This paper briefly reviews the latest progress in the analyses of the technologies for artificial hip joints; and in the researches directed to the features of UHMWPE debris obtained from all kinds of experimental conditions, to the wear process and wear mechanism, and to the factors which influence the wear mechanism. Furthermore, the signification of debris atlas was illustrated. Finally, future directions to be furthered were considered and envisaged. It is suggested that emphases be laid on the relationship between the UHMWPE debris feature and the wear mechanism, and be laid synergistic effects of biochemical environment and loading environment so as to establish the predictive wear models of artificial hip joints.
Arthroplasty, Replacement, Hip ; adverse effects ; Equipment Failure Analysis ; methods ; Foreign Bodies ; etiology ; prevention & control ; Humans ; Particle Size ; Polyethylenes ; adverse effects ; analysis ; Prosthesis Failure

ObjectiveTo find incidence rate of no-suicide self injury (NSSI) of junior school students in Dalian city,and to provide some evidences for interventions for them.MethodsRandomly drawn out 1463 junior school students were served as study objects.All objects were evaluated with Ottawa Self-Injury Inventory (OSI) and self-made investigate questionnaire,75 no-suicide self-injury were screening out.ResultsThe incidence ratio of NSSI of junior school students was 5.4％,there were no significant different between the male and female students.The highest incidence ratio was found at 13 years old.The average age for first-time self-harm was (12.24±1.344) years old.There were no significant different between the male and the female students( t=- 1.415,P =0.163 ) ; Cutting Skin was the most common way of NSSI ( 12.0％ ) ; Ideation of 80％ of the NSSI was from their Own Idea.2.7％ of the NSSI can Feel Relief through NSSI behavior.93％ of NSSI was to regulate their mood.100％ students of NSSI against NSSI behavior byReading Books or Listening Music,in which 60％ of NSSI believe the method was helpful to relax their mind.78.5％ of the NSSI resisted NSSI behavior by Watching TV or Playing Games,but they did not get enough effects.60％ NSSI considered themselves without the need to treat.41.3％ of NSSI had never been to treat.2.5％ of NSSI went to hospital for the wound.ConclusionNSSI is often be found in junior school students,and highest ratio is at 13 years old.The most common method of NSSI is Cutting Skin.More NSSI aim is to release their emotion,and self-injury behavior accordance with their inner thoughts.NSSI behavior often is secret,and reading and listening to music is cut off from the relative effective way to conduct.NSSI are seldom to initiative doctor,and education organ,parents and society in a three-dimensional one of the system is necessary.

Objective To find some risk factors correlated with test anxiety of middle school students,and to find out influencing pathway for test anxiety. Methods 647 middle school students were investigated with Sarason' Test Anxiety Scale (TAS), Achievement Motivation Scale (AMS), Coping Style Scale for School Students ( CSS), Eysenck Personality Questionnaire( EPQ), Egma Minnen av Bardndosnauppforrestran(EMBU) and Family Environment Scale-Chinese Version(FES-CV). Statistics were done with version of SPSS14.0,and data were analyzed by Pearson correlation, multiple linenear stepwise regression and path analysis. Results The rates of test anxiety respectively was mild 25.97% ,moderate 45.65% ,severe 28.38%; there were no significant different between the male and female students anxiety ( 16.71 ± 6.44,17.01 ± 7.02, t = 1. 469, P = 0.334). Test anxiety positively correlated with Achievement motivation, reach motivation of competition, endurance, escape, expos, deny the fantasy,family conflicts,parental punished severely,excessive interference,objective deny,overprotective of father.( r 1-16 :0. 214,0. 135,0. 254,0. 216,0. 308,0.472,0. 492,0. 168,0. 249,0. 537,0. 282,0. 102,0. 238,0. 185,0. 233,0.301,0.273; P 1-16 = 0. 000 ～ 0. 030) , and negatively correlated with Problem-solving, rationalizing interpretation, family cohesion, informative, entertaining, emotional expression, organization, parental warmth and understanding ( r1-9: -0. 121, -0. 134, -0. 178, -0. 215, -0. 221, -0. 101, -0. 298, -0. 136, -0. 168; P 1-9 =0.000 ～0.007). Enter test anxiety regression equation is the reached motivation of competition,emotional expose,organization, psychosis, Neuroticism, parent's warm and understanding , mother's refuse and deny ( t 1-7: 2.496,2.521, -2.687, -2. 150,3.503,2.237,2.259; P1-7 =0.001 ～0.038). Conclusion Test anxiety is commonly find in middle school students. Test anxiety is affected by some paths that are personality,achievement motivation,emotional coping style,family environment and parental education methods.

Objective To discuss the personality characteristic and personal social attributes of junior middle school students of online violent games addictive disorder (VOGAD).Methods From August to December at 2008,6000 students were randomly drown from 8 junior middle schools in Dalian ,then they were investigated with the self-made internet game survey form and the Chen internet addiction scale (CLAS).149( 2.5% ) internet game addicts were screen out from 6000 students, and were divided into the violence and entertainment game addicted group ( 66 students in per group,and the male is 55, female is 11 ).Average age was ( 14.36 ± 0.81 ) years old.No-play game group 66 students were mach according to the sex and the age.All objects were evaluated with Eysenck personality questionnaire (EPQ) and Minnesota Multiphasic Personality Inventory Abbreviation Form (MMPI-AF).Results There were significant different during the 3 groups in psychoticism (50.60 ± 5.10;50.40 ± 6.30; 46.81 ± 4.62 ), neuroticism ( 51.74 ± 5.70; 49.03 ± 6.85; 49.25 ± 6.09 ) , manifest anxiety (55.29 ±9.58;45.11 ±8.31; 43.24 ±8.32) ,dependence (58.90 ±9.09; 55.97 ±8.63; 54.05 ± 11.39) ,and social responsibility ( 37.47 ± 12.41; 43.25 ± 11.24 ;46.34 ± 14.37 ) (F1-5 = 10.32,3.83,36.17,4.11,8.23; P 1-5 ＜ 0.05 ).Except of the social responsibility (P＞ 0.05 ) ,above results all suggested higher scores in the VOGAD group than other two groups (P1 ＜ 0.05 ).Conclusion The results suggest higher scores in the psychoticism, neuroticism, dependency, manifest anxiety in VOGAD group, and lower Re in online violence game addict students.

Objective To discuss family environment and parent's education pattern of violent online games addictive disorder in junior middle school students. Methods From August to December at 2008,6000 students were randomly drown from 8 junior middle schools in Dalian. All subjects were investigated with the self-made internet game survey form and the Chen internet addiction scale (CLAS). 149(2.5% ) internet game addicts were screen out from 6000 students, and then were divided into the violence and entertainment game addicted group (66 students in per group, and the male 55, female 11). No-game group 66 students were matched according tothe sex and the age. All subjects were evaluated with Egma Minnen av Bardndosnauppforstran ( EMBU) and Moss's Family Environment Scale of Chinese version. Results Lower mother's understand and warm were observed in violence internet online game addictive student group than other two groups( (46. 37 ± 13. 93,49. 80 ± 7.13,53. 16 ± 14. 89) , F = 4.88, P<0.01) ,and the mother understand and warm were remarkably lower in the violence online game addictive group than the non-game addicted group(P<0.01) ,and mothers rejection and the denial are obviously higher in entertainment online game addictive group than the non-game group(P = 0. 038). In family environment survey results suggested there were significant different during the 3 groups (F1-3 = 13. 99, 12.24,10.56; P<0.05)in emotion expression(4. 74 ± 1. 32,6. 06 ± 1. 97,5. 80 ± 1. 11) ,and conflict (5. 57 ± 1.85,5.28 ± 1.41,3.63 ± 1.50) .independence (3.96 ± 1. 87,4.56 ± 1.84,4.63 ± 1. 85). In the violence online game addictive group, emotion expression was lower than other two groups (P<0. 01) ,the conflict score was higher than other two groups (P<0.01). The controlling was lower than other two groups ( all P<0. 01) ; family function and total score are lower in online game addictive groups than other groups (P<0. 01, P<0. 05). Conclusion -Lower emotion expression,higher conflict,lacks of mother's love and warm,and lower controlling are found in violence online game addictive junior middle school students.