通讯机构：
[Tianyi Chen] D;Department of Architecture, College of Design and Engineering, National University of Singapore, 4 Architecture Drive, 117566 Singapore
摘要：
Low-carbon cities (LCCs) have attracted considerable attention from researchers over the past 15 years as an important initiative for mitigating global warming. The increased pilot LCCs in several countries and focus on theoretical research suggest the need to explore the associated research topics and characteristics, trends, and challenges. An in-depth analysis of literature on LCCs was conducted using the three-phase research involving documents searching, quantitative analyses and qualitative analyses. The quantitative analysis revealed that nearly 70% of LCC research was conducted in three countries. The results of the quantitative analysis also generated a map of term clusters, which identified the 9 major areas. A qualitative analysis of the literature indicated that transition to low-carbon energy is the most intensively researched category, and LCC planning and design dominates the research field. Based on the results of the quantitative and qualitative analyses, this study reports knowledge gaps in the literature and proposes future directions for LCC research in the context of four major trends: LCC planning and design, low-carbon energy transition, low-carbon decision support, and low-carbon management and policy. This study improves the existing knowledge on LCC-related research and pro-vides a future guidance for theoretical research and pilot practices related to LCC.
期刊：
Frontiers in Public Health,2023年11:1152809 ISSN：2296-2565
通讯作者：
Feng, Y.
作者机构：
[Feng, Yan; Wang, Qi] Hunan City Univ, Management Sch, Yiyang, Peoples R China.;[Hu, Ao] Cent South Univ, Local Governance Res Inst, Changsha, Peoples R China.
通讯机构：
[Feng, Y.] M;Management School, China
关键词：
ecological economy;Low-Carbon Economy;Public Health;public spaces in settlements;satisfaction evaluation indicators
摘要：
The propagation characteristics of Airy beams in an inhomogeneous medium with periodic potential are studied theoretically and numerically. The Gross-Pitaevskii equation was solved with periodic potential using the separating variables method, and a breathing soliton solution and the breathing period were obtained. Further, the propagation properties of an Airy beam, and the interaction between two Airy beams while considering the medium parameters and beam parameters were numerically simulated in detail. First, we discuss the influence of the initial medium parameters (modulation intensity P and modulation frequency ?) on the propagation characteristics. Then, we investigate the effect of the initial beam parameters (initial chirp C and position x(0)) on the propagation characteristics. Lastly, the interaction of two Airy beams with opposite spatial positions for different phase f, amplitude A, and initial interval x(0) is analyzed. The breathing period and central position of the breathing solitons could be controlled by changing the initial medium parameters. By varying the initial beam parameters, the deflection direction and size, and the maximal intensity of the breathing solitons were manipulated. The breathing solitons of different bound states were formed by changing the phase f, amplitude A, and initial interval x(0) of two Airy beams. The results provide a theoretical basis for the propagation and manipulation of Airy beams.
作者机构：
[Tang, Hui; Ao, Rongjun; Zhou, Xiaoqi; Aihemaitijiang, Yierfanjiang; Chen, Jing] Cent China Normal Univ, Key Lab Geog Proc Anal & Simulat Hubei Prov, Wuhan, Hubei, Peoples R China.;[Tang, Hui; Ao, Rongjun; Zhou, Xiaoqi; Aihemaitijiang, Yierfanjiang; Chen, Jing] Cent China Normal Univ, Coll Urban & Environm Sci, Wuhan, Hubei, Peoples R China.;[Tang, Hui] Hunan City Univ, Sch Architecture & Urban Planning, Yiyang, Hunan, Peoples R China.
通讯机构：
[Aihemaitijiang, Y ] C;Cent China Normal Univ, Key Lab Geog Proc Anal & Simulat Hubei Prov, Wuhan, Hubei, Peoples R China.;Cent China Normal Univ, Coll Urban & Environm Sci, Wuhan, Hubei, Peoples R China.
摘要：
High-quality regional development should be promoted by facilitating inter-regional mobility of heterogeneous labor force to optimize its spatial allocation. This study incorporates skill relatedness into spatial categorization and selection effects, and explores how skill-relatedness affects the location choice of heterogeneous labor force. To do so, we use labor force migration data and employee data by occupation subcategory from the 2000 National Population Census and 2015 National Population Sample Survey. The empirical evidence provides three major findings. First, there are significant regional differences in labor migration rates by the occupational group between cities in China, and the trend is increasing. Regional concentration of location choice is increasing and six significant agglomerations are formed. Second, skill relatedness positively affects the location choice of the heterogeneous labor force in Chinese cities. When cities' skill-relatedness is more robust, influence on labor location choice is more remarkable. In cities with high-size classes, the effect of high-skill relatedness on labor location choice is higher. Third, labor force with solid skill relatedness with regional employment moves to the location owing to the spatial sorting effect. Labor force without skill relatedness or weak relatedness moves out or does not move to the location owing to the spatial selection effect.
期刊：
JOURNAL OF WATER AND CLIMATE CHANGE,2023年14(10):3447–3459. ISSN：2040-2244
通讯作者：
Qiu, ZJ
作者机构：
[Liao, Wei; Luo, Rihui; Liu, Yunyi; Qiu, Zhenjie; Sun, Mengying; Qiu, ZJ] Hunan City Univ, Hunan Engn Res Ctr Struct Safety & Disaster Preven, Yiyang 413000, Peoples R China.;[Qiu, Zhenjie; Qiu, ZJ] Hunan City Univ, Hunan Village Drinking Water Qual Safety Engn Res, Yiyang 413000, Peoples R China.
通讯机构：
[Qiu, ZJ ] H;Hunan City Univ, Hunan Engn Res Ctr Struct Safety & Disaster Preven, Yiyang 413000, Peoples R China.;Hunan City Univ, Hunan Village Drinking Water Qual Safety Engn Res, Yiyang 413000, Peoples R China.
摘要：
In the soil column experiments, the irrigation amount varied from 4.8 to 12 L, and the nitrogen application rate was from 80 to 360 kg ha(-1). Three fertigation strategies were tested. The results indicated that an increase in water input led to an increase in the area of pH decrease in the soil at 10 days after the irrigation ended for a given lateral depth of 10 cm. The measurement of nitrogen distribution showed that the nitrogen content in the soil was significantly increased with the nitrogen application rate. Fertigation strategies substantially affect the pH and nitrogen distributions in soil. The strategy of applying water at first for one-fourth of the total irrigation time (1/4W), then applying fertilizer solution for one-half of the total irrigation time (1/2N), followed by applying water for the remaining one-fourth of the total irrigation time (1/4W) made a minimal soil pH decreasing area and a homogeneous nitrate distribution at 0-20 cm depth. Therefore, to reduce NO3-N leaching and avoid deep soil acidification, a dripline depth of 10 cm with an irrigation amount of 4.8 L and a nitrogen application rate of 80 kg ha(-1) through the 1/4W-1/2N-1/4W fertigation may be suggested.
关键词：
fluvial process;climate change;Late Quaternary;upper Huaihe River
摘要：
Research into river processes in different climatic and geomorphic areas is vital for a clearer understanding of the non-linear responses of rivers to climate change. The Huaihe River (HHR) Basin, located in China's North-South Transition Zone (NSTZ), provides an ideal environment in which to explore river responses to climate change within a humid/semi-humid transitional area. Based on optically stimulated luminescence (OSL) and C-14 dating, combined with sedimentary stratigraphic analyses, we reconstructed the river processes of three sedimentary sequences in the upper HHR since the Late Quaternary. Our results showed that the upper HHR was characterized by aggrading meandering channels from the Last Glacial Maximum (LGM) to 0.5 ka, and an aggrading wandering channel from 0.2 ka to the present. Two periods of downcutting occurred during 5.8-3.0 and 0.5-0.2 ka, respectively. The river incision is potentially linked to changes in the climate during the Mid-Late Holocene transition and the Little Ice Age (LIA). However, there have been no marked changes in channel patterns in the upper HHR since the LGM. This phenomenon reflects the influence of vegetation on channel patterns during climate change. Our results showed that the fluvial processes in different climatic and geomorphic areas are controlled by the local hydroclimatic regime.
作者机构：
[Qiu, Zhenjie; Qiu, Liang; Sun, Mengying; Tang, Zhenwen] Hunan City Univ, Hunan Engn Res Ctr Struct Safety & Disaster Preven, Yiyang, Peoples R China.;[Qiu, Zhenjie; Sun, Mengying] Hunan City Univ, Hunan Village Drinking Water Qual Safety Engn Res, Yiyang, Peoples R China.;[Hou, Xiaoli] Hunan Sany Polytech Coll, Changsha, Peoples R China.;[Hou, Xiaoli] Hunan Agr Univ, Changsha, Peoples R China.;[Qiu, Zhenjie] Hunan City Univ, Hunan Engn Res Ctr Struct Safety & Disaster Preven, Yiyang 413000, Peoples R China.
通讯机构：
[Zhenjie Qiu; Zhenjie Qiu Zhenjie Qiu Zhenjie Qiu] H;Hunan Engineering Research Center of Structural Safety and Disaster Prevention for Urban Underground Infrastructure, Hunan City University, Yiyang, China<&wdkj&>Hunan Village Drinking Water Quality Safety Engineering Research Center, Hunan City University, Yiyang, China
关键词：
emitter discharge rate;irrigation level;lateral depth;microirrigation;soil acidification;Micro-irrigation;Taux de débit de buse individuelle;Profondeur latérale;Niveau d'irrigation;Acidification du sol
摘要：
Abstract Accelerated soil acidification from excessive nitrogen fertilizer use and unreasonable irrigation has seriously increased. The advantages of saving water and fertilizer make drip irrigation feasible for reducing soil acidification. However, it is still unknown how drip irrigation influences the distribution of pH in the soil. Experiments were conducted in 30° wedge‐shaped plexiglass containers to study the transformation of nitrogen and the distribution of pH in the soil profile under subsurface drip irrigation. The apparent cylindrical water application rate varied from 4.8 to 12 L, the emitter discharge rate varied from 1.8 to 5.5 L/h, and the lateral depth ranged from 0 to 20 cm. Ten days after irrigation ended, a lateral depth of 20 cm noticeably reduced soil pH at a depth of 10–40 cm, while the pH at a shallow lateral depth decreased in the topsoil; similarly, an emitter discharge rate of 1.8 L/h significantly decreased soil pH at a depth of 0–40 cm, while the pH with a greater emitter discharge rate was slightly decreased in the topsoil. Furthermore, an increase in the application rate resulted in an increase in the area of pH decrease in the soil at 10 days after irrigation ended. Additionally, the growing nitrogen application rate significantly increased the nitrogen content in the soil profile, and the potential risk of deep‐soil pH declined. To reduce NO3‐N leaching and avoid deep‐soil acidification, a dripline depth of 10 cm with a minor irrigation level and nitrogen application rate through an emitter discharge rate of 3.2 L/h may be suggested. Résumé L'acidification accélérée des sols due à l'excès d'engrais azotés et à une irrigation déraisonnable a sérieusement augmenté. Les avantages de l'économie d'eau et d'engrais rendent l'irrigation goutte à goutte possible pour réduire l'acidification des sols. Cependant, on ne sait toujours pas comment l'irrigation goutte à goutte influence la répartition du pH dans le sol. Des expériences ont été menées dans des conteneurs en plexiglas en forme de coin à 30° pour étudier les transformations de l'azote et la répartition du pH dans le profil du sol sous irrigation souterraine goutte à goutte. Le taux d'application d'eau cylindrique apparent variait de 4,8 à 12 L, le taux de débit de buse individuelle variait de 1,8 à 5,5 L/h, et la profondeur latérale variait de 0 à 20 cm. Dix jours après la fin de l'irrigation, une profondeur latérale de 20 cm a sensiblement réduit le pH du sol à des profondeurs de 10–40 cm, tandis que le pH à une faible profondeur latérale a diminué dans la couche arable; de même, un taux de débit de buse individuelle de 1,8 L/h a significativement diminué le pH du sol à une profondeur de 0–40 cm, tandis que le pH avec un taux de débit de buse individuelle plus élevé a légèrement diminué dans la couche arable. En outre, une augmentation du taux d'application a entraîné une augmentation de la zone de diminution du pH dans le sol 10 jours après la fin de l'irrigation. En outre, le taux croissant d'application d'azote a augmenté de manière significative la teneur en azote dans le profil du sol, et le risque potentiel de pH du sol profond a diminué. Pour réduire le lessivage de NO3‐N et éviter l'acidification profonde du sol, une profondeur de 10 cm de la ligne de goutte à goutte avec un niveau d'irrigation inférieur et un taux d'application d'azote à travers un taux de débit de buse individuelle de 3,2 L/h peut être proposé.
作者机构：
[Xue, Yun; Huang, Changjun; Cao, Yuanzhi; Liu, Fenliang] Hunan City Univ, Sch Municipal & Surveying Engn, Yiyang 413000, Peoples R China.;[Zhou, Lv] Guilin Univ Technol, Sch Geomat & Geoinformat, Guilin 541004, Peoples R China.;[Liu, Zhong] Hunan Remote Sensing Geol Survey & Monitoring Inst, Changsha 411000, Peoples R China.
通讯机构：
[Changjun Huang] S;School of Municipal and Surveying Engineering, Hunan City University, Yiyang 413000, China<&wdkj&>Author to whom correspondence should be addressed.
摘要：
Dam deformation monitoring data are generally characterized by non-smooth and no-saturated S-type fluctuation. The grey Verhulst model can get better results only when the data series is non-monotonic swing development and the saturated S-shaped sequence. Due to the limitations of the grey Verhulst model, the prediction accuracy will be limited to a certain extent. Aiming at the shortages in the prediction based on the traditional Verhulst model, the optimized grey Verhulst model is proposed to improve the prediction accuracy of the dam deformation monitoring. Compared with those of the traditional GM (1,1) model, the DGM (2,1) model, and the traditional Verhulst (1,1) model, the experimental results show that the new proposed optimized Verhulst model has higher prediction accuracy than the traditional gray model. This study offers an effective model for dealing with the non-saturated fluctuation sequence to predict dam deformation under uncertain conditions.
期刊：
JOURNAL OF ORGANIC CHEMISTRY,2023年88(20):14697-14707 ISSN：0022-3263
通讯作者：
Chen, Shanping;Deng, GJ
作者机构：
[Quan, Siying; Fang, Fang; Xia, Jie; Chen, Shanping; Deng, Guo-Jun; Chen, SP; Deng, GJ] Xiangtan Univ, Key Lab Green Organ Synth & Applicat, Key Lab Environm Friendly Chem & Applicat, Coll Chem,Minist Educ Hunan Prov, Xiangtan 411105, Peoples R China.;[Fang, Fang] Hunan City Univ, Coll Mat & Chem Engn, Yiyang 413000, Peoples R China.;[Deng, Guo-Jun; Deng, GJ] Henan Normal Univ, Sch Chem & Chem Engn, Xinxiang 453007, Peoples R China.
通讯机构：
[Chen, SP; Deng, GJ ] X;Xiangtan Univ, Key Lab Green Organ Synth & Applicat, Key Lab Environm Friendly Chem & Applicat, Coll Chem,Minist Educ Hunan Prov, Xiangtan 411105, Peoples R China.;Henan Normal Univ, Sch Chem & Chem Engn, Xinxiang 453007, Peoples R China.
摘要：
A facile and practical approach for the preparation of substituted pyrimidines from ketones, NH4OAc, and N,N-dimethylformamide dimethyl acetal has been described. This NH4I-promoted three-component tandem reaction affords a broad range of substituted pyrimidines in acceptable yields under metal- and solvent-free conditions. The present methodology features the advantages of simple and easily available starting materials, metal- and solvent-free conditions, a broad substrate scope with good functional group tolerance, and gram-scale synthesis.
期刊：
Sustainable Energy Technologies and Assessments,2023年57:103230 ISSN：2213-1388
通讯作者：
Mohamed Salem
作者机构：
[Peng, Li] Key Laboratory for Energy Monitoring and Edge Computing of Smart City, Hunan City University, Yiyang 413002, China;[Salem, Mohamed] School of Electrical and Electronic Engineering, Universiti Sains Malaysia (USM), Nibong Tebal, 14300 Penang, Malaysia;[Blazek, Vojtech; Prokop, Lukas; Misak, Stanislav] ENET Centre, VSB—Technical University of Ostrava, 708 00 Ostrava, Czech Republic;[Al-Bahrani, Mohammed] Chemical Engineering and Petroleum Industries Department, Al-Mustaqbal University College, Babylon 51001, Iraq
通讯机构：
[Mohamed Salem] S;School of Electrical and Electronic Engineering, Universiti Sains Malaysia (USM), Nibong Tebal, 14300 Penang, Malaysia
关键词：
Solar water heaters;Renewable energy;Buildings;Thermal energy storage;Phase change material (PCM)
摘要：
Fossil fuel usage for heating applications must be reduced considering the issues related to the environment and the restriction of their resources. In this regard, attention is devoted to renewable energy sources to supply the energy requirements of different sectors. In the building sector, solar energy is harnessed for heating and cooling. Solar energy is applicable both directly and indirectly for heating using different technologies. The intermittent nature of solar energy obliges the use of storage units to make the solar systems applicable at night hours or during periods the low solar intensity. Various thermal energy storage materials have been utilized in different kinds of solar heaters to stabilize their performance, improve their reliability, and avoid issues related to variations in solar radiation. In this article, studies on the usage of thermal energy storage units in solar water heaters are reviewed and their key results are reflected. As one of the main conclusions of the reviewed works, it can be denoted that several factors such as the operation condition and characteristics of the storage unit are effective on the function of the systems combined with the thermal storage component. Aside from an increment in the operating hours of solar heaters, usage of storage units can boost both energy and exergy efficiencies. Furthermore, the study denotes that the power saving rate is influenced by the abundance of solar energy resources. In addition, it could be denoted that the performance of the systems is improvable by employing some ideas, such as the application of nanotechnology in storage materials.
期刊：
Open Life Sciences,2023年18(1):- ISSN：2391-5412
通讯作者：
Zhiyuan Hu
作者机构：
[Zhou, Xiaohong; Liu, Shiquan; Yu, Songlin; Liu, Zhanjun; Li, Taotao] Hunan City Univ, Dept Hunan Prov Key Lab Dark Tea & Jinhua, Yiyang 413000, Hunan, Peoples R China.;[Hu, Zhiyuan] Hunan City Univ, Dept Hunan Prov Key Lab Dark Tea & Jinhua, 518 Yingbin Rd, Yiyang 413000, Hunan, Peoples R China.;[Zhang, Xuemao; Cai, Hongmei] Yiyang Guan Longyu Dark Tea Dev Co Ltd, Yiyang 413000, Hunan, Peoples R China.
通讯机构：
[Zhiyuan Hu] D;Department of Hunan Provincial Key Lab of Dark Tea and Jin-hua, Hunan City University, No. 518 Yingbin Road, Yiyang City, Hunan Province, 413000, China
关键词：
Fuzhuan tea;processing technique;high-throughput sequencing;bacterial community structure
摘要：
The composition and diversity of microbial communities are of considerable significance to the quality development of Camellia sinensis (Fuzhuan tea). In this study, we examined differences in the bacterial community structures of loose, lightly-pressed, hand-made, and machine-pressed Fuzhuan teas and raw dark tea. We observed notable differences in the bacterial communities of the five groups, where there were only 51 consensus sequences. ASV/OTU Venn diagram, Chao1, Ace, Simpson indices, and dilution curve analyses consistently revealed that machine-pressed tea exhibited the highest bacterial diversity. Taxonomically, Actinobacteria, Firmicutes, Proteobacteria, and Cyanobacteria were the dominant bacterial phyla in each group, whereas Corynebacterium, Methylobacterium, and Bifidobacterium were the dominant genera. Our findings revealed significant differences in the bacterial community structures of different Fuzhuan tea products derived from the same raw material, with bacterial diversity rising with increased product compaction.
摘要：
Sulfur dioxide (SO(2)) derivatives are extensively utilized as both a preservative for foods and an active gaseous signal molecule in various physiological and pathological processes, but their excessive intake would bring harmful effects on human health; so, the determination of SO(2) derivatives is of great importance. Herein, we developed a ratiometric fluorescent probe named 2-(2'-hydroxyphenyl)benzothiazole-3-ethyl-1,1,2-trimethyl-1H-benzo[e]indolium (HBT-EMBI) by introducing a hemicyanine unit of EMBI to an HBT group for the detection of SO(2) derivatives via an excited-state intramolecular proton transfer (ESIPT) and intramolecular charge transfer (ICT) effects. The probe displays some advantages, such as a colorimetric change from purple to colorless, a ratiometric fluorescence with zero cross-talk, and a remarkably large emission shift (Δλ = 164 nm) under a single-wavelength excitation. Accordingly, the probe HBT-EMBI has been successfully employed for the colorimetric and ratiometric determination of SO(2) derivatives in real food samples and the quantitative visualization of SO(2) derivative variations in HepG2 cells.
通讯机构：
[Wang, CG ] H;Hunan City Univ, Sch Mech & Elect Engn, Yiyang 413002, Peoples R China.
关键词：
Side milling;ZK61M magnesium alloy;Surface quality;Corrosion resistance properties
摘要：
The milling parameters have an important influence on machining performance and surface quality of metal materials. In this paper, the differences in machining and corrosion resistance properties of ZK61M plates under different processing parameters were analyzed by side milling. The milling process was simulated to explore the change laws of milling temperature and milling force. The hardness of machined surface was examined by Vikers hardness tester. The surface quality and the corrosion performances under different spindle speeds were observed by 3D ultra-depth of field microscope. The results showed that the milling temperature was increased as spindle speed and feed speed increased. The influence of spindle speed and feed speed on milling force along the milling direction and the tool direction was significant different. The milled surface had better quality when the spindle speed increased or the feed speed decreased. The hardness standard deviation of machined surface was decreased as the surface quality became better. Besides, it was summarized how spindle speed played a role in corrosion resistance performance by affecting residual stress and metal oxides.
作者机构：
[Peng, Zhigao; Peng, ZG; Feng, Haoxiong; Xiao, Ming] Hunan City Univ, Coll Civil Engn, Yiyang 413000, Peoples R China.;[Peng, Zhigao; Peng, ZG] Hunan City Univ, Hunan Engn Res Ctr Struct Safety & Disaster Preven, Yiyang 413000, Hunan, Peoples R China.;[Liu, Shenggui] Univ Min & Technol Beijing, Sch Mech & Civil Engn, Beijing 100083, Peoples R China.;[Long, Yanqing] Hunan Tunnel Engn Co LTD, Yiyang 413000, Peoples R China.
通讯机构：
[Peng, ZG ] H;Hunan City Univ, Coll Civil Engn, Yiyang 413000, Peoples R China.;Hunan City Univ, Hunan Engn Res Ctr Struct Safety & Disaster Preven, Yiyang 413000, Hunan, Peoples R China.
摘要：
The occurrence of coalbed methane adsorption-desorption hysteresis has been widely observed, but a unified understanding of its mechanism is lacking, and the factors affecting its degree are unclear. This study introduces a microscale LB model for gas diffusion-adsorption-desorption in porous media that also accounts for the adsorption-desorption hysteresis effect. The accuracy of the model has been validated using previous experimental data, and the primary controlling factors of adsorption-desorption hysteresis were analyzed. The findings are as follows: (1) In the process of methane diffusion-adsorption-desorption, Knudsen diffusion dominates in micro- and mesopores, while viscous flow prevails in macropores; our model can adaptively adjust gas transport regimes across a broad range of pore sizes and pressures. (2) The desorption amount and rate are close relative to the correction factors α and β. A higher α value corresponds to greater initial adsorption as well as longer desorption time, whereas a lower β value implies weaker desorption capacity and a slower desorption rate. (3) Pore size can affect gas diffusion-adsorption-desorption kinetics, where larger pore size corresponds to efficient gas diffusivity; when r < 10 nm, the desorption process is mainly controlled by the desorption rate. Overall, this study has offered new insights into the mechanism behind methane adsorption-desorption hysteresis at the microscale, identified primary controlling factors of methane diffusion-adsorption-desorption process, and provided a foundation for numerical simulations and experiments related to the adsorption-desorption hysteresis.
摘要：
The tea plant is a vital strategic forest resource in China. Dark tea produced from its leaves is an indispensable health-promoting product in western China due to its unique lipid-lowering function. Eurotium cristatum is the dominant strain in Fuzhuan brick tea (a variety of Anhua dark tea) and could produce many functional components, including lovastatin, a lipid-lowering compound. In this study, the lovastatin yield of dark tea was improved by breeding Eurotium cristatum using the protoplast fusion method. The experiments were carried out by inducing a fusion between inactivated Eurotium cristatum JH1205 and Monascus CICC5031. Among the 92 fusants screened the HPLC method, four strains (A4, A36, A54, and A76) with higher lovastatin production (more than three times as high) were obtained. The A76 strain had the highest lovastatin yield, which was 23.93 mu g/mL. The location of the tea forest strongly influenced the lovastatin yield of loose dark tea. The strain bred in this study improved the lovastatin yield of loose dark tea by more than three times when compared to wild Eurotium cristatum. These results are promising for the development of tea forest resources.
摘要：
To investigate the reasonable range of the inclination angle of arch ribs, a spatial finite element method was employed based on a concrete-filled steel tube (CFST) basket-handle through an arch bridge with a span of 360 m. A spatial finite element model was established using Midas/Civil software, which was verified with actual bridge data. The effects of different arch rib inclination angles were investigated under static loads. The structural natural frequencies, linear elastic stability coefficients, internal forces, and displacements were comprehensively considered to determine the reasonable range of the inclination angle. The results show that when the inclination angle ranges between 8 & DEG; and 10 & DEG;, the first, third, and sixth natural frequencies of the structure are increased. It effectively improves the lateral and torsional stiffness of the arch ribs while ensuring optimal out-of-plane stability of the arch ribs. Compared with the parallel arch, the stability is improved by 20.2%. The effects of angle variation on displacement and internal force of the arch ribs were not significant. Considering all indicators, the optimal range of the inclination angle for the arch ribs of 300-m-level highway CFST arch bridges is suggested to be 8 similar to 10 & DEG;.
摘要：
Tetracycline (TC) is an important antibiotic extensively used in livestock breeding and aquaculture, and so an effective removal strategy is urgently needed. This study explores the use of a series of hydroxyapatite calcinated at different temperatures (300, 400, 500, 600, and 700 degrees C) to activate peroxymonosulfate (PMS) for the removal of TC. The optimal conditions for the removal of 10 mg/L TC using hydroxyapatite calcinated at 600 degrees C (CHAP600) as a catalyst were determined to be: pH of 6.0, a catalyst dosage of 0.2 g/L and a PMS concentration of 0.3 mM. Under these conditions, the removal efficiency of TC reached 94 %. The potential degradation pathway of TC was proposed by identifying the intermediates using High Performance Liquid Chromatography/ Triple Quad mass spectrometry. The characterization analysis revealed that the presence of calcium carbonate on the surface of CHAP600 promoted the generation of singlet oxygen (1O2). Additionally, the phosphate group in CHAP600 served as a catalyst for the production of sulfate radicals (SO4 & BULL;-) from PMS, which subsequently react with hydroxyl or surface hydroxyl group to generate hydroxyl radicals (& BULL;OH). And the active species 1O2 is the most significant contributor to the catalytic degradation process of TC by CHAP600 activated PMS, followed by & BULL;OH, and then SO4 & BULL;-. This study provides new insight for the mechanism of removing organic contaminants using PMS activated with calcined hydroxyapatite.
摘要：
In recent years, the provision of applications based on conferencing services over Software-Defined Networking (SDN) is increasing. So far, extensive studies have been conducted on improving conferencing services and supporting high-quality communication in SDN, and the importance of the issue has been understood by the research society. One of the challenges of guaranteeing conferencing services in SDN is the routing of network traffic taking into account Quality of Service (QoS) requirements. Most routing techniques in SDN guarantee end-to-end delay and bandwidth constraints. However, resource loss also plays a role in network performance, where it is clearly neglected in existing works. This study presents a guaranteed Latency-Bandwidth-Loss Routing algorithm based on Fuzzy approach to improve the performance of conference services in SDN (LBLRF). The purpose of the fuzzy-based approach is to increase the number of routed requests and improve the performance of conference services in SDN. LBLRF uses a postponement mechanism to improve the conference service, where it gives higher priority to the requests with low resource demand for connection. In addition, LBLRF is equipped with a hold time mechanism to release the reserved resources after satisfying the request requirements. This mechanism can increase the processing capacity of future requests by conserving network resources. Evaluations have been done by defining several scenarios on a synthetic SDN environment. The results of the experiments show that LBLRF provides a better request acceptance rate between 7% and 16% compared to the best results of existing algorithms.
摘要：
Though building-scale energy demand and indoor thermal comfort have been extensively covered by recent studies, the automation of middle- and larger-scale outdoor microclimate evaluation in parametric design is less covered. The relatively slow computation and the need for sophisticated expertise are some of the current issues. This paper proposes a Rhino–Grasshopper custom script to automatically compute spatial indicators for a quick thermal comfort estimation. The Galapagos evolutionary algorithm is used to optimize thermal comfort and select the best combinations of spatial indicators. In a summer case study located in Shantou, China, the proposed workflow was three times faster than a non-automated indicator calculation in ArcGIS, while the optimization method achieved 25% to 33% reduction in land areas under extreme heat stress. This automated process applies to existing states and new urban designs. It is adaptable to customized prediction models under different climatic zones.
