基于EDA技术的多功能等精度数字频率计的设计

在对三种测频方法进行分析的基础上,介绍了基于EDA技术的等精度测频原理.给出采用AT89C51实现控制并通过FPGA来设计多功能等精度数字频率计的具体方法.该频率计可以兼顾频率计对速度、资源和测频精度等各方面的优化需求.     

Oxidative stress and antioxidants in tubercular meningitis

Oxidative stress is implicated in the etiopathogenesis of a variety of human diseases. Therefore, in the present study, erythrocyte lipid peroxidation, percentage hemolysis, antioxidant enzymes viz., glutathione reductase, glutathione peroxidase, superoxide dismutase and plasma antioxidants viz., ceruloplasmin, vitamins A,E and C have been determined in 19 patients with tubercular meningitis (TBM) and 50 normals. Six patients who were treated with antibiotics were considered for the follow up. The statistical analysis was carried out by Mann Whitney U test and Wilcoxon rank sum test. Lipid peroxidation (P<0.02), percentage hemolysis (P<0.001) and plasma ceruloplasmin (P<0.0001) of TBM patients were significantly higher, whereas erythrocyte glutathione reductase (P<0.05) and plasma antioxidant vitamins A, E and C (P<0.01, P<0.05 respectively) were significantly lower than those of the controls. In the follow up patients the glutathione reductase and catalase levels were significantly high (P<0.05) compared to their pre-treated condition. Vitamin C and E levels have attained normal range. This study indicated that the blood antioxidant status of TBM patients which was low compared to controls improved after treatment, suggesting the role of free radicals in TBM.     

Two cases of hereditary fructose intolerance

Hereditary fructose intolerance is a rare cause of hepatic cirrhosis in the young. The disorder has a reported frequency of 1 in 20000 live births and no case has been reported from India so far. We report two cases of hereditary fructose intolerance, both with bilateral cataracts and one with cirrhosis of the liver.     

A three-dimensional solution for plates and laminates

A general three-dimensional solution is presented for statics and dynamics of plates, homogeneous or laminated, of orthotropic materials. The solution is in series form. Using parts of the general solution a variety of problems, especially of rectangular configurations, can be solved. As Mindlin's approximate analysis for vibration of thick plates is often adequate for specific practical purposes, a general solution for Mindlin's analysis is also given.     

A distribution of impact factors of journals in the area of software: An empirical study

Data from two bibliographic databases i.e. COMPENDEX and INSPEC have been collected on the broad subject software and related topics. The titles of the journals were extracted from the database. The impact factors of the titles were also collected in order to study the distribution of impact factors. An attempt has been made to identify a suitable model to describe a distribution of impact factors. It has been observed that a Gamma distribution fits the observed data very well with one of the parameters as mean of the distribution and other parameter as 1. Further it has been observed that the researchers are now publishing their articles in high impact factor journals.     

Maternal and fetal indicators of oxidative stress during intrauterine growth retardation (IUGR)

The present study demonstrates the possibility of increased lipid peroxidation and protein oxidation in both maternal and fetal erythrocytes as markers of oxygen radical activity during intrauterine growth retardation. The erythrocyte MDA levels were significantly elevated in mothers of IUGR babies when compared to controls (p<0.01). The endogenous protein damage due to oxidative stress was significantly higher in IUGR mothers when compared to controls (p<0.05). Similarly the proteolytic activity in erythrocyte lysates against oxidatively damaged hemoglobin was significantly increased in mothers of IUGR babies compared to controls (p<0.001). In fetuses born with IUGR, both lipid peroxidation and proteolytic activity were significantly increased when compared to normal newborns (p<0.01). The result of this study indicates that oxidative stress was induced both in IUGR babies and their mothers which is manifested as increased lipid peroxidation and protein oxidant damage.     

走出困惑:"档案职业边缘化"的质疑与反思

一、质疑:"档案职业边缘化"? 近年来,律师边缘化、股市边缘化、学术(者)边缘化、文学(作家)边缘化等转眼间让"边缘化"成了"红人",不少人在为这种种的"边缘化"扼腕叹息.与此同时,档案学界也出现了"档案职业边缘化"的提法,对此笔者不敢苟同.     

Classroom goal structures: Observations from urban and rural high school classes in China

This study reports on the goal structures of one rural and one urban Grade 11 class in China, based on classroom observations and teacher and student interviews. Classroom observations, conducted over a 6‐month period, focused on physical settings and classroom activities. In each class, seven students and the homeroom teacher were interviewed to discern their views about classroom goal structures. Results indicated that although high scores and rankings on tests were admired, students were also encouraged to master knowledge, exert effort, develop good habits, and learn from their errors, reflecting the coexistence of both mastery and performance goals. Comparisons revealed that the rural class had a predominantly examination‐oriented focus whereas the urban class did not place as great importance on examination outcomes. Implications of the findings for research and practices are discussed.     

Academic achievement and personality traits of faculty members of Indian agricultural universities: their effect on teaching and research performance

Purpose: The present study was undertaken to assess academic achievement, teaching aptitude and research attitude of Indian agricultural universities’ faculty, to predict indicators for successful teachers and researchers, and thereby enhancing the quality of higher agricultural education. Methodology: Five hundred faculty members were selected to elicit information on academic, teaching and research achievements. Teaching aptitude and attitude of faculty towards research were measured through standard psychometric tests. Correlation and regression analysis was carried out to establish the relationship among selected variables. Findings: Combination of academic achievement and teaching aptitude was a superior predictor for the teaching achievement compared to either of them alone. Similarly, research achievement of faculty was predicted better by the combination of academic achievement and research attitude. Practical Implications: The study showed the need for training faculty members in interpersonal relationships for effective teaching, and in research methodology and research processes for improving research attitude of faculty. Theoretical Implications: The expectancy-value model provides a useful framework to understand the role of attitude/aptitude in better prediction of research and teaching behavior. Originality/Value: The present study showed that teaching aptitude and research attitude be considered along with academic achievements for promoting quality teaching and research and hence the educational programmes.     

Components of Early Childhood Interagency Collaboration: Results of a Statewide Study

This article describes the results of a comprehensive statewide study of early child- hood service providers in a heavily populated midwestern state. Interagency collaboration among early childhood programs and agencies providing services for special needs preschoolers is now required through the passage of Public Law 99-457. Special needs children aged 3 to 5 years are being placed in early childhood education sites, such as public schools, nursery schools, Head Start programs, child care settings, and other preschool/child development environments. This statewide survey investigates existing interagency collaboration efforts, studies factors related to successful collaboration, identifies inhibitors to early childhood collaboration, and determines possible interagency collaboration training needs of early child- hood service providers. Results indicate that training needs for early childhood service providers do exist in the area of interagency collaboration. Implications are identified that relate to teacher preparation and in-service needs regarding integration of special needs children into regular early childhood settings. The study is a part of the state- funded research related to the implementation of EL. 99-457 in school districts and existing early childhood community-based programs.