Characterization Classes Defined without Equality

In this paper we mainly deal with first-order languages without equality and introduce a weak form of equality predicate, the so-called Leibniz equality. This equality is characterized algebraically by means of a natural concept of congruence; in any structure, it turns out to be the maximum congruence of the structure. We show that first-order logic without equality has two distinct complete semantics (fll semantics and reduced semantics) related by the reduction operator. The last and main part of the paper contains a series of Birkhoff-style theorems characterizing certain classes of structures defined without equality, not only full classes but also reduced ones.     

Alcohol First Use and Attitudes Among Young Children

We describe the attitudes and first use of alcohol by children, grades 3-6, who participated in the Bogalusa Heart Study, 1993-94. Questionnaire data reflected that more than one-third of the children had experimented with alcohol at the time of the study. The dominant environmental factor in experimentation was family modeling, and the dominant personal factor was curiosity, regardless of race, gender, or grade. Most children believed that alcohol use can lead to accidents, that drinking has negative social consequences, and that alcohol use hurts only if done to excess. Indications are that young children generally have negative attitudes regarding alcohol use, and that public and family alcohol education efforts need to be more specific about deleterious effects of even low levels of alcohol use in the young.     

两种参照作用下的视觉定位

本实验采用多点视觉定位作业,研究视觉定位中的两种参照对定位成绩的影响。实验采用一些附加线条与三个刺激形成有特征的刺激图和无特征的刺激图,并与没有附加线条的情况进行了比较。有特征的刺激图是指这些附加的线条与刺激点构成一定的特征,如一个字母或图形等;无特征的刺激图指刺激点不能与附加线条构成有规律的特征。结果发现,当有附加线条的图形呈现时,被试的定位误差大于控制组,表现出一级参照对视觉定位的干扰作用,而且在呈现时间为100ms、200ms、300ms时,都是如此。在有特征组内,不同的特征对定位精确性的影响依赖于时间因素。     

Evidence of a detrimental effect of extrinsic incentives on breaking a mental set

College students were either rewarded ($1.50) or not for solving a series of 10 water-jar problems. The first 9 of these were designed to establish a set for a relatively complicated, three-jar solution (B ? A ? 2C). The 10th problem was a set breaker which required that subjects discover a simple (A-C) solution. The mental activities needed to produce a solution to the two types of problems (Problems 1 to 9 and Problem 10) were, therefore, different and one interest was in seeing whether reward would be detrimental for performance on both types of problems. It was not. Poorer reward group performance was obtained only on Problem 10. This result was not due to between-group differences in mathematical ability, and explanations in terms of differences in time taken to check answers or concern over quality of performance were considered and discounted. Measures of intrinsic interest (subject evaluations of the task and a measure of willingness to volunteer for future research) failed to support the belief that interest differences account for performance differences.     

Recipient mood states and helping behavior

Three studies investigated the effects of perceived recipient mood on helping behavior. Based upon Schwartz' (in Advances in experimental social psychology, Vol. 10, N.Y.: Academic Press, 1977) discussion of need-based helping, it was predicted that donors would perceive greater psychological need and would help more when the recipient's mood was negative than when it was neutral. These predictions were confirmed for females but not for males. The results also confirmed the hypothesis, derived from Schwartz (1977), that a negative recipient mood would elicit greater helping than a neutral recipient mood when this mood is perceived as changeable but not when it is perceived as unchangeable.     

Increasing and decreasing intrinsic interest with contingent rewards: A test of cognitive evaluation theory

The study examined Deci's (Deci, E. L. Intrinsic motivation. New York: Plenum Press, 1975) hypotheses regarding the effects of contingent rewards on intrinsic task interest. Seventy-two male university students worked on a series of puzzles and were given either a high value reward ($1.50) or a low value reward ($.45). The money was given either contingent upon the simple execution of the task (task-contingent), contingent upon the ostensible attainment of a performance criterion level (criterion-contingent), or noncontingent and unexpected (control). Compared to the high payment control subjects, subjects who received the task-contingent high reward rated the task as less interesting, while subjects who received the criterion-contingent high reward rated it as more interesting. Also, subjects expressed less interest in the task after receiving the high task-contingent reward than the low task-contingent reward, but indicated greater interest after receiving the high criterion-contingent reward than the low criterion-contingent reward. It was concluded that substantial support was obtained for Deci's (1975) cognitive evaluation theory.     

Developmental differences in recall: Encoding or retrieval?

First- and fifth-grade children and college adults (ages 6, 10, and 18 years, respectively) were presented a 30-item set of pictures to recall in a 4-trial study-test procedure. The stimuli were presented in one of three ways (encoding condition): randomly, blocked (according to categories), or sort (the subject was given the stimuli in random order and asked to sort them into categories). Recall was either free, cued, or constrained (retrieval condition). Results indicated that maximum adult recall was a function of the interaction of encoding and retrieval conditions, and that first- and fifth-grader's recall was influenced by retrieval conditions but not by encoding conditions. The blocked and sort encoding conditions did result in increased clustering relative to random encoding at all three ages, however. It was concluded that encoding conditions influence recall only as they effect the use of retrieval strategies.     

Implementation of the Sound Partners Reading Program

Eleven first grade and 10 second grade students, all with reading and behavioral difficulties, received one-on-one tutoring using the Sound Partners reading program (Vadasy & Pool, l997). Students received 30 min of tutoring each day for 5 months. Students were assessed on Letter-Word Identification, Passage Comprehension, and Word Attack subtests of the Woodcock-Johnson-Revised (WJ-R): Tests of Achievement. An informal measure (rapid letter naming) was also used. Results indicated that gains of approximately 1 standard deviation (or greater) were noted for subtests of the WJ-R for first-grade students; second graders showed relatively stable performance from pre- to posttest assessments. Similar performance was noted on the informal measure across grades. Program satisfaction data showed that overall the tutors, teachers, and students were pleased with the program. Discussion focuses on the implications for future investigations.     

Peirce on Education: Nurturing the First Rule of Reason

Through an exegetic reading of Peirce’s minor texts on higher education, I find that Peirce’s conception of a “Liberal Education” is close to the Herbartian conception of Bildung. Peirce calls for a general education with the ambition of qualifying critical thinkers with the capacity to go beyond the strict rules and narrow borders of the artes liberales, – the different subject matters or sciences taught at a university. Thus, Peirce’s conception of a liberal education is closely linked to his interpretation of common sense – or sensis communis – as a critical commonsensism. To him, it is urgent to educate and nurture “the first rule of reason,” described as a will to learn, a curiosity, a dissatisfaction of what you already incline to think, and an intense desire to find things out. The nurturing of this “first rule of reason” is thus about educating an intellectual community of critical thinkers who are able to question authoritative beliefs, knowing how to debunk them, and how to turn away from obiter dictum.     

糖尿病酮症酸中毒急救措施

辩证思维是最重要的科学思维方法,是指导临床工作的重要科学方法。糖尿病酮症酸中毒（DKA）为糖尿病的急性并发症,是导致糖尿病死亡的主要原因之一。在临床诊治过程中,应科学合理运用辩证思维方法,对DKA快速正确地诊断,积极及时地救治,从而降低糖尿病的病死率,提高患者的生存质量。