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2.
Deborah C. Blaine John D. Gurosik Seong Jin Park Randall M. German Donald F. Heaney 《Metallurgical and Materials Transactions A》2006,37(3):715-720
Sintering experiments with various molybdenum powders are rationalized using a master sintering curve concept that collapses
density, grain size, or other parameters onto a single curve. In this case, the integral work of sintering is developed and
customized for different green densities. Construction of the master sintering curve is described to show how the curve can
be normalized with respect to green density effects. Various grades of molybdenum for metal injection molding and die compaction
are included in the analysis, processed over a range of heating cycles. Die-compacted samples of varying green densities are
used to illustrate the efficacy of the new, normalized master sintering curve concept. Sintering cycle optimization is one
possible outcome from this analysis. 相似文献
3.
Steven Blaine 《Materials and Structures》1997,30(6):362-365
High energy mixing of calcium sulfate hemihydrate/water slurries provides a means to accelerate the hydration leading to gypsum formation. Additional benefits associated with high energy mixing include enhanced strength of the resulting gypsum casts. In order to exploit the advantages of high energy mixing, an understanding of the relationship between mixing energy and set acceleration is needed. The present study investigated the relationship between a chemical accelerator and high energy mixing for the purpose of set acceleration. A mathematical model of this relationship allows calculation of the time to achieve 50% hydration given the added specific mixing energy, the percentage of added chemical accelerator by weight of stucco, and the water to stucco ratio for a given slurry. Use of this model along with experimental data allowed a comparison of the accelerative efficacy of mixing energy relative to chemical accelerator. The results show that the accelerative capacity of high energy mixing is rather modest compared to that of the chemical accelerator, with a ten-fold increase in mixing energy required to maintain the same time to achieve 50% hydration when the chemical accelerator loading is reduced by 0.03%. 相似文献
4.
We have used in vivo balloon catheterization in combination with in vitro organ culture to develop a model system for vascular neointima formation. A Fogarty balloon catheter was used to deendothelialize and rupture the internal elastic lamina of aortae in adult rabbits. After three d of recovery, aortae were harvested, divided into segments, and placed into organ culture. We obtained a daily index of cell proliferation in cultured vessels using [3H]thymidine incorporation into DNA. Also, segments were collected and processed for routine histology or immunohistochemistry. Aortic segments that had undergone ballooning 3 d before harvest and then cultured exhibited diffuse neointimal growth after several d in vitro, whereas those from sham-operated (nonballooned) rabbits showed generally only a single endothelial cell layer that is characteristic of normal intima. Aortae that were harvested, balloon-damaged in vitro, and then cultured exhibited no neointimal growth. The neointima that developed in cultured segments from in vivo ballooned rabbits was primarily of smooth muscle cell origin as determined by positive immunostaining for alpha-smooth muscle actin. The intima:media thickness ratios were significantly higher in aortic segments from ballooned rabbits at harvest and after 4 or 7 d in culture compared with those from nonballooned rabbits. Also, the [3H]thymidine index was higher in the in vivo ballooned aorta compared to non-ballooned or in vitro ballooned vessel. We conclude that ballooning in vivo followed by exposure to blood-borne elements produces an enhanced proliferative response in cultured vessels that is distinct from other in vitro models of neointimal growth. 相似文献
5.
Recent studies have applied Grottfredson and Hirschi’s General Theory of Crime to investigate whether college students’ inclinations toward internet software piracy is related to low self-control and opportunity (i.e., computer ownership). Given the widespread use of the internet to illegally obtain copies of music and movies, it is important to understand the factors in this form of piracy as well. This study applied the self-control perspective to examine the attitudes of high school students toward the internet piracy of music and movies. Attitudes toward the internet piracy of music and movies were related to self-control, biological sex, internet experience, affiliation with deviant peers, and grade level in this study of high school students. This information is important because studies of internet piracy had not yet confirmed the presence and predictability of internet piracy in high school students. This study also suggests that piracy prevention efforts may be most appropriately focused on high school age individuals and directed toward increasing self-control. 相似文献
6.
C A Walczak L D Blaine M I Krichevsky 《Computer methods and programs in biomedicine》1988,27(3):275-285
System design for the Hybridoma Data Bank, a database of comprehensive information on immunoreagents for use by scientists in diverse disciplines, is described. Unique problems include: use of nomenclature from diverse fields that is neither static nor standard; the need for two representations of the database--textual for readability and numeric for complex search capabilities, analysis and data compression; and a method of translating between the two representations of the database. 相似文献
7.
Deborah C. Blaine Seong Jin Park Randall M. German Pavan Suri 《Metallurgical and Materials Transactions A》2006,37(9):2827-2835
One of the current challenges facing the particulate materials industry is developing simple, accurate models to predict sintered
properties. Work-of-sintering concepts, where time-temperature integrals are used in such models, offer a solution to this
problem. In this study, the master sintering curve concept is applied to several powder metal systems: 17 to 4PH stainless
steel, 316L stainless steel, nickel, niobium, tungsten heavy alloys with two different compositions, and molybdenum. A detailed
explanation of the construction of these curves is given, including methods used to calculate the apparent activation energy
for sintering and to curve-fit experimental data to a sigmoid function describing the master sintering curve. Discussion of
the results shows that the master sintering curve can be applied to powder metal systems, even those that use liquid phase
during sintering. 相似文献
8.
The social, intellectual, and moral movement known as multiculturalism has been enormously influential in psychology. Its ability to reshape psychology has been due to its ethical force, which derives from the attractiveness of its aims of inclusion, social justice, and mutual respect. The cultivation of cultural competence, presented as a developmental process of acquiring self-awareness, cultural knowledge, and skills, is an important emphasis in the multicultural literature. The authors place the cultural competence literature in dialogue with virtue ethics (a contemporary ethical theory derived from Aristotle) to develop a rich and illuminating way for psychologists to understand and embody the personal self-examination, commitment, and transformation required for learning and practicing in a culturally competent manner. According to virtue ethics, multiculturalism can be seen as the pursuit of worthwhile goals that require personal strengths or virtues, knowledge, consistent actions, proper motivation, and practical wisdom. The authors term the virtue of multiculturalism openness to the other and conclude by describing how attention to cultural matters also transforms virtue ethics in important and necessary ways. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
9.
Butler Stephen F.; Newman Frederick L.; Cacciola John S.; Frank Arlene; Budman Simon H.; McLellan A. Thomas; Ford Sabrina; Blaine Jack; Gastfriend David; Moras Karla; Salloum Ihsan M.; Barber Jacques P. 《Canadian Metallurgical Quarterly》1998,10(4):399
The Addiction Severity Index (ASI) is a reliable and valid measure of problem severity among addicted patients. Concerns have been raised about the reliability of the Interviewer Severity Rating (ISR), a summary score for each of 7 domains. As part of an effort to build a computer-administered ASI, regression equations were developed to predict the ISR. Repeated resampling of a large dataset, consisting of 1,124 ASIs conducted by trained interviewers, permitted derivation of stable regression equations predicting the ISR for each ASI domain from patients' answers to preselected interview items. The resulting 7 Predicted Severity Ratings (PSRs) were tested on 8, standardized vignettes, with "gold standard," expert-generated ISRs. Reliabilities compared well with those of intensively trained interviewers. The PSRs could provide an alternative to potentially unreliable interviewer ratings, enhancing the ASI's role in treatment planning and treatment matching and make possible a computer-administered version of the ASI. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
10.
This paper presents the results of a study of the software complexity characteristics of a large real-time signal processing system for which there is a 6-yr maintenance history. The objective of the study was to compare values generated by software metrics to the maintenance history in order to determine which software complexity metrics would be most useful for estimating maintenance effort. The metrics that were analyzed were program size measures, software science measures, and control flow measures. During the course of the study two new software metrics were defined. The new metrics, maximum knot depth and knots per jump ratio, are both extensions of the knot count metric. When comparing the metrics to the maintenance data the control flow measures showed the strongest positive correlation. 相似文献