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In order to improve the accuracy and efficiency of engineering quantity calculation, this study is based on BIM technology and takes concrete engineering as the research object. Through three-dimensional computational analysis method, comprehensive quantification and visualization of concrete engineering are achieved, improving the accuracy and controllability of the construction process. Firstly, the advantages of BIM based 3D computing were introduced. Subsequently, BIM based structural seismic analysis was proposed, and the structural analysis model based on Revit software was formed simultaneously with the creation of the structural geometric model. While creating the geometric model, the analytical model automatically connects at the nodes. The process of creating a geometric model is carried out in the order of layer by layer construction from low to high in the actual construction project. On the basis of the Revit model, a magician developed by Shanghai Bicheng was used to cut the components, and then the IS BIMQS plugin was used to attach the calculation rules to the list, directly extracting the engineering quantity from the model. Through comparative analysis, it is found that different methods of calculating engineering quantities have their own advantages and disadvantages. Choosing the appropriate output method and calculation tools can efficiently utilize the BIM model information during the design phase and accurately calculate engineering quantities.This study demonstrates the superiority of three-dimensional computational analysis of concrete engineering based on BIM technology, which not only improves the accuracy and consistency of engineering quantity, but also achieves significant advantages in project management and decision-making. This provides empirical research support for promoting BIM technology in the field of concrete engineering in the future, and provides useful experience and reference for the digital transformation of construction engineering.

This review focuses on how short X-ray pulses from synchrotrons and XFELs can be used to track light-induced structural changes in molecular complexes and proteins via the pump–probe method. The upgrade of the European Synchrotron Radiation Facility to a diffraction-limited storage ring, based on the seven-bend achromat lattice, and how it might boost future pump–probe experiments are described. We discuss some of the first X-ray experiments to achieve 100 ps time resolution, including the dissociation and in-cage recombination of diatomic molecules, as probed by wide-angle X-ray scattering, and the 3D filming of ligand transport in myoglobin, as probed by Laue diffraction. Finally, the use of femtosecond XFEL pulses to investigate primary chemical reactions, bond breakage and bond formation, isomerisation and electron transfer are discussed.

In this paper, combined with the actual engineering, a modular transportation status monitoring system is designed, which can be used to measure environmental conditions such as vibration, inclination, temperature and humidity during the process of transportation. The system consists of a main control module, a storage module, a data acquisition module, a real-time clock module, a power management module and an alarm module. The design scheme has high development efficiency and strong practicability. The measurement device used in the experiment for environmental monitoring during transportation process performs well, and can be a typical application case of innovative practice teaching

Combined with the actual project, a grating ruler accelerated life test device is designed, which can simulate the actual loads, including temperature, humidity and speed stress. An accelerated life test scheme based on stepped stress loading is proposed, and 6 grating rulers are tested based on time-censored test method. An accelerated life model based on Weibull distribution used for evaluating the lifetime is established. Related experimental techniques also can be typical application cases for innovative practical teaching.

Nowadays, high-order data needs to be processed quickly and accurately by various algorithms in distribution networks. It is difficult to ensure the accuracy of calculation both in low-order and high-order cases, due to the theoretical limitations of traditional high-order derivation methods. Aimed to improve the calculation accuracy, a new high-order derivative method based on the polynomial fitting is proposed in this paper. By analyzing the transient characteristics of voltage and current signals in the distribution network, the base fitting-function can be selected, and the coefficient of the base function can be obtained to fit the objective function by the least square method. The original discrete data will be replaced by new fitting-function for derivative operation, which not only ensures the anti-interference ability, but also overcomes the limitations of the traditional polynomial fitting method in high-order cases. The simulation results show that this method has high accuracy in high-order and low-order cases, and has good accuracy and anti-interference ability.

Online reviews have become the main method of information dissemination, an important factor in consumer purchase decisions, and an important basis for merchants to improve their services. It has attracted the attention of scholars. The application of explanation level theory in consumer behavior research has begun to show an increasing trend. After sorting out the existing literature, it is found that the online review literature based on the interpretation level theory mainly studies the impact on consumers’ purchase intention from the three perspectives of reviewers, review content and review readers. Among them, the content of comments is mostly discussed in terms of comment type and information quality, but it has not been systematically summarized. Using the literature review method, based on the interpretation level theory, the review type, information quality, interpretation type and perceived similarity are analyzed from the perspective of review content, and the existing literature is sorted in order to provide references for future research.

Bongkrekic acid (BA) is a colorless and tasteless toxic. It exists in some fermented food and can be easily taken in by accident. Currently, no proper treatment has not been developed to treat this toxin in human body, therefore the death rate is very high. Mechanism of BA has been well studied these years and found that BA inhibit ATP synthesis, which lead to severe clinical symptoms, such as limb soreness, weakness and liver damage. In this paper, we mainly focus on the mechanism of BA in our human body, its related cases and the inhibition of BA in the food. This review can provide basic information for the future development of the treatment of BA in human body.

This work aims to explore the impact of a proposed lower limb exoskeleton robot on the muscle strength of the tibialis anterior muscle in stroke patients. Firstly, 24 patients with stroke hemiplegia were divided into the robot group and the control group according to a random number table. Both groups received conventional rehabilitation treatments. Moreover, the robot group took the walking training with UG0210, a lower limb exoskeleton walking rehabilitation device developed by the Hangzhou RoboCT Technology Development Co., Ltd., once per day, 30 minutes per time, a total of 20 times of treatment. The control group took the conventional rehabilitation walking training, once per day, 30 mins per time, a total of 20 times of treatment. At the beginning of the trial, the manual muscle strength test (MMT) was used to assess the pre-trial muscle strength within the trial cycle. The efficacy of the two groups was compared. Results The muscle strength of the tibialis anterior muscle was higher than that without treatments in both groups (P

A hybrid genetic algorithm and vector fitting based approach is proposed for the approximation of the propagation function of transmission lines. In this work, the process of guessing the number of poles and then adjusting corresponding delay times in the conventional method is improved by the genetic algorithm. The proposed approach can result in a better approximation of propagation function, which is proven by a successful implementation to an overhead single core coaxial cable.

The key to the criticism of fair value lies in the lack of measurement in the active market quotation, while the fair value hierarchy hopes to make up for the reliability of fair value information by increasing disclosure. Using listed commercial bank data from 2007 through 2016, this paper documents that the assets and liabilities measured by fair value are significantly positively associated with audit fees. The positive association between audit fees and the fair value obtained via Level 2 or Level 3 inputs is greater than that Level 1.These results indicate that when the fair value needs to be estimated, the auditor needs to increase audit effort with resulting in higher audit fees. Moreover, the balance of assets and liabilities that fair-valued using Level 2 inputs is the largest and accounts for the highest proportion, which leads to more substantial changes in audit expenses. This result is consistent with the scale determinism of audit expenses. At the same time, due to the impact of professional judgment on the fair value hierarchy and the absence of corresponding supervision, the management has the motivation to use hierarchy for earnings management. The assets and liabilities that fair-valued using Level 2 inputs may represent the characteristics of fair value earnings management, audit risk is higher.

To explore the intervention effect of exoskeleton robot training on anxiety of stroke patients. Methods 24 stroke patients with hemiplegia were randomly divided into experimental group and control group, with 12 cases in each group. Moreover, the robot group took the walking training with UGO 210, a lower limb exoskeleton walking rehabilitation, once per day, 30 minutes per time, a total of 20 times of treatment. Before the trial and at the end of the trial cycle, patients’ emotions were assessed using the Self-rating Anxiety scale (SAS), and the efficacy of the two groups was compared. Results: The scores of anxiety scale decreased in both groups (P

In this paper, the bottom frame beam of container building is analyzed by finite element method, and compared with the experimental results, the accuracy of the model is verified to meet the needs of the analysis. On this basis, by changing the stiffening position of the upper flange, the height of the web, the load layout and the thickness of the wall, the variation of the stability bearing capacity of the bottom frame beam was studied, the control factors affecting the stability bearing capacity of the bottom frame beam were obtained, and the selection suggestions were given.

Edge detection is often performed on disc-like object in Cassini astronomy images to accurately obtain the object’s center position. The existing edge extraction methods usually produce lots of false edge pixels because of noise and the interior details in disc-like objects. In the paper, an edge detection algorithm based on Extreme Learning Machine (ELM) is proposed for Cassini astronomy images. In the ELM model, a 28-D feature vector of a pixel in Cassini image is constructed as input, which consists of first and second derivatives and some Haar-like features, and a binary classifier is obtained as output that tells if the pixel is in edge. The experimental result shows that its performance is much better than traditional operators. The detected edge is closer to the actual contour. Its average accuracy is 0.9379. The algorithm can be applied to edge detection of disc-like objects in astronomy images.

The scraper angle of milling machine has a direct effect on the milling efficiency. This research establishes the finite element model of scraper, and designs the cutting front angle and the cutting back angle as factor, impact force and the average force for orthogonal test of evaluation indexes. Through simulation analysis, the force is obtained at the different level. At the same time, the simulation results are verified by experiments. The results show that the simulation results of contact force in the X direction are close to the measured results, and prove the accuracy of the simulation results. The optimized scraper is that the cutting angle is 5.5°, and the cutting back angle is 9°. The impact force is minimum, and the resultant of average force and impact force is minimum. The optimization of scraper angle can effectively reduce the impact force and the average force, which provides guidance for the improvement of scraper.

At present, the spacecraft thermal test temperature measurement system has not been designed effectively. In the spacecraft experiment, the defects of anti-interference ability and system instability are exposed. Firstly, the composition and status of the temperature measurement system of spacecraft thermal test are analyzed. And then we set up a system to interfere with fault tree according to existing problems, locate the problem and determine the source of the interference. Finally, the anti-interference scheme and implementation are developed, and the test data of anti-interference test system is set up. The anti - jamming performance of the anti - jamming scheme of thermal test temperature acquisition system was evaluated. The results show that it can improve the anti-jamming capability of the spacecraft thermal test temperature acquisition system and improve the stability of the system.

The effects of the composite coagulants on coagulation sedimentation for the preserved wastewater was investigated by changing the composite coagulant dosages, and the coagulant was composed of polymeric ferric sulfate (PFS), polyaluminium chloride (PAC), and polyaluminum ferric silicate (PAFSC), while the effect of the tertiary treatment process on the preserved wastewater was tested, which was exceeded the standard seriously. The results showed that 400 mg/L was the optimum composite coagulant dosage. The removal rates of salt and sugar were as high as 99.1% and 99.5% respectively, and the removal rates of CODCr and SS were 99.3% and 96.0%, respectively after the preserved wastewater was treated by the tertiary treatment technology, which both reached the primary standard of “The Integrated Wastewater Discharge Standard” (GB8978-1996).

The preserved wastewater was treated by the upflow anaerobic sludge blanket (UASB) reactor, the effects of the anaerobic time on COD, turbidity, pH, conductivity, SS, absorbance, and decolorization rate of the preserved wastewater were investigated. The results showed that with the increase of the anaerobic time, the treatment effect of the UASB reactor on the preserved wastewater was improved. Under the optimum anaerobic time condition, the COD removal rate, turbidity removal rate, pH, conductivity, SS removal rate, absorbance, and decoloration rate of the wastewater were 49.6%, 38.5%, 5.68, 0.518×104, 24%, 0.598, and 32.4%, respectively. Therefore, the UASB reactor can be used as a pretreatment for the preserved wastewater, in order to reduce the difficulty of subsequent aerobic treatment.

The conch ceramics bodies with different ratios were prepared by compression moulding technology using shell, kaolin, and calcium oxide etc. as the raw materials, and then calcined at the high temperature to obtain the conch ceramics. The effects of raw material ratios and calcination temperatures on the performance of conch ceramics were investigated by rotational viscometer, vernier caliper, digital display whiteness meter, thermal analyzer, and Fourier transform infrared spectrometer(FT-IR). The results indicated that the viscosity, line shrinkage rate, and whiteness of the conch ceramics were 1.29 Pa·s, 17.9%, and 54.1%, respectively, when the content of the shell powder was 20 wt% and kaolin was 65 wt%. The density of the conch ceramics was the largest (3.8 g/cm3) when calcination temperature was 1200 °C. The results of FT-IR spectrum showed that the addition of the shell powders changed the structure of the ceramic body, which improved the performance of the conch ceramics.

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