Objective To explore the effect of hydrogen molecules on the psychological state of submariners after long voyage.Methods A total of 197 submariners who had participated in a long-voyage mission were selected as the research objects by cluster sampling.They were randomly assigned to observation group or control group.The observation group was given hydrogen inhalation and hydrogen-enriched drinking water for 30 days,while the control group was given air inhalation and purified water.Before and after the intervention,mental health status was assessed by the Symptom Checklist 90(SCL-90),Self-rating Anxiety Scale(SAS),and Self-rating Depression Scale(SDS).The cognitive ability,such as digit conversion,visual memory,tracking goal,and number span were tested.Results After the intervention,the score of each dimension and positive items of SCL-90,as well as the total scores of SAS and SDS were decreased in both groups(P<0.05 or P<0.01),and the scores of depression and anxiety and positive items of SCL-90,as well as the total scores of SAS and SDS in the observation group were lower than those in the control group(P<0.01).The single correct response time for digit conversion in the observation group was shorter than that in the control group(P<0.01).Conclusion Hydrogen molecule can improve mental health and cognitive performance of submariners after long voyage.

Objective To observe the effect of drinking hydrogen-rich water on preventing heat stroke(HS)of workers in special positions.Methods A total of 384 workers in special positions were selected with cluster sampling in February 2022.They were assigned to control group or observation group by a random number table,with 192 cases in each group.Double-blind experiment method was adopted.On the basis of the prevention and health education of HS,routine protection and daily drinking water in the study subjects,the observation group drank 1.5 L of hydrogen-rich water every day(200-300 ml each time,5-7 times a day,the hydrogen concentration of hydrogen-rich water was 1 800 μg/L),and the control group drank 1.5 L of pure water every day(200-300 ml each time,5-7 times a day)for 6 months.On the day after the intervention,all the workers underwent 10 km weight-bearing cross-country training.During the intervention period,the incidences of HS and its precursor,the detection rate of heat tolerance difference before and after the intervention,core temperature,serum markers of heat intolerance,and inflammatory factors were observed.Results During the intervention period,the precursor of HS appeared in 2 patients(1.04%)in the observation group and 11 patients(5.73%)in the control group,and 1 patient(0.52%)was diagnosed with HS in the control group.The incidences of HS and its precursor in the observation group were lower than those in the control group(P<0.01).After the weight-bearing training,the core body temperature was increased in both groups(P<0.01),but the core body temperature in the observation group was lower than that in the control group(P<0.01).The detection rate of heat tolerance difference,serum heat intolerance markers(alanine aminotransferase,creatine kinase,and creatinine)and inflammatory factors(interleukin-1,interleukin-6,and tumor necrosis factor-α)in the observation group were lower than those in control group after intervention(P<0.05),and those before intervention(P<0.05).Conclusion Drinking hydrogen-rich water can improve the thermal tolerance of workers in special positions,and inhibit or reduce the inflammatory response caused by high heat.It can be used to prevent HS in special positions.

To investigate the aging behavior of fluoroelastomer FM-1D in hot air,with compression set as a parameter for seal aging,aging tests were conducted on fluoroelastomer FM-1D under different initial compression rates in a hot air environment ranging from 60℃to 150℃.The aging kinetic equation relating compression set of FM-1D to temperature and time was established,in order to predict its aging life at 25℃.The test results indicated that when the initial compression rate was 30%,the compression set exhibited an Arrhenius relationship with both test temperature and time.However,at a initial compression rate of 50%,the compression set gradually conformed to the Arrhenius relationship as time extended.These findings provide a reference for determining accelerated testing methods and maintenance cycles for FM-1D rubber materials.

Objective:To verify the applicability of the flight potential evaluation system in the psychological selection of pilots by testing the reliability and validity of the system.Methods:Between September and October 2021, 82 subjects, including 32 pilots and 50 volunteers, were recruited from the Aviation Force and the Air Force Medical Center to complete the flight potential evaluation system test. The pilots and volunteers were divided into the high score group (the top 27% in terms of scores) and low score group (the 27% from the bottom) according to the total score of the evaluation. In order to ensure the consistency of evaluation conditions, some subjects were selected to complete a second evaluation test one week later for reliability analysis. Six flight experts completed the Content Evaluation Form of the Flight Potential Evaluation System while the officer completed the Flight Performance Evaluation Questionnaire as the performance data of the pilots. The pass rates of the pilots and volunteers and discriminability of the flight potential evaluation system were analyzed to test the stability and effectiveness of the system.Results:①The flight potential evaluation system demonstrated a pass rate of 0.75 and a discriminability of 0.30 in pilots, compared with 0.30 and 0.51 in volunteers. The total scores of pilots and volunteers were (7.00±1.16) points and (3.38±2.15) points, respectively, with a statistically significant difference ( t=9.87, P<0.001). Significant differences were found in test scores between high-score group and low-score group for both pilots ( t=10.01, P<0.001) and volunteers ( Z=-4.65, P<0.001). ②Thirty-seven subjects (including 32 pilots and 5 volunteers, all from the Aviation Force) were tested twice, and the Pearson product-moment correlation coefficient for the paired results of 2 identical tests was r=0.750 ( P<0.001). ③As for the content of the evaluation system test, the experts′ degree of agreement and unanimity rate were 1. The evaluation score by the officer was positively correlated with the test score ( r=0.389, P=0.041). Conclusions:The flight potential evaluation system has a strong ability to distinguish flight-related abilities, suggesting that the system can be applied to the psychological selection of pilots and provide data for subsequent tests during the recruitment of candidates.

Objective:To verify the applicability of the flight potential evaluation system in the psychological selection of pilots by testing the reliability and validity of the system.Methods:Between September and October 2021, 82 subjects, including 32 pilots and 50 volunteers, were recruited from the Aviation Force and the Air Force Medical Center to complete the flight potential evaluation system test. The pilots and volunteers were divided into the high score group (the top 27% in terms of scores) and low score group (the 27% from the bottom) according to the total score of the evaluation. In order to ensure the consistency of evaluation conditions, some subjects were selected to complete a second evaluation test one week later for reliability analysis. Six flight experts completed the Content Evaluation Form of the Flight Potential Evaluation System while the officer completed the Flight Performance Evaluation Questionnaire as the performance data of the pilots. The pass rates of the pilots and volunteers and discriminability of the flight potential evaluation system were analyzed to test the stability and effectiveness of the system.Results:①The flight potential evaluation system demonstrated a pass rate of 0.75 and a discriminability of 0.30 in pilots, compared with 0.30 and 0.51 in volunteers. The total scores of pilots and volunteers were (7.00±1.16) points and (3.38±2.15) points, respectively, with a statistically significant difference ( t=9.87, P<0.001). Significant differences were found in test scores between high-score group and low-score group for both pilots ( t=10.01, P<0.001) and volunteers ( Z=-4.65, P<0.001). ②Thirty-seven subjects (including 32 pilots and 5 volunteers, all from the Aviation Force) were tested twice, and the Pearson product-moment correlation coefficient for the paired results of 2 identical tests was r=0.750 ( P<0.001). ③As for the content of the evaluation system test, the experts′ degree of agreement and unanimity rate were 1. The evaluation score by the officer was positively correlated with the test score ( r=0.389, P=0.041). Conclusions:The flight potential evaluation system has a strong ability to distinguish flight-related abilities, suggesting that the system can be applied to the psychological selection of pilots and provide data for subsequent tests during the recruitment of candidates.

To evaluate the aging life of silicone rubber sealing materials in the electrolytic water environment,the compression permanent distortion was taken as the performance change parameter of the sealing ring.Three typical silicone rubber materials,G146,G199,and 6144,were subjected to aging tests in the electrolytic water.The aging data was analyzed by the Arrhenius equation.And the aging kinetics equation of permanent compression deformation retention rate and temperature time was established,the aging life of silicone rubber sealing materials at 25℃was predicted.The results indicate the aging life of G146,G199,and 6144,was 21.3 a,9.8 a,and 12.0 a respectively.These prediction results provide a reference for determining the maintenance cycle of the sealing material.

FLASH radiotherapy (FLASH-RT) has garnered considerable attention globally in recent years. Compared to conventional radiotherapy, FLASH-RT can deliver the total radiation dose to the target volume in an extremely short time, reducing the radiation-induced damage to normal tissue while maintaining similar anti-tumor effects. FLASH-RT has been in the clinical trial stage, with several clinical research result being reported. Based on the collected global clinical research result of FLASH-RT in recent years, this study systematically reviewed FLASH-RT′s safety, radiation-related side effects, treatment efficacy, opportunities, and challenges in clinical trials.

Objective:To investigate the accuracy of magnetic resonance imaging (MRI) cine sequences in determining the range of tumor motion in radiotherapy, providing a basis for the precise delineation of the target volume in motion for radiation therapy.Methods:A modified chest motion phantom was placed in a MRI scanner, and a water-filled sphere was used to simulate a tumor. True fast imaging with steady precession (TrueFISP) MRI cine sequences from Siemens were used to capture the two-dimensional motion images of the simulated tumor. The phantom experiments were divided into three modes: head-foot motion mode, rotation motion mode, and actual respiratory waveform mode. In the head-foot motion mode, respiratory motion period (3, 4, 5, 6, 7 and 8 s), amplitude (5, 10 and 15 mm), and respiratory waveform of the simulated tumor (sin and cos4) were set, resulting in a total of 36 motion combinations. In the rotation motion mode, a cos4 waveform was used for respiration, with respiratory periods of 3, 4, 5, 6, 7 and 8 s, head-foot motion set amplitudes of 5, 10 and 15 mm, and anterior-posterior (AP) and left-right (LR) motion set amplitudes in three combinations ([2.5, 2.5] mm, [2.5, 5.0] mm, [5.0, 5.0] mm), resulting in a total of 54 motion combinations. In the actual respiratory waveform mode, respiratory waveforms of 5 randomly selected patients from Affiliated Cancer Hospital of Zhengzhou University were obtained. Under each motion combination, TrueFISP cine images (30 frames, with an acquisition time of 11 s per frame) were obtained. The code was used to automatically identify the two-dimensional coordinates of the center of the simulated tumor in each image, and sin and cos4 functions were separately employed to fit the tumor position in the motion direction, thereby obtaining the fitted motion period and amplitude. The difference between the maximum and minimum values of the tumor's center coordinates in the head-to-foot direction is taken as the range of movement, referred to as the calculated amplitude. For the actual respiratory waveform, the distance between the measured maximum and minimum positions is used to calculate the amplitude.Results:In the head-foot motion mode, the fitted amplitudes of both sin and cos4 waveforms deviated from the set amplitudes by 0-0.51 mm, with relative deviations of 0%-4.2%. The deviation range between the calculated amplitudes and the set amplitudes of the two waveforms were 0.08-0.94 mm, with relative deviations of 1.1%-6.3%. In the rotation motion mode, the fitted amplitudes deviated from the set amplitudes by 0-0.61 mm, with relative deviations of 0%-6.2%. And the deviation range between the calculated amplitudes and the set amplitudes were 0.16-0.94 mm, with relative deviations of 0%-6.3%. In the actual respiratory waveform motion mode, the deviation range between the calculated amplitudes and the set amplitudes were 0.10-0.48 mm, with relative deviations of 2.2%-8.6%.Conclusion:TrueFISP cine sequences show minimal deviations in determining the range of tumor head-foot motion and effectively captures the tumor's movement state, thereby providing important support for the precise definition of the tumor movement target area during radiotherapy .

Objective:To explore the characteristic pathological manifestations of non-HLA antibodies after kidney transplantation (KT) and examine the differences of MFT values of non-HLA antibodies in different pathological manifestations.Methods:The study was conducted on KT recipients at the First Affiliated Hospital of Zhengzhou University from February 2021 to June 2023 with unexplained elevated serum creatinine. Patients undergoing pathological puncture and concurrent HLA antibody testing were included, focusing on those with DSA (MFI>4 000) and non-HLA antibody negativity. According to the detection results of non-HLA and HLA antibodies, they were assigned into two groups of non-HLA antibody positive (45 cases) and HLA-DSA positive (28 cases). Both non-HLA and HLA antibodies were detected by luminex single antigen microbeads, χ2, t or Mann-Whitney U nonparametric tests were utilized for examining the inter-group differences in pathological manifestations. The recipients with positive non-HLA antibodies were grouped according to the differential pathological features[microvascular inflammation group (22 cases) and non-microvascular inflammation group (23 cases), interstitial fibrosis group (39 cases) and non-interstitial fibrosis (9 cases) ]. MFI values of non-HLA antibodies were standardized and heat map was generated with R language ComplexHeatmap package. The differences of response values of non-HLA antibodies with different pathological manifestations were examined by rank-sum test. Results:The positive rates of microvascular inflammation were 48.9% (22/45) and 82.1% (23/28) in HLA-DSA positive and non-HLA antibody positive groups with statistical significance ( χ2=8.073, P=0.006). The positive rates of interstitial fibrosis in two groups were 80.8% (36/45) and 53.6% (15/28) and the difference was statistically significant ( χ2=5.726, P=0.021). The relative levels of anti-arachnotoxin receptor 1 (Latrophilin 1, LPHN1), keratin 8 (KRT8), keratin 18 (KRT18) and Sjogren's syndrome antigen B (SSB) were higher in microvascular inflammation group than those in non-microvascular inflammation group. The differences were statistically significant [559.50 (262.00, 801.25) vs 285.00 (183.00, 460.00), P=0.024; 504.50 (369.5, 725.25) vs 317.00 (231.50, 458.00), P=0.014; 672.50 (454.50, 969.50) vs 399.00 (246.50, 772.50), P=0.030; 967.50 (482.00, 2 066.50) vs 399.00 (246.50, 772.50), P=0.033]. The relative levels of anti-cyclic citrullinate peptide (CCP), colony-stimulating factor 2 (CSF2), intercellular adhesion molecule 1 (ICAM1) and collagen Ⅳ antibody were higher in interstitial fibrosis group than those in non-interstitial fibrosis group with statistical significance [100.00 (79.88, 167.50) vs 64.50 (37.00, 89.00), P=0.016; 146.25 (93.38, 244.75) vs 87.00 (66.00, 105.00), P=0.041; 132.50 (106.38, 229.50) vs 95.00 (55.00, 125.00), P=0.037; 432.50 (280.75, 653.75) vs 208.00 (192.00, 301.00), P=0.028]. Conclusions:As compared with HLA-DSA, the characteristic pathological manifestations of non-HLA antibodies post-KT include a lower incidence of microvascular inflammation and a higher incidence of interstitial fibrosis. For non-HLA antibody response values of characteristic pathological manifestations, the expressions of different non-HLA antibodies vary statistically.

ObjectiveTo analyze the microbial diversity in the rhizosphere soil of Gastrodia elata with different yields and explore the influence of soil microorganisms on the yield of G. elata. MethodThe experiment adopted the 16S DNA and ITS high-throughput sequencing technologies to study the diversity of the bacterial and fungal community in the rhizosphere soil of G. elata with high yield （GC） and low yield （DC）. ResultProteobacteria， Firmicutes， and other unidentified Bacteria were dominant in the rhizosphere soil of G. elata. The dominant rhizosphere fungi were Ascomycota， Basidiomycota， and Mortierellomycota. There was no significant difference in microbial community abundance in the high-yield and low-yield rhizosphere soil of G. elata， but there was a significant difference in species composition. Thirty-eight microbes such as Bradyrhizobium， Schleiferilactobacillus， and Archaeorhizomyces were gathered in large numbers in the high-yield rhizosphere soil， and thirty microbes such as Fusarium， Coprinellus， and Nitrosotalea were gathered in large numbers in the low-yield rhizosphere soil. At the level of genus and species， there were six different species in the high-yield and low-yield rhizosphere soil of G. elata， among which Russula mariae， Archeaeorhizomyces， and Ilyonectria were gathered in the high-yield rhizosphere soil of G. elata， while Nitrosotalea， Coprinellus disserminatus， and Fusarium were gathered in the low-yield rhizosphere soil of G. elata. ConclusionThere are different microorganisms in the rhizosphere soil of G. elata with different yields， and it is speculated that these microorganisms are related to the yields of G. elata. The research results are expected to provide a vital theoretical basis for the follow-up study of the high yield of G. elata.