[en] Objective: To explore the clinical significance of changes of serum IGF-II, IL-6, IL-8 and beta-defensin-3 levels both before and after treatment in patients with chronic periodontitis. Methods: Serum IGF-II, IL-6, IL-8(with RIA) and beta-defensin-3 (with ELISA) levels were determined in 33 patients with chronic periodontitis and 35 normal health controls. Results: Before treatment, serum IGF-II, IL-6 and IL-8 levels were significantly higher in the patients than those in controls (P < 0.01). But serum beta-defensin-3 level was apparently lower than that in controls(P < 0.01). After treatment for 3 months those variable were about the same as in controls (P > 0.05). Conclusion: Serum IGF-II, IL-6, IL-8 and beta-defensin-3 levels could take part in the pathogenesis of chronic periodontitis in various ways and determination of these levels provides important clinical value. (author)

[en] In this paper we investigate various macroscopic quantum tunnelling phenomena and the phase coherence property of rotating Bose-Einstein condensates. Based on the two-mode approximation, three different cases are studied. When the rotating frequency is independent of time t, by using the SU(2) coherent state path integral method, we discuss two cases: a superposition of two macroscopic states and a Josephson-type ground state. In addition, the specific conditions to reach the two cases are obtained. We also discuss the nonlinear Landau-Zener effect in the dynamic case in which the rotating frequency varies with time t

[en] We find that the Gutzwiller projected Fermi sea wavefunction (GPWF) has the correct phase structure to describe the kink nature of the doped holes in the ground state of the one dimensional t-J model. We find the residual charge correlation beyond the GPWF is well described by an XXZ-type effective Hamiltonian. A Pfaffian-type variational wavefunction with only one parameter is proposed based on this observation and is found to reproduce correctly the global phase diagram and correlation functions of the one dimensional t-J model in both the Tomonaga-Luttinger regime and the Luther-Emery regime

[en] According to the actual operation experience of marine reactor and the characteristics of the design, a marine PWR model is established. The source term is calculated with the FCSC analysis program and the dose rate of each reference point is computed by using QAD-CGA shielding calculation program based on a point kernel code in the accident condition. The characteristics of dose distribution are analyzed at different operational and accident conditions in marine reactor cabin, which provides reference for personnel dose evaluation. (authors)

[en] In the ultraviolet detection system, the Si-based photodetector could be sensitised with different kinds of fluorescent material to enhance its response in the short-wavelength range. Thick-shell ZnCdS:Mn/ZnS core/shell quantum dots (QDs) exhibit unique advantages in UV signal sensitisation due to their long PL lifetime, as well as stable emission matched with CCD’s response. Herein, a single-channel UV panoramic detection system based on these Mn-doped QDs has been proposed. The QDs@PMMA film was attached on a Si-based CCD camera versus a tapered fibre, and an optical chopper was mounted before the QDs@PMMA film. The long lifetime fluorescence originating from UV signal could be still collected by the CCD camera when the chopper is in the ‘off’ state, hence the UV/vis signal ratio is significantly enhanced. (paper)

[en] Objective: To estimate effective and organ doses to prostate cancer patients result ing from the whole-body ¹⁸F-Choline, ¹¹C-Choline and ⁶⁸Ga-PSMA PET-CT examinations. Methods: A total of 150 prostate cancer patients who underwent PET-CT scanning from May 2017 to June 2018 were retrospectively analyzed. They were divided into three groups, each with 50 patients, according to the type of positron radiopharmaceuticals injected. All patients used the same PET-CT scan protocol. PET component dose was calculated by using OLINDA/EXM (version 1.1) software which was based on the MIRD method. The CTDI values were measured by the standard CT phantoms and computed by ImPACT (version 1.0.4) CT, and ImPACT was used for dose calculation from CT. The tissue weighting factors according to ICRP Report 103 were used for effective dose calculation. Results: The effective dose and organ equivalent dose from ¹⁸F/¹¹C-Choline and ⁶⁸Ga-PSMA PET/CT examinations were estimated. The voltage and current of Topogram scan were 120 kV and 35 mA, respectively, as well as 120 kV and (135.6 ± 9.4) mA for low-dose CT scan. The injected activity of ¹⁸F-Choline, ¹¹C-Choline and ⁶⁸Ga-PSMA was (279.2 ± 13.2), (350.2 ± 39.9) and (186.8 ± 19.4) MBq, respectively. The effective dose was (5.0 ± 0.2), (1.6 ± 0.2) and (3.0 ± 0.3) mSv, respectively (F = 837.0, P < 0.001). The CT effective dose was (11.4 ± 0.2) mSv. The total effective dose for three groups were (16.4 ± 0.3), (13.0 ± 0.3) and (14.4 ± 0.4) mSv, respectively. The mean organ equivalent doses were statistically significantly different among groups (F = 381.2-1637.7, P < 0.001). The highest organ equivalent dose was to kidney for ¹⁸F-Choline and ⁶⁸Ga-PSMA PET/CT scans and thyroid for ¹¹C-Choline PET/CT scan. Conclusions: The effective dose to the prostate cancer patients who underwent PET-CT scanning was from 13.0 to 16.4 mSv, with vast majority of these doses coming from CT scans. The lowest radiation dose to the patients was caused by ¹¹C-Choline PET-CT examination, suggesting that it would be a potential prostate cancer PET radiotracer. (authors)

[en] The present work investigates the effect of the reheating temperature on the microstructure evolution and tensile properties of a magnesium composite reinforced by short carbon fibers. This composite was fabricated by semi-solid isothermal treatment and hot extrusion. The results indicate that the dynamic recrystallization grain size of the composite decreases with increasing reheating temperature, and there is strong interfacial bonding between the short carbon fibers and magnesium matrix. After reheating at 610 °C for 30 min, the strength of the composite is significantly improved, particularly the yield strength. The refined grains and good interfacial bonding are responsible for the excellent strength of this composite. (paper)

[en] Objective: To evaluate the clinical curative effect of zoledronic acid combined with ⁸⁹Sr for the treatment of prostate cancer patients with bone metastases. Methods: A total of 74 prostate cancer patients were randomly divided into three groups according to treatment, as follows: Group A (n = 25; median age, 66 years; age range, 46-87 years), zoledronic acid with ⁸⁹Sr; Group B (n = 25; median age, 65 years; age range, 43-89 years), zoledronic acid; and Group C (n = 24; median age, 66 years; age range, 47-85 years), ⁸⁹Sr. Groups B and C were the control groups. All patients were followed up for 6 months, during which the status of bone pain relief and improvement in the number of bone metastatic lesions were observed. Results: The three groups showed similar baseline characteristics. Total pain relief efficiency in group A was 88.0%, while those of the control groups were 72.0%(group B) and 79.2%(group C). Pain palliation of group A significantly differed from those of groups B and C (χ² = 8.959, P < 0.05). Regression of bone metastatic lesions in group A was 88.0%, while those of the control groups were 44.0%(group B) and 75.0%(group C). Significant difference was found between group A and the two control groups (χ² = 9.096, P < 0.05). Conclusion: Combined therapy of zoledronic acid and ⁸⁹Sr in prostate cancer patients with painful bone metastases was more effective in treating pain and improving the quality of life than separate administration of zoledronic acid or ⁸⁹Sr. (authors)

[en] Objective: To estimate the effective and organ dose of patients receiving the ¹⁸F-FDG (¹⁸F-2-deoxy-D-glucose) and ¹⁸F-FET (O-2-¹⁸F-fluoroethyl-L-tyrosine) PET-CT whole body examinations. Methods: Two PET-CT scanning protocols were used for whole body imaging. The effective and organ dose of PET part were calculated using the internal dose computer program IDAC 2.1 based on MIRD method. The effective and organ doses of CT part were calculated by Virtual-Dose software, and the sum of CT and PET dose was the total effective dose of patients. Results: In the conventional PETCT scan protocol, the effective dose was (4.81 ± 1.04) mSv for male and (6.09 ± 0.73) mSv for female patients from ¹⁸FFDG; the effective dose was (2.67 ± 0.38) mSv for male and (3.21 ± 0.38) mSv for female patients from ¹⁸F-FET; the effective dose was (5.63 ± 0.32) mSv for male and (5.51 ± 0.29) mSv for female patients from CT component. The total effective dose was (10.44 ± 1.09) mSv for male and (11.60 ± 0.79) mSv for female from ¹⁸F-FDG PET-CT examination, respectively. Whereas it was (8.30 ± 0.50) mSv for male and (8.72 ± 0.49) mSv for female from ¹⁸F-FET PET-CT examination, respectively. In the diagnostic-quality CT scan protocol, the effective dose was (16.28 ± 1.01) mSv for male and (13.49 ± 0.72) mSv for female patients from CT component. The total effective dose was (21.09 ± 1.45) mSv for male and (19.58 ± 1.03) mSv for female patients from ¹⁸F-FDG, respectively. Whereas it was (18.95 ± 1.08) mSv for male and (16.70 ± 0.81) mSv female patients from ¹⁸F-FET. Conclusion: Different PET-CT scan parameters caused the patient to be exposed to different radiation doses. In the daily work, we should optimize the acquisitive parameters of PET and CT according to the actual situation of the examinee, and reduce the dose of examinee to practice the optimization of radiation protection. (authors)

[en] This paper presents a composite magneto hydrodynamics (MHD) method to control the low-temperature micro-ionized plasma flow generated by injecting alkali salt into the combustion gas to realize the thrust vector of an aeroengine. The principle of plasma flow with MHD control is analyzed. The feasibility of plasma jet deflection is investigated using numerical simulation with MHD control by loading the User-Defined Function model. A test rig with plasma flow controlled by MHD is established. An alkali salt compound with a low ionization energy is injected into combustion gas to obtain the low-temperature plasma flow. Finally, plasma plume deflection is obtained in different working conditions. The results demonstrate that plasma plume deflection with MHD control can be realized via numerical simulation. A low-temperature plasma flow can be obtained by injecting an alkali metal salt compound with low ionization energy into a combustion gas at 1800–2500 K. The vector angle of plasma plume deflection increases with the increase of gas temperature and the magnetic field intensity. It is feasible to realize the aim of the thrust vector of aeroengine by using MHD to control plasma flow deflection. (paper)