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Organ transplantation is the most effective treatment for end-stage organ failure. However, donor shortage leads to many patients dying while waiting for transplants. With breakthroughs in basic research,advancements in gene editing technologies,and developments of new immunosuppressive drugs,xenotransplantation is regarded as the most promising solution to address the organ shortage crisis. In recent years, researchers both domestically and internationally have conducted multiple studies on non-human primates (NHPs), brain-dead donors,and patients with end-stage heart failure, end-stage renal disease, and advanced liver cancer. Nevertheless, challenges such as immune rejection and coagulation dysfunction continue to limit recipient survival, hindering significant breakthroughs in the clinical application of xenotransplantation. This review summarizes the latest developments in xenotransplantation research globally, with a focus on immune rejection and coagulation dysfunction following liver xenotransplantation.

Grid-forming （GFM） converters， known for their superior inertia damping characteristics， have emerged as a center research focus in the renewable energy sector. As a result， the damping characteristics of GFM wind power converters are first examined. The analysis centers on their equivalent external characteristics from an impedance standpoint， and the Bode stability criterion is utilized to study their stability during grid connection. Subsequently， the frequency support characteristics of GFM wind power converters are examined in terms of inertia. A comparative investigation is undertaken via simulation analysis to gauge the supportive capability of GFM and grid-following （GFL） wind power converters during alterations in grid frequency and power fluctuation on the wind turbine side. The findings reveal that the external impedance characteristics of GFM wind power converters not only display inductive properties but also maintain commendable stability throughout grid integration. In response to a grid malfunction， GFM wind power converters can furnish a significant measure of power support， equating to a rise in system inertia， thereby indicating favorable grid integration characteristics.

In order to achieve better starting performance of diesel engine in extreme low-temperature environment, the relevant parameters affecting the starting of diesel engine were researched. Through orthogonal simulation, the influence of environmental factors (intake pressure, intake temperature), design parameters (compression ratio, combustor reentrant ratio, nozzle diameter), control parameters (injection temperature, pilot injection quantity, start of main injection, main injection duration, injection interval between pilot injection and main injection) on diesel engine starting process under low-temperature conditions were studied. The key parameters affecting the starting process of diesel engine were extracted by range analysis. Meanwhile the parameters matching of each factor were studied by taking the cylinder pressure, the cylinder temperature and the instantaneous heat release rate as evaluation indexes. The results show that the environmental factors and control parameters have a higher degree of influence on the starting process of diesel engine. Intake pressure, intake temperature, start of main injection and main injection duration are the key parameters affecting the starting of diesel engine under low temperature conditions, and combination one is selected as the best parameter matching combination. The key parameters influencing the low temperature starting process of diesel engine are obtained, which provides a theoretical basis for improving the starting effect of diesel engine under low temperature.

In order to solve the oscillatory heat transfer problem of gas-liquid two-phase flow of cooling oil gallery of piston, a reciprocating oscillatory experimental device reformed by diesel engine was designed and established. The oscillatory flow process of gas-liquid two-phase flow in a test piece was visualized by high-speed camera technology, and the oscillatory flow patterns of gas-liquid two-phase flow in the test piece at initial and full oscillation stage under different rotation speed and liquid filling rate were analyzed respectively. The results show that at initial oscillation stage, the interface between gas and liquid is obvious, and there is no intense turbulent mixing motion. At full oscillation stage, the movement law and flow pattern of liquid change periodically. Rotational speed mainly affects the turbulence intensity of gas-liquid two-phase flow, while the liquid filling rate mainly affects the flow pattern of gas-liquid two-phase flow. The research results reveal the oscillatory flow rules of gas-liquid two-phase flow in cooling oil gallery, and also provide a reference for the structural optimization design of the highly-intensified piston in the future.

The exothermic behaviors of butanol, butyraldehyde, butanone, and butyric acid with nitric acid were studied by adiabatic accelerating rate calorimeter(ARC), and the test results were compared and analyzed, and the system risk was evaluated by THI index method. The results show that under the condition of the zero oxygen balance, butyraldehyde-HNO3 system has the most obvious self-exothermic. When the butyraldehyde content is only 0.14 g, the adiabatic temperature of the system rises to 118.4 ℃ and the heat release amount is 776.6 J/g; butanol-HNO3 system begins to emit heat at about 40.2 ℃, and the highest temperature in the exothermic stage of self-reaction reaches 145.7 ℃ and the maximum pressure reaches about 34 bar(1 bar=105 Pa). Butanone-HNO3 system releases heat from 50 ℃ to 136 ℃, and the amount of heat released is 564.0 J/g. No exothermic point is observed in butyric acid-HNO3 system in the temperature range of less than 140.0 ℃. With the increase of nitric acid concentration(2.0→6.0 mol/L), the risk of butanol-HNO3 system increases from medium to high level. The risks of reaction systems of butanol, butyraldehyde, butanone and butyric acid with 4.0 mol/L HNO3 are at higher, higher, middle and middle levels.

Liver transplantation is the most effective treatment for end-stage liver diseases. However, the shortage of donor livers severely restricts the application of liver transplantation, and the impairments of liver function caused by intraoperative ischemia reperfusion injury and postoperative immune rejection also significantly affect the therapeutic efficacy. In order to improve the shortage of donor livers and further improve the efficacy of liver transplantation, a variety of cell therapies based on stem cells or somatic cells have been tried to repair and improve donor liver function. At present, the time points for cell therapy can be divided into the stage before procurement of donor livers, machine perfusion stage and stage after reperfusion of donor livers. In this review, we summarize the efficacy and the underlying mechanisms of cell therapy in the preservation and function repair of donor livers, so as to facilitate the application and promotion of cell therapy in the field of liver transplantation.

Aiming at the problems of low efficiency, low level of intelligent operation and low level of data informatization application encountered in the current substation equipment test operation, a mobile laboratory platform based on grid cloud data management was developed. This paper focused on the theoretical process of the result judgment of the expert analysis system embedded in the mobile laboratory platform. Combined with the practical application cases of transformer differential protection after operation, according to the test results of low-voltage short-circuit impedance method, capacitance method, frequency response characteristic method, transformation ratio and direct resistance test, the reliability of the embedded expert analysis system to analyze the winding deformation caused by the short circuit impact of the transformer was illustrated. Finally, according to the results of the dismantling inspection after returning to the factory, the validity of the platform in the field application was further verified.

Objective To investigate the effect of isoprene cysteine carboxymethyltransferase (ICMT) gene on the migration and invasion of salivary adenoid cystic cancer cells (SACC) and the related mechanism, to provide experimental evidence for molecular targeted therapy of SACC. Methods Adenoid cystic cancer cells SACC-LM and SACC-83 were cultured in vitro, and siRNA was transfected into human SACC-LM and SACC-83 cells (experimental group) by transient transfection of a liposome vector. A blank control group and negative control group were set up respectively (transfected NC-siRNA). qRT-PCR was peformed to measure the mRNA expression of ICMT and RhoA in each group after transfection and to determine the silencing efficiency. The expression of ICMT, membrane RhoA, total RhoA, matrix metalloproteinase-2 (MMP-2), matrix metalloproteinase-9 (MMP-9) and Rho associated with coiled helical binding protein kinase 1 (ROCK1) in each group was detected by Western blot. The proliferation abilityies of SACC cells was detected by CCK-8 assay. The migration and invasion ability of SACC cells were detected by comparing the relative healing area of cell scratch assay and the number of Transwell assay cells. Results After transfection of ICMT-siRNA into SACC-LM and SACC-83 cells, the expression of ICMT gene and protein in the experimental group was significantly decreased compared with the negative control group and blank control group (P0.05). The expression of RhoA membrane proteins, ROCK1, MMP-2, MMP-9 in the experimental group was significantly decreased compared with that in the negative control group and blank control group (P

ObjectiveTo establish a rapid and nondestructive identification method for human body fluid stains and non-biological stains using three-dimensional fluorescence spectroscopy.MethodsThe collected three-dimensional fluorescence spectrum data of human saliva, 3% blood, coffee and Fanta® stains were processed with dimensionality reduction. After wavelet transform, spectral denoising and feature extraction, the classification formula was established. The Fisher discriminant was used for spectrum matching and recognition to establish the analysis method to distinguish stain types.ResultsAccording to the results of data training and comparison, all the recognition accuracies of Fanta®, coffee, saliva and blood were more than 91.39%. Among them, saliva reached 100% recognition accuracy.ConclusionThree-dimensional fluorescence spectroscopy is a potential method for rapid and nondestructive identification of biological and non-biological stains.

Metabolic syndromes (Mets) is a high-risk factor for a series of cardiovascular diseases. Changes in iodine nutritional status can directly mediate the occurrence of insulin resistance, affect glucose and lipid metabolism and the regulation of blood pressure and also,may contribute to the pathogenesis of Mets by regulating thyroid function. Exploring the role of iodine in the occurrence and development of Mets can provide new ideas for the prevention and treatment of Mets.

A self-tuning fuzzy PID grab force control algorithm was designed to solve the problems of linear elastic deformation and reduced grab force of rope driven robot hand, which easily causes shake and slip of grab target. Firstly, the mathematical models of rope driven manipulator and DC motor based on force control were established, and the order of the control system model was reduced by Padé algorithm. Secondly, the fuzzy technology was combined with PID control, and a self-tuning fuzzy PID controller was designed through the fuzzy control toolbox of Matlab. Finally, the simulation models of PID control, fuzzy control and self-tuning fuzzy PID control were established by using Simulink environment, and the grasping force control simulation of different algorithms was realized. The simulation results show that the algorithm can make the system reach a stable state within 0.5 s, and the steady-state error is less than 0.5%. When the rope rebounds, it can compensate the grasping force within 0.3 s, and has good dynamic performance, which meets the requirements of stable grasping of the target.

The current forensic research on heaps mainly extracts information from the heap of Linux and the NT heap of Windows. However, the study of how to extract the information on the segment heap in the Windows 10 from dump files is not sufficient. To reproduce the internal information on the segment heap, this paper proposes a method for locating and extracting the internal information on the segment heap in the Windows 10 according to the field offset in the vtype description information of memory object. The method uses the pool scanning technology to locate the process object, obtains the starting position of the process heap and scans the process heap according to the structural information on the process object and the process environment block object. Then it locates the position of the segment heap with its feature values, thereby extracting its internal information. Based on the analysis results, five forensic plugins for extracting the information on the segment heap were developed on the Volatility framework. The experimental results show that this method can effectively extract the information on the address of each segment heap and its internal components in the memory and on the size of committed memory, etc. The information can help investigators to analyze the digital traces left in the memory by cyber criminals or cyber attackers.

The incidence of cardiovascular disease in China is still showing an increasing trend year by year. The import of the cardiac rehabilitation system can effectively move the prevention and treatment threshold forward, reduce the mortality and disability rate of cardiogenic diseases and the economic cost of the whole society. However, due to the limitations of our country’s social support system, traditional concepts, and medical insurance system, the development of cardiac rehabilitation in China is still in its infancy and is facing huge challenges; at the same time, how to integrate Traditional Chinese Medicine into the existing cardiac rehabilitation system, to create a cardiac rehabilitation theory and specific practice with Chinese characteristics is also a hot topic of current research. This article intends to review the application scope of cardiac rehabilitation, nursing theories and innovations in nursing methods of cardiac rehabilitation, with a view to provide a certain degree of clinical improvement of the quality of cardiac rehabilitation, assist the development of cardiac rehabilitation nursing in China, and providing patients with better cardiac rehabilitation services. (我国心血管疾病的发病率仍然呈现逐年升高的趋势, 心脏康复体系的引入能够有效将防治关口前移, 降低心源性疾病的致死率、致残率及全社会的经济负担。但限于我国的社会支持体系、传统观念以及医疗保险体制等多方面的限制, 心脏康复在国内的发展仍然处于起步阶段并且面临着巨大的挑战; 同时, 如何将中医中药整合入现有的心脏康复体系, 打造具有中国特色的心脏康复理论和具体实践, 也是目前研究的热点问题。本文拟就心脏康复的应用范围、护理理论以及心脏康复的护理方法创新等方面进行综述, 以期为临床提高心脏康复质量、助力中国心脏康复护理发展和为患者提供更好的心脏康复服务提供一定的参考依据。)

TiMo/ZrVFe getter was prepared by powder metallurgy vacuum sintering method. The materials were analyzed by X-ray diffraction(XRD), particle size analyzer, dynamic flow method and vibration test. The influences of the ZrVFe alloy particle size, phases, proportion of composite material on sorption performance and strength were studied.The results show that the content of Fe element in ZrVFe material increases to generate more Laves (Zr(VxFe1-x)2) phase of C15 structure which can improve sorption performance, and the initial pumping speed of Zr-24%V-8%Fe(mass fraction) alloy reaches 1791 cm3·s-1·cm-2,which is 1.5 times as that (1206 cm3·s-1·cm-2) of the original Zr-24.6%V-5.4%Fe getter,the pumping speed decreases more slowly with the progress of the gettering process. The sorption performance and strength of the composite are affected greatly by adding different contents of Zr-24%V-8%Fe alloy, the sorption performance gradually improves with the increase of adding alloy. The initial pumping speed increases by 26.4% compared with that of TiMo material and an ideal pumping platform appears when 20%ZrVFe alloy is added.However, the strength of the composite decreases distinctly with the mass loss of 2.48% when the addition ratio is 30%.

The effects of the evolution behavior of carbide on impact toughness of 1Cr-0.5Mo steel during cyclic heat treatment were investigated by quantitative metallographic method and electrolytic extraction method with SEM,XRD,EPMA and low temperature impact test. The results show that with the increasing number of cyclic heat treatment, the lamellar carbides in the pearlite structure dissolve and spheroidize gradually, and the type of carbide also changes: M3C→M23C6. Increasing the number of cyclic heat treatments promotes the precipitation and connection of M23C6 along the grain boundaries, significantly deteriorates the impact toughness of 1Cr-0.5Mo steel.When the number of cyclic heat treatments reaches 4,the M23C6 grows to chain-like at the grain boundary and the impact toughness of 1Cr-0.5Mo steel can no longer meet the requirements. During the cyclic heat treatment, the average equivalent circle diameter of the overall carbide in 1Cr-0.5Mo steel shows a trend of decrease first and then increase because of the dissolution of lamellar carbides and the Ostwald ripening of carbides.

The 45 steel was sealing treated for various time in 6%(volume fraction)KH560 solution after the hot-dip aluminizing-anode oxidation. An Al-Al2O3-silane composite coating was formed on the surface of the 45 steel. The microstructure of composite coating was studied. The corrosion resistance of composite coating and its effect on the galvanic corrosion between the 45 steel and 30%(mass fraction)Cf/nylon6 composite were investigated. The results show that the silane coating effectively seals the cracks in Al2O3 coating, prevents the corrosive liquid from attacking the substrate. Hence, the corrosion resistance of the 45 steel is improved. Meanwhile, the good insulation property of the Al-Al2O3-silane composite coating can reduce the driving force of the galvanic corrosion between the 45 steel and 30%Cf/nylon6 composite, consequently, the galvanic corrosion resistance of 45 steel also is improved. After treated with the optimal KH560 treatment process for 5 min, the self-corrosion current density of the hot-dip aluminized 45 steel decreases by 3 orders of magnitude compared with that of the single hot-dip aluminized sample while the electrochemical impedance increases by 2 orders of magnitude, and the galvanic corrosion current density between the 45 steel and 30%Cf/nylon6 composite decreases by about 75%.

In order to study the loosening mechanism of the flange joint bolt in the lateral vibration,the transverse fretting wear test of simulated fasteners was carried out by means of transverse vibration fatigue testing machine,and then the pretightening force and pre-loading of bolt joints under different lateral loads and frequencies were observed.,and measure the amount of wear and surface damage. The experimental results show that the bolt preload reduction is divided into two stages:the plastic deformation stage in which the pre-tightening force decreases rapidly and the fretting wear stage in which the pre-tightening force decreases slowly. The pre-tightening torque drop is divided into three stages:the first stage is not obvious due to the high local contact stress;the second stage is rapidly degraded due to the plastic deformation,and the third stage bolt enters the fretting wear. At the third stage,the pre-tightening torque begins to slowly decrease. Under low frequency vibration of the bolt,the amount of mass change is not sensitive to small changes in frequency. The surface wear of the bolt in contact with the clamp increases as the alternating amplitude load increases;it decreases as the frequency increases.

The gap on the surface of hypersonic vehicle will be of an important influence on its overall aerodynamic heat transfer and ablation characteristics. It is important to study the flow and heat transfer mechanism in the gap for the design of thermal protection system of hypersonic vehicle. Aiming at the irregular deformation of the surface gap of a hypersonic vehicle near space, an inclined deformation boundary is constructed at the concentration of heat flux gradient, and the flow and heat transfer characteristics in the gap are simulated by the unstructured grid direct simulation Monte Carlo(DSMC) method. The effect of irregular deformation on the vortex flow and heat transfer characteristics in the gap is analyzed. The results show that inclined irregular deformation can produce both high-temperature drainage and accelerated diversion, and high-temperature drainage can greatly increase the aerodynamic heat load at the bottom of the slot, which is a difficult problem of thermal protection at the bottom of the slot.

The 19F nucleus has a high gyromagnetic ratio that is comparable to that of proton. Due to its high sensitivity and low background in the biological systems, 19F labeling has emerged as an attractive approach in biological solid-state NMR studies. In this review, we summarized the widely used 19F-labeling strategies, 19F solid-state NMR spectroscopy techniques to probe membrane protein interactions, and the recent applications of 19F solid-state NMR in characterizing of membrane proteins. The limitations of 19F solid-state NMR were also highlighted.

A Ti-50. 7% Ni (atomic fraction) shape alloy was prepared by vacuum induction melting under dynamic argon atmosphere. By analyzing the composition, deformation temperature, microstructure, and hardness of the as-cast Ni-Ti shape alloy in this study, it was found that the properties of the as-cast Ni-Ti alloy met the medical standard. To analyze the variation law of the flow stress, the flow stress of the compression deformation for as-cast Ni-Ti alloy was studied by high-temperature compression with a Gleeble-3800 simulated machine within a deformation temperature range of 750-950 ℃, strain rate range of 0. 001-1. 0 s-1, and strain level of 0. 5. To analyze the relationship between variables in the hot deformation process of as-cast Ni-Ti alloy, a constitutive equation based on dynamic material model was established. To determine the reasonable range of hot working conditions for as-cast Ni-Ti alloy deformation, hot processing maps under different hot deformation conditions were set up. The results show that when the deformation temperature decreases or strain rate increases, the flow stress of as-cast Ni-Ti alloy increases. This phenomenon shows that the main factors affecting the flow stress of as-cast Ni-Ti alloy are deformation temperature and strain rate. When the strain rate is 1. 0 s-1, the true stress-true strain curves of as-cast Ni-Ti alloy exhibits a zigzag feature. This is mainly attributed to the alternation between hardening and softening during deformation. According to the hot processing maps under different hot deformation conditions, the processing zone and unstable hot deformation region of the as-cast Ni-Ti alloy were obtained. Then, the best temperature range of hot deformation is determined as 820-880 ℃, and the true strain rate is less than 0. 1 s-1. This study provides a theoretical and data basis for the development of forging process parameters of Ni-Ti alloy.

Flexible electronic devices have attracted great interest owing to the advantages of flexible substrates as well as its arbitrary surface geometries, which may be one key branch of next-generation electronic devices, including paper-like electronic displays, light-emitting diodes, biointegrated medical devices, and solar cells. In recent years, some researchers have combined flexible techniques with spintronics to explore the effect of strain on magnetoelectric heterojunctions grown on flexible substrates and to control the magnetic and electric properties by changing the curvature of the substrate. These studies pave the path for the designing electronic devices, including magnetic storage devices, magnetic sensors, and non-volatile resistance memory.

The nuclear reactor cooling medium drive motoris thecritical equipmentin the primary circuit of hightemperature gas cooled reactors. Ｒole of the helium gas as cooling medium drive system for the exchange of heat，In order to study the influence of characteristics of cooling medium and the fluid field distribution upon temperature rise and system stability in the motor. A 4 500 kW driving motor as the research object，considered the loss formula that helium as the coolant is different from the traditional formula，calculated the windage loss by using numerica method. Fluid field analysis model of the coolingsystem was established. Based on the principle of fluid force，the finite element method was used to obtain the distribution of fluid in the ventilation system; Finally，in order to study the characteristics of helium better，took air as a comparison object，analyzed on influence of fluid property difference upon the wind velocity distribution in the air gap，the rotor axial and radial direction of the ventilation. The results of analysis shows that under the same conditions，the inlet-velocity of fluid region using helium cooling is lower 30% than that of using air cooling，which helps to reduce temperature rise of motor caused by windage loss.

Fine-grained low-grade manganese ore is difficult to extract due to some mineral processing technology problems, such as non-selective aggregation between ore particles, large dosage of flotation reagents, and low efficiency of flotation. In recent years, multiple types of collectors have been used for the flotation of low grade manganese ore (less than 13%), while the concentrate grade was between 16.9% and 18.3%, and the recovery between 56% and 97%. Although the recovery is ideal, the concentrate grade is too low. RA-92 was selected as a new collector in the flotation of low grade manganese carbonate (grade of 10.7%) ores from Fenghuang-Huayuan area in Hunan in this study. The effects of the grinding fineness, pH, inhibitors, and the collecting agent dosage were investigated and the optimum conditions were obtained. The concentrate grade ranges from 10.7% of the original ores to 17.4% in concentrate, and recovery reached 80.2%. This indicates that the new collector has better selectivity and a stronger ability for collecting manganese carbonate. The collector RA-92 is a good prospect in low grade manganese carbonate due to the relatively simple flotation process, less dosage of collector and lower flotation costs.

In this paper, the wideband backscattering fields of two-Dimensional (2-D) linear and nonlinear sea surfaces are numerically simulated employing the Weighted Curvature Approximation (WCA) method. A large number of Monte Carlo trials are performed to investigate the statistical characteristics of the rang-resolved sea clutter, especially for the sea spike phenomenon. Simulation results demonstrate that the long tail of the sea clutter intensity Probability Density Function (PDF) tends to be more evident with finer radar resolution, higher wind speed, and when the radar sight changes from the crosswind direction to the upwind direction. Meanwhile, it is found that the nonlinear sea surfaces are more likely to have sea spikes. In addition, the Pareto distribution is demonstrated to describe the statistics of the sea clutter intensities better than the Kdistribution and Weibull distribution at low grazing angles.

The method of generating the SAR raw data of complex airport scenes is studied in this paper. A formulation of the SAR raw signal model of airport scenes is given. Via generating the echoes from the background, aircrafts and buildings, respectively, the SAR raw data of the unified SAR imaging geometry is obtained from their vector additions. The multipath scattering and the shadowing between the background and different ground covers of standing airplanes and buildings are analyzed. Based on the scattering characteristics, coupling scattering models and SAR raw data models of different targets are given, respectively. A procedure is given to generate the SAR raw data of airport scenes. The SAR images from the simulated raw data demonstrate the validity of the proposed method.

For problem that existing voice communication systems usually use wired communication mode, which cannot guarantee reliability of communication when an accident happens, a kind of wireless voice communication system based on ZigBee technology was proposed. The hardware and software design schemes of wireless voice communication node were described in detail. Reception rate and RSSI were tested under laboratory environment when terminal nodes were in different distances. The test result showed when communication distance between nodes is more than 60 m, packet loss rate is increasing, while RSSI decreases with increasing of distance between nodes. Thus distance between base stations is decided as 60 m, and coverage radius of the base station is as 60 m.

Ground plane range is a kind of outdoor Radar Cross Section (RCS) test range used for static measurement of full-size or scaled targets. Starting from the characteristics of ground plane range, the impact of environments on targets and calibrators is analyzed during calibration in the RCS measurements. The error of relative calibration produced by the different illumination of target and calibrator is studied. The relative calibration technique used in ground plane range is to place the calibrator on a fixed and auxiliary pylon somewhere between the radar and the target under test. By considering the effect of ground reflection and antenna pattern, the relationship between the magnitude of echoes and the position of calibrator is discussed. According to the different distances between the calibrator and target, the difference between free space and ground plane range is studied and the error of relative calibration is calculated. Numerical simulation results are presented with useful conclusions. The relative calibration error varies with the position of calibrator, frequency and antenna beam width. In most case, set calibrator close to the target may keep the error under control.

In order to utilize the resources of all nodes in networks fully,a novel conjunct model of cloud ＆ client computing based on multi-agent was proposed,dividing the computing environment into three layers in accordance with the type of node and adopting agent to represent the behavior and resource of node to realize more efficient resource sharing and collaboration.The model takes full account of available resources owned by terminal nodes and deploys tasks in an orderly manner to the core nodes,servers and terminal nodes in order to maximize the efficiency of the resource utilization.To assure that tasks could be completed efficiently and reliably,a multi-agent-based collaborative multi-ring management mechanism was also presented,which is particularly suitable for the cloud ＆ client conjunct computing environment and propitious to enhance the stability of resources sharing and nodes cooperation and relieve the load of core nodes.Finally,the construction method of experimental system and application demonstration based on the model was provided for reference.

Based on the fractal structure of the large-scale network traffic aggregation, anomalies were analyzed qualitatively and quantitatively from perspective of the global and local scaling exponents.Multi-fractal singular spectrum and Lipschitz regularity distribution were used to analyze the fractal parameters of abnormal flow, trying to identify the relationship between the changes of these parameters and the emergence of anomalies.Experimental results show that the emergence of anomalies has obvious signs on the singular spectrum and Lipschitz regularity distribution.Using this feature, a new multi-fractal-based anomaly detection algorithm and a new detection framework were constructed.On the DARPA/Lincoln laboratory intrusion detection evaluation data set 1999, this algorithm’s detection rate is high at low false alarm rate, which is better than EMERALD.

Wireless sensor networks usually have limited resources, such as energy, bandwidth and processing and so on.And they can’t match the transmission of a large number of data.So, it is necessary to perform in-network compression of the raw data sampled by sensors.The data sensor node collected normally have multiple-modalities pertinence.Multiple-modalities pertinence refers to the different types of data which the same node sampled have some correlation.A adaptive multiple-modalities data compression algorithm using wavelet was designed.In a given threshold of the correlation, the data can be adaptive classified using this algorithm.the relevant data can be estimated using the least square estimation.The characteristics data are abstracted as a matrix, then can be exploited the spatial and temporal corrections using wavelet transform.Theoretically and experimentally, the proposed algorithm can effectively exploit the correlation of the data, the compression ratio of the algorithm has improved.Effectively, it can provide a significant reduction in energy consumption.

In order to reduce large of redundant P2P traffic due to mismatched topology,a self-organized P2P network model with Multi-Mobile agents was proposed. At first,constructed different AS,then promoted some peers as master server agent and candidate server agent,common peers were self-organized into ad hoc network in the AS. Additionally,mobile agent infrastructures were deployed on peers,which were used to partition subnet topology and help user achieve search task. Theoretical analysis and simulation result indicate that the P2P model can reduce redundant P2P traffic to some degree and search efficiency in AS which reinforce P2P system’s robustness furtherly.

For difficulty of monitoring status of energy consumption of crane by use of wired transmission technology, a design scheme of monitoring node of energy consumption based on wireless sensor networks was proposed. The node uses CC2430 chip based on ZigBee technology as master chip, and achieves real-time acquisition and wireless transmission of energy consumption data of crane, which has advantages of low power consumption, low cost, strong anti-interference ability and adaptive capacity.

The experiment aimed to investigate the effects of different levels of Chinese herbal additives on the growth performance, serum biochemical indicators, and diarrhea condition of lactating lambs, in order to screen for the appropriate addition level. A total of 48 healthy male lactating lambs with an aged 23 days and a body weight of (6.59±0.03) kg were selected and divided into four groups using a single-factor randomized block design, with three replicates per group and four lambs per replicate. The control group was fed with a basic concentrate, while the experimental groups were fed with concentrate feed containing 0.1% (group 1), 0.3% (group 2), and 0.5% (group 3) Chinese herbal additives, respectively. The trial period was 37 days, with a preliminary trial period of 7 days and a formal trial period of 30 days. The results indicated that compared to the control group, group 1, and group 2, the weight of lambs in the group 3 was extremely increased at 45 and 60 days of age (P<0.01), and the average daily weight gain was extremely increased from 30 to 60 days of age (P<0.01). Compared to the control group, the weight of lambs in the group 2 was extremely increased at 60 days of age (P<0.01), and the feed-to-gain ratio was extremely decreased for the groups 2 and 3 from 30 to 60 days of age (P<0.01). Compared to the control group, the levels of serum glucose (GLU), insulin (INS), total cholesterol (TC), triglycerides (TG), and total protein (TP) in lambs from the group 3 were extremely increased (P<0.01), the albumin (ALB) content was significantly increased (P<0.05), glucagon (PG) content was extremely decreased (P<0.01), and non-esterified fatty acids (NEFA) content was significantly decreased (P<0.05). The TP content in lambs from the group 2 was significantly increased (P<0.05). The levels of β-hydroxybutyrate (β-HB) and blood urea nitrogen (BUN) in lambs from the groups 2 and 3 were significantly decreased (P<0.05), and uric acid (UA) content was extremely decreased (P<0.01). Compared to the control group, the diarrhea rate was extremely decreased (P<0.01), and the recovery rate was extremely increased (P<0.01), with a significant decrease in recovery time (P<0.01) for lambs in the groups 2 and 3. Studies show that the addition of Chinese herbal additives to lactating lamb concentrate can improve the growth performance of lambs, enhance the metabolism synthesis of nutrients, prevent and control the occurrence of diarrhea and accelerate the recovery of diarrhea in lambs, and the addition amount of 0.5% is the best effect. [ABSTRACT FROM AUTHOR]

As an excellent material for flexible sensors, conductive hydrogels have broad prospects in the field of wearable devices. In this study, a series of PVA/EG conductive hydrogels with different mass ratios of PVA were prepared by mixing the hydrogel base polyvinyl alcohol (PVA) with ethylene glycol (EG). The structures and morphologies of 10%, 20%, and 30% PVA/EG hydrogels were characterized, among which, the 20% PVA/EG hydrogel exhibited higher relative background intensity, crystalline content, and more surface pores. The sensing properties of the 20% PVA/EG conductive hydrogel, including sensitivity, linearity, response time, stability, and temperature reliability, were tested using a universal materials testing machine. The results showed that the sensitivity coefficient of the conductive hydrogel reached up to 0.74, the linear correlation coefficient reached 0.987, the response time was as low as 80 ms, and the relative resistance change remained relatively constant during 50 cycles of 15% stretching. Moreover, the hydrogel sample continued to function normally at -20 °C. Finally, the conductive hydrogel samples were attached to different parts of the body, such as fingers, spine, and feet, for motion experiments, validating the feasibility of the conductive hydrogel in various human motion monitoring scenarios. [ABSTRACT FROM AUTHOR]

Algebraic multi-grid (AMG) is one of the most commonly used algorithms for solving large-scale sparse linear algebra equations in the field of scientific engineering computing and industrial simulation. For each grid layer in the Setup phase, AMG needs to calculate the coarse grid matrix Ac=RAP through the product of three sparse matrix based on the restriction operator R, the current fine grid matrix A, and the interpolation operator P, which has become the main bottleneck in the parallel performance of AMG. This paper first discovers that the performance bottleneck of the RAP parallel algorithm in mainstream AMG solvers is caused by the quadratic complexity of branch judgments. Then, utilize the row-based order characteristics of the sparse matrix format CSR, and propose a RAP parallel algorithm called MiniBranRAP with linear complexity of branch judgment counts. The algorithm is integrated into the JXPAMG solver, and the effectiveness of the algorithm is verified through practical examples. The numerical test results show that, for 6 typical examples from practical applications, compared with the latest version of Hypre's Boomer AMG solver, the JXPAMG solver based on Mini- BranRAP can speed up the computation efficiency of the Setup phase by an average of 3.3 times and a maximum of 9.3 times on 28 processors. [ABSTRACT FROM AUTHOR]

The effects of different adding methods of granite and tuff stone powder on the properties of C40 concrete were studied. The results show that: when replacing fly ash with equal amounts of stone powder, the impact on concrete slump is relatively small, but the strength of the concrete decreases when the amount is high, and the replacement amount should not exceed 40 kg/m3. The replacement of machine-made sand by stone powder in equal amount has no adverse effect on strength. The viscosity of concrete mixture has significantly increased. The replacement of machine-made sand by granite stone powder should not exceed 90 kg/m³, and the replacement of tuff stone powder should not exceed 60 kg/m³. Granite stone powder and tuff rock powder should si multaneously replace fly ash and machine-made sand to reduce the adverse effect of individual replacement. An increase of 10 kg/m³ of water consumption can make the viscosity of stone powder concrete consistent with the benchmark concrete. Although the strength and resistance to chloride ion penetration of concrete slightly decreased, it has no adverse effect on the early crack resistance of concrete. The two kinds of stone powder can be used in producing C40 concrete which has certain design strength surplus and served in mild environment. [ABSTRACT FROM AUTHOR]

ObjectiveTo explore the influence of "Internet plus" postpartum health care service on postpartum depression, and to provide an evidence for reducing the incidence of postpartum depression and improving the quality of life for postnatal women.MethodsMothers who gave birth between August 1, 2021 and June 30, 2023 lived in the six streets of Xuhui District were selected as the research subjects. The puerperants were randomly divided into the intervention group and the control group according to the order of enrollment using a numerical numbering system, with 210 cases in each of the intervention group and control group. The intervention group adopted the "Internet plus" postpartum health care services, while the control group adopted the conventional postpartum health care services. The risk factors related to postpartum mental health and the incidence of postpartum depression were compared between the two groups.ResultsThere was no statistically significant difference in the scores of postpartum mental health-related risk factors between the two groups at the first 2 weeks and 1st month after delivery (t=0.736 and t=1.260, P>0.05). However, there was a statistically significant difference in the scores of postpartum mental health-related risk factors at the 3rd months after delivery and 6th months after delivery (t=2.089, P0.05). In the 1st month, the 3rd month and the 6th month after delivery, the intervention group adopted the "Internet plus" postpartum health care service, thus the differences in depression scores were statistically significant (t=2.616, t=2.793 and t=3.107, P

In the pursuit of building a country strong in education, the foremost task is to cultivate high-quality teachers. The quintessential traits of such teachers are characterized by possessing a distinctive, comprehensive, practice-oriented, highly refined, and creative personal practical theory. This study starts with the issue of how primary and secondary school teachers construct their personal practical theories, applies Grounded Theory and exploratory case studies to investigate the complete process and theoretical principles of teacher's construction of personal practical theory. Based on 10 cases of teacher's personal practical theory construction, using in-depth interviews and Grounded Theory analysis, the process for constructing teacher's personal practical theories based on professional inquiry is established. Thus, the core practice in the construction of personal practical theory for teachers, "research-oriented practice", is revealed, and seven typical strategies that promote the construction of teacher's personal practical theoryis summarized. By reflecting on the process of teacher's professional growth, the theoretical and practical logic of constructing teacher's personal practical theory has been discovered, and a "practice-professional inquiry" orientation for teacher learning has been proposed. The research indicates that all teachers can establish a systematic perspective for thinking about problems through the construction of their personal practical theory, and can transform unconscious actions into purposeful practices, developing deep thinking about the essence and principles of education issues. In this way, teachers can reconstruct teaching theories, develop personal teaching expertise and characteristics through exploring teaching problems, there by promoting the gradual development of educatortype of teachers.

For preparation of a green biological hybrid flame retardant, chitosan-based core-shell flame retardant (CS@PA@MEL) was prepared by electrostatic interaction using green natural polymer chitosan (CS) as the 'core' and phytic acid (PA) and melamine (MEL) as the 'shell', to solve the flammability and low flame-retardant efficiency of biodegradable polymers. The structure of CS@PA@MEL was characterized by Fourier transform infrared spectroscopy (FTIR). The thermal stability, micro morphology and element composition of the hybrid structure were studied by thermogravimetric analysis (TG), Scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and element energy spectrum analysis. The results indicate that CS@PA@MEL exhibits characteristic absorption peaks of C-N, -C=N- and P-O, P=O. The introduction of PA and MEL significantly reduces the thermal decomposition rate of CS and increases the residual char rate. CS@PA@MEL exhibits a clear wrapped fold structure morphology, while the content of P and N elements has significantly increased. The above results confirm that PA and MEL have successfully achieved coating modification of CS. [ABSTRACT FROM AUTHOR]

In view of the current research situation of antibiotic water pollution in Baiyangdian Lake and relying on the current scientific research projects, a research type experiment is designed for the adsorption of ciprofloxacin in water by the hydrothermal synthesis of composite aerogel (CMC/CoNiFe-LDH) modified with cobalt nickel iron layered hydroxide (CoNiFe-LDH) based on carboxymethyl cellulose (CMC). The morphology, phase, and functional groups of CMC/CoNiFe-LDH are characterized using SEM, XRD, FTIR, etc. The effects of pH, reaction time, and initial concentration on adsorption efficiency are analyzed. The experimental results indicated that under the optimal experimental conditions, the adsorption capacity of CMC/CoNiFe-LDH for ciprofloxacin is 298.32 mg/g. The teaching experiment involves analytical chemistry, material chemistry, instrument analysis and other curriculum knowledge, which helps stimulate students' interest in experimental learning, cultivate innovative thinking and experimental hands-on ability, and improve the ability to use theoretical knowledge to solve practical problems. [ABSTRACT FROM AUTHOR]

BackgroundSuicidal ideation serves as a sensitive predictive indicator for non-suicidal self-injury （NSSI） behavior， and NSSI behavior brings profound effects to both mental and physical health of senior high school students. Existing studies have made exploration on the relationship among insomnia， anxiety and NSSI behavior in the general population， but the internal mechanism of NSSI behavior in senior high school students with suicidal ideation requires further study.ObjectiveTo explore the pathway of anxiety between insomnia and NSSI behavior in senior high school students， so as to provide references for the intervention on NSSI behavior in such demographic.MethodsFrom December 10 to 15， 2021， cluster sampling was adopted to select 2 572 senior high school students across three senior high schools in Hubei Province as the research objects. Assessment was conducted by using Insomnia Severity Index （ISI）， Generalized Anxiety Disorder Scale-7 item （GAD-7） and Adolescents Self-Harm Scale. Spearman correlation analysis was conducted to examine the correlation among scores of scales finished by senior high school students with suicidal ideation. Model 4 from the SPSS 20.0 Process 4.2 was employed to test the mediating path of anxiety between insomnia and NSSI behavior.ResultsA total of 2 421 valid questionnaires （94.13%） were recovered， which revealed 554 cases （22.88%） with suicidal ideation and 408 cases （16.85%） with NSSI behavior. The scores of ISI， GAD-7 and Adolescents Self-Harm Scale of senior high school students with suicidal ideation were higher than those of students without suicidal ideation （Z=17.124， 20.611， 21.314， P

Objective·To assess the levels of pregnancy-related stress, pre-pregnancy health care behaviors, and coping styles among pregnant women,analyze the influencing factors of pregnancy stress and provide insights for the management of pregnancy health in expectant mothers.Methods·A total of 265 pregnant women receiving treatment at the Obstetrics Clinic of the Affiliated Hospital of Zunyi Medical University from April to August 2022 were included as participants. General information questionnaires, pre-pregnancy health care behavior questionnaires, pregnancy stress scales and simple coping style questionnaires were utilized for data collection. After obtaining the consent of the patients, assessments on pregnancy stress levels, pre-pregnancy health care behaviors, and coping styles were conducted.Results·The overall average score for pregnancy stress among pregnant women was 1.05±0.41. Multiple linear regression analysis revealed that age, number of pregnancies, history of threatened abortion, fetal gender expectations, attending prenatal education classes or reviewing relevant manuals significantly influenced pregnancy-related stresses (P

In view of the time-varying nature of the single-satellite mission in the mega constellation, the resulting overload, the vulnerability of a single node, and the high reliability requirements of the network control plane, the topology control of satellite networks for multi-layer and multi-domain mega-constellation was studied. A multi-layer and multi-domain topology description model based on Beidou grid position code was proposed. Firstly, the concepts and definitions of layer, domain, slice and element were given to realize the unified characterization of the topological characteristics of satellite nodes and inter-satellite links, and to describe the connectivity state of satellite nodes and the network topology of the entire constellation. Secondly, a topology control architecture with the on-orbit controller as the core and the ground network control as the auxiliary, was designed to provide normal operation service guarantee. Finally, the simulation platform was used to verify and analyze the subdomain division and unified characterization of the mega-constellation. The results show that the proposed topology description model can improve the real-time and accuracy of the topology control process for mega-constellation satellite networks.

Aiming at the problem that traditional anti-jamming schemes cannot choose suitable anti-jamming strategies according to different types of jamming forms, an adaptive anti-jamming scheme based on meta-surface antenna was proposed. According to the incident direction of the expected signal and the jamming signal, the type of jamming was determined and the targeted anti-jamming scheme was formulated. Firstly, an improved sparsity adaptive matching pursuit (SAMP) algorithm was designed to estimate the direction of arrival (DOA). The multi-dimensional observation capability of meta-surface antenna could be used to estimate the source number and DOA of coherent signal sources with high precision under little snapshot sampling. Secondly, the DOA information of the signal was used to judge the existence of main-lobe interference and sidelobe interference, while the corresponding anti-jamming strategy was selected. When the main-lobe jamming existing, the multi-dimensional observation capability of the meta-surface antenna was used to configure the improved blocking matrix preprocessing structure on the antenna to achieve the main-lobe jamming suppression. When side-lobe jamming existing, a quadratic inequality linear power minimization algorithm was used to realize anti jamming. When two jamming forms exist at the same time, blocking matrix and beamforming were used to resist jamming. The simulation results show that the proposed scheme has better signal interference noise ratio (SINR) improvement for different jamming types. When both main-lobe and side-lobe jamming exist, the gain can be improved by up to 6 dB compared with the traditional scheme.