bluuebunny/crossref_metadata_2025 huggingface dataset:
Experimental fortification of intestinal anastomoses with nanofibrous materials in a large animal model
Authors: Rosendorf Jachym , Horakova Jana , Klicova Marketa , Palek Richard , Cervenkova Lenka , Kural Tomas , Hosek Petr , Kriz Tomas , Tegl Vaclav , Moulisova Vladimira , Tonar Zbynek , Treska Vladislav , Lukas David , Liska Vaclav
Published: January 2020

Anastomotic leakage is a severe complication in gastrointestinal surgery. It is often a reason for reoperation together with intestinal passage blockage due to formation of peritoneal adhesions. Different materials as local prevention of these complications have been studied, none of which are nowadays routinely used in clinical practice. Nanofabrics created proved to promote healing with their structure similar to extracellular matrix. We decided to study their impact on anastomotic healing and formation of peritoneal adhesions. We performed an experiment on 24 piglets. We constructed 3 hand sutured end-to-end anastomoses on the small intestine of each pig. We covered the anastomoses with a sheet of polycaprolactone nanomaterial in the first experimental group, with a sheet of copolymer of polylactic acid with polycaprolactone in the second one and no fortifying material was used in the Control group. The animals were sacrificed after 3 weeks of observation. Clinical, biochemical and macroscopic signs of anastomotic leakage or intestinal obstruction were monitored, the quality of the scar tissue was assessed histologically, and a newly developed scoring system was employed to evaluate the presence of adhesions. The material is easy to manipulate with. There was no mortality or major morbidity in our groups. No statistical difference was found inbetween the groups in the matter of level of peritoneal adhesions or the quality of the anastomoses. We created a new adhesion scoring system. The material appears to be safe however needs to be studied further to prove itsʹ positive effects.
Defining the Environmental Adaptations of Genus Devosia: Insights into its Expansive Short Peptide Transport System and Positively Selected Genes
Authors: Talwar Chandni , Nagar Shekhar , Kumar Roshan , Scaria Joy , Lal Rup , Negi Ram Krishan
Published: January 2020

Devosia are well known for their dominance in soil habitats contaminated with various toxins and are best characterized for their bioremediation potential. In this study, we compared the genomes of 27 strains of Devosia with aim to understand their metabolic abilities. The analysis revealed their adaptive gene repertoire which was bared from 52% unique pan-gene content. A striking feature of all genomes was the abundance of oligo- and di-peptide permeases (oppABCDF and dppABCDF) with each genome harboring an average of 60.7 ± 19.1 and 36.5 ± 10.6 operon associated genes respectively. Apart from their primary role in nutrition, these permeases may help Devosia to sense environmental signals and in chemotaxis at stressed habitats. Through sequence similarity network analyses, we identified 29 Opp and 19 Dpp sequences that shared very little homology with any other sequence suggesting an expansive short peptidic transport system within Devosia. The substrate determining components of these permeases viz. OppA and DppA further displayed a large diversity that separated into 12 and 9 homologous clusters respectively in addition to large number of isolated nodes. We also dissected the genome scale positive evolution and found genes associated with growth (exopolyphosphatase, HesB_IscA_SufA family protein), detoxification (moeB, nifU-like domain protein, alpha/beta hydrolase), chemotaxis (cheB, luxR) and stress response (phoQ, uspA, luxR, sufE) were positively selected. The study highlights the genomic plasticity of the Devosia spp. for conferring adaptation, bioremediation and the potential to utilize a wide range of substrates. The widespread toxin-antitoxin loci and ‘open’ state of the pangenome provided evidence of plastic genomes and a much larger genetic repertoire of the genus which is yet uncovered.
Investigations of the Influences of Processing Conditions on the Properties of Spray Dried Chitosan-Tripolyphosphate Particles loaded with Theophylline
Authors: Wei Yang , Huang Yu-Hung , Cheng Kuo-Chung , Song Yu-Lin
Published: January 2020

The preparation of chitosan-tripolyphosphate (chitosan-TPP) particles by the spray drying had been reported word widely for a sustained release of drugs to prevent rapid drug metabolism. Although the spray drying is a straightforward procedure turning a liquid feed into a well-defined dry powder, seldom research works were focusing on how the processing parameters and liquid feeding constitutions of spray drying system might affect the properties of spray-dried chitosan particles loaded with drugs, such as the particle size and morphologies, which would be very important to drug encapsulation and dissolution of the drug delivery design. This study thus prepared the chitosan particles with theophylline (TH) loaded as a model drug and TPP as cross-linker at various spray drying conditions. Our results indicate the diameter of the TH/chitosan-TPP particles made by customized spray drying apparatus spans from 424 to 497 nm with a geometric standard deviation of less than 2. The corresponding release of TH was tunable by the chitosan-TPP matrix density under the selected spray drying temperature and the carrying air flow rate. These results suggest an indeed need for optimized spray drying processing conditions to make the ideal spray-dried TH/chitosan-TPP particles for the desired drug delivery.
Watching eyes do not stop dogs stealing food: evidence against a general risk-aversion hypothesis for the watching-eye effect
Authors: Neilands Patrick , Hassall Rebecca , Derks Frederique , Bastos Amalia P. M. , Taylor Alex H.
Published: January 2020

The presence of pictures of eyes reduces antisocial behaviour in humans. It has been suggested that this ‘watching-eye’ effect is the result of a uniquely human sensitivity to reputation-management cues. However, an alternative explanation is that humans are less likely to carry out risky behaviour in general when they feel like they are being watched. This risk-aversion hypothesis predicts that other animals should also show the watching-eye effect because many animals behave more cautiously when being observed. Dogs are an ideal species to test between these hypotheses because they behave in a risk-averse manner when being watched and attend specifically to eyes when assessing humans’ attentional states. Here, we examined if dogs were slower to steal food in the presence of pictures of eyes compared to flowers. Dogs showed no difference in the latency to steal food between the two conditions. This finding shows that dogs are not sensitive to watching-eyes and is not consistent with a risk-aversion hypothesis for the watching-eye effect.
Comprehensive Behavioral Intervention for Tics reduces perception-action binding during inhibitory control in Gilles de la Tourette syndrome
Authors: Petruo Vanessa , Bodmer Benjamin , Bluschke Annet , Münchau Alexander , Roessner Veit , Beste Christian
Published: January 2020

Gilles de la Tourette Syndrome (GTS) is a developmental disorder. Empirical studies and an emerging cognitive framework on GTS suggest that GTS is a disorder of abnormally strong ‘perception-action binding’. Theoretical considerations imply that the effectiveness of long-established behavioral interventions might be related to a normalization of increased binding in GTS. This has not been tested yet. We examined the effect of a standardized Comprehensive Behavior Intervention for Tics (CBIT) in N = 21 adolescent GTS patients and N = 21 healthy controls on perception-action binding in an inhibitory control paradigm. Prior to CBIT, GTS patients showed compromised performance compared to controls, specifically when inhibitory control was triggered by uni-modal visual compared to bi-modal stimuli. After CBIT intervention, GTS patient’s performance was at the same level as healthy controls. This is supported by a Bayesian data analysis. CBIT specifically affected inhibitory control in a condition where reconfigurations of perception-action bindings are necessary to perform inhibitory control. A power of 95% was evident for these effects. CBIT reduces increased ‘binding’ between perception and action in GTS and thereby increases the ability to perform response inhibition. The results are the first to provide insights as to why CBIT is effective by relating elements of this intervention to overarching cognitive theoretical frameworks on perception-action bindings.
Cobalt nanoparticles shielded in N-doped carbon nanotubes for high areal capacity Li–S batteries
Authors: Wei Lei , Li Wanlong , Zhao Teng , Zhang Nanxiang , Li Li , Wu Feng , Chen Renjie
Published: January 2020

The doped N species and embedded Co nanoparticles of Co-NCNTs have a synergistic effect on lithium polysulfide capture and conversion, leading to enhanced redox reaction kinetics.
A solvent-free strategy to realize the substitution of I− for IO3− in a BiOIO3 photocatalyst with an opposite charge transfer path
Authors: Xie Jing , Cao Yali , Hu Jindou , Tang Yakun , Jia Dianzeng
Published: January 2020

A photocatalyst was first synthesized by replacing IO3− with I− in BiOIO3via a simple solvent-free method and it exhibited excellent photocatalytic performance.
Enrichment of rare events using a multi-parameter high throughput microfluidic droplet sorter
Authors: Hung Sheng-Ting , Mukherjee Srijit , Jimenez Ralph
Published: January 2020

We developed a multi-parameter microfluidic platform to quantitatively analyze and enrich rare events on the basis of fluorescence lifetime and brightness by exploiting the Poisson distribution of analyte encapsulation into droplets.
Small molecule inhibitors in pancreatic cancer
Authors: Sun Jufeng , Russell Cecilia C. , Scarlett Christopher J. , McCluskey Adam
Published: January 2020

Pancreatic cancer (PC), with a 5-year survival of <7%, is one of the most fatal of all human cancers. There is an urgent need to develop more effective therapies to move beyond the current dire condition and paucity of PC treatment options.
A unique coordination-driven route for the precise nanoassembly of metal sulfides on metal–organic frameworks
Authors: Lin Xiang-Yu , Li Yue-Hua , Qi Ming-Yu , Tang Zi-Rong , Jiang Hai-Long , Xu Yi-Jun
Published: January 2020

A unique coordination-driven route for the precise nanoassembly of metal sulfides on metal–organic frameworks.
Pd nanoparticles stabilized with phosphine-functionalized porous ionic polymer for efficient catalytic hydrogenation of nitroarenes in water
Authors: Lei Yizhu , Chen Zaifei , Lan Guosong , Wang Renshu , Zhou Xiao-Yu
Published: January 2020

Small palladium nanoparticles stabilized with phosphine-functionalized PIP displayed high catalytic activity for nitroarenes hydrogenation. Nano-size Pd particles, electron-donation effect of phosphine ligand, and surface wettability account for its excellent catalytic performance.
Modeling of RAFT polymerization of MMA in supercritical carbon dioxide using the PC-SAFT equation of state
Authors: López-Domínguez Porfirio , Rivera-Peláez Jesús Eduardo , Jaramillo-Soto Gabriel , Barragán-Aroche José Fernando , Vivaldo-Lima Eduardo
Published: January 2020

The PC-SAFT equation of state was applied to the study of RAFT polymerization of methyl methacrylate in supercritical CO2.
Degradation of tetracycline in water using Fe3O4 nanospheres as Fenton-like catalysts: kinetics, mechanisms and pathways
Authors: Nie Mingxing , Li Yulian , He Junyong , Xie Chao , Wu Zijian , Sun Bai , Zhang Kaisheng , Kong Lingtao , Liu Jinhuai
Published: January 2020

The Fe3O4 nanospheres (Fe3O4-S) were controllably prepared for highly efficient degradation of tetracycline at neutral conditions.
Inhibition of hypoxia-inducible factor 1α accumulation by glyceryl trinitrate and cyclic guanosine monophosphate
Authors: Kim Judy , Barsoum Ivraym B. , Loh Harrison , Paré Jean-François , Siemens D. Robert , Graham Charles H.
Published: January 2020

A key mechanism mediating cellular adaptive responses to hypoxia involves the activity of hypoxia-inducible factor 1 (HIF-1), a transcription factor composed of HIF-1α, and HIF-1β subunits. The classical mechanism of regulation of HIF-1 activity involves destabilisation of HIF-1α via oxygen-dependent hydroxylation of proline residues and subsequent proteasomal degradation. Studies from our laboratory revealed that nitric oxide (NO)-mediated activation of cyclic guanosine monophosphate (cGMP) signalling inhibits the acquisition of hypoxia-induced malignant phenotypes in tumour cells. The present study aimed to elucidate a mechanism of HIF-1 regulation involving NO/cGMP signalling. Using human DU145 prostate cancer cells, we assessed the effect of the NO mimetic glyceryl trinitrate (GTN) and the cGMP analogue 8-Bromo-cGMP on hypoxic accumulation of HIF-1α. Concentrations of GTN known to primarily activate the NO/cGMP pathway (100 nM–1 µM) inhibited hypoxia-induced HIF-1α protein accumulation in a time-dependent manner. Incubation with 8-Bromo-cGMP (1 nM–10 µM) also attenuated HIF-1α accumulation, while levels of HIF-1α mRNA remained unaltered by exposure to GTN or 8-Bromo-cGMP. Furthermore, treatment of cells with the calpain (Ca2+-activated proteinase) inhibitor calpastatin attenuated the effects of GTN and 8-Bromo-cGMP on HIF-1α accumulation. However, since calpain activity was not affected by incubation of DU145 cells with various concentrations of GTN or 8-Bromo-cGMP (10 nM or 1 µM) under hypoxic or well-oxygenated conditions, it is unlikely that NO/cGMP signalling inhibits HIF-1α accumulation via regulation of calpain activity. These findings provide evidence for a role of NO/cGMP signalling in the regulation of HIF-1α, and hence HIF-1-mediated hypoxic responses, via a mechanism dependent on calpain.
NORAD accelerates chemo-resistance of non-small-cell lung cancer via targeting at miR-129-1-3p/SOX4 axis
Authors: Huang Qiang , Xing Shijiang , Peng Aiping , Yu Zhiwu
Published: January 2020

Substantial researches indicated that long non-coding RNAs (lncRNAs) exerted profound effects on chemo-resistance in cancer treatment. Nonetheless, the role of NORAD in non-small-cell lung cancer (NSCLC) remains unclear. In the present study, we chose NSCLC cell lines H446 and A549 to explore the function of non-coding RNA activated damage (NORAD) in response to cisplatin (DDP) resistance of NSCLC. Experimental data manifested that NORAD was up-regulated in DDP-resistant NSCLC tissues and cells. NSCLC patients with high NORAD expression suffered a poor prognosis. NORAD knockdown resensitized H446/DDP and A549/DDP to DDP. Besides, NORAD acted as a molecular sponge of miR-129-1-3p. MiR-129-1-3p showed a low level of expression in DDP-resistant NSCLC tissues. Moreover, miR-129-1-3p overexpression impaired DDP resistance in H446/DDP and A549/DDP cells. SOX4 was the downstream target of miR-129-1-3p. Especially, SOX4 overexpression offset the effects of NORAD silence on H446/DDP and A549/DDP cells resistance to DDP. NORAD knockdown resensitized H446/DDP and A549/DDP to DDP in NSCLC via targeting miR-129-1-3p/SOX4 axis, offering a brand-new target for NSCLC chemo-resistance.
Rationality analysis of urban spatial distribution and development direction based on environmental impact assessment——On to the Jianghua Yao nationality autonomous county
Authors: Li Zhe , Wang Yidan , Tong Shuyuan
Published: January 2020

The rational planning of urban spatial distribution and development direction could benefit the urban economy, social environment and other aspects, as an essential part of urban planning. Since the Law of EIA promulgated in 2003, the scope of environmental impact assessment has been upgraded to a higher level of overall urban planning whereas the influence is not significant. In 2018, urban and rural planning function was merged into the Ministry of Natural Resources, from leading urban construction to serving the protection of urban natural resources. It is also a new and significant approach to analyse the rationality of urban spatial distribution and development direction from the perspective of environmental impact assessment. The purpose of Jianghua Yao autonomous county is to build an eco-tourism civilized city, which is representative in the selection of cities for environmental impact assessment. On the space structure of functional areas and the development direction to the indicator elements of Yao nationality autonomous county class was divided into 4 categories, 5 layers,15 index factors were selected to construct the environmental impact assessment index system. Using analytic hierarchy process (AHP) to select the indexes weights assignment, then according to the evaluation criterion to evaluate it, we draws the analysis conclusion in the environment aspect. The planned urban spatial distribution and development direction of Jianghua Yao autonomous county from 2014 to 2020 are reasonable, have little negative impact on the environment, and are suitable for the green development of the city.
Spatio-temporal differentiation of sound environment in urban functional areas of China
Authors: Fuhong WANG , Jie LI
Published: January 2020

Urban acoustic environment, especially noise pollution, is a product of rapid urban development and urban scale expansion. It is one of the urgent environment problems in current urban planning and governance. This study analyzes the spatiotemporal changes of acoustic environment in the functional areas of cities above prefectural level based on the geographical perspective in China. The results shows that the higher urban level is, the more active acoustic environment in the functional areas will be; otherwise, the quieter it will be. The spatial variation of the acoustic environment in the functional areas in the east is generally higher than in the west, and the coastal areas is higher than interior during day and night, which is generally consistent with the spatial distribution characteristics of China's social and economic development. The influence factors of urban acoustic environment are multiple, the development of urban social economy has a significant influence on urban acoustic environment, and the factors like environmental protection consciousness of residents, environmental governance level of the city have a significant influence on urban acoustic environment. Therefore, the governance measures of urban acoustic environment should be more diversified.
Construction of Ecological Performance Evaluation Index for Rural Construction
Authors: Zhao Yang , Li Binghua
Published: January 2020

The construction of ecological performance evaluation index system of beautiful rural construction aims to promote the benign and high-quality development of rural ecological construction with the evaluation of rural ecological performance, and ultimately help to achieve the goal of regional "rural revitalization". Focusing on the ecological performance evaluation of rural construction in eastern Zhejiang Province, this paper screened and tested the evaluation indexes, and each index was given different weights based on the existing ecological performance evaluation index system combined with pre-selected evaluation indexes such as literature search and field research by means of expert consultation, questionnaire survey and analytic hierarchy process (AHP). The evaluation index system of ecological performance of beautiful rural construction was initially constructed with 2 first-class indexes, 11 secondclass indexes and 29 third-class indexes in order to improve the rural ecological space environment, enhance the rural ecological civilization, develop the quality of life of villagers, and promote rural revitalization.
Research on "Boundary Thickening" Strategy under the Protection and Renewal of the Old Urban District——Taking Yulin District of Chengdu as an Example
Authors: Lin Lu , Lingli Wu , Kunyang Li , Mengzhu Yang , Hui Yan , Fei Liu
Published: January 2020

The old urban district is the carrier of urban development, and its protection and renewal is of great significance for urban construction. This study with a view to protecting and renovating the old urban district by the boundary space design, taking Chengdu Yulin district as an example, proposing the "boundary thickening" strategy, and put forward the complete walking system, multiple public space, LID water purification corridor and compound functional wall four specific design measures, in order to enhance the space vitality of the entire district through the transformation design of the boundary space. It will help the protection and renewal of the old urban district, and provide some reference for the design of the same type of block boundary space in the future.
Landscape Evaluation of Rural and Small Towns in Siming Mountain of Zhejiang Based on Landscape Performance
Authors: Yang Miao , Zhao Yang , Zhao Tiezheng
Published: January 2020

With the advancement of China's urbanization process, China's villages and small towns also begin to face a series of challenges such as ecological environment destruction, population outflow and aging. In order to better deal with these challenges, Zhejiang province issued the “Interim Measures for the Assessment and Acceptance of Environmental Comprehensive Improvement Actions in Small Towns in Zhejiang Province”. The document provides detailed environmental assessments of villages and small towns, but lacks economic and social assessments. This study introduced the performance evaluation system of landscape, it focuses on the sustainable development of the thought and the advantage of quantitative evaluation system, combined with“Interim Measures for the Assessment and Acceptance of Environmental Comprehensive Improvement Actions in Small Towns in Zhejiang Province”, to build a strong comprehensive evaluation index system. Then, the analytic hierarchy process (AHP) and fuzzy comprehensive evaluation method (FCE) are used to draw the conclusion. In this way, the direction of key construction in the next step of rural and small town development can be clarified to achieve better development of this region.
Analysis on the Coupling Relationship between Urbanization and Regional Ecological Security and Empirical Analysis
Authors: Wu Yanxia , Chen Buyu , Li Fangfei
Published: January 2020

With the acceleration of urbanization, regional ecological security issues have become increasingly prominent. There is a complex relationship between urbanization and urban ecological security. This paper uses the method of system analysis to qualitatively describe the coupling relationship between urbanization system and urban regional ecological security system, and quantitatively evaluate the coupling and coordination relationship between these two systems. The results show that the spatial urbanization subsystem is the most driven to the urbanization system, and the ecological security response system is an important factor to maintain and enhance the urban ecological security. Therefore, the spatial urbanization subsystem and the ecological security response subsystem have the greatest influence on the coupled system between urbanization and urban ecological security. Taking Shaanxi Province as an example, it is analyzed that the coordination degree between Shaanxi's urbanization system and regional ecological security system is increasing from 2005 to 2016, and has experienced four stages : uncoordinated recession, low coordination, moderate coordination and high coordination. The coordination degree between urbanization development and urban ecological security has been continuously improved, indicating that urbanization development has a positive role in promoting urban ecological security.
Development Problems and Countermeasures of Characteristic Towns in Liaoning Province
Authors: Ha Jing , Wang Ze
Published: January 2020

This paper discusses the establishment and construction of characteristic towns at all levels in Liaoning Province, including 13 national characteristic towns, 20 provincial characteristic villages and towns and 11 industrial characteristic towns, and then analyzed the problems and obstacles encountered in the construction of these towns, puts forward some suggestions and strategies to solve these problems, in order to provide some reference for the construction of characteristic towns in Liaoning Province.
Noise Insulation Renovation of Rail Transit Existing On-Ground Lines
Authors: Liu Lei , Yao Kun , Wu Liyan , Zhang Meng
Published: January 2020

Taking the noise insulation renovation project of two existing on-ground lines in a city of China as an example, this article introduces a renovation scheme and noise test results before and after renovation in detail. Based on the noise test results pre-renovation, the decision has been made to adopt the scheme of adding fully-enclosed noise barriers for noise reduction. Aligning with the status quo and construction characteristics of the Project, a reasonable renovation design scheme and construction scheme have been selected through comparison, and effective construction protection measures have been taken. This article is significant referential literature for noise insulation renovation for existing rail transit on-ground lines.
Seismic performance of double skin semi-base-isolated structures
Authors: Fang Congqi , Dong Wenyan , Parsaeimaram Mohammad
Published: January 2020

Base isolation technology is a popular and powerful isolation technology. This technique can greatly reduce the seismic response of the structure, so as to reduce the damage to the structure. Base isolation method decouples the superstructure from the base by installing a flexible layer under each column to reduce dynamic response in the earthquake and elongate the time period of structures due to its inherent flexibility. However, the long time period causes large displacement. In addition, base isolation devices are highly vulnerable due to uplift forces produced by lateral force resisting systems (LFRS). In this study, an adjustable structure with a new configuration, namely double skin semi-base-isolated (SBI) structure is presented to solve the above problems. The LFRS is omitted in the proposed SBI structure and the time period and displacement are reduced compared to the conventional base-isolated structure. The forcedeformation behavior of an isolator is modeled as bi-linear hysteretic behavior which can be effectively used to model all isolation system in practice. This study investigates the seismic performance of 10-story double skin SBI reinforced concrete (RC) structure under far-fault earthquake ground motion by numerical method. Results demonstrate that the SBI system is significantly adjustable with the use of RC coupling beams between the inner core and outer frames. By increasing or reducing the number of connected floors in the SBI system, dynamic behaviors of the SBI system can be changed. The adjusted structure can be created by adding and removing RC coupling beams at every arbitrary floor level.
Research on Railway Freight Volume Prediction Based on Neural Network
Authors: Yang Can , Li Xuemei
Published: January 2020

Railway freight volume is an important part of the total social freight volume and an important indicator of the national economy. Scientific prediction of railway freight volume can provide decision support for the formulation of China's railway policy and railway investment planning, and is of great significance for adjusting transportation structure and building an efficient transportation network. In order to improve the prediction accuracy, this paper constructs a combined prediction model based on GRA-GABP. The model uses grey correlation analysis to screen out the key influencing factors of railway freight volume, and optimizes the weight and threshold of BP neural network based on genetic algorithm to improve the prediction accuracy. This paper comprehensively considers the influencing factors of macroeconomics, market demand, logistics competition and railway supply. The historical data of railway freight transport from 1978 to 2018 is selected for case analysis. The results show that the prediction accuracy of the GRA-GA-BP based combination prediction model is significantly improved and can be used as an effective tool for railway freight volume forecasting.
Remote sensing inversion of lake water quality parameters based on ensemble modelling
Authors: Xiaojuan Li , Mutao Huang , Jianbao Li
Published: January 2020

In this paper, combined with water quality sampling data and Landsat8 satellite remote sensing image data, the inversion model of Chl-a and TN water quality parameter concentration was constructed based on machine learning algorithm. After the verification and evaluation of the inversion results of the test samples, Chl-a TN inversion model with high correlation between model test results and measured data was selected to participate in remote sensing inversion ensemble modelling of water quality parameters. Then, the ensemble remote sensing inversion model of water quality parameters was established based on entropy weight method and error analysis. By applying the idea of ensemble modelling to remote sensing inversion of water quality parameters, the advantages of different models can be integrated and the precision of water quality parameters inversion can be improved. Through the evaluation and comparative analysis of the model results, the entropy weight method can improve the inversion accuracy to some extent, but the improvement space is limited. In the verification of the two methods of ensemble modelling based on error analysis, compared with the optimal results of a single model, the determination coefficient (R2) of Chlorophyll a and TN concentration inversion results was increased from 0.9288 to 0.9313 and from 0.8339 to 0.8838, and the root mean square error was decreased from 14.2615 μ/L to 10.4194 μ/L and from1.1002mg/L to 0.8621mg/L. At the same time, with the increase of the number of models involved in the set modelling, the inversion accuracy is higher.
Decontamination Efficiency of Phenylamine using Foam coupled Acidic Spray
Authors: Shouzhong Wang , Zhen Zhou , Tong Zhang , Xiaojun Fang , Chaoyang Miao
Published: January 2020

A sudden leak of phenylamine is an urgent environmental issue due to its liquidity and volatility. To overcome this difficulty, the decontamination efficiency of spray, foam, and activated carbon to phenylamine was explored using simulated leak box. Furthermore, a new decontamination method of foam coupling with acidic spray was proposed to decontaminate phenylamine. Its decontamination efficiency for phenylamine gas was up to 90% after 3 min adsorption at 3:1 mass ratio and phenylamine liquid was solidified quickly.
Evaluation and Simulation on the Reserve Capacity of Thermal Storage Electric Boiler Clusters
Authors: Cai Linjun , Zhang Zheng , Xie Dongliang , Song Xiaofang , Lai Yening
Published: January 2020

After providing a better service for nearby heating loads, a thermal storage electric boiler system can use the heat storage tank to participate in the peak-shaving and reserve services of the power grid. Current researches focus on its peak-shaving capacity, but ignores the use of its reserve capacity, which is important to the random fluctuations of renewable energy sources. Facing the actual analyzing demands on power system adequacy, this paper starts with the discussion of typical operation modes, and builds the powersystem- adequacy model of a thermal-storage electric boiler based heating system. Based on the presented model, the concept of feasible domain for heat charging and discharging is proposed. By implementing the concept, the quantitative evaluation method to calculate the reserve capacity of a thermal storage electric boiler system is proposed. The verification of the method is also given. Based on the planning data of an actual power grid, the short-term reserve capacity as well as the effect on promoting renewable energy consumption is estimated according to the given size of the provincial thermal storage electric boiler clusters. Finally, the influences of different choices of peak-shaving strategies, heat storage tank capacity on its reserve capacity are simulated and analyzed.
Application Challenges and Prospects of Urban Integrated Energy System Planning
Authors: He Guoxin , Yang Zhihong , Zhu Jinda , Wang Qi , Yang Dongmei , Chen Yonghua , Du Wei
Published: January 2020

The integrated energy system is the main physical carrier of the energy Internet. Planning is the leading link of its application, which directly affects the necessity and economy of the construction of the project. Firstly, the basic process of integrated energy planning is summarized. Then, three application challenges faced by urban integrated energy system planning are summarized from the perspective of engineering application: integrated energy system refinement modelling, multi-energy load integrated prediction, and expansion of planning boundaries. The corresponding strategies are given for the above challenges, and the development of integrated energy system planning and application is prospected, which provides reference for the staff engaged in urban integrated energy system planning and related investors.
Research on Source-Network Coordination Voltage Control Strategy of Photovoltaic Power Plant Considering the Stability of Inverter Port Voltage
Authors: Ma Jinhui , Ye Haifeng , Li Zhi , Han Pingping , Lin Zihao , Shi Jianxiong
Published: January 2020

At present, the reactive power distribution method considering the reactive power adjustment capacity of the inverter in the photovoltaic (PV) power plant will lead to the output voltage of the inverter exceeding the limit. In particular, the PV inverter adopts the constant reactive power control to support the voltage at point of common coupling (PCC), which has a good effect in the steady-state operation. However, when the system is subject to transient disturbance, the PV inverter cannot flexibly support the voltage level of the system by changing the reactive power output. Therefore, this paper proposes a source-network coordination control strategy aiming at the stability of bus voltage at PCC and inverter port voltage. Firstly, the paper introduced the advantages of constant voltage control of PV inverter. Then, the voltage and reactive power control objectives of the PV Inverter in the PV power plant were calculated by considering the PCC voltage, tie lines, power collection lines, the power of transformers and the voltage loss to realize the voltage and reactive power balance control between the inverters. Finally, an actual PV power plant simulation model was built to analyse the PCC voltage under the two conditions of PV output fluctuation and system fault to verify the effectiveness of the control strategy proposed in this paper. The proposed strategy has engineering application value for the realization of closed-loop voltage control between the power grid and PV power plant and the improvement of the active response ability to the PCC voltage.
Study on phytoremediation for heavy metal contaminated sediments by hydrophytes
Authors: Ma Tao , Zhang Wenhui , Fan Hongkai , Huang Lizhu , Xu Qing , Ma Guangxiang , Zhou Guofeng , Meng Yingjie , Sun Jianzhang , Qiu Jinwei , Gu Junjie , Kang Xingsheng
Published: January 2020

The remediation performances of heavy metals contaminaged sediment by hydrophytes including Alternanthera Philoxeroides, Canna indica L., Nymphaea tetragona, Typha orientalis, Phragmites australis, Phragmites australis, Hydrilla verticillata, Cyperus alternifolius L., Eichhornia crassipes, Acorus tatarinowii, Digitaria sanguinalis (L.) Scop were investigated through batch pot experiments. The results showed that the enrichment effect of Pb was better in Alternanthera Philoxeroides and Acorus tatarinowii with the BCFs of 4.42 and 1.22, and the TFs of 7.84 and 4.23, respectively. The Cr enrichment effects by Nymphaea tetragona, Hydrilla verticillata and Eichhornia crassipes (Mart.) Solms were better, which BCFs were 2.69, 1.91 and 3.71, and which TFs were 7.93, 2.07 and 2.18, respectively.
Study on greenhouse soil nitrogen absorption and soil layer transport of different summer catch crops with different planting density in North China
Authors: Zhiqiang Pei , Shuchang Lu , Xi Wang , Kun Hou , Zongjie Ya , Yu Zhang , Dafeng Wang , Xiawen Li
Published: January 2020

In order to improve the utilization rate of nitrogen fertilizer and reduce the environmental pollution risk of the nitrogen accumulation in the vegetable field, this study was carried out in the summer leisure period of the greenhouse vegetable production. This experiment designed different planting density treatments in 2017 and 2018, i.e. for catch waxy corn, 3300 plants/667m2 (WCD1), 5000 plants/667m2 (WCD2), 6600 plants/667m2 (WCD3), for forage sweet sorghum, 4500 plants /667m2 (FSS4), 7000 plants/667m2 (FSS5), 9000 plants/667m2 (FSS6) in 2017; and for catch waxy corn, 4500 plants/667m2 (WCDI), 7000 plants/667m2 (WCDII), 9000 plants/667m2(WCDIII), for forage sweet sorghum, 7000 plants/667m2 (FSSIV), 10000 plants/667m2 (FSSV), 14000 plants/667m2 (FSSVI) in 2018. The results showed that the biomass and nitrogen absorption of the two catch crops began to improve and then decreased with the increase of planting density. The nitrogen absorption amount of the catch waxy corn and forage sweet sorghum was 22.36~28.68 kg/667m2,21.67~24.39 kg/667m2, respectively. Different planting density of catch waxy corn and forage sweet sorghum could significantly reduce the total nitrogen content of 0~30cm soil layer and the nitrate nitrogen content of 0~90cm soil layer, for catch waxy corn and forage sweet sorghum, the reduction rate of total nitrogen content in 0~30cm soil layer was 9.6%~27.0%, 5.7%~23.5%, the reduction rate of nitrate nitrogen content reached 50.0%~90.8%, 80.1%~96.4%, respectively, which effectively controlled the nitrate nitrogen leaching to soil deep layer. Planting catch crops could increase soil urease activity, regulate soil nitrogen transformation. Compared with other treatments, WCDII and FSSV treatment can reduce the initial urease activity and soil nitrate nitrogen content of next crops, which is consistent with the nutrient requirements of broccoli in the early stage of growth. These catch crops planting could reduce the nitrogen environmental risk in the greenhouse soil. Finally, the study proposed that the suitable planting density of catch waxy corn and forage sweet sorghum planted was 6600~7000 plants/667m2, and 9000~10000 plants/667m2, respectively, in the greenhouse summer leisure period. It is more advantageous to improve soil nitrogen absorption and reduce soil nitrogen environmental risks for catch waxy corn.
Effects of Soil Conditioners on Absorption of phosphorus by waxy corn and Phosphorus Transformation in High Phosphorus Soils
Authors: Xi Wang , Shuchang Lu , Zhiqiang Pei , Kun Hou , Zongjie Ya , Yu Zhang , Dafeng Wang , Xiawen Li
Published: January 2020

In this experiment, the effects of different types of conditioners and their application on the absorption and transformation of phosphorus in high phosphorus soils in facilities were investigated to improve the environmental problems of protected farmland caused by phosphorus accumulation. Waxy corn was used as a test crop, and five conditioners such as humic acid, biochar, bentonite, alum, and dephosphorized gypsum were used as test materials for potting experiments. The experiment set 10 treatments, namely T1(Blank control), T2(Humic acid), T3(Biochar), T4(Bentonite), T5(Alum), T6 (Dephosphorized gypsum), T7(Biochar-bentonite-alum), T8(Humic acid-biochar-alum),T9(Humic acidbiochar- bentonite-alum),T10(Humic acid-bentonite-biochar-alum-dephosphorized gypsum). Based on the analysis of the results of the three crops, except that the first crop was not significant, the biomass and phosphorus absorption of waxy corn of T2 was the highest in the second crop, and T10 was the most effective treatment in the third crop. The soil available phosphorus content of T8 was the lowest in the second crop and that of T10 was the lowest in the third crop, which were 12.01% and 12.75% lower than the control. The soil water-soluble phosphorus content of T4 was the lowest in the second crop, which was 41.84% lower than the control, and that of T8 was the lowest in the third crop, which was 26.62% lower than the control. According to the results of the three crops, the ratio of the total phosphorus content of the inorganic phosphorus in the third crop of each treatment was increasing compared with the first crop. The soil phosphorus was transformed from organic phosphorus to inorganic phosphorus. The ratio of total phosphorus content of organic phosphorus of T6, T9, T10 was larger than other treatments, which slowed down the conversion of phosphorus to available form. The ratio of Ca8-P in the inorganic phosphorus was the highest, reaching about 50% to 60%. From the results and analysis, T2 and T10 were beneficial to the absorption of soil phosphorus by waxy corn, T8 and T10 were beneficial to slow down the conversion of phosphorus to the effective state, reduce the potential risk of phosphorus environment, improve the phosphorus accumulation environmental issues in greenhouse farmland.
Application and performance evaluation of desulfurization wastewater spray drying technology
Authors: Shanshan Zhang , Renlei Wang , Guorui Tang , YU Dai
Published: January 2020

In order to realize zero discharge of desulfurization wastewater, spray drying technology of desulfurization wastewater was used in 2x330MW unit of a power plant. Its principle was to use a rotary atomizer for atomization,and a part of hot flue gas was drawn from the SCR denitrification reactor and air preheater into the drying tower, the heat was used to evaporate the desulfurization wastewater in a spray drying tower. The salt in the waste water was mixed with the dust, which was collected and removed by the electric dust remover. Then the water vapor was mixed with the flue gas and finally enters the desulfurization tower.The field test was carried out under the condition that the unit load was 100% and the amount of desulfurization wastewater treated was 5.1m3/h.The results showed that the hot smoke gas volume of drying tower was about 64896m3/h, The smoke temperature at the inlet and outlet of the drying tower were 335℃ and 205℃ respectively,the moisture content of drying products was only 0.05%. The content of HCl in the flue gas at the inlet and outlet of the drying tower were 55mg/L and 195mg/L respectively, the mass fractions of Cl removal and Cl volatilization in desulfurization wastewater were 87.7% and 12.3% respectively. The increase of Cl content in the dried products had little effect on the utilization of fly ash.
Evaluation of effects of rumen fluid in combination with probiotic preparations and vanillin on the luminescence of a recombinant strain E. coli
Authors: Karimov Il'shat , Kondrashova Kristina , Duskaev Galimzhan , Kvan Olga
Published: January 2020

A way to assess the metabolic state of bacteria of rumen microflora cells is the registration of glow kinetics including recombinant strains, which is a reflection of stress states developing in the cell. The experiment evaluated the effect of rumen fluid in combination with probiotic strains and vanillin on the luminescence of a recombinant strain Escherichia coli MG1655 and digestibility of feed. The “in vitro” method with the rumen simulation technique (Rusitec) was used to determine the digestibility of the dry substance of feed. Using the initial sample, the glow level at the 30th minute was recorded at 3,149±145 RLU, which is 32% of the control level. In the presence of rumen fluid (at the concentration of 6.25%), there was observed an improved response by E.coli against Saccharomyces boulardii’s background (by 44%). The use of vanillin in rumen fluid increases the glow level of bacterial cells in the range of concentrations up to 50%, and in combination with probiotic strains, in the range of 25-50 %. In vitro conditions against the background of rumen fluid showed that vanillin in combination with probiotic strains Bifidobacterium longum and Bifidobacterium adolescentis / Lactobacillus acidophilus contributes to an increase in the digestibility of the dry substance of feed.
Progress in Research and Application of Natural Polymer Coagulants
Authors: Yu Xiao , Fu Ying
Published: January 2020

In recent years, natural polymer coagulant has become a hot spot in the field of coagulants due to its safety, harmlessness and biodegradability. This paper introduced the status quo of research of natural polymer coagulants such as starch, chitosan, cellulose and lignin coagulants. And some hot applications in water treatment were discussed, such as heavy metal wastewater, dye wastewater, microalgae collection and sludge dewatering. Finally, the development trend of natural polymer coagulants was prospected.
Research and Application of New Condensing Extraction Backpressure heating technology of 330 MW unit
Authors: Tang Shufang , Tang Guoan , He Xiaohong , Zheng Lijun , Yu Cong , Xu Haipeng
Published: January 2020

This paper introduces the retrofit scheme of the New Condensing Extraction Backpressure heating technology, and the technology is recommend for use by comparing and analysing the combined heat and power system based on a 330MW unit retrofit. After improvement, the heating capacity has been Obvious improved, the generation power has been greatly reduced and the capacity of peak load regulation has been significantly improved, which can not only realize the thermoelectric decoupling, but also obtain the remarkable economic benefit.
Preliminary results on the instrumental polarization of NIKA2-Pol at the IRAM 30m telescope
Authors: Ajeddig H. , Adam R. , Ade P. , André Ph. , Andrianasolo A. , Aussel H. , Beelen A. , Benoît A. , Bideaud A. , Bourrion O. , Calvo M. , Catalano A. , Comis B. , De Petris M. , Désert F.-X. , Doyle S. , Driessen E.F.C. , Gomez A. , Goupy J. , Kéruzoré F. , Kramer C. , Ladjelate B. , Lagache G. , Leclercq S. , Lestrade J.-F. , Macías-Pérez J.F. , Maury A. , Mauskopf P. , Mayet F. , Monfardini A. , Perotto L. , Pisano G. , Ponthieu N. , Revéret V. , Ritacco A. , Romero C. , Roussel H. , Ruppin F. , Schuster K. , Shimajiri Y. , Shu S. , Sievers A. , Tucker C. , Zylka R.
Published: January 2020

Clarifying the role of magnetic fields in the star formation process is crucial. Observations have already shown that magnetic fields play an important role in the early stages of star formation. The high spatial resolution (∼0.01 to 0.05 pc) provided by NIKA2-Pol 1.2 mm imaging polarimetry of nearby clouds will help us clarify the geometry of the B-field within dense cores and molecular filaments as part of the IRAM 30m large program B-FUN. There are numerous challenging issues in the validation of NIKA2-Pol such as the calibration of instrumental polarization. The commissioning phase of NIKA2-Pol is underway and is helping us characterize the intensity-to-polarization “leakage” pattern of the instrument. We present a preliminary analysis of the leakage pattern and its dependence with elevation. We also present the current leakage correction made possible by the NIKA2 pipeline in polarization mode based on the NIKA2-Pol commissioning data taken in December 2018. Based on reduced Stokes I, Q, U data we find that the leakage pattern of NIKA2-Pol depends on elevation and is sensitive to the focus of the telescope.