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Today, China has become the world's third largest international trading country and the largest container manufacturer. However, with the demand of industrial production, resulting in the decrease of tropical rain forest year by year, clonal wood (apitong) has become a rare tree species, and the raw materials used in the production of container wood flooring have gradually developed from imported clonal wood to multi-timber. In this case, it is very important to find new materials to replace imported clone wood and study the mechanism of damage (destruction) of container wood flooring subjected to external strength. Based on the mechanical analysis and comparison of 7 260 kg container wood floor test in trolley and conventional laboratory load test, the causes and cracking position of container wood floor opening were studied, and the form and mechanism of container wood floor under the action of external strength were clarified. [ABSTRACT FROM AUTHOR]

Tobacco foreign material eliminating is an important step in the process of cigarette production. Through combing the research progress of tobacco foreign material eliminating technology in cigarette processing in China, it was pointed out that there were significant differences of tobacco foreign material in threshing and redrying, tobacco primary processing, rolling and wrapping process and waste cigarette treatment process. The tobacco foreign material eliminating methods in domestic cigarette processing included air purification removal, photoelectric impurity removal, laser impurity removal, etc. Different impurity removal methods had their advantages, disadvantages and applicable conditions. However, these impurity removal methods and technologies for tobacco were basically used alone, which made it difficult to meet the impurity removal efficiency while taking into account other index requirements. In the future, it should focus on in-depth research from three aspects: clarifying the characteristics and service conditions of various impurity removal methods, optimizing and upgrading the existing commonly used impurity removal methods, and carrying out research on multiple impurity removal and integrated composite impurity removal technologies. This would comprehensively improve the level of tobacco foreign material eliminating technology in the cigarette processing process, and then improve the cigarette product processing quality. [ABSTRACT FROM AUTHOR]

Objective To analyze the trends of disease burden of cervical cancer,uterine cancer,and ovarian cancer among Chinese women from 1990 to 2019,and to provide a basis for formulating precise prevention and control measures in China. Methods The global disease burden data in 2019 were used to describe the changes in indicators such as incidence,mortality,years of life lost due to premature mortality(YLL),years lived with disability(YLD),and disability-adjusted life year(DALY) of cervical,uterine,and ovarian cancers in China from 1990 to 2019.Furthermore,the Bayesian age-period-cohort model was adopted to predict the incidence and mortality of the cancers from 2020 to 2030. Results From 1990 to 2019,the incidence rates and mortality of cervical,uterine,and ovarian cancers in Chinese women showed an upward trend,and the age-standardized incidence rate of ovarian cancer increased the most(0.78%).In 2019,the incidence of cervical cancer and uterine cancer concentrated in the women of 55-59 years old,and ovarian cancer mainly occurred in the women of 70-74 years old.The DALY,YLL,and YLD of cervical,uterine,and ovarian cancers all presented varying degrees of growth at all ages.The Bayesian age-period-cohort model predicted that from 2020 to 2030,the incidence and mortality of cervical cancer in China showed a decreasing trend,while those of uterine cancer and ovarian cancer showed an increasing trend.There was no significant change in the age with high incidence of the three cancers. Conclusions From 1990 to 2019,the overall disease burden of cervical,uterine,and ovarian cancers in China increased,while the disease burden of cervical cancer decreased after 2020.It is recommended that the efforts should be doubled for the prevention and control of cervical,uterine,and ovarian cancers.