Fixed-point constructions in order-enriched categories

The fixed-point construction of Scott, giving a continuous lattice solution of equations X ? T(X) where T is an endofunctor on the category of continuous lattices, is extended to categories enriched by partial orderings on the morphism sets. The result allows data structures to be realized not only in the category of continuous lattices, but also in the category of complete lattices, in the category of complete partial orders, or in any of several related categories of partial orders.     

The unity of the discipline: A challenge for the profession.

Examines the issue of disunity within the discipline of psychology, within the profession of psychology, and between the two. References are made to tensions that have existed in or between academic/scientific and applied/professional psychology throughout the history of psychology in Canada and the US. The emphasis, however, is on more recent events and their implications for the profession of psychology in the immediate future. Factors are identified within the discipline and the profession, and in society that could operate to strengthen the links between professional and academic psychology. A shortened French version of the article is also presented. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The mystery of the tower revealed: A nonreflective description of the reflective tower

In an important series of papers [8, 9], Brian Smith has discussed the nature of programs that know about their text and the context in which they are executed. He called this kind of knowledgereflection. Smith proposed a programming language, called 3-LISP, which embodied such self-knowledge in the domain of metacircular interpreters. Every 3-LISP program is interpreted by a metacircular interpreter, also written in 3-LISP. This gives rise to a picture of an infinite tower of metacircular interpreters, each being interpreted by the one above it. Such a metaphor poses a serious challenge for conventional modes of understanding of programming languages. In our earlier work on reflection [4], we showed how a useful species of reflection could be modeled without the use of towers. In this paper, we give a semantic account of the reflective tower. This account is self-contained in the sense that it does not employ reflection to explain reflection.     

Sex differences in referrals to a rehabilitation facility for the physically disabled: A research note.

Sex ratios for inpatient and outpatient referrals to a Department of Rehabilitation Medicine and to its psychological services were examined for six general diagnostic categories of injury and disease and compared with known proportions of males and females in the population in these categories. Of the diagnostic categories, only referrals of patients suffering from cerebral vascular accident (CVA) revealed sex ratios significantly different from population estimates. Problems in interpreting the statistics and in judging the adequacy of the estimated sex ratios, which may be confounded by differential age expectancies, were disclosed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

硬质合金钎焊接头的拘束强化

从力学观点分析了高温高压扩散处理硬质合金钎焊接头的拘束强化效应。文中指出，钎焊接头受力时，钎缝的拘束应力状态与双边半圆缺口平板中的应力状态相类似，据此，在一定范围内建立了钎缝宽度与接头强度间的定量关系，为通过控制钎缝宽度以提高接头强度提供了依据。     

Amidoamine: Synthesis,disparity in cure with epoxy resins between bulk and solvent systems,and structure–property relationships of its epoxy‐based coatings

Amidoamines are widely used as crosslinkers for epoxy resins in protective coatings on metal substrates; however, their cure chemistry is not well elaborated in the technical literature. During cure, the epoxy–amine and epoxy–amide NH reactions could be accompanied by epoxy–hydroxyl etherification, epoxy–epoxy homopolymerization, and reaction between hydroxyls and amide moiety to form in situ ester and amine. To understand the epoxy–amidoamine cure chemistry and correlate it with coating performance properties, amidoamines of known structure are required. Therefore, amidoamines were synthesized by reacting dimer fatty acids with diethylene triamine. When these amidoamines were cured with epoxy resins, discrepancies were observed between systems cured at ambient and thermal conditions. The presence of solvents were seen to greatly affect the rate of epoxy–amidoamine cure at ambient, and before and after vitrification. Near‐IR and mid‐IR spectroscopy studies indicated that side reactions occurred to some extent during cure. No reaction was noted between the amide NH moiety and the epoxide group below 150°C whereas ester formation was noted above 120°C. Solvent‐based clear epoxy–amidoamine coatings formulated at an epoxy:amine equivalent ratio 1.15 passed basic organic coatings evaluation tests. POLYM. ENG. SCI., 59:E69–E81, 2019. © 2018 Society of Plastics Engineers     

Assessment of particle retention and clearance in the intrapulmonary conducting airways of hamster lungs with the fractionator1

A modified version of the fractionator was used to estimate the total number of polystyrene microspheres retained in the airways of hamster lungs at two different time points after inhalation. A systematic three-stage subsampling procedure with known sampling fractions was adopted. First, each lung was cut into slices, from which primary disectors were sampled systematically with a known sampling fraction. From each primary disector, smaller sub-disectors were subsampled, and the corresponding sampling fraction was estimated by point counting. Finally, a few particles were counted at the microscopic level in the sub-disectors, and the final estimate of total particle number (which is unbiased irrespective of any tissue deformations) was easily computed as a product of the counted number times the reciprocal of the successive sampling fractions. The error variance of each estimate was assessed from the data using a new estimator. An average of 6% of the deposited particles were retained on the epithelial surface of the intrapulmonary conducting airways shortly after the inhalation, from which at least one-third was already phagocytosed by macrophages. After 24 h, an average of 87% of the particles retained shortly after the inhalation had been cleared. The proportion of particles ingested by macrophages had increased to at least 87%, in three out of four animals studied.     

Real-time phase-front detector for heterodyne interferometers

We present a real-time differential phase-front detector sensitive to better than 3 mrad rms, which corresponds to a precision of approximately 500 pm. This detector performs a spatially resolving measurement of the phase front of a heterodyne interferometer, with heterodyne frequencies up to approximately 10 kHz. This instrument was developed as part of the research for the Laser Interferometer Space Antenna Technology Package interferometer and will assist in the manufacture of its flight model. Because of the advantages this instrument offers, it also has general applications in optical metrology.