Crack problems in the classical theory of elasticity : by I. N. Sneddon and M. Lowengrub. 221 pages,diagrams, 6×9 in. New York,John Wiley, 1969. Price, $14.95.     

Alan I. Soler 《Journal of The Franklin Institute》1971

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The high road : Ben Bova. 289 pages,diagrams, 6 × 9 in. Houghton-Mifflin,New York 1981. Price, $11.95.     

I.M. Levitt 《Journal of The Franklin Institute》1982,313(2):120-121

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Externalities, technological complementarities and sustained economic growth     

Kenneth I. Carlaw  Richard G. Lipsey   《Research Policy》2002,31(8-9)

Externalities as conventionally defined miss many of the spillovers that are both causes and consequences of the technological changes that underlie economic growth. We introduce a much wider concept called technological complementarities. New general purpose technologies (GPTs) rejuvenate the growth process by creating technological complementarities, which are adequately measured neither by total factor productivity (TFP) nor by externalities. There would be major gains from technological change even if the returns on capital invested in innovation never exceeded the returns on investing in existing technologies so that there were neither externalities nor positive changes in TFP.  相似文献   

Using A Split-ballot Survey to Explore the Robustness of the 'MIP' Question in Agenda-Setting Research: A Methodological Study     

Min  Young; Ghanem  Salma I.; Evatt  Dixie 《Int. Journal of Public Opinion Research》2007,19(2):221-236

Three aspects of the ‘most important problem’ questionused in agenda-setting research to measure issue salience amongthe public were examined. A split-ballot design in a state-widesurvey compared versions of the public agenda with a socialframe of reference versus a personal frame of reference, versionsusing the traditional term ‘problem’ versus ‘issue’,and the effects of question order. High correlations betweenthe different versions were found in all three sets of comparisons.  相似文献   

Qualitative and quantitative analysis of goat ovaries,follicles and oocytes in view of in vitro production of embryos     

Islam MR  Khandoker MA  Afroz S  Rahman MG  Khan RI 《Journal of Zhejiang University. Science. B》2007,8(7):465-469

Goat ovaries were collected from the slaughterhouse and categorized as right, left, corpus luteum （CL）-present and -absent group and evaluated on the basis of weight （g）, length （cm）, width （cm）, number of follicles, follicles aspirated and number and state ofcumulus-oocyte-complexes （COCs）. Comparatively higher weight [（0.66±0.02） vs （0.64±0.02） g], length [（1.17±0.02） vs （1.1 ±0.02） cm] and width [（0.77±0.02） vs （0.74±0.02） cm] were found in right ovaries than those of left. On the other hand significantly （P〈0.05） higher weight [（0.71±0.03） vs （0.64±0.01） g] and width [（0.76±0.03） vs （0.75±0.01） cm] were found in CL-present group than those of CL-absent group of ovaries. The left ovaries contained comparatively higher number of normal COCs [（1.06±0.09） per ovary] than fight ovaries [（1.03±0.10） per ovary] and the similar trend was found in total number of follicles [（4.51±0.25） vs （4.30±0.23） per ovary] and follicles aspirated [（2.55±0.14） vs （2.52±0.12） per ovary]. But the total COCs per ovary was almost similar in both ovaries [right and left： （1.85±0.12） and （1.85±0.11） per ovary, respectively]. Higher number of total COCs [（1.87±0.09） vs （1.76±0.16） per ovary], total number of follicles [（4.45±0.19） vs （4.16±0.37） per ovary], follicles aspirated [（2.55±0.10） vs （2.48±0.21） per ovary] and normal COCs [（1.12±0.07） vs （0.76±0.14） per ovary] were found in CL-absent group than those of CL-present group of ovaries.  相似文献   

Phenomenal permanence and the development of predictive tracking in infancy     

Bertenthal BI  Longo MR  Kenny S 《Child development》2007,78(1):350-363

The perceived spatiotemporal continuity of objects depends on the way they appear and disappear as they move in the spatial layout. This study investigated whether infants' predictive tracking of a briefly occluded object is sensitive to the manner by which the object disappears and reappears. Five-, 7-, and 9-month-old infants were shown a ball rolling across a visual scene and briefly disappearing via kinetic occlusion, instantaneous disappearance, implosion, or virtual occlusion. Three different measures converged to show that predictive tracking increased with age and that infants were most likely to anticipate the reappearance of the ball following kinetic occlusion. These results suggest that infants' knowledge of the permanence and nonpermanence of objects is embodied in their predictive tracking.  相似文献   

Ghosts in the Nursery 2.0     

Margarete I. Bolten 《Parenting, science and practice》2019,19(1-2):168-172

SYNOPSIS

Parental working is not unambiguously beneficial for children. On the one hand, working parents can be positive role models for their children, and income can improve children’s lives in many ways. On the other hand, work can impair parent-child interactions, especially when the parents experience high levels of working stress. In my commentary, I conclude that the paper by River, enjoys strong support for the impact of maternal state anxiety (attachment anxiety) and work-interfering-with-family (WIF)-conflict related guilt on parents behaviors. Considering the cognitive-relational stress-theory by Lazarus and Folkman, the balance of personal resources and external demands can explain parental stress, which could be associated with parental behavior. Full-time-working parents, who experience high levels of guilt and report high levels of attachment anxiety, are more prone to show low levels of stress resistance toward crying infants. However, these associations are not studied in families with high risk factors. Furthermore, future studies should include aspects of mental health status in a theoretical model. Taken together, the target article provides a solid foundation for further research. I also propose to transfer the findings into more realistic research setting, which includes high-risk groups (parents with low socioeconomic status, low-income, mental health problems) to study how infant cry can influence parents’ patterns of care and abuse. The commentary tries to enrich the study by including Fraiberg’s “ghosts in the nursery” to further integrating parental mentalizing processes in the model explaining parents’ reactions to infant cry signal in the context of WIF conflicts.  相似文献   

I.S. 201 PARENT‐COMMUNITY COMMENTARY     

Parent/Community Negotiating Committee for I.S. 《Equity & Excellence in Education》2013,46(1):50-52

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CENTRAL AGENCY RENEWAL AND EDUCATIONAL GOAL SETTING     

Rabbi Howard I. Bogot 《Journal of Jewish Education》2013,79(3-4):29-31

The infrequently used label mishshamshim baKodesh may well capture the essential life-style most needed, and authentic, for bureaus of education; central agencies for Jewish education in communities whose variant demographics and structure mandate a caveat for generalizations.  相似文献   

The Rôle of Television in the Teaching of Modern Languages     

I. Gourine 《Educational Media International》2013,50(3):24-26

Black author James Baldwin has observed, ‘People are trapped in history and history is trapped in them. This perceptive comment invites teachers to explore the experiences of their students as the content of classroom instruction. Unfortunately, most history instructors have ignored this approach. This omission is particularly lamentable in regard to black students. The ability of a teacher to stimulate reflection on issues of significance to young blacks is clearly dependent upon his or her skill in identifying the universal concerns of the Afro-American community. One instructional resource that might help a history instructor accomplish this goal is popular music. However, the lyrics of black singers are rarely introduced in the classroom. One critic has capsuled the shortsightedness of this instructional omission by noting, ‘Black music has been the vanguard reflection of black feeling and the continuous repository of black consciousness’. His words warrant serious consideration by history teachers.  相似文献