The oxidation behavior of Ti?22Al?(27?x)Nb?xZr (x=0, 1, 6) alloys at 800 °C for exposure time up to 100 h was examined. It is shown that oxidation rate of experimental alloys obeys the parabolic kinetics. Ti?22Al...The oxidation behavior of Ti?22Al?(27?x)Nb?xZr (x=0, 1, 6) alloys at 800 °C for exposure time up to 100 h was examined. It is shown that oxidation rate of experimental alloys obeys the parabolic kinetics. Ti?22Al?26Nb?1Zr alloy demonstrates more excellent oxidation resistance than the other two alloys. The main oxidation products are TiO2, Al2O3 and AlNbO4 phases for all these alloys. For the Ti?22Al?26Nb?1Zr alloy, Zr addition can modify the growth mechanism of oxide scale, which can effectively hinder the diffusion of oxygen. Whereas, reaction of Zr with oxygen leads to the formation of ZrO2 precipitates for the Ti?22Al?21Nb?6Zr alloy, which promotes the oxygen ingress into the substrate. Meanwhile, oxidation affected zones, including internal-oxidation layer and oxygen-enriched zone, are present beneath the outmost oxide scale. The difference in these zones is derived from the phase constitution in the starting Ti?22Al?(27?x)Nb?xZr (x=0, 1, 6) alloys.展开更多
Objectives: To investigate prevalence and risk fac-tors of syphilis infection among injection drug users(IDUs) in Lianshan Yizu Autonomous Region ofSichuan province, China.Methods: From November 8th 2002 to November29...Objectives: To investigate prevalence and risk fac-tors of syphilis infection among injection drug users(IDUs) in Lianshan Yizu Autonomous Region ofSichuan province, China.Methods: From November 8th 2002 to November29th 2002, a community-based cross-sectional surveywas conducted to investigate the demographic charac-teristics and sexual behaviors of a population of IDUs.Blood samples were collected to test for syphilisinfection. A total of 379 subjects were recruitedfor the study through community outreach and peerrecruiting methods.Results: Of 379 IDUs, the syphilis prevalence amongIDUs was 15.3% (58/379). Gender, years of education,history of unprotected sex with non-steady sex part-ner in the last month, number of sex partners in thelast 6 months, frequency of sex with non-steady sexpartner in the last 6 months, and number of any newsex partner(s) in the last 6 months were associatedwith syphilis infection after univariate analysis usingthe chi-squared test. Multivariate logistic regressionanalysis showed that ethnicity (OR, 2.85; 95% CI,1.55-5.25), marriage (OR, 1.94; 95% CI, 1.04-3.62)and receiving money for sex in the last 6 months (OR, ,5.60; 95% CI, 2.65-11.85) were significantly associ-ated with syphilis infection among IDUs.Conclusions: This study found that receiving moneyfor sex in the last 6 months was significantly associ-ated with syphilis prevalence among IDUs. It isrecommended that further health education andintervention campaigns be focused on IDUs to promotesafe sexual practices.展开更多
The grey quasi-preferred analysis (GQPA) is one of important methods for realizing system analysis to conquer the limitations of the existing GQPA model, without any considerations to the difference of the different b...The grey quasi-preferred analysis (GQPA) is one of important methods for realizing system analysis to conquer the limitations of the existing GQPA model, without any considerations to the difference of the different behavioral factor′s importance. It could not be used to analyze the complex system with multi-hierarchy correlation factors, the weighted synthetic method for calculating abstract incidence degrees between the system beha-vioral characteristics and correlative factors in different hierarchies is given out,and the hierarchic grey quasi-preferred analysis (HGQPA) model is established. The effectiveness of the HGQPA model is tested by the scientific-technical system of Jiangsu Province. The depth and the range of the application of GQPA are developed, and the HGQPA model is regarded as a new approach to systemically analyze the complex systems with multi-hierarchy correlation factors.展开更多
AIM To investigate correlations between diet and prevalence of constipation among elderly people in Beijing.METHODS A total of 2776(≥ 60 years) were selected in Beijing region for investigation. Data regarding consti...AIM To investigate correlations between diet and prevalence of constipation among elderly people in Beijing.METHODS A total of 2776(≥ 60 years) were selected in Beijing region for investigation. Data regarding constipation and diet habits was collected via hierarchical status, segmentation and random cluster sampling. Investigation included constipation-related demographic indicators and diet habits. Door-to-door questionnaires and surveys included daily staple food intakes, frequency of fish, egg, fruits and vegetables consumption. Constipation was defined according to the China Chronic Constipation Diagnosis and Treatment Guideline(2013), with the following constipation judgment indicators: decreased defecation frequency, dry and hard stool, and difficulty in defecation.RESULTS The prevalence of constipation among elderly people in Beijing region was 13%. There was a positive correlation between prevalence of constipation and age, but negative correlations between prevalence of constipation and staple food, fish and dietary fibres(fruits and vegetables) intakes. These differences were all statistically significant.CONCLUSION The prevalence of elderly constipation in Beijing region is closely related to diet habits, and is significantly decreased by high staple foods intake, fish eating and high dietary fibres(fruits and vegetables) consumption.展开更多
Chronic heart failure and depressive disorders have a high prevalence and incidence in the elderly. Several studies have shown how depression tends to exacerbate coexisting chronic heart failure and its clinical outco...Chronic heart failure and depressive disorders have a high prevalence and incidence in the elderly. Several studies have shown how depression tends to exacerbate coexisting chronic heart failure and its clinical outcomes and vice versa, especially in the elderly. The negative synergism between chronic heart failure and depression in the elderly may be approached only taking into account the multifaceted pathophysiological characteristics underlying both these conditions, such as behavioural factors, neurohormonal activation, inflammatory mediators, hypercoagulability and vascular damage. Nevertheless, the pathophysiological link between these two conditions is not well established yet. Despite the high prevalence of depression in chronic heart failure elderly patients and its negative prognostic value, it is often unrecognized especially because of shared symptoms. So the screening of mood disorders, using reliable questionnaires, is recommended in elderly patients with chronic heart failure, even if cannot substitute a diagnostic interview by mental health professionals. In this setting, treatment of depression requires a multidisciplinary approach including： psychotherapy, antidepressants, exercise training and electroconvulsive therapy. Pharmacological therapy with selective serotonin reuptake inhibitors, despite conflicting results, improves quality of life but does not guarantee better outcomes. Exercise training is effective in improving quality of life and prognosis but at the same time cardiac rehabilitation services are vastly underutilized.展开更多
AIM： To evaluate the long-term effects of gonadotropinreleasing hormone （GnRH）-based vaccine on levels of GnRH antibody and testosterone, and vaccine-induced immunocastration on sexual behavior of male rats. METHOD...AIM： To evaluate the long-term effects of gonadotropinreleasing hormone （GnRH）-based vaccine on levels of GnRH antibody and testosterone, and vaccine-induced immunocastration on sexual behavior of male rats. METHODS： The rats were treated with GnRH-PE40 intraperitoneally every other day for 12 wk. GnRH antibody and testosterone level in rat blood were determined by EUSA and radioimmunoassay, respectively. Morphological changes in testes and sexual behavior of rats were evaluated. RESULTS： GnRH-PE40 induced a high production in GnRH antibody, decreased the serum testosterone level, testis atrophy and sexual function in rats. CONCLUSION： Intraperitoneal administration of GnRH- PE40 produces structural and functional castration of male rat reproductive system by inducing anti-GnRH antibody.展开更多
Using elementary integral method, a complete classification of all possible exact traveling wave solutions to （3＋1）-dimensional Nizhnok-Novikov-Veselov equation is given. Some solutions are new.
Nine horizon samples of three soil profiles representative of Dystri-gelic Cambisol, Fibri-gelic Histosoland Relic Ornithosol were taken from Fildes Peninsula of King George Island, Antarctica, to quantitativelydemons...Nine horizon samples of three soil profiles representative of Dystri-gelic Cambisol, Fibri-gelic Histosoland Relic Ornithosol were taken from Fildes Peninsula of King George Island, Antarctica, to quantitativelydemonstrate the enrichment, migration and loss of the elements (Si, Al, Fe, Ca, Mg, Mn, K, Na and P) insoil horizons and their behaviours within profiles by application of the concept of the enrichment coefficientcalculated in terms of the abundance of Ti. Besides, six horizon samples of 4 other profiles randomly takenfrom the studied area were examined for calculation of the redistributing enrichment coefficient, which wasapplied for a better understanding of the element redistribution between soil and clay fraction along with soildevelopment. The results showed that the enrichment, migration and redistribution of the elements variedstrongly among the investigated soils and horizons, due to the differences of weathering degrees and moisturestatus, influences of sea bird activities, etc.展开更多
Objectives:To investigate health literacy profiles using a multidimensional tool in the elderly,analyze the factors related to health literacy,and explore the relationships between health literacy and health-related b...Objectives:To investigate health literacy profiles using a multidimensional tool in the elderly,analyze the factors related to health literacy,and explore the relationships between health literacy and health-related behaviors.Methods:A cross-sectional survey including 440 participants was conducted at a community health center and a village health center in Changsha,Hunan Province,between June 2020 and August 2020.We used the Health Literacy Questionnaire(HLQ)to assess the elderly’s health literacy.Sociodemographic data and health-related behaviors of them were surveyed with a self-designed questionnaire.Latent profile analysis,Pearson’s chi-squared and ordinal logistic regression were used to analyze the data.Results:The median age of the 440 respondents was 68 years.The participants had the lowest scores in the“appraisal of health information”subscale(2.22±0.52),followed by“navigating the healthcare system”subscale(2.89±0.81)of HLQ.Based on the analysis of three profiles,respondents who were 60 e74 years(OR=2.06,95%CI:1.23e3.42,P=0.006),living in urban areas(OR=3.28,95%CI:2.17e4.94,P<0.001),with secondary education or above(OR=2.86,95%CI:1.92e4.27,P<0.001),and having health insurance(OR=1.89,95%CI:1.02e3.51,P=0.042)were significantly associated with health literacy.Statistically significant associations were found between health literacy level and health-related behaviors,including medical service-seeking behavior(χ^(2)=25.14,P<0.001),exercising regularly(χ^(2)=34.08,P<0.001),and taking a medical examination in the past 12 months(χ^(2)=24.76,P<0.001).Conclusion:The multidimensional health literacy survey has identified the low health literacy level among the elderly in community settings.It revealed the relationships of sociodemographic character-istics,including age,education level and residence,with health literacy.These findings emphasized the importance of health literacy in promoting health behaviors,guiding a profound understanding of the Chinese elderly’s health needs and health literacy to develop community-based health promotion interventions.展开更多
基金Project(2011CB605503)supported by the National Basic Research Program of China
文摘The oxidation behavior of Ti?22Al?(27?x)Nb?xZr (x=0, 1, 6) alloys at 800 °C for exposure time up to 100 h was examined. It is shown that oxidation rate of experimental alloys obeys the parabolic kinetics. Ti?22Al?26Nb?1Zr alloy demonstrates more excellent oxidation resistance than the other two alloys. The main oxidation products are TiO2, Al2O3 and AlNbO4 phases for all these alloys. For the Ti?22Al?26Nb?1Zr alloy, Zr addition can modify the growth mechanism of oxide scale, which can effectively hinder the diffusion of oxygen. Whereas, reaction of Zr with oxygen leads to the formation of ZrO2 precipitates for the Ti?22Al?21Nb?6Zr alloy, which promotes the oxygen ingress into the substrate. Meanwhile, oxidation affected zones, including internal-oxidation layer and oxygen-enriched zone, are present beneath the outmost oxide scale. The difference in these zones is derived from the phase constitution in the starting Ti?22Al?(27?x)Nb?xZr (x=0, 1, 6) alloys.
基金Supported by The National Tenth-Five-Year Scientific Championship Project (No. 2001BA705B02) and National Natural Science Foundation of China Project (No. 30170823).
文摘Objectives: To investigate prevalence and risk fac-tors of syphilis infection among injection drug users(IDUs) in Lianshan Yizu Autonomous Region ofSichuan province, China.Methods: From November 8th 2002 to November29th 2002, a community-based cross-sectional surveywas conducted to investigate the demographic charac-teristics and sexual behaviors of a population of IDUs.Blood samples were collected to test for syphilisinfection. A total of 379 subjects were recruitedfor the study through community outreach and peerrecruiting methods.Results: Of 379 IDUs, the syphilis prevalence amongIDUs was 15.3% (58/379). Gender, years of education,history of unprotected sex with non-steady sex part-ner in the last month, number of sex partners in thelast 6 months, frequency of sex with non-steady sexpartner in the last 6 months, and number of any newsex partner(s) in the last 6 months were associatedwith syphilis infection after univariate analysis usingthe chi-squared test. Multivariate logistic regressionanalysis showed that ethnicity (OR, 2.85; 95% CI,1.55-5.25), marriage (OR, 1.94; 95% CI, 1.04-3.62)and receiving money for sex in the last 6 months (OR, ,5.60; 95% CI, 2.65-11.85) were significantly associ-ated with syphilis infection among IDUs.Conclusions: This study found that receiving moneyfor sex in the last 6 months was significantly associ-ated with syphilis prevalence among IDUs. It isrecommended that further health education andintervention campaigns be focused on IDUs to promotesafe sexual practices.
文摘The grey quasi-preferred analysis (GQPA) is one of important methods for realizing system analysis to conquer the limitations of the existing GQPA model, without any considerations to the difference of the different behavioral factor′s importance. It could not be used to analyze the complex system with multi-hierarchy correlation factors, the weighted synthetic method for calculating abstract incidence degrees between the system beha-vioral characteristics and correlative factors in different hierarchies is given out,and the hierarchic grey quasi-preferred analysis (HGQPA) model is established. The effectiveness of the HGQPA model is tested by the scientific-technical system of Jiangsu Province. The depth and the range of the application of GQPA are developed, and the HGQPA model is regarded as a new approach to systemically analyze the complex systems with multi-hierarchy correlation factors.
文摘AIM To investigate correlations between diet and prevalence of constipation among elderly people in Beijing.METHODS A total of 2776(≥ 60 years) were selected in Beijing region for investigation. Data regarding constipation and diet habits was collected via hierarchical status, segmentation and random cluster sampling. Investigation included constipation-related demographic indicators and diet habits. Door-to-door questionnaires and surveys included daily staple food intakes, frequency of fish, egg, fruits and vegetables consumption. Constipation was defined according to the China Chronic Constipation Diagnosis and Treatment Guideline(2013), with the following constipation judgment indicators: decreased defecation frequency, dry and hard stool, and difficulty in defecation.RESULTS The prevalence of constipation among elderly people in Beijing region was 13%. There was a positive correlation between prevalence of constipation and age, but negative correlations between prevalence of constipation and staple food, fish and dietary fibres(fruits and vegetables) intakes. These differences were all statistically significant.CONCLUSION The prevalence of elderly constipation in Beijing region is closely related to diet habits, and is significantly decreased by high staple foods intake, fish eating and high dietary fibres(fruits and vegetables) consumption.
文摘Chronic heart failure and depressive disorders have a high prevalence and incidence in the elderly. Several studies have shown how depression tends to exacerbate coexisting chronic heart failure and its clinical outcomes and vice versa, especially in the elderly. The negative synergism between chronic heart failure and depression in the elderly may be approached only taking into account the multifaceted pathophysiological characteristics underlying both these conditions, such as behavioural factors, neurohormonal activation, inflammatory mediators, hypercoagulability and vascular damage. Nevertheless, the pathophysiological link between these two conditions is not well established yet. Despite the high prevalence of depression in chronic heart failure elderly patients and its negative prognostic value, it is often unrecognized especially because of shared symptoms. So the screening of mood disorders, using reliable questionnaires, is recommended in elderly patients with chronic heart failure, even if cannot substitute a diagnostic interview by mental health professionals. In this setting, treatment of depression requires a multidisciplinary approach including： psychotherapy, antidepressants, exercise training and electroconvulsive therapy. Pharmacological therapy with selective serotonin reuptake inhibitors, despite conflicting results, improves quality of life but does not guarantee better outcomes. Exercise training is effective in improving quality of life and prognosis but at the same time cardiac rehabilitation services are vastly underutilized.
文摘AIM： To evaluate the long-term effects of gonadotropinreleasing hormone （GnRH）-based vaccine on levels of GnRH antibody and testosterone, and vaccine-induced immunocastration on sexual behavior of male rats. METHODS： The rats were treated with GnRH-PE40 intraperitoneally every other day for 12 wk. GnRH antibody and testosterone level in rat blood were determined by EUSA and radioimmunoassay, respectively. Morphological changes in testes and sexual behavior of rats were evaluated. RESULTS： GnRH-PE40 induced a high production in GnRH antibody, decreased the serum testosterone level, testis atrophy and sexual function in rats. CONCLUSION： Intraperitoneal administration of GnRH- PE40 produces structural and functional castration of male rat reproductive system by inducing anti-GnRH antibody.
基金The project supported by Scientific Research Fund of Heilongjiang Province of China under Grant No. 11511008The author would like to thank referees for their valuable suggestions.
文摘Using elementary integral method, a complete classification of all possible exact traveling wave solutions to （3＋1）-dimensional Nizhnok-Novikov-Veselov equation is given. Some solutions are new.
文摘Nine horizon samples of three soil profiles representative of Dystri-gelic Cambisol, Fibri-gelic Histosoland Relic Ornithosol were taken from Fildes Peninsula of King George Island, Antarctica, to quantitativelydemonstrate the enrichment, migration and loss of the elements (Si, Al, Fe, Ca, Mg, Mn, K, Na and P) insoil horizons and their behaviours within profiles by application of the concept of the enrichment coefficientcalculated in terms of the abundance of Ti. Besides, six horizon samples of 4 other profiles randomly takenfrom the studied area were examined for calculation of the redistributing enrichment coefficient, which wasapplied for a better understanding of the element redistribution between soil and clay fraction along with soildevelopment. The results showed that the enrichment, migration and redistribution of the elements variedstrongly among the investigated soils and horizons, due to the differences of weathering degrees and moisturestatus, influences of sea bird activities, etc.
基金funded with the Hunan Key Laboratory Platform for Nursing(2017TP1004)。
文摘Objectives:To investigate health literacy profiles using a multidimensional tool in the elderly,analyze the factors related to health literacy,and explore the relationships between health literacy and health-related behaviors.Methods:A cross-sectional survey including 440 participants was conducted at a community health center and a village health center in Changsha,Hunan Province,between June 2020 and August 2020.We used the Health Literacy Questionnaire(HLQ)to assess the elderly’s health literacy.Sociodemographic data and health-related behaviors of them were surveyed with a self-designed questionnaire.Latent profile analysis,Pearson’s chi-squared and ordinal logistic regression were used to analyze the data.Results:The median age of the 440 respondents was 68 years.The participants had the lowest scores in the“appraisal of health information”subscale(2.22±0.52),followed by“navigating the healthcare system”subscale(2.89±0.81)of HLQ.Based on the analysis of three profiles,respondents who were 60 e74 years(OR=2.06,95%CI:1.23e3.42,P=0.006),living in urban areas(OR=3.28,95%CI:2.17e4.94,P<0.001),with secondary education or above(OR=2.86,95%CI:1.92e4.27,P<0.001),and having health insurance(OR=1.89,95%CI:1.02e3.51,P=0.042)were significantly associated with health literacy.Statistically significant associations were found between health literacy level and health-related behaviors,including medical service-seeking behavior(χ^(2)=25.14,P<0.001),exercising regularly(χ^(2)=34.08,P<0.001),and taking a medical examination in the past 12 months(χ^(2)=24.76,P<0.001).Conclusion:The multidimensional health literacy survey has identified the low health literacy level among the elderly in community settings.It revealed the relationships of sociodemographic character-istics,including age,education level and residence,with health literacy.These findings emphasized the importance of health literacy in promoting health behaviors,guiding a profound understanding of the Chinese elderly’s health needs and health literacy to develop community-based health promotion interventions.
