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Objective To investigate the applicability of Beckman PK7300 for TPPA testing on anti-TP reactive specimens from blood donors. Methods 1) The TPPA test using Beckman PK7300 (abbreviated as instrument method) had been established and the performance was verificated by calculating the total compliance rate, positive compliance rate and negative compliance rate as compared with the manual method. The repeatability of this instrument method was also evaluated. 2) The applicability of the instrument method was evaluated by examing 555 TP-reactive samples for 6 consecutive days, so as to analyze the readable reading rate, agglutination strength distribution and other control methods. Results 1) The total, positive, and negative compliance rates of TPPA detection by both instrumental and manual methods were 100% (kappa value =1). The SPC value of samples, read manually as " + + ", was less than or equal to 3 by Beckman PK7300; the SPC value of samples, read manually as " -", was greater than or equal to 20 by Beckman PK7300. The two methods were well consistent. The instrument method was repeated for 12 times for the same samples, and the accuracy rate was 100% (12 / 12), with good repeatability.2) The results of the TPPA test in 555 anti-TP reactivity specimens showed an overall readable rate of 99.82%(554/555). The SPC values of the negative and unsensitized particles of TPPA were distributed on both sides of the determination value without crossover. The control and monitor thoughout the test were carried out automatically by the instrument. Conclusion The TPPA test conducted by the Beckman PK7300 fully automatic blood group instrument is suitable for the confirmatory experiment of anti-TP reactive specimens in blood center laboratories, which could realize the automation and standardization of TPPA detection.

Objective To understand the occupational exposure of blood center staff during blood collection and supply, analyze the influencing factors, explore preventive measures and improve the self-protection awareness of staff, so as to further improve the prevention of such occupational exposure in blood centers. Methods Seventy-two occupational exposure cases, which occurred and registered in Beijing Red Cross Blood Center from January 2010 to December 2021, were reviewed by retrospective survery methods, and such cases were classified and analyzed statistically. The incidence of blood-borne occupational exposure was compared by genders, departments, occurrence locations, education level, occupation type, work link, causes of exposure and body parts, so as to analyze the influencing factors, and then propose corresponding prevention strategies. Results From 2010 to 2021, a total of 72 blood-borne occupational exposure cases occurred. When classified by gender, the exposure rate of women was more than twice that of men; by age, the exposure rate of 18~25 years old was the highest, reaching 7.84%, but 26~40 years old group contributed the most cases, accounting for 70.83% (51/72); by working years, the exposure rate of staff with working years less than 3 years was relatively high, but the staff with 4~10 working years contributed the most cases, accounting for 54.17% (39/72); by the education level, the the exposure rate of stall with bachelor degree and below was the highest(90.28%, 65/72); by the professional title level, the exposure rate of staff with primary and intermediate professional titles was relatively high (94.44% , 68/72); by departments, the exposure rate of Blood Donation Service was the highest (81.94%, 59/72), which was twice or even three times than that of other departments; by occupational type, nurses had the highest exposure rate, accounting for 87.5% (63/72); by body parts, hands were the most vulnerable body parts to occupational exposure; by location, the exposure rate on mobile vehicles is four times than that in indoor places; by the number of exposure times, the incidence of one exposure cases accounted for 72.22%(52/72)while multiple exposure was rare by work link, the exposure rate of the sampling link was significantly higher than that of the other links. Conclusion Blood-borne occupational exposure of staff in blood centers is closely related to gender, age, working years, professional title level, department, occupational type, occurrence place, and body part, and has nothing to do with the education level. More attention should be paid to middle-aged female nurses on the front line of blood donation service, staff with primary or intermediate titles and undergraduate degrees. Otherwise, training and protection should be enhanced, operation methods be standardized, the blood collection environment be improved, and the management, automation and intelligent level of blood collection be promoted.

Objective To explore the viability of classification management of HIV reactive blood donors based on test results in blood screening laboratory. Methods According to the HIV test results of blood donors (including twice ELISA and once NAT), the HIV reactive blood donors were divided into three groups. Group 1 was all-test reactive (both ELISA and NAT were reactive), group 2 serological reactive (only ELISA was reactive), and group 3 NAT reactive (only NAT was reactive). The HIV test results of 191 628 blood donors from May to December 2017 were analyzed. Samples with positive RIBA results and / or the repeated reactive NAT results were determined as HIV true positive. The yielding rates of HIV true positivity in each group were analyzed. Receiver operating characteristic curve (ROC curve) was used to elevate the S/CO limit under 99% specificity as the blood donor deferral limit for ELISA. Results A total of 180 HIV reactive samples were detected out of 191 628 blood donors, including 77 positive cases in group 1, 100 in group 2 and 3 in group 3. 1) The HIV reactive results were diverse. Among the 82 true positive blood donors, 4 were early HIV infection (3 HIV antibody+ antigen window period yield, 1 HIV antibody window period yield), 2 were suspected elite controllers, and 76 cases were both serology and NAT reactive. 2) The overall yielding rate of HIV was 47.67%, with group 1 (100%) = group 3 (100%) > group 2 (2.17%), showing statistically significant (P0.05). All true positive blood donors in group 1 and group 2 could be accurately screened by using the blood donor deferral limit for ELISA1 and ELISA2 simultaneously. Conclusion The composition of HIV results among blood donors is diverse and complex. It is necessary to continuously improve the awareness of HIV prevention and control. The classification of HIV reactive blood donors is conducive to conduct fine and scientific management. The blood donors in group 1 and group 3 should be permanently deferral, and the suspected HIV elite controllers in group 2 should be paid attention to and permanently deferral.

Objective To discuss the reliability and applicability of the current blood deferral strategy concerning anti-TPreactive blood donors (by ELISA). Methods TPPA confirmatory test was performed on the samples routinely detected by two different anti-TP ELISA reagents(reagent 1 and reagent 2), and the test data of dual reagent reactive and one reagent reactive blood donors were analyzed to determine the possibility of true positivity. Results 1 624 anti-TP reactive samples(by ELISA) were collected, among which 1 467 were dual reagent reactive, 77 were reagent 1 reactive, and 80 were reagent 2 reactive. TPPA results showed that the positive predictive value (PPV) of dual reactive samples was 85.48%. Samples with high S/CO value (reagent 1≥13 and/or reagent 2 >17) were more likely to be true positive, with the PPV at 98.56% (reagent 1) and 99.13% (reagent 2), respectively, which were significantly higher than that when the S/CO value was≥1. Among the samples reactive to one reagent, 2 were confirmed positive in reagent 1 and 3 in reagent 2, with the PPV at 2.60% and 3.75% respectively, and had no correlation with high S/CO value. Conclusion Dual-reagent reactive donors with high S/CO value showed high possibility of true positivity, therefore should be deferred. TPPA test is helpful to identify true positivity in one-reagent reactive donors. Confirmatory test and follow-up should be a supplement to the current blood donor deferral strategy to ensure blood safety.

Objective To assess the status of HCV infection by analyzing the results of anti-HCV reactive blood samples detected by the current blood testing strategy, and discuss the viability of classified management of reactive blood donors. Methods The anti-HCV reactive samples (dual ELISA and once NAT), from May 2017 to October 2018, were divided into three groups: samples both anti-HCV and HCV RNA reactive, sole HCV RNA reactive, and sole anti-HCV reactive, and all of them were confirmed by recombinant immunoblot assay (RIBA). The positive predictive value (PPV) between groups were compared. The sensitivity, specificity and PPV for each reagent under different screening threshold (screening threshold for routine detection, optimal screening threshold, and corresponding screening threshold of the highest PPV) were analyzed. The group with low PPV were stratified by ELISA S/CO values, and PPV by different screening threshold was compared. Results There were 939 reactive samples (0.49%, 937/191 627). Confirmed by RIBA, the positive rate of anti-HCV reactive samples was 10.67%(100/937). Two samples were sole HCV RNA reactive (0.001%). Both anti-HCV+ HCV RNA reactive samples were 6.71%(63/939), with the PPV of 96.83%(61/63). Sole anti-HCV reactive samples were 93.08(874/939), with the PPV of 4.46%(39/874), among which PPV by dual and one ELISA reagent were 18.72% and 0.15%, respectively, showing statistically significant difference (P

Problems such as a difficulty in feature selection and poor generalization ability were prone to occur when traditional method was exploited to detect abnormal network traffic.Therefore, an abnormal traffic detection method based on the long short term memory network (LSTM) and improved residual neural network optimization was proposed.Firstly, the features and attributes of network traffic were analyzed, and the variability of the feature values was reduced by preprocessing of network traffic.Then, a three-layer stacked LSTM network was designed to extract network traffic features of different depths.Moreover, the problem of weak adaptability of feature extraction was solved.Finally, an improved residual neural network with skipping connecting line was designed to optimize the LSTM.The defects of deep neural network such as overfitting and gradient vanishing were optimized.The accuracy of abnormal traffic detection was improved.Experimental results show that the proposed method has higher training accuracy and better visibility of data processing.The classification accuracy rates under two classifications and multiple classifications are 92.3% and 89.3%.It has the lowest false positive rate when the parameters such as precision rate and recall rate are optimal.Moreover, it has strong robustness when the sample is destroyed.Furthermore, better generalization ability can be achieved.

Ni-graphene composite coating was prepared on 45 steel substrates by electro-brush plating. The graphene layers,graphene in the composite coatings,the grain size and morphology of the coatings were characterized by transmission electron microscope(TEM),atomic force microscope(AFM),scanning electron microscope(SEM),energy dispersive spectrometer(EDS),Raman spectrometer,X-ray diffraction(XRD). The hardness of coatings was investigated by microhardness tester. The results show that graphene in Ni-graphene composite coating exists in the form of three(type Ⅰ,type Ⅱ,type Ⅲ),compared with the pure Ni coating,the grain size of Ni-graphene composite coatings reduces; when the content of graphene is 0.5g/L,the quality of Ni-graphene composite coating is best; because of the high hardness of graphene and its fine-grain strengthening effect,the hardness of Ni-graphene composite coating is 15.2% higher than that of pure Ni coating.

Biological researches have attracted wide attentions in recent years, mimicking the morphology of creatures, learning the function of morphology and applying it to the engineering area have become the research focus. Investigating the special function of bionic surface texturing based on geometric morphology can provide us ideas to optimize surface properties of materials,extend the materials service life, widen the scope of application of materials, and improve the application values of materials. Through studying on the principle and application of hydrophobicity, bionic drag reduction, antifriction and wear-resistant due to the geometric morphology, the different functions of bionic texturing were explored, the future development directions of focusing on bionic patterns preparation and mechanism exploration were clarified, and further the surface treatment on materials was carried out to prepare the materials with more superior properties.

TiOZ nanorods have large specific surface area and the ability of directional transmission electron， based on which can reduce recombination probability of light-generated electrons and holes，and improve the photoelectric conversion efficiency of DSSC. As graphene has low resistivity，good stability and excellent transparency，it can be introduced into anode film to improve the electronic transmission. The TiOZ nanorods were prepared by hydrothermal method，mixed with different quality of graphene. Its length range was 200-300 nm，with a diameter of about 20 nm. The porous graphene/TiOZ nanorods composite film were prepared by using electro- hydrodynamic technique(EHD)and compositing TiOZ nanorods with different quality of grapheme. The photoelectric conversion efficiency of the DSSC device prepared with the photo-anode film with graphene mass content of 3 % was 4. 23 %，the photoelectric conversion efficiency increased by 36%，relative to that of no graphene doped TiOZ nanorods photo-anode film.

Although there is poor outcrop in the area, the Daoxiang formation exposed in North Fujian has unique rock assemblage and metamorphism, and deformation characteristics show that the Daoxiang group does exist, and belongs to metamorphic rock of the Cambrian period in previous research with Sm-Nd model age as (500±35) Ma. However, the limitations of the test method, adversly influence the the reliability of the formation age. LA-ICP-MS U-Pb dating provides reliable and precise evidence of the formation age of the rocks. Zircon LA-ICP-MS U-Pb data of basalt and siliceous rocks carried out by this group show that the newest age of basalt is (111.4±2.0) Ma, i.e. belonging to Early Cretaceous, which represents the lower limit of the formation age. The result is consistent with that of siliceous rocks, the newest of which is 124 Ma. The inherited zircon ages indicate proterozoic-paleozoic-mesozoic materials may be included in the source region, so the Daoxiang formation should be further disintegrated, the Vesicular basalt and Siliceous rocks which formed at Mesozoic should be separated from the Daoxiang formation. The discovery of all these ages enriches research work of tectonic evolution of Daoxiang formation and provides valuable data of the isotopic geochronological age.

Geometrical imaging models and calculations of orientation parameters are the main factors affecting the positioning of stereo Synthetic Aperture Radar (SAR) images. For accurate positioning with squint stereo SAR images and less Ground Control Points (GCPs), a positioning algorithm with one GCP is designed. In this algorithm, the position and velocity of the radar antenna phase center are derived using orbit parameters, and the close range and Doppler centroid of the SAR images are compensated by one GCP. Thus, accurate orientation parameters are obtained and accurate positioning with stereo SAR images is completed. Airborne SAR images acquired by the Chinese Academy of Surveying and Mapping are used in experiments. The positioning errors of the checkpoints are calculated and analyzed, and it verified the accuracy and effectiveness of the proposed method.

Daily meteorological data from 1981 to 2022 and citrus growth periods data were used in this paper. The daily mean temperature, daily maximum temperature and their duration were selected as indicators of heat stress in citrus to clarify the spatial distribution characteristic and temporal variation trend of heat stress during citrus growth periods. The spatial and temporal differences of heat stress in different growing periods of citrus were compared using a paired t-test. The results show that (1) the average frequency, times and intensity of heat stress during flowering-fruit expanding stage of citrus are 87.73%, 2.23times•y-1 and 5.28d•times -1, respectively. High-value areas are mainly concentrated in the southeast of Jiangxi province. The average frequency, times and intensity of heat stress during the fruit expanding-fruit coloring stage of citrus are 56.43%, 1.15times•y-1 and 2.74d•times -1, respectively. High-value areas are mainly in the northern and central parts of Jiangxi province. (2) The station ratios, times and intensity of heat stress during the flowering-fruit expanding stage of citrus show a decreasing trend, with an average decrease of 0.90 percent points, 0.02 times and 0.06 d•time -1 every 10 years, respectively. The station ratios, times and intensity of heat stress during fruit expanding-fruit coloring stage of citrus show an increasing trend, with an average increase of 6.80 percent points, 0.26times and 0.50d•times -1 every 10 years, respectively. (3) The paired t-test results show that, the frequency, times and intensity of heat stress during flowering-fruit expanding stage of citrus are significantly higher than that during fruit expanding-fruit coloring stage of citrus. However, the climate tendency of times and intensity of heat stress during flowering-fruit expanding stage of citrus are significantly lower than that during fruit expanding-fruit coloring stage of citrus. The flowering-fruit expanding stage of citrus in Jiangxi province is the most frequent period of heat stress. For now, it is necessary to strengthen citrus defenses against heat stress during the flowering-fruit expanding stage. In the future, we should improve the prevention of heat stress in citrus during the fruit expanding-fruit coloring stage. [ABSTRACT FROM AUTHOR]

Objective To investigate the expression of transforming growth factor-beta 1 in endometrial fibrosis in rats and related mechanisms. Methods Sprague-Dawley female rats were randomly divided into sham operation group (n=12) and model group (n=12). Uterine tissues were collected on days 7, 14 and 18 after surgery. HE staining and Masson staining were measured the number of endometrial glands and degree of endometrial fibrosis. The protein expression of TGF-β1 and α-SMA were measured by immunohistochemistry. Results Compared with the sham operation group, the uterine structure of the rats in the model group was significantly disrupted; there was a significant increase in TGF-β1 expression in the model group at 7 days,14 days, and 28 days of modeling; the number of endometrial glands decreased, the fibrotic area of endometrium increased and the expression of α-SMA was significantly higher at 14 days and 28 days of modeling. Conclusions TGF-β1 may promote endometrial fibrosis by activating myofibroblasts.

Pumped storage power plants are one of the significant means for regulating power systems， holding crucial importance for their secure， economical， and stable operation. The current research status of economic benefit analysis of pumped storage power plants is introduced， and the static and dynamic economic benefit analysis method of the collaboration between a pumped storage power plant and a thermal power plant is put forward. Moreover， the collaboration between a 4×300 MW pumped storage power plant and a 2×1 000 MW thermal power plant in a region is taken as an example to analyze the economic benefits resulting from their collaboration. The detailed calculation methods for the economic benefits of pumped storage units such as peak shaving and valley filling， frequency modulation， phase modulation， and contingency reserves are presented. These calculations can serve as a rational foundation for the collaboration between pumped storage power plants and thermal power plants.

In order to achieve accurate grasping of the target object with fewer drives, a metamorphic manipulator with single drive and multi-mode is proposed by combining metamorphic principle with the kite-straight-line mechanism. The manipulator can change its two working modes including linear parallel grasping and adaptive envelope grasping by one motor. Firstly, the equivalent mechanism of the metamorphic manipulator in different configurations is derived based on the law of minimum resistance. Variable topological structures are described using topology diagram and corresponding kinematic models of the manipulator in different configurations are established. Secondly, the relationship between the contact force of each knuckle and the input force of the manipulator is established according to the principle of virtual work. The elastic coefficient of the elastic element is optimized by analyzing the influence relationship between the elastic element and the envelope grasping stability. Finally, the correctness of the proposed static model is verified through a combination of numerical calculation and virtual simulation, which can provide reference for the design and application of this type of metamorphic manipulator.

In order to study the flexible deformation of reed, based on the finite element method, the reed is discretized, and the dynamic equation of flexible reed system is established by using Lagrange equation. The reed is meshed by ANSYS software, and the vibration characteristics such as modal and mode shape are analyzed. In ADAMS, the rigid-flexible coupling model of beating-up mechanism is established, the dynamic simulation is carried out under the condition of considering beating-up resistance, and the reed stress is analyzed. The results show that the dynamic equation of the flexible reed is consistent with the simulation results, which verifies the correctness of the equation; the possibility of resonance deformation of the reed in the beating-up mechanism motion is very small; when the beating-up resistance is applied, the dynamic performance of the rigid-flexible coupling model is more fluctuant than that of the rigid body, and the change of the beating-up resistance has obvious influence on the acceleration of the beating-up mechanism; The stress of the reed is mainly concentrated near the lower end during weft beating -up. This conclusion can provide an important reference for the optimal design of beating-up mechanism. [ABSTRACT FROM AUTHOR]

We used 10 representative provenances at different latitudes in two 33-year-old Pinus massoniana provenance test stands (Chun' an Laoshan in Zhejiang and Taizi Mountain Shilong in Hubei) to measure the differences among provenances, study the geographical variation, and identify its responses to hydrothermal factors. The results showed that the 8 C of the average annual rings was significantly different among the provenances of P. massoniana, being higher in trees from high latitude than from low latitude. The δ13C of average annual rings showed a zonal variation trend, indicating an adaptation to the original environment. The δ13C of annual rings was negatively correlated with mean annual temperature (MAT), mean temperature in January (T1), annual precipitation (MAP), precipitation from May to September (P5-9) and cumulative temperature above 10 °C (CT). It was positively correlated with the aridity index (AI). The response function of AI to δ13C annual rings in Chun'an and Taizi Mountain explained 37.5% and 42.5% of the variation, respectively, indicating that AI was the most important limiting factor. The Taizi Mountain test site in Hubei Province located in the central and western region with relatively dry soil and high aridity. Therefore, the δ13C of the average annual ring was 1.8% higher than that in the Chun' an test site. The δ13C rings of P. massoniana at the Taizi Mountain and Chun' an were sensitive to the temperature in July and August, respectively. Summer precipitation was the main factor for carbon isotope fractionation with stable rings. The sensitivity of different provenances to future climate changes was different. [ABSTRACT FROM AUTHOR]

Objective To assess the effects of dimethicone at different doses in bowel preparation for small bowel capsule endoscopy (SBCE) and explore the optimal dose for the examination. Methods A multicenter randomized controlled trial (RCT) was carried out on 132 patients from 4 different institutions from May 2016 to January 2019. They were randomly divided into 3 groups, with 44 cases in each group. All of them were given 2 liters of polyethylene glycol (PEG) solution orally 6 h before procedure, and then in 30 min before examination, the patients were asked to drink 100 mL pure water, 2.5 g and 5 g 100 mL dimethicone solution for those from group A, B and C, respectively. The primary evaluation indexes included small bowel bubble quantity (SBBQ), small bowel valid picture ratio (SBVPR), small bowel cleaning quality (SBCQ), and the secondary evaluation indexes contained gastric bubble quantity (GBQ), gastric cleaning quality (GCQ), completion rate (CR), diagnostic yield (DY), and small bowel transit time (SBTT) and gastric transit time(GTT) of the capsule. Results The SBBQ of group A was higher than those of the other 2 groups in the proximal, middle and distal segments of small intestine (P0.05). Similar results were seen in the SBIRP in the 3 groups. No statistical significances were found in other indexes among the 3 groups (P>0.05). Conclusion Dimethicone treatment can efficiently decrease intraluminal bubbles and improve the visibility of small bowel mucosa for SBCE, and the optimal dose of dimethicone is 2.5 g.

In view of the insufficient strength,vibration deformation and fracture of the sley system of the beating-up mechanism in the existing loom,the structure of the sley system is optimized. According to the finite element modal calculation theory,the vibration equation of the new multi-degree-of-freedom sley foot system is established. The modal and mode of the sley foot are analyzed in ANSYS. The rigid-flexible coupling model of the new beating-up mechanism is established in ADAMS,and the flexible dynamic simulation and stress analysis are carried out. The results show that the new sley system is easy to manufacture and install,and can meet the requirement of mechanical properties of beating-up motion. The possibility of resonance deformation of the new sley is very small. The beating-up acceleration curve of the flexible sley foot fluctuate more than that of the rigid body,and the change of the loom speed have a great influence on the acceleration of the beating-up mechanism. The stress distribution of the main body of the new sley is less than that of the original sley.

Objectives The motion attitude (sinkage and trim) of a semi-planing ship (at Froude numberFr > 0.4) have significant effects on its resistance performance during voyage. The sinkage and trim effects on the resistance components (frictional resistance and pressure resistance) is discussed.Methods A CFD study is carried out on the resistance performance of trimaran in calm water, and the k-ε turbulent model and overlapping grid are adopted. The free model and constrained model are computed. The computed results are compared to analyze the effects of sinkage and trim on the resistance components.Results The results show that the change of total resistance caused by sinkage and trim is more than 20% in semi-planing conditions. The sinkage and trim have a significant effect on the pressure resistance, up to nearly 50%; and a relatively small effect on frictional resistance, less than 8.5%. More than 90% of the resistance increase caused by motion attitude comes from the change of pressure resistance.Conclusions Predicting the motion attitudes and resulting pressure resistance changes accurately is extremely important for semi-planing trimaran.

Electro-hydraulic servo valve is an important part of aircraft brake system, which affects the safety of aircraft landing. In order to solve the problem of frequent failure of a certain type of electro-hydraulic servo valve, a model of electro-hydraulic servo valve of the brake system is established by using the regression analysis method. According to the analysis model and the fault symptom criterion, the recent working data of the electro-hydraulic servo valve are analyzed and the fault symptom is diagnosed. The results show that the method can accurately diagnose the fault symptoms of the electro-hydraulic servo valve. The early fault symptom diagnosis can detect the potential fault of the electro-hydraulic servo valve in advance, reduce the fault rate, improve the safety and reliability of the aircraft brake system significantly, and also help to optimize the maintenance strategy and reduce life cycle maintenance costs of the aircraft.

A comprehensive experiment of characterization of the electrochemical properties of the metal oxide coatings was designed. Taking RuO2 and (Ru,La) OX as object which are coated by thermal decomposition of the metal chlorides, the effects of rare earth element La on electrochemical properties of the coatings were investigated using Tafel curves (PC), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The results showed that Ru-La oxide coatings exhibit largely exchange current density, lower polarization resistance, and more number of surface active site. It leads to the increase of electrocatalytic activity of the coatings. This experimental design not only fully has motivated the study enthusiasm and exploration spirit of students, but also has correlated theories to practical experiments by carrying out a project, it also helped the students to develop the ability of critical thinking and problem solving based on what they learned. It provided reference of teaching reform of material designed synthesis experiment. [ABSTRACT FROM AUTHOR]

A series of comprehensive reforms and renovations were conducted in the construction of clinical practice teaching system, team huilding, management mode operating mechanism and people-oriented facilities hy taking the construction of the state clinical skiils experimental teaching demonstration center as an opportunity. The experimental teaching philosophy of "one center, two environments three platforms and four requirements" were proposed. The advanced experimental teaching platform for training hasic clinical skiils and thinking were reconstructed. The clinical experiment courses were adjusted and updated according to Clinical Practitioners Practical Skiils Examination Syllahus and Clinical Skiils of Chinese Medical Students Operation Guide. We focused on comhining with simulative and real clinical environment, integrating the clinical skiil training content and exploring a set of clinical skiils training modes that possessed advanced teaching ideas, reasonahle curriculum structure, lifelike simulative environment, and teaching effects feedhack. Many outstanding achievements were made. It is useful as reference to promote development of clinical skiils training center of local comprehensive university. This paper introduced the characteristics of teaching reforms and management mode of clinical skiils training center of Nantong University. [ABSTRACT FROM AUTHOR]

In order to discover the precursory characteristics and the mechanism of coal bumps by faults with extra thick and hard roof, the No. 25110 working face of Yuejin Coal Mine in Yima was investigated to analyze the law of coal bumps in a certain period. The law of time and space of microseismic energy and frequency and microseismic activity were analyzed with the combination of the microseismic monitoring data based on the typical cases of coal bumps induced by faults in the condition of extra thick and hard roof. The distribution characteristics of stress fields near faults under mining influence was studied by numerical simulation. The causes and mechanism of coal bumps of the face were discussed from three aspects of geological structure, microseismic activity and stress fields. The results show the extra thick and hard roof is cut by F16 thrust faults and two normal faults, which can cause a large roof movement, and provide a condition for the dynamic load of coal bumps. The microseismic energy and frequency decrease, and the microseismic activities near faults reduce. This is the evidence of microseism phenomenon reduction, while the energy is accumulated for coal bumps. High strength abutment pressure is formed by extraction, faults and the goaf of adjacent face. High stress concentration is formed from the faults to No. 25110 lower roadway. Especially high horizontal stress is in the floor of lower roadway. The conditions of power source are provided for coal bumps. [ABSTRACT FROM AUTHOR]

The traditional mixture Gaussian models require much computation and have little clarity of objects' contours. Therefore, a new moving objects real-time detection algorithm is proposed. Firstly, the threeframe-differencing method is introduced in the algorithm in order to improve the contours' clarity of detection objects. Secondly, the computation is reduced by block processing in the Gaussian mixture models on HSI, so the real-time performance of the algorithm is improved. Thirdly, the three-frame-differencing method and the adaptive Gaussian mixture model on HSI are merged by logic computation so as to extract background efficiently. Finally, the detection result is optimized further by the mathematical morphology. The experimental results show the new algorithm can detect the moving objects in the surveillance video sequences faster and more accurately than the classic mixture Gaussian models and improve the clarity of objects' contours. [ABSTRACT FROM AUTHOR]

Innovative education is an important way of creating innovative talents in higher education. Establishing and implementing a curriculum designed for generating innovation is of great social significance. Our article explored the effects and significance of the innovative education in fostering creativity of materials science and technology majors. Also this article explicated the contents and approach to constructing a curriculum designed for a well-rounded and customized education, namely, specifying the teaching goal, upgrading the contents for a general education and diversifying the practice of initiative innovations, expanding the practice of education and implementing an effective administrative methods, clarifying the three approaches of innovative educational practice, 1. e., arranging practice courses for a general education, encouraging extra-curriculum innovations and student-initiated creativity practice, summarizing the traits and effects of innovative teachings. These all sheded light on similar attempts in the future. [ABSTRACT FROM AUTHOR]

The dynamic model of cam mechanisms in high-speed loom is builded and simplified into a single-free-degree elastodynamics modeling. The dynamic design model of cam shedding mechanism is set up, with the aim of making the cam contour line smooth without impact, and then the design equation of the cam contour line is calculated, which is used to construct a simulation design for a case so as to form the curve the research needs. The polynomial curve obtained is smooth without impact and satisfies the need of dynamic features of cam in high-speed loom. The validity and the correctness of dynamic design model is proved by simulation results. [ABSTRACT FROM AUTHOR]

Experimental waste liquid from the experiment named determination of chemical equilibrium constant and partition coefficient was used as raw materials, The optimum conditions for recycling of the waste liquid containing iodine and CCl4 was investigated, in which KIO3 was employed as oxidants and recovery yield of iodine as research indicator. The results shows that recovery yield of iodine can reach 91. 43% under the following conditions; 1. 2 times theoretical amount of KIO3 and theoretical amount of sulfuric acid, reaction time 0. 5 h, V( CCl4) : V(concentrate water) 500 mL : 200 mL. Recycled carbon tetrachloride containing iodine was used in experimental determination of partition coefficiency (Kd) and equilibrium constant (Kc). Compared with original CCl4 containing iodine, the error of Kd and Kc is 0. 75% and 1. 87%, respectively. The results indicate that recycling procedure is appropriate and recycled CCl4 containing iodine can be used in the experiments. [ABSTRACT FROM AUTHOR]

To get early warning for coal bumps effectively, the methods commonly used for the monitoring of coal bumps and their advantages and disadvantages were discussed, and monitoring problems of coal bumps currently were showed. Based on the mechanism of coal bumps, the application model of the hierarchical monitoring was established. It is widely considered that hierarchical monitoring mode of highly complementary can merger their respective characteristics and make up for their respective shortcomings. Taking the Xinzhouyao Cola Mine as an example, it shows that the dangerous areas of coal bumps can be real-time monitored and the dynamic development can be mastered by the microseismic technology in the whole mine. By the electromagnetic radiation cooperation the stress variation of surrounding rock of mining space can be mastered continuously and dynamically, and the further dangerous areas can be found. In addition, the detection of drilling cutting can confirm to dangerous degree effectively. The analysis methods of early warning for microseism, electromagnetic radiation and drilling cutting were comprehensively and detailedly researched in this paper. The engineering practice shows "global scope-zone-locality" in the space can be formed, and "real time-continuity-development" in the time can be achieved, and the disasters of coal bumps can be effectively early warned by the hierarchical monitoring technology of the stronger complementarity. [ABSTRACT FROM AUTHOR]

An analytical model is developed for active control of structural acoustic transmission through the double panel-cav- ity structure by using radiation modes, in which the incident panel piezoelectric (PZT) actuator, acoustic actuator in cavity and radiating panel PZT actuator are considered. The formulation for calculating the modal response of the structural-acoustic coupled system is derived in forms of the impedance-mobility matrix. Aiming to achieve the global cost functions during the practical implementation of an ASAC system, control strategies and structural sensing by using radiation modes are proposed for active control of sound transmission through the double-panel structure system. On the basis of developed theoretical model, active control of sound transmission is studied analytically and numerically to compare the control performance be- tween different control strategies and examine the dominant control mechanisms involved in each Control case and the effect of system parameters on control performance. The results show that in low frequency range global sound attenuation similar to the minimization of the radiated sound power can be obtained provided that only modal sound power corresponding to the first four radiation modes is minimized. The strategy using the secondary acoustic source in the cavity to minimize the first several radiation modes is a better control strategy compared to the other control ones due to the dominance of the acoustic mode (0, 0, 0) in the modal couplings and energy transmission in the low frequency range. [ABSTRACT FROM AUTHOR]

The article presents a study regarding the action of fimbriae molecular chaperones coded by ycbR gene which was amplified by polymerase chain reaction (PCR). It highlights the gene expression of the Escherichia coli 0157, which comprises 30,000 proteins. It was observed that the expression proteins were identified by SDS-PAGE after 12 to 16 hours.

The article presents a research which investigates the effectiveness of the recombinant fowlpox vaccine to the viruses found in the fibroblast cells of the chick embryo.

The difference in leaf stable carbon isotope discrimination (Δ) of 18 representative Schima superba provenances was investigated based on three provenance trails located at Jian'ou of Fujian Province and Chun'an and Qingyuan of Zhejiang Province,and the geographic variation pattern and the effects of trial site and provenances growth rate were studied. Significant differences in leaf Δ were observed among the provenaces,and the differences in leaf Δ value between the highest and lowest provenances reached 6.9%,3.0%,and 3.7% in 3 experimental sites,respectively. A classic latitudinal clinal variation pattern was found,because there were significant correlations between the leaf Δ value and the latitude of seed sources in all the 3 sites while no significant correlations were observed between the leaf Δ value and the longitude of the seed sources. The southern provenances showed higher leaf Δ value than the northern provenances,indicating that the water use efficiency (WUE) was lower in southern provenances. The leaf Δ value of different provenances was demonstrated to be greatly affected by the environment of trial sites. The leaf Δ value increased significantly with the improvement of site environment and with the increase of annual rainfall. Significant positive correlations were observed between the leaf Δ value and the growth traits including tree height, DBH, total number of lateral branches, and length of the strongest lateral branch, which indicated that the provenances with higher growth rate and denser crown had larger leaf Δ value. Two and four superior provenances with high growth rate and low leaf Δ value (or high WUE) were selected for Jian'ou of Fujian and Chun'an of Zhejiang, respectively. [ABSTRACT FROM AUTHOR]

Under the assumption that a simply supported rectangular plate is an analytical model, firstly the relationship between structural surface volume velocity and sound power radiated by the plate is analyzed in the wave-number domain, and the mathematical expressions indicating the contribution proportion of structural mode to the volume velocity is derived. Based on these results, combined with charge output equation of the PVDF piezoelectric film and orthogonal property of trigonometric function, a novel design methodology for volume velocity sensor is presented, and an experiment for measuring structural volume velocity on a concrete model is conducted. The results show that the distributed volume velocity sensor has a better sensing accuracy. The validity of this approach is further verified. It is also observed that the deflections of the PVDF sensor shaping and bonding position have obvious effect on sensing accuracy, and the extent of effect on sensing under different excited conditions is different. [ABSTRACT FROM AUTHOR]

This paper determined the refractive index profile of ion-exchanged slab waveguides by IWKB method and complementary function fitting. Also draw some conclusions of the relation between index profile and process parameters on the basis of abundant experiments. ① It shows exponential relationship between diffusion coefficient and temperature. ② The increase of refractive index is linear with concentration of ionic silver in salt bath. [ABSTRACT FROM AUTHOR]