Cambridge International Publishing
Not a member yet
190 research outputs found
Sort by
The study of psychosocial characteristics of youth with internet addiction
Get PDFObjective: To explore the mental health status, coping styles, personality traits, and time management tendencies of adolescents with internet addiction, providing a theoretical basis for the mental and physical health education of these youth. Methods: A total of 2,784 students were screened for internet addiction using an internet addiction test questionnaire. Of the 80 identified internet addicts, 77 students were designated as the study group, and 80 students without a tendency towards internet addiction were selected as the control group. Both groups were evaluated using the Symptom Checklist-90 (SCL-90), the Simplified Coping Style Questionnaire (SCSQ), the Eysenck Personality Questionnaire (EPQ), and the Adolescent Time Management Disposition Scale (ATMD). Results: The rate of internet addiction among adolescents was 3.1%. Except for the paranoid and psychotic factor scores, the study group\u27s SCL-90 scores in the remaining eight factors were significantly higher than those of the control group (P<0.01). The active coping dimension score of the SCSQ was significantly lower in the study group than in the control group (P<0.01), while the passive coping dimension score was significantly higher (P<0.01). The introversion and neuroticism dimension scores of the EPQ were significantly lower in the study group than in the control group (P<0.01), while the psychoticism dimension score was significantly higher (P<0.01). The ATMD scores for time value, time monitoring, and time efficacy were all significantly lower in the study group than in the control group (P<0.01). Conclusion: Adolescents with internet addiction have poor mental health status, a more negative problem-solving approach, introverted and reclusive personality types, and unreasonable time management
Studies on activity and oxide shell thickness of micron-sized Mg-Al alloy powder
Get PDFThe empirical formula of average oxide thickness of atomized micron-sized aluminum - magnesium alloy powder was proposed. At the same time, the influence of particle size and the ratio of magnesium on samples’ activity was studied. The phase composition, morphology, and oxidation process of the alloy powders were studied by x-ray diffraction, scanning electron microscope/energy-dispersive x-ray, respectively. Study on the change of powder activity was achieved by standard gas volumn method. The results show that the oxide thickness of the atomized micron-sized aluminum - magnesium alloy powder is positively correlated with the particle size, and the activity decreases with the increase of the particle size and the magnesium content
Data mining on uncertain data based on frequent probability
Get PDFUncertain data exists in many applications, such as sensor monitoring systems, location-based services, and biological databases. To handle a large amount of uncertain information, probabilistic databases have been proposed. The main research involves interpreting probabilistic databases using possible world semantics and discovering frequent patterns within probabilistic databases. Since the possible worlds in probabilistic databases grow exponentially, this mining process is a technical challenge
Exploration of Teaching Principles from the Perspective of Exercise Physiology Knowledge
Get PDFExercise physiology is a science that studies functions and mechanisms, and its knowledge contains many principles and methods. These principles and methods are not only applied to the teaching of physical education classes, fitness guidance, and sports training, but also, many principles can be reflected to guide the teaching process and design of exercise physiology courses and other theoretical courses
Research on the movement injury for tennis major students of universities
Get PDFIn recent years, tennis has increasingly become a favorite sport for many people, and major institutions of higher learning across the country have established specialized tennis courses. As the number of tennis enthusiasts grows, more and more individuals have sustained injuries for various reasons during the sport, which has adversely affected their studies and daily work. Consequently, preventing injuries in tennis has become one of the vital components of specialized tennis courses. This article scrutinizes the characteristics of injuries among students participating in tennis, analyzes the causes of these injuries through surveys, and proposes preventive measures tailored for tennis-related injuries. It offers a theoretical foundation for students majoring in tennis and enthusiasts, aiming to minimize physical injuries during tennis activities
Thermal enhancement of the oxidation layer of micron-sized aluminum powder and its anti-oxidation performance
Get PDFMicron-sized aluminum powder, with its typical core-shell structure, exhibits oxidation behavior upon slow heating in an oxidative atmosphere that is related to the particle size of the aluminum powder. A particle size-dependent thermal response mechanism for micron-sized aluminum powder is established: a "shell-breaking eruption" thermal response mechanism. The oxide layer is thermally enhanced, and the anti-oxidation reaction behavior mechanism of the enhanced samples is studied. Aluminum powder samples, heated slowly to specific temperatures to obtain changes in the oxide layer structure, are analyzed using a thermal analyzer to compare the slow heating response behavior of aluminum powder before and after the oxidation layer changes. It was found that after thermal enhancement of the aluminum powder oxidation layer, which changed from amorphous to γ-phase and whose thickness increased to twice the original thickness, the slow oxidation process of micron-sized aluminum powder was inhibited, and the aluminum powder was completely deactivated in the slow heating response
Esterification catalytic over Imidazolium Ionic Liquid Modified salt of phosphotungstic Acid catalyst
Get PDFA solid acid was prepared by the reaction of phosphotungstic acid (HPW)with 1-methy- limidazolium sulfobutyrolactone (MIMSB) and characterized by the methods of X-ray powder diffraction, FT-IR, potentiometric titration and SEM. Then the solid acid was employed for esterification to evaluate its acid-catalytic activity. Various reaction parameters, including catalyst dosage, reaction time, n-butanel/butyric acid molar ratio and reaction temperature were systematically examined. These results indicated that the prepared catalyst maintained the Keggin structure of the raw HPW, and had high acidity. The catalyst exhibited excellent catalytic activity in esterification of n-butyric acid and n-butanol.93. 4% conversion of n-butyric acid was obtained under the optimized reaction conditions. The catalyst also had good stability
Rapid quantitative determination method of four heavy metals in strawberry
Get PDFA rapid quantitative determination method of mercury, arsenic and arsenic, cadmium and chromium in strawberry was established. The sample to be tested was prepared into the solution to be tested, and the content of mercury, arsenic, cadmium and chromium were determined respectively on the machine. The results showed that the correlation coefficient of the standard curves of the four heavy metals was within 0.9961.000, and the detection limit was 0 mercury 0.028 g / kg, arsenic 0.062 g / kg, cadmium 0.14 g / kg, chromium 4.76 g / kg; the recovery was 80.2% 108.3% and 1.58% 26.34%; the test results of the standard samples were within the standard value. The method established in this experiment can determine the four heavy metals of mercury, arsenic, cadmium and chromium, etc. It has good linear correlation, low detection limit, good accuracy, high safety, simple operation, batch processing, and saves reagent consumables and detection time
Editing standards for titles of figures and tables in scientific papers with examples
Get PDFTitles of figures and tables in scientific papers are characterized by self-evidence and conciseness. Based on the standards for editing and processing titles of figures and tables, this paper categorizes common issues with titles that do not meet the standards in scientific papers and selects typical examples. It points out problems such as missing modifiers and redundant references in the titles of figures and tables, and provides the correct forms of expression for them
Hu Shi\u27s Literary Evolution From \u27Fifty Years\u27 to \u27Modern Series
No full textWritten only five or six years after the New Culture Movement, Hu Shi documented this great literary revolution with a plain and objective attitude in "Fifty Years of Chinese Literature." More than a decade later, when Hu Shi was in charge of compiling the "Construction Theory Collection" for the "Great Series of Modern Chinese Literature," the preface he wrote had changed in many aspects. The reason for this is the evolution of Hu Shi\u27s concept of literary history, such as his treatment of classical Chinese literature, the relationship between vernacular and classical Chinese, and the attitude towards the content of the vernacular movement. By comparing these two books, one can gain a clearer understanding of Hu Shi\u27s literary historical perspective