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Objective Shanghai′s rail transit boasts of huge commuter flow, and it is necessary to analyze the spatial distribution, connection and other characteristics of the passengers using urban rail transit for commuting. Method Based on the Baidu location big data and the passenger flow data from the automatic fare collection system of Shanghai rail transit, the commuters of Shanghai rail transit are statistically analyzed from the perspectives of total commuting volume, spatial distribution, commuting route, in-and-out station, and traffic connection characteristics between residence and workplace, and relevant suggestions are put forward. Result & Conclusion It is suggested that the tangential line shall be increased in urban rail transit, the land use layout around station be optimized, and the work place and residence along the urban rail transit network corridor keep a better balance.

The main transmission system in a spent fuel reactor is a face gear drive, which works in concentrated nitric acid with high-temperature, and requires not to be damaged under earthquake. To design its strength reasonably, the dynamic performance of the face gear drive is studied. Its meshing principle and characteristics are briefly elaborated. The dynamic model of the face gear drive is established based on the centralized mass method.The influence of factors such as manufacturing errors and misalignments, time-varying meshing stiffness, corrosion on tooth surfaces, earthquakes on the dynamic performance are taken into consideration to deduce the differential equations of the face gear drive. Runge-Kutta method is applied to solve the differential equation, the dynamic loads under excitations of misalignment, earthquake and corrosion are obtained, and the influence law of these excitations on the dynamic load coefficient is further analyzed. The corrosion and earthquake are the key factors that cause significant increase of dynamic load coefficients, the dynamic load caused by the combined action of the considered various factors is less than twice the driving load.

The HI-13 tandem accelerator, located at the Beijing Tandem Accelerator National Laboratory, has been in operation for 35 years. To ensure the continued performance of the accelerator, the operation and maintenance team has prioritized focus on various aspects. The operation team conducted research that involved developing key components, cultivating a high-quality operational team, improving the machine time efficiency, and increasing the participation of users outside the China Institute of Atomic Energy (CIAE). The primary emphasis has been on developing key components and upgrading subsystems. These efforts have successfully maintained and improved the accelerator's performance, ensuring its safe and stable operation. Finally, the paper alse discusses the challenges faced by tandem accelerators and presents future development plans.

Over the past forty years of reform and opening up, the urban center system in the Pearl River Delta Region has been rapidly restructured. Its two central cities, Guangzhou and Shenzhen, have been fiercely competing in the field of economic development. Dealing with the functional positioning of the two cities has constituted a long-term concern for regional planning and policy making. Under the new circumstances of the Guangdong-Hong Kong-Macao Greater Bay Area, there is an urgent need to clarify the functional positioning of the two central cities of Guangzhou and Shenzhen. Further, there is a need to coordinate the relationship between competition and cooperation, the premise of which lies in the dynamic and accurate identification of urban functional characteristics. Previous studies directly used economic and industrial statistical data to study and analyze urban functions. However, due to the relative low frequency and high cost of data collection and analysis, it is difficult to carry out real-time analysis using these data. Based on the theoretical understanding of the projection of city functions to the city network, this article uses inter-city air passenger flow as its research medium. Further, it uses the air passenger flow data extracted from Baidu location-based services (LBS) big data. Taking the Chinese city network as its overall scope, it adopts the following two approaches. First, it compares the functional characteristics of the cities where the air passenger flows toward Guangzhou and Shenzhen are sourced. Second, it compares the functional characteristics of the employment places in the two megacities of Beijing and Shanghai, where the air passenger flows toward Guangzhou and Shenzhen are sourced. Therefore, the functional attributes and the functional areas of the source cities are used as the basis for identifying the comparative functional features of Guangzhou and Shenzhen to judge their overall functional characteristics in the Chinese urban network. The research results show the following. 1) First, compared with Shenzhen, Guangzhou's network connection with cities across China and Beijing and Shanghai focuses on administrative management and business functions. It plays the role of an administrative and business center within the spatial scale of the Pearl River Delta urban agglomeration. 2) Second, compared with Guangzhou, Shenzhen focuses on technological innovation, finance, and high-tech manufacturing functions, and plays the role of a technological innovation and financial center and high-tech manufacturing base under the scale of the Pearl River Delta. 3) Third, as the two major service industry centers in the Pearl River Delta region, Guangzhou focuses on public and general producer services, and Shenzhen focuses on advanced producer services such as finance and technological research and development. Shenzhen has a higher status within the Chinese urban network system based on the producer service industry. The method provided by this article, which involves locational big data to flexibly extract urban functional characteristics from the city network, is novel. Further, it can serve as a supplementary approach to the studies on urban functions which relied on traditional economic and industrial statistics. Meanwhile, the research results of this article provide evidence for deepening the theoretical understanding of the urban function-space-network mapping relationship.

Objective To investigate the perception of dentists' concerning on measures of occupational protection and provide decision information for enhancing the occupation security. Methods 127 dentists from 52 non-profit hospitals (50 stomatology department in general hospitals and 2 stomatological hospitals ) and 75 profit-making hospitals (7 outpatient departments in general hospitals and 68 dental clinics ) were involved in the cross-sectional questionnaire survey. The fuzzy comprehensive evaluation method was applied for quantitative analysis to evaluate the factor of occupational protection. Results The results showed that the "excellent" and "good" probability of occupational protection in non-profit hospitals were 0.35, while the probability of "fair" and "poor" were 0.30 and 0.17. According to the maximum membership principle, the comprehensive evaluation result was between "excellent" and "good". The probability of "excellent", "good", "fair" and "poor" in non-profit hospitals were 0.15, 0.35, 0.32 and 0.3 respectively, and the comprehensive evaluation result was “good”. Conclusion Awareness occupational protection among dentists in profit-making hospitals is slightly weaker when compared with non-profit hospitals. It is necessary to develop some available intervention measures to guarantee the occupational security for dentists utmost.

In online social networks,advertisements,rumors and malicious links are propagated by spammers arbitrarily.They not only disturb users’usualaccess,but also bring about network security threats and social panics.In an attempt to deal with the spam problems,an information diffusion model was proposed to capture the features of spam propagation.Propagation behaviors are quantitatively analyzed to detect spam messages with a decision tree-based method.The effectiveness of proposed detection model is evaluated with real data from the micro-bloggingnetwork of Sina.The experimental results show that proposed model can effectively detect spams in Sina micro-bloggingnetwork.

Objective: To investigate the epidemiological characteristics of local visceral leishmaniasis in Beijing Municipality from 2021 to 2023, so as to provide insights into formulation of the visceral leishmaniasis control strategy., Methods: Epidemiological data of visceral leishmaniasis cases reported in Beijing Municipality from 2021 to 2023 were collected from the National Health Informatization Disease Prevention and Control Information System, and the epidemiological characteristics of local visceral leishmaniasis cases were analyzed using a descriptive epidemiological method. In November 2021 and 2023, 50 to 100 permanent residents were voluntarily selected within a 100 meter radius of sites where patients lived or acquired Leishmania infections, and venous blood was sampled for anti- Leishmania antibody testing. Venous blood was sampled from dogs for anti- Leishmania antibody testing in natural villages where patients lived or acquired Leishmania infections, or in districts where Leishmania infected dogs were reported. In addition, sandflies were captured with CO 2 mosquito traps and fine mesh nets in natural villages where patients lived or acquired Leishmania infections from May to September, 2021 and 2023, for sandfly species identification., Results: A total of 4 local visceral leishmaniasis cases were reported in Beijing Municipality from 2021 to 2023, with ages of 2 to 77 years, and acquiring Leishmania infections in Mentougou District (2 cases), Changping District (1 case), and Yanqing District (1 case). The anti- Leishmania antibody testing was all negative in 73 human blood samples and the sero-prevalence of anti- Leishmania antibody was 25.00% in 36 venous blood samples from domestic dogs in 2021, with a total of 4 520 Phlebotomus chinensi s captured. The sero-prevalence of anti- Leishmania antibody was 0.51% in 198 human blood samples and 13.58% in 243 venous blood samples from domestic dogs in 2023, with 16.10%, 25.00%, 17.78% and 3.13% sero-prevalence in dogs sampled from Mentougou District, Changping District, Yanqing District and Haidian District, respectively ( P = 0.011), while a total of 1 712 Ph. chinensis were captured, including 1 421 female sandflies (86.54%)., Conclusions: The prevalence of local visceral leishmaniasis was low in Beijing Municipality from 2021 to 2023; however, there is a risk of further spread in the epidemic foci. Intensified visceral leishmaniasis surveillance and control is recommended.

Objective: To investigate the law of auditory remodeling by studying the Cortical Auditory Evoked Potential in a group of post-lingually deaf adults in the early stage of the cochlear implant use., Method: Ten post-lingually deaf adults implanted with PULSAR ci 100 of Medel device ranged from 19 to 52 years old with duration of deafness from 3 months to 23 years.were involved. Their P1-N1-P2 responses to /ba/ at around 60-70 dB SPi and open-set speech recognition scores of mono-syllabic words were recorded at 1. 3 and 6 months after the switch-on of cochlear implants., Result: Six out of 10 typical waveforms of Pl-N1-P2 were obtained. The other I were with atypical waveforms. The group with atypical waveform was characterized by long duration and early onset of deafness. There was no significant difference regarding either the amplitude or the latency of each peak at the 3 data collection time points. There was significant difference among the 3 data collection time points about the speech recognition scores with the highest score at the 6th month of switch on. There was no significant correlation between the peak of the CAEP and speech recognition score., Conclusion: In the first 6 months of cochlear implant use in the post-lingually deaf adults, the duration and the onset age of deafness played important role in respect of the presence and waveform morphology of the CAEPs. It needs at least 6 months for the central auditory system to make use of the audio input from the cochlear implant.

Objective: To study how to perform the hearing screening on the infants in the rural area., Methods: Three thousand nine hundreds and twenty-two infants, about 84% of them from rural, were born in the People Hospital of LaiZhou City from January to December in 2004. The infants were performed fast hearing screening by transient evoked otoacoustic emission (TEOAE) after the birth in 2-7 days. The fail cases were checked again after 4-6 weeks, and then were diagnosed if they still failed after following-up., Results: The infants (3612/3922, 92.1%) have been checked by TEOAE, and the examination was free in the poverty cases. The rate passed on the first check was 69.96% (2527/3922), but 1085 infants failed (30.4%), while 310 infants have not been checked (7.9%). In the 1085 cases that should be rechecked, there was only 633 cases (58.34%) accepted the check on time, while 452 cases (41.66%) missed. In the 163 cases with high-risk infants in 2004, 114 infants (69.96%) were checked, but 49 infants (29.04%) were not checked. Fourteen cases failed in the recheck, and 11 of them were checked by ABR. Two cases were found to be moderate and severe hearing loss in binaural respectively and 4 cases with mild hearing loss in monaural while 3 cases were normal., Conclusions: It is necessary and viable for the infants on hearing screening in the rural area It should be set up and perfected the model for infants on hearing screening in rural area as soon as possible; it should be free for the poor infants to make sure everyone enjoy the health care.