塔里木盆地库车坳陷致密砂岩储层孔隙结构与天然气运移特征     

范俊佳  周海民  柳少波 《中国科学院大学学报》2014,31(1):108-116

以中国致密砂岩气未来潜力区塔里木盆地库车坳陷为研究区,通过显微镜下观测、毛细管压力曲线测试、孔渗测试和天然气运移物理模拟实验,研究致密砂岩储层孔隙结构及天然气在致密储层中的充注运移特征. 结果表明,1）研究区致密砂岩储层孔隙结构以溶蚀孔与槽型孔为主,孔隙半径主要在0.1 μm左右;2）致密砂岩储层的渗透率与孔隙度没有明显的相关性,渗透率主要受孔隙结构与裂缝发育控制;3）天然气在致密砂岩储层中运移需要一定的启动压力梯度,渗透率越高,需要的启动压力梯度越小;4）岩石中裂缝发育会显著降低启动压力梯度;5）致密砂岩中天然气的运移过程可分为3个阶段,即单个气泡游离聚集-形成连续相-连续相运移.  相似文献   

Good intentions are not enough: A case study uncovering perpetuation of internalized and interpersonal oppression in middle school STEM classrooms     

Khanh Q. Tran  S. Selcen Guzey 《科学教学研究杂志》2024,61(3):706-735

Science teachers and educators seek to promote equity and inclusion within their classrooms. Yet, many do not examine how their roles could reproduce oppression that continues to exclude certain groups of students. Centering on how oppression interacts with science teaching and learning, this naturalistic study observed Ms. William and her implementation of two STEM units that integrate science and engineering, to understand power, race, and privilege dynamics in her middle school STEM classrooms. Specifically, we focused on understanding oppression at the interpersonal and internalized level in Ms. William's class. We collected and analyzed video recorded lessons from two different classrooms, two STEM curricula Ms. William had co-developed, and conducted semi-structured interviews after she taught her two STEM units. We identified themes of oppression perpetuated in the classroom by employing thematic analysis, which when guided by our theoretical framework enabled us to illuminate the complex relationship between science teaching and maintaining whiteness as the dominant discourse in science learning. Our findings suggest that an active and critical role from science teachers and educators are required; we must reflect deeply on our science curriculum and teaching strategies and identify practices that remains to be oppressive if promoting equity and inclusion is at the forefront of our science teaching.  相似文献   

Canonical versus “me” studies: a Shakespearean moonlights as an Asian Americanist     

Seiwoong Oh 《Inter-Asia Cultural Studies》2019,20(4):596-603

ABSTRACT

Some philosophers and sociologists have recently criticized scholars who engage in so-called “me studies” – members of oppressed groups who study their own oppression. Such “me” studies, according to these critics, are self-serving, susceptible to biases, and generally bad at taking criticism from outsiders, many of whom may be afraid to speak up for fear of appearing to be unsympathetic racists or bigots. By examining standpoint epistemology in various disciplines, by reflecting on my own experience of being trained as a Shakespearean and studying Asian American literature, and by reviewing the history of Asian American scholarship in the United States, I defend “me studies” as a way to move towards the goal of inclusion and global social justice.  相似文献   

复等角紧框架的性质     

田新现  李登峰 《中国科学院大学学报》2011,28(6):715-721

研究Hilbert空间上复等角紧框架的性质. 首先,建立复等角紧框架的一些必要条件;其次,实等角紧框架的一些结果被拓广到复等角紧框架上.  相似文献   

右可逆环的性质     

庞羽  王尧 《临沂师范学院学报》2009,31(6):18-21

引入右可逆环的定义,同时将可逆环的一些结论推广到右可逆环上．证明了右可逆环上的n×n上三角矩阵环Tn（R）是右可逆环;R是右可逆环,则R[x]／（x^n）是右可逆环,其中对任意正整数n,（x^n）是由x^n生成的理想．  相似文献   

BSW and MSW Students’ Opinions About and Responses to the Death of Freddie Gray and the Ensuing Riots: Implications for the Social Justice Emphasis in Social Work Education   总被引：1，自引：1，他引：0  

Carolyn Knight 《Journal of Teaching in Social Work》2017,37(1):3-19

In April 2015, a Black man, Freddie Gray, died in police custody in Baltimore, Maryland. A day of rioting followed. These events provided the researcher with the opportunity to ascertain social work students’ opinions about and actions in response to these occurrences and their implications for the social justice mission of the social work profession. Students expressed a commitment to social justice and reported that it was emphasized in their education. A significant minority indicated that the Gray case was not addressed in any of their social work classes or in their field practicum. Although respondents reported that the Gray case further enhanced their commitment to the principle of social justice, few engaged in any sort of activity in response to Gray’s death and the unrest either at the time of the events or 6 months later. Implications for social work education are discussed.  相似文献   

峭壁中的百合在绝境中恣情绽放——浅析玛雅·安吉罗的自传体小说     

于小丹 《齐齐哈尔师范高等专科学校学报》2011,(1):51-52

美国黑人文学是当代美国文学中的一簇奇葩,这其中最为别致的一只百合就是玛雅.安吉罗。作为当代美国最为杰出的黑人女作家,她不仅才华横溢、作品频频获奖,并高居畅销书榜经久不衰,而且她的传奇经历更使她成为反抗种族歧视和男权压迫下的黑人女性的代言人,她的自传体小说也被美国文学界所广泛认可,成为颂扬黑人女性柔韧、坚定、自强不息、奋发向上的精神体现。  相似文献   

中国服务外包企业紧缺人才分析   总被引：1，自引：0，他引：1  

谌莉 《湖北成人教育学院学报》2015,21(4)

大力发展服务外包产业是当前经济发展的需要,是中国经济新的增长点,是拓宽就业渠道、吸纳大学生就业的新高地.而目前服务外包企业所需的人才只能依靠企业本身的招聘、培养和开拓,成本高,周期长,人才的缺乏制约了服务外包产业的发展.本文通过对服务外包产业背景的分析,指出了人才缺乏是制约中国服务外包企业发展壮大的根本因素,并提出了校企共建人才的对策.  相似文献   

基于稀疏表示的摩尔纹噪声去除方法     

张维国 《教育技术导刊》2021,20(1):219-225

为去除常出现在图像采集和日常摄影中的摩尔纹噪声,提出一种由样条小波生成的紧框架下的稀疏信号恢复算法。该算法利用摩尔纹噪声的频域特性确定受影响的傅里叶频谱区域;利用图像在给定紧框架下的稀疏性,根据压缩感知理论实现数据在傅里叶频谱上的非线性插值。实验结果表明,相比传统频域滤波算法,该算法恢复图像的峰值信噪比更高,更符合人的视觉审美,在去除摩尔纹噪声的同时,还可有效保留图像边缘信息。  相似文献   

紧固模套的强度和刚度校核     

徐美银 《扬州职业大学学报》2001,5(2):32-35

紧固模套是组合模具中最常使用的结构，由于装配前存在过盈以及工作过程中冲裁力的作用，设计时必须对紧固模套进行强度和刚度校核。本介绍这两种校核的一般方法，并用工程实例说明。  相似文献