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101.
102.
应用于中速和高速包装机的槽轮等间歇机构在超高速度下冲击、震动和噪声状况会变得更加严重,在YB48超高速硬盒包装机内框纸传送装置上已不能适用。故在YB48超高速包装机内框纸传送装置上采用了齿轮四杆机构,可实现动作输出件动停衔接平稳,加速度和跃度曲线连续平滑,满足连续传送要求的同时大大提高了内框纸输送部件在超高速下的高效性和稳定性。 相似文献
103.
北京“众创空间”区位选择特征及影响因子分析 总被引:1,自引:0,他引:1
“众创空间”是新兴的创新创业的载体,其区位选择是需要探讨的重要理论问题。将核密度估计分析法和Ripley’s K函数分析法相结合来研究北京市“众创空间”的区位分布特点,并运用因子分析法对影响“众创空间”区位选择的因子进行分析。研究表明:北京市“众创空间”主要位于北京市城区北部三环至城区北部五环内,尤其是中关村大街。中关村大街是北京市“众创空间”最集聚的地方;不同形式的“众创空间”其集聚特点不同,传统孵化器的区位选择空间范围远远大于新型孵化器的区位选择空间范围,这种现象是受到产业环境、创新环境、创新生活设施等因子综合作用的结果。这对未来北京市制订创新创业政策以及不同形式“众创空间”的区位选取具有重要的参考意义。 相似文献
104.
Helene Cherrier 《Journal of Marketing Management》2017,33(7-8):602-623
ABSTRACTTaking inspiration from assemblage thinking and the vitality of matter, this study examines the negotiated, contested and nonlinear formation of highly marginalised and stigmatised alternative food market. The analysis of an ethnographic case study shows that tensions of disorder, abjection and dangerisation spark when components of an alternative food market assemblage misaligns with prevailing social norms, values and institutional arrangements. Although these tensions threaten the alternative food market assemblage, further analysis reveals the capacity of food to assuage these tensions and this occurred, in part; because food catalyses human engagement through visceral encounters, bodily interactions and contagious magic. To that end, the study sets a new agenda for alternative market research to consider the sensory, corporeal and magical capacity of matter to provoke in humans a new sensitivity to our wasteful practices, endangered planet, social inequalities and prejudices. 相似文献
105.
本文借助Glosten/Milgrom(1985)的信息模型来分析在证券市场存在非对称信息的情况下,做市商为避免在和知情交易者进行交易时由于信息的不完整性时产生损失,而确立一个股票买卖价格的差额。做市商通过观察交易者的交易委托类型,借助贝叶斯定理来学习信息的反馈,而股票的真正价值会随着交易过程的延续最终体现在股票的价格中。该模型的研究为我国做市商制度的发展和完善提供了必要的理论依据。 相似文献
106.
SATURNINO M. BORRAS JR 《Journal of Agrarian Change》2008,8(2-3):258-289
Vía Campesina's 'Global Campaign for Agrarian Reform' (GCAR) has made a significant impact (inter)nationally in reshaping the terms of the land reform debates. However, its impact on other land policy dynamics has been marginal. Meanwhile, the campaign inadvertently exposed latent class-based and ideological distinctions within the transnational network. This essay explains how the GCAR emerged, and has been able to influence the broader global land reform debates, but has not been able (so far) to significantly impact other major dimensions of the land policy debates. It argues that if GCAR is to retain relevance, it must deepen and broaden its current position on land to go beyond the parameters of conventional land reform. Moreover, it must also find ways to better integrate 'global issue framing from above' with 'local/national campaigns from below' if it is to strengthen its process of 'issue/campaign externalization/transnationalization'. Doing this may require the network to rethink some of its well-established organizational practices and ideological perspectives. 相似文献
107.
《Business Horizons》2017,60(6):783-794
Maker technologies, including collaborative digital fabrication tools like 3-D printers, enable entrepreneurial opportunities and new business models. To date, relatively few highly successful maker startups have emerged, possibly due to the dominant mindset of the makers being one of cooperation and sharing. However, makers also strive for financial stability and many have profit motives. We use a multiple case study approach to explore makers’ experiences regarding the tension between sharing and commercialization and their ways of dealing with it. We conducted interviews with maker initiatives across Europe including Fab Labs, a maker R&D center, and other networks of makers. We unpack and contextualize the concepts of sharing and commercialization. Our cross-case analysis leads to a new framework for understanding these entrepreneurs’ position with respect to common-good versus commercial offerings. Using the framework, we describe archetypal trajectories that maker initiatives go through in the dynamic transition from makers to social enterprises and social entrepreneurs. 相似文献
108.
Noaman G. Ali 《Journal of Agrarian Change》2020,20(2):270-288
State formation in post‐colonial societies is often explained with reference to the roles of elites. In Pakistan, landed elites continue to dominate the rural political economy through informal and formal institutions, but the history of its largest peasant movement shows how agrarian class struggle can change the institutional forms and functions of power. The Hashtnagar peasant movement achieved lasting de facto land and tenancy reforms in north‐western Pakistan in the 1970s through forcible land occupations that were regularized by state intervention. I argue that although divisions among elites were important, the state intervened in favour of peasants due to the rising organizational power of tenants and landless labourers under the centralized leadership of the radical Mazdoor Kisan Party. Agrarian class struggle weakened the informal power of landed elites and gave rise to institutions of peasant power. However, other fractions of the ruling class sought to undermine their landed opponents while co‐opting the militancy of the peasant movement by strengthening state institutions to intervene in favour of upwardly mobile tenants. The latter were separated from poorer peasants and the landless, thus demobilizing the movement. 相似文献
109.
学校体育教学与运动训练的主要任务是增强学生体质,促进学生身心协调发展,培养学生体育运动能力和良好的思想品质。而中长跑运动又是体育教学与运动训练中一个重要方面。要搞好中长跑运动,学生的思想准备、身体准备、设施准备都必须提前"介入",诚所谓"兵马未到,粮草先行"。文章从饮食准备、身体放松准备、素质准备及运动前的各种预热练习进行了较深刻的论述。 相似文献
110.
Jennifer F. Rinella;Merritt Neil; 《International Journal of Nonprofit & Voluntary Sector Marketing》2024,29(2):e1850
This case study examines the Veterans of Foreign Wars (VFW) efforts over the past 3 years through #StillServing, a movement to highlight the stories and voices of veterans who continue to serve their communities in various ways, provide avenues for communities to coalesce around volunteerism, and attract younger generations for a wider range of engaged veterans. With an overarching goal to amplify the perception of the VFW as a place for dedicated veterans of all stripes to continue their service to country and their communities, the campaign spotlights men and women who exemplify the best of what it means to be a VFW member through storytelling emphasizing diversity, tenacity, and an enduring commitment to serve. Informed by findings from individual interviews conducted with a diverse group of U.S. military veterans, targeted messages with specific calls to action were developed for younger veterans. The association sought to take advantage of the most relevant and effective media to share its message while ultimately encouraging the veteran and military community to share their own stories of continued service through #StillServing. The case shares lessons learned from the campaign's iterative approach and offers creative, tested strategies for other programs seeking to engage younger generations. 相似文献