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  1. Clinical experiences of dynamic stabilizers: Dynesys and Dynesys top loading system for lumbar spine degenerative disease.

    Science.gov (United States)

    Hsieh, Cheng-Ta; Chang, Chih-Ju; Su, I-Chang; Lin, Li-Ying

    2016-04-01

    Dynesys (Dynamic Neutralization System) was designed to overcome the shortcomings of fusion. The Dynesys top loading (DTL) system is a new alternative Dynesys system that can be applied via a minimally invasive procedure. This study aimed to ascertain whether DTL is a suitable device for motion preservation and prevention of instability, and to compare the clinical and radiological outcomes between DTL and Dynesys. In this study, 12 patients were treated with Dynesys and 21 patients were treated with DTL. Back and leg pain were evaluated using the visual analog scale. The Oswestry Disability Index was used to evaluate the patients' function. Range of motion (ROM) at the operative level and for the whole lumbar spine was measured pre- and postoperatively. The length of wound, blood loss, length of hospital stay, and operation duration were also compared. All patients were followed up for 12-76 months. Scores on the visual analog scale and Oswestry Disability Index were significantly improved postoperatively. The median ROM of the whole spine and index level ROM in all patients showed 12.5% and 79.6% loss, respectively. The DTL group exhibited significantly better results in terms of blood loss, wound length, and operation duration, in addition to early ambulation. In conclusion, Dynesys and DTL are semirigid fixation systems that can significantly improve clinical symptoms and signs. Our results suggested that DTL was better than Dynesys as a result of it being a minimally invasive procedure. However, further study with large sample sizes and longer follow-up durations is required to validate the effects of these dynamic stabilizers.

  2. Dynesys dynamic stabilization-related facet arthrodesis.

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    Fay, Li-Yu; Chang, Peng-Yuan; Wu, Jau-Ching; Huang, Wen-Cheng; Wang, Chun-Hao; Tsai, Tzu-Yun; Tu, Tsung-Hsi; Chang, Hsuan-Kan; Wu, Ching-Lan; Cheng, Henrich

    2016-01-01

    OBJECTIVE Dynamic stabilization devices are designed to stabilize the spine while preserving some motion. However, there have been reports demonstrating limited motion at the instrumented level of the lumbar spine after Dynesys dynamic stabilization (DDS). The causes of this limited motion and its actual effects on outcomes after DDS remain elusive. In this study, the authors investigate the incidence of unintended facet arthrodesis after DDS and clinical outcomes. METHODS This retrospective study included 80 consecutive patients with 1- or 2-level lumbar spinal stenosis who underwent laminectomy and DDS. All medical records, radiological data, and clinical evaluations were analyzed. Imaging studies included pre- and postoperative radiographs, MR images, and CT scans. Clinical outcomes were measured by a visual analog scale (VAS) for back and leg pain, the Oswestry Disability Index (ODI), and Japanese Orthopaedic Association (JOA) scores. Furthermore, all patients had undergone postoperative CT for the detection of unintended arthrodesis of the facets at the indexed level, and range of motion was measured on standing dynamic radiographs. RESULTS A total of 70 patients (87.5%) with a mean age of 64.0 years completed the minimum 24-month postoperative follow-up (mean duration 29.9 months). Unintended facet arthrodesis at the DDS instrumented level was demonstrated by CT in 38 (54.3%) of the 70 patients. The mean age of patients who had facet arthrodesis was 9.8 years greater than that of the patients who did not (68.3 vs 58.5 years, p = 0.009). There were no significant differences in clinical outcomes, including VAS back and leg pain, ODI, and JOA scores between patients with and without the unintended facet arthrodesis. Furthermore, those patients older than 60 years were more likely to have unintended facet arthrodesis (OR 12.42) and immobile spinal segments (OR 2.96) after DDS. Regardless of whether unintended facet arthrodesis was present or not, clinical

  3. Dynamic simulation of universal spacer in Dynesys dynamic stabilization system for human vertebra

    Institute of Scientific and Technical Information of China (English)

    Sung-Min KIM; In-Chul YANG; Seung-Yeol LEE; Sung-Youn CHO

    2009-01-01

    The aim of this study is to analyze the simulated behavior of universal spacer in Dynesys dynamic stabilization system inserted in human vertebra. Dynesys, so-called "Dynamic neutralization system for the spine", dynamic stabilization system is a new concept in the surgical treatment of lower back pain recently. Universal spacer used as flexible material is to stabilize the spine and the material property of universal spacer is polycarbonate urethane. Universal spacer may apply different kinematic behaviors at implanted level in vertebra. Spinal range of motion(SROM) of inter-vertebra with installed Dynesys dynamic stabilization system was studied using Adams+LifeMOD as simulation software package. The vertebra model was set up to closely resemble the in-vivo conditions. Inter-vertebra rotations were measured by post processor of Adams and compared with the intact values. SROMs of the flexion, extension, lateral bending, and axial rotation of human virtual models were measured, where three spinal fixation systems such as rigid system, Dynesys system, and fused system were installed. As a result, the value of SROM is decreased in flexion-extension and lateral bending when the spinal fixation system is implanted. The movement of Dynesys system is similar to that of intact model by allowing the movement of lumbar. This means that the Dynesys system is proved to be safe and effective in the treatment of unstable spinal condition.

  4. Comparison of the Dynesys Dynamic Stabilization System and Posterior Lumbar Interbody Fusion for Lumbar Degenerative Disease.

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    Yang Zhang

    Full Text Available There have been few studies comparing the clinical and radiographic outcomes between the Dynesys dynamic stabilization system and posterior lumbar interbody fusion (PLIF. The objective of this study is to compare the clinical and radiographic outcomes of Dynesys and PLIF for lumbar degenerative disease.Of 96 patients with lumbar degenerative disease included in this retrospectively analysis, 46 were treated with the Dynesys system and 50 underwent PLIF from July 2008 to March 2011. Clinical and radiographic outcomes were evaluated. We also evaluated the occurrence of radiographic and symptomatic adjacent segment degeneration (ASD.The mean follow-up time in the Dynesys group was 53.6 ± 5.3 months, while that in the PLIF group was 55.2 ± 6.8 months. At the final follow-up, the Oswestry disability index and visual analogue scale score were significantly improved in both groups. The range of motion (ROM of stabilized segments in Dynesys group decreased from 7.1 ± 2.2° to 4.9 ± 2.2° (P < 0.05, while that of in PLIF group decreased from 7.3 ± 2.3° to 0° (P < 0.05. The ROM of the upper segments increased significantly in both groups at the final follow-up, the ROM was higher in the PLIF group. There were significantly more radiographic ASDs in the PLIF group than in the Dynesys group. The incidence of complications was comparable between groups.Both Dynesys and PLIF can improve the clinical outcomes for lumbar degenerative disease. Compared to PLIF, Dynesys stabilization partially preserves the ROM of the stabilized segments, limits hypermobility in the upper adjacent segment, and may prevent the occurrence of ASD.

  5. Dynesys dynamic stabilization: less good outcome than lumbar fusion at 4-year follow-up.

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    Haddad, Behrooz; Makki, Daoud; Konan, Sujith; Park, Derek; Khan, Wasim; Okafor, Ben

    2013-02-01

    Dynamic semirigid stabilization of the lumbar spine was introduced in 1994 in an attempt to overcome the drawbacks of fusion. It is supposed to preserve motion at the treated levels, while avoiding hypermobility and thus spondylosis at the adjacent levels. Although the early reports showed promising results, the long term effects are still debated. We retrospectively compared outcomes of Dynesys dynamic stabilization with those of the traditional fusion technique. Thirty-two patients who had undergone Dynesys between 2004 and 2006 (group 1) were compared to 32 patients who had been treated with fusion between 2005 and 2006 (group 2). VAS for back and leg pain, and ODI improved significantly in both groups (p < 0.001). These scores were all better in the fusion group, and even significantly so as far as VAS for back pain was concerned (p = 0.014). Similarly, more patients were satisfied or very satisfied after fusion than after Dynesys: 87.5% versus 68.8% (p = 0.04). Interestingly, in the Dynesys group scatter plot graphs showed a positive correlation between older age and improvement in the two VAS scores and in ODI. Dynamic stabilization with Dynesys remains controversial. Older patients are relatively more satisfied about it, probably because of their low level of demands.

  6. Dynesys 动态固定系统与腰椎相邻节段退变的研究进展%Research progress of Dynesys dynamic stabilization system and lumbar adjacent segment degeneration

    Institute of Scientific and Technical Information of China (English)

    张阳; 李放

    2013-01-01

      In recent years, the lumbar non-fusion technique remains a hot research topic in spine surgery, and the Dynesys dynamic stabilization system is one of the most widely applied non-fusion techniques clinically. The system is designed to stabilize the operated segments and meanwhile preserve some mobility, so as to prevent the stress concentration of adjacent segments and relieve adjacent segment degeneration. Many clinical studies show that the Dynesys system could have satisfied clinical results, but at present there are still some controversies about the role of the Dynesys dynamic stabilization system in reducing adjacent segment degeneration. The biomechanical and clinical research about the role of the Dynesys system in preventing adjacent segment degeneration is reviewed in this article, to provide clinical evidence.

  7. Dynesys dynamic stabilization system for the lumbar degenerative disease: a preliminary report from China

    Institute of Scientific and Technical Information of China (English)

    LI Hai-peng; LI Fang; GUAN Kai; ZHAO Guang-ming; SHAN Jian-lin; SUN Tian-sheng

    2013-01-01

    Background Dynesys dynamic stabilization system was first implanted in patients in 1994,and introduced to China in 2007.Therefore,it was a new technique for Chinese orthopedics and hence necessary to collect clinical data about Dynesys in China.The objective of this study was to report the preliminary results of Dynesys for the lumbar degenerative disease in China.Methods Twenty-seven patients were treated with the Dynesys between July 2007 and January 2009.The diagnosis included degenerative spondylolisthesis (12 cases),degenerative spinal stenosis (nine cases),and lumbar intervertebral disc herniation (six cases).Back pain and leg pain were evaluated using 100-mm visual analog scales (VAS).The Oswestry Disability Index (ODI) was used to evaluate the patients' function.The intervertebral disc height and range of motion at the operative level were taken on radiographs.Results All the patients were followed-up,with an average of (22.40±4.23) months (range 15-32 months).VAS of back pain and leg pain were improved significantly (P <0.05) at follow-up.The ODI scores were reduced from (62.58±12.01)%preoperatively to (15.01±5.71)% at follow-up (P <0.05).The preoperative mean height of the intervertebral disc was (11.21±1.58) mm (range 8.5-13.8 mm) and mean was (10.10±1.78) mm (range 7.0-13.4 mm) at follow-up (P <0.05).The mean range of motion of the implanted segment was (6.00±1.79)° (range 2.5-9.3°) preoperatively and (5.47±1.27)°(range 2.9-7.8°) at follow-up (P=0.11).Conclusions The preliminary results of Dynesys for the lumbar degenerative disease in China are similar to the published results of other countries.It can significantly improve the clinic symptoms and preserved motion at the level of implantation.However,the long-term follow-up data need to be collected.

  8. K-Rod 动态稳定系统与 Dynesys 非融合系统在多节段腰椎退变中的近期疗效比较%Comparison of short-term clinical effect of K - Rod pedicle dynamic fixation system and Dynesys system for multiple segmental lumbar degeneration

    Institute of Scientific and Technical Information of China (English)

    谢雁春; 刘军; 于海龙; 陈语

    2015-01-01

    Objective To compare the short-term clinical effect of K-Rod pedicle dynamic fixation system and Dynesys system for multiple segmental lumbar degeneration. Methods From January 2010 to October 2012,60 patients with multiple segmental lumbar degeneration who were accepted K -Rod pedicle dynamic fixation system and Dynesys system were retrospectively reviewed.The 60 patients were divided into K - Rod group and fusion group,30 cases of patients with K - Rod pedicle dynamic fixation system who were accepted responsibility segmental decompression intervertebral fusion and internal fixation,degenerative segmental unfusion internal fixation.30 cases with Dynesys system who were accepted posterior decompression,discectomy and Dynesys unfusion internal fixation.Clinical assessments were based on comparion of Oswestry disability index score,visual analogous scale (VAS),postoperative lumbar hyperextension,hyperbend X-ray film lumbar ROM value (lumbar flexion mobility),average operation time, intraoperative blood loss,the average length of stay of two groups. Results All of 60 cases were achieved 12 to 24 months follow-up,compared to preoperative,the difference of Oswestry disability index score and visual analogous scale (VAS) for two groups were statistically significant,but the difference of Oswestry disability index score and visual analogous scale (VAS),average operation time,blood loss, the average length of stay(ALOS) between two groups were unstatistically significant. Conclusion In the treatment of multiple segmental lumbar degeneration,both K - Rod pedicle dynamic fixation system and Dynesys system can obtain satisfactory short-term clinical effect and have advantages of less intraoperative blood loss,shorter operation time,postoperative small effects on lumbar spine mobility.%目的:探讨比较 K-Rod 椎弓根动态稳定系统与 Dynesys 非融合系统在多节段腰椎退变的近期临床疗效。方法选择2010年1月至2012年10月于沈阳军

  9. Dynamic stabilization using the Dynesys system versus posterior lumbar interbody fusion for the treatment of degenerative lumbar spinal disease: a clinical and radiological outcomes-based meta-analysis.

    Science.gov (United States)

    Lee, Chang-Hyun; Jahng, Tae-Ahn; Hyun, Seung-Jae; Kim, Chi Heon; Park, Sung-Bae; Kim, Ki-Jeong; Chung, Chun Kee; Kim, Hyun-Jib; Lee, Soo-Eon

    2016-01-01

    OBJECTIVE The Dynesys, a pedicle-based dynamic stabilization (PDS) system, was introduced to overcome the drawbacks of fusion procedures. Nevertheless, the theoretical advantages of PDS over fusion have not been clearly confirmed. The aim of this study was to compare clinical and radiological outcomes of patients who underwent PDS using the Dynesys system with those who underwent posterior lumbar interbody fusion (PLIF). METHODS The authors searched PubMed, Embase, Web of Science, and the Cochrane Database. Studies that reported outcomes of patients who underwent PDS or PLIF for the treatment of degenerative lumbar spinal disease were included. The primary efficacy end points were perioperative outcomes. The secondary efficacy end points were changes in the Oswestry Disability Index (ODI) and back and leg pain visual analog scale (VAS) scores and in range of motion (ROM) at the treated and adjacent segments. A meta-analysis was performed to calculate weighted mean differences (WMDs), 95% confidence intervals, Q statistics, and I(2) values. Forest plots were constructed for each analysis group. RESULTS Of the 274 retrieved articles, 7 (which involved 506 participants [Dynesys, 250; PLIF, 256]) met the inclusion criteria. The Dynesys group showed a competitive advantage in mean surgery duration (20.73 minutes, 95% CI 8.76-32.70 minutes), blood loss (81.87 ml, 95% CI 45.11-118.63 ml), and length of hospital stay (1.32 days, 95% CI 0.23-2.41 days). Both the Dynesys and PLIF groups experienced improved ODI and VAS scores after 2 years of follow-up. Regarding the ODI and VAS scores, no statistically significant difference was noted according to surgical procedure (ODI: WMD 0.12, 95% CI -3.48 to 3.72; back pain VAS score: WMD -0.15; 95% CI -0.56 to 0.26; leg pain VAS score: WMD -0.07; 95% CI -0.47 to 0.32). The mean ROM at the adjacent segment increased in both groups, and there was no substantial difference between them (WMD 1.13; 95% CI -0.33 to 2.59). Although the

  10. The Effect of Lumbar Lordosis on Screw Loosening in Dynesys Dynamic Stabilization: Four-Year Follow-Up with Computed Tomography

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    Chao-Hung Kuo

    2015-01-01

    Full Text Available Introduction. This study aimed to evaluate the effects of Dynesys dynamic stabilization (DDS on clinical and radiographic outcomes, including spinal pelvic alignment. Method. Consecutive patients who underwent 1- or 2-level DDS for lumbar spondylosis, mild degenerative spondylolisthesis, or degenerative disc disease were included. Clinical outcomes were evaluated by Visual Analogue Scale for back and leg pain, Oswestry Disability Index, and the Japanese Orthopedic Association scores. Radiographic outcomes were assessed by radiographs and computed tomography. Pelvic incidence and lumbar lordosis (LL were also compared. Results. In 206 patients with an average follow-up of 51.1 ± 20.8 months, there were 87 screws (8.2% in 42 patients (20.4% that were loose. All clinical outcomes improved at each time point after operation. Patients with loosened screws were 45 years older. Furthermore, there was a higher risk of screw loosening in DDS involving S1, and these patients were more likely to have loosened screws if the LL failed to increase after the operation. Conclusions. The DDS screw loosening rate was overall 8.2% per screw and 20.4% per patient at more than 4 years of follow-up. Older patients, S1 involvement, and those patients who failed to gain LL postoperatively were at higher risk of screw loosening.

  11. The Effect of Lumbar Lordosis on Screw Loosening in Dynesys Dynamic Stabilization: Four-Year Follow-Up with Computed Tomography.

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    Kuo, Chao-Hung; Chang, Peng-Yuan; Tu, Tsung-Hsi; Fay, Li-Yu; Chang, Hsuan-Kan; Wu, Jau-Ching; Huang, Wen-Cheng; Cheng, Henrich

    2015-01-01

    This study aimed to evaluate the effects of Dynesys dynamic stabilization (DDS) on clinical and radiographic outcomes, including spinal pelvic alignment. Consecutive patients who underwent 1- or 2-level DDS for lumbar spondylosis, mild degenerative spondylolisthesis, or degenerative disc disease were included. Clinical outcomes were evaluated by Visual Analogue Scale for back and leg pain, Oswestry Disability Index, and the Japanese Orthopedic Association scores. Radiographic outcomes were assessed by radiographs and computed tomography. Pelvic incidence and lumbar lordosis (LL) were also compared. In 206 patients with an average follow-up of 51.1 ± 20.8 months, there were 87 screws (8.2%) in 42 patients (20.4%) that were loose. All clinical outcomes improved at each time point after operation. Patients with loosened screws were 45 years older. Furthermore, there was a higher risk of screw loosening in DDS involving S1, and these patients were more likely to have loosened screws if the LL failed to increase after the operation. The DDS screw loosening rate was overall 8.2% per screw and 20.4% per patient at more than 4 years of follow-up. Older patients, S1 involvement, and those patients who failed to gain LL postoperatively were at higher risk of screw loosening.

  12. Dynesys dynamic neutralization system for the treatment of lumbar degenerative disease and the effect on the adjacent segment%Dynesys系统治疗腰椎退行性疾病对邻近节段的影响**☆

    Institute of Scientific and Technical Information of China (English)

    杨波; 万盛钰; 曾勉东; 吕玉明; 方世兵; 谢景开

    2013-01-01

      背景:大多数文献报道Dynesys动态中和稳定系统在治疗腰椎退行性疾病中取得了较好的临床疗效,但能否防止邻近节段退行性病变发生仍然存在争议。  目的:观察Dynesys系统治疗腰椎退行性疾病的临床疗效及对邻近节段的影响。  方法:自2009年3月至2012年10月收治20例腰椎退行性疾病患者,均采用手术减压加Dynesys系统动态固定治疗。Dynesys动态系统由Zimmer公司提供,由钛合金椎弓根螺钉、聚氨基甲酸乙酯套管和聚对苯二甲酸乙酯绳索组成。以目测类比评分、Oswestry 功能障碍指数进行临床疗效评价;依照Woodend评分评估邻近椎间盘退变程度;治疗有效率按Macnab标准评价。  结果与结论:20例患者全部获得随访,时间22-31个月。临床疗效按Macnab标准评价:优11例,良6例,可3例,优良率达85%。末次随访时,患者目测类比评分显著低于治疗前[(2.25±1.67)分,(8.29±1.50)分,P0.05)。提示Dynesys系统动态固定治疗腰椎退变性疾病早期疗效确切,长期疗效及其防止或延缓邻近节段退变的作用尚需多中心随机对照临床试验来证实。%BACKGROUND:Numerous studies show Dynesys dynamic neutralization system has achieved good clinical efficacy in the treatment of lumbar degenerative disease. But whether Dynesys dynamic neutralization system can prevent the adjacent segment degenerative disease is stil controversial. OBJECTIVE:To investigate the efficacy of the Dynesys system for the treatment of lumbar degenerative disease and impact on adjacent segments. METHODS:From March 2009 to October 2012, 20 consecutive patients with lumbar degenerative disease were included in this study. Al the patients were treated with surgical decompression plus Dynesys system dynamic fixation. The Dynesys system was provided by Zimmer Company, and composed with titanium al oy pedicle screws, polyurethane sleeve and

  13. In Vitro Comparison of Dynesys, PEEK, and Titanium Constructs in the Lumbar Spine

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    Matthew S. Yeager

    2015-01-01

    Full Text Available Introduction. Pedicle based posterior dynamic stabilization systems aim to stabilize the pathologic spine while also allowing sufficient motion to mitigate adjacent level effects. Two flexible constructs that have been proposed to act in such a manner, the Dynesys Dynamic Stabilization System and PEEK rod, have yet to be directly compared in vitro to a rigid Titanium rod. Methods. Human lumbar specimens were tested in flexion extension, lateral bending, and axial torsion to evaluate the following conditions at L4-L5: Intact, Dynesys, PEEK rod, Titanium rod, and Destabilized. Intervertebral range of motion, interpedicular travel, and interpedicular displacement metrics were evaluated from 3rd-cycle data using an optoelectric tracking system. Results. Statistically significant decreases in ROM compared to Intact and Destabilized conditions were detected for the instrumented conditions during flexion extension and lateral bending. AT ROM was significantly less than Destabilized but not the Intact condition. Similar trends were found for interpedicular displacement in all modes of loading; however, interpedicular travel trends were less consistent. More importantly, no metrics under any mode of loading revealed significant differences between Dynesys, PEEK, and Titanium. Conclusion. The results of this study support previous findings that Dynesys and PEEK constructs behave similarly to a Titanium rod in vitro.

  14. Dynesys动态稳定系统置入内固定与后路腰椎间融合修复腰椎退行性病的比较%Dynesys dynamic stabilization system versus posterior lumbar interbody fusion in treatment of lumbar degenerative disease

    Institute of Scientific and Technical Information of China (English)

    彭超; 何智勇; 母建松; 兰海; 李开南

    2014-01-01

    背景:后路腰椎椎体间融合是腰椎退行性疾病经典的治疗方法,目前大量研究表明,融合固定后的相邻节段会发生退变。近年来越来越多的学者关注脊柱的非融合固定技术发展。  目的:比较Dynesys动态稳定系统置入内固定和后路腰椎椎体间融合治疗腰椎退行性疾病的临床疗效。  方法:对2009年7月至2010年7月收治的56例退行性腰椎间盘疾病患者的临床资料进行回顾性对比分析,其中采用Dynesys动态稳定系统置入内固定治疗28例,采用后路腰椎椎体间融合治疗28例。比较两组患者的手术时间、出血量、治疗后住院时间,应用目测类比评分进行疼痛评估,以Oswestry功能评分评价临床疗效。  结果与结论:56例患者均获随访,随访时间18-24个月。两组患者治疗后12个月随访时的Oswestry功能评分、目测类比评分均较治疗前有明显改善(P OBJECTIVE:To compare clinical effects of Dynesys dynamic stabilization system fixation and posterior lumbar interbody fusion in treatment of lumbar degenerative disease. METHODS:From July 2009 to July 2011, clinical data of 56 patients with lumbar degenerative disease were retrospectively analyzed. There were 28 cases of Dynesys dynamic stabilization system fixation, and 28 cases of posterior lumbar interbody fusion. Operation time, bleeding volume, and postoperative hospitalization time were compared in both groups. Visual analog scale was used to assess pain. Oswestry disability index was utilized to evaluate clinical effects. RESULTS AND CONCLUSION:A total of 56 patients were fol owed up for 18-24 months. Visual analog scale and Oswestry disability index scores were significantly improved at 12 months after treatment in both groups (P<0.01). Significant differences in operation time, bleeding volume, and postoperative hospitalization time were detected between both groups (P<0.01). Dynesys dynamic

  15. Continuous clinical observation of the Dynesys dynamic neutralization system for degenerative lumbar spine diseases%Dynesys动态稳定系统治疗下腰椎疾病效果观察

    Institute of Scientific and Technical Information of China (English)

    刘先哲; 许伟华; 叶树楠; 冯勇; 张波; 杨述华

    2013-01-01

    Objective To evaluate the clinical indications and outcomes of dynesys neutralization system in the treatment of degenerative lumbar diseases.Methods From January 2007 to December 2011,102 consecutive patients with degenerative lumbar spine diseases underwent posterior decompression and internal fixation with the Dynesys dynamic neutralization system.Among them,69 patients were followed up,including 39 males and 30 females,aged from 30 to 62 years (average,44 years).The series of cases were composed of 24 cases of lumber disc herniation,35 cases of degenerative spinal stenosis,10 cases of degenerative changes of lumbar discs.Results The mean follow-up period was 35 months (range,6-44 months).The visual analogue scale (VAS) score decreased from preoperative 8.6 (range,6-9) to postoperative 2.8 (range,0-5),and the Oswestry disability index (ODI) improved from preoperative 73% (range,30%-91%) to postoperative 30% (range,0-61%).There were no implant failure or infection.According to the evaluation criteria of surgical treatment for low back pain,which was established by the Chinese Orthopaedic Association,the result was excellent in 53 patients,good in 12 patients,fair in 4 patients and poor in 1 patient.Conclusion The Dynesys dynamic neutralization system is effective in the treatment of degenerative lumbar spine disease,which can reserve the range of motion of stabilized segments,prevent degeneration of adjacent segments and improve clinical outcomes.%目的 探讨Dynesys动态稳定系统治疗腰椎退行性疾病的应用指征及安全性.方法 回顾性分析2007年1月至2011年12月采用后路减压+Dynesys动态内固定系统治疗102例腰椎退行性疾病患者中69例完整的随访资料,男39例,女30例;年龄30~62岁,平均44岁;单纯腰椎间盘突出24例,腰椎间盘突出并退行性椎管狭窄35例,椎间盘退行性改变10例.手术固定节段:L2,32例,L3,44例,L4,5 42例,L5S115例,L3~L5 5例,T12~L4 1

  16. Dynesys动态稳定系统治疗腰椎退行性疾病的短期临床疗效观察%Dynesys dynamic stability system treatment the short-term clinical effect of the treatment of lumbar degenerative disease

    Institute of Scientific and Technical Information of China (English)

    宁旭

    2014-01-01

    Objective:To retrospective analysis Dynesys dynamic stability system short-term clinical curative effect for the treatment of lumbar degener-ative disease.Methods:Collected in April 2011-April 2013 use Dynesys dynamic stability system treatment of the clinical data of 28 cases of lumbar degen-erative disease.Postoperative follow-up of 12 to 24 months,an average of 18.8 months.To observe the postoperative symptoms,compared preoperative VAS score,postoperative JOA scores and Oswestry scores,evaluate JOA postoperative period.Results:All cases of postoperative clinical symptoms im-proved significantly,the Dynesys screw loose rope without fracture,postoperative VAS score,Oswestry scores,preoperative JOA score difference statisti-cally (P<0.05),postoperative period JOA 68.2±3.66%.Conclusion:The treatment of lumbar degenerative disease Dynesys dynamic stability system short-term curative effect is satisfied,which get stability of lumbar spine and keep the function of lumbar spine lesions segment part activities at the same time. It is a kind of treatment of degenerative lumbar disease effective method of fusion elastic fixed,long-term clinical curative effect observation to be operation quantity and long-term follow-up.%目的:回顾分析Dynesys动态稳定系统治疗腰椎退行性疾病的短期临床疗效。方法:收集2011年4月-2013年4月使用Dynesys动态稳定系统治疗的腰椎退行性疾病28例临床资料。术后随访12-24个月,平均18.8个月。观察术后症状,比较术前术后 VAS评分、JOA评分以及 Oswestry评分,评估JOA术后改善率。结果:所有病例术后临床症状明显改善,Dynesys钉绳无松动断裂,术前术后 VAS评分、Oswestry评分、JOA评分具有统计学差异(P<0.05),JOA术后改善率68.2±3.66%。结论:Dynesys动态稳定系统治疗腰椎退行性疾病短期疗效满意,腰椎获得稳定性的同时,保留了腰椎病变节段部分活动功能,是一种治

  17. 减压结合动态稳定系统(Dynesys)治疗腰椎退行性病变的临床疗效观察%Efficacy of dynamic stabilization system(Dynesys)in addition to decompression for the treatment of lumbar degenerative disease

    Institute of Scientific and Technical Information of China (English)

    凌超; 关凯; 刘智

    2013-01-01

      背景:传统的脊柱融合术治疗腰椎退行性病变产生了越来越多的临床问题,在此背景下,多种非融合技术逐渐应用于临床。目的:评价减压结合动态稳定系统(dynamic neutralization system for the spine, Dynesys)治疗腰椎退行性病变的效果。方法:2008年7月至2011年8月应用后路减压术结合单节段Dynesys固定系统治疗腰椎退行性病变患者29例,评价指标包括VAS、ODI评分及椎间高度和椎间活动度。结果:27例患者获得随访,随访时间3~41个月,平均17.8个月。患者术后及末次随访VAS、ODI评分较术前评分均显著降低(P=0.001),术后及末次随访评分的差异无统计学意义(P>0.05)。术后手术节段(L4-L5和L5-S1)椎间隙高度较术前显著增大(P=0.009、P=0.001),术后各时间点差异无统计学意义(P>0.05)。术后椎间活动度较术前显著减小(P=0.001)。上下邻近节段椎间隙高度及椎间活动度术后较术前无明显变化(P>0.05)。结论:Dynesys后路动态稳定系统为腰椎退行性疾病治疗提供了更多的选择,其短期疗效满意,长期效果则需要大样本随机对照研究证实。%Background: More and more clinical affairs happened after traditional spinal fusion for lumbar degenerative diseases. So a variety of non-fusion technology has been applied gradually. Objective: To evaluate the clinical efficacy of the dynamic stabilization system (Dynesys) in the treatment of lumbar degen-erative diseases. Methods: From July 2008 toAugust 2011, 29 patients with lumbar degenerative diseases underwent decompression and dynam-ic stabilization with the Dynesys system. Clinical outcomes were evaluated by using ODI and VAS before and after surgery. Im-agingexaminations for intervertebralspace,surgicalsegmentalmovementandadjacentsegmentchangeswereobtained. Results: A total of 27 patients completed the final follow-up. The mean duration of

  18. Two microtubule-plus-end binding proteins LIS1-1 and LIS1-2, homologues of human LIS1 in Neurospora crassa.

    Science.gov (United States)

    Callejas-Negrete, Olga A; Plamann, Michael; Schnittker, Robert; Bartnicki-García, Salomon; Roberson, Robert W; Pimienta, Genaro; Mouriño-Pérez, Rosa R

    2015-09-01

    LIS1 is a microtubule (Mt) plus-end binding protein that interacts with the dynein/dynactin complex. In humans, LIS1 is required for proper nuclear and organelle migration during cell growth. Although gene duplication is absent from Neurospora crassa, we found two paralogues of human LIS1. We named them LIS1-1 and LIS1-2 and studied their dynamics and function by fluorescent tagging. At the protein level, LIS1-1 and LIS1-2 were very similar. Although, the characteristic coiled-coil motif was not present in LIS1-2. LIS1-1-GFP and LIS1-2-GFP showed the same cellular distribution and dynamics, but LIS1-2-GFP was less abundant. Both LIS1 proteins were found in the subapical region as single fluorescent particles traveling toward the cell apex, they accumulated in the apical dome forming prominent short filament-like structures, some of which traversed the Spitzenkörper (Spk). The fluorescent structures moved exclusively in anterograde fashion along straight paths suggesting they traveled on Mts. There was no effect in the filament behavior of LIS1-1-GFP in the Δlis1-2 mutant but the dynamics of LIS1-2-GFP was affected in the Δlis1-1 mutant. Microtubular integrity and the dynein-dynactin complex were necessary for the formation of filament-like structures of LIS1-1-GFP in the subapical and apical regions; however, conventional kinesin (KIN-1) was not. Deletion mutants showed that the lack of lis1-1 decreased cell growth by ∼75%; however, the lack of lis1-2 had no effect on growth. A Δlis1-1;Δlis1-2 double mutant showed slower growth than either single mutant. Conidia production was reduced but branching rate increased in Δlis1-1 and the Δlis1-1;Δlis1-2 double mutants. The absence of LIS1-1 had a strong effect on Mt organization and dynamics and indirectly affected nuclear and mitochondrial distribution. The absence of LIS1-1 filaments in dynein mutants (ropy mutants) or in benomyl treated hyphae indicates the strong association between this protein and the

  19. In vivo compatibility of Dynesys(®) spinal implants: a case series of five retrieved periprosthetic tissue samples and corresponding implants.

    Science.gov (United States)

    Neukamp, M; Roeder, C; Veruva, S Y; MacDonald, D W; Kurtz, S M; Steinbeck, M J

    2015-05-01

    To determine whether particulate debris is present in periprosthetic tissue from revised Dynesys(®) devices, and if present, elicits a biological tissue reaction. Five Dynesys(®) dynamic stabilization systems consisting of pedicle screws (Ti alloy), polycarbonate-urethane (PCU) spacers and a polyethylene-terephthalate (PET) cord were explanted for pain and screw loosening after a mean of 2.86 years (1.9-5.3 years). Optical microscopy and scanning electron microscopy were used to evaluate wear, deformation and surface damage, and attenuated total reflectance Fourier transform infrared spectroscopy to assess surface chemical composition of the spacers. Periprosthetic tissue morphology and wear debris were determined using light microscopy, and PCU and PET wear debris by polarized light microscopy. All implants had surface damage on the PCU spacers consistent with scratches and plastic deformation; 3 of 5 exhibited abrasive wear zones. In addition to fraying of the outer fibers of the PET cords in five implants, one case also evidenced cord fracture. The pedicle screws were unremarkable. Patient periprosthetic tissues around the three implants with visible PCU damage contained wear debris and a corresponding macrophage infiltration. For the patient revised for cord fracture, the tissues also contained large wear particles (>10 μm) and giant cells. Tissues from the other two patients showed comparable morphologies consisting of dense fibrous tissue with no inflammation or wear debris. This is the first study to evaluate wear accumulation and local tissue responses for explanted Dynesys(®) devices. Polymer wear debris and an associated foreign-body macrophage response were observed in three of five cases.

  20. 腰椎椎弓根动态内固定修复腰椎退行性疾病:K-Rod弹性棒、通用弹性棒及Dynesys系统比较%Dynamic lumbar pedicle fixation in repair of lumbar degenerative disease:K-Rod elastic rod, universal elastic rod and Dynesys system

    Institute of Scientific and Technical Information of China (English)

    刘涛; 王振江; 陈凡; 张大鹏; 郭宁国; 马方南; 冯纪川; 强晓军

    2014-01-01

    December 2012, 62 cases of lumbar spinal stenosis and lumbar disc herniation treated with lumbar dynamic system were included. The involved segments included:5 cases at L 3/4 , 20 cases at L 4/5 , 20 cases at L 5 S 1 , 6 cases at double segment L 3/4 and L 4/5, 8 cases at double segment L 4/5 , L 5 S 1 , 3 cases at L 3/4 and L 5 S 1 . There were 34 males and 28 females with an average age of 50.8 years (range 32 to 72 years). According to different fixation systems, they were assigned to three groups:general dynamic lumbar fixation system in 17 cases, K-Rod posterior dynamic stabilization system in 28 cases, and Dynesys system in 17 cases. The fol ow-up time was from 24 to 48 months. Evaluation indexes included visual analogue scale, Oswestry disability index, imaging analysis and excellent and good rate of curative effects. RESULTS AND CONCLUSION:Compared with before treatment, visual analogue scale score and Oswestry disability index were significantly improved at 6 months after treatment and final fol ow-up (P0.05). These data indicated that the lumbar dynamic system was an effective option for lumbar disc herniation and spinal stenosis. Although there are some differences in the structure of three kinds of flexible fixation, no obvious difference in early therapeutic effects was detected. Long-term effects deserve further investigations.

  1. Sistema de fixação dinâmica de coluna lombar Dynesys: experiência clínica em 30 pacientes num período médio de 1 ano Sistema Dynesis de fijación dinámica de la columna lumbar: la experiencia clínica en 30 pacientes en un período promedio de 1 año Dynesys system of dynamic fixation for the lumbar spine: clinical experience in 30 patients in an average period of 1 year

    Directory of Open Access Journals (Sweden)

    Paulo Rogério Costa de Sousa

    2012-01-01

    eran hombres y 11 mujeres con una edad promediode 40,11 años (22-56, nueve de ellos sometidos a abordaje de dos niveles adyacentes (L4 -L5 y L5-S1. La enfermedad tratada fue protrusión del disco en ocho casos, discopatía degenerativa en 16 casos y estenosis de canal en seis casos. El seguimiento se realizó en nivel de pacientes externos, variando desde 8 a 13 meses, con un promedio de 12,3, utilizando parámetros clínicos, escala analógica de dolor y Oswestry, así como notas dadas por los pacientes cuanto a la satisfacción con el procedimiento, mejora de la calidad de vida y vuelta a sus actividades laborales. RESULTADOS: El porcentaje de pacientes que alcanzó el pleno retorno a las actividades de trabajo fue 76,6% (21 pacientes en los primeros tres meses, y el resto retornó a trabajar hasta mediados del quinto mes. Se observó una mejoría significativa en el dolor lumbardemostrada por la disminución de la EVA (Preoperatorio: 8,6 y 12 meses; posoperatorio: 1,8. En cuanto a la calidad de vida, mejoró significativamente, siendo observada por la reducción de los índices de Oswestry (Preoperatorio: 68,6 y 12 meses; posoperatorio: 22,5. Todos los pacientes volvieron al trabajo después de seis meses de la operación. CONCLUSIÓN: Los resultados comprueban que el sistema dinámico ha demostrado ser eficaz en el tratamiento de enfermedades para las que se ha propuesto.OBJECTIVE: Using a new concept of dynamic stability instead of conventional fusion, in order to reproduce the results so far achieved by several services in Brazil and worldwide. METHODS: We evaluated 30 patients undergoing dynamic fixation of the lumbar spine. Nineteen were men and 11 women with a mean age of 40.11 years (22-56, nine of them needed two adjacent levels of stabilization (L4-L5 and L5-S1. The diseases being treated were disc protrusion in 8 cases, discopathy in 16 cases and degenerative spinal stenosis in 6 cases. Follow-up was done on an outpatient basis, ranging from 8 to 13

  2. Library and Information Science (LIS)

    DEFF Research Database (Denmark)

    Hjørland, Birger

    2017-01-01

    This article outlines the history of library and information science (LIS), from its roots in library science, information science and documentation. It considers various conceptions or “paradigms” in the field and discusses the topical content of LIS as well as the relationships between LIS...... and other disciplines. The main argument of the article is that answers to all such questions concerning LIS are related to conceptions of LIS. It is argued that an updated version of social epistemology (SE), which was founded by Egan and Shera in 1952, may in hindsight provide the most fruitful...

  3. Australian Library & Information Studies (LIS) Researchers Ranking of LIS Journals

    Science.gov (United States)

    Smith, Kerry; Middleton, Mike

    2009-01-01

    The paper describes the processes and outcomes of the ranking of LIS journal titles by Australia's LIS researchers during 2007-8, first through the Australian federal government's Research Quality Framework (RQF) process, and then by its replacement, the Excellence in Research for Australia (ERA) initiative. The requirement to rank the journals'…

  4. Facet joint changes after application of lumbar nonfusion dynamic stabilization.

    Science.gov (United States)

    Lee, Soo Eon; Jahng, Tae-Ahn; Kim, Hyun Jib

    2016-01-01

    OBJECTIVE The long-term effects on adjacent-segment pathology after nonfusion dynamic stabilization is unclear, and, in particular, changes at the adjacent facet joints have not been reported in a clinical study. This study aims to compare changes in the adjacent facet joints after lumbar spinal surgery. METHODS Patients who underwent monosegmental surgery at L4-5 with nonfusion dynamic stabilization using the Dynesys system (Dynesys group) or transforaminal lumbar interbody fusion with pedicle screw fixation (fusion group) were retrospectively compared. Facet joint degeneration was evaluated at each segment using the CT grading system. RESULTS The Dynesys group included 15 patients, while the fusion group included 22 patients. The preoperative facet joint degeneration CT grades were not different between the 2 groups. Compared with the preoperative CT grades, 1 side of the facet joints at L3-4 and L4-5 had significantly more degeneration in the Dynesys group. In the fusion group, significant facet joint degeneration developed on both sides at L2-3, L3-4, and L5-S1. The subjective back and leg pain scores were not different between the 2 groups during follow-up, but functional outcome based on the Oswestry Disability Index improved less in the fusion group than in the Dynesys group. CONCLUSIONS Nonfusion dynamic stabilization using the Dynesys system had a greater preventative effect on facet joint degeneration in comparison with that obtained using fusion surgery. The Dynesys system, however, resulted in facet joint degeneration at the instrumented segments and above. An improved physiological nonfusion dynamic stabilization system for lumbar spinal surgery should be developed.

  5. LIS Journals in the Knowledge Age.

    Science.gov (United States)

    Breen, Eileen

    This paper examines EMERALD LIS and how it facilitates the use of information contained in LIS (library and information science) journals for improvements and progress. EMERALD LIS is a full-text database of journals in information management, library technology, library and information service management, and collection management/development.…

  6. KM Education in LIS Programs

    Science.gov (United States)

    Rehman, Sajjad ur; Chaudhry, Abdus Sattar

    2005-01-01

    This paper investigates the perceptions of the heads of 12 Library and Information Science (LIS) schools on Knowledge Management (KM) education. These heads from North America, Europe and the Pacific region had either been offering KM courses or had an apparent interest in such programs. Data about perceptions were gathered on the nature of their…

  7. Library and Information Science (LIS Transferable Competencies

    Directory of Open Access Journals (Sweden)

    Melissa Fraser-Arnott

    2013-09-01

    Full Text Available This article uses data obtained from a content analysis of job advertisements to explore the questions of (1 what types of non-traditional jobs are available for library and information science (LIS professionals and (2 how can LIS students and professionals take advantage of non-traditional job opportunities. Two groups of job advertisements were used in this investigation: advertisements from LIS-targeted job boards (two library school job boards and two library association job boards and Government of Canada internal job postings. These two sets of job postings were selected to compare the competencies in job postings targeted to LIS graduates (the LIS job board advertisements and job postings that were not targeted to the LIS community (the Government of Canada job advertisements. An analysis of these groups of job advertisements demonstrated that both samples focused mainly on transferable competencies. Due to the emphasis on transferable competencies, the analysis of job postings from the Government of Canada job list revealed that there are many non-traditional opportunities for LIS graduates. A typical LIS professional could apply for 51 (or 25.8% of the job advertisements in this set, having met all of the listed criteria. This individual may be able to apply for an additional 40 (or 21.2% of the jobs listed if they had certain additional competencies or knowledge obtained through prior experience working in the Government of Canada but not necessarily obtained by the average LIS professional. This supports the argument that there are numerous opportunities for LIS professionals in non-traditional jobs. The exploration of commonly requested competencies can be used to guide LIS job seekers to craft their resumes and CVs to address the competencies requested by potential employers.

  8. Dynesys动态中和系统治疗腰椎退行性疾病的研究近况%Recent developments of Dynesys for lumbar degenerative diseases

    Institute of Scientific and Technical Information of China (English)

    刘园桐; 镇万新

    2015-01-01

    融合术后相邻节段退变(adjacent segment degeneration,ASDeg)或症状性相邻节段退变病(adjacent segment disease,ASDis)一直是脊柱外科医生争论的焦点.在此背景下,旨在保留节段运动及阻止邻近节段退变的非融合技术即动态稳定系统迅速发展.Dynesys动态中和系统(dynamic neutralization system,Dynesys)就是腰椎后路经椎弓根动态固定的代表之一,目前已历经20年的临床实践,在取得令人鼓舞的临床疗效的同时,也存在一些争议.本文主要对Dynesys的基础研究及临床经验作简要综述.

  9. Association of Lis1 with outer arm dynein is modulated in response to alterations in flagellar motility

    Science.gov (United States)

    Rompolas, Panteleimon; Patel-King, Ramila S.; King, Stephen M.

    2012-01-01

    The cytoplasmic dynein regulatory factor Lis1, which induces a persistent tight binding to microtubules and allows for transport of cargoes under high-load conditions, is also present in motile cilia/flagella. We observed that Lis1 levels in flagella of Chlamydomonas strains that exhibit defective motility due to mutation of various axonemal substructures were greatly enhanced compared with wild type; this increase was absolutely dependent on the presence within the flagellum of the outer arm dynein α heavy chain/light chain 5 thioredoxin unit. To assess whether cells might interpret defective motility as a “high-load environment,” we reduced the flagellar beat frequency of wild-type cells through enhanced viscous load and by reductive stress; both treatments resulted in increased levels of flagellar Lis1, which altered the intrinsic beat frequency of the trans flagellum. Differential extraction of Lis1 from wild-type and mutant axonemes suggests that the affinity of outer arm dynein for Lis1 is directly modulated. In cytoplasm, Lis1 localized to two punctate structures, one of which was located near the base of the flagella. These data reveal that the cell actively monitors motility and dynamically modulates flagellar levels of the dynein regulatory factor Lis1 in response to imposed alterations in beat parameters. PMID:22855525

  10. LIS education in developing countries the road ahead

    CERN Document Server

    Abdullahi, Ismail; Asundi, A Y

    2014-01-01

    The book contains relevant subjects and topics that address the future of LIS education in the developing world of Africa, Asia, and Latin America. Since last two decades the profile of LIS education, and their content are on the constant and persistent changes. LIS education is facing a fabulous task of managing and preparing future generation of library and information professionals.

  11. Academicism versus Professionalism in LIS Programs

    Science.gov (United States)

    Stortz, Martha

    2012-01-01

    The pedagogy of library and information science appears to be experiencing somewhat of an identity crisis. Many LIS graduate programs teach librarianship within both a theoretical, academic context, as well as a practical, work-based context. Core courses for the MLIS/MIS degree usually include statistics and research, as well as a course on…

  12. Changing Trends in LIS Job Advertisements

    Science.gov (United States)

    Wise, Sharyn; Henninger, Maureen; Kennan, Mary Anne

    2011-01-01

    The study reported in this paper is part of a larger program of studies designed to review and renew the curricula of Library and Information Science (LIS) and the broader Information Management (IM) courses. This paper analysed job advertisements as readily accessible indicators of the knowledge, skills, and competencies required of IPs by…

  13. Changing Trends in LIS Job Advertisements

    Science.gov (United States)

    Wise, Sharyn; Henninger, Maureen; Kennan, Mary Anne

    2011-01-01

    The study reported in this paper is part of a larger program of studies designed to review and renew the curricula of Library and Information Science (LIS) and the broader Information Management (IM) courses. This paper analysed job advertisements as readily accessible indicators of the knowledge, skills, and competencies required of IPs by…

  14. Water quality modelling of Lis River, Portugal.

    Science.gov (United States)

    Vieira, Judite; Fonseca, André; Vilar, Vítor J P; Boaventura, Rui A R; Botelho, Cidália M S

    2013-01-01

    The aim of the study was to predict the impact of flow conditions, discharges and tributaries on the water quality of Lis River using QUAL2Kw model. Calibration of the model was performed, based on data obtained in field surveys carried out in July 2004 and November 2006. Generally the model fitted quite well the experimental data. The results indicated a decrease of water quality in the downstream area of Lis River, after the confluence of Lena, Milagres and Amor tributaries, as a result of discharges of wastewaters containing degradable organics, nutrients and pathogenic organisms from cattle-raising wastewaters, domestic effluents and agricultural runoff. The water quality criteria were exceeded in these areas for dissolved oxygen, biochemical oxygen demand, total nitrogen and faecal coliforms. Water quality modelling in different scenarios showed that the impact of tributaries on the quality of Lis River water was quite negligible and mainly depends on discharges, which are responsible by an increase of almost 45, 13 and 44 % of ultimate carbonaceous biochemical oxygen demand (CBOD(u)), ammonium nitrogen and faecal coliforms, for winter simulation, and 23, 33 and 36 % for summer simulation, respectively, when compared to the real case scenario.

  15. Lis1 regulates dynein by sterically blocking its mechanochemical cycle.

    Science.gov (United States)

    Toropova, Katerina; Zou, Sirui; Roberts, Anthony J; Redwine, William B; Goodman, Brian S; Reck-Peterson, Samara L; Leschziner, Andres E

    2014-11-07

    Regulation of cytoplasmic dynein's motor activity is essential for diverse eukaryotic functions, including cell division, intracellular transport, and brain development. The dynein regulator Lis1 is known to keep dynein bound to microtubules; however, how this is accomplished mechanistically remains unknown. We have used three-dimensional electron microscopy, single-molecule imaging, biochemistry, and in vivo assays to help establish this mechanism. The three-dimensional structure of the dynein-Lis1 complex shows that binding of Lis1 to dynein's AAA+ ring sterically prevents dynein's main mechanical element, the 'linker', from completing its normal conformational cycle. Single-molecule experiments show that eliminating this block by shortening the linker to a point where it can physically bypass Lis1 renders single dynein motors insensitive to regulation by Lis1. Our data reveal that Lis1 keeps dynein in a persistent microtubule-bound state by directly blocking the progression of its mechanochemical cycle.

  16. Paperin lisäaineiden logistiset ratkaisut

    OpenAIRE

    Lindblom, Lari

    2016-01-01

    Tämän opinnäytetyön tarkoituksena oli löytää parannuskeinoja BillerudKorsnäsin Pietarsaaren paperitehtaan märkälujaliiman hankintaan, sekä pohtia gammaliimasäiliön investointia. Työtä varten tutustuttiin logistiikasta, tilaus- ja toimitusketjun hallinnasta sekä vendor managed inventorysta kertovaan kirjallisuuteen. Lisäksi haastateltiin tehtaan päivämestaria, joka on vastuussa tehtaalla käytettävien kemikaalien tilauksesta. Märkälujaliiman hankinnan parantamiseen parhaaksi keinoksi aja...

  17. Regulation of Cytoplasmic Dynein ATPase by Lis1

    Science.gov (United States)

    Mesngon, Mariano T.; Tarricone, Cataldo; Hebbar, Sachin; Guillotte, Aimee M.; Schmitt, E. William; Lanier, Lorene; Musacchio, Andrea; King, Stephen J.; Smith, Deanna S.

    2015-01-01

    Mutations in Lis1 cause classical lissencephaly, a developmental brain abnormality characterized by defects in neuronal positioning. Over the last decade, a clear link has been forged between Lis1 and the microtubule motor cytoplasmic dynein. Substantial evidence indicates that Lis1 functions in a highly conserved pathway with dynein to regulate neuronal migration and other motile events. Yeast two-hybrid studies predict that Lis1 binds directly to dynein heavy chains (Sasaki et al., 2000; Tai et al., 2002), but the mechanistic significance of this interaction is not well understood. We now report that recombinant Lis1 binds to native brain dynein and significantly increases the microtubule-stimulated enzymatic activity of dynein in vitro. Lis1 does this without increasing the proportion of dynein that binds to microtubules, indicating that Lis1 influences enzymatic activity rather than microtubule association. Dynein stimulation in vitro is not a generic feature of microtubule-associated proteins, because tau did not stimulate dynein. To our knowledge, this is the first indication that Lis1 or any other factor directly modulates the enzymatic activity of cytoplasmic dynein. Lis1 must be able to homodimerize to stimulate dynein, because a C-terminal fragment (containing the dynein interaction site but missing the self-association domain) was unable to stimulate dynein. Binding and colocalization studies indicate that Lis1 does not interact with all dynein complexes found in the brain. We propose a model in which Lis1 stimulates the activity of a subset of motors, which could be particularly important during neuronal migration and long-distance axonal transport. PMID:16481446

  18. Electrocatalysis in Li-S batteries

    Science.gov (United States)

    Al salem, Hesham I. A.

    Stabilizing polysulfide-shuttle process while ensuring high sulfur loading holds the key to realize high theoretical energy density (2500 Wh/kg) of lithium-sulfur (Li-S) batteries. Though several carbon based porous materials have been used as host structures for sulfur and its intermediate polysulfides, the week adsorption of polysulfides on carbon surface and its poor reaction kinetics limits them from practical application. Here, we preset a novel electcatalysis approach to stabilize polysulfide shuttle process and also enhance its red-ox kinetics. As a proof of concept, we have studied in-detail using conventional electrocatalyst (Pt/graphene composite), further the same extended to cost-effective electrocatalysts such as WS2 nanosheets and Metal carbides for viable practical applications. Nature of electrocatalyst, concentration of polysulfides and temperature of the cell on electrochemical properties will be discussed. We reveal substantial improvement in electrochemical properties such as specific capacity, rate capability, and coulombic efficiency and corroborate our findings with systematic experimental studies. Interaction between electrocatalyst and polysulfides has been evaluated by conducting X-ray photoelectron spectroscopy and electron microscopy studies at various electrochemical conditions. As a conclusion, introducing a catalyst in the Li-S system will open a new avenue for improving electrochemical performance.

  19. Quo Vadis? LIS Postgraduate Education in the Philippines

    Science.gov (United States)

    Dizon, Fernan R.; Sagun, Karryl Kim A.; Alfiler-Macalalad, Ana Grace P.

    2011-01-01

    The paper intends to shed light on the predicament faced by many Filipino. Librarians: the lack of local institutions offering a library and information science (LIS) postgraduate degree. The paper aims to reveal the state of Philippine LIS postgraduate education by considering the number of librarians who have pursued and are still pursuing…

  20. Transgression or Stasis? Challenging Foucault in LIS Theory

    Science.gov (United States)

    Buschman, John

    2007-01-01

    Michel Foucault (1926-84) is a primary thinker informing the construction of a critical theory of library and information science (LIS), or librarianship. He is widely cited and is adapted in various ways that focus on LIS forms of power, discourse, and so on. Others have addressed Foucault's topics, but he remains central. Librarianship has taken…

  1. Diversified Research Methods Education in LIS: Thinking outside the Box

    Science.gov (United States)

    Luo, Lili

    2017-01-01

    A small number of LIS degree programs have adopted a diversified approach to research methods education, including offering an array of specialized research methods courses in addition to a general introductory course. The current study conducted an in-depth investigation of the diversified research methods curriculum of the LIS program at San…

  2. Transgression or Stasis? Challenging Foucault in LIS Theory

    Science.gov (United States)

    Buschman, John

    2007-01-01

    Michel Foucault (1926-84) is a primary thinker informing the construction of a critical theory of library and information science (LIS), or librarianship. He is widely cited and is adapted in various ways that focus on LIS forms of power, discourse, and so on. Others have addressed Foucault's topics, but he remains central. Librarianship has taken…

  3. Rahvusvaheline Välis-Balti arhiivikonverents / Birgit Kibal

    Index Scriptorium Estoniae

    Kibal, Birgit

    2007-01-01

    27.-30. juunini 2006. aastal Tartus toimunud Välis-Balti arhiivikonverentsist (International ConFerence on the Baltic Archives Abroad). VEMU ehk Välis-Eesti muuseumi väljaarendamise mõttest. Ülevaade konverentsil peetud ettekannetest

  4. LIS1 Lissencephaly gene CNS expression: Relation to neuronal migration

    Energy Technology Data Exchange (ETDEWEB)

    Reiner, O. [Weizmann Institute of Science, Rehovot (Israel)]|[Baylor College of Medicine, Houston, TX (United States); Gal-Gerber, O.; Sapir, T. [Weizmann Institute of Science, Rehovot (Israel)] [and others

    1994-09-01

    Lis1 is the murine gene corresponding to human LIS1 gene involved in Miller-Dieker lissencephaly located on chromosome 17p13.3 as demonstrated by cDNA cloning, sequence analysis and genetic mapping. Lis1 expression was studied in developing mouse brain using in situ hybridization. At embryonic day 15, Lis1 expression was most prominently localized in the neuronal layer of the retina, the developing hippocampus, doral root ganglia, cranial ganglia and the thalamus. At postnatal day 5 a unique pattern of expression was detected in the developing cerebellum. Lis1 was expressed at high levels in the Purkinje cell layer when the granule cells were migrating through the Purkinje cell layer inwards. The expression of Lis1 in Purkinje cells in the adult is markedly reduced. Similarly, Lis1 was expressed in the ontogenetically older layers of the neocortex (layers 5 and 6) where younger neurons have to migrate through to settle in the superficial layers. Thus, at both sites a link between expression and neuronal migration was demonstrated. These studies on the expression pattern of Lis1 could be useful in understanding abnormalities in Miller-Dieker lissencephaly syndrome (MDS) patients.

  5. HIV-1 Tat interacts with LIS1 protein

    Directory of Open Access Journals (Sweden)

    Turner Willie

    2005-02-01

    Full Text Available Abstract Background HIV-1 Tat activates transcription of HIV-1 viral genes by inducing phosphorylation of the C-terminal domain (CTD of RNA polymerase II (RNAPII. Tat can also disturb cellular metabolism by inhibiting proliferation of antigen-specific T lymphocytes and by inducing cellular apoptosis. Tat-induced apoptosis of T-cells is attributed, in part, to the distortion of microtubules polymerization. LIS1 is a microtubule-associated protein that facilitates microtubule polymerization. Results We identified here LIS1 as a Tat-interacting protein during extensive biochemical fractionation of T-cell extracts. We found several proteins to co-purify with a Tat-associated RNAPII CTD kinase activity including LIS1, CDK7, cyclin H, and MAT1. Tat interacted with LIS1 but not with CDK7, cyclin H or MAT1 in vitro. LIS1 also co-immunoprecipitated with Tat expressed in HeLa cells. Further, LIS1 interacted with Tat in a yeast two-hybrid system. Conclusion Our results indicate that Tat interacts with LIS1 in vitro and in vivo and that this interaction might contribute to the effect of Tat on microtubule formation.

  6. The many faces of practice theory in LIS

    DEFF Research Database (Denmark)

    Pilerot, Ola; Hammarfelt, Björn; Moring, Camilla Elisabeth

    2017-01-01

    , a selection of prominent characteristics were identified. These characteristics provided guidance for the close-reading of the sample of practice-oriented LIS literature. As well as indicating direction for the qualitative analysis, the outcomes of the bibliometric study were recontexualized...... of a selection of practice-oriented contributions to the LIS literature. A bibliometric study of publications relating to “practice theory” provided a complementary quantitative overview of the influence of “the practice turn” in LIS. Analysis: Through reading a number of introductions to practice theories...

  7. The many faces of practice theory in LIS

    DEFF Research Database (Denmark)

    Pilerot, Ola; Hammarfelt, Björn; Moring, Camilla Elisabeth

    2017-01-01

    Introduction: This paper presents an exploration of how the notion of ”practice” is theorized and applied in library and information studies (LIS). Method:To highlight how “practice” is conceptualized and to discern what methodological approaches are taken, a qualitative analysis was conducted...... of a selection of practice-oriented contributions to the LIS literature. A bibliometric study of publications relating to “practice theory” provided a complementary quantitative overview of the influence of “the practice turn” in LIS. Analysis: Through reading a number of introductions to practice theories...... by the qualitative study. Results: The practice-oriented LIS literature can be divided into four different areas based on disciplinary influences. Authors are highlighting different key tenets when adhering to practice theory. It is possible to identify at least four different methodological approaches to empirical...

  8. LIS格式成像测井数据面向对象解析方法%Object-oriented analytical method of LIS format imaging logging data

    Institute of Scientific and Technical Information of China (English)

    张涌清; 张群会

    2013-01-01

    The format of the imaging logging data record was various greatly. This paper studied the LIS format of the imaging logging data, based on the introduction of the data format commonly used in industry. Through the analysis of logical and physical structure of the LIS format,based on the mapping mechanism of logical structure and physical structure, parsed the file format and data format of LIS using the object-oriented method. This paper constructed the foundation class library of LIS in the form of a dynamic-link library adopting Visual C+ + 2010 as the tool,and designed the LisViewer system on the basis of such libraries to visually show the data and structure of LIS, with good results.%成像测井数据的记录格式千差万别,在对行业中普遍采用的数据格式介绍的基础上,文中对测井数据的LIS格式进行了研究.通过分析LIS格式的逻辑结构和物理结构,在逻辑结构与物理结构映射机制的基础上,采用面向对象的思想对LIS格式的文件格式和数据格式进行了解析.通过Visual C++2010以动态连接库的形式构造了LIS数据解析的基础类库,并在此类库的基础上设计了一套LisViewer系统,直观地显示了LIS文件中的数据和结构,取得了较好的效果.

  9. Tuotemyynnin lisääminen projektipainotteisessa liiketoiminnassa

    OpenAIRE

    Hoskonen, Pekka

    2013-01-01

    Tämän opinnäytetyön aihe oli tuotemyynnin lisääminen projektipainotteisessa liiketoiminnassa. Työn tavoitteena oli selvittää mitä muutoksia organisaation tulisi tehdä jos yritys haluaa panostaa tuotemyyntiin entistä enemmän. Kohdeyritys toimii hyvin kilpaillulla, kansainvälisellä alalla. Suuri osa yrityksen liikevaihdosta kertyi projektien ja niihin liittyvien palveluiden myynnistä ja tuotemyynnin lisääminen nähtiin potentiaalisena kasvun paikkana. Teoriaosuudessa käsiteltiin projektiorga...

  10. Challenges and Concerns for Library and Information Science (LIS) Education in India and South Asia

    Science.gov (United States)

    Kaur, Trishanjit

    2015-01-01

    This paper presents some of the challenges and concerns for library and information science (LIS) education in India. In order to provide context for these challenges, the paper begins with a brief overview of higher education in India in general and then discusses the beginning of LIS education. It briefly summarizes LIS education in South Asia…

  11. Enabling Gender-Inclusivity in LIS Education through Epistemology, Ethics, and Essential Questions

    Science.gov (United States)

    Fox, Melodie J.

    2014-01-01

    Epistemology, or the study of knowledge and knowing, is foundational for Library and Information Science (LIS) programs, as the recognition of different conceptions of how people "know" can help LIS professions handle diversity, especially gender diversity. The incorporation of epistemology can provide LIS students with more…

  12. Exploring the Benefits of KM Education for LIS Professionals

    Science.gov (United States)

    Hazeri, Afsaneh; Martin, Bill; Sarrafzadeh, Maryam

    2009-01-01

    It is to be expected that in a new and emerging discipline like knowledge management (KM) there still will be ambivalence among both LIS educational institutions and their students, as to the need to have KM courses. Investigating the benefits of engaging with these programs might help to clear up this ambiguity. The present paper seeks to shed…

  13. Testing Article Quality in LIS Journals: The Search Continues.

    Science.gov (United States)

    Calvert, Philip J.; Gorman, G. E.

    During the first half of 2000 a pilot project on library and information science (LIS) journal quality was undertaken in the Asian region for the International Federation of Library Associations and Institutions (IFLA) Round Table on Library and Information Science Journals (RTLISJ). It showed that a simple, but effective, methodology could be…

  14. Lis1/dynactin regulates metaphase spindle orientation in Drosophila neuroblasts

    Science.gov (United States)

    Siller, Karsten H.; Doe, Chris Q.

    2008-01-01

    Mitotic spindle orientation in polarized cells determines whether they divide symmetrically or asymmetrically. Moreover, regulated spindle orientation may be important for embryonic development, stem cell biology, and tumor growth. Drosophila neuroblasts align their spindle along an apical/basal cortical polarity axis to self-renew an apical neuroblast and generate a basal differentiating cell. It is unknown whether the spindle alignment requires both apical and basal cues, nor have molecular motors been identified that regulate spindle movement. Using live imaging of neuroblasts within intact larval brains, we detect independent movement of both apical and basal spindle poles, suggesting that forces act on both poles. We show that reducing astral microtubules decreases the frequency of spindle movement, but not its maximum velocity, suggesting that one or few microtubules can move the spindle. Mutants in the Lis1/dynactin complex strongly decrease maximum and average spindle velocity, consistent with this motor complex mediating spindle/cortex forces. Loss of either astral microtubules or Lis1/dynactin leads to spindle/cortical polarity alignment defects at metaphase, but these are rescued by telophase. We propose that an early Lis1/dynactin-dependent pathway and a late Lis1/dynactin-independent pathway regulate neuroblast spindle orientation. PMID:18485341

  15. Real Learning Connections: Questioning the Learner in the LIS Internship

    Science.gov (United States)

    Bird, Nora J.; Crumpton, Michael A.

    2014-01-01

    The focus of literature on the role of internship has been on whether and how such activity benefits the student. A model is proposed that examines what happens for both the practitioner supervisor and the LIS educator during an internship experience. Is it possible that all participants learn from the experience and how can that learning be…

  16. Land Information System (LIS) Development Plan: FY13-FY17

    Science.gov (United States)

    2013-10-01

    Fast All Season Soil Strength (FASST) model baseline integration and benchmarking within LIS The US Army FASST model ( Frankenstein and Keonig 2004) is...product using visible, microwave, and scatterometer satellite data. International Journal of Remote Sensing 32(5):1371–1395. Frankenstein , S., and G

  17. Potential Use of Augmented Reality in LIS Education

    Science.gov (United States)

    Wójcik, Magdalena

    2016-01-01

    The subject of this article is the use of augmented reality technology in library and information science education. The aim is to determine the scope and potential uses of augmented reality in the education of information professionals. In order to determine the scope and forms of potential use of AR technology in LIS education a two-step…

  18. Lisätty todellisuus mobiilipelinkehityksessä

    OpenAIRE

    2015-01-01

    Työn toimeksiantajana oli tamperelainen peli- ja ohjelmistoyritys Rimeforge Entertainment. Tavoitteena oli tarjota toimeksiantajalle kattava kuva lisätyn todellisuuden mahdollisuuksista mobiilipelinkehityksessä sekä toimia inspiroijana teknologian hyödyntämiseen. Tutkimuksen kohteeksi valittiin erityisesti Unity-pelinkehitysohjelmisto ja Vuforia-laajennus. Tarkoituksena oli perehtyä mahdollisimman monipuolisesti Vuforian eri ominaisuuksiin havainnollistavien esimerkkisovellusten avulla. R...

  19. Reference Materials in LIS Instruction: A Delphi Study

    Science.gov (United States)

    Rabina, Debbie

    2013-01-01

    This paper presents the results of a Delphi study conducted over a two-month period in 2011. The purpose of the study was to identify reference sources that should be covered in basic reference courses taught in LIS programs in the United States. The Delphi method was selected for its appropriateness in soliciting expert opinions and assessing the…

  20. Potential Use of Augmented Reality in LIS Education

    Science.gov (United States)

    Wójcik, Magdalena

    2016-01-01

    The subject of this article is the use of augmented reality technology in library and information science education. The aim is to determine the scope and potential uses of augmented reality in the education of information professionals. In order to determine the scope and forms of potential use of AR technology in LIS education a two-step…

  1. Structural features of the two-component system LisR/LisK suggests multiple responses for the adaptation and survival of Listeria monocytogenes

    Directory of Open Access Journals (Sweden)

    Nelson Enrique Arenas Suarez

    2013-08-01

    Full Text Available Here, we characterized the structure of the two-component regulatory system, LisR/LisK, in Listeria monocytogenes. To predict the structure of both proteins and the relationship between them, we employed several bioinformatic tools and databases. Based on our results, LisK protein is embedded in the cell membrane and its modular composition (HAMP, histidine kinase and ATPase domains is associated with its autophosphorylation (His-266. A stimulus-response likely determines the sequential signal propagation from the bacterial cell surface to its cytoplasmic components. According to our results, LisR is a cytoplasmic protein with a receptor domain (homologous to CheY that comprises a phosphoacceptor residue (Asp-52 and a DNA-binding domain, which may allow the transmission of a specific transcriptional response. LisR/LisK has been experimentally characterized both biochemically andfunctionally in other Bacilli pathophysiology; our structure-function approach may facilitate the design of suitable inhibitors.

  2. LIS Open Access E-Journal - where are you?

    Directory of Open Access Journals (Sweden)

    Izabella Taler

    2008-12-01

    Full Text Available Access to published information is of interest to many users. Library and Information Science (LIS professionals are especially interested in gaining access and guiding users to all available information. Though they are often dependent on traditional subscription-based library resources, moving away from the costly ones and replacing them with usage of available open access sources, presents practitioners with a significant budget consideration in today's shrinking economy. This paper examines the availability of current LIS open access e-journals; their presence in well- and less-well known abstracting and indexing sources, their inclusion in standard library bibliographic tools as well as coverage by Google Scholar, a computer generated search engine.

  3. ReLIS: Research Papers on Library and Information Science

    OpenAIRE

    Subirats-Coll, Imma; Barrueco, José-Manuel

    2002-01-01

    ReLIS is realtionated with the international tendencies of open archives of scientific Literature, which guarantees its quality, continuity and also extension possibility. ] applies to the philosophy harnessed by the Open Archives Initiative, and of its future products come from that, at the moment are in phase of study on the part of our equipment. OAI develop and promote the interoperability to facilitate the diffusion of contents, to offer the access to e-prints and to increase the communi...

  4. Global and Information and Communication Technology (ICT) Changes in Library and Information Studies (LIS): Information Seeking Behaviors of LIS Faculty Members in Thailand

    Science.gov (United States)

    Polparsi, Jomkwan

    2012-01-01

    This study provides an overview of Information and Communication Technology (ICT) in Library and Information Studies (LIS) education in Thailand, focusing on challenges and pressures in the information environment of Thai LIS faculty members. This study employed a qualitative research approach, naturalistic inquiry, and inductive data analysis.…

  5. Global Patterns of Lightning Properties Derived by OTD and LIS

    Science.gov (United States)

    Beirle, Steffen; Koshak, W.; Blakeslee, R.; Wagner, T.

    2014-01-01

    The satellite instruments Optical Transient Detector (OTD) and Lightning Imaging Sensor (LIS) provide unique empirical data about the frequency of lightning flashes around the globe (OTD), and the tropics (LIS), which 5 has been used before to compile a well received global climatology of flash rate densities. Here we present a statistical analysis of various additional lightning properties derived from OTD/LIS, i.e. the number of so-called "events" and "groups" per flash, as well as 10 the mean flash duration, footprint and radiance. These normalized quantities, which can be associated with the flash "strength", show consistent spatial patterns; most strikingly, oceanic flashes show higher values than continental flashes for all properties. Over land, regions with high (Eastern US) 15 and low (India) flash strength can be clearly identified. We discuss possible causes and implications of the observed regional differences. Although a direct quantitative interpretation of the investigated flash properties is difficult, the observed spatial patterns provide valuable information for the 20 interpretation and application of climatological flash rates. Due to the systematic regional variations of physical flash characteristics, viewing conditions, and/or measurement sensitivities, parametrisations of lightning NOx based on total flash rate densities alone are probably affected by regional biases.

  6. Global patterns of lightning properties derived by OTD and LIS

    Directory of Open Access Journals (Sweden)

    S. Beirle

    2014-04-01

    Full Text Available The satellite instruments Optical Transient Detector (OTD and Lightning Imaging Sensor (LIS provide unique empirical data about the frequency of lightning flashes around the globe (OTD, and the tropics (LIS, which have been used before to compile a well received global climatology of flash rate densities. Here we present a statistical analysis of various additional lightning properties derived from OTD/LIS, i.e. the number of so-called "events" and "groups" per flash, as well as the mean flash duration, footprint and radiance. These normalized quantities, which can be associated with the flash "strength", show consistent spatial patterns; most strikingly, oceanic flashes show higher values than continental flashes for all properties. Over land, regions with high (Eastern US and low (India flash strength can be clearly identified. We discuss possible causes and implications of the observed regional differences. Although a direct quantitative interpretation of the investigated flash properties is difficult, the observed spatial patterns provide valuable information for the interpretation and application of climatological flash rates. Due to the systematic regional variations of physical flash characteristics, viewing conditions, and/or measurement sensitivities, parametrisations of lightning NOx based on total flash rate densities alone are probably affected by regional biases.

  7. Lis1 regulates asymmetric division in hematopoietic stem cells and in leukemia

    Science.gov (United States)

    Zimdahl, Bryan; Ito, Takahiro; Blevins, Allen; Bajaj, Jeevisha; Konuma, Takaaki; Weeks, Joi; Koechlein, Claire S.; Kwon, Hyog Young; Arami, Omead; Rizzieri, David; Broome, H. Elizabeth; Chuah, Charles; Oehler, Vivian G.; Sasik, Roman; Hardiman, Gary; Reya, Tannishtha

    2014-01-01

    Cell fate can be controlled through asymmetric division and segregation of protein determinants. But the regulation of this process in the hematopoietic system is poorly understood. Here we show that the dynein binding protein Lis1 (Pafah1b1) is critically required for blood formation and hematopoietic stem cell function. Conditional deletion of Lis1 in the hematopoietic system led to a severe bloodless phenotype, depletion of the stem cell pool and embryonic lethality. Further, the loss of Lis1 accelerated cell differentiation, in part through defects in spindle positioning and inheritance of cell fate determinants. Finally, deletion of Lis1 blocked propagation of myeloid leukemia and led to a marked improvement in animal survival, suggesting that Lis1 is also required for oncogenic growth. These data identify a key role for Lis1 in hematopoietic stem cells, and mark the directed control of asymmetric division as a critical regulator of normal and malignant hematopoietic development. PMID:24487275

  8. Lisämyynti osana asiakaspalveluprosessia Sokos Hotel Ilveksessä

    OpenAIRE

    Pertilä, Anna-Maija; Iivonen, Virve

    2010-01-01

    Työn toimeksiantajana oli Sokos Hotel Ilves. Työn tavoitteena oli kehittää Sokos Hotel Ilveksen lisämyyntiä asiakkaan näkökulmasta. Tutkimuksen tavoitteena oli myös laatia tutkimustulosten pohjalta lisämyyntimalli, jossa kuvailtiin Sokos Hotel Ilveksen asiakaspalveluprosessin vaiheiden lisämyyntimahdollisuudet. Tavoitteiden saavuttamiseksi tutkittiin Sokos Hotel Ilveksessä yöpyneiden asiakkaiden mielipiteitä ja kokemuksia vastaanottovirkailijan suosittelusta sekä toimipaikkamainonnasta. ...

  9. The human LIS1 is downregulated in hepatocellular carcinoma and plays a tumor suppressor function

    Energy Technology Data Exchange (ETDEWEB)

    Xing, Zhen; Tang, Xin; Gao, Yuan; Da, Liang; Song, Hai; Wang, Suiquan [State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai (China); Tiollais, Pierre [Unite' d' Organisation Nucleaire et Oncogenese, INSERM U.579, Institut Pasteur, Paris (France); Li, Tsaiping [State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai (China); Zhao, Mujun, E-mail: mjzhao@sibs.ac.cn [State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai (China)

    2011-06-03

    Highlights: {yields} LIS1 mRNA and protein levels are decreased in 70% HCC tissues. {yields} Downregulation of LIS1 expression induces oncogenic transformation of QSG7701 and NIH3T3 cells in vitro and in vivo. {yields} LIS1 downregulation leads to mitotic errors including spindle and chromosome defects. {yields} Ectopic expression of LIS1 could significantly inhibit HCC cell proliferation and colony formation. {yields} Our results suggest that LIS1 plays a potential tumor suppressor role in the development and progression of HCC. -- Abstract: The human lissencephaly-1 gene (LIS1) is a disease gene responsible for Miller-Dieker lissencephaly syndrome (MDL). LIS1 gene is located in the region of chromosome 17p13.3 that is frequency deleted in MDL patients and in human liver cancer cells. However, the expression and significance of LIS1 in liver cancer remain unknown. Here, we investigated the expression of LIS1 in hepatocellular carcinoma (HCC) tissues by real-time PCR, Western blot, and immunohistochemistry. The results indicated that the mRNA and protein levels of LIS1 were downregulated in about 70% of HCC tissues, and this downregulation was significantly associated with tumor progression. Functional studies showed that the reduction of LIS1 expression in the normal human liver cell line QSG7701 or the mouse fibroblast cell line NIH3T3 by shRNA resulted in colony formation in soft agar and xenograft tumor formation in nude mice, demonstrating that a decrease in the LIS1 level can promote the oncogenic transformation of cells. We also observed that the phenotypes of LIS1-knockdown cells displayed various defective mitotic structures, suggesting that the mechanism by which reduced LIS1 levels results in tumorigenesis is associated with its role in mitosis. Furthermore, we demonstrated that ectopic expression of LIS1 could significantly inhibit HCC cell proliferation and colony formation. Our results suggest that LIS1 plays a potential tumor suppressor role in the

  10. The early clinical observation about Dynesys and lumbar interbody fusion in treatment of lumbar degenerative diseases%非融合技术与腰椎融合术治疗腰椎退变性疾病的早期疗效观察

    Institute of Scientific and Technical Information of China (English)

    王孟; 李坤; 王飞; 张元豫

    2012-01-01

    Objective To investigate the difference of early clinical efficacy between Dynesys and lumbar interbody fusion in treatment of lumbar degenerative diseases. Methods Clinical data of 36 patients under two methods treatment of lumbar degenerative diseases with 18 examples in each were retrospectively analyzed. Patients were observed blood loss, VAS, ODI index, the rate for short-term excellent or good relief of symptoms and ROM. Results Two groups of VAS and ODI index had been significantly improved; Dynesys group maintained adjacent segment ROM to its original condition, while instrumented segment ROM decreased; In lumbar interbody fusion group, adjacent segment ROM increased, and instrumented segments fused. Conclusions Dynesys and the lumbar interbody fusion can all take the ideal early curative effect. Dynesys preserve partial ROM ,and prevent accelerated degeneration, which is a desirable method of treatment.%目的 探讨Dynesys和腰椎融合治疗腰椎退行性疾病早期临床疗效.方法 采用两种方法治疗36例腰椎退行性疾病患者,Dynesys组18例,腰椎融合组18例.观察两组手术时间、术中出血量、VAS评分、ODI指数、手术效果优良率及椎间活动度(ROM).结果 两组术后VAS及ODI都得到明显改善;Dynesys组邻近节段ROM维持在原来状态,手术节段ROM减小;腰椎融合组邻近节段ROM增大,手术节段融合.结论 Dynesys与腰椎融合术均可取的理想的早期疗效,Dynesys保持了部分椎间活动度,有利于防止退变加速.

  11. Apply the irrigation and ground water access schemes into LIS Noah LSM to improve the ET fluxes in the riparian areas

    Science.gov (United States)

    Dong, J.; Toll, D.; Arsenault, K.; Ozdogan, M.; Mitchell, K.

    2008-05-01

    Evapotranspiration (ET) has been identified by U.S. Bureau of Reclamation, EPA and other agencies as a critical factor for determining water availability affecting various applications. The ET fluxes are the integrated responses to the weather, land surface properties, and soil water availability. Riparian regions are characterized with less precipitation and high temperature, but the ET fluxes are extremely high due to the groundwater access along the river and crop irrigation. Crop irrigation and depletions by riparian vegetation are the largest surface water uses in the Middle Rio Grande Basin, accounting for up to 90 percent of surface water withdrawals. It is impossible to retrieve the observed ET flux for land surface models at current forcing and model configurations. Therefore, the extra water sources are required in the modeling. We propose the following implementations to NASA Land Information System (LIS) Noah land surface model. For the irrigated crops we applied an irrigation scheme by artificially adding the irrigation rate to the precipitation. The irrigation rate is calculated from the water demand by crops. We accounted for the riparian deep water access by controlling the soil moisture in the bottom layer at the field capacity for the regions close to the river. Two LIS Noah simulations have been performed in parallel. One uses the NCEP default configuration, and the other uses the updated LIS configuration including the tiling consideration derived from U.S. Geological Survey (USGS) Landsat based 30m land cover map, MODIS greenness, crop irrigation scheme and groundwater access scheme. Both LIS Noah runs at 1km resolution start from January 1, 2005 with the initial conditions from the five- year spin-up runs. LIS Noah model has demonstrated the ability to reconstruct the observed ET fluxes in the riparian regions without changing the model dynamics and physics.

  12. Employment and Learning Outcomes of LIS Graduates: A Case of Pakistan

    Science.gov (United States)

    Warraich, Nosheen Fatima; Ameen, Kanwal

    2011-01-01

    This paper explores the perceptions of Library and Information Science (LIS) graduates about their learning outcomes in the Master of Library and Information Science (MLIS) programme at the University of the Punjab and their employment outcomes in the marketplace. Why do LIS graduates choose librarianship as a profession in Pakistan? What is their…

  13. Information Behaviors and Information Literacy Skills of LIS Students: An International Perspective

    Science.gov (United States)

    Saunders, Laura; Kurbanoglu, Serap; Boustany, Joumana; Dogan, Guleda; Becker, Peter; Blumer, Eliane; Chowdhury, Sudatta; Dobreva, Milena; Gendina, Natalia; Grgic, Ivana Hebrang; Haddow, Gaby; Koltay, Tibor; Kortelainen, Terttu; Krakowska, Monika; Majid, Shaheen; Mezhova, Marina; Repanovici, Angela; Rudžioniene, Jurgita; Schneider, Rene; Terra, Ana Lucia; Todorova, Tania Y.

    2015-01-01

    Librarians are expected to be expert searchers, and developing information literacy skills to navigate the vast world of information is a focus of most library and information science (LIS) programs. It is important to understand the information literacy and behaviors of LIS students to see if they are employing the skills they will need to assist…

  14. A Preliminary Study on the Curriculum Overlap and Gap between LIS Education and Intelligence Education

    Science.gov (United States)

    Wu, Yejun

    2013-01-01

    This paper addresses the curriculum overlap and gap between LIS education and intelligence education by analyzing the content of the websites of the intelligence education programs and courses in 27 representative intelligence education universities in the United States, and the intelligence-related programs and courses in the 56 LIS programs in…

  15. MOOCs as LIS Professional Development Platforms: Evaluating and Refining SJSU's First Not-for-Credit MOOC

    Science.gov (United States)

    Stephens, Michael; Jones, Kyle M. L.

    2014-01-01

    Beyond for-credit offerings, some library and information science (LIS) schools are exploring MOOCs as a means to promote lifelong learning and professional development. Using web surveys and descriptive content analysis methods, this paper empirically addresses if, in LIS programs, MOOCs can fill a role and serve new populations of learners…

  16. A flexible sulfur-graphene-polypropylene separator integrated electrode for advanced Li-S batteries.

    Science.gov (United States)

    Zhou, Guangmin; Li, Lu; Wang, Da-Wei; Shan, Xu-Yi; Pei, Songfeng; Li, Feng; Cheng, Hui-Ming

    2015-01-27

    A flexible Li-S battery based on an integrated structure of sulfur and graphene on a separator is developed. The internal graphene current collector offers a continuous conductive pathway, a modified interface with sulfur, and a good barrier to and an effective reservoir for dissolved polysulfides, consequently improving the capacity and cyclic life of the Li-S battery.

  17. Information Behaviors and Information Literacy Skills of LIS Students: An International Perspective

    Science.gov (United States)

    Saunders, Laura; Kurbanoglu, Serap; Boustany, Joumana; Dogan, Guleda; Becker, Peter; Blumer, Eliane; Chowdhury, Sudatta; Dobreva, Milena; Gendina, Natalia; Grgic, Ivana Hebrang; Haddow, Gaby; Koltay, Tibor; Kortelainen, Terttu; Krakowska, Monika; Majid, Shaheen; Mezhova, Marina; Repanovici, Angela; Rudžioniene, Jurgita; Schneider, Rene; Terra, Ana Lucia; Todorova, Tania Y.

    2015-01-01

    Librarians are expected to be expert searchers, and developing information literacy skills to navigate the vast world of information is a focus of most library and information science (LIS) programs. It is important to understand the information literacy and behaviors of LIS students to see if they are employing the skills they will need to assist…

  18. 后正中入路Dynesys置入对腰椎全椎板减压术后生理性稳定性的作用%Dynesys placement on lumbar spine stability during total lumbar laminectomy decompression via posterior midline approach

    Institute of Scientific and Technical Information of China (English)

    侯煜; 田少辉; 卜宏建; 冯建刚; 武士科; 李盼祥; 李志平; 尚爱加

    2015-01-01

    Objective To investigate the role of Dynesys placement on lumbar spine stability during the total lumbar laminectomy decompression for intraspinal schwannoma via posterior midline approach Methods 6 patients with lumbar intraspinal schwannoma were underwent by the total laminectomy via posterior midline approach .After the operation , the lumbar spinal stability was rebuilt by Dynesys placement .Results Schwannoma were completely resected . The X-ray reexamination in 1 ,3 ,6 months showed the activitivies of each vertebral flexion were good including L-spine flexion-extension position and the width of intervertebral space were equal .Implants location was good without adjacent segment degeneration , spinal instability and spondylolisthesis . Conclusions Dynesys placement during total laminectomy resection for lumbar spine intraspinal schwannoma can fully expose tumor area field of vision , completely remove schwannoma , effectively avoid spinal cord injury .Dynesys placement can not only achieve the traditional fusion stiffness of spinal stability , but also can effectively rebuild the physiologic stability and prevent the adiacent segment degeneration .%目的:探讨经后正中入路切除腰椎椎管内神经鞘瘤同时行腰椎动态稳定重建系统( Dynesys )置入对重建脊柱生理性稳定的作用。方法对采用后正中入路全椎板切除上腰椎椎管内神经鞘瘤的6例患者,术后应用腰椎Dynesys进行脊柱稳定性重建。结果神经鞘瘤均完整切除。术后1周、3个月、6个月时X线片复查示腰椎过伸、过屈位各椎体活动度良好,椎间隙等宽;内置物位置良好,无临近节段退变、脊柱失稳、椎体滑脱现象。结论对腰椎椎管内神经鞘瘤采用全椎板切除后置入Dynesys能够充分暴露肿瘤所在区域的视野,完整切除神经鞘瘤,有效避免损伤脊髓神经。 Dynesys既能达到传统强直融合的脊柱稳定性,还能够有效重建生理性稳

  19. PENGEMBANGAN MODEL “LIS-5C” PADA PENDIDIKAN TEKNOLOGI DAN KEJURUAN

    Directory of Open Access Journals (Sweden)

    Putu Sudira

    2015-04-01

    Full Text Available Abstrak: Penelitian ini bertujuan untuk mengembangkan model konsepsional dan model hipotetik LIS-5C dalam Pendidikan Teknologi dan Kejuruan. Penelitian dilaksanakan dalam tiga tahap, yaitu tahap studi literatur, perumusan model konsepsional, dan perumusan model hipotetik LIS-5C. Model konsepsioanal LIS-5C mencakup: (1 komponen filosofis: esensialisme dan pragmatisme; (2 komponen teoretis: teori belajar kognitivisme dan konstruktivisme, teori pendidikan kejuruan untuk pembangunan berkelanjutan; (3 komponen metodologis critical thinking and problem solving; communication, collaboration, and cellebration; creativity and innovation; dan (4 komponen teknis berpikir secara kreatif, bekerja secara kreatif dengan orang lain, menerapkan inovasi; memecahkan masalah, berkomunikasi secara efektif, bekerjasama dengan orang lain. Model hipotetik LIS-5C bermuara kepada skill belajar memecahkan masalah secara kreatif berdasarkan skill belajar berpikir kreatif, bekerja kreatif dengan orang lain, dan mengimplementasikan hasil inovasi dalam pemecahan masalah. Kata Kunci: learning-innovation skills (LIS, creativity, critical thinking, communication, collaboration, celebration, pemecahan masalah

  20. Some LIS Faculty Indicate Reservations about Open Access

    Directory of Open Access Journals (Sweden)

    Richard Hayman

    2016-09-01

    Full Text Available A Review of: Peekhaus, W., & Proferes, N. (2015. How library and information science faculty perceive and engage with open access. Journal of Information Science, 41(5, 640-661. http://dx.doi.org/10.1177/0165551515587855 Objective – To examine the awareness of, attitudes toward, and engagement with open access (OA publishing, based on rank and tenure status among library and information science (LIS faculty in North America. Design – Web-based survey distributed via email. Setting – Accredited library and information science (LIS programs in North America. Subjects – 276 professors and professors emeriti. Methods – Researchers collected email addresses for 1,017 tenure-track, tenured, and emeriti professors from the public websites of the LIS programs. Researchers sent an email invitation to participate in the survey by accessing a URL, with the survey itself delivered using Qualtrics software. The survey included 51 total questions, some with additional sub-questions, and most items used Likert-type rating scale. The researchers analysed the data using SPSS software, and indicated using chi-square tests to measure significance, with a stated intent to get beyond the descriptive statistics commonly seen in other publications. Main Results – This study’s results draw on 276 completed responses, for a response rate of 27%. Researchers reported that 53% of respondents had some experience with publishing in a peer-reviewed OA format. When asked whether they agreed that scholarly articles should be free to access for everyone, pre-tenure assistant professors were most likely to agree (74%, followed by tenured associate professors (62%, full professors (59% and then emeriti professors (8%. However, they found less likelihood that associate professors would have actually published in an OA format, highlighting a “disconnect between beliefs about accessibility of research and actual practice with open access” (p. 646. Researchers also

  1. Kilpailuedun ja lisäarvon kehittäminen markkinoinnissa : Herkkujuustola Oy

    OpenAIRE

    Molin, Annika

    2013-01-01

    Tämän työn tarkoitus oli selvittää Herkkujuustola Oy:n tuotteiden kilpailuetua ja lisäarvoa tuottavia tekijöitä tuotteiden jälleenmyyjille ja kuluttajille vähittäiskaupassa. Tarve tutkimustyön tekoon tuli toimeksiantajalta, joka halusi selvittää lisämyynnin mahdollisuuksia. Tavoitteena oli kehittää myynnin ja markkinoinnin kehityssuunnitelma, jonka avulla tuotteiden myyntiä ja yrityksen tunnettuutta saataisiin lisättyä. Kehityssuunnitelma räätälöitiin palvelemaan erityisesti Suomen kahta suur...

  2. The study of use of Web 2.0 tools in LIS education in India

    OpenAIRE

    2012-01-01

    The present study investigates LIS instructors’ familiarity with Web 2.0 concepts, tools and services, and applications related to LIS education. The survey method was used. The data collection tool was a web questionnaire, which was created with the help of software provided by surveymonkey.com. It was found that LIS instructors have a low level of familiarity regarding the use of Web 2.0. Most of the instructors use Web 2.0 for video sharing via YouTube. Nearly half of teachers have ...

  3. Hotellin lisäpalvelut perhematkailijoiden silmin : case: Original Sokos Hotel Ilves

    OpenAIRE

    Ojantausta, Jenni

    2014-01-01

    Tämän opinnäytetyön tarkoituksena on selvittää toimeksiantoyrityksen, Original Sokos Hotel Ilveksen, lisäpalveluiden merkitystä valitulle kohderyhmälle. Tutkittaviksi lisäpalveluiksi valittiin vastaanottopalvelut, sauna- ja allasosasto sekä leikkihuone, joiden pohjalta valikoitui myös kohderyhmäksi kotimaiset perhematkailijat. Tarkoituksena on lisäksi tutkia kohderyhmän matkailutottumuksia, jotta sen tapoja ja tarpeita ymmärrettäisiin paremmin. Tutkimusmenetelmäksi valittiin kvalitatiivin...

  4. LIS-HYMAP coupled Hydrological Modeling in the Nile River Basin and the Greater Horn of Africa

    Science.gov (United States)

    Jung, H. C.; Getirana, A.; Policelli, F. S.

    2015-12-01

    Water scarcity and resources in Africa have been exacerbated by periodic droughts and floods. However, few studies show the quantitative analysis of water balance or basin-scale hydrological modeling in Northeast Africa. The NASA Land Information System (LIS) is implemented to simulate land surface processes in the Nile River Basin and the Greater Horn of Africa. In this context, the Noah land surface model (LSM) and the Hydrological Modeling and Analysis Platform (HYMAP) are used to reproduce the water budget and surface water (rivers and floodplains) dynamics in that region. The Global Data Assimilation System (GDAS) meteorological dataset is used to force the system . Due to the unavailability of recent ground-based observations, satellite data are considered to evaluate first model outputs. Water levels at 10 Envisat virtual stations and water discharges at a gauging station are used to provide model performance coefficients (e.g. Nash-Sutcliffe, delay index, relative error). We also compare the spatial and temporal variations of flooded areas from the model with the Global Inundation Extent from Multi-Satellites (GIEMS) and the Alaska Satellite Facility (ASF)'s MEaSUREs Wetland data. Finally, we estimate surface water storage variations using a hypsographic curve approach with Shuttle Radar Topography Mission (SRTM) topographic data and evaluate the model-derived water storage changes in both river and floodplain. This study demonstrates the feasibility of using LIS-HYMAP coupled modeling to support seasonal forecast methods for prediction of decision-relevant metrics of hydrologic extremes.

  5. Nitrogen-doped carbons in Li-S batteries: materials design and electrochemical mechanism

    Directory of Open Access Journals (Sweden)

    Xia eLi

    2014-11-01

    Full Text Available Li-S batteries have been considered as next generation Li batteries due to their high theoretical energy density. Over the past few years, researchers have made significant efforts in breaking through critical bottlenecks which impede the commercialization of Li-S batteries. Beginning with a basic introduction to Li-S systems and their associated mechanism, this review will highlight the application of one specific carbon family, nitrogen-doped carbon materials in sulfur based cathodes. These materials will include nitrogen doped porous carbon, carbon nanotubes, nanofibers and graphene. The article will conclude with a summary of recent research efforts in this field as well as the future prospects for the use of nitrogen-doped carbon materials in Li-S batteries.

  6. Service Learning in Library and Information Science (LIS) Education: Connecting Research and Practice to Community

    OpenAIRE

    Mehra, Bharat

    2004-01-01

    This paper documents existing trends in service learning activities practiced in Library and Information Science (LIS) schools across the United States through the findings from two studies. The first study shares highlights from a question-based survey that elicited responses from faculty at a major LIS school in the United States about service learning activities incorporated in the courses they taught during the year 2002. The second study presents key aspects from content analysis of web...

  7. Patterns of LIS Literature Produced by Pakistani Authors, 2007-2012

    Directory of Open Access Journals (Sweden)

    Zulfiqar Ahamd

    2013-12-01

    Full Text Available This study analyzes the literature produced by faculty and students from library and information science schools in Punjab, Pakistan from 2007-2012 to explore the trends in research. A broad bibliometric analysis has been conducted to identify the areas of LIS research published during the period under study. It also discusses the impact of formal LIS research programs on research productivity in Punjab, Pakistan.

  8. 动态中和固定系统治疗腰椎退行性疾病的研究进展%Progress on dynamic neutralization system in treating lumbar degenerative diseases

    Institute of Scientific and Technical Information of China (English)

    陈喜君; 范顺武

    2013-01-01

    动态固定技术治疗腰椎退行性疾病日益成为基础和临床研究的热点.动态中和固定系统(dynamic neutralization system,Dynesys)作为动态固定技术的一种,既能保持脊柱的活动能力,改善患者的临床症状,还在延缓邻近节段退变方面表现出一定的优势.Dynesys技术可作为腰椎融合之外治疗腰椎退行性疾病的另一最佳选择,主要适用于轻至中度的腰椎退变性疾病,但它缺乏保持和恢复腰椎前凸的机制需要患者主动伸展实现前凸.如何延长使用寿命、预防并发症发生等问题有待解决,其远期疗效及延缓邻近节段退变作用机制需进一步明确.%Dynamic stabilization technology has increasingly become the hot spot in basic and clinical research for treating lumbar degenerative diseases.As one kind of dynamic stabilization technology,dynamic neutralization system (Dynesys) keeps the spinal motion ability and improve clinical symptoms of patients,moreover,it shows a certain advantage in delaying the degeneration of adjacent segments.From the available documents,the preliminary biomechanical and clinical results of Dynesys were optimistically,it has become another choice in treating the lumbar degenerative diseases besides the lumbar fusion,and it primarily applies to the treatment of mild to moderate lumbar degenerative disease.However,it lacks a mechanism to maintain and restore the lumbar lordosis and patients need active stretching to achieve lordosis.What's more,how to extend the service life and prevent complications remain to be solved,the long-term effect and the mechanism of delaying the adjacent segment degeneration need further investigation.In this article,the design principle,biomechanical research,clinical outcome and clinical application of Dynesys was reviewed.

  9. Developmental downregulation of LIS1 expression limits axonal extension and allows axon pruning

    Directory of Open Access Journals (Sweden)

    Kanako Kumamoto

    2017-07-01

    Full Text Available The robust axonal growth and regenerative capacities of young neurons decrease substantially with age. This developmental downregulation of axonal growth may facilitate axonal pruning and neural circuit formation but limits functional recovery following nerve damage. While external factors influencing axonal growth have been extensively investigated, relatively little is known about the intrinsic molecular changes underlying the age-dependent reduction in regeneration capacity. We report that developmental downregulation of LIS1 is responsible for the decreased axonal extension capacity of mature dorsal root ganglion (DRG neurons. In contrast, exogenous LIS1 expression or endogenous LIS1 augmentation by calpain inhibition restored axonal extension capacity in mature DRG neurons and facilitated regeneration of the damaged sciatic nerve. The insulator protein CTCF suppressed LIS1 expression in mature DRG neurons, and this reduction resulted in excessive accumulation of phosphoactivated GSK-3β at the axon tip, causing failure of the axonal extension. Conversely, sustained LIS1 expression inhibited developmental axon pruning in the mammillary body. Thus, LIS1 regulation may coordinate the balance between axonal growth and pruning during maturation of neuronal circuits.

  10. SEQUENCING OF FLAX LIS-1 INSERTION SITE IN THE ALBIDUM GENOTYPE

    Directory of Open Access Journals (Sweden)

    Jana Žiarovská

    2012-12-01

    Full Text Available The paper presents a methodology of identifying the insertion site of LIS-1-1 (Linum Insertion Sequence 1 element in flax Albidum variety when growing under the in vitro combined with environmental stress conditions. Abiotic stress was induced by a reduced nutrient content in a growth medium. The LIS-1 insertion site amplification was reaLIS-1ed using the forward LIS-L: 5'-GGG CAG TTT AAC TGT AAC GAA - 3 'and revers LIS-R: 5'-GCT TGG ATT TAG ACT TGG CAA C - 3' primers by PCR. PCR product was sequenced by direct sequencing method to proove the nucleotide sequence for matching with database LIS-1 sequence. A comparison has been matched with the sequence of the amplified segment in the database for all nucleotides except the 11-position in the 5'-3 ' direction, where instead of the three adenine pair is a couple in the Albidum variety. Changes caused by mobile elements or insertion sequences result in common flax in variability that can be used for the purposes of development of effective marker identification or environment based markers development.

  11. Evaluation of Journals and Researchers in Library and Information Science: Perspectives from Citations by Taiwan LIS Scholars

    Directory of Open Access Journals (Sweden)

    Mu-Hsuan Huang

    2008-12-01

    Full Text Available This article uses bibliometric analysis to study the evaluation of journals and researchers in the field of library and information science in Taiwan. For journal evaluation, the results show no statistically significant difference between the rankings of the citations cited by top LIS journals and by THCI journals. This suggests that the citation numbers of top LIS journals can be used to evaluate all the LIS journals. The results also show that the relationship between the rankings of JCR LIS journals and the rankings of the JCR LIS journals cited by top LIS journals is not statistically significant.This indicates that the rankings of the JCR LIS journals can not totally show their impacts on Taiwan LIS journals. For researcher evaluation, the results reveal that the correlation between the rankings of researchers cited by top LIS journals and the number of the research projects of National Science Council (NSC conducted by the researchers is not significant. This suggests using citation analyses as the only method to evaluate LIS researchers should be viewed with more prudence with the results. [Article content in Chinese

  12. Interfacial Reaction Dependent Performance of Hollow Carbon Nanosphere – Sulfur Composite as a Cathode for Li-S Battery

    OpenAIRE

    Zheng, Jianming; Yan, Pengfei; Gu, Meng; Wagner, Michael J.; Hays, Kevin A.; Chen, Junzheng; Li, Xiaohong; Wang, Chongmin; Zhang, Ji-Guang; Liu, Jun; Xiao, Jie

    2015-01-01

    Lithium-sulfur (Li-S) battery is a promising energy storage system due to its high energy density, cost effectiveness, and environmental friendliness of sulfur. However, there are still a number of technical challenges, such as low Coulombic efficiency and poor long-term cycle life, impeding the commercialization of Li-S battery. The electrochemical performance of Li-S battery is closely related with the interfacial reactions occurring between hosting substrate and active sulfur species, whic...

  13. IL NOME IN LIS NEL SEGNATO DI ADULTI UDENTI: UNA INDAGINE PRELIMINARE SUL CORPUS LISAU

    Directory of Open Access Journals (Sweden)

    Matteo La Grassa

    2016-09-01

    Full Text Available L’indagine presenta i primi risultati emersi dall’analisi di una parte del corpus LISAU (LIS di Adulti Udenti sulla produzione segnata del sintagma nominale in LIS da parte di informanti udenti che hanno appreso la LIS come L2 in età adulta. Scopo dell’indagine è cominciare a tracciare una linea di ricerca nell’ambito della linguistica acquisizionale con riferimento all’acquisizione della LIS come L2 da parte di udenti. Il corpus LISAU include il segnato di 7 informanti udenti con livello di competenza omogenea che hanno terminato un corso di terzo livello presso la sede Ente Nazionale Sordi di Prato e di 2 informanti sordi segnanti nativi considerati come gruppo di controllo. L’analisi si è incentrata sulla realizzazione dei nomi di prima e di seconda classe rilevando anche forme non citazionali, sulla realizzazione di forme plurali e sulle modalità di accordo tra nomi e aggettivi. Dalla maggior parte dei dati analizzati si rileva la piena competenza degli informanti nella realizzazione del sintagma nominale. Nouns Signed by hearing adults in LIS: a preliminary survey on the LISAU corpus The results of an analysis concerning part of the LISAU (LIS of  Hearing Adults corpus related to the production of the noun phrase in LIS by hearing informants who learned the LIS L2 in adulthood are presented. The purpose of the investigation was to outline the process with regard to the acquisition of LIS L2 by hearing adults. The LISAU corpus is composed of the sign language of 7 hearing informants with a homogeneous level of competence who completed a third-level course at the Ente Nazionale Sordi in Prato. LISAU also includes the sign language of 2 deaf native signers, considered the control group. The analysis focuses on the first and second-class nouns, including non-citation forms, plural forms and noun-adjective agreement. Most of the analyzed data reveals the informants’ full competence in creating noun phrases.

  14. X-ray Absorption Spectroscopy Characterization of a Li/S Cell

    Directory of Open Access Journals (Sweden)

    Yifan Ye

    2016-01-01

    Full Text Available The X-ray absorption spectroscopy technique has been applied to study different stages of the lithium/sulfur (Li/S cell life cycle. We have investigated how speciation of S in Li/S cathodes changes upon the introduction of CTAB (cetyltrimethylammonium bromide, CH3(CH215N+(CH33Br− and with charge/discharge cycling. The introduction of CTAB changes the synthesis reaction pathway dramatically due to the interaction of CTAB with the terminal S atoms of the polysulfide ions in the Na2Sx solution. For the cycled Li/S cell, the loss of electrochemically active sulfur and the accumulation of a compact blocking insulating layer of unexpected sulfur reaction products on the cathode surface during the charge/discharge processes make the capacity decay. A modified coin cell and a vacuum-compatible three-electrode electro-chemical cell have been introduced for further in-situ/in-operando studies.

  15. Näkyvyyden lisääminen sähköisissä markkinointikanavissa

    OpenAIRE

    Järvenpää, Jenny

    2011-01-01

    Tämän opinnäytetyön tarkoituksena on selvittää miten yritys pystyy hyödyntämään sähköisiä markkinointikanavia ja miten se voi lisätä näkyvyyttään näillä keinoilla. Opinnäytetyön toimeksiantajana toimii Kutomo Rasinmäki ky, jonka tarpeiden pohjalta opinnäytetyö on suunniteltu. Työn teoreettinen osuus käsittelee yrityskuvaa, mainetta ja näkyvyyden lisäämistä. Tämän lisäksi se keskittyy kuvailemaan sähköisen markkinoinnin kanavia. Lähteinä on käytetty suurimmaksi osaksi alan kirjallisuutta ...

  16. PhyLIS: a simple GNU/Linux distribution for phylogenetics and phyloinformatics.

    Science.gov (United States)

    Thomson, Robert C

    2009-07-30

    PhyLIS is a free GNU/Linux distribution that is designed to provide a simple, standardized platform for phylogenetic and phyloinformatic analysis. The operating system incorporates most commonly used phylogenetic software, which has been pre-compiled and pre-configured, allowing for straightforward application of phylogenetic methods and development of phyloinformatic pipelines in a stable Linux environment. The software is distributed as a live CD and can be installed directly or run from the CD without making changes to the computer. PhyLIS is available for free at http://www.eve.ucdavis.edu/rcthomson/phylis/.

  17. Lisäaineistetun betonin esikäsittelyn vaikutus pinnoitteen kiinnipysyvyyteen

    OpenAIRE

    2014-01-01

    Insinöörityön aiheena oli vesitiivistetyn betonin esikäsittelyn vaikutus pinnoitteen kiinnipysyvyyteen. Entuudestaan tiedettiin, että vesitiiveyttä parantavat lisäaineet betonissa heikentävät maalin kiinnipysyvyyttä. Tavoitteena oli löytää sellainen esikäsittelymenetelmä, jonka avulla tarttuvuutta saataisiin parannettua. Lisäaineina käytettiin Xypex Admix C-1000 NF:ää, Xypex Concentratea, Penetron Standardia ja Penetron Admixia. Esikäsittelymenetelmiksi valittiin suolahappopeittaus ja hi...

  18. D igital Reading Behavior of LIS Graduate Students: A Case Study at National Taiwan Normal University

    Directory of Open Access Journals (Sweden)

    Chia - Hsiang Chen

    2016-12-01

    Full Text Available This study explores the digital reading behavior of graduate students from a library and information science (LIS program. By correlating their habits with various forms of capital that may influence their reading behavior, this study adopts a qualitative approach to examine the four major concepts of Bourdieu’s practice theory: habitus and economic, cultural, and social capital. Semi-structured interviews were conducted with 15 students at National Taiwan Normal University. The findings of this study indicate that the aforementioned concepts influence the digital reading behavior of LIS graduate students and can provide librarians, faculty, and thesis advisors with suggestions for improving adaptive learning in the information society.

  19. Lightning Imaging Sensor (LIS) on the International Space Station (ISS): Launch, Installation, Activation, and First Results

    Science.gov (United States)

    Blakeslee, R. J.; Christian, H. J., Jr.; Mach, D. M.; Buechler, D. E.; Koshak, W. J.; Walker, T. D.; Bateman, M. G.; Stewart, M. F.; O'Brien, S.; Wilson, T. O.; Pavelitz, S. D.; Coker, C.

    2016-12-01

    Over the past 20 years, the NASA Marshall Space Flight Center, the University of Alabama in Huntsville, and their partners developed and demonstrated the effectiveness and value of space-based lightning observations as a remote sensing tool for Earth science research and applications, and, in the process, established a robust global lightning climatology. The observations included measurements from the Lightning Imaging Sensor (LIS) on the Tropical Rainfall Measuring Mission (TRMM) and its Optical Transient Detector (OTD) predecessor that acquired global observations of total lightning (i.e., intracloud and cloud-to-ground discharges) spanning a period from May 1995 through April 2015. As an exciting follow-on to these prior missions, a space-qualified LIS built as a flight-spare for TRMM will be delivered to the International Space Station (ISS) for a 2 year or longer mission, flown as a hosted payload on the Department of Defense (DoD) Space Test Program-Houston 5 (STP-H5) mission. The STP-H5 payload containing LIS is scheduled launch from NASA's Kennedy Space Center to the ISS in November 2016, aboard the SpaceX Cargo Resupply Services-10 (SpaceX-10) mission, installed in the unpressurized "trunk" of the Dragon spacecraft. After the Dragon is berth to ISS Node 2, the payload will be removed from the trunk and robotically installed in a nadir-viewing location on the external truss of the ISS. Following installation on the ISS, the LIS Operations Team will work with the STP-H5 and ISS Operations Teams to power-on LIS and begin instrument checkout and commissioning. Following successful activation, LIS orbital operations will commence, managed from the newly established LIS Payload Operations Control Center (POCC) located at the National Space Science Technology Center (NSSTC) in Huntsville, AL. The well-established and robust processing, archival, and distribution infrastructure used for TRMM was easily adapted to the ISS mission, assuring that lightning

  20. E-Mail discussion Forums in Library and Information Services (LIS: A Study

    Directory of Open Access Journals (Sweden)

    Dhanavandan S

    2012-08-01

    Full Text Available The email facilities are currently provided free service through many search engines groups. The discussion forums are discussed through e-mail groups in same professions. The terms discussion forum “Forum, Mailing list and List are using interchangeably. This paper made an attempt to analysis library and information services (LIS forum. This paper analysed the highlights definition, purpose of the study, groups available over the internet and features of the forum, .the number of members, the mode of hosting the messages among LIS forum.

  1. Automatización de un lisímetro de pesada

    OpenAIRE

    2012-01-01

    El desconocimiento de las necesidades de agua de los cultivos no tradicionales, es una de las principales preocupaciones de los productores de estos cultivos. Sin embargo; una alternativa es el uso del lisímetro, el cual es utilizado para determinar la lámina de agua requerida por el cultivo. El objetivo de este estudio fue automatizar el registro de las variables de peso y potencial mátrico, y la operación del sistema de riego en un lisímetro de pesada, a partir de una báscula con indicador ...

  2. PhyLIS: A Simple GNU/Linux Distribution for Phylogenetics and Phyloinformatics

    Directory of Open Access Journals (Sweden)

    Robert C. Thomson

    2009-01-01

    Full Text Available PhyLIS is a free GNU/Linux distribution that is designed to provide a simple, standardized platform for phylogenetic and phyloinformatic analysis. The operating system incorporates most commonly used phylogenetic software, which has been pre-compiled and pre-configured, allowing for straightforward application of phylogenetic methods and development of phyloinformatic pipelines in a stable Linux environment. The software is distributed as a live CD and can be installed directly or run from the CD without making changes to the computer. PhyLIS is available for free at http://www.eve.ucdavis.edu/rcthomson/phylis/.

  3. Towards a New Model of LIS Competences Management in Portugal: Implications for the Praxis and Academia Studies

    Science.gov (United States)

    Ochoa, Paula; Pinto, Leonor Gaspar

    2008-01-01

    After briefly presenting INCITE, The Portuguese Association for Information Management's, main research projects on LIS competences development and professional qualifications, this paper discusses the Association's contribution to the redesign of LIS professional competences pathways in the working environment; namely the movement from a pilot…

  4. Flipping the Classroom to Meet the Diverse Learning Needs of Library and Information Studies (LIS) Students

    Science.gov (United States)

    Johnston, Nicole; Karafotias, Theofanis

    2016-01-01

    This paper provides an overview of a teaching and learning project that explored the flipped classroom model to determine if it was an effective teaching and learning method to use with library and information studies (LIS) students with diverse learning needs. The project involved developing a range of videos in different styles for students to…

  5. The SOLS TICE Project: Satellite Television and Audioconferencing in Continuing Professional Development for LIS Staff.

    Science.gov (United States)

    Hughes, Alun; Priestley, John

    1992-01-01

    Describes SOLS TICE, the Satellite On-Line Searching Interactive Conferencing Experiment, conducted at the University of Plymouth (United Kingdom) to meet the training needs of staff in the library and information science (LIS) sector. Continuing professional development is discussed, instructional effectiveness and cost effectiveness are…

  6. Responding to the Challenges of KM Education in the LIS Sector: Some Academic and Professional Perspectives

    Science.gov (United States)

    Hazeri, Afsaneh; Martin, Bill

    2009-01-01

    As a newly emerging field of study, KM education is faced with significant challenges which continue to evolve. Informed by wider organisational perspectives, this paper presents the findings of recent research into this field. The first part of the research was in the form of an online survey canvassing the views of the wider LIS community on the…

  7. Knowledge and Use of Web 2.0 by LIS Academics in Iran

    Directory of Open Access Journals (Sweden)

    Maryam Sarrafzadeh

    2012-12-01

    Full Text Available The present paper discussed results of a study which aimed to explore the knowledge and use of Web 2.0 technologies by LIS academics in Iran and to explore the challenges they faced for using these technologies. The research method was explorative and empirical. Data was collected through a web-based survey questionnaire containing both open and close ended questions. The results showed that LIS academics in Iran had good level of familiarity with some Web 2.0 tools such as blog, wiki, YouTube and Facebook. However, their familiarity with some other Web 2.0 tools such as RSS, feeds, Twitter, Flickr, Delicious and podcast was limited. Blog, discussion groups, chat tools, file sharing tools, Wikis, SMS, video sharing tools and forum were used respectively by LIS academics in their teaching. Internet filtering was identified as the most inhibiting barrier to the use of Web 2.0 tools. Lack of access to high speed internet and lack of training were pointed as the other identified barriers. Authors suggested that to reap the benefits of Web 2.0, LIS academics needed to find alternative non filtered Web 2.0 tools to employ in their teaching and research.

  8. Factors Affecting Adoption of Facebook: An Exploratory Study of the LIS Community Perspective

    Science.gov (United States)

    Aharony, Noa

    2014-01-01

    This study seeks to investigate whether information professionals, as well as LIS students, are ready to assimilate Facebook in their work and educational environments. The study uses the Technology Acceptance Model (TAM) as well as some characteristics of the "Big Five" model of personality as a theoretical base from which to predict…

  9. Exploring LIS Students' Beliefs in Importance and Self-Efficacy of Core Information Literacy Competencies

    Science.gov (United States)

    Pinto, Maria; Pascual, Rosaura Fernandez

    2016-01-01

    Understanding perceptions of Library and Information Science (LIS) students on two dimensions--belief in the importance (BIM) of a set of core information competencies, and Self-Efficacy (SE)--is pursued. Factor analysis implementation raises a clear distinction between BIM and SE results. This analysis points to two sets of competencies:…

  10. Understanding the Roles of Nudel/Lis1/Dynein Pathway in Cell Motility

    Institute of Scientific and Technical Information of China (English)

    Xie Lele; Zhu Xueliang

    2007-01-01

    @@ Under the support of multiple grants by NSFC, including General Program, Key Program, National Science Fund for Distinguished Young Scholars, and Fund for Creative Research Groups, the research group explored how the Nudel/Lis1/dynein pathway functions in cell motility.

  11. Exploring LIS Students' Beliefs in Importance and Self-Efficacy of Core Information Literacy Competencies

    Science.gov (United States)

    Pinto, Maria; Pascual, Rosaura Fernandez

    2016-01-01

    Understanding perceptions of Library and Information Science (LIS) students on two dimensions--belief in the importance (BIM) of a set of core information competencies, and Self-Efficacy (SE)--is pursued. Factor analysis implementation raises a clear distinction between BIM and SE results. This analysis points to two sets of competencies:…

  12. Certain Characteristics of iSchools Compared to Other LIS Programs

    Science.gov (United States)

    Wedgeworth, Robert

    2013-01-01

    This dissertation compares 17 iSchools and 36 other LIS schools that offer the ALA-accredited Master's degree program according to certain characteristics. The study compiles quantitative and qualitative data on 32 variables and sub-variables drawn from the schools' web sites, ALISE 2010 Statistical Report, and Elsevier's SCOPUS…

  13. LIS Students' Perceptions toward the Assimilation of E-Books in the Library: An Exploratory Analysis

    Science.gov (United States)

    Aharony, Noa

    2013-01-01

    The present study explores LIS students' perceptions toward the assimilation of e-books in the library. The research was conducted during the summer semester of the 2010 academic year in Israel and 144 students participated in the research. The study used three questionnaires: a personal details questionnaire, students' perceptions towards e-books…

  14. Certain Characteristics of iSchools Compared to Other LIS Programs

    Science.gov (United States)

    Wedgeworth, Robert

    2013-01-01

    This dissertation compares 17 iSchools and 36 other LIS schools that offer the ALA-accredited Master's degree program according to certain characteristics. The study compiles quantitative and qualitative data on 32 variables and sub-variables drawn from the schools' web sites, ALISE 2010 Statistical Report, and Elsevier's SCOPUS…

  15. Long term stability of Li-S batteries using high concentration lithium nitrate electrolytes

    Energy Technology Data Exchange (ETDEWEB)

    Adams, Brian DG; Carino, Emily V.; Connell, Justin G.; Han, Kee Sung; Cao, Ruiguo; Chen, Junzheng; Zheng, Jianming; Li, Qiuyan; Mueller, Karl T.; Henderson, Wesley A.; Zhang, Jiguang

    2017-09-08

    Lithium-sulfur (Li-S) battery is a very promising candidate for the next generation of energy storage systems required for electrical vehicles and grid energy storage applications due to its very high theoretical specific energy (2500 W h kg-1). However, the low coulombic efficiency (CE) during repeated Li plating/stripping of these processes have limited practical application of rechargeable Li-S batteries. In this work, a new electrolyte system based on high concentration of LiNO3 in diglyme solvent is developed which enables high CE of Li metal plating/stripping and high stability of Li anode in the sulfur containing electrolyte. Tailoring of electrolyte properties for the Li negative electrode has proven to be a successful strategy for improving the capacity retention and cycle life of Li-S batteries. This electrolyte provides a CE for Li plating/stripping of greater than 99% for over 200 cycles. In contrast, Li metal cycles for only less than 35 cycles at high CE in the standard 1 M LiTFSI + 2wt% LiNO3 in DOL:DME electrolyte under the same conditions. The stable Li metal anode enabled by the new electrolyte may accelerate the applications of high energy density Li-S batteries in both electrical vehicles and large-scale grid energy storage markets.

  16. Factors Affecting Adoption of Facebook: An Exploratory Study of the LIS Community Perspective

    Science.gov (United States)

    Aharony, Noa

    2014-01-01

    This study seeks to investigate whether information professionals, as well as LIS students, are ready to assimilate Facebook in their work and educational environments. The study uses the Technology Acceptance Model (TAM) as well as some characteristics of the "Big Five" model of personality as a theoretical base from which to predict…

  17. The Value of Information: Normativity, Epistemology, and LIS in Luciano Floridi

    Science.gov (United States)

    Fyffe, Richard

    2015-01-01

    This paper is a critical reconstruction of Luciano Floridi's view of librarianship as "stewardship of a semantic environment," a view that is at odds with the dominant tradition in which library and information science (LIS) is understood as social epistemology. Floridi's work helps to explain the normative dimensions of librarianship in…

  18. Investigating a Peer-to-Peer Community Service Learning Model for LIS Education

    Science.gov (United States)

    O'Brien, Heather L.; Freund, Luanne; Jantzi, Leanna; Sinanan, Samantha

    2014-01-01

    This research explores the professionalization of Library and Information Science (LIS) students who participated in a peer-tutoring service, "Research Rescue." Research Rescue was a collaboration of the Chapman Learning Commons and the School of Library, Archival and Information Studies (SLAIS) at the University of British Columbia. The…

  19. End of Program Assessments and Their Association with Early Career Success in LIS

    Science.gov (United States)

    Rathbun-Grubb, Susan

    2016-01-01

    Analyses of North American LIS program alumni survey data indicate that the completion of any end of program assessment (EPA) or capstone is associated with certain early-career success measures. Using data collected in the Workforce Issues in Library and Information Science 2 project (WILIS 2), we examined the type of EPAs (internships,…

  20. Academically Informed Creative Writing in LIS Programs and the Freedom to Be Creative

    Science.gov (United States)

    Dali, Keren; Lau, Andrea; Risk, Kevin

    2015-01-01

    This article makes a case for the inclusion of creative writing in Library & Information Science (LIS) courses. Using an example of the course on reading practices and audiences, it shows how creative writing can contribute to the development of creativity, critical thinking, ability for self-direction and independent learning--all the…

  1. Dynesys与后路椎间融合治疗腰椎管狭窄症的临床效果比较研究%Dynesys and posterior lumbar interbody fusion for lumbar spinal stenosis in the comparative study of clinical effect

    Institute of Scientific and Technical Information of China (English)

    高洪亮

    2015-01-01

    Objective: To investigate the Dynesys and posterior lumbar interbody fusion in the treatment of lumbar spinal stenosis in.Methods:a total of August 2012 to 2014 years 5 months in our hospital from lumbar spinal stenosis were 85 cases, and were randomly divided into group A (n = 42) and group B (n = 43). The A group was treated by posterior lumbar interbody fusion, and the B group was treated by pedicle Dynesys operation, and the treatment effect was compared between the two groups. Results: there was no significant difference in the length of the incision in the A group and the B group (P>0.05). ODI score and VAS score were significantly lower in A group and B group (P0.05) and the VAS score at the end of groups (ODI).Conclusion: in lumbar spinal canal stenosis treatment in, posterior lumbar interbody fusion surgery and transpedicular Dynesys surgical treatment effect is similar, but the latter has a shorter operation time, less trauma and bleeding quantity low characteristic, can effectively stabilize the spine, and is worthy to be popularized.%目的:探讨Dynesys与后路椎间融合在腰椎管狭窄症中的治疗效果.方法:选取2012年8月到2014年5月我院收治的腰椎管狭窄症者85例,并随机分为A组(n=42)和B组(n=43).A组都采用后路椎间融合手术,B组均采用经椎弓根Dynesys手术治疗,对比两组的治疗效果.结果:A组、B组切口长度相比,差异无统计学意义(P>0.05).A组、B组末次随访ODI评分、VAS评分显著比手术前降低(P0.05).结论:在腰椎管狭窄症治疗中,后路椎间融合手术和经椎弓根Dynesys手术治疗效果相近,但后者具有手术时间短、创伤小和出血量低等特点,可有效地稳定脊柱,值得推广.

  2. Quality of life of ALS and LIS patients with and without invasive mechanical ventilation.

    Science.gov (United States)

    Rousseau, Marie-Christine; Pietra, Stéphane; Blaya, José; Catala, Anne

    2011-10-01

    There are very few studies where quality of life (QOL) is assessed in patients with complete physical and functional disability and dependence to invasive mechanical ventilation (IV). We compared QOL of amyotrophic lateral sclerosis (ALS) and locked-in-syndrome (LIS) patients with invasive mechanical ventilation to ALS and LIS patients without mechanical invasive ventilation. Thirty-four patients, 27 with ALS and seven with LIS (vascular or tumoral aetiology) were included in the study. Twelve had invasive ventilation, 22 had non-invasive ventilation, and in the non-invasive ventilation group, five of them had ventilation via mask. The following scales were used for patients: ALS Functional Rating Scale (ALSFRS), McGILL, Short-Form 36 (SF36), Beck Depression Inventory-II, the Toronto Alexithymia Scale and the anxiety inventory of Spielberger. Mean ALSFRS scores were significantly lower in the invasive ventilation group (IV) than in the non-invasive ventilation group. McGILL and SF36 were not significantly different between the IV group and the non-invasive ventilation group; there were no significant differences between the two groups for others scales either. Comparison between IV group and LIS without invasive mechanical ventilation revealed no significant difference for SF36 and McGILL QOL scores. QOL was not significantly different between the IV and not invasively ventilated patients, but ALSFRS was significantly lower in the IV group, and comparison of QOL scores between non-ventilated LIS patients who had the same score of dependence that invasively ventilated patients did not show any difference. Invasive mechanical ventilation for patients who accept tracheotomy allows life prolongation and their QOL is not affected; medical teams should be aware of that.

  3. O PAISAGISMO NO PLANEJAMENTO URBANO: O CASO DE SÃO FIDÉLIS - RJ

    Directory of Open Access Journals (Sweden)

    CRUZ, A.L.G.

    2015-12-01

    Full Text Available A presente pesquisa consiste em uma análise, através de pesquisa bibliográfica e pesquisa de campo, a utilização do paisagismo nos planejamentos urbanos e se há a valorização ou não do mesmo. Foi analisado de uma forma geral a importância do paisagismo e o benefício que proporciona para população local e se consta, seja no Plano Direto ou na Lei Orgânica (que é o caso do Município de São Fidélis, alguma lei que determine a implantação do paisagismo no meio urbano. Tendo como comparativo o Município de São Fidélis cuja cidade está passando por reformas urbanísticas, essas obras estão localizadas nos principais pontos históricos do município de São Fidélis, com o intuito de tornar a cidade mais atrativa e ao mesmo tempo, conservar o patrimônio histórico. A metodologia utilizada nesta pesquisa foi realizada através de registros fotográficos, entrevistas e pesquisa de campo, pesquisa documental e análise da Lei Orgânica da Cidade. O resultado desta pesquisa está registrado em fotografias, com o desenvolvimento das obras urbanísticas do Município de São Fidélis que foram citadas acima, dos projetos das praças e das pesquisas que foram feitas através de entrevistas realizadas com moradores do bairro do Centro da cidade. Através desta pesquisa, pode-se concluir que as obras que estão em andamento no centro da cidade de São Fidélis, ainda não são o suficiente e estão totalmente paralisadas. O objetivo desta pesquisa foi registrar a percepção de diferentes atos sociais sobre o processo de revitalização da Praça Jardim Elvídio Costa e da Beira Rio, no município de São Fidélis.

  4. Biomechanical analysis and design of a dynamic spinal fixator using topology optimization: a finite element analysis.

    Science.gov (United States)

    Lin, Hung-Ming; Liu, Chien-Lin; Pan, Yung-Ning; Huang, Chang-Hung; Shih, Shih-Liang; Wei, Shun-Hwa; Chen, Chen-Sheng

    2014-05-01

    Surgeons often use spinal fixators to manage spinal instability. Dynesys (DY) is a type of dynamic fixator that is designed to restore spinal stability and to provide flexibility. The aim of this study was to design a new spinal fixator using topology optimization [the topology design (TD) system]. Here, we constructed finite element (FE) models of degenerative disc disease, DY, and the TD system. A hybrid-controlled analysis was applied to each of the three FE models. The rod structure of the topology optimization was modelled at a 39 % reduced volume compared with the rigid rod. The TD system was similar to the DY system in terms of stiffness. In contrast, the TD system reduced the cranial adjacent disc stress and facet contact force at the adjacent level. The TD system also reduced pedicle screw stresses in flexion, extension, and lateral bending.

  5. SELECTION OF FISÁLIS POPULATIONS FOR HIBRIDIZATIONS, BASED ON FRUIT TRAITS

    Directory of Open Access Journals (Sweden)

    NICOLE TREVISANI

    2016-01-01

    Full Text Available ABSTRACT The objective of this study was to characterize the genetic variability in fisális populations and select promising parents based on fruit traits. The experimental design consisted of randomized blocks, with six populations. Five plants per treatment were sampled. The evaluated traits were fruit weight, capsule weight, 1000- seed weight and fruit diameter. The data were subjected to multivariate analysis of variance with error specification between and within (p <0.05. Mahalanobis’ distance was used as a measure of genetic dissimilarity. Significant differences for the assessed traits were detected between fisális populations. The ratio error among by within indicated no need for sampling within the experimental unit. Dissimilarity was greatest between Lages and Vacaria. The most discriminating traits were capsule weight, fruit weight and fruit diameter. The multivariate contrasts indicated differences between the populations of Vacaria and from Caçador, Lages and Peru, selected for hybridizations.

  6. Lisístrata, de Aristófanes a König

    OpenAIRE

    Martignone, Hernán

    2009-01-01

    En 411 a. C., Aristófanes pone en escena la comedia Lisístrata, en la que las mujeres atenienses y espartanas, hartas de la guerra del Peloponeso, idean un plan para que sus maridos dejen de luchar: una huelga de sexo. Contada desde la perspectiva femenina, Lisístrata nos muestra a las mujeres en acción en una inversión de roles cara al poeta cómico. En 1987, el historietista alemán Ralf König toma el argumento de esa comedia para brindarnos una relectura en clave homosexual: nos muestra qué ...

  7. Lisímetro de pesagem de grande porte.: desenvolvimento e calibração

    OpenAIRE

    2011-01-01

    A evapotranspiração de plantas frutíferas foi medida a partir da instalação e calibração de um lisímetro de pesagem de grande porte. O equipamento, composto por caçamba metálica em aço carbono, possui arquitetura circular com área de 5,72 m² e massa total de 10,5 toneladas. Uma muda de coqueiro anão-verde foi transplantada para o lisímetro e mantida sob as mesmas condições de solo e adubação do campo experimental. Na automação do processo foi utilizado o mecanismo de alívio de carga baseado e...

  8. 3D Graphene-Foam-Reduced-Graphene-Oxide Hybrid Nested Hierarchical Networks for High-Performance Li-S Batteries.

    Science.gov (United States)

    Hu, Guangjian; Xu, Chuan; Sun, Zhenhua; Wang, Shaogang; Cheng, Hui-Ming; Li, Feng; Ren, Wencai

    2016-02-24

    A 3D graphene-foam-reduced-graphene-oxide hybrid nested hierarchical network is synthesized to achieve high sulfur loading and content simultaneously, which solves the "double low" issues of Li-S batteries. The obtained Li-S cathodes show a high areal capacity two times larger than that of commercial lithium-ion batteries, and a good cycling performance comparable to those at low sulfur loading.

  9. LIS - Lampedusa Island Spectrometer - for atmospheric compounds observations in the Mediterranean area

    Science.gov (United States)

    Bortoli, D.; Giovanelli, G.; Costa, M. J.; Silva, A. M.

    2003-04-01

    The LIS (Lampedusa Island Spectrometer) is an instrument for the measurements of solar radiation scattered along the vertical direction in the UV-Visible spectral regions. By means of DOAS methodology application, the vertical contents of atmospheric compounds as NO2 and ozone, are calculated. LIS will be installed at the Lampedusa Island Climatic Station (35.50' N, 12.54' E) with the aim to monitor the physical and the chemical processes of air masses exchange between tropical and mid-latitudes regions. The heart of the spectrometer is the monochromator, where the luminous bundle is decomposed in its wavelengths thanks to a holographic spherical diffraction grating of 1200 grooves/mm (with spectral dispersion of 2.4 nm/mm at 300 nm, and spectral resolution of 0,5 nm). This last is moved by a stepper motor allowing inquiring the spectral range from 250 to 800 nm, in successive windows of 60 nm each. The Optical Mechanic Unit (OMU) comprises, beyond to the monochromator, the incoming radiation input. This can be positioned for external radiation or internal calibration lamps measurements by means of another stepper motor. Furthermore, a series of mechanical and electrical device as the filter wheel, 2 calibration lamps (HG and QJ), optical diodes and temperature sensors are utilized to optimize the performance of the instrument and to ensure the goodness of the measurements. The Electronic Control Unit (ECU) is located under the OMU and is composed by a monoboard computer, steppers and CCD driver devices. Its main tasks are the measurements and the storage of the collected data by means of LISDAS (LIS Data Acquisition Software). The first results for NO2 vertical column obtained during the LIS testing phase are presented. ACKNOWLEDGMENTS:The author Daniele Bortoli was financially supported by the Subprograma Ciência e Tecnologia do 3° Quadro Comunitário de Apoio.

  10. Carolina Michaëlis o los saberes de la Filología

    Directory of Open Access Journals (Sweden)

    Joaquín Rubio Tovar

    2005-06-01

    Full Text Available Two important international conferences (Berlin, Santiago on the work of Carolina Michaëlis have been held in recent years. The papers collected value her work within the historical background when it was carried out. Besides, they review the validity of her approach and analysis and present some modem contributions to the fields which she studied, particularly the Cancioneiro da Ajuda.

  11. Leaving Science for LIS: Interviews and a Survey of Librarians with Scientific and Technical Degrees

    Energy Technology Data Exchange (ETDEWEB)

    Hallmark, Julie; Lembo, Mary Frances

    2003-05-23

    The questions addressed in this research reflect the concerns and problems of Library and Information Science (LIS) professionals as they recruit librarians who have scientific or technical backgrounds. Presented as a panel discussion at the 2001 Special Libraries Association (SLA) Annual Conference, the study investigated why scientists and engineers choose to go into library and information science and how we, as a profession, can identify and encourage these newcomers.

  12. Dynein, Lis1 and CLIP-170 counteract Eg5-dependent centrosome separation during bipolar spindle assembly.

    Science.gov (United States)

    Tanenbaum, Marvin E; Macůrek, Libor; Galjart, Niels; Medema, René H

    2008-12-17

    Bipolar spindle assembly critically depends on the microtubule plus-end-directed motor Eg5 that binds antiparallel microtubules and slides them in opposite directions. As such, Eg5 can produce the necessary outward force within the spindle that drives centrosome separation and inhibition of this antiparallel sliding activity results in the formation of monopolar spindles. Here, we show that upon depletion of the minus-end-directed motor dynein, or the dynein-binding protein Lis1, bipolar spindles can form in human cells with substantially less Eg5 activity, suggesting that dynein and Lis1 produce an inward force that counteracts the Eg5-dependent outward force. Interestingly, we also observe restoration of spindle bipolarity upon depletion of the microtubule plus-end-tracking protein CLIP-170. This function of CLIP-170 in spindle bipolarity seems to be mediated through its interaction with dynein, as loss of CLIP-115, a highly homologous protein that lacks the dynein-dynactin interaction domain, does not restore spindle bipolarity. Taken together, these results suggest that complexes of dynein, Lis1 and CLIP-170 crosslink and slide microtubules within the spindle, thereby producing an inward force that pulls centrosomes together.

  13. Stress-Induced CDK5 Activation Disrupts Axonal Transport via Lis1/Ndel1/Dynein

    Directory of Open Access Journals (Sweden)

    Eva Klinman

    2015-07-01

    Full Text Available Axonal transport is essential for neuronal function, and defects in transport are associated with multiple neurodegenerative diseases. Aberrant cyclin-dependent kinase 5 (CDK5 activity, driven by the stress-induced activator p25, also is observed in these diseases. Here we show that elevated CDK5 activity increases the frequency of nonprocessive events for a range of organelles, including lysosomes, autophagosomes, mitochondria, and signaling endosomes. Transport disruption induced by aberrant CDK5 activation depends on the Lis1/Ndel1 complex, which directly regulates dynein activity. CDK5 phosphorylation of Ndel1 favors a high affinity Lis1/Ndel/dynein complex that blocks the ATP-dependent release of dynein from microtubules, inhibiting processive motility of dynein-driven cargo. Similar transport defects observed in neurons from a mouse model of amyotrophic lateral sclerosis are rescued by CDK5 inhibition. Together, these studies identify CDK5 as a Lis1/Ndel1-dependent regulator of transport in stressed neurons, and suggest that dysregulated CDK5 activity contributes to the transport deficits observed during neurodegeneration.

  14. Chloro-propylene Sulfite as Electrolyte Additive for Li/S Batteries

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    Chloro-propylene sulfite (ClPS) was employed as electrolyte additive of Li/S batteries for the first time. Linear potential sweep test showed that the ClPS keeps high electrochemical stability even under the voltage of 5.0V. Being used as electrolyte additive in Li/S batteries, ClPS displayed an excellent property for self-discharge prohibition. With ClPS additive the Li/S cells'initial discharge capacity was 856.2 mAh·g-1 and 830.8 mAh·g-1 at the current density of 15 mA·g-1and 30 mA·g-1, after 30 cycles the discharge capacities were contained at as high as 753.8 mAh·g-1 and 715.6 mAh·g-1. By means of infrared spectra, TG/DTA experiment and element content analysis the speculated reason of ClPS's novel function as additive was proposed.

  15. Estimation of energy density of Li-S batteries with liquid and solid electrolytes

    Science.gov (United States)

    Li, Chunmei; Zhang, Heng; Otaegui, Laida; Singh, Gurpreet; Armand, Michel; Rodriguez-Martinez, Lide M.

    2016-09-01

    With the exponential growth of technology in mobile devices and the rapid expansion of electric vehicles into the market, it appears that the energy density of the state-of-the-art Li-ion batteries (LIBs) cannot satisfy the practical requirements. Sulfur has been one of the best cathode material choices due to its high charge storage (1675 mAh g-1), natural abundance and easy accessibility. In this paper, calculations are performed for different cell design parameters such as the active material loading, the amount/thickness of electrolyte, the sulfur utilization, etc. to predict the energy density of Li-S cells based on liquid, polymeric and ceramic electrolytes. It demonstrates that Li-S battery is most likely to be competitive in gravimetric energy density, but not volumetric energy density, with current technology, when comparing with LIBs. Furthermore, the cells with polymer and thin ceramic electrolytes show promising potential in terms of high gravimetric energy density, especially the cells with the polymer electrolyte. This estimation study of Li-S energy density can be used as a good guidance for controlling the key design parameters in order to get desirable energy density at cell-level.

  16. Polymer-Rich Composite Electrolytes for All-Solid-State Li-S Cells.

    Science.gov (United States)

    Judez, Xabier; Zhang, Heng; Li, Chunmei; Eshetu, Gebrekidan Gebresilassie; Zhang, Yan; González-Marcos, José A; Armand, Michel; Rodriguez-Martinez, Lide M

    2017-08-03

    Polymer-rich composite electrolytes with lithium bis(fluorosulfonyl)imide/poly(ethylene oxide) (LiFSI/PEO) containing either Li-ion conducting glass ceramic (LICGC) or inorganic Al2O3 fillers are investigated in all-solid-state Li-S cells. In the presence of the fillers, the ionic conductivity of the composite polymer electrolytes (CPEs) does not increase compared to the plain LiFSI/PEO electrolyte at various tested temperatures. The CPE with Al2O3 fillers improves the stability of the Li/electrolyte interface, while the Li-S cell with a LICGC-based CPE delivers high sulfur utilization of 1111 mAh g(-1) and areal capacity of 1.14 mAh cm(-2). In particular, the cell performance gets further enhanced when combining these two CPEs (Li | Al2O3-CPE/LICGC-CPE | S), reaching a capacity of 518 mAh g(-1) and 0.53 mAh cm(-2) with Coulombic efficiency higher than 99% at the end of 50 cycles at 70 °C. This study shows that the CPEs can be promising electrolyte candidates to develop safe and high-performance all-solid-state Li-S batteries.

  17. Seasonal scale water deficit forecasting in Africa and the Middle East using NASA's Land Information System (LIS)

    Science.gov (United States)

    Shukla, Shraddhanand; Arsenault, Kristi R.; Getirana, Augusto; Kumar, Sujay V.; Roningen, Jeanne; Zaitchik, Ben; McNally, Amy; Koster, Randal D.; Peters-Lidard, Christa

    2017-04-01

    Drought and water scarcity are among the important issues facing several regions within Africa and the Middle East. A seamless and effective monitoring and early warning system is needed by regional/national stakeholders. Such system should support a proactive drought management approach and mitigate the socio-economic losses up to the extent possible. In this presentation, we report on the ongoing development and validation of a seasonal scale water deficit forecasting system based on NASA's Land Information System (LIS) and seasonal climate forecasts. First, our presentation will focus on the implementation and validation of the LIS models used for drought and water availability monitoring in the region. The second part will focus on evaluating drought and water availability forecasts. Finally, details will be provided of our ongoing collaboration with end-user partners in the region (e.g., USAID's Famine Early Warning Systems Network, FEWS NET), on formulating meaningful early warning indicators, effective communication and seamless dissemination of the monitoring and forecasting products through NASA's web-services. The water deficit forecasting system thus far incorporates NOAA's Noah land surface model (LSM), version 3.3, the Variable Infiltration Capacity (VIC) model, version 4.12, NASA GMAO's Catchment LSM, and the Noah Multi-Physics (MP) LSM (the latter two incorporate prognostic water table schemes). In addition, the LSMs' surface and subsurface runoff are routed through the Hydrological Modeling and Analysis Platform (HyMAP) to simulate surface water dynamics. The LSMs are driven by NASA/GMAO's Modern-Era Retrospective analysis for Research and Applications, Version 2 (MERRA-2), and the USGS and UCSB Climate Hazards Group InfraRed Precipitation with Station (CHIRPS) daily rainfall dataset. The LIS software framework integrates these forcing datasets and drives the four LSMs and HyMAP. The Land Verification Toolkit (LVT) is used for the evaluation of the

  18. Interfacial Reaction Dependent Performance of Hollow Carbon NanoSphere – Sulfur composite as a cathode for Li-S battery

    OpenAIRE

    Jianming eZheng; Pengfei eYan; Meng eGu; Wagner, Michael J.; Hays, Kevin A.; Junzheng eChen; Xiaohong eLi; Chongmin eWang; Jiguang eZhang; Jun eLiu; Jie eXiao

    2015-01-01

    Lithium-sulfur (Li-S) battery is a promising energy storage system due to its high energy density, cost effectiveness and environmental friendliness of sulfur. However, there are still a number of technical challenges, such as low Coulombic efficiency and poor long-term cycle life, impeding the commercialization of Li-S battery. The electrochemical performance of Li-S battery is closely related with the interfacial reactions occurring between hosting substrate and active sulfur species which ...

  19. Élisée Reclus e a excentricidade de sua geografia anarquista

    OpenAIRE

    2016-01-01

    Élisée Reclus (1830–1905) contradiz a centralidade racionalista de sua época, situando toda sua obra entre a composição de um novo paradigma na geografia e o posicionamento excêntrico, dotado de criticismo libertário, contrário à geografia racionalista. A geografia universitária que o sucedeu, negligenciou a sua contribuição, taxando-a de descritiva e órfã de objeto. Por sua vez, sua obra foi escamoteada e subsumida também pela geografia crítica radical, de base marxista, mesmo sabendo que el...

  20. Una lectura de la Lisístrata de Aristófanes

    OpenAIRE

    López Férez, Juan Antonio

    2006-01-01

    El propósito de este trabajo es despertar el interés por la lectura de Aristófanes, concretamente de la Lisístrata, por los muchos datos que ofrece: históricos, sociales, políticos, míticos y religiosos. La protagonista de tal comedia es la primera heroína femenina del teatro aristofánico. La relación de la comedia antigua con la vida política es permanente, incesante: las mujeres atenienses, cansadas de la guerra contra los lacedemonios, deciden obtener la paz de una forma singular: abstenié...

  1. THE MIRRORS OF ALTERITY IN “LUISA, FILHA DE NICA” BY ORLANDA AMARÍLIS

    Directory of Open Access Journals (Sweden)

    Prisca Agustoni de Almeida Pereira

    2009-04-01

    Full Text Available The present article aims at analysing the short story “Luísa, filha de Nica”, by the Cape Verdean writer Orlanda Amarílis, based on the thematic referential of alterity, identified in the representation of many characters of the mentioned work. The way in which the image of the other is developed – the crazy, the possessed, the dead – reveals a vision of the world that does not match the rational patterns of societies originated from the Enlightment.

  2. Communicating on Facebook: Romanian LIS Students’ Opinion on the Academic Libraries’ Use of Facebook

    Directory of Open Access Journals (Sweden)

    Octavia-Luciana Madge

    2014-01-01

    Full Text Available Many academic libraries have recently created a page on Facebook for better communicating with their users, especially the students. But what do students think about connecting with the library through a social networking site? This article presents the results of a small survey of undergraduates in the 1st and 2nd year of the Library and Information Science (LIS Programme from the University of Bucharest, conducted in order to find out the students’ opinion about the academic library interacting with them via Facebook.

  3. Har Brecht lært noget af Karin Michaëlis ?

    DEFF Research Database (Denmark)

    Czeskleba-Dupont, Rolf

    2016-01-01

    Det er blevet påvist af den amerikanske litteraturforsker Beverly Driver Eddy, kendt for sin store biografi og værksbeskrivelse af Karin Michaëlis, at Bertolt Brecht ikke kun under sit ophold på Fyn nød hendes nødhjælp og førte lange diskussioner med hende, men også at han lærte noget af hende...... for sin litterære produktion. Denne oversete side i Brecht-forskningen trænger til at blive taget med i et mere nuanceret billede af Brechts relation til denne moder-figur....

  4. Tuottavuuden lisääminen hienokuormitusprosessia kehittämällä

    OpenAIRE

    Karhunen, Niko

    2011-01-01

    Opinnäytetyön tavoitteena on lisätä toimeksiantajayrityksen tuottavuutta kehittämällä yrityksen hienokuormitusprosessia. Hienokuormitusprosessin kehittämisen tavoitteena on luoda työkaluja sekä toimintatapoja valmistuksen ohjaukseen. Opinnäytetyössä esitellään projektin yleinen määrittely ja tarkemmin toimitusprojektien ominaisuuksia sekä niiden hallintaa. Opinnäytetyössä tarkastellaan myös tuottavuutta sekä sen analysointia ja käydään läpi yleisimpiä tuottavuuden kehittämismenetelm...

  5. Assessing Training Needs of LIS Professionals: A Prerequisite for Developing Training Programs in University Libraries of Pakistan

    Directory of Open Access Journals (Sweden)

    Rubina Bhatti

    2014-06-01

    Full Text Available This study investigated LIS professionals’ perception related to their training needs in university libraries of Pakistan. The study adopted a descriptive survey design and the data were collected using a questionnaire administered to 150 LIS professionals in 59 public and private universities recognized by the Higher Education Commission of Pakistan. The response rate was 84 percent. The results obtained show that LIS professionals need training related to troubleshooting new technologies, endnote, data compression, Internet, social media such as Facebook, Blogger, Flickr, Twitter, and online databases. The respondents considered seminars, web-based training, computer tutorials, ad-hoc training sessions by staff members, and group briefings as effective training programs for improving their professional skills.

  6. BICD2, dynactin, and LIS1 cooperate in regulating dynein recruitment to cellular structures

    Science.gov (United States)

    Splinter, Daniël; Razafsky, David S.; Schlager, Max A.; Serra-Marques, Andrea; Grigoriev, Ilya; Demmers, Jeroen; Keijzer, Nanda; Jiang, Kai; Poser, Ina; Hyman, Anthony A.; Hoogenraad, Casper C.; King, Stephen J.; Akhmanova, Anna

    2012-01-01

    Cytoplasmic dynein is the major microtubule minus-end–directed cellular motor. Most dynein activities require dynactin, but the mechanisms regulating cargo-dependent dynein–dynactin interaction are poorly understood. In this study, we focus on dynein–dynactin recruitment to cargo by the conserved motor adaptor Bicaudal D2 (BICD2). We show that dynein and dynactin depend on each other for BICD2-mediated targeting to cargo and that BICD2 N-terminus (BICD2-N) strongly promotes stable interaction between dynein and dynactin both in vitro and in vivo. Direct visualization of dynein in live cells indicates that by itself the triple BICD2-N–dynein–dynactin complex is unable to interact with either cargo or microtubules. However, tethering of BICD2-N to different membranes promotes their microtubule minus-end–directed motility. We further show that LIS1 is required for dynein-mediated transport induced by membrane tethering of BICD2-N and that LIS1 contributes to dynein accumulation at microtubule plus ends and BICD2-positive cellular structures. Our results demonstrate that dynein recruitment to cargo requires concerted action of multiple dynein cofactors. PMID:22956769

  7. Choice of Court Clauses and Lis Pendens under Brussels I Regulation

    Directory of Open Access Journals (Sweden)

    Ekaterina Ivanova

    2010-08-01

    Full Text Available The principle of party autonomy, known not only in the common law legal system but also in the civil law system, provides parties contracting in civil and commercial matters with the right to establish their own rules, as long as these rules do not contradict mandatory law. This right is presumed to be protected by the force of law. It follows, that when a choice of court clause is included in the contract, disputes are supposed to be solved by the court chosen by the parties. This principle is not compromised by the Brussels I Regulation (or previously, the Brussels Convention. Moreover, it is repeated in its Articles 1 and 23. At the same time, the rule of lis pendens, provided for by its Article 27, aims to preclude subsequent actions in other Member States if a court is already seized and allows the appearance 'on the legal scene' of a court other than the court chosen by the parties. And the lis pendens rule prescribes the latter to stay proceedings until the court not chosen, but first seized, examines and declines its jurisdiction.

  8. A self-cleaning Li-S battery enabled by a bifunctional redox mediator

    Science.gov (United States)

    Ren, Y. X.; Zhao, T. S.; Liu, M.; Zeng, Y. K.; Jiang, H. R.

    2017-09-01

    The polysulfide shuttle effect and lithium dendrite growth in lithium-sulfur (Li-S) batteries can repeatedly breach the anodic solid electrolyte interphase (SEI) over cycling. As a result, irreversible short-chain sulfide side products (Li2Sx, x = 1, 2) keep depositing on the Li anode, leading to the active material loss, increasing the Li+ transport resistance, and thereby reducing the cycle life. In this work, indium iodide (InI3) is investigated as a bifunctional electrolyte additive for Li-S batteries to protect the Li anode and decompose the side products spontaneously. On the one hand, Indium (In) is electrodeposited onto the Li anode prior to Li plating during the initial charging process, forming a chemically and mechanically stable SEI to prevent the Li anode from reacting with soluble polysulfide species to form Li2Sx (x = 1, 2) side products. On the other hand, by adequately overcharging the battery, the triiodide/iodide redox mediator is capable of chemically transforming side products deposited on the Li anode and separator into soluble polysulfides, which can be recycled by the cathode. It is shown that the battery with the InI3 additive exhibits a prolonged cycle life, and is capable of retrieving its capacity by a facile overcharging process.

  9. Original Sokos Hotel Lappeen uudet ja uudistetut oheispalvelut ja niiden tuoma lisäarvo kanta-asiakkaille

    OpenAIRE

    Kaukonen, Clarissa

    2016-01-01

    Tämän opinnäytetyön tavoitteena oli selvittää toimeksiantajan eli Original Sokos Hotel Lappeen uusien ja uudistetuiden oheispalvelujen tuomaa lisäarvoa kyseisen hotellin kanta-asiakkaille. Opinnäytetyössä etsittiin vastausta tutkimusongelmaan, miten Original Sokos Hotel Lappeen kanta-asiakkaat ovat kokeneet uudet ja uudistetut oheispalvelut, ja ovatko ne tuoneet lisäarvoa majoittumisen yhteydessä. Opinnäytetyön teoriaosuus koostui aiheeseen liittyvästä kirjallisuudesta ja internetlähteis...

  10. Uusien lisäpalveluiden onnistuneisuuden arviointi : Case: Asuntomessut Jyväskylässä 2014

    OpenAIRE

    Huuskonen, Johanna; Koivistoinen, Jenna

    2014-01-01

    Opinnäytetyön tavoitteena oli selvittää Asuntomessut Jyväskylässä 2014 -tapahtuman uusien lisäpalveluiden onnistuneisuutta. Uusia lisäpalveluita olivat Puutarhanäyttely, Teemareitit, Mobiilimessukassi sekä Messujen Yö-tapahtuma. Opinnäytetyön teoriaosuus käsittelee palvelujärjestelmää ja onnistunutta palvelua sekä asiakkaan kuluttajakäyttäytymistä. Työn lopussa esitellään tutkimusmenetelmä ja kerrotaan työn tuloksista. Opinnäytetyö toteutettiin kvalitatiivisella menetelmällä. Aineistonkeru...

  11. Quantitative Analysis of Pac1/LIS1-mediated Dynein Targeting: Implications for Regulation of Dynein Activity in Budding Yeast

    OpenAIRE

    Markus, Steven M.; Plevock, Karen M.; St. Germain, Bryan J.; Punch, Jesse J.; Meaden, Christopher W.; Lee, Wei-Lih

    2011-01-01

    LIS1 is a critical regulator of dynein function during mitosis and organelle transport. Here, we investigated how Pac1, the budding yeast LIS1 homologue, regulates dynein targeting and activity during nuclear migration. We show that Pac1 and Dyn1 (dynein heavy chain) are dependent upon each other and upon Bik1 (budding yeast CLIP-170 homologue) for plus end localization, whereas Bik1 is independent of either. Dyn1, Pac1 and Bik1 interact in vivo at the plus ends, where an excess amount of Bik...

  12. MUNDO DADO E MUNDO CONSTRUÍDO NA OBRA DE BERNARDO ÉLIS GIVEN WORLD AND BUILT WORLD IN THE WORK OF BERNARDO ÉLIS

    Directory of Open Access Journals (Sweden)

    Leila Borges Dias Santos

    2011-02-01

    Full Text Available Este artigo constituiu-se por meio de pesquisa bibliográfica e qualitativa e tem o objetivo de relacionar os conceitos de mundo dado e mundo construído do historiador da religião Riolando Azzi com, respectivamente, o universo rural retratado por Bernardo Élis e seu regionalismo modernista. O universo retratado pelo autor goiano é também relacionado à noção de família patriarcal, e sua obra, exemplificada especificamente pelo conto A enxada, conta com a análise de críticos literários elencados no texto, como Antonio Candido, Afrânio Coutinho e Modesto Gomes. O universo rural é, portanto, associado ao mundo dado, e o movimento modernista, ao mundo construído.This article was composed by means of literature review and qualitative and aims to relate the concepts of the given world and constructed world of the historian of religion Riolando Azzi, respectively, the rural universe portrayed by Bernardo Elis and his modernist regionalism. The universe depicted by the author of Goias is also related to the notion of the patriarchal family, and his work, specifically exemplified by the story of The Hoe has an analysis of literary critics listed in the text, as Antonio Candido, Afranio Coutinho and Modesto Gomes. The rural world is therefore linked to the given world, and the modernist movement, the built world.

  13. Análise de crescimento do amarílis cultivado a pleno sol

    Directory of Open Access Journals (Sweden)

    Caroline de Moura D'Andréa Mateus

    2010-08-01

    Full Text Available O cultivo de amarílis (Hippeastrum x hybridum Hort. visa, principalmente, à produção e comercialização de bulbos para exportação. Informações sobre o seu ciclo de crescimento ainda são incongruentes. Assim, foi objetivo realizar medições que possam contribuir com estudos de análise de crescimento do amarílis var. Orange Souvereign, cultivado a pleno sol, nas condições encontradas em Santo Antônio de Posse, Estado de São Paulo. O delineamento experimental empregado foi o inteiramente casualizado. Utilizaram-se plantas cultivadas em uma área de 2 ha, onde os dados foram coletados mensalmente, durante 14 meses, de forma aleatória. Para cada uma das características analisadas foram utilizadas quatro repetições de 10 plantas. A área foliar determinada ao final do experimento foi de, em média, 3.102,65 cm², tendo em vista 10 folhas por planta. O diâmetro do bulbo aumentou, gradualmente, durante todo o período de produção, finalizando aos 420 dias após plantio, com 9,15 cm em média. A massa fresca total ao final do ciclo foi de, em média, 1.050,55 g, dos quais 39% (410 g foram de massa fresca obtida pelo bulbo da forma como é comercializado (bulbo + raízes. Os índices fisiológicos da análise de crescimento (taxa de crescimento absoluto, taxa de crescimento relativo, taxa de assimilação líquida e razão de área foliar demonstraram o comportamento da planta no campo, tendo o sistema assimilatório atingido bom desempenho nas condições de cultivo. O crescimento de amarílis foi considerado satisfatório do ponto de vista comercial.

  14. Refined Sulfur Nanoparticles Immobilized in Metal-Organic Polyhedron as Stable Cathodes for Li-S Battery.

    Science.gov (United States)

    Bai, Linyi; Chao, Dongliang; Xing, Pengyao; Tou, Li Juan; Chen, Zhen; Jana, Avijit; Shen, Ze Xiang; Zhao, Yanli

    2016-06-15

    The lithium-sulfur (Li-S) battery presents a promising rechargeable energy storage technology for the increasing energy demand in a worldwide range. However, current main challenges in Li-S battery are structural degradation and instability of the solid-electrolyte interphase caused by the dissolution of polysulfides during cycling, resulting in the corrosion and loss of active materials. Herein, we developed novel hybrids by employing metal-organic polyhedron (MOP) encapsulated PVP-functionalized sulfur nanoparticles (S@MOP), where the active sulfur component was efficiently encapsulated within the core of MOP and PVP as a surfactant was helpful to stabilize the sulfur nanoparticles and control the size and shape of corresponding hybrids during their syntheses. The amount of sulfur embedded into MOP could be controlled according to requirements. By using the S@MOP hybrids as cathodes, an obvious enhancement in the performance of Li-S battery was achieved, including high specific capacity with good cycling stability. The MOP encapsulation could enhance the utilization efficiency of sulfur. Importantly, the structure of the S@MOP hybrids was very stable, and they could last for almost 1000 cycles as cathodes in Li-S battery. Such high performance has rarely been obtained using metal-organic framework systems. The present approach opens up a promising route for further applications of MOP as host materials in electrochemical and energy storage fields.

  15. Preparing Teachers and Librarians to Collaborate to Teach 21st Century Skills: Views of LIS and Education Faculty

    Science.gov (United States)

    Latham, Don; Gross, Melissa; Witte, Shelbie

    2013-01-01

    This article discusses the results of an exploratory research project in which library and information studies (LIS) faculty and education faculty were asked about their views on teaching pre-service school librarians and teachers 21st Century Skills (as defined by the Partnership for 21st Century Skills) and librarian-teacher collaboration.…

  16. Mapping the Infoscape of LIS Courses for Intersections of Health-Gender and Health-Sexual Orientation Topics

    Science.gov (United States)

    Mehra, Bharat; Tidwell, William Travis

    2014-01-01

    The article explores the information landscape (i.e., infoscape) of library and information science (LIS) courses for intersections of health-gender and health-sexual orientation topics, concerns, and issues. This research was considered important because health information support services essential in today's society must include marginalized…

  17. Evaluation and Ranking of Iranian LIS (Library and Information Science Weblogs

    Directory of Open Access Journals (Sweden)

    Maryam Pakdaman Naeini

    2011-10-01

    Full Text Available Aim of this applied research was to extract evaluation criteria of Iranian LIS (Library and Information Science weblogs. Current research using analytical-survey method and in some stages Webometrics methods evaluated 107 sample weblogs. These weblogs were selected from 222 weblogs that had been submitted in directory of ILIS weblogs. This research made a checklist using literature review, expert's attitude and evaluation criteria of websites. This checklist was used for evaluation sample weblogs after standardizing. Finally a checklist was prepared that included 23 factors for evaluation and ranking of ILIS weblogs.. Finally, current research has suggested that this checklist can be used for judgment in carnivals of chosing top weblogs.

  18. Highly efficient and stable cryo-ground sulphur cathode for Li-S batteries

    Science.gov (United States)

    Kazda, T.; Krbal, M.; Pouzar, M.; Vondrák, J.; Straková, A. Fedorková; Slávik, M.; Wagner, T.; Macak, J. M.

    2016-11-01

    Here we report on a Li-S battery with cathode, based on a S powder obtained from bulk amorphous S, by cryogenic grinding. The cathode was prepared from a slurry, wherein the content of cryo-ground S powder was equal to 80 wt % (corresponds to ≈ 2.26 mg cm-2). Other slurry components included carbon Super P, and polyvinylidene fluoride, dispersed in N-methylpyrrolidone. The electrochemical performance of the as-prepared battery was compared to a battery based on an identically prepared paste, but containing reference S powder (with the orthorhombic structure). A longer life cycle, and enhanced capacity per gram, as well as per cm2 of electrode was revealed for the cryo-ground S-based cathode. The electrochemical results show that the loss in capacity of the cryo-ground S powder cathode was just 3% after 50 cycles, which suggests on a higher stability of S inside the cathode during cycling.

  19. Penelitian pengaruh naphthenic oil dan HAF black terhadap sifat pampat tetap pada kompon lis kaca mobil

    Directory of Open Access Journals (Sweden)

    A Buchori

    1996-06-01

    Full Text Available The objective of the research is to know the influence of naphthenic oil and HAF black properties of the compression set by constant load and constant deflection rubber strip compound. Rubber strip compound is made from natural rubber (RSS and synthetic rubber (SBR 1502 with the addition of ingredient such as softener, activator, filler, anti oxidant, accelerator and vulcanizing agent. It should be carried out using base formula by varrying naphtenic oil 3; 5 and 7 parts and carbon black 45; 50 and 55 parts for 9 compounds, then it should be tested their physical properties, compression set by constant load and constant deflection. The test is actually able to fullfill the specification of SII 1999-86 “Lis karet kaca kendaraan bermotor”. The result of the test statistically prove that naphthenicc oil and HAF black influence the physical properties.

  20. LIS1 and DCX: Implications for Brain Development and Human Disease in Relation to Microtubules

    Directory of Open Access Journals (Sweden)

    Orly Reiner

    2013-01-01

    Full Text Available Proper lamination of the cerebral cortex requires the orchestrated motility of neurons from their place of birth to their final destination. Improper neuronal migration may result in a wide range of diseases, including brain malformations, such as lissencephaly, mental retardation, schizophrenia, and autism. Ours and other studies have implicated that microtubules and microtubule-associated proteins play an important role in the regulation of neuronal polarization and neuronal migration. Here, we will review normal processes of brain development and neuronal migration, describe neuronal migration diseases, and will focus on the microtubule-associated functions of LIS1 and DCX, which participate in the regulation of neuronal migration and are involved in the human developmental brain disease, lissencephaly.

  1. Michaëlis--Menten kinetics of phenazone elimination in the perfused pig liver

    DEFF Research Database (Denmark)

    Andreasen, B; Tonnesen, K; Rabol, A;

    1977-01-01

    followed saturation kinetics (concentrations 0.1-12 mmol x 1(-1) and the maximal elimination rate (Vmax) was on average 102 mumol x min-1 x kg-1 liver and the Michaëlis-constant (Km) of 2.6 mmol x 1(-1). Estimates of Vmax and Km for the microsomal phenazone hydroxylase activity measured in liver biopsies......The purpose of the present study was to define the elimination kinetics of phenazone (NFN) in the isolated perfused pig liver. In five experiments phenazone was administered as constant infusion to obtain steady-state periods over a wide range of concentrations. The elimination of phenazone...... found to be considerably lower than in the perfused liver. The hepatic elimination of phenazone during perfusion of pig liver at phenazone concentrations corresponding to human therapeutic doses follows first-order kinetics....

  2. Sangre y vino en el juramento de Lisístrata (vv. 181-239)

    OpenAIRE

    García Soler, María José

    2002-01-01

    (ES) En el presente artículo trata de poner de relieve los mecanismos utilizados por Aristófanes en Lisístrata para presentar de forma paródica el sacrificio juratorio con el que las mujeres sellan el pacto para obligar a sus maridos a que firmen la paz. Se analiza en este trabajo la utilización del vocabulario específico y la organización básica de este ritual, que Aristófanes conserva intacto, en contraste con la sustitución operada en cuanto a la persona que realiza el sacrificio y a la ví...

  3. Aristófanes e a guerra dos sexos em Lisístrata

    OpenAIRE

    Pompeu, Ana Maria César

    2012-01-01

    Em Lisístrata, os homens usam armas mortais nos combates, as mulheres se servem da sensualidade e da sedução como instrumentos contra a mesma guerra, no plano sexual; no plano político, no entanto, elas se equiparam aos seus rivais, quando tomam a acrópole ateniense e a mantêm com o tesouro de guerra sob sua custódia. Na parábase, as mulheres apresentam um histórico da sua formação religiosa de cidadãs atenienses, que as autoriza a apresentar um discurso justo para Atenas. No agón elas precis...

  4. NASA SPoRT Modeling and Data Assimilation Research and Transition Activities Using WRF, LIS and GSI

    Science.gov (United States)

    Case, Jonathan L.; Blankenship, Clay B.; Zavodsky, Bradley T.; Srikishen, Jayanthi; Berndt, Emily B.

    2014-01-01

    weather research and forecasting ===== The NASA Short-term Prediction Research and Transition (SPoRT) program has numerous modeling and data assimilation (DA) activities in which the WRF model is a key component. SPoRT generates realtime, research satellite products from the MODIS and VIIRS instruments, making the data available to NOAA/NWS partners running the WRF/EMS, including: (1) 2-km northwestern-hemispheric SST composite, (2) daily, MODIS green vegetation fraction (GVF) over CONUS, and (3) NASA Land Information System (LIS) runs of the Noah LSM over the southeastern CONUS. Each of these datasets have been utilized by specific SPoRT partners in local EMS model runs, with select offices evaluating the impacts using a set of automated scripts developed by SPoRT that manage data acquisition and run the NCAR Model Evaluation Tools verification package. SPoRT is engaged in DA research with the Gridpoint Statistical Interpolation (GSI) and Ensemble Kalman Filter in LIS for soil moisture DA. Ongoing DA projects using GSI include comparing the impacts of assimilating Atmospheric Infrared Sounder (AIRS) radiances versus retrieved profiles, and an analysis of extra-tropical cyclones with intense non-convective winds. As part of its Early Adopter activities for the NASA Soil Moisture Active Passive (SMAP) mission, SPoRT is conducting bias correction and soil moisture DA within LIS to improve simulations using the NASA Unified-WRF (NU-WRF) for both the European Space Agency's Soil Moisture Ocean Salinity and upcoming SMAP mission data. SPoRT has also incorporated real-time global GVF data into LIS and WRF from the VIIRS product being developed by NOAA/NESDIS. This poster will highlight the research and transition activities SPoRT conducts using WRF, NU-WRF, EMS, LIS, and GSI.

  5. Lisätty todellisuus RSS-syötteiden heijastuksessa ja eri konenäkökirjastojen vertailu sen toteutuksessa

    OpenAIRE

    Päivärinta, E. (Elia); Savikoski, S. (Samuel)

    2017-01-01

    Lisätyllä todellisuudella tarkoitetaan virtuaalisen todellisuuden liittämistä ympäröivään todellisuuden, esimerkiksi videon, äänen tai kuvan muodossa. Lisätty todellisuus on lupaava teknologia, jolle löytyy tulevaisuudessa useita mahdollisia tutkimuskohteita ja kaupallisia toteutuksia. Tässä työssä vertaillaan SimpleCV ja OpenCV -konenäkökirjastojen käyttöä ja tehoa Pythonilla käyttämällä niitä RSS-syötteiden heijastukseen lisätyn todellisuuden muodossa. Lisäksi niiden toiminnallisuutta kokei...

  6. Rechargeable Lithium Sulfur (Li-S) Battery with Specific Energy 400 Wh/kg and Operating Temperature Range -60?C to 60?C Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Sion Power is developing a rechargeable lithium sulfur (Li-S) battery with a demonstrated specific energy exceeding 350 Wh/kg and the range of operating temperatures...

  7. Perioperative use of bispectral (BIS) monitor for a pressure ulcer patient with locked-in syndrome (LIS).

    Science.gov (United States)

    Yoo, Christine; Ayello, Elizabeth A; Robins, Bryan; Salamanca, Victor R; Bloom, Marc J; Linton, Patrick; Brem, Harold; O'Neill, Daniel K

    2014-10-01

    The bispectral (BIS) monitor uses brain electroencephalographic data to measure the depth of sedation and pharmacological response during anaesthetic procedures. In this case, the BIS monitor was used for another purpose, to demonstrate postoperatively to the nursing staff that a patient with history of locked-in syndrome (LIS), who underwent pressure ulcer debridement, had periods of wakefulness and apparent sensation, even with his eyes closed. Furthermore, as patients with LIS can feel pain, despite being unable to move, local block or general anaesthesia should be provided for sharp surgical debridement and other painful procedures. This use of the BIS has shown that as a general rule, the staff should treat the patient as though he might be awake and sensate even if he does not open his eyes or move his limbs. The goal of this study was to continuously monitor pain level and communicate these findings to the entire wound team, i.e. anaesthesiologists, surgeons and nurses.

  8. Graphene Sandwiched by Sulfur-Confined Mesoporous Carbon Nanosheets: A Kinetically Stable Cathode for Li-S Batteries.

    Science.gov (United States)

    Xin, Sen; You, Ya; Li, Hui-Qin; Zhou, Weidong; Li, Yutao; Xue, Leigang; Cong, Huai-Ping

    2016-12-14

    The practical use of lithium-sulfur batteries for the next-generation energy storage, especially the automobiles, was hindered by low electronic conductivity of sulfur and the resulting poor rate capabilities. Here, we report a sulfur-carbon composite by confining S into a graphene sandwiched in mesoporous carbon nanosheets with a two-dimensional ultrathin morphology, suitable mesopore size and large pore volume, and excellent electronic conductivity. Serving as cathode material for a Li-S battery, the elaborately designed S/C composite leads to "kinetically stable" transmissions of Li ions and electrons, triggering a stable electrochemistry and a record-breaking rate performance. In this way, the S/C composite has been proved a promising cathode material for high-rate Li-S batteries targeted at automobile storage.

  9. Élisée RECLUS. Géographe, anarchiste, écologiste, Jean-Didier VINCENT, 2010

    Directory of Open Access Journals (Sweden)

    Alain Marre

    2012-06-01

    Full Text Available Lire la biographie d'un géographe écrite par un non géographe est un grand plaisir ! Jean-Didier VINCENT, comme Élisée RECLUS, est natif, de Sainte-Foy-la-Grande. C'est peut être la raison pour laquelle il s'est lancé dans cette biographie hommage qui, comme il l'écrit lui-même en fin de son ouvrage est "une histoire d'amour". On citera les dernières lignes de son livre, qui donnent tout l'objectif de cet ouvrage : "J'ai voulu écrire une histoire d'amour. L'œuvre d'Élisée RECLUS a suscité bie...

  10. Evolution of the effect of sulfur confinement in graphene-based porous carbons for use in Li-S batteries

    Science.gov (United States)

    Jia, Xiangling; Zhang, Chen; Liu, Juanjuan; Lv, Wei; Wang, Da-Wei; Tao, Ying; Li, Zhengjie; Zheng, Xiaoyu; Yu, Jong-Sung; Yang, Quan-Hong

    2016-02-01

    A controllable drying strategy is proposed for the precise and non-destructive control over the structure of a 3D graphene assembly. Such an assembly is used as a model carbon material to investigate the pore structure-dependent shuttle effect and cycling performance of the cathode of a Li-S battery.A controllable drying strategy is proposed for the precise and non-destructive control over the structure of a 3D graphene assembly. Such an assembly is used as a model carbon material to investigate the pore structure-dependent shuttle effect and cycling performance of the cathode of a Li-S battery. Electronic supplementary information (ESI) available: Experimental details and the characterization results. See DOI: 10.1039/c5nr08839a

  11. Instalação, calibração e funcionamento de um lisímetro de pesagem

    OpenAIRE

    2007-01-01

    Este trabalho teve como objetivo construir, instalar, calibrar e avaliar a sensibilidade de um lisímetro de pesagem com célula de carga, instalado em Seropédica - RJ, a fim de determinar a evapotranspiração de referência (ETo). O lisímetro, com dimensões de 1,0 m x 1,0 m e 0,7 m de profundidade, foi construído com chapas de aço galvanizado e instalado sobre estrutura metálica montada sobre barras transversais, a fim de concentrar toda a massa do conjunto sobre uma célula de carga localizada n...

  12. Perioperative Use of Bispectral Monitor (BIS) for a Pressure Ulcer patient with Lock-In Syndrome (LIS)

    Science.gov (United States)

    Yoo, Christine; Ayello, Elizabeth A.; Robins, Bryan; Salamanca, Victor R.; Bloom, Marc J.; Linton, Patrick; Brem, Harold; O'Neill, Daniel K.

    2013-01-01

    The bispectral (BIS) monitor uses brain electroencephalographic data to measure depth of sedation and pharmacological response during anesthetic procedures. In this case, the BIS monitor was used for another purpose, to demonstrate postoperatively to the nursing staff that a patient with history of locked-in syndrome (LIS), who underwent pressure ulcer debridement, had periods of wakefulness and apparent sensation, even with his eyes closed. Furthermore, as patients with LIS can feel pain, despite being unable to move, local block or general anesthesia should be provided for sharp surgical debridement and other painful procedures. This use of the BIS has shown that as a general rule, the staff should treat the patient as though he might be awake and sensate even if he does not open his eyes or move his limbs. Our goal was to continuously monitor pain level and communicate these findings to the entire wound team, ie anesthesiologists, surgeons, and nurses. PMID:25252146

  13. Hierarchical sulfur electrodes as a testing platform for understanding the high-loading capability of Li-S batteries

    Science.gov (United States)

    Chung, Sheng-Heng; Chang, Chi-Hao; Manthiram, Arumugam

    2016-12-01

    Lithium-sulfur (Li-S) batteries are considered as an attractive electrochemical energy storage system due to the high theoretical capacity of sulfur (1,675 mA h g-1). However, high-loading sulfur cathodes would need to be employed for the Li-S cells to be practical, but the resulting poor cell cyclability and severe electrode degradation hamper their development. Here, we present a hierarchical sulfur cathode as a testing platform for understanding the high-loading capability of Li-S batteries. The hierarchical cathode presents good electrochemical utilization of above 70%, stable cyclability for 500-1,000 cycles, and high sulfur loadings of 4.2-10.0 mg cm-2. The exploration of the activation and the polysulfide-retention processes of the high-loading cathodes illustrates that the electrochemical stability mainly results from the stabilization of dissolved polysulfides within the cathode region as the electrochemically active catholyte. Therefore, the utilization of stabilized polysulfide migration might be a meaningful opportunity for designing high-loading cathodes and further improving their electrochemical stability and long-term cyclability.

  14. The Higher Education Qualifications Framework and the changing environment of LIS education and training in South Africa: some observations

    Directory of Open Access Journals (Sweden)

    Mabel K. Minishi-Majanja

    2009-01-01

    Full Text Available Technological, economic and other changes continually reshape the library and information science landscape. In South Africa, the Library and Information Science (LIS education and training sector is caught up in developments that include new directions in higher education such as the new Higher Education Qualifications Framework (HEQF. This paper provides some observations on the implications of the HEQF on LIS education and training, amid other changes that influence the discipline. While establishing common parameters and criteria for designing qualifications, the HEQF poses challenges to the LIS education needs and practices including names, levels and articulation of qualifications, as well as titles of posts and hierarchies in the workplace. The paper further expounds on the other challenges that need to be simultaneously tackled while reshaping the future. At this critical juncture, the education and training for the information professions in South Africa requires a mixture of ardent focus on understanding the market forces on the one hand, so as to attract students and produce employable graduates and on the other hand a dogged determination to uphold a noble profession in spite of encroaching competition.

  15. A de novo microdeletion involving PAFAH1B (LIS1 related to lissencephaly phenotype

    Directory of Open Access Journals (Sweden)

    Keiko Shimojima

    2015-09-01

    Full Text Available Lissencephaly is a type of the congenital malformation of the brain. Due to the impairments of neuronal migration, patients show absence of brain convolution manifesting smooth brain surfaces. One of the human genes responsible for lissencephaly is the platelet-activating factor acetylhydrolase 1b gene (PAFAH1B; also known as LIS1 located on 17p13.3. Patients with heterozygous deletion of this chromosomal region exhibit lissencephaly. Recently, we encountered a male patient who showed typical lissencephaly. Using a microarray analysis, we identified a 1.3 Mb submicroscopic deletion in 17p13.3. This deletion included PAFAH1B. Both of the parents showed no deletion in this region. Therefore, this was determined to be derived from de novo origin. After obtaining the written informed consent, skin fibroblasts were provided from this patient and disease-specific induced pluripotent stem (iPS cells were generated and used for medical research (Shimojima K, Okumura A, Hayashi M, Kondo T, Inoue H, and Yamamoto T. CHCHD2 is down-regulated in neuronal cells differentiated from iPS cells derived from patients with lissencephaly. Genomics, in press.

  16. Experiências com a dietilamina do ácido lisérgico (LSD 25

    Directory of Open Access Journals (Sweden)

    Paulo Luiz Vianna Guedes

    1961-03-01

    Full Text Available São relatados os resultados de 5 experiências realizadas em 3 pacientes com LSD 25, sendo salientadas as propriedades terapêuticas dêste medicamento como auxiliar da psicoterapia. Entre outras, são ressaltadas como principais qualidades: a ação regressiva sôbre o ego que facilita o aparecimento, sob forte carga afetiva, dos conflitos internos na transferência; b ação não uniforme sôbre o ego, poupando umas partes que, assim, não só assistem, mas podem, durante a experiência, analisar o material surgido; c conservação da memória que permite em dias ulteriores e fora da ação lisérgica, a análise das vivências ocorridas na experiência. O método só terá tôda sua utilidade, na opinião do autor, em mãos de médico psicanalista capacitado a lidar com material derivado do inconsciente.

  17. Antropología integral. Ensayos teóricos (Carmelo Lisón-Tolosana

    Directory of Open Access Journals (Sweden)

    Ricardo Sanmartín Arce

    2011-01-01

    Full Text Available Hay libros que se leen con el placer del hallazgo, del descubrimiento de una verdad presentida cuyo cuerpo tentábamos sin terminar de reconocerlo. Dar forma comprensible a un proceso de conocimiento sutil, rico, denso y penetrante en un objeto de estudio como el de la Antropología contemporánea no es una tarea fácil. Y más difícil es todavía hacer esa difícil tarea de un modo que resulte fácil al lector. No se trata solamente de saber escribir, sino de saber de lo que se escribe. Esta es quizá la principal virtud del libro. Lisón habla del conocimiento que elabora la Antropología desde una gran experiencia, desde una experiencia muy sólida, madurada a lo largo de una fecunda trayectoria profesional en el oficio de antropólogo.

  18. Lack of Congruence between Analyses and Conclusions Limits Usefulness of Study of Socio-cultural Influences on Student Choice of LIS Field in Greece. A Review of: Moniarou-Papaconstantinou, V., Tsatsaroni, A., Katsis, A., & Koulaidis, V. (2010). LIS as a field of study: Socio-cultural influences on students’ decision making. Aslib Proceedings: New Information Perspectives, 62(3), 321-344.

    OpenAIRE

    Diana K. Wakimoto

    2010-01-01

    Objective — To determine how social and cultural factors influence students’ decision to study library and information science (LIS) as undergraduates.Design — Semi-structured interviews and quantitative analysis of questionnaire data.Setting — Three schools in Greece with LIS programs at the undergraduate level.Subjects — One hundred eighty-seven first-year students enrolled in Greece’s LIS schools’ undergraduate programs in the autumn semester of the 2005-2006 academic year.Methods — The au...

  19. Editors View the Continuous Publication Model as a Satisfactory Alternative for Open Access LIS Journals

    Directory of Open Access Journals (Sweden)

    Richard Hayman

    2014-09-01

    Full Text Available A Review of: Cirasella, J., & Bowdoin, S. (2013. Just roll with it? Rolling volumes vs. discrete issues in open access library and information science journals. Journal of Librarianship and Scholarly Communication, 1(4. http://dx.doi.org/10.7710/2162-3309.1086 Abstract Objective – To understand the prevalence of, motivations for, and satisfaction with using a rolling-volume publishing model, as opposed to publishing discrete issues, across open access academic journals in library and information science. Design – A 12 question survey questionnaire. Setting – English-language, open access library and information science (LIS journals published in the United States of America. Subjects – A total of 21 open access LIS journals identified via the Directory of Open Access Journals that were actively publishing, and that also met the authors’ standard of scholarliness, which they established by identifying a journal’s peer-review process or other evidence of rigorous review. Based on responses, 12 journals published using discrete issues, while 9 published as rolling volumes or as rolling volumes with some discrete issues. Methods – In late 2011, the study’s authors invited lead editors or primary journal contacts to complete the survey. Survey participants were asked to identify whether their journal published in discrete issues, rolling volumes, or rolling volumes with occasional discrete issues, with the latter two categories combined as one for ease of results analysis. Survey logic split respondents into two groups, either discrete-issue or rolling-volume. Respondents in both categories were posed similar sets of questions, with the key difference being that the questions directed at each category accounted for the publication model the journals themselves identified as using. Editors from both groups were asked about the reasons for using the publication model they identified for their journal: within the survey tool, authors

  20. Interfacial Reaction Dependent Performance of Hollow Carbon NanoSphere – Sulfur composite as a cathode for Li-S battery

    Directory of Open Access Journals (Sweden)

    Jianming eZheng

    2015-05-01

    Full Text Available Lithium-sulfur (Li-S battery is a promising energy storage system due to its high energy density, cost effectiveness and environmental friendliness of sulfur. However, there are still a number of technical challenges, such as low Coulombic efficiency and poor long-term cycle life, impeding the commercialization of Li-S battery. The electrochemical performance of Li-S battery is closely related with the interfacial reactions occurring between hosting substrate and active sulfur species which are poorly conducting at fully oxidized and reduced states. Here, we correlate the relationship between the performance and interfacial reactions in the Li-S battery system, using a hollow carbon nanosphere (HCNS with highly graphitic character as hosting substrate for sulfur. With an appropriate amount of sulfur loading, HCNS/S composite exhibits excellent electrochemical performance because of the fast interfacial reactions between HCNS and the polysulfides. However, further increase of sulfur loading leads to increased formation of highly resistive insoluble reaction products (Li2S2/Li2S which limits the reversibility of the interfacial reactions and results in poor electrochemical performances. These findings demonstrate the importance of the interfacial reaction reversibility in the whole electrode system on achieving high capacity and long cycle life of sulfur cathode for Li-S batteries.

  1. Microtubules and Lis-1/NudE/dynein regulate invasive cell-on-cell migration in Drosophila.

    Directory of Open Access Journals (Sweden)

    Nachen Yang

    Full Text Available The environment through which cells migrate in vivo differs considerably from the in vitro environment where cell migration is often studied. In vivo many cells migrate in crowded and complex 3-dimensional tissues and may use other cells as the substratum on which they move. This includes neurons, glia and their progenitors in the brain. Here we use a Drosophila model of invasive, collective migration in a cellular environment to investigate the roles of microtubules and microtubule regulators in this type of cell movement. Border cells are of epithelial origin and have no visible microtubule organizing center (MTOC. Interestingly, microtubule plus-end growth was biased away from the leading edge. General perturbation of the microtubule cytoskeleton and analysis by live imaging showed that microtubules in both the migrating cells and the substrate cells affect movement. Also, whole-tissue and cell autonomous deletion of the microtubule regulator Stathmin had distinct effects. A screen of 67 genes encoding microtubule interacting proteins uncovered cell autonomous requirements for Lis-1, NudE and Dynein in border cell migration. Net cluster migration was decreased, with initiation of migration and formation of dominant front cell protrusion being most dramatically affected. Organization of cells within the cluster and localization of cell-cell adhesion molecules were also abnormal. Given the established role of Lis-1 in migrating neurons, this could indicate a general role of Lis-1/NudE, Dynein and microtubules, in cell-on-cell migration. Spatial regulation of cell-cell adhesion may be a common theme, consistent with observing both cell autonomous and non-autonomous requirements in both systems.

  2. Lisää liikuntaa vertaistoiminnan kautta : liikuntavälineenä jumppahäntä

    OpenAIRE

    Niemi, Hanna-Liisa

    2015-01-01

    Tämän opinnäytetyön tarkoitus oli tutkia, miten voisimme lisätä kehitys- ja sosiaalisen vuorovaikutuksen häiriöitä omaavien Koivulan koulun lasten ja Sampolan päivätoiminnan aikuisten liikuntaa. Työskentelytapana käytettiin vertaistoimintaa ja välineenä Sampolan päivätoiminnan ja Satakunnan ammattikorkeakoulun yhteistyönä kehitettyä liikuntavälinettä, jumppahäntää. Kehitysvammaiset ja monimuotoista kehityshäiriötä omaavat (F83 diagnoosin saaneet) oppivat parhaiten konkreettisesti tekemällä. ...

  3. Rasgos de la comicidad en el texto dramático: Lisístrata, de Aristófanes

    OpenAIRE

    Sardón Navarro, Isabel María Sonia

    2001-01-01

    Nuestra intención consiste en determinar un modelo de análisis de la comicidad en el texto teatral. Para ello, hemos centrado nuestro trabajo en uno de los textos de la comedia griega que mejor presenta estas características: Lisístrata, de Aristófanes. A través de la burla del mundo oficial establecido, de las referencias al cuerpo, al erotismo y a la sexualidad, de la parodia dramática y verbal, de un "mundo al revés" donde triunfan las mujeres sobre los hombres, y de la libertad del lengua...

  4. Collagen-biomorphic porous carbon nanofiber monoliths: Biosilicification-assisted sustainable synthesis and application in Li-S battery

    Science.gov (United States)

    Hu, Wen; Shen, Tao; Hou, Hongying; Gan, Guoyou; Zheng, Biju; Li, Fengxian; Yi, Jianhong

    2016-12-01

    Monolithic carbon has been synthesized via a sustainable biomimetic route utilizing intrafibrillar silicified collagen sponge as precursor and morphogenesis template. The mineralized silica in the biohybrid prevents collapse of the carbon during pyrolysis. Upon biosilica removal results show that the carbon monoliths inherit the porous fiber structure of the mother collagen. The carbon nanofiber framework facilitates the construction of a high electrical conductive pathway, while the internal spaces developed among the intertwined fibrillar network and pores within nanofiber walls offer room for sulfur storage. The as-obtained carbon-sulfur cathode exhibits an accessible discharge capacity approaching 800mAh g-1 in Li-S battery.

  5. A funkcionális élelmiszerek potenciális fogyasztói és vásárlói csoportjainak felmérése

    OpenAIRE

    Németh-T., Anett; Vincze-Tóth, Judit; Hegyi, Judit; Troján, Szabolcs

    2013-01-01

    A funkcionális élelmiszerek mint hozzáadottérték-többlettel rendelkező termékek napjainkban a világ élelmiszeriparának innovatív termékei, amit a folyamatosan növekvő piaci részesedésük is alátámaszt. A vizsgálatok összesített eredményei alapján az „átlagos fogyasztók†81%-a nem tartozott a funkcionális élelmiszereket rendszeresen fogyasztók körébe, ezen belül az egyáltalán nem fogyasztók aránya 33%. Az „országos†megkérdezetti kör 65%-ánál a kevés vagy a hiányos információ indokolta a ...

  6. What Technology Skills Do Developers Need? A Text Analysis of Job Listings in Library and Information Science (LIS from Jobs.code4lib.org

    Directory of Open Access Journals (Sweden)

    Monica Maceli

    2015-09-01

    Full Text Available Technology plays an indisputably vital role in library and information science (LIS work; this rapidly moving landscape can create challenges for practitioners and educators seeking to keep pace with such change.  In pursuit of building our understanding of currently sought technology competencies in developer-oriented positions within LIS, this paper reports the results of a text analysis of a large collection of job listings culled from the Code4lib jobs website.  Beginning over a decade ago as a popular mailing list covering the intersection of technology and library work, the Code4lib organization's current offerings include a website that collects and organizes LIS-related technology job listings.  The results of the text analysis of this dataset suggest the currently vital technology skills and concepts that existing and aspiring practitioners may target in their continuing education as developers.

  7. Thermal Exfoliation of Layered Metal-Organic Frameworks into Ultrahydrophilic Graphene Stacks and Their Applications in Li-S Batteries.

    Science.gov (United States)

    Hao, Guang-Ping; Tang, Cheng; Zhang, En; Zhai, Peiyan; Yin, Jun; Zhu, Wancheng; Zhang, Qiang; Kaskel, Stefan

    2017-08-07

    2D nanocarbon-based materials with controllable pore structures and hydrophilic surface show great potential in electrochemical energy storage systems including lithium sulfur (Li-S) batteries. This paper reports a thermal exfoliation of metal-organic framework crystals with intrinsic 2D structure into multilayer graphene stacks. This family of nanocarbon stacks is composed of well-preserved 2D sheets with highly accessible interlayer macropores, narrowly distributed 7 Å micropores, and ever most polar pore walls. The surface polarity is quantified both by its ultrahigh water vapor uptake of 14.3 mmol g(-1) at low relative pressure of P/P 0 = 0.4 and ultrafast water wetting capability in less than 10.0 s. Based on the structural merits, this series hydrophilic multilayer graphene stack is showcased as suitable model cathode host for unveiling the challenging surface chemistry issue in Li-S batteries. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  8. 皮层下带状灰质异位的DCX和LIS1基因检测

    Institute of Scientific and Technical Information of China (English)

    欧阳梅; 李淡芳; 张佩琪; 李花; 胡湘蜀; 刘兴洲

    2015-01-01

    目的:对皮层下带状灰质异位症(subcortical band heterotopias,SBH,双皮层综合征)患者进行已经证实的致病基因DCX和LIS1检测,明确其基因型与临床表型、影像学的关系。方法对确诊为皮层下带状灰质异位症的1例患者进行相关基因DCX和LIS1的检测。结果发现患者有DCX基因2号外显子新发突变,c.451A>G(p.K151E )。结论对确诊的SBH患者进行相关基因检测对分析患者的表型、影像学特点及预后有重要的临床意义。

  9. A high-density graphene-sulfur assembly: a promising cathode for compact Li-S batteries

    Science.gov (United States)

    Zhang, Chen; Liu, Dong-Hai; Lv, Wei; Wang, Da-Wei; Wei, Wei; Zhou, Guang-Min; Wang, Shaogang; Li, Feng; Li, Bao-Hua; Kang, Feiyu; Yang, Quan-Hong

    2015-03-01

    This work reports a high-density graphene/sulfur assembly for compact Li-S batteries with high volumetric capacity, which retains good structural stability and conductivity. This dense assembly was prepared by a reduction-triggered self-assembly of graphene oxide with simultaneous deposition of sulfur, followed by unique evaporation-induced spatial volume shrinkage. This assembly has an ultrahigh density, delivering an unprecedented volumetric capacity that is much higher than common carbon/sulfur cathodes. In particular, the unique spatial confinement derived from the shrinkage of the graphene/sulfur assembly is favorable for stabilizing sulfur cathodes.This work reports a high-density graphene/sulfur assembly for compact Li-S batteries with high volumetric capacity, which retains good structural stability and conductivity. This dense assembly was prepared by a reduction-triggered self-assembly of graphene oxide with simultaneous deposition of sulfur, followed by unique evaporation-induced spatial volume shrinkage. This assembly has an ultrahigh density, delivering an unprecedented volumetric capacity that is much higher than common carbon/sulfur cathodes. In particular, the unique spatial confinement derived from the shrinkage of the graphene/sulfur assembly is favorable for stabilizing sulfur cathodes. Electronic supplementary information (ESI) available. See DOI: 10.1039/c4nr06863g

  10. LIS-lnterlink-connecting laboratory information systems to remote primary health-care centres via the Internet.

    Science.gov (United States)

    Clark, B; Wachowiak, B; Crawford, E W; Jakubowski, Z; Kabata, J

    1998-01-01

    A pilot study was performed to evaluate the feasibility of using the Internet to securely deliver patient laboratory results, and the system has subsequently gone into routine use in Poland. The system went from design to pilot and then to live implementation within a four-month period, resulting in the LIS-Interlink software product. Test results are retrieved at regular intervals from the BioLink(TM) LIS (Laboratory Information System), encrypted and transferred to a secure area on the Web server. The primary health-care centres dial into the Internet using a local-cell service provided by Polish Telecom (TP), obtain a TCP/IP address using the TP DHCP server, and perform HTTP 'get' and 'post' operations to obtain the files by secure handshaking. The data are then automatically inserted into a local SQL database (with optional printing of incoming reports)for cumulative reporting and searching functions. The local database is fully multi-user and can be accessed from different clinics within the centres by a variety of networking protocols.

  11. O cerrado goiano na literatura de Bernardo Élis sob o olhar da história ambiental

    Directory of Open Access Journals (Sweden)

    Sandro Dutra e Silva

    Full Text Available Resumo O artigo analisa as representações de natureza na literatura de Bernardo Élis, a partir dos pressupostos teóricos e metodológicos da história ambiental. Élis fez parte de um grupo de intelectuais que apresentava, por meio da literatura, as condições de vida na fronteira goiana e as relações humanas nessas paisagens “gerais”. Nas gerais, os dramas de suas personagens misturavam-se ao ambiente físico do cerrado, numa narrativa realista e denunciadora das condições de vida na isolada fronteira (ermos e gerais. Em seu diálogo com a literatura, os fundamentos desse campo da pesquisa historiográfica podem ser adotados como instrumentos analíticos, aliados a concepções relativas à integração entre sociedade e natureza, como as de fronteira e wilderness.

  12. The correlation between carbon structures and electrochemical properties of sulfur/carbon composites for Li-S batteries

    Science.gov (United States)

    Du, Zhenzhen; Xu, Jin; Jin, Song; Shi, Yuchen; Guo, Chengkun; Kong, Xianghua; Zhu, Yanwu; Ji, Hengxing

    2017-02-01

    The structures of carbon materials greatly affect the electrochemical properties of sulfur/carbon composites for lithium-sulfur (Li-S) batteries. Understanding the effect of carbon structure factors on the electrochemical properties of sulfur/carbon composites helps in rational designing of the cathode material for optimized battery performance. We prepare reduced graphene oxide (RGO), cysteine-modified RGO (RGO-CYS), microwave-expanded graphite oxide (MEGO) and activated-MEGO (aMEGO) with specific surface areas (SSA) of 58-3010 m2 g-1, C/O atomic ratios of 2.41-10.81, pore sizes of 0.9-5.6 nm and pore volumes of 0.14-2.03 cm3 g-1. The electrochemical performance researches S/RGO-CYS > S/RGO > S/MEGO > S/aMEGO when it is listed in the order of their specific capacity, rate capability and cyclic life. And the S/RGO-CYS delivers a high reversible capacity of 455 mA h g-1 at 8 C. The excellent performance of S/RGO-CYS composite is ascribed to the sulfur-containing functional groups of the RGO-CYS, which helps the sulfur dispersion and stabilizes the dissoluble lithium polysulfides. Our results demonstrate that the surface chemistry of carbon materials plays a more important role than the SSA, pore size and pore volume for the electrochemical properties of sulfur/carbon composites for Li-S batteries.

  13. Lisäpalveluilla palkkatukityöstä ja työvoimakoulutuksesta vaikuttavampaa Tampereen seudun välityömarkkinoilla

    OpenAIRE

    Vintola, Mauri

    2011-01-01

    Tässä opinnäytetyössä tutkittiin Tampereen kaupunkiseudun välityömarkkinoilla palkkatukityön ja työvoimakoulutuksen vaikuttavuuden lisääntymistä niihin liitettävillä lisä-palveluilla. Tutkimus toteutettiin kiinteässä kontekstissa Välke-projektiin ja sen työnhakija-asiakkaisiin. Aineistonhankintamenetelmänä olivat työnhakija-asiakkaiden työllistymisen seurantatilastot. Vaikuttavuusmittarina oli työ- ja elinkeinohallinnossa käytettävä kohderyhmään kuuluvan työllisyystilanteen tarkastelu kolme k...

  14. Digitaalinen opas Osuuspankin työntekijöille tietoisuuden lisäämiseksi blockchain-teknologiasta ja sen hyödyistä

    OpenAIRE

    Kangasmäki, Meeri

    2016-01-01

    Opinnäytetyö on laadittu toimeksiantona Osuuspankille. Opinnäytetyön toimeksiannon tavoitteena oli tuottaa opas blockchain-teknologiasta ja sen hyödyistä Osuuspankin työntekijöille. Oppaan tarkoituksena on lisätä ymmärrystä blockchain-teknologian toiminnasta ja sen käyttömahdollisuuksista. Blockchain-teknologia tulee muuttamaan finanssialaa lähitulevaisuudessa ja siksi siitä on tärkeä lisätä tietoisuutta alalla työskentelevien keskuudessa. Opinnäytetyössä esitellään blockchain-teknologian...

  15. Using Evidence Based Practice in LIS Education: Results of a Test of a Communities of Practice Model

    Directory of Open Access Journals (Sweden)

    Joyce Yukawa

    2010-03-01

    Full Text Available Objective ‐ This study investigated the use of a communities of practice (CoP model for blended learning in library and information science (LIS graduate courses. The purposes were to: (1 test the model’s efficacy in supporting student growth related to core LIS concepts, practices, professional identity, and leadership skills, and (2 develop methods for formative and summative assessment using the model.Methods ‐ Using design‐based research principles to guide the formative and summative assessments, pre‐, mid‐, and post‐course questionnaires were constructed to test the model and administered to students in three LIS courses taught by the author. Participation was voluntary and anonymous. A total of 34 students completed the three courses; response rate for the questionnaires ranged from 47% to 95%. The pre‐course questionnaire addressed attitudes toward technology and the use of technology for learning. The mid‐course questionnaire addressed strengths and weaknesses of the course and suggestions for improvement. The post‐course questionnaire addressed what students valued about their learning and any changes in attitude toward technology for learning. Data were analyzed on three levels. Micro‐level analysis addressed technological factors related to usability and participant skills and attitudes. Meso‐level analysis addressed social and pedagogical factors influencing community learning. Macro‐level analysis addressed CoP learning outcomes, namely, knowledge of core concepts and practices, and the development of professional identity and leadership skills.Results ‐ The students can be characterized as adult learners who were neither early nor late adopters of technology. At the micro‐level, responses indicate that the online tools met high standards of usability and effectively supported online communication and learning. Moreover, the increase in positive attitudes toward the use of technology for learning at

  16. Comparison of the biomechanical effect of pedicle-based dynamic stabilization: a study using finite element analysis.

    Science.gov (United States)

    Jahng, Tae-Ahn; Kim, Young Eun; Moon, Kyung Yun

    2013-01-01

    Recently, nonfusion pedicle-based dynamic stabilization systems (PBDSs) have been developed and used in the management of degenerative lumbar spinal diseases. Still effects on spinal kinematics and clinical effects are controversial. Little biomechanical information exists for providing biomechanical characteristics of pedicle-based dynamic stabilization according to the PBDS design before clinical implementation. To investigate the effects of implanting PBDSs into the spinal functional unit and elucidate the differences in biomechanical characteristics according to different materials and design. The biomechanical effects of implantation of PBDS were investigated using the nonlinear three-dimensional finite element model of L4-L5. An already validated three-dimensional, intact osteoligamentous L4-L5 finite element model was modified to incorporate the insertion of pedicle screws. The implanted models were constructed after modifying the intact model to simulate postoperative changes using four different fixation systems. Four models instrumented with PBDS (Dynesys, NFlex, and polyetheretherketone [PEEK]) and rigid fixation systems (conventional titanium rod) were developed for comparison. The instrumented models were compared with those of the intact and rigid fixation model. Range of motion (ROM) in three motion planes, center of rotation (COR), force on the facet joint, and von Mises stress distribution on the vertebral body and implants with flexion-extension were compared among the models. Simulated results demonstrated that implanted segments with PBDSs have limited ROM when compared with the intact spine. Flexion motion was the most limited, and axial rotation was the least limited, after device implantation. Among the PBDS selected in this analysis, the NFlex system had the closest instantaneous COR compared with the intact model and a higher ROM compared with other PBDS. Contact force on the facet joint in extension increased with an increase of moment in

  17. Lack of Congruence between Analyses and Conclusions Limits Usefulness of Study of Socio-cultural Influences on Student Choice of LIS Field in Greece. A Review of: Moniarou-Papaconstantinou, V., Tsatsaroni, A., Katsis, A., & Koulaidis, V. (2010. LIS as a field of study: Socio-cultural influences on students’ decision making. Aslib Proceedings: New Information Perspectives, 62(3, 321-344.

    Directory of Open Access Journals (Sweden)

    Diana K. Wakimoto

    2010-09-01

    Full Text Available Objective — To determine how social and cultural factors influence students’ decision to study library and information science (LIS as undergraduates.Design — Semi-structured interviews and quantitative analysis of questionnaire data.Setting — Three schools in Greece with LIS programs at the undergraduate level.Subjects — One hundred eighty-seven first-year students enrolled in Greece’s LIS schools’ undergraduate programs in the autumn semester of the 2005-2006 academic year.Methods — The authors piloted the questionnaire with 52 students at the LIS school in Athens and had three faculty members review the questionnaire. After modification, the two-part questionnaire was administered during the first week of classes to all first-year undergraduate students enrolled in Greece’s three LIS schools. The first section of the questionnaire collected data on student gender, age, area of residence, school from which they graduated, and parental occupation and level of education. The second part of the questionnaire covered students’ reasons for choosing LIS as a field of study, the degree to which students agreed with dominant public views (i.e., stereotypes of librarianship, and practical issues that influenced students’ decision-making processes. The authors conducted two rounds of semi-structured interviews with students from the same 2005-2006 cohort. They interviewed 41 self-selected students and then interviewed a purposive sample of 15 students from the same cohort in the fifth semester of the students’ studies.Main Results — The questionnaire was completed by 187 LIS students, with 177 responses considered relevant and used in the analyses. Demographic information showed that 78% of the respondents were female, 85.8% were from urban areas, and 98.9% graduated from public schools. The authors constructed two indices to assist with further analyses: the Educational Career Index, which quantified students’ educational

  18. Laurentide ice sheet dynamics during the last glacial period

    Science.gov (United States)

    Montoya, M.; Alvarez-Solas, J.; Robinson, A.; Banderas, R.

    2016-12-01

    Heinrich events (HEs) are interpreted as the result of massive large-scale ice discharges from the Laurentice ice sheet (LIS) into the North Atlantic that occurred during the Last Glacial Period (LGP). Classically they have been attributed to internal oscillations of the LIS, a mechanism that has been mimicked using three-dimensional ice-sheet models within the Shallow Ice Approximation (SIA) together with a modified basal sliding parameterisation accounting for enhanced ice-flow over a melting ice bed. However, recent studies using hybrid ice sheet-ice shelf models with more comprehensive dynamics combining the SIA and the Shallow Shelf Approximation (SSA) have proposed an alternative explanation involving the effects of oceanic circulation changes on the ice shelves. Up to now the plausibility of internal LIS instabilities in a hybrid ice sheet-ice shelf model combining SSA and SIA has seldom been investigated. Here we address this issue in the framework of the LGP by modifying the dynamics in a hybrid ice sheet-ice shelf model to mimick two different levels of complexity. We firstly suppress the binary mode mixture of sheet and stream ice in order to mimick the SIA, and include a basal sliding parameterisation. Under constant external climate forcing, quasi-periodic LIS instabilities are simulated in response to internal basal temperature oscillations. We then consider a more realistic dynamical formulation by incorporating the treatment of ice flow under the SSA. Internal basal temperature oscillations, and thereby LIS instabilities, are found to vanish under constant external forcing. Our results demonstrate how accounting for the longitudinal stresses of the ice streams, which is not possible within the pure SIA, is critical to stabilize ice flow and prevents the occurrence of the binge-purge oscillations.

  19. The lissencephaly protein Lis1 is present in motile mammalian cilia and requires outer arm dynein for targeting to Chlamydomonas flagella

    DEFF Research Database (Denmark)

    Pedersen, Lotte B; Rompolas, Panteleimon; Christensen, Søren T

    2007-01-01

    Lissencephaly is a developmental brain disorder characterized by a smooth cerebral surface, thickened cortex and misplaced neurons. Classical lissencephaly is caused by mutations in LIS1, which encodes a WD-repeat protein involved in cytoplasmic dynein regulation, mitosis and nuclear migration. S...

  20. Testing the Benefits of Blended Education: Using Social Technology to Foster Collaboration and Knowledge Sharing in Face-to-Face LIS Courses

    Science.gov (United States)

    Agosto, Denise E.; Copeland, Andrea J.; Zach, Lisl

    2013-01-01

    Blended education, which mixes elements of face-to-face and online educational delivery, can occur at the activity, course, program, or administrative level. This study examined the use of student blogs to test the benefits of course-level blended educational delivery for LIS students enrolled in a face-to-face course. Data collected from…

  1. Mida teha Tarmo Looduse olukorras? / Lukas, Tõnis; Ginter, Jüri; Raba, Rannar; Välis, Meelis; Lunter, Alli; Otepalu, Olavi

    Index Scriptorium Estoniae

    2008-01-01

    Küsimusele vastavad haridusminister Tõnis Lukas, Tartu ülikooli haridusteaduskonna prodekaan Jüri Ginter, "Sakala" arvamustoimetaja Rannar Raba, Kullamaa keskkooli direktor Meelis Välis, Viljandi maagümnaasiumi õpetaja Alli Lunter ja Audentese gümnaasiumi õppealajuhataja Olavi Otepalu

  2. Degradation of Li/S Battery Electrodes On 3D Current Collectors Studied Using X-ray Phase Contrast Tomography.

    Science.gov (United States)

    Zielke, L; Barchasz, C; Waluś, S; Alloin, F; Leprêtre, J-C; Spettl, A; Schmidt, V; Hilger, A; Manke, I; Banhart, J; Zengerle, R; Thiele, S

    2015-06-04

    Lithium/sulphur batteries are promising candidates for future energy storage systems, mainly due to their high potential capacity. However low sulphur utilization and capacity fading hinder practical realizations. In order to improve understanding of the system, we investigate Li/S electrode morphology changes for different ageing steps, using X-ray phase contrast tomography. Thereby we find a strong decrease of sulphur loading after the first cycle, and a constant loading of about 15% of the initial loading afterwards. While cycling, the mean sulphur particle diameters decrease in a qualitatively similar fashion as the discharge capacity fades. The particles spread, migrate into the current collector and accumulate in the upper part again. Simultaneously sulphur particles lose contact area with the conducting network but regain it after ten cycles because their decreasing size results in higher surface areas. Since the capacity still decreases, this regain could be associated with effects such as surface area passivation and increasing charge transfer resistance.

  3. Attainable gravimetric and volumetric energy density of Li-S and li ion battery cells with solid separator-protected Li metal anodes.

    Science.gov (United States)

    McCloskey, Bryan D

    2015-11-19

    As a result of sulfur's high electrochemical capacity (1675 mA h/gs), lithium-sulfur batteries have received significant attention as a potential high-specific-energy alternative to current state-of-the-art rechargeable Li ion batteries. For Li-S batteries to compete with commercially available Li ion batteries, high-capacity anodes, such as those that use Li metal, will need to be enabled to fully exploit sulfur's high capacity. The development of Li metal anodes has focused on eliminating Coulombically inefficient and dendritic Li cycling, and to this end, an interesting direction of research is to protect Li metal by employing mechanically stiff solid-state Li(+) conductors, such as garnet phase Li7La3Zr2O12 (LLZO), NASICON-type Li1+xAlxTi2-x(PO4)3 (LATP), and Li2S-P2S5 glasses (LPS), as electrode separators. Basic calculations are used to quantify useful targets for solid Li metal protective separator thickness and cost to enable Li metal batteries in general and Li-S batteries specifically. Furthermore, maximum electrolyte-to-sulfur ratios that allow Li-S batteries to compete with Li ion batteries are calculated. The results presented here suggest that controlling the complex polysulfide speciation chemistry in Li-S cells with realistic, minimal electrolyte loading presents a meaningful opportunity to develop Li-S batteries that are competitive on a specific energy basis with current state-of-the-art Li ion batteries.

  4. N-Acetyl-D-Glucosamine Kinase Interacts with Dynein-Lis1-NudE1 Complex and Regulates Cell Division.

    Science.gov (United States)

    Sharif, Syeda Ridita; Islam, Ariful; Moon, Il Soo

    2016-09-01

    N-acetyl-D-glucosamine kinase (GlcNAc kinase or NAGK) primarily catalyzes phosphoryl transfer to GlcNAc during amino sugar metabolism. Recently, it was shown NAGK interacts with dynein light chain roadblock type 1 (DYNLRB1) and upregulates axo-dendritic growth, which is an enzyme activity-independent, non-canonical structural role. The authors examined the distributions of NAGK and NAGK-dynein complexes during the cell cycle in HEK293T cells. NAGK was expressed throughout different stages of cell division and immunocytochemistry (ICC) showed NAGK was localized at nuclear envelope, spindle microtubules (MTs), and kinetochores (KTs). A proximity ligation assay (PLA) for NAGK and DYNLRB1 revealed NAGK-dynein complex on nuclear envelopes in prophase cells and on chromosomes in metaphase cells. NAGK-DYNLRB1 PLA followed by Lis1/NudE1 immunostaining showed NAGK-dynein complexes were colocalized with Lis1 and NudE1 signals, and PLA for NAGK-Lis1 showed similar signal patterns, suggesting a functional link between NAGK and dynein-Lis1 complex. Subsequently, NAGK-dynein complexes were found in KTs and on nuclear membranes where KTs were marked with CENP-B ICC and nuclear membrane with lamin ICC. Furthermore, knockdown of NAGK by small hairpin (sh) RNA was found to delay cell division. These results indicate that the NAGK-dynein interaction with the involvements of Lis1 and NudE1 plays an important role in prophase nuclear envelope breakdown (NEB) and metaphase MT-KT attachment during eukaryotic cell division.

  5. Response of Global Lightning Activity Observed by the TRMM/LIS During Warm and Cold ENSO Phases

    Science.gov (United States)

    Chronis, Themis G.; Cecil, Dan; Goodman, Steven J.; Buechler, Dennis

    2007-01-01

    This paper investigates the response of global lightning activity to the transition from the warm (January February March-JFM 1998) to the cold (JFM 1999) ENSO phase. The nine-year global lightning climatology for these months from the Tropical Rainfall Measuring Mission (TRMM) Lightning Imaging Sensor (LIS) provides the observational baseline. Flash rate density is computed on a 5.0x5.0 degree lat/lon grid within the LIS coverage area (between approx.37.5 N and S) for each three month period. The flash rate density anomalies from this climatology are examined for these months in 1998 and 1999. The observed lightning anomalies spatially match the documented general circulation features that accompany the warm and cold ENSO events. During the warm ENSO phase the dominant positive lightning anomalies are located mostly over the Western Hemisphere and more specifically over Gulf of Mexico, Caribbean and Northern Mid-Atlantic. We further investigate specifically the Northern Mid-Atlantic related anomaly features since these show strong relation to the North Atlantic Oscillation (NAO). Furthermore these observed anomaly patterns show strong spatial agreement with anomalous upper level (200 mb) cold core cyclonic circulations. Positive sea surface temperature anomalies during the warm ENSO phase also affect the lightning activity, but this is mostly observed near coastal environments. Over the open tropical oceans, there is climatologically less lightning and the anomalies are less pronounced. Warm ENSO related anomalies over the Eastern Hemisphere are most prominent over the South China coast. The transition to the cold ENSO phase illustrates the detected lightning anomalies to be more pronounced over East and West Pacific. A comparison of total global lightning between warm and cold ENSO phase reveals no significant difference, although prominent regional anomalies are located over mostly oceanic environments. All three tropical "chimneys" (Maritime Continent, Central

  6. Dynamics

    CERN Document Server

    Goodman, Lawrence E

    2001-01-01

    Beginning text presents complete theoretical treatment of mechanical model systems and deals with technological applications. Topics include introduction to calculus of vectors, particle motion, dynamics of particle systems and plane rigid bodies, technical applications in plane motions, theory of mechanical vibrations, and more. Exercises and answers appear in each chapter.

  7. Ultramicroporous Carbon through an Activation-Free Approach for Li-S and Na-S Batteries in Carbonate-Based Electrolyte.

    Science.gov (United States)

    Hu, Lei; Lu, Yue; Zhang, Tianwen; Huang, Tao; Zhu, Yongchun; Qian, Yitai

    2017-04-26

    We report an activation-free approach for fabricating ultramicroporous carbon as an accommodation of sulfur molecules for Li-S and Na-S batteries applications in carbonate-based electrolyte. Because of the high specific surface area of 967 m(2) g(-1), as well as 51.8% of the pore volume is contributed by ultramicropore with pore size less than 0.7 nm, sulfur cathode exhibits superior electrochemical behavior in carbonate-based electrolyte with a capacity of 507.9 mA h g(-1) after 500 cycles at 2 C in Li-S batteries and 392 mA h g(-1) after 200 cycles at 1 C in Na-S batteries, respectively.

  8. The cerrado of Goiás in the literature of Bernardo Élis, from a viewpoint of environmental history.

    Science.gov (United States)

    Silva, Sandro Dutra E; Bandeira, Aurea Marchetti; Tavares, Giovana Galvão; Murari, Luciana

    2017-01-01

    This article analyzes the representations of nature in the literature of Bernardo Élis based on the theoretical and methodological assumptions of environmental history. Élis was part of a group of intellectuals whose literature presented the living conditions in the frontier of Goiás and the human relationships occurring in these landscapes. In these scrublands, the dramas of their characters are mixed with the physical environment of the cerrado region in a realistic narrative denouncing the living conditions in this isolated frontier area. In their dialog with literature, the fundamentals of this field of historiographic research can be adopted as analytical instruments, combined with concepts related to the integration between society and nature, such as the frontier and wilderness.

  9. Desempenho de lisímetro de pesagem hidráulica de baixo custo no semi-árido nordestino

    OpenAIRE

    2008-01-01

    Medidas diretas de evapotranspiração de referência são importantes na avaliação e na calibração de métodos indiretos. Avaliou-se o desempenho de lisímetro de pesagem hidráulica de baixo custo, visando à determinação direta da evapotranspiração de referência (ETo), em área de assentamento rural no Semi-Árido nordestino. O lisímetro é de concepção simplificada, com travesseiros hidráulicos confeccionados com mangueira flexível de butil e revestida em náilon, interligados a um sistema manométric...

  10. La formación de la pólis en la Grecia Antigua: autonomía del campesinado, subordinación de las aldeas

    Directory of Open Access Journals (Sweden)

    Julián Gallego

    2012-03-01

    Full Text Available Se estudia el desarrollo de la pólis griega y sus bases sociales de origen aldeano. Se em-prende primeramente un cotejo de los conceptos de campesino y farmer para sopesar qué catego-ría resulta más apropiada para analizar a los pequeños productores antiguos. A partir de esto se revisa el testimonio de Hesíodo en Trabajos y días sobre la existencia de una situación de depen-dencia del campesinado. Por último, se examinan los cambios provocados por la subordinación de las aldeas a la ciudad, considerando la participación política de los labradores y el rol de la al-dea como subdivisión cívica de la pólis

  11. Liquid-type cathode enabled by 3D sponge-like carbon nanotubes for high energy density and long cycling life of Li-S batteries.

    Science.gov (United States)

    Pu, Xiong; Yang, Gang; Yu, Choongho

    2014-11-26

    High energy density and long-term stability of Li-S batteries are achieved by employing a 3D sponge-like carbon nanotube cathode and a liquid-type polysulfide catholyte. Carbon nanotubes not only provide excellent electron pathways and polysulfide reservoirs, but they can also be used as a standalone cathode without current collectors, which greatly alleviates problems arising from insulating sulfur and polysulfide shuttles as well as remarkably increasing the energy density.

  12. EVALUATION OF THE CONFORMITY OF CARDIOVASCULAR THERAPY TO CURRENT CLINICAL GUIDELINES IN THE IMPROVEMENT OF OUTCOMES IN PATIENTS AFTER STROKE (ACCORDING TO THE LIS-2 REGISTER

    Directory of Open Access Journals (Sweden)

    A. Yu. Suvorov

    2015-01-01

    Full Text Available Aim. To study the conformity of preventative therapy prescribed to patients during a hospital stay and at a discharge to clinical guidelines using a special algorithm, and to assess the impact of the results on a long-term mortality based on the LIS-2 register (Lyubertsy study of mortality in patients after cerebral stroke.Material and methods. The scales to assess the quality of cardiovascular care for the prevention of recurrent stroke along with the prevention of recurrent ischemic attacks index (PRIA index for this assessment were developed according to current clinical guidelines. Analysis of the therapy was performed using PRIA index on survived hospital patients from LIS-2 register (N=753. The impact of PRIA index results on a long-term mortality (Me=2.3 years was studied.Results. Based upon the results of the assessment obtained with PRIA index, higher treatment conformity to clinical guidelines resulted in a significantly better long-term survival. Non-conformity to clinical guidelines was due to the lack of prescription of drugs with proven efficacy and irrational choice of preventive therapy. Median of treatment quality assessment was 44.4% (22.2; 44.4.Conclusion. Low conformity of preventive therapy to clinical guidelines is found in the LIS-2 register. The algorithm for the assessment of preventive cardiovascular therapy quality allows identifying limitations in the prevention of recurrent stroke, and can serve as an example of implementation of evidence-based medicine in clinical practice.

  13. Sulfur enriched carbon nanotubols with a Poly(3,4-ethylenedioxypyrrole) coating as cathodes for long-lasting Li-S batteries

    Science.gov (United States)

    Mukkabla, Radha; Meduri, Praveen; Deepa, Melepurath; Shivaprasad, S. M.; Ghosal, Partha

    2017-02-01

    Lithium-sulfur (Li-S) batteries are technologically significant for sulfur is cheap, and offers high gravimetric capacity and a large energy density. But achieving long term cyclability with moderate capacity loss, and scalability pose formidable challenges. A solution phase approach for the preparation of a composite of sulfur with hydroxyl groups functionalized multiwalled carbon nanotubes (MWCNTols) and coated with poly(3,4-ethylenedioxypyrrole) (PEDOP) is presented for the first time. Comparison of the Li-S performances at 0.1 C current-rate show that the S based cell with a S-loading of 80% retains a low capacity of 122 mAh gsulfur-1 after 100 cycles, whereas cells with S/MWCNTols and S/MWCNTols/PEDOP composites with sulfur loadings of 73 and 70% respectively, retain capacities of 384 and 624 mAh gsulfur-1 after 200 charge-discharge cycles, with Coulombic efficiencies of 96 and 98.7% respectively. This performance differential illustrates the role of PEDOP in inhibiting sulfur loss and in maximizing cell response. The polymer provides electrical interconnects between the insulating sulfur clusters and facilitates Li+ transfer at the interface. The ease of the synthesis, coupled with the remarkable cycling performance delivered by this composite at a high sulfur-loading, demonstrate the promise that this S/CNT/conducting polymer composite has for practical Li-S batteries.

  14. Nanoscale Polysulfides Reactors Achieved by Chemical Au-S Interaction: Improving the Performance of Li-S Batteries on the Electrode Level.

    Science.gov (United States)

    Fan, Chao-Ying; Xiao, Pin; Li, Huan-Huan; Wang, Hai-Feng; Zhang, Lin-Lin; Sun, Hai-Zhu; Wu, Xing-Long; Xie, Hai-Ming; Zhang, Jing-Ping

    2015-12-23

    In this work, the chemical interaction of cathode and lithium polysulfides (LiPSs), which is a more targeted approach for completely preventing the shuttle of LiPSs in lithium-sulfur (Li-S) batteries, has been established on the electrode level. Through simply posttreating the ordinary sulfur cathode in atmospheric environment just for several minutes, the Au nanoparticles (Au NPs) were well-decorated on/in the surface and pores of the electrode composed of commercial acetylene black (CB) and sulfur powder. The Au NPs can covalently stabilize the sulfur/LiPSs, which is advantageous for restricting the shuttle effect. Moreover, the LiPSs reservoirs of Au NPs with high conductivity can significantly control the deposition of the trapped LiPSs, contributing to the uniform distribution of sulfur species upon charging/discharging. The slight modification of the cathode with <3 wt % Au NPs has favorably prospered the cycle capacity and stability of Li-S batteries. Moreover, this cathode exhibited an excellent anti-self-discharge ability. The slight decoration for the ordinary electrode, which can be easily accessed in the industrial process, provides a facile strategy for improving the performance of commercial carbon-based Li-S batteries toward practical application.

  15. Inhibiting the shuttle effect of Li-S battery with a graphene oxide coating separator: Performance improvement and mechanism study

    Science.gov (United States)

    Jiang, Yong; Chen, Fang; Gao, Yang; Wang, Yanyan; Wang, Shanshan; Gao, Qiang; Jiao, Zheng; Zhao, Bing; Chen, Zhiwen

    2017-02-01

    In this paper, graphene oxide (GO) is integrated on commercial polypropylene separator by tape casting method and sandwiched between a sulfur cathode and the separator as a shuttle inhibitor of the Li-S battery. The issues of lithium polysulfides dissolution and shuttle effect are inhibited distinctly, and significant improvements not only in the active material utilization but also in capacity retention are observed. What's more, the improvement mechanism is studied in detail. The results demonstrate that the sulfur and polysulfide species in separator and electrolyte for the cell with GO-coating separator are much less than that with the pristine separator. The GO membrane still maintains three-dimensional porous and flexible structure with a few lithium polysulfides and Li2S2/Li2S nanoparticles anchored on the surface and inter-layers of GO sheets after long cycles. And the active materials are significantly localized within the cathode structure after GO-coating. In addition, less sulfate species, lithium salts, polysulfides and other insoluble species are identified on the cathode and separator after long-term cycling.

  16. Advances in surface ion suppression from RILIS: Towards the Time-of-Flight Laser Ion Source (ToF-LIS)

    CERN Document Server

    Rothe, S; Crepieux, B; Day Goodacre, T; Fedosseev, V N; Giles, T; Marsh, B A; Ramos, J P; Rossel, R E

    2016-01-01

    We present results from the development towards the Time-of-Flight Laser Ion Source (ToF-LIS) aiming for the suppression of isobaric contaminants through fast beam gating. The capability to characterize high resistance ion sources has been successfully demonstrated. A ninefold selectivity gain has been achieved through suppression of surface ionized potassium, while maintaining >90% transmission for laser-ionized gallium using a thin wall graphite ionizer cavity combined with a fast beam gate. Initial results from the investigation of glassy carbon as a potential hot cavity ion source are presented. Power-cycle tests of a newly designed mount for fragile ion source cavities indicates its capability to survive the thermal stress expected during operation in an ISOLDE target unit. Finally, we introduce fast ion beam switching at a rate of 10 kHz using the ISOLDE ion beam switchyard as a new concept for ion beam distribution and conclude by highlighting the potential applications of this ion beam multiplexing te...

  17. ALDF Data Retrieval Algorithms for Validating the Optical Transient Detector (OTD) and the Lightning Imaging Sensor (LIS)

    Science.gov (United States)

    Koshak, W. J.; Blakeslee, R. J.; Bailey, J. C.

    1997-01-01

    A linear algebraic solution is provided for the problem of retrieving the location and time of occurrence of lightning ground strikes from in Advanced Lightning Direction Finder (ALDF) network. The ALDF network measures field strength, magnetic bearing, and arrival time of lightning radio emissions and solutions for the plane (i.e.. no Earth curvature) are provided that implement all of these measurements. The accuracy of the retrieval method is tested using computer-simulated data sets and the relative influence of bearing and arrival time data on the outcome of the final solution is formally demonstrated. The algorithm is sufficiently accurate to validate NASA's Optical Transient Detector (OTD) and Lightning Imaging System (LIS). We also introduce a quadratic planar solution that is useful when only three arrival time measurements are available. The algebra of the quadratic root results are examined in detail to clarify what portions of the analysis region lead to fundamental ambiguities in source location. Complex root results are shown to be associated with the presence of measurement errors when the lightning source lies near an outer sensor baseline of the ALDF network. For arbitrary noncollinear network geometries and in the absence of measurement errors, it is shown that the two quadratic roots are equivalent (no source location ambiguity) on the outer sensor baselines. The accuracy of the quadratic planar method is tested with computer-generated data sets and the results are generally better than those obtained from the three station linear planar method when bearing errors are about 2 degrees.

  18. Review on developments in LIS (laser ion source) at the IPPLM and its possible applications in photonics

    Science.gov (United States)

    Gasior, P.; Rosinski, M.

    2013-10-01

    One of the techniques which had the biggest impact on the development of microelectronics, optoelectronics, photonics and other similar technologies was doping the substrates with various elements. Although many techniques have been developed resulting in reliable industrial designs, still there is a need of further development and optimization of some of them for specific applications. A very interesting method of doping is the ion implantation based on LIS (Laser Ion Source). The great advantage of this method is its ability to implant ions from any solid state material onto any substrate. Besides - a control of the laser irradiation parameters gives also a flexibility in the parameters of the implantation process, i.e. the ion energy which corresponds to the implantation depth and the ion flux which results in the concentration. On the other hand there are also drawbacks of the direct method - usually the power density of the laser beam needs to be higher than that offered by standard industrial solution and together with the dopant the contaminations present in the projectile are implanted. Another issue for the applications requiring high precision of the implanted layer depth and width is the relatively broad energy spread of the laser produced ions. To deal with this problems the research at the IPPLM was focused on the extent characterization of laser produced ion streams in the direct variant of the method and optimization of the method with the application of electrostatic field to accelerate, focus and shape the ion beams.

  19. A facile and scalable method to prepare carbon nanotube-grafted-graphene for high performance Li-S battery

    Science.gov (United States)

    Wang, Q. Q.; Huang, J. B.; Li, G. R.; Lin, Z.; Liu, B. H.; Li, Z. P.

    2017-01-01

    A carbon nanotube-grafted-graphene (CNT-g-Gr) is developed for enhancements of electrical conduction and polysulfide (PS) absorption to improve rate performance and cycleability of lithium-sulfur battery. The CNT-g-Gr is prepared through CNT growth on Ni-deposited graphene sheet which is fabricated via pyrolysis of glucose in a molten salt. The obtained CNT-g-Gr shows much higher specific surface area and PS adsorption capability than graphene. The in-situ formed Ni nanoparticles on graphene sheet not only serve as the catalytic sites for CNT growth, but also function as the anchor-sites for polar PS absorption. The CNT-g-Gr contributes a superb PS adsorption capability arising from graphene and CNT absorbing weakly-polar PS species, and Ni nanoparticles absorbing the species with stronger polarity. The resultant Li-S battery with the CNT-g-Gr shows excellent cycleability and rate performance. A stable discharge capacity of 900 mAh g-1 (with low capacity degradation rate) and a rate capacity of 260 mAh g-1 at 30 C discharge rate have been achieved.

  20. Graphene-based three-dimensional hierarchical sandwich-type architecture for high-performance Li/S batteries.

    Science.gov (United States)

    Chen, Renjie; Zhao, Teng; Lu, Jun; Wu, Feng; Li, Li; Chen, Junzheng; Tan, Guoqiang; Ye, Yusheng; Amine, Khalil

    2013-10-09

    A multiwalled carbon nanotube/sulfur (MWCNT@S) composite with core-shell structure was successfully embedded into the interlay galleries of graphene sheets (GS) through a facile two-step assembly process. Scanning and transmission electron microscopy images reveal a 3D hierarchical sandwich-type architecture of the composite GS-MWCNT@S. The thickness of the S layer on the MWCNTs is ~20 nm. Raman spectroscopy, X-ray diffraction, thermogravimetric analysis, and energy-dispersive X-ray analysis confirm that the sulfur in the composite is highly crystalline with a mass loading up to 70% of the composite. This composite is evaluated as a cathode material for Li/S batteries. The GS-MWCNT@S composite exhibits a high initial capacity of 1396 mAh/g at a current density of 0.2C (1C = 1672 mA/g), corresponding to 83% usage of the sulfur active material. Much improved cycling stability and rate capability are achieved for the GS-MWCNT@S composite cathode compared with the composite lacking GS or MWCNT. The superior electrochemical performance of the GS-MWCNT@S composite is mainly attributed to the synergistic effects of GS and MWCNTs, which provide a 3D conductive network for electron transfer, open channels for ion diffusion, strong confinement of soluble polysulfides, and effective buffer for volume expansion of the S cathode during discharge.

  1. Sulfur impregnated N, P co-doped hierarchical porous carbon as cathode for high performance Li-S batteries

    Science.gov (United States)

    Cai, Junjie; Wu, Chun; Zhu, Ying; Zhang, Kaili; Shen, Pei Kang

    2017-02-01

    A nitrogen and phosphorus co-doped hierarchical porous carbon (N, P-HPC) were fabricated by simply pyrolysis of polyaniline aerogels in the presence of phytic acid and subsequently activation treatment by KOH. The as-prepared N, P-HPC with a highly interconnected network structure and possesses a large surface area and pore volume is very favor in the impregnation of sulfur. Moreover, simultaneously introduced nitrogen and phosphorous into the carbon could create more active sites than the mono-doped carbons, the synergistic effects of dual activation of carbon atoms induced stronger chemical adsorption ability. Benefiting from the advantages of suitable hierarchical porosity, high conductivity, fast ion transportation, physical and chemical adsorption of the N, P-HPC, the Sulfur/N, P-HPC composite exhibits high initial discharge capacity of 1116 mAh g-1 at 0.1 C (1 C = 1675 mA g-1, based on sulfur content) and high rate capability of 550 mAh g-1 at 2C, as well as excellent long term cycling stability at a current rate of 1 C with only 0.058% capacity decay per cycle for over 500 cycles. Such a high capacity and stability suggests that the novel cathode have alluring prospect for Li-S batteries.

  2. Covalent bond glued sulfur nanosheet-based cathode integration for long-cycle-life Li-S batteries.

    Science.gov (United States)

    Wang, Lei; Dong, Zhihui; Wang, Dong; Zhang, Fengxing; Jin, Jian

    2013-01-01

    High-capacity electrochemical active material-based electrodes for lithium ion batteries (LIBs), such as sulfur (S), always face the collapse of the electrode due to the big volume change during insertion of the lithium (Li) ion and therefore shorten the cycle life of the cells. Herein, a series of design from the viewpoint of both individual components and the entire cathode in lithium-sulfur (Li-S) cell was introduced aiming at addressing the issues of poor conductivity, leakage of intermediate polysulphides, and large volumetric expansion upon insertion of the Li ion. In the designed electrode, polydopamine (PD)-coated S nanosheets (NSs) were used as active materials, carboxylic acid functionalized multiwall carbon nanotube (MWCNT-COOH) as conductive additives, and poly(acrylic acid) (PAA) as binders. Far different from the traditional hydrogen bond and/or van der Waals force linked electrodes, stronger covalent bonds formed by cross-linking of PD/MWCNT-COOH and PD/PAA into amide bonds, respectively, were built throughout the whole electrode to firmly integrate all of the individual components in the electrode together. As a result, the cathode demonstrated excellent cyclic performance with a charge capacity of 640 mAh/g after 500 cycles at a current density of 1 A/g. Besides, the charge capacity decay after 500 cycles is as small as 0.021% per cycle, which represents the best capacity retention so far.

  3. Advances in surface ion suppression from RILIS: Towards the Time-of-Flight Laser Ion Source (ToF-LIS)

    Energy Technology Data Exchange (ETDEWEB)

    Rothe, S., E-mail: sebastian.rothe@cern.ch [CERN, Geneva (Switzerland); Catherall, R.; Crepieux, B. [CERN, Geneva (Switzerland); Day Goodacre, T. [CERN, Geneva (Switzerland); School of Physics and Astronomy, The University of Manchester, Manchester (United Kingdom); Fedosseev, V.N.; Giles, T.; Marsh, B.A. [CERN, Geneva (Switzerland); Ramos, J.P. [CERN, Geneva (Switzerland); Laboratory of Powder Technology, EPFL, Lausanne (Switzerland); Rossel, R.E. [CERN, Geneva (Switzerland); Institut für Physik, Johannes Gutenberg-Universität, Mainz (Germany); Faculty of Design, Computer Science and Media, Hochschule RheinMain, Wiesbaden (Germany)

    2016-06-01

    We present results from the development towards the Time-of-Flight Laser Ion Source (ToF-LIS) aiming for the suppression of isobaric contaminants through fast beam gating. The capability to characterize high resistance ion sources has been successfully demonstrated. A ninefold selectivity gain has been achieved through suppression of surface ionized potassium, while maintaining >90% transmission for laser-ionized gallium using a thin wall graphite ionizer cavity combined with a fast beam gate. Initial results from the investigation of glassy carbon as a potential hot cavity ion source are presented. Power-cycle tests of a newly designed mount for fragile ion source cavities indicates its capability to survive the thermal stress expected during operation in an ISOLDE target unit. Finally, we introduce fast ion beam switching at a rate of 10 kHz using the ISOLDE ion beam switchyard as a new concept for ion beam distribution and conclude by highlighting the potential applications of this ion beam multiplexing technique.

  4. Infection with bacteroides thetaiotaomicron during posterior decompression and dynamic stabilization of the lumbar spine: a case report and review of the literature.

    Science.gov (United States)

    Agarwal, Nitin; Hansberry, David R; Goldstein, Ira M

    2014-08-01

    Patient and surgical risk factors have often been implicated for postoperative posterior spinal wound infection. A 56-year-old male with widely disseminated multiple myeloma presented with severe back pain and lower extremity weakness as a result of fracture and collapse of the L4 vertebral body. Posterior decompression involving bilateral pedicle resection and partial L4 corpectomy was performed. Stabilization was performed by Dynesys instrumentation of L3-5, screw supplementation with polymethylmethacrylate, and posterolateral fusion was performed. Postoperatively, the patient suffered from multiple infections, including Bacteroides thetaiotaomicron, which were eventually resolved with antibiotic as well as incision and debridement treatment regimens. In cases with numerous perioperative risk factors for infections, the best therapeutic approach may be a preventative one. An understanding of the relevant risk factors may enable the physician to facilitate a perioperative condition best suited for optimal treatment. A case report of infection with Bacteroides thetaiotaomicron during lumbar decompression and dynamic stabilization as well as a review of the literature regarding infection risk factors are presented.

  5. Significantly improved long-cycle stability in high-rate Li-S batteries enabled by coaxial graphene wrapping over sulfur-coated carbon nanofibers.

    Science.gov (United States)

    Lu, Songtao; Cheng, Yingwen; Wu, Xiaohong; Liu, Jie

    2013-06-12

    Long-term instability of Li-S batteries is one of their major disadvantages compare to other secondary batteries. The reasons for the instability include dissolution of polysulfide intermediates and mechanical instability of the electrode film caused by volume changes during charging/discharging cycles. In this paper, we report a novel graphene-sulfur-carbon nanofibers (G-S-CNFs) multilayer and coaxial nanocomposite for the cathode of Li-S batteries with increased capacity and significantly improved long-cycle stability. Electrodes made with such nanocomposites were able to deliver a reversible capacity of 694 mA h g(-1) at 0.1C and 313 mA h g(-1) at 2C, which are both substantially higher than electrodes assembled without graphene wrapping. More importantly, the long-cycle stability was significantly improved by graphene wrapping. The cathode made with G-S-CNFs with a initial capacity of 745 mA h g(-1) was able to maintain ~273 mA h g(-1) even after 1500 charge-discharge cycles at a high rate of 1C, representing an extremely low decay rate (0.043% per cycle after 1500 cycles). In contrast, the capacity of an electrode assembled without graphene wrapping decayed dramatically with a 10 times high rate (~0.40% per cycle after 200 cycles). These results demonstrate that the coaxial nanocomposites are of great potential as the cathode for high-rate rechargeable Li-S batteries. Such improved rate capability and cycle stability could be attributed to the unique coaxial architecture of the nanocomposite, in which the contributions from graphene and CNFs enable electrodes with improved electrical conductivity, better ability to trap soluble the polysulfides intermediate and accommodate volume expansion/shrinkage of sulfur during repeated charge/discharge cycles.

  6. Efficient Synthesis of Graphene Nanoscrolls for Fabricating Sulfur-Loaded Cathode and Flexible Hybrid Interlayer toward High-Performance Li-S Batteries.

    Science.gov (United States)

    Guo, Yi; Zhao, Gang; Wu, Naiteng; Zhang, Yun; Xiang, Mingwu; Wang, Bo; Liu, Heng; Wu, Hao

    2016-12-21

    A modified lyophilization approach is developed and used for highly efficient transformation of 2D graphene oxide sheet into 1D graphene nanoscroll (GNS) with high topological transforming efficiency (∼94%). Because of the unique open tubular structure and large specific surface area (545 m(2) g(-1)), GNS is utilized for the first time as a porous cathode scaffold for encapsulating sulfur with a high loading (81 wt %), and also as a conductive skeleton for assembling MnO2 nanowires into a flexible free-standing hybrid interlayer, both enabling high-rate and long-life Li-S battery.

  7. Metal-Organic Framework with Aromatic Rings Tentacles: High Sulfur Storage in Li-S Batteries and Efficient Benzene Homologues Distinction.

    Science.gov (United States)

    Li, Meng-Ting; Sun, Yu; Zhao, Kai-Sen; Wang, Zhao; Wang, Xin-Long; Su, Zhong-Min; Xie, Hai-Ming

    2016-12-07

    We designed and fabricated a fluorophore-containing tetradentate carboxylate ligand-based metal-organic framework (MOF) material with open and semiopen channels, which acted as the host for sulfur trapped in Li-S batteries and sensor of benzene homologues. These channels efficiently provide a π-π* conjugated matrix for the charge transfer and guest molecule trapping. The open channel ensured a much higher loading quantitative of sulfur (S content-active material, 72 wt %; electrode, 50.4 wt %) than most of the MOF/sulfur composites, while the semiopen channel possessing aromatic rings tentacles guaranteed an outstanding specific discharge capacity (1092 mA h g(-1) at 0.1 C) accompanied by good cycling stability. To our surprise, benefiting from special π-π* conjugated conditions, compound 1 could be a chemical sensor for benzene homologues, especially for 1,2,4-trimethylbenzene (1,2,4-TMB). This is the first example of MOFs materials serving as a sensor of 1,2,4-TMB among benzene homologues. Our works may be worthy of use for references in other porous materials systems to manufacture more long-acting Li-S batteries and sensitive chemical sensors.

  8. Conductive Carbon Network inside a Sulfur-Impregnated Carbon Sponge: A Bioinspired High-Performance Cathode for Li-S Battery.

    Science.gov (United States)

    Du, Xue-Li; You, Ya; Yan, Yang; Zhang, Dawei; Cong, Huai-Ping; Qin, Haili; Zhang, Chaofeng; Cao, Fei-Fei; Jiang, Ke-Cheng; Wang, Yan; Xin, Sen; He, Jian-Bo

    2016-08-31

    A highly conductive sulfur cathode is crucial for improving the kinetic performance of a Li-S battery. The encapsulation of sulfur in porous nanocarbons is expected to benefit the Li(+) migration, yet the e(-) conduction is still to be improved due to a low graphitization degree of a conventional carbon substrate, especially that pyrolyzed from carbohydrates or polymers. Aiming at facilitating the e(-) conduction in the cathode, here we propose to use ketjen black, a highly graphitized nanocarbon building block to form a conductive network for electrons in a biomass-derived, hierarchically porous carbon sponge by a easily scaled-up approach at a low cost. The specifically designed carbon host ensures a high loading and good retention of active sulfur, while also provides a faster electron transmission to benefit the lithiation/delithiation kinetics of sulfur. The sulfur cathode prepared from the carbon network shows excellent cycling and rate performance in a Li-S battery, rendering its practicality for emerging energy storage opportunities such as grids or automobiles.

  9. Lisímetro de pesagem de grande porte.: desenvolvimento e calibração A large-scale weighting lysimeter. part I: development and calibration

    Directory of Open Access Journals (Sweden)

    Luiz F. M. de S. Campeche

    2011-05-01

    Full Text Available A evapotranspiração de plantas frutíferas foi medida a partir da instalação e calibração de um lisímetro de pesagem de grande porte. O equipamento, composto por caçamba metálica em aço carbono, possui arquitetura circular com área de 5,72 m² e massa total de 10,5 toneladas. Uma muda de coqueiro anão-verde foi transplantada para o lisímetro e mantida sob as mesmas condições de solo e adubação do campo experimental. Na automação do processo foi utilizado o mecanismo de alívio de carga baseado em sistemas de alavancas e contrapesos, apoiado em uma célula de carga com capacidade de 200 kg e precisão de 0,02% de sua capacidade. Os dados de saída da célula de carga foram armazenados em um coletor automático de dados tipo data logger. A relação entre a variação de massa e a voltagem da célula de carga do lisímetro é descrita adequadamente por modelo linear com mínima histerese. A metodologia empregada na instalação e na calibração do lisímetro foi adequada, obtendo-se um coeficiente de determinação de 0,99 na equação de calibração. Os resultados ainda indicam que o lisímetro de pesagem pode ser utilizado com êxito na determinação de evapotranspiração de plantas frutíferas de grande porte.The objectives of present study were to develop and to calibrate a large-scale weighing lysimeter in order to estimate evapotranspiration of fruit plants. The equipment consisted of a metallic bucket (steel carbon of circular design with total area of 5.72 m² and total mass of 10.5 t. A seedling of dwarf-green coconut palm was transplanted in lysimeter and maintained under same fertilization conditions of experimental field. For automation of the process, a mechanism of load relief based on systems of levers and counterbalances was used, leaning in a load cell with capacity of 200 kg and precision of 0.02% of its capacity. The output data of load cell were stored in an automatic data acquisition system. The

  10. Instalação, calibração e funcionamento de um lisímetro de pesagem Instalation, calibration and operation of a weighing lysimeter

    Directory of Open Access Journals (Sweden)

    Daniel F. Carvalho

    2007-08-01

    Full Text Available Este trabalho teve como objetivo construir, instalar, calibrar e avaliar a sensibilidade de um lisímetro de pesagem com célula de carga, instalado em Seropédica - RJ, a fim de determinar a evapotranspiração de referência (ETo. O lisímetro, com dimensões de 1,0 m x 1,0 m e 0,7 m de profundidade, foi construído com chapas de aço galvanizado e instalado sobre estrutura metálica montada sobre barras transversais, a fim de concentrar toda a massa do conjunto sobre uma célula de carga localizada no centro do sistema. Após o preenchimento do lisímetro com solo, foi realizada a calibração do mesmo por meio de análise de regressão linear, e toda a área foi plantada com grama-batatais. O conjunto lisimétrico instalado mostrou-se adequado para a estimativa da ETo, apresentando erro-padrão de estimativa da regressão de 0,278 kg ou 0,278 mm, além de responder às variações dos principais elementos meteorológicos que influenciam na ETo.The objective of this work was to construct, install, calibrate and evaluate a weighing lysimeter with load cell, in order to estimate reference evapotranspiration (ETo for the Seropédica region - RJ. The lysimeter, which has the dimensions of 1.0 m x 1.0 m and 0.7 m in depth, was built with galvanized steel and installed over a metallic structure mounted over transversal bars, in order to concentrate all the assembly mass over a load cell localized in the center of the system. The lysimeter was filled with the same soil layers of the local soil. Then a calibration was carried out by means of a linear regression analysis and the whole lysimeter area was planted with Bahia grass. The lysimeter system demonstrated to be suitable for estimating ETo, yielding a standard error of the linear regression of 0.278 kg or 0.278 mm. In addition, it displayed satisfactorily the variation of the main meteorological elements that influence in ETo.

  11. THE CAPABILITIES OF A REGISTER AS A QUALITY CONTROL OF THE PHARMACOTHERAPY IN OUTPATIENTS AT HIGH RISK OF CARDIOVASCULAR COMPLICATIONS (THE "LIS-1" REGISTER

    Directory of Open Access Journals (Sweden)

    M. L. Ginzburg

    2015-09-01

    Full Text Available Aim. To evaluate the frequency of the prescription of cardiovascular drugs in patients before the reference acute myocardial infarction (AMI based on the register "LIS-1" (Lubertsy mortality study of patients after myocardial infarction.Material and methods. Stage 1: development of the Register of patients with AMI admitted to cardiology departments of hospitals in Luberets district, Moscow region (2005-2007 and discharged for outpatient treatment. Median follow-up – 1.6 years (1.0, 2.4. The primary endpoint – total mortality. Stage 2: the continuation of register "LIS-1" (2011-2012.Results.1133 patients (mean age of men 60.1±0.5, women – 71.4±0.4 years were included in the 1st stage of the study; 172 (15.2% died in the hospital. Before the reference hospitalization 21.4% of patients had been receiving b-blockers, 35.3% - renin-angiotensin-aldosterone system (RAAS inhibitors, 15.7% - antiplatelet agents, 1.9% - statins, 13% of patients - diuretics. Statistically significant (adjusted for sex and age positive impact on hospital mortality reduction had a treatment with b-blockers [OR=0.542, CI=0.357-0.824, p=0.004] and RAAS inhibitors [OR=0.710; CI=0.512-0.986, p=0.040] prior to the development of acute myocardial infarction. As the number of patients receiving statins and antiplatelet agents was small, the contribution these drugs intake on hospital mortality was not identified. 272 patients (mean age 63.6±12.6 years were included on the second phase of the study. The information about the received therapy before reference hospitalization was reported by 173 patients: 39% of patients used b-blockers, 47% - RAAS inhibitors, 37% - antiplatelet agents, 15% - statins, 15% of patients - diuretics. Positive changes in the frequency of the prescription of essential drugs were observed in 5 years: a significant increase in number of patients with b-blockers (p<0.001, RAAS inhibitors (p<0.01, antiplatelet agents (p<0.05 and statins (p<0.001. The

  12. THE CAPABILITIES OF A REGISTER AS A QUALITY CONTROL OF THE PHARMACOTHERAPY IN OUTPATIENTS AT HIGH RISK OF CARDIOVASCULAR COMPLICATIONS (THE "LIS-1" REGISTER

    Directory of Open Access Journals (Sweden)

    M. L. Ginzburg

    2014-01-01

    Full Text Available Aim. To evaluate the frequency of the prescription of cardiovascular drugs in patients before the reference acute myocardial infarction (AMI based on the register "LIS-1" (Lubertsy mortality study of patients after myocardial infarction.Material and methods. Stage 1: development of the Register of patients with AMI admitted to cardiology departments of hospitals in Luberets district, Moscow region (2005-2007 and discharged for outpatient treatment. Median follow-up – 1.6 years (1.0, 2.4. The primary endpoint – total mortality. Stage 2: the continuation of register "LIS-1" (2011-2012.Results.1133 patients (mean age of men 60.1±0.5, women – 71.4±0.4 years were included in the 1st stage of the study; 172 (15.2% died in the hospital. Before the reference hospitalization 21.4% of patients had been receiving b-blockers, 35.3% - renin-angiotensin-aldosterone system (RAAS inhibitors, 15.7% - antiplatelet agents, 1.9% - statins, 13% of patients - diuretics. Statistically significant (adjusted for sex and age positive impact on hospital mortality reduction had a treatment with b-blockers [OR=0.542, CI=0.357-0.824, p=0.004] and RAAS inhibitors [OR=0.710; CI=0.512-0.986, p=0.040] prior to the development of acute myocardial infarction. As the number of patients receiving statins and antiplatelet agents was small, the contribution these drugs intake on hospital mortality was not identified. 272 patients (mean age 63.6±12.6 years were included on the second phase of the study. The information about the received therapy before reference hospitalization was reported by 173 patients: 39% of patients used b-blockers, 47% - RAAS inhibitors, 37% - antiplatelet agents, 15% - statins, 15% of patients - diuretics. Positive changes in the frequency of the prescription of essential drugs were observed in 5 years: a significant increase in number of patients with b-blockers (p<0.001, RAAS inhibitors (p<0.01, antiplatelet agents (p<0.05 and statins (p<0.001. The

  13. discussion on Structure Modes of LIS in Large-scale Hospitals%大型医院检验信息系统架构模式探讨

    Institute of Scientific and Technical Information of China (English)

    徐玲; 刘长兴

    2013-01-01

      针对大型医院的实验室,比较检验信息系统C/S和B/S两种架构的特点和不同,并结合本院实际讨论B/S模式下系统的优点。%Comparisons are made in this paper between two structure modes of LIS(Laboratory Information Management System) in large-scale hospitals - C/S(client/server) and B/S(browser/server) in the aspects of characteristics and differences. Advantages of B/S mode is also discussed in combination of the actual practice in General Hospital of Jinan Military Command.

  14. Porous Carbon Mat as an Electrochemical Testing Platform for Investigating the Polysulfide Retention of Various Cathode Configurations in Li-S Cells.

    Science.gov (United States)

    Chung, Sheng-Heng; Singhal, Richa; Kalra, Vibha; Manthiram, Arumugam

    2015-06-18

    Two optimized cathode configurations (a porous current collector and an interlayer) are utilized to determine the better architecture for improving the cycle stability and reversibility of lithium-sulfur (Li-S) cells. The electrochemical analysis on the upper-plateau discharge capacity (QH) and the lower-plateau discharge capacity (QL) is introduced for assessing, respectively, the polysulfide retention and the electrochemical reactivity of the cell. The analysis results in line with the expected materials chemistry principles suggest that the interlayer configuration offers stable cell performance for sulfur cathodes. The significance of the interlayer is to block the free migration of the dissolved polysulfides, which is a key factor for immobilizing and continuously utilizing the active material in sulfur cathodes. Accordingly, the carbon mat interlayers provide sulfur cathodes with a high discharge capacity of 864 mA h g(-1) at 1 C rate with a high capacity retention rate of 61% after 400 cycles.

  15. Acetylene Black/Sulfur Composites Synthesized by a Solution Evaporation Concentration Crystallization Method and Their Electrochemical Properties for Li/S Batteries

    Directory of Open Access Journals (Sweden)

    Zhigao Yang

    2013-07-01

    Full Text Available A novel technique to prepare carbon/sulfur composites as cathode materials for Li/S batteries is proposed, which we call the ‘solution evaporation concentration crystallization’ method. Three composites with different S loadings were prepared, subject to two different solvent evaporation rates from acetylene black (AB/sulfur in carbon disulfide solutions. X-ray diffraction, environmental scanning electron microscopy, transmission electron microscopy, and Brunauer-Emmett-Teller measurements all show that the porous AB structure is well-filled with S. Composites prepared at a lower solvent evaporation rate with 50 wt % S content, had good electrochemical properties, with 1609.67 mAh g−1 after 100 cycles. Composites with better dispersibility at a low solvent evaporation rate can effectively prevent polysulfide from dissolving in the electrolyte, and serve to stabilize the structure of the S cathode during the charge-discharge process.

  16. O destino de Lisístrata. Uma adaptação para o cinema da comédia de Aristófanes

    OpenAIRE

    Duarte,Adriane da Silva

    2011-01-01

    Nesse artigo faz-se uma análise do episódio“Lisístrata”, dirigido por Christian-Jaque para o filme Destinode Mulher (Destinées, França, 1954), uma adaptaçãopara o cinema da comédia homônima composta porAristófanes em 411 a. C. Estudou-se o episódio em seucontexto, atentando para os pressupostos que determinarama adaptação da peça grega, bem como a sua recepção noséculo XX. Especulou-se sobre outras possibilidades de transpora comédia grega para o cinema, exemplificando com achanchada Carnaval...

  17. How neurons migrate: a dynamic in-silico model of neuronal migration in the developing cortex

    LENUS (Irish Health Repository)

    Setty, Yaki

    2011-09-30

    Abstract Background Neuronal migration, the process by which neurons migrate from their place of origin to their final position in the brain, is a central process for normal brain development and function. Advances in experimental techniques have revealed much about many of the molecular components involved in this process. Notwithstanding these advances, how the molecular machinery works together to govern the migration process has yet to be fully understood. Here we present a computational model of neuronal migration, in which four key molecular entities, Lis1, DCX, Reelin and GABA, form a molecular program that mediates the migration process. Results The model simulated the dynamic migration process, consistent with in-vivo observations of morphological, cellular and population-level phenomena. Specifically, the model reproduced migration phases, cellular dynamics and population distributions that concur with experimental observations in normal neuronal development. We tested the model under reduced activity of Lis1 and DCX and found an aberrant development similar to observations in Lis1 and DCX silencing expression experiments. Analysis of the model gave rise to unforeseen insights that could guide future experimental study. Specifically: (1) the model revealed the possibility that under conditions of Lis1 reduced expression, neurons experience an oscillatory neuron-glial association prior to the multipolar stage; and (2) we hypothesized that observed morphology variations in rats and mice may be explained by a single difference in the way that Lis1 and DCX stimulate bipolar motility. From this we make the following predictions: (1) under reduced Lis1 and enhanced DCX expression, we predict a reduced bipolar migration in rats, and (2) under enhanced DCX expression in mice we predict a normal or a higher bipolar migration. Conclusions We present here a system-wide computational model of neuronal migration that integrates theory and data within a precise

  18. ELVES Research at the Pierre Auger Observatory: Optical Emission Simulation and Time Evolution, WWLLN-LIS-Auger Correlations, and Double ELVES Observations and Simulation.

    Science.gov (United States)

    Merenda, K. D.

    2016-12-01

    Since 2013, the Pierre Auger Cosmic Ray Observatory in Mendoza, Argentina, extended its trigger algorithm to detect emissions of light consistent with the signature from very low frequency perturbations due to electromagnetic pulse sources (ELVES). Correlations with the World Wide Lightning Location Network (WWLLN), the Lightning Imaging Sensor (LIS) and simulated events were used to assess the quality of the reconstructed data. The FD is a pixel array telescope sensitive to the deep UV emissions of ELVES. The detector provides the finest time resolution of 100 nanoseconds ever applied to the study of ELVES. Four eyes, separated by approximately 40 kilometers, consist of six telescopes and span a total of 360 degrees of azimuth angle. The detector operates at night when storms are not in the field of view. An existing 3D EMP Model solves Maxwell's equations using a three dimensional finite-difference time-domain model to describe the propagation of electromagnetic pulses from lightning sources to the ionosphere. The simulation also provides a projection of the resulting ELVES onto the pixel array of the FD. A full reconstruction of simulated events is under development. We introduce the analog signal time evolution comparison between Auger reconstructed data and simulated events on individual FD pixels. In conjunction, we will present a study of the angular distribution of light emission around the vertical and above the causative lightning source. We will also contrast, with Monte Carlo, Auger double ELVES events separated by at most 5 microseconds. These events are too short to be explained by multiple return strokes, ground reflections, or compact intra-cloud lightning sources. Reconstructed ELVES data is 40% correlated to WWLLN data and an analysis with the LIS database is underway.

  19. The main factors affecting the long-term outcomes in patients after acute cerebrovascular disorder: results of the LIS-2 study

    Directory of Open Access Journals (Sweden)

    S. Yu. Martsevich

    2016-01-01

    Full Text Available Aim. To evaluate the long-term prognosis of life in patients after cerebral stroke (MI and to identify the main factors influencing it.Material and methods. All patients (n=960 who had MI or transient ischemic attack in the period from 01.01.2009 to 31.12.2011, admitted to Lyubertsy district hospital №2, were included into the register of LIS-2. The primary endpoint was total mortality of patients.Results. The average age of patients was 72±9 years, 2/3 were women. 207 patients (21.7% died in the hospital, 753 were discharged from the hospital. Median follow-up was 2.8 (2.1, 3.5 years. 31.5% of the patients died during this period. The main cause of death (36% was re-MI, and 22.4% of patients died from the heart failure. The relative risk (RR of death was significantly increased with the age of patients (RR=1.1. The probability of death increased in the presence of diabetes mellitus (RR=1.4, alcohol abuse (RR=2.3, any signs of consciousness disorders in the acute phase of MI (RR=1.6, heart failure (RR=1.6, atrial fibrillation (RR=1.4. Patients who were treated with calcium channel blockers before admission to the hospital, had a lower risk of death than those who did not receive these drugs (RR=0.4. Prescription of ACE inhibitors at discharge from the hospital reduced significantly the risk of death in the long-term period (RR=0.7.Conclusion. High rate of long-term mortality in the LIS-2 register can be largely explained by the poor quality of primary and secondary prevention of cardiovascular events.

  20. THE WAY OF ASSESSING THE ADHERENCE TO MODERN DRUG THERAPY CLINICAL GUIDELINES AIMED AT REDUCING THE RISK OF RECURRENT STROKE (ACCORDING TO THE LIS-2 REGISTER

    Directory of Open Access Journals (Sweden)

    A. Yu. Suvorov

    2015-09-01

    Full Text Available Aim. To develop a method for the assessment of quality of medical prevention of recurrent stroke and its’ testing using the results of the LIS-2 register (Lyubertsy study of mortality in patients after stroke.Material and methods. The scale evaluation of the quality of therapy for the prevention of recurrent stroke developed in accordance with the modern clinical practice guidelines, as well as the recurrent stroke prevention index (RSPI for this assessment were elaborated. The analysis of the therapy was performed in patients after stroke in LIS-2 registers (n=219. The assessment of the quality of treatment was performed using RSPI, the influence of the index results on the in-hospital mortality was studied.Results. Two groups of patients [with RSPI=0 (n=137 and RSPI>0 (n=82] were formed on the basis of the results evaluation via RSPI. Significant differences between groups were not found. At the same time higher in-hospital mortality (p=0.014; χ2 Pearson was detected in patients with RSPI=0; relative risk of in-hospital death (after adjustment for sex and age was 2.04 [1.07-3.91] (p=0.031. Analysis of the length of survival and duration of hospital stay was performed in both groups using the Kaplan-Meier method. In-hospital mortality was significantly higher in patients with RSPI=0, which was confirmed by the log-rank test (p=0.032.Conclusion. The results of the quality of medical care assessment in accordance with the developed method are significantly related to the outcomes during the stay in a hospital. The developed method, based on current clinical recommendations, can serve as an example of the implementation of evidence-based medicine in actual practice.

  1. Utilização do lisímetro de drenagem para obtenção do “Kc” da mamoneira em plantio adensado

    Directory of Open Access Journals (Sweden)

    W. L. Miranda

    2016-01-01

    Full Text Available A cultura da mamona é considerada resistente a deficiências hídricas, no entanto, apresenta considerável incremento de produtividade quando submetida à irrigação. Para o adequado manejo da irrigação um dos critérios passíveis de serem adotados baseia-se na evapotranspiração da cultura (ETc e para tanto torna-se necessário o conhecimento do valor do coeficiente de cultura (Kc. Com o presente trabalho objetivou-se determinar o Kc da mamoneira em plantio adensado, no período de safrinha, utilizando-se lisímetro de drenagem. Foram utilizados três lisímetros de drenagem, com dimensões de 1,2 m de comprimento, 1,4 m de largura e 1,2 m de profundidade. Nos lisímetros foram plantadas oito mudas de mamoneira da cultivar Al Guarany 2002 com espaçamento de 0,3 m entre plantas e 0,7 m entre linhas. A ETc foi contabilizada no intervalo de 5 a 12 dias, conforme se observou o fim da drenagem. A evapotranspiração de referência (ETo foi estimada pela equação de Penman-Monteith-FAO. A partir da relação ETc/ETo obteve-se o Kc para os diferentes períodos ao longo do ciclo da cultura. Os valores de ETc encontrados nas fases inicial, de crescimento, intermediária e final foram 1,65; 3,07; 9,14 e 5,85 mm d-1 respectivamente. Os valores de Kc para as fases mencionadas foram 0,98; 1,41; 2,11 e 1,65 respectivamente.Use of drainage lysimeter for obtaining Kc of castor bean in dense plantationAbstract: Castor bean culture is considered resistant to water deficit. However, it presents considerable increase in productivity when submitted to irrigation. For the adequate irrigation management, one of the criterion considered is based on the crop evapotranspiration (ETc and is necessary for finding the crop coefficient (Kc value. With the present work, we aimed at determining the Kc of the castor bean in dense plantation, during the off-season, using a drainage lysimeter. Three drainage lysimeters, with dimensions of 1.2 m of length, 1.4 m of width

  2. Lisân-I Osmânî” Üzerine Bir İnceleme A Surveying of Book Called Lisân-ı Osmânî

    Directory of Open Access Journals (Sweden)

    Onur AKBAŞ

    2013-03-01

    Dadım Darılır (Mama, Nanny will Scold, comedy, serial, 1919STUDY-MONOGRAPHY: Lisan-ı Osmanî (The Ottoman Language, 1914, Lisan-ı Edebiyat (The Language of Literature, 1914, Recaizade Ekrem (Recaizade Ekrem, 1924, Mesalik-i Edebiye (Ways of Literature, 1928, Namık Kemal (Namık Kemal, 1930, Lisanımız (Our Language, 1930.2Also we are going to investigate (research his book called “Lisân-I Osmânî” on our this study. Tanzimat’ın birinci dönemi, edebi türlerde sureta eskiye bağlı kalmakla beraber içerik itibariyle yeni temlerin ele alındığı bir edebiyattı. Dilde sadeleşmeyi ve sanatı toplumun ve ideolojinin emrine vermeyi gaye edinen birinci dönem edebiyatının üç saç ayağından biri elbet de Namık Kemal’dir. Ancak yenileşme süreci bu anlayış üzerine devam etmeyecek birinci dönem Tanzimatçılarının tezgahından geçen ikinci dönem Tanzimatçıları “Güzel olan her şey sanatın konusu olabilir…” (R. Mahmut Ekrem düşüncesiyle sanatı ön plana çıkardılar. İşte o anlayışın yetiştirdiği isimlerden biri de Namık Kemal’in oğlu Ali Ekrem Bolayır’dı. Sadeleşme karşısında aruzun ve Osmanlıca’nın önemli savunucularından olan Bolayır, babasının yenilik adına dokunmadığı şiirin şeklini savunmasıyla tanınan bir şairdir. 1867’de İstanbul’da doğdu. Namık Kemal’in oğludur. İlköğrenimine Hûbyâr mahalle mektebinde başladı. Fatih Askeri Rüştiyesi’ne bir müddet devam ettikten sonra oradan alınarak özel hocalar yardımıyla eğitimini tamamlamış Arapça, farsça ve Fransızca dersleri almış, dokuz-on yaşlarında şiirle uğraşmaya başlamıştır. Padişahın delaletiyle saraya mabeyn katibi olan Ali Ekrem, Mabeyn’de on sekiz yıl çalışmıştır.1906 yılında Kudüs Mutasarrıflığı’na gönderildi. İkinci Meşrutiyet’in ilanından sonra Beyrut Valiliği’ne terfi ettirilmişse de üç gün sonra bu görevinden istifa ederek İstanbul’a d

  3. Binding S0.6 Se0.4 in 1D Carbon Nanofiber with CS Bonding for High-Performance Flexible Li-S Batteries and Na-S Batteries.

    Science.gov (United States)

    Yao, Yu; Zeng, Linchao; Hu, Shuhe; Jiang, Yu; Yuan, Beibei; Yu, Yan

    2017-03-29

    A one-step synthesis procedure is developed to prepare flexible S0.6 Se0.4 @carbon nanofibers (CNFs) electrode by coheating S0.6 Se0.4 powder with electrospun polyacrylonitrile nanofiber papers at 600 °C. The obtained S0.6 Se0.4 @CNFs film can be used as cathode material for high-performance Li-S batteries and room temperature (RT) Na-S batteries directly. The superior lithium/sodium storage performance derives from its rational structure design, such as the chemical bonding between Se and S, the chemical bonding between S0.6 Se0.4 and CNFs matrix, and the 3D CNFs network. This easy one-step synthesis procedure provides a feasible route to prepare electrode materials for high-performance Li-S and RT Na-S batteries.

  4. [Review of:] Context: Nature, Impact, and Role; 5th International Conference on Conceptions of Library and Information Science, CoLIS 2005, Glasgow 2005; Proceedings. Eds.: Fabio Crestani, Ian Ruthven. Berlin: Springer, 2005. xiii, 250 S., ISBN 3-540-26178-8

    OpenAIRE

    2006-01-01

    Book review of Context: Nature, Impact, and Role; 5th International Conference on Conceptions of Library and Information Science, CoLIS 2005, Glasgow 2005; Proceedings. Eds.: Fabio Crestani, Ian Ruthven. Berlin: Springer, 2005. xiii+250p., ISBN 3-540-26178-8 (pbk). This is volume 3507 of "Lecture Notes in Computer Science" (LNCS). It contains the papers of the 5th CoLIS meeting, most of them rather sophisticated, and makes an interesting reading.

  5. LYUBERTSY STUDY ON MORTALITY RATE IN PATIENTS AFTER CEREBRAL STROKE OR TRANSIENT ISCHEMIC ATTACK (LIS-2. DESIGN AND MEDICAL TREATMENT ESTIMATION

    Directory of Open Access Journals (Sweden)

    S. A. Boytsov

    2013-01-01

    Full Text Available Aim. Estimation of social, demographic and anamnestic characteristics of patients survived cerebral stroke as well as the medical treatment received by the patients before the reference stroke in the hospital and at discharge within the framework of the stroke register LIS-2 (study of mortality among patients survived stroke in Lyubertsy district.Material and methods. All the patients (637 persons admitted to the Lyubertsy regional hospital №2 due to stroke from 01.01.2009 to 31.12.2010 were enrolled into the study.Results. 36% were men and 64% were women with mean age of 70.99Ѓ}9.6 years old. 554 (87.0% patients had history of arterial hypertension and 155 (24.3% – of atrial fibrillation.147 (23.1% patients had previous stroke. In-hospital mortality made up 21.8% (mean age of 139 deceased patients was 72.7Ѓ}9.6 years old. 374 (75% patients were prescribed ACE inhibitors, 421 (85% - antiplatelet agents, 4 (1% – warfarin. Statins intake was recommended to 3 (1% patients. Conclusion. We revealed low frequency of prescription of drugs with proven positive prognostic value in patients after stroke.

  6. B, N-co-doped graphene supported sulfur for superior stable Li-S half cell and Ge-S full battery.

    Science.gov (United States)

    Cai, Wenlong; Zhou, Jianbin; Li, Gaoran; Zhang, Kailong; Liu, Xianyu; Wang, Can; Zhou, Heng; Zhu, Yongchun; Qian, Yitai

    2016-10-03

    B, N-co-doped graphene supported sulfur (S@BNG) composite is synthesized by using melamine diborate as precursor. XPS spectra illustrates that BNG with a high percentage and dispersive B, N (B: 13.47 %, N: 9.17 %) and abundant pyridinic-N and N-B/N=B bond, which show strong interaction with Li2Sx proved by simulation experiments. As cathode for Li-S half cell, S@BNG with a sulfur content of 75 % displays a high capacity of 765 mA h g-1 at 1 C even after 500 cycles with a low fading rate of 0.027 % per cycle. Even at a high sulfur loading of 4.73 mg cm-2, S@BNG still shows a high reversible areal capacity of 3.5 mA h cm-2 after 50 cycles. When S@BNG composite as cathode combines with high performance lithiated Ge anode (discharge capacity of 1138 mA h g-1 at 1 C over 1000 cycles in half cell), the assembled Ge-S full battery exhibits a superior capacity of 530 mA h g-1 at 1 C over 500 cycles.

  7. CHARACTERISTICS OF PATIENTS WITH CEREBRAL STROKE OR TRANSIENT ISCHEMIC ATTACK, INCLUDED INTO THE LIS-2 REGISTER (LYUBERTSY STUDY OF MORTALITY IN PATIENTS AFTER STROKE

    Directory of Open Access Journals (Sweden)

    S. Yu. Martsevich

    2015-01-01

    Full Text Available Aim. To provide final data on the three-year period of the inclusion of patients; to give most accurate "portrait" of patients hospitalized with a brain stroke within the framework of the LIS-2 register (Lyubertsy study of mortality in patients after stroke.Material and methods. All patients (n=960 admitted to the Lyubertsy district hospital №2 with stroke for the period from 01.2009 to 12.2011 were included into the study.Results. Men accounted for 37.5%, women - 62.5%, mean age was 71.1±9.8 years. The history of hypertension was present in 833 patients (86.8%, atrial fibrillation in 252 (26.8% patients, 199 (20.7% patients had previously undergone stroke. In-hospital mortality was 21.6% (207 patients had died; mean age 72.9±9.8 years. Low frequency of the antihypertensive therapy (34.5%, lipid-lowering therapy (0.7%, antiplatelet agents (5.7%, anticoagulation therapy prescription in patients with atrial fibrillation was detected.Conclusion. Insufficient assignment of drugs with a proven effect on the prognosis in patients with risk factors prior to the development of the reference stroke draws attention. High incidence of recurrent strokes indicates an underactive secondary prevention.

  8. Burning lithium in CS2 for high-performing compact Li2 S-graphene nanocapsules for Li-S batteries

    Science.gov (United States)

    Tan, Guoqiang; Xu, Rui; Xing, Zhenyu; Yuan, Yifei; Lu, Jun; Wen, Jianguo; Liu, Cong; Ma, Lu; Zhan, Chun; Liu, Qi; Wu, Tianpin; Jian, Zelang; Shahbazian-Yassar, Reza; Ren, Yang; Miller, Dean J.; Curtiss, Larry A.; Ji, Xiulei; Amine, Khalil

    2017-07-01

    Tremendous efforts have been made to design the cathode of Li-S batteries to improve their energy density and cycling life. However, challenges remain in achieving fast electronic and ionic transport while accommodating the significant cathode volumetric change, especially for the cathode with a high practical mass loading. Here we report a cathode architecture, which is constructed by burning lithium foils in a CS2 vapour. The obtained structure features crystalline Li2S nanoparticles wrapped by few-layer graphene (Li2S@graphene nanocapsules). Because of the improvement on the volumetric efficiency for accommodating sulfur active species and electrical properties, the cathode design enables promising electrochemical performance. More notably, at a loading of 10 mgLi2S cm-2, the electrode exhibits a high reversible capacity of 1,160 mAh g-1s, namely, an area capacity of 8.1 mAh cm-2. Li2S@graphene cathode demonstrates a great potential for Li-ion batteries, where the Li2S@graphene-cathode//graphite-anode cell displays a high capacity of 730 mAh g-1s as well as stable cycle performance.

  9. A (inelegibilidade feminina na Academia Brasileira de Letras: Carolina Michaëlis e Amélia Beviláqua Feminine (ineligibility in the Brazilian Academy of Letters: Carolina Michaëlis and Amélia Beviláqua's experiences

    Directory of Open Access Journals (Sweden)

    Michele Asmar Fanini

    2010-06-01

    Full Text Available A Academia Brasileira de Letras erigiu-se como um ambiente refratário à presença feminina. Embora mantida fora de cogitação durante seus primeiros oitenta anos de existência, a questão da "elegibilidade feminina" não deixou de integrar a pauta de algumas das sessões acadêmicas. Destarte, o presente artigo objetiva iluminar este tema, tendo em vista os bastidores de dois importantes episódios ocorridos, respectivamente, em 1911 e 1930, quais sejam: a cogitação do nome da filóloga Carolina Michaëlis para integrar o quadro de sócios correspondentes da "Casa de Machado de Assis" e a proposta oficial de candidatura encaminhada por Amélia Beviláqua, primeira mulher a tentar concorrer a uma vaga entre os membros efetivos da agremiação.The Brazilian Academy of Letters emerged as an environment resistant to the presence of women. Although it was unthinkable during its first eighty years of existence, the question of "feminine eligibility" did make the agenda of some of the academic sessions. The present article seeks to shed light on this issue by taking a backstage look at two key episodes, from 1911 and 1930, respectively: the consideration of the philologist Carolina Michaëlis as a candidate to the board of non-effective members of the House of Machado de Assis and the official candidacy of Amélia Beviláqua, the first woman to vie for a seat among the effective members of the academy.

  10. Cartographie et éducation populaire Cartografia e educação popular. O Museu Cartográfico de Élisée Reclus e Charles Perron em Genebra (1907-1922 Cartografía y educación popular. El Museo Cartográfico de Élisée Reclus y Charles Perron en Ginebra (1907-1922 Cartography and popular education. The Cartographic Museum by Élisée Reclus and Charles Perron in Geneva (1907-1922

    Directory of Open Access Journals (Sweden)

    Federico Ferretti

    2012-11-01

    Full Text Available Cet article aborde la constitution du Musée Cartographique de la Ville de Genève, ouvert entre 1907 et 1922 à partir du fonds cartographique de Charles Perron et d’Élisée Reclus. À travers l’analyse de sources édites et inédites, nous reconstruisons cette expérience en nous interrogeant sur le rapport entre géographie et éducation populaire, et sur le rôle de la cartographie dans la démarche de ces géographes.Reclus, histoire de la cartographie, histoire de l’éducation géographiqueEste artigo trata da constituição do Museu Cartográfico da Cidade de Genebra, aberto de 1907 a 1922 a partir do fundo cartográfico de Charles Perron e Élisée Reclus. Nos reconstruímos esta experiência pela análise de fontes publicadas e inéditas, problematizando a relação entre geografia e educação popular, e o papel da cartografia nas concepções científicas destes geógrafos.Este artículo trata de la constitución del Museo Cartográfico de la Ciudad de Ginebra, abierto entre 1907 y 1922 con base en el fondo cartográfico de Charles Perron y Élisée Reclus. Reconstruimos esta experiencia a través del análisis de fuentes publicadas e inéditas, problematizando la relación entre geografía y educación popular, y el papel de la cartografía en las concepciones científicas de estos geógrafos.This paper deals with the foundation of the Cartographic Museum of Geneva, open from 1907 to 1922 and based on the cartographic collection of Charles Perron and Élisée Reclus. We reconstruct this experience by the analysis of edited and unedited sources, questioning the relationship between geography and popular education, and the role of cartography in the scientific strategy of these geographers.

  11. Graphene/single-walled carbon nanotube hybrids: one-step catalytic growth and applications for high-rate Li-S batteries.

    Science.gov (United States)

    Zhao, Meng-Qiang; Liu, Xiao-Fei; Zhang, Qiang; Tian, Gui-Li; Huang, Jia-Qi; Zhu, Wancheng; Wei, Fei

    2012-12-21

    The theoretically proposed graphene/single-walled carbon nanotube (G/SWCNT) hybrids by placing SWCNTs among graphene planes through covalent C-C bonding are expected to have extraordinary physical properties and promising engineering applications. However, the G/CNT hybrids that have been fabricated differ greatly from the proposed G/SWCNT hybrids because either the covalent C-C bonding is not well constructed or only multiwalled CNTs/carbon nanofibers rather than SWCNTs are available in the hybrids. Herein, a novel G/SWCNT hybrid was successfully fabricated by a facile catalytic growth on layered double hydroxide (LDH) at a high temperature over 950 °C. The thermally stable Fe nanoparticles and the uniform structure of the calcined LDH flakes are essential for the simultaneously catalytic deposition of SWCNTs and graphene. The SWCNTs and the CVD-grown graphene, as well as the robust connection between the SWCNTs and graphene, facilitated the construction of a high electrical conductive pathway. The internal spaces between the two stacked graphene layers and among SWCNTs offer room for sulfur storage. Therefore, the as obtained G/SWCNT-S cathode exhibited excellent performance in Li-S batteries with a capacity as high as 650 mAh g(-1) after 100 cycles even at a high current rate of 5 C. Such a novel G/SWCNT hybrid can serve not only as a prototype to shed light on the chemical principle of G/CNT synthesis but also as a platform for their further applications in the area of nanocomposites, heterogeneous catalysis, drug delivery, electrochemical energy storage, and so on.

  12. Avaliação da evapotranspiração de referência (ETo) na Bacia experimental do Riacho Gameleira - PE, utilizazndo lisímetro de pesagem hidráulica e métodos indiretos

    OpenAIRE

    2007-01-01

    A evapotranspiração é de suma importância ao balanço hídrico, originando demandas crescentes de informações quantitativas que proporcionem o planejamento hídrico de forma sustentável. Este trabalho determina a evapotranspiração de referência (ETo) na bacia experimental do riacho Gameleira PE, utilizando lisímetro de pesagem hidráulica e métodos indiretos. A bacia experimental do riacho Gameleira está inserida na bacia do rio Tapacurá, localizada na parte Nordeste da Mesoregiã...

  13. Dynamic stabilization for L4-5 spondylolisthesis: comparison with minimally invasive transforaminal lumbar interbody fusion with more than 2 years of follow-up.

    Science.gov (United States)

    Kuo, Chao-Hung; Chang, Peng-Yuan; Wu, Jau-Ching; Chang, Hsuan-Kan; Fay, Li-Yu; Tu, Tsung-Hsi; Cheng, Henrich; Huang, Wen-Cheng

    2016-01-01

    OBJECTIVE In the past decade, dynamic stabilization has been an emerging option of surgical treatment for lumbar spondylosis. However, the application of this dynamic construct for mild spondylolisthesis and its clinical outcomes remain uncertain. This study aimed to compare the outcomes of Dynesys dynamic stabilization (DDS) with minimally invasive transforaminal lumbar interbody fusion (MI-TLIF) for the management of single-level spondylolisthesis at L4-5. METHODS This study retrospectively reviewed 91 consecutive patients with Meyerding Grade I spondylolisthesis at L4-5 who were managed with surgery. Patients were divided into 2 groups: DDS and MI-TLIF. The DDS group was composed of patients who underwent standard laminectomy and the DDS system. The MI-TLIF group was composed of patients who underwent MI-TLIF. Clinical outcomes were evaluated by visual analog scale for back and leg pain, Oswestry Disability Index, and Japanese Orthopaedic Association scores at each time point of evaluation. Evaluations included radiographs and CT scans for every patient for 2 years after surgery. RESULTS A total of 86 patients with L4-5 spondylolisthesis completed the follow-up of more than 2 years and were included in the analysis (follow-up rate of 94.5%). There were 64 patients in the DDS group and 22 patients in the MI-TLIF group, and the overall mean follow-up was 32.7 months. Between the 2 groups, there were no differences in demographic data (e.g., age, sex, and body mass index) or preoperative clinical evaluations (e.g., visual analog scale back and leg pain, Oswestry Disability Index, and Japanese Orthopaedic Association scores). The mean estimated blood loss of the MI-TLIF group was lower, whereas the operation time was longer compared with the DDS group (both p spondylolisthesis at L4-5. DDS might be an alternative to standard arthrodesis in mild lumbar spondylolisthesis. However, unlike fusion, dynamic implants have issues of wearing and loosening in the long term

  14. Solution ionic strength engineering as a generic strategy to coat graphene oxide (GO) on various functional particles and its application in high-performance lithium-sulfur (Li-S) batteries.

    Science.gov (United States)

    Rong, Jiepeng; Ge, Mingyuan; Fang, Xin; Zhou, Chongwu

    2014-02-12

    A generic and facile method of coating graphene oxide (GO) on particles is reported, with sulfur/GO core-shell particles demonstrated as an example for lithium-sulfur (Li-S) battery application with superior performance. Particles of different diameters (ranging from 100 nm to 10 μm), geometries, and compositions (sulfur, silicon, and carbon) are successfully wrapped up by GO, by engineering the ionic strength in solutions. Importantly, our method does not involve any chemical reaction between GO and the wrapped particles, and therefore, it can be extended to vast kinds of functional particles. The applications of sulfur/GO core-shell particles as Li-S battery cathode materials are further investigated, and the results show that sulfur/GO exhibit significant improvements over bare sulfur particles without coating. Galvanic charge-discharge test using GO/sulfur particles shows a specific capacity of 800 mAh/g is retained after 1000 cycles at 1 A/g current rate if only the mass of sulfur is taken into calculation, and 400 mAh/g if the total mass of sulfur/GO is considered. Most importantly, the capacity decay over 1000 cycles is less than 0.02% per cycle. The coating method developed in this study is facile, robust, and versatile and is expected to have wide range of applications in improving the properties of particle materials.

  15. Librarian and LIS Faculty Participation in Self-Archiving Practice Needs Improvement. A Review of: Xia, J., Wilhoite, S. K., & Myers, R. L. (2011. A “librarian-LIS faculty” divide in open access practice. Journal of Documentation, 67(5, 791-805. doi:10.1108/00220411111164673

    Directory of Open Access Journals (Sweden)

    Annie M. Hughes

    2012-06-01

    Full Text Available Objective – To compare librarian and LISfaculty open access (OA self-archivingbehavior.Design – Logistical Regression Analysis.Setting – Twenty top-ranked library andinformation science journals published in 2006.Subjects – A total of 812 research articles inLIS journals.Methods – For the purpose of data collection,the researchers first compiled a list of libraryand information science journals utilizingJournal Citation Reports (JCR from 2006.Twenty journals were selected by consideringimpact factor and the list compiled waschecked against Ulrich’s Periodicals Directoryfollowing a similar methodology utilized in a2007 article by Anita Coleman. The sampleincluded was representative of both libraryand information science journals, and therewere exclusions of 3 types of journals: freeonline journals where OA participation couldnot be measured; subscription based journalsthat do not supply free articles; and annualreview journals. Here, OA participation or OApractice is considered to be author selfarchivingof articles that are not freelyavailable online. Research articles wereincluded in the sample; however, editorialsand book reviews were excluded. Theresearchers also collected information aboutthe article itself, including the title, name of thejournal and name of the author. Only firstauthor’s status as librarian or LIS faculty wasconsidered in data collection. One difficulty in collecting data about the authors was that their professional status was not always clear. The researchers collected information on whether the author’s status was librarian or faculty; when an author’s status was unclear, researchers searched online to determine it. If the author’s status still could not be determined via online searching, the authors chose to exclude those articles.After the articles were collected, Google Scholar was searched in order to determine OA status. The articles that were deemed OA were opened and if the article was

  16. The LIS Blogosphere Contains Tags that Can Be Categorized and It Disseminates Professional Content. A Review of: Aharony, N. (2009. Librarians and information scientists in the blogosphere: An exploratory analysis. Library & Information Science Research, 31(3, 174‐181.

    Directory of Open Access Journals (Sweden)

    Virginia Wilson

    2010-03-01

    Full Text Available Objective – This study analyzes library and information studies (LIS oriented blogs to determine the content, and looks at tags and folksonomies of these blogs to determine whether they form a consistent, coherent scheme or whether they are lacking in internal logic.Design – A qualitative content analysis of tags assigned to 30 LIS blogs.Setting – The research took place on the internet from May to July, 2008.Subjects – Thirty LIS blogs were examined, each of which was written by a librarian or an information scientist.Methods – The researcher reviewed 100 blogs that were found by browsing the Top 25 Librarian Bloggers as published by the Online Education Database in 2007 and by searching Technorati, one of the main search engines for blogs, using the term “library and information science.” Thirty blogs were chosen for analysis based on two criteria: the blog had to be written by a librarian or an information scientist, and the blog had to be active during the period studied (May‐July, 2008.A content analysis was undertaken on the tags assigned to the 30 blogs by categorizing the tags that appeared as tag clouds (visual representations of user‐generated tags in which the tags used more frequently are depicted in larger, bolder font in Technorati. In order to validate the Technorati tags, the researcher’s coders read and analyzed all the blog posts over the given time period. The categorization consists of five major categories, each with several subcategories. The categories were developed using a clustering approach, with new categories coming into being when a tag did not fit into an already established category.Main Results – The tag categorization resulted in five broad categories, each with several sub‐categories (a few of which are listed here:1.General (Nouns, Disciplines, Place Names2.Library‐related (Web 2.0, Librarians’ Activities, Catalogues3.Technology‐related Products, Technology – Types, People4

  17. 24 February 2012 - Polish Vice-Rectors AGH University of Science and Technology Cracow visiting the ATLAS underground experimental area with Former Collaboration Spokesperson P. Jenni; Vice Rector J. Lis signs a collaboration agreement with A. Unnervik; Adviser T. Kurtyka and A. Siemko accompany the delegation throughout.

    CERN Multimedia

    Jean-Claude Gadmer

    2012-01-01

    24 February 2012 - Polish Vice-Rectors AGH University of Science and Technology Cracow visiting the ATLAS underground experimental area with Former Collaboration Spokesperson P. Jenni; Vice Rector J. Lis signs a collaboration agreement with A. Unnervik; Adviser T. Kurtyka and A. Siemko accompany the delegation throughout.

  18. Noteiktais integrālis un tā lietojumi Vidusskolas matemātikas skolotāju studiju programmas matemātiskās analīzes kursā

    OpenAIRE

    Isaka, Kristīne

    2013-01-01

    Bakalaura darbs „Noteiktais integrālis un tā lietojumi Vidusskolas matemātikas skolotāju studiju programmas matemātiskās analīzes kursā” ir izstrādāts kā mācību palīgmateriāls studentiem. 1. nodaļā ir veikts teorētiskais apraksts par noteikto integrāli. 12 piemēros parādītas noteikto integrāļu aprēķināšanas metodes. 2. nodaļā ir apkopots 31 uzdevums par noteiktā integrāļa lietojumiem. Pielikumā ir izstrādāti individuālie mājasdarbi 15 variantos un 4 variantos ieteicamie uzdevumi kontroldarbam...

  19. 輔仁大學圖書資訊學系 能力檢測問卷之開發 Development of a Competency Questionnaire for LIS Undergraduates at Fu-Jen Catholic University

    Directory of Open Access Journals (Sweden)

    Lih-Juan ChanLin

    2009-09-01

    Full Text Available 圖書資訊學的職場亟需畢業的學生具備科技的能力以因應職場實務之表現。面臨未來學生專業之需求,圖書資訊教育必須隨時調整專業課程,以因應職場需求之變化。在專業訓練上,畢業的學生必須有優秀的表現,以跟上科技的趨勢。為了因應圖書資訊之專業需求,輔仁大學圖書資訊學系歷年來已由傳統以圖書為主的科學而轉變成為與資訊科技並重的學系。2008年為配合輔仁大學卓越計畫各學系能力指標之訂定,系所教師共同研討,訂定31項能力指標。為了測試這31項能力指標的信度與適用性,這31項能力指標的內涵轉為問卷的形式,而由學生填寫,以反映學生自我評量的能力水準。依據216位大學部生所填寫的資料進行因素分析的結果,本研究萃取五個主要因素,依序為:圖書資訊服務、媒體素養、網路素養、電腦素養,以及系統開發能。以高、低年級進行t檢定結果,高年級學生對於大部分的自評能力檢測項目之反應皆高於低年級學生 (p < 0.05。The LIS workplace demands that graduates can function optimally and keep up with technological developments. To prepare students for Library and Information Science (LIS practice, educators are challenged by the need to adapt their curricula to changes taking place in the practice of library and information science. Coping with the changing needs of LIS profession- als, the Department of Library and Information Science at Fu-Jen Catholic University has shifted from a focus of traditional library science toward a balance with information technology. In 2008, 31 competencies for under- graduate level were set up by faculty members as a partial requirement for “Teaching Excellence Project”. These competencies were translated into a questionnaire format for assessing students’perception about their capabili- ties. To test its reliability and the appropriateness of

  20. Petrologia, geoquímica e geocronologia de granulitos no sector São Fidélis-Santo António de Pádua, RJ, SE Brasil

    OpenAIRE

    Bento dos Santos, Telmo; Munhá, José; Colombo C. G Tassinari; Neto, Coriolano Dias; Fonseca, Paulo E.

    2006-01-01

    O sector São Fidélis - Santo António de Pádua situa-se na zona centro-norte da Faixa Ribeira, SE do Brasil. Esta faixa móvel, formada aquando da Orogenia Brasiliana-Panafricana como resultado da colisão entre os crátons de São Francisco e Congo Ocidental, atingiu condições de pico metamórfico granulítico (T = 800 - 900ºC e P = 8 - 9 kbar) há cerca de 575 Ma. Estas condições foram suficientes para fundir incongruentemente biotite e anfíbola, levando à formação de resíduos charnoquí...

  1. Evapotranspiração do capim Tanzânia obtida pelo método de razão de Bowen e lisímetro de pesagem

    OpenAIRE

    2005-01-01

    A irrigação de pastagens no Brasil apresentou crescimento acentuado nos últimos anos. No entanto, em função da ausência de pesquisas sobre a aplicação de água em pastagens, o manejo da irrigação não vem sendo realizado de maneira racional. Com o objetivo de contribuir para suprir a carência de informações, neste trabalho, comparou-se a evapotranspiração do capim Tanzânia estimada pelo método de razão de Bowen com a medida por lisímetro de pesagem. O experimento foi conduzido em Piracicaba - S...

  2. Conservação pós-colheita de fisális e desempenho produtivo em condições edafoclimáticas de Minas Gerais

    Directory of Open Access Journals (Sweden)

    Daniel Fernandes da Silva

    2013-12-01

    Full Text Available O Physalis sp., popularmente conhecido como fisális, é um gênero com mais de 100 espécies, pertencente à família Solanaceae, caracterizado pelo cálice concrescido, que envolve e protege o fruto contra herbívoros e intempéries. Os frutos, de sabor agridoce, são muito utilizados na culinária, podendo também ser processados em geleias, doces e licores, consumidos in natura, por seu alto teor de vitamina C e antioxidantes, além de apresentarem inúmeras propriedades medicinais. Este trabalho objetivou analisar a produtividade de fisális na região sul do Estado de Minas Gerais e observar aspectos de sua conservação pós-colheita. Os experimentos relacionados com a produtividade foram instalados na Fazenda Experimental da EPAMIG, em Maria da Fé, MG, e os demais experimentos, relacionados com a conservação pós-colheita, instalados no Laboratório de Tecnologia de Alimentos da UNIOESTE. Para avaliação da produtividade, instalou-se experimento contendo três blocos, com quatro plantas, e, para avaliação pós-colheita, foram utilizadas três repetições de cinco frutos, armazenados em câmara controlada tipo B.O.D, sem atmosfera modificada, por 28 dias, à temperatura de 5ºC, e avaliados no momento da instalação, aos 7, 14, 21 e 28 dias. Foram avaliados diâmetros longitudinal e transversal (mm, peso médio do fruto (g, com e sem cálice, peso total da colheita (g e teor de sólidos solúveis totais. Em laboratório, avaliaram-se perda de peso, acidez (ATT, pH, sólidos solúveis totais (SST e teor de vitamina C. Os frutos cultivados em Minas Gerais apresentaram características semelhantes às de frutos produzidos em regiões tradicionais de cultivo e podem facilmente ser armazenados por um período de 28 dias.

  3. Operational and LIS-Based North American Land Data Assimilation Systems at National Centers for Environmental Prediction: Capability in Simulating Water and Energy Budget over the Western United States

    Science.gov (United States)

    Mitchell, K.; Xia, Y.; Ek, M. B.; Mocko, D. M.; Kumar, S.; Peters-Lidard, C. D.

    2016-12-01

    NLDAS is a multi-institutional collaborative project sponsored by NOAA's Climate Program Office and NASA's Terrestrial Hydrological Program. NLDAS has a long successful history of producing soil moisture, snow cover, total runoff and streamflow products via application of surface meteorology and precipitation datasets to drive four land-surface models (i.e., Noah, Mosaic, SAC, VIC). The purpose of the NLDAS system is to support numerous research and operational applications in the land modeling and water resources management communities. Since the operational NLDAS version was successfully implemented at NCEP in August 2014, NLDAS products are being used by over 5000 users annually worldwide, including academia, governmental agencies, and private enterprises. Over 71 million files and 144 Tb of data were downloaded in 2015. As we endeavor to increase the quality and breadth of NLDAS products, a joint effort between NASA and NCEP is underway to enable the assimilation of hydrology-relevant remote sensing datasets within NLDAS through the NASA Land Information System (LIS). The use of LIS will also enable easier transition of newly upgraded land surface models into NCEP NLDAS operations. Cold season processes significantly affect water and energy cycles, and their partitioning. As such, in the evaluation of NLDAS systems it is important to assess water and energy exchanges and/or partitioning processes over high-elevations. The Rocky Mountain region of the western U. S. is chosen as such a region to analyze and compare snow water equivalent (SWE), snow cover, snow melt, snow sublimation, total runoff, and sensible heat and latent heat flux. Reference data sets (observation-based and reanalysis) of monthly SWE, streamflow, evapotranspiration, GRACE-based total water storage change, and energy fluxes are used to evaluate model-simulated results. The results show several key factors that affect model simulations: (1) forcing errors such as precipitation partitioning

  4. IMPACT OF ATRIAL FIBRILLATION ON THE NEAR AND LONG-TERM PROGNOSIS OF LIFE AFTER ACUTE MYOCARDIAL INFARCTION. THE DATA OF THE LIS-1 STUDY (LYUBERTSY MORTALITY STUDY OF PATIENTS WITH ACUTE MYOCARDIAL INFARCTION

    Directory of Open Access Journals (Sweden)

    S. Yu. Martsevich

    2014-01-01

    Full Text Available Aim. To study the effect of atrial fibrillation (AF that existed before the myocardial infarction (MI, on near and long-term mortality in patients with acute MI.Material and methods. The data of LIS register (Lyubertsy study on mortality rate in patients after MI, that included all patients hospitalized for acute MI (n=1133 during the period from 1 January 2005 to 31 December 2007, were used to solve the aim of the study.Results. AF was recorded in 88 patients (7.8%, and the frequency of AF significantly increased with age. 22 patients with a history of AF (25% died in hospital, and mortality in this group of patients was significantly higher than this in the whole group of patients (15.2%; p=0.025. However, these differences were not statistically significant when adjusted for age and gender (OR=1.25; 95% CI 0.77-2.04; p=0.37. 66 people from 961 patients, who were discharged from the hospital, had the AF before acute MI. Relative risk of death in patients with AF in this group (adjusted for age and sex was significantly higher than this in patients without AF (OR=1.91; 95% CI 1.18-3.11; p=0.005. Conclusion. AF diagnosed in patients with acute MI at admission did not influence significantly hospital mortality. However, pre-existing AF increases significantly the risk of death in patients survived acute period of MI.

  5. IMPACT OF ATRIAL FIBRILLATION ON THE NEAR AND LONG-TERM PROGNOSIS OF LIFE AFTER ACUTE MYOCARDIAL INFARCTION. THE DATA OF THE LIS-1 STUDY (LYUBERTSY MORTALITY STUDY OF PATIENTS WITH ACUTE MYOCARDIAL INFARCTION

    Directory of Open Access Journals (Sweden)

    S. Yu. Martsevich

    2015-09-01

    Full Text Available Aim. To study the effect of atrial fibrillation (AF that existed before the myocardial infarction (MI, on near and long-term mortality in patients with acute MI.Material and methods. The data of LIS register (Lyubertsy study on mortality rate in patients after MI, that included all patients hospitalized for acute MI (n=1133 during the period from 1 January 2005 to 31 December 2007, were used to solve the aim of the study.Results. AF was recorded in 88 patients (7.8%, and the frequency of AF significantly increased with age. 22 patients with a history of AF (25% died in hospital, and mortality in this group of patients was significantly higher than this in the whole group of patients (15.2%; p=0.025. However, these differences were not statistically significant when adjusted for age and gender (OR=1.25; 95% CI 0.77-2.04; p=0.37. 66 people from 961 patients, who were discharged from the hospital, had the AF before acute MI. Relative risk of death in patients with AF in this group (adjusted for age and sex was significantly higher than this in patients without AF (OR=1.91; 95% CI 1.18-3.11; p=0.005. Conclusion. AF diagnosed in patients with acute MI at admission did not influence significantly hospital mortality. However, pre-existing AF increases significantly the risk of death in patients survived acute period of MI.

  6. Nuevas perspectivas de la Lis Pendens en la litigación internacional: el caso de la reestructuración del código de proceso civil brasileño

    Directory of Open Access Journals (Sweden)

    Tatiana de A F R Cardoso Squeff

    2016-05-01

    Full Text Available El presente trabajo tiene como objetivo principal el estudio del Nuevo Código de Proceso Civil Brasileño sobre litispendencia internacional como forma de garantizar la estabilidad de las relaciones interpersonales que no se quedan firmes por el modelo actual. Por eso, el estudio empieza por el análisis del principio de la seguridad jurídica demostrando su importancia para el Derecho y su realización social. Posteriormente, señala sobre la competencia internacional de los tribunales brasileños, exhibiendo las formas exclusivas y concurrentes existentes, para llegarse a la lis pendens de acciones propuestas en distintos Estados. A continuación, trabaja específicamente con la cuestión de litispendencia, justamente por la posibilidad de las acciones aforadas en jurisdicciones de dos o más países inducir pendencia, señalizando la necesidad de reestructuración del Código de Proceso actualmente vigente para una mayor seguridad jurídica. Por lo tanto, al final, analiza la alteración sugerida por el legislador para determinar si la sugerencia garantiza las relaciones sociales o no.

  7. THE LIS STUDY (LYUBERTSY STUDY OF MORTALITY IN PATIENTS WITH ACUTE MYOCARDIAL INFARCTION. EVALUATION OF THE PHARMACOTHERAPY. PART 1. TREATMENT OF PATIENTS BEFORE MYOCARDIAL INFARCTION AND ITS INFLUENCE ON HOSPITAL MORTALITY RATE

    Directory of Open Access Journals (Sweden)

    S. Y. Marcevich

    2015-12-01

    Full Text Available Aim. To assess the patients’ pharmacotherapy preceding the acute myocardial infarction (AMI and to assess the effects of this therapy on hospital mortality. Material and methods. 1133 patients were enrolled into the LIS AMI register . All these patients experienced AMI leading to hospital admitting in the territory of one of the districts of the Moscow Region during 3 years. The pharmacotherapy that patients received before AMI was analyzed as well as the influence of different drugs on the hospital mortality risk. Results. 172 of 1133 patients (15.2% died in hospital. Before admission 21.4% of patients received β-blockers, 35.3% — ACE inhibitors, 15.7% — antiplatelet drugs, 1.9% — statins. Reduction in the hospital mortality rate was shown for β-blockers [relative risk (RR=0.542, confidence interval (CI =0.357–0.824] and ACE inhibitors (RR=0.710, CI=0.512–0.986. Conclusion. A significant part of patients with high risk of AMI does not receive drugs with proven positive effect on the life prognosis.

  8. THE LIS STUDY (LYUBERTSY STUDY OF MORTALITY IN PATIENTS WITH ACUTE MYOCARDIAL INFARCTION. EVALUATION OF THE PHARMACOTHERAPY. PART 1. TREATMENT OF PATIENTS BEFORE MYOCARDIAL INFARCTION AND ITS INFLUENCE ON HOSPITAL MORTALITY RATE

    Directory of Open Access Journals (Sweden)

    S. Y. Marcevich

    2012-01-01

    Full Text Available Aim. To assess the patients’ pharmacotherapy preceding the acute myocardial infarction (AMI and to assess the effects of this therapy on hospital mortality. Material and methods. 1133 patients were enrolled into the LIS AMI register . All these patients experienced AMI leading to hospital admitting in the territory of one of the districts of the Moscow Region during 3 years. The pharmacotherapy that patients received before AMI was analyzed as well as the influence of different drugs on the hospital mortality risk. Results. 172 of 1133 patients (15.2% died in hospital. Before admission 21.4% of patients received β-blockers, 35.3% — ACE inhibitors, 15.7% — antiplatelet drugs, 1.9% — statins. Reduction in the hospital mortality rate was shown for β-blockers [relative risk (RR=0.542, confidence interval (CI =0.357–0.824] and ACE inhibitors (RR=0.710, CI=0.512–0.986. Conclusion. A significant part of patients with high risk of AMI does not receive drugs with proven positive effect on the life prognosis.

  9. 由CoLIS看圖書館學與資訊科學研究之發展 | Explore from CoLIS:The Development of Library and Information Science

    Directory of Open Access Journals (Sweden)

    楊曉雯 Hsiao-Wen Yang

    2000-04-01

    Full Text Available

    頁次:61-78

    面對日益複雜的資訊系統發展與對資訊需求、利用的挑戰,其刺激我們反思的是,在資訊研究的專業積域中,是否具有足夠的理論與研究成果,以及適切的研究方向,足以迎接這些時代的新挑戰?

    CoLIS1991年首次召開,其是自70

  10. Dynamic Logics of Dynamical Systems

    CERN Document Server

    Platzer, André

    2012-01-01

    We survey dynamic logics for specifying and verifying properties of dynamical systems, including hybrid systems, distributed hybrid systems, and stochastic hybrid systems. A dynamic logic is a first-order modal logic with a pair of parametrized modal operators for each dynamical system to express necessary or possible properties of their transition behavior. Due to their full basis of first-order modal logic operators, dynamic logics can express a rich variety of system properties, including safety, controllability, reactivity, liveness, and quantified parametrized properties, even about relations between multiple dynamical systems. In this survey, we focus on some of the representatives of the family of differential dynamic logics, which share the ability to express properties of dynamical systems having continuous dynamics described by various forms of differential equations. We explain the dynamical system models, dynamic logics of dynamical systems, their semantics, their axiomatizations, and proof calcul...

  11. Ethnographic Methods are Becoming More Popular in LIS Research. A Review of: Khoo, M., Rozaklis, L., & Hall, C. (2012. A survey of the use of ethnographic methods in the study of libraries and library users. Library & Information Science Research, 34(2, 82-91. doi:10.1016/j.lisr.2011.07.010

    Directory of Open Access Journals (Sweden)

    Diana K. Wakimoto

    2013-03-01

    Full Text Available Objective – To determine the number of ethnographic studies of libraries and library users, where these studies are published, how researchers define ethnography, and which methods are used by the researchers.Design – Literature survey.Setting – The researchers are located at Drexel University, Philadelphia, Pennsylvania, United States of America.Subjects – 81 ethnographic studies of libraries and library users.Methods – The researchers conducted a literature survey, starting with a pilot study of selected library and information science (LISjournals, to find ethnographic studies and to determine key terms in research using ethnographic methods. The researchers used these terms in the main study to identify more LIS research using ethnographic methods. The same journals used in the pilot study were then searched online as part of the main study, along with three LIS databases (LISA, LISTA,LLIS. The researchers also searched the open web in order to capture grey literature in the LIS field. All literature found, including those sources found through secondary citations, was screened for inclusion in coding. Studies with non-LIS settings were excluded as were studies that utilized non-ethnographic methods. The screened studies were coded to determine categories of methods used. Main Results – The researchers found 81 articles, reports, and conference presentations that used ethnographic methods, which they compiled into a bibliography. This is an order of magnitude larger than that found by previous literature surveys. Of these studies, 51.9% were published after 2005. The majority (64.2% of the studies were published in journals. Many studies did not provide clear or detailed definitions of ethnography and the definitions that were provided varied widely. The researchers identified themes which had been used to support ethnographic methods as a research methodology. These included using ethnographic methods to gain richer insight into

  12. Šroubový lis 50t

    OpenAIRE

    Švábenský, Pavel

    2014-01-01

    Diplomová práce je zaměřena na návrh konstrukčního řešení lisu, který slouží pro laboratorní zkoušky materiálu metodou ECAP. V práci je obsažen návrh jednotlivých konstrukčních skupin a jejich popis, včetně tvorby 3D modelu. Diploma thesis is focused on desing of the screw press, which is used for laboratory testing of materials by ECAP. Thesis included design of individual scructural groups and their destcription, including the creating of 3D model. D

  13. Allelopathic effects of Eucalyptus citriodora on amaryllis and associated grassy weed Efeitos alelopáticos do Eucalyptus citriodora sobre amarílis e em gramíneas daninhas associadas

    Directory of Open Access Journals (Sweden)

    K.G El-Rokiek

    2009-12-01

    secas de Eucalyptus citriodora na germinação e no crescimento inicial de aveia-selvagem (Avena fatua. A germinação da semente, a raiz e o comprimento da brotação apresentaram diferentes graus de inibição, de acordo com a concentração do extrato aquoso. As maiores porcentagens de inibição da germinação, de raiz e de comprimento de brotação foram registradas com extrato fresco das folhas a 25%. Com base no trabalho preliminar (experimento em placa de Petri, foram conduzidos estudos na estufa do Centro de Pesquisa Nacional, Egito, em duas estações de inverno: 2006/2007 e 2007/2008. Nesse local, foram avaliados os efeitos de tratamentos foliar e do solo de extratos aquosos das folhas frescas e secas de Eucalyptus citriodora na aveia-selvagem, assim como no crescimento e no florescimento da espécie Hippeastrum hybridum, em comparação com a dose recomendada do herbicida tralkoxydim. Os pesos frescos e secos do amarílis sofreram aumento significativo, bem como o florescimento, quando tratados com os extratos, principalmente com a pulverização do extrato das folhas frescas. Entretanto, os pesos frescos e secos da aveia-selvagem foram reduzidos significativamente pelos extratos aquosos, tanto frescos como secos, indicando intoxicação. O herbicida tralkoxydim causou a inibição completa de aveia-selvagem em comparação ao controle. Os estudos envolveram a avaliação dos índices endógenos de fenóis totais na espécie daninha. Em todos os tratamentos, os efeitos inibitórios nas espécies daninhas foram correlacionados com o acúmulo de índices internos dos fenóis totais, comparados aos respectivos controles. Constatou-se boa correlação entre a quantidade de fenóis e o desempenho do crescimento na espécie daninha. Este estudo estabeleceu o efeito dos extratos aquosos sobre a espécie daninha aveia-selvagem associada ao amarílis, o que pode servir como ferramenta para estabelecer seu potencial herbicida.

  14. Dynamical Languages

    Science.gov (United States)

    Xie, Huimin

    The following sections are included: * Definition of Dynamical Languages * Distinct Excluded Blocks * Definition and Properties * L and L″ in Chomsky Hierarchy * A Natural Equivalence Relation * Symbolic Flows * Symbolic Flows and Dynamical Languages * Subshifts of Finite Type * Sofic Systems * Graphs and Dynamical Languages * Graphs and Shannon-Graphs * Transitive Languages * Topological Entropy

  15. Library School Curricula in the US Should Address Liaison Responsibilities for Students Interested in Academic Librarianship, A Review of: Attebury, R. I., & Finnell, J. (2009. What do LIS students in the United States know about liaison duties? New Library World, 110(7, 325‐340.

    Directory of Open Access Journals (Sweden)

    Nazi Torabi

    2010-06-01

    Full Text Available Objectives – The two main objectives of this study were to determine the level of prevalence of liaison work in academic library job advertisements and to investigate whether the current library & information science (LIS students are aware of liaison duties.Design – The mixed methods used in this study are job postings analysis and online survey.Setting – The research settings were the following:(1Online academic job advertisements published between November 15, 2007 and January 15, 2008 and collected from Chronicle of Higher Education’s Web site and lisjobs.com;(2Fifty‐three electronic mail lists of ALA‐accredited library schools in the US.Subjects – The subjects of the study were 313 online academic job advertisements and 516 LIS students.Methods – The sample size and methodology for the first part of this study were based on four previously published studies. Duplicated job postings were removed and the remaining were organized into 15 categories of access/public services, reference, instruction, bibliographer/subject specialist, combination (instruction and reference, archives/special collections, special libraries, director/dean, department head or coordinator, interlibrary loan (ILL, systems/web development, cataloguing, outreach, and acquisitions/collection‐development. Only those job ads containing the term “liaison” were included in the analysis.For the second part of the study, the authors conducted an online survey. They attempted to investigate the knowledge of LIS students on liaison librarianship, to measure the level of exposure to liaison responsibilities in their course work, and to gauge the confidence of the individual in their ability to become successful liaison librarians. The survey was distributed among 53 LIS school electronic mail lists, resulting in 516 respondents.Main Results – The job ad analysis revealed that 29% of job postings were directly related to liaison duties. The liaison component

  16. In vivo biostability of polymeric spine implants: retrieval analyses from a United States investigational device exemption study

    OpenAIRE

    Shen, Ming; Zhang, Kai; Koettig, Petra; Welch, William C.; Dawson, John M.

    2011-01-01

    The Dynesys System for stabilizing the lumbar spine was first surgically implanted in Europe in 1994. In 2003, a prospective, randomized, investigational device exemption clinical trial of the system for non-fusion dynamic stabilization began. Polycarbonate urethane (PCU) and polyethylene terephthalate (PET) components explanted from four patients who had participated in the study were analyzed for biostability. Components had been implanted 9–19 months. The explanted components were visually...

  17. Types of cutting and use of IBA in the vegetative propagation of Physalis = Tipos de estacas e uso de AIB na propagação vegetativa de fisális

    Directory of Open Access Journals (Sweden)

    João Antonio Ramos de Oliveira

    2015-10-01

    , massa seca de folhas e massa seca total. Aos 20 DAP não foram encontradas diferenças significativas para nenhuma das variáveis analisadas, sendo que aos 40 DAP verificou-se efeito significativo para concentração de AIB para número de folhas. Aos 60 DAP verificou-se que é dispensável o uso de AIB, em virtude da pouca eficiência do regulador nas variáveis avaliadas. Recomenda-se a produção de mudas de fisális por estaquia sem utilização do AIB.

  18. Integral Study of Atrazine Behaviour in Field Lysimeters in Argentinean Humid Pampas Soils Estudio Integral del Comportamiento de Atrazina en Lisímetros de Campo en Suelos de la Pampa Húmeda Argentina

    Directory of Open Access Journals (Sweden)

    Susana Hang

    2010-03-01

    Full Text Available Atrazine behavior during crop maize (Zea mays L. production in soils of Argentine humid pampas was investigated. Lysimeters (3.3 x 3.3 x 1.4 m with a Typic Argiudoll (Pergamino and others with a Typic Hapludoll (Junín were monitored for drainage water content and atrazine concentrations in soil and water. Soil profiles were sampled in four depths in three dates, and water drainage pooled in four periods. Most of atrazine loss in drainage occurred within 30 d of atrazine application being 0.13% and 0.03% of the total atrazine applied for Pergamino and Junín, respectively. Under laboratory conditions half-life average in both profiles was 16 d. Atrazine extractable residues (AER in lysimeters showed differences in quantity and distribution between both profiles. Extractable residues were 25.7 (Pergamino and 69.4 g ha-1 (Junín. At the 30th day of application, AER represented 25% of total AER in Junín and 88% in Pergamino in the first 30 cm. Occurrence of preferential flow through the Bt horizon (Pergamino may explain differences detected. High proportion of AER in Junín profile suggests low atrazine affinity and should be followed through time in order to evaluate actual stability of these residues and if they constitute a potential risk for aquifers.Se estudió el comportamiento de atrazina durante el ciclo de un cultivo de maíz (Zea mays L. en suelos de la pampa húmeda Argentina. Se monitoreó el total de agua drenada y la concentración de atrazina en suelo y agua, mediante el uso de seis lisímetros (3.3 x 3.3 x 1.4 m tres de ellos llenados con un Argiudoll Típico (Pergamino y otros tres con un Hapludoll Típico (Junín. Se tomaron muestras de cuatro horizontes en cada perfil de suelo en tres fechas y el agua drenada se agrupó en cuatro períodos. La mayor parte de las pérdidas de atrazina en el drenaje ocurrieron dentro de los primeros 30 días desde la aplicación de atrazina. Los porcentajes recuperados respecto de la cantidad

  19. Early Deglacial Laurentide Ice Sheet Meltwater Dynamics Explored from the Northern Gulf of Mexico

    Science.gov (United States)

    Brown, E. A.; Flower, B. P.; Williams, C.; Goddard, E.

    2011-12-01

    Understanding initial Laurentide Ice Sheet (LIS) retreat at the end of the Last Glacial Maximum (LGM) is vital to understanding its role in the global dynamics of the deglacial period. Of particular interest is the timing of initial LIS retreat compared to that of the other large high-latitude ice sheets and smaller mid-latitude mountain glaciers. High-latitude deglacial warming appears to have been asynchronous (Antarctica 17-19 ka, Greenland ~14.7 ka), while smaller mountain glaciers between ~45°N and ~45°S began a synchronous retreat closer to the warming trend in Antarctica. Core MD02-2550 from the anoxic Orca Basin offers excellent carbonate preservation and a continuous sediment accumulation rate of >35 cm/kyr. Forty-seven accelerator mass spectrometry 14C dates provide very good age control in a record spanning 10.73 - 23.86 ka. We present paired Mg/Ca and δ18O data from the planktonic foraminifera Globigerinoides ruber (pink variety) as proxies for sea surface temperature (SST) and the δ18O composition of seawater (δ18Osw), respectively. Mg/Ca-derived SST from the inferred summer-dominant G. ruber (pink) exhibits a mean value of 23.4 ± 0.8°C throughout the LGM (23.88 to 18.4 ka), almost 4° below the modern summer mean. This SST is lower than originally found by the CLIMAP project, based on faunal assemblages. Preliminary Blackman-Tukey spectral analysis on SST appears to show significant peaks at roughly 820-, 715-, and 470-year periods. From 18.4 - 17.8 ka, SST exhibits a sharp cold snap of almost 2°C (mean 21.8°C). This anomalous cold snap persisted until 17.8 ka, when a sustained recovery toward present day conditions began. Gulf of Mexico SST warming occurs markedly early relative to the onset of the Bølling-Allerød warm period recorded in Greenland ice core records (~14.67 ka). A corresponding record of G. ruber (white variety) allows a parallel evaluation not biased toward the summer season. To explain this cold snap, we explore the

  20. Molecular dynamics

    Energy Technology Data Exchange (ETDEWEB)

    Ladd, A.J.C.

    1988-08-01

    The basic methodology of equilibrium molecular dynamics is described. Examples from the literature are used to illustrate how molecular dynamics has been used to resolve theoretical controversies, provide data to test theories, and occasionally to discover new phenomena. The emphasis is on the application of molecular dynamics to an understanding of the microscopic physics underlying the transport properties of simple fluids. 98 refs., 4 figs.

  1. Dynamics Laboratory

    Data.gov (United States)

    Federal Laboratory Consortium — The Dynamics Lab replicates vibration environments for every Navy platform. Testing performed includes: Flight Clearance, Component Improvement, Qualification, Life...

  2. Dynamical systems

    CERN Document Server

    Sternberg, Shlomo

    2010-01-01

    Celebrated mathematician Shlomo Sternberg, a pioneer in the field of dynamical systems, created this modern one-semester introduction to the subject for his classes at Harvard University. Its wide-ranging treatment covers one-dimensional dynamics, differential equations, random walks, iterated function systems, symbolic dynamics, and Markov chains. Supplementary materials offer a variety of online components, including PowerPoint lecture slides for professors and MATLAB exercises.""Even though there are many dynamical systems books on the market, this book is bound to become a classic. The the

  3. 学科知识网络研究(Ⅰ)引文网络的结构、特征与演化1)%Scientific Knowledge Networks in LIS (Ⅰ):Case Study on the Structure, Characteristics and Evolution of Citation Networks

    Institute of Scientific and Technical Information of China (English)

    2014-01-01

    科学引文网络是学科知识网络的重要组成部分,为分析近110多年来图书馆与情报学领域内的引文网络并梳理其知识链,本文利用SSCI数据库全面收集了该领域内85种国际权威期刊的71350篇文献数据,研究了这些论文的被引频次随时间的变化情况,利用Citespace软件绘制百年来的科学引文网络并对中心度较高的关键性节点进行了分析。结果显示图书馆与情报学有影响力的节点文献主要集中出现于20世纪60年代至今,该学科的知识基础在此期间也得以构建起来。另外图书馆与情报学领域引文网络的入度具有无标度特征,文献的出度分布在半对数坐标中具有线性关系,图书馆与情报学领域内文献的被引和参考之比较低,高引论文的出度对入度的影响比较有限。%In this paper, a totally 71,350 papers of Library and Information Science (LIS) data within 85 kinds of their journals was comprehensively collected from the SSCI database to get the citation networks in nearly 110 years, and to analyze the knowledge chain. After learning the citation account over time, the Citespace software was employed to show the scientific citation networks in the past century and the critical nodes with higher degree were thoroughly analyzed. The research results show all the influential literature nodes within the LIS citation networks mainly distributed in the 1960s up to now, during this period the disciplines infrastructure was built. And another viewpoint in this paper is the indegree distribution in the field of LIS is of scalefree, the outdegree is of semilogarithmic linear relationship. The reference cited to citation kept relatively low ratio, the outdegree to indegree for high influential papers was limited.

  4. Molecular dynamics

    NARCIS (Netherlands)

    Bergstra, J.A.; Bethke, I.

    2002-01-01

    Molecular dynamics is a model for the structure and meaning of object based programming systems. In molecular dynamics the memory state of a system is modeled as a fluid consisting of a collection of molecules. Each molecule is a collection of atoms with bindings between them. A computation is model

  5. Dynamic Squares

    NARCIS (Netherlands)

    Blackburn, P.; Venema, Y.

    2008-01-01

    This paper examines various propositional logics in which the dynamic implication connective (discussed in Groenendijk and Stokhof's (1992) Dynamic Predicate Logic and Kamp's (1981) Discourse Representation Theory) plays the central role. Our approach is modal: the basic idea is to view as a binary

  6. Record dynamics

    DEFF Research Database (Denmark)

    Robe, Dominic M.; Boettcher, Stefan; Sibani, Paolo

    2016-01-01

    When quenched rapidly beyond their glass transition, colloidal suspensions fall out of equilibrium. The pace of their dynamics then slows down with the system age, i.e., with the time elapsed after the quench. This breaking of time translational invariance is associated with dynamical observables...

  7. Fluid Dynamics

    DEFF Research Database (Denmark)

    Brorsen, Michael

    These lecture notes are intended mainly for the 7th semester course "Fluid Dynamics" offered by the Study Committee on Civil Engineering, Aalborg University.......These lecture notes are intended mainly for the 7th semester course "Fluid Dynamics" offered by the Study Committee on Civil Engineering, Aalborg University....

  8. Persuasion dynamics

    Science.gov (United States)

    Weisbuch, Gérard; Deffuant, Guillaume; Amblard, Frédéric

    2005-08-01

    We here discuss a model of continuous opinion dynamics in which agents adjust continuous opinions as a result of random binary encounters whenever their difference in opinion is below a given threshold. We concentrate on the version of the model in the presence of few extremists which might drive the dynamics to generalized extremism. A network version of the dynamics is presented here, and its results are compared to those previously obtained for the full-mixing case. The same dynamical regimes are observed, but in rather different parameter regions. We here show that the combination of meso-scale features resulting from the first interaction steps determines the asymptotic state of the dynamics.

  9. Dynamic Optimization

    Science.gov (United States)

    Laird, Philip

    1992-01-01

    We distinguish static and dynamic optimization of programs: whereas static optimization modifies a program before runtime and is based only on its syntactical structure, dynamic optimization is based on the statistical properties of the input source and examples of program execution. Explanation-based generalization is a commonly used dynamic optimization method, but its effectiveness as a speedup-learning method is limited, in part because it fails to separate the learning process from the program transformation process. This paper describes a dynamic optimization technique called a learn-optimize cycle that first uses a learning element to uncover predictable patterns in the program execution and then uses an optimization algorithm to map these patterns into beneficial transformations. The technique has been used successfully for dynamic optimization of pure Prolog.

  10. Tracking Theory Building and Use Trends in Selected LIS Journals: More Research is Needed. A review of: Kim, Sung‐Jin, and Dong Y. Jeong. “An Analysis of the Development and Use of Theory in Library and Information Science Research Articles.” Library & Information Science Research 28.4 (Sept. 2006: 548‐62.

    Directory of Open Access Journals (Sweden)

    Carol Perryman

    2007-09-01

    Full Text Available Objective ‐ The authors measure theory incidents occurring in four LIS journals between 1984‐2003 in order to examine their number and quality and to analyze them by topic. A third objective, only identified later in the text of the study, was to compare theory development and use between Korean and international journals. Research questions asked include whether LIS has its own theoretical base as a discipline, and what characteristics the theoretical framework has.Design – Bibliometric study.Setting – Journal issues selected from four LIS journals for the time span from 1984 ‐ 2003.Subjects – Two international journals, Journal of the American Society for Information Science and Technology (JASIST and Library and Information Science Research (LISR were selected based on their high ranking in the Social Sciences Citation Index (SSCI impact factors. Two Korean journals, Journal of the Korean Society for Information Management (JKSIM and Journal of the Korean Society for Library and Information Science (JKSLIS were selected.Methods ‐ After having determined a definition of theory, and identifying different levels of theory, the authors set up rules for the identification of theory incidents, which are defined as “events in which the author contributed to the development or the use of theory in his/her own paper” (550. Content analysis of 1661 research articles was performed to measure theory incidents according to working definitions. Interrater reliability was ensured by conducting independent coding for “subfield classification, identification of theory incidents, and quality measurement” (555,using a sample of 199 articles (random selection not specified, achieving 94‐97% interrater reliability. Incidents, once identified, were evaluated for quality using Dubin’s “efficiency of law” criteria, involving measures of relatedness, directionality, co‐variation, rate of change, and “profundity,” defined as the

  11. Dynamic triggering

    Science.gov (United States)

    Hill, David P.; Prejean, Stephanie; Schubert, Gerald

    2015-01-01

    Dynamic stresses propagating as seismic waves from large earthquakes trigger a spectrum of responses at global distances. In addition to locally triggered earthquakes in a variety of tectonic environments, dynamic stresses trigger tectonic (nonvolcanic) tremor in the brittle–plastic transition zone along major plate-boundary faults, activity changes in hydrothermal and volcanic systems, and, in hydrologic domains, changes in spring discharge, water well levels, soil liquefaction, and the eruption of mud volcanoes. Surface waves with periods of 15–200 s are the most effective triggering agents; body-wave trigger is less frequent. Triggering dynamic stresses can be < 1 kPa.

  12. Galactic dynamics

    CERN Document Server

    Binney, James

    2008-01-01

    Since it was first published in 1987, Galactic Dynamics has become the most widely used advanced textbook on the structure and dynamics of galaxies and one of the most cited references in astrophysics. Now, in this extensively revised and updated edition, James Binney and Scott Tremaine describe the dramatic recent advances in this subject, making Galactic Dynamics the most authoritative introduction to galactic astrophysics available to advanced undergraduate students, graduate students, and researchers. Every part of the book has been thoroughly overhauled, and many section

  13. Dynamic capabilities

    DEFF Research Database (Denmark)

    Grünbaum, Niels Nolsøe; Stenger, Marianne

    2013-01-01

    it was dominated by a lack of systematism, assessment, monitoring, marketing speculations and feasibility calculation. Furthermore, the sphere was dictated by asymmetric supplier-customer relationships and negotiation power leading, among other possible factors, to meager profitability.......The consequences of dynamic capabilities (i.e. innovation performance and profitability) is an under researched area in the growing body of literature on dynamic capabilities and innovation management. This study aims to examine the relationship between dynamic capabilities, innovation performance...... and profitability of small and medium sized manufacturing enterprises operating in volatile environments. A multi-case study design was adopted as research strategy. The findings reveal a positive relationship between dynamic capabilities and innovation performance in the case companies, as we would expect. It was...

  14. Jumping Dynamics

    DEFF Research Database (Denmark)

    Sannino, Francesco

    2013-01-01

    We propose an alternative paradigm to the conjectured Miransky scaling potentially underlying the physics describing the transition from the conformally broken to the conformally restored phase when tuning certain parameters such as the number of flavors in gauge theories. According to the new...... paradigm the physical scale and henceforth also the massive spectrum of the theory jump at the lower boundary of the conformal window. In particular we propose that a theory can suddenly jump from a Quantum Chromodynamics type spectrum, at the lower boundary of the conformal window, to a conformal one...... without particle interpretation. The jumping scenario, therefore, does not support a near-conformal dynamics of walking type. We will also discuss the impact of jumping dynamics on the construction of models of dynamical electroweak symmetry breaking....

  15. Dynamic Bifurcations

    CERN Document Server

    1991-01-01

    Dynamical Bifurcation Theory is concerned with the phenomena that occur in one parameter families of dynamical systems (usually ordinary differential equations), when the parameter is a slowly varying function of time. During the last decade these phenomena were observed and studied by many mathematicians, both pure and applied, from eastern and western countries, using classical and nonstandard analysis. It is the purpose of this book to give an account of these developments. The first paper, by C. Lobry, is an introduction: the reader will find here an explanation of the problems and some easy examples; this paper also explains the role of each of the other paper within the volume and their relationship to one another. CONTENTS: C. Lobry: Dynamic Bifurcations.- T. Erneux, E.L. Reiss, L.J. Holden, M. Georgiou: Slow Passage through Bifurcation and Limit Points. Asymptotic Theory and Applications.- M. Canalis-Durand: Formal Expansion of van der Pol Equation Canard Solutions are Gevrey.- V. Gautheron, E. Isambe...

  16. Dynamical systems

    CERN Document Server

    Birkhoff, George D

    1927-01-01

    His research in dynamics constitutes the middle period of Birkhoff's scientific career, that of maturity and greatest power. -Yearbook of the American Philosophical Society The author's great book€¦is well known to all, and the diverse active modern developments in mathematics which have been inspired by this volume bear the most eloquent testimony to its quality and influence. -Zentralblatt MATH In 1927, G. D. Birkhoff wrote a remarkable treatise on the theory of dynamical systems that would inspire many later mathematicians to do great work. To a large extent, Birkhoff was writing about his o

  17. Forest dynamics.

    Science.gov (United States)

    Frelich, Lee

    2016-01-01

    Forest dynamics encompass changes in stand structure, species composition, and species interactions with disturbance and environment over a range of spatial and temporal scales. For convenience, spatial scale is defined as individual tree, neighborhood, stand, and landscape. Whether a given canopy-leveling disturbance will initiate a sequence of development in structure with little change in composition or initiate an episode of succession depends on a match or mismatch, respectively, with traits of the dominant tree species that allow the species to survive disturbance. When these match, certain species-disturbance type combinations lock in a pattern of stand and landscape dynamics that can persist for several generations of trees; thus, dominant tree species regulate, as well as respond to, disturbance. A complex interaction among tree species, neighborhood effects, disturbance type and severity, landform, and soils determines how stands of differing composition form and the mosaic of stands that compose the landscape. Neighborhood effects (e.g., serotinous seed rain, sprouting, shading, leaf-litter chemistry, and leaf-litter physical properties) operate at small spatial extents of the individual tree and its neighbors but play a central role in forest dynamics by contributing to patch formation at stand scales and dynamics of the entire landscape. Dominance by tree species with neutral to negative neighborhood effects leads to unstable landscape dynamics in disturbance-prone regions, wherein most stands are undergoing succession; stability can only occur under very low-severity disturbance regimes. Dominance by species with positive effects leads to stable landscape dynamics wherein only a small proportion of stands undergo succession at any one time. Positive neighborhood effects are common in temperate and boreal zones, whereas negative effects are more common in tropical climates. Landscapes with positive dynamics have alternate categories of dynamics

  18. Li-S电池硫正极性能衰减机理分析及研究现状概述%Analysis of the Sulfur Cathode Capacity Fading Mechanism and Review of the Latest Development for Li-S Battery

    Institute of Scientific and Technical Information of China (English)

    刁岩; 谢凯; 洪晓斌; 熊仕昭

    2013-01-01

    由于汽车工业的持续发展,对高能量密度二次电池的需求逐步增加,锂硫电池开始走进人们的视野.锂硫电池的理论比能量高达2600Wh/kg,而单质硫的理论比容量达1680mAh/g.同时,硫的储量丰富,廉价,并且环境友好.虽然可充电锂硫电池相比于传统锂离子电池有诸多优势,但目前其可实现的实际比容量远低于理论比容量,循环寿命也较短等弊端限制了其大规模应用.作者从Li-S电池正极的工作原理出发,对硫正极容量损失及衰减机理做了深刻的解析,并结合本实验室的工作归纳总结了导致硫正极容量衰减的主要因素.针对硫正极容量衰减因素,从碳导电结构、聚合物包覆以及纳米金属氧化物添加剂等方面,对近年来提高硫正极性能的主要研究方向及最新研究进展进行了综述,并对其中存在的问题进行分析,最后对提高Li-S电池的整体性能提出展望.%Because of automotive industry sustainable development, the demand for higher energy density rechargeable batteries make the lithium-sulfur (Li-S) batteries become one of the most attractive candidates. The Li-S systems have a theoretical specific energy of 2600 Wh/kg while the theoretical capacity of sulfur is 1680 mAh/g. Sulfur is abundant, low cost and environment friendly. Although the rechargeable Li-S batteries possess more advantages over the conventional lithium ion batteries, the practical use faces with a variety of problems such as low specific capacity and short cycle life. Based on the fundamental electrochemical process of the sulfur cathode, the capacity fading mechanism of the sulfur cathode is analyzed in details. Combining with the works of our research team, the factors leading to the cathode property fading mechanism are summarized. Firstly, the main issue is that sulfur is both ionically and electrically insulating. And the insoluble low-order lithium polysulfide discharge products are also expected to

  19. Internetwork dynamics

    NARCIS (Netherlands)

    Rutten, R.J.

    1995-01-01

    This review places current research in quiet-Sun chromospheric dynamics in the context of past and future work, concentrating on observational aspects of three-minute oscillations and Ca II K2V grains. The subject is of interest at present because observations and simulations come together to permit

  20. Structural dynamics

    CERN Document Server

    Strømmen, Einar N

    2014-01-01

    This book introduces to the theory of structural dynamics, with focus on civil engineering structures that may be described by line-like beam or beam-column type of systems, or by a system of rectangular plates. Throughout this book the mathematical presentation contains a classical analytical description as well as a description in a discrete finite element format, covering the mathematical development from basic assumptions to the final equations ready for practical dynamic response predictions. Solutions are presented in time domain as well as in frequency domain. Structural Dynamics starts off at a basic level and step by step brings the reader up to a level where the necessary safety considerations to wind or horizontal ground motion induced dynamic design problems can be performed. The special theory of the tuned mass damper has been given a comprehensive treatment, as this is a theory not fully covered elsewhere. For the same reason a chapter on the problem of moving loads on beams has been included.

  1. Coastal Dynamics

    NARCIS (Netherlands)

    Bakker, W.T.

    1998-01-01

    This book deals on "Coastal Dynamics", which will be defined in a narrow sense as a mathematical theory, which starts from given equations of motion for the sediment, which leads with the continuity equation and given boundary conditions to a calculated (eventually schematized) coastal topography,

  2. Membrane dynamics

    DEFF Research Database (Denmark)

    Bendix, Pól Martin

    2015-01-01

    Current topics include membrane-protein interactions with regard to membrane deformation or curvature sensing by BAR domains. Also, we study the dynamics of membrane tubes of both cells and simple model membrane tubes. Finally, we study membrane phase behavior which has important implications...... for the lateral organization of membranes as wells as for physical properties like bending, permeability and elasticity...

  3. Glassy Dynamics

    DEFF Research Database (Denmark)

    Jensen, Henrik J.; Sibani, Paolo

    2007-01-01

    The term glassy dynamics is often used to refer to the extremely slow relaxation observed in several types of many component systems. The time span needed to reach a steady, time independent, state will typically be far beyond experimentally accessible time scales. When melted alloys are cooled d...

  4. Dynamic LIMIDS

    NARCIS (Netherlands)

    Díez, F.J.; Gerven, M.A.J. van

    2011-01-01

    One of the objectives of artificial intelligence is to build decision-support models for systems that evolve over time and include several types of uncertainty. Dynamic limited-memory influence diagrams (DLIMIDs) are a new type of model proposed recently for this kind of problems. DLIMIDs are simila

  5. Dynamic LIMIDS

    NARCIS (Netherlands)

    Díez, F.J.; Gerven, M.A.J. van

    2011-01-01

    One of the objectives of artificial intelligence is to build decision-support models for systems that evolve over time and include several types of uncertainty. Dynamic limited-memory influence diagrams (DLIMIDs) are a new type of model proposed recently for this kind of problems. DLIMIDs are simila

  6. Record dynamics

    DEFF Research Database (Denmark)

    Robe, Dominic M.; Boettcher, Stefan; Sibani, Paolo

    2016-01-01

    -facto irreversible and become increasingly harder to achieve. Thus, a progression of record-sized dynamical barriers are traversed in the approach to equilibration. Accordingly, the statistics of the events is closely described by a log-Poisson process. Originally developed for relaxation in spin glasses...

  7. System Dynamics

    Science.gov (United States)

    Morecroft, John

    System dynamics is an approach for thinking about and simulating situations and organisations of all kinds and sizes by visualising how the elements fit together, interact and change over time. This chapter, written by John Morecroft, describes modern system dynamics which retains the fundamentals developed in the 1950s by Jay W. Forrester of the MIT Sloan School of Management. It looks at feedback loops and time delays that affect system behaviour in a non-linear way, and illustrates how dynamic behaviour depends upon feedback loop structures. It also recognises improvements as part of the ongoing process of managing a situation in order to achieve goals. Significantly it recognises the importance of context, and practitioner skills. Feedback systems thinking views problems and solutions as being intertwined. The main concepts and tools: feedback structure and behaviour, causal loop diagrams, dynamics, are practically illustrated in a wide variety of contexts from a hot water shower through to a symphony orchestra and the practical application of the approach is described through several real examples of its use for strategic planning and evaluation.

  8. Classical dynamics

    CERN Document Server

    Greenwood, Donald T

    1997-01-01

    Graduate-level text for science and technology students provides strong background in the more abstract and intellectually satisfying areas of dynamical theory. Topics include d'Alembert's principle and the idea of virtual work, Hamilton's equations, Hamilton-Jacobi theory, canonical transformations, more. Problems and references at chapter ends.

  9. Internetwork dynamics

    NARCIS (Netherlands)

    Rutten, R.J.

    2001-01-01

    This review places current research in quiet-Sun chromospheric dynamics in the context of past and future work, concentrating on observational aspects of three-minute oscillations and Ca II K2V grains. The subject is of interest at present because observations and simulations come together to permit

  10. Mitotic dynamics

    Institute of Scientific and Technical Information of China (English)

    唐孝威

    1996-01-01

    A new model for mitotic dynamics of eukaryotic cells is proposed. In the kinetochore mo-tor-midzone motor model two kinds of motors, the kinetochore motors and the midzone motors, play important roles in chromosome movement. Using this model the chromosome congression during prometaphase, the chromosome oscillation during metaphase and the chromatid segregation during anaphase are described in a unified way.

  11. Discrete dynamics versus analytic dynamics

    DEFF Research Database (Denmark)

    Toxværd, Søren

    2014-01-01

    For discrete classical Molecular dynamics obtained by the “Verlet” algorithm (VA) with the time increment h there exists a shadow Hamiltonian H˜ with energy E˜(h) , for which the discrete particle positions lie on the analytic trajectories for H˜ . Here, we proof that there, independent...

  12. Applied dynamics

    CERN Document Server

    Schiehlen, Werner

    2014-01-01

    Applied Dynamics is an important branch of engineering mechanics widely applied to mechanical and automotive engineering, aerospace and biomechanics as well as control engineering and mechatronics. The computational methods presented are based on common fundamentals. For this purpose analytical mechanics turns out to be very useful where D’Alembert’s principle in the Lagrangian formulation proves to be most efficient. The method of multibody systems, finite element systems and continuous systems are treated consistently. Thus, students get a much better understanding of dynamical phenomena, and engineers in design and development departments using computer codes may check the results more easily by choosing models of different complexity for vibration and stress analysis.

  13. Fluid dynamics

    CERN Document Server

    Bernard, Peter S

    2015-01-01

    This book presents a focused, readable account of the principal physical and mathematical ideas at the heart of fluid dynamics. Graduate students in engineering, applied math, and physics who are taking their first graduate course in fluids will find this book invaluable in providing the background in physics and mathematics necessary to pursue advanced study. The book includes a detailed derivation of the Navier-Stokes and energy equations, followed by many examples of their use in studying the dynamics of fluid flows. Modern tensor analysis is used to simplify the mathematical derivations, thus allowing a clearer view of the physics. Peter Bernard also covers the motivation behind many fundamental concepts such as Bernoulli's equation and the stream function. Many exercises are designed with a view toward using MATLAB or its equivalent to simplify and extend the analysis of fluid motion including developing flow simulations based on techniques described in the book.

  14. Dynamic capabilities

    DEFF Research Database (Denmark)

    Grünbaum, Niels Nolsøe; Stenger, Marianne

    2013-01-01

    and profitability of small and medium sized manufacturing enterprises operating in volatile environments. A multi-case study design was adopted as research strategy. The findings reveal a positive relationship between dynamic capabilities and innovation performance in the case companies, as we would expect. It was...... it was dominated by a lack of systematism, assessment, monitoring, marketing speculations and feasibility calculation. Furthermore, the sphere was dictated by asymmetric supplier-customer relationships and negotiation power leading, among other possible factors, to meager profitability....

  15. Cybersecurity Dynamics

    Science.gov (United States)

    2014-08-20

    envisioned) Science of Cybersecurity:  Soul: Security (concepts)  Brain: Cybersecurity Dynamics (kind of Complexity Science)  Muscle & Blood ...Complexity Science)  Muscle & Blood : Probability Theory, Number Theory, Abstract Algebra, etc.  Thrust I: Building a systematic theory of...Under-specification, composition and emergent properties. In Proc. NSPW’97, pp. 83–93. [11] A. Kubík. Toward a formalization of emergence. Artif . Life

  16. Hamiltonian dynamics

    CERN Document Server

    Vilasi, Gaetano

    2001-01-01

    This is both a textbook and a monograph. It is partially based on a two-semester course, held by the author for third-year students in physics and mathematics at the University of Salerno, on analytical mechanics, differential geometry, symplectic manifolds and integrable systems. As a textbook, it provides a systematic and self-consistent formulation of Hamiltonian dynamics both in a rigorous coordinate language and in the modern language of differential geometry. It also presents powerful mathematical methods of theoretical physics, especially in gauge theories and general relativity. As a m

  17. PREFACE: Cooperative dynamics Cooperative dynamics

    Science.gov (United States)

    Gov, Nir

    2011-09-01

    The dynamics within living cells are dominated by non-equilibrium processes that consume chemical energy (usually in the form of ATP, adenosine triphosphate) and convert it into mechanical forces and motion. The mechanisms that allow this conversion process are mostly driven by the components of the cytoskeleton: (i) directed (polar) polymerization of filaments (either actin or microtubules) and (ii) molecular motors. The forces and motions produced by these two components of the cytoskeleton give rise to the formation of cellular shapes, and drive the intracellular transport and organization. It is clear that these systems present a multi-scale challenge, from the physics of the molecular processes to the organization of many interacting units. Understanding the physical nature of these systems will have a large impact on many fundamental problems in biology and break new grounds in the field of non-equilibrium physics. This field of research has seen a rapid development over the last ten years. Activities in this area range from theoretical and experimental work on the underlying fundamental (bio)physics at the single-molecule level, to investigations (in vivo and in vitro) of the dynamics and patterns of macroscopic pieces of 'living matter'. In this special issue we have gathered contributions that span the whole spectrum of length- and complexity-scales in this field. Some of the works demonstrate how active forces self-organize within the polymerizing cytoskeleton, on the level of cooperative cargo transport via motors or due to active fluxes at the cell membrane. On a larger scale, it is shown that polar filaments coupled to molecular motors give rise to a huge variety of surprising dynamics and patterns: spontaneously looping rings of gliding microtubules, and emergent phases of self-organized filaments and motors in different geometries. All of these articles share the common feature of being out-of-equilibrium, driven by metabolism. As demonstrated here

  18. Complex dynamics

    CERN Document Server

    Carleson, Lennart

    1993-01-01

    Complex dynamics is today very much a focus of interest. Though several fine expository articles were available, by P. Blanchard and by M. Yu. Lyubich in particular, until recently there was no single source where students could find the material with proofs. For anyone in our position, gathering and organizing the material required a great deal of work going through preprints and papers and in some cases even finding a proof. We hope that the results of our efforts will be of help to others who plan to learn about complex dynamics and perhaps even lecture. Meanwhile books in the field a. re beginning to appear. The Stony Brook course notes of J. Milnor were particularly welcome and useful. Still we hope that our special emphasis on the analytic side will satisfy a need. This book is a revised and expanded version of notes based on lectures of the first author at UCLA over several \\Vinter Quarters, particularly 1986 and 1990. We owe Chris Bishop a great deal of gratitude for supervising the production of cour...

  19. Dynamic assessment of narrative ability in English accurately identifies language impairment in English language learners.

    Science.gov (United States)

    Peña, Elizabeth D; Gillam, Ronald B; Bedore, Lisa M

    2014-12-01

    To assess the identification accuracy of dynamic assessment (DA) of narrative ability in English for children learning English as a 2nd language. A DA task was administered to 54 children: 18 Spanish-English-speaking children with language impairment (LI); 18 age-, sex-, IQ- and language experience-matched typical control children; and an additional 18 age- and language experience-matched comparison children. A variety of quantitative and qualitative measures were collected in the pretest phase, the mediation phase, and the posttest phase of the study. Exploratory discriminant analysis was used to determine the set of measures that best differentiated among this group of children with and without LI. A combination of examiner ratings of modifiability (compliance, metacognition, and task orientation), DA story scores (setting, dialogue, and complexity of vocabulary), and ungrammaticality (derived from the posttest narrative sample) classified children with 80.6% to 97.2% accuracy. DA conducted in English provides a systematic means for measuring learning processes and learning outcomes, resulting in a clinically useful procedure for identifying LIs in bilingual children who are in the process of learning English as a second language.

  20. Gravitational waves from extreme mass-ratio inspirals in Dynamical Chern-Simons gravity

    CERN Document Server

    Pani, Paolo; Gualtieri, Leonardo

    2011-01-01

    Dynamical Chern-Simons gravity is an interesting extension of General Relativity, which finds its way in many different contexts, including string theory, cosmological settings and loop quantum gravity. In this theory, the gravitational field is coupled to a scalar field by a parity-violating term, which gives rise to characteristic signatures. Here we investigate how Chern-Simons gravity would affect the quasi-circular inspiralling of a small, stellar-mass object into a large non-rotating supermassive black hole, and the accompanying emission of gravitational and scalar waves. We find the relevant equations describing the perturbation induced by the small object, and we solve them through the use of Green's function techniques. Our results show that for a wide range of coupling parameters, the Chern-Simons coupling gives rise to an increase in total energy flux, which translates into a fewer number of gravitational-wave cycles over a certain bandwidth. For space-based gravitational-wave detectors such as LIS...

  1. Population dynamics

    Directory of Open Access Journals (Sweden)

    Cooch, E. G.

    2004-06-01

    Full Text Available Increases or decreases in the size of populations over space and time are, arguably, the motivation for much of pure and applied ecological research. The fundamental model for the dynamics of any population is straightforward: the net change over time in the abundance of some population is the simple difference between the number of additions (individuals entering the population minus the number of subtractions (individuals leaving the population. Of course, the precise nature of the pattern and process of these additions and subtractions is often complex, and population biology is often replete with fairly dense mathematical representations of both processes. While there is no doubt that analysis of such abstract descriptions of populations has been of considerable value in advancing our, there has often existed a palpable discomfort when the ‘beautiful math’ is faced with the often ‘ugly realities’ of empirical data. In some cases, this attempted merger is abandoned altogether, because of the paucity of ‘good empirical data’ with which the theoretician can modify and evaluate more conceptually–based models. In some cases, the lack of ‘data’ is more accurately represented as a lack of robust estimates of one or more parameters. It is in this arena that methods developed to analyze multiple encounter data from individually marked organisms has seen perhaps the greatest advances. These methods have rapidly evolved to facilitate not only estimation of one or more vital rates, critical to population modeling and analysis, but also to allow for direct estimation of both the dynamics of populations (e.g., Pradel, 1996, and factors influencing those dynamics (e.g., Nichols et al., 2000. The interconnections between the various vital rates, their estimation, and incorporation into models, was the general subject of our plenary presentation by Hal Caswell (Caswell & Fujiwara, 2004. Caswell notes that although interest has traditionally

  2. Nonlinear dynamics

    Energy Technology Data Exchange (ETDEWEB)

    Turchetti, G. (Bologna Univ. (Italy). Dipt. di Fisica)

    1989-01-01

    Research in nonlinear dynamics is rapidly expanding and its range of applications is extending beyond the traditional areas of science where it was first developed. Indeed while linear analysis and modelling, which has been very successful in mathematical physics and engineering, has become a mature science, many elementary phenomena of intrinsic nonlinear nature were recently experimentally detected and investigated, suggesting new theoretical work. Complex systems, as turbulent fluids, were known to be governed by intrinsically nonlinear laws since a long time ago, but received purely phenomenological descriptions. The pioneering works of Boltzmann and Poincare, probably because of their intrinsic difficulty, did not have a revolutionary impact at their time; it is only very recently that their message is reaching a significant number of mathematicians and physicists. Certainly the development of computers and computer graphics played an important role in developing geometric intuition of complex phenomena through simple numerical experiments, while a new mathematical framework to understand them was being developed.

  3. Superconductor Dynamics

    CERN Document Server

    Gömöry, F

    2014-01-01

    Superconductors used in magnet technology could carry extreme currents because of their ability to keep the magnetic flux motionless. The dynamics of the magnetic flux interaction with superconductors is controlled by this property. The cases of electrical transport in a round wire and the magnetization of wires of various shapes (circular, elliptical, plate) in an external magnetic field are analysed. Resistance to the magnetic field penetration means that the field produced by the superconducting magnet is no longer proportional to the supplied current. It also leads to a dissipation of electromagnetic energy. In conductors with unequal transverse dimensions, such as flat cables, the orientation with respect to the magnetic field plays an essential role. A reduction of magnetization currents can be achieved by splitting the core of a superconducting wire into fine filaments; however, new kinds of electrical currents that couple the filaments consequently appear. Basic formulas allowing qualitative analyses ...

  4. Fluid dynamics

    CERN Document Server

    Ruban, Anatoly I

    This is the first book in a four-part series designed to give a comprehensive and coherent description of Fluid Dynamics, starting with chapters on classical theory suitable for an introductory undergraduate lecture course, and then progressing through more advanced material up to the level of modern research in the field. The present Part 1 consists of four chapters. Chapter 1 begins with a discussion of Continuum Hypothesis, which is followed by an introduction to macroscopic functions, the velocity vector, pressure, density, and enthalpy. We then analyse the forces acting inside a fluid, and deduce the Navier-Stokes equations for incompressible and compressible fluids in Cartesian and curvilinear coordinates. In Chapter 2 we study the properties of a number of flows that are presented by the so-called exact solutions of the Navier-Stokes equations, including the Couette flow between two parallel plates, Hagen-Poiseuille flow through a pipe, and Karman flow above an infinite rotating disk. Chapter 3 is d...

  5. Dynamic Processes

    Science.gov (United States)

    Klingshirn, C.

    The purpose of this chapter is to present the results of the dynamics of exciton (polariton)s or more generally of electron-hole pairs. For a recent review of this topic concentrating on quantum wells, see Davies and Jagadish (Laser Photon. Rev. 3(1), 1(2008)). We neither consider the dynamics of carriers, for example, their relaxation time entering in Hall mobility or electrical conductivity, nor the dynamics of phonons or spins, respectively. We give here only a very small selection of references to these topics (Baxter and Schmuttenmaer, J. Phys. Chem. B, 110:25229, 2006; Queiroz et al. Superlattice Microstruct. 42:270, 2007; Niehaus and Schwarz, Superlattice Microstruct. 42:299, 2007; Lee et al., J. Appl. Phys. 93:4939, 2003; A. K Azad, J. Han, W. Zhang, Appl. Phys. Lett. 88:021103, 2006; Janssen et al., QELS 2008 IEEE 2; D. Lagarde et al., Phys. Stat. Sol. C 4:472, 2007; S. Gosh et al., Appl. Phys. Lett. 86:232507, 2005; W. K. Liu et al. Phys. Rev. Lett. 98:186804, 2007). The main characteristic time constants relevant to optical properties close to the fundamental absorption edge are the dephasing time T 2, (i.e. the time after which the polarization amplitude of the optically excited electron-hole pair loses the coherence with the driving light field), the intra band or inter sub band relaxation times T 3 (i.e. the time it takes for the electron-hole pairs to relax from their initial state of excitation to a certain other state e.g. to a thermal distribution with a temperature equal to or possibly still above lattice temperature) and finally the lifetime T 1 (i.e. the time until the electron-hole pairs recombine). The characteristic time constants T 2 and T 1 are also known as transverse and longitudinal relaxation times, respectively. Their inverses are the corresponding rate constants. T 2 is inversely proportional to the homogeneous width Γ, and T 1 includes both the radiative and the generally dominating non-radiative recombination (Hauser et al., Appl

  6. Internet dynamics

    Science.gov (United States)

    Lukose, Rajan Mathew

    The World Wide Web and the Internet are rapidly expanding spaces, of great economic and social significance, which offer an opportunity to study many phenomena, often previously inaccessible, on an unprecedented scale and resolution with relative ease. These phenomena are measurable on the scale of tens of millions of users and hundreds of millions of pages. By virtue of nearly complete electronic mediation, it is possible in principle to observe the time and ``spatial'' evolution of nearly all choices and interactions. This cyber-space therefore provides a view into a number of traditional research questions (from many academic disciplines) and creates its own new phenomena accessible for study. Despite its largely self-organized and dynamic nature, a number of robust quantitative regularities are found in the aggregate statistics of interesting and useful quantities. These regularities can be understood with the help of models that draw on ideas from statistical physics as well as other fields such as economics, psychology and decision theory. This thesis develops models that can account for regularities found in the statistics of Internet congestion and user surfing patterns and discusses some practical consequences. practical consequences.

  7. Void Dynamics

    Science.gov (United States)

    Padilla, Nelson D.; Paz, Dante; Lares, Marcelo; Ceccarelli, Laura; Lambas, Diego Garcí A.; Cai, Yan-Chuan; Li, Baojiu

    2016-10-01

    Cosmic voids are becoming key players in testing the physics of our Universe.Here we concentrate on the abundances and the dynamics of voids as these are among the best candidatesto provide information on cosmological parameters. Cai, Padilla & Li (2014)use the abundance of voids to tell apart Hu & Sawicki f(R) models from General Relativity. An interestingresult is that even though, as expected, voids in the dark matter field are emptier in f(R) gravity due to the fifth force expellingaway from the void centres, this result is reversed when haloes are used to find voids. The abundance of voids in this casebecomes even lower in f(R) compared to GR for large voids. Still, the differences are significant and thisprovides a way to tell apart these models. The velocity field differences between f(R) and GR, on the other hand, arethe same for halo voids and for dark matter voids.Paz et al. (2013), concentrate on the velocity profiles around voids. First they show the necessityof four parameters to describe the density profiles around voids given two distinct voidpopulations, voids-in-voids and voids-in-clouds. This profile is used to predict peculiar velocities around voids,and the combination of the latter with void density profiles allows the construction of modelvoid-galaxy cross-correlation functions with redshift space distortions. When these modelsare tuned to fit the measured correlation functions for voids and galaxies in the SloanDigital Sky Survey, small voids are found to be of the void-in-cloud type, whereas largerones are consistent with being void-in-void. This is a novel result that is obtaineddirectly from redshift space data around voids. These profiles can be used toremove systematics on void-galaxy Alcock-Pacinsky tests coming from redshift-space distortions.

  8. While Collaboration Is Increasing in the Profession the LIS Dissertation Remains a Solo-Authored Monograph. A Review of: Sugimoto, C. R. (2011. Collaboration in information and library science doctoral education. Library & Information Science Research, 33, 3-11. doi:10.1016/j.lisr.2010.05.003

    Directory of Open Access Journals (Sweden)

    Diana K. Wakimoto

    2011-09-01

    Full Text Available Objective – To investigate collaboration in LIS doctoral education, in particular the extent and perception of collaboration between advisors and advisees, and the dissertation as a collaborative product. Design – Quantitative and qualitative analysis of questionnaire data. Qualitative analysis of interviews. Bibliometric analysis of curricula vitae (CVs and dissertation citations.Setting – American Library Association (ALA-accredited, doctorate-granting schools in the United States and Canada. Subjects – A total of 374 full-time, tenured faculty members with the rank of associate or full professor (advisor group and 294 assistant professors (advisee group comprised the pool of faculty members (n=668 who were sent the questionnaire. Of these, 30 individuals participated in follow-up telephone interviews, which were equally split between the two groups. There were 97 faculty members from the original pool of 668 faculty members were included in the bibliometric analyses. Methods – The author developed two questionnaires, one for the advisors (associate and full professors and one for the advisees (assistant professors, and sent the surveys to faculty members at ALA-accredited schools in the United States and Canada. The questionnaires gathered information about the extent of collaboration and perceptions of collaboration in LIS doctoral education. The author also collected contact information from those interested in participating in a follow-up interview. The author selected the first 30 individuals who responded as the interview participants. The interview participants were split equally between advisors and advisees. A separate subpopulation of 97 faculty members was chosen for the bibliometric analysis phase of the study. These faculty members were chosen with the following criteria: graduation from an ALA-accredited school; full-text of dissertation available online; and a current, full CV available online. CVs were searched to

  9. Dynamical system synchronization

    CERN Document Server

    Luo, Albert C J

    2013-01-01

    Dynamical System Synchronization (DSS) meticulously presents for the first time the theory of dynamical systems synchronization based on the local singularity theory of discontinuous dynamical systems. The book details the sufficient and necessary conditions for dynamical systems synchronizations, through extensive mathematical expression. Techniques for engineering implementation of DSS are clearly presented compared with the existing techniques.  This book also:  Presents novel concepts and methods for dynamical system synchronization Extends beyond the Lyapunov theory for dynamical system synchronization Introduces companion and synchronization of discrete dynamical systems Includes local singularity theory for discontinuous dynamical systems Covers the invariant domains of synchronization Features more than 75 illustrations Dynamical System Synchronization is an ideal book for those interested in better understanding new concepts and methodology for dynamical system synchronization, local singularity...

  10. Fundamentals of structural dynamics

    CERN Document Server

    Craig, Roy R

    2006-01-01

    From theory and fundamentals to the latest advances in computational and experimental modal analysis, this is the definitive, updated reference on structural dynamics.This edition updates Professor Craig's classic introduction to structural dynamics, which has been an invaluable resource for practicing engineers and a textbook for undergraduate and graduate courses in vibrations and/or structural dynamics. Along with comprehensive coverage of structural dynamics fundamentals, finite-element-based computational methods, and dynamic testing methods, this Second Edition includes new and e

  11. OTTO MOTOR DYNAMICS

    OpenAIRE

    Petrescu, Florian Ion Tiberiu; Polytechnic University of Bucharest; Petrescu, Relly Victoria Virgil; Polytechnic University of Bucharest

    2016-01-01

    Otto engine dynamics are similar in almost all common internal combustion engines. We can speak so about dynamics of engines: Lenoir, Otto, and Diesel. The dynamic presented model is simple and original. The first thing necessary in the calculation of Otto engine dynamics, is to determine the inertial mass reduced at the piston. It uses then the Lagrange equation. The dynamic equation of motion of the piston, obtained by integrating the Lagrange equation, takes a new form. It presents a new r...

  12. Dynamical systems theory for music dynamics

    CERN Document Server

    Boon, J P

    1994-01-01

    Abstract:We show that, when music pieces are cast in the form of time series of pitch variations, the concepts and tools of dynamical systems theory can be applied to the analysis of {\\it temporal dynamics} in music. (i) Phase space portraits are constructed from the time series wherefrom the dimensionality is evaluated as a measure of the {\\pit global} dynamics of each piece. (ii) Spectral analysis of the time series yields power spectra (\\sim f^{-\

  13. for hybrid dynamical systems

    Directory of Open Access Journals (Sweden)

    Wassim M. Haddad

    2001-01-01

    Full Text Available In this paper we develop a unified dynamical systems framework for a general class of systems possessing left-continuous flows; that is, left-continuous dynamical systems. These systems are shown to generalize virtually all existing notions of dynamical systems and include hybrid, impulsive, and switching dynamical systems as special cases. Furthermore, we generalize dissipativity, passivity, and nonexpansivity theory to left-continuous dynamical systems. Specifically, the classical concepts of system storage functions and supply rates are extended to left-continuous dynamical systems providing a generalized hybrid system energy interpretation in terms of stored energy, dissipated energy over the continuous-time dynamics, and dissipated energy over the resetting events. Finally, the generalized dissipativity notions are used to develop general stability criteria for feedback interconnections of left-continuous dynamical systems. These results generalize the positivity and small gain theorems to the case of left-continuous, hybrid, and impulsive dynamical systems.

  14. Vibro-impact dynamics

    CERN Document Server

    Luo, Albert C J

    2012-01-01

    Presents a systematic view of vibro-impact dynamics based on the nonlinear dynamics analysis Comprehensive understanding of any vibro-impact system is critically impeded by the lack of analytical tools viable for properly characterizing grazing bifurcation. The authors establish vibro-impact dynamics as a subset of the theory of discontinuous systems, thus enabling all vibro-impact systems to be explored and characterized for applications.  Vibro-impact Dynamics presents an original theoretical way of analyzing the behavior of vibro-impact dynamics that can be extended to discontinuous dynamic

  15. Dynamic statistical information theory

    Institute of Scientific and Technical Information of China (English)

    XING; Xiusan

    2006-01-01

    In recent years we extended Shannon static statistical information theory to dynamic processes and established a Shannon dynamic statistical information theory, whose core is the evolution law of dynamic entropy and dynamic information. We also proposed a corresponding Boltzmman dynamic statistical information theory. Based on the fact that the state variable evolution equation of respective dynamic systems, i.e. Fokker-Planck equation and Liouville diffusion equation can be regarded as their information symbol evolution equation, we derived the nonlinear evolution equations of Shannon dynamic entropy density and dynamic information density and the nonlinear evolution equations of Boltzmann dynamic entropy density and dynamic information density, that describe respectively the evolution law of dynamic entropy and dynamic information. The evolution equations of these two kinds of dynamic entropies and dynamic informations show in unison that the time rate of change of dynamic entropy densities is caused by their drift, diffusion and production in state variable space inside the systems and coordinate space in the transmission processes; and that the time rate of change of dynamic information densities originates from their drift, diffusion and dissipation in state variable space inside the systems and coordinate space in the transmission processes. Entropy and information have been combined with the state and its law of motion of the systems. Furthermore we presented the formulas of two kinds of entropy production rates and information dissipation rates, the expressions of two kinds of drift information flows and diffusion information flows. We proved that two kinds of information dissipation rates (or the decrease rates of the total information) were equal to their corresponding entropy production rates (or the increase rates of the total entropy) in the same dynamic system. We obtained the formulas of two kinds of dynamic mutual informations and dynamic channel

  16. Library and Information Science Doctoral Research Appears to be Showing Less and Less Interest in Library Topics, and Concern among Practitioners May be Justified. A Review of:Finlay, C. S., Sugimoto, C. R., Li, D., & Russell, T. G. (2012. LIS dissertation titles and abstracts (1930–2009: Where have all the librar* gone? The Library Quarterly, 82(1, 29-46. doi:10.1086/662945

    Directory of Open Access Journals (Sweden)

    R. Laval Hunsucker

    2012-09-01

    Full Text Available Objective – To determine whether library andinformation science (LIS doctoral research atNorth American institutions has, over the lasteighty or so years, displayed a clear trendtoward addressing topics other than thoseassociated with librarianship and traditionallibrary functions; and whether one can discern,in this regard, any significant differencesamong those institutions.Design – Conceptual content analysis ofdissertation titles and abstracts.Setting – North American universities withAmerican Library Association accredited LISprograms in the period 1930 through 2009.Subjects – The titles and, to the extentavailable, the abstracts of 3,230 LIS doctoraldissertations completed at these institutionsduring this period.Methods – Having opted for a directed, singlecategorytype content analysis, the researchersbegan by pre-establishing a group of termswhich they assumed could “represent the corecurriculum of the master’s in library science”:terms which they surmised would therefore beable to function, where they appeared in “therecords of doctoral output”, as good indicatorsthat that output itself can rightly be judged tohave had “an explicit focus onlibraries/librarianship” (pp. 36, 44. The termsselected were: “librar*”, “catalog*”, “circulat*”,“collection develop*”, “collection manag*”,“school media”, and “reference” (where “*” indicates truncation, and that any term beginning with the respective letter string was acceptable.The researchers then simply tallied for each of the 3,230 dissertations under investigation how many times one or more of the pre-chosen terms occurred in its title and in its abstract, not recording which term or terms that occurred. (They do not make entirely clear to what extent data collection was computerized. They subsequently analyzed the data longitudinally and by institution, with only one, nominal and dichotomous, variable for the title as well as for the

  17. LIS Education in Portugal between Academia and Practice

    Science.gov (United States)

    Ribeiro, Fernanda

    2008-01-01

    There is a brief exposition, in a historical perspective, about the evolution of the professional education in Portugal, in the area of Library and Information Science, since the creation of the Curso de Bibliotecario-Arquivista, in 1887, until its closure in 1982, when it was replaced by the Curso de Especializacao em Ciencias Documentais (CECD).…

  18. Flora omanikud tülis / Inno Tähismaa

    Index Scriptorium Estoniae

    Tähismaa, Inno, 1970-

    2004-01-01

    Valdusfirma AS-i Flora Kommerts kahe vähemusaktsionäri Rita Kulli ja Elar Kruusma tehingutest Flora gruppi kuuluvate AS-i Flora Vara ja AS-i Flora Liit varaga. Diagramm: Vähemusaktsionärid näitasid võimu. Lisa: Flora juhid. Vt. samas: Kalleim osa kinnisvara

  19. Foot Marks of LIS Journals in DOAJ: an Analytical Study

    OpenAIRE

    Kuri, Ramesh

    2014-01-01

    Directory of Open Access Journals (DOAJ) is a service that provides access to quality controlled Open Access Journals. The aim of the Directory is to increase the visibility and ease of use of open access scientific and scholarly journals thereby promoting their increased usage and impact. The DOAJ which lists the open access scientific and scholarly journals in various subject disciplines was selected to analyze the open access availability of the Library and Information Science discipline. ...

  20. Librarian, Heal Thyself: A Scholarly Communication Analysis of LIS Journals

    Directory of Open Access Journals (Sweden)

    Micah Vandegrift

    2014-04-01

    Full Text Available In Brief This article presents an analysis of 111 Library and Information Science journals based on measurements of “openness” including copyright policies, open access self-archiving policies and open access publishing options. We propose a new metric to rank journals, the J.O.I. Factor (Journal Openness Index, based on measures of openness rather than perceived rank or […

  1. LIS Education in Portugal between Academia and Practice

    Science.gov (United States)

    Ribeiro, Fernanda

    2008-01-01

    There is a brief exposition, in a historical perspective, about the evolution of the professional education in Portugal, in the area of Library and Information Science, since the creation of the Curso de Bibliotecario-Arquivista, in 1887, until its closure in 1982, when it was replaced by the Curso de Especializacao em Ciencias Documentais (CECD).…

  2. HB29 LIS : Handbibliothek Library and Information Studies

    OpenAIRE

    Stiger, Birgit A.; Tinnacher, Judith; Perchtold, Günther

    2007-01-01

    In the course of the academic training for "Library and Information Studies" at the University Library Graz the project team dealt with the introduction of a reference library for "Library and Information Studies". Based on the old HB29 "Information Science" - which was largely out dated and not useable for the participants of the course – the team worked on lists of the books to be stored and those to be acquired including a budget plan. Moreover the team produced a new systematic for the ne...

  3. Positioning Open Access Journals in a LIS Journal Ranking

    Science.gov (United States)

    Xia, Jingfeng

    2012-01-01

    This research uses the h-index to rank the quality of library and information science journals between 2004 and 2008. Selected open access (OA) journals are included in the ranking to assess current OA development in support of scholarly communication. It is found that OA journals have gained momentum supporting high-quality research and…

  4. How to give your users the LIS services they want

    CERN Document Server

    Pantry, Sheila

    2009-01-01

    With the challenges of a constantly changing job market, shifting information-seeking behaviour and a vast array of resources continually being produced, library and information services need to constantly keep one step, or more, ahead of their users. This text helps in understanding users of the services - the what, why, where, when, how and who.

  5. Riikliku autasu saajaid Välis-Eestis / Heino Nurk

    Index Scriptorium Estoniae

    Nurk, Heino

    2004-01-01

    President Arnold Rüütel annetas iseseisvuspäeva puhul teenetemärgi paljudele eestluse hoidjatele ja Eesti NATOga liitumise toetajatele välismaal: Karl Stephen Altau, Väino Riismandel, Kristi Ranfeldt, Gunnar Paabo - Valgetähe IV klass ; Helmut Kalmann, Lya Karm - Valgetähe V klass ; Rein Puusepp - Kotkaristi III klass

  6. lis-Eesti meets tex-mex / Moonika Siimets

    Index Scriptorium Estoniae

    Siimets, Moonika, 1980-

    2012-01-01

    Portreelugu Torontos väliseesti perekonnas sündinud ja paljudes riikides elanud ning kokana töötanud Kristina Luppist, kes sattus Tallinnasse elama seoses Nõukogude Eesti toidukultuurist magistritööd kirjutades. Tex-Mex toiduretseptid s.h Margarita ja Guacamole

  7. lis-Eesti meets tex-mex / Moonika Siimets

    Index Scriptorium Estoniae

    Siimets, Moonika, 1980-

    2012-01-01

    Portreelugu Torontos väliseesti perekonnas sündinud ja paljudes riikides elanud ning kokana töötanud Kristina Luppist, kes sattus Tallinnasse elama seoses Nõukogude Eesti toidukultuurist magistritööd kirjutades. Tex-Mex toiduretseptid s.h Margarita ja Guacamole

  8. Dimensions of Competence: Interpersonal Skills Development within the LIS Curriculum.

    Science.gov (United States)

    Levy, Philippa

    1992-01-01

    Discussion of curriculum innovation in the Department of Information Studies at the University of Sheffield focuses on a course in interpersonal skills development. Topics addressed include trends in library and information science education; transferable skills; experiential learning; a model for interpersonal skills development needed for…

  9. Avameelne lugu teisest Välis-Eestist / Rainer Vilumaa

    Index Scriptorium Estoniae

    Vilumaa, Rainer

    2005-01-01

    Rootsieestlase Kari Bie Erenurme isikunäitus "Karmavõlg" Hobusepea galeriis. Kunstnik jutustab avameelset pihtimuslugu fotograafia, audio-video, installatsiooni ja kollaazhi vahenditega. Autori lühibiograafia

  10. Menetelmiä asiantuntijaorganisaation tuottavuuden lisäämiseksi

    OpenAIRE

    Sirén, Paula

    2017-01-01

    Insinöörityön tarkoituksena oli pohtia, millä keinoilla asiantuntijaorganisaation tuottavuutta saataisiin nostettua. Asiantuntijoiden osaaminen, toimintatavat ja motivaatio korostuvat organisaatiossa, jonka menestyminen on pitkälle kiinni henkilöstöstä. Insinöörityön tavoitteena oli selvittää, mihin asioihin asiantuntijaorganisaatiossa tulisi keskittyä, jotta organisaation tuottavuutta saataisiin nostettua. Tavoitteena oli myös löytää keinoja, joiden avulla esimies voisi vaikuttaa alaist...

  11. Avameelne lugu teisest Välis-Eestist / Rainer Vilumaa

    Index Scriptorium Estoniae

    Vilumaa, Rainer

    2005-01-01

    Rootsieestlase Kari Bie Erenurme isikunäitus "Karmavõlg" Hobusepea galeriis. Kunstnik jutustab avameelset pihtimuslugu fotograafia, audio-video, installatsiooni ja kollaazhi vahenditega. Autori lühibiograafia

  12. Positioning Open Access Journals in a LIS Journal Ranking

    Science.gov (United States)

    Xia, Jingfeng

    2012-01-01

    This research uses the h-index to rank the quality of library and information science journals between 2004 and 2008. Selected open access (OA) journals are included in the ranking to assess current OA development in support of scholarly communication. It is found that OA journals have gained momentum supporting high-quality research and…

  13. Flora omanikud tülis / Inno Tähismaa

    Index Scriptorium Estoniae

    Tähismaa, Inno, 1970-

    2004-01-01

    Valdusfirma AS-i Flora Kommerts kahe vähemusaktsionäri Rita Kulli ja Elar Kruusma tehingutest Flora gruppi kuuluvate AS-i Flora Vara ja AS-i Flora Liit varaga. Diagramm: Vähemusaktsionärid näitasid võimu. Lisa: Flora juhid. Vt. samas: Kalleim osa kinnisvara

  14. Solar Dynamics Observatory

    Data.gov (United States)

    National Aeronautics and Space Administration — A searchable database of all Solar Dynamics Observatory data including EUV, magnetograms, visible light and X-ray. SDO: The Solar Dynamics Observatory is the first...

  15. Dynamic Interactive Learning Systems

    Science.gov (United States)

    Sabry, Khaled; Barker, Jeff

    2009-01-01

    This paper reviews and discusses the notions of interactivity and dynamicity of learning systems in relation to information technologies and design principles that can contribute to interactive and dynamic learning. It explores the concept of dynamic interactive learning systems based on the emerging generation of information as part of a…

  16. Intramolecular and nonlinear dynamics

    Energy Technology Data Exchange (ETDEWEB)

    Davis, M.J. [Argonne National Laboratory, IL (United States)

    1993-12-01

    Research in this program focuses on three interconnected areas. The first involves the study of intramolecular dynamics, particularly of highly excited systems. The second area involves the use of nonlinear dynamics as a tool for the study of molecular dynamics and complex kinetics. The third area is the study of the classical/quantum correspondence for highly excited systems, particularly systems exhibiting classical chaos.

  17. Dynamics of Carroll particles

    NARCIS (Netherlands)

    Bergshoeff, Eric; Gomis, Joaquim; Longhi, Giorgio

    2014-01-01

    We investigate particles whose dynamics are invariant under the Carroll group. Although a single, free such Carroll particle has no non-trivial dynamics (the Carroll particle does not move), we show that non-trivial dynamics exists for a set of interacting Carroll particles. Furthermore, we gauge th

  18. The dynamics of scaffolding

    NARCIS (Netherlands)

    Van Geert, P. L. C.; Steenbeek, H.W.

    2005-01-01

    In this article we have reinterpreted a relatively standard definition of scaffolding in the context of dynamic systems theory. Our main point is that scaffolding cannot be understood outside the context of a dynamic approach of learning and (formal or informal) teaching. We provide a dynamic system

  19. Dynamics at Surfaces

    Energy Technology Data Exchange (ETDEWEB)

    Sylvia Ceyer, Nancy Ryan Gray

    2010-05-04

    The 2009 Gordon Conference on Dynamics at Surfaces is the 30th anniversary of a meeting held every two years that is attended by leading researchers in the area of experimental and theoretical dynamics at liquid and solid surfaces. The conference focuses on the dynamics of the interaction of molecules with either liquid or solid surfaces, the dynamics of the outermost layer of liquid and solid surfaces and the dynamics at the liquid-solid interface. Specific topics that are featured include state-to-state dynamics, non-adiabatic interactions in molecule-metal systems, photon induced desorption from semiconductor and metal surfaces, ultrafast x-ray and electron diffraction as probes of the dynamics of ablation, ultrafast vibrational spectroscopy of water surface dynamics, dynamics of a single adsorbate, growth at nano-scale mineral surfaces, dynamics of atom recombination on interstellar dust grains and the dynamics of the interaction of water with lipid bilayers. The conference brings together investigators from a variety of scientific disciplines including chemistry, physics, materials science, geology and biophysics.

  20. Variable Dynamic Testbed Vehicle: Dynamics Analysis

    Science.gov (United States)

    Lee, A. Y.; Le, N. T.; Marriott, A. T.

    1997-01-01

    The Variable Dynamic Testbed Vehicle (VDTV) concept has been proposed as a tool to evaluate collision avoidance systems and to perform driving-related human factors research. The goal of this study is to analytically investigate to what extent a VDTV with adjustable front and rear anti-roll bar stiffnesses, programmable damping rates, and four-wheel-steering can emulate the lateral dynamics of a broad range of passenger vehicles.

  1. Complexity and Dynamical Depth

    Directory of Open Access Journals (Sweden)

    Terrence Deacon

    2014-07-01

    Full Text Available We argue that a critical difference distinguishing machines from organisms and computers from brains is not complexity in a structural sense, but a difference in dynamical organization that is not well accounted for by current complexity measures. We propose a measure of the complexity of a system that is largely orthogonal to computational, information theoretic, or thermodynamic conceptions of structural complexity. What we call a system’s dynamical depth is a separate dimension of system complexity that measures the degree to which it exhibits discrete levels of nonlinear dynamical organization in which successive levels are distinguished by local entropy reduction and constraint generation. A system with greater dynamical depth than another consists of a greater number of such nested dynamical levels. Thus, a mechanical or linear thermodynamic system has less dynamical depth than an inorganic self-organized system, which has less dynamical depth than a living system. Including an assessment of dynamical depth can provide a more precise and systematic account of the fundamental difference between inorganic systems (low dynamical depth and living systems (high dynamical depth, irrespective of the number of their parts and the causal relations between them.

  2. Electronic, optical and lattice dynamic properties of the novel diamond-like semiconductors Li2CdGeS4 and Li2CdSnS4

    Science.gov (United States)

    Li, Yanlu; Fan, Weiliu; Sun, Honggang; Cheng, Xiufeng; Li, Pan; Zhao, Xian

    2011-06-01

    Li2CdGeS4 and Li2CdSnS4 are novel quaternary diamond-like semiconductors (DLSs) which have been synthesized recently. We present first-principles calculations of their electronic, optical and lattice dynamic properties with the plane-wave pseudopotential method. We have found an indirect band gap of 2.78 eV for Li2CdGeS4 and a direct band gap of 2.50 eV for Li2CdSnS4. The serious stretching vibrations of the Ge/Sn-S and Li-S bonds may enhance their phonon energies, and cause them to exhibit high heat capacities and Debye temperatures, which are promising for nonlinear optical applications. Compared with Cu-based DLSs, Li plays a key role in enlarging the band gaps and increasing the lattice phonon energies, which would increase the thermal conductivity accompanied by an increase of the optical damage threshold.

  3. Synchronization dynamics of two different dynamical systems

    Energy Technology Data Exchange (ETDEWEB)

    Luo, Albert C.J., E-mail: aluo@siue.edu [Department of Mechanical and Industrial Engineering, Southern Illinois University Edwardsville, Edwardsville, IL 62026-1805 (United States); Min Fuhong [Department of Mechanical and Industrial Engineering, Southern Illinois University Edwardsville, Edwardsville, IL 62026-1805 (United States)

    2011-06-15

    Highlights: > Synchronization dynamics of two distinct dynamical systems. > Synchronization, de-synchronization and instantaneous synchronization. > A controlled pendulum synchronizing with the Duffing oscillator. > Synchronization invariant set. > Synchronization parameter map. - Abstract: In this paper, synchronization dynamics of two different dynamical systems is investigated through the theory of discontinuous dynamical systems. The necessary and sufficient conditions for the synchronization, de-synchronization and instantaneous synchronization (penetration or grazing) are presented. Using such a synchronization theory, the synchronization of a controlled pendulum with the Duffing oscillator is systematically discussed as a sampled problem, and the corresponding analytical conditions for the synchronization are presented. The synchronization parameter study is carried out for a better understanding of synchronization characteristics of the controlled pendulum and the Duffing oscillator. Finally, the partial and full synchronizations of the controlled pendulum with periodic and chaotic motions are presented to illustrate the analytical conditions. The synchronization of the Duffing oscillator and pendulum are investigated in order to show the usefulness and efficiency of the methodology in this paper. The synchronization invariant domain is obtained. The technique presented in this paper should have a wide spectrum of applications in engineering. For example, this technique can be applied to the maneuvering target tracking, and the others.

  4. Multiscale Gentlest Ascent Dynamics

    CERN Document Server

    Zhou, Xiang

    2016-01-01

    The gentlest ascent dynamics (E and Zhou in {\\it Nonlinearity} vol 24, p1831, 2011) locally converges to a nearby saddle point with one dimensional unstable manifold. Here we present a multiscale gentlest ascent dynamics for stochastic slow-fast systems in order to compute saddle point associated with the effective dynamics of the slow variable. Such saddle points, as the candidates of transition states, are important in non-equilibrium transitions for the coarse-grained slow variables; they are also helpful to explore free energy surface. We derive the expressions of the gentlest ascent dynamics for the averaged system, and propose the multiscale numerical methods to efficiently solve the multiscale gentlest ascent dynamics for search of saddle point. The examples of stochastic ordinary and partial differential equations are presented to illustrate the performance of this multiscale gentlest ascent dynamics.

  5. Dynamics of Media Attention

    CERN Document Server

    Traag, V A; Hicks, J; van Klinken, G

    2014-01-01

    Studies of human attention dynamics analyses how attention is focused on specific topics, issues or people. In online social media, there are clear signs of exogenous shocks, bursty dynamics, and an exponential or powerlaw lifetime distribution. We here analyse the attention dynamics of traditional media, focussing on co-occurrence of people in newspaper articles. The results are quite different from online social networks and attention. Different regimes seem to be operating at two different time scales. At short time scales we see evidence of bursty dynamics and fast decaying edge lifetimes and attention. This behaviour disappears for longer time scales, and in that regime we find Poissonian dynamics and slower decaying lifetimes. We propose that a cascading Poisson process may take place, with issues arising at a constant rate over a long time scale, and faster dynamics at a shorter time scale.

  6. Dynamic Boiler Performance

    DEFF Research Database (Denmark)

    Sørensen, Kim

    Traditionally, boilers have been designed mainly focussing on the static operation of the plant. The dynamic capability has been given lower priority and the analysis has typically been limited to assuring that the plant was not over-stressed due to large temperature gradients. New possibilities...... for buying and selling energy has increased the focus on the dynamic operation capability, efciency, emissions etc. For optimizing the design of boilers for dynamic operation a quantication of the dynamic capability is needed. A framework for optimizing design of boilers for dynamic operation has been...... developed. Analyzing boilers for dynamic operation gives rise to a number of opposing aims: shrinking and swelling, steam quality, stress levels, control system/philosophy, pressurization etc. Common for these opposing aims is that an optimum can be found for selected operation conditions. The framework has...

  7. Dynamic Capabilities and Performance

    DEFF Research Database (Denmark)

    Wilden, Ralf; Gudergan, Siegfried P.; Nielsen, Bo Bernhard

    2013-01-01

    Dynamic capabilities are widely considered to incorporate those processes that enable organizations to sustain superior performance over time. In this paper, we argue theoretically and demonstrate empirically that these effects are contingent on organizational structure and the competitive...... are contingent on the competitive intensity faced by firms. Our findings demonstrate the performance effects of internal alignment between organizational structure and dynamic capabilities, as well as the external fit of dynamic capabilities with competitive intensity. We outline the advantages of PLS...

  8. Dynamical Constraints on Exoplanets

    CERN Document Server

    Horner, Jonti; Tinney, Chris; Hinse, Tobias C; Marshall, Jonathan P

    2013-01-01

    Dynamical studies of new exoplanet systems are a critical component of the discovery and characterisation process. Such studies can provide firmer constraints on the parameters of the newly discovered planets, and may even reveal that the proposed planets do not stand up to dynamical scrutiny. Here, we demonstrate how dynamical studies can assist the characterisation of such systems through two examples: QS Virginis and HD 73526.

  9. ON NONDETERMINISTIC DYNAMIC PROGRAMMING

    OpenAIRE

    2008-01-01

    R. Bellman left a lot of research problems in his work “Dynamic Programming" (1957). Having received ideas from Bellman, S. Iwamoto has extracted, out of his problems, a problem on nondeterministic dynamic programming (NDP). Instead of stochastic dynamic programming which has been well studied, Iwamoto has opened a gate to NDP. This report presents speci_c optimal solutions for NDPs on continuous state and decision spaces.

  10. Dynamical Systems Conference

    CERN Document Server

    Gils, S; Hoveijn, I; Takens, F; Nonlinear Dynamical Systems and Chaos

    1996-01-01

    Symmetries in dynamical systems, "KAM theory and other perturbation theories", "Infinite dimensional systems", "Time series analysis" and "Numerical continuation and bifurcation analysis" were the main topics of the December 1995 Dynamical Systems Conference held in Groningen in honour of Johann Bernoulli. They now form the core of this work which seeks to present the state of the art in various branches of the theory of dynamical systems. A number of articles have a survey character whereas others deal with recent results in current research. It contains interesting material for all members of the dynamical systems community, ranging from geometric and analytic aspects from a mathematical point of view to applications in various sciences.

  11. Dynamics of machinery

    CERN Document Server

    Dresig, Hans

    2010-01-01

    Dynamic loads and disturbing oscillations increase with higher speed of the machines and more lightweight constructions. Industrial safety standards require better oscillation reduction and noise control. The book by Dresig/Holzweissig deals with these topics. It presents the classical areas of modeling, dynamics of rigid bodies, balancing, torsional and bending vibrations, problems of vibration isolation and the dynamic behavior of complex vibrating systems. Typical dynamic effects, i.e., the gyroscopic effect, the damping of oscillations, resonances of k-th order, subharmonic and nonlinear f

  12. Structural Dynamics Laboratory (SDL)

    Data.gov (United States)

    Federal Laboratory Consortium — Structural dynamic testing is performed to verify the survivability of a component or assembly when exposed to vibration stress screening, or a controlled simulation...

  13. Symplectic algebraic dynamics algorithm

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    Based on the algebraic dynamics solution of ordinary differential equations andintegration of  ,the symplectic algebraic dynamics algorithm sn is designed,which preserves the local symplectic geometric structure of a Hamiltonian systemand possesses the same precision of the na ve algebraic dynamics algorithm n.Computer experiments for the 4th order algorithms are made for five test modelsand the numerical results are compared with the conventional symplectic geometric algorithm,indicating that sn has higher precision,the algorithm-inducedphase shift of the conventional symplectic geometric algorithm can be reduced,and the dynamical fidelity can be improved by one order of magnitude.

  14. Nonlinear dynamics and complexity

    CERN Document Server

    Luo, Albert; Fu, Xilin

    2014-01-01

    This important collection presents recent advances in nonlinear dynamics including analytical solutions, chaos in Hamiltonian systems, time-delay, uncertainty, and bio-network dynamics. Nonlinear Dynamics and Complexity equips readers to appreciate this increasingly main-stream approach to understanding complex phenomena in nonlinear systems as they are examined in a broad array of disciplines. The book facilitates a better understanding of the mechanisms and phenomena in nonlinear dynamics and develops the corresponding mathematical theory to apply nonlinear design to practical engineering.

  15. Essential dynamics and relativity

    CERN Document Server

    O'Donnell, Peter J

    2014-01-01

    Essential Dynamics & Relativity provides students with an introduction to the core aspects of dynamics and special relativity. The author reiterates important ideas and terms throughout and covers concepts that are often missing from other textbooks at this level. He also places each topic within the wider constructs of the theory, without jumping from topic to topic to illustrate a point.The first section of the book focuses on dynamics, discussing the basic aspects of single particle motion and analyzing the motion of multi-particle systems. The book also explains the dynamical behavior of b

  16. Introduction to dynamic programming

    CERN Document Server

    Cooper, Leon; Rodin, E Y

    1981-01-01

    Introduction to Dynamic Programming provides information pertinent to the fundamental aspects of dynamic programming. This book considers problems that can be quantitatively formulated and deals with mathematical models of situations or phenomena that exists in the real world.Organized into 10 chapters, this book begins with an overview of the fundamental components of any mathematical optimization model. This text then presents the details of the application of dynamic programming to variational problems. Other chapters consider the application of dynamic programming to inventory theory, Mark

  17. Dynamic power flow controllers

    Science.gov (United States)

    Divan, Deepakraj M.; Prasai, Anish

    2017-03-07

    Dynamic power flow controllers are provided. A dynamic power flow controller may comprise a transformer and a power converter. The power converter is subject to low voltage stresses and not floated at line voltage. In addition, the power converter is rated at a fraction of the total power controlled. A dynamic power flow controller controls both the real and the reactive power flow between two AC sources having the same frequency. A dynamic power flow controller inserts a voltage with controllable magnitude and phase between two AC sources; thereby effecting control of active and reactive power flows between two AC sources.

  18. Partial Dynamical Symmetry and Mixed Dynamics

    CERN Document Server

    Leviatan, A

    1996-01-01

    Partial dynamical symmetry describes a situation in which some eigenstates have a symmetry which the quantum Hamiltonian does not share. This property is shown to have a classical analogue in which some tori in phase space are associated with a symmetry which the classical Hamiltonian does not share. A local analysis in the vicinity of these special tori reveals a neighbourhood of phase space foliated by tori. This clarifies the suppression of classical chaos associated with partial dynamical symmetry. The results are used to divide the states of a mixed system into ``chaotic'' and ``regular'' classes.

  19. Dynamical Non-Equilibrium Molecular Dynamics

    Directory of Open Access Journals (Sweden)

    Giovanni Ciccotti

    2013-12-01

    Full Text Available In this review, we discuss the Dynamical approach to Non-Equilibrium Molecular Dynamics (D-NEMD, which extends stationary NEMD to time-dependent situations, be they responses or relaxations. Based on the original Onsager regression hypothesis, implemented in the nineteen-seventies by Ciccotti, Jacucci and MacDonald, the approach permits one to separate the problem of dynamical evolution from the problem of sampling the initial condition. D-NEMD provides the theoretical framework to compute time-dependent macroscopic dynamical behaviors by averaging on a large sample of non-equilibrium trajectories starting from an ensemble of initial conditions generated from a suitable (equilibrium or non-equilibrium distribution at time zero. We also discuss how to generate a large class of initial distributions. The same approach applies also to the calculation of the rate constants of activated processes. The range of problems treatable by this method is illustrated by discussing applications to a few key hydrodynamic processes (the “classical” flow under shear, the formation of convective cells and the relaxation of an interface between two immiscible liquids.

  20. Dynamic normal forms and dynamic characteristic polynomial

    DEFF Research Database (Denmark)

    Frandsen, Gudmund Skovbjerg; Sankowski, Piotr

    2011-01-01

    with relative error 2−b in additional O(nlog2nlogb) time. Furthermore, it can be used to dynamically maintain the singular value decomposition (SVD) of a generic matrix. Together with the algorithm, the hardness of the problem is studied. For the symmetric case, we present an Ω(n2) lower bound for rank...

  1. Bisimulation of Dynamical Systems

    NARCIS (Netherlands)

    Schaft, Arjan van der

    2004-01-01

    A general notion of bisimulation is studied for dynamical systems. An algebraic characterization of bisimulation together with an algorithm for computing the maximal bisimulation relation is derived using geometric control theory. Bisimulation of dynamical systems is shown to be a concept which

  2. Dynamic Calorimetry for Students

    Science.gov (United States)

    Kraftmakher, Yaakov

    2007-01-01

    A student experiment on dynamic calorimetry is described. Dynamic calorimetry is a powerful technique for calorimetric studies, especially at high temperatures and pressures. A low-power incandescent lamp serves as the sample. The ScienceWorkshop data-acquisition system with DataStudio software from PASCO Scientific displays the results of the…

  3. Dynamic Latent Classification Model

    DEFF Research Database (Denmark)

    Zhong, Shengtong; Martínez, Ana M.; Nielsen, Thomas Dyhre

    as possible. Motivated by this problem setting, we propose a generative model for dynamic classification in continuous domains. At each time point the model can be seen as combining a naive Bayes model with a mixture of factor analyzers (FA). The latent variables of the FA are used to capture the dynamics...... in the process as well as modeling dependences between attributes....

  4. Space Manifold dynamics

    OpenAIRE

    Gómez, Gerard; Barrabés Vera, Esther

    2011-01-01

    The term Space Manifold Dynamics (SMD) has been proposed for encompassing the various applications of Dynamical Systems methods to spacecraft mission analysis and design, ranging from the exploitation of libration orbits around the collinear Lagrangian points to the design of optimal station-keeping and eclipse avoidance manoeuvres or the determination of low energy lunar and interplanetary transfers

  5. Team coordination dynamics.

    Science.gov (United States)

    Gorman, Jamie C; Amazeen, Polemnia G; Cooke, Nancy J

    2010-07-01

    Team coordination consists of both the dynamics of team member interaction and the environmental dynamics to which a team is subjected. Focusing on dynamics, an approach is developed that contrasts with traditional aggregate-static concepts of team coordination as characterized by the shared mental model approach. A team coordination order parameter was developed to capture momentary fluctuations in coordination. Team coordination was observed in three-person uninhabited air vehicle teams across two experimental sessions. The dynamics of the order parameter were observed under changes of a team familiarity control parameter. Team members returned for the second session to either the same (Intact) or different (Mixed) team. 'Roadblock' perturbations, or novel changes in the task environment, were introduced in order to probe the stability of team coordination. Nonlinear dynamic methods revealed differences that a traditional approach did not: Intact and Mixed team coordination dynamics looked very different; Mixed teams were more stable than Intact teams and explored the space of solutions without the need for correction. Stability was positively correlated with the number of roadblock perturbations that were overcome successfully. The novel and non-intuitive contribution of a dynamical analysis was that Mixed teams, who did not have a long history working together, were more adaptive. Team coordination dynamics carries new implications for traditional problems such as training adaptive teams.

  6. Dynamic defense workshop :

    Energy Technology Data Exchange (ETDEWEB)

    Crosby, Sean Michael; Doak, Justin E.; Haas, Jason Juedes.; Helinski, Ryan; Lamb, Christopher C.

    2013-02-01

    On September 5th and 6th, 2012, the Dynamic Defense Workshop: From Research to Practice brought together researchers from academia, industry, and Sandia with the goals of increasing collaboration between Sandia National Laboratories and external organizations, de ning and un- derstanding dynamic, or moving target, defense concepts and directions, and gaining a greater understanding of the state of the art for dynamic defense. Through the workshop, we broadened and re ned our de nition and understanding, identi ed new approaches to inherent challenges, and de ned principles of dynamic defense. Half of the workshop was devoted to presentations of current state-of-the-art work. Presentation topics included areas such as the failure of current defenses, threats, techniques, goals of dynamic defense, theory, foundations of dynamic defense, future directions and open research questions related to dynamic defense. The remainder of the workshop was discussion, which was broken down into sessions on de ning challenges, applications to host or mobile environments, applications to enterprise network environments, exploring research and operational taxonomies, and determining how to apply scienti c rigor to and investigating the eld of dynamic defense.

  7. Dynamical inverse problems

    CERN Document Server

    Gladwell, Graham ML

    2011-01-01

    The papers in this volume present an overview of the general aspects and practical applications of dynamic inverse methods, through the interaction of several topics, ranging from classical and advanced inverse problems in vibration, isospectral systems, dynamic methods for structural identification, active vibration control and damage detection, imaging shear stiffness in biological tissues, wave propagation, to computational and experimental aspects relevant for engineering problems.

  8. Transformations, Dynamics and Complexity

    CERN Document Server

    Glazunov, Nikolaj

    2011-01-01

    We review and investigate some new problems and results in the field of dynamical systems generated by iteration of maps, {\\beta}-transformations, partitions, group actions, bundle dynamical systems, Hasse-Kloosterman maps, and some aspects of complexity of the systems.

  9. EU Budgetary Dynamics

    DEFF Research Database (Denmark)

    Citi, Manuele

    2013-01-01

    and change in the EU in light of the two models of policy dynamics currently existing in the literature: the incrementalist model and the punctuated equilibrium model. The analysis of long series of original data extracted from the EU budget shows that EU policies do not evolve following an incrementalist...... pattern, but by a punctuated equilibrium dynamic....

  10. Dynamic public service mediation

    NARCIS (Netherlands)

    Hofman, W.; Staalduinen, M. van

    2010-01-01

    This paper presents an approach to dynamic public service mediation. It is based on a conceptual model and the use of search and ranking algorithms. The conceptual model is based on Abstract State Machine theory. Requirements for dynamic service mediation were derived from a real-world case. The con

  11. Probabilistic Dynamic Epistemic Logic

    NARCIS (Netherlands)

    Kooi, B.P.

    2003-01-01

    In this paper I combine the dynamic epistemic logic of Gerbrandy (1999) with the probabilistic logic of Fagin and Halpern (1999). The result is a new probabilistic dynamic epistemic logic, a logic for reasoning about probability, information, and information change that takes higher order informatio

  12. Visualizing Dynamic Memory Allocations

    NARCIS (Netherlands)

    Moreta, Sergio; Telea, Alexandru

    2007-01-01

    We present a visualization tool for dynamic memory allocation information obtained from instrumenting the runtime allocator used by C programs. The goal of the presented visualization techniques is to convey insight in the dynamic behavior of the allocator. The purpose is to help the allocator desig

  13. Dynamic covalent surfactants

    NARCIS (Netherlands)

    Minkenberg, C.B.

    2012-01-01

    In this thesis the development of surfactant aggregates with fast exchange dynamics between the aggregated and non-aggregated state is described. Dynamic surfactant exchange plays an important role in natural systems, for instance in cell signaling, cell division, and uptake and release of cargo. Re

  14. Applications of fluid dynamics

    Energy Technology Data Exchange (ETDEWEB)

    Round, G.R.; Garg, V.K.

    1986-01-01

    This book describes flexible and practical approach to learning the basics of fluid dynamics. Each chapter is a self-contained work session and includes a fluid dynamics concept, an explanation of the principles involved, an illustration of their application and references on where more detailed discussions can be found.

  15. Dynamic Calorimetry for Students

    Science.gov (United States)

    Kraftmakher, Yaakov

    2007-01-01

    A student experiment on dynamic calorimetry is described. Dynamic calorimetry is a powerful technique for calorimetric studies, especially at high temperatures and pressures. A low-power incandescent lamp serves as the sample. The ScienceWorkshop data-acquisition system with DataStudio software from PASCO Scientific displays the results of the…

  16. Dynamic reservoir well interaction

    NARCIS (Netherlands)

    Sturm, W.L.; Belfroid, S.P.C.; Wolfswinkel, O. van; Peters, M.C.A.M.; Verhelst, F.J.P.C.M.

    2004-01-01

    In order to develop smart well control systems for unstable oil wells, realistic modeling of the dynamics of the well is essential. Most dynamic well models use a semi-steady state inflow model to describe the inflow of oil and gas from the reservoir. On the other hand, reservoir models use steady s

  17. Vehicle Dynamics and Control

    CERN Document Server

    Rajamani, Rajesh

    2012-01-01

    Vehicle Dynamics and Control provides a comprehensive coverage of vehicle control systems and the dynamic models used in the development of these control systems. The control system applications covered in the book include cruise control, adaptive cruise control, ABS, automated lane keeping, automated highway systems, yaw stability control, engine control, passive, active and semi-active suspensions, tire-road friction coefficient estimation, rollover prevention, and hybrid electric vehicle. In developing the dynamic model for each application, an effort is made to both keep the model simple enough for control system design but at the same time rich enough to capture the essential features of the dynamics. A special effort has been made to explain the several different tire models commonly used in literature and to interpret them physically. In the second edition of the book, chapters on roll dynamics, rollover prevention and hybrid electric vehicles have been added, and the chapter on electronic stability co...

  18. Nonlinear dynamics of structures

    CERN Document Server

    Oller, Sergio

    2014-01-01

    This book lays the foundation of knowledge that will allow a better understanding of nonlinear phenomena that occur in structural dynamics.   This work is intended for graduate engineering students who want to expand their knowledge on the dynamic behavior of structures, specifically in the nonlinear field, by presenting the basis of dynamic balance in non‐linear behavior structures due to the material and kinematics mechanical effects.   Particularly, this publication shows the solution of the equation of dynamic equilibrium for structure with nonlinear time‐independent materials (plasticity, damage and frequencies evolution), as well as those time dependent non‐linear behavior materials (viscoelasticity and viscoplasticity). The convergence conditions for the non‐linear dynamic structure solution  are studied, and the theoretical concepts and its programming algorithms are presented.  

  19. Financial market dynamics

    Science.gov (United States)

    Michael, Fredrick; Johnson, M. D.

    2003-03-01

    A necessary precondition for modeling financial markets is a complete understanding of their statistics, including dynamics. Distributions derived from nonextensive Tsallis statistics are closely connected with dynamics described by a nonlinear Fokker-Planck equation. The combination shows promise in describing stochastic processes with power-law distributions and superdiffusive dynamics. We investigate intra-day price changes in the S& P500 stock index within this framework. We find that the power-law tails of the distributions, and the index's anomalously diffusing dynamics, are very accurately described by this approach. Our results show good agreement between market data and Fokker-Planck dynamics. This approach may be applicable in any anomalously diffusing system in which the correlations in time can be accounted for by an Ito-Langevin process with a simple time-dependent diffusion coefficient.

  20. Dynamic fracture mechanics

    Science.gov (United States)

    Kobayashi, A. S.; Ramulu, M.

    1985-01-01

    Dynamic fracture and crack propagation concepts for ductile materials are reviewed. The equations for calculating dynamic stress integrity and the dynamic energy release rate in order to study dynamic crack propagation are provided. The stress intensity factor versus crack velocity relation is investigated. The uses of optical experimental techniques and finite element methods for fracture analyses are described. The fracture criteria for a rapidly propagating crack under mixed mode conditions are discussed; crack extension and fracture criteria under combined tension and shear loading are based on maximum circumferential stress or energy criteria such as strain energy density. The development and use of a Dugdale model and finite element models to represent crack and fracture dynamics are examined.

  1. Dynamics of aesthetic appreciation

    Science.gov (United States)

    Carbon, Claus-Christian

    2012-03-01

    Aesthetic appreciation is a complex cognitive processing with inherent aspects of cold as well as hot cognition. Research from the last decades of empirical has shown that evaluations of aesthetic appreciation are highly reliable. Most frequently, facial attractiveness was used as the corner case for investigating aesthetic appreciation. Evaluating facial attractiveness shows indeed high internal consistencies and impressively high inter-rater reliabilities, even across cultures. Although this indicates general and stable mechanisms underlying aesthetic appreciation, it is also obvious that our taste for specific objects changes dynamically. Aesthetic appreciation on artificial object categories, such as fashion, design or art is inherently very dynamic. Gaining insights into the cognitive mechanisms that trigger and enable corresponding changes of aesthetic appreciation is of particular interest for research as this will provide possibilities to modeling aesthetic appreciation for longer durations and from a dynamic perspective. The present paper refers to a recent two-step model ("the dynamical two-step-model of aesthetic appreciation"), dynamically adapting itself, which accounts for typical dynamics of aesthetic appreciation found in different research areas such as art history, philosophy and psychology. The first step assumes singular creative sources creating and establishing innovative material towards which, in a second step, people adapt by integrating it into their visual habits. This inherently leads to dynamic changes of the beholders' aesthetic appreciation.

  2. From Molecular Dynamics to Brownian Dynamics

    CERN Document Server

    Erban, Radek

    2014-01-01

    Three coarse-grained molecular dynamics (MD) models are investigated with the aim of developing and analyzing multiscale methods which use MD simulations in parts of the computational domain and (less detailed) Brownian dynamics (BD) simulations in the remainder of the domain. The first MD model is formulated in one spatial dimension. It is based on elastic collisions of heavy molecules (e.g. proteins) with light point particles (e.g. water molecules). Two three-dimensional MD models are then investigated. The obtained results are applied to a simplified model of protein binding to receptors on the cellular membrane. It is shown that modern BD simulators of intracellular processes can be used in the bulk and accurately coupled with a (more detailed) MD model of protein binding which is used close to the membrane.

  3. Dynamic Recrystallization: The Dynamic Deformation Regime

    Science.gov (United States)

    Murr, L. E.; Pizaña, C.

    2007-11-01

    Severe plastic deformation (PD), especially involving high strain rates (>103 s 1), occurs through solid-state flow, which is accommodated by dynamic recrystallization (DRX), either in a continuous or discontinuous mode. This flow can be localized in shear instability zones (or adiabatic shear bands (ASBs)) with dimensions smaller than 5 μ, or can include large volumes with flow zone dimensions exceeding centimeters. This article illustrates these microstructural features using optical and electron metallography to examine a host of dynamic deformation examples: shaped charge jet formation, high-velocity and hypervelocity impact crater formation, rod penetration into thick targets (which includes rod and target DRX flow and mixing), large projectile-induced target plug formation and failure, explosive welding, and friction-stir welding and processing. The DRX is shown to be a universal mechanism that accommodates solid-state flow in extreme (or severe) PD regimes.

  4. Fundamentals of gas dynamics

    CERN Document Server

    Babu, V

    2014-01-01

    Fundamentals of Gas Dynamics, Second Edition isa comprehensively updated new edition and now includes a chapter on the gas dynamics of steam. It covers the fundamental concepts and governing equations of different flows, and includes end of chapter exercises based on the practical applications. A number of useful tables on the thermodynamic properties of steam are also included.Fundamentals of Gas Dynamics, Second Edition begins with an introduction to compressible and incompressible flows before covering the fundamentals of one dimensional flows and normal shock wav

  5. The dynamics of leadership

    Directory of Open Access Journals (Sweden)

    C. J. A. Vos

    2002-08-01

    Full Text Available The dynamics of leadership This article reflects on the need for dynamic leadership. An organisation'sfunctionality is dependent on the intellectual, emotional andphysical energy which the people involved in the organisation arewilling to contribute. The process of energy release is determined mainlyby two concepts: vision and mission. A vision is inextricably linked to astrategy. Leadership plays an essential part in the realisation of anorganisation's vision and mission. In this article different leadershipmodels are discussed. Autocratic leadership is critically analysed.Dynamic leadership, which encompasses inspirational and imaginativeleadership is discussed. The community of faith and society both have alife-long need for inspirational leadership.

  6. Shadowing in dynamical systems

    CERN Document Server

    Pilyugin, Sergei Yu

    1999-01-01

    This book is an introduction to the theory of shadowing of approximate trajectories in dynamical systems by exact ones. This is the first book completely devoted to the theory of shadowing. It shows the importance of shadowing theory for both the qualitative theory of dynamical systems and the theory of numerical methods. Shadowing Methods allow us to estimate differences between exact and approximate solutions on infinite time intervals and to understand the influence of error terms. The book is intended for specialists in dynamical systems, for researchers and graduate students in the theory of numerical methods.

  7. Stability of dynamical systems

    CERN Document Server

    Liao, Xiaoxin; Yu, P 0

    2007-01-01

    The main purpose of developing stability theory is to examine dynamic responses of a system to disturbances as the time approaches infinity. It has been and still is the object of intense investigations due to its intrinsic interest and its relevance to all practical systems in engineering, finance, natural science and social science. This monograph provides some state-of-the-art expositions of major advances in fundamental stability theories and methods for dynamic systems of ODE and DDE types and in limit cycle, normal form and Hopf bifurcation control of nonlinear dynamic systems.ʺ Presents

  8. Elements of analytical dynamics

    CERN Document Server

    Kurth, Rudolph; Stark, M

    1976-01-01

    Elements of Analytical Dynamics deals with dynamics, which studies the relationship between motion of material bodies and the forces acting on them. This book is a compilation of lectures given by the author at the Georgia and Institute of Technology and formed a part of a course in Topological Dynamics. The book begins by discussing the notions of space and time and their basic properties. It then discusses the Hamilton-Jacobi theory and Hamilton's principle and first integrals. The text concludes with a discussion on Jacobi's geometric interpretation of conservative systems. This book will

  9. Real estate investment dynamics

    OpenAIRE

    Gruber, Johannes

    2010-01-01

    This thesis is motivated by the steadily increasing interest in the dynamic relationship between the macro-economy and the real estate sector. One of the main issues in this respect is to study the investment dynamics. Since the bursting of the U.S. housing bubble in 2006 is identified as the point of origin of the so called subprime crises, which led to the collapse of the U.S. financial system, the dynamics of real estate investments is of particular interest. In the first part of my the...

  10. High enthalpy gas dynamics

    CERN Document Server

    Rathakrishnan, Ethirajan

    2014-01-01

    This is an introductory level textbook which explains the elements of high temperature and high-speed gas dynamics. written in a clear and easy to follow style, the author covers all the latest developments in the field including basic thermodynamic principles, compressible flow regimes and waves propagation in one volume covers theoretical modeling of High Enthalpy Flows, with particular focus on problems in internal and external gas-dynamic flows, of interest in the fields of rockets propulsion and hypersonic aerodynamics High enthalpy gas dynamics is a compulsory course for aerospace engine

  11. Basic structural dynamics

    CERN Document Server

    Anderson, James C

    2012-01-01

    A concise introduction to structural dynamics and earthquake engineering Basic Structural Dynamics serves as a fundamental introduction to the topic of structural dynamics. Covering single and multiple-degree-of-freedom systems while providing an introduction to earthquake engineering, the book keeps the coverage succinct and on topic at a level that is appropriate for undergraduate and graduate students. Through dozens of worked examples based on actual structures, it also introduces readers to MATLAB, a powerful software for solving both simple and complex structural d

  12. Recovery of dynamic interference

    CERN Document Server

    Baghery, Mehrdad; Rost, Jan M

    2016-01-01

    We develop general quantitative criteria for dynamic interference, a manifestation of double-slit interference in time which should be realizable with brilliant state-of-the-art high-frequency laser sources. Our analysis reveals that the observation of dynamic interference hinges upon maximizing the difference between the dynamic polarization of the initial bound and the final continuum state of the electron during the light pulse, while keeping depletion of the initial state small. Confirmed by numerical results, we predict that this is impossible for the hydrogen ground-state but feasible with excited states explicitly exemplified with the hydrogen 2p-state.

  13. Theoretical Fluid Dynamics

    CERN Document Server

    Shivamoggi, Bhimsen K

    1998-01-01

    "Although there are many texts and monographs on fluid dynamics, I do not know of any which is as comprehensive as the present book. It surveys nearly the entire field of classical fluid dynamics in an advanced, compact, and clear manner, and discusses the various conceptual and analytical models of fluid flow." - Foundations of Physics on the first edition. Theoretical Fluid Dynamics functions equally well as a graduate-level text and a professional reference. Steering a middle course between the empiricism of engineering and the abstractions of pure mathematics, the author focuses

  14. Discrete Dynamics Lab

    Science.gov (United States)

    Wuensche, Andrew

    DDLab is interactive graphics software for creating, visualizing, and analyzing many aspects of Cellular Automata, Random Boolean Networks, and Discrete Dynamical Networks in general and studying their behavior, both from the time-series perspective — space-time patterns, and from the state-space perspective — attractor basins. DDLab is relevant to research, applications, and education in the fields of complexity, self-organization, emergent phenomena, chaos, collision-based computing, neural networks, content addressable memory, genetic regulatory networks, dynamical encryption, generative art and music, and the study of the abstract mathematical/physical/dynamical phenomena in their own right.

  15. Thermofield dynamics and Gravity

    CERN Document Server

    Nair, V P

    2015-01-01

    Thermofield dynamics is presented in terms of a path-integral using coherent states, equivalently, using a coadjoint orbit action. A field theoretic formulation in terms of fields on a manifold ${\\mathcal M} \\times {\\tilde{\\mathcal M}}$ where the two components have opposite orientation is also presented. We propose formulating gravitational dynamics for noncommutative geometry using thermofield dynamics, doubling the Hilbert space modeling the noncommutative space. We consider 2+1 dimensions in some detail and since ${\\mathcal M}$ and ${\\tilde{\\mathcal M}}$ have opposite orientation, the commutative limit leads to the Einstein-Hilbert action as the difference of two Chern-Simons actions.

  16. Dynamics of Tectonic Plates

    CERN Document Server

    Pechersky, E; Sadowski, G; Yambartsev, A

    2014-01-01

    We suggest a model that describes a mutual dynamic of tectonic plates. The dynamic is a sort of stick-slip one which is modeled by a Markov random process. The process defines a microlevel of the dynamic. A macrolevel is obtained by a scaling limit which leads to a system of integro-differential equations which determines a kind of mean field systems. Conditions when Gutenberg-Richter empirical law are presented on the mean field level. These conditions are rather universal and do not depend on features of resistant forces.

  17. Dynamics of Tectonic Plates

    OpenAIRE

    2014-01-01

    We suggest a model that describes a mutual dynamic of tectonic plates. The dynamic is a sort of stick-slip one which is modeled by a Markov random process. The process defines a microlevel of the dynamic. A macrolevel is obtained by a scaling limit which leads to a system of integro-differential equations which determines a kind of mean field systems. Conditions when Gutenberg-Richter empirical law are presented on the mean field level. These conditions are rather universal and do not depend ...

  18. Fluid dynamics transactions

    CERN Document Server

    Fiszdon, W

    1965-01-01

    Fluid Dynamics Transactions, Volume 2 compiles 46 papers on fluid dynamics, a subdiscipline of fluid mechanics that deals with fluid flow. The topics discussed in this book include developments in interference theory for aeronautical applications; diffusion from sources in a turbulent boundary layer; unsteady motion of a finite wing span in a compressible medium; and wall pressure covariance and comparison with experiment. The certain classes of non-stationary axially symmetric flows in magneto-gas-dynamics; description of the phenomenon of secondary flows in curved channels by means of co

  19. Process Fairness and Dynamic Consistency

    NARCIS (Netherlands)

    S.T. Trautmann (Stefan); P.P. Wakker (Peter)

    2010-01-01

    textabstractAbstract: When process fairness deviates from outcome fairness, dynamic inconsistencies can arise as in nonexpected utility. Resolute choice (Machina) can restore dynamic consistency under nonexpected utility without using Strotz's precommitment. It can similarly justify dynamically

  20. Chiral Gauge Dynamics and Dynamical Supersymmetry Breaking

    Energy Technology Data Exchange (ETDEWEB)

    Poppitz, Erich; /Toronto U.; Unsal, Mithat; /SLAC /Stanford U.

    2009-05-07

    We study the dynamics of a chiral SU(2) gauge theory with a Weyl fermion in the I = 3/2 representation and of its supersymmetric generalization. In the former, we find a new and exotic mechanism of confinement, induced by topological excitations that we refer to as magnetic quintets. The supersymmetric version was examined earlier in the context of dynamical supersymmetry breaking by Intriligator, Seiberg, and Shenker, who showed that if this gauge theory confines at the origin of moduli space, one may break supersymmetry by adding a tree level superpotential. We examine the dynamics by deforming the theory on S{sup 1} x R{sup 3}, and show that the infrared behavior of this theory is an interacting CFT at small S{sup 1}. We argue that this continues to hold at large S{sup 1}, and if so, that supersymmetry must remain unbroken. Our methods also provide the microscopic origin of various superpotentials in SQCD on S{sup 1} x R{sup 3}--which were previously obtained by using symmetry and holomorphy--and resolve a long standing interpretational puzzle concerning a flux operator discovered by Affleck, Harvey, and Witten. It is generated by a topological excitation, a 'magnetic bion', whose stability is due to fermion pair exchange between its constituents. We also briefly comment on composite monopole operators as leading effects in two dimensional antiferromagnets.

  1. Assimilation Dynamic Network (ADN) Project

    Data.gov (United States)

    National Aeronautics and Space Administration — The Assimilation Dynamic Network (ADN) is a dynamic inter-processor communication network that spans heterogeneous processor architectures, unifying components,...

  2. Dynamic Boolean Mathematics

    Science.gov (United States)

    Bossé, Michael J.; Adu-Gyamfi, Kwaku; Chandler, Kayla; Lynch-Davis, Kathleen

    2016-01-01

    Dynamic mathematical environments allow users to reify mathematical concepts through multiple representations, transform mathematical relations and organically explore mathematical properties, investigate integrated mathematics, and develop conceptual understanding. Herein, we integrate Boolean algebra, the functionalities of a dynamic…

  3. Dynamic plasmonic colour display

    Science.gov (United States)

    Duan, Xiaoyang; Kamin, Simon; Liu, Na

    2017-02-01

    Plasmonic colour printing based on engineered metasurfaces has revolutionized colour display science due to its unprecedented subwavelength resolution and high-density optical data storage. However, advanced plasmonic displays with novel functionalities including dynamic multicolour printing, animations, and highly secure encryption have remained in their infancy. Here we demonstrate a dynamic plasmonic colour display technique that enables all the aforementioned functionalities using catalytic magnesium metasurfaces. Controlled hydrogenation and dehydrogenation of the constituent magnesium nanoparticles, which serve as dynamic pixels, allow for plasmonic colour printing, tuning, erasing and restoration of colour. Different dynamic pixels feature distinct colour transformation kinetics, enabling plasmonic animations. Through smart material processing, information encoded on selected pixels, which are indiscernible to both optical and scanning electron microscopies, can only be read out using hydrogen as a decoding key, suggesting a new generation of information encryption and anti-counterfeiting applications.

  4. Ansatz for dynamical hierarchies

    DEFF Research Database (Denmark)

    Rasmussen, S.; Baas, N.A.; Mayer, B.

    2001-01-01

    Complex, robust functionalities can be generated naturally in at least two ways: by the assembly of structures and by the evolution of structures. This work is concerned with spontaneous formation of structures. We define the notion of dynamical hierarchies in natural systems and show...... the importance of this particular kind of organization for living systems. We then define a framework that enables us to formulate, investigate, and manipulate such dynamical hierarchies. This framework allows us to simultaneously investigate different levels of description together with them interrelationship...... three. Formulating this system as a simple two-dimensional molecular dynamics (MD) lattice gas allows us within one dynamical system to demonstrate the successive emergence of two higher levels (three levels all together) of robust structures with associated properties. Second, we demonstrate how...

  5. The Dynamics of Standardization

    DEFF Research Database (Denmark)

    Brunsson, Nils; Rasche, Andreas; Seidl, David

    2012-01-01

    This paper suggests that when the phenomenon of standards and standardization is examined from the perspective of organization studies, three aspects stand out: the standardization of organizations, standardization by organizations and standardization as (a form of) organization. Following......, and show that, while standards and standardization are typically associated with stability and sameness, they are essentially a dynamic phenomenon. The paper highlights the contributions of this special issue to the topic of standards as a dynamic phenomenon in organization studies and makes suggestions...... a comprehensive overview of existing research in these three areas, we argue that the dynamic aspects of standardization are under-represented in the scholarly discourse. Furthermore, we identify the main types of tension associated with standardization and the dynamics they generate in each of those three areas...

  6. Transonic Dynamics Tunnel (TDT)

    Data.gov (United States)

    Federal Laboratory Consortium — The Transonic Dynamics Tunnel (TDT) is a continuous flow wind-tunnel facility capable of speeds up to Mach 1.2 at stagnation pressures up to one atmosphere. The TDT...

  7. Market Squid Population Dynamics

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This dataset contains population dynamics data on paralarvae, juvenile and adult market squid collected off California and the US Pacific Northwest. These data were...

  8. Network-behavior dynamics

    NARCIS (Netherlands)

    Veenstra, René; Dijkstra, Jan; Steglich, Christian; Van Zalk, Maarten H. W.

    2013-01-01

    Researchers have become increasingly interested in disentangling selection and influence processes. This literature review provides context for the special issue on network-behavior dynamics. It brings together important conceptual, methodological, and empirical contributions focusing on longitudina

  9. Fractional Dynamical Systems

    CERN Document Server

    Edelman, Mark

    2014-01-01

    In this paper the author presents the results of the preliminary investigation of fractional dynamical systems based on the results of numerical simulations of fractional maps. Fractional maps are equivalent to fractional differential equations describing systems experiencing periodic kicks. Their properties depend on the value of two parameters: the non-linearity parameter, which arises from the corresponding regular dynamical systems; and the memory parameter which is the order of the fractional derivative in the corresponding non-linear fractional differential equations. The examples of the fractional Standard and Logistic maps demonstrate that phase space of non-linear fractional dynamical systems may contain periodic sinks, attracting slow diverging trajectories, attracting accelerator mode trajectories, chaotic attractors, and cascade of bifurcations type trajectories whose properties are different from properties of attractors in regular dynamical systems. The author argues that discovered properties s...

  10. Gun Dynamics Laboratory

    Data.gov (United States)

    Federal Laboratory Consortium — The Gun Dynamics Laboratory is a research multi-task facility, which includes two firing bays, a high bay area and a second floor laboratory space. The high bay area...

  11. Discrete dynamical models

    CERN Document Server

    Salinelli, Ernesto

    2014-01-01

    This book provides an introduction to the analysis of discrete dynamical systems. The content is presented by an unitary approach that blends the perspective of mathematical modeling together with the ones of several discipline as Mathematical Analysis, Linear Algebra, Numerical Analysis, Systems Theory and Probability. After a preliminary discussion of several models, the main tools for the study of linear and non-linear scalar dynamical systems are presented, paying particular attention to the stability analysis. Linear difference equations are studied in detail and an elementary introduction of Z and Discrete Fourier Transform is presented. A whole chapter is devoted to the study of bifurcations and chaotic dynamics. One-step vector-valued dynamical systems are the subject of three chapters, where the reader can find the applications to positive systems, Markov chains, networks and search engines. The book is addressed mainly to students in Mathematics, Engineering, Physics, Chemistry, Biology and Economic...

  12. Invitation to dynamical systems

    CERN Document Server

    Scheinerman, Edward R

    2012-01-01

    This text is designed for those who wish to study mathematics beyond linear algebra but are unready for abstract material. Rather than a theorem-proof-corollary exposition, it stresses geometry, intuition, and dynamical systems. 1996 edition.

  13. Polymer Fluid Dynamics.

    Science.gov (United States)

    Bird, R. Byron

    1980-01-01

    Problems in polymer fluid dynamics are described, including development of constitutive equations, rheometry, kinetic theory, flow visualization, heat transfer studies, flows with phase change, two-phase flow, polymer unit operations, and drag reduction. (JN)

  14. Causal graph dynamics

    CERN Document Server

    Arrighi, Pablo

    2012-01-01

    We generalize the theory of Cellular Automata to arbitrary, time-varying graphs. In other words we formalize, and prove theorems about, the intuitive idea of a labelled graph which evolves in time - but under the natural constraint that information can only ever be transmitted at a bounded speed, with respect to the distance given by the graph. The notion of translation-invariance is also generalized. The definition we provide for these `causal graph dynamics' is simple and axiomatic. The theorems we provide also show that it is robust. For instance, causal graph dynamics are stable under composition and under restriction to radius one. In the finite case some fundamental facts of Cellular Automata theory carry through: causal graph dynamics admit a characterization as continuous functions and they are stable under inversion. The provided examples suggest a wide range of applications of this mathematical object, from complex systems science to theoretical physics. Keywords: Dynamical networks, Boolean network...

  15. Discrete Wigner function dynamics

    Energy Technology Data Exchange (ETDEWEB)

    Klimov, A B; Munoz, C [Departamento de Fisica, Universidad de Guadalajara, Revolucion 1500, 44410, Guadalajara, Jalisco (Mexico)

    2005-12-01

    We study the evolution of the discrete Wigner function for prime and the power of prime dimensions using the discrete version of the star-product operation. Exact and semiclassical dynamics in the limit of large dimensions are considered.

  16. Advances in soil dynamics

    DEFF Research Database (Denmark)

    Advances in Soil Dynamics, Volume 3, represents the culmination of the work undertaken by the Advances in Soil Dynamics Monograph Committee, PM-45-01, about 15 years ago to summarize important developments in this field over the last 35 years. When this project was initiated, the main goal...... was to abridge major strides made in the general area of soil dynamics during the sixties, seventies, and eighties. However, by about the mid-nineties soil dynamics research in the US and much of the developed world had come to a virtual standstill. Although significant progress was made prior to the mid......-nineties, we still do not have a sound fundamental knowledge of soil-machine and soil-plant interactions. It is the hope of the editors that these three volumes will provide a ready reference for much needed future research in this area....

  17. Advances in soil dynamics

    DEFF Research Database (Denmark)

    Advances in Soil Dynamics, Volume 3, represents the culmination of the work undertaken by the Advances in Soil Dynamics Monograph Committee, PM-45-01, about 15 years ago to summarize important developments in this field over the last 35 years. When this project was initiated, the main goal...... was to abridge major strides made in the general area of soil dynamics during the sixties, seventies, and eighties. However, by about the mid-nineties soil dynamics research in the US and much of the developed world had come to a virtual standstill. Although significant progress was made prior to the mid......-nineties, we still do not have a sound fundamental knowledge of soil-machine and soil-plant interactions. It is the hope of the editors that these three volumes will provide a ready reference for much needed future research in this area....

  18. ON PERIODIC DYNAMICAL SYSTEMS

    Institute of Scientific and Technical Information of China (English)

    LU WENLIAN; CHEN TIANPING

    2004-01-01

    The authors investigate the existence and the global stability of periodic solution for dynamical systems with periodic interconnections, inputs and self-inhibitions. The model is very general, the conditions are quite weak and the results obtained are universal.

  19. Stochastic dynamics and irreversibility

    CERN Document Server

    Tomé, Tânia

    2015-01-01

    This textbook presents an exposition of stochastic dynamics and irreversibility. It comprises the principles of probability theory and the stochastic dynamics in continuous spaces, described by Langevin and Fokker-Planck equations, and in discrete spaces, described by Markov chains and master equations. Special concern is given to the study of irreversibility, both in systems that evolve to equilibrium and in nonequilibrium stationary states. Attention is also given to the study of models displaying phase transitions and critical phenomema both in thermodynamic equilibrium and out of equilibrium. These models include the linear Glauber model, the Glauber-Ising model, lattice models with absorbing states such as the contact process and those used in population dynamic and spreading of epidemic, probabilistic cellular automata, reaction-diffusion processes, random sequential adsorption and dynamic percolation. A stochastic approach to chemical reaction is also presented.The textbook is intended for students of ...

  20. Supervision and group dynamics

    DEFF Research Database (Denmark)

    Hansen, Søren; Jensen, Lars Peter

    2004-01-01

    as well as at Aalborg University. The first visible result has been participating supervisors telling us that the course has inspired them to try supervising group dynamics in the future. This paper will explore some aspects of supervising group dynamics as well as, how to develop the Aalborg model...... An important aspect of the problem based and project organized study at Aalborg University is the supervision of the project groups. At the basic education (first year) it is stated in the curriculum that part of the supervisors' job is to deal with group dynamics. This is due to the experience...... that many students are having difficulties with practical issues such as collaboration, communication, and project management. Most supervisors either ignore this demand, because they do not find it important or they find it frustrating, because they do not know, how to supervise group dynamics...

  1. Nonequilibrium molecular dynamics

    Energy Technology Data Exchange (ETDEWEB)

    Hoover, W.G. (California Univ., Davis, CA (USA). Dept. of Applied Science Lawrence Livermore National Lab., CA (USA))

    1990-11-01

    The development of nonequilibrium molecular dynamics is described, with emphasis on massively-parallel simulations involving the motion of millions, soon to be billions, of atoms. Corresponding continuum simulations are also discussed. 14 refs., 8 figs.

  2. Dynamic Stage Design

    Institute of Scientific and Technical Information of China (English)

    Florian von Hofen[GER

    2013-01-01

    Concepts and methods for dynamic stage designs were introduced ranging from different ifelds of TV live shows, exhibitions and theatre performances, and a special emphasis was put on solution to the theatre stage design.

  3. Dynamic performance management system

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    An integrated, efficient and effective performance management system, "dynamic performance management system", is presented, which covers the entire performance management process including measures design, analysis, and dynamic update. The analysis of performance measures using causal loop diagrams, qualitative inference and analytic network process is mainly discussed. A real world case study is carried out throughout the paper to explain how the framework works. A software tool for DPMS, Performance Analyzer, is also introduced.

  4. Photochemical reaction dynamics

    Energy Technology Data Exchange (ETDEWEB)

    Moore, B.C. [Lawrence Berkeley Laboratory, Livermore, CA (United States)

    1993-12-01

    The purpose of the program is to develop a fundamental understanding of unimolecular and bimolecular reaction dynamics with application in combustion and energy systems. The energy dependence in ketene isomerization, ketene dissociation dynamics, and carbonyl substitution on organometallic rhodium complexes in liquid xenon have been studied. Future studies concerning unimolecular processes in ketene as well as energy transfer and kinetic studies of methylene radicals are discussed.

  5. Dynamics in artifact ecologies

    DEFF Research Database (Denmark)

    Bødker, Susanne; Klokmose, Clemens Nylandsted

    2012-01-01

    We increasingly interact with multiple interactive artifacts with overlapping capabilities during our daily activities. It has previously been shown that the use of an interactive artifact cannot be understood in isolation, but artifacts must be understood as part of an artifact ecology, where ar...... in artifact ecologies cannot be understood as static, instead they evolve dynamically over time. We provide activity theory-based concepts to explain these dynamics....

  6. Dynamics of curved fronts

    CERN Document Server

    Pelce, Pierre

    1989-01-01

    In recent years, much progress has been made in the understanding of interface dynamics of various systems: hydrodynamics, crystal growth, chemical reactions, and combustion. Dynamics of Curved Fronts is an important contribution to this field and will be an indispensable reference work for researchers and graduate students in physics, applied mathematics, and chemical engineering. The book consist of a 100 page introduction by the editor and 33 seminal articles from various disciplines.

  7. Dynamics of Soft Matter

    CERN Document Server

    García Sakai, Victoria; Chen, Sow-Hsin

    2012-01-01

    Dynamics of Soft Matter: Neutron Applications provides an overview of neutron scattering techniques that measure temporal and spatial correlations simultaneously, at the microscopic and/or mesoscopic scale. These techniques offer answers to new questions arising at the interface of physics, chemistry, and biology. Knowledge of the dynamics at these levels is crucial to understanding the soft matter field, which includes colloids, polymers, membranes, biological macromolecules, foams, emulsions towards biological & biomimetic systems, and phenomena involving wetting, friction, adhesion, or micr

  8. Dynamically Generated $\\Xi (1690)$

    CERN Document Server

    Sekihara, Takayasu

    2016-01-01

    We show that the $\\Xi (1690)$ resonance can be dynamically generated in the $s$-wave $\\bar{K} \\Sigma$-$\\bar{K} \\Lambda$-$\\pi \\Xi$-$\\eta \\Xi$ coupled-channels chiral unitary approach. In our model, the $\\Xi (1690)$ resonance appears near the $\\bar{K} \\Sigma$ threshold as a $\\bar{K} \\Sigma$ molecular state and the experimental data are reproduced well. We discuss properties of the dynamically generated $\\Xi (1690)$.

  9. Nonuniversality in level dynamics

    CERN Document Server

    Kunstman, P; Zakrzewski, J A; Kunstman, Pawe{\\l}; Zyczkowski, Karol \\.; Zakrzewski, Jakub

    1997-01-01

    Statistical properties of parametric motion in ensembles of Hermitian banded random matrices are studied. We analyze the distribution of level velocities and level curvatures as well as their correlation functions in the crossover regime between three universality classes. It is shown that the statistical properties of level dynamics are in general non-universal and strongly depend on the way in which the parametric dynamics is introduced.

  10. Nonuniversality in level dynamics

    Energy Technology Data Exchange (ETDEWEB)

    Kunstman, P.; Zyczkowski, K.; Zakrzewski, J. [Instytut Fizyki Mariana Smoluchowskiego, Uniwersytet Jagiellonski, ulica Reymonta 4, 30-059 Krakow (Poland)

    1997-03-01

    Statistical properties of parametric motion in ensembles of Hermitian banded random matrices are studied. We analyze the distribution of level velocities and level curvatures as well as their correlation functions in the crossover regime between three universality classes. It is shown that the statistical properties of level dynamics are in general {ital nonuniversal} and strongly depend on the way in which the parametric dynamics is introduced. {copyright} {ital 1997} {ital The American Physical Society}

  11. Ocean Dynamics: Dynamo

    Science.gov (United States)

    2012-09-30

    1 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Ocean Dynamics: Dynamo Robert Pinkel Marine Physical...execution of the Dynamo Leg IV Experiment in December 2011. Our objective was to document the development of the diurnal surface layer and its...2. REPORT TYPE N/A 3. DATES COVERED - 4. TITLE AND SUBTITLE Ocean Dynamics: Dynamo 5a. CONTRACT NUMBER 5b. GRANT NUMBER 5c. PROGRAM

  12. Chaotic dynamics with Maxima

    OpenAIRE

    2013-01-01

    We present an introduction to the study of chaos in discrete and continuous dynamical systems using the CAS Maxima. These notes are intended to cover the standard topics and techniques: discrete and continuous logistic equation to model growth population, staircase plots, bifurcation diagrams and chaos transition, nonlinear continuous dynamics (Lorentz system and Duffing oscillator), Lyapunov exponents, Poincar\\'e sections, fractal dimension and strange attractors. The distinctive feature her...

  13. Ocean Dynamics: Vietnam DRI

    Science.gov (United States)

    2014-09-30

    Dynamics: Vietnam DRI Robert Pinkel Marine Physical Laboratory Scripps Institution of Oceanography La Jolla California 92093-0213 Phone: (858) 534...DATES COVERED 00-00-2014 to 00-00-2014 4. TITLE AND SUBTITLE Ocean Dynamics: Vietnam DRI 5a. CONTRACT NUMBER 5b. GRANT NUMBER 5c. PROGRAM...cycle.. The Thorpe-scale estimates are local to Site III. South China Sea Process Cruise 2014 Under Vietnam DRI funding, Researcher Drew Lucas

  14. Dynamical quantum teleportation

    Energy Technology Data Exchange (ETDEWEB)

    Muschik, Christine [ICFO-Institut de Ciencies Fotoniques (Spain); Polzik, Eugene [Niels Bohr Institute (Denmark); Cirac, Ignacio [Max-Planck-Institute (Germany)

    2013-07-01

    We introduce two protocols for inducing non-local dynamics between two separate parties. The first scheme allows for the engineering of an interaction between the two remote systems, while the second protocol induces a dynamics in one of the parties, which is controlled by the other one. Both schemes apply to continuous variable systems, run continuously in time and are based on instantaneous feedback.

  15. Assimilating seizure dynamics.

    Directory of Open Access Journals (Sweden)

    Ghanim Ullah

    2010-05-01

    Full Text Available Observability of a dynamical system requires an understanding of its state-the collective values of its variables. However, existing techniques are too limited to measure all but a small fraction of the physical variables and parameters of neuronal networks. We constructed models of the biophysical properties of neuronal membrane, synaptic, and microenvironment dynamics, and incorporated them into a model-based predictor-controller framework from modern control theory. We demonstrate that it is now possible to meaningfully estimate the dynamics of small neuronal networks using as few as a single measured variable. Specifically, we assimilate noisy membrane potential measurements from individual hippocampal neurons to reconstruct the dynamics of networks of these cells, their extracellular microenvironment, and the activities of different neuronal types during seizures. We use reconstruction to account for unmeasured parts of the neuronal system, relating micro-domain metabolic processes to cellular excitability, and validate the reconstruction of cellular dynamical interactions against actual measurements. Data assimilation, the fusing of measurement with computational models, has significant potential to improve the way we observe and understand brain dynamics.

  16. Dynamic hardness of metals

    Science.gov (United States)

    Liang, Xuecheng

    Dynamic hardness (Pd) of 22 different pure metals and alloys having a wide range of elastic modulus, static hardness, and crystal structure were measured in a gas pulse system. The indentation contact diameter with an indenting sphere and the radius (r2) of curvature of the indentation were determined by the curve fitting of the indentation profile data. r 2 measured by the profilometer was compared with that calculated from Hertz equation in both dynamic and static conditions. The results indicated that the curvature change due to elastic recovery after unloading is approximately proportional to the parameters predicted by Hertz equation. However, r 2 is less than the radius of indenting sphere in many cases which is contradictory to Hertz analysis. This discrepancy is believed due to the difference between Hertzian and actual stress distributions underneath the indentation. Factors which influence indentation elastic recovery were also discussed. It was found that Tabor dynamic hardness formula always gives a lower value than that directly from dynamic hardness definition DeltaE/V because of errors mainly from Tabor's rebound equation and the assumption that dynamic hardness at the beginning of rebound process (Pr) is equal to kinetic energy change of an impact sphere over the formed crater volume (Pd) in the derivation process for Tabor's dynamic hardness formula. Experimental results also suggested that dynamic to static hardness ratio of a material is primarily determined by its crystal structure and static hardness. The effects of strain rate and temperature rise on this ratio were discussed. A vacuum rotating arm apparatus was built to measure Pd at 70, 127, and 381 mum sphere sizes, these results exhibited that Pd is highly depended on the sphere size due to the strain rate effects. P d was also used to substitute for static hardness to correlate with abrasion and erosion resistance of metals and alloys. The particle size effects observed in erosion were

  17. A HYBRID DYNAMIC PROGRAM SLICING

    Institute of Scientific and Technical Information of China (English)

    Yi Tong; Wu Fangjun

    2005-01-01

    This letter proposes a hybrid method for computing dynamic program slicing. The key element is to construct a Coverage-Testing-based Dynamic Dependence Graph (CTDDG),which makes use of both dynamic and static information to get execution status. The approach overcomes the limitations of previous dynamic slicing methods, which have to redo slicing if slice criterion changes.

  18. Dynamics in Epistasis Analysis.

    Science.gov (United States)

    Awdeh, Aseel; Phenix, Hilary; Kaern, Mads; Perkins, Theodore

    2017-01-16

    Finding regulatory relationships between genes, including the direction and nature of influence between them, is a fundamental challenge in the field of molecular genetics. One classical approach to this problem is epistasis analysis. Broadly speaking, epistasis analysis infers the regulatory relationships between a pair of genes in a genetic pathway by considering the patterns of change in an observable trait resulting from single and double deletion of genes. While classical epistasis analysis has yielded deep insights on numerous genetic pathways, it is not without limitations. Here, we explore the possibility of dynamic epistasis analysis, in which, in addition to performing genetic perturbations of a pathway, we drive the pathway by a time-varying upstream signal. We explore the theoretical power of dynamical epistasis analysis by conducting an identifiability analysis of Boolean models of genetic pathways, comparing static and dynamic approaches. We find that even relatively simple input dynamics greatly increases the power of epistasis analysis to discriminate alternative network structures. Further, we explore the question of experiment design, and show that a subset of short time-varying signals, which we call dynamic primitives, allow maximum discriminative power with a reduced number of experiments.

  19. Astrophysical fluid dynamics

    Science.gov (United States)

    Ogilvie, Gordon I.

    2016-06-01

    > These lecture notes and example problems are based on a course given at the University of Cambridge in Part III of the Mathematical Tripos. Fluid dynamics is involved in a very wide range of astrophysical phenomena, such as the formation and internal dynamics of stars and giant planets, the workings of jets and accretion discs around stars and black holes and the dynamics of the expanding Universe. Effects that can be important in astrophysical fluids include compressibility, self-gravitation and the dynamical influence of the magnetic field that is `frozen in' to a highly conducting plasma. The basic models introduced and applied in this course are Newtonian gas dynamics and magnetohydrodynamics (MHD) for an ideal compressible fluid. The mathematical structure of the governing equations and the associated conservation laws are explored in some detail because of their importance for both analytical and numerical methods of solution, as well as for physical interpretation. Linear and nonlinear waves, including shocks and other discontinuities, are discussed. The spherical blast wave resulting from a supernova, and involving a strong shock, is a classic problem that can be solved analytically. Steady solutions with spherical or axial symmetry reveal the physics of winds and jets from stars and discs. The linearized equations determine the oscillation modes of astrophysical bodies, as well as their stability and their response to tidal forcing.

  20. Semipredictable dynamical systems

    Science.gov (United States)

    García-Morales, Vladimir

    2016-10-01

    A new class of deterministic dynamical systems, termed semipredictable dynamical systems, is presented. The spatiotemporal evolution of these systems have both predictable and unpredictable traits, as found in natural complex systems. We prove a general result: The dynamics of any deterministic nonlinear cellular automaton (CA) with p possible dynamical states can be decomposed at each instant of time in a superposition of N layers involving p0, p1, …, pN - 1 dynamical states each, where the pk ∈ N , k ∈ [ 0 , N - 1 ] are divisors of p. If the divisors coincide with the prime factors of p this decomposition is unique. Conversely, we also prove that N CA working on symbols p0, p1, …, pN - 1 can be composed to create a graded CA rule with N different layers. We then show that, even when the full spatiotemporal evolution can be unpredictable, certain traits (layers) can exactly be predicted. We present explicit examples of such systems involving compositions of Wolfram's 256 elementary CA and a more complex CA rule acting on a neighborhood of two sites and 12 symbols and whose rule table corresponds to the smallest Moufang loop M12(S3, 2).

  1. Modeling dynamic swarms

    KAUST Repository

    Ghanem, Bernard

    2013-01-01

    This paper proposes the problem of modeling video sequences of dynamic swarms (DSs). We define a DS as a large layout of stochastically repetitive spatial configurations of dynamic objects (swarm elements) whose motions exhibit local spatiotemporal interdependency and stationarity, i.e., the motions are similar in any small spatiotemporal neighborhood. Examples of DS abound in nature, e.g., herds of animals and flocks of birds. To capture the local spatiotemporal properties of the DS, we present a probabilistic model that learns both the spatial layout of swarm elements (based on low-level image segmentation) and their joint dynamics that are modeled as linear transformations. To this end, a spatiotemporal neighborhood is associated with each swarm element, in which local stationarity is enforced both spatially and temporally. We assume that the prior on the swarm dynamics is distributed according to an MRF in both space and time. Embedding this model in a MAP framework, we iterate between learning the spatial layout of the swarm and its dynamics. We learn the swarm transformations using ICM, which iterates between estimating these transformations and updating their distribution in the spatiotemporal neighborhoods. We demonstrate the validity of our method by conducting experiments on real and synthetic video sequences. Real sequences of birds, geese, robot swarms, and pedestrians evaluate the applicability of our model to real world data. © 2012 Elsevier Inc. All rights reserved.

  2. Dynamic stiffness of suction caissons

    DEFF Research Database (Denmark)

    Ibsen, Lars Bo; Liingaard, Morten; Andersen, Lars

    The purpose of this report is to evaluate the dynamic soil-structure interaction of suction caissons for offshore wind turbines. The investigation is limited to a determination of the vertical dynamic stiffness of suction caissons. The soil surrounding the foundation is homogenous with linear...... of the skirt length, Poisson's ratio and the ratio between soil stiffness and skirt stiffness. Finally the dynamic behaviour at high frequencies is investigated....... viscoelastic properties. The dynamic stiffness of the suction caisson is expressed by dimensionless frequency-dependent dynamic stiffness coefficients corresponding to the vertical degree of freedom. The dynamic stiffness coefficients for the foundations are evaluated by means of a dynamic three...

  3. System dynamics with interaction discontinuity

    CERN Document Server

    Luo, Albert C J

    2015-01-01

    This book describes system dynamics with discontinuity caused by system interactions and presents the theory of flow singularity and switchability at the boundary in discontinuous dynamical systems. Based on such a theory, the authors address dynamics and motion mechanism of engineering discontinuous systems due to interaction. Stability and bifurcations of fixed points in nonlinear discrete dynamical systems are presented, and mapping dynamics are developed for analytical predictions of periodic motions in engineering discontinuous dynamical systems. Ultimately, the book provides an alternative way to discuss the periodic and chaotic behaviors in discontinuous dynamical systems.

  4. Vehicle dynamics theory and application

    CERN Document Server

    Jazar, Reza N

    2017-01-01

    This intermediate textbook is appropriate for students in vehicle dynamics courses, in their last year of undergraduate study or their first year of graduate study. It is also appropriate for mechanical engineers, automotive engineers, and researchers in the area of vehicle dynamics for continuing education or as a reference. It addresses fundamental and advanced topics, and a basic knowledge of kinematics and dynamics, as well as numerical methods, is expected. The contents are kept at a theoretical-practical level, with a strong emphasis on application. This third edition has been reduced by 25%, to allow for coverage over one semester, as opposed to the previous edition that needed two semesters for coverage. The textbook is composed of four parts: Vehicle Motion: covers tire dynamics, forward vehicle dynamics, and driveline dynamics Vehicle Kinematics: covers applied kinematics, applied mechanisms, steering dynamics, and suspension mechanisms Vehicle Dynamics: covers applied dynamics, vehicle planar dynam...

  5. Conference on Multibody Dynamics

    CERN Document Server

    Multibody Dynamics : Computational Methods and Applications

    2014-01-01

    By having its origin in analytical and continuum mechanics, as well as in computer science and applied mathematics, multibody dynamics provides a basis for analysis and virtual prototyping of innovative applications in many fields of contemporary engineering. With the utilization of computational models and algorithms that classically belonged to different fields of applied science, multibody dynamics delivers reliable simulation platforms for diverse highly-developed industrial products such as vehicle and railway systems, aeronautical and space vehicles, robotic manipulators, smart structures, biomechanical applications and nano-technologies. The chapters of this volume are based on the revised and extended versions of the selected scientific papers from amongst 255 original contributions that have been accepted to be presented within the program of the distinguished international ECCOMAS conference. It reflects state-of-the-art in the advances of multibody dynamics, providing excellent insight in the recen...

  6. Fractional Dynamics and Control

    CERN Document Server

    Machado, José; Luo, Albert

    2012-01-01

    Fractional Dynamics and Control provides a comprehensive overview of recent advances in the areas of nonlinear dynamics, vibration and control with analytical, numerical, and experimental results. This book provides an overview of recent discoveries in fractional control, delves into fractional variational principles and differential equations, and applies advanced techniques in fractional calculus to solving complicated mathematical and physical problems.Finally, this book also discusses the role that fractional order modeling can play in complex systems for engineering and science. Discusses how fractional dynamics and control can be used to solve nonlinear science and complexity issues Shows how fractional differential equations and models can be used to solve turbulence and wave equations in mechanics and gravity theories and Schrodinger’s equation  Presents factional relaxation modeling of dielectric materials and wave equations for dielectrics  Develops new methods for control and synchronization of...

  7. Complex dynamics in nanosystems.

    Science.gov (United States)

    Ni, Xuan; Ying, Lei; Lai, Ying-Cheng; Do, Younghae; Grebogi, Celso

    2013-05-01

    Complex dynamics associated with multistability have been studied extensively in the past but mostly for low-dimensional nonlinear dynamical systems. A question of fundamental interest is whether multistability can arise in high-dimensional physical systems. Motivated by the ever increasing widespread use of nanoscale systems, we investigate a prototypical class of nanoelectromechanical systems: electrostatically driven Si nanowires, mathematically described by a set of driven, nonlinear partial differential equations. We develop a computationally efficient algorithm to solve the equations. Our finding is that multistability and complicated structures of basins of attraction are common types of dynamics, and the latter can be attributed to extensive transient chaos. Implications of these phenomena to device operations are discussed.

  8. Dynamical laser spike processing

    CERN Document Server

    Shastri, Bhavin J; Tait, Alexander N; Rodriguez, Alejandro W; Wu, Ben; Prucnal, Paul R

    2015-01-01

    Novel materials and devices in photonics have the potential to revolutionize optical information processing, beyond conventional binary-logic approaches. Laser systems offer a rich repertoire of useful dynamical behaviors, including the excitable dynamics also found in the time-resolved "spiking" of neurons. Spiking reconciles the expressiveness and efficiency of analog processing with the robustness and scalability of digital processing. We demonstrate that graphene-coupled laser systems offer a unified low-level spike optical processing paradigm that goes well beyond previously studied laser dynamics. We show that this platform can simultaneously exhibit logic-level restoration, cascadability and input-output isolation---fundamental challenges in optical information processing. We also implement low-level spike-processing tasks that are critical for higher level processing: temporal pattern detection and stable recurrent memory. We study these properties in the context of a fiber laser system, but the addit...

  9. Dynamics of Paroxysmal Tachycardia

    Science.gov (United States)

    Glass, Leon

    2004-03-01

    Parosxysmal tachycardia refers to abnormally fast cardiac arrhythmias that suddenly start and stop. Paroxysmal tachycardias can occur in many regions of the heart and may be associated with many different mechanisms. In order to study paroxysmal tachycardias, we have analyzed tissue cultures of cells from embryonic chick heart that are imaged using calcium and voltage sensitive dyes. This model system displays a number of different types of dynamics including dynamics originating from pacemakers, triggered dynamics in which an excitation leads to the initiation of a sequence of waves originating from a single source, and spontaneously iniitiating and terminating rotating spiral waves. Theoretical models that include heterogeneity, spontaneous pacemaker activity, and fatigue or reduced excitability arising as a consequence of rapid excitation can be used to account for these behaviors.

  10. Dynamics of aerospace vehicles

    Science.gov (United States)

    Schmidt, David K.

    1991-01-01

    The focus of this research was to address the modeling, including model reduction, of flexible aerospace vehicles, with special emphasis on models used in dynamic analysis and/or guidance and control system design. In the modeling, it is critical that the key aspects of the system being modeled be captured in the model. In this work, therefore, aspects of the vehicle dynamics critical to control design were important. In this regard, fundamental contributions were made in the areas of stability robustness analysis techniques, model reduction techniques, and literal approximations for key dynamic characteristics of flexible vehicles. All these areas are related. In the development of a model, approximations are always involved, so control systems designed using these models must be robust against uncertainties in these models.

  11. Dynamic Data Structures

    DEFF Research Database (Denmark)

    Tsakalidis, Konstantinos

    We study dynamic data structures for different variants of orthogonal range reporting query problems. In particular, we consider (1) the planar orthogonal 3-sided range reporting problem: given a set of points in the plane, report the points that lie within a given 3-sided rectangle with one....... Dynamic problems like the above arise in various applications of network optimization, VLSI layout design, computer graphics and distributed computing. For the first problem, we present dynamic data structures for internal and external memory that support planar orthogonal 3-sided range reporting queries......, and insertions and deletions of points efficiently over an average case sequence of update operations. The external memory data structures find applications in constraint and temporal databases. In particular, we assume that the coordinates of the points are drawn from different probabilistic distributions...

  12. Safe Dynamic Multiple Inheritance

    DEFF Research Database (Denmark)

    Ernst, Erik

    2002-01-01

    Multiple inheritance and similar mechanisms are usually only supported at compile time in statically typed languages. Nevertheless, dynamic multiple inheritance would be very useful in the development of complex systems, because it allows the creation of many related classes without an explosion...... in the size and level of redundancy in the source code. In fact, dynamic multiple inheritance is already available. The language gbeta is statically typed and has supported run-time combination of classes and methods since 1997, by means of the combination operator '&'. However, with certain combinations...... of operands the '&' operator fails; as a result, dynamic creation of new classes and methods was considered a dangerous operation in all cases. This paper presents a large and useful category of combinations, and proves that combinations in this category will always succeed....

  13. Introduction to dynamics

    CERN Document Server

    Pfeiffer, Friedrich

    2015-01-01

    This concise textbook for students preferably of a postgraduate level, but also for engineers in practice, contains the basic kinematical and kinetic structures of dynamics together with carefully selected applications. The book is a condensed introduction to the fundamental laws of kinematics and kinetics, on the most important principles of mechanics and presents the equations of motion in the form of Lagrange and Newton-Euler. Selected problems of linear and nonlinear dynamics are treated, as well as problems of vibration formation. The presented selection of topics gives a useful basis for stepping into more advanced problems of dynamics. The contents of this book represent the result of a regularly revised course, which has been and still is given for masters students at the Technische Universität München. .

  14. Flight Dynamics Laboratory overview

    Science.gov (United States)

    Sandford, Thaddeus

    1986-01-01

    The Flight Dynamics Laboratory (FDL) is one of four Air Force Wright Aeronautical Laboratories (AFWAL) and part of the Aeronautical Systems Division located at Wright-Patterson AFB, Ohio. The FDL is responsible for the planning and execution of research and development programs in the areas of structures and dynamics, flight controls, vehicle equipment/subsystems, and aeromechanics. Some of the areas being researched in the four FDL divisions are as follows: large space structures (LSS) materials and controls; advanced cockpit designs; bird-strike-tolerant windshields; and hypersonic interceptor system studies. Two of the FDL divisions are actively involved in programs that deal directly with LSS control/structures interaction: the Flight Controls Division and the Structures and Dynamics Division.

  15. Dynamics of Immobilized Flagella

    CERN Document Server

    Fry, D; Ludu, A

    2003-01-01

    Although the auger-like 'swimming' motility of the African trypanosome was described upon its discovery over one hundred years ago, the precise biomechanical and biophysical properties of trypanosome flagellar motion has not been elucidated. In this study, we describe five different modes of flagellar beat/wave patterns in African trypanosomes by microscopically examining the flagellar movements of chemically tethered cells. The dynamic nature of the different beat/wave patterns suggests that flagellar motion in Trypanosoma brucei is a complex mixture of oscillating waves, rigid bends, helical twists and non-linear waves. Interestingly, we have observed soliton-like depression waves along the flagellar membrane, suggesting a nonlinear mechanism for the dynamics of this system. The physical model is inspired by the 2-dimensional elastic dynamics of a beam, and by taking into account uniform distribution of molecular motors torque and nonlinear terms in the curvature.

  16. Dynamics in geometrical confinement

    CERN Document Server

    Kremer, Friedrich

    2014-01-01

    This book describes the dynamics of low molecular weight and polymeric molecules when they are constrained under conditions of geometrical confinement. It covers geometrical confinement in different dimensionalities: (i) in nanometer thin layers or self supporting films (1-dimensional confinement) (ii) in pores or tubes with nanometric diameters (2-dimensional confinement) (iii) as micelles embedded in matrices (3-dimensional) or as nanodroplets.The dynamics under such conditions have been a much discussed and central topic in the focus of intense worldwide research activities within the last two decades. The present book discusses how the resulting molecular mobility is influenced by the subtle counterbalance between surface effects (typically slowing down molecular dynamics through attractive guest/host interactions) and confinement effects (typically increasing the mobility). It also explains how these influences can be modified and tuned, e.g. through appropriate surface coatings, film thicknesses or pore...

  17. Dynamic Data Structures

    DEFF Research Database (Denmark)

    Tsakalidis, Konstantinos

    We study dynamic data structures for different variants of orthogonal range reporting query problems. In particular, we consider (1) the planar orthogonal 3-sided range reporting problem: given a set of points in the plane, report the points that lie within a given 3-sided rectangle with one....... Dynamic problems like the above arise in various applications of network optimization, VLSI layout design, computer graphics and distributed computing. For the first problem, we present dynamic data structures for internal and external memory that support planar orthogonal 3-sided range reporting queries...... unbounded side, (2) the planar orthogonal range maxima reporting problem: given a set of points in the plane, report the points that lie within a given orthogonal range and are not dominated by any other point in the range, and (3) the problem of designing fully persistent B-trees for external memory...

  18. Fundamental composite electroweak dynamics

    DEFF Research Database (Denmark)

    Arbey, Alexandre; Cacciapaglia, Giacomo; Cai, Haiying

    2017-01-01

    Using the recent joint results from the ATLAS and CMS collaborations on the Higgs boson, we determine the current status of composite electroweak dynamics models based on the expected scalar sector. Our analysis can be used as a minimal template for a wider class of models between the two limiting...... cases of composite Goldstone Higgs and Technicolor-like ones. This is possible due to the existence of a unified description, both at the effective and fundamental Lagrangian levels, of models of composite Higgs dynamics where the Higgs boson itself can emerge, depending on the way the electroweak...... space at the effective Lagrangian level. We show that a wide class of models of fundamental composite electroweak dynamics are still compatible with the present constraints. The results are relevant for the ongoing and future searches at the Large Hadron Collider....

  19. Effect of Conductor Verbalization, Dynamic Markings, Conductor Gesture, and Choir Dynamic Level on Singers' Dynamic Responses.

    Science.gov (United States)

    Skadsem, Julie A.

    1997-01-01

    Examines the effects of conductor verbalization, dynamic markings, conductor gesture, and choir dynamic level on individual singers' dynamic responses. Indicates that verbal instructions from the conductor elicited significantly stronger dynamic performance responses than did the other instructional conditions. Suggests that additional research…

  20. Principles of dynamics

    CERN Document Server

    Hill, Rodney

    2013-01-01

    Principles of Dynamics presents classical dynamics primarily as an exemplar of scientific theory and method. This book is divided into three major parts concerned with gravitational theory of planetary systems; general principles of the foundations of mechanics; and general motion of a rigid body. Some of the specific topics covered are Keplerian Laws of Planetary Motion; gravitational potential and potential energy; and fields of axisymmetric bodies. The principles of work and energy, fictitious body-forces, and inertial mass are also looked into. Other specific topics examined are kinematics

  1. Dynamics of structures

    CERN Document Server

    Paultre, Patrick

    2013-01-01

    This book covers structural dynamics from a theoretical and algorithmic approach. It covers systems with both single and multiple degrees-of-freedom. Numerous case studies are given to provide the reader with a deeper insight into the practicalities of the area, and the solutions to these case studies are given in terms of real-time and frequency in both geometric and modal spaces. Emphasis is also given to the subject of seismic loading. The text is based on many lectures on the subject of structural dynamics given at numerous institutions and thus will be an accessible and practical aid to

  2. Computational fluid dynamics

    CERN Document Server

    Blazek, Jiri

    2015-01-01

    Computational Fluid Dynamics: Principles and Applications, Third Edition presents students, engineers, and scientists with all they need to gain a solid understanding of the numerical methods and principles underlying modern computation techniques in fluid dynamics. By providing complete coverage of the essential knowledge required in order to write codes or understand commercial codes, the book gives the reader an overview of fundamentals and solution strategies in the early chapters before moving on to cover the details of different solution techniques. This updated edition includes new

  3. Partial Dynamical Symmetries

    CERN Document Server

    Leviatan, A

    2010-01-01

    This overview focuses on the notion of partial dynamical symmetry (PDS), for which a prescribed symmetry is obeyed by a subset of solvable eigenstates, but is not shared by the Hamiltonian. General algorithms are presented to identify interactions, of a given order, with such intermediate-symmetry structure. Explicit bosonic and fermionic Hamiltonians with PDS are constructed in the framework of models based on spectrum generating algebras. PDSs of various types are shown to be relevant to nuclear spectroscopy, quantum phase transitions and systems with mixed chaotic and regular dynamics.

  4. Statistics of football dynamics

    CERN Document Server

    Mendes, R S; Anteneodo, C

    2007-01-01

    We investigate the dynamics of football matches. Our goal is to characterize statistically the temporal sequence of ball movements in this collective sport game, searching for traits of complex behavior. Data were collected over a variety of matches in South American, European and World championships throughout 2005 and 2006. We show that the statistics of ball touches presents power-law tails and can be described by $q$-gamma distributions. To explain such behavior we propose a model that provides information on the characteristics of football dynamics. Furthermore, we discuss the statistics of duration of out-of-play intervals, not directly related to the previous scenario.

  5. Gas Dynamics Equations: Computation

    CERN Document Server

    Chen, Gui-Qiang G

    2012-01-01

    Shock waves, vorticity waves, and entropy waves are fundamental discontinuity waves in nature and arise in supersonic or transonic gas flow, or from a very sudden release (explosion) of chemical, nuclear, electrical, radiation, or mechanical energy in a limited space. Tracking these discontinuities and their interactions, especially when and where new waves arise and interact in the motion of gases, is one of the main motivations for numerical computation for the gas dynamics equations. In this paper, we discuss some historic and recent developments, as well as mathematical challenges, in designing and formulating efficient numerical methods and algorithms to compute weak entropy solutions for the Euler equations for gas dynamics.

  6. Substructured multibody molecular dynamics.

    Energy Technology Data Exchange (ETDEWEB)

    Grest, Gary Stephen; Stevens, Mark Jackson; Plimpton, Steven James; Woolf, Thomas B. (Johns Hopkins University, Baltimore, MD); Lehoucq, Richard B.; Crozier, Paul Stewart; Ismail, Ahmed E.; Mukherjee, Rudranarayan M. (Rensselaer Polytechnic Institute, Troy, NY); Draganescu, Andrei I.

    2006-11-01

    We have enhanced our parallel molecular dynamics (MD) simulation software LAMMPS (Large-scale Atomic/Molecular Massively Parallel Simulator, lammps.sandia.gov) to include many new features for accelerated simulation including articulated rigid body dynamics via coupling to the Rensselaer Polytechnic Institute code POEMS (Parallelizable Open-source Efficient Multibody Software). We use new features of the LAMMPS software package to investigate rhodopsin photoisomerization, and water model surface tension and capillary waves at the vapor-liquid interface. Finally, we motivate the recipes of MD for practitioners and researchers in numerical analysis and computational mechanics.

  7. Dynamical Structure of Baryons

    CERN Document Server

    Aleksejevs, A

    2013-01-01

    Compton scattering offers a unique opportunity to study the dynamical structure of hadrons over a wide kinematic range, with polarizabilities characterizing the hadron active internal degrees of freedom. We present calculations and detailed analysis of electric and magnetic and the spin-dependent dynamical polarizabilities for the lowest in mass SU(3) octet of baryons. These extensive calculations are made possible by the recent implementation of semi-automatized calculations in chiral perturbation theory which allows evaluating polarizabilities from Compton scattering up to next-to-the-leading order. The dependencies for the range of photon energies covering the majority of the meson photoproduction channels are analyzed.

  8. Dynamically assisted Schwinger mechanism.

    Science.gov (United States)

    Schützhold, Ralf; Gies, Holger; Dunne, Gerald

    2008-09-26

    We study electron-positron pair creation from the Dirac vacuum induced by a strong and slowly varying electric field (Schwinger effect) which is superimposed by a weak and rapidly changing electromagnetic field (dynamical pair creation). In the subcritical regime where both mechanisms separately are strongly suppressed, their combined impact yields a pair creation rate which is dramatically enhanced. Intuitively speaking, the strong electric field lowers the threshold for dynamical particle creation--or, alternatively, the fast electromagnetic field generates additional seeds for the Schwinger mechanism. These findings could be relevant for planned ultrahigh intensity lasers.

  9. Dynamical angled brane

    Science.gov (United States)

    Maeda, Kei-ichi; Uzawa, Kunihito

    2016-12-01

    We discuss the dynamical D p -brane solutions describing any number of D p branes whose relative orientations are given by certain SU(2) rotations. These are the generalization of the static angled D p -brane solutions. We study the collision of the dynamical D3 brane with angles in type-II string theory, and show that the particular orientation of the smeared D3-brane configuration can provide an example of colliding branes if they have the same charges. Otherwise a singularity appears before D3 branes collide.

  10. Introduction to cluster dynamics

    CERN Document Server

    Reinhard, Paul-Gerhard

    2008-01-01

    Clusters as mesoscopic particles represent an intermediate state of matter between single atoms and solid material. The tendency to miniaturise technical objects requires knowledge about systems which contain a ""small"" number of atoms or molecules only. This is all the more true for dynamical aspects, particularly in relation to the qick development of laser technology and femtosecond spectroscopy. Here, for the first time is a highly qualitative introduction to cluster physics. With its emphasis on cluster dynamics, this will be vital to everyone involved in this interdisciplinary subje

  11. Dynamic Global Currency Hedging

    DEFF Research Database (Denmark)

    Christensen, Bent Jesper; Varneskov, Rasmus T.

    2016-01-01

    This paper proposes a model for discrete-time hedging based on continuous-time movements in portfolio and foreign currency exchange rate returns. In particular, the vector of optimal currency exposures is shown to be given by the negative realized regression coefficients from a one......-period conditional expectation of the intra-period quadratic covariation matrix for portfolio and foreign exchange rate returns. These are labelled the realized currency betas. The model, hence, facilitates dynamic hedging strategies that depend exclusively on the dynamic evolution of the ex-post quadratic...

  12. Dynamics of Catalyst Nanoparticles

    DEFF Research Database (Denmark)

    Hansen, Thomas Willum; Cavalca, Filippo; Wagner, Jakob Birkedal

    under gas exposure, dynamic phenomena such as sintering and growth can be observed with sub-Ångstrøm resolution. Metal nanoparticles contain the active sites in heterogeneous catalysts, which are important for many industrial applications including the production of clean fuels, chemicals...... and pharmaceuticals, and the cleanup of exhaust from automobiles and stationary power plants. Sintering, or thermal deactivation, is an important mechanism for the loss of catalyst activity. In order to initiate a systematic study of the dynamics and sintering of nanoparticles, various catalytic systems have been...

  13. Dynamic gamma knife radiosurgery.

    Science.gov (United States)

    Luan, Shuang; Swanson, Nathan; Chen, Zhe; Ma, Lijun

    2009-03-21

    Gamma knife has been the treatment of choice for various brain tumors and functional disorders. Current gamma knife radiosurgery is planned in a 'ball-packing' approach and delivered in a 'step-and-shoot' manner, i.e. it aims to 'pack' the different sized spherical high-dose volumes (called 'shots') into a tumor volume. We have developed a dynamic scheme for gamma knife radiosurgery based on the concept of 'dose-painting' to take advantage of the new robotic patient positioning system on the latest Gamma Knife C and Perfexion units. In our scheme, the spherical high dose volume created by the gamma knife unit will be viewed as a 3D spherical 'paintbrush', and treatment planning reduces to finding the best route of this 'paintbrush' to 'paint' a 3D tumor volume. Under our dose-painting concept, gamma knife radiosurgery becomes dynamic, where the patient moves continuously under the robotic positioning system. We have implemented a fully automatic dynamic gamma knife radiosurgery treatment planning system, where the inverse planning problem is solved as a traveling salesman problem combined with constrained least-square optimizations. We have also carried out experimental studies of dynamic gamma knife radiosurgery and showed the following. (1) Dynamic gamma knife radiosurgery is ideally suited for fully automatic inverse planning, where high quality radiosurgery plans can be obtained in minutes of computation. (2) Dynamic radiosurgery plans are more conformal than step-and-shoot plans and can maintain a steep dose gradient (around 13% per mm) between the target tumor volume and the surrounding critical structures. (3) It is possible to prescribe multiple isodose lines with dynamic gamma knife radiosurgery, so that the treatment can cover the periphery of the target volume while escalating the dose for high tumor burden regions. (4) With dynamic gamma knife radiosurgery, one can obtain a family of plans representing a tradeoff between the delivery time and the dose

  14. Structural dynamics analysis

    Science.gov (United States)

    Housner, J. M.; Anderson, M.; Belvin, W.; Horner, G.

    1985-01-01

    Dynamic analysis of large space antenna systems must treat the deployment as well as vibration and control of the deployed antenna. Candidate computer programs for deployment dynamics, and issues and needs for future program developments are reviewed. Some results for mast and hoop deployment are also presented. Modeling of complex antenna geometry with conventional finite element methods and with repetitive exact elements is considered. Analytical comparisons with experimental results for a 15 meter hoop/column antenna revealed the importance of accurate structural properties including nonlinear joints. Slackening of cables in this antenna is also a consideration. The technology of designing actively damped structures through analytical optimization is discussed and results are presented.

  15. Dynamic gamma knife radiosurgery

    Science.gov (United States)

    Luan, Shuang; Swanson, Nathan; Chen, Zhe; Ma, Lijun

    2009-03-01

    Gamma knife has been the treatment of choice for various brain tumors and functional disorders. Current gamma knife radiosurgery is planned in a 'ball-packing' approach and delivered in a 'step-and-shoot' manner, i.e. it aims to 'pack' the different sized spherical high-dose volumes (called 'shots') into a tumor volume. We have developed a dynamic scheme for gamma knife radiosurgery based on the concept of 'dose-painting' to take advantage of the new robotic patient positioning system on the latest Gamma Knife C™ and Perfexion™ units. In our scheme, the spherical high dose volume created by the gamma knife unit will be viewed as a 3D spherical 'paintbrush', and treatment planning reduces to finding the best route of this 'paintbrush' to 'paint' a 3D tumor volume. Under our dose-painting concept, gamma knife radiosurgery becomes dynamic, where the patient moves continuously under the robotic positioning system. We have implemented a fully automatic dynamic gamma knife radiosurgery treatment planning system, where the inverse planning problem is solved as a traveling salesman problem combined with constrained least-square optimizations. We have also carried out experimental studies of dynamic gamma knife radiosurgery and showed the following. (1) Dynamic gamma knife radiosurgery is ideally suited for fully automatic inverse planning, where high quality radiosurgery plans can be obtained in minutes of computation. (2) Dynamic radiosurgery plans are more conformal than step-and-shoot plans and can maintain a steep dose gradient (around 13% per mm) between the target tumor volume and the surrounding critical structures. (3) It is possible to prescribe multiple isodose lines with dynamic gamma knife radiosurgery, so that the treatment can cover the periphery of the target volume while escalating the dose for high tumor burden regions. (4) With dynamic gamma knife radiosurgery, one can obtain a family of plans representing a tradeoff between the delivery time and the

  16. Dynamic gamma knife radiosurgery

    Energy Technology Data Exchange (ETDEWEB)

    Luan Shuang; Swanson, Nathan; Chen Zhe [Department of Computer Science, University of New Mexico, Albuquerque, NM 87131 (United States); Ma Lijun [Department of Radiation Oncology, University of California San Francisco, San Francisco, CA 94143 (United States)], E-mail: sluan@cs.unm.edu, E-mail: nate@cs.unm.edu, E-mail: zchen@cs.unm.edu, E-mail: lijunma@radonc.ucsf.edu

    2009-03-21

    Gamma knife has been the treatment of choice for various brain tumors and functional disorders. Current gamma knife radiosurgery is planned in a 'ball-packing' approach and delivered in a 'step-and-shoot' manner, i.e. it aims to 'pack' the different sized spherical high-dose volumes (called 'shots') into a tumor volume. We have developed a dynamic scheme for gamma knife radiosurgery based on the concept of 'dose-painting' to take advantage of the new robotic patient positioning system on the latest Gamma Knife C(TM) and Perfexion(TM) units. In our scheme, the spherical high dose volume created by the gamma knife unit will be viewed as a 3D spherical 'paintbrush', and treatment planning reduces to finding the best route of this 'paintbrush' to 'paint' a 3D tumor volume. Under our dose-painting concept, gamma knife radiosurgery becomes dynamic, where the patient moves continuously under the robotic positioning system. We have implemented a fully automatic dynamic gamma knife radiosurgery treatment planning system, where the inverse planning problem is solved as a traveling salesman problem combined with constrained least-square optimizations. We have also carried out experimental studies of dynamic gamma knife radiosurgery and showed the following. (1) Dynamic gamma knife radiosurgery is ideally suited for fully automatic inverse planning, where high quality radiosurgery plans can be obtained in minutes of computation. (2) Dynamic radiosurgery plans are more conformal than step-and-shoot plans and can maintain a steep dose gradient (around 13% per mm) between the target tumor volume and the surrounding critical structures. (3) It is possible to prescribe multiple isodose lines with dynamic gamma knife radiosurgery, so that the treatment can cover the periphery of the target volume while escalating the dose for high tumor burden regions. (4) With dynamic gamma knife radiosurgery, one can

  17. Gravitational Lensing & Stellar Dynamics

    CERN Document Server

    Koopmans, L V E

    2005-01-01

    Strong gravitational lensing and stellar dynamics provide two complementary and orthogonal constraints on the density profiles of galaxies. Based on spherically symmetric, scale-free, mass models, it is shown that the combination of both techniques is powerful in breaking the mass-sheet and mass-anisotropy degeneracies. Second, observational results are presented from the Lenses Structure & Dynamics (LSD) Survey and the Sloan Lens ACS (SLACS) Survey collaborations to illustrate this new methodology in constraining the dark and stellar density profiles, and mass structure, of early-type galaxies to redshifts of unity.

  18. Complexified dynamical systems

    Energy Technology Data Exchange (ETDEWEB)

    Bender, Carl M [Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, NM 87545 (United States); Holm, Darryl D [Department of Mathematics, Imperial College, London SW7 2AZ (United Kingdom); Hook, Daniel W [Blackest Laboratory, Imperial College, London SW7 2BZ (United Kingdom)

    2007-08-10

    Many dynamical systems, such as the Lotka-Volterra predator-prey model and the Euler equations for the free rotation of a rigid body, are PT symmetric. The standard and well-known real solutions to such dynamical systems constitute an infinitessimal subclass of the full set of complex solutions. This paper examines a subset of the complex solutions that contains the real solutions, namely those having PT symmetry. The condition of PT symmetry selects out complex solutions that are periodic. (fast track communication)

  19. Maya Studio Projects Dynamics

    CERN Document Server

    Palamar, Todd

    2009-01-01

    The only hands-on book devoted to mastering Maya's dynamics tools for water, wind, and fire. In the world of animation, the ability to create realistic water, wind, and fire effects is key. Autodesk Maya software includes powerful dynamics tools that have been used to design breathtaking effects for movies, games, commercials, and short films. This professional guide teaches you the primary techniques you need to make the most of Maya's toolkit, so you'll soon be creating water that ripples, gusting winds and gentle breezes, and flickering fires the way Hollywood pros do. The one-of-a-kind boo

  20. Organisations’ evolutionary dynamics: a group dynamics approach

    Directory of Open Access Journals (Sweden)

    Germán Eduardo Vargas

    2010-04-01

    Full Text Available Colombian entrepreneurs’ straggling, reactionary and inertial orientation has been inconsistently lustified by the availability of internal and leveraged resources, a concept intensifying deficient technological capacity. Company activity (seen as being a socioeconomic unit has been integrally orientated within an evolutionary framework by company identity and cohesion as well as adaptation and evolutionary mechanisms. The present document uses a group dynamics’ model to illustrate how knowledge-based strategic orientation and integration for innovation have become an imperative for development, from slight leverage, distinguishing between two evolutionary company forms: traditional economic (inertial, as they introduce sporadic incremental improvements and modern companies (dynamic and radical innovators. Revealing conclusions obtained from such model may be used for intervening in and modernising company activity.