Publications

INVESTIGATION OF CYCLIC BEHAVIOR OF FULL-SCALE TREE-LIKE HOLLOW STRUCTURAL SECTION COLUMNS WITH INFILLED CONCRETE

The cyclic behavior of tree-like hollow structural section (HSS) columns with infilled concrete was experimentally and numerically investigated. A full-scale column, with the height of 3.2 m and the treetop plan dimension of 4 m×3 m, was designed and manufactured according to a practical engineering prototype. The column with a capacity protected reinforced concrete foundation was tested under combined constant axial compression and cyclic lateral loading through a specifically designed setup. The cracking and spalling of the reinforced concrete foundation were observed initially, followed by yielding of the bottom end of the primary branches when the story drift ratio reached 1.00%. The specimen failed by fracture of the full penetration groove welded splices in the petal-shaped trunk embedded in the foundation when the story drift ratio reached 3.00%. A detailed finite element analysis model for the tree-like column was then established and verified. Parametric studies were conducted to investigate the influence of the axial load level, filling range of concrete, steel yield strength, and the height to width ratio of the petal-shaped trunk. Finally, some design considerations were proposed.

Rational Side-Chain Amino Acid Substitution in Firefly Luciferase for Improved Thermostability

Improvement strategies for thermal comfort of a city block based on PET Simulation— A case study of Dalian, a cold-region city in China

[Cloning and functional analysis of glnB from Azospirillum brasilense Yu62].

STUDY ON THE MECHANICAL BEHAVIOR OF GFRP PLATE-CONE CYLINDRICAL RETICULATED SHELL

Plate-cone reticulated shell is a new type of spatial structures through innovation and development by authors. In this paper, GFRP composite is applied to the cones of plate-cone reticulated shell. Through model test for the first time, the ultimate bearing capacity, load transmission way and the whole destroy process of GFRP plate-cone cylindrical reticulated shell are studied deeply. Through comparing with the results of the ANSYS simulation, the correctness of the theoretical analysis and structure reliability are verified, the stress mechanism and damage characteristics of composite plate-cone reticulated shell are revealed and summarized. Theoretical basis and suggestions in the design for GFRP plate-cone reticulated shell are provided in the paper for application of this type of structure in the field of practical construction.

Electrostatic Field Calculation and Structure Optimization of New Shield Ring of 1000 kV Nan-Jing Loop Transmission Line

Ambient Vibration Test and Retest of a Multistory Factory Building

Multistory industrial buildings have become prevalent in sectors such as electronics, machinery, pharmaceuticals, and textiles due to limited space in urban environment. There is usually a strict requirement of machine operation on the building vibration, so that it becomes relevant to quantify the structural dynamical characteristics, e.g., natural frequencies, damping ratios, and mode shapes. This paper presents a multisetup ambient vibration test and retest conducted in a multistory industrial building located in Haining, China, using eight triaxial accelerometers to cover 36 measurement locations in six setups during normal operations and shutdown condition. These tests followed a nearly identical test configuration with minor local discrepancies. To obtain the primary modal parameters of the structure, a Bayesian multisetup modal identification algorithm is adopted, followed with a detailed analysis of the results. Furthermore, the floor serviceability is investigated, primarily focusing on worker comfort. The study reveals several interesting phenomena, such as the impact of structural expansion joints and sensor synchronization on the identification results. This study serves as a demonstrative effort in examining the dynamic characteristics of multistory industrial buildings. It provides insight into evaluating the dynamic characteristics with limited sensors and abnormal identification results.

Impacts of NaCl stress on photosynthesis and PSII photochemical activity of peppermint( Mentha piperita L. )

We employed portable photosynthesis dectector and chlorophyll fluorometer to address the impacts of different concentrations of NaCl stress on photosynthesis and PSII photochemical activity of peppermint. Results show that concentration-dependent variation exhibits for the growth and biomass of peppermint under NaCl stress. Peppermint can normally grow under 100 and 150 mmol /L NaCl stress. Photosynthesis and PSII photochemical activity of peppermint are significantly decrease and electron transfer between QAand QBis inhibited with the increase of NaCl concentration. The impact of photosynthesis on plant growth and metabolism is quite significant under NaCl stress. PSII is the most sensitive component in a photosynthetic system,and so important in the response of photoynthesis to environmental stress.

Finite Element Analysis of Two Kinds of Dump Trunk

Axial behavior variation of 72-story concrete-filled steel tubes with different joint connections due to interface debonding considering long-term deformation of concrete core

Conclusions and Future Perspectives of IBCC 2019

Compressive properties of bamboo lamina under Combined Loading Compression (CLC) test

Research Progress on Bovine Ephemeral Fever

Bovine ephemeral fever(BEF),which is also commonly known as three-day stiff-sickness,is an infectious disease caused by an arthropod-borne rhabdovirus bovine ephemeral fever virus(BEFV)affecting cattle and water buffalo(Bubalus bubalis).Infection results in fever,stiffness and a temporary reluctance to move followed,usually,by complete recovery.Economic losses are attributed to mortality of infectious animals,abortion,decreased milk production,reduced weight gain and lowered fertility of bulls.This article reviewed research advances in the history of BEF,epidemiology,etiology,pathogenesis,clinical symptoms,diagnosis,prevention and treatment of BEF caused by BEFV in the world,and the information present here would provide references for further studies of BEF.

Study on the public's tolerance to the qualification defects of grass-roots civil servants and its inspiration

Public tolerance is an important factor of civil servants constraint mechanism. This paper, based on the quality of the grass-roots civil competency model and the zero tolerance concept, uses questionnaires to explore the current situation and influencing factors of public tolerance to the quality of the grass-roots civil servants defect. The first research that studies on 1 022 persons shows the public's tolerance to the qualification defects of grass-roots civil servants consists of five dimensions: tolerance to capability defects, tolerance to bad attitudes,tolerance to moral deficiencies, tolerance to corruption and tolerance to low achievements; different demographic variables have different effects, but there is no difference for the gender factor. The second research on 476 respondents shows that people have a relative higher tolerance to capability defects, but lower tolerance to corruption; influencing factors of public tolerance are harmfulness, plasticity, universality and discipline of the qualification defects of grass-roots civil servants and its direct connection with public interest. In the end, this paper puts forwards some suggestions as to constructing a social and ethical environment for improving the qualification of grass-roots civil servants from the perspective of tolerance.

Chemical constituents from roots of Ferula sinkiangensis

Objective To study the chemical constituents of the roots of Ferula sinkiangensis. Method Compounds were isolated by repeated chromatography on silica gel. Their structures were elucidated by chemical and spectroscopic methods. Result Seven compounds were identified as fekrynol (1), fekolone (2), farnesiferol B (3), isosamarcandin (4), episamarcandin (5), farnesiferol C (6), umbelliferone (7). Conclusion All the compounds were obtained from this plant for the first time.

Lightweight glubam structures manufactured using industrialized ply-bamboo panels

One or two stories lightweight glubam structures based on industrialized ply-bamboo panels, along with corresponding mechanical researches have been introduced in this paper. The main structural elements, especially the lightweight frame shear wall with its metal connections, and its mechanical performance have been studied in recent 10 years. The modelling and design of such structure can be based on connection system information. The performance of a prototype house from 2009 to 2019 were also reported at the end of this paper. Existing researches indicated that the lightweight glubam structures has large potential to be widely used as residential or small commercial structures in city or rural regions.

POWER FLOW ANALYSIS OF BRIDGE U-RIB STIFFENED PLATES BASED ON THE CONCEPT OF STRUCTURAL INTENSITY

Due to its advantages of good mechanical properties, simple appearance and strong adaptability, the steel box girder is being widely utilized in urban bridges. The noise radiated by steel box girders subjected to vehicle impacts has the characteristics of wide-spectrum, high-magnitude and control difficulty. U-rib stiffened roof, as a part of the steel box girder, directly bears the input load, which is the basis of studying the vibration of the steel box girder. Currently, the investigation on the vibro-acoustic performance of U-rib plates is very limited. With this regard, this paper introduces the concept of Structural Intensity (SI). The SI vector is calculated by the Finite Element (FE) method. The power flow is visualized by the self-programming post-processing code. The global and local vibration energy transmission characters of a U-rib stiffened plate under a harmonic nodal force are analyzed. Further, the influence of plate thickness is investigated. The optimum design is carried out based on the engineering standard dimensions. The research results indicate that increasing the thickness ratio of the U-rib to the baseplate is beneficial to reducing the vibration.

An adaptive harmony search algorithm based on positive feedback for network reconfiguration

Distribution network reconfiguration is a complex and discrete nonlinear combinatory optimization problem. In this paper, an adaptive harmony search algorithm based on positive feedback (PFAHSA) is proposed to solve the problem for reducing power loss in distribution systems. The PFAHSA incorporates a local optimal method based on positive feedback mechanism into traditional harmony improvising criteria for better utilization of harmony memory (HM) and higher convergence speed. The algorithm parameters are updated adaptively by modified entropy, which measures the diversity of HM, to avoid prematurity and improve search success rate. The proposed method is testified on the IEEE 33- and 69-bus systems and is compared with other conventional approaches. Simulation results show that the proposed method features faster optimization speed and better global convergence performance.