bluuebunny/crossref_metadata_2025 huggingface dataset:
Biological control in the remaining Caribbean islands.
Authors: Lenteren J. C. van , Bueno V. H. P.
Published: December 2019

Biological control activities on 18 (groups of) Caribbean islands are summarized. Many natural enemies were introduced to these islands through Trinidad and Tobago up to 1980. Also, inter-island exchange of biocontrol agents took place. The majority of projects concerned classical biocontrol, while in some cases natural, conservation and augmentation biocontrol were used. Successes were obtained with biocontrol of pests in crops such as arrowroot, citrus, coconut, cotton and sugarcane and of weeds like prickly pear and puncture vine. After 1980, the number of natural enemy introductions decreased, though the region was faced with many invasions by exotic pests, including the citrus leaf miner, citrus blackfly, papaya mealybug, giant African snail, coconut whitefly and pink hibiscus mealybug. Two large region-wide programmes resulted in successful biocontrol of the pink hibiscus mealybug and the papaya mealybug. In addition, biocontrol by a native natural enemy complex was demonstrated for the coconut whitefly and the passion vine mealybug. The Food and Agriculture Organization of the United Nations (FAO) Code of Conduct for the Import and Release of Exotic Biological Control Agents has recently been applied in the region. Farmers Field Schools, with the aim to enable farmers to use IPM and become less dependent on chemical pesticides, are being implemented.
Biological control in Suriname.
Authors: Sauers-Muller A. van , Jagroep M.
Published: December 2019

Research on biological control in Suriname started in the 1910s with reports of native entomopathogenic fungi attacking pests in coffee, followed by native predators attacking pests in cotton in the 1920s. Many other native natural enemies of crop pests were identified in the period up to the 1970s and prospecting for natural enemies has been a continuous activity in Suriname. An example of successful biocontrol is that of the coconut caterpillar, which is attacked by various native parasitoids, a fungus and several predators. A number of other pests hardly pose a problem for the crops they attack, due to the presence of native natural enemies. In cassava, for example, the green cassava mite seldom causes damage to the crop. Also in citrus, several scales are kept under natural control by parasitoids, a ladybird and a mite, resulting in little use of pesticides. A recent example of classical biocontrol is that of the pink hibiscus mealybug, which was rapidly brought under control after its introduction by the release of a predatory beetle and a parasitoid. Recently, much work has been done on IPM of the invasive carambola fruit fly, which may include a biocontrol element involving the release of exotic parasitoids.
Biological control in Trinidad and Tobago.
Authors: Khan A. , Isaac W. A. P.
Published: December 2019

Since 1918, Trinidad and Tobago has been a rich source of biological control agents and has shipped numerous natural enemies both regionally and internationally. Successful classical biocontrol programmes using predominantly predators and parasitoids began in earnest in the 1970s, initially for Aeneolamia varia saccharina and then for Diatraea saccharalis control in sugarcane. Several other pests, including citrus blackfly Aleurocanthus woglumi, diamondback moth Plutella xylostella and pink hibiscus mealybug Maconellicoccus hirsutus, were successfully managed using biocontrol. The use of microbial agents, particularly entomopathogenic fungi, has also been assessed. Metarhizium anisopliae has caused high nymphal and adult mortality in A. varia saccharina, while Paecilomyces tenuipes has caused as much as 67% larval mortality in P. xylostella. Over the past 10 years there has been an increase in the number of exotic insect species in Trinidad and Tobago, and classical biocontrol has played and is expected to keep playing an important role in managing these invasive pests.
Biological control in Uruguay.
Authors: Basso C. , Ribeiro A. , Cibils X. , Chiaravalle W. , Punschke K.
Published: December 2019

The first reported case of biological control in Uruguay was an attempt to import the parasitoid Encarsia berlesei from Italy to manage the white peach scale in 1912, which failed due to high mortality during the long boat trip. Later introduction of the same parasitoid (in 1913) and the predator Lindorus lophanthae (in 1915) resulted in permanent control of peach scale. In the early 20th century, Uruguay was a pioneer in South America in the successful introduction of natural enemies of pests recently arrived in the country and was also a provider of biocontrol agents to other countries in the region by re-exporting these exotic species. Throughout this century the introduction and colonization of biocontrol agents continued. In the 1980s and 1990s, national production of entomopathogens and parasitoids was initiated. During this period (and until today), large-scale prospecting projects were executed to find and identify native natural enemies and microbial control agents in several important crops. The largest areas under classical biocontrol are currently in pine and eucalyptus plantations. Recently, government regulations for the registration and control of biocontrol products have been established in Uruguay. The first commercial biocontrol products on the market are used to manage pests in horticultural crops in greenhouses and for field crops such as soybeans, intended for local consumption and for export. Uruguay aspires to be recognized for the production of high-quality food. Biocontrol helps to realize this aspiration, because it contributes to food safety and adds to environmental protection.
Sweet potato: breeding and genetics.
Authors: Lebot V.
Published: December 2019

This chapter focuses on the various objectives and selection criteria that need to be addressed for the success of sweet potato breeding. Information on the sexual reproduction, incompatibility and sterility, crossing techniques and true seed production, selection methods and programmes, heritability of major traits, genotype environment interactions, use of related species, use of molecular markers, transgenic technologies and germplasm conservation of sweet potato are also discussed.
Yams: origin and history.
Authors: Lebot V.
Published: December 2019

Dioscorea spp. are found throughout the tropics, and different species of edible yams have been domesticated independently in America, Africa, Madagascar, South and South-east Asia, Australia and Melanesia. This chapter focuses on the domestication, discovery, and present geographical distribution of yams.
Yams: agronomy.
Authors: Lebot V.
Published: December 2019

This chapter discusses seed systems and propagule selection, propagation, soil preparation, plant densities and crop establishment, intercropping, weeding, fertilizers and nutrient disorders, and harvesting in yam production.
Aroids: origin and history.
Authors: Lebot V.
Published: December 2019

This chapter discusses the domestication, discovery, and present geographical distribution of aroids. The problems associated with the origin, domestication and spread of taro are also discussed.
Analysis of Spectroscopy: Mustard Greens Leaf of Chlorophyll as a Ba0.2Sr0.8TiO3 (Barium Strontium Titanate) Film Dopant
Authors: Palupi Endah Kinarya , Irzaman  , Alatas Husin , Yuliarto Brian , Umam Rofiqul , Andriana Bibin Bintang , Sato Hidetoshi
Published: December 2019

In this paper, [Inline formula] deposition method with spin coating technique in order to improve its dielectric properties. This study was to find out how the effect of mustard chlorophyll exposure on [Inline formula] films was analyzed using x-ray diffraction and micro-Raman spectroscopy
based on crystal structure and the stability of the film phase BST doping mustard chlorophyll. The annealing process is carried out as a high temperature heating step which aims to restore the physical and crystalline properties of the film which may change during the film growth process.
The specified annealing temperature is 850 °C with a holding time of 8 h. The effect of chlorophyll solidification was observed by applying variations of chlorophyll mustard concentration, namely 0%, 2.5%, and 5%. The crystal structure type and film lattice parameters were
confirmed using X-Ray Diffraction with the measurement angle starting from an angle of 10° to 80° with an angle increase of 0.02°.
Simulation and Experiment Study of Chain Aggregate Structure in Magnetic Fluid
Authors: Ying Yu , Xu Ke , Si Guang-Yuan , Zhao Ji-Zhong
Published: December 2019

Magnetic fluid is a novel magnetic functional material. The magneto-optical properties are displayed due to the tunability. In the paper, the material characterization was studied theoretically and experimentally. In the simulation, a rod-like magnetic nanoparticle model was used to
simulate the motion of the magnetic particles. In the experiment, an experimental setup was designed to observe the change of the microstructure. The results showed that the magnetic particles can be aggregated to form several magnetic chains when the applied magnetic field exceeded 100 Oe.
The novel magneto-optical device exhibits advantages of low cost, small size, and easy formation.
Effect of Copper Doping on Electrical Properties of Polymer Blend CdSe Films Prepared by Chemical Method
Authors: Rani Amita , Tripathi S. K. , Kurchania Rajnish , Singh Mahender
Published: December 2019

The present statement deals with the study of electrical conductivity measurements of CdSe-PVA undoped and CdSe-PVA doped with CU nanocomposite by chemical method. In the electrical measurements, the dark conductivity (σd) and the photoconductivity (σph)
of CdSe and CDSE:Cu prepared thin films have been studied in the temperature cycle 308–343 K. The intensity on conductivity and effect of temperature has been analyzed for CdSe and CdSe:Cu nanocomposite films. The conductivity of every sample increases with increasing temperature
representing the semiconducting activities of the sample. The value of dark activation energy is more than the photo activation energy due to the shift in energy levels under illumination.
Ferroelectric Memristive Networks for Dimensionality Reduction: A Process for Effectively Classifying Cancer Datasets
Authors: Raj P. Michael Preetam , Louis V. Jeffry , Chatterjee Sumit Kumar , Kanungo Sayan , Kundu Souvik
Published: December 2019

In this work, a copper-doped (5%) zinc oxide (Cu:ZnO) ferroelectric materials-based memristor model was realized and it was employed to develop principal component analysis (PCA), a data dimension reduction technique. The developed PCA was utilized to efficaciously classify breast cancer
datasets, which are considered as complex and big volumes of data. It was found that the controllable memristance variations were analogous to the weight modulations in the implemented neural network-based learning systems. Sanger’s rule was utilized to achieve unsupervised online learning
in order to generate the principal components. On one side, the developed memristor-based PCA network was found to be effective to isolate distinct breast cancer classes with a high classification accuracy of 97.77% and the error in the classification of malignant cases as benign of 0.529%,
a significantly low value. On the other side, the power dissipation was found to be 0.27 µW, which suggests the proposed memristive network is suitable for low-power applications. Further, a comparison was established with other existing non-memristor and non-PCA-based data classification
systems. Furthermore, the devised less complex equations to implement PCA on this memristive crossbar array could be employed to implement any neural network algorithm.
Functional interactions between Mi-2β and AP1 complexes control response and recovery from skin barrier disruption
Authors: Shibata Sayaka , Kashiwagi Mariko , Morgan Bruce A. , Georgopoulos Katia
Published: December 2019

Keratinocytes respond to environmental signals by eliciting induction of genes that preserve skin’s integrity. Here we show that the transcriptional response to stress signaling is supported by short-lived epigenetic changes. Comparison of chromatin accessibility and transcriptional changes induced by barrier disruption or by loss of the nucleosome remodeler Mi-2β identified their striking convergence in mouse and human keratinocytes. Mi-2β directly repressed genes induced by barrier disruption by restricting AP1-enriched promoter-distal sites, occupied by Mi-2β and JUNB at steady state and by c-JUN after Mi-2β depletion or stress signaling. Barrier disruption led to a modest reduction in Mi-2β expression and a further selective reduction of Mi-2β localization at stress response genes, possibly through competition with activated c-JUN. Consistent with a repressive role at stress response genes, genetic ablation of Mi-2β did not prevent reestablishment of barrier integrity but was required for return to homeostasis. Thus, a competition between Mi-2β–repressive and activating AP1 complexes may permit rapid transcriptional response to and resolution from stress signaling.
Hydromagnetic Carreau Nanoliquid in Frames of Dissipation and Activation Energy
Authors: Waqas M. , Naz Saira , Hayat T. , Ijaz Khan M. , Alsaedi A.
Published: December 2019

The novel characteristics of magnetic field and entropy generation in mixed convective flow of Carreau fluid towards a stretched surface are investigated. Buongiornio nanoliquid model consists of thermophoresis and Brownian movement aspects is opted for analysis. Energy expression is modeled subject to thermal radiation and viscous dissipation phenomenon. Concentration by zero mass flux condition is implemented. Consideration of chemical reaction and activation energy characterizes the mass transfer mechanism. Total entropy generation rate and Bejan number is formulated. The utilization of transformation variables reduces the PDEs into non-linear ODEs. The obtained nonlinear complex problems are computed numerically through Shooting scheme. The impact of involved variables like local Weissenberg number, magnetic parameter, thermal radiation parameter, Brownian motion parameter, thermophoresis parameter, buoyancy ratio parameter, mixed convection parameter, Prandtl parameter, Eckert number, Schmidt number, non-dimensional activation energy parameter, chemical reaction parameter, Brinkman number, dimensionless concentration ratio variable, diffusive variable and dimensionless temperature ratio variable on velocity, temperature, nanoparticles concentration, entropy generation, Bejan number, surface drag force and heat transfer rate are examined through graphs and tables.
Uncertainty Relations for Coherence*
Authors: Luo Shun-Long , Sun Yuan
Published: December 2019

Quantum mechanical uncertainty relations are fundamental consequences of the incompatible nature of noncommuting observables. In terms of the coherence measure based on the Wigner-Yanase skew information, we establish several uncertainty relations for coherence with respect to von Neumann measurements, mutually unbiased bases (MUBs), and general symmetric informationally complete positive operator valued measurements (SIC-POVMs), respectively. Since coherence is intimately connected with quantum uncertainties, the obtained uncertainty relations are of intrinsically quantum nature, in contrast to the conventional uncertainty relations expressed in terms of variance, which are of hybrid nature (mixing both classical and quantum uncertainties). From a dual viewpoint, we also derive some uncertainty relations for coherence of quantum states with respect to a fixed measurement. In particular, it is shown that if the density operators representing the quantum states do not commute, then there is no measurement (reference basis) such that the coherence of these states can be simultaneously small.
Parameterized Post-Post-Newtonian Light Propagation in the Field of One Spherically-Symmetric Body*
Authors: Zhu Xiao-Yan , Yang Bo , Jiang Chun-Hua , Lin Wen-Bin
Published: December 2019

We derive a more generally parameterized post-post-Newtonian solution for the light propagation in the gravitational field of one spherically-symmetric body. Based on the solution for the light velocity, we give the formula of the light deflection when both the emitter and receiver are located in the regions far away from the body, which is the most important scenario in the real applications. Our results can be applied to more metric theories of gravitation.
Relativistic Self-Focusing of Hermite-cosh-Gaussian Laser Beam in Magnetoplasma with Exponential Plasma Density Ramp
Authors: Kant Niti , Vij Shivani , Chakravarti Sudarshan Kumar , Kushwaha Juleshwar Prasad , Thakur Vishal
Published: December 2019

In the present manuscript, we analyse the effect of exponential plasma density ramp for relativistic self-focusing of Hermite-cosh-Gaussian laser pulse in magnetoplasma. The exponential plasma density ramp is found to be more prominent in achieving the stronger self-focusing of Hermite-cosh-Gaussian laser beam in comparison to the tangential plasma density ramp. We propose a theoretical model for propagation of Hermite-cosh-Gaussian laser pulse in magnetoplasma with exponential density ramp. The nonlinearity in the medium arises because of the relativistic motion of electrons, being responsible for relativistic self-focusing. Equation of the beam width parameter is set up by taking the expression for the dielectric function and following Wentzel-Kramers-Brillouin (WKB) with paraxial ray approximations for mode indices m = 0, 1 and 2. Effect of decentered parameter is also analysed, which results in stronger self-focusing of the Hermite-cosh-Gaussian laser beam. Stronger self-focusing of laser beam is more pronounced in high density plasma with higher magnetic field.
The Effects of Wettability on Primary Vortex and Secondary Flow in Three-Dimensional Rotating Fluid*
Authors: Zhou Si-Hao , Qiu Wen , Ye Yong , He Bing , Wen Bing-Hai
Published: December 2019

The secondary flow driven by the primary vortex in a cylinder, generating the so called “tea leaf paradox”, is fundamental for understanding many natural phenomena, industrial applications and scientific researches. In this work, the effect of wettability on the primary vortex and secondary flow is investigated by the three-dimensional multiphase lattice Boltzmann method based on a chemical potential. We find that the surface wettability strongly affects the shape of the primary vortex. With the increase of the contact angle of the cylinder, the sectional plane of the primary vortex gradually changes from a steep valley into a saddle with two raised parts. Because the surface friction is reduced correspondingly, the core of the secondary vortex moves to the centerline of the cylinder and the vortex intensity also increases. The stirring force has stronger effects to enhance the secondary flow and push the vortex up than the surface wettability. Interestingly, a small secondary vortex is discovered near the three-phase contact line when the surface has a moderate wettability, owing to the interaction between the secondary flow and the curved gas/liquid interface.
Numerical study of ubiquitous modes in tokamak plasmas in the presence of impurities
Authors: Shen Yong , Dong Jiaqi , Peng Xiaodong , Li Jia , Han Mingkun
Published: December 2019

As an important branch of trapped electron modes (TEMs), the ubiquitous mode (UM) is a favored subject for the investigation of anomalous energy losses in magnetic fusion plasmas. In this paper, the numerical study of UMs was carried out in tokamak plasmas in the presence of impurities. The physical model and the gyrokinetic equations for TEM (and UM) instability is introduced, including the impurity effect. The numerical results show that impurity species impose significant impacts on the UM instability in many ways, one of which is that impurity effect on UMs is generally stabilizing, and on the whole the stabilizing effect is most pronounced for the case of −0.8 ≲ L
ez < 0 (

L

ez

≡

L

n
e

/

L

n
z

,

with

L

n
s

=
−

∂

ln

n

s

/
∂
r

−
1

). As the impurity charge concentration

f

z

increases, or for the heavier or lower-ionized impurity ions, the UM instability is weaker. Compared to the ion and electron temperature gradient effects, impurity temperature gradient (expressed by

η

z

=

L

nz

/

L

Tz

) has only a minor effect, while the ratio of electron to impurity temperature

τ

z

has a relatively larger effect on UMs, embodied in the mode linear growth rates and instability windows. The investigation of wavenumber threshold for UM showed that the mode was a fluid-like instability when

b

i

≡

1
2

k

θ

2

ρ

s

2

∼

n
/

n

e
T

3

,

and the presence of impurity resulted in the modification of the UM instability window. By surveying the parametric dependences of UMs in the presence of impurities, it is revealed that comparatively, the stabilizing effects of impurity is more pronounced in the regime of larger wavenumber, while the weakening effects of (i) decreasing the fraction of trapped electrons, (ii) increasing the magnetic shear, or (iii) decreasing the electron density gradient on UM instability are relatively more pronounced in the regime of smaller wavenumber. It also indicates that the stabilizing effect of impurity on UMs is owing to the non-resonant mechanism of the UM.
Creutz ladder in a resonantly shaken 1D optical lattice
Authors: Kang Jin Hyoun , Han Jeong Ho , Shin Y
Published: December 2019

We report the experimental realization of a Creutz ladder for ultracold fermionic atoms in a resonantly driven 1D optical lattice. The two-leg ladder consists of the two lowest orbital states of the optical lattice and the cross inter-leg links are generated via two-photon resonant coupling between the orbitals by periodic lattice shaking. The characteristic pseudo-spin winding structure in the energy bands of the ladder system is demonstrated using momentum-resolved Ramsey-type interferometric measurements. We discuss a two-tone driving method to extend the inter-leg link control and propose a topological charge pumping scheme for the Creutz ladder system.
Control of neoclassical tearing mode by synergetic effects of resonant magnetic perturbation and electron cyclotron current drive in reversed magnetic shear tokamak plasmas
Authors: Tang Weikang , Wang Zheng-Xiong , Wei Lai , Wang Jialei , Lu Shuangshuang
Published: December 2019

Synergetic effects of resonant magnetic perturbation (RMP) and electron cyclotron current drive (ECCD) on stabilizing neoclassical tearing mode (NTM) in reversed magnetic shear (RMS) tokamak plasmas are numerically investigated based on a set of reduced MHD equations. For the moderate separation, it is found that the explosive burst induced by the fast reconnection of double tearing mode (DTM) in the RMS configuration can be completely suppressed by externally applied RMPs. Zonal flows with strong shear induced by a rotating RMP play an important role in this suppression process. Moreover, turning on ECCD in advance is essential to mitigate the NTM. For the large separation without the explosive burst, two strategies, i.e. a continuous ECCD with static RMP and a modulated ECCD with rotating RMP, are separately investigated. It is shown that when the NTM is decelerated by a relatively slow rotating RMP, the modulated ECCD can have a better stabilizing effect. In addition, the ECCD deposition widths in both radial and helical angle directions, as well as the ECCD on-duty time, are analyzed in detail. The best effectiveness of ECCD is obtained and the relevant physical mechanisms are discussed.
Analysis of shear failure process of jointed rock
Authors: Ke Changren , He Tingting , Wen Qingwei
Published: December 2019

Based on regular sawtooth joint specimens with four fluctuating angles, the shear tests under five normal stresses were carried out to get the test curve. The shear stress-shear displacement curves and different failure modes of joints were analyzed. The law of shear strength weakening stage was studied by using shear strength weakening ratio. It was concluded that when the normal stress is small and the undulation angle is large, the value of shear strength weakening ratio is larger, and it has a good linear relationship with the undulation angle.
The Theoretical Model And Numerical Solution Of Heat Flow Coupling Considering Fractal Characteristics Of Rock Fractures
Authors: Xu Xiaochen , Zheng Qiwen , Dai Chunhua , Li Hongqiang , Gao Shang
Published: December 2019

In order to analyze the temperature distribution law in rough fissured rock mass more truly, the fractal dimension of fractal theory is used to make statistics on the roughness of fissured surface, and a heat flow coupling theoretical model considering the fractal characteristics of fissured surface of rock mass is established. By building a geometric model containing rough fissured surface and numerical simulation by software, the more real temperature distribution law in rough fissured rock mass is analyzed. The simulation results show that the temperature distribution in rough fissured rock mass appears channeling phenomenon, and convection plays a leading role in the temperature distribution, and the existence of fissured seepage leads to a relatively low temperature zone in the rock mass.
Suitability Evaluation of Land Reclamation——Taking the Project Area of Baoguo Old Town in Beipiao City as an Example
Authors: Li Qi , Biao Peng
Published: December 2019

The evaluation of land reclamation suitability can predict the damaged land and it is of great significance in determining the best direction of land reclamation. Taking the abandoned land of Laojiao old town in Beipiao City as an example, this study selects the evaluation factors and establishes the evaluation index system based on the actual research situation. The evaluation results show that the drainage conditions in the project area are good, of which 36.6367hm2 is suitable for reclamation as cultivated land; 31.5327hm2 is suitable for reclamation as forest land.
Detection of mercuric ion in water environment based on luminescent metal–organic frameworks
Authors: Luo Yixun
Published: December 2019

Luminescent metal-organic framework (LMOF), as a class of metal-organic framework (MOF), is a novel class of porous material formed from metal ion and bridging organic ligands. Its unique structural and chemical properties have enabled us to reliably detect mercury ions, one of the most toxic contaminants in the environment. Additionally, the luminescence of LMOFs has made the detection process ever more convenient. In this paper, we pay attention on the change of luminescent intensity of these materials in the presence of Hg2+. We focus on several key publications in this area, including examples of LMOFs with excellent performance on Hg2+ detection, and we expect this review will provide new guidelines for Hg2+sensor engineering.
Effects of temperature on lignocellulosic wastes hydrolysis and volatile fatty acids accumulation under neutral and strongly alkaline conditions
Authors: Wang Xinze , Guo Wenrui , Wen Yue
Published: December 2019

The volatile fatty acids (VFAs) produced in the process of wetland plant litter (WPL) anaerobic digestion could be used as external carbon sources to enhance the removal efficiencies of oxidized contaminants in constructed wetlands. In this study, the effects of temperature on WPL hydrolysis and VFAs accumulation under neutral and strongly alkaline conditions were explored. In neutral (pH 7.0) fermentation, biotic factors were the leading reasons for WPL hydrolysis, and the maximal SCOD accumulation (2467 mg L-1) occurred at 35 °C with a fermentation time of 20 days. In strongly alkaline (pH 12.0) fermentation, abiotic factors were the leading reasons for WPL hydrolysis, and SCOD concentrations increased with temperature at a given fermentation time. Further investigation showed that biotic release of carbohydrate was more sensitive to temperature change than abiotic release. 25 °C was the optimal temperature for biotic release of carbohydrate, while abiotic release of carbohydrate slightly increased with temperature. From the results of linear regression, strong positive correlation was observed between VFAs production and the total release of carbohydrate. The optimal temperatures for VFAs accumulation under neutral and strongly alkaline conditions were respectively 35 and 25 °C, both with a fermentation time of 20 days, and the VFAs concentrations were respectively 1890.1 mg COD L-1 and 1276.4 mg COD L-1. VFAs produced in all fermentations consisted of acetic, propionic, iso-butyric, n-butyric, iso-valeric and n-valeric acids, with acetic acid being the most prevalent product. The fermentation broth fermented at 35 °C with a fermentation time of 20 days has the highest biological utilizability.
Influence Factors of Gas Extraction Effect and Residual Gas Content Distribution on Working Face
Authors: Hong Ding
Published: December 2019

The influence factors of gas extraction effect and residual gas content after bedding drainage on working face were uncertain, leading to the judge standard of gas extraction effect was not in conformity with the actual extraction situation. The influence zones of gas extraction were divided, according to the goaf and coal pillar of protective layer, including the tectonic belt of working face. The gas extraction parameters and residual gas content were tested, and the gas extraction effect and residual gas content distribution under different influence factors was studied by using Surfer software. The results showed that the concentrated stress under coal pillar made the gas extraction effect reduced greatly. Both the goaf and structural belt had relieving pressure effect on the C7+8 coal seam, but the gas extraction effect was better in the area dominated by the relieved pressure of goaf, while the gas extraction effect was worse in the area dominated by the relieved pressure of structural belt. From large to small, the residual gas content distribution in Area III was greater than that in Area II, greater than that in Area V, greater than that in Area I, greater than that in Area IV.
Rapid Detection of As(III) in Coal Gangue with Anodic Stripping Voltammetry Method
Authors: Wang Xiu-Teng , Xu Xiaowei , Lin Ling , Xu Ling , Huang Jin , Zhang Houhu , Dongfeng GAO , Fan Luoqi
Published: December 2019

It is important to detect arsenic content in the process of comprehensive utilization of coal gangue in view of environment risk control. In this work, we proposed a rapid detect method of As(III) in coal gangue with anodic stripping voltammetry, and optimized the operating parameters by a large number of experiments. The result shows that the anodic stripping voltammetry can accurately analyse As(III) in coal gangue in real time. Anodic stripping voltammetry method is suitable for small and medium-sized enterprises because of its short detection time and low cost of equipment.
First-principle calculation of stainless steel 304N used in concrete-filled steel tubular
Authors: Guo Yaqin , Liang Duoqiang , Deng Yong , Zheng Xuemei
Published: December 2019

Stainless steel 304N was calculated in the paper for the possible use in concrete-filled steel tubular. Calculation results show that compared with conventional 304 ferrite stainless steel, 304N adds alloy element niobium. Because Nb has strong effect of fixing carbon and nitrogen and refining ferrite grain size, 304N has very uniform and fine ferrite structure in annealing state, and carbonitride precipitates very little at grain boundary. Its corrosion resistance, formability, weldability and wrinkle resistance are better than ordinary 304.
Production Technology Requirement of Hong Kong Special Administrative Region on Prefabricated Segment
Authors: Lixu Cai
Published: December 2019

Prefabricated segmental beam bridge is widely adopted in city construction of Hong Kong, Macao and other developed regions with the advantages of product factory production, high quality control grade, excellent appearance quality, quick and convenient site installation, etc. Short line method prefabrication technology is finally selected, short line matching method technology principle and characteristics are combined for in-depth analysis and summary of template model selection, data monitoring, site casting process, etc. through comparative analysis based on the Hong Kong segmental beam prefabrication project contracted by Dongjiangkou Prefabrication Factory in the paper. Various effective measures are adopted to ensure the production efficiency and product quality of prefabricated parts.
Seismic behavior of the multistory steel-braced building with self-centering tension-only braces
Authors: Chi Pei , Tian Wenlong
Published: December 2019

Recent research has developed the self-centering tension-only brace (SC-TOB) that provides both seismic resilience and load mitigation to the structure. This study examined the seismic behavior of the SC-TOB frames (SC-TOBFs) through pushover and nonlinear dynamic analysis. The results indicate that the SC-TOBs can be designed to perform as conventional tension-only braces just offering required lateral stiffness to the structure under minor earthquakes and to function with excellent energy dissipation and recentering capabilities during significant earthquakes. The SC-TOBFs are capable of recentering both within 2% roof drift angle in pushover analysis and under the most severe hazard level in the dynamic analysis. The SC-TOBs are thereby deemed to be promising bracing members that have the potential to minimize the repair costs and operation disruption after earthquakes.
Hysteresis Performance Analysis of Damping Energy Dissipating Corrugated Steel Plate Shear Wall System
Authors: Zhang Xu , Peng Xiao-Tong , Yang Ao , Lin Chen
Published: December 2019

As a buckling-resistant component, the corrugated steel shear wall was adopted to restrain the local buckling of the steel plate. The mild steel damper was also added to improve the energy dissipation capacity of the structure, forming a new damping energy-dissipation corrugated steel plate shear wall system (DCSW). In order to study the hysteresis behaviour of DCSW, 5 nonlinear FEMs were established by ABAQUS, with the consideration of corrugated steel plate placement, mild steel dampers arrangement and openings form. Their ultimate bearing capacity, ductility, stiffness and energy dissipation performance were compared and evaluated. The results indicated that the DCSW system had better bearing capacity and energy dissipation capacity. The ultimate bearing capacity of structure with corrugated steel plate shear walls and mild steel dampers increased by 37%~43% and 11.4%~13% respectively, combining using those two elements, their ultimate bearing capacity increased by 52%~56%, and their ductility was also improved significantly.
Synthesis of polyacetone acrylamide and detection of amine benzene
Authors: Song Wenting , Mei Nanjie
Published: December 2019

A single homogeneous spherical polyacetone acrylamide particles was synthesized by inverse suspension polymerization. By adjusting the conditions of initiator, cross-linking agent, dispersant, water-oil ratio, reaction time and reaction temperature, the adsorbent material with large specific surface area and pore structure was obtained. Polyacetone acrylamide particles can effectively detect aniline by ultraviolet obsorption spectroscopy, the adsorption rate reaches 41.95% within 2 hours, and the adsorption reaches equilibrium within 5 hours, and the adsorption rate reaches 51.30%.
Electropolishing of Nitinol Wires and Its Influence on Corrosion Mechanisms
Authors: Lugovskoy Alex , Krovitsky Tatiana , Mor-Yossef Chen
Published: December 2019

Nitinol is a superelastic and shape-memory alloy often used for the production of vascular stents and surgery implants. Electrochemical polishing is normally used at the preparation stage of stent production. The Electropolishing treatment was performed in 1M Sulfuric acid in 75% Methanol and 25% Glycerine for several treatment times. The corrosion behaviours of Nitinol wires in Hanks’ Balanced Salts Solution and in 3% NaCl at room temperature before and after the treatment were compared. It was found that Nitinol is less active in Hank’s solution that in Sodium Chloride. Tafel slopes built to polarization curves indicate that the mechanisms of corrosion of Nitinol in Hanks’ solution and in NaCl are different. On the other hand, total corrosion current densities are similar in both kinds of media. Plausible equivalent circuits hint that the surface layers formed in Hanks’ solution are not the same as in NaCl. Specimens after the Electrochemical Polishing do not show any differences in the equivalent circuits either in Tafel slopes.
Effects of different Solanum rootstocks on biomass and cadmium content of Solanum melongena seedlings
Authors: Lu Ronghai , Li Liping , Li Hongyan , Lin Lijin , Pan Shaokun
Published: December 2019

The effects of Solanum melongena grafting with four different types of Solanum (Solanum diphyllum, Solanum nigrum, Solanum nigrum humile, Solanum alatum) on the biomass and cadmium content of S. melongena were studied by a pot experiment. The results showed that the effects of different treatments on root, rootstock stem, scion stem, scion leaves and whole scion biomass were all smaller than the ungrafted. The whole scion biomass of the treatment ungrafted were 2.67, 2.10, 4.50 and 3.49 times as much as the treatmensts S. melongena grafted with S. diphyllum, S. melongena grafted with S. nigrum, S. melongena grafted with S. nigrum humile, and S. melongena grafted with S. alatum. However, the effects of different treatments on the above indicators cadmium content trends were different. The cadmium content of root and rootstock stem of S. melongena grafted with S. nigrum humile were higher than control, but lower than other three treatments, but the cadmium content of scion stem, scion leaves and whole scion were lowest of all treatments. In conclusion, grafting will affect the growth and absorption of cadmium in S. melongena when it grafted with four different types of Solanum and on the whole, the trentment of S. melongena grafted with S. nigrum humile is the best.
The protection of the public ancestral temple in the south of Jiangnan—Yanlu public ancestral temple repair design, for example
Authors: Hu Yi nan , Wang Ying
Published: December 2019

Yanlu public ancestral temple is located in Longtan park, Guangzhou road, is to commemorate the great calligrapher of Yan Zhenqing public ancestral temple in the Tang dynasty, has a very high historical value and cultural value. In 2012, Nanjing decided to repair protect. Via present situation investigation and evaluation appraisal, discovered that Yanlu public ancestral temple overall building in good condition, Although there is some damage, it can continue to be used as long as a little repair. According to the site of damage make the feasible maintenance plan, make Yanlu public ancestral temple of the cultural life to rebirth.
Integrating BIM and IoT for smart bridge management
Authors: Zhao Zhenping , Gao Yu , Hu Xingyi , Zhou Yin , Zhao Lidu , Qin Guocheng , Guo Jieming , Liu Yachao , Yu Chenchen , Han Daguang
Published: December 2019

Considering high risk, long construction period, high construction and maintenance costs, bridge management is asynchronous, unintelligent and inefficient. The purpose of this research is to investigate a new approach with its supporting building information modelling (BIM) and Internet of Things (IoT) tool to enhance the smart management in bridge life cycle. BIM provides detailed geometric and semantic information and IoT contains the management and analysis of the actual condition of the bridge. An example of a super bridge under construction in Xinjiang is used to illustrate the developed system. Results show that the developed system can significantly grasp the quality of the bridge in time, reduce the construction risk and construction period. The developed BIM/IoT-based system is also effective and practical in the quality and risk management among multiple locations, such as smart buildings, smart tunnels, and even smart cities.
Design and Application of Automatic Monitoring System based on Total Station in Construction of Shield-bored Underneath Metro
Authors: Wei Yongbin , Zhao Wei
Published: December 2019

When metro shield passes through existing operating lines, it is necessary to carry out automatic monitoring of existing lines. Taking Changsha Metro Line 4 shield tunnelling through existing Metro Line 2 as an example, this paper carries out automatic deformation monitoring of existing Metro and judges the influence of shield tunnelling on existing Metro. According to the actual situation of the field, a whole set of automatic monitoring system is designed, and the detailed implementation plan is worked out. Finally, the deformation data are analysed, and the characteristics of the whole system are summarized.
Considering the Dynamic Response of Transverse and vertical Vehicle-bridge Coupled Curved Bridge
Authors: Pan Hong , Xu Hanzheng , Shang Pengpeng , Li Xiaotao
Published: December 2019

In order to explore the dynamic response of curved bridge under the coupling action of transverse and vertical vehicle-bridge, a three-span concrete continuous curve bridge model and a vehicle model are established by using the finite element software ANSYS. The coupling action of transverse and vertical vehicle-bridge is simulated by using the equilibrium and geometric coordination conditions of the forces between the two models, and the transversevibration of the vehicle model is considered. The dynamic response of curved bridge is studied by establishing the dynamic model of vehicle-bridge interaction. The results show that the maximum transverse force of 1# mid-span section increases by 1.43% under the action of 70t vehicle weight compared with that without considering the coupling effect of transverse and vertical vehicle-bridge; and the maximum transverse displacement of 1# mid-span section increases by 10.25% compared with that without considering the coupling effect of transverse and vertical vehicle-bridge. Therefore, it is necessary to take into account the vehicle-bridge coupling in the dynamic response analysis of curved bridges; the transverse displacement of curved bridges can be prevented by limiting load and weight.
An Integrated Sensing Architecture Used for Depth State Perception of High Voltage Circuit Breakers
Authors: Li Yujie , Zhao Ke , Ma Yong , Wang Jian , Liu Hua , Tang Ming
Published: December 2019

In order to strengthen the management of circuit breakers and sense its operation status at any time, condition-based maintenance has been carried out in power grids. Depending on the advanced condition monitoring and diagnosis technology, the abnormality of equipment can be judged and the failure of equipment can be predicted effectively. This paper discusses the state parameters need to be monitored for deep state sensing of high voltage circuit breakers. Monitoring parameters mainly include the current of opening/closing coils and energy storage motor coil, primary current and displacement of operating mechanism, respectively. And then, aiming at the complex installation environment of switch cabinet, a small integrated depth sensing node architecture is designed.
Application of BIM Technology in Construction Engineering
Authors: Qiu Shiyu , Xu Hao , Jin Ju , Zhang Hao , Sun Kai
Published: December 2019

The development of the construction industry has benefited from the ever-increasing demands of people for living conditions, both safe and comfortable. In order to complete the quality and quantity of the house, new technologies are continuously developed and used, such as the current BIM technology, which can be used well throughout the life cycle of the construction. This paper mainly analyses the use of BIM technology in construction engineering and explains the benefits of BIM technology in all walks of life.
Research on deceleration lane length of special ramp for freight cars on passenger-freight separation expressway
Authors: Li Bin , Yang Shaowei , Han Xueyan , Liang Hanmian
Published: December 2019

In order to obtain the truck-specific ramp deceleration lane length index for passenger and cargo separation, the UMRR chain Kepler radar speedometer is used to collect the vehicle speed data under the free-flow state of the ramp feature points (starting point, diversion point and small nose point of the transition section). The KS normal distribution test is carried out on the sample data. On the basis of satisfying the test requirements, the speed and acceleration characteristics of the deceleration lane vehicle are analysed, and then the parameters in the secondary deceleration theory are re-determined. Based on this, the deceleration lane length value of the truck-specific ramp is calculated.
Modelling strain softening of structured soils
Authors: Enyang Zhu , Wang Shaokun , Wang Yihe
Published: December 2019

Strain softening response of structured soil is more complicated than that of reconstituted soil. After comparatively introducing the unified hardening model for over-consolidated soil (UH model), and the unified hardening model for structured soil (structured UH model), the simulations of strain softening by the 2 models are analyzed from the visual angle of mathematic description. Comparisons between model simulations and test data of strain softening for different soils are illustrated at last, and the reasonability of model descriptions for different strain softening are verified.
Safety Discrimination of Expressway Plane and Vertical Alignment Combination Based on Grey Clustering Method
Authors: Zhao Yifei , Lei Xin
Published: December 2019

The combination design of plane and vertical alignment is one of the most important links in expressway alignment design, the quality directly affects the safety of corresponding sections. Therefore, it is of great practical significance to research the safety of plane and vertical alignment combination for expressway alignment design. Based on the collections of the plane and vertical alignment design data of the S26 Zhuji-Yongjia Expressway in Zhejiang Province and the historical data of the five-year traffic accidents, the paper uses the homogeneity method to divide the expressway alignment into the smallest unit modules. The grey clustering method is used to evaluate the safety of the plane and vertical alignment combination sections, and a discrimination model of the relationship between the plane and vertical alignment combination section and traffic safety is established. Combined with the severity of expressway traffic accidents, a method to judge the safety of different alignment combinations is given.
Comprehensive evaluation model of freeway traffic safety considering subjective and objective factors
Authors: Liu Xiao
Published: December 2019

In order to accurately evaluate the level of freeway traffic safety, this paper analyzed the characteristics of accidents on freeway and the factors affecting the freeway traffic safety, established an evaluation index system for freeway traffic safety, and constructed a comprehensive evaluation model based on hierarchical entropy and a comprehensive evaluation model based on vector similarity. The hierarchical entropy evaluation model used the analytic hierarchy process (AHP) and the entropy weight method to determine the subjective and objective weights of the evaluation indexes, the weighted average of the index data and the evaluation results. The vector similarity evaluation model used the vector similarity degree to analyze the traffic safety status of the freeway and conduct a comprehensive analysis.