Method For Rapid Construction Research Articles

Side shear strength and load-transfer mechanism of corrugated steel column–foundation socket connection

Accelerated bridge construction has received widespread attention globally owing to its cost-effectiveness. The integrity of the connections between precast bridge piers and other members of the structure is crucial for developing assembly substructures. This issue was examined in the present study. A novel corrugated steel tube socket connection (CSSC) was developed for column–foundation connections. The CSSC method is a rapid bridge construction method in which a prefabricated corrugated steel tubular concrete column and a corrugated steel pipe in the foundation are connected using concrete or ultra-high-performance concrete. A vertical monotonic static load experiment was performed on six CSSC specimens and one cast-in-place (CIP) specimen to investigate the slip performance, failure modes, and load-transfer mechanism. The side shear performances was compared among specimens with different parameters (connection method, embedment depth, presence of studs, and presence of concrete under the columns). The experimental results indicated that the CSSC specimens had better ductility values and higher axial bearing capacities than the CIP specimen. Increasing the embedment depth, adding studs, and adding concrete under the columns increased the ultimate bearing capacity. To accurately estimate the side shear performance of the CSSC, a reliable finite-element model was developed. An additional parametric analysis was performed to investigate the effects of different parameters on the vertical performance. The CSSC is effective connection type in the prefabricated column-foundation connection and is suitable for bridge high-gravity superstructures. Finally, design recommendations regarding the construction details of the CSSC were presented.

Urban storm flood simulation using improved SWMM based on K‐means clustering of parameter samples

AbstractTo address the two problems of unclear delineation of sub‐catchment and complicated and cumbersome parameter rate determination in the Storm Water Management Model (SWMM), this study proposes a rapid construction method of SWMM based on the principle of single urban functional area combined with K‐means clustering algorithm, The research area is the southern part of Jinshui District, Zhengzhou City. The Hydrological Response Unit (HRU) contains only a single urban functional area, divided by combining the natural and social attributes of the urban surface. Calibrated uncertain parameters from 76 papers were selected as samples, and the K‐means clustering algorithm was used to cluster and calculate the parameter values, to improve the SWMM model, selecting three typical rainfall runoff processes for validation application. The results show that simulated runoff is consistent with measured runoff trends, with the NSE and R2 value scores of the flow processes of the three floods above 0.86 and the, locations and numbers of flooded nodes are consistent with the actual research. This provides a new idea and technical support for the construction of urban flood models in flood prevention and mitigation. The relevant results can provide scientific decision‐making reference for urban flood forecasting and warning.

Metal‐Free Rapid Diastereoselective Construction of Isocryptolepine Core via Elecrophilic Dearomatization ‐ Inramolecular Michael Addition Sequence

AbstractA method for rapid construction of indolo[3,2‐l]acridin‐7‐one systems bearing isocryptolepine scaffold is described. Metal‐free condensation of (4‐methoxyphenyl)cyclohexan carbinols with ortho‐amino/hydroxybenzonitriles in concentrated sulfuric acid yields polyannulated compounds with four new stereogenic centers in a highly diastereoselective manner. The reaction includes elecrophilic dearomatization of methoxyarene, formation of spirocyclic intermediate and intramolecular 1,4‐nucleophilic addition sequence.

Rapid construction method of equipment model for discrete manufacturing digital twin workshop system

A large-scale manufacturing workshop includes a wide variety and a large amount of equipment. When equipment is mapped as a digital twin (DT) model, the DT model has complex and implicit or non-hierarchical relationships, which makes the development of a DT workshop system (DTWS) for a manufacturing plant challenging. To address this problem, this paper proposes a rapid construction method of equipment model (RCMEM) for a discrete manufacturing DT workshop system, which can meet the requirements of complex manufacturing business scenarios, improve the efficiency and quality of the DT model construction at the equipment level, and form an efficient equipment model construction method. First, a DT object (DTO), which represents a basic unit of the DT model, is defined. The DTO is used to derive the DT model at the equipment level. The DTO collects and wraps generalization-capable functions from equipment into components, and geometric, functional, and communicative descriptions are combined into a single model. The DT model can increase the scalability, reusability, and modeling quality by reusing the DTO capabilities. Further, a general construction process of the DTO model of multi-axis computer numerical control (CNC) machines is presented. This process standardizes the common capabilities of the equipment models and minimizes the construction time of machines’ DT models. Furthermore, a rapid mounting and communication configuration mechanism (RMCCM) is proposed. This mechanism enables fast DTO network communication and improves interoperability in a multi-source data environment. This paper also proposes a DTWorks Software development kit, which can help developers to build digital factory standalone applications. The RCMEM is implemented into the DTWorks. Finally, a real DTWS case is used to examine the differences in equipment model building before and after the application of the RCMEM. The results demonstrate the good effectiveness of the RCMEM in complex business settings.

Container House using GFRG Panels

In India the demand for housing is ever increasing and hence there is an increase in demand for building materials. Providing affordable housing is a challenge for developing country like India. India have an shortage of millions houses. Now days, more than 17 million retired shipping containers are stacked on the port worldwide. Container building still facing the various challenges. To avoid this challenges GFRG panels use as a Walls and Roofs of container house. So, Container house using GFRG panels provide an adequate solutions to the various problems. Building materials which are energy efficient strong and durable at an affordable cost are in great demand GFRG panels are of much relevance in India where there is tremendous need for cost effective mass scale and rapid housing. They are not only eco-friendly, but also resistant to termites, heat, rot, corrosion, water and fire. Concrete infill with vertical reinforcement rods enhances its vertical and lateral load capabilities. Comparative studies of GFRG and conventional buildings have been carried out in the present investigation. Rapid wall panel provides speedier construction and leads to environmental protection. Subsequently, it is a perfect option building material to replace bricks or concrete blocks. GFRG wall is a green product which can erect a building fast in prefabricated method. This paper highlights the positive aspects of GFRG panels with respect to Time, cost of construction Strength, affordability, energy efficiency over the conventional construction materials and its suitability in the Indian Housing Scenario. This research aims in providing adequate shelter for all individuals that is one among the recent challenges long faced by the developing countries. Economical plan and development of structures, utilizing green material is an option in contrast to exhaustion of totals and increment in cost of concrete. Glass fiber reinforced gypsum panel (GFRG) is a green material, which is a rapid wall construction method and a cost effective construction process. With the end goal to enhance the productivity, and decrease of waste, the lean the development has been presented as another administration rule for better execution. In India, the usage of lean administration in the development industry is a noteworthy errand. Because of the absence of consideration and uneducated towards the lean administration guideline the proprietor, contractual worker, engineers and so on are as yet creating a stage to actualize this standard in their task. This venture primarily centers on to recognize the potential outcomes of execution of lean administration in the development industry. This paper shows the probabilities of compelling usage of lean administration guideline in the development industry, which can definitely diminish the use of time, increment the nature of work, and benefit rate by wiping out the wastage of materials. It finally, points in giving lodging to all classes of people, in this way enhancing the economy of India. Going through this study, it will explore & analyze some projects and case studies from many points of views, Geometrically, Architecturally, structurally, financially, and of course environmentally. The deployment of containers as building modules has grown in popularity over the past years due to their inherent strength, modular construction, and relatively low cost. Finally, conclusions are going to be drawn on the important worth of lean construction against the traditional practice with consideration for the future benefits within collaborative technological models.

Rapid safety monitoring and analysis of foundation pit construction using unmanned aerial vehicle images

With the large-scale development and construction of urban underground spaces, the safety monitoring of foundation pit construction has gained much attention. Current safety monitoring of foundation pits is often achieved through manual onsite measurements with complex equipment and relies on complicated methods, which are labour intensive, time consuming, and tend to ignore the risk of accidental collapses caused by serious local deformation. To address this issue, this study develops a rapid safety monitoring and analysis method for foundation pit construction using Unmanned Aerial Vehicle (UAV) images. The safe inclination angle of the foundation pit slope was proposed as the safety-monitoring index. Taking the images of the foundation pit captured by the UAV as input, point cloud reconstruction and surface fitting were carried out. The local deformation distribution was introduced to evaluate the local safety state of the foundation pit. The experimental results validate the potential advantages of the method.

Rapid construction of superhydrophobic fabric coating assisted with ‘Tyndall Effect’

ABSTRACT A simple, accurate and rapid construction method of superhydrophobic fabric coating was provided. Firstly, a homogeneous solution was obtained by dissolving a certain amount of silicone resin and polymethyl methacrylate (PMMA) in N,N-Dimethylformamide (DMF). Then, a nanocrystals solution system was made by adding ethanol to the homogeneous solution to induce the crystallization of PMMA. Finally, a superhydrophobic fabric coating was constructed by casting the nanocrystals solution on the surface of cotton cloth. “Tyndall effect”, scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), water contact angle (CA) and self-cleaning test were adopted to characterize the solution system and the coating. Results showed that the nanocrystals solution had obvious “Tyndall effect”. The water CA of the coating reached 153.1°, displaying obvious superhydrophobicity. Besides, concave-convex micro-nano structures were produced on the surface of the fabric coating and endowed it with good self-cleaning capacity.

An Intelligent Method for Rapid Construction of Time Sensitive Target Strike Chain

An Intelligent Method for Rapid Construction of Time Sensitive Target Strike Chain

Deformation modeling based on mechanical properties of liver tissue for virtuanormal vectors of trianglesl surgical simulation.

In this paper, a method for rapidly constructing a virtual surgical simulation system is proposed. A deformation model based on the mechanical properties of the liver and a rapid collision detection between the surgical micro-instruments and the liver tissue are included in this method. The purpose of this work is to improve the accuracy and real time of particle model deformation interaction in virtual surgery system. Firstly, a finite element model is established based on the constitutive model parameters of liver tissue. According to the simulation results, a mathematical model of node displacement is established. Secondly, the virtual liver is established based on the fast model reconstruction method, and the virtual manipulator is controlled by Geomagic Touch manipulator. Based on the hybrid bounding box, a rapid collision detection process between the instrument and liver is realized and the proposed deformation method is used to simulate the deformation of liver tissue. The simulation and experiment results show that the proposed deformation model can achieve high deformation interaction accuracy. The collision detection algorithm based on the hybrid bounding boxes can realize the collision between the liver and the instrument, and the established virtual surgical simulation system can simulate the liver tissue deformation in the case of small loading displacement. The effectiveness of the collision detection algorithm and deformation model was verified by an established virtual surgery simulation system. The proposed rapid construction method of virtual surgical simulation is feasible.

Digital Twin Workshop System Rapid Construction Method Based on Parallel Computing of Logic and Model Data

Digital Twin Workshop System Rapid Construction Method Based on Parallel Computing of Logic and Model Data

Study on the rapid construction method of large section vertical well in thick alluvium

ABSTRACT The rapid construction of a shaft is very important for shortening the shaft construction period and improving the mine economic benefits. In addition to the effects of hydrogeological conditions, the shaft construction speed also affects the selection of operation mode and the rationality of mechanical equipment. Considering the specific geological conditions of thick alluvium and large aquifers on the surface of auxiliary shaft in Fucheng mine, the main factors which affect the construction speed of the large-section vertical shaft in the thick alluvium are analyzed in this study. Based on the field investigations and hydrogeological conditions of the auxiliary shaft, the freezing method is determined as a rapid construction scheme for the auxiliary shaft as well as designing the arrangement of freezing holes and optimization of freezing parameters. The dynamic adjustment of freezing parameters is identified by studying the information provided by freezing construction technology. After shaft excavation, the deformation of the shaft lining in the alluvium section of topsoil is analyzed. It is concluded that the deformation of the shaft lining increases with the depth of the topsoil layer, however, the maximum deformation is within the allowable range of design. The short section excavation and masonry mixed operation mode is selected, and “five major and one deep” rapid mechanized operation lines are matched. The scientific operation cycle chart is compiled. And operation results fulfilled the actual needs. These results will provide guidance and reference significance for mine construction under similar geological conditions.

A successive flux estimation method for rapid g-function construction of small to large-scale ground heat exchanger

This paper presents a modification of the successive flux estimation algorithm of Pasquier and Marcotte (2013) [1] for computation of the so-called g-functions of small to large-scale ground heat exchanger fields. Fast calculation times are obtained by spectral convolution of the incremental flux signal and the borehole transfer function in an iterative scheme. An initial guess that is close to the solution and easily computable is also suggested for fast convergence. Further gains are obtained through the preprocessing of the transfer functions and the sub-sampling of the g-function. The proposed method was compared against the original successive flux estimation method, as well as two other rapid methods in the literature. Results show that the algorithm proposed in this work is by far the fastest and can generate a 40 year g-function of a large ground heat exchanger field composed of 400 randomly positioned boreholes in less than 4 s. The proposed approach is general and can manage fields composed of different number of boreholes and configurations.

Key Technologies of Seamless Location in Emergency Rescue

Objectives Emergency location is one of the key technologies for emergency rescue of major emergencies such as earthquake, fire, mine accident and so on. However, at the present stage, the research on the theory and technology of emergency location is still not systematized, the rapid construction method of seamless benchmark and collaborative location model for emergency location are not robust enough, and the lack of positioning terminals has become an urgent problem to be solved. Methods Firstly, we expound the research status at home and abroad according to the three commonly used emergency positioning modes of GNSS(global navigation satellite system), autonomous positioning and local area network electromagnetic wave positioning.Secondly, based on the technologies of emergency CORS(continuously operating reference stations) and UWB(ultra wide band) networking, a general emergency seamless positioning solution for many kinds of disasters is constructed. Then, the key technologies such as low power consumption of emergency positioning terminal manufacturing, synchronous information acquisition and efficient calculation of embedded firmware are overcome, and hardware equipment such as GNSS/UWB base station is developed. And, the emergency location service system is designed and developed, which solves the problems of emergency position networking, personnel location and on-site scheduling. Finally, the message transmission protocol of emergency navigation and location service system is proposed, which promotes the development of emergency rescue equipment standardization. Results Through the research on the key technologies such as the manufacture of emergency location terminals such as GNSS/UWB base station, the development of emergency location and location service system based on cloud platform, and the formulation of message transmission protocol of emergency navigation and location service system, we put forward a seamless positioning solution for indoor and outdoor under emergency conditions, which solves the problems of rapid construction of indoor and outdoor seamless positioning datum, personnel positioning and command scheduling in emergency. Conclusions The purpose is to create an emergency-oriented indoor seamless positioning technology system and innovate the existing emergency positioning technology methods.

Fatigue performance of an innovative shallow-buried modular bridge expansion joint

Bridge expansion joint can accommodate the deformation under the effects of vehicle load and temperature. Fatigue damage readily occurs because it is directly subjected to repeated load. In this paper, fatigue and static loading tests were conducted on modular bridge expansion joint (MBEJ). This is an innovative type of shallow-buried modular bridge expansion joint, and the anchoring depth is reduced by 40%-50% compared with traditional ones. The reduced overall height can well adapt to the slide shutter rapid construction method in practical engineering. A loading device was designed to simulate vertical and horizontal load. The load-deflection relationship after fatigue loading were discussed. The fatigue crack types, crack initiation locations, failure criteria, and fatigue failure modes of MBEJs were also studied. Following that, a finite element model was established to calculate the internal force of welded connections. Structural analysis on MBEJs was used to calculate the stress range within center beam and support bars under the test conditions. A theoretical fatigue performance assessment method on MBEJs was introduced, which is based on the nominal stress method and a linear Miner damage accumulation rule. The theoretical prediction agreed well with the experimental observations.

New Asynchronous-Pouring Rapid-Construction Method for Long-Span Prestressed Concrete Box Girder Bridges with Corrugated Steel Webs

AbstractBased on the traditional hanging basket cantilever construction of the prestressed concrete box girders, combined with the excellent shear capacity of the corrugated steel webs (CSWs), this...

Validation of a site-specific recombination cloning technique for the rapid development of a full-length cDNA clone of a virulent field strain of vesicular stomatitis New Jersey virus

This study reports the use of a site-specific recombination cloning technique for rapid development of a full-length cDNA clone that can produce infectious vesicular stomatitis New Jersey virus (VSNJV). The full-length genome of the epidemic VSNJV NJ0612NME6 strain was amplified in four overlapping cDNA fragments which were linked together and cloned into a vector plasmid by site-specific recombination. Furthermore, to derive infectious virus, three supporting plasmid vectors containing either the nucleoprotein (N), phosphoprotein (P) or polymerase (L) genes were constructed using the same cloning methodology. Recovery of recombinant VSNJV was achieved after transfecting all four vectors on into BSR-T7/5 cells, a BHK-derived cell line stably expressing T7 RNA polymerase (PMID: 9847328). In vitro characterization of recombinant and parental viruses revealed similar growth kinetics and plaque morphologies. Furthermore, experimental infection of pigs with the recombinant virus resulted in severe vesicular stomatitis with clinical signs similar to those previously reported for the parental field strain. These results validate the use of site-directed specific recombination cloning as a useful alternative method for rapid construction of stable full-length cDNA clones from vesicular stomatitis field strains. The approach reported herein contributes to the improvement of previously published methodologies for the development of full-length cDNA clones of this relevant virus.

Novel Method for Rapidly Constructing Active Power Steady-State Security Regions Incorporating the Equivalent Reactances of TCSCs

Active power steady-state security regions (APSSRs), which can provide guidance for prevention and control through security checks, is of great importance for the safe operation of power systems in which more and more sustainable energy power generation is integrated. As a mature flexible AC transmission system (FACTS) device, thyristor-controlled series compensators (TCSCs) can carry out series compensation for the transmission line by controlling its equivalent reactance. With the change of the equivalent reactance parameter of a TCSC, the nodal admittance matrix and power flow distribution of the power system also changes. Inevitably, the APSSR will be different. Therefore, it is necessary and important to further incorporate the equivalent reactance parameters of TCSCs in the APSSR expression, which is generally established in the space of node active power injections. In this paper, a rapid construction method of APSSRs incorporating the equivalent reactances of TCSCs is proposed. Firstly, applicability and efficiency of the conventional APSSR construction method for power systems with TCSCs are analyzed. Further, with equivalent disconnection of TCSC branches, the effect of TCSC equivalent reactances on the distribution of active power flow through changing the structure parameters is treated as modifying node active power injections. On this basis, explicit expressions of APSSRs with a single TCSC equivalent reactance parameter and double TCSC equivalent reactance parameters are derived, respectively. Moreover, by deducing the general formula of APSSRs with multiple TCSC equivalent reactance parameters, the feasibility of the proposed method for power systems with multiple TCSCs is analyzed. Eventually, via benchmarks with different scales and a different number of TCSCs, validity and superiorities of the proposed method in computational efficiency are demonstrated.

Rapid Construction of Virtual Scenes for Large-Scale Crops Distribution

With the development of computer hardware and virtual reality technology and its head-mounted display (HMD), the scale of the virtual environment that it can simulate is also growing, and related fields include forest simulation, virtual agriculture simulation and so on. However, it is urgent to solve the problem of slow construction speed of the scenes which include different kinds of three-dimensional models in the engineering practice. Aiming at the problem of crops planting by blocks in regular regions, a virtual scene construction method based on improved K-means clustering algorithm is proposed. For crops planting problems in irregular regions, we adapt the idea of visually adjusting the key points in regional boundaries to determine the region of planting crops in the virtual environment, proposing a rapid construction method of virtual scene based on Catmull-Rom Spline and Even-Odd Algorithm.

A cerebellar window for intravital imaging of normal and disease states in mice.

The cerebellum is a prominent part of the vertebrate hindbrain that is critically involved in the regulation of important body functions such as movement coordination, maintenance of balance and posture, and motor control. Here, we describe a cerebellar window that provides access to the mouse cerebellum for intravital imaging, thereby allowing for a detailed characterization of the dynamic processes in this region of the brain. First, the skull overlying the cerebellum is removed, and then the window is applied to the region of interest. Windows may be exchanged depending on the desired imaging modality. This technique has a variety of applications. In the setting of medulloblastoma, spontaneous or orthotopically implanted lesions can be imaged, and tumor morphology and size can be monitored using ultrasonography. Multiphoton laser-scanning microscopy (MPLSM) or optical-frequency-domain imaging (OFDI) can be applied for in vivo visualization and analysis of cellular and vascular structures in a variety of disease states, including malignancies and ataxia telangiectasia. This protocol describes a novel and rapid method for cerebellar window construction that can be set up in under an hour.

Self-Assembly Cloning: A Rapid Construction Method for Recombinant Molecules From Multiple Fragments

Protocol Summary Enzyme-free cloning (EFC) can rapidly produce an in-frame fusion gene with multiple fragments. To practically apply EFC, we investigated the extent and sequence of complementary staggered overhangs necessary to direct self-assembly of multiple fragments as well as a size limitation of the constructed DNA molecule. Six-base pair overhangs with 50% GC content were sufficient to direct self-assembly. A functional plasmid that exceeded 10 kb, which includes an in-frame fusion domain, was efficiently constructed from four PCR fragments in one step by our improved method.