跨座式单轨构架焊缝疲劳分析方法研究

构架是跨座式单轨车辆的承载基础,其焊接结构的强度与可靠性事关车辆运行安全.跨座式单轨车辆运行期间构架受到轨道梁路面的激励以及指形板的冲击.为提高构架焊缝结构疲劳计算精度,本文考虑构架自身结构固有动态特性对疲劳性能的影响,建立了一套的疲劳计算分析方法.     

巴拉圭茶对高脂血症小鼠氧化还原状态的影响

探讨不同剂量巴拉圭茶对高脂血症小鼠氧化还原状态的影响。通过高脂日粮建立高脂血脂小鼠模型,随机分为模型组、巴拉圭茶低剂量组、巴拉圭茶高剂量组,对照组饲喂基础日粮,模型组饲喂高脂日粮,巴拉圭茶低剂量组、巴拉圭茶高剂量组饲喂高脂日粮并分别灌胃1 g·kg^-1、2 g·kg^-1巴拉圭茶,连续灌胃4周,处死小鼠,测定小鼠肝脏中活性氧自由基(ROS)水平、超氧化物歧化酶(SOD)活性、过氧化氢酶(CAT)活性、丙二醛(MDA)的含量。与模型组相比,低剂量、高剂量巴拉圭茶可显著降低小鼠肝脏中ROS水平、MDA含量(p<0.05),可显著提高小鼠肝脏中SOD、CAT活性(p<0.05)。巴拉圭茶对高脂血症小鼠氧化应激具有一定的调节作用。     

坚持科学防沙治沙用沙 努力推进我国防沙治沙工作

从生态功能、产业治沙、综合效益、保障体系、国际影响五个方面介绍了我国防沙治沙事业凸现出的五大变化,根据加快构建北方生态屏障、应对气候变化与加快经济发展方式转变的新形势,针对目前防沙治沙面临的困难和挑战,从宏观管理层面提出了防沙治沙的五个坚持和重点工作。     

泵站底板应力弹性地基梁法与三维静力计算对比分析

底板在泵站结构计算中占重要地位。在对长洲水利枢纽库区防护下六河泵站底板应力进行计算,分别采用弹性地基梁法、三维静力（通用软件KNSYS）计算,对应力结果进行综合分析表明,三维应力分析对边墙与底板结合处、弹性地基梁法对底板中部,与实际受力状态较为一致,为下一步结构设计优化提供依据。     

多跨连续-刚构桥梁施工的高程及应力控制——以新疆克其克苏布台大桥为例

为实现桥梁施工精度的准确控制,保证桥梁施工质量符合设计要求,对某多跨连续-刚构桥梁的施工控制进行了计算分析。首先,通过理论计算桥梁的预拱度,并在施工过程中采取相应的高程及应力控制措施;其次,通过现场实测,对施工过程中的高程及应力进行实时监测,将监测值与控制值进行比较,以评价控制效果。实例检验结果表明:在高程控制方面,最终合龙高程误差不超过8mm,满足了桥梁的线型要求;在应力控制方面,主梁和墩身应力均为压应力,且远小于规范限值,满足设计要求。因此,在桥梁施工过程中,通过理论计算与施工控制相结合的方法,能够实现桥梁高程及应力的有效控制,达到预期效果。桥梁施工控制措施的有效性在研究中得到了验证,可为类似桥梁施工提供参考。     

Job stress and well-being of female employees in hospitality: The role of regulatory leisure coping styles

The job stress and coping behavior of female employees has become a key issue in the hospitality industry. This study investigates the moderating role of regulatory leisure coping styles on the effect of job stress on female employees’ well-being. Specifically, this study extends Patry et al.’s (2007) findings to further confirm the direct and moderating role of regulatory leisure coping styles in the relationship between job stress and well-being. Data were collected from the female employees of 22 tourist hotels in Taiwan. The results showed that the Planned-Breather Leisure Coping Style (PBLCS) was positively and significantly associated with well-being, whereas the Avoidant Leisure Coping Style (ALCS) had a negative and significant effect on it. In addition, the results also revealed that the PBLCS plays a buffering role, but that the ALCS plays an amplifying role. Based on these findings, the implications and research suggestions are then discussed.     

早春花卉侧金盏的抗寒性研究

研究不同低温胁迫下侧金盏叶组织内过氧化物酶（POD）活性、超氧化物歧化酶（SOD）活性、CAT活性、电导率、叶绿素含量及丙二醛含量的变化规律,确定影响其抗寒性的主效因子,探讨低温胁迫下侧金盏的抗寒机理。     

心理干预复合咪达唑仑对腔镜手术心理应激反应的影响

探讨心理干预复合咪达唑仑对腹腔镜全宫切除患者术前心理应激反应的影响。择期行腹腔镜全宫切除术患者90例,ASAI或Π级,随机等分为3组：对照组（C组）,不用术前用药;咪达唑仑组（M组）,术前30 min肌注咪达唑仑0.05 mg/kg;心理干预复合咪达唑仑组（PIM组）,按照心理干预方法进行术前访视,术前30 min肌注咪达唑仑0.05 mg/kg。术晨8时及入室后即刻测定3组患者的血清ACTH、Cor、AT-Π与IL-6水平,记录术前一日访视时及入室后即刻的MAP、HR和SpO2值,并行S-AI、AVAT评分。心理干预复合咪达唑仑能明显减轻腹腔镜全宫切除术患者术前的心理负担和焦虑程度,不失为一种调控手术患者术前急性不良心理应激反应的简便易行而又切实有效的方法。     

Achievements and gaps in tef productivity improvement practices in the marginal areas of Northern Ethiopia: implications for future research directions

Tef is the most important crop in Ethiopia and is well-adapted to growing environments, but grain yields are low. The government is therefore promoting the adoption of improved varieties, inorganic fertilizers and new planting techniques. This study gathered information on the use of new agronomic practices and barriers to their adoption through a semi-structured questionnaire administered to 60 farmers or respondents from each of 4 districts of Tigray region in northern Ethiopia viz Laelay-Maichew, Medebay-Zana, Ahferom and Alamata. Data were coded and analysed using SPSS software. Except for animal feed and crop rotation, there were significant differences between districts in the relative importance of several criteria for different uses. Improved varieties were used by the majority of respondents in all districts and fertilizers in all except Alamata where severe moisture stress dictated the choice of variety and reduced fertilizer application. Weed control was mainly by hand except in Alamata where chemical control was common because of the predominance of broad-leaved weeds. Transplanting maximized the yield of tef, but a cost–benefit analysis showed that row sowing was more profitable. The study concluded that new varieties better adapted to the likelihood of reduced rainfall and that respond efficiently to fertilizer inputs need to be developed. Until suitable technologies are available, high labour costs would in part dictate some agronomic practices, even if this led to lower yields.     

Patient- and clinician-reported satisfaction with pharmacological stress agents for single photon emission computed tomography (SPECT) myocardial perfusion imaging (MPI)

Abstract

Objective:

The objective of this study was to compare clinician and patient measures of satisfaction with two pharmacological stress agents (PSA), regadenoson and dipyridamole, used in Single Photon Emission Computed Tomography (SPECT) Myocardial Perfusion Imaging (MPI).

Methods:

This observational study included patients who had undergone SPECT MPI with regadenoson or dipyridamole, as well as the clinician/clinical technologist who performed the test. Mean scores for individual item and domain scores of the main outcome measures were computed as well as the effect sizes (ES) of the mean difference in scores between treatment groups. Statistical significance of the mean item and domain score differences were assessed via Mann-Whitney tests.

Main outcomes measures:

Two self-report questionnaires which had beeb previously developed and validated: Patient Satisfaction/Preference Questionnaire (PSPQ) and Clinician Satisfaction/Preference Questionnaire (CSPQ).

Results:

A total of 87 patients (68 received regadenoson, 19 received dipyridamole) and nine clinicians/clinical technologists took part in the study. Patients had a mean age of 66.8?±?12.2 years, and 56.3% were male. Compared to dipyridamole, use of regadenoson was associated with greater clinician satisfaction on all items and domains of the CSPQ (p?<?0.001 for all comparisons). Among patients, regadenoson was associated with less bother and greater satisfaction than dipyridamole for all items on the PSPQ. These patients reported less stinging at the injection site (ES?=??0.66) and less nervousness during injection (ES?=??0.60). The PSPQ found that regadenoson patients were more satisfied with their PSA than dipyridamole patients in all areas.

Limitations:

This study utilized a relatively small sample size of dipyridamole patients and lacked an adenosine group. A broader sampling of professionals would also help demonstrate generalizability.

Conclusion:

Both patients and clinicians reported higher satisfaction with regadenoson compared to dipyridamole for SPECT-MPI. Clinicians were particularly satisfied with the preparation and administration aspects of the drug, while patients rated it highly on convenience and reduced incidence of side-effects.