4,218 publications from this institution
The paper analyzes the influencing factors for medical undergraduates when it comes to solving the employment short fall in primary healthcare institutions. Method: 304 clinical medicine undergraduates were surveyed with a self-completed questionnaire. The factors influencing medical undergraduates' employment intentions were analyzed by a chi-squared test and binary logistic regression. Results: The main reasons cited for willingness to work in primary healthcare institutions were 'to accumulate primary experience', 'to respond to the national call and serve society', 'to pave the way for future work' and 'to make contributions to their hometown'. The main reasons cited for unwillingness were 'little room for improvement; not optimistic about development prospects', 'slow economic development and poor working conditions', 'insufficient policy protection and difficult re-employment' and 'not high enough salary'. Conclusion: Improve the support policy and provide a development platform so that talent is willing to work in primary healthcare institutions.
Abstract Nanomaterials have attracted a great deal of research interest recently. The small size of nanostructures constrains the applications of well-established testing and measurement techniques, thus new methods and approaches must be developed for quantitative measurement of the properties of individual nanostructures. This article reports our progress in using in situ transmission electron microscopy to measure the electrical, mechanical, and field-emission properties of individual carbon nanotubes whose microstructure is well-characterized. The bending modulus of a single carbon nanotube has been measured by an electric field-induced resonance effect. A nanobalance technique is demonstrated that can be applied to measure the mass of a tiny particle as light as 22 fg (1 fg = 10 −15 g), the smallest balance in the world. Quantum conductance was observed in defect-free nanotubes, which led to the transport of a superhigh current density at room temperature without heat dissipation. Finally, the field-emission properties of a single carbon nanotube are observed, and the field-induced structural damage is reported.
A flexible sensor system based on the conjuncted pyro-piezoelectric effect is demonstrated by Zhong Lin Wang, Ya Yang, and co-workers in article number 1902831. The designed sensor system can be utilized to detect temperature and pressure simultaneously by touch from a human finger. The designed matrix device and the availability of ferroelectric BaTiO3 materials lead to impressive results in the creation of conjuncted effects for energy conversion and novel sensor systems.
PuBei oil field is the first sand oil reservoir to perform hydrocarbon miscible flooding in china. It has integrated, good connecting formation with undeveloped cracking system and permeability of 110.5*10−3 μ m2.It is a typical volatile oil reservoir .MMP is 33Mpa.Injection gas is the by-produced gas. After systematically plan design and research, field production stared. Though lad experiment showed that oil recovery by primary gas injection is higher than primary water injection, there were still some controversies. Thus, the field was developed by primary water injection at east and primary gas injection at west, keeping formation pressure at 35 Mpa. At early exploration time, there were seven injection wells and eight production wells. Now, there are nine production wells and two gas injection wells, seven water injection wells. The velocity of oil production is 44t/d, gas injection is 14.55*104m3/d, water injection is 144 m3/d. it has developed for three years till October 2001; the oil recovery is 19.05%, the synthetic water saturation is 3%. There are certain increases of GOR in some production well but no obvious gas breakout. Primary water injection well cannot change to gas injection since gas cannot be injected after water injection, so cannot perform GAW in east area. This paper introduces general geometry character, basic experimental study, exploration performance, and existing problem of the reservoir and gives some proposals, which is helpful in exploration the similar oil reservoir by miscible flooding.
Interface microstructures of BaTiO3/LaA1O(3) grown by metalorganic chemical vapor deposition (MOCVD) are studied using high-resolution transmission electron microscopy (HRTEM). Interface dislocations in BaTiO3/LaAlO3 have been shown to be directly linked up with the 90 degrees domain boundaries in BaTiO3. This association is a result of strain relief due to a phase transformation when cooled down from the growth temperature. The Burgers vector of the interface dislocations is [010]. (C) 1996 American Institute of Physics.
