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The precipitates in welded joint heat affected zone (HAZ) and base metal of TP347H stainless steel were observed and analyzed by SEM, TEM and EPMA. The results show that precipitate of NbC can be observed in welded joint HAZ in as-welded, and more NbC precipitate in high temperature service. The size of primary NbC in base metal ranges from tens of nanometers to hundreds of nanometers, but only tens of nanometers of the precipitated NbC. The fine precipitate of NbC is mainly distributed in the crystal, however, continuous distribution of NbC is also observed on the grain boundary of the service joint. Cr carbide precipitates at the grain boundary, and some of particles distribute continuously on the grain boundary after service. The fine NbC precipitated in the crystal strengthens the matrix, and the continuous distribution of Nb and Cr carbides on the grain boundary reduces the interfacial bonding strength, then both of which result decrease of the material plasticity.

In this paper, we investigate the time-periodic solution to a coupled compressible Navier- Stokes/Allen-Cahn system which describes the motion of a mixture of two viscous compressible fluids with a time periodic external force in a periodic domain in ℝN. The existence of the time-periodic solution to the system is established by using an approach of parabolic regularization and combining with the topology degree theory, and then the uniqueness of the period solution is obtained under some smallness and symmetry assumptions on the external force.

Graph convolutional networks (GCNs) have made significant progress in the skeletal action recognition task. However, the graphs constructed by these methods are too densely connected, and the same graphs are used repeatedly among channels. Redundant connections will blur the useful interdependencies of joints, and the overly repetitive graphs among channels cannot handle changes in joint relations between different actions. In this work, we propose a novel relation selective graph convolutional network (RS-GCN). We also design a trainable relation selection mechanism. It encourages the model to choose solid edges to work and build a stable and sparse topology of joints. The channel-wise graph convolution and multiscale temporal convolution are proposed to strengthening the model’s representative power. Furthermore, we introduce an asymmetrical module named the spatial-temporal attention module for more stable context modeling. Combining those changes, our model achieves state-of-the-art performance on three public benchmarks, namely NTU-RGB+D, NTU-RGB+D 120, and Northwestern-UCLA.

A high maternal triglyceride (mTG) level during early pregnancy is linked to adverse pregnancy outcomes, but the use of specific interventions has been met with limited success. A retrospective cohort study was designed to investigate the impact of gestational weight gain (GWG) on the relationship between high levels of mTG and adverse pregnancy outcomes in normal early pregnancy body mass index (BMI) women. The patients included 39,665 women with normal BMI who had a singleton pregnancy and underwent serum lipids screening during early pregnancy. The main outcomes were adverse pregnancy outcomes, including gestational hypertension, preeclampsia, gestational diabetes, cesarean delivery, preterm birth, and large or small size for gestational age (LGA or SGA) at birth. As a result, the high mTG (≥2.05mM) group had increased risks for gestational hypertension ((Adjusted odds ratio (AOR), 1.80, 95% CI, 1.46 to 2.24)), preeclampsia (1.70, 1.38 to 2.11), gestational diabetes (2.50, 2.26 to 2.76), cesarean delivery (1.22, 1.13 to 1.32), preterm birth (1.42, 1.21 to 1.66), and LGA (1.49, 1.33 to 1.68) compared to the low mTG group, after adjustment for potential confounding factors. Additionally, the risks of any adverse outcome were higher in each GWG subgroup among women with high mTG than those in the low mTG group. High mTG augmented risks of gestational hypertension, preeclampsia, preterm birth, and LGA among women with 50th or greater percentile of GWG. Interestingly, among women who gained less than the 50th percentile of GWG subgroups, there was no relationship between high mTG level and risks for those pregnancy outcomes when compared to low mTG women. Therefore, weight control and staying below 50th centile of the suggested GWG according to gestational age can diminish the increased risks of adverse pregnancy outcomes caused by high mTG during early pregnancy.

Explore the feasibility and effectiveness of accepting mind mapping combined with problem-based learning (PBL) teaching method in the standardized training of emergency surgery residents in the multi-disciplinary team (MDT) model of emergency trauma. Eighty-nine doctors under training who rotated in the Department of Emergency Surgery of the First Affiliated Hospital of Anhui Medical University from January 2021 to January 2022 were selected as the study subjects, and randomly divided into a group receiving mind mapping combined with PBL teaching and a group receiving traditional lecture-based learning teaching. Mini-clinical evaluation exercise (Mini-CEX), direct observation of procedural skills (DOPS), teaching adherence, and satisfaction assessments were completed at the time of discharge from the department. There were no significant differences between the observation and control group trainees in terms of gender, age, education, and entry grades. Both groups of doctors were better able to participate in their respective teaching modes and made significant progress. The participants in the observation group had significantly higher Mini-CEX, DOPS, and teaching satisfaction scores than the control group (P .05). Under the MDT model of emergency trauma, the combination of mind mapping and PBL teaching can improve the comprehensive clinical ability of the trainees more than participating in the traditional lecture-based learning teaching, which is worth promoting and implementing in the clinical standardized training.

Metal mining is one of the main contributors of soil heavy metals. Previous studies examining the impact of metal mining on surrounding soil have mainly focused on one or a few metal mining areas. However, such studies cannot effectively inform the management of heavy metal pollution in soil at an inter-provincial scale. As part of this study, literature was collected on soil heavy metals (i.e., As, Cd, Cr, Cu, Hg, Ni, Pb, and Zn) affected by metal mining in regions of Southwest China (i.e., Yunnan Province, Sichuan Province, Guizhou Province, Chongqing Municipality, and Tibet Autonomous Region); Next, the impact of metal mining on the soil concentrations of these metals was quantified through meta-analysis, and the relationships between the selected factors (i.e., different sub-regions, metal minerals, and land-use types) and soil heavy metal concentrations were explored. Finally, the literature data was tested for publication bias. The results showed that metal mining in Southwest China has significantly increased the concentrations of heavy metals in topsoil. The different metals were ranked according to their weight effect sizes (ES

IntroductionConventional intracytoplasmic sperm injection (ICSI) is a widely used treatment for couples with severe male infertility. However, there are controversies regarding the selection and the damage to gametes during the ICSI procedure. Although preimplantation genetic testing for aneuploidies (PGT-A) can give genetic information about embryos for transfer and improve fertility rate, and it is widely used in women with recurrent spontaneous abortion or advanced age, PGT-A is not only more expensive but also has unclear effectiveness with respect to the improvement of fertility rate among couples with severe male infertility. High-quality, well-powered randomised clinical trials (RCTs) comparing ICSI+PGT-A and ICSI are lacking.Methods and analysisThis is a protocol for a multicenter, open-label RCT in four reproductive medical centers qualified for PGT technique in China. We will study couples with severe male infertility scheduled for their fertility treatment. After the blastocyst culture, eligible participants are randomised to the ICSI+PGT-A group or the conventional ICSI group in a 1:1 ratio. Other assisted reproductive procedures are similar and parallel between the two groups. The primary outcome will be live birth rate and cumulative live-birth rate . Secondary outcomes will be embryo implantation rate, biochemical pregnancy rate, clinical pregnancy rate, spontaneous abortion rate, ongoing pregnancy rate, preterm birth rate, fetal chromosomal abnormality rate, birth defect rate and treatment complications. To demonstrate or refute a difference between the two groups, we plan to include 188 participants in each group; taking consideration of 20% of dropout, the total target sample size is 450.Ethics and disseminationEthical approval was obtained from International Peace Maternity and Child Health Hospital of Shanghai Jiao Tong University Medical Science Research Ethics Committee (GKLW2016-16). Informed consent will be obtained from each participant. The findings will be disseminated to the public through conference presentations and publication in peer-reviewed scientific journals.Trial registration numberClinicalTrials.gov, NCT02941965.

Topical administration of triptolide (TP) is effective in the treatment of rheumatoid arthritis (RA), but it can also induce skin irritation. Previous studies have used data mining strategies to analyze the application of Tripterygium wilfordii in the treatment of RA and have shown that TP and ferulic acid (FA) can be used in combination due to their component compatibility. The aims of the present study were to investigate the mechanisms underlying the effects of TP treatment and to identify its effects on metabolism and oxidative damage in the skin. MTT assay results suggested that the HaCaT cell survival rate was significantly increased when the compatibility ratio of TP to FA was 1:100. Moreover, the combination of TP with FA (TP + FA) did not significantly affect the activities of the cytochrome P40 (CYP) enzymes CYP family 1 subfamily A member 2 (CYP1A2), CYP2E1 and CYP3A4, when used as a ‘cocktail’. It was found that TP + FA significantly decreased the production levels of reactive oxygen species (ROS), superoxide dismutase and malondialdehyde in HaCaT cells, while significantly increasing levels of glutathione and catalase. In addition, TP + FA significantly increased nuclear factor erythroid 2-related factor 2 protein expression, compared with TP alone. Thus, the present results indicated that the underlying mechanism of TP + FA efficacy may be related to decreased ROS production level in HaCaT cells, increased production levels of key antioxidant factors and increased antioxidant activity of the epidermis, all of which were correlated with a protective effect against oxidative damage.

In this paper, we study a free boundary problem for the 1D viscous radiative and reactive gas. We prove that for any large initial data, the problem admits a unique global generalized solution. Meanwhile, we obtain the time-asymptotic behavior of the global solutions. Our results improve and generalize the previous work.

In order to find out the causes of weld cracks in the main steam pipe welded joint of a power plant, a series of relevant tests are specially formulated, which include room temperature tensile and high temperature tensile test, room temperature impact test, the crack tip metallographic observation, crack fracture scanning electron microscope observation, oxide film thickness measurement, and so on. By analyzing the metallographic photographs of the crack, the crack character is preliminarily determined. In addition, the direction of crack extension is determined by the thickness of oxide film in different parts. The crack failure mechanism has been identified. The results show that the welding heat crack occurs in 1# crack initiation position; and the crack initiation in 2# weld crack (primary crack) position is caused by the root defect of welding seam and lead to a high brittleness, which results in the crack failure by crack propagating in operational process gradually.

In order to increase the stability and solubility of essential oil in Jieyu Anshen Formula, this study was to prepare the essential oil into liposomes. In this experiment, the method for the determination of encapsulation efficiency of liposomes was established by ultraviolet spectrophotometer and dextran gel column. The encapsulation efficiency and particle size of liposomes were used as evaluation indexes for single factor investigation and Box-Behnken design-response surface method was used to optimize the design. Then the optimal formulation of volatile oil liposome was characterized using methyleugenol, elemin, β-asarone and α-asarone as index components. Finally, the in vitro transdermal properties of liposomes were studied by modified Franz diffusion cell. The results showed that the concentration of lecithin, the mass ratio of lecithin to volatile oil, and the stirring speed were the three most significant factors affecting the liposome preparation. The optimum formulation of volatile oil liposome was as follows: the concentration of lecithin was 7 g·L~(-1); mass ratio of lecithin to volatile oil was 5∶1; and the stirring speed was 330 r·min~(-1). Under such conditions, the prepared liposomes had blue emulsion light, good fluidity, half translucent, with particle size of(102.6±0.35) nm, Zeta potential of(-17.8±0.306) mV, permeability of(1.67±1.01)%, and stable property if liposome was stored at 4 ℃. 24 h after percutaneous administration, the cumulative osmotic capacity per unit time was(30.485 2±1.238 9),(34.794 8±0.928 3),(26.677 1±1.171 7),(3.066 2±0.175 3) μg·cm~(-2)respectively for methyleugenol, elemin, β-asarone and α-asarone. In vitro transdermal behaviors of methyleugenol, elemin, β-asarone and α-asarone in liposomes were all consistent with Higuchi equation. The prepared volatile oil liposomes met the relevant quality requirements, providing a reference for further research on preparation of multi-component Chinese medicine essential oil liposomes.

Power spectrum density transmissibility (PSDT) functions have attracted widespread attention in operational modal analysis (OMA) because of their robustness to excitations. However, the selection of the peaks and stability axes are still subjective and requires further investigation. To this end, this study took advantage of PSDT functions and support-vector machines (SVMs) to propose a two-stage automated modal identification method. In the first stage, the automated identification of peaks is achieved by introducing the peak slope (PS) as a critical index and determining its threshold using the SVM classifier. In the second stage, the automated identification of the stability axis is achieved by introducing the relative difference coefficients (RDCs) of the modal parameters as indicators and determining their thresholds using the SVM classifier. To verify its feasibility and accuracy, the proposed method was applied to an ASCE-benchmark structure in the laboratory and in a high-rise building installed with a structural health monitoring system (SHMS). The results showed that the automated identification method could effectively eliminate spurious modes and accurately identify the closely spaced modes. The proposed method can be automatically applied without manual intervention, and it is robust to noise. It is promising for application to the real-time condition evaluation of civil structures installed with SHMSs.

Limited studies focused on the slope rock foundation, and the application results of several methods differ considerably. In this paper, the coefficients of the Bell solution are first reduced by the length ratio of the sliding failure plane and the vertical area ratio of the overloaded soil. Then, the Hoek–Brown criterion for nonlinear failure is introduced, and the tangential line tangent to the Hoek–Brown failure criterion curve is calculated to replace the original M-C failure criterion. A method for determining the instantaneous friction angle and instantaneous cohesion under normal stress with the Bell solution failure mode is established, and the relationship between the instantaneous friction angle, instantaneous cohesion, and normal stress are discussed. The instantaneous friction angle decreases with the increase in normal stress, whereas the instantaneous cohesion increases with normal stress. The influence of geological strength index (GSI) and rock empirical parameter mi on bearing capacity coefficients N σ, N q, and Nγ are also comprehensively analyzed. The coefficients increase with GSI and mi . In addition, the method is used to analyze the bearing capacity of rock foundation of a high and steep slope in an open-pit mine, and the results are compared with the slip-line method, which considers Hoek–Brown failure criterion and finite-element numerical simulation. The comparison demonstrates the acceptability of the proposed method.

The determination and analysis of the bearing capacity of a slope foundation has become an important research topic in foundation design theory. To explore the ultimate bearing capacity of the rock foundation adjacent to a slope on the basis of the shear failure mode of a rock foundation on a semi-infinite plane, the failure mode of the rock foundation near the slope was established by analyzing the failure mechanism of the Bell solution. The upper limit theorem of limit analysis was used to build a velocity field allowable for maneuvering. Using this method, the ultimate bearing capacity of the Sandaozhuang open-pit mine was analyzed and calculated. The results show that the foundation load of the mine is less than the allowable bearing capacity; hence, the building on the slope meets the requirements of foundation bearing capacity. At the same time, this paper uses this method and existing research methods to compare and analyze this project with others, proving the rationality and feasibility of the proposed method. This paper further explores factors affecting the ultimate bearing capacity, such as the horizontal setback distance of the footing from the edge of the slope and the dip angle. It is concluded that the ultimate bearing capacity increases with increases in the distance to the slope and decreases in slope angle. The study also shows that the calculations developed and proposed in this paper for the bearing capacity of the rock foundation adjacent to the slope are reasonable and feasible, can be applied to the calculations of the bearing capacity of rock foundations near the slope, and have guiding significance for the project.

In this paper, we consider we consider the regularity problem for the weak solutions to the Navier-Stokes equations with damping term in 3 . We establish a regularity criterion in terms of the derivative of the velocity in one direction for this problem in BMO space.

Crystal Eco-brick is a new ecological generality of decoration material. The shell is a key component of indoor stereo virescence concept combined with interior decoration materials. After crystal Eco-brick shell design had been finished, related technology research as well as development for the first, the second and third generations productions were done. The third generation of Crystal Eco-brick shell reached excellent characters such as strong universality, simple operation, high strength, more suitable for indoor afforestation.

In this paper, the FEM software ABAQUS is used to analysis the pile-soil load share ratios, load share value of pile side friction and tip resistance for three bases, including natural raft foundation, conventional piled raft foundation and two-phase varying stiffness piled raft foundation. Furthermore, the deformation and settlement of deformation-coordinating device are studied as well. Based on the research of the working characteristic of piles and soil, it highlights the good working mechanism of two-phase varying stiffness piled raft foundation. The analysis results show that two-phase varying stiffness piled raft foundation, with obvious two phase stress characteristics, has a working principle between natural raft foundation and conventional piled raft foundation, fully making use of the bearing capacity of foundation soil, effectively improving the joint bearing capacity of piles and soil.

In this paper, three-dimensional wind-induced vibration control is investigated by using multiple tuned mass dampers (MTMD). A 20-story steel frame is take as a numerical example to compare the two control effects by using MTMD and TMD (tuned mass damper), in which the same control masses are set on the top floor respectively. The parameters and locations of the damper devices could be chosen optimally based on energy balance theory and genetic algorithm. Numerical results show that the total damp value and the total structural dissipative energy of MTMD is lower than TMD while the total mass are the same. Meanwhile, MTMD also shows a better performance on reducing the along wind displacement and torsion response of the structure than that of TMD.

On the basis of a 5 m plate mill, a 3D rigid-plastic finite element (FE) model was developed to investigate changes of plate plan view patterns during hot rolling process. By analyzing the simulation results of conventional rolling processes, it was found that the plate plan view pattern was closely related to broadside rolling ratio. Then, the prediction models for plate plan view patterns were formulated by nonlinear regressive analysis of the simulation results and modified for high accuracy. Based on these models, the broadside compensation rolling method performing at the last pass of broadside rolling phase was designed to decrease plate end crops. Comparing the plate plan view patterns with and without broadside compensation rolling, reduced plate end crops indicate that the broadside compensation rolling model is effective for plate plan view pattern control.

Credit risk evaluation is important for e-commerce platforms, due to the uncertainty and transaction risk associated with buyers and sellers. Moreover, it is the key ingredient for the development of the e-commerce ecosystem and sustainability of the financial market. The main objective of this paper is to develop an effective and user-friendly system for seller credit risk evaluation. Three hybrid artificial intelligent models, including (1) decision tree&mdash, artificial neural network (ANN), (2) decision tree&mdash, logistic regression, and (3) decision tree&mdash, dynamic Bayesian network have been investigated. The models were trained using sellers credit cases from Taobao, which has 609 cases, and each case had 23 categorical and numerical attributes. The results suggest that the combination of decision tree&mdash, ANN provides the highest accuracy, which can promote healthy and fast transactions between buyers and sellers on the platforms. This model is regarded as a powerful tool that allows us to build an advanced credit risk evaluation system, and meet the requirements of the platform transaction mode to be dynamic and self-learning&mdash, which will ultimately contribute to the sustainable development of the e-commerce ecosystem. The empirical results can serve as a reference for e-commerce platforms promoting an optimum credit risk evaluation model to improve e-commerce transaction environment and for buyers and investors making decisions.

The Nanting River runs through China and Myanmar, which has been planned to be renovated as the urban river of Mengding City, Yunnan. In order to make the river regulation works more efficient, different river discharges are tested in the 1-D and 2-D numerical models to investigate the variation of river hydrology and local flow field profiles before and after the construction works. The results are used to validate the feasibility of designed river parameters (including the width and the depth) and assess the correlation impacts. It proves that: 1) The Nanting River is a typical southern mountain river, of which the discharge has a great difference between rainy and dry seasons. The waterscape and flood control capability of different discharges should be considered for both ecological environment and flood control safety. 2) 1-D model is benchmarked against the on-site measurement data. The results indicate that 1-D model has the capability to simulate the hydrological characteristics before and after the regulation works and represent the influence of upstream and downstream flow. The results can be used as the boundary conditions in the 2-D model. 3) The simulations of the local flow field with different flow discharges are carried out by a 2-D numerical model. Those results are used for the assessments of the project layout and the revetment protection. 4) During the implementation of the regulation works, this project experienced the extreme flood which was close to the defense limit. Moreover, an earthquake and several floods hit this region. The structures survived and maintained in good condition in the hazards which proves that this regulation project is successful and necessary and the research method is valid and efficient.

Cu/Nb bilayer was utilized to join Ti-6Al-4V titanium alloy and AISI 316L stainless steel by electron-beam welding. Effects of electron-beam offsetting on microstructure and mechanical properties were studied. Microstructural characterization was carried out through optical microscopy, scanning electron microscopy with energy dispersive spectroscopy and x-ray diffraction. Results showed that dual-pass welding is better to achieve higher-quality joints than single-pass welding. When adopting dual-pass welding, the closer distance of first pass beam was to Nb layer side, the less contents of Fe and Cr were in the weld zone, and the phases changed from NbFe + NbFe2 + Cr1−xFex + NbCr2 + Cu based solid solution, NbFe + Cu3Ti + Cu based solid solution + Nb based solid solution to NbFe + Cu based solid solution + Nb based solid solution in weld zone. Owing to the formation of Cu-Fe and Nb-Ti solid solutions, the hardness of the weld zone was increased within 400 HV. Maximum average tensile strength of welded joints was 148.8 MPa, and fracture morphology changed from brittle mode to mixed fracture modes by adjusting first pass electron beam closer to the Nb side. Evolution of interfacial microstructure, formation and fracture mechanisms of the joints were summarized.

In this paper, based on the finite element (FE) software Deform 3D, the simulation of the die forging process of a high pressure valve body was conducted. The deformation field and the metal flow field of billet were obtained and analyzed in detail. In addition, the effect of upsetting depth on the die forging process of high pressure valve body was also discussed. This study can provide a good guide for the following researches and practical industry.

Based on 76-storey Benchmark model, the optimization objective including displacement reduction index and acceleration reduction index is given under the effect of wind-induced vibration, by which kinds of dampers are optimally designed based on Genetic Algorithm. The optimization results show that the peak acceleration, peak displacement and peak storey drift of structure are remarkably reduced and kinetic energy and deformation energy are reduced significantly. It means optimized dampers have achieved good effect on wind-induced vibration control of the structure.

The Spring Festival is the most important festival in China. How can passengers go home smoothly and quickly during the Spring Festival travel rush, especially when emergencies of terrible winter weather happen? By modifying the social force model, we simulated the pedestrian flow in a station hall. The simulation revealed casualties happened when passengers escaped from panic induced by crowd turbulence. The results suggest that passenger numbers, ticket checking patterns, baggage volumes, and anxiety can affect the speed of passing through the waiting corridor. Our approach is meaningful in understanding the feature of a crowd moving and can be served to reproduce mass events. Therefore, it not only develops a realistic modeling of pedestrian flow but also is important for a better preparation of emergency management.

Background In recent years, significant growth has been observed in the field of plastic and reconstructive surgery. However, the national productivity to the field of plastic and reconstructive surgery remains unknown. We therefore intended to reveal national contributions in the field of plastic and reconstructive surgery. Methods Articles published in the 6 highly cited journals in plastic and reconstructive surgery in 2005-2009 were retrieved from the Medline and Web of Science. The number of total articles, the per capita numbers, 5-year impact factors (5y-IF), and citations were tabulated to assess the contribution of different countries. Results A total number of 5745 articles were published in the 6 journals from 2005 to 2009 worldwide. North America, West Europe, and East Asia were the most productive regions. High-income countries published 79.72% of the total articles. United States (USA) published most of the articles during 2005 to 2009 (2015/5745, 35.07%), followed by United Kingdom, Turkey, Japan, and China. Besides, USA also had the highest total 5y-IF (5010.76), the highest mean 5y-IF (2.49), and the highest total citations (11,788). When normalized to population size, Sweden had the highest number of articles per million persons (12.26), followed by Switzerland (8.02) and Netherlands (7.77). Conclusions USA is the most productive country in the field of plastic and reconstructive surgery. When normalized to population size, some European countries might be more productive.

In this paper, the multi-stage die forging process of a high pressure valve bonnet was simulated by 3D coupled thermal-mechanical rigid-viscoplastic finite element (FE) method. The deformation and the metal flow field of billet were obtained. Based on the simulation, two optimized schemes were put forward for improving the yield. Both of them can save material and ensure the stability of billet during the forging process. The study can provide scientific theory foundation for practical engineering applications.

The Falling Weight Deflectometer (FWD) is designed to impart a load pulse to the pavement surface which simulates the load produced by a rolling vehicle wheel, wildly used in back-calculating pavement structure modulus. In this paper, a new form of Genetic Algorithm based on database searching theory is introduced. This method is not sensitive to initial values and it could identify the modulus effectively with establishing simple databases. By using a project measured data as an example, the result shows that this method is stable, convergent and practical. This method is better than the traditional method. It will be one of useful tools for the highway assessment.

In this paper, a 20-storey Benchmark model is used to compare the effects of various control systems, including Damper control system, TMD control system and Hybrid control system. In the course of the optimization, the displacement reducing coefficient (DRF) and the storey drift reducing coefficient (SDRF) are used as the objective functions to optimize the control parameters based on Genetic Algorithm (GA). Numerical results prove the advisability of the Hybrid control system of dampers and TMD, which can not only decrease the floor displacement, but also improve the mutation of the storey drift.

A microcontroller AT89C55 was used as the detection and control core of the electric car passing seesaw in the design. Reflective photoelectric switch LTH1550 -01 constitute the patrol line module to guide the car driving; High - performance magnetic sensitive precision small-angle tilt sensor WQH36 -45 was used to detect the state of equilibrium of the electric car; Bridge driver L298 was used to control reversing/forwarding rotation and PWM motor speed control; 12 - bit switched capacitor successive approximation ADC TLC2543 was used to sample electric car’s sensor signal; keyboard and LED display composed of I2C interface keyboard and LED driver ZLG7290 achieve the human-machine interface; voice playback was compose of the single-chip voice chip ISD2590 and small power amplifier LM386. Based on the above complete and reliable hardware circuit design , the use of sophisticated software algorithms to achieve the angle offset feedback loop speed control and self - correction , the exact line inspection guide , making the electric car in various stages can be accurately controlled .

AD7715 is a high accuracy A/D converts chip made by American company Analog – Devices which involves a programmable gain amplifier, a programmable digital filter. It employs the Σ-Δ ADC technology to realize the 16-bits accurate measurement. The voltage meter uses 89C55 SCM as control, uses analog switch to conduct multi switch for measured voltage through signal conditioning, uses new 16-bit A/D convert to sample measured voltage being conditioned, uses 128 X 64 dot-matrix LCD as display screen to show the wave and Chinese words. This article mainly introduces the means of applying AD7715 chips to design accurate voltage meter.

In the past decade, plastic and reconstructive surgery in China has achieved great advances. However, the scientific publications in plastic and reconstructive surgery in the major regions of China-Mainland, Hong Kong, and Taiwan are unknown. We therefore intended to reveal the contribution of articles from Chinese authors to the field of plastic and reconstructive surgery.Articles published in the 6 journals in plastic and reconstructive surgery originating from Mainland China, Hong Kong, and Taiwan in 2000 to 2009 were retrieved from the PubMed database and Journal Citation Reports. The number of total articles, 5-year impact factors (5 years-IF), and citations were tabulated to assess both the quantity and quality of research arising from China.From 2000 to 2009, there were 568 articles from China, including 225 from Mainland China, 317 from Taiwan, and 26 from Hong Kong. The annual total numbers of articles from the 3 Chinese regions increased gradually between 2000 and 2009 (from 40 to 100). From 2007, the number of articles published from Mainland China exceeded Taiwan. Taiwan had the highest accumulated 5 years-IFs, average 5 years-IF, total citations, and average citations of each article. Plastic and Reconstructive Surgery was the most popular journal in China.The number of articles published from Chinese authors increased markedly from 2000 to 2009, particularly from Mainland China, since 2004.

Hot deformation behavior and microstructure evolution of hot isostatically pressed FGH96 P/M superalloy were studied using isothermal compression tests. The tests were performed on a Gleeble-1500 simulator in a temperature range of 1000—1150°C and strain rate of 0.001–1.0 s −1 , respectively. By regression analysis of the stress-strain data, the constitutive equation for FGH96 superalloy was developed in the form of hyperbolic sine function with hot activation energy of 693.21 kJ/mol. By investigating the deformation microstructure, it is found that partial and full dynamical recrystallization occurs in specimens deformed below and above 1100°C, respectively, and dynamical recrystallization (DRX) happens more readily with decreasing strain rate and increasing deformation temperature. Finally, equations representing the kinetics of DRX and grain size evolution were established.

To present our experience of vaginal reconstruction with the use of a pedicled ileum segment and laparoscope assistance, and to analyze its complications and long-term anatomic and functional results.The abdominal and perineal approaches were performed simultaneously with the patient in a special position. Under the guidance of laparoscopy, the target ileal segment was harvested and transposed down to the perineum through an artificial tunnel between the bladder and the rectum. A silicon vaginal tutor was introduced into the vaginal cavity and maintained all day long for 2-3 months. The complications and the anatomical and functional results were summarized and analyzed.From February 2002 to June 2010, 82 patients underwent laparoscope-assisted total vaginal reconstruction with a pedicled ileum segment at our department. Complications developed in 16 of 82 patients, including rectum and/or bladder injury during operation, acute renal failure, delayed healing of the ileocutaneous anastomosis, introital stenosis, and partial or complete intestinal obstruction. The abdominal cutaneous scar was acceptable after the surgery. The vulva was not altered, which was especially significant for patients with congenital vaginal atresia. The neovagina was patent, soft, moist, and flexible. The mean width and depth of the neovagina at the latest postoperative visit measured 3.2 and 15 cm, respectively.The favorable long-term anatomical and functional results demonstrate that our technique is ideal for patients with congenital vaginal atresia or patients who need secondary vaginal reconstruction. For the primary male-to-female transsexuals or hermaphrodites, it can be an alternative method for vaginal construction.

Many new control techniques and energy dissipation systems which can decrease the response of wind vibration and earthquake. But there is less research on the mixed control system of Damper and TMD. In order to improve the shortcomings of Damper system and TMD system, combining their respective advantages reasonably, the mixed control system of Damper and TMD were analyzed in this paper. A 20-storey Benchmark model was used to compare the effects of various control systems under 2-directional earthquake. Taking the displacement reducing coefficient (DRF) as the objective function, Damper system, TMD system, and the mixed control system of Damper and TMD are optimally designed based on Genetic Algorithm (GA). Numerical results show that the mixed control system of dampers and TMD proposed in the paper can work in coordination and complement each other to achieve better control effect.

The novel passive energy dissipation system named Damped Outrigger System for frame-core tube structure is introduced in recent years, in which the outrigger and perimeter columns are separate, and the vertically acting fluid-viscous dampers connect the end of each of the outrigger walls to the adjacent perimeter column. In this paper, a new simplified model of this structure is studied by considering the damping force and shear stiffness of the core tube and lateral stiffness of the frame with finite element method. The shear correction factor is also employed to consider the shape of the core tube cross section. The numerical example shows that the displacement and the inter-story drift of the structure are reduced effectively under earthquake loads. It means that the damped outrigger is an innovative solution to resisting earthquake loads for frame-core tube structure.

In this paper, based on finite element (FE) software MSC.Marc, a multi-field coupled FE model is established to investigate the 18-pass hot rolling process of GCr15 steel rod. Thermal, mechanical and microstructural phenomena during the rolling process are coupled in the model. In this model, the microstructure evolution of GCr15 Steel is described by some empirical equations which are obtained using the Gleeble-3800 thermomechanical simulator, and a MSC.Marc subprogram is designed to predict the evolution of recrystallization behavior and austenite grain size. With the aid of the model, the paper analyzes detailedly the distribution and evolution of microscopic field-variables in rolled piece during the whole rolling process of GCr15 steel rod. Predicted values of grain size show good agreement with measured ones. The current model is beneficial to understand the effect of recrystallization behavior and control the microstructure evolution during hot rod rolling process.

Cloud computing, with exciting market prospects, has a number of potential risks and safety issues to the cloud services users. After an objective analysis of the security challenge and problem, in current cloud computing development, the latest research progress in the field of cloud security were summarized. Finally, the important research directions in the field were pointed out. It’s will be a new trend for the cloud computing and trusted computing technology to integrate..