Spatiotemporal Differences and Classification Regulation of Urbanization Impact on Agricultural Development in Shrinking Areas:A Case Study of 15 Shrinking Cities in Three Provinces of Northeast China

Studying the impact of urbanization on agricultural development in shrinking areas is important for maintaining food security and promoted agricultural development in China.Based on the measurement results of the shrinking cities in the three provinces of Northeast China,this paper selects 15 shrinking cities as the research object,and constructs a multi-dimensional index system to explore the impact of the urbanization level of the shrinking areas on the agricultural development in the region since 2007–2019,analyzes the influencing factors and their differences by using the geographically-weighted regression model and Geodetector,and proposes a targeted regulation strategy.The results show that:1)overall,there is a negative correlation between the urbanization level and the agricultural development level in the contracted areas of the three northeastern provinces.The urbanization level in these areas has a certain negative impact on the overall level of agricultural development;2)regarding the time dimension,the impact of urbanization level on the agricultural development level in the contracted areas of the three northeastern provinces gradually increases over time;3)regarding the spatial pattern,the overall impact of shrinking urbanization levels in the three provinces of Northeast China on the agricultural development shows a significant distribution pattern of high in the east and low in the west;4)the total population and natural population growth rate at the end of the year were the main factors influencing a certain level of urbanization on agricultural development in the shrinking cities while population density and the urban fixed asset investment rate were the secondary factors;and 5)the main reasons why the level of agricultural development in different cities was affected by the level of urbanization were different.However,they can be categorized into areas of population loss and spatial construction,which can be further divided into area of population loss in the northeast,areas of negative population growth in the west,and areas of urban spatial change in the south.According to the causes of the impact,this paper adopted targeted regulation strategies and formulated relevant policies and solutions that cater to local conditions.

Environmental Effects of Foreign Trade and Its Spatial Variations in Mid-eastern Provinces and Cities of China

The studies on environmental effects of foreign trade and its spatial variations are helpful to design and implement environmental protection countermeasures.In order to eliminate the adverse effects of insufficient observation values on the accuracy of regression results and dynamic information quantity of fitting equation during empirical study,panel data of the mid-eastern provinces and cities of China from 1985 to 2007 were selected based on the adjustment of classical regression model in this paper.Panel unit root test and panel cointegration analysis method were applied to investigating the environmental effects of foreign trade and its spatial variations in the mid-eastern provinces and cities of China and its three groups divided by foreign trade dependence.The results show that all scale effects are positive,while all technical effects are negative and unable to counteract positive scale effects.Foreign trade development is regarded as an important cause for outstanding eco-environmental problems in the mid-eastern provinces and cities of China.Total effects and structural effects are significantly different among different groups because of spatial variations in environmental policies,export destinations,source of FDI,etc.Following the principle of′coordinating generality and considering differences comprehensively′,it is essential to issue a series of policies and countermeasures corresponding to differences in regional environmental effect of foreign trade,in order to coordinate the relationship between foreign trade development and eco-environment in each region.

Characteristics of Volcanic Rocks in the Shoshonite Province, Eastern China, and Their Metallogenesis

The shoshonite province in eastern China is characterized by extensive distribution (ca. 80000 km2) of Late Jurassic-Early Cretaceous (165-100 Ma) shoshonite series with subordinate high-K calc-alkali series. It was formed in a dominantly tensile stress field. In comparison with their analogues in island arcs and active continental margins in other countries, the volcanic rocks in the shoshonite province have their specific characteristics in petrology, mineralogy and geochemistry as well as related mineralization association, which are the comprehensive reflection of the special composition and structure of the mantle and crust of the province and the special Mesozoic regional tectonic setting.

U-Pb Zircon Age, Geochemical, and Sr-Nd-Pb Isotopic Constraints on the Age and Origin of Mafic Dykes from Eastern Shandong Province, Eastern China

U-Pb zircon age, geochemical, and Sr-Nd-Pb isotopic data of mafic dykes from eastern Shandong Province, eastern China is reported herein. Laser ablation inductively coupled plasma mass spectrometry （LA-ICP-MS） U-Pb zircon analyses of two samples from the investigated mafic dykes yield consistent ages ranging from 121.9 Ma ± 0.47 Ma to 122.9 Ma ± 0.61 Ma. The mafic dykes are characterized by high （87Sr/86Sr） i ranging from 0.7087 to 0.7089, low εNd（t） values ranging from -16.9 to -17.8, 206Pb/204Pb = 17.15 to 17.17, 207Pb/204Pb = 15.45 to 15.47, and 208Pb/204Pb = 37.59 to 37.68. Results from the current study suggest that the mafic dykes are derived from partial melting of ancient lithospheric mantle that was variably hybridized by melts derived from foundered lower crustal eclogite. The mafic dykes may have been generated through subsequent insignificant crystal fractionation and very minor crustal contamination during magma ascent. Combined with previous studies, the current findings provide new evidence that the intense lithospheric thinning beneath the eastern Shandong Province of eastern China occurred at ~120 Ma, and that this condition was caused by the removal of the lower lithosphere （mantle and lower crust）.

Dynamics of the coronavirus disease 2019(COVID-19)epidemic in Wuhan City,Hubei Province and China:a second derivative analysis of the cumulative daily diagnosed cases during the first 85 days

Background:Controlling the coronavirus disease 2019(COVID-19)epidemic requires information beyond new and cumulative cases.This study aims to conduct an in-depth analysis by geographic strata:Wuhan City(hereafter referred to as Wuhan)only,Hubei Province(hereafter referred to as Hubei)excluding Wuhan,and China excluding Hubei.Methods:Daily cumulative confirmed COVID-19 cases between December 8,2019(the date of symptom onset based on patients'recall during the investigation),and March 1,2020,from official sources and published studies were analyzed.The second derivative model was used for information extraction.Data analysis was conducted separately for the three strata.Results:A total of 80026 diagnosed COVID-19 cases were reported during the first 85 days of the epidemic,with 49315 cases from Wuhan,17788 from Hubei excluding Wuhan,and 12923 from China excluding Hubei.Analytical results indicate that the COVID-19 epidemic consists of an Acceleration,a Deceleration,and a Stabilization Phase in all three geographic strata,plus a Silent Attack Phase for Wuhan only.Given the reported incubation period of 14 days,effects of the massive anti-epidemic actions were revealed by both the Acceleration and Deceleration Phases.The Acceleration Phase signaled the effect of the intervention to detect the infected;the Deceleration Phase signaled the declines in new infections after the infected were detected,treated and quarantined.Conclusion:Findings of the study provide new evidence to better monitor the epidemic,evaluate its response to intervention,and predict the trend long.In addition to re-evaluating the control of the COVID-19 epidemic in China,this study provided a model for monitoring outbreaks of COVID-19 in different countries across the world.

Evaluation of urban underground space resources using a negative list method: Taking Xi'an City as an example in China

Utilization of urban underground space has become a vital approach to alleviate the strain on urban land resources,and to optimize the structure and pattem of the city.It is also very important to improve the city environment,build livable city and increase the capacity of the city.Based on the analysis of existing evaluation methods and their problems,a method for evaluating underground space resources based on a negative list of adverse factors affecting underground space development is proposed,to be primarily used in urban planning stages.A list of the adverse factors is established,including limiting factors,constraining factors and influencing factors.Taking Xi'an as an example,using a geographical information system platform,a negative list of adverse factors for the underground space resources in Xi'an City are evaluated,and preventive measures are proposed.Natural resources,exploitable resources,and the potential growth of exploitable underground space resources are evaluated.Underground space assessment in the different development stages of the city,collaborative utilization and safety evaluation for multiple subsurface resources,environmental impact and assessment,as well as evaluation methods based on big data and intelligent optimization algorithms are all discussed with the aim of serving city planning and construction.

Official Confident of Eastern China Province's Foreign Trade

Customs statistics show the foreign tradevolume of eastern China’s Zhejiang Provincein 1998 amounted to US$14.85 billion,anannual increase of 4.3 percent.The exportswas US$10.8 billion,up 7.7 percent from1997;the imports ranked the fourth in thenation.This was hard won in the difficultiescaused by the Asian financial crisis.

Fabulous Finish Wuhan City, Hubei Province, China

Helalia Johannes (right),a marathon runner from Namibia, wins the women’s5 km title in 15 minutes14.23 seconds at the Seventh CISM Military World Games in Wuhan, capital of central China’s Hubei Province, on October 24. The 39-yearold runner holds Namibian records in 10 km and 20 km races.

中国东部木犀科一新种--陈氏女贞

描述了采自中国东部木犀科Oleaceae女贞属Ligustrum L.一新种--陈氏女贞L.chenii W.Y.Xie,X.D.Mei et F.Chen,并附有线描图.新种形态与台湾地区特有种阿里山女贞L.pricei Hayata相似,不同之处在于叶片卵形至卵状披针形,先端长渐尖或尾状渐尖,基部楔形至近圆形,上面中脉隆起,连同侧脉密被微柔毛,叶柄长3~5 mm,密被微柔毛;花序梗长0~1.4 cm,花梗长1.5~2 mm,花萼长1.1~1.6 mm,花冠淡黄绿色,外面有时带紫色,稀白色,花药长约4 mm;果实顶端常具宿存花柱,长1~2 mm,喙状.

红色档案编研的现状和发展路径探析——以华东六省一市为例

红色档案编研工作,就是要用档案讲好党的故事、从红色档案中大力挖掘与时代同频共振的文化基因,用群众喜闻乐见的方式让红色档案中蕴含的红色基因入脑入心。华东六省一市是革命老区,有着独特的红色档案资源优势,文章以线上调查、实地调查以及访谈的形式对六省一市红色档案的编研现状进行了调研,并对调研结果进行汇总和深入分析,从而提出红色档案编研的发展路径。

GUILLAIN-BARRE SYNDROME IN SIX CITIES AND PROVINCES OF NORTHERN CHINA:IS IT A NEW ENTITY?

Forty cases of Guillain-Barre Syndrome were reported, (GBS) which came from the regions where 'Chinese Paralytic Syndrome' and 'Acute Motor Axonal Neuropathy (AMAN)' were presented before. A study on their clinical, electrophysiological and pathological features was conducted, records on 3 733 GBS cases reported in northern China from 1978 to 1992 were reviewed and compared with cases of 'acute moter axonal nouropathy' . The results showed that the clinical, electrophysiological and pathological features of GBS in north China are similar to those of typical GBS cases in western countries, though there seemed to be some special epidemiological features in age, seasonal and regional distribution. It was concluded that the GBS in northern China is de-myelinating GBS dominantly, not a new entity.

浙江蓼科一新种--丽水蓼子草

描述了采自中国浙江省的蓼科Polygonaceae蓼属Polygonum L.一新种--丽水蓼子草P.lishuiense Z.H.Chen,D.H.Wu,W.Y.Xie et J.F.Wang,并附有线描图.新种形态与蓼子草P.criopolitanum Hance相似,不同之处在于其茎仅最顶端的节间具腺毛;叶片、叶柄和叶鞘均无腺毛;穗状花序呈圆柱状,长1.5~2.8 cm,直径7~9 mm;每苞片内具2或3花,仅1花可育;花柱2或3;小坚果倒卵状扁球形,双凸镜状,长约1.35 mm,或3棱形,长约1.2 mm,直径约0.7 mm.

华北克拉通始太古代演化——来自冀东38亿年片麻岩锆石Hf-O同位素的记录

陆壳成因的研究对了解地球演化具有重要意义,但由于古老陆壳岩石出露有限,目前地球早期陆壳研究还比较薄弱。近期,冀东地区一处新的始太古代岩石记录的发现,为研究华北克拉通内部早期陆壳性质提供了极为重要的对象。本文对冀东卢龙喇叭山地区这处新发现的始太古代花岗闪长质片麻岩进行了详细的锆石U-Pb年代学和Hf-O同位素分析。结果显示该样品中锆石具有自形-半自形晶形、振荡环带的内部结构,较高的Th、U含量以及Th/U比值,显示岩浆锆石特征。7个SIMS分析点给出的加权平均^(207)Pb/^(206)Pb年龄为3776±11Ma(MSWD=3.1),代表了花岗闪长质岩浆的结晶年龄,指示冀东地区存在始太古代结晶基底。这些锆石的O同位素组成(δ^(18)O=5.81±0.13‰)与地幔锆石在分析误差范围内一致,其Hf同位素组成(ε_(Hf)(t)=0.09±0.31)与球粒陨石均一岩浆库类似。这些Hf-O同位素特征显著不同于冀东地区曹庄岩组中发现的始太古代碎屑锆石,说明其不可能作为曹庄岩组变沉积岩的物源区。而华北克拉通内部鞍山地区的始太古代片麻岩中的岩浆锆石与冀东始太古代碎屑锆石在Hf-O同位素特征上最为类似,因此前者是冀东始太古代碎屑锆石最可能的源岩,暗示冀东地区和鞍山地区在始太古代时可能是统一的整体。与全球始太古代岩石记录对比发现,华北克拉通主体与North Atlantic克拉通、Pilbara克拉通和塔里木克拉通等主要克拉通类似,其内部目前发现的最古老岩石都具有与球粒陨石一致的锆石Hf同位素组成,指示大部分始太古代陆壳可能源自一个未发生明显分异的相对原始地幔源区。

全国—本地尺度下东北三省城市创新网络演化特征与创新能力研究

在网络科学不断发展,创新过程存在跨区域、多尺度、动态性特点的背景下,创新网络及其演化已成为创新经济地理学关注的重点领域。本文将2004-2018年城市间合作专利信息作为原始数据,来表征东北三省城市创新网络,借助Gephi、Ucinet等分析工具,运用复杂网络等研究方法,基于全国—本地尺度分析其格局和结构的演化特征,测度城市创新网络资本,评价城市创新能力,进而对二者关系进行探讨。结果表明:全国—本地尺度下的东北三省城市创新网络的演化特征存在一定的相似性,以“哈长沈大”为网络核心的格局逐渐清晰,网络成长性明显但创新合作的紧密程度和效率均不可观。全国—本地尺度下东北三省城市创新网络演化特征同样存在差异性,全国尺度的网络增速小于本地尺度且存在“小世界”特性,创新资源的跨区域流动不畅通。东北三省城市创新网络资本与城市创新能力水平相关性增强,城市创新能力格局与城市网络地位分布较为一致,城市位于网络的地位以及获取异质性知识与技术的能力更为重要。

数字中国建设背景下数字平台赋能数字乡村治理的路径研究——基于浙江省建德市“建村钉”数据治理平台的例证

数字乡村治理是数字中国建设战略的重要组成部分。2023年印发的《数字中国建设整体布局规划》强调推动数字技术和实体经济深度融合,在农业、工业、金融等重点领域,加快数字技术创新应用。2023年是浙江省在“八八战略”指引下启动“千村示范、万村整治”工程二十周年,文章聚焦浙江省建德市“建村钉”数据治理平台,以亨利·列斐付尔的空间生产理论为指导,提炼出建德市搭建数据治理平台来实现数字乡村治理的路径,即“拓宽集体数治空间—创新数治情感空间—开辟技术应用空间”,指出我国农村数据治理的数据仍存在安全风险且数据标准尚未完全统一等问题,并从政府、村民个人、相关技术企业的角度,提出相应的对策和建议。

Delineation of Potential Mineral Resources RegionBased on Geo-anomaly Unit

The geological anomaly unit method (GAUM) is a new way to delineate and evaluate ore finding targets in line with the “geological anomaly ore finding theory”. Comprehensive ore finding information from geological, geochemical and geophysical data is used for quantitative measurement of the “ore forming geological anomaly unit” in this paper. The main procedures are shown as follows: (1) The geo anomalous events associated with gold mineralization are analyzed in Tongshi gold field; (2) The zonation in the concentrated heavy minerals and the stream sediment elements of ore forming geo anomaly are studied in detail; (3) The deep geological structural framework is deduced by means of the synthetic geological interpretation of gravity and magnetic information; (4) The ore controlling geo anomalies and ore anomalies are chosen as the variables of the favorable ore forming indexes that can be used for the quantitative delineation and evaluation of the potential ore forming regions.

CENTURIES OF FRIENDSHIP Chinese descendants of an ancient Filipino king

“I discovered that I was a descendantof Paduka Pahala at a very youngage,” recounted An Jing, a 19thgenerationdescendant of the travelerfrom what is now the southernPhilippines. Tradition holds thatPahala’s family remained in Chinaafter his demise. An serves as directorof publicity at Dezhou Sulu CultureMuseum in eastern China’s ShandongProvince. “It’s my duty to protect thetomb of the king of Sulu and preservehis deep feelings about China.”The ruler from the ancient kingdomof Sulu has rested in China for morethan 600 years, leaving a testament tothe timelessness of China-Philippinesfriendship. Twenty-two generationsof his family have protected the tombas a source of spiritual sustenanceand a historical witness of friendshipbetween the two countries.

中国地震预报论坛2023年度学术交流大会在四川康定召开

中国地震学会地震预报专业委员会和四川省地震局于2023年8月15—19日在四川省康定市联合举办了中国地震预报论坛2023年度学术交流大会,来自全国地震行业内、外8所大学、4个中科院直属科研院所与23个地震行业直属科研院所及省市级分支机构共35个单位的100余名代表参加了此次会议。学术交流设置了12个专题;会前征集到论文96篇,会期交流报告78个,其中口头报告23个,张贴展板55个;23个口头报告中,大会特邀报告6个;从55个张贴报告中,评选出优秀报告6个,最佳设计创意报告1个。为了配合活断层野外识别的科普培训,本次大会将原计划以“制约地震三要素的因素与地震三要素预报的瓶颈问题”为主题的大会圆桌讨论改成了“鲜水河断裂带高震级危险性分析”的专题培训讲座,讲座之后再适时举行了“如何强化高危险区的临震监测与临震跟踪预报能力”的专题讨论。对2022年泸定6.8级地震的交流讨论提出了新的科学问题。大会不仅重视学术交流,还兼顾了科学传播的普及,利用当地的科普资源,因地制宜地组织了为期一天的鲜水河断裂带活动特征的野外识别科普培训。地震预报论坛学术交流大会全体与会代表参加了此次野外实训活动,活动中邀请了著名的鲜水河断裂带活动特征研究专家现场授课,增强了地震预报与地震地质领域的跨学科交流,强化了学术交流的效果。

双碳背景下中国海油三个万亿大气区勘探战略思考

天然气具有清洁低碳等优势,在实现中国碳达峰、碳中和目标过程中将发挥重要作用。中国海油为响应国内不断加大天然气勘探开发力度的号召,提出了三个万亿大气区战略布局,即:南海万亿大气区、渤海万亿大气区和陆上鄂东-沁水万亿大气区,这三个万亿大气区是中国海油国内天然气增储上产的主要区域。本文聚焦资源基础、勘探方向、勘探理论认识与技术攻关方向,明确了中国海油建设三个万亿大气区的时间表和路线图。研究认为:①中国海油在南海北部、渤海海域和陆上探区具备实现三个万亿大气区的现实储量基础和资源潜力;②深水深层、深水超浅层、浅水深层和陆上深煤层,是未来中国海油开展天然气勘探的重要方向;③深部优质储层分布规律和深部油气富集机理等理论认识,深部储层改造、深部地震成像等关键技术,是未来需要重点攻关的理论技术方向。