bluuebunny/crossref_metadata_2025 huggingface dataset:
Donor–acceptor molecular architecture involving carbazole/pyrazine/anthraquinone units for efficient supercapacitor applications
Authors: Ambore Sumit D. , Rao Chepuri R.K. , Bhosale Sidhanath V. , Bhosale Sheshanath V.
Published: July 2023

A donor–acceptor composed of two 3,6-di-tert-butyl-9H-carbazoles (DTCs) and fused pyrazine (Pyz; 1)-anthraquinone (AQ; 1) was successfully synthesized and utilized for pseudocapacitor applications.
Stabilizing tetramethylammonium lead iodide perovskite and exploring its electronic and optical absorption for solar cell absorber application
Authors: Agbaoye Ridwan O. , Adebambo Paul O. , Kenmoe Stephane , Adebayo Gboyega A.
Published: July 2023

We present a thermodynamically stable tetramethylammonium lead iodide perovskite with GW0 and GW bandgaps of 2.63 eV and 2.83 eV. At 293.15 K, an SLME efficiency between 7% and 12% was reported between 0.01 μm and 100 μm absorber thicknesses.
Deuterated squalene and sterols from modifiedSaccharomyces cerevisiae
Authors: Recsei Carl , Russell Robert A. , Cagnes Marina , Darwish Tamim
Published: July 2023

Biosynthesis of uniformly deuterated squalene and sterols; isolation, purification and analysis.
Metal-free and atom-efficient protocol for diarylation of selenocyanate by diaryliodonium salts
Authors: Radzhabov Amirbek D. , Soldatova Natalia S. , Ivanov Daniil M. , Yusubov Mekhman S. , Kukushkin Vadim Yu. , Postnikov Pavel S.
Published: July 2023

A metal-free and atom-efficient protocol for diarylation of selenocyanate by diaryliodonium salts has been developed.
NHC-mediated photocatalytic deoxygenation of alcohols for the synthesis of internal alkynes via a Csp3–Csp coupling reaction
Authors: Ma Xueji , Wang Liujie , Meng Xiaoqing , Li Wenbo , Wang Qin , Gu Yuke , Qiu Lingna
Published: July 2023

In situ generated NHC-alcohol adducts undergo C–O cleavage under photocatalytic conditions in a new approach to synthesize various internal alkynes. Mechanism experiment confirmed the generation of alkyl radicals.
A space vector pulse width modulation method for switched reluctance motor driven by full bridge power converter
Authors: Sun Haitao , Dou Yinke , Chen Yan
Published: July 2023

This study proposes a space vector pulse width modulation (SVPWM) driving method for the switched reluctance motor (SRM), which enables the use of a standard full‐bridge power converter to drive a three‐phase SRM with a ring structure, in place of the traditional asymmetric H‐bridge (AHB). Based on this driving topology, the SVPWM approach is employed to drive the SRM, and its performance is compared with that of the conventional SRM driving method utilising the AHB. The findings indicate that the SVPWM method can effectively reduce torque ripple in the SRM. Moreover, the experimental validation performed to verify the proposed driving topology and method yields results that closely align with the simulated outcomes.
Study on water absorption and dielectric response of epoxy resin impregnated paper bushing
Authors: Zhang Daning , Feng Xinyuan , Yang Zhi , Xu Haisong , Jiang Jiongting , Mu Haibao , Zhang Guan‐Jun
Published: July 2023

Epoxy‐impregnated paper transformer bushings are prone to water absorption due to the presence of water‐attracting moieties in the cellulose chemical structure and epoxy resin, leading to moisture‐induced insulation defects. To understand the mechanism of moisture's impact on epoxy‐impregnated paper, this study developed a testing platform that integrated moisture diffusion, adsorption, and dielectric properties of insulating materials. Insulation specimens made of epoxy resin and epoxy‐impregnated paper were prepared and their water diffusion characteristics were investigated using the Fick diffusion model and the Langmuir model, respectively. The Guggenheim–Anderson–de Boer equation was used to examine the vacuum vapour adsorption characteristics of the materials, providing a theoretical foundation for examining the form of water present within them. The dielectric response of materials with varying moisture levels was then tested to study the effect of water on the dielectric spectrum curve. Using the Extended Derivative Method, the characteristic frequency reflecting the water content of the epoxy‐impregnated paper was extracted. The results demonstrate that 0.01‐Hz characteristic frequency provides superior accuracy for moisture assessment in epoxy resins compared to 50 Hz, and extracting and fitting the relaxation peak characteristic frequency in epoxy‐impregnated paper moisture evaluation yields higher accuracy than using tan δ at the power frequency.
TAU: A neural network based telluric correction framework
Authors: Kjærsgaard R. D. , Bello-Arufe A. , Rathcke A. D. , Buchhave L. A. , Clemmensen L. K. H.
Published: July 2023

Context.Telluric correction is one of the critically important outstanding issues for extreme precision radial velocities and exoplanet atmosphere observations. Thorough removal of small so-called micro tellurics across the entire wavelength range of optical spectro-graphs is necessary in order to reach the extreme radial velocity precision required to detect Earth-analog exoplanets orbiting in the habitable zone of solar-type stars. Likewise, proper treatment of telluric absorption will be important for exoplanetary atmosphere observations with high-resolution spectrographs on future extremely large telescopes (ELTs).

Aims.In this work, we introduce the Telluric AUtoencoder (TAU).TAUis an accurate high-speed telluric correction framework built to extract the telluric spectrum with previously unobtained precision in a computationally efficient manner.

Methods.TAUis built on a neural network autoencoder trained to extract a highly detailed telluric transmission spectrum from a large set of high-precision observed solar spectra. We accomplished this by reducing the data into a compressed representation, allowing us to unveil the underlying solar spectrum and simultaneously uncover the different modes of variation in the observed spectra relating to the absorption from H2O and O2in the atmosphere of Earth.

Results.We demonstrate the approach on data from the HARPS-N spectrograph and show how the extracted components can be scaled to remove H2O and O2telluric contamination with improved accuracy and at a significantly lower computational expense than the current state of the art synthetic approachmolecfit. We also demonstrate the capabilities ofTAUto remove telluric contamination from observations of the ultra-hot Jupiter HAT-P-70b allowing for the retrieval of the atmospheric signal. We publish the extracted components and an open-source code base allowing scholars to applyTAUon their own data.
Stellar angular momentum of disk galaxies at z  ≈  0.7 in the MAGIC survey
Authors: Mercier W. , Epinat B. , Contini T. , Krajnović D. , Ciesla L. , Lemaux B. C. , Abril-Melgarejo V. , Boogaard L. , Pelliccia D.
Published: July 2023

Aims. At intermediate redshift, galaxy groups and clusters are thought to impact galaxy properties such as their angular momentum. We investigate whether the environment has an impact on the galaxies’ stellar angular momentum and identify underlying driving physical mechanisms.

Methods. We derived robust estimates of the stellar angular momentum using Hubble Space Telescope (HST) images combined with spatially resolved ionised gas kinematics from the Multi-Unit Spectroscopic Explorer (MUSE) for a sample of ∼200 galaxies in groups and in the field at z ∼ 0.7 drawn from the MAGIC survey. Using various environmental tracers, we study the position of the galaxies in the angular momentum–stellar mass (Fall) relation as a function of environment.

Results. We measured a 0.12 dex (2σ significant) depletion of stellar angular momentum for low-mass galaxies (M⋆ < 1010 M⊙) located in groups with respect to the field. Massive galaxies located in dense environments have less angular momentum than expected from the low-mass Fall relation but, without a comparable field sample, we cannot infer whether this effect is mass or environmentally driven. Furthermore, these massive galaxies are found in the central parts of the structures and have low systemic velocities. The observed depletion of angular momentum at low stellar mass does not appear linked with the strength of the over-density around the galaxies but it is strongly correlated with (i) the systemic velocity of the galaxies normalised by the dispersion of their host group and (ii) their ionised gas velocity dispersion.

Conclusions. Galaxies in groups appear depleted in angular momentum, especially at low stellar mass. Our results suggest that this depletion might be induced by physical mechanisms that scale with the systemic velocity of the galaxies (e.g., stripping or merging) and that such a mechanism might be responsible for enhancing the velocity dispersion of the gas as galaxies lose angular momentum.
Analysis on the Characteristics of PM2.5 Emissions from Coal-fired Power Plants in Jilin Province
Authors: Liu Yi , Zhu Baoyu , Zhao Liang , Wang Jian , Li Hongyan
Published: July 2023

The thermal power industry is the largest coal consumer, and the contribution of its air pollutants to PM2.5 has become a hot topic of public concern, which is worthy of in-depth study. There are a total of 32 thermal power generation enterprises in Jilin Province, of which 19 are coal-fired power generation enterprises, accounting for 59.37%. Based on the investigation and analysis of the basic situation of coal-fired power generation enterprises in Jilin Province, five typical coal-fired power generation enterprises have been identified as the research objects. In general, the larger the particle size is, the higher the removal efficiency will be. After analysis, it is concluded that the final smoke and dust discharged into the environment are mainly dominated by fine particulate matter. The filtration efficiency of a well-operated bag filter for PM2.5 is higher than that of an electric dust collector. The electric-bag compound dust collector combines the advantages of electric dust collector and bag filter and has the best filtering effect. The particles at the outlet of desulfurization drift to small-size particles.
Experimental and DFT research for the effects of sodium on the heterogeneous reaction between NO and semichar derived fromO2/CO2 pretreatments
Authors: Zhang Lei , Sun Rui , Wang Zhuozhi , Yuan Mengfan
Published: July 2023

The excessive emission of NO is endangering the ecological environment and the health of humans. In-depth research on the reduction mechanisms of NO is crucial to regulating NO emissions. In this research, the influence of sodium on the heterogeneous reaction of NO by semichar derived from O2/CO2 pretreatments were investigated through the experimental and density functional theory (DFT) method. According to the results of atomic dipole corrected Hirshfeld atomic charge (ADCH), the additional Na and oxygen-containing compound altered the semichar's charge distribution of. The additional Na weakened the positive effects of the marginal hydrogen. And the charge of the carbon, which was attached to the phenol group, changed from negative to positive due to the strong electron-trapping ability of the phenol group. The energy potential diagrams between NO and semichars derived from O2/CO2 pretreatments without/with sodium addition reflected that sodium was beneficial to reduce NO. Compared with pure O2/CO2 pretreatments, the additional sodium decreased the energy gap of the NO reduction by 144.68 kJ/mol. On the other hand, the temperature-programmed reduction (TPR) results were performed to identify the accuracy of the calculation results. The experimental results illustrated that adding sodium enhanced the NO reducibility of semichar, expressing great consistency with the theoretical results.
A Design Method to Diagnose Predicted and Measured Energy Performance Gap of Central Cooling Plant Based on Operation Mode
Authors: Bao Xiangzhong , Meng Huixian
Published: July 2023

Operation modes indicate the characteristics of the entire cooling plant, and are considered to be an underlying factor of energy performance gap. Operation mode difference between the simulation model and actual system is constituted by the differences in mode form, mode frequency, and mode energy consumption jointly. In the numerical model of ECDR, the energy performance gap is the function of the components of the operation mode difference. Based on the model, a central cooling plant case is analysed. Five typical mode forms for the simulation model and six for the actual system are extracted. For the corresponding mode form, due to the significant differences in cooling load characteristics and chiller energy efficiency, deviations in mode frequency are up to 55.6%, and the deviations in mode energy consumption ranges from -0.9% to 19.4%.
Effect of different biochar addition rates on Soil Physical Properties in rain-fed farmland
Authors: Jang Jing , Wang Qian , Zhang Jun , Dong Bo , Xu Wen-feng
Published: July 2023

Biochar is extensively used for ameliorating soil structure. However, the evaluation of soil physical properties influenced by its large-scale use is still unclear. Moreover, research on biochar is mainly based on laboratory tests, lacking medium and long-term field positioning tests. In this study, a local field trial was conducted for 3 years on the Loess Plateau in central Gansu, China. Six levels of biochar treatment were set with application amounts of 0 t·ha-1, 10 t· ha-1, 20 t·ha-1, 30 t·ha-1, 40 t·ha-1, and 50 t·ha-1 (CK, T1, T2, T3, T4, and T5, respectively). The influence of various input levels of biochar on soil porosity, bulk density, aggregate stability, and soil saturated hydraulic conductivity from the 0 cm to 30 cm layer were studied during the three years of wheat field experiments. The experimental study indicates that the increase of biochar addition can significantly (p < 0.05) reduce soil bulk density and increase not only soil saturated hydraulic conductivity but also total soil porosity, content of soil mechanically stable aggregates, and its MWD from the 0 cm to 30 cm soil layer. Among them, T5 treatment is the most significant (p < 0.05). While its content determination of Water Stable aggregates and its MWD only have an obvious (p < 0.05) improvement effect from the 0 cm to 20 cm soil layer, and T5 is the most significant. Therefore, large-scale biochar application is conducive to the improvement of farmland soil physical properties in this region.
Synthesis, Characterization and Photocatalytic Properties of Metal Phthalocyanine Modified Thermoresponsive Polymers
Authors: Wu Shan , Duan Yuhan , Duan Qian
Published: July 2023

In this study, 3-hydroxyethoxyphenyl-9(10), 16(17), 23 (24)-decyloxy-zinc phthalocyanine (HDPcZn) was first prepared by liquid phase catalysis, and then it was esterified with Poly-(N-isopropylacrylamide) which have two carboxyl groups (TRIT-PNIPAM) at the end to obtain a linear thermoresponsive polymer (PcZn-PNIPAM-PcZn) with two phthalocyanines at the end. The polymer was characterized by FT-IR, 1H NMR, EDS and UV-vis, and the photocatalytic performance of the polymer was tested with 1,5-dihydroxynaphthalene (DHN) as a model pollutant. The results showed that PcZn-PNIPAM-PcZn exhibited excellent photocatalytic oxidation ability for DHN under visible light irradiation (2h, 78.1 %).
Theoretical Studies on the Potential of Hypoiodous Acid to Self-Nucleate in Marine Regions
Authors: Zhang Shaobing , Liang Yan
Published: July 2023

The formation of new marine particles is closely correlated with the iodine-containing substances emitted by marine algae. Hypoiodous acid (HIO) is a common iodine oxoacid in marine regions. However, the potential of HIO to take part in the nucleation process and the relevant mechanism remain to be fully investigated. Herein, this study investigated the self-nucleation of HIO in marine regions and found that, although HIO can form (HIO)2-6clusters via medium hydrogen bonds, the (HIO)2-6clusters are inherently unstable. Therefore, the self-nucleation of HIO in marine regions is almost impossible. Moreover, compared with HIO molecules, HIO monomer is more inclined to bond with iodic acid (HIO3) molecules. This work may help to understand the new particle formation involving iodine oxoacids more comprehensively.
Effect of Metal Oxides on Combustion Characteristics of Excess Sludge
Authors: Ruan Min , Zhao Cheng , Xiao Yao , Yao ShiRong , Huang Jing
Published: July 2023

In this paper, it was studied that the effects of heating rate and four metal oxide on the combustion characteristics of excess sludge, such as CaO, Fe2O3, MgO and Al2O3, and the combustion kinetic parameters of sludge were obtained based on Coats-Redfern model. This result indicated that the ignition of sludge can be restricted with the increase of heating rate, but it was conducive to burnout, and the increasing about the flammability, stability and comprehensive combustion characteristic index of sludge. The addition of Fe2O3 and Al2O3 could improve the ignition performance of sludge to a certain extent, which was most obvious at the heating rate of 10 and 20 °C/min, respectively. Furthermore, the existence of Fe2O3, MgO and Al2O3 can improve the burnout performance of sludge, represented by MgO. Under the condition of low heating rate, the presence of Fe2O3 and MgO was beneficial to improve the comprehensive combustion characteristics of sludge. According to the distribution of combustion kinetics parameters, it was showed an increasing trend about the activation energy of sludge with the increase of heating rate at the range of 374.88-575.61 °C, which was also unfavorable to the combustion of fixed carbon. At the same heating rate, the activation energy decreased by adding Fe2O3 and Al2O3 at the range of 148.40-374.88 °C, which was beneficial to the release of volatiles and the combustion reaction, while the activation energy at the range of 374.88-575.61 °C decreased after adding CaO, which promoted the combustion of fixed carbon.
Model Of Difficulty Coal Seam Water Injection Based on Bayes Discriminant Analysis
Authors: Li Yunfei , Fu Ziqun , Niu Jiabao
Published: July 2023

Based on the basic idea of Bayes discriminant analysis method, the Bayes discriminant analysis model for the difficulty of coal seam water injection was established. This model selects seven indicators, namely burial depth, crack development degree, porosity, wetting edge angle, solidity coefficient, saturated water increment, and gas pressure, as discriminant factors. The difficulty of coal seam water injection is divided into three levels as three normal populations for Bayes discriminant analysis. Taking 23 groups of actual data of coal seam water injection project as training samples, Bayes discriminative model is established. Perform cross validation on 23 sets of measured data to obtain the accuracy of the model. Finally, Bayes discriminative model is applied to the actual coal seam water injection project. The research results show that the Bayes discriminant analysis model has a lower misjudgment rate and can be better applied in practical engineering.
Design and Analysis of a Photovoltaic Anti-Freezing System for Shallow Water Source Wells in Alpine Areas Compatible With Solar Water Lifting Project
Authors: Cao liang , Liu wen bin , Wang shi feng , Hu wei
Published: July 2023

In order to solve the problem that shallow water source wells in northern pastoral areas are prone to freezing in winter, which brings inconvenience to drinking water for local residents. shallow water source wells are taken as the research object. Through field experiments indoor and software simulations, the key factors to prevent freezing of water source wells are discovered by obtained temperature distribution pattern of water source wells,A photovoltaic heating system compatible with existing solar water extraction systems in pastoral areas is designed. It is found that the temperature distribution of water source wells is “steep-slow- slow” in the field and extreme conditions. The steep-rising areas are located at 0.0-1.3m, 0.0-0.8m away from the wellhead, and the temperature rising rates in the steep-rising areas are 10.58 C/m and 15.75 C/m, respectively. Increasing the temperature of “steep rise zone” is very important to improve the water surface temperature of water source wells. The ANSYS software was used to simulate the temperature field of the water source well under extreme conditions (-40℃), and compared with the indoor simulation results to verify its accuracy. A photovoltaic heating system compatible with the existing solar water lifting system in the pastoral area was designed which can generate 1659.52J heat a day larger than 412.2J heat dissipation per day under extreme conditions which is calculated by software model. Theoretically this system can meet antifreeze requirements. An indoor anti-freezing experiment of solar heating for a freezing period (3 months) was carried out. It was found that the temperature at the water surface of the water source well was about 0℃, which verified the feasibility of the solar heating system.
Study on the Measurement of Agricultural Eco-Efficiency and the Influencing Factors in the Yellow River Basin
Authors: Li Yajing , Ma Rong
Published: July 2023

Based on the background of getting the “Double Carbon” target and the high-quality advancement of the Yellow River basin, the agricultural carbon emissions and agricultural eco-efficiency of the nine provinces in the Yellow River basin from 2011 to 2021 were quantified using a carbon emissions computation model and an Super-SBM Model. ArcGIS was utilized to clarify the spatiotemporal evolution features of both variables, and a panel Tobit model was utilized to conduct empirical assessment of the contributing factors of agricultural eco-efficiency. The results demonstrated that since 2016, the carbon emissions of the Yellow River basin have shown the “high output-low emissions” of characteristics. The agricultural eco-efficiency is overall at a medium to high level and has constantly improved environmentally, but there are significant inter-provincial differences. Empirical examination analysis indicated that the economic development level of the Yellow River basin is positively U-shaped with regard to agricultural eco-efficiency, and rural per capita disposable income, machine tool density, industrialization level, and the regard of field planting of food crops have a substantial effect on agricultural ecological efficiency. Among them, machine tool density shows a negative effect, while other factors show a positive effect. Based on this, a proposal is designed to improve the structure of agricultural input determinants] by pooling determinant endowments, promote the reasonable assignment of agricultural factor resources among provinces, and enhance agricultural ecological efficiency to support the high-quality promote of the Yellow River basin.
Research on the Design and Application of Rural Houses in Northern China Based on Energy-saving Retrofit Technology
Authors: Dong Hao
Published: July 2023

The poor thermal performance of rural buildings and the severe pollution caused by coal combustion in northern China are urgent problems that need to be addressed. To solve these two issues, the current status of building envelopes in rural houses in northern China and the commonly used heating methods by rural households were analyzed. The study found that most rural houses lack insulation measures in their building envelopes and require energy-saving renovations. To improve the thermal performance of rural houses, the thermal performance of a rural household’s building envelope was measured and energy-saving renovations were conducted. The measurement results showed that the heat transfer coefficients of the walls, windows, and roofs decreased by 72.7%, 61.59%, and 64.99%, respectively, after the energy-saving renovations, compared to the national limit values. The thermal performance of all building envelope components met the national requirements after the energy-saving renovations. The actual statistics showed a 66.74% reduction in biomass fuel consumption per unit temperature difference after the renovations, indicating a significant improvement in energy efficiency.
Research Progress on the Treatment of High-Concentration Nitrogen and Phosphorus Wastewater by Struvite Precipitation
Authors: Liu Yi , Zhang Rongxin , Wei Liang , Su Yang , Fu Jinxiang
Published: July 2023

Aiming at the problems of eutrophication of water bodies and the shortage of phosphorus resources, the struvite method for treating high-concentration nitrogen and phosphorus-containing wastewater has been widely used because of its high efficiency and low consumption. This paper summarizes the research progress on the treatment efficiency, influencing factors and stability of high concentration nitrogen and phosphorus mixed wastewater in recent years, and on this basis, the feasibility and development prospect of MAP method in the treatment of high concentration nitrogen and phosphorus wastewater are proposed.
Research on Risk Assessment Model of Light Pollution and Countermeasure Based on AHP Combined with TOPSIS
Authors: Yang Yixuan , Sun Haiyi , Xiong Jianyang , Zhang Qingchen , He Jiao
Published: July 2023

With the development of human society, light pollution has gradually become one of the major problems faced by today’s society. In order to improve human awareness of the impact of light pollution and reduce the impact of light pollution, we constructed a “light pollution risk assessment” model and proposed relevant strategies to mitigate the impact of light pollution. We established a 3-level Analytical Hierarchy Process (AHP) combined with Technique for Order Preference by Similarity to an Ideal Solution (TOPSIS) model by dividing into three major factors: economic, social, and natural, and selected each index to take data collection and data analysis, then the determination of weights among factors in the model was carried out by entropy weighting method, and the light pollution risk level assessment model was obtained by K-clustering analysis. The model can systematically assess and classify the risk level of light pollution in the investigated area, which is conducive to the establishment of a scientific system for the evaluation and prevention of urban light pollution in the future, and propose effective countermeasures for how to reduce urban light pollution.
Study on Water Purification Efficiency and Influencing Factors of a Constructed Wetland in Jiaxing
Authors: Han Shengsheng , Wu Lijun , Li Junjie , Li Jianfeng , Zhou Qiang , Chen Fenfei , Li Tianfei , Li Jianhang
Published: July 2023

Constructed wetland plays an important role in the removal of micro-polluted water pollutants in urban water sources. However, the water purification capacity and influencing factors of the constructed wetlands still need to be explored. This study monitored the turbidity, ammonia nitrogen (NH3-N), dissolved oxygen (DO), and chemical oxygen demand (COD) at the water inlet and outlet of Shijiuyang Wetland in Jiaxing City from 2019 to 2021. The results showed that the turbidity and the wetland turbidity removal rate stayed high. The DO couldn’t meet national standard III for surface water during the high temperature time in summer, and NH3-N and COD are stable within national standard III. The partial regression analysis shows that the addition of chemicals is the most important factor affecting the turbidity. Temperature had the most important affect to NH3-N and DO, the higher the temperature, the lower the NH3-N value and the DO. The flow rate is the most important factor affecting the COD, the higher the flow rate, the lower the COD. Moreover, this paper proposes operation and maintenance improvement measures for the problem of excessive turbidity and DO in Shijiuyang Wetland. The research results are conducive to improving the understanding of water security in the Yangtze River Delta region.
Water Purification Capacity of the Constructed Wetland to Micro-Pollution Water Source —— a Case Study in Jiaxing
Authors: Han Shengsheng , Qu Zelong , Li Junjie , Su Yuezong , Jia Juanhua , He Wenhao , Zhang Kaixin , Li Huabin
Published: July 2023

Constructed wetlands are commonly applied to improve and maintain water quality of micro-polluted water sources as a feasible and cost-effective technique. However, the purification capacity of the constructed wetland for micro-polluted water was lacking of understanding. This study collected the turbidity, ammonia nitrogen (NH3-N), nitrite nitrogen (NO2-N), total nitrogen (TN), Fe, Mn, total phosphorus (TP), permanganate index (CODMn), dissolved oxygen (DO), and chemical oxygen demand (COD) at the water inlet and outlet of Guanjinggang Wetland in Jiaxing City from 2019 to 2021. The comparisons among the pollution indicators showed that the wetland reduced the pollutions and slowed down the fluctuations of pollution indicators, except for Do, TN and COD. The removal rates are different due to the causes of pollution indicators. The partial regression analysis to different influencing factors showed the water temperature were the main influencing factor to the turbidity, NH3-N, Fe with the partial correlation of 0.447, -0.631, 0.510, respectively. Precipitation showed the highest influence on Mn with the partial correlation of 0.323. Flow showed highest influence on COD with the partial correlation of -0.339. Both flow and water temperature were the highest influence factors on No2-N, CODMn, Do and TN. However, water purification agent was not the main influence factor on any pollution indicators. The research results are conducive to improving the understanding of water security in the Yangtze River Delta region.
Performance and Operation Strategy Analysis of BEST Cycle 1000MW Double Reheat unit under Different Operating Conditions
Authors: Ji Fengjun , Wang Heng , Jiao Dong , Li Linxuan , Qi Jinsheng , Li Lin , Li Yanteng , Cao Xuankai , Gao Yan
Published: July 2023

Improving steam parameters in a coal-fired power unit boosts cycle efficiency, lowers coal consumption, and reduces emissions. The backpressure extraction steam turbine (BEST) cycle addresses the problem of excessive superheating of extraction steam. This study analyzed a 1000 MW double reheating unit, finding that heat rate in the conventional and BEST cycle systems is heavily influenced by load under THA conditions. At 100% and 75% loads, the BEST cycle’s heat rate decreases but increases at 50% load. For safe operation during flow interruption and high load rates, a pairwise grouping method is recommended for high-pressure heater interruption. When multiple low-pressure heaters are simultaneously cut off, the unit load needs to be limited based on the number of heaters being removed. when multiple low-pressure heaters are simultaneously cut off, the unit load needs to be limited based on the number of heaters being removed. Removing two low-pressure heaters lowers the load to 90%, and three lowers it to 80%. These findings optimize the thermal system’s parameters and enhance overall efficiency.
Research on Water Control and Production Enhancement Process in TY Gas Field
Authors: Jiang Siyuan , Feng Jiazhi , Xuan Yinglong , He Jingang , Yu Fahao
Published: July 2023

In order to solve the problem of water intrusion seriously affecting the development of each production well in TY gas field, a numerical model was established with reference to well X in TY gas field to study the characteristics of water intrusion in TY gas field, and four sets of water control and production increase experiments were completed, including elastic extraction experiment, water plugging experiment, side drilling experiment and combined water plugging and side drilling process experiment, which were verified by physical experiments on this basis. The results show that different water control and production enhancement measures have different effects, among which the combination of water plugging and lateral drilling process has the best effect, which can increase the gas production by 84.1%, and the error between the physical experiment results and the numerical simulation results is 7.7%.
Experimental Study on Ecological Restoration of Glycyrrhiza Uralensis in Yulin Sandy Grassland
Authors: Wang Rui , Li Qiang , Ren Shuaifeng , Wang Sitong
Published: July 2023

Aeolian sandy grassland area is the main geomorphic type in the north of Yulin. The ecological environment is fragile and the problem of desertification is serious, which needs to be controlled urgently. The introduction of herbs is considered to be an effective means to control the sandy beach area. In this paper, licorice was selected as the indicator crop, and the introduction performance of licorice under different treatments in Yulin Sandy Grassland was observed through field experiment. The results show that: (1) after treatment, the physical structure of aeolian sandy soil is effectively improved. Compared with the control, the moisture content, temperature and porosity of aeolian sandy soil increased in varying degrees, which were 31.62%, 5.12% and 5.26% respectively, and the soil bulk density decreased by 4.08%. (2) After treatment, the chemical structure of aeolian sandy soil was significantly improved, the electrical conductivity, soil organic matter and nutrients were significantly increased, which were 22.63%, 21.09% and 4.66% respectively, and the pH decreased by 2.51% compared with the control group. (3) The treatment group could effectively improve the plant height, rejuvenation rate and coverage of Glycyrrhiza uralensis by 14.95%, 29.79% and 41.40% respectively.
Comprehensive Evaluation of Surface Water Quality in the Flood Period of the Yellow River by Various Methods and Theories
Authors: Yu Zhen Zhen , Zhang Shi Kun , Yang Yu Xia , Zhang Ga , Yan Li
Published: July 2023

Field monitoring of water quality during the autumn flood season in the middle and lower reaches of the Yellow River in 2021 was carried out. During this period, a host of methods, including the single-factor evaluation method, index evaluation method, and fuzzy mathematics method, were utilized to evaluate the water quality status. The relevant findings indicate that the water quality of the mainstream and tributaries in the middle and lower reaches of the Yellow River in the autumn flood season is excellent, which meets the water function zoning and water quality goals. In particular, the single-factor evaluation method emphasizes the use of the single index with the most serious pollution to represent the comprehensive water quality category, whereas the fuzzy mathematics method uses the multi-factor contribution rate to calculate the membership degree of water quality. Therefore, it is superior to the single-factor evaluation method in determining the water quality of the water functional zones within the evaluation scope. Meanwhile, the Nemerow index of the water quality of the tributaries of Yiluo River and Qinhe River at the section entering the Yellow River is lower than that of the mainstream, indicating that the water quality of tributaries is better than that of the mainstream during the monitoring period. Overall, the results of this research are conducive to the objective evaluation of the water quality of the Yellow River during the autumn flood season, thus providing more scientific technical support for the ecological conservation and restoration of the Yellow River basin.
Eco-Livability Assessment of a Newly Emerging Urban Subcenter in Shanghai: A Climatic Perspective
Authors: Ma Yue , Wu Ruixi , Zhao Jiewei , Shi Cheng , Yang Hanwei , Shi Jun , Shen Zhongping , Yang Hequn
Published: July 2023

Global warming and rapid urbanization are changing the livability of cities. The eco-livability (EL) in Jiading, a newly emerging urban sub-center in the northwestern part of Shanghai megacity, is assessed from a climatic perspective, by composing an EL index consisting of meteorological hazards, human comfort, vegetation ecology, and air quality, based on multi-source observations. The results show that the EL in Jiading has improved with the restoration of green spaces and the reduction of air pollution. However, with the rising risk of weather extremes (e.g., heat waves, rainstorms) brought by the warming world, the EL in Jiading is being undermined. We should take preventive measures to improve our ability to resist climate risks.
Distribution of PCDD/F and PCB at Different Positions of Circulating Fluidized Bed Municipal Solid Waste Incinerators
Authors: Dou Yajun , Zhang Mengmei , Yan Shubin , Luo Yunxia
Published: July 2023

Because of a high moisture content and a low heating value of Chinese municipal solid waste (MSW), circulating fluidized bed (CFB) incinerators have been widely adopted in China for incinerating MSW since 1998. In this study, two typical CFB incineration plants (A and B) were investigated for contents and fingerprints of PCDD/F and PCB at different positions downstream their post-combustion zone, aiming to draw a full picture of formation and distribution of these organochlorinated pollutants. Both flue gas and ashes were sampled at five different positions of Plant A, from high-temperature superheater to outlet of baghouse filter, representing a huge range of flue gas temperatures; for Plant B, five ash samples were collected at different positions of the waste heat boiler (from high-temperature superheater to lower economizer). A continuous increase in contents of PCDD/F and PCB in flue gas was observed from superheater to inlet of air pollution control system (APCS) in Plant A, with the most significant rise noticed at air preheater. The load of PCDD/F and dioxin-like PCB in ashes also amplified steadily along the cooling path of flue gas in both plants. Changes in formation pathways are discussed based on homologue and isomer distribution patterns.
Research Progress and Trend Analysis of Soil Inorganic Carbon Sink Based on Citespace
Authors: Ling Ling , Jiao Yan , Yang Wenzhu , Wang Yan
Published: July 2023

To comprehensively understand the research status and development trend of soil inorganic carbon development, this study comprised 441 inorganic carbon pool papers from 1991-2022 in the Web of Science database based on CiteSpace software, and conducted Visualization analysis to explore the research hotspots, research status and development trend in this field. The results show that number of publications has increased year by year, and the clustering results show that the research topics mainly involve terrestrial biosphere, coastal forest ecosystem, forest soil, changed temperature hutrient. The hotspots of research include the blue carbon, soil carbon sequestration and dissolution processes of inorganic carbon. In addition, development trend include the effects of land use change, temperature, organic matter and other changes. soil inorganic carbon sinks, carbon dioxide uptake and the application of isotope technology are the ongoing concerns in this field, which will be the hotspot of soil inorganic carbon sink research in the future period.
A Preliminary Study on the Research and Development of Digital Soil and Water Conservation Intelligent Management Platform -- Taking Anji County as an example
Authors: Liu Kejun , Qiu Tao , Tian Gang , Wang Ran , Liu Mengru
Published: July 2023

In order to comprehensively improve the digital level of soil and water conservation in Anji County, it is necessary to realize the "one map management" of soil and water conservation by the information sharing and interaction among multiple government departments. With the new generation of information technologies such as big data, digital twin, artificial intelligence and virtual reality, use "11143" as the construction framework, improve the data warehouse of soil and water conservation to achieve "one map management" of the whole life cycle of production and construction projects; monitor soil erosion in real time through satellite remote sensing data and provide early warning and forecasting; and dock with the national "double carbon" strategy to build a carbon sink management system for soil and water conservation. It is expected to be built into a water and soil conservation wisdom management platform that meets multiple business application scenarios such as supervision of production and construction projects, dynamic monitoring and comprehensive management of soil erosion, wisdom decision making and application, and industry promotion services.
Indoor Thermal Environment Test of Six Prism Terrace Greenhouse
Authors: Zhao Qingqing , Wang Ruoyu
Published: July 2023

Solar greenhouse occupies a large proportion of greenhouse types in China and is the most widely used agricultural facility in northern China. The application of solar greenhouse in agriculture is mainly to cultivate fruits, vegetables and flowers, and the bottom surface of greenhouse is mainly rectangular. So in this paper, based on regular hexagon, a greenhouse with hexagonal structure is designed, and a miniature model is constructed according to the scale. Then select some reasonable components and install them inside the structure for temperature test. By measuring the temperature inside the greenhouse at a fixed point, the temperature change inside the greenhouse in a day is obtained. Through the analysis of the longitudinal temperature comparison and the horizontal temperature field inside the greenhouse, the rationality of the structure model is verified.
Application of Riverbank Integrated Super-Magnetic Separation in River Water Environment Management
Authors: Wu Lijun , Zhou Wenming , Li Shiyi , Yan Qiao , Zhang Baohua
Published: July 2023

Riverbank integrated super-magnetic separation (ISMS) played an important role in river water (RW) environment management when the diminishing of suspension is a major task. This paper provides a comprehensive analysis of its operation performance from the perspective of pollutant controlling and carbon mitigation potential using the method proposed by intergovernmental panel on climate change. The results showed that turbidity of discharge from ISMS is maintained below 3 NTU and total phosphate removal above 85%. From ISMS to sludge dewater and final incineration, the net carbon emission can is negative at -0.07 kgCO2/m3RW thanks to incineration with combined heat and power generation and cement substitute by slag. The indirect carbon emission associated with the use of PAC and PAM contributed 79% of the total emissions which amounted to 0.087 kgCO2/m3RW. Future work is suggested on accurate dosing adjustment for cost reduction and carbon mitigation.
Transformation Pathways of China's Power Sector in the Context of "Carbon Peaking and Carbon Neutrality"
Authors: Yuan Bo , Xia Peng , Chen Haitao , Wu Cong , Sun Guangzeng
Published: July 2023

To achieve the "carbon peak" and "carbon neutrality" goals, the power industry is the main battlefield and main force. Compared with the long carbon reduction path after natural peak in major European and American countries, the carbon peak, plateau period, and transformation path under the "dual carbon" goal in China will be completely different. This article establishes a multi-scenario analysis framework for the transformation path of the power industry under the "dual carbon" goal, and constructs three major scenarios. It analyses the low-carbon transformation path of power system including power source structure and carbon emissions under different scenarios and proposes policy recommendations.
Autologous Platelet Gel Applications During Cardiovascular Surgery: Effect on Wound Healing
Authors: Englert Susan J. , Estep Thomas H. , Ellis-Stoll Cynthia C.
Published: July 2023

Abstract: Autologous platelet gel (APG) was developed in the early 1990s as a byproduct of platelet-rich plasma sequestration during cardiac surgery. Although APG has been approved for postoperative healing, there have been no published studies that evaluate the effects of APG on sternal healing postcardiopulmonary bypass. The purpose for this study was to examine the effects of APG on postoperative sternal wound healing evidenced by subjective reports of chest and leg pain, the amount of measurable bruising incurred, and platelet indices both preoperatively and postoperatively.
Partial Bowls Using the Haemonetics Cell Saver 5: Does It Produce a Quality Product?
Authors: Serrick Cyril J. , Scholz Mary
Published: July 2023

Controversy still exists on the validity of processing a partial bowl during the collection of shed blood lost through surgery during cell salvaging. The purpose of this study was to assess the quality of red blood cells produced from a partial bowl of autologous suctioned blood using the Haemonetics Cell Saver 5. Suctioned blood was collected from 17 patients undergoing cardiac surgery. A partially filled cell saver bowl was washed with 1500 mL of NaCl. Reservoir and processed blood samples were examined for potassium, leukocytes, hematocrit, platelets, and plasma-free hemoglobin and then compared with 22 previously studied full bowls. Results are summarized in the table below:

In conclusion, the Haemonetics Cell Saver 5 can produce a quality product from washing a partial bowl with a better washout of white blood cells compared with a full bowl. However, there is a reduction in red blood cell recovery.
A Description of a Prototype Miniature Extracorporeal Membrane Oxygenation Circuit Using Current Technologies in a Sheep Model
Authors: Terry Bryan , Gunst Gordy , Melchior Richard , Wolfe David , Feocco Nancy , Graham Susan , Searles Bruce , Darling Edward
Published: July 2023

In the United States, standardization of neonatal extracorporeal membrane oxygenation (ECMO) circuit was achieved during the 1980s. Since that time, the consoles and components of the ECMO circuit have remained fundamentally unchanged (bladder, rollerpump, silicone membrane oxygenator). Extracorporeal technology, however, has witnessed many significant advancements in components during the past two decades. These new technologies have characteristics that may improve outcomes when applied in the ECMO arena. Understanding how these technologies perform in long-term applications is necessary. Therefore, the purpose of this project is to evaluate the performance of a miniature ECMO circuit consisting of current generation technologies in an animal model. An ECMO circuit (prime volume 145 mL) was designed that included a hollow fiber oxygenator and a remote mounted centrifugal pump. All circuit tubing and components were surface coated. Three sheep (approx 13 kg) were placed on ECMO using standard neck cannulation techniques and maintained according to clinical protocols. Technical implementation, oxygenator function, and hematological parameters were accessed. Duration of ECMO was 20, 48, and 58 hours. There was no evidence of oxygenator failure, as measured by pressure drop and oxygen transfer, in any of the procedures. No plasma leak was observed in any oxygenators. Platelet count trended downward after 24 hours. Visual inspection after ECMO showed very little evidence of gross thrombosis. This ECMO circuit design departs dramatically from the typical North American systems. The use of this console and components facilitated a 70% reduction in priming volume over a traditional ECMO circuit. Further investigations should be conducted to determine if circuit miniaturization can reduce the morbidity associated with blood product consumption and the bloods contact with the artificial surfaces of the ECMO circuitry.