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Desulfurization characteristics of slaked lime and regulation optimization of circulating fluidized bed flue gas desulfurization process--A combined experimental and numerical simulation study
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作者 Jing Chen Wenqi Zhong +2 位作者 Guanwen Zhou Jinming Li Shasha Ding 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2024年第9期163-175,共13页
Circulating fluidized bed flue gas desulfurization(CFB-FGD) process has been widely applied in recent years. However, high cost caused by the use of high-quality slaked lime and difficult operation due to the complex ... Circulating fluidized bed flue gas desulfurization(CFB-FGD) process has been widely applied in recent years. However, high cost caused by the use of high-quality slaked lime and difficult operation due to the complex flow field are two issues which have received great attention. Accordingly, a laboratory-scale fluidized bed reactor was constructed to investigate the effects of physical properties and external conditions on desulfurization performance of slaked lime, and the conclusions were tried out in an industrial-scale CFB-FGD tower. After that, a numerical model of the tower was established based on computational particle fluid dynamics(CPFD) and two-film theory. After comparison and validation with actual operation data, the effects of operating parameters on gas-solid distribution and desulfurization characteristics were investigated. The results of experiments and industrial trials showed that the use of slaked lime with a calcium hydroxide content of approximately 80% and particle size greater than 40 μm could significantly reduce the cost of desulfurizer. Simulation results showed that the flow field in the desulfurization tower was skewed under the influence of circulating ash. We obtained optimal operating conditions of 7.5 kg·s^(-1)for the atomized water flow, 70 kg·s^(-1)for circulating ash flow, and 0.56 kg·s^(-1)for slaked lime flow, with desulfurization efficiency reaching 98.19% and the exit flue gas meeting the ultraclean emission and safety requirements. All parameters selected in the simulation were based on engineering examples and had certain application reference significance. 展开更多
关键词 Circulating fluidized bed flue gas desulfurization(CFB-FGD) Desulfurization characteristics Computational particle fluid dynamics (CPFD)numerical simulation operational optimization Gasesolid flow
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Effectiveness of magnetic resonance imaging and spiral computed tomography in the staging and treatment prognosis of colorectal cancer
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作者 Lu-Na Bai Lu-Xian Zhang 《World Journal of Gastrointestinal Surgery》 SCIE 2024年第7期2135-2144,共10页
BACKGROUND Colorectal cancer(CRC)is a prevalent cancer type in clinical settings;its early signs can be difficult to detect,which often results in late-stage diagnoses in many patients.The early detection and diagnosi... BACKGROUND Colorectal cancer(CRC)is a prevalent cancer type in clinical settings;its early signs can be difficult to detect,which often results in late-stage diagnoses in many patients.The early detection and diagnosis of CRC are crucial for improving treatment success and patient survival rates.Recently,imaging techniques have been hypothesized to be essential in managing CRC,with magnetic resonance imaging(MRI)and spiral computed tomography(SCT)playing a significant role in enhancing diagnostic and treatment approaches.AIM To explore the effectiveness of MRI and SCT in the preoperative staging of CRC and the prognosis of laparoscopic treatment.METHODS Ninety-five individuals admitted to Zhongshan Hospital Xiamen University underwent MRI and SCT and were diagnosed with CRC.The precision of MRI and SCT for the presurgical classification of CRC was assessed,and pathological staging was used as a reference.Receiver operating characteristic curves were used to evaluate the diagnostic efficacy of blood volume,blood flow,time to peak,permeability surface,blood reflux constant,volume transfer constant,and extracellular extravascular space volume fraction on the prognosis of patients with CRC.RESULTS Pathological biopsies confirmed the following CRC stages:23,23,32,and 17 at T1,T2,T3,and T4,respectively.There were 39 cases at the N0 stage,22 at N1,34 at N2,44 at M0 stage,and 51 at M1.Using pathological findings as the benchmark,the combined use of MRI and SCT for preoperative TNM staging in patients with CRC demonstrated superior sensitivity,specificity,and accuracy compared with either modality alone,with a statistically significant difference in accuracy(P<0.05).Receiver operating characteristic curve analysis revealed the predictive values for laparoscopic treatment prognosis,as indicated by the areas under the curve for blood volume,blood flow,time to peak,and permeability surface,blood reflux constant,volume transfer constant,and extracellular extravascular space volume fraction were 0.750,0.683,0.772,0.761,0.709,0.719,and 0.910,respectively.The corresponding sensitivity and specificity values were also obtained(P<0.05).CONCLUSION MRI with SCT is effective in the clinical diagnosis of patients with CRC and is worthy of clinical promotion. 展开更多
关键词 Magnetic resonance imaging Spiral computed tomography Colorectal cancer PROGNOSIS Receiver operating characteristic curve Retrospective study
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The combined detection of carcinoembryonic antigen,carcinogenic antigen 125,and carcinogenic antigen 19-9 in colorectal cancer patients
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作者 Ling-Zhen Gong Qian-Wen Wang Jie-Wen Zhu 《World Journal of Gastrointestinal Surgery》 SCIE 2024年第7期2073-2079,共7页
BACKGROUND Hepatic metastases are common and difficult to treat after colorectal cancer(CRC)surgery.The predictive value of carcinoembryonic antigen(CEA),cancer antigen(CA)125 and CA19-9 combined tests for liver metas... BACKGROUND Hepatic metastases are common and difficult to treat after colorectal cancer(CRC)surgery.The predictive value of carcinoembryonic antigen(CEA),cancer antigen(CA)125 and CA19-9 combined tests for liver metastasis is unclear.AIM To evaluate predictive value of combined tests for CEA,CA125,and CA19-9 levels in patients with liver metastases of CRC.METHODS The retrospective study included patients with CRC alone(50 cases)and patients with CRC combined with liver metastases(50 cases)who were hospitalized between January 2021 and January 2023.Serum CEA,CA125 and CA19-9 levels were compared between the two groups,and binary logistic regression was used to analyze the predictive value of the combination of these tumor markers in liver metastasis.In addition,we performed receiver operating characteristic(ROC)curve analysis to assess its diagnostic accuracy.RESULTS The results showed that the serum CEA,CA125 and CA19-9 levels in the CRC with liver metastasis group were significantly higher than those in the CRC alone group.Specifically,the average serum CEA level in the CRC with liver metastasis group was 162.03±810.01 ng/mL,while that in the CRC alone group was 5.71±9.76 ng/mL;the average serum CA125 levels were 43.47±83.52 U/mL respectively.and 13.5±19.68 U/mL;the average serum CA19-9 levels were 184.46±473.13 U/mL and 26.55±43.96 U/mL respectively.In addition,binary logistic regression analysis showed that CA125 was significant in predicting CRC liver metastasis(P<0.05).ROC curve analysis results showed that the areas under the ROC curves of CEA,CA125 and CA19-9 were 0.607,0.692 and 0.586.CONCLUSION These results suggest that combined detection of these tumor markers may help early detection and intervention of CRC liver metastasis,thereby improving patient prognosis. 展开更多
关键词 Colorectal cancer Liver metastasis Serum markers Carcinoembryonic antigen Cancer antigen 125 Cancer antigen 19-9 Receiver operating characteristic analysis
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OPERATIONAL CHARACTERISTICS AND IMPROVEMENTS OF THE SHANGHAI 4UH PELLETRON
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作者 顾瀚 袁伦明 +1 位作者 毛羽 徐明娟 《Nuclear Science and Techniques》 SCIE CAS CSCD 1991年第4期250-252,共3页
This paper summarizes performance data and operational experiences gained with 4UH Pelletron.
关键词 Pelletron operationAL characteristics ACCELERATOR troubles Gas FEED FACILITY
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Operational Characteristics of Paratransit Services with Ride-Hailing Apps in Asian Developing Cities: The Phnom Penh Case
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作者 Veng Kheang Phun Reiko Masui Tetsuo Yai 《Journal of Transportation Technologies》 2018年第4期291-311,共21页
Rapid adoption of ride-hailing apps (RHAs) has greatly influenced the way people travel—there is no exception for paratransit users. However, it remains unclear whether RHAs would be regarded as threats or opportunit... Rapid adoption of ride-hailing apps (RHAs) has greatly influenced the way people travel—there is no exception for paratransit users. However, it remains unclear whether RHAs would be regarded as threats or opportunities among paratransit operators in Asian developing cities. While RHAs have been viewed as disruptive transportation, several studies explored the threats of RHAs on taxi industry—but only a few examined such threats on other paratransit services (e.g., auto-rickshaws). This study assessed the changes in the operational services among paratransit operators who have adopted RHAs. The changes were examined by statistical comparisons using data collected from questionnaire survey with 182 Bajaj drivers in Phnom Penh, January 23-27, 2018, as a case study. Results showed that majority of the interviewed drivers started new services with RHAs less than a year ago—they were younger (88%) satisfied with RHAs and acknowledged improvements on their operational services. The results suggested that RHAs would be opportunities for those paratransit drivers who have adopted them, while they would be threats for those who have not. The collected data serve as useful inputs for future public transport planning in Asian developing cities. 展开更多
关键词 ASIAN DEVELOPING City operationAL characteristics Ride-Hailing App PARATRANSIT Phnom Penh
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Alternate operation characteristics of a solar-ground source heat pump system 被引量:4
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作者 杨卫波 陈振乾 施明恒 《Journal of Southeast University(English Edition)》 EI CAS 2010年第2期327-332,共6页
In order to investigate the alternate operation characteristics of a solar-ground source heat pump system(SGSHPS),various alternate operation modes are put forward and defined.A two-dimensional mathematical model wi... In order to investigate the alternate operation characteristics of a solar-ground source heat pump system(SGSHPS),various alternate operation modes are put forward and defined.A two-dimensional mathematical model with freezing/melting phase changes is developed for the heat transfer analysis of the soil.Based on the numerical solution of the model,the variation trends of underground soil temperature of the SGSHPS operated in various alternate operation modes are discussed.The results indicate that,for the day-night and short-time interval alternate operation modes without solar energy,the operation time fraction of a solar heat source should be confined to from 50% to 58% when operated in an alternate period of 24 h.Meanwhile,the disadvantages of a natural resumption of soil temperature can be overcome effectively by solar energy filling,and an optimal operation effect can be achieved by integrating the mode of solar energy filling with other alternate modes.In addition,the accuracy of the presented model is verified by the experimental data of borehole wall temperatures.The conclusions can provide a reference for the optimization operation of the SGSHPS. 展开更多
关键词 solar-ground source heat pump alternate operation characteristics numerical simulation experimental validation
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The Optimization on Operation Characteristicsof Urban Medium Voltage Network
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作者 Yao Huannian Cao Meiyue(Xiamen Electric Power Administration, Xiamen) 《Electricity》 1998年第3期27-29,共3页
Traditional small current grounding system has many advantages. Pilot operation shows that optimized one has even better operation characteristics. It has proven to be a geenrallly properand relatively perfect neutyal... Traditional small current grounding system has many advantages. Pilot operation shows that optimized one has even better operation characteristics. It has proven to be a geenrallly properand relatively perfect neutyal grounding method in urban MV network. 展开更多
关键词 URBAN medium voltage NETWORK OPTIMIZATION operation characteristic small CURRENT GROUNDING SYSTEM large CURRENT GROUNDING SYSTEM
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The Development and Operation Mechanism of the Colleges’E-class Network Ideological and Political Education Platform——Based on post-95 college students’social behavior characteristics
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《福建教育学院学报》 2016年第10期F0003-F0003,共1页
Based on the investigation and analysis of the social behavior characteristics of post-95undergraduates, this paper puts forward the principle of sharing and building e-class platform and analyzes thedevelopment of th... Based on the investigation and analysis of the social behavior characteristics of post-95undergraduates, this paper puts forward the principle of sharing and building e-class platform and analyzes thedevelopment of the functions of the four platforms such as the teacher-student service system, instant interactionsystem, SNS community system and vertical segmental pushing system and the realization of the function of modularoperation. Finally, in order to ensure the stable operation of the E-class platform, four measures are put forward suchas the systematic construction of the system, the innovation of team work, the assessment of key performances and thecomprehensive guarantee, thus providing an external guarantee for the stable operation of the E-class platform. 展开更多
关键词 college student network social interaction behavior characteristicS development of E-CLASS platform operation GUARANTEE
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Performance investigation of a low-power Hall thruster fed on iodine propellant
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作者 徐宗琦 王平阳 +2 位作者 蔡东升 谭睿 姜文静 《Plasma Science and Technology》 SCIE EI CAS CSCD 2024年第6期140-148,共9页
The common propellants used for electric thrusters, such as xenon and krypton, are rare, expensive,and difficult to acquire. Solid iodine attracts much attention with the advantages of low cost,extensive availability,... The common propellants used for electric thrusters, such as xenon and krypton, are rare, expensive,and difficult to acquire. Solid iodine attracts much attention with the advantages of low cost,extensive availability, low vapor pressure, and ionization potential. The performance of a lowpower iodine-fed Hall thruster matched with a xenon-fed cathode is investigated across a broad range of operation conditions. Regulation of the iodine vapor's mass flow rates is stably achieved by using a temperature control method of the iodine reservoir. The thrust measurements are finished utilizing a thrust target during the tests. Results show that thrust and anode-specific impulse increase approximately linearly with the increasing iodine mass flow rate.At the nominal power of 200 W class, iodine mass flow rates are 0.62 and 0.93 mg/s, thrusts are7.19 and 7.58 m N, anode specific impulses are 1184 and 826 s, anode efficiencies are 20.8%and 14.5%, and thrust to power ratios are 35.9 and 37.9 m N/k W under the conditions of 250 V,0.8 A and 200 V, 1.0 A, respectively. The operating characteristics of iodine-fed Hall thruster are analyzed in different states. Further work on the measurements of plasma characteristics and experimental optimization will be carried out. 展开更多
关键词 electric propulsion Hall thruster iodine propellant thrust measurement operating characteristics
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Follow-up study of gallbladder stones in 44 children
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作者 Jian-Xiong Yu Zhi-Zhong Jiang +2 位作者 Yuan-Hao Cai Lin Zhou Bin Cai 《World Journal of Clinical Cases》 SCIE 2024年第18期3403-3409,共7页
BACKGROUND Cholesterol stones affect a certain subpopulation of children.Concerns have been raised on the impact of gallbladder surgery on the growth of children and adolescents.AIM To study the population characteris... BACKGROUND Cholesterol stones affect a certain subpopulation of children.Concerns have been raised on the impact of gallbladder surgery on the growth of children and adolescents.AIM To study the population characteristics,clinical features,treatment,and prognosis of gallstones in children.METHODS The clinical data of 44 children with gallstones admitted to The First Affiliated Hospital of Naval Medical University from August 2009 to August 2021 were collected,the children were followed up by telephone to monitor their prognoses.The follow-up ended in August 2023.The shortest follow-up time was 2 years and 6 months,whereas the longest was 13 years and 11 months.The population characteristics,general clinical characteristics,and treatments were retrospectively analyzed.The children were divided according to whether they underwent surgical gallbladder removal into an operation group(n=28)and a non-operation group(n=16),The effects of surgical gallbladder resection on the growth and development of children were analyzed.RESULTS The male–female ratio in the population was 6:5 and 84.09%of the children had onset in adolescence.Furthermore,29.55%of the children were overweight or obese.The study identified 26 cases with metabolic abnormalities,9 with hemolytic anemia,and 4 with choledochal cyst.Of the population,68.18%had recurrent symptomatic cholecystolithiasis.Surgical treatment accounted for 63.64%,with laparoscopic cholecystectomy accounting for 71.43%of surgical treatment.No significant differences were observed in symptoms and complications between the surgery and non-surgery groups.Furthermore,no significant differences were found between the two groups in the attainment of genetic height target and the rightward shift of height curve during follow-up.CONCLUSION The sex characteristics of gallstones in children were not observed.Most gallstones occurred in adolescents and rarely in young children.A considerable proportion of children have inborn causes,which are often concurrent with metabolic abnormalities and hemolytic anemia.Most children had recurrent symptomatic gallstones.Surgical treatment,especially laparoscopic cholecystectomy,is still the main treatment for gallstones in children.Surgical treatment did not affect the growth and development of children who underwent gallstone removal. 展开更多
关键词 Gallstones in children Clinical characteristics Growth and development operation Clinical features
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Using receiver operating characteristic curves to evaluate the diagnostic value of the combination of multislice spiral CT and alpha-fetoprotein levels for small hepatocellular carcinoma in cirrhotic patients 被引量:30
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作者 Guang-Sheng Jia Guang-Long Feng +5 位作者 Jin-Ping Li Hai-Long Xu Hui Wang Yi-Peng Cheng Lin-Lin Yan Hui-Jie Jiang 《Hepatobiliary & Pancreatic Diseases International》 SCIE CAS CSCD 2017年第3期303-309,共7页
BACKGROUND: The various combination of multiphase enhancement multislice spiral CT (MSCT) makes the diagno- sis of a small hepatocellular carcinoma (sHCC) on the back- ground of liver cirrhosis possible. This stu... BACKGROUND: The various combination of multiphase enhancement multislice spiral CT (MSCT) makes the diagno- sis of a small hepatocellular carcinoma (sHCC) on the back- ground of liver cirrhosis possible. This study was to explore whether the combination of MSCT enhancement scan and alpha-fetoprotein (AFP) level ficiency for sHCC. could increase the diagnostic ef- METHODS: This study included 35 sHCC patients and 52 cir- rhotic patients without image evidence of HCC as a control group. The diagnoses were made by three radiologists em- ploying a 5-point rating scale, with postoperative pathologic results as the gold standard. Receiver operating characteristic (ROC) curve analysis was performed to evaluate the diag- nostic value of the three MSCT combination modes (arterial phase+portal-venous phase, arterial phase+delayed phase, arterial phase+portal-venous phase+delayed phase) and AFP levels for sHCC on the background of liver cirrhosis. RESULTS: The area under ROC curve (AUC), sensitivity, and specificity of the combination of arterial phase+portal- venous phase+delayed phase were 0.93, 93%, and 82%, respectively. The average AUC of the arterial phase+portal- venous phase+delayed phase combination was significantly greater than that of the arterial phase+portal-venous phase (AUC=0.84, P=0.01) and arterial phase+delayed phase (AUC=0.85, P=0.03). Arterial phase+portal-venous phase had a smaller AUC (0.84) than arterial phase+delayed phase (0.85), but the difference was insignificant (P=0.15). After combining MSCT enhancement scan with AFP, the AUC, sensitivity, and specificity were 0.95, 94%, and 83%, respectively, indicating a greatly increased diagnostic efficiency for sHCC. CONCLUSIONS: The combination of AFP and 3 phases MSCT enhancement scan could increase the diagnostic efficiency for sHCC on the background of liver cirrhosis. The application of ROC curve analysis has provided a new method and reference in HCC diagnosis. 展开更多
关键词 hepatocellular carcinoma receiver operating characteristic multi-slice spiral CT ALPHA-FETOPROTEIN delayed phase imaging
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Operational Safety Assessment of a High-Speed Train Exposed to the Strong Gust Wind 被引量:2
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作者 Mengge Yu Zhenkuan Pan +1 位作者 Jiali Liu Haiqing Li 《Fluid Dynamics & Materials Processing》 EI 2020年第1期55-66,共12页
The operational safety characteristics of trains exposed to a strong wind have caused great concern in recent years.In the present paper,the effect of the strong gust wind on a high-speed train is investigated.A typic... The operational safety characteristics of trains exposed to a strong wind have caused great concern in recent years.In the present paper,the effect of the strong gust wind on a high-speed train is investigated.A typical gust wind model for any wind angle,named“Chinese hat gust wind model”,was first constructed,and an algorithm for computing the aerodynamic loads was elaborated accordingly.A vehicle system dynamic model was then set up in order to investigate the vehicle system dynamic characteristics.The assessment of the operational safety has been conducted by means of characteristic wind curves(CWC).As some of the parameters of the wind-train system were difficult to measure,we also investigated the impact of the uncertain system parameters on the CWC.Results indicate that,the descending order of the operational safety index of the vehicle for each wind angle is 90°-60°-120°-30°-150°,and the worst condition for the operational safety occurs when the wind angle reaches around 90°.According to our findings,the gust factor and aerodynamic side force coefficient have great impact on the critical wind speed.Thus,these two parameters require special attention when considering the operational safety of a railway vehicle subjected to strong gust wind. 展开更多
关键词 operational safety high-speed train gust wind aerodynamic loads characteristic wind curves
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The Influence of Overlap Degree Research on Nozzle Governing Characteristic 被引量:1
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作者 Lin Ma Jian-qun Xu +1 位作者 Xue-yu Dong Tao Yang 《Energy and Power Engineering》 2013年第4期642-645,共4页
To solve the problems existing in the flow characteristics of steam turbine unit, the influence of valve overlap degree on nozzle governing steam turbine had been studied. The combined flow characteristics of given va... To solve the problems existing in the flow characteristics of steam turbine unit, the influence of valve overlap degree on nozzle governing steam turbine had been studied. The combined flow characteristics of given valve overlap degree were obtained for a 600MW steam turbine unit by the method of theoretical calculation combined with simulation test, and the influence of valve overlap degree on governing stage efficiency and steam chest pressure had been also analyzed. This paper discussed the selection of rational overlap degree and introduced a new method of building model for governing stage efficiency of steam turbine in constant pressure operation condition, which provided theoretical guidance for optimization research on nozzle governing steam turbine operation. 展开更多
关键词 OVERLAP DEGREE Flow characteristics VALVE Point Governing STAGE Efficiency operation Mode
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Visual Study on Flow and Operational Characteristics of Flat Plate Closed Loop Pulsating Heat Pipes 被引量:2
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作者 杨洪海 Groll Manfred Khandekar Sameer 《Journal of Donghua University(English Edition)》 EI CAS 2009年第1期80-84,共5页
This paper presents an experimental study including visualization on a flat plate closed loop pulsating heat pipes.It consists of a total of 40 channels with square cross section(2 mm×2 mm,165 mm long) machined d... This paper presents an experimental study including visualization on a flat plate closed loop pulsating heat pipes.It consists of a total of 40 channels with square cross section(2 mm×2 mm,165 mm long) machined directly on an aluminum plate(180 mm×120 mm×3 mm) covered by a transparent plate.The working fluid employed is ethanol.As a result,various flow patterns and their transitions are observed and found to be related to the fluid fill ratio,input heat load and the device orientation.Also the operational characteristics and working mechanism are discussed. 展开更多
关键词 flat plate closed loop pulsating heat pipes fill ratio flow patterns operational characteristics
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The Fuzzy Neural Network Control Scheme With H∞ Tracking Characteristic of Space Robot System With Dual-arm After Capturing a Spin Spacecraft 被引量:1
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作者 Jing Cheng Li Chen 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2020年第5期1417-1424,共8页
In this paper,the dynamic evolution for a dualarm space robot capturing a spacecraft is studied,the impact effect and the coordinated stabilization control problem for postimpact closed chain system are discussed.At f... In this paper,the dynamic evolution for a dualarm space robot capturing a spacecraft is studied,the impact effect and the coordinated stabilization control problem for postimpact closed chain system are discussed.At first,the pre-impact dynamic equations of open chain dual-arm space robot are established by Lagrangian approach,and the dynamic equations of a spacecraft are obtained by Newton-Euler method.Based on the results,with the process of integral and simplify,the response of the dual-arm space robot impacted by the spacecraft is analyzed by momentum conservation law and force transfer law.The closed chain system is formed in the post-impact phase.Closed chain constraint equations are obtained by the constraints of closed-loop geometry and kinematics.With the closed chain constraint equations,the composite system dynamic equations are derived.Secondly,the recurrent fuzzy neural network control scheme is designed for calm motion of unstable closed chain system with uncertain system parameter.In order to overcome the effects of uncertain system inertial parameters,the recurrent fuzzy neural network is used to approximate the unknown part,the control method with H∞tracking characteristic.According to the Lyapunov theory,the global stability is demonstrated.Meanwhile,the weighted minimum-norm theory is introduced to distribute torques guarantee that cooperative operation between manipulators.At last,numerical examples simulate the response of the collision,and the efficiency of the control scheme is verified by the simulation results. 展开更多
关键词 Capturing operation calm motion control closed chain system dual-arm space robot recurrent fuzzy neural network H∞tracking characteristic
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Determination of the diagnostic value of the resazurin reduction assay for evaluating boar semen by receiver operating characteristic analysis
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作者 Petra Zrimsek Marjan Kosec Janez Kunc Janko Mrkun 《Asian Journal of Andrology》 SCIE CAS CSCD 2006年第3期343-348,共6页
Aim: To assess that metabolic status of spermatozoa could provide a useful tool for evaluation of semen quality. Methods: The accuracy of the spectrophotometric application of the resazurin reduction assay was asses... Aim: To assess that metabolic status of spermatozoa could provide a useful tool for evaluation of semen quality. Methods: The accuracy of the spectrophotometric application of the resazurin reduction assay was assessed using receiver operating characteristic (ROC) analysis. Results: Areas under ROC curves (AUC) for motile sperm concentration and sperm index (SI) (sperm concentration multiplied by the square root of percentage sperm motility multiplied by the percentage normal sperm morphology) were 0.922. The best discrimination between poor and good semen samples according to the SI was achieved at a cut-off point of A610 = 0.209, where high sensitivity (94.1%) and specificity (91.7%) were calculated. The assay was less accurate when motile sperm concentration was used as the criterion value, yielding sensitivity of 88.2% and specificity of 87.5%, respectively. Likelihood ratios (LR) indicate that absorbances lower than 0.209 were at least 11.3 times as likely to be found in good semen samples than those in poor according to the SI, whereas in the case of motile sperm concentration, the LR was calculated to be 7.06. Conclusion: These results show that the resazurin reduction assay combined with spectrophotometry is an accurate method of assessing the quality of boar semen. 展开更多
关键词 resazurin reduction assay SEMEN PORCINE receiver operating characteristic analysis cut-off point selection
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Analysis and Design of Quality Management Platform for the Entire Process of Characteristic Software Talent Training
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作者 Guoxiang Fan Lin Yao +4 位作者 Yin Chen Yong Guo Yingxin Tian Feng Gao Zhongjie Wang 《计算机教育》 2022年第12期24-34,共11页
At the end of 2021 to create a new model of characteristic software talent training for independent and controllable key software fields,the Ministry of Education and the Ministry of Industry and Information Technolog... At the end of 2021 to create a new model of characteristic software talent training for independent and controllable key software fields,the Ministry of Education and the Ministry of Industry and Information Technology jointly approved the establishment of the first batch of 33 Characteristic Pilot Schools of software.As a member of characteristic software schools,the HIT School of Software has been approved and will focus on the construction of 2 characteristic directions,which are large-scale industrial software and industrial professional application software.In order to achieve the goal,it is urgent to develop a comprehensive management platform to control the entire process of talent training,so that we can standardize,modelling,and digitized the entire process of characteristic software talent training.By relating all aspects of student training with and implementing the ability-index mechanisms,we will continuously collect big-data of the entire process of student growth,and generate multidimensional student ability portraits for evaluating the effect of talent training,and adjust as well as optimizing the growth path for students themselves during their studying.Employers will be able to identify talents accurately and provide effective reference for colleges to adjust training plans.This paper will analyze the needs of the platform,provide demand analysis of the platform,extract the correlation model between training,conclude the relations between ability-index activities and ability indicators,and give a reasonable overall system design scheme. 展开更多
关键词 characteristic school of software Talent training Quality management platform Analysis and design
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Characteristics and achievements of the Xin'an Medical School
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作者 Yun Pan Jian Wang +5 位作者 Jianpeng Hu Lina Wang Zihui Li Feifei Bu Yinjun Wen Ya'nan Song 《Journal of Traditional Chinese Medical Sciences》 2018年第4期328-334,共7页
The Xin'an Medical School began in the Jin Dynasty(266-420),developed in the Song Dynasty(960-1279),prospered in theMing and Qing dynasties(1368-1911),and has been passed down to the modern era.As a school of medi... The Xin'an Medical School began in the Jin Dynasty(266-420),developed in the Song Dynasty(960-1279),prospered in theMing and Qing dynasties(1368-1911),and has been passed down to the modern era.As a school of medicine with distinct regional characteristics,it has contributed to the development of traditional Chinese medicine and exerted farreaching influence,mainly in literature resources,medical theory,clinical application,and spiritual culture.This paper intends to discuss its academic characteristics and contribution to the development of traditional Chinese medicine,focusing on its formation,academic inheritance and innovation,overseas popularization,and integration of Confucianism,Taoism,and Buddhism in medicine. 展开更多
关键词 Xin'an MEDICAL School Regional MEDICAL schools Ancient HUIZHOU ACHIEVEMENTS and characteristicS
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STUDY ON THE CHARACTERISTICS OF LOW FREQUENCY SYNCHROMOTOR USED IN MINE HOIST SYSTEMS FED BY THE CYCLOINVERTER
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作者 杨公训 宋凌云 《Journal of China University of Mining and Technology》 1995年第1期98-105,共8页
The Low Frequency Synchromotor Drive Mine Hoist System fed by the cycloinverter has good features from the technological and economical point of view. According to the erating char acteristic of the mine hoist system,... The Low Frequency Synchromotor Drive Mine Hoist System fed by the cycloinverter has good features from the technological and economical point of view. According to the erating char acteristic of the mine hoist system, an advanced analysis is given to the construction, the operating characteristics and the harmonics of the magnetomotive force of the synchromotor fed by the cy cloinverter, and the beneficial suggestions are also given in this paper. 展开更多
关键词 cycloinverter synchromotor operating characteristic M. M. F. harmonics
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Analysis of the Self-Protection Characteristics of a 1.5T Bitter-Like HTS Magnet Operated at 65K
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作者 Yan-Bing Hou Yin-Shun Wang +2 位作者 Chang-Tao Kan Xi Yuan Wei Pi 《Chinese Physics Letters》 SCIE CAS CSCD 2018年第6期79-83,共5页
We present a conceptual configuration of a high-temperature superconducting(HTS)magnet made from REBCO(Re=Rare Earth,B=Barium,C=Copper,O=Oxide)annular plates,called a Bitter-like HTS magnet,which can operate in pe... We present a conceptual configuration of a high-temperature superconducting(HTS)magnet made from REBCO(Re=Rare Earth,B=Barium,C=Copper,O=Oxide)annular plates,called a Bitter-like HTS magnet,which can operate in persistent current mode without joint resistance and can be excited by a flux pump and without current leads and a persistent power supply.An REBCO annular magnet which can generate 1.5 T corresponding to the operating current density 80%of critical current density of the magnet at an operating temperature of65 K is conceptually designed.Then the thermal stability of the magnet is numerically simulated by Comsol software.Whein a piece of RBCO annular plate quenches,the maximum released energy is its stored energy because each REBCO annular plate in the Bitter-like magnet is in parallel.To calculate the stored energy in the REBCO annular plate,the inductance of every annular plate,including self-inductance and mutual inductance,is calculated.Compared with the minimum quench energy(MQE)and stored energy in one REBCO annular plate,the stored energy in one REBCO annular plate is always smaller than the MQE,and the REBCO annular plate will not be damaged even though the stored energy in the REBCO annular plate is fully released,which indicates that this 1.5 T Bitter-like magnet has the property of self-protection. 展开更多
关键词 REBCO Analysis of the Self-Protection characteristics of a 1.5T Bitter-Like HTS Magnet Operated at 65K HTS
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