describes a liquid-metal fastbreeder nuclear reactor comprising a reactor pressure vessel and closure head therefor, a reactor core barrel disposed within the reactor vessel and enclosing a reactor core having therein a large number of closely spaced fuel assemblies, and the reactor core barrel and the reactor core having an approximately concentric circular cross-sectional configuration with a geometric center in predetermined location within the reactor vessel. The improved refueling system described here comprises: a large controllably rotatable plug means comprising the substantial portion of the closure head, a reactor upper internals structure mounted from the large rotatable plug means. The large rotatable plug means has an approximately circular configuration which approximates the cross-sectional configuration of the reactor core barrel with a center of rotation positioned a first predetermined distance from the geometric center of the reactor core barrel so that the large rotatable plug means rotates eccentrically with respect to the reactor core barrel; a small controllably rotatable plug means affixed to the large rotatable plug means and rotatable with respect thereto. The small rotatable plug means has a center of rotation which is offset a second predetermined distance from the rotational center of the large rotatable plug means so that the small rotatable plug means rotates eccentrically with respect to the large rotatable plug means

  13. Thermometry system development for thermoradiotherapy of deep-seated tumours

    Science.gov (United States)

    Fadeev, A. M.; Ivanov, S. M.; Perelstein, E. A.; Polozov, S. M.

    2017-12-01

    Therapeutic hyperthermia (including RF hyperthermia) in combination with radiotherapy (called thermoradiotherapy) is one of widely used contemporary cancer treatment methods. The independent electron linac and RF system or their combinations are necessary for effective therapy. Whole-body hyperthermia is used for treatment of metastatic cancer that was spread throughout the body, regional one is used for treatment of part of the body (for instance leg or abdominal cavity). Local hyperthermia with characteristic size of heating volume of 20-100 mm permits to heat tumour without overheating of healthy tissues. The thermometry of deep suited tissues during the hyperthermia process is an important and complex task. Invasive methods as thermistors, optical sensors or thermo-couples can not be widely used because all of them are able to transport tumor cells to the healthy region of the patient body. Distant methods of the temperature measurement such, as radiothermometry and acoustic thermometry can not be used for tissues seated deeper than 5-7 cm. One of possible ways to solve the problem of temperature measurement of the deep suited tissues is discussed in this article: it was proposed to use the same electrodes for RF hyperthermia and thermometry. As known electrodynamics characteristics of tissues are sufficiently depends on temperature. It was proposed to use this effect for active radiothermometry in local hyperthermia. Two opposite RF dipoles can be used as generator and receiver of pick-up signal.

  14. The effect of a dynamic chair on seated energy expenditure.

    Science.gov (United States)

    Synnott, Aoife; Dankaerts, Wim; Seghers, Jan; Purtill, Helen; O'Sullivan, Kieran

    2017-10-01

    Dynamic sitting approaches have been advocated to increase seated energy expenditure with the view of lessening the sedentary nature of the task. This study compared energy expenditure (EE) and overall body discomfort on a novel dynamic chair with a standard office chair. Fifteen pain-free participants completed a DVD viewing task on both chairs in a randomised order. Energy expenditure and discomfort were collected simultaneously. Linear mixed models were used to analyse steady-state EE recorded on each of the chairs. Differences in discomfort were analysed using Wilkoxon Signed Rank Tests. Sitting on the novel dynamic chair significantly (p = 0.005) increased energy expenditure compared to a standard office chair. The discomfort experienced was mild overall, but was significantly greater on the dynamic chair (p = 0.004). Whilst the EE was seen to be significantly higher on the dynamic chair, the MET values are still below 1.5 METS. Thus, the use of a dynamic chair does not seem to be the most effective measure to prevent sedentary behaviour. Practitioner Summary: Sitting on a dynamic chair increased energy expenditure compared to sitting on a standard office chair among pain-free participants. Whilst the EE was seen to be significantly higher on the dynamic chair, the MET values are still below 1.5 METS (low level EE).

  15. Optimizing the rear seat environment for older children, adults, and infants.

    Science.gov (United States)

    Hu, Jingwen; Wu, Jun; Klinich, Kathleen D; Reed, Matthew P; Rupp, Jonathan D; Cao, Libo

    2013-01-01

    Our recent rear seat safety research found that more-forward and higher lap belt anchorage locations and much shorter and stiffer seat cushions can improve the protection of older children from 6 to 12 years old who are using the vehicle belt without a booster. The objective of this study was to investigate whether the optimal rear seat restraint systems for adults and infants are consistent with those for older children. We conducted sensitivity analyses and design optimizations for adults and for infants in a rear-facing child restraint system (CRS) using a set of MADYMO models, an automated simulation framework, and occupant belt-fit and posture prediction models from our previous studies. A series of 12 sled tests was also used to validate the computational models. The optimal belt anchorage locations and the seat cushion length for older children, adults, and rear-facing CRS-seated infants conflict with each other. In particular, more-forward lap belt anchorage locations that prevent submarining for older children would reduce the protection to both adults and CRS-seated infants, although the protection is still acceptable based on regulated injury criteria. A shorter seat cushion could provide optimal protection to older children and adults but would significantly increase the CRS rotation. The findings of this study suggested that adaptive/adjustable restraint systems are necessary to simultaneously improve the rear seat occupant protection for all age groups. Supplemental materials are available for this article. Go to the publisher's online edition of Traffic Injury Prevention to view the supplemental file.

  16. Tilted seat position for non-ambulant individuals with neurological and neuromuscular impairment: a systematic review

    OpenAIRE

    Michael, SM; Porter, D; Pountney, TE

    2008-01-01

    Objective: To determine the effects of tilt-in-space seating on outcomes for people with neurological or neuromuscular impairment who cannot walk. Data sources: Search through electronic databases (MEDLINE, Embase, CINAHL, AMED). Discussions with researchers who are active in field. Review methods: Selection criteria included interventional studies that investigated the effects of seat tilt on outcome or observational studies that identified outcomes for those who had used tilt-in-space seati...

  17. Effect of Implant Connection Type and Depth on the Seating Accuracy of Hand-Tightened Abutments.

    Science.gov (United States)

    Siadat, Hakimeh; Belbasi, Simin; Alikhasi, Marzieh; Nazari, Vahideh; Beyabanaki, Elaheh

    2017-12-14

    Improper seating of abutment on the implant is a common problem. This study investigated the effect of the type of implant/abutment interface on the complete seating of the abutments on the head of implants placed at different gingival depths. Three implant systems with three different connections including straight external hexagon, butt-joint internal tri-lobed, and conical internal hexagon were used. Two gingival thicknesses (2 and 7 mm) were created using pink baseplate wax around the straight abutments seated on the implants. After placing the implants in acrylic blocks, the wax was replaced with the gingival mask material to simulate the gingival drape around the implant heads. Afterwards, 15 prosthodontists were asked to hand-tighten the straight abutments in the corresponding implant bodies relying only on their tactile sense. At the final stage, the gingival mask was removed, and the seating quality of the abutments on implant bodies was assessed visually. The effect of implant connection and depth on abutment seating accuracy was analyzed using Kruskal-Wallis and multiple-comparison tests. No significant difference was found regarding the effect of either depth or connection design on the accuracy of the abutment seating (p > 0.05); however, pairwise comparison of the combined effect of the depth and connection design was significant (p = 0.009). Accuracy of abutment seating on the Nobel Active implants at both 2 and 7 mm depths were significantly better than Replace system with 7 mm depth (p = 0.027). The same results were obtained in comparison between Nobel Active system at both 2 and 7 mm depths with Branemark system with 7 mm depth (p = 0.006). An increase in implant placement depth meant a decrease in accuracy of the abutment seating. The internal conical connection design showed the best result in abutment positioning in deep implants as compared with external and internal butt-joint connection designs. © 2017 by the American College of

  18. Douglas Aircraft Company Advanced Concept Ejection Seat (ACES II). Revision C

    Science.gov (United States)

    1983-01-01

    single place aircraft, ) OGM "PLOYS "A 01, 0t7 0.7 the inertia reel may be initiated by the seat-mounted initiator. Q SoAAc ,INTs o., o., 0, ole Pressure...the switch is selected to -46-DEC PITCH. I160-DEC ROLLI 250 G00 467 "automatic," transmission will commence following seat-man ’FOR THIS CASE, IMPACT

  19. Are toilet seats a vector for transmission of methicillin-resistant Staphylococcus aureus?

    Science.gov (United States)

    Giannini, Mary Anne; Nance, Donna; McCullers, Jonathan A

    2010-01-01

    We studied the bacterial burden on toilet seats in a children's cancer hospital to validate a policy requesting that immunocompromised children use alcohol wipes on the seats prior to use of the toilets. Methicillin resistant Staphylococcus aureus (MRSA) was recovered from 3.3% of hospital toilets when wipes were not in use. Use of wipes resulted in a 50-fold reduction in mean daily bacterial counts and eliminated MRSA. PMID:19243856

  20. Virus templated metallic nanoparticles

    Science.gov (United States)

    Aljabali, Alaa A. A.; Barclay, J. Elaine; Lomonossoff, George P.; Evans, David J.

    2010-12-01

    Plant viruses are considered as nanobuilding blocks that can be used as synthons or templates for novel materials. Cowpea mosaic virus (CPMV) particles have been shown to template the fabrication of metallic nanoparticles by an electroless deposition metallization process. Palladium ions were electrostatically bound to the virus capsid and, when reduced, acted as nucleation sites for the subsequent metal deposition from solution. The method, although simple, produced highly monodisperse metallic nanoparticles with a diameter of ca. used as synthons or templates for novel materials. Cowpea mosaic virus (CPMV) particles have been shown to template the fabrication of metallic nanoparticles by an electroless deposition metallization process. Palladium ions were electrostatically bound to the virus capsid and, when reduced, acted as nucleation sites for the subsequent metal deposition from solution. The method, although simple, produced highly monodisperse metallic nanoparticles with a diameter of ca. agarose gel electrophoresis results, energy dispersive X-ray spectra, ζ-potential measurements, dynamic light scattering data, nanoparticle tracking analysis and an atomic force microscopy image of Ni-CPMV. See DOI: 10.1039/c0nr00525h

  1. Using naturalistic driving data to identify variables associated with infrequent, occasional, and consistent seat belt use.

    Science.gov (United States)

    Reagan, Ian J; McClafferty, Julie A; Berlin, Sharon P; Hankey, Jonathan M

    2013-01-01

    Seat belt use is one of the most effective countermeasures to reduce traffic fatalities and injuries. The success of efforts to increase use is measured by road side observations and self-report questionnaires. These methods have shortcomings, with the former requiring a binary point estimate and the latter being subjective. The 100-car naturalistic driving study presented a unique opportunity to study seat belt use in that seat belt status was known for every trip each driver made during a 12-month period. Drivers were grouped into infrequent, occasional, or consistent seat belt users based on the frequency of belt use. Analyses were then completed to assess if these groups differed on several measures including personality, demographics, self-reported driving style variables as well as measures from the 100-car study instrumentation suite (average trip speed, trips per day). In addition, detailed analyses of the occasional belt user group were completed to identify factors that were predictive of occasional belt users wearing their belts. The analyses indicated that consistent seat belt users took fewer trips per day, and that increased average trip speed was associated with increased belt use among occasional belt users. The results of this project may help focus messaging efforts to convert occasional and inconsistent seat belt users to consistent users. Copyright © 2012 Elsevier Ltd. All rights reserved.

  2. Sitting on a Sloping Seat Does Not Reduce the Strain Sustained by the Postural Chain

    Science.gov (United States)

    Hamaoui, Alain; Hassaïne, Myriam; Zanone, Pier-Giorgio

    2015-01-01

    The objective of this study was to explore the effect of a forward sloping seat on posture and muscular activity of the trunk and lower limbs. To this aim, twelve asymptomatic participants were tested in six conditions varying seat slope (0°, 15° forward) and height (high, medium, low). Angular position of head, trunk and pelvis was assessed with an inertial orientation system, and muscular activity of 11 superficial postural muscles located in the trunk and lower limbs was estimated using normalized EMG. Results showed that a forward sloping seat, compared to a flat seat, induced a greater activity of the soleus (p<0.01), vastus lateralis (p<0.05) and vastus medialis (p<0.05), as well a lower hip flexion (p<0.01). In contrast, no significant variation of head, trunk and pelvis angular position was observed according to seat slope. It was concluded that forward sloping seats increase the load sustained by the lower limbs, without a systematic improvement of body posture. PMID:25587989

  3. Evaluation of the seat fastening in the frame of a road bus submitted to frontal impact

    Directory of Open Access Journals (Sweden)

    Márcio Walber

    Full Text Available The collective intercity transportation by bus is currently a mean of locomotion much sought after by people. Security in accidents is a very important factor that must be taken into account in design of bus body structure, being the evaluation of passenger safety of this type of vehicle is an important subject that should be checked, because in many accidents occur disconnection between seats and fastening members causing serious passengers injury, often fatal. This work aims at evaluation the behavior of frame fixing of seats of intercity bus bodies, submitted to the frontal impact situation in a rigid wall of 100% offset, through evaluation by finite element method (FEM. This study uses a numerical model corresponding to the body structure and chassis, developed through flexible beam elements, combining with shell elements for the structure of the seats and its fastening members, with the objective of not missing the essential aspects of the problem, allowing the solution with a reduced computational time. The numerical model of bus body and seat was impacted against a rigid wall at a speed of 8.89 m/s, being its validation according to the deceleration curve established by Regulation 80. Then it was gotten the Von Mises stress in fastening members of the seat structure in bus body. It is also presented a proposal to improve the fastening of the seat structure, comparing the results of the stress gotten in the two types fastening submitted to the frontal impact.

  4. "Hot Seat" Questioning: A Technique to Promote and Evaluate Student Dialogue

    Science.gov (United States)

    Crider, Anthony

    Several approaches have been proposed to include students in classroom dialogue, including "think-pair-share" and "talk to your neighbor." I recently implemented an additional technique in which four students answer questions in a "Hot Seat" at the front of the classroom. An unforeseen by-product of this was student-initiated peer instruction outside of the classroom. A small case study (approximately 50 students) on the effect of the Hot Seat using the midterm exam showed that students were 9.5 +/- 3.2% more likely to correctly answer a question related to material covered while they occupied the Hot Seat. Analysis of the Astronomy Diagnostic Test revealed that they were twice as likely to learn their Hot Seat material. A survey revealed one likely reason: Students typically spent 15-60 additional minutes preparing for class on their two assigned Hot Seat dates. Curiously, students received no significant benefit (2.2 +/- 3.6%) from their second turn in the Hot Seat, possibly reflecting student immunization to its motivational pressure.

  5. The Influence of Tractor-Seat Height above the Ground on Lateral Vibrations

    Directory of Open Access Journals (Sweden)

    Jaime Gomez-Gil

    2014-10-01

    Full Text Available Farmers experience whole-body vibrations when they drive tractors. Among the various factors that influence the vibrations to which the driver is exposed are terrain roughness, tractor speed, tire type and pressure, rear axle width, and tractor seat height above the ground. In this paper the influence of tractor seat height above the ground on the lateral vibrations to which the tractor driver is exposed is studied by means of a geometrical and an experimental analysis. Both analyses show that: (i lateral vibrations experienced by a tractor driver increase linearly with tractor-seat height above the ground; (ii lateral vibrations to which the tractor driver is exposed can equal or exceed vertical vibrations; (iii in medium-size tractors, a feasible 30 cm reduction in the height of the tractor seat, which represents only 15% of its current height, will reduce the lateral vibrations by around 20%; and (iv vertical vibrations are scarcely influenced by tractor-seat height above the ground. The results suggest that manufacturers could increase the comfort of tractors by lowering tractor-seat height above the ground, which will reduce lateral vibrations.

  6. Comparison of respiratory physiologic features when infants are placed in car safety seats or car beds.

    Science.gov (United States)

    Kinane, T Bernard; Murphy, Joan; Bass, Joel L; Corwin, Michael J

    2006-08-01

    The objective of this study was to compare the respiratory physiologic features of healthy term infants placed in either a car bed or a car safety seat. Within the first 1 week of life, 67 healthy term infants were recruited and assigned randomly to be monitored in either a car bed (33 infants) or a car safety seat (34 infants). Physiologic data, including oxygen saturation and frequency and type of apnea, were obtained and analyzed in a blinded manner. The groups spent similar amounts of time in the devices (car bed: 71.6 minutes; car seat: 74.2 minutes). The mean oxygen saturation values were not different between the groups (car bed: 97.1%; car seat: 97.3%). The percentages of time with oxygen saturation of car bed: 11.8[corrected]%; car seat: 18.3[corrected]%). In both groups, a number of infants spent high percentages of study time with oxygen saturation of car safety seat group (54%-63% of study time). Values for the 6 infants in the car bed group with the most time at this level were lower (20%-42%). This difference in the duration of oxygen saturation of features of infants in the 2 car safety devices were observed to be similar. Of note, substantial periods of time with oxygen saturation of < 95% were surprisingly common in both groups.

  7. A Case Study: Designing for Sustainability and Reliability in an Automotive Seat Structure

    Directory of Open Access Journals (Sweden)

    Celalettin Yuce

    2014-07-01

    Full Text Available Recently, sustainability has been a growing concern for many industries and especially for the transportation sector due to it being the second largest energy consumer and largest contributor of anthropogenic greenhouse gas emissions within the European Union. New legal restrictions on the emission rates have forced the automotive sector to examine different fuel-efficient technologies. Vehicle weight reduction is one of the most important methods of improving fuel efficiency and reducing CO2 emissions. Accordingly, lighter, safer, more fuel efficient, and environmentally sustainable vehicles are a priority for European authorities. In the present work, the passenger seat structure was considered as the area for lightweighting due to its important role in the mass of commercial vehicles in terms of numbers per vehicle. In addition, seat structures presented the best opportunity for weight reduction using new materials and design techniques. Detailed (3D finite element models of passenger seats were developed for finite element analyses (FEA. To obtain a lightweight and safe seat structure, different materials and thicknesses of profiles were analyzed. Lightweight passenger seat prototypes were developed and an overall 20% weight reduction was achieved including the structural frame, chassis and pillar. In addition, the new passenger seat meets ECE R14 safety norms.

  8. Modeling light scattering in the shadow region behind thin cylinders for diameter analysis

    Science.gov (United States)

    Blohm, Werner

    2018-03-01

    In this paper, the scattered light intensities resulting in the shadow region at an observation plane behind monochromatically illuminated circular cylinders are modeled by sinusoidal sequences having a squared dependence on spatial position in the observation plane. Whereas two sinusoidal components appear to be sufficient for modeling the light distribution behind intransparent cylinders, at least three sinusoidal components are necessary for transparent cylinders. Based on this model, a novel evaluation algorithm for a very fast retrieval of the diameter of thin cylindrical products like metallic wires and transparent fibers is presented. This algorithm was tested in a cylinder diameter range typical for these products (d ≈ 70 … 150 μm; n ≈ 1.5). Numerical examples are given to illustrate its application by using both synthetic and experimental scattering data. Diameter accuracies below 0.05 μm could be achieved for intransparent cylinders in the tested diameter range. However, scattering effects due to morphological-dependent resonances (MDRs) are problematical in the diameter analysis of transparent products. In order to incorporate these effects into the model, further investigations are needed.

  9. Effect of Catalytic Layer Thickness on Diameter of Vertically Aligned Individual Carbon Nanotubes

    Directory of Open Access Journals (Sweden)

    Hyun Kyung Jung

    2014-01-01

    Full Text Available The effect of catalytic thin film thickness on the diameter control of individual carbon nanotubes grown by plasma enhanced chemical vapor deposition was investigated. Individual carbon nanotubes were grown on catalytic nanodot arrays, which were fabricated by e-beam lithography and e-beam evaporation. During e-beam evaporation of the nanodot pattern, more catalytic metal was deposited at the edge of the nanodots than the desired catalyst thickness. Because of this phenomenon, carbon atoms diffused faster near the center of the dots than at the edge of the dots. The carbon atoms, which were gathered at the interface between the catalytic nanodot and the diffusion barrier, accumulated near the center of the dot and lifted the catalyst off. From the experiments, an individual carbon nanotube with the same diameter as that of the catalytic nanodot was obtained from a 5 nm thick catalytic nanodot; however, an individual carbon nanotube with a smaller diameter (~40% reduction was obtained from a 50 nm thick nanodot. We found that the thicker the catalytic layer, the greater the reduction in diameter of the carbon nanotubes. The diameter-controlled carbon nanotubes could have applications in bio- and nanomaterial scanning and as a contrast medium for magnetic resonance imaging.

  10. Fighting Corruption: A Cross-National Study on the Effect of Reserved Legislative Seats for Ethnic Groups on Corruption

    OpenAIRE

    Stendahl, Ludvig

    2016-01-01

    The aim of this paper is to examine the relationship between reserved seats for ethnic groups in national legislatures and corruption. In 2008, over 30 countries were reserving seats for ethnic groups in their national legislature. The share of seats that was reserved ranged from a 2 percent reserved seats arrangement for a small ethnic minority, to a 100 percent reserved seats power-sharing arrangement between two or more ethnic groups. By applying theories of informal power, this essay hypo...

  11. The quantitative evaluation of intracranial pressure by optic nerve sheath diameter/eye diameter CT measurement.

    Science.gov (United States)

    Bekerman, Inessa; Sigal, Tal; Kimiagar, Itzhak; Ben Ely, Anna; Vaiman, Michael

    2016-12-01

    The changes of the optic nerve sheath diameter (ONSD) have been used to assess changes of the intracranial pressure for 20 years. The aim of this research was to further quantify the technique of measuring the ONSD for this purpose. Retrospective study of computed tomographic (CT) data of 1766 adult patients with intracranial hypotension (n=134) or hypertension (n=1632) were analyzed. The eyeball transverse diameter (ETD) and ONSD were obtained bilaterally, and the ONSD/ETD ratio was calculated. The ratio was used to calculate the normal ONSD for patients and to estimate the intracranial pressure of the patients before and after the onset of the pathology. Correlation analysis was performed with invasively measured intracranial pressure, the presence or absence of papilledema, sex, and age. In hypotension cases, the ONSD by CT was 3.4±0.7 mm (P=.03 against normative 4.4±0.8 mm). In cases with hypertension, the diameter was 6.9±1.3 (P=.02, with a cutoff value ˃5.5 mm). The ONSD/ETD ratio was 0.29±0.04 against 0.19±0.02 in healthy adults (P=.01). The ONSD and the ONSD/ETD ratio can indicate low intracranial pressure, but quantification is impossible at intracranial pressure less than 13 mm Hg. In elevated intracranial pressure, the ONSD and the ratio provide readings that correspond to readings in millimeters of mercury. The ONSD method, reinforced with additional calculations, may help to indicate a raised intracranial pressure, evaluate its severity quantitatively, and establish quantitative goals for treatment of intracranial hypertension, but the limitations of the method are to be taken into account. Copyright © 2016 Elsevier Inc. All rights reserved.

  12. Modeling school bus seat belt usage: Nested and mixed logit approaches.

    Science.gov (United States)

    Mehta, Gaurav; Lou, Yingyan

    2013-03-01

    School bus seat belt usage has been of great interest to the school transportation community. Understanding factors that influence students' decisions about wearing seat belts or not is important in determining the most cost-effective ways to improve belt usage rate, and thus the seat belt safety benefits. This paper presents a rigorous empirical analysis on data from Alabama School Bus Pilot Project using discrete choice modeling framework. In order to collect relevant information on individual student-trips, a new data collection protocol is adopted. Three choice alternatives are considered in the study: wearing, not wearing, and improperly wearing seat belts. A student's choice probabilities of these alternatives are modeled as functions of the student's characteristics and trip attributes. The coefficients of the variables in the functions are estimated first using standard multinomial logit model. Moreover, to account for potential correlations among the three choice alternatives and individual-level preference and response heterogeneity among users, nested and mixed logit models are employed in the investigation. Eight significant influence factors are identified by the final models. Their relative impacts are also quantified. The factors include age, gender and the home county of a student, a student's trip length, time of day, seat location, presence and active involvement of bus aide, and two levels of bus driver involvement. The impact of the seat location on students' seat belt usage is revealed for the first time by this study. Both hypotheses that some of the choice alternatives are correlated and that individual-level heterogeneity exists are tested statistically significant. In view of this, the nested and the mixed logit model are recommended over the standard multinomial logit model to describe and predict students' seat belt usage behaviors. The final nested logit model uncovers a correlation between improper wearing and not wearing, indicating

  13. Analysis of Gear Wheel-shaft Joint Characterized by Comparable Pitch Diameter and Mounting Diameter

    Directory of Open Access Journals (Sweden)

    J. Ryś

    2003-01-01

    Full Text Available This paper presents the design procedure for a gear wheel-shaft direct frictional joint. The small difference between the operating pitch diameter of the gear and the mounting diameter of the frictional joint is the key feature of the connection. The contact surface of the frictional joint must be placed outside the bottom land of the gear, and the geometry of the joint is limited to the specific type of solutions.The strength analysis is based on the relation between the torque and statistical load intensity of the gear transmission. Several dimensionless parameters are introduced to simplify the calculations. Stress-strain verifying analysis with respect to combined loading, the condition of appropriate load-carrying capacity of the frictional joint and the fatigue strength of the shaft are applied to obtain the relations between the dimensions of the joint and other parameters. The final engineering solution may then be suggested. The approach is illustrated by a numerical example.The proposed procedure can be useful in design projects for small, high-powered modern reducers and new-generation geared motors, in particular when manufactured in various series of types.

  14. Newborn Parent Based Intervention to Increase Child Safety Seat Use

    Science.gov (United States)

    Liu, Xiangxiang; Yang, Jingzhen; Cheng, Fuyuan; Li, Liping

    2016-01-01

    This paper intends to assess the effect of a maternity department intervention on improvement of knowledge and use of child safety seats (CSS) among newborn parents. An intervention study included three groups (one education plus free CSS intervention group, one education only group, and one control group). The participants were parents of newborns in the maternity department of two hospitals. Both of the intervention groups received a folded pamphlet of child passenger safety, a height chart and standardized safety education during their hospital stay after giving birth. The education plus free CSS intervention group received an additional free CSS and professional installation training at hospital discharge. The control group received a pamphlet with educational information about nutrition and food safety. Three months after enrollment, a telephone follow-up was conducted among participants in the three groups. Data on child passenger safety knowledge, risky driving behaviors, and use of CSS were evaluated before and after the intervention. A total of 132 newborn parents were enrolled in the study; of those, 52 (39.4%) were assigned into the education plus free CSS intervention group, 44 (33.3%) were in the education intervention only group, and 36 (27.3%) were in the control group. No significant differences existed in demographics among the three groups. There was a significant difference in newborn parents’ child passenger safety knowledge and behaviors in the three groups before and after the intervention. In addition, the CSS use increased significantly in the education plus free CSS group after the intervention compared to parents in the education only or control groups. Education on safety, combined with a free CSS and professional installation training, were effective at increasing newborn parents’ knowledge and use of CSS. Future studies with larger sample sizes and longer follow-up are needed to determine a long-term effect of the intervention. PMID

  15. Newborn Parent Based Intervention to Increase Child Safety Seat Use

    Directory of Open Access Journals (Sweden)

    Xiangxiang Liu

    2016-08-01

    Full Text Available This paper intends to assess the effect of a maternity department intervention on improvement of knowledge and use of child safety seats (CSS among newborn parents. An intervention study included three groups (one education plus free CSS intervention group, one education only group, and one control group. The participants were parents of newborns in the maternity department of two hospitals. Both of the intervention groups received a folded pamphlet of child passenger safety, a height chart and standardized safety education during their hospital stay after giving birth. The education plus free CSS intervention group received an additional free CSS and professional installation training at hospital discharge. The control group received a pamphlet with educational information about nutrition and food safety. Three months after enrollment, a telephone follow-up was conducted among participants in the three groups. Data on child passenger safety knowledge, risky driving behaviors, and use of CSS were evaluated before and after the intervention. A total of 132 newborn parents were enrolled in the study; of those, 52 (39.4% were assigned into the education plus free CSS intervention group, 44 (33.3% were in the education intervention only group, and 36 (27.3% were in the control group. No significant differences existed in demographics among the three groups. There was a significant difference in newborn parents’ child passenger safety knowledge and behaviors in the three groups before and after the intervention. In addition, the CSS use increased significantly in the education plus free CSS group after the intervention compared to parents in the education only or control groups. Education on safety, combined with a free CSS and professional installation training, were effective at increasing newborn parents’ knowledge and use of CSS. Future studies with larger sample sizes and longer follow-up are needed to determine a long-term effect of the

  16. Detecting destabilizing wheelchair conditions for maintaining seated posture.

    Science.gov (United States)

    Crawford, Anna; Armstrong, Kiley; Loparo, Kenneth; Audu, Musa; Triolo, Ronald

    2018-02-01

    The purpose of this study was to detect and classify potentially destabilizing conditions encountered by manual wheelchair users with spinal cord injuries (SCI) to dynamically increase stability and prevent falls. A volunteer with motor complete T11 paraplegia repeatedly propelled his manual wheelchair over level ground and simulated destabilizing conditions including sudden stops, bumps and rough terrain. Wireless inertial measurement units attached to the wheelchair frame and his sternum recorded associated accelerations and angular velocities. Algorithms based on mean, standard deviation and minimum Mahalanobis distance between conditions were constructed and applied to the data off-line to discriminate between events. Classification accuracy was computed to assess effects of sensor position and potential for automatically selecting a dynamic intervention to best stabilize the wheelchair user. The decision algorithm based on acceleration signals successfully differentiated destabilizing conditions and level over-ground propulsion with classification accuracies of 95.8, 58.3 and 91.7% for the chest, wheelchair and both sensors, respectively. Mahalanobis distance classification based on trunk accelerations is a feasible method for detecting destabilizing events encountered by wheelchair users and may serve as an effective trigger for protective interventions. Incorporating data from wheelchair-mounted sensors decreases the false negative rate. Implications for Rehabilitation SCI has a significant impact on quality of life, compromising the ability to participate in social or leisure activities, and complete other activities of daily living for an independent lifestyle. Using inertial measurement units to build an event classifier for control the actions of a neuroprosthetic device for maintaining seated posture in wheelchair users. Varying muscle activation increases user stability reducing the risk of injury.

  17. Impact of Active Climate Control Seats on Energy Use, Fuel Use, and CO2 Emissions

    Energy Technology Data Exchange (ETDEWEB)

    Kreutzer, Cory J [National Renewable Energy Laboratory (NREL), Golden, CO (United States); Rugh, John P [National Renewable Energy Laboratory (NREL), Golden, CO (United States); Titov, Eugene V [National Renewable Energy Laboratory (NREL), Golden, CO (United States); Kekelia, Bidzina [National Renewable Energy Laboratory (NREL), Golden, CO (United States)

    2017-11-28

    A project was developed through collaboration between Gentherm and NREL to determine the impact of climate control seats for light-duty vehicles in the United States. The project used a combination of experimentation and analysis, with experimental results providing critical input to the analysis process. First, outdoor stationary vehicle testing was performed at NREL's facility in Golden, CO using multiple occupants. Two pre-production Ford Focus electric vehicles were used for testing; one containing a standard inactive seat and the second vehicle containing a Gentherm climate control seat. Multiple maximum cool-down and steady-state cooling tests were performed in late summer conditions. The two vehicles were used to determine the increase in cabin temperature when using the climate control seat in comparison to the baseline vehicle cabin temperature with a standard seat at the equivalent occupant whole-body sensation. The experiments estimated that on average, the climate control seats allowed for a 2.61 degrees Celsius increase in vehicle cabin temperature at equivalent occupant body sensation compared to the baseline vehicle. The increased cabin air temperature along with their measured energy usage were then used as inputs to the national analysis process. The national analysis process was constructed from full vehicle cabin, HVAC, and propulsion models previously developed by NREL. In addition, three representative vehicle platforms, vehicle usage patterns, and vehicle registration weighted environmental data were integrated into the analysis process. Both the baseline vehicle and the vehicle with climate control seats were simulated, using the experimentally determined cabin temperature offset of 2.61degrees Celsius and added seat energy as inputs to the climate control seat vehicle model. The U.S. composite annual fuel use savings for the climate control seats over the baseline A/C system was determined to be 5.1 gallons of gasoline per year per

  18. Effect of a suspension seat support chair on the trunk flexion angle and gluteal pressure during computer work.

    Science.gov (United States)

    Yoo, Won-Gyu

    2015-09-01

    [Purpose] We assessed the effects of a suspension seat support chair on the trunk flexion angle and gluteal pressure during computer work. [Subjects] Ten males were recruited. [Methods] The suspension seat support was developed to prevent abnormal gluteal pressure and a slumped sitting posture during computer work. The gluteal pressure was measured with a TekScan system and the trunk flexion angle was measured with a video camera, to compare the differences between a general chair and the suspension seat support. [Results] The gluteal peak pressures were decreased significantly in the suspension seat support versus the general chair. The trunk flexion angle was also decreased significantly in the suspension seat support compared with the general chair. [Conclusions] This study suggests that the suspension seat support chair contributes to preventing abnormal gluteal pressure and a slumped sitting posture.

  19. Compliance with Use of Seat Belt among Commercial Drivers in a Nigerian Community

    Directory of Open Access Journals (Sweden)

    Oluwole C. Omolase

    2012-06-01

    Full Text Available AIM: This study aimed at determining compliance with use of seat belt among commercial intercity drivers. METHOD: This is a descriptive cross-sectional study conducted in Owo, South West Nigeria among commercial intercity drivers between June and September, 2009. Ethical clearance was obtained from the Ethical Review Committee of Federal Medical Centre, Owo, Ondo State, Nigeria prior to commencement of this study. The permission of the leadership of Road Transport Workers’ Union was also sought and obtained. Ninety intercity commercial drivers out of the estimated one hundred and sixty intercity commercial drivers in the community were enrolled in this study. Informed consent was obtained from each of the respondents. The data obtained was collated and analyzed with SPSS 15.0.1 statistical soft ware version. RESULTS: Ninety respondents were enrolled in this study. The driving experience of the respondents revealed that most respondents: 53 (58.9% had more than 20 years driving experience. Most respondents;78 (86.7% complied with use of seat belt .The main barrier to compliance with seat belt was short trip;28 (50.9%.Most respondents; 67 (74.4%were in support of penalization of defaulters. The major source of awareness about seat belt was Federal Road Safety Corps;59 (65.6%. CONCLUSION: Most respondents complied with use of seat belt. The major barrier to compliance with seat belt was short trip within the community. The Federal Road Safety Corps should enforce compliance with the use of seat belt most especially within communities. [TAF Prev Med Bull 2012; 11(3.000: 281-286

  20. Compatibility of booster seats and vehicles in the U.S. market.

    Science.gov (United States)

    Bing, Julie A; Agnew, Amanda M; Bolte, John H

    2018-05-19

    The objective of this study was to analyze booster and rear vehicle seat dimensions to identify the most frequent compatibility problems. Measurements were collected from 40 high-back and backless boosters and 95 left rear and center rear row seating positions in 50 modern vehicles. Dimensions were compared for 3,800 booster/vehicle seat combinations. For validation and estimation of tolerance and correction factors, 72 booster installations were physically completed and compared with measurement-based compatibility predictions. Dimensions were also compared to the International Organization for Standardization (ISO) volumetric envelopes of forward-facing child restraints and boosters. Seat belt buckles in outboard positions accommodated the width of boosters better than center positions (success rates of 85.4 and 34.7%, respectively). Adequate head restraint clearance occurred in 71.9 to 77.2% of combinations, depending on the booster's head support setting. Booster recline angles aligned properly with vehicle seat cushion angles in 71.5% of combinations. In cases of poor angle alignment, booster angles were more obtuse than the vehicle seat angles 97.7% of the time. Head restraint interference exacerbated angle alignment issues. Data indicate success rates above 90% for boosters being fully supported by the length of the seat cushion and for adequate height clearance with the vehicle roofline. Comparison to ISO envelopes indicates that most boosters on the U.S. market are taller and angled more obtusely than ISO target envelopes. This study quantifies some of the common interferences between boosters and vehicles that may complicate booster usage. Data are useful for design and to prioritize specific problem areas.

  1. A joint econometric analysis of seat belt use and crash-related injury severity.

    Science.gov (United States)

    Eluru, Naveen; Bhat, Chandra R

    2007-09-01

    This paper formulates a comprehensive econometric structure that recognizes two important issues in crash-related injury severity analysis. First, the impact of a factor on injury severity may be moderated by various observed and unobserved variables specific to an individual or to a crash. Second, seat belt use is likely to be endogenous to injury severity. That is, it is possible that intrinsically unsafe drivers do not wear seat belts and are the ones likely to be involved in high injury severity crashes because of their unsafe driving habits. The preceding issues are considered in the current research effort through the development of a comprehensive model of seat belt use and injury severity that takes the form of a joint correlated random coefficients binary-ordered response system. To our knowledge, this is the first instance of such a model formulation and application not only in the safety analysis literature, but in the econometrics literature in general. The empirical analysis is based on the 2003 General Estimates System (GES) data base. Several types of variables are considered to explain seat belt use and injury severity levels, including driver characteristics, vehicle characteristics, roadway design attributes, environmental factors, and crash characteristics. The results, in addition to confirming the effects of various explanatory variables, also highlight the importance of (a) considering the moderating effects of unobserved individual/crash-related factors on the determinants of injury severity and (b) seat belt use endogeneity. From a policy standpoint, the results suggest that seat belt non-users, when apprehended in the act, should perhaps be subjected to both a fine (to increase the chances that they wear seat belts) as well as mandatory enrollment in a defensive driving course (to attempt to change their aggressive driving behaviors).

  2. Atom-bond connectivity index and diameter of graphs

    Directory of Open Access Journals (Sweden)

    Lin WU

    2016-12-01

    Full Text Available For further study of the numerous nice properties of topological indices in physical and chemical fields, it is worth considering the relation between a degree-based index and a distance-based index. With the fact that diameter is an invariant based on distance, the relations between atom-bond connectivity index, diameter in trees and unicyclic graphs are studied. Based on relative lemma, the relation between atom-bond connectivity index and diameter in tree and unicyclic graphs is investigated, then the sharp lower bounds of the difference of index and diameter are given.

  3. Factors associated with rear seating of children in motor vehicles: a study in two low-income, predominantly Hispanic communities.

    Science.gov (United States)

    Greenberg-Seth, Jennifer; Hemenway, David; Gallagher, Susan S; Lissy, Karen S; Ross, Julie B

    2004-07-01

    This study examined child seating patterns in two predominantly low-income, Hispanic communities in Massachusetts. The purpose was to determine the factors associated with child rear seating in the community as a whole and for a subset of Hispanic motorists. Five hundred and five vehicles carrying child passengers and no adult other than the driver were observed in parking lots of fast food restaurants and grocery stores. Four hundred and thirty-two vehicle drivers agreed to be interviewed. A child was defined as a passenger younger than age 12 as determined by appearance and height (head below the vehicle headrest when seated). Variables under study included driver gender, age, ethnicity, and educational attainment; driver shoulder belt use; driver perception of passenger-side airbag presence; and the number and ages of children in the car. Overall, 51% of vehicles were observed with all children seated in the rear. In a bivariate analysis, child rear seating was strongly associated with female drivers ( P = 0.01), younger drivers ( P = 0.02) driver shoulder belt use ( P safety behavior (e.g. seat belt use). Messages should be culturally appropriate and should emphasize driver seat belt use in conjunction with rear seating and the importance of rear seating regardless of the presence of a passenger-side airbag.

  4. Research Paper: Impact of Air Seat Cushions and Ball Chairs on Classroom Behavior of Students with Autism Spectrum Disorder

    Directory of Open Access Journals (Sweden)

    Nader Matin Sadr

    2016-07-01

    Conclusion In the present study, therapy balls and or cushioned chairs for ASD students facilitated in-seat and on-task behaviors and improved classroom performance. It seems that using these alternative seating chairs can satisfy the subjects’ needs to sensory stimuli, and therefore, decreases their sensory seeking behaviors which interferes with their academic achievements. While, using therapy ball chairs for these students may facilitate in-seat behavior and decrease autistic behavior in class, the student’s response to dynamic seating is different individually. Therefore, chair selection must be based on vestibular reaction of the students.

  5. Whole-body Vibration Exposure Intervention among Professional Bus and Truck Drivers: A Laboratory Evaluation of Seat-suspension Designs.

    Science.gov (United States)

    Blood, Ryan P; Yost, Michael G; Camp, Janice E; Ching, Randal P

    2015-01-01

    Long-term exposure to seated whole-body vibration (WBV) is one of the leading risk factors for the development of low back disorders. Professional bus and truck drivers are regularly exposed to continuous WBV, since they spend the majority of their working hours driving heavy vehicles. This study measured WBV exposures among professional bus and truck drivers and evaluated the effects of seat-suspension designs using simulated field-collected data on a vibration table. WBV exposures were measured and compared across three different seat designs: an air-ride bus seat, an air-ride truck seat, and an electromagnetically active (EM-active) seat. Air-ride seats use a compressed-air bladder to attenuate vibrations, and they have been in operation throughout the transportation industry for many years. The EM-active seat is a relatively new design that incorporates a microprocessor-controlled actuator to dampen vibration. The vibration table simulated seven WBV exposure scenarios: four segments of vertical vibration and three scenarios that used field-collected driving data on different road surfaces-a city street, a freeway, and a section of rough roadway. The field scenarios used tri-axial WBV data that had been collected at the seat pan and at the driver's sternum, in accordance with ISO 2631-1 and 2631-5. This study found that WBV was significantly greater in the vertical direction (z-axis) than in the lateral directions (x-and y-axes) for each of the three road types and each of the three types of seats. Quantitative comparisons of the results showed that the floor-to-seat-pan transmissibility was significantly lower for the EM-active seat than for either the air-ride bus seat or the air-ride truck seat, across all three road types. This study also demonstrated that seat-suspension designs have a significant effect on the vibrations transmitted to vehicle operators, and the study's results may prove useful in designing future seat suspensions.

  6. Ergonomic Evaluation of Space Shuttle Light-Weight Seat Lever Position and Operation

    Science.gov (United States)

    Maida, J.; Rajulu, Sudhakar L.; Bond, Robert L. (Technical Monitor)

    2000-01-01

    During a Shuttle flight in the early part of 1999, one of the crewmembers was unable to operate the backrest lever for the light-weight seat in microgravity. It is essential that the crewmembers are able to adjust this back-rest lever, which is titled forward 2 degrees from vertical during launch and then moved backwards to 10 degrees aft of vertical upon reaching orbit. This adjustment is needed to cushion the crewmembers during an inadvertent crash landing situation. The original Shuttle seats, which had seat controls located on the front left and right sides of the seat, were replaced recently with the new light-weight seats. The controls for these new, seats were moved to the night side with one control at the front and the other at the back. While it was uncertain whether the problem encountered was unique to that crewmember or not it was clear to the personnel responsible for maintaining the Shuttle seats that not knowing the cause of the problem posed a safety concern for NASA. Hence the Anthropometry and Biomechanics Facility (ABF) of the Johnson Space Center was requested to perform an evaluation of the seat controls and provide NASA with appropriate recommendations on whether the seat lever positions and operations should be modified. The ABF designed an experiment to investigate the amount of pull force exerted by subjects, wearing an unpressurized or pressurized crew launch escape suit, when controls were placed in the front and back (on the right side) of the light-weight seat. Single-axis load cells were attached to the seat levers, which measured the maximum static pull forces that were exerted by the subjects. Twelve subjects, six male and six female, participated in this study. Each subject was asked to perform the pull test at least three times for each combination of lever position and suit pressure conditions. The results from this study showed that as a whole (or in general), the subjects were able to pull on the lever at the back position with

  7. PWR fuel pin diameter optimisation studies and economic analyses for uranium nitride fuel - 5048

    International Nuclear Information System (INIS)

    Thomas, G.M.; Grove, C.

    2015-01-01

    Alternative advanced fuels are currently being investigated by the nuclear industry. For example, research is underway into the possibility of replacing industry standard UO 2 fuel with Accident Tolerant Fuels (ATF) such as uranium nitride (UN). The higher density of UN compared with UO 2 results in a reduction in neutron moderation due to the lower hydrogen to heavy metal ratio (H/HM) for a given fuel assembly geometry in water. This suggests a different optimum UN fuel pin diameter in order to maximise lifetime average reactivity. If a smaller UN pellet/cladding diameter is adopted then the H/HM ratio is increased, leading to an increase in reactivity at lower burnup (followed by a reduction at higher burnup due to reduced Pu production). Preliminary studies have also indicated that a reduction of the UN pellet diameter with respect to standard UO 2 fuel could be beneficial to economic performance. This paper describes an approach used to determine the optimum fuel pin diameter for UN fuel in an AP1000 PWR using Studsvik CASMO4/SIMULATE3 neutronics codes. The objective is to maximise the fuel's lifetime average reactivity while staying within typical PWR nuclear design safety limits. The calculations demonstrate that the pin diameter should be decreased to optimise the fuel reactivity. However, if the pin diameter is decreased too much a highly undesirable positive moderator temperature coefficient can result. Economics calculations show that if UN fuel is used there is a potential economic benefit - in the region of 3 million dollar per 18-month reload if generic openly available cost data is used

  8. On the Modeling of a MEMS Based Capacitive Accelerometer for Measurement of Tractor Seat Vibration

    Directory of Open Access Journals (Sweden)

    M. Alidoost

    2010-04-01

    Full Text Available Drivers of heavy vehicles often face with higher amplitudes of frequencies range between 1-80 Hz. Hence, this range of frequency results in temporary or even sometimes permanent damages to the health of drivers. Examples for these problems are damages to the vertebral column and early tiredness, which both reduce the driver’s performance significantly. One solution to this problem is to decrease the imposed vibration to the driver’s seat by developing an active seat system. These systems require an online measuring unit to sense vibrations transferred to the seat. The measuring unit can include a capacitive micro-accelerometer on the basis of MEMS which measure online vibrations on the seat. In this study, the mechanical behavior of a capacitive micro-accelerometer for the vibration range applied to a tractor seat has been simulated. The accelerometer is capable to measure step, impact and harmonic external excitations applied to the system. The results of the study indicate that, with increasing the applied voltage, the system sensitivity also increases, but the measuring range of vibrations decreases and vice versa. The modeled accelerometer, at damping ratio of 0.67 is capable to measure accelerations within the frequency range of lower than 130 Hz.

  9. Evaluating the impact of child safety seat check-up events on parental knowledge.

    Science.gov (United States)

    Herring, Ashley B; Jones, Ches; Nunez, Casandra

    2002-12-01

    Riding unrestrained is the greatest risk factor for death and injury among children in motor vehicles. Restraining a child can reduce the risk of death for that child by up to 71%. However, despite increased awareness, child safety seat usage rates are still disturbingly low. The purpose of this study was to evaluate the impact that child safety seat check-up events have on parental knowledge on child safety seats and installation. The subjects for this study were 101 parents/caregivers who attended child safety seat check-up events in northwest Arkansas from May 2000 through June 2001. A 20-item survey was conducted via the telephone. Results showed that the check-up events in northwest Arkansas have had an impact on self-efficacy. The participants of the events were primarily Caucasian and females in the 30-34 age group. Nine of 10 subjects scored in the high knowledge category. Conclusions are that check-up events do have an impact on parental knowledge and are accepted by the target group. Additionally, participants believed that car seats are of great importance and do protect their children in the event of a crash.

  10. How Safe are “Safe” Seats? A Comparison of Voluntary and Compulsory Voting Systems

    Directory of Open Access Journals (Sweden)

    Tim Fry

    2009-06-01

    Full Text Available Many observers have expressed concern that low voter turnout reflects an acute shortcoming in democratic politics. One proposed remedy, making voting compulsory, has garnered increasing attention among academics over recent years. Our article focuses on some of the technical properties of compulsory voting rules (CVR while ignoring the philosophical debate over whether voting should be an obligation or a right. Using basic probability analysis, we compare a voluntary voting rule (VVR to a compulsory one. We show that, under certain conditions, an electoral seat or district can become safer – or less competitive – with the imposition of a CVR. We also discuss some political implications of our analysis. For example, when generalized to, say, the national political system, this result implies fewer competitive seats in a CVT compared to a VVR, everything else equal. We contend that, because fewer seats will be “in play” in a CVT, CVRs should exhibit lower turnover of seats. Also, political suppliers can be expected to more narrowly focus their attention – and resources – on this smaller set of competitive seats than we would expect unver a VVR.

  11. A cost benefit analysis of an enhanced seat belt enforcement program in South Africa.

    Science.gov (United States)

    Harris, G T; Olukoga, I A

    2005-04-01

    To examine whether a program to increase the wearing of seat belts in a South African urban area would be worthwhile in societal terms. A cost benefit analysis of a one year enhanced seat belt enforcement program in eThekwini (Durban) Municipality. Data were drawn from two main sources--a 1998 study of the cost of road crashes in South Africa and, given the absence of other data, a meta-analysis of the effectiveness of various types of interventions to reduce road crash casualties in the United States--and were analyzed using cost benefit analysis. A program designed to enforce greater wearing of seat belts, estimated to cost 2 million rand in one year, could be reasonably expected to increase seat belt usage rates by 16 percentage points and reduce fatalities and injuries by 9.5%. This would result in saved social costs of 13.6 million rand in the following year or a net present value of 11.6 million rand. There would also be favorable consequences for municipal finances. Investment in a program to increase seat belt wearing rates is highly profitable in societal terms.

  12. Validation of the Swedish translation of eating assessment tool (S-EAT-10).

    Science.gov (United States)

    Möller, Riitta; Safa, Stephanie; Östberg, Per

    2016-07-01

    Conclusion The Swedish Eating Assessment Tool (S-EAT-10) is a reliable and valid self-administered tool in assessment of dysphagia in adult Swedish patients with high internal consistency, reliability, and discriminative validity. The normative data show that a score of 3 or more is abnormal. S-EAT-10 is recommended to be used in preliminary diagnostics of dysphagia. Objective To translate and adapt the EAT-10 for use in the Swedish patient population, and to present norms and measures of discriminative validity and reliability of a Swedish version of the Eating Assessment Tool-10 (S-EAT-10). Methods Prospective consecutive clinical study. In total, 134 community-dwelling adult respondents/controls without dysphagia completed the S-EAT-10, as did 119 patients referred for fiberendoscopic evaluation of swallowing at Karolinska University Hospital, Stockholm, Sweden. Patient vs control status was used as the criterion for discriminative validity assessment by logistic regression analysis. Results The mean S-EAT-10 score was 0.2 (range = 0-3) for controls and 18 (range = 0-38) for patients. Based on a cut-off score of ≥ 3 which was considered to be reflective of abnormalities, sensitivity was 98.5% and specificity 94.1%. Internal consistency reliability was high (Cronbach's alpha = 0.88), as was test-re-test reliability (ICC = 0.90).

  13. Experimental Investigation of a Temperature-Controlled Car Seat Powered by an Exhaust Thermoelectric Generator

    Science.gov (United States)

    Du, H.; Wang, Y. P.; Yuan, X. H.; Deng, Y. D.; Su, C. Q.

    2016-03-01

    To improve the riding comfort and rational utilization of the electrical energy captured by an automotive thermoelectric generator (ATEG), a temperature-controlled car seat was constructed to adjust the temperature of the car seat surface. Powered by the ATEG and the battery, the seat-embedded air conditioner can improve the riding comfort using a thermoelectric device to adjust the surface temperature of the seat, with an air duct to regulate the cold side and hot side of the thermoelectric device. The performance of the thermoelectric cooler (TEC) and theoretical analysis on the optimum state of the TEC device are put forward. To verify the rationality of the air duct design and to ensure sufficient air supply, the velocity field of the air duct system was obtained by means of the finite element method. To validate the reliability of the numerical simulation, the air velocity around the thermoelectric device was measured by a wind speed transmitter. The performance of the temperature-controlled car seat has been validated and is in good agreement with bench tests and real vehicle tests.

  14. Flow Characteristics and Sizing of Annular Seat Valves for Digital Displacement Machines

    Directory of Open Access Journals (Sweden)

    Christian Nørgård

    2018-01-01

    Full Text Available This paper investigates the steady-state flow characteristics and power losses of annular seat valves for digital displacement machines. Annular seat valves are promising candidates for active check-valves used in digital displacement fluid power machinery which excels in efficiency in a broad operating range. To achieve high machine efficiency, the valve flow losses and the required electrical power needed for valve switching should be low. The annular valve plunger geometry, of a valve prototype developed for digital displacement machines, is parametrized by three parameters: stroke length, seat radius and seat width. The steady-state flow characteristics are analyzed using static axi-symmetric computational fluid dynamics. The pressure drops and flow forces are mapped in the valve design space for several different flow rates. The simulated results are compared against measurements using a valve prototype. Using the simulated maps to estimate the flow power losses and a simple generic model to estimate the electric power losses, both during digital displacement operation, optimal designs of annular seat valves, with respect to valve power losses, are derived under several different operating conditions.

  15. The Effect of Cycling Intensity on Cycling Economy During Seated and Standing Cycling.

    Science.gov (United States)

    Arkesteijn, Marco; Jobson, Simon; Hopker, James; Passfield, Louis

    2016-10-01

    Previous research has shown that cycling in a standing position reduces cycling economy compared with seated cycling. It is unknown whether the cycling intensity moderates the reduction in cycling economy while standing. The aim was to determine whether the negative effect of standing on cycling economy would be decreased at a higher intensity. Ten cyclists cycled in 8 different conditions. Each condition was either at an intensity of 50% or 70% of maximal aerobic power at a gradient of 4% or 8% and in the seated or standing cycling position. Cycling economy and muscle activation level of 8 leg muscles were recorded. There was an interaction between cycling intensity and position for cycling economy (P = .03), the overall activation of the leg muscles (P = .02), and the activation of the lower leg muscles (P = .05). The interaction showed decreased cycling economy when standing compared with seated cycling, but the difference was reduced at higher intensity. The overall activation of the leg muscles and the lower leg muscles, respectively, increased and decreased, but the differences between standing and seated cycling were reduced at higher intensity. Cycling economy was lower during standing cycling than seated cycling, but the difference in economy diminishes when cycling intensity increases. Activation of the lower leg muscles did not explain the lower cycling economy while standing. The increased overall activation, therefore, suggests that increased activation of the upper leg muscles explains part of the lower cycling economy while standing.

  16. Reliability and Criterion-Related Validity of the Seated Posture Scale.

    Science.gov (United States)

    Barks, Lelia; Garvan, Cynthia; Crane, Barbara; Peterson, Matthew; Brown, Lisa M; Powell-Cope, Gail

    2018-03-19

    Earlier, we reported development and initial testing of a rapid, low burden measure of wheelchair seated posture (the Seated Posture Scale [SPS]) for research and clinical use. The purpose of this study was to test the intrarater reliability, interrater reliability, and criterion related validity of the SPS. We used a descriptive design to test and develop the instrument. We used the method described by Walter, Donner, and Eliasziw to determine 46 participants were needed, from two Veterans Administration nursing homes or CLCs (community living centers). Using a digital goniometer to score rapidly and with two trained raters, we scored individual participants simultaneously and again in succession. For criterion related concurrent validity, we also scored each participant with Section 2 of the Seated Postural Control Measure for Adults. Intrarater reliability, interrater reliability, and criterion related, concurrent validity were assessed using kappa statistics for individual instrument items (and corresponding 95% confidence intervals where appropriate) and intraclass correlation coefficients (ICC) for total scores. The intrarater intraclass correlation coefficient (ICC) was .995; interrater ICC was .80; interrater reliability kappas ranged from -.03 to .80. Criterion-related, concurrent validity kappas ranged from .13 to .91. ICC for total scores was .85. The SPS has sufficient preliminary validity and reliability to support measurement of wheelchair-seated posture in outcomes research and clinical use. In the future, rehabilitation nurses may use the SPS to improve management of wheelchair seated posture, to improve clinical outcomes, particularly for those who do not reposition themselves.

  17. Effectiveness of primary and secondary enforced seat belt laws.

    Science.gov (United States)

    Rivara, F P; Thompson, D C; Cummings, P

    1999-01-01

    The objective of this study was to determine the relative efficacy of primary and secondary enforced motor vehicle occupant restraint laws on the outcomes of restraint use, crash-related mortality, and crash-related injuries. We used the Cochrane Collaboration search strategy to search the following electronic databases: MEDLINE, EMBASE, National Technical Information Service (NTIS), Psyc-INFO, ERIC, Nursing and Allied Health (CINAHL), Transportation Research Information Service (TRIS), and EI Compendex. The reference lists from each potentially eligible study were checked, and knowledgeable people in the field were contacted, for additional leads to published reports. Studies had to include a comparison of primary enforcement law to no law, secondary enforcement law to no law, or a primary to a secondary law. Any study design was acceptable. Acceptable outcome measures included observed restraint use, and counts or rates of deaths or serious injuries. Data were collected using a standard abstract reporting from. Relative differences in outcomes and absolute differences were calculated when possible. We identified 48 studies for the review. When places or time periods with primary enforcement laws were compared to those without such laws, the relative prevalence of seat belt use ranged from 1.5 to 4.5; the prevalence differences ranged from 10 to 50 per 100 observed drivers. Secondary laws had smaller effects. Two studies evaluated a change in law from secondary to primary enforcement; this was associated with an increase in belt use 6 months later of 5.3 per 100 observed drivers in Louisiana and 18 per 100 drivers in California. Primary enforcement laws were associated with a relative risk of death in MV crashes of .54 to .97. The reduction in mortality associated with secondary enforcement laws was much more modest, with relative risks estimates of .81 to 1.025. Primary enforcement laws were associated with a relative risk of severe injuries of .20 to .89; the

  18. Reduction of nanowire diameter beyond lithography limits by controlled catalyst dewetting

    Science.gov (United States)

    Calahorra, Yonatan; Kerlich, Alexander; Amram, Dor; Gavrilov, Arkady; Cohen, Shimon; Ritter, Dan

    2016-04-01

    Catalyst assisted vapour-liquid-solid is the most common method to realize bottom-up nanowire growth; establishing a parallel process for obtaining nanoscale catalysts at pre-defined locations is paramount for further advancement towards commercial nanowire applications. Herein, the effect of a selective area mask on the dewetting of metallic nanowire catalysts, deposited within lithography-defined mask pinholes, is reported. It was found that thin disc-like catalysts, with diameters of 120-450 nm, were transformed through dewetting into hemisphere-like catalysts, having diameters 2-3 fold smaller; the process was optimized to about 95% yield in preventing catalyst splitting, as would otherwise be expected due to their thickness-to-diameter ratio, which was as low as 1/60. The catalysts subsequently facilitated InP and InAs nanowire growth. We suggest that the mask edges prevent surface migration mediated spreading of the dewetted metal, and therefore induce its agglomeration into a single particle. This result presents a general strategy to diminish lithography-set dimensions for NW growth, and may answer a fundamental challenge faced by bottom-up nanowire technology.

  19. Investigation of the relations between screw diameter and pilot hole diameter with withdrawal resistance in LVL for establishing regression model

    Directory of Open Access Journals (Sweden)

    mossayeb dalvand

    2018-02-01

    Full Text Available In this study, variation in screw diameter and corresponding pilot hole, and relationship between these variables with withdrawal resistance for establishing multiple linear regression model was investigated. In this investigation 9-ply LVL was made of poplar (Populus deltoids. LVL was produced with polyvinyl acetate adhesive. Test specimens were prepared from LVL produced with dimensions of 7.5 * 7.5 cm. Dimension of pilot hole embedded in specimens at 4 levels (50, 60, 70 and 80 present of nominal screw diameter. The test Specimens were studied with nominal screw diameter 4.2, 5, 6 and 7mm were produced. Withdrawal resistance of screw was tested from surface and, edge and cross-sections. Results have shown that withdrawal resistance from edge (perpendicular to grain was more than withdrawal resistance from face and cross-section (parallel to grain. Also the results have shown that withdrawal resistance of different screw diameter decreased with increase of pilot hole diameter, but withdrawal resistance increased with increase of screw diameter itself. The highest withdrawal resistance was obtained from screw 7 mm in diameters and predrilled hole diameter 50% of screw diameter. The lowest withdrawal resistance was observed from screw 4.2 mm in diameter and predrilled hole diameter 80% of screw diameter. Finally multiple linear regression models ys= 3.055+.411X1-3.358X2, ye║=2.6361.694X1+.089X2 and ye┴= 2.334+.509X1-2.901X2 were obtained to predict of withdrawal resistance for face, cross-section and edge respectively.

  20. Isotachophoresis system having larger-diameter channels flowing into channels with reduced diameter and with selectable counter-flow

    Energy Technology Data Exchange (ETDEWEB)

    Mariella, Jr., Raymond P.

    2018-03-06

    An isotachophoresis system for separating a sample containing particles into discrete packets including a flow channel, the flow channel having a large diameter section and a small diameter section; a negative electrode operably connected to the flow channel; a positive electrode operably connected to the flow channel; a leading carrier fluid in the flow channel; a trailing carrier fluid in the flow channel; and a control for separating the particles in the sample into discrete packets using the leading carrier fluid, the trailing carrier fluid, the large diameter section, and the small diameter section.

  1. Sex Dimorphism of the Heart Diameters and Cardiothoracic Ratios ...

    African Journals Online (AJOL)

    Objective: To determine gender associated differences in the cardiothoracic ratio (CTR) and heart diameters in a normal Nigerian population. Subject and Method: The normal heart diameters and cardiothoracic ratios were measured from posteroanterior (PA) chest radiographs of healthy 510 male and 508 female ...

  2. Generalized height-diameter models for Populus tremula L. stands

    African Journals Online (AJOL)

    USER

    2010-07-12

    Jul 12, 2010 ... Using permanent sample plot data, selected tree height and diameter functions were evaluated for their predictive abilities for Populus tremula stands in Turkey. Two sets of models were evaluated. The first set included five models for estimating height as a function of individual tree diameter; the second set.

  3. Mean particle diameters : From statistical definition to physical understanding

    NARCIS (Netherlands)

    Alderliesten, M.

    2008-01-01

    Mean particle diameters are important for the science of particulate systems. This thesis deals with a definition system for these mean diameters, called Moment-Ratio (M-R) definition system, and provides a general statistical and physical basis. Also, the current DIN/ISO definition system is

  4. Growth process and diameter structure of Pinus tabulaeformis forest ...

    African Journals Online (AJOL)

    STORAGESEVER

    2009-10-19

    Oct 19, 2009 ... Using stem analysis method, the biomass, growing process and diameter structure of 21-year shady and sunny slope Pinus tabulaeformis forest were investigated in hilly loess-gully region. Results showed that there were distinct difference in the indexes, tree height, diameter at breast height (DBH).

  5. Mean Normal Portal Vein Diameter Using Sonography among ...

    African Journals Online (AJOL)

    BACKGROUND: Mean portal vein diameter is considered as the best indicator for portal hypertension. However, the cutoff point differs from study to study (above 10-15 mm) despite the existence of normal mean portal vein diameter between 10-15 mm in different settings.This implies the existence of limited evidence on ...

  6. Growth process and diameter structure of Pinus tabulaeformis forest ...

    African Journals Online (AJOL)

    Using stem analysis method, the biomass, growing process and diameter structure of 21-year shady and sunny slope Pinus tabulaeformis forest were investigated in hilly loess-gully region. Results showed that there were distinct difference in the indexes, tree height, diameter at breast height (DBH) and timber volume ...

  7. Relationships between stem diameter at breast height (DBH), tree ...

    African Journals Online (AJOL)

    Trees show considerable variation and flexibility in their size of crowns, height and stem diameter at breast height (dbh). Dbh has been used as predictor variables in diameter and height growth equations. Relationships between dbh, tree height, crown length, crown height and crown ratio of Vitellaria paradoxa were ...

  8. Generalized height-diameter models for Populus tremula L. stands ...

    African Journals Online (AJOL)

    On average, by including stand level attributes, root mean square values were reduced by 21 cm. In the second set, the best results were obtained by the Schnute's function. In this function, dominant diameter and dominant height independent variables in addition to tree diameter were found significant at 0.01 significant ...

  9. Relationships between diameter and height of trees in natural ...

    African Journals Online (AJOL)

    Relationships between diameter and height of trees in natural tropical forest in Tanzania. Wilson A Mugasha, Ole M Bollandsås, Tron Eid. Abstract. The relationship between tree height (h) and tree diameter at breast height (dbh) is an important element describing forest stands. In addition, h often is a required variable in ...

  10. Influence of high intensity ultrasound with different probe diameter ...

    African Journals Online (AJOL)

    The main goal of this research is to analyze the influence of ultrasonic probe diameters (7 and 10 mm) of high-intensity ultrasound with constant frequency (30 kHz) on the degree of homogenization (variance) of cow milk. Influence of different probe diameters on the physical properties of cow milk was also tested. Changes ...

  11. Wheelchair Seating Assessment and Intervention: A Comparison Between Telerehabilitation and Face-to-Face Service

    Science.gov (United States)

    Barlow, Ingrid G; Liu, Lili; Sekulic, Angela

    2009-01-01

    This study compared outcomes of wheelchair seating and positioning interventions provided by telerehabilitation (n=10) and face-to-face (n=20; 10 in each of two comparison groups, one urban and one rural). Comparison clients were matched to the telerehabilitation clients in age, diagnosis, and type of seating components received. Clients and referring therapists rated their satisfaction and identified if seating intervention goals were met. Clients recorded travel expenses incurred or saved, and all therapists recorded time spent providing service. Wait times and completion times were tracked. Clients seen by telerehabilitation had similar satisfaction ratings and were as likely to have their goals met as clients seen face-to-face; telerehabilitation clients saved travel costs. Rural referring therapists who used telerehabilitation spent more time in preparation and follow-up than the other groups. Clients assessed by telerehabilitation had shorter wait times for assessment than rural face-to-face clients, but their interventions took as long to complete. PMID:25945159

  12. Need and Possibilities for Seat Belt Use Promotion in Bashkortostan, Russia

    Science.gov (United States)

    Akhmadeeva, Leila; Andreeva, Valentina A.; Sussman, Steve; Khusnutdinova, Zolya; Simons-Morton, Bruce G.

    2009-01-01

    Bashkortostan is a republic in the Russian Federation with a population of 4.1 million. As with other health behaviors, the prevalence of seat belt use is low, which may account in part for the very high rate of motor-vehicle-related mortality in this republic. The authors discuss the need and potential for translating seat belt promotion programming from other Russian regions and other countries to Bashkortostan. The authors conclude that current policies developed in other countries could work well in the republic, if they are enforced. Meanwhile, initiatives such as the Sakhalin Road Safety Partnership offer great potential for translation in Bashkortostan as well as in other regions with similarly low seat belt use prevalence. PMID:18559882

  13. Optimization of geometry of annular seat valves suitable for Digital Displacement fluid power pumps/motors

    DEFF Research Database (Denmark)

    Rømer, Daniel; Johansen, Per; Pedersen, Henrik C.

    2013-01-01

    Digital Displacement Fluid Power is an upcoming technology setting new standards for the achievable efficiency of fluid power pumps and motors. The core element of the Digital Displacement technology is high performance electronically controlled seat valves, which must exhibit very low flow...... work an annular seat valve suitable for use in Digital Displacement units is considered, and the ring geometry is optimized using finite element analysis including non-linear material behaviour, contact elements and fluid pressure penetrating load, closely reflecting the actual load of the seat valve...... connected to a fluid pressure chamber. The search for optimal design points is conducted using a brute force strategy with subsequent selection of the dominating design points....

  14. Oil Stiction in Fast Switching Annular Seat Valves for Digital Displacement Fluid Power Machines

    DEFF Research Database (Denmark)

    Roemer, Daniel Beck; Johansen, Per; Pedersen, Henrik C.

    2014-01-01

    Digital Displacement (DD) fluid power machines utilizes electronically controlled seat valves connected to pressure chambers to obtain variable displacement with high operational efficiency and high bandwidth. To achieve high efficiency, fast valve switching is essential and all aspects related...... to the dynamic behaviour of the seat valves must be considered to optimize the machine efficiency. A significant effect influencing the valves switching performance is the presence of oil stiction when separating the contact surfaces in valve opening movement. This oil stiction force is limited by cavitation...... for low pressure levels, e.g. valves connected to the low pressure manifold, however for valves operated at higher pressure levels, the oil stiction force is dominating when the separating surfaces are close to contact. This paper presents an analytic solution to the oil stiction force for annular seat...

  15. Concepts and embodiment design of a reentry recumbent seating system for the NASA Space Shuttle

    Science.gov (United States)

    Mcmillan, Scott; Looby, Brent; Devany, Chris; Chudej, Chris; Brooks, Barry

    1993-01-01

    This report deals with the generation of a recumbent seating system which will be used by NASA to shuttle astronauts from the Russian space station Mir. We begin by examining the necessity for designing a special couch for the returning astronauts. Next, we discuss the operating conditions and constraints of the recumbent seating system and provide a detailed function structure. After working through the conceptual design process, we came up with ten alternative designs which are presented in the appendices. These designs were evaluated and weighted to systematically determine the best choice for embodiment design. A detailed discussion of all components of the selected system follows with design calculations for the seat presented in the appendices. The report concludes with an evaluation of the resulting design and recommendations for further development.

  16. Analysing of critical force effects of aircraft seat belt using truss elements

    Science.gov (United States)

    Klemenc, Marek; Markopoulos, Alexandros; Maršálek, Pavel

    2017-07-01

    This paper deals with the mathematical modelling of an aircraft seat belt crash test. The main goal is determination of a time course of the reactions in a lap belt anchoring points and their maximum values. This work was created on the basis of practical requirements from industry. Results are going to be reflected in developing a new type of aircraft seats. We mainly focus on the mathematical modelling of dynamic problems using the finite element method (FEM). Derived procedures are implemented in the Python programming language and are verified by several examples. A final calculation algorithm is applied on the analysis of the safety belt. We consider that a seat belt bending stiffness is very small compared to a tensile stiffness, therefore we used a 2D plane truss element.

  17. Performance robustness of a magnetorheological seat suspension to temperature variations using skyhook control

    Science.gov (United States)

    Wilson, Nicholas L.; Wereley, Norman M.; Choi, Young-Tai; Hiemenz, Gregory J.; Hu, Wei

    2009-03-01

    The harmonic steady-state responses of an MR seat isolator, designed and fabricated at the University of Maryland for the driver/commander seat of the Expeditionary Fighting Vehicle (EFV), are measured over a temperature range from 100°C to 1000°C, and the damper behavior is characterized using a variant of the nonlinear Bingham plastic model. The effect of damper self-heating on the model parameters is investigated and the trends with temperature variation are presented. Numerical simulations are carried out to investigate seat isolation performance across a broad frequency spectrum as temperature and payload vary. Conclusions are drawn about the performance robustness to temperature variations of the semi-active skyhook control algorithm typically utilized in vibration isolation problems.

  18. Car seat inspection among children older than 3 years: Using data to drive practice in child passenger safety.

    Science.gov (United States)

    Kroeker, Amber M; Teddy, Amy J; Macy, Michelle L

    2015-09-01

    Motor vehicle crashes are the leading cause of unintentional death and disability among children 4 years to 12 years of age in the United States. Despite the high risk of injury from motor vehicle crashes in this age group, parental awareness and child passenger safety programs in particular may lack focus on this age group. This is a retrospective cross-sectional analysis of child passenger safety seat checklist forms from two Safe Kids coalitions in Michigan (2013) to identify restraint type upon arrival to car seat inspections. Other variables were included if the coalition provided a new child safety seat and if the child had a sibling who underwent a car seat inspection. χ statistics were used to compare change in restraint use on arrival and at departure, the proportion of children attending a car seat inspection event by age, the age category of children by site, the proportion of children with siblings also undergoing a car seat inspection by age, and the distribution of a new child safety seat by age. Data were available from 1,316 Safe Kids Huron Valley and 3,215 Safe Kids Greater Grand Rapids car seat inspections. Just 10.8% of the total seats inspected were booster seats. Child safety seats for infant and young children were more commonly inspected (rear-facing carrier [40.3%], rear-facing convertible [10.2%], and forward-facing [19.3%] car seats). Few children at inspections used a seat belt only (5.4%) or had no restraint (13.8%). Children 4 years and older were found to be in a suboptimal restraint at least 30% of the time. Low proportions of parents use car seat inspections for children in the booster seat age group. The proportion of children departing the inspection in a more protective restraint increased with increasing age. This highlights an area of weakness in child passenger safety programs and signals an opportunity to strengthen efforts on The Booster Age Child. Epidemiologic/prognostic study, level III.

  19. Diameter of common bile duct: what are the predicting factors?

    Directory of Open Access Journals (Sweden)

    Atoosa Adibi

    2007-07-01

    Full Text Available

    BACKGROUND: This was a study to determine the correlation between the common bile duct (CBD diameter and demographic data, fasting, and the history of opium addiction.
    METHODS: This was a cross-sectional study on 375 patients (>16 years old including 219 females and 156 males. They had no evident hepatobiliary or pancreatic disease and underwent abdominopelvic ultrasonography for measurement of their CBD diameter. Ultrasound (US was performed to measure CBD diameter at the porta hepatis (proximal part and behind the head of the pancreas (distal part. Correlation coefficients for the association between CBD diameter and predictive factors were calculated. t-test was applied to compare the means between the groups.
    RESULTS: The mean CBD diameter (1 standard deviation, in proximal and distal parts were 3.64 mm (±1.2 and 3.72 mm (±1.2, respectively. The CBD diameters (proximal and distal were significantly (P<0.05 correlated with age (r = 0.55 and 0.54, respectively, BMI (r = 0.25 and 0.27, respectively and portal vein diameter (r = 0.24 and 0.22, respectively. Distal diameter of CBD was significantly larger in opium addicts (5.66 ± 2.65 in comparison with non addicts (3.68 ± 1.17, P = 0.04.
    CONCLUSIONS: CBD diameter associates with age, BMI, portal vein diameter and opium addiction. CBD dilatation, if it can not be explained by age, opium usage or large BMI, should be evaluated further to rule out obstruction.
    KEY WORDS: Common bile duct, predicting factors, ultrasonography.

  20. Relation of Coronary Artery Diameters With Cardiorespiratory Fitness.

    Science.gov (United States)

    Ho, John S; Cannaday, John J; FitzGerald, Shannon J; Leonard, David; Finley, Carrie E; Wade, Wendy A; Reinhardt, Dale B; Ellis, Joe R; Barlow, Carolyn E; Haskell, William L; Defina, Laura F; Gibbons, Larry W; Cooper, Kenneth H

    2018-02-06

    Cardiorespiratory fitness is associated with reduced cardiovascular morbidity and mortality when adjusted for traditional risk factors. Mechanisms by which fitness reduces risk have been studied but remain incompletely understood. We hypothesize that higher fitness is associated with larger coronary artery diameters independent of its effect on traditional risk factors. Two independent measurements of the proximal diameters of the left main, left anterior descending, left circumflex, and right coronary arteries were obtained from gated multidetector computed tomography scans in 500 men from the Cooper Center Longitudinal Study (CCLS). Men with coronary artery calcium scores ≥10 were excluded. Fitness was measured with a maximal exercise treadmill test and reported by quintiles and as a function of METs. We then evaluated the relation between coronary artery diameters and fitness using mixed effect regression models. Higher fitness was associated with larger coronary artery diameters after adjustment for body surface area, smoking status, low-density lipoprotein and high-density lipoprotein cholesterol, resting systolic blood pressure, and serum glucose. When examined continuously, each MET increase in fitness was associated with a mean 0.03 ± 0.01 mm larger diameter of the left main, a 0.04 ± 0.01 mm larger diameter of the left anterior descending, a 0.05 ± 0.01 mm larger diameter of the left circumflex, and a 0.07 ± 0.01 mm larger diameter of the right coronary artery (p = 0.002). This correlation between fitness and coronary artery diameters was most prominent for fitness levels above 10 METs. In conclusion, higher fitness is associated with larger coronary artery diameters. Copyright © 2018 Elsevier Inc. All rights reserved.

  1. Exploring the functional impact of adaptive seating on the lives of individual children and their families: a collective case study.

    Science.gov (United States)

    Stier, Carly D; Chieu, Ivan B; Howell, Lori; Ryan, Stephen E

    2017-07-01

    This study examined parent-reported change in the functional performance of four school-aged children with wheeled mobility needs who had used a new adaptive seating system for 6 weeks. The collective case study involved four mothers whose children, ages 6-9 years, received a new adaptive seating system for a manual wheelchair or stroller. Mothers completed the Family Impact of Assistive Technology Scale for Adaptive Seating (FIATS-AS) at the time their child received a new seating system, and then after 6 weeks of daily use. Other questionnaires, health records, and semi-structured interviews provided additional data about the seating interventions and their functional effects on individual children and their families. The FIATS-AS detected overall functional gain in one family, and both gains and losses in 2-7 dimensions for all families. Functional status and change scores showed consistency with measures of seating intervention satisfaction, global functional change, and home participation. Interview themes also suggested consistency with change scores, but provided a deeper understanding of important factors that influenced adaptive seating outcomes. This study supports the need to explore further the complexity, temporality and meaningfulness of adaptive seating outcomes in individual children and their families. Implications for Rehabilitation Assistive technology practitioners need to adopt practical measurement strategies that consider the complexity, temporality, and meaningfulness of outcomes to make evidence-informed decisions about how to improve adaptive seating services and interventions. Health measurement scales that measure adaptive seating outcomes for service applications must have adequate levels of reliability and validity, as well as demonstrate responsive to important change over time for individual children and their families. Needs-specific measurement scales provide a promising avenue for understanding functional outcomes for

  2. Transoral robotic surgery in the seated position: Rethinking our operative approach.

    Science.gov (United States)

    Moore, Eric J; Van Abel, Kathryn M; Olsen, Kerry D

    2017-01-01

    Transoral surgery (TOS) is commonly performed in a supine patient with an oral retractor. Paradoxically, this strategy can create difficulty with visualizing and accessing pathology at the base of tongue, inferior pharynx, and larynx. We investigate the feasibility of TOS with the patient in the seated position. Pilot study. TOS utilizing the da Vinci Robotic Surgical Xi and Si systems (Intuitive Surgical, Sunnyvale, CA) was performed on a fresh cadaver placed in both the traditional supine position and the seated position. Transoral robotic surgery (TORS) in the seated position was then performed on two patients for a supraglottic laryngectomy and a hypopharyngeal carcinoma resection. Visualization of the entire upper aerodigestive tract was possible in the cadaver and two patients in the seated position. The Si was superior for docking, instrumentation, and assistant access. The minimum operating table height is critical for successful access. Advantages of this position included increased posterior airway/operative space by approximately 2 cm, ability to manipulate the surgical field (nonrigid retraction), and improved visualization. Surgical procedures were completed in comparable times compared with standard TORS procedures. There were no complications related to seated TORS. TORS in the seated position was both safe and effective in this pilot study. It allows the surgeon to optimally operate in the inferior pharynx and larynx without the limitation of line of site access and visualization. A paradigm shift in patient positioning during TOS may allow improved surgical access and even greater patient candidacy. Further clinical investigation into this technique is warranted. NA Laryngoscope, 127:122-126, 2017. © 2016 The American Laryngological, Rhinological and Otological Society, Inc.

  3. The influence of parental education and other socio-economic factors on child car seat use.

    Science.gov (United States)

    Rok Simon, Mateja; Korošec, Aleš; Bilban, Marjan

    2017-03-01

    The behaviour of parents in ensuring car passenger safety for their children is associated with socio-economic (SE) status of the family; however, the influence of parental education has rarely been researched and the findings are contradictory. The aim of the study was to clarify whether parental education influences the use of a child car seat during short rides. A cross-sectional survey was carried out in outpatient clinics for children's healthcare across Slovenia. 904 parents of 3-year-old children participated in the study; the response rate was 95.9%. A self-administered questionnaire was used. A binary multiple logistic regression was applied to assess the association between parental unsafe behaviour as dependent variable, and education and other SE factors as independent variables. 14.6% of parents did not use a child car seat during short rides. Families where mother had low or college education had higher odds of the non-use of a child car seat than families where mother had a university education. Single-parent families and those who lived in areas with low or medium SE status also had higher odds of the non-use of a child car seat. Low educational attainment influences parents' behaviour regarding the non-use of a child car seat. Low parental education is not the only risk factor since some highly educated parents also have high odds of unsafe behaviour. All parents should therefore be included in individually tailored safety counselling programmes. SE inequalities could be further reduced with provision of free child car seats for eligible families.

  4. Ergonomic Analysis of Tricycle Sidecar Seats: Basis for Proposed Standard Design

    Directory of Open Access Journals (Sweden)

    Michael C. Godoy

    2015-12-01

    Full Text Available Ergonomics (also called human factors engineering is the study of human characteristics for the appropriate design of the living and work environment. It is applied in various industrial areas which includes transportation.Tricycle being one of the most common means of public transportation in Lipa City has various adaptations to suit the culture, and environment. The purpose of this study is to analyze the variability in design of the tricycles in Lipa City, Philippines and propose a standard ergonomically designed tricycle sidecar seat for a greater population. The study was conducted at 26 tricycle terminals with 232 tricycle samples within Lipa City proper including the public market area where 400 commuters were given questionnaires to determine the risk factors associated with the existing tricycle sidecar seat design. Anthropometric measurements of 100 males and 100 female commuters were obtained together with the sidecar dimensions of 232 tricycles to substantiate the observed variations in design. Using the design for the average and design for the extremes, it was found out that most of the tricycles in Lipa City, Philippines have inappropriate inclined seat and lowered sidecar seat pan height which can result to leg and abdominal pain; narrowed seat pan depth which caused pressure on buttocks and legs; narrowed backrest width which can cause upper and low back pain; low backrest height that can pose upper back pain; which can also result to abdominal pain; inclined backrest and limited vertical clearance which can cause upper back pain and neck pain. The researcher proposed a sidecar seat design standard which can be used by the Land Transportation Office, and Land Transportation Franchising and Regulatory Board to provide ease, comfort, and convenience to the passengers.

  5. No small slam: increasing incidents of genitourinary injury from toilets and toilet seats.

    Science.gov (United States)

    Glass, Allison S; Bagga, Herman S; Tasian, Gregory E; McGeady, James B; McCulloch, Charles E; Blaschko, Sarah D; McAninch, Jack W; Breyer, Benjamin N

    2013-08-01

    To describe the epidemiology of genitourinary (GU) injury from toilets that present to USA Emergency rooms (ERs). The National Electronic Injury Surveillance System (NEISS) is a stratified probability sample of hospital ER visits for USA consumer product-related injuries. NEISS was used to estimate total toilet- and toilet seat-related GU injury for the years 2002-2010, as well as to describe demographics and injury characteristics. Analyses were performed using strata, primary sampling units and sample weights to accommodate the complex sample survey design. Data are reported as national estimates with 95% confidence intervals (CIs) provided. In all, 13 175 (95% CI 10 185-16 165) GU injuries related to toilets presented to ERs during 2002-2010. The most common mechanism involved crush from accidental fall of toilet seat, described in 9011 (68.4%, 95% CI 6907-11 115) cases. Most crush injuries were isolated to the penis (98.1%). Of crush injuries, 81.7% occurred in children aged 2-3 years and 99.3% occurred in the home. Crush injuries increased over the period 2002-2010 (P = 0.017) by ≈100 per year, ending with an estimated 1707 (95% CI 1011-2402) by 2010. Most patients who sustained toilet- and toilet seat-related GU injuries were treated in the ER and then discharged. While penile crush injury related to a toilet seat is an uncommon mechanism of urological injury in children, the number of incidents appears to be rising. These findings support educational efforts and interventions, such as exchange of heavy toilet seats with slow-close toilet seat technology. © 2013 BJU International.

  6. Influence of spacing on the survival, frequency of diameter classes and height/diameter ratio in Eucalyptus urophylla. [In Portuguese

    Energy Technology Data Exchange (ETDEWEB)

    Brandi, R.M.; Couto, L.; Neto, F. de P.

    1977-01-01

    Survival of hybrid (unspecified parentage) E. urophylla in Minas Gerais after 93 months ranged from 47.1% at a spacing of 2 x 2 m to 60.5% at 3 x 4 m. Close spacing gave the largest number of trees per unit area, but with smaller average diameter Height/diameter ratio was not influenced by spacing.

  7. Characteristics of the towns in the upper seat of Sighisoara in the middle ages

    Directory of Open Access Journals (Sweden)

    Borcoman, M.

    2011-01-01

    Full Text Available The young Hungarian Kingdom established in the 10th century aimed from the beginning at occupying Transylvania, the neighboring province across the forests. This was partly done in the next century, but especially through a colonization process of the territory with Szeckler and German population. The territorial organization of the province after the 14th century was done according to two independent administrative areas: The Szecklers’ territory and fundus regius (the territory inhabited by Saxons in Transylvania and under the institutional and administrative form of Seats. One of these, perhaps the oldest, i.e., the Seat of Sighişoara, is treated in our article.

  8. Automated recognition of rear seat occupants' head position using Kinect™ 3D point cloud.

    Science.gov (United States)

    Loeb, Helen; Kim, Jinyong; Arbogast, Kristy; Kuo, Jonny; Koppel, Sjaan; Cross, Suzanne; Charlton, Judith

    2017-12-01

    Child occupant safety in motor-vehicle crashes is evaluated using Anthropomorphic Test Devices (ATD) seated in optimal positions. However, child occupants often assume suboptimal positions during real-world driving trips. Head impact to the seat back has been identified as one important injury causation scenario for seat belt restrained, head-injured children (Bohman et al., 2011). There is therefore a need to understand the interaction of children with the Child Restraint System to optimize protection. Naturalistic driving studies (NDS) will improve understanding of out-of-position (OOP) trends. To quantify OOP positions, an NDS was conducted. Families used a study vehicle for two weeks during their everyday driving trips. The positions of rear-seated child occupants, representing 22 families, were evaluated. The study vehicle - instrumented with data acquisition systems, including Microsoft Kinect™ V1 - recorded rear seat occupants in 1120 driving 26 trips. Three novel analytical methods were used to analyze data. To assess skeletal tracking accuracy, analysts recorded occurrences where Kinect™ exhibited invalid head recognition among a randomly-selected subset (81 trips). Errors included incorrect target detection (e.g., vehicle headrest) or environmental interference (e.g., sunlight). When head data was present, Kinect™ was correct 41% of the time; two other algorithms - filtering for extreme motion, and background subtraction/head-based depth detection are described in this paper and preliminary results are presented. Accuracy estimates were not possible because of their experimental nature and the difficulty to use a ground truth for this large database. This NDS tested methods to quantify the frequency and magnitude of head positions for rear-seated child occupants utilizing Kinect™ motion-tracking. This study's results informed recent ATD sled tests that replicated observed positions (most common and most extreme), and assessed the validity of child

  9. Body height and arterial pressure in seated and supine young males during +2 G centrifugation

    DEFF Research Database (Denmark)

    Arvedsen, Sine K.; Eiken, Ola; Kölegård, Roger

    2015-01-01

    by the use of a human centrifuge would increase mean arterial pressure (MAP) more in tall than in short males in the seated position. In short (162-171cm, n=8) and tall (194-203cm, n=10) healthy males (18-41yr), brachial arterial pressure, heart rate (HR) and cardiac output were measured during +2G...... centrifugation, while they were seated upright with the legs kept horizontal (+2Gz). In a separate experiment, the same measurements were done with the subjects supine (+2Gx). During +2Gz MAP increased in the short (22±2 mmHg, P 

  10. Modeling study of seated reach envelopes based on spherical harmonics with consideration of the difficulty ratings.

    Science.gov (United States)

    Yu, Xiaozhi; Ren, Jindong; Zhang, Qian; Liu, Qun; Liu, Honghao

    2017-04-01

    Reach envelopes are very useful for the design and layout of controls. In building reach envelopes, one of the key problems is to represent the reach limits accurately and conveniently. Spherical harmonics are proved to be accurate and convenient method for fitting of the reach capability envelopes. However, extensive study are required on what components of spherical harmonics are needed in fitting the envelope surfaces. For applications in the vehicle industry, an inevitable issue is to construct reach limit surfaces with consideration of the seating positions of the drivers, and it is desirable to use population envelopes rather than individual envelopes. However, it is relatively inconvenient to acquire reach envelopes via a test considering the seating positions of the drivers. In addition, the acquired envelopes are usually unsuitable for use with other vehicle models because they are dependent on the current cab packaging parameters. Therefore, it is of great significance to construct reach envelopes for real vehicle conditions based on individual capability data considering seating positions. Moreover, traditional reach envelopes provide little information regarding the assessment of reach difficulty. The application of reach envelopes will improve design quality by providing difficulty-rating information about reach operations. In this paper, using the laboratory data of seated reach with consideration of the subjective difficulty ratings, the method of modeling reach envelopes is studied based on spherical harmonics. The surface fitting using spherical harmonics is conducted for circumstances both with and without seat adjustments. For use with adjustable seat, the seating position model is introduced to re-locate the test data. The surface fitting is conducted for both population and individual reach envelopes, as well as for boundary envelopes. Comparison of the envelopes of adjustable seat and the SAE J287 control reach envelope shows that the latter

  11. An ecophysiological and developmental perspective on variation in vessel diameter.

    Science.gov (United States)

    Hacke, Uwe G; Spicer, Rachel; Schreiber, Stefan G; Plavcová, Lenka

    2017-06-01

    Variation in xylem vessel diameter is one of the most important parameters when evaluating plant water relations. This review provides a synthesis of the ecophysiological implications of variation in lumen diameter together with a summary of our current understanding of vessel development and its endogenous regulation. We analyzed inter-specific variation of the mean hydraulic vessel diameter (D v ) across biomes, intra-specific variation of D v under natural and controlled conditions, and intra-plant variation. We found that the D v measured in young branches tends to stay below 30 µm in regions experiencing winter frost, whereas it is highly variable in the tropical rainforest. Within a plant, the widest vessels are often found in the trunk and in large roots; smaller diameters have been reported for leaves and small lateral roots. D v varies in response to environmental factors and is not only a function of plant size. Despite the wealth of data on vessel diameter variation, the regulation of diameter is poorly understood. Polar auxin transport through the vascular cambium is a key regulator linking foliar and xylem development. Limited evidence suggests that auxin transport is also a determinant of vessel diameter. The role of auxin in cell expansion and in establishing longitudinal continuity during secondary growth deserve further study. © 2016 John Wiley & Sons Ltd.

  12. Diameter dependent electron transfer kinetics in semiconductor-enzyme complexes.

    Science.gov (United States)

    Brown, Katherine A; Song, Qing; Mulder, David W; King, Paul W

    2014-10-28

    Excited state electron transfer (ET) is a fundamental step for the catalytic conversion of solar energy into chemical energy. To understand the properties controlling ET between photoexcited nanoparticles and catalysts, the ET kinetics were measured for solution-phase complexes of CdTe quantum dots and Clostridium acetobutylicum [FeFe]-hydrogenase I (CaI) using time-resolved photoluminescence spectroscopy. Over a 2.0-3.5 nm diameter range of CdTe nanoparticles, the observed ET rate (kET) was sensitive to CaI concentration. To account for diameter effects on CaI binding, a Langmuir isotherm and two geometric binding models were created to estimate maximal CaI affinities and coverages at saturating concentrations. Normalizing the ET kinetics to CaI surface coverage for each CdTe diameter led to k(ET) values that were insensitive to diameter, despite a decrease in the free energy for photoexcited ET (ΔGET) with increasing diameter. The turnover frequency (TOF) of CaI in CdTe-CaI complexes was measured at several molar ratios. Normalization for diameter-dependent changes in CaI coverage showed an increase in TOF with diameter. These results suggest that k(ET) and H2 production for CdTe-CaI complexes are not strictly controlled by ΔG(ET) and that other factors must be considered.

  13. The Relationship amongst Intervertebral Disc Vertical Diameter, Lateral Foramen Diameter and Nerve Root Impingement in Lumbar Vertebra

    Directory of Open Access Journals (Sweden)

    Yusof MI

    2018-03-01

    Full Text Available Introduction: The vertical diameter of the foramen is dependent upon the vertical diameter of the corresponding intervertebral disc. A decrease in disc vertical diameter has direct anatomic consequences to the foraminal diameter and area available for the nerve root passing through it. This study is to establish the relationship amongst the intervertebral disc vertical diameter, lateral foramen diameters and nerve root compression in the lumbar vertebra. Materials and Methods: Measurements of the study parameters were performed using sagittal MRI images. The parameters studied were: intervertebral disc vertical diameter (DVD, foraminal vertical diameter (FVD, foraminal transverse diameter (FTD and nerve root diameter (NRD of both sides. The relationship between the measured parameters were then analyzed. Results: A total of 62 MRI images were available for this study. Statistical analysis showed moderate to strong correlation between DVD and FVD at all the lumbar levels except at left L23 and L5S1 and right L3L4 and L4L5. Correlation between DVD and FTD were not significant at all lumbar levels. Regression analysis showed that a decrease of 1mm of DVD was associated with 1.3, 1.7, 3.3, 3.3 and 1.3mm reduction of FVD at L1L2, L2L3, L3L4, L4L5 and L5S1 respectively. Conclusion: Reduction of DVD was associated with reduction of FVD. However, FVD was relatively wide for the nerve root even with complete loss of DVD. FTD was much narrower than the FVD making it more likely to cause nerve root compression at the exit foramina. These anatomical details should be given consideration in treating patients with lateral canal stenosis.

  14. 75 FR 81224 - Availability of Recreational Diving, Oil and Gas Operations and Commercial Fishing Seats for the...

    Science.gov (United States)

    2010-12-27

    ... Recreational Diving, Oil and Gas Operations and Commercial Fishing Seats for the Flower Garden Banks National... Service (NOS), National Oceanic and Atmospheric Administration (NOAA), Department of Commerce DOC). ACTION... seats on the Flower Garden Banks National Marine Sanctuary Advisory Council: Recreational Diving, Oil...

  15. Optimizing protection for rear seat occupants : assessing booster performance with realistic belt geometry using the hybrid III 6YO ATD.

    Science.gov (United States)

    2011-11-01

    A series of sled tests was conducted to examine the performance of booster seats under belt geometries representing the range found in the rear seats of current vehicles. Twelve tests were performed with the standard 6YO Hybrid III ATD and 29 tests w...

  16. Interference of Different Types of Seats on Postural Control System during a Forward-Reaching Task in Individuals with Paraplegia

    Science.gov (United States)

    de Abreu, Daniela Cristina Carvalho; Takara, Kelly; Metring, Nathalia Lopes; Reis, Julia Guimaraes; Cliquet, Alberto, Jr.

    2012-01-01

    We aimed to evaluate the influence of different types of wheelchair seats on paraplegic individuals' postural control using a maximum anterior reaching test. Balance evaluations during 50, 75, and 90% of each individual's maximum reach in the forward direction using two different cushions on seat (one foam and one gel) and a no-cushion condition…

  17. 76 FR 64074 - Request for Applications for Vacant Seats on the Flower Garden Banks National Marine Sanctuary...

    Science.gov (United States)

    2011-10-17

    ... for Vacant Seats on the Flower Garden Banks National Marine Sanctuary Advisory Council AGENCY: Office... ONMS is seeking applications for the following six vacant seats on the Flower Garden Banks National.... ADDRESSES: Application kits may be obtained from Jennifer Morgan, NOAA- Flower Garden Banks National Marine...

  18. Explaining state-to-state differences in seat belt use : an analysis of socio-demographic variables.

    Science.gov (United States)

    2011-02-01

    "Despite the extensive evidence about the benefits of seat belt use, there is a great deal of variation in use within the US. For example, the national average for seat belt use in 2009 was 84 percent while the state-level averages ranged from 68 per...

  19. Calibration of the radiometric asteroid scale using occultation diameters

    Science.gov (United States)

    Brown, R. H.; Morrison, D.; Telesco, C. M.; Brunk, W. E.

    1982-10-01

    The paper describes a new approach to the calibration of the radiometric asteroid scale, which relies on recent accurate occultation measurements of the diameters of 2 Pallas (Wasserman et al., 1979) and 3 Juno (Millis et al., 1981), and the Voyager diameter of J4 Callisto, as well as IR photometry of these objects obtained with the NASA 3-m Infrared Telescope Facility. It is shown that this calibration is internally consistent to better than 5%, and probably has an absolute accuracy of + or - 5%. It is noted that a revision of the TRIAD radiometric diameters downward is required to bring them into agreement with the new calibration.

  20. Tangential supporting device for a horizontal tank of low thickness in relation to its diameter

    International Nuclear Information System (INIS)

    Marsault, J.J.; Semedard, J.C.; Peyrelongue, J.P.

    1983-01-01

    At each rounded end of the tank it includes a short annular stiffener coaxial to the end, of sufficient diameter to spread and reduce the stresses to a low figure, and an annular sheet metal rigid component placed in the same vertical area as the stiffener, forming a cradle for the stiffener over a portion of its perimeter, with a curve radius sufficiently greater than that of the stiffener to allow for differential radial expansion, and connected also to it by a radial and lateral connection. This device can be applied to hot liquid sodium storage tanks for breeder reactor energy generation power stations [fr

  1. Improved Design Basis for Laterally Loaded Large Diameter Pile

    DEFF Research Database (Denmark)

    Leth, Caspar Thrane

    in dry sand by use of centrifuge modelling and to compare the findings with the standard p-y curves. It has been chosen to apply piles with an embedment length of 6 to 10 times the diameter of the applied piles. The general static behaviour of monopiles in dry sand has based on centrifuge tests been...... initial response and a higher ultimate capacity. The initial stiffness of the soil-structure interaction measured in the centrifuge tests, equivalent to initial stiffness of p-y curves, shows a dependency of depth and diameter. Control issues in relation to cyclic tests have resulted in tests...... on the structure and the productivity of the turbine. Current design practice for monopiles are based on p-y curves developed for slender piles with a diameter of 0.6 m. The focus on the structure stiffness has entailed a significant research on the soil-structure interaction for large diameter monopiles...

  2. Porosity Assessment for Different Diameters of Coir Lignocellulosic Fibers

    Science.gov (United States)

    da Luz, Fernanda Santos; Paciornik, Sidnei; Monteiro, Sergio Neves; da Silva, Luiz Carlos; Tommasini, Flávio James; Candido, Verônica Scarpini

    2017-10-01

    The application of natural lignocellulosic fibers (LCFs) in engineering composites has increased interest in their properties and structural characteristics. In particular, the inherent porosity of an LCF markedly affects its density and the adhesion to polymer matrices. For the first time, both open and closed porosities of a natural LCF, for different diameter ranges, were assessed. Fibers extracted from the mesocarp of the coconut fruit were investigated by nondestructive methods of density measurements and x-ray microtomography (microCT). It was found that, for all diameter ranges, the closed porosity is significantly higher than the open porosity. The total porosity increases with diameter to around 60% for coir fibers with more than 503 μm in diameter. The amount and characteristics of these open and closed porosities were revealed by t test and Weibull statistics as well as by microCT.

  3. Synthesis of very small diameter silica nanofibers using sound waves.

    Science.gov (United States)

    Datskos, Panos; Chen, Jihua; Sharma, Jaswinder

    2014-07-14

    Silica nanofibers of an average diameter ≈30 nm and length ≈100 μm have been synthesized using an unprecedented strategy: sound waves. A new phenomenon, spinning off the nanofibers at silica rod tips, is also observed.

  4. Observations on placentome diameters in gestating West African ...

    African Journals Online (AJOL)

    ADEYEYE

    2015-09-09

    /10.4314/sokjvs.v13i3.4. Observations on placentome diameters in gestating West. African dwarf does experimentally infected with Trypanosoma brucei. OO Leigh. Department of Veterinary Surgery and Reproduction, ...

  5. Deriving muscle fiber diameter from recorded single fiber potential.

    Science.gov (United States)

    Zalewska, Ewa

    2017-12-01

    The aim of the study was to estimate muscle fiber diameters through analysis of single muscle fiber potentials (SFPs) recorded in the frontalis muscle of a healthy subject. Our previously developed analytical and graphic method to derive fiber diameter from the analysis of the negative peak duration and the amplitude of SFP, was applied to a sample of ten SFPs recorded in vivo. Muscle fiber diameters derived from the simulation method for the sample of frontalis muscle SFPs are consistent with anatomical data for this muscle. The results confirm the utility of proposed simulation method. Outlying data could be considered as the result of a contribution of other fibers to the potential recorded using an SFEMG electrode. Our graphic tool provides a rapid estimation of muscle fiber diameter. Copyright © 2017 Elsevier Masson SAS. All rights reserved.

  6. NEOWISE DIAMETERS AND ALBEDOS V1.0

    Data.gov (United States)

    National Aeronautics and Space Administration — This PDS data set represents a compilation of published diameters, optical albedos, near-infrared albedos, and beaming parameters for minor planets detected by...

  7. Heritability of retinal vessel diameters and blood pressure

    DEFF Research Database (Denmark)

    Taarnhøj, Nina C B B; Larsen, Michael; Sander, Birgit

    2006-01-01

    for CRVE, and 0.67 +/- 0.05 microm for AVR. No significant influence on artery or vein diameters was found for gender, smoking, body mass index (BMI), total cholesterol, fasting blood glucose, or 2-hour oral glucose tolerance test values. CONCLUSIONS: In healthy young adults with normal blood pressure......PURPOSE: To assess the relative influence of genetic and environmental effects on retinal vessel diameters and blood pressure in healthy adults, as well as the possible genetic connection between these two characteristics. METHODS: In 55 monozygotic and 50 dizygotic same-sex healthy twin pairs......%-80%) for CRAE, 83% (95% CI: 73%-89%) for CRVE, and 61% (95% CI: 44%-73%) for mean arterial blood pressure (MABP). Retinal artery diameter decreased with increasing age and increasing arterial blood pressure. Mean vessel diameters in the population were 165.8 +/- 14.9 microm for CRAE, 246.2 +/- 17.7 microm...

  8. Ultrasonic measurement of biparietal diameter and femur in foetal ...

    African Journals Online (AJOL)

    Our objective was to verify ultrasonic measurement of biparietal diameter and femur in foetal age determination in the second and third trimester of pregnancy. The prospective cross sectional ... (3) L'errur standard pour la longueur du femur était de 0.2552 contre 0.3009 pour l'estimation du diameter bi-pariétal. Les résultats ...

  9. Catalytic growth of carbon nanotubes with large inner diameters

    Directory of Open Access Journals (Sweden)

    WEI REN ZHONG

    2005-02-01

    Full Text Available Carbon nanotubes (2.4 g/g catalyst, with large inner diameters were successfully synthesized through pyrolysis of methane on a Ni–Cu–Al catalyst by adding sodium carbonate into the carbon nanotubes growth system. The inner diameter of the carbon nanotubes prepared by this method is about 20–60 nm, while their outer diameter is about 40–80 nm. Transmission electron microscopy and X-ray diffraction were employed to investigate the morphology and microstructures of the carbon nanotubes. The analyses showed that these carbon nanotubes have large inner diameters and good graphitization. The addition of sodium carbonate into the reaction system brings about a slight decrease in the methane conversion and the yield of carbon. The experimental results showed that sodium carbonate is a mildly toxic material which influenced the catalytic activity of the Ni–Cu–Al catalyst and resulted in the formation of carbon nanotubes with large inner diameters. The growth mechanism of the carbon nanotubes with large inner diameters is discussed in this paper.

  10. Wheelchair Seating Assessment and Intervention: A Comparison between Telerehabilitation and Face-to-Face Service

    Directory of Open Access Journals (Sweden)

    Ingrid G Barlow

    2009-09-01

    Full Text Available This study compared outcomes of wheelchair seating and positioning interventions provided by telerehabilitation (n=10 and face-to-face (n=20; 10 in each of two comparison groups, one urban and one rural. Comparison clients were matched to the telerehabilitation clients in age, diagnosis, and type of seating components received. Clients and referring therapists rated their satisfaction and identified if seating intervention goals were met. Clients recorded travel expenses incurred or saved, and all therapists recorded time spent providing service. Wait times and completion times were tracked. Clients seen by telerehabilitation had similar satisfaction ratings and were as likely to have their goals met as clients seen face-to-face; telerehabilitation clients saved travel costs. Rural referring therapists who used telerehabilitation spent more time in preparation and follow-up than the other groups. Clients assessed by telerehabilitation had shorter wait times for assessment than rural face-to-face clients, but their interventions took as long to complete. Keywords: Telerehabilitation, Telehealth, Videoconferencing, Wheelchair Seating, Outcomes, Rehabilitation

  11. Temporal behavior of deep-seated gravitational slope deformations: A review

    Czech Academy of Sciences Publication Activity Database

    Pánek, T.; Klimeš, Jan

    2016-01-01

    Roč. 156, MAY (2016), s. 14-38 ISSN 0012-8252 Institutional support: RVO:67985891 Keywords : deep-seated gravitational slope deformations * catastrophic slope failures * deformation rates * dating * monitoring Subject RIV: DE - Earth Magnetism, Geodesy, Geography Impact factor: 7.051, year: 2016

  12. Impact of Implementing a Primary Enforcement Seat Belt Law in Florida : A Case Study

    Science.gov (United States)

    2012-08-01

    On June 30, 2009, Florida implemented a primary seat belt law. The State was already engaged in a Rural : Demonstration Program (RDP) to increase belt usage in rural areas in the northern part of the State and participated : regularly in annual Click...

  13. Estimated medical cost savings in Utah by implementation of a primary seat belt law

    Science.gov (United States)

    2010-05-01

    This report examines 2007 hospital discharge data reporting cases where the external cause of injury to : a vehicle occupant was a motor vehicle crash to predict the estimated savings to Utah if a primary seat : belt law is implemented. The savings a...

  14. Estimated medical cost savings in Nevada by implementation of a primary seat belt law

    Science.gov (United States)

    2008-09-01

    This report examines 2007 hospital discharge data reporting cases where the external cause of injury to a vehicle occupant was a motor vehicle crash to predict the estimated savings to Nevada if a primary seat belt law is implemented. The savings are...

  15. Estimated medical cost savings in Rhode Island by implementation of a primary seat belt law

    Science.gov (United States)

    2008-09-01

    This report examines 2006 hospital discharge data reporting cases where the external cause of injury to a vehicle occupant was a motor vehicle crash to predict the estimated savings to Rhode Island if a primary seat belt law is implemented. The savin...

  16. Estimated medical cost savings in Massachusetts by implementation of a primary seat belt law

    Science.gov (United States)

    2008-12-01

    This report examines 2006 hospital discharge data reporting cases where the external cause of injury to a vehicle occupant was a motor vehicle crash to predict the estimated savings to Massachusetts if a primary seat belt law is implemented. The savi...

  17. Estimated medical cost savings in Vermont by implementation of a primary seat belt law

    Science.gov (United States)

    2008-09-01

    This report examines 2005 hospital discharge data reporting cases where the external cause of injury to a vehicle occupant was a motor vehicle crash to predict the estimated savings to the State of Vermont if a primary seat belt law is implemented. T...

  18. Making Every Seat Count: Space Management at Peak Times in a University Library

    Science.gov (United States)

    Breen, Michelle; Dundon, Mary; McCaffrey, Ciara

    2018-01-01

    This study explores the library equivalent of the "towels on deck chairs" phenomenon of students reserving library seats: the practice of leaving personal belongings unattended at a library study space for long periods of time, rendering the desk unavailable for use by others. It presents highly inefficient use of high value academic…

  19. Postural sway parameters in seated balancing; their reliability and relationship with balancing performance

    NARCIS (Netherlands)

    van Dieen, J.H.; Koppes, L.L.J.; Twisk, J.W.R.

    2010-01-01

    This study investigated a representative set of 39 parameters characterizing center of pressure movements (sway) in seated balancing, with the aims to determine test-retest reliability, to clarify the interrelations between these parameters, and to determine which parameters were related to balance

  20. Modelling flow and heat transfer around a seated human body by computational fluid dynamics

    DEFF Research Database (Denmark)

    Sørensen, Dan Nørtoft; Voigt, Lars Peter Kølgaard

    2003-01-01

    A database (http://www.ie.dtu.dk/manikin) containing a detailed representation of the surface geometry of a seated female human body was created from a surface scan of a thermal manikin (minus clothing and hair). The radiative heat transfer coefficient and the natural convection flow around...

  1. Determining the Relationship of Primary Seat Belt Laws to Minority Ticketing

    Science.gov (United States)

    2011-09-01

    Racial profiling is often raised as an issue when States change their seat belt law from secondary enforcement (i.e., stop only for some other violation) to primary enforcement (i.e., stop for an observed belt law violation alone). Thirteen States ma...

  2. Seatbelt paths of the pregnant women sitting in the rear seat of a motor vehicle

    Directory of Open Access Journals (Sweden)

    Masahito Hitosugi

    2017-12-01

    Conclusion: Our findings show that because of short height and late term of pregnancy with protrusion of the abdomen, the shoulder belt deviates to the right or left, avoiding the protruded uterus, and subsequently makes contact with the neck. Seatbelt systems for rear seats need to be developed to improve passenger safety, especially for pregnant women.

  3. The Role of Seat Belt in the Prevention of Fatalities and ...

    African Journals Online (AJOL)

    Background Road traffic crashes still remain a prominent cause of death worldwide but proper use of safety belts can prevent death in some of these accidents. The aim of this study was therefore to examine the role of seat beltuse I violation in Rivers State, Nigeria and to determine its relationship with fatality of road traffic ...

  4. Effect of realistic vehicle seats, cushion length, and lap belt geometry on child ATD kinematics.

    Science.gov (United States)

    2011-12-01

    This series of sled tests examined the effect of using real vehicle seats on child ATD performance. Cushion length was varied from production length of 450 mm to a shorter length of 350 mm. Lap belt geometry was set to rear, mid, and forward anchorag...

  5. Comfort, experience, physiology and car seat innovation : Theory, Design and Evaluation

    NARCIS (Netherlands)

    Franz, M.M.

    2010-01-01

    The development process of car seats is very complex and many factors have to be considered in the development, such as anthropometry, physiology, safety, design and comfort. A factor making it more complex is the fact that future cars should be more sustainable, making the need for weight reduction

  6. 76 FR 68428 - Availability of Seats for the Gray's Reef National Marine Sanctuary Advisory Council

    Science.gov (United States)

    2011-11-04

    ... serve 3-year terms, pursuant to the council's Charter. The applicant chosen for the citizen-at-large... the Gray's Reef National Marine Sanctuary Advisory Council AGENCY: Office of National Marine... applications for the following vacant seats on the Gray's Reef National Marine Sanctuary Advisory Council...

  7. 75 FR 66064 - Availability of Seats for Olympic Coast National Marine Sanctuary Advisory Council

    Science.gov (United States)

    2010-10-27

    ... Olympic Coast National Marine Sanctuary Advisory Council AGENCY: Office of National Marine Sanctuaries... applications for the following vacant seats on the Olympic Coast National Marine Sanctuary Advisory Council: Marine Business and Industry, and Citizen-at Large. Both a primary and alternate member will be selected...

  8. Active Prompting to Decrease Cell Phone Use and Increase Seat Belt Use while Driving

    Science.gov (United States)

    Clayton, Michael; Helms, Bridgett; Simpson, Cathy

    2006-01-01

    Automobile crashes are the leading cause of death for those aged 3 to 33, with 43,005 (118 per day) Americans killed in 2002 alone. Seat belt use reduces the risk of serious injury in an accident, and refraining from using a cell phone while driving reduces the risk of an accident. Cell phone use while driving increases accident rates, and leads…

  9. Shoulder Pain in Cases of Spinal Injury: Influence of the Position of the Wheelchair Seat

    Science.gov (United States)

    Giner-Pascual, Manuel; Alcanyis-Alberola, Modesto; Millan Gonzalez, Luis; Aguilar-Rodriguez, Marta; Querol, Felipe

    2011-01-01

    The objective of this study was to determine the relationship between shoulder pain and the position of the seat of a wheelchair relative to the ground and to determine the relationship between shoulder pain and structural damage. A transversal study of a patient cohort of 140 patients with grade A and B spinal cord injuries below the T1 vertebra,…

  10. Application of a bus seat buffer to mitigate frontal crash effects

    Science.gov (United States)

    Stanisławek, Sebastian; Dziewulski, Paweł; Sławiński, Grzegorz

    2018-01-01

    The paper considers the problem of coach occupant safety during crash events. The authors present a simple low-cost seat buffer concept which may mitigate the effects of frontal impact. The method of computer simulation was chosen to solve the problem efficiently. The Finite Element Method (FEM) implemented in the LS-DYNA commercial code was used. The testing procedure was based on European Commission regulations, under which vehicles move at a defined speed. Simulations have shown that seat occupants suffer serious trauma during a crash, with the head experiencing relatively high acceleration, thus resulting in an HIC36 of 1490. The installation of a protective buffer mounted on the upper part of the seat reduced the HIC36 to only 510. However, in its current form it does not meet the requirements of the regulations. Further modifications to the overlay shape and structure are essential in order to better improve the deceleration of passengers' bodies. Moreover, a detailed model of seats and their anchorage should be taken into account. A more flexible structure should provide more positive and more accurate results.

  11. 75 FR 66686 - Federal Motor Vehicle Safety Standards; Seat Belt Assembly Anchorages, School Bus Passenger...

    Science.gov (United States)

    2010-10-29

    ... Anchorages, School Bus Passenger Seating and Crash Protection AGENCY: National Highway Traffic Safety... published on October 21, 2008, which upgraded NHTSA's school bus passenger crash protection requirements.... We make clearer the procedure specifying how we will measure the height of school bus passenger torso...

  12. Searching the seat of the soul in Ancient Greek and Byzantine medical literature.

    Science.gov (United States)

    Lykouras, Eleftherios; Poulakou-Rebelakou, Effie; Ploumpidis, Demetrios N

    2010-12-01

    The objective of this paper was to examine the ancient and medieval concepts about the seat of the mental functions, as exposed in Greek texts from Antiquity to Byzantine times. The review of the philosophical and medical literature from the original ancient Greek language from the Homeric epics to the Holy Fathers of Christianity, as the problem of the seat of the soul remained without a certain answer through the centuries. Primitive concepts attributed great significance to the soul and dictated cannibal behaviours for the possession and eating of the defeated enemy's heart. Mental functions, such as thinking, feeling and mainly those related to affective manifestations, were attributed to the heart and to some other internal organs (liver, diaphragm) from the times of Greek mythology. Philosophy and empirical medicine had underestimated the brain probably because it is a 'silent' organ, contrary to the palpitating heart, with its obvious participations in the emotional reactions. The role of the brain as the mental organ and the seat of emotions has been gradually recognized. The permanent question of the seat of the soul had been for many centuries a critical dispute and the contribution of Greek philosophical and medical thought was decisive for the contemporary transformation of the whole concept.

  13. Reliability and validity of a talent identification test battery for seated and standing Paralympic throws.

    Science.gov (United States)

    Spathis, Jemima Grace; Connick, Mark James; Beckman, Emma Maree; Newcombe, Peter Anthony; Tweedy, Sean Michael

    2015-01-01

    Paralympic throwing events for athletes with physical impairments comprise seated and standing javelin, shot put, discus and seated club throwing. Identification of talented throwers would enable prediction of future success and promote participation; however, a valid and reliable talent identification battery for Paralympic throwing has not been reported. This study evaluates the reliability and validity of a talent identification battery for Paralympic throws. Participants were non-disabled so that impairment would not confound analyses, and results would provide an indication of normative performance. Twenty-eight non-disabled participants (13 M; 15 F) aged 23.6 years (±5.44) performed five kinematically distinct criterion throws (three seated, two standing) and nine talent identification tests (three anthropometric, six motor); 23 were tested a second time to evaluate test-retest reliability. Talent identification test-retest reliability was evaluated using Intra-class Correlation Coefficient (ICC) and Bland-Altman plots (Limits of Agreement). Spearman's correlation assessed strength of association between criterion throws and talent identification tests. Reliability was generally acceptable (mean ICC = 0.89), but two seated talent identification tests require more extensive familiarisation. Correlation strength (mean rs = 0.76) indicated that the talent identification tests can be used to validly identify individuals with competitively advantageous attributes for each of the five kinematically distinct throwing activities. Results facilitate further research in this understudied area.

  14. Determining the Effectiveness of Alternative Seating Systems for Students with Attention Difficulties: A Systematic Review

    Science.gov (United States)

    Gochenour, Brittany; Poskey, Gail A.

    2017-01-01

    A student's ability to attend in the classroom is an important factor in determining academic success. This systematic review examined the effects of an alternative seating system on improving attention in students with attention difficulties. Databases searched included CINAHL, Medline, PsycINFO, OTSeeker, Cochrane Library, and Google Scholar.…

  15. 75 FR 57444 - Extension of Application Period for Seats for the Stellwagen Bank National Marine Sanctuary...

    Science.gov (United States)

    2010-09-21

    ... played a vital role in advising the Sanctuary and NOAA on critical issues. The Stellwagen Bank National.... Renowned for its scenic beauty and remarkable productivity, the sanctuary supports a rich diversity of... Period for Seats for the Stellwagen Bank National Marine Sanctuary Advisory Council AGENCY: Office of...

  16. 76 FR 23793 - Extension of Application Period for Seats for the Stellwagen Bank National Marine Sanctuary...

    Science.gov (United States)

    2011-04-28

    ... establishment, the Council has played a vital role in advising NOAA on critical issues and is currently focused... beauty and remarkable productivity, the sanctuary supports a rich diversity of marine life including 22... Period for Seats for the Stellwagen Bank National Marine Sanctuary Advisory Council AGENCY: Office of...

  17. Measurement of the functional impact of adaptive seating technology in children with cerebral palsy

    NARCIS (Netherlands)

    Ryan, S.E.

    2009-01-01

    Many young children with cerebral palsy have motor impairments that affect their ability to sit and do activities unsupported. They often rely on special adaptive seating devices for postural control and stability. Healthcare practitioners generally accept that these products improve functioning in

  18. 78 FR 2957 - Availability of Seats for the Flower Garden Banks National Marine Sanctuary Advisory Council

    Science.gov (United States)

    2013-01-15

    ... the Flower Garden Banks National Marine Sanctuary Advisory Council AGENCY: Office of National Marine... applications for the following vacant seats on the Flower Garden Banks National Marine Sanctuary Advisory..., NOAA--Flower Garden Banks National Marine Sanctuary, 4700 Avenue U, Bldg. 216, Galveston, TX 77551 or...

  19. Nigeria's bid for inclusion in the permanent seat of the security ...

    African Journals Online (AJOL)

    The paper also investigates the elements that undermine Nigeria's bid for inclusion in the permanent seat of the Security Council. The paper adopts content analysis in its methodology, with particular focus on secondary data as source of information.. The paper finds out that Nigeria, at present, cannot occupy a permanent ...

  20. 78 FR 11821 - Availability of Seats for the Thunder Bay National Marine Sanctuary Advisory Council

    Science.gov (United States)

    2013-02-20

    ...): Recreation, Business/Economic Development, Tourism (primary seat only), Diving (alternate only), Higher... facets of the sanctuary community, including education, research, fishing, diving, tourism, economic... role in council meetings as well as assist in carrying out many volunteer assignments throughout the...

  1. 75 FR 57441 - Availability of Seats for the Hawaiian Islands Humpback Whale National Marine Sanctuary Advisory...

    Science.gov (United States)

    2010-09-21

    ... seat for which they are applying; community and professional affiliations; philosophy regarding the... management agencies, user groups, researchers, educators, policy makers, and other various groups that help... helping to develop policies and program goals, and to identify education, outreach, research, long-term...

  2. Seat belt syndrome: Delayed or missed intestinal injuries, a case report and review of literature

    Directory of Open Access Journals (Sweden)

    Labib Al-Ozaibi

    2016-01-01

    Conclusion: Clinical signs of intestinal injuries might not be obvious on presentation. In the presence of seat belt sign the possibility of bowl injury must be suspected. Admit the patient for observation even if no clinical or radiological findings are present at presentation.

  3. 41 CFR 301-10.124 - What are coach-class Seating Upgrade Programs?

    Science.gov (United States)

    2010-07-01

    ... traveler's personal choice and therefore is at the traveler's personal expense. An agency travel... Travel Regulation System TEMPORARY DUTY (TDY) TRAVEL ALLOWANCES ALLOWABLE TRAVEL EXPENSES 10... reimburse the additional seat choice fee, according to internal agency policy. [FTR Amdt. 2009-06, 74 FR...

  4. Users in the Driver's Seat: A New Approach to Classifying Teaching Methods in a University Repository

    NARCIS (Netherlands)

    Neumann, Susanne; Oberhuemer, Petra; Koper, Rob

    2009-01-01

    Neumann, S., Oberhuemer, P., & Koper, R. (2009). Users in the Driver's Seat: A New Approach to Classifying Teaching Methods in a University Repository. In U. Cress, V. Dimitrova & M. Specht (Eds.), Learning in the Synergy of Multiple Disciplines. Proceedings of the Fourth European Conference on

  5. Using haptic feedback to increase seat belt use of service vehicle drivers.

    Science.gov (United States)

    2011-01-01

    This study pilot-tested a new application of a technology-based intervention to increase seat belt use. The technology was based on a : contingency in which unbelted drivers experienced sustained haptic feedback to the gas pedal when they exceeded 25...

  6. 77 FR 1618 - Special Conditions: The Boeing Company, Model 767-300; Seats With Inflatable Lapbelts

    Science.gov (United States)

    2012-01-11

    ... successful completion of dynamic tests or by rational analysis based on dynamic tests of a similar type seat... unable to develop a fabric that would meet the inflation requirements for the bag and the flammability requirements of part I, paragraph (a)(1)(ii), of appendix F to part 25. The fabrics that were developed that...

  7. 77 FR 66073 - Availability of Seats for the Monitor National Marine Sanctuary Advisory Council

    Science.gov (United States)

    2012-11-01

    ...: Recreational/Commercial Fishing and Education seats. Applicants are chosen based upon their particular.... It is one of 13 sanctuaries and protects the wreck of the famed Civil War ironclad, USS Monitor, best... interests and stakeholders, including: Citizen-at-Large, Conservation, Economic Development, Education...

  8. Seat Capacity Selection for an Advanced Short-Haul Aircraft Design

    Science.gov (United States)

    Marien, Ty V.

    2016-01-01

    A study was performed to determine the target seat capacity for a proposed advanced short-haul aircraft concept projected to enter the fleet by 2030. This analysis projected the potential demand in the U.S. for a short-haul aircraft using a transportation theory approach, rather than selecting a target seat capacity based on recent industry trends or current market demand. A transportation systems model was used to create a point-to-point network of short-haul trips and then predict the number of annual origin-destination trips on this network. Aircraft of varying seat capacities were used to meet the demand on this network, assuming a single aircraft type for the entire short-haul fleet. For each aircraft size, the ticket revenue and operational costs were used to calculate a total market profitability metric for all feasible flights. The different aircraft sizes were compared, based on this market profitability metric and also the total number of annual round trips and markets served. Sensitivity studies were also performed to determine the effect of changing the aircraft cruise speed and maximum trip length. Using this analysis, the advanced short-haul aircraft design team was able to select a target seat capacity for their design.

  9. Evaluation of a rural demonstration program to increase seat belt use in the Great Lakes Region.

    Science.gov (United States)

    2009-03-01

    Six States in the Great Lakes Region (Region 5) participated in a Rural Demonstration Program to increase seat belt : use in rural areas and among high-risk occupants, such as young males and occupants of pickup trucks. These : efforts, which include...

  10. The Role of Seat Belt in the Prevention of Fatalities and ...

    African Journals Online (AJOL)

    TNHJOURNALPH

    speed and less drunk driving amongst others[36-38].Also, there was no significant relationship between number of seat belt violations and other four outcomes (no. of total accidents, injured, death, total casualties) in this study between 2009 and 2012. Recent reviews of the relative efficacy of primary versus secondary ...

  11. Pattern of Seat Belt and Mobile Phone use while driving in an Urban ...

    African Journals Online (AJOL)

    Objective: Human error contributes significantly to the occurrence of road traffic accidents (RTAs) and their attendant morbidity and mortality. While driving, distractions such as the use of mobile phones and poor compliance with the use of seat belts play different roles in the occurrence of RTAs and possible injuries arising ...

  12. Variation between seated and standing/walking postures among male and female call centre operators

    Directory of Open Access Journals (Sweden)

    Toomingas Allan

    2012-03-01

    Full Text Available Abstract Background The dose and time-pattern of sitting has been suggested in public health research to be an important determinant of risk for developing a number of diseases, including cardiovascular disorders and diabetes. The aim of the present study was to assess the time-pattern of seated and standing/walking postures amongst male and female call centre operators, on the basis of whole-shift posture recordings, analysed and described by a number of novel variables describing posture variation. Methods Seated vs. standing/walking was recorded using dichotomous inclinometers throughout an entire work shift for 43 male and 97 female call centre operators at 16 call centres. Data were analysed using an extensive set of variables describing occurrence of and switches between seated and standing/walking, posture similarity across the day, and compliance with standard recommendations for computer work. Results The majority of the operators, both male and female, spent more than 80% of the shift in a seated posture with an average of 10.4 switches/hour between seated and standing/walking or vice versa. Females spent, on average, 11% of the day in periods of sustained sitting longer than 1 hour; males 4.6% (p = 0.013. Only 38% and 11% of the operators complied with standard recommendations of getting an uninterrupted break from seated posture of at least 5 or 10 minutes, respectively, within each hour of work. Two thirds of all investigated variables showed coefficients of variation between subjects above 0.5. Since work tasks and contractual break schedules were observed to be essentially similar across operators and across days, this indicates that sedentary behaviours differed substantially between individuals. Conclusions The extensive occurrence of uninterrupted seated work indicates that efforts should be made at call centres - and probably in other settings in the office sector - to introduce more physical variation in terms of standing

  13. Metal-metal-hofteproteser

    DEFF Research Database (Denmark)

    Ulrich, Michael; Overgaard, Søren; Penny, Jeannette

    2014-01-01

    In Denmark 4,456 metal-on-metal (MoM) hip prostheses have been implanted. Evidence demonstrates that some patients develope adverse biological reactions causing failures of MoM hip arthroplasty. Some reactions might be systemic. Failure rates are associated with the type and the design of the Mo...

  14. Energy absorption capability of foam-based composite materials and their applications as seat cushions in aircraft crashworthiness

    Science.gov (United States)

    Kh. Beheshti, Hamid

    This study is focusing on the application of foam materials in aviation. These materials are being used for acoustic purposes, as padding in the finished interior panels of the aircraft, and as seat cushions. Foams are mostly used in seating applications. Since seat cushion is directly interacting with the body of occupant, it has to be ergonomically comfortable beside of absorbing the energy during the impact. All the seats and seat cushions have to pass regulations defined by Federal Aviation Administration (FAA). In fact, all airplane companies are required to certify the subcomponents of aircrafts before installing them on the main structure, fuselage. Current Federal Aviation Administration Regulations require a dynamic sled test of the entire seat system for certifying the seat cushions. This dynamic testing is required also for replacing the deteriorated cushions with new cushions. This involves a costly and time-consuming certification process. AGATE group has suggested a procedure based on quasi-static testing in order to certify new seat cushions without conducting full-scale dynamic sled testing. AGATE subcomponent methodology involves static tests of the energy-absorbing foam cushions and design validation by conducting a full-scale dynamic seat test. Microscopic and macroscopic studies are necessary to provide a complete understanding about performance of foams during the crash. Much investigation has been done by different sources to obtain the reliable modeling in terms of demonstration of mechanical behavior of foams. However, rate sensitivity of foams needs more attention. A mathematical hybrid dynamic model for the cushion underneath of the human body will be taken into consideration in this research. Analytical and finite element codes such as MADYMO and LS-DYNA codes have the potential to greatly speed up the crashworthy design process, to help certify seats and aircraft to dynamic crash loads, to predict seat and occupant response to impact

  15. TU-H-CAMPUS-TeP1-02: Seated Treatment: Setup Uncertainty Comparable to Supine

    Energy Technology Data Exchange (ETDEWEB)

    McCarroll, R [UT MD Anderson Cancer Center, Houston, TX (United States); UT Health Science Center, Graduate School of Biomedical Sciences, Houston, TX (United States); Beadle, B; Fullen, D; Balter, P; Followill, D; Stingo, F; Yang, J; Court, L [UT MD Anderson Cancer Center, Houston, TX (United States)

    2016-06-15

    Purpose: For some head and neck patients, positioning in the supine position is not well tolerated. For these patients, treatment in a seated position would be preferred. We have evaluated inter- and intra- fraction uncertainty of patient set-up in a novel treatment chair which is compatible with modern linac designs. Methods: Five head-and-neck cancer patients were positioned in the chair, fitted with immobilization devices, and imaged with orthogonal X-rays. The couch (with chair attached) was rotated to simulate delivery (without actual treatment), another set of images were acquired, providing a measure of intra-fraction displacement. The patient then got off of and back onto the chair and the process was repeated, thus providing a measure of inter-fraction set-up uncertainty. Six sub-regions in the head-and-neck were rigidly registered to evaluate local intra- and interfraction displacement. Image guidance was simulated by first registering one sub-region; the residual displacement of other sub-regions was then measured. Additionally, a patient questionnaire was administered to evaluate tolerance of the seated position. Results: The chair design is such that all advantages of couch motions may be utilized. Average inter- and intrafraction displacements of all sub-regions in the seated position were less than 2 and 3 mm, respectively. When image guidance was simulated, interfraction displacements were reduced by an average of 4 mm, providing comparable setup to the supine position. The enrolled patients, who had no indication for a seated treatment position, reported no preference for the seated or the supine position. Conclusion: The novel chair design provides acceptable inter- and intra-fraction displacement, with reproducibility similar to that observed for patients in the supine position. Such a chair will be utilized for patients who cannot tolerate the supine position and use with CBCT images for planning, in a fixed-beam linac system, and for other

  16. Combination ergotamine and caffeine improves seated blood pressure and presyncopal symptoms in autonomic failure

    Directory of Open Access Journals (Sweden)

    Amy C Arnold

    2014-07-01

    Full Text Available Severely affected patients with autonomic failure require pressor agents to counteract the blood pressure fall and improve presyncopal symptoms upon standing. Previous studies suggest that combination ergotamine and caffeine may be effective in the treatment of autonomic failure, but the efficacy of this drug has not been evaluated in controlled trials. Therefore, we compared the effects of ergotamine/caffeine on seated blood pressure and orthostatic tolerance and symptoms in 12 primary autonomic failure patients without history of coronary artery disease. Patients were randomized to receive a single oral dose of placebo, midodrine (5-10 mg, or ergotamine and caffeine (1 mg and 100 mg, respectively in a single-blind, crossover study. Blood pressure was measured while patients were seated and after standing for up to 10 minutes, at baseline and at 1 hour post-drug. Ergotamine/caffeine increased seated systolic blood pressure, the primary outcome, compared with placebo (131±19 and 95±12 mmHg, respectively, at 1 hour post-drug; p=0.003 for time effect. Midodrine also significantly increased seated systolic blood pressure (121±19 mmHg at 1 hour post-drug; p=0.015 for time effect versus placebo, but this effect was not different from ergotamine/caffeine (p=0.621. There was no significant effect of either medication on orthostatic tolerance; however, ergotamine/caffeine improved presyncopal symptoms (p=0.034. These findings suggest that combination ergotamine and caffeine elicits a seated pressor response that is similar in magnitude to midodrine, and improves symptoms in autonomic failure. Thus, ergotamine/caffeine could be used as an alternate treatment for autonomic failure, in carefully selected patients without comorbid coronary artery disease.

  17. Development of a multi-body nonlinear model for a seat-occupant system

    Science.gov (United States)

    Azizi, Yousof

    A car seat is an important component of today's cars, which directly affects ride comfort experienced by occupants. Currently, the process of ride comfort evaluation is subjective. Alternatively, the ride comfort can be evaluated by a series of objective metrics in the dynamic response of the occupant. From previous studies it is well known that the dynamic behavior of a seat-occupant system is greatly affected by soft nonlinear viscoelastic materials used in the seat cushion. Therefore, in this research, especial attention was given to efficiently modeling the behavior of seat cushion. In the first part of this research, a phenomenological nonlinear viscoelastic foam model was proposed and its ability to capture uniaxial behavior of foam was investigated. The model is based on the assumption that the total stress can be decomposed into the sum of a nonlinear elastic component, modeled by a higher order polynomial of strain, and a nonlinear hereditary type viscoelastic component. System identification procedures were developed to estimate the model parameters using uniaxial cyclic compression data from experiments conducted at different rates on two types of low density polyurethane foams and three types of high density CONFOR foams. The performance of the proposed model was compared to that of other traditional continuum models. For each foam type, it was observed that lower order models are sufficient to describe the uniaxial behavior of the foam compressed at different rates. Although, the estimated model parameters were functions of the input strain rate. Alternatively, higher order comprehensive models, with strain independent parameters, were estimated as well. The estimated comprehensive model predicts foam responses under different compression rates. Also, a methodology was proposed to predict the stress-response of a layered foam system using the estimated models of each foam in the layers. Next, the estimated foam model was incorporated into a single

  18. Failure Diameter of PBX 9502: Simulations with the SURFplus model

    Energy Technology Data Exchange (ETDEWEB)

    Menikoff, Ralph [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2017-07-03

    SURFplus is a reactive burn model for high explosives aimed at modelling shock initiation and propagation of detonation waves. It utilizes the SURF model for the fast hot-spot reaction plus a slow reaction for the energy released by carbon clustering. A feature of the SURF model is that there is a partially decoupling between burn rate parameters and detonation wave properties. Previously, parameters for PBX 9502 that control shock ini- tiation had been calibrated to Pop plot data (distance-of-run to detonation as a function of shock pressure initiating the detonation). Here burn rate parameters for the high pres- sure regime are adjusted to t the failure diameter and the limiting detonation speed just above the failure diameter. Simulated results are shown for an uncon ned rate stick when the 9502 diameter is slightly above and slightly below the failure diameter. Just above the failure diameter, in the rest frame of the detonation wave, the front is sonic at the PBX/air interface. As a consequence, the lead shock in the neighborhood of the interface is supported by the detonation pressure in the interior of the explosive rather than the reaction immediately behind the front. In the interior, the sonic point occurs near the end of the fast hot-spot reaction. Consequently, the slow carbon clustering reaction can not a ect the failure diameter. Below the failure diameter, the radial extent of the detonation front decreases starting from the PBX/air interface. That is, the failure starts at the PBX boundary and propagates inward to the axis of the rate stick.

  19. Diameter measurements of polystyrene particles with atomic force microscopy

    Science.gov (United States)

    Garnaes, J.

    2011-09-01

    The size of (nano) particles is a key parameter used in controlling their function. The particle size is also important in order to understand their physical and chemical properties and regulate their number in health and safety issues. In this work, the geometric diameters of polystyrene spheres of nominal diameter 100 nm are measured using atomic force microscopy. The measurements are based on the apex height and on the average distance between neighbouring spheres when they form a close-packed monolayer on a flat mica substrate. The most important influence parameters for the determination of the geometric diameter are the lateral air gaps and deformation of the spheres. The lateral air gaps are caused by significant size variations of the individual spheres, and a correction is calculated based on the simulation of packing of spheres. The deformation of the spheres is caused mainly by capillary forces acting when they are in contact with each other or with the mica substrate. Based on calculated capillary forces and the literature values of the elastic properties of the polystyrene and mica, the deformation is estimated to be 2 nm with a standard uncertainty of 2 nm. The geometric diameter of the polystyrene spheres was measured with a combined standard uncertainty of ≈3 nm. The measured vertical diameter of 92.3 nm and the certified mobility equivalent diameter measured by differential mobility analysis (DMA) are marginally consistent at a confidence level of 95%. However, the measured lateral geometric diameter was 98.9 nm and is in good agreement with DMA.

  20. Metallated metal-organic frameworks

    Energy Technology Data Exchange (ETDEWEB)

    Bury, Wojciech; Farha, Omar K.; Hupp, Joseph T.; Mondloch, Joseph E.

    2017-02-07

    Porous metal-organic frameworks (MOFs) and metallated porous MOFs are provided. Also provided are methods of metallating porous MOFs using atomic layer deposition and methods of using the metallated MOFs as catalysts and in remediation applications.

  1. Metallated metal-organic frameworks

    Energy Technology Data Exchange (ETDEWEB)

    Bury, Wojciech; Farha, Omar K.; Hupp, Joseph T.; Mondloch, Joseph E.

    2017-08-22

    Porous metal-organic frameworks (MOFs) and metallated porous MOFs are provided. Also provided are methods of metallating porous MOFs using atomic layer deposition and methods of using the metallated MOFs as catalysts and in remediation applications.

  2. Polyol Synthesis of Silver Nanowires by Heterogeneous Nucleation and Mechanistic Aspects Influencing its Length and Diameter

    Science.gov (United States)

    Schuette, Waynie Mark

    Various additives are employed in the polyol synthesis of silver nanowires (Ag NWs), which are typically halide salts such as NaCl. A variety of mechanistic roles have been suggested for these additives. My research showed that the early addition of NaCl in the polyol synthesis of Ag NWs from AgNO3 in ethylene glycol results in the rapid formation of AgCl nanocubes, which induce the heterogeneous nucleation of metallic Ag upon their surfaces. Ag NWs subsequently grow from these nucleation sites. The conclusions are supported by studies using ex-situ generated AgCl nanocubes. Additionally, the final mean silver nanowire diameter is found to be independent of the size of the heterogeneous nucleant, showing that the diameter is not significantly influenced by the nucleation event. Kinetics studies determine that nanowire diameter, length, and aspect ratio grow in parallel to one another and with the extent of the Ag+ reduction reaction, demonstrating that growth is reduction-rate limited. The results are interpreted to support nanowire growth by a surface-catalyzed reduction process occurring on all nanowire surfaces, and to exclude nanoparticle aggregation or Ostwald ripening as primary components of the growth mechanism.

  3. Temperature control in large-internal-diameter scaffolded monolithic columns operated at ultra-high pressures.

    Science.gov (United States)

    Vonk, Rudy J; Aalbers, Tom; Eeltink, Sebastiaan; Schoenmakers, Peter J

    2015-07-03

    Scaffolding makes it feasible to create organic-polymer monoliths in large confinements, such as wide-bore columns. By creating the scaffold from a metal good heat conductivity inside the column is obtained, which renders the relatively large columns (comparable with 4.6 mm i.d.) suitable for application under ultra-high-pressure LC conditions. It was anticipated that the metal scaffold would allow accurate control of the temperature within the columns, but the temperature profiles within the columns could not be characterized using the previously available small-internal-diameter scaffolded columns. In the current study the internal diameter of the scaffolded columns was increased up to square conduits of 4×4 mm. Prior to the formation of the stationary phase the heating efficiency in the empty scaffolded conduits was addressed. The performance of stationary phases created in the large scaffolds was investigated using the kinetic performance approach and the results were compared to those of the previous studies. Finally, scaffolded columns were tested under ultra-high-pressure LC conditions, where good temperature control is essential. Copyright © 2015 Elsevier B.V. All rights reserved.

  4. The influence of chair seat height on the performance of community-dwelling older adults' 30-second chair stand test.

    Science.gov (United States)

    Kuo, Yi-Liang

    2013-06-01

    Although chair seat height affects the performance of sit-to-stand movement, no previous study has examined the influence of chair seat height on the 30-second chair stand test (CST). Fifty-five community-dwelling older adults (age 70.0 ± 6.3 years) performed the test from the standard height of 43 cm and then from five randomly ordered seat heights from 80 to 120 % of each participant's lower leg length. Chair seat height significantly influences the performance of community-dwelling older adults' 30-s CST (F = 57.50, p  0.95) and between the standard and 90 % conditions (p = 0.353). When comparing the scores between the randomly ordered chair seat heights, all comparisons were significantly different (p Chair seat height's relation to the lower leg length should be considered when interpreting 30-s CST scores. Additionally, it is necessary to optimize the chair seat height when using the 30-s CST as an outcome measure for exercise intervention or to screen for people with weaker lower extremities.

  5. On the performance of small diameter gas cyclones

    International Nuclear Information System (INIS)

    Halasz, Marcos Roberto Teixeira

    2002-02-01

    Small diameter cyclones represent a potential alternative for the removal of small diameter particles from gaseous mixtures as well as the environmental control of their emission. In order to establish feasible configurations of a small diameter cyclone applied in the separation of solid particles dispersed in a gas and considering a large quantify of experimental data in literature, neural networks were used to estimate the equipment grade efficiency and pressure drop. In order to evaluate a performance of many small diameters configurations and analysis was carried of parametrical sensibility which determines the most important variables on separation efficiency determination. A set of experimental runs was carried out in a lab-scale mini-cyclone in order to obtain the separation efficiency and pressure drop for different configurations, and evaluate the feasibility of coupling a post-cyclone device to improve the equipment overall performance. The cyclones used presented diameters of 0.03 and 0.05 m and the remaining dimensions varied proportionally about those found in Stairmand high-efficiency cyclones. Experimental separation efficiencies up to 99% were obtained in this work. These results confirm the feasibility of the experimental set-up configuration proposed. (author)

  6. Memory, emotion, and pupil diameter: Repetition of natural scenes.

    Science.gov (United States)

    Bradley, Margaret M; Lang, Peter J

    2015-09-01

    Recent studies have suggested that pupil diameter, like the "old-new" ERP, may be a measure of memory. Because the amplitude of the old-new ERP is enhanced for items encoded in the context of repetitions that are distributed (spaced), compared to massed (contiguous), we investigated whether pupil diameter is similarly sensitive to repetition. Emotional and neutral pictures of natural scenes were viewed once or repeated with massed (contiguous) or distributed (spaced) repetition during incidental free viewing and then tested on an explicit recognition test. Although an old-new difference in pupil diameter was found during successful recognition, pupil diameter was not enhanced for distributed, compared to massed, repetitions during either recognition or initial free viewing. Moreover, whereas a significant old-new difference was found for erotic scenes that had been seen only once during encoding, this difference was absent when erotic scenes were repeated. Taken together, the data suggest that pupil diameter is not a straightforward index of prior occurrence for natural scenes. © 2015 Society for Psychophysiological Research.

  7. Parametric Probability Distribution Functions for Axon Diameters of Corpus Callosum

    Directory of Open Access Journals (Sweden)

    Farshid eSepehrband

    2016-05-01

    Full Text Available Axon diameter is an important neuroanatomical characteristic of the nervous system that alters in the course of neurological disorders such as multiple sclerosis. Axon diameters vary, even within a fiber bundle, and are not normally distributed. An accurate distribution function is therefore beneficial, either to describe axon diameters that are obtained from a direct measurement technique (e.g., microscopy, or to infer them indirectly (e.g., using diffusion-weighted MRI. The gamma distribution is a common choice for this purpose (particularly for the inferential approach because it resembles the distribution profile of measured axon diameters which has been consistently shown to be non-negative and right-skewed. In this study we compared a wide range of parametric probability distribution functions against empirical data obtained from electron microscopy images. We observed that the gamma distribution fails to accurately describe the main characteristics of the axon diameter distribution, such as location and scale of the mode and the profile of distribution tails. We also found that the generalized extreme value distribution consistently fitted the measured distribution better than other distribution functions. This suggests that there may be distinct subpopulations of axons in the corpus callosum, each with their own distribution profiles. In addition, we observed that several other distributions outperformed the gamma distribution, yet had the same number of unknown parameters; these were the inverse Gaussian, log normal, log logistic and Birnbaum-Saunders distributions.

  8. Characteristics of two-phase flows in large diameter channels

    Energy Technology Data Exchange (ETDEWEB)

    Schlegel, J.P., E-mail: schlegelj@mst.edu [Department of Mining and Nuclear Engineering, Missouri University of Science and Technology, 301 W 14th St., Rolla, MO 65401 (United States); Hibiki, T.; Ishii, M. [School of Nuclear Engineering, Purdue University, 400 Central Dr., West Lafayette, IN 47907 (United States)

    2016-12-15

    Two-phase flows in large diameter channels have a great deal of importance in a wide variety of industrial applications. Nuclear systems, petroleum refineries, and chemical processes make extensive use of larger systems. Flows in such channels have very different properties from flows in smaller channels which are typically used in experimental research. In this paper, the various differences between flows in large and small channels are highlighted using the results of previous experimental and analytical research. This review is followed by a review of recent experiments in and model development for flows in large diameter channels performed by the authors. The topics of these research efforts range from void fraction and interfacial area concentration measurement to flow regime identification and modeling, drift-flux modeling for high void fraction conditions, and evaluation of interfacial area transport models for large diameter channels.

  9. Axon diameter mapping in crossing fibers with diffusion MRI

    DEFF Research Database (Denmark)

    Zhang, Hui; Dyrby, Tim B; Alexander, Daniel C

    2011-01-01

    tissue than measures derived from diffusion tensor imaging. Most existing techniques for axon diameter mapping assume a single axon orientation in the tissue model, which limits their application to only the most coherently oriented brain white matter, such as the corpus callosum, where the single......This paper proposes a technique for a previously unaddressed problem, namely, mapping axon diameter in crossing fiber regions, using diffusion MRI. Direct measurement of tissue microstructure of this kind using diffusion MRI offers a new class of biomarkers that give more specific information about...... orientation assumption is a reasonable one. However, fiber crossings and other complex configurations are widespread in the brain. In such areas, the existing techniques will fail to provide useful axon diameter indices for any of the individual fiber populations. We propose a novel crossing fiber tissue...

  10. NEOWISE REACTIVATION MISSION YEAR TWO: ASTEROID DIAMETERS AND ALBEDOS

    Energy Technology Data Exchange (ETDEWEB)

    Nugent, C. R.; Cutri, R. M. [Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125 (United States); Mainzer, A.; Bauer, J.; Kramer, E. A.; Masiero, J.; Sonnett, S. [Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 (United States); Grav, T. [Planetary Science Institute, Tucson, AZ (United States); Wright, E. L., E-mail: cnugent@ipac.caltech.edu [Department of Physics and Astronomy, University of California, Los Angeles, CA 90095 (United States)

    2016-09-01

    The Near-Earth Object Wide-Field Infrared Survey Explorer (NEOWISE) mission continues to detect, track, and characterize minor planets. We present diameters and albedos calculated from observations taken during the second year since the spacecraft was reactivated in late 2013. These include 207 near-Earth asteroids (NEAs) and 8885 other asteroids. Of the NEAs, 84% NEAs did not have previously measured diameters and albedos by the NEOWISE mission. Comparison of sizes and albedos calculated from NEOWISE measurements with those measured by occultations, spacecraft, and radar-derived shapes shows accuracy consistent with previous NEOWISE publications. Diameters and albedos fall within ±∼20% and ±∼40%, 1-sigma, respectively, of those measured by these alternate techniques. NEOWISE continues to preferentially discover near-Earth objects which are large (>100 m), and have low albedos.

  11. Diameter sensitive effect in singlewalled carbon nanotubes upon acid treatment

    International Nuclear Information System (INIS)

    Costa, S.; Borowiak-Palen, E.

    2009-01-01

    Singlewalled carbon nanotubes (SWCNT) exhibit very unique properties. As an electronic system they undergo amphoteric doping effects (n-type and p-type) which can be reversed. These processes affect the optical and vibronic properties of the carbon nanotubes. The most common and widely used procedure which changes the properties of the SWCNT is acid treatment applied as a purification procedure. This effect has been widely studied but not fully understood so far. Here, we present a study, in which a diameter sensitive effect has been observed. Therefore, two kinds of SWCNT samples have been studied: (i) produced via chemical vapour deposition with a broad diameter distribution, and (ii) synthesised by the laser ablation technique which is commonly known to result in narrow diameter distribution bulk SWCNT samples. Resonance Raman spectroscopy, optical absorption spectroscopy, and Fourier transform middle-infrared spectroscopy have been applied for the characterisation of the samples.

  12. Bubble behaviour and mean diameter in subcooled flow boiling

    Energy Technology Data Exchange (ETDEWEB)

    Zeitoun, O.; Shoukri, M. [McMaster Univ., Hamilton, Ontario (Canada)

    1995-09-01

    Bubble behaviour and mean bubble diameter in subcooled upward flow boiling in a vertical annular channel were investigated under low pressure and mass flux conditions. A high speed video system was used to visualize the subcooled flow boiling phenomenon. The high speed photographic results indicated that, contrary to the common understanding, bubbles tend to detach from the heating surface upstream of the net vapour generation point. Digital image processing technique was used to measure the mean bubble diameter along the subcooled flow boiling region. Data on the axial area-averaged void fraction distributions were also obtained using a single beam gamma densitometer. Effects of the liquid subcooling, applied heat flux and mass flux on the mean bubble size were investigated. A correlation for the mean bubble diameter as a function of the local subcooling, heat flux and mass flux was obtained.

  13. A study on the Horizontal Control of a Seat for Heavy Machinery using a Phase Adjusting Technique

    Directory of Open Access Journals (Sweden)

    Kim Chae-sil.

    2016-01-01

    Full Text Available This study proposes a dynamic plant model to simulate the performance of a heavy equipment vehicle seat system. The system controls the transmission of vibration using a phase adjustment control method. First, a dynamic model for the flexible heavy equipment seat is proposed using a commercial multi-body dynamic analysis tool, ADAMS. This model is used as a plant model. Then a phase adjustment control mechanism for reducing the vibration and shock transmitted by the seat is applied to the driving dynamics control plant model. Angle control using the phase adjustment control was confirmed. This technique is expected to be the basis for a future commercial system.

  14. The reaction of lithium metal vapor with single walled carbon nanotubes of large diameters

    Czech Academy of Sciences Publication Activity Database

    Kalbáč, Martin; Kavan, Ladislav; Dunsch, L.

    2009-01-01

    Roč. 246, 11-12 (2009), s. 2428-2431 ISSN 0370-1972 R&D Projects: GA AV ČR IAA400400911; GA AV ČR KAN200100801; GA AV ČR IAA400400804; GA ČR GC203/07/J067; GA MŠk LC510 Institutional research plan: CEZ:AV0Z40400503 Keywords : lithium * single walled carbon nanotubes * Raman spectroscopy Subject RIV: CG - Electrochemistry Impact factor: 1.150, year: 2009

  15. Determination of the Tapping Part Diameter of the Thread Mill

    Directory of Open Access Journals (Sweden)

    A. E. Dreval'

    2015-01-01

    Full Text Available Currently, there is a tendency to increase the proportion of thread milling operations, among other ways of tapping, which is associated with increasing number of CNC machines, flexibility and versatility of the process.Developments presently existing in the RF and used in the thread mills deal, mainly, with the thread milling cutter designs, to process internal and external thread with straight flutes made from high-speed steel.The paper presents a technique to calculate and select the initial design parameters, i.e. the external diameter of the tapping part of thread milling cutter, which is chosen as a basic computational design. The analysis of directories of tool companies containing foreign de-signs of solid thread end-milling cutters has shown that most of them rep-resent the thread cutter designs made of solid carbide. There are solid and interlocking side milling cutters, which use a tapping part both as a single-disk and as a multi-disk one; chip flutes are made to be both as direct and as screw; solid designs of cutters are made from carbide with a diameter of up to 20 ... 25 mm; thread cutters can be left- and right-hand cutting; Designs of the combined thread mills are proposed; internal channels are used for coolant supply.It is shown that the purpose of the external diameter of the tapping part of the thread mill should take into account the effect of the thread mill diameter on the milling process performance, precision of thread profile received, taper thread, tool strength, and the volume of flutes.The analysis has shown that when choosing the external diameter of the thread mill it worth taking its maximum diameter to improve the char-acteristics of the process under the restrictions imposed on the accuracy of the formed thread.

  16. Metal-metal-hofteproteser

    DEFF Research Database (Denmark)

    Ulrich, Michael; Overgaard, Søren; Penny, Jeannette

    2014-01-01

    In Denmark 4,456 metal-on-metal (MoM) hip prostheses have been implanted. Evidence demonstrates that some patients develope adverse biological reactions causing failures of MoM hip arthroplasty. Some reactions might be systemic. Failure rates are associated with the type and the design of the Mo......M hip implant. A Danish surveillance programme has been initiated addressing these problems....

  17. Muscle Power during Standing and Seated Trunk Rotations with Different Weights

    Directory of Open Access Journals (Sweden)

    Erika Zemková

    2017-10-01

    Full Text Available This study compares peak and mean power during standing and seated trunk rotations with different weights. Twenty seven fit men completed four trials of trunk rotations in both standing and seated positions with a bar weight of 5.5, 10.5, 15.5, and 20 kg placed on the shoulders. The FiTRO Torso Premium was used to monitor basic biomechanical parameters throughout the movement. Results showed significantly higher peak power during standing than seated trunk rotations at weights of 20 kg (274.4±63.5 vs. 206.4±54.6 W, p=0.004, 15.5 kg (371.2±93.9 vs. 313.5±72.3 W, p=0.007, and 10.5 kg (336.9±77.8 vs. 286.3±66.0 W, p=0.009 but not at 5.5 kg (191.6±46.2 vs. 166.0±37.0 W, p=0.061. Similarly, mean power in the acceleration phase of trunk rotations was significantly higher when performed in standing than seated position at weights of 20 kg (143.2±32.1 vs. 101.9±23.7 W, p=0.008, 15.5 kg (185.1±42.3 vs. 150.4±36.5 W, p=0.019, and 10.5 kg (169.8±40.7 vs. 139.7±31.6 W, p=0.024 but not at 5.5 kg (107.4±29.4 vs. 86.5±21.1 W, p=0.111. Furthermore, peak and mean power during standing trunk rotations significantly correlated with values achieved in the seated position at the weight of 5.5 kg (r=0.684, p=0.027; r=0.676, p=0.033 but not at 10.5 kg (r=0.589, p=0.089; r=0.552, p=0.143, 15.5 kg (r=0.493, p=0.243; r=0.436, p=0.298, and 20 kg (r=0.357, p=0.361; r=0.333, p=0.417. In conclusion, power production is greater during standing as compared to seated trunk rotations, with more pronounced differences at higher weights. This fact has to be taken into account when training and testing the trunk rotational power.

  18. NEOWISE REACTIVATION MISSION YEAR ONE: PRELIMINARY ASTEROID DIAMETERS AND ALBEDOS

    Energy Technology Data Exchange (ETDEWEB)

    Nugent, C. R.; Cutri, R. M. [Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125 (United States); Mainzer, A.; Masiero, J.; Bauer, J.; Kramer, E.; Sonnett, S.; Stevenson, R. [Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 (United States); Grav, T. [Planetary Science Institute, Tucson, AZ (United States); Wright, E. L., E-mail: cnugent@ipac.caltech.edu [Department of Physics and Astronomy, University of California, Los Angeles, CA 90095 (United States)

    2015-12-01

    We present preliminary diameters and albedos for 7956 asteroids detected in the first year of the NEOWISE Reactivation mission. Of those, 201 are near-Earth asteroids and 7755 are Main Belt or Mars-crossing asteroids. 17% of these objects have not been previously characterized using the Near-Earth Object Wide-field Infrared Survey Explorer, or “NEOWISE” thermal measurements. Diameters are determined to an accuracy of ∼20% or better. If good-quality H magnitudes are available, albedos can be determined to within ∼40% or better.

  19. Control of the Diameter and Chiral Angle Distributions during Production of Single-Wall Carbon Nanotubes

    Science.gov (United States)

    Nikolaev, Pavel

    2009-01-01

    Many applications of single wall carbon nanotubes (SWCNT), especially in microelectronics, will benefit from use of certain (n,m) nanotube types (metallic, small gap semiconductor, etc.) Especially fascinating is the possibility of quantum conductors that require metallic armchair nanotubes. However, as produced SWCNT samples are polydisperse, with many (n,m) types present and typical approx.1:2 metal/semiconductor ratio. Nanotube nucleation models predict that armchair nuclei are energetically preferential due to formation of partial triple bonds along the armchair edge. However, nuclei can not reach any meaningful thermal equilibrium in a rapidly expanding and cooling plume of carbon clusters, leading to polydispersity. In the present work, SWCNTs were produced by a pulsed laser vaporization (PLV) technique. The carbon vapor plume cooling rate was either increased by change in the oven temperature (expansion into colder gas), or decreased via "warm-up" with a laser pulse at the moment of nucleation. The effect of oven temperature and "warm-up" on nanotube type population was studied via photoluminescence, UV-Vis-NIR absorption and Raman spectroscopy. It was found that reduced temperatures leads to smaller average diameters, progressively narrower diameter distributions, and some preference toward armchair structures. "Warm-up" shifts nanotube population towards arm-chair structures as well, but the effect is small. Possible improvement of the "warm-up" approach to produce armchair SWCNTs will be discussed. These results demonstrate that PLV production technique can provide at least partial control over the nanotube (n,m) population. In addition, these results have implications for the understanding the nanotube nucleation mechanism in the laser oven.

  20. Noble-Metal Chalcogenide Nanotubes

    Directory of Open Access Journals (Sweden)

    Nourdine Zibouche

    2014-10-01

    Full Text Available We explore the stability and the electronic properties of hypothetical noble-metal chalcogenide nanotubes PtS2, PtSe2, PdS2 and PdSe2 by means of density functional theory calculations. Our findings show that the strain energy decreases inverse quadratically with the tube diameter, as is typical for other nanotubes. Moreover, the strain energy is independent of the tube chirality and converges towards the same value for large diameters. The band-structure calculations show that all noble-metal chalcogenide nanotubes are indirect band gap semiconductors. The corresponding band gaps increase with the nanotube diameter rapidly approaching the respective pristine 2D monolayer limit.

  1. FACES WITH LARGE DIAMETER ON THE SYMMETRICAL TRAVELING SALESMAN POLYTOPE

    NARCIS (Netherlands)

    SIERKSMA, G; TIJSSEN, GA

    This paper deals with the symmetric traveling salesman polytope and contains three main theorems. The first one gives a new characterization of (non)adjacency. Based on this characterization a new upper bound for the diameter of the symmetric traveling salesman polytope (conjectured to be 2 by M.

  2. Sex determination from femoral head diameters in black Malawians ...

    African Journals Online (AJOL)

    Objectives: To determine the sex of black Malawians from femoral head diameters. Design: A retrospective study on patients investigated in three x-ray departments. Setting: Radiographs were collected from the archives of Queen Elizabeth Central, Chikwawa and Balaka hospitals. Subject: X-ray films of 496 pelves of adult ...

  3. Real-time precision measuring device of tree diameter growth

    Science.gov (United States)

    Guo, Mingming; Chen, Aijun; Li, Dongsheng; Liu, Nan; Yao, Jingyuan

    2016-01-01

    DBH(diameter at breast height) is an important factor to reflect of the quality of plant growth, also an important parameter indispensable in forest resources inventory and forest carbon sink, the accurate measurement of DBH or not is directly related to the research of forest resources inventory and forest carbon sink. In this paper, the principle and the mathematical model of DBH measurement device were introduced, the fixture measuring device and the hardware circuit for this tree diameter were designed, the measurement software programs were compiled, and the precision measuring device of tree diameter growth was developed. Some experiments with Australia fir were conducted. Based on experiment data, the correlations among the DBH variation of Australian fir, the environment temperature, air humility and PAR(photosynthetically active radiation) were obtained. The effects of environmental parameters (environment temperature, air humility and PAR) on tree diameter were analyzed. Experimental results show that there is a positive correlation between DBH variation of Australian fir and environment temperature, a negative correlation between DBH variation of Australian fir and air humility , so is PAR.

  4. Ultrasound Assessment of Normal Portal Vein Diameter in ...

    African Journals Online (AJOL)

    Even if the additional use of color and spectral Doppler improves the assessment of patients suspected of having portal hypertension, gray scale assessment of portal vein diameter is corner stone in the initial evaluation. Knowing the normal portal venous dimension in a specified population is so crucial. Methods: This is a ...

  5. Pupil Center as a Function of Pupil Diameter

    DEFF Research Database (Denmark)

    Ahmed, Zaheer; Mardanbegi, Diako; Hansen, Dan Witzner

    2016-01-01

    We investigate the gaze estimation error induced by pupil size changes using simulated data. We investigate the influence of pupil diameter changes on estimated gaze point error obtained by two gaze estimation models. Simulation data show that at wider viewing angles and at small eye...

  6. Individual tree diameter, height, and volume functions for longleaf pine

    Science.gov (United States)

    Carlos A. Gonzalez-Benecke; Salvador A. Gezan; Timothy A. Martin; Wendell P. Cropper; Lisa J. Samuelson; Daniel J. Leduc

    2014-01-01

    Currently, little information is available to estimate individual tree attributes for longleaf pine (Pinus palustris Mill.), an important tree species of the southeastern United States. The majority of available models are local, relying on stem diameter outside bark at breast height (dbh, cm) and not including stand-level parameters. We developed...

  7. Definition of Beam Diameter for Electron Beam Welding

    Energy Technology Data Exchange (ETDEWEB)

    Burgardt, Paul [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Pierce, Stanley W. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Dvornak, Matthew John [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2016-03-11

    It is useful to characterize the dimensions of the electron beam during process development for electron beam welding applications. Analysis of the behavior of electron beam welds is simplest when a single number can be assigned to the beam properties that describes the size of the beam spot; this value we generically call the “beam diameter”. This approach has worked well for most applications and electron beam welding machines with the weld dimensions (width and depth) correlating well with the beam diameter. However, in recent weld development for a refractory alloy, Ta-10W, welded with a low voltage electron beam machine (LVEB), it was found that the weld dimensions (weld penetration and weld width) did not correlate well with the beam diameter and especially with the experimentally determined sharp focus point. These data suggest that the presently used definition of beam diameter may not be optimal for all applications. The possible reasons for this discrepancy and a suggested possible alternative diameter definition is the subject of this paper.

  8. Novel Genetic Loci Associated with Retinal Microvascular Diameter

    NARCIS (Netherlands)

    R.A. Jensen (Richard); X. Sim (Xueling); G.D. Smith; X. Li (Xiaohui); M. Jakobsdottir (Margret); C-Y. Cheng (Ching-Yu); J. Brody (Jennifer); M.F. Cotch (Mary Frances); B. McKnight (Barbara); R. Klein (Ronald); J.J. Wang (Jie Jin); A. Kifley (Annette); T.B. Harris (Tamara); L.J. Launer (Lenore); K.D. Taylor (Kent D.); B.E.K. Klein (Barbara); L.J. Raffel (Leslie); X. Li (Xiang); M.A. Ikram (Arfan); C.C.W. Klaver (Caroline); S.J. van der Lee (Sven); U. Mutlu (Unal); A. Hofman (Albert); A.G. Uitterlinden (André); C. Liu (Chunyu); A. Kraja (Aldi); P. Mitchell (Paul); V. Gudnason (Vilmundur); J.I. Rotter (Jerome I.); E.A. Boerwinkle (Eric); C.M. van Duijn (Cornelia); B.M. Psaty (Bruce); T.Y. Wong (Tien Yin)

    2016-01-01

    textabstractBackground-There is increasing evidence that retinal microvascular diameters are associated with cardiovascular and cerebrovascular conditions. The shared genetic effects of these associations are currently unknown. The aim of this study was to increase our understanding of the genetic

  9. Assessment of vessel diameters for MR brain angiography processed images

    Science.gov (United States)

    Moraru, Luminita; Obreja, Cristian-Dragos; Moldovanu, Simona

    2015-12-01

    The motivation was to develop an assessment method to measure (in)visible differences between the original and the processed images in MR brain angiography as a method of evaluation of the status of the vessel segments (i.e. the existence of the occlusion or intracerebral vessels damaged as aneurysms). Generally, the image quality is limited, so we improve the performance of the evaluation through digital image processing. The goal is to determine the best processing method that allows an accurate assessment of patients with cerebrovascular diseases. A total of 10 MR brain angiography images were processed by the following techniques: histogram equalization, Wiener filter, linear contrast adjustment, contrastlimited adaptive histogram equalization, bias correction and Marr-Hildreth filter. Each original image and their processed images were analyzed into the stacking procedure so that the same vessel and its corresponding diameter have been measured. Original and processed images were evaluated by measuring the vessel diameter (in pixels) on an established direction and for the precise anatomic location. The vessel diameter is calculated using the plugin ImageJ. Mean diameter measurements differ significantly across the same segment and for different processing techniques. The best results are provided by the Wiener filter and linear contrast adjustment methods and the worst by Marr-Hildreth filter.

  10. Uncertainty budget for optical coordinate measurements of circle diameter

    DEFF Research Database (Denmark)

    Morace, Renate Erica; Hansen, Hans Nørgaard; De Chiffre, Leonardo

    2004-01-01

    An uncertainty analysis for circle diameter measurements using a coordinate measuring machine (CMM) equipped with an optical probe is presented in this paper. A mathematical model for data evaluation and uncertainty assessment was formulated in accordance with Guide to the Expression of Uncertain...

  11. Determination of perimysial and fascicular diameters of triceps ...

    African Journals Online (AJOL)

    In this study, it was observed that all the muscles studied presented normal histomorphology of a typical skeletal muscle, it was discovered that the biceps brachii muscle from camel aged 7 years had higher and significant value for the perimysial diameter compared to that of cattle. Similarly, it was shown that there is an ...

  12. Retinal vessel diameters and risk of stroke: the Rotterdam Study

    NARCIS (Netherlands)

    Ikram, M. K.; de Jong, F. J.; Bos, M. J.; Vingerling, J. R.; Hofman, A.; Koudstaal, P. J.; de Jong, P. T. V. M.; Breteler, M. M. B.

    2006-01-01

    Retinal vessels may provide information on cerebral vascular pathology, because they share many features with cerebral vessels. A smaller ratio of the retinal arteriolar-to-venular diameters reportedly predicts the risk of stroke. It is unclear if this is due to arteriolar narrowing or venular

  13. Bipartite Diametrical Graphs of Diameter 4 and Extreme Orders

    Directory of Open Access Journals (Sweden)

    Salah Al-Addasi

    2008-01-01

    in which this upper bound is attained, this graph can be viewed as a generalization of the Rhombic Dodecahedron. Then we show that for any ≥2, the graph (2,2 is the unique (up to isomorphism bipartite diametrical graph of diameter 4 and partite sets of cardinalities 2 and 2, and hence in particular, for =3, the graph (6,8 which is just the Rhombic Dodecahedron is the unique (up to isomorphism bipartite diametrical graph of such a diameter and cardinalities of partite sets. Thus we complete a characterization of -graphs of diameter 4 and cardinality of the smaller partite set not exceeding 6. We prove that the neighborhoods of vertices of the larger partite set of (2,2 form a matroid whose basis graph is the hypercube . We prove that any -graph of diameter 4 is bipartite self complementary, thus in particular (2,2. Finally, we study some additional properties of (2,2 concerning the order of its automorphism group, girth, domination number, and when being Eulerian.

  14. Modelling diameter growth, mortality and recruitment of trees in ...

    African Journals Online (AJOL)

    Miombo woodlands cover large areas in Tanzania but very little reliable data on forest dynamics for the woodlands exist. The main objective of this study was to develop a model system describing such dynamics based on easily measurable tree variables. Individual tree diameter growth and mortality models, and ...

  15. Sex differences in diameter of the coronary sinus ostium: Correlation ...

    African Journals Online (AJOL)

    Seventy-four hearts of adult black Kenyans [43 male, 31 females; age range 20 – 70 years] obtained during autopsy at the Department of Human Anatomy, University of Nairobi, Kenya were weighed. The coronary sinus ostium was identified and its transverse and supero-inferior diameters measured in millimeters.

  16. A small-diameter NMR logging tool for groundwater investigations

    Science.gov (United States)

    Walsh, David; Turner, Peter; Grunewald, Elliot; Zhang, Hong; Butler, James J.; Reboulet, Ed; Knobbe, Steve; Christy, Tom; Lane, John W.; Johnson, Carole D.; Munday, Tim; Fitzpatrick, Andrew

    2013-01-01

    A small-diameter nuclear magnetic resonance (NMR) logging tool has been developed and field tested at various sites in the United States and Australia. A novel design approach has produced relatively inexpensive, small-diameter probes that can be run in open or PVC-cased boreholes as small as 2 inches in diameter. The complete system, including surface electronics and various downhole probes, has been successfully tested in small-diameter monitoring wells in a range of hydrogeological settings. A variant of the probe that can be deployed by a direct-push machine has also been developed and tested in the field. The new NMR logging tool provides reliable, direct, and high-resolution information that is of importance for groundwater studies. Specifically, the technology provides direct measurement of total water content (total porosity in the saturated zone or moisture content in the unsaturated zone), and estimates of relative pore-size distribution (bound vs. mobile water content) and hydraulic conductivity. The NMR measurements show good agreement with ancillary data from lithologic logs, geophysical logs, and hydrogeologic measurements, and provide valuable information for groundwater investigations.

  17. Mountain pine beetle infestations in relation to lodgepole pine diameters

    Science.gov (United States)

    Walter E. Cole; Gene D. Amman

    1969-01-01

    Tree losses resulting from infestation by the mountain pine beetle (Dendroctonus ponderosae Hopkins) were measured in two stands of lodgepole pine (Pinus contorta Dougl.) where the beetle population had previously been epidemic. Measurement data showed that larger diameter trees were infested and killed first. Tree losses...

  18. Height-Diameter Predictive Equations for Rubber ( Hevea ...

    African Journals Online (AJOL)

    Many of the resulting models and curves agreed with silvicultural expectation of sigmoidal growth functions; and can provide dependable cum flexible options of predicting heights, given dbh for many plantation species in Nigeria. Keywords: height-diameter equations, allometric models, predictive equations, sigmoidal ...

  19. Experimental study on strain sensing by small-diameter FBG

    Science.gov (United States)

    Liu, Rong-mei; Li, Qiufeng; Zhu, Lujia; Liang, Dakai

    2016-11-01

    Fiber Bragg grating (FBG) sensors were attractive in various fields for structural health monitoring. Because of their accurate performance and real time response, embedded FBG sensors are promising for strain monitoring in composite materials. As an optical fiber sensor was embedded inside a composite, interface would form around the embedded optical fiber and the host polymer composite. In order to study the influence of the embedded optical fiber to the mechanical character, finite elemental analysis was applied to study the stress distribution inside the composite. Keeping the resin rich area the same size, laminates with optical fibers in different diameters, which were 250 and 125 micrometers, were analyzed. The simulation results represent that stress singularity would occur around the embedded optical fiber. The singularity value for the laminate with optical fiber at 250 micrometer was higher than that with optical fiber at 125 micrometer. Micro- cracks would arise at the stress singularity point. Therefore, the optical fiber in smaller diameter was preferred since the mechanical strength could be higher. Four points bending test was carried out on a steel beam with a small-diameter FBG on the bottom surface. Besides, a strain gauge was stuck on bottom to validate the monitoring results by FBG sensor. The tested results indicated that the strain monitoring results by the small-diameter FBG sensor almost identical with the theoretical ones and what recorded by strain gauge. The maximum testing error for the designed FBG is less than 2% compared with the theoretical one.

  20. Study of tube diameter effect on the burnout

    International Nuclear Information System (INIS)

    Levitan, L.L.; Lantsman, F.P.; Dedneva, E.I.

    1981-01-01

    Effect of a tube diameter d on boundary steam content Xsub(b) is experimentally investigated during unwashed liquid wall film drying in the disperse-ring flow regime. For this purpose systematical experimental investigations of the burnout of the second kind in tubes with diameters of 4, 6 and 12 mm have been carried out as well as the other data relating to burnout in tubes with diameter from 4 to 40 mm are used. The investigations have been carried out at water and steam pressures of 4.9-13.7 MPa and mass velocities from 750 to 5000 kg/m 2 xs. It is elucidated that increase in the tube diameter results in reducing the ranges of pressures and mass velocities at which Xsub(b) is independent of heat flux. Quantity dependence Xsub(b)=f(d) has been obtained as well. The best agreement with data from different experiments is observed when taking into account the effect of d on Xsub(b) by means of the following relation: Xsub(b) is proportional to dsup(-0.25). In this case divergence, as a rule, does not exceed 10% [ru

  1. NEOWISE Reactivation Mission Year Three: Asteroid Diameters and Albedos

    Energy Technology Data Exchange (ETDEWEB)

    Masiero, Joseph R.; Mainzer, A. K.; Kramer, E. [Jet Propulsion Laboratory/California Institute of Technology, 4800 Oak Grove Drive, MS 183-301, Pasadena, CA 91109 (United States); Nugent, C.; Cutri, R. M. [California Institute of Technology, Infrared Processing and Analysis Center, 1200 California Boulevard, Pasadena, CA 91125 (United States); Wright, E. L. [University of California, Los Angeles, CA 90095 (United States); Bauer, J. M. [University of Maryland, College Park, MD 20742 (United States); Grav, T.; Sonnett, S., E-mail: Joseph.Masiero@jpl.nasa.gov [Planetary Science Institute, 1700 E Fort Lowell Road #106, Tucson, AZ 85719 (United States)

    2017-10-01

    The Near-Earth Object Wide-field Infrared Survey Explorer (NEOWISE) reactivation mission has completed its third year of surveying the sky in the thermal infrared for near-Earth asteroids and comets. NEOWISE collects simultaneous observations at 3.4 and 4.6  μ m of solar system objects passing through its field of regard. These data allow for the determination of total thermal emission from bodies in the inner solar system, and thus the sizes of these objects. In this paper, we present thermal model fits of asteroid diameters for 170 NEOs and 6110 Main Belt asteroids (MBAs) detected during the third year of the survey, as well as the associated optical geometric albedos. We compare our results with previous thermal model results from NEOWISE for overlapping sample sets, as well as diameters determined through other independent methods, and find that our diameter measurements for NEOs agree to within 26% (1 σ ) of previously measured values. Diameters for the MBAs are within 17% (1 σ ). This brings the total number of unique near-Earth objects characterized by the NEOWISE survey to 541, surpassing the number observed during the fully cryogenic mission in 2010.

  2. Height-diameter allometry of tropical forest trees

    Science.gov (United States)

    T.R. Feldpausch; L. Banin; O.L. Phillips; T.R. Baker; S.L. Lewis; C.A. Quesada; K. Affum-Baffoe; E.J.M.M. Arets; N.J. Berry; M. Bird; E.S. Brondizio; P de Camargo; J. Chave; G. Djagbletey; T.F. Domingues; M. Drescher; P.M. Fearnside; M.B. Franca; N.M. Fyllas; G. Lopez-Gonzalez; A. Hladik; N. Higuchi; M.O. Hunter; Y. Iida; K.A. Salim; A.R. Kassim; M. Keller; J. Kemp; D.A. King; J.C. Lovett; B.S. Marimon; B.H. Marimon-Junior; E. Lenza; A.R. Marshall; D.J. Metcalfe; E.T.A. Mitchard; E.F. Moran; B.W. Nelson; R. Nilus; E.M. Nogueira; M. Palace; S. Patiño; K.S.-H. Peh; M.T. Raventos; J.M. Reitsma; G. Saiz; F. Schrodt; B. Sonke; H.E. Taedoumg; S. Tan; L. White; H. Woll; J. Lloyd

    2011-01-01

    Tropical tree height-diameter (H:D) relationships may vary by forest type and region making large-scale estimates of above-ground biomass subject to bias if they ignore these differences in stem allometry. We have therefore developed a new global tropical forest database consisting of 39 955 concurrent H and D measurements encompassing 283 sites in 22 tropical...

  3. Prediction and error of baldcypress stem volume from stump diameter

    Science.gov (United States)

    Bernard R. Parresol

    1998-01-01

    The need to estimate the volume of removals occurs for many reasons, such as in trespass cases, severance tax reports, and post-harvest assessments. A logarithmic model is presented for prediction of baldcypress total stem cubic foot volume using stump diameter as the independent variable. Because the error of prediction is as important as the volume estimate, the...

  4. predictive accuracy of transcerebellar diameter in comparison with ...

    African Journals Online (AJOL)

    2014-04-04

    Apr 4, 2014 ... IOMETRIC PARAMETERS FOR GESTATIONAL AGE ESTIMATION AMONG PREGNANT NIGERIAN WOMEN. A. A. Adeyekun ... Objective: To compare the predictive accuracy of foetal trans-cerebellar diameter(TCD) with those of other ... due to increased curvature of the foetus, which affects reliability of ...

  5. Percentile-based Weibull diameter distribution model for Pinus ...

    African Journals Online (AJOL)

    Using a site index equation and stem volume model developed for Pinus kesiya in the Philippines, a yield prediction system was created to predict the volume per ha (VPH) for each diameter class and, subsequently, the total volume of a stand. To evaluate the yield prediction system, the predicted mean VPH for each ...

  6. Multi-diameter pigging: factors affecting the design and selection of pigging tools for multi-diameter pipelines

    Energy Technology Data Exchange (ETDEWEB)

    Dawson, Karl [Pipeline Engineering and Supply Co. Ltd., Richmond, NY (United States)

    2009-07-01

    This paper will consider the process involved in pigging tool selection for pipelines with two or more significant internal diameters which require pigging tools capable of negotiating the different internal diameters whilst also carrying out the necessary pipeline cleaning operation. The paper will include an analysis of pipeline features that affect pigging tool selection and then go on to look at other variables that determine the pigging tool design; this will include a step by step guide outlining how the tool is designed, the development of prototype pigs and the importance of testing and validation prior to final deployment in operational pigging programmes. (author)

  7. Hemodynamic responses to seated and supine lower body negative pressure - Comparison with +Gz acceleration

    Science.gov (United States)

    Polese, Alvese; Sandler, Harold; Montgomery, Leslie D.

    1992-01-01

    The hemodynamic responses to LBNP in seated subjects and in subjects in supine body positions were compared and were correlated with hemodynamic changes which occurred during a simulated (by centrifugation) Shuttle reentry acceleration with a slow onset rate of 0.002 G/s and during gradual onset exposures to +3 Gz and +4 Gz. Results demonstrate that seated LBNP at a level of -40 mm Hg can serve as a static simulator for changes in the heart rate and in mean blood pressure induced by gradual onset acceleration stress occurring during Shuttle reentry. The findings also provide a rationale for using LBNP during weightlessness as a means of imposing G-loading on the circulation prior to reentry.

  8. Seat belt syndrome with unstable Chance fracture dislocation of the second lumbar vertebra without neurological deficits.

    Science.gov (United States)

    Onu, David O; Hunn, Andrew W; Bohmer, Robert D

    2014-01-08

    The seat belt syndrome is a recognised complication of seat belt use in vehicles. Unstable Chance fractures of the spine without neurological deficits have been reported infrequently. We describe a young woman with completely disrupted Chance fracture of the second lumbar vertebra in association with left hemidiaphragmatic rupture/hernia, multiple bowel perforations, splenic capsular tear, left humeral shaft and multiple rib fractures. These injuries which resulted from high-speed vehicle collision and led to death of one of the occupants were readily detected by trauma series imaging. The patient was successfully treated by a dedicated multidisciplinary team which adopted a staged surgical approach and prioritisation of care. There were no manifested neurological or other deficits after 1 year of follow-up. To the authors' knowledge, this is the first report of such a case in Australasia. We discuss the challenging surgical management, highlighting the role of radiological imaging in such cases and provide a literature review.

  9. Afterloading technique for interstitial irradiation of lesions in deep-seated organs

    International Nuclear Information System (INIS)

    Kitagawa, T.; Kakehi, M.; Kunieda, T.

    1982-01-01

    An afterloading procedure using iridium 192 seeds was developed for the control of both localized primary lesions that are difficult to remove and superficial residual lesions that remain after the partial removal of tumors in relatively inaccessible, deep-seated organs. This technique makes possible the delivery of a minimal radiation dose to lesions in deep-seated organs. Fewer complications result, the seeds can be adjusted at appropriate intervals in proportion to the amount of radioactivity desired, and radiation exposure to personnel can be reduced. This paper describes the techniques and apparatus used to place the seeds in the tubing. Primary lesions of the urinary bladder, the prostate gland, and the esophagus, residual lesions in the brain and lung, and metastases in intrapelvic lymph nodes were treated. No technical difficulties or complications were encountered. Radiation exposures to personnel were minimized. The results indicate that the procedure has practical applications

  10. Seat headrest-incorporated personalized ventilation: Thermal comfort and inhaled air quality

    DEFF Research Database (Denmark)

    Melikov, Arsen Krikor; Ivanova, T.; Stefanova, G.

    2012-01-01

    and 26/26 °C, respectively. Questionnaires were used to collect human responses. Personal exposure effectiveness (the portion of the clean personalized air in inhalation) of up to 99% was measured during the manikin experiments. The results suggest a dramatic improvement of inhaled air quality......The performance of personalized ventilation with seat headrest-mounted air supply terminal devices (ATD), named seat headrest personalized ventilation (SHPV), was studied. Physical measurements using a breathing thermal manikin were taken to identify its ability to provide clean air to inhalation...... depending on design, shape, size and positioning of the ATD, flow rate and temperature of personalized air, room temperature, clothing thermal insulation of the manikin, etc. Tracer gas was mixed with the room air. The air supplied by the SHPV was free of tracer gas. Tracer gas concentration in the air...

  11. Corrosion and deposit determination in large diameter pipes by radiography

    International Nuclear Information System (INIS)

    Harara, W.

    2006-08-01

    Two steel reference pipes with outer diameters of 8 and 12 inches were machined to make artificial defects on each of them, such as inside and outside steps of different wall thicknesses, inside and outside flat bottomed holes (FBH) of different diameters and depths on steps, flat area (FA), and ground patch (GP). The artificial defect were made to simulate natural corrosion attack as regular corrosion and pitting. The two reference pipes were tested according to tangential radiography technique and double wall single image technique. Tangential radiography technique had been applied using Co-60 radio-isotope to determine the steps thicknesses, the FBH, the remaining wall thickness under the FA, the remaining wall thickness above the GP, and the minimum detectable thickness of the artificial cement deposit on the two reference pipes, with and without insulation. Double wall single image technique had also been applied on the two reference pipes with and without insulation using Ir-192 radio-isotope to measure the flat bottomed holes depths, GP depth, and FA depth by density measurement. The measurement results obtained from the radiographs confirm that, tangential radiography technique can be applied to detect and evaluate the inside and outside regular corrosion attack in the large diameter pipes. It can also be applied to detect and evaluate the outside FBH with depth equal or greater than 10%. Inside 10% FBH and inside 20% FBH can not be detected if their diameters are not larger than certain value related to diameter and wall thickness of the pipe under test. Increasing the film density up to 5 outside the pipe did not provide any detection improvement of 10% and 20% inside FBH. Tangential radiography technique can also be applied to detect and measure the deposit inside the pipes. Double wall technique can be applied as an alternative method of the tangential radiography technique to detect and to evaluate the shallow and small diameter, 10% and 20% inside FBH

  12. Vertical Impact Tests of a Modified F/FB-111 Crew Seat to Evaluate Headrest Position and Restraint Configuration Effects

    Science.gov (United States)

    1982-08-01

    a w e4 4 a D Di -cc - hi *~.0 - -1M ~ ’U~~~~~ %" 0 N 𔃺 0 CI N N N N N M wmU co ~ ~ ~ cc 1= cc w *c a a pj= ’o u.. -2 N ON 4 - - r4 0’%ON N- a td e~M...SEAT PHN Z 502.05 26.46 3866.00 3644.00 11 RT SEAT PAN Z 635.94 2b7 %4 3665.CO 3609.00 12 CT SEAT PAN Z 795.27 24.49 3869.00 36t.8.00 13 TOTAL SEAT 1

  13. A Qualitative Case Study on the Implementation of a Priority Seating Program at an NCAA Division I School

    National Research Council Canada - National Science Library

    Delich, Joseph R

    2004-01-01

    ...) athletic department's priority seating program. A qualitative case study was the chosen methodology and the use of personal interviews and documents were the primary sources of evidence for data collection...

  14. Development of an Emergency Locking Unit for a Belt-In-Seat (BIS System Using a MEMS Acceleration Sensor

    Directory of Open Access Journals (Sweden)

    Chang Hyun Baek

    2010-04-01

    Full Text Available This paper proposes an emergency locking unit (ELU for a seat belt retractor which is mounted on the back frame of a vehicle seat. The proposed unit uses a recliner sensor based on a MEMS acceleration sensor and solenoid mechanism. The seat has an upper frame supported to tilt on a lower frame. The retractor in belt in seat (BIS system is supported by the upper frame. The proposed recliner sensor based on a MEMS acceleration sensor comprises orientation means for maintaining a predetermined orientation of emergency relative to the lower frame independently of the force of gravity when the upper frame tilts on the lower frame. Experimental results show that the developed recliner sensor unit operates effectively with respect to rollover angles. Thus, the developed unit will have a considerable potential to offer a new design concept in BIS system.

  15. Nuclear criticality safety calculational analysis for small-diameter containers

    International Nuclear Information System (INIS)

    LeTellier, M.S.; Smallwood, D.J.; Henkel, J.A.

    1995-11-01

    This report documents calculations performed to establish a technical basis for the nuclear criticality safety of favorable geometry containers, sometimes referred to as 5-inch containers, in use at the Portsmouth Gaseous Diffusion Plant. A list of containers currently used in the plant is shown in Table 1.0-1. These containers are currently used throughout the plant with no mass limits. The use of containers with geometries or material types other than those addressed in this evaluation must be bounded by this analysis or have an additional analysis performed. The following five basic container geometries were modeled and bound all container geometries in Table 1.0-1: (1) 4.32-inch-diameter by 50-inch-high polyethylene bottle; (2) 5.0-inch-diameter by 24-inch-high polyethylene bottle; (3) 5.25-inch-diameter by 24-inch-high steel can (open-quotes F-canclose quotes); (4) 5.25-inch-diameter by 15-inch-high steel can (open-quotes Z-canclose quotes); and (5) 5.0-inch-diameter by 9-inch-high polybottle (open-quotes CO-4close quotes). Each container type is evaluated using five basic reflection and interaction models that include single containers and multiple containers in normal and in credible abnormal conditions. The uranium materials evaluated are UO 2 F 2 +H 2 O and UF 4 +oil materials at 100% and 10% enrichments and U 3 O 8 , and H 2 O at 100% enrichment. The design basis safe criticality limit for the Portsmouth facility is k eff + 2σ < 0.95. The KENO study results may be used as the basis for evaluating general use of these containers in the plant

  16. Fabrication of Cell-Laden Hydrogel Fibers with Controllable Diameters

    Directory of Open Access Journals (Sweden)

    Zhuoqun Cheng

    2017-05-01

    Full Text Available Cell-laden hydrogel fibers are widely used as the fundamental building blocks to fabricate more complex functional three-dimensional (3D structures that could mimic biological tissues. The control on the diameter of the hydrogel fibers is important so as to precisely construct structures in the above 3D bio-fabrication. In this paper, a pneumatic-actuated micro-extrusion system is developed to produce hydrogel fibers based on the crosslinking behavior of sodium alginate with calcium ions. Excellent uniformity has been obtained in the diameters of the fabricated hydrogel fibers as a proportional-integral-derivative (PID control algorithm is applied on the driving pressure control. More importantly, a linear relationship has been obtained between the diameter of hydrogel fiber and the driving pressure. With the help of the identified linear model, we can precisely control the diameter of the hydrogel fiber via the control of the driving pressure. The differences between the measured and designed diameters are within ±2.5%. Finally, the influence of the calcium ions on the viability of the encapsulated cells is also investigated by immersing the cell-laden hydrogel fibers into the CaCl2 bath for different periods of time. LIVE/DEAD assays show that there is little difference among the cell viabilities in each sample. Therefore, the calcium ions utilized in the fabrication process have no impact on the cells encapsulated in the hydrogel fiber. Experimental results also show that the cell viability is 83 ± 2% for each sample after 24 h of culturing.

  17. Measurement error in CT assessment of appendix diameter

    Energy Technology Data Exchange (ETDEWEB)

    Trout, Andrew T.; Towbin, Alexander J. [Cincinnati Children' s Hospital Medical Center, Department of Radiology, MLC 5031, Cincinnati, OH (United States); Zhang, Bin [Cincinnati Children' s Hospital Medical Center, Department of Biostatistics and Epidemiology, Cincinnati, OH (United States)

    2016-12-15

    Appendiceal diameter continues to be cited as an important criterion for diagnosis of appendicitis by computed tomography (CT). To assess sources of error and variability in appendiceal diameter measurements by CT. In this institutional review board-approved review of imaging and medical records, we reviewed CTs performed in children <18 years of age between Jan. 1 and Dec. 31, 2010. Appendiceal diameter was measured in the axial and coronal planes by two reviewers (R1, R2). One year later, 10% of cases were remeasured. For patients who had multiple CTs, serial measurements were made to assess within patient variability. Measurement differences between planes, within and between reviewers, within patients and between CT and pathological measurements were assessed using correlation coefficients and paired t-tests. Six hundred thirty-one CTs performed in 519 patients (mean age: 10.9 ± 4.9 years, 50.8% female) were reviewed. Axial and coronal measurements were strongly correlated (r = 0.92-0.94, P < 0.0001) with coronal plane measurements significantly larger (P < 0.0001). Measurements were strongly correlated between reviewers (r = 0.89-0.9, P < 0.0001) but differed significantly in both planes (axial: +0.2 mm, P=0.003; coronal: +0.1 mm, P=0.007). Repeat measurements were significantly different for one reviewer only in the axial plane (0.3 mm difference, P<0.05). Within patients imaged multiple times, measured appendix diameters differed significantly in the axial plane for both reviewers (R1: 0.5 mm, P = 0.031; R2: 0.7 mm, P = 0.022). Multiple potential sources of measurement error raise concern about the use of rigid diameter cutoffs for the diagnosis of acute appendicitis by CT. (orig.)

  18. Stand diameter distribution modelling and prediction based on Richards function.

    Directory of Open Access Journals (Sweden)

    Ai-guo Duan

    Full Text Available The objective of this study was to introduce application of the Richards equation on modelling and prediction of stand diameter distribution. The long-term repeated measurement data sets, consisted of 309 diameter frequency distributions from Chinese fir (Cunninghamia lanceolata plantations in the southern China, were used. Also, 150 stands were used as fitting data, the other 159 stands were used for testing. Nonlinear regression method (NRM or maximum likelihood estimates method (MLEM were applied to estimate the parameters of models, and the parameter prediction method (PPM and parameter recovery method (PRM were used to predict the diameter distributions of unknown stands. Four main conclusions were obtained: (1 R distribution presented a more accurate simulation than three-parametric Weibull function; (2 the parameters p, q and r of R distribution proved to be its scale, location and shape parameters, and have a deep relationship with stand characteristics, which means the parameters of R distribution have good theoretical interpretation; (3 the ordinate of inflection point of R distribution has significant relativity with its skewness and kurtosis, and the fitted main distribution range for the cumulative diameter distribution of Chinese fir plantations was 0.4∼0.6; (4 the goodness-of-fit test showed diameter distributions of unknown stands can be well estimated by applying R distribution based on PRM or the combination of PPM and PRM under the condition that only quadratic mean DBH or plus stand age are known, and the non-rejection rates were near 80%, which are higher than the 72.33% non-rejection rate of three-parametric Weibull function based on the combination of PPM and PRM.

  19. Vertebral Artery Diameter and Flow: Nature or Nurture.

    Science.gov (United States)

    Tarnoki, Adam Domonkos; Fejer, Bence; Tarnoki, David Laszlo; Littvay, Levente; Lucatelli, Pierleone; Cirelli, Carlo; Fanelli, Fabrizio; Sacconi, Beatrice; Fagnani, Corrado; Medda, Emanuela; Farina, Filippo; Meneghetti, Giorgio; Horvath, Tamas; Pucci, Giacomo; Schillaci, Giuseppe; Stazi, Maria Antonietta; Baracchini, Claudio

    2017-09-01

    In contrast with the carotid arteries, the vertebral arteries (VAs) show considerable variation in length, caliber, and vessel course. This study investigated whether the variation in diameter and flow characteristics of the VAs might be inherited. A total of 172 Italian twins from Padua, Perugia, and Terni (54 monozygotic, 32 dizygotic) recruited from the Italian Twin Registry underwent B-mode and pulsed-wave Doppler ultrasound assessment of their VAs. VA diameters, peak systolic velocity (PSV) and end diastolic velocity (EDV) were assessed at the level of a horizontal V2 segment. Univariate quantitative genetic modeling was performed. Fourteen percent of the sample had VA hypoplasia. Within pair correlation in monozygotic twins was higher than in dizygotics (.552 vs. .229) for VA diameter. Age- and sex-adjusted genetic effect, under the most parsimonious model, accounted for 54.7% (95% CI: 42.2-69.1%) of the variance of VA diameter, and unshared environmental effect for 45.3% (95% CI: 30.9-57.8%). No heritability was found for the PSV of VA, but shared (34.1%; 95% CI: 16.7-53.7%) and unshared (65.9%; 95% CI: 45.9-83.1%) environmental factors determined the variance. EDV of VA is moderately genetically influenced (42.4%; 95% CI: 16.1-64.9%) and also determined by the unshared environment (57.6%; 95% CI: 34.7-83.7%). The diameter of the VAs is moderately genetically determined. Different factors influence the PSV and EDV of VAs, which may highlight the complex hemodynamic background of VA flow and help to understand the vertebral flow anomalies found by ultrasound. Copyright © 2017 by the American Society of Neuroimaging.

  20. Computational identification of genes modulating stem height-diameter allometry.

    Science.gov (United States)

    Jiang, Libo; Ye, Meixia; Zhu, Sheng; Zhai, Yi; Xu, Meng; Huang, Minren; Wu, Rongling

    2016-12-01

    The developmental variation in stem height with respect to stem diameter is related to a broad range of ecological and evolutionary phenomena in trees, but the underlying genetic basis of this variation remains elusive. We implement a dynamic statistical model, functional mapping, to formulate a general procedure for the computational identification of quantitative trait loci (QTLs) that control stem height-diameter allometry during development. Functional mapping integrates the biological principles underlying trait formation and development into the association analysis of DNA genotype and endpoint phenotype, thus providing an incentive for understanding the mechanistic interplay between genes and development. Built on the basic tenet of functional mapping, we explore two core ecological scenarios of how stem height and stem diameter covary in response to environmental stimuli: (i) trees pioneer sunlit space by allocating more growth to stem height than diameter and (ii) trees maintain their competitive advantage through an inverse pattern. The model is equipped to characterize 'pioneering' QTLs (piQTLs) and 'maintaining' QTLs (miQTLs) which modulate these two ecological scenarios, respectively. In a practical application to a mapping population of full-sib hybrids derived from two Populus species, the model has well proven its versatility by identifying several piQTLs that promote height growth at a cost of diameter growth and several miQTLs that benefit radial growth at a cost of height growth. Judicious application of functional mapping may lead to improved strategies for studying the genetic control of the formation mechanisms underlying trade-offs among quantities of assimilates allocated to different growth parts. © 2016 The Authors. Plant Biotechnology Journal published by Society for Experimental Biology and The Association of Applied Biologists and John Wiley & Sons Ltd.

  1. Large diameter metal on metal total hip replacement for femoral neck fractures with neurological conditions A retrospective assessment

    Directory of Open Access Journals (Sweden)

    Jia Li

    2014-01-01

    Conclusion: We believe the use of L-MoM can diminish the rate of instability or dislocation, after operation. The L-MoM is an option for patients with Parkinson′s disease and poliomyelitis with femoral neck fracture.

  2. Simulation of Adaptive Seat Energy Absorber for Military Rotorcraft Crash Safety Enhancement

    Science.gov (United States)

    2014-04-01

    1 2. Introduction 2 3. Model Development 3 4. Biodynamic Evaluation of Seated Human Model 5 4.1 STH Transmissibility (TR...head ( STH ) transmissibility (TR), and driving- point mechanical (DPM) impedance (10). To evaluate these performance indices, the whole human body model...Vibration module in the software. The frequency step and frequency range of 0.5 Hz, and up to 100 Hz were selected, respectively. 6 4.1 STH

  3. A report of two deep-seated noncutaneous penile tumors: more than meets the eye

    Directory of Open Access Journals (Sweden)

    Kerry Thomas, MD

    2017-12-01

    Full Text Available Penile cancer is an uncommon primary genitourinary malignancy, the vast majority representing superficial squamous cell carcinomas. However, less common skin cancers, secondary malignancies, mesenchymal neoplasms, and hematopoietic tumors do affect the penis. Medical history, atypical presentation, and deep epicenter of a penile mass may raise question of a nonepithelial neoplasm. We describe and discuss 2 examples of rare deep-seated penile malignancies, leiomyosarcoma and B-cell lymphoma.

  4. Influence of seating styles on head and pelvic vertical movement symmetry in horses ridden at trot.

    Science.gov (United States)

    Persson-Sjodin, Emma; Hernlund, Elin; Pfau, Thilo; Haubro Andersen, Pia; Rhodin, Marie

    2018-01-01

    Detailed knowledge of how a rider's seating style and riding on a circle influences the movement symmetry of the horse's head and pelvis may aid rider and trainer in an early recognition of low grade lameness. Such knowledge is also important during both subjective and objective lameness evaluations in the ridden horse in a clinical setting. In this study, inertial sensors were used to assess how different rider seating styles may influence head and pelvic movement symmetry in horses trotting in a straight line and on the circle in both directions. A total of 26 horses were subjected to 15 different conditions at trot: three unridden conditions and 12 ridden conditions where the rider performed three different seating styles (rising trot, sitting trot and two point seat). Rising trot induced systematic changes in movement symmetry of the horses. The most prominent effect was decreased pelvic rise that occurred as the rider was actively rising up in the stirrups, thus creating a downward momentum counteracting the horses push off. This mimics a push off lameness in the hindlimb that is in stance when the rider sits down in the saddle during the rising trot. On the circle, the asymmetries induced by rising trot on the correct diagonal counteracted the circle induced asymmetries, rendering the horse more symmetrical. This finding offers an explanation to the equestrian tradition of rising on the 'correct diagonal.' In horses with small pre-existing movement asymmetries, the asymmetry induced by rising trot, as well as the circular track, attenuated or reduced the horse's baseline asymmetry, depending on the sitting diagonal and direction on the circle. A push off hindlimb lameness would be expected to increase when the rider sits during the lame hindlimb stance whereas an impact hindlimb lameness would be expected to decrease. These findings suggest that the rising trot may be useful for identifying the type of lameness during subjective lameness assessment of

  5. Burn from car seat heater in a man with paraplegia: case report

    Science.gov (United States)

    Benjamin, Cheryl; Gittler, Michelle; Lee, Ray

    2011-01-01

    Objective/background Heated car seats are a common feature in newer automobiles. They are increasingly being recognized as potential hazards as there have been multiple reports of significant burns to its users. The potential for harm is considerably increased in those with impaired sensation with the possibility of a devastating injury. Methods Case report and literature review. Results A 26-year-old male with a T8 ASIA A paraplegia presented to the outpatient clinic for management of a hip burn. Two weeks prior to his visit he was driving a 2004 Jeep Cherokee for approximately 30 minutes. He was unaware that the driver's side seat warmer was set on high. He denied that his seat belt was in direct contact with the skin of his right hip. He presented to an acute care hospital that evening with a hip burn where he was prescribed silver sulfadiazine cream and instructed to apply it until his scheduled follow-up clinic visit. In clinic, the hip wound was unstageable with approximately 95% eschar. A dressing of bismuth tribromophenate in petrolatum was applied to the wound and he was instructed to change the dressing daily. This was later changed to an antimicrobial alginate dressing. The ulcer eventually healed. Conclusions This case illustrates the significant risk of car seat heaters in individuals with spinal cord injuries or neurological impairment who have decreased sensation. Additionally, it highlights an atypical area of potential for burn. Furthermore, it emphasizes the need for a heightened awareness for this unique and dangerous situation. PMID:21756574

  6. Sound, noise and speech at the 9000-seat Holy Trinity Church in Fatima, Portugal

    OpenAIRE

    António Pedro Oliveira de Carvalho; Pedro Miguel Aguiar da Silva

    2010-01-01

    This paper presents the interior acoustical characterization of the 9,000-seat church of the Holy Trinity in the Sanctuary of Fátima, Portugal, inaugurated in 2007. In situ measurements were held regarding interior sound pressure levels (with and without the HVAC equipment working), NC curves, RASTI (with and without the installed sound system) and reverberation time. The results are presented and commented according to the design values. A comparison is made with other churches in the world ...

  7. Modelling flow and heat transfer around a seated human body by computational fluid dynamics

    DEFF Research Database (Denmark)

    Sørensen, Dan Nørtoft; Voigt, Lars Peter Kølgaard

    2003-01-01

    A database (http://www.ie.dtu.dk/manikin) containing a detailed representation of the surface geometry of a seated female human body was created from a surface scan of a thermal manikin (minus clothing and hair). The radiative heat transfer coefficient and the natural convection flow around...... of the computational manikin has all surface features of a human being; (2) the geometry is an exact copy of an experimental thermal manikin, enabling detailed comparisons between calculations and experiments....

  8. Computed tomography-guided percutaneous core needle biopsy of deep seated bone lesions in two dogs

    International Nuclear Information System (INIS)

    Mori, T.; Sakaida, M.; Yamada, M.; Akiyama, H.; Takai, Y.; Sakai, H.; Maruo, K.

    2006-01-01

    Computed Tomography (CT)-guided percutaneous core needle biopsies were undertaken for the diagnosis of osteosarcoma in the pelvis (case 1) and myeloma (case 2) in the seventh lumber vertebra which were difficult to targeted by palpation, ultrasound or fluoroscopy. In both cases, enough tissue for pathological diagnosis were obtained without any complication. CT-guided biopsy was thought to be a safe, easy and effective technique for the evaluation of the deep seated bone lesion

  9. Seatbelt use and seat preference among pregnant women in Sapporo, Japan, in 2013.

    Science.gov (United States)

    Morikawa, Mamoru; Yamada, Takashi; Kato-Hirayama, Emi; Nishikawa, Akira; Watari, Michiko; Maeda, Nobuhiko; Kogo, Hiromasa; Minakami, Hisanori

    2016-07-01

    This study was performed to determine the rate of pregnant occupants in motor vehicle accidents (MVA) and the frequency of seatbelt use in pregnancy in Japan. A questionnaire survey was conducted at seven centers located in Sapporo, targeting all 3952 women in gestational weeks 35-37 during the study period between June 2013 and January 2014. Information was collected on parity, driver's license, seatbelt use, seat preference, carrying Mother and Child Health Handbook when going out, and experience of occupant MVA during current pregnancy. Women who reported always using a seatbelt were classified as always seatbelt users (ASU). A total of 2420 women who were given questionnaires provided responses (response rate, 61%). Seventy women (2.9%) reported having experienced an occupant MVA during the current pregnancy. MVA rate was significantly lower for ASU than non-ASU (2.6% [55/2097] vs 4.6% [15/323], respectively, P women preferring the rear seat than for other women (1.3% [6/451] vs 3.3% [64/1969], respectively, P = 0.0282). MVA rate tended to be lower for women preferring the rear seat than the front seat (1.7% [10/575] vs 3.3% [60/1845], respectively, P = 0.0637). The number of ASU, 94% (2286/2420) before pregnancy, decreased significantly to 87% (2097/2420) after the current pregnancy (P women toward driving safety may be associated with reduced risk of MVA in pregnancy. There is a need for an intensified campaign to promote seatbelt use among pregnant women. © 2016 Japan Society of Obstetrics and Gynecology.

  10. Radiologic findings of deep seated cerebral arteriovenous malformation with nonvisualization of straight sinus: focused on angiogram

    International Nuclear Information System (INIS)

    Won, Jong Boo; Park, Sung Ho; Hong, Jong Won; Kim, Yoo Kyoung; Shin, Mi Jeong; Baik, Seung Kuk; Choi, Han Yong; Kim, Bong Gi

    1999-01-01

    To analyze the radiologic-especially angiographic-findings of deep seated cerebral arteriovenous malformation(AVM) involving nonvisualized straight sinus. In six patients aged between 15 and 53 years with deep seated cerebral AVM, CT and MR images were retrospectively analyzed with regard to the following features : the presence of straight sinus, the location of AVM, and the occurrence of hemorrhage. Angiograms were analyzed for venous drainage routes of AVM, the appearance of veins, the presence of falcine sinus and venous drainage from normal deep brain parenchyme. In four patients who had undergone intravascular embolization therapy, pre- and post- embolization angiograms were compared. CT and MR images showed neither straight sinus nor thrombosis. AVMs were deeply seated in the brain, and in all cases there was cerebral hemorrhage. Angiograms disclosed that venous drainage of all AVMs occurred via the veins of Galen. In one case, venous flow via the falcine sinus to the superior sagittal sinus was noted, but in others, retrograde flow in the deep venous system was observed. Marked collateral routes followed in response to the obstruction of straight sinus included the basal vein of Rosenthal, the internal occipital, internal cerebral, and cerebellar hemispheric veins (which are Galenic afferents), and the inferior sagittal sinus. In all patients, contralateral routes were partially involved. Venous drainage from normal deep parenchyme through the transcerebral veins to the superficial venous system was noted, and in one case, straight sinus which had been observed on an angiogram five years earlier was no longer present. Angiography offers effective evaluation of the dynamic aspect of venous flow in cases involving deep-seated AVM, and of normal deep parenchyme in cases in which AVM involves nonvisualized straight sinus. Before intravascular treatment of AVM, venous flow must be carefully analyzed

  11. Radiologic findings of deep seated cerebral arteriovenous malformation with nonvisualization of straight sinus: focused on angiogram

    Energy Technology Data Exchange (ETDEWEB)

    Won, Jong Boo; Park, Sung Ho; Hong, Jong Won; Kim, Yoo Kyoung; Shin, Mi Jeong; Baik, Seung Kuk; Choi, Han Yong; Kim, Bong Gi [Wallace Memorial Baptist Hospital, Pusan (Korea, Republic of)

    1999-08-01

    To analyze the radiologic-especially angiographic-findings of deep seated cerebral arteriovenous malformation(AVM) involving nonvisualized straight sinus. In six patients aged between 15 and 53 years with deep seated cerebral AVM, CT and MR images were retrospectively analyzed with regard to the following features : the presence of straight sinus, the location of AVM, and the occurrence of hemorrhage. Angiograms were analyzed for venous drainage routes of AVM, the appearance of veins, the presence of falcine sinus and venous drainage from normal deep brain parenchyme. In four patients who had undergone intravascular embolization therapy, pre- and post- embolization angiograms were compared. CT and MR images showed neither straight sinus nor thrombosis. AVMs were deeply seated in the brain, and in all cases there was cerebral hemorrhage. Angiograms disclosed that venous drainage of all AVMs occurred via the veins of Galen. In one case, venous flow via the falcine sinus to the superior sagittal sinus was noted, but in others, retrograde flow in the deep venous system was observed. Marked collateral routes followed in response to the obstruction of straight sinus included the basal vein of Rosenthal, the internal occipital, internal cerebral, and cerebellar hemispheric veins (which are Galenic afferents), and the inferior sagittal sinus. In all patients, contralateral routes were partially involved. Venous drainage from normal deep parenchyme through the transcerebral veins to the superficial venous system was noted, and in one case, straight sinus which had been observed on an angiogram five years earlier was no longer present. Angiography offers effective evaluation of the dynamic aspect of venous flow in cases involving deep-seated AVM, and of normal deep parenchyme in cases in which AVM involves nonvisualized straight sinus. Before intravascular treatment of AVM, venous flow must be carefully analyzed.

  12. Accessing hospital packaged foods and beverages : the importance of a seated posture when eating

    OpenAIRE

    Bell, Alison; Tapsell, Linda; Walton, Karen; Yoxall, Alaster

    2017-01-01

    Background: Hospitalised and community dwelling older people (65 years and over), have difficulties opening food and beverage items such as cheese portions and tetra packs served in public hospitals. Previously, the role of hand strength on successful pack opening has been explored in a seated position. However, as many people in hospital eat in bed, this laboratory study examined the differences between participants opening a selection of products both in a hospital bed and a chair.\\ud Metho...

  13. Innovation Toilet and Barriers of Diffusion in Developing Country Case Study: TOTO Electronic Bidet Seat Toilet

    OpenAIRE

    Akbar Adhiutama; Michihiko Shinozaki; Seiichi Yoshikubo

    2012-01-01

    The innovation of electronic bidet seat toilet in Japan has diffused to more than sixty percent of Japanese household while it has low rate of diffusion in other countries especially in developing country. From this phenomenon, it is interesting to understand about the barrier of diffusion, which focuses on the adopter categories of diffusion, barrier factors and proposition of key success factors of the diffusion in Indonesia as one of emerging economic and the member of G 20. There have bee...

  14. Combination ergotamine and caffeine improves seated blood pressure and presyncopal symptoms in autonomic failure

    OpenAIRE

    Arnold, Amy C.; Ramirez, Claudia E.; Choi, Leena; Okamoto, Luis E.; Gamboa, Alfredo; Diedrich, André; Raj, Satish R.; Robertson, David; Biaggioni, Italo; Shibao, Cyndya A.

    2014-01-01

    Severely affected patients with autonomic failure require pressor agents to counteract the blood pressure fall and improve presyncopal symptoms upon standing. Previous studies suggest that combination ergotamine and caffeine may be effective in the treatment of autonomic failure, but the efficacy of this drug has not been evaluated in controlled trials. Therefore, we compared the effects of ergotamine/caffeine on seated blood pressure and orthostatic tolerance and symptoms in 12 primary auto...

  15. Comparative Assessment of Torso and Seat Mounted Restraint Systems using Manikins on the Horizontal Impulse Accelerator

    Science.gov (United States)

    2017-11-01

    Research Device (LARD) instrumented manikins were used in this test program to simulate human response. Data collection on the HIA consisted of manikin...microseconds, the user can freeze objects in motion, eliminate blur, and bring out the image detail needed for successful motion analysis. The camera...not run due to the unavailability of the Neck Protection Device (NPD). Cells MN and ON (no seat cushion), and Cells X and Y (no helmet) were not

  16. Physiological response in pilot/back-seat man during aerial combat maneuvers in F-4E aircraft.

    Science.gov (United States)

    Leverett, S. D., Jr.; Davis, H. M., Jr.; Winter, W. R.

    1972-01-01

    Comparison of objective/subjective physiological data between the pilot and the back-seat man during training within the G maneuvering envelope. It appears that the psychological requirements for the pilot to be mentally alert and physiologically adapted to a continually changing environment places additional responsibility on him to the extent the physiological signs monitored are indicative of a high stress condition and are increased by a significant amount over the back-seat man who is, in most instances, riding passively.

  17. Mapping the zone of eye-height utility for seated and standing observers

    Science.gov (United States)

    Wraga, M.; Proffitt, D. R.; Kaiser, M. K. (Principal Investigator)

    2000-01-01

    In a series of experiments, we delimited a region within the vertical axis of space in which eye height (EH) information is used maximally to scale object heights, referred to as the "zone of eye height utility" (Wraga, 1999b Journal of Experimental Psychology, Human Perception and Performance 25 518-530). To test the lower limit of the zone, linear perspective (on the floor) was varied via introduction of a false perspective (FP) gradient while all sources of EH information except linear perspective were held constant. For seated (experiment 1a) observers, the FP gradient produced overestimations of height for rectangular objects up to 0.15 EH tall. This value was taken to be just outside the lower limit of the zone. This finding was replicated in a virtual environment, for both seated (experiment 1b) and standing (experiment 2) observers. For the upper limit of the zone, EH information itself was manipulated by lowering observers' center of projection in a virtual scene. Lowering the effective EH of standing (experiment 3) and seated (experiment 4) observers produced corresponding overestimations of height for objects up to about 2.5 EH. This zone of approximately 0.20-2.5 EH suggests that the human visual system weights size information differentially, depending on its efficacy.

  18. The efficacy of airflow and seat vibration on reducing visually induced motion sickness.

    Science.gov (United States)

    D'Amour, Sarah; Bos, Jelte E; Keshavarz, Behrang

    2017-09-01

    Visually induced motion sickness (VIMS) is a well-known sensation in virtual environments and simulators, typically characterized by a variety of symptoms such as pallor, sweating, dizziness, fatigue, and/or nausea. Numerous methods to reduce VIMS have been previously introduced; however, a reliable countermeasure is still missing. In the present study, the effect of airflow and seat vibration to alleviate VIMS was investigated. Eighty-two participants were randomly assigned to one of four groups (airflow, vibration, combined airflow and vibration, and control) and then exposed to a 15 min long video of a bicycle ride shot from first-person view. VIMS was measured using the Fast Motion Sickness Scale (FMS) and the Simulator Sickness Questionnaire (SSQ). Results showed that the exposure of airflow significantly reduced VIMS, whereas the presence of seat vibration, in contrast, did not have an impact on VIMS. Additionally, we found that females reported higher FMS scores than males, however, this sex difference was not found in the SSQ scores. Our findings demonstrate that airflow can be an effective and easy-to-apply technique to reduce VIMS in virtual environments and simulators, while vibration applied to the seat is not a successful method.

  19. An evaluation method on seat comfort based on optical motion capture

    Directory of Open Access Journals (Sweden)

    Qing TAO

    2015-10-01

    Full Text Available To research the sitting posture comfort evaluation method, through the example of comfort evaluation of the ergonomic seat and standard office seat, a methodology is introduced to evaluate the sitting posture comfort combining ergonomics theory. The proposed method is based on optical motion capture system, pressure sensor and JACK software, and TRC file is acquired by using EVART real-time capture software for identifying the spatial motion trail of human body. Then MATLAB software is used to analyze the human body motion data, and the sitting posture angle difference data for human body in different seats is acquired. TRC file is loaded into JACK software, and with the TAT REPORTER of JACK software, muscle force, moment of force and fatigue data, etc. are output, which are compared with the actual measured data from experiments, and ergonomics method is used for the evaluation. The result shows that the method of considering joint angles combining JACK software for data output is effective for evaluating sitting comfort.

  20. Dynamics of seated computer work before and after prolonged constrained sitting.

    Science.gov (United States)

    Madeleine, Pascal

    2012-07-01

    This laboratory study investigated seated computer work before and after prolonged constrained sitting. Discomfort ratings and kinetic and kinematics data were recorded in nine healthy males performing computer work for 5 min before and after 96 min of sitting. The displacement of the center of pressure (CoP) in anterior-posterior and medial-lateral directions and lumbar curvature (LC) were calculated. The root mean square, standard deviation, and sample entropy values were computed from the CoPs and LC signals to assess the magnitude, amount of variability, and regularity of sitting dynamics, respectively. The discomfort increased for the buttocks (p = .02).The standard deviation and sample entropy values of the CoPs and LC signals, respectively, increased (p .15) after prolonged constrained sitting compared with before. This present study showed that during seated computer work, prolonged constrained sitting affected the amount of variability and the regularity of sitting postural control, whereas the magnitude was not affected. The importance of the dynamics of sitting control may challenge the idea of a static and ideal seated posture at work.