Analysis of Screening Results of Four Common Infectious Diseases in One Stomatology Hospital

Objective: To understand the status and characteristics of hepatitis B, hepatitis C, syphilis and HIV antibody screening in one dental hospital, and to provide scientific basis for the prevention and treatment of common infectious diseases in dental medical institutions. Methods: Collect all samples of patients screened for hepatitis B, hepatitis C, syphilis and HIV from one stomatological hospital in 2018-2019, and make statistics on the distribution of common infectious diseases among patients in stomatology, such as age, gender, type of treatment, department of treatment, etc. Results: The positive rate of hepatitis B was 2.27%, 39.42% in males and 60.58% in females. It was mainly detected by outpatient department, accounting for 87.5%. The age was concentrated in 30 - 60 years old, accounting for 77.88%. It was mainly distributed in oral and maxillofacial surgery, orthodontics and implant, accounting for 82.69%. The positive rate of hepatitis C was 0.1%, 33.33% in men and 66.67% in women. It was mainly detected by outpatient department, accounting for 83.33%. The age is concentrated in 20 - 50 years old, accounting for 100%. It is mainly distributed in oral and maxillofacial surgery, orthodontics and implant, accounting for 100%. The positive rate of syphilis was 0.18%, 33.33% for men and 66.67% for women. It was mainly detected by outpatient department, accounting for 83.33%. The age is concentrated in 30 - 50 years old, accounting for 100%. It was mainly distributed in oral and maxillofacial surgery, orthodontics and implant, accounting for 83.33%. HIV was not detected. Conclusion: The positive detection rate of common infectious diseases in the stomatological hospitals is generally lower than the average level. It is mainly distributed in the department of implant, oral and maxillofacial surgery and orthodontics. The highest positive detection rate of common infectious diseases is hepatitis B which is 2.27%, and the lowest is HIV which is 0.

An in-situ room temperature route to CuBiI_4 based bulk-heterojunction perovskite-like solar cells

Both bismuth and copper are non-toxic and earth-abundant elements suitable for lead-free halide perovskite-like photovoltaic devices. Here, we report a highly facile route for in-situ producing copper-bismuth-iodide(CuBiI4) thin films directly on ITO substrate at room temperature, by utilizing a Bi-Cu alloy layer as precursor. X-ray diffraction and transmission electron microscopy(TEM) results verified the formation of well crystallized CuBiI4 thin films with [222] orientation. The transient photovoltage(TPV) analysis revealed that the CuBiI4 is an n-type semiconductor with a suitable band gap of ~1.81 eV, preferable to photoelectric conversion compared with CH3NH3PbI3. It is very interesting that the subsequent spin-coating process of the classical Spiro-MeOTAD organic solution with TBP and acetonitrile resulted in a dense and smooth CuBiI4:SpiroMeOTAD bulk-heterojunction film. The preliminarily fabricated simple sandwich structures of ITO/CuBiI4:Spiro-MeOTAD/Au hybrid solar cell devices displayed efficient photovoltaic performance with the PCE up to 1.119% of the best sample. The room temperature direct metal surface elemental reaction(DMSER) method may provide a new insight for all-inorganic lead free perovskite-like AaBbXx compounds and high performance photovoltaic devices.