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Stress corrosion cracking (SCC) is one of serious aging degradation problems for the Alloy 600 components of pressurized water reactors (PWRs). In order to prevent SCC, various methods such as water jet peening (WJP), laser peening (LP), surface polishing have been used to introduce compressive stresses at the surfaces of the PWR components. However, it has been reported that such compressive residual stress introduced by these methods might be relaxed during the practical operation, because of high temperature environment. In this study, the hardness reduction behavior of the Alloy 600 processed by LP, Buff and WJP in the thermal aging process has been investigated to estimate the stability of the residual stress improving effect by each method, based on the fact that there is a correlation between the compressive residual stress relaxation and the decrease of hardness. The behavior of the residual stress relaxation in the processed materials in the high temperature environment has been discussed with kinetic analysis.

Objectives: To investigate the effects of etibatide combined with emergency percutaneous coronary intervention (PCI) on blood perfusion and cardiac function in acute myocardial infarction (AMI) patients. Methods: This was a prospective, randomized, controlled study. From November 2015 to June 2019, 196 patients with ST-segment elevation myocardial infarction (STEMI) undergoing emergency PCI admitted to Baoding First Central Hospital were enrolled. The 196 STEMI patients were randomly divided into experimental group and control group. In the experimental group, STEMI patients were treated with emergency PCI + etibatide; while in the control group, only PCI was performed. Observation indexes included: general data, myocardial perfusion and cardiac function indexes and major adverse cardiac events (MACE). Results: There was no significant difference in general data between the two groups (P > 0.05). The rate of ST-segment resolution (STR) in the experimental group was better than that in the control group (P < 0.05). In myocardial contrast echocardiography (MCE), higher peak intensity (PI) and shorter time-to-peak (TP) were observed in the experimental group compared with the control group (P < 0.05). The platelet aggregation rate was compared between the two group at the time points of before PCI, after PCI and two hour after drug withdrawal, and there was no significant change in the platelet aggregation rate of the control group between different time points (before PCI, after PCI and two hour after drug withdrawal); while the platelet aggregation rate of the experimental group was significantly lower after PCI and two hour after drug withdrawal than that before PCI (P < 0.05), and an obviously decreased platelet aggregation rate was found in the experimental group(P < 0.05). After three months of follow-up, there was one case of MACE in the experimental group and 1 case of MACE in the control group, without any difference in the incidence of MACE between the two groups (P > 0.05). Conclusion: Etibatide combined with emergency PCI could improve myocardial reperfusion and cardiac function in patients with acute STEMI without increasing the incidence of MACE. doi: https://doi.org/10.12669/pjms.37.1.2950 How to cite this:Hu Y, Qi F, Yu L, Geng W. Effects of etibatide combined with emergency percutaneous coronary intervention on blood perfusion and cardiac function in patients with acute myocardial infarction. Pak J Med Sci. 2021;37(1):185-190. doi: https://doi.org/10.12669/pjms.37.1.2950 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Introduction Mesenchymal stem cells (MSCs) exert immunomodulatory functions by inducing the development and differentiation of naive T cells into T cells with an anti-inflammatory regulatory T cell (Treg) phenotype. Our previous study showed that hepatocyte growth factor (HGF) secreted by MSCs had immunomodulatory effects in the context of lipopolysaccharide (LPS) stimulation. We hypothesized that HGF is a key factor in the MSC-mediated regulation of the T helper 17 (Th17) cell/regulatory T (Treg) cell balance. Methods We investigated the effects of MSCs on the differentiation of CD4+ T cells and the functions of Th17/Treg cells in response to LPS stimulation by performing in vitro coculture experiments. MSCs were added to the upper chambers of cell culture inserts, and CD4+ T cells were plated in the lower chambers, followed by treatment with LPS or an anti-HGF antibody. Th17 (CD4+CD3+RORrt+) and Treg (CD4+CD25+Foxp3+) cell frequencies were analysed by flow cytometry, and the expression of Th17 cell- and Treg cell-related cytokines in the CD4+ T cells or culture medium was measured by quantitative PCR (qPCR) and enzyme-linked immunosorbent assay (ELISA), respectively. Neutrophil functions were determined by flow cytometry after a coculture with Th17/Treg cells. Results The percentage of CD4+CD25+Foxp3+ cells was significantly increased in the CD4+ T cell population, while the percentage of CD4+CD3+RORrt+ cells was significantly decreased after MSC coculture. However, the MSC-induced effect was significantly inhibited by the anti-HGF antibody (p p p p p p p Conclusion These data suggested that MSCs induced the conversion of fully differentiated Th17 cells into functional Treg cells and thereby modulated the Th17/Treg cell balance in the CD4+ T cell population, which was partly attributed to HGF secreted by the MSCs.

The article has been withdrawn at the request of the authors and editor of the journal Current Neurovascular Research. Bentham Science apologizes to the readers of the journal for any inconvenience this may have caused. The Bentham Editorial Policy on Article Withdrawal can be found at https://benthamscience.com/editorial-policies-main.php Bentham Science Disclaimer: It is a condition of publication that manuscripts submitted to this journal have not been published and will not be simultaneous-ly submitted or published elsewhere. Furthermore, any data, illustration, structure or table that has been published elsewhere must be reported, and copyright permission for reproduction must be obtained. Plagiarism is strictly forbidden, and by submit-ting the article for publication the authors agree that the publishers have the legal right to take appropriate action against the authors, if plagiarism or fabricated information is discovered. By submitting a manuscript, the authors agree that the copyright of their article is transferred to the publishers if and when the article is accepted for publication.

Objective The aim of this study was to determine the role of spinal adenosine A1 receptors (A1Rs) in the analgesic effects of electroacupuncture (EA) for neuropathic pain. Methods We performed EA for 30 minutes at the zusanli acupoint in the legs of rats with previously induced chronic constriction injuries and observed the mechanical and thermal pain thresholds 1 hour later. We also examined adenosine levels by high-performance liquid chromatography and A1R expression in the L4–6 spinal cord by western blot analysis. We then injected A1R short interfering RNA (AV-shA1RNA) into the L4–6 spinal cord to downregulate A1R expression and re-examined the mechanical and thermal pain thresholds. Results Adenosine levels and A1R expression in the L4–6 spinal cord were increased at 1 hour after EA. In addition, EA exhibited an analgesic effect that was reversed by AV-shA1RNA. Conclusions Our results suggest that EA at the zusanli acupoint elicits an analgesic effect against neuropathic pain, mediated by A1Rs in the spinal cord.

A novel Gram-stain-negative, aerobic strain, designated Y22

This study aims to compare the prevalence of sexually transmitted infections (STIs) with semen quality in men from couples with primary and secondary infertility. Semen samples were collected from 133 men who requested fertility evaluation. Seminal tract infection with Ureaplasma spp. (UU), Mycoplasma hominis (MH), Mycoplasma genitalium (MG), Chlamydia trachomatis (CT), Neisseria gonorrhoeae (NG), and herpes simplex virus-2 (HSV-2) was assessed by PCR-based diagnostic assays. Among all patients, the prevalence of STIs was higher in men from couples with primary infertility than that in men from couples with secondary infertility (39.7% vs 21.7%, P = 0.03). The prevalence of UU was 28.8% and 13.3% in men from couples with primary and secondary infertility, respectively. Men from couples with primary infertility were more likely to be positive for UU than men from couples with secondary infertility (P = 0.04). Regarding the UU subtype, the prevalence of Ureaplasma urealyticum (Uuu) and Ureaplasma parvum (Uup; including Uup1, Uup3, Uup6, and Uup14) did not differ between the two groups. No associations between the prevalence rates of MH, MG, and CT were found in men from either infertility group. A lower sperm concentration was associated with STI pathogen positivity in men with primary infertility according to the crude model (P = 0.04). The crude and adjusted models showed that semen volume (both P = 0.03) and semen leukocyte count (both P = 0.02) were independently associated with secondary infertility. These findings suggest the importance of classifying the type of infertility during routine diagnosis of seminal tract infections.

In this paper, a low-power analog front-end (AFE) of BJT-based temperature sensor for implanted Radio Frequency Identification (RFID) is designed. Firstly, the architecture of BJT-based temperature sensor is described. Then a low-power bias circuit in the AFE is proposed to reduce the power consumption, and the bipolar core is optimized to improve the inaccuracy of temperature sensor. At last, the simulation is performed and the chip is fabricated in SMIC 0.18μm technology. The current is 2.6μA with a supply voltage of 1.8V and the current is 1μA when the circuit is disabled. The inaccuracy is 0.6°C from 25°C to 45°C. The power supply rejection ratio (PSRR) is 50dB at DC and 37dB at 1MHz respectively.

To observe and evaluate the effects of transcutaneous electrical acupoint stimulation (TEAS) at different time points on postoperative analgesia in perioperative period in patients undergoing shoulder arthroscopic surgery, and to explore the optimal time to use TEAS for shoulder arthroscopic surgery.A total of 120 patients undergoing unilateral shoulder arthroscopy under general anesthesia, graded withⅠtoⅡaccording to ASA criteria were randomly divided into 3 groups, 40 patients in each one. The patients in the group A were treated with preoperative TEAS at sham acupoints combined with postoperative TEAS at Hegu (LI 4) and Neiguan (PC 6); the patients in the group B were treated with preoperative TEAS at Hegu (LI 4) and Neiguan (PC 6) combined with postoperative TEAS at sham acupoints; the patients in the group C were treated with TEAS at sham acupoints before and after operation. The parameters of TEAS were dilatational wave, 2 Hz/100 Hz in frequency, 30 min. When the resting-state visual analogue scale (VAS) of incision was more than 3 points, the patient-controlled intravenous analgesia (PCIA) pump of sufentanil was administered to maintain the VAS no more than 3 points. The time point when PCIA pump was firstly used, the used dose of sufentanil and effective pressing number of PCIA pump within 24 hours after surgery were recorded. Intraoperative anesthetic doses were recorded in the three groups. The resting-state and task-state VAS were evaluated at 0, 6, 12, 24 hours after surgery; the patient's satisfaction rate and adverse effects were recorded.The time when PCIA pump was firstly used in the group A and the group B was significantly longer than that in the group C, and the used dose of sufentanil and effective pressing number of PCIA pump within 24 hours after surgery in the group A and group B were significantly less than those in the group C (allPerioperative TEAS could improve the postoperative analgesia in patients undergoing arthroscopic shoulder surgery, delay the time when PCIA pump is firstly used, reduce the dosage of postoperative analgesics and adverse events. Compared before surgery, postoperative TEAS has better analgesia.

Fiber-reinforced materials have widespread applications, which prompt the study of the effect of fiber reinforcement. Research studies have indicated that thermal conductivity cannot be considered as a constant, which is closely related to temperature change. Based on those studies, we investigate the fiber-reinforced generalized thermoelasticity problem under thermal stress, with the consideration of the effect of temperature-dependent variable thermal conductivity. The problem is assessed according to the L-S theory. A fiber-reinforced anisotropic half-space is selected as the research model, and a region of its surface is subjected to a transient thermal shock. The time-domain finite element method is applied to analyze the nonlinear problem and derives the governing equations. The nondimensional displacement, stress, and temperature of the material are obtained and illustrated graphically. The numerical results reveal that the variable conductivity significantly influences the distribution of the field quantities under the fiber-reinforced effect. And also, the boundary point of thermal shock is the most affected. The obtained results in this paper can be applied to design the fiber-reinforced anisotropic composites under thermal load to satisfy some particular engineering requirements.

The purpose of this paper is to investigate the preparation of peanut antioxidant peptides by Bacillus subtilis solid state fermentation method and to provide a theoretical basis for further investigating deep processing products of fermentation peanut meal. The preparation technics for peanut antioxidant peptides optimized with the soluble nitrogen concentration of peptides, 1, 1-diphenyl-2-picryl-hydrazyl (DPPH) and hydroxyl free radicals scavenging rates of fermentation broth as the indexes of investigation including the cell age was 20h, bacterial suspension volume was 3.0mL, fermentation temperature was 40°C, nutrient salt solution was 15mL, the fermentation time was 42h, water bath temperature was 45°C, and water bath time was 3h. The research shows that IC50 values for peptides scavenging of DPPH, hydroxyl and superoxide anion free radicals, iron and copper ion chelating rates, lipid peroxidation inhibiting rate, iron and molybdenum reducing activity were 3.48mg/mL, 6.24mg/mL, 2.06mg/mL, 0.54mg/mL, 1.19mg/mL, 4.56mg/mL, 9.58mg/mL and 2.17mg/mL, respectively.

In this study, a set of real-time PCR primers for the detection of aflatoxin in peanut was successfully designed according to the AFLR gene of Aspergillus niger. Upstream primer was 5'-AACCTGATGACGACTGATAT-3'; Downstream primer was 5'-AGCACCTTGAGAACGATAA-3'; The real-time PCR detection system established in this study had good specificity, and the sensitivity of DNA detection can reach 3×10-13 ng/ul. The correlation coefficient between the contents of aflatoxin in peanut samples and PCR Ct of Real-time was-0.718, and the correlation coefficient was significantly negative.

In order to inhibit the contamination of peanut in the storage and transportation process, the research on the anti-Aspergillus flavus of the composite coating of the lemon aldehyde and chitosan was studied. The optimum formula of the coating was determined by orthogonal test. The optimum formula was that the concentration of chitosan, 6mg/ml, 0.01mg/ml, glycerol concentration of 9mg/ml. Using this formula, the growth of Aspergillus niger could be significantly inhibited.

OBJECTIVE: To compare the safety of sevoflurane anesthesia with laryngeal mask and tracheal intubation in cesarean section in women with heart disease. METHODS: Fifty-two pregnant women with heart diseases undergoing cesarean section were randomized into laryngeal mask (LAM) group and tracheal intubation group. In LAM group, 6% sevoflurane was given at the rate of 6 L/min for induction with a maintenance sevoflurane concentration of 3%. In the intubation group, 1.5 mg/kg propofol and 1 μg/kg remifentanil were injected intravenously, and after achieving D0 with Narcotrend monitoring, 0.9 mg/kg rocuronium was injected and intubation was performed 1 min later. The systolic blood pressure (SBP), diastolic blood pressure (DBP), mean arterial pressure (MAP), and heart rate (HR) were recorded in the two groups before anesthesia induction (T(0)), at intubation or laryngeal mask placement (T(1)), skin incision (T(2)), and extubation or laryngeal mask removal (T(3)). The surgery to fetal birth time, uterine incision to fetal childbirth time, drug discontinuation to awake time, and newborn Apgar scores were also recorded. Sevoflurane consumption and maternal comfort during hospitalization were compared between the two groups. RESULTS: In LAM group, HR and MBP at T(1) and T(3) were significantly lower than those in the intubation group (P < 0.05). The drug discontinuation to extubation time and to awaken time were significantly shorter in LAM group than in the intubation group (P < 0.05), but the operation time and fetal child birth time were comparable between the two groups (P>0.05). The women in LAM group reported better physical and psychological comforts than those in the intubation group (P < 0.05). The neonatal Apgar scores and the scores of health education, satisfaction with hospital environment and service were all similar between the two groups (P>0.05). CONCLUSION: Sevoflurane anesthesia with laryngeal mask can achieve satisfactory anesthetic effects in cesarean section in women with heart disease.

The laryngeal mask airway (LMA) is a supraglottic device that is commonly used to provide lung ventilation during general anesthesia. LMA placement needs to be confirmed to provide adequate lung ventilation. To investigate the feasibility of using ultrasound examination, compared with clinical tests and fiberoptic laryngoscopy, to confirm LMA placement, we performed a clinical study of 64 female patients classified as American Society of Anesthesiologists Physical Status I or II who were scheduled for gynecologic surgery with LMA insertion for airway management. After insertion, placement of the LMA was confirmed by clinical tests, ultrasound examination and fiberoptic laryngoscopy. Of the 64 women, placement was confirmed as acceptable in 89.1% by clinical tests, in 59.4% by fiberoptic laryngoscope assessment and in 67.2% by ultrasound examination. With respect to patients with oropharyngeal leaks classified as high, there were no differences in confirmation of acceptable placement between clinical tests and ultrasound examinations (p = 0.092), but the number of patients determined to have acceptable placement by ultrasound examination was greater than that determined by fiberoptic laryngoscopy (p = 0.034). Thus, ultrasound examination is a superior technique for confirming the seal on the LMA.

There are numerous studies implicating that EphB receptors and ephrinB ligands play important roles in modulating the transduction of spinal nociceptive information. EphrinB-EphB signaling may contribute to hyperalgesia via various kinds of downstream molecules, the mechanisms of which have not been completely understood.The aim of the present study was to identify whether ephrinB-EphB signaling could contribute to hyperalgesia through ERK5/CREB pathway.Controlled animal study.University laboratory.This study attempted to detect the changes of pain behaviors and the protein level of p-ERK5 and p-CREB by activating EphB receptors in the spinal cord of rats. To further confirm our hypothesis, we designed LV-siRNA for knockdown of spinal ERK5. When ERK5 was inhibited, we recorded the changes of spinal p-CREB expression and the pain behaviors of rats after activating EphB receptors. We also confirmed this conclusion in rat CCI model. Statistical analyses were performed using GraphPad Prism 5.Intrathecal injection of ephrinB2-Fc in rats evoked thermal hyperalgesia and mechanical allodynia, along with activation of ERK5 and CREB in the spinal cord. Knockdown of ERK5 inhibited ephrinB2-Fc-induced CREB activation and hyperalgesia. Blocking EphB receptors prevented CCI-induced neuropathic pain and spinal ERK5/CREB activation.More underlying mechanisms that underlie the relationship between ephrinB-EphB signaling and ERK5/CREB pathway will need to be explored in future studies.Our study suggests that ERK5/CREB pathway plays important roles in the transduction of nociceptive information associated with ephrinB-EphB signaling. This study provides further understanding of the downstream mechanisms of ephrinB-EphB signaling and helps to explore new targets for treating pathological pain.

This paper studied the extraction of peanut protein peptone hydrolysate from cold pressed peanut meal by papain to provide a theoretical basis on peanut meal special microorganism culture makings products for further research. The study use orthogonal test method to optimize the method of papain preparation of peanut peptone, the best preparation conditions were: enzymolysis temperature 55 °C, pH7.5, substrate concentration 3%, the amount of enzyme 6%, enzymolysis time 6 hours. The Protein yield was 52.02% and the content of amino nitrogen was 0.772 mg %by this perparation condition.

Single factor and Plackett-Burman design were used to determine the key environmental factors for Aspergillus flavus growth and aflatoxin production. The results showed that the key factors were culture time, moisture content. So Controling of moisture was crucial for Aflatoxin contamination prevention and control.

The objective of this work is to study on the preparation of peanut protein peptide by lactobacillus solid state fermentation method and to provide a theoretical basis for further investigating peanut meal special protein material product. Results indicated that the soluble nitrogen concentration of peanut protein peptide could reach 70.92mg/ml, 1, 1-diphenyl-2-picryl-hydrazyl (DPPH) and hydroxyl free radicals scavenging rates were 95.00% and 86.28%, respectively, under the following optimum conditions: addition of nutrient salt solution volume of 25ml, lactobacillus liquid volume of 5ml, temperature of 25.0 °C, and time of 72h. Peanut protein peptide had good antioxidant activities.

Two [M3L3]6 +-type organo-palladium(II) macrocyclic host molecules, {[(phen)Pd]3(4,7-phen)3}(NO3)6, 1·6NO3−; {[(dtod-phen)Pd]3(4,7-phen)3}(NO3)6, 2·6NO3−, (where M = (4,7-phen)Pd, (dtod-phen)Pd; 4,7-phen = 4,7-phenanthroline (L), phen = 1,10-phenanthroline, dtod-phen = 5,6-di(1′,4′,7′,10′-tetraoxododecanoxy)-1,10-phenanthroline), have been synthesized by metal-directed self-assembly in aqueous solution. These basket-shaped hosts bearing syn, syn, syn orientations and their anion complexes, have been fully characterized by 1H NMR, cold-spray ionization mass spectrometry (CSI-MS) and in the case of basket-shaped host 1*PF6− by X-ray single-crystal diffraction analysis. On the basis of anion binding structure within the cavity of 1, the molecule basket 2 possessing a hydrophobic inner cavity expanded with hydrophilic polyethyleneglycol chains was successfully designed for encapsulating one giant anion [(C2B9H11)2Co]− in water and the host–guest interaction was studied by 1H NMR titration and CSI-MS.

Temper bead welding (TBW) is one effective repair welding method for the large-scale nuclear power plants. Consistent Layer (CSL) technique is the theoretically most authoritative method among the five temper bead welding techniques. However in the actual operation, CSL technique is difficult to perform, and non-CSL techniques (Controlled Deposition technique, Half Bead technique, et al) are mainly used in the actual repair process. The thermal cycles in heat affect zone (HAZ) of non-CSL technique are more complicated than that of CSL techniques. Through simplifying the complicated thermal cycles to 4 types of thermal cycles, the neural network-based hardness prediction system for non-CSL techniques has been constructed. The hardness distribution in HAZ of non-CSL techniques was calculated based on the thermal cycles numerically obtained by finite element method (FEM). The predicted hardness was in good accordance with the experimental results. It follows that the thermal cycle simplification methods are effective for estimating the tempering effect during temper bead welding of non-CSL techniques.

A chiral [M3L3]6+-type nanobowl reported here was self-assembled from cis-protected mono-palladium complex [(RRdiph)Pd](NO3)2 (where RRdiph= (1R,2R)-(+)-1,2-diphenylethylenediamine) as chiral corners and 4,7-phenanthroline ligand (L) as linkers in aqueous media. The hydrophobic cavity-containing metallo-macrocycle [Pd3L3]6+·6NO3 (1) with a syn, syn, syn orientation has been characterized by 1H NMR spectroscopy, elemental analysis, CD spectra and X-ray diffraction determination.

To optimize aflatoxin production of Aspergillus flavus on peanut, the response surface methodology were applied based on previous experiment. The results showed that the influence of water content of peanuts,time and relative humidity were obvious and were not linear relationship. The optimal aflatoxin production conditions were that water content of peanuts was12%, the time was 7 days, relative humidity was 80%.

The objective of this work is to study on preparation of peanut protein peptide by bacillus subtilis solid state fermentation method. Results indicated that soluble nitrogen concentration of protein peptide could reach 122.86mg/mL, 1, 1-diphenyl-2-picryl-hydrazyl (DPPH) and hydroxyl free radicals scavenging rates were 85.22% and 84.88%, respectively, under the following optimum conditions: nutrient salt solution of 16.3mL, bacterial suspension volume of 3.8mL, temperature of 45°C, and time of 41h. IC50values for scavenging of DPPH, hydroxyl and superoxide anion free radicals rates, iron and copper ion chelating rates, inhibition rate of anti-lipid peroxidation were 2.88mg/mL, 4.63mg/mL, 1.22mg/mL, 0.04mg/mL, 0.94mg/mL, 3.78mg/mL, respectively. When absorbance value of iron and molybdenum reduction capacities was 0.5, the required protein peptide concentrations were 7.28mg/mL and 1.85mg/mL, respectively.

To explore the anesthetic effect and safety of ultrasound-guided thoracic paravertebral blockade in video-assisted thoracoscopic sympathectomy for treatment of palmar hyperhidrosis.A total of 120 patients undergoing video-assisted thoracoscopic sympathectomy for moderate or severe hyperhidrosis were randomized to receive ultrasound-guided thoracic paravertebral blockade (group A, n=60) or general anesthesia with tracheal intubation (group B, n=60). In both groups routine monitoring and radial artery catheterization were used. The patients in group A were given oxygen inhalation via a nasal tube after thoracic paravertebral blockade, and those in group B had intratracheal intubation. Blood gas analyses were conducted 5 min before and 5 min after the operation and the clinical outcomes and complications were recorded in each group.All the patients completed the operations safely and none of the patients with thoracic paravertebral blockade required conversion to general anesthesia. Significant differences were recorded between groups A and B in anesthetic preparation time (6.26∓2.09 vs 46.32∓15.76 min), awakening time (6.26∓2.09 vs 46.32∓15.76 min), and mean hospitalization expense (6355.54∓426.00 vs 8932.25∓725.98 RMB Yuan). Compared with those in group B, the patients in group A showed a significantly lower rate of postoperative throat discomfort (0% vs 100%), a shorter monitoring time (2 h vs 12 h), and faster recovery time for food intake (2 h vs 6 h). The parameters of artery blood gas analysis both before and after the operation were similar between the two groups, but the postoperative variations differed significantly between the two groups in pH value and PaCOUltrasound-guided thoracic paravertebral blockade is safe and effective in video-assisted thoracoscopic sympathectomy for palmar hyperhidrosis and is associated with less complications and better postoperative recovery.

Under the action of wind, traffic, and other influences, long-span bridges are prone to large deformation, resulting in instability and even destruction. To investigate the dynamic characteristics of a long-span concrete-filled steel tubular arch bridge, we chose a global navigation satellite systems-real-time kinematic (GNSS-RTK) to monitor its vibration responses under ambient excitation. A novel approach, the use of complete ensemble empirical mode decomposition with adaptive noise combined with wavelet packet (CEEMDAN-WP) is proposed in this study to increase the accuracy of the signal collected by GNSS-RTK. Fast Fourier transform (FFT) and random decrement technique (RDT) were adopted to calculate structural modal parameters. To verify the combined denoising and modal parameter identification methods proposed in this paper, we established the structural finite element model (FEM) for comparison. Through simulation and comparison, we were able to draw the following conclusions. (1) GNSS-RTK can be used to monitor the dynamic response of long-span bridges under ambient excitation, (2) the CEEMDAN-WP is an efficient method used for the noise reduction of GNSS-RTK signals, (3) after signal filtering and noise reduction, structural modal parameters are successfully derived through RDT and illustrated graphically, and (4) the first-order natural frequency identified by field measurement is slightly higher than the FEM in this work, which may have been caused by bridge damage or the inadequate accuracy of the finite element model.

The peripheral malfunction will cause the nodes fail to work when there is no central control node in the large scale sensor network. The network cant guarantee the continuity of the communication and service and the communication efficiency will be low in this situation. In order to fix the issue, the paper proposes a correcting fusion algorithm for the sensor network data communication. When the collision of the communication data happens in the sensor network due to the failure of the nodes, the correcting fusion algorithm can ensure the effective data fusion between the fault nodes and other nodes to guarantee the communication to the maximum extent. The experiment indicates the algorithm can increase the efficiency of the sensor network to achieve the satisfactory results.

The pressure vessels of aged nuclear power plants are needed to repair or maintain, and temper bead welding (TBW) is one effective repair welding method instead of post weld heat treatment. For TBW, toughness is the key criteria to evaluate the tempering effect. A neural network based method for toughness prediction in heat affected zone (HAZ) of low alloy steel has been investigated to evaluate the tempering effect in TBW. On the basis of experimentally obtained database, the new toughness prediction system was constructed by using radial basis function neural network. With it, the toughness distribution in HAZ of TBW was calculated based on the thermal cycles numerically obtained by finite element method (FEM). The predicted toughness was in good accordance with the experimental results. It follows that our new prediction system is effective for estimating the tempering effect during TBW and hence enables us to assess the effectiveness of TBW before the actual repair welding.