bluuebunny/crossref_metadata_2025 huggingface dataset:
Uptake of perfluorinated alkyl acids by crops: results from a field study
Authors: Felizeter Sebastian , Jürling Heinrich , Kotthoff Matthias , De Voogt Pim , McLachlan Michael S.
Published: July 2021

Variability of plant uptake of PFAAs from soil is explored with measured uptake factors for 13 PFAAs in 4 crops.
CO2-Driven diffusiophoresis and water cleaning: similarity solutions for predicting the exclusion zone in a channel flow
Authors: Shim Suin , Baskaran Mrudhula , Thai Ethan H. , Stone Howard A.
Published: July 2021

We study diffusiophoretic exclusion zone (EZ) formation in rectangular channel flow, driven by CO2 dissolution from one side wall. By using a similarity transform and considering the flow structure, we obtain the relation between EZ and the wall shear rate.
An investigation into the origin of variations in photovoltaic performance using D–D–π–A and D–A–π–A triphenylimidazole dyes with a copper electrolyte
Authors: Siva Gangadhar Palivela , Jagadeesh Anooja , George Andrew Simon , Reddy Govind , Prasanthkumar Seelam , Soman Suraj , Giribabu Lingamallu
Published: July 2021

The potential of using non-planar triphenylimidazole-donor-based dyes in dye-sensitized solar cells was explored via synthesizing two novel dyes, LG-P1 and LG-P3, with D–D–π–A and D–A–π–A architectures, respectively.
Production of novel carbon nanostructures by electrochemical reduction of polychlorinated organic rings under mild conditions for supercapacitors
Authors: Kudaş Züleyha , Çepni Emir , Gür Emre , Ekinci Duygu
Published: July 2021

Here, new carbon-based nanostructures were prepared via a one-step electrochemical method using hexagonal and pentagonal polychlorinated organic rings as the carbon source.
Discrimination of enantiomers of amides with two stereogenic centers enabled by chiral bisthiourea derivatives using 1H NMR spectroscopy
Authors: Zhang Hanchang , Zhao Hongmei , Wen Jie , Zhang Zhanbin , Stavropoulos Pericles , Li Yanlin , Ai Lin , Zhang Jiaxin
Published: July 2021

Enantiomers of amides with two stereogenic centers have been effectively discriminated in the presence of chiral bisthiourea derivatives as chiral solvating agents by 1H NMR spectroscopy.
Trifluoroethanol-promoted ring-opening cyclization of 4-(2-oxiranylmethoxy)indoles: access to 4,5-fused indoles
Authors: Das Jonali , Das Sajal Kumar
Published: July 2021

Pyrano[2,3-e]indol-3-ols and oxepino[4,3,2-cd]indol-3-ols, have been synthesizedviatrifluoroethanol-mediatedendo-selective ring-opening cyclization of 4-(2-oxiranylmethoxy)indoles.
Diastereoselective synthesis of indolenine-based spiro[pyrazolone-4,2′-pyrrolidine] scaffolds via 1,3-dipolar cycloaddition of 4-aminopyrazolones, aldehydes, and indolenines
Authors: Nawaz Shah , Wei Shiqiang , Huang Yue , Wang Wenyao , Qu Jingping , Wang Baomin
Published: July 2021

A one-pot [3 + 2] cycloaddition of in situ generated azomethine ylides derived from 4-aminopyrazolones with indolenines and aldehydes is developed to access spiro[pyrazolone-pyrrolidine] scaffolds.
Hierarchical C/Co3O4 nanoarray on a nickel substrate integrating electromagnetic and thermal shielding
Authors: Shu Jin-Cheng , Zhu Si-Qi , Cao Wen-Qiang , Cao Mao-Sheng
Published: July 2021

A hierarchical C/Co3O4 nanoarray integrating excellent electromagnetic and thermal shielding performance can be used to assemble wearable devices to protect human beings from electromagnetic and thermal radiation.
Indoleninyl-substituted pyrimido[1,2-b]indazoles via a facile condensation reaction
Authors: Ramle Abdul Qaiyum , Fei Chee Chin , Tiekink Edward R. T. , Basirun Wan Jefrey
Published: July 2021

A facile synthesis of fused nitrogen tricyclic based pyrimido[1,2-b]indazoles featuring indolenines is presented.
Metal-free thermal organocatalytic pinacol coupling of arylaldehydes using an isonicotinate catalyst with bis(pinacolato)diboron
Authors: Yasui Masamichi , Hanaya Kengo , Sugai Takeshi , Higashibayashi Shuhei
Published: July 2021

The metal and light-free thermal organocatalytic pinacol coupling of arylaldehydes has been developed.
Fluorescent labeling and characterization of dicarboxylic cellulose nanocrystals prepared by sequential periodate–chlorite oxidation
Authors: Sun Xiaozheng , Xue Yanhua , Li Jianye , Yang Yu , Bai Yu , Chen Yujia
Published: July 2021

A new method to synthesize fluorescent cellulose nanocrystals (FCNC) using 7-amino-4-methylcoumarin (AMC) and dicarboxylic cellulose nanocrystals (CNC), prepared by sequential periodate–chlorite oxidation.
Directed Markovnikov hydroarylation and hydroalkenylation of alkenes under nickel catalysis
Authors: Li Zi-Qi , Apolinar Omar , Deng Ruohan , Engle Keary M.
Published: July 2021

Native Lewis basic functional groups enable the nickel-catalyzed Markovnikov-selective hydroarylation and hydroalkenylation of unactivated alkenes with organoboron reagents.
Production of biofuel precursor molecules (monocarboxylic acids, biohydrogen) from apple and pumpkin waste through an anaerobic fermentation process
Authors: Reddy M. Venkateswar , Chang Young-Cheol
Published: July 2021

Medium-chain fatty acids (MCFA) such as caproic, heptanoic, and caprylic acids are monocarboxylic acids, which can be used as precursor molecules to synthesize biodiesel, bioplastics, antimicrobials, and corrosion inhibitors.
Data-driven algorithms for inverse design of polymers
Authors: Sattari Kianoosh , Xie Yunchao , Lin Jian
Published: July 2021

The ever-increasing demand for novel polymers with superior properties requires a deeper understanding and exploration of the chemical space.
Recent advances in effective capture of inorganic mercury from aqueous solutions through sulfurized 2D-material-based adsorbents
Authors: Subbaiah Muthu Prabhu , Kalimuthu Pandi , Jung Jinho , Jeon Byong-Hun
Published: July 2021

This review critically summerizes the importance of the 2D based materials (graphene, MoS2, MOFs and LDH) towards mercury adsorption, synthetic methods, re-usabilities, and real-water analysis of the developed materials.
High-temperature piezoelectric conversion using thermally stabilized electrospun polyacrylonitrile membranes
Authors: Wang Wenyu , Zheng Yide , Sun Yue , Jin Xin , Niu Jiarong , Cheng Maoyun , Wang Hongxia , Shao Hao , Lin Tong
Published: July 2021

Electrospun polyacrylonitrile nanofiber membranes show high flexibility and excellent piezoelectric properties after thermal stabilization and can be used to harvest energy in a broad temperature range from room temperature to 550 °C.
Calcium phosphate bone cement with enhanced physicochemical properties via in situ formation of an interpenetrating network
Authors: Ding Luguang , Wang Huan , Zhang Weidong , Li Jiaying , Liu Dachuan , Han Fengxuan , Chen Song , Li Bin
Published: July 2021

Calcium phosphate cement with enhanced washout resistance and mechanical properties has been developed by the in situ crosslinking of glycidyl methacrylate modified γ-polyglutamic acid within the cement matrix, forming an interpenetrating network.
Different approaches to synthesising cerium oxide nanoparticles and their corresponding physical characteristics, and ROS scavenging and anti-inflammatory capabilities
Authors: Wu Yuao , Ta Hang T.
Published: July 2021

This review focuses on various synthesis methods of cerium oxide nanoparticles and discusses their corresponding physical characteristics, anti-ROS and anti-inflammatory properties.
Tripeptide-based macroporous hydrogel improves the osteogenic microenvironment of stem cells
Authors: Li Qian , Zhang He , Pan Jijia , Teng Binhong , Zeng Ziqian , Chen Yang , Hei Yu , Zhang Siqi , Wei Shicheng , Sun Yuhua
Published: July 2021

A tripeptide-based macroporous hydrogel simultaneously promoted osteogenesis and angiogenesis, which is significant for 3D cultures and stem cell-based tissue engineering.
Precursor engineering for high-quality Cs2AgBiBr6 films toward efficient lead-free double perovskite solar cells
Authors: Hou Ping , Yang Wenxiang , Wan Ning , Fang Zhi , Zheng Jinju , Shang Minghui , Fu Dingfa , Yang Zuobao , Yang Weiyou
Published: July 2021

We report a facile BiBr3(DMSO)2 adduct process to produce high-quality Cs2AgBiBr6 films with large grains for the first time, which leads to an enhancement of over 40% on the PCE of Cs2AgBiBr6-based solar cells compared to that of the control sample.
Perspectives for polychlorinated trityl radicals
Authors: Ratera Imma , Vidal-Gancedo Jose , Maspoch Daniel , Bromley Stefan T. , Crivillers Núria , Mas-Torrent Marta
Published: July 2021

The multifunctional character and stability of PTM radicals makes them appealing in a broad range of fields, from active components in molecular optoelectronics to active agents in bio-applications.
Discovery of a recurrent spectral evolutionary cycle in the ultra-luminous X-ray sources Holmberg II X–1 and NGC 5204 X–1
Authors: Gúrpide A. , Godet O. , Vasilopoulos G. , Webb N. A. , Olive J.-F.
Published: July 2021

Context. Most ultra-luminous X-ray sources (ULXs) are now thought to be powered by stellar-mass compact objects accreting at super-Eddington rates. While the discovery of evolutionary cycles have marked a breakthrough in our understanding of the accretion flow changes in the sub-Eddington regime in Galactic black hole binaries, their evidence in the super-Eddington regime has so far remained elusive. However, recent circumstantial evidence hinted at the presence of a recurrent evolutionary cycle in two archetypal ULXs: Holmberg II X–1 and NGC 5204 X–1.

Aims. We aim to build on our previous work and exploit the long-term high-cadence monitoring of Swift-XRT in order to provide robust evidence of the evolutionary cycle in these two sources and investigate the main physical parameters inducing their spectral transitions.

Methods. We studied the long-term evolution of both sources using hardness-intensity diagrams (HID) and by means of Lomb–Scargle periodograms and Gaussian process modelling to look for periodic variability. We also applied a physically motivated model to the combined Chandra, XMM-Newton, NuSTAR, and Swift-XRT data of each of the source spectral states.

Results. We robustly show that both sources follow a clear and recurrent evolutionary pattern in the HID that can be characterised by the hard ultra-luminous (HUL) and soft ultra-luminous (SUL) spectral regimes, and a third state with characteristics similar to the super-soft ultra-luminous (SSUL) state. The transitions between the soft states seem consistent with aperiodic variability, as revealed by a timing analysis of the light curve of Holmberg II X–1; albeit, further investigation is warranted. The light curve of NGC 5204 X–1 shows a stable periodicity on a longer baseline of ∼200 days, possibly associated with the duration of the evolutionary cycle.

Conclusions. The similarities between both sources provide strong evidence of both systems hosting the same type of accretor and/or accretion flow geometry. We support a scenario in which the spectral changes from HUL to SUL are due to a periodic increase of the mass-transfer rate and subsequent narrowing of the opening angle of the super-critical funnel. The narrower funnel, combined with stochastic variability imprinted by the wind, might explain the rapid and aperiodic variability responsible for the SUL–SSUL spectral changes. The nature of the longer periodicity of NGC 5204 X–1 remains unclear, and robust determination of the orbital period of these sources could shed light on the nature of the periodic modulation found. Based on the similarities between the two sources, a long periodicity should be detectable in Holmberg II X–1 with future monitoring.
Distributed monitoring system for overhead lines insulations and substations based on wireless capacitive sensors
Authors: Zaripov Damir , Nasibullin Rustem , Zakirov Dinar
Published: July 2021

In this paper proposed three modifications to the monitoring system of the overhead lines, insulation state and substations based on sensors installed on supports and insulators. The sensors operate on the principle of capacitive coupling with an insulating structure. Differences between the system modifications in the information present options: light indication for control when bypassing lines and substations and changing graphics on the computer (smartphone) screen when receiving data in real time from sensors using cellular communication. The principle of operation and functional diagrams of the system with results of tests and experiments with manufactured product samples in laboratory and field conditions are presented.
The applications of anisotropic electrodes in vacuum circuit breakers to increase the switching life
Authors: Samofalov Yuri , Valeev Ilgiz , Maksimov Victor
Published: July 2021

The article analyzes the disadvantages of the vacuum circuit breaker, the transients that occur during switching, as well as the processes that lead to a decrease in the contact system resource. The simulation of the vacuum circuit breaker electrodes was performed using the COMSOL Multiphysics software package. The possibility of increasing the energy characteristics of vacuum circuit breakers by using single-crystal electrodes of copper, nickel, and iron as overlays is shown. A contact device for a vacuum circuit breaker with arc-resistant pads made of anisotropic materials has been developed.
Elements of circular technologies in aquaculture on the waters of energy facilities
Authors: Kalaida Marina , Khamitova Madina , Kalaida Andrey , Borisova Svetlana , Babikova Valeria
Published: July 2021

The elements of circular technologies in aquaculture on various energy waters are considered. The development of forms of aquaculture from pasture to industrial with an increase in the share of circular technologies is shown. It is noted that the use of cage fish farming on warm waste waters of energy facilities is complicated by eutrophication at high fish stocking densities and the peculiarities of temperature and hydrochemical regimes. The necessity of selection of new aquaculture objects with a fast growth rate, thermophilic and not demanding to the oxygen content in water is noted: a promising object of cultivation in warm waters is the African clary catfish (Clarias gariepinus). Possibilities of including other representatives of catfish - shill catfish (Pangasius) are considered. The results of experimental cultivation of spicy vegetable crops on waste products of crucian carp and clary catfish are presented. The analysis of own data and data of foreign sources is carried out. The dependence of the growth of valuable plant species on the type of fish in aquaponics is shown. Aquaculture and aquaponics as specific components of the modern agricultural sector in the development are focused on industrial production technologies using circular technologies for the efficient use of resources.
Features of the physical and chemical characteristics of water of energy facilities for aquaculture tasks
Authors: Kalaida Marina , Gordeeva Maria
Published: July 2021

Energy facilities and water are inextricably linked. Accordingly, the issue of water quality, its transformation as a result of industrial use of energy facilities and the assessment of further use for aquaculture purposes is an urgent task of our time, especially in relation to weather and climate risks for industries. The article provides a classification of water according to the water supply technology of energy facilities by temperature factor and the possibility of using it for aquaculture tasks. In total, three classes of water are distinguished according to the temperature factor: waters with natural physical and chemical characteristics, where the temperature regime of reservoirs corresponds to the geographical zone in which the reservoir is located (cultivation of fish associated with fish-breeding zone in which the reservoir is located); water of bassin-coolers of energy facilities, characterized by the presence of a zone of increased temperatures as a result of the discharge of heated water (organization of flood-proof farms with polycyclic production); water of cooling ponds (cultivating fish capable to the fight against eutrophication).
Strategies development for the formation of resource-saving regional energy systems based on data mining methods
Authors: Lisin Evgeny , Kurdiukova Galina , Zameshaeva Irina
Published: July 2021

The Russian regions have been tasked with reducing the energy intensity of the country’s gross product through the implementation of regional state programs for the formation of resource-saving energy systems. The required reduction in the GRP energy intensity can be achieved by different types of strategies for the development of the energy economy of the regions, the effectiveness of which largely depends on the production, technological and structural features of regional energy systems. In the work, using data mining tools, clustering and classification of regional power systems are carried out and the best resource saving strategies are proposed for each of the selected groups of power systems.
Fluctuation in the Level of the Caspian Sea and its Consequences
Authors: Kenzhegaliev Akimgali , Kanbetov Assylbek , Kulbatyrov Dauren , Shakhmanova Aiauzhan , Abilgaziyeva Ainagul
Published: July 2021

While in the early neogene, tectonic and to a lesser extent climatic factors impacted on the sea level, at the present stage climatic, man-made and anthropogenic factors are at the forefront. As a result of an increase in the level of the Caspian Sea by more than 2.4 m, 35-40 thousand square meters km of territory was flooded, during the flooding and flooding of the coastal territory for the period 1978-1995 led to a change in natural, socio-economic and medico-ecological conditions. The consequences of rising sea levels led to the resettlement of about 100 thousand people living in the coastal flooded zone of the Northern Caspian Sea and many industrial facilities.
Investigation of the Algorithm to Find Defects in High-voltage Insulators for an Automated Thermal Imaging Control System
Authors: Zaripova Alina , Zaripov Damir , Usachev Alexander
Published: July 2021

This paper describes a software algorithm for detecting defective insulating structures using infrared images. The defect detection criteria are based on a joint analysis of the mean and standard value of the brightness distribution of a set of insulators. The effectiveness of the developed criteria is substantiated by the results of laboratory tests of a significant number of insulators removed from high-voltage lines according to the results of thermal imaging diagnostics. Simultaneous analysis of thermograms of the same type of insulating structures according to the proposed algorithm is more effective in comparison with the subjective assessment of each of them separately, which was used earlier. In addition, this approach allows to reduce the time of analysis and decision-making based on the results of diagnostics.
Determination of the antioxidant additive “Ionol” in transformer oil by gas chromatographic method
Authors: Duy Hung Nguyen , Taneva A.V. , Novikov V.F.
Published: July 2021

Transformer oil is widely used in power oil-filled electrical equipment, which is an insulating and diagnostic medium. During the operation of power transformers, its operational and dielectric properties deteriorate. To increase the operating time of transformer oil, it is inhibited by an antioxidant additive, which is most often used as ionol and the ionol concentration must be constantly monitored. This control is carried out by chromatographic methods. The main problem of controlling the antioxidant additive in transformer oil is its extraction with organic extractants, which are ethyl alcohol, which contains water, which has a negative effect on the extraction process. Thus, a search for more effective extractants for the extraction of ionol from transformer oil was undertaken. The retention characteristics of individual organic extractants and antioxidant additives were determined by the method of high-performance gas-liquid chromatography using a quartz capillary column and an automated system for dosing a sample into the chromatograph under various experimental conditions. Both the isothermal mode of the experiment and under linear programming conditions of the chromatographic column have been used. The dependence of the retention characteristics of organic extractants and ionol on the temperature of analysis was established, which has a linear form.
Energy of adsorption of an adsorbent in solving environmental problems
Authors: Jumaeva Dilnoza , Abdurakhimov Akmal , Abdurakhimov Khodjiakbar , Rakhmatullaeva Nigora , Toirov Olimjon
Published: July 2021

The article presents the results of the study of the adsorption energy, thermodynamic parameters of adsorbents, which serve to solve the problems of ecology and environmental protection.Based on the results obtained, the adsorption mechanism of the pargaz activated carbon adsorbent on the basis of tree wood and waste stem was studied.The energy of the adsorption process of the adsorbent is obtained on the basis of data on the full thermodynamic parameters of the field of application of adsorbents. The paper examines the differential heat content, adsorption isotherm, entropy, and kinetics of PPAU-A experimentally. This article uses adsorption microcalorimetric methods of analysis. Paulownia tomentosa tree coal adsorbents according to the adsorption amounts of water molecules in thermally and steam-gas activated carbon adsorbents based on tree stems is as follows: PPAU-A> BAU-A.The value of the adsorption value of water vapor in PPAU-Ada Beryoze activated carbon was found to be 1.4 times higher than BAU-A.
Research of Ecological Safety and Chemical Compositions of Phospholipids Obtained from Local Vegetable Oils and Their Miscelles
Authors: Sagdullaeva Dilafruz , Turaev A.S. , Salikhanova Dilnoza , Abdurakhimov Saidakbar , Jumaeva Dilnoza , Ruzmetova Dildora
Published: July 2021

There is considered the environmental safety and chemical composition of phospholipids obtained from local vegetable oils and miscella. It was established that the complex analysis of phospholipids using modern methods of IR, NMR, and mass spectroscopy made it possible to identify the main types of phospholipids used in cotton oils obtained by pressing and extraction methods. It is displayed that cottonseed oil, regardless of the method of its production, contains a certain amount of gossypol and its derivatives, since it is environmentally unsafe and these surfactants should not be used for food purposes, which gives reason to recommend the isolated phospholipids for use in technical purposes.
Development of an optimal control system with pulse control in the rotor circuit for cargo movement mechanisms
Authors: Sinyukov Alexey , Sinyukova Tatyana , Meshcheryakov Victor , Gracheva Elena
Published: July 2021

The paper analyzes the methods of starting an asynchronous motor with a phase rotor. The control system used on the object under consideration, the mechanism of cargo movement, is obsolete. Current problems in modern production are measures aimed at energy saving at all stages of production, as well as ensuring the necessary dynamic indicators of control systems. In this paper, several control systems for the mechanism of cargo movement are considered and investigated. The optimal control system for several indicators is proposed. The Matlab Simulink package simulates various start-up methods, namely: direct start-up from the network, rheostatic start-up of an asynchronous motor with a phase rotor, pulse start-up of an asynchronous motor with a phase rotor, asynchronous-valve stage and asynchronous-valve stage with pulse regulation. According to the obtained graphs, a comparison is made and conclusions are drawn about the advantages and disadvantages of each of the start-up methods, as well as graphs of the consumption of active and reactive energy of each of the methods and the most energy-efficient control method is identified.
Capacity Limitations of brine Contamination on High Density Oil-Based Drilling Fluid
Authors: Li Shuanggui , Fan Sheng , Li Jiaxue , Li Yingting , Qi Biao , Fan Junwei
Published: July 2021

Aimed on the problem that the Drilling fluids were easily intruded by the saline water in high-pressure salt-gypsum formations, and the properties of the drilling fluid were damaged and accidents easily occur. The mechanism of drilling fluid contamination by the formation brine was analyzed and the capacity limits of the contamination were found out. The results show that small amount of brine invasion causes emulsification while large amount of brine invasion lead to demulsification. Two capacity limitations were proposed. The first limitation is 10% of saline water concentration, below which the performance of the drilling fluid remains relatively good. The second limitation is 30% of saline water concentration, below which the drilling fluid needs to be systematically maintained, and after which the fluid has no potential for maintenance. This proposal has been successfully used in 8 wells in Kuqa foreland area, and the drilling cycle was saved by 35 days on average.
Laboratory simulation on drifting of hazardous chemical substance
Authors: Wang Xing , Wei Lai , Li Xiuren , Yang Fan , Liu Ying , Wang Chunhui , Liu Yunlong
Published: July 2021

The continuously increase of hazardous chemicals transportation leads to a high risk of chemicals leakage. Researches on drifting of chemical substances are of vital importance in damage reducing. Laboratory simulation on drifting of hazardous chemical substance carried out inside a wave tank at the Shandong Provincial Key Laboratory. Different environmental conditions (wind, wave, etc.) were simulated in the wave tank to find out the influence of these factors on substance drifting and diffusion. To identify the difference between hazardous substance, floating ball and dyed petroleum oil were used to simulate solid and liquid floating hazardous chemical substance. The result revealed that wave can improve diffusion, the diffusion speed varies with wave height. Wind can drive surface substance, the drifting coefficient ranges from 2.1% to 3.0%, while liquid drifting coefficient is relatively larger. The laboratory results provide a basis for the study on the drifting and diffusion of hazardous chemicals at sea. Meanwhile, the coefficient could be applied as a correction in numerical models to improve prediction accuracy.
Recognition and adsorption of uranyl ion by ion imprinted polymer based materials
Authors: Bai Jin , Yi Yang , Xiao Xilin , Ge Yi
Published: July 2021

Ion imprinted polymer is a kind of three-dimensional material with special cavity structure. Its cavity site has the function of specifically recognizing and binding target ions. It is a kind of materials that can selectively combine, enrich and remove target ions in the environment. Uranium is an important radioactive element, which has been widely used in nuclear power, military industry, science and technology and other fields. However, the accumulation of uranyl ions in environmental water causes serious health hazards to human body. Therefore, the detection and enrichment of uranyl ions in water is of great significance. In this paper, the theory, technology and application status of ion imprinted polymer for micro detection and adsorption of uranyl particles in wastewater were reviewed, and the development of uranyl ion imprinted polymer was prospected.
Synthesis and Structure of the Copper Complex[Cu2L2ox(SO4)(H2O)4](H2O)4
Authors: Wang Zhaodong
Published: July 2021

The reaction of N-(pyridine-2-ylmethyl)pyrazine-2-carboxamide (HL) and copper(II) sulfate leads to the formation of a new copper complex, [Cu2L2ox(SO4)(H2O)4](H2O)4(1), in which the deprotonated amide L-ligand was oxidized to a imide Lox-exposed to the air in the presence of the Cu ion. The X-ray crystal analysis reveals that it consists of two mononuclear copper unit with different coordination modes, multiple O-H…O hydrogen bonding between water molecules or water and sulfate O atom to form 3D networks. CCDC: 2088935,1.
Preparation and characterization of coal gangue/Al cermet materials
Authors: Wu Guihua , Tang Lihua
Published: July 2021

In this study, the calcined coal gangue was mixed with Al powder at different mass fractions (5wt%〜35wt%). After being pressed at 80MPa and sintered at 1200°C for 2h, the coal gangue/Al cermet material was obtained. The phase composition, microstructure and mechanical properties of the material were studied. The results show that the main components of the prepared materials are Al, mullite, AlN, alumina and silicon. With the increase of coal gangue powder, the hardness of coal gangue/Al cermet gradually increases, while the static compression strength first increases and then decreases. When the mass fraction of gangue is 25wt%, the coal gangue/Al cermet material has the best performance. Density is 2.23g/cm3, hardness is 752HV, static compression strength is 127.3MPa.
Effect of Oil Content in Tea-seed Pancake on the Determination of Tea Saponin
Authors: Jiang Longfa , Bai Lingyun , Zhang Shumin , zhang Heng , Tu Xuming
Published: July 2021

According to the national standard for the determination of tea saponin content in tea-seed pancake (GB/T 35131-2017), tea saponin was obtained by extracting oil with ethanol and removing solvent. The actual samples of tea-seed pancake did not completely remove the oil, and some of the residual oil content was as high as 9%. Due to the long period of national standard determination, people often use ethanol to extract tea saponin directly, instead of subsequent acid hydrolysis or alkali hydrolysis steps, so as to realize the rapid evaluation of tea-seed pancake quality. In this case, the residual oil has a greater impact on the results. If it was still tested according to the national standard method, the result will be much higher than the actual result. In this work, petroleum ether extraction process was selected before ethanol extraction to remove the residual oil. Experimental results showed that, the accuracy of the determination was effectively improved.
Chemical behaviours of Arsenium, Chromium, Mercury, Lead, and Strontium in aqueous system
Authors: Zhao Qiuyu , Wang Siyi , Wang Jianjun
Published: July 2021

Over the decades, the application of heavy metals and the expansion of civilization resulted in severe pollutions in aqueous solutions. The poor degradation of toxic heavy metal contaminants in hydrosphere undoubtedly posed a huge threat to environmental safety and biological health. In this review, as most common heavy metal pollutants, arsenium (As), chromium (Cr), mercury (Hg), lead (Pb), and strontium (Sr) were introduced in detail. The chemical behaviours, chemical status, biological toxicity, and migration of mentioned contaminants were summarized. This work highlighted and reviewed the basic information of five heavy metal pollutants, which provided a new direction of toxic heavy metal ion remediation.
Advantage analysis of aluminum honeycomb composite used in motorhomes
Authors: Shao Xinghai , Yang Qianqian , Liu Yuan , Cao Lei
Published: July 2021

In the light weight, high weather resistance and environmental protection requirements of the panel used for the motorhome, aluminum honeycomb composite, new material with mature the quality improvement and material upgrading of the panel used for the motorhome. In this paper, the existing problems of the panel used for the motorhome and the properties of aluminum honeycomb composite are discussed, the advantages of applying aluminum honeycomb composite to the board of the motorhome are analyzed. The application of aluminum honeycomb composite materials to motorhomes will meet the requirements for improving the quality of panels, such as reduced in weight, environmentally friendly, non-combustible, recyclable, improved weather resistance and increased service life.
Spatial Association characteristics of facilities around scenic spots considering distance and orientation: A case study of 3A and above scenic spots in Beijing
Authors: Cao Hansong , Qin Jiahui , Yi Disheng , Liu Yusi , Zhang Jing
Published: July 2021

In the urban tourism and service industry, the POI data with coordinate and attribute information of the major map platforms constitute one of the important data sources of the urban tourism and service industry. In this paper, the spatial data transaction database under four distances was established based on the gate buffer of 3A and above scenic spots in Beijing. The Apriori algorithm was used to calculate the lifting degree to obtain the distance for mining the best association features of 3A, 4A and 5A scenic spots, and then the association features of the three scenic spots in different directions were analysed.
Evaluation and Optimization of Urban Basic Education Facilities Layout based on GIS——A Case Study in Xuzhou, China
Authors: Yue Ma , Shan Shen
Published: July 2021

The layout of educational facilities has become a hot topic in urban geography research. Guides by rational demand consensus, typical human settlements extraction and matching of physical property planning, this paper constructs an evaluation system for the spatial layout of urban basic education facilities from the perspective of “Homo-Urbanicus” theory. The content includes the evaluation of accessibility, evaluation of bearing pressure, classification of layout types, selection and analysis of excellent communities. This paper conducts an empirical research on the basic education facilities of kindergartens, elementary schools and middle schools in the main urban area of Xuzhou City. And then, we delineated excellent community, standard communities, under-covered communities, overstressed communities, undeveloped communities on the basis of evaluation results. Finally, we selected sample communities for analysis, and put forward relevant optimization strategies.
The Temporal and Spatial Variations of Stable Isotopes in Precipitation on Different Scales in Yangtze River Basin
Authors: Meng Ruiheng
Published: July 2021

Analysis is conducted on the temporal and spatial variations of stable isotopic composition in precipitation, using the data of IAEA/WMO sampling stations, in Yangtze river basin. The correlations between δ18O in precipitation and air temperature/amount of precipitation are analyzed at individual stations and in the whole valley on monthly or annual scales. There is a notable amount effect, the distinct inverse relationship between δ18O and precipitation, on monthly scale in the Yangtze valley and at the selected stations except Chongqing. Compared with monthly scale, the positive correlation between δ18O and air temperature is more marked on annual scale. The interannual variations of δ18O reflect the change of large-scale climate and environment, and are mainly controlled by large-scale weather conditions.
Numerical simulation of wave spectrum during a typhoon
Authors: Kong Congying , Liu Hao
Published: July 2021

The third-generation wave model WAVEWATCH-III was used to numerically simulate the wave under the influence of a typhoon in the coastal area of China. The wave spectrum at the buoy point was output, and the characteristics of the wave spectrum were analyzed. The change of the wave spectrum during the typhoon process reflected the growth process of typhoon formation, development and extinction. The relationship between the wave spectrum and the wind direction was intuitively shown by the directional spectrum, indicating the coexistence of wind waves and swells in the sea area during the typhoon process.
Study on sedimentary facies characteristics of Xujiahe Formation in Sichuan Basin
Authors: Zhiguo Wang
Published: July 2021

Sedimentary facies is the summation of all primary sedimentary features in a sedimentary unit, which is the product of sedimentation in a specific environment. It emphasizes the material performance of sediment formation conditions, including mineralogy, petrology, paleontology, geochemistry and geophysics. Therefore, it has unique sedimentary features in this environment. In this paper, the types and units of sedimentary facies which can reflect the basic characteristics and geometry of sedimentary system are established, and based on the comprehensive analysis of rock types, lithological assemblages, sedimentary structures, palaeontological assemblages and section structures, the sedimentary facies types of Xujiahe formation of Upper Triassic in the study area mainly include semi-arid flooded basin facies, delta facies, beach bar-lagoon system and lake facies, among which delta facies and beach bar-lagoon system are the main sedimentary facies types. Because sedimentary facies is the historical product of basin formation, evolution and extinction, it can not only reflect the formation conditions, temporal and spatial distribution and evolution law of related strata and rock types, but also be the basis for analyzing the nature and structural background of sedimentary basin. At the same time, the analysis of sedimentary facies is of great significance for understanding and analyzing the evolution history of basin and guiding the exploration and development of related oil and gas resources.
Advances in Remote Sensing Extraction of Urban Roads
Authors: Shujun Liu
Published: July 2021

As early as 1970s, the United States has begun the research of remote sensing image processing technology. In recent ten years, the research of road remote sensing extraction in China has also advanced by leaps and bounds. High resolution remote sensing images have been widely used in many fields, such as urban development planning, environmental monitoring and evaluation, and public announcement information services. The main application goal of remote sensing image is to extract the information of the object of interest, then identify it and complete the image understanding. Road is the most important and basic transportation mode of human beings, which provides a lot of support for the development of human civilization. road extraction is important for traffic management, including urban planning, road monitoring, GPS navigation, map updating, image registration, etc. extracting roads from high-resolution remote sensing satellite images is not only a challenging research direction, but also of great practical value.
The practical application of information technology in marketing
Authors: Ma Yanyang
Published: July 2021

Marketing is a discipline closely related to social and economic development. In the teaching practice of marketing, we should scientifically and comprehensively reform the teaching methods of education and actively apply information technology to effectively and effectively improve the overall quality of marketing. And level, to better improve the overall literacy and cognitive abilities of students.
Business-oriented data management in conglomerates: insights from government data sharing
Authors: Lv Zhepeng
Published: July 2021

Nowadays, the management of big data has become an emerging question for companies. Managers in conglomerates, or corporations made up of many businesses, concern more about data management as data integration and sharing inside the corporate can bring about product innovation, risk control and operation efficiency. To solve the technical and managerial problems that hinder data sharing, this study drew reference from federal enterprise architecture framework implemented constructed by the United States. By exploring this framework, this study suggests a methodology for data sharing in conglomerates, and stresses on the business-driven principle and a top-down architecture design with supporting from high-level decision-making.
A New Method to Determine the Lower Limit of Reservoir Physical Properties—Corrected Minimum Flow Pore-throat Radius Method
Authors: Dai Jinyou , Lin Lixin , Wang Rui
Published: July 2021

The lower limit of reservoir physical properties is an important parameter for identifying reservoirs and determining effective thickness in reserves evaluation, and is also an important basis for selecting perforated test intervals in oilfield exploration and development. There are many methods to determine the lower limit of reservoir physical properties, and the minimum flow pore throat radius method is one of the commonly used methods. The method uses 0.1μm as the minimum flow pore-throat radius, and uses this to calibrate the lower limit of reservoir physical properties. However, according to the water film theory, the minimum radius of the reservoir's flowing pore throat is not a definite value, but varies with the displacement dynamics. Therefore, there is no exact basis for using 0.1μm as the minimum flow pore-throat radius, so it needs to be corrected. To this end, a new method for determining the lower limit of reservoir physical properties—the corrected minimum flow pore-throat radius method is proposed. The correction method comprehensively considers the factors of oil and gas accumulation dynamics, and determines the lower limit of reservoir physical properties by obtaining the minimum flow pore-throat radius value suitable for oil and gas accumulation dynamics. A case study of Chang 63 reservoir in A Oilfield shows that the minimum flow pore radius of oil and gas determined by the correction method is 0.08 μm, and the lower limit of reservoir physical properties (porosity 9.1%, permeability 0.117 × 10-3 μm2). The traditional method has a minimum flow pore-throat radius of 0.1 μm and a lower limit of reservoir physical properties (porosity of 9.8% and permeability of 0.133 × 10-3 μm2). Due to full consideration of the impact of oil and gas accumulation dynamics, the minimum flow pore-throat radius determined by the correction method is more reliable than the traditional method, and the lower limit of the reservoir physical property calibrated by it has practical significance.
Research on the detection and early warning technology of harmful marine organisms in the water intake of nuclear power plant by 3D image sonar
Authors: Zhang Jianfei , Wu Zhongpeng , An Chong
Published: July 2021

In view of the frequent water intake blockage caused by marine biological invasion in many nuclear power plants, which affects the safety of cold source in nuclear power plants, a defense system in depth including marine biological identification, detection, early warning and hierarchical response is established through investigation and analysis of the causes of the event. Underwater acoustic high-resolution multi beam detection method is used to detect jellyfish, hairy shrimp and other marine organisms, The echo characteristics are obtained, the distribution density in sensitive sea area is analyzed, and the effective early warning judgment is given. Among them, detection and early warning is the front-end disposal measure, which can provide accurate and timely marine biological information for the subsequent hierarchical response. At the same time, it can replace the underwater inspection work of divers, reduce the risk of divers, reduce the risk of industrial safety, and improve the reliability of cold source.
Research on the Coordination of Environmental Pollution and Industrial Structure Upgrading from the Coupling Perspective
Authors: Zhang Wenjing
Published: July 2021

Economic transformation and industrial structure upgrading are critical to achieving environmentally sustainable development. Based on the inaccurate data analysis of the VEC model and the logarithmic average exponential decomposition method, this paper proposes an analysis of the two-way coupling relationship between natural gas energy consumption and environmental pollution. Through the identification of conceptual models of the re-linking and decoupling relationship between energy consumption and environmental pollution, two-dimensional endogenous variables and exogenous variables are determined. The research results show that both energy consumption and CO2 emissions are on the actual data statistical line, with an error of 0. At the end, the article puts forward policy recommendations to promote the coordinated development of urban agglomeration environmental pollution and industrial structure upgrading.
A Qualitative Study on the Influencing Factors of Public Participation in the Construction of “Waste-Free City” Exploratory Analysis Based on Grounded Theory
Authors: Chai Mao , Jiao Jing , Han Yu
Published: July 2021

As a cellular project of beautiful China and a systematic project of the whole people, the construction of “Waste Free City” cannot be separated from the extensive participation of the public. This research in China’s Henan province “no waste city” construction of public participation as the research object, using the grounded theory, first through open and spindle coding that affecting public participation “no waste city” of the construction of the six main factors: attitude, subjective norm, perceived behavioral control, driving factors and social environment and identity characteristics; Then a model of influencing factors of public participation is constructed through selective coding. The results show that participation attitude, subjective norms and perceived behavior control directly affect the willingness of the public to participate in the construction of “waste-free city”, which are internal psychological factors. Government behavior, group influence, community factor and enterprise factor constitute the external environmental factors that affect public participation. The three categories of publicity and education, reward and punishment mechanism and laws and regulations form the driving factors of public participation in the construction of “waste-free city”, which play a moderating role between internal psychological factors and external environmental factors. At the same time, identity characteristics also directly affect the public participation behavior in the construction of “waste-free city”.
Study on Coupling Effect of Additives on NOx Control in Coal Pyrolysis-Combustion
Authors: Kong Xianglu , Yang Song , Liu Shoujun , Zhang Kaixia , Jiao Tingting , Shangguan Ju
Published: July 2021

A large amount of nitrogen oxides produced by loose coal combustion has an important impact on the ecological environment. To solve this problem, it is proposed to prepare clean coke instead of loose coal combustion to reduce the emission of nitrogen oxides from civil coal combustion. Clean coke is prepared by pyrolysis raw coal adding additives, and the gas generated by pyrolysis is collected uniformly, thus avoiding the emission problem in the process of loose burning. In addition, the clean fuel catalyzes the reduction of nitrogen oxides to produce N2 in the combustion process, thus reducing the emission of combustion nitrogen oxides. In this paper, the additives were investigated, and finally it was found that loading 1 wt.% Fe and Ni had a better effect of decrease nitrogen content in coke through pyrolysis of coal and denitrification during the combustion of coke, and had a coupling effect on nitrogen oxide control in the pyrolysis-combustion process.