Delineation of urban growth boundary based on FLUS model under the perspective of land use evaluation in hilly mountainous areas

With rapid economic development,the size of urban land in China is expanding dramatically.The Urban Growth Boundary(UGB)is an expandable spatial boundary for urban construction in a certain period in order to control the urban sprawl.Reasonable delineation of UGB can inhibit the disorderly spread of urban space and guide the normal development of the city.It is of practical significance for the construction of green urban space.The study utilizes GIS technology to establish a land construction suitability evaluation system for Nankang city,which is experiencing rapid urban expansion,and outlines the preliminary UGB under the future land use simulation(FLUS)model.At the same time,considering the coupled coordination of"Production-Living-Ecological Space",and based on the suitability evaluation,we revised the preliminary UGB by combining the advantages of the patch-generating land use simulation(PLUS)model and the convex hull model to delineate the final UGB.The results show that:1)the comprehensive score of the evaluation of the suitability of the construction of land from high to low shows the distribution of the center of the city to the surrounding circle type spread,the center of the city has the highest suitability score.The results of convex hull model show that the urban expansion type of Nankang is epitaxial.In the future,the urban expansion will mainly occur in the northern part of the city.The PLUS model predicts an increase of 3359.97 hm^(2)of construction land in Nankang by 2035,of which 2022.97 hm^(2)is urban construction land.2)The FLUS model has a prediction accuracy of 86.3%and delineates a preliminary UGB area of 9215.07 hm^(2).3)We used the results of the construction suitability evaluation,PLUS model simulation results,and convex hull model predictions to revise the originally delineated UGB.The final delineated UGB area is 8895.67 hm^(2)and it is capable of meeting the future development of the study area.The results of the delineation can promote sustainable urban development,and the delineation methodology can provide a reference basis for the preparation of territorial spatial planning.

Efficiency of Bio-Fertilizing as One of the Natural Alternatives to Improve the Growth of Khaya senegalensis and Swietenia mahagoni Trees and for Sustainability

A field experiment was carried out at Ismailia Research Station, Ismailia Governorate from 2020-2022 to improve the growth of Khaya senegalensis and Swietenia mahagoni by using a combination of mineral fertilizer (NPK) and biological fertilizer (Azotobacter chroococcum, Bacillus megatherium, and Bacillus circulant) as recommended dose under new sandy soils conditions. Split plot designed with four treatments (Control, (50% Mineral fertilizer (M.) + 50% Biological fertilizer (Bio.)), 100% M. and 100% Bio.) of each species. Vegetative growth, leaf area, tree biomass, stored carbon, basal area, tree volume, and in the soil both of microbial account and mineral content were determined. The experimental results showed no significant differences between studied species among the most studied parameters except for Khaya senegalensis which gave the highest significant difference in root biomass and below-stored carbon than Swietenia mahagoni. Evidently, the highest significant growth parameters were 100% mineral fertilizer followed by (50% M. + 50% Bio.) as compared with control. No significant difference between 100% M. and (50% M. + 50% Bio.) of shoot dry biomass (15.19 and 12.02 kg, respectively) and above-stored carbon (0.28 and 0.22 Mt, respectively). Microbial account and mineral content in soil were improved after cultivation of tree species compared to before planting and control, especially with 50% mineral fertilizer and 50% bio-fertilizer treatment. In conclusion, a treatment containing 50% mineral fertilizer and 50% bio-fertilizer has led to the ideal Khaya senegalensis and Swietenia mahagoni growth in sandy soil for cheaper and sustainable.

Can environmental sustainability be decoupled from economic growth? Empirical evidence from Eastern Europe using the common correlated effect mean group test

The European Union(EU) and Organisation for Economic Co-operation and Development(OECD) aim to develop long-term policies for their respective member countries. Having observed increasing dangers to the environment posed by rising economic growth, they are seeking pathways to enable policy action on economic growth and environmental sustainability. Given the facts in theoretical and empirical studies, this study assessed the validity of the decoupling hypothesis by investigating asymmetricity in the relationship between environmental sustainability and economic growth in nine Eastern European countries from 1998 to 2017 using the cross-section augmented Dickey-Fuller(CADF) unit root, panel corrected standard error(PCSE), common correlated effect mean group(CCEMG), and Dumitrescu Hurlin causality approaches. Both population growth and drinking water are used as controlled variables. The outcomes establish strong cointegration among all the variables of interest. According to the results of CCEMG test, economic growth exerts short-term environmental degradation but has long-term environmental benefits in Eastern Europe;and population growth and drinking water exert a positive effect on environmental sustainability in both the short-and long-run. The results of Dumitrescu Hurlin causality test indicate that environmental sustainability is unidirectionally affected by economic growth. Based on these outcomes, we suggest the following policies:(1) the EU and OECD should implement member-targeted policies on economic growth and fossil-fuel use towards regulating industrial pollution, water use, and population control;and(2) the EU and OECD member countries should invest in environmental technologies through green research and development(R&D) to transform their dirty industrial processes and ensure productive energy use.

Five Areas for Sustained High Economic Growth in China

Afierhavingexperiencedtwodecadesofsustainedhigh.economicqrnwthwillithppossibleforChinatoseecontinuedsustainedhigheconomicgrowthinanother10to20years?Followingtheeconomicslowdowninthepastfewyears,manyholdpessimisticviewsonthis.Inaninterviewwithacorresp...

Effects of Nano-sustained Release Sodium Butyrate on Growth and Intestinal Cell Proliferation of Grass Carps

Taking grass carps with the initial weight of about 20g as the research object,the basic feeds of grass carps were added with0.0%,0.1%,0.3%,0.6%,0.8%,and 1% of nano-sustained release sodium butyrate to prepare 6 types of experimental feeds with equal nitrogen and energy.The effects of different concentrations of nano-sustained release sodium butyrate were surveyed on growth and intestinal cell proliferation of grass carps.The experiment was carried out in cages with 50 carps per cage,and each treatment was repeated 3 times for60 days.Experimental results indicated that the addition of nano-sustained release sodium butyrate significantly promoted the growth of grass carps and significantly increased the ratio of intestinal villus to crypt depth.When the addition of nano-sustained release sodium butyrate was0.6%,the weight increase rate,specific growth rate,fullness and intestinal villus height of grass carps were the highest,which was significantly higher than that of the control group(P < 0.05).The study results indicated that addition of appropriate amount of nano-sustained release sodium butyrate can promote the growth of grass carps through increasing the intestinal villus height,and the suitable addition dosage was0.6%.

我国学前教育可持续发展评价指标体系及其测算

可持续发展是我国学前教育事业发展的战略目标和未来向往,也是学前教育事业健康稳定发展的必有表征、必需保障和必然路径。学前教育可持续发展亟需构建科学、完善的指标体系加以指引。基于可持续发展系统论,从高度与水平、空间结构、时间进程三个维度出发,构建了由发展度、协调度和永续度组成的学前教育可持续发展评价指标体系,并测算了当前我国学前教育可持续发展综合水平和“三度”水平,发现我国学前教育可持续发展整体处于中等水平,全国四大区域之间差异明显,发展度、协调度和永续度三者之间均衡性不足,“三度”内在构成要素之间也存在明显差异。我国学前教育可持续发展的实现,应以经费投入为重点,多措并举提高学前教育发展水平;以公平均衡为导向,推动城乡、园际学前教育协调发展;以内外合力为保障,驱动学前教育健康永续发展。

金融集聚对区域经济增长的影响研究——以中国31个省市为例

在新发展要求下,打造新型区域金融发展中心,有助于促进国内国际双循环、整合金融资源以及优化资源配置,进而助力于经济增长。文章基于2010—2021年我国省际面板数据,利用各省市的金融集聚水平,探索金融集聚对区域经济增长的影响。研究发现金融集聚水平提高会对一个地区的经济增长起正向显著效应。最后,文章基于实证分析的结论,对金融集聚的提升和地区经济的增长提出政策建议。未来我们应加快完善现代金融体系建设、持续优化区域经济结构与布局、不断发挥市场一体化发展优势,助力城市经济效率提升,为建设经济强国提供有力支撑。

Does digitalization mitigate regional inequalities?Evidence from China

Regional inequality significantly influences sustainable development and human well-being.In China,there exists pronounced regional disparities in economic and digital advancements;however,scant research delves into the interplay between them.By analyzing the economic development and digitalization gaps at regional and city levels in China,extending the original Cobb-Douglas production function,this study aims to evaluate the impact of digitalization on China's regional inequality using seemingly unrelated regression.The results indicate a greater emphasis on digital inequality compared to economic disparity,with variable coefficients of 0.59 for GDP per capita and 0.92 for the digitalization index over the past four years.However,GDP per capita demonstrates higher spatial concentration than digitalization.Notably,both disparities have shown a gradual reduction in recent years.The southeastern region of the Hu Huanyong Line exhibits superior levels and rates of economic and digital advancement in contrast to the northwestern region.While digitalization propels economic growth,it yields a nuanced impact on achieving balanced regional development,encompassing both positive and negative facets.Our study highlights that the marginal utility of advancing digitalization is more pronounced in less developed regions,but only if the government invests in the digital infrastructure and education in these areas.This study's methodology can be utilized for subsequent research,and our findings hold the potential to the government's regional investment and policy-making.

企业数字化转型、持续成长与劳动雇佣

以2010~2020年A股上市企业为样本,使用爬虫技术和文本分析法刻画企业数字化转型,实证考察数字化转型对企业持续成长的影响及作用机制,并进一步探讨数字化转型对企业劳动雇佣的影响。研究发现:企业数字化转型显著促进企业持续成长,经稳健性检验后依旧成立;从影响机制来看,数字化转型通过促进企业创新、降低交易成本和缓解融资约束促进企业持续成长;异质性分析发现,数字化转型对企业持续成长的促进作用在国有企业、东部地区企业和非高科技企业中更强;进一步研究发现,数字化转型促进企业劳动雇佣规模且高学历员工比例上升,同时也减少企业对生产技术工人的需求,并增强对研发、财务等高技能人才的需求,总体上优化了就业结构。

可缓释富血小板血浆生长因子的新型自组装多肽水凝胶制备及性能表征

背景:富血小板血浆水凝胶由于生长因子的突发释放与伤口部位蛋白酶的快速清除,导致生长因子在伤口部位的停留时间较短,近年来研究者关注利用水凝胶材料包封富血小板血浆,以改善富血小板血浆水凝胶的不足。目的:制备自组装多肽-富血小板血浆水凝胶,探究其对富血小板血浆生物活性因子释放的影响。方法:采用固相合成法合成自组装多肽,以D-PBS配制成溶液。将不同体积的多肽溶液分别与富血小板血浆、氯化钙/凝血酶溶液混合制备水凝胶,使体系中多肽的最终质量分数分别为0.1%,0.3%,0.5%,观察成水凝胶状态,并体外检测富血小板血浆中生长因子释放情况。将质量分数1%多肽溶液与质量分数1%人血清白蛋白溶液混合激发多肽自组装,使多肽的最终质量分数分别为0.1%,0.3%,0.5%,观察液体流动状态,并检测自组装多肽的流变力学性能。通过扫描电镜与透射电镜观察多肽(质量分数分别为0.1%,0.001%)-人血清白蛋白溶液的微观结构。结果与结论:①不同体积多肽溶液与富血小板血浆均可形成水凝胶,与富血小板血浆水凝胶相比,0.1%,0.3%多肽-富血小板血浆凝胶可缓解表皮生长因子、血管内皮生长因子的突发释放,延长释放时间至48 h。②添加人血清白蛋白后,0.1%多肽组仍呈流动液体,0.3%多肽组呈半液体状态,0.5%多肽组激发自组装形成水凝胶,确定富血小板血浆中人血清白蛋白可激发多肽自组装;随着多肽质量分数的提高,自组装多肽的存储模量越高,越容易成胶。③透射电镜下可见,添加人血清白蛋白前,多肽纳米纤维较短且无序堆积;添加人血清白蛋白后,多肽纳米纤维明显变长,并且相互交联成束,形成致密的纤维网络结构。扫描电镜下可见,添加人血清白蛋白前,多肽呈无序堆积的片状结构;添加人血清白蛋白后,多肽自组装成相互交联且有序密集排列的多孔状结构。④结果显示,新型自组装多肽可由富血小板血浆激发自组装,根据人血清白蛋白与多肽的比例可精准调节自组装效果,且多肽对富血小板血浆生长因子有缓释作用,可作为一种新型的生物材料应用于组织修复。

包容性增长视域下数字经济高质量发展的路径研究

随着新一轮科技革命与产业升级的不断深化,数字经济逐渐成为推动经济复苏和增长的重要引擎。然而,数字经济在高速发展的同时也带来了一系列挑战,如“数字鸿沟”的扩大、数字治理不完善、数字贸易壁垒等问题,不利于经济社会的稳定和可持续发展。为此,本文从包容性增长视角分析当前数字经济发展存在的问题,揭示数字经济发展与包容性增长的内在联系,探讨数字经济高质量发展的路径,旨在稳步推进中国共同富裕取得更为明显的实质性进展,实现经济社会公平和可持续发展。

破除和谐师生关系景观化的迷思

和谐师生关系意指师生间、师生与教育环境间达成的协调统一关系。通过解放固有角色、注重发展过程、体会交互共生,构筑了和谐师生关系的理想样态。和谐师生关系能够促进学生整全发展,驱动教师个体成长,推动教与学的共同进步。但以“有意识的表演和作秀”为特征的景观化现象瓦解了师生关系异质性的发展内核,致使学生的主体性假象被推崇、师生关系的发展过程被虚化、师生关系的育人价值被遮蔽,偏离了和谐师生关系的真实向度。超越景观化现象需复归其中具体的“人”,除了从师生的内在视角提出可行方案,还需要家庭、学校、社会协力共助,通过唤醒师生主观意识与过程性思维,达到和谐师生关系的自主、自觉发展,在彰显育人价值、营造健康氛围的过程中走出和谐师生关系景观化的局限。

Assessment of Municipal Solid Waste Management in the Farmgate Area of Dhaka North City Corporation

This investigation is focused on conducting a thorough analysis of Municipal Solid Waste Management (MSWM). MSWM encompasses a range of interdisciplinary measures that govern the various stages involved in managing unwanted or non-utilizable solid materials, commonly known as rubbish, trash, junk, refuse, and garbage. These stages include generation, storage, collection, recycling, transportation, handling, disposal, and monitoring. The waste materials mentioned in this context exhibit a wide range of items, such as organic waste from food and vegetables, paper, plastic, polyethylene, iron, tin cans, deceased animals, byproducts from demolition activities, manure, and various other discarded materials. This study aims to provide insights into the possibilities of enhancing solid waste management in the Farmgate area of Dhaka North City Corporation (DNCC). To accomplish this objective, the research examines the conventional waste management methods employed in this area. It conducts extensive field surveys, collecting valuable data through interviews with local residents and key individuals involved in waste management, such as waste collectors, dealers, intermediate dealers, recyclers, and shopkeepers. The results indicate that significant amounts of distinct waste categories are produced daily. These include food and vegetable waste, which amount to 52.1 tons/day;polythene and plastic, which total 4.5 tons/day;metal and tin-can waste, which amounts to 1.4 tons/day;and paper waste, which totals 5.9 tons/day. This study highlights the significance of promoting environmental consciousness to effectively shape the attitudes of urban residents toward waste disposal and management. It emphasizes the need for collaboration between authorities and researchers to improve the current waste management system.

数字技术会带来“技术奇点”吗?

经济增长的本质是什么?人类是否能够实现经济的可持续增长?数字技术是否可能带来“技术奇点”,从而创造一个不需要人类且产出无限增长的世界?本文首先从经济学的角度系统梳理关于数字技术对经济增长影响的研究,在此基础上从限制经济增长的物理因素角度对上述问题进行重新解读。本文认为:即便数字技术是人类历史的又一次革命,并且也可能创造一轮新的经济增长奇迹,但是,人类经济活动终究不能脱离有用物质有限、空间有限、物质不可无限分割以及地球承载能力有限的约束。而数字技术所带来的不平等以及其对生态环境的破坏,会进一步割裂GDP与人类福祉之间的关系。为此,从“技术奇点”转向“可持续的福祉增长”就成为一项迫在眉睫的关键任务。

共同富裕背景下京津冀地区农民可持续增收路径研究

农民可持续增收对推动区域经济发展、提升农民幸福感、助力乡村振兴具有重要意义。在共同富裕背景下,京津冀地区农民增收取得显著成效,但在收入结构、收入保障机制、收入主体素养提升等方面仍面临瓶颈,制约了该区域农民可持续增收的实现。基于此,文章通过分析京津冀地区农民收入水平、收入结构和增收瓶颈等现状,提出了激发京津冀区域一体化活力、构建多元收入渠道、健全培育机制等举措,以实现该区域农民可持续增收目标。

佐力药业可持续增长研究

企业的可持续增长能力对于长期发展至关重要,本文以佐力药业2017—2021年财务报表为依据,计算各项财务指标,并将指标与复星医药和上海医药进行对比,最后再运用希金斯模型计算佐力药业的可持续增长率。最后发现,通过计算得到的可持续增长率与实际增长率不相同,进而得出佐力药业资本结构与发展战略不匹配等问题,并提出了相应的建议。

农业科技创新、生态效率与农户增收质量的动态关系——基于面板向量自回归模型的实证分析

农业科技创新在提高农产品产量和质量的同时也面临促进农户增收的困境,而生态效率的提高也可能造成农户收入不平等的问题。为进一步探究农业科技创新水平、生态效率与农户增收三者之间的关系,根据2000—2020年间湖南省的时间序列信息,利用面板向量自回归模型,采用协整检测、格兰杰检测、方差分解等各种手段,对农业科技创新水平、生态效率和农户增收质量间的相关性开展实证分析,以为处理好农业发展、农户收入和生态环境保护之间的关系提供理论参考。结果显示:农业科技创新与农户增收质量之间存在显著的双向正向关系,即科技创新在提升农业生产效率和质量的同时显著促进了农户的经济增长,但生态效率的提升在短期内未能显著转化为农户的经济收益;农业科技创新对农户增收质量的影响即时且显著,并随着时间推移而趋于稳定;在预测农户增收质量时,农业科技创新的作用明显超过生态效率。基于此,从长期规划生态效率提升、加大农业科技创新的支持与投资和增强农户生态环保意识等方面提出政策建议。

基于水肥一体化的植物生长调控机制研究

现代农业技术的发展使水肥一体化技术成为提高农业生产效率和可持续性的重要途径。该文探讨基于水肥一体化技术的植物生长调控机制。通过构建植物生长的环境控制模型,综合考虑环境因素与植物生理反应的相互作用,通过在智能温室内设置实验,实时监测土壤湿度、肥料浓度、光照强度等关键参数,并记录作物的生长速率、产量和品质。实验结果表明,合理的水肥管理策略对作物根系发育、光合作用和营养吸收具有显著促进作用,能显著提高作物产量和养分利用效率。特别是针对作物不同生长阶段的定制化水肥供给策略,对提高作物抗逆性和减少水肥流失具有重要意义。该研究不仅为现代农业生产实践提供理论依据和技术指导,还为进一步的精准农业研究和可持续发展政策制定提供参考。

安徽省经济高质量发展新旧动能转换路径研究

新时代背景下,为实现并推动安徽省经济高质量发展,对新旧动能转换路径进行优化势在必行。文章首先分析了安徽省经济发展总体概况,其次深入研究了当前的经济发展现状以及面临的问题和挑战,最后提出安徽省新旧动能转换的路径选择,具体包括创新驱动、产业融合与集群发展、绿色经济与可持续发展、政策环境优化四个方向策略及一系列建议,以促进产业升级、技术创新和政策支持,从而实现安徽省经济的可持续发展。

财务可持续增长探究——以D公司为例

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