Best of both worlds or refusal to comply? The rich kids of Tehran on Instagram

ABSTRACT

This article offers a textual analysis and semiotic reading of the Rich Kids of Tehran's (RKOT’s) Instagram page. Contributing to scholarship on Iranian youth media practices, this article interrogates how the RKOT navigate urban and rural space to engage in everyday processes of resistance against global and local systemic oppression. Grounding their visual representations on Instagram in historical and cultural context, the author questions how and when quotidian actions are transformed into political transgressions when posted on social media. This article emphasizes the RKOT's agency in shaping their brand by analyzing representations of gender performance, intertextuality, and national identity on Instagram.     

从武术自身特性视角思考武术的推广模式

通过对武术本身特性及发展情况的研究,为武术在21世纪的发展提出了四种推广模式,即竞技武术推广模式、传统武术推广模式、武术职业化和商业化推广模式、武术养生健身推广模式。     

信息化科技传播的受众需求分析

科学技术通过科技传播日益深刻地影响着人们的生活,而随着信息化的渗透,科技传播的受众因所处的不同层面产生了多方位的需求变化.研究受众的需求变化成为研究科技传播理论最实际的内容之一.     

振动沉管桩贯入阻力对设计、施工的影响

振动沉管桩因其在施工中明显的优势而被广泛采用，但实际操作中常出现沉桩达不到设计标高现象，而不得不改变施工工艺、更换设备或变更设计，从而延误工期，增加投资等情况。本文通过对振动沉桩的贯入机理、贯入阻力的估算、取值方法、阻力判定及实例分析，让设计、施工人员在设计、施工沉管桩时能合理地确定施工方法、进度、质量。     

Efficacy of massage on muscle soreness,perceived recovery,physiological restoration and physical performance in male bodybuilders

It is believed that sport massage after intensive exercise might improve power and perceptual recovery in athletes. However, few studies have been done in this area. This study aimed to examine the effect of massage on the performance of bodybuilders. Thirty experienced male bodybuilders were randomly assigned to either a massage group (n = 15) or a control group (n = 15). Both groups performed five repetition sets at 75–77% of 1RM of knee extensor and flexor muscle groups. The massage group then received a 30-min massage after the exercise protocol while the control group maintained their normal passive recovery. Criteria under investigation included: plasma creatine kinase (CK) level, agility test, vertical jump test, isometric torque test, and perception of soreness. All variables were measured over 6 time periods: baseline, immediately after the DOMS inducing protocol, right after the massage, and 24, 48, and 72 h after the massage. Both groups showed significant (P < .001) decreases in jumping, agility performance, and isometric torque, but significant (P < .001) increases in CK and muscle soreness levels. The massage group in general demonstrated a better recovery rate. As such, a post-exercise massage session can improve the exercise performance and recovery rate in male bodybuilders after intensive exercise.     

太阳能空间斯特林热机性能的优化分析

建立太阳能驱动的空间斯特林热机的循环模型，应用有限时间热力学理论和太阳能集热器的辐射损失模型，研究受热阻和回热损失影响的太阳能斯特林热机循环性能，导出空间热机效率的基本优化关系，确定太阳能集热器的最佳工作温度和效率界限，讨论各种不可逆性对空间热机性能的影响，所得结论可为太阳能空间斯特林热机的优化设计提供新的理论指导。     

建筑抗震概念设计

本文从建筑的平立面布置、抗震结构体系、结构构件和非结构构件设计等方面阐述了建筑抗震概念设计的一般原则和规律     

Effects of coffee and caffeine anhydrous on strength and sprint performance

Caffeine and coffee are widely used among active individuals to enhance performance. The purpose of the current study was to compare the effects of acute coffee (COF) and caffeine anhydrous (CAF) intake on strength and sprint performance. Fifty-four resistance-trained males completed strength testing, consisting of one-rep max (1RM) and repetitions to fatigue (RTF) at 80% of 1RM for leg press (LP) and bench press (BP). Participants then completed five, 10-second cycle ergometer sprints separated by one minute of rest. Peak power (PP) and total work (TW) were recorded for each sprint. At least 48 hours later, participants returned and ingested a beverage containing CAF (300?mg flat dose; yielding 3–5?mg/kg bodyweight), COF (8.9?g; 303?mg caffeine), or placebo (PLA; 3.8?g non-caloric flavouring) 30 minutes before testing. LP 1RM was improved more by COF than CAF (p?=?.04), but not PLA (p?=?.99). Significant interactions were not observed for BP 1RM, BP RTF, or LP RTF (p?>?.05). There were no sprint?×?treatment interactions for PP or TW (p?>?.05). 95% confidence intervals revealed a significant improvement in sprint 1 TW for CAF, but not COF or PLA. For PLA, significant reductions were observed in sprint 4 PP, sprint 2 TW, sprint 4 TW, and average TW; significant reductions were not observed with CAF or COF. Neither COF nor CAF improved strength outcomes more than PLA, while both groups attenuated sprint power reductions to a similar degree. Coffee and caffeine anhydrous may be considered suitable pre-exercise caffeine sources for high-intensity exercise.     

危机状态下的角色划分及影响机制

危机状态下危机的影响,根据不同的组织及个人在危机状态下受到的影响和做出反应的不同可划分为9种角色,各个角色之间主要涉及到16种危机影响流。不同影响流的表现形式差异较大。这种基于危机角色和影响流来解释危机影响的方法,考虑了不同角色在危机事件中的付出与接受,易于解释危机影响的作用机制和计算危机所带来的各种影响。     

谈双电桥的灵敏度

通过理论和实验两个方面,讨论了如何测量双电桥的灵敏度及影响双电桥灵敏度的因素.