Predictive value of intracranial high-density areas in neurological function

BACKGROUND Intracranial high-density areas(HDAs)have attracted considerable attention for predicting clinical outcomes;however,whether HDAs predict worse neurological function and mental health remains controversial and unclear,which requires further investigation.In this prospective study,96 patients with acute ischemic stroke(AIS)who accepted endovascular mechanical thrombectomy(EMT)were included.The enrolled patients underwent cranial computed tomography(CT)examination within 24 hours after EMT.Clinical data in terms of National Institutes of Health Stroke Scale(NIHSS),the 3-month modified Rankin Scale(mRS),self-rating depression scale(SDS),and self-rating anxiety scale(SAS)scores were collected and compared between patients with HDAs and non-HDAs and between patients with good and poor clinical prognosis.Compared to patients without HDAs,patients with HDAs presented severe neurological deficits(admission NIHSS score:18±3 vs 19±4),were more likely to have post-stroke disabilities(mRS<3:35%vs 62%),and suffered more severe depression(SDS score:58±16 vs 64±13)and anxiety disorder(SAS score:52±8 vs 59±10).Compared to patients with a good prognosis,patients with a poor prognosis presented severe neurological deficits(admission NIHSS score:17±4 vs 20±3),were more likely to have HDAs on CT images(64%vs 33%),and suffered more severe depression(SDS score:55±19 vs 65±11)and anxiety(SAS score:50±8 vs 58±12).Multivariate analysis revealed that HDAs were independent nega-tive prognostic factors.CONCLUSION In conclusion,HDAs on CT images predicted poor prognosis and severe depressive and anxiety symptoms in patients with AIS who underwent EMT.

Monitoring Study of Long-Term Land Subsidence during Subway Operation in High-Density Urban Areas Based on DInSAR-GPS-GIS Technology and Numerical Simulation

During subway operation,various factors will cause long-term land subsidence,such as the vibration subsidence of foundation soil caused by train vibration load,incomplete consolidation deformation of foundation soil during tunnel construction,dense buildings and structures in the vicinity of the tunnel,and changes in water level in the stratum where the tunnel is located.The monitoring of long-term land subsidence during subway operation in high-density urban areas differs from that in low-density urban construction areas.The former is the gathering point of the entire urban population.There are many complex buildings around the project,busy road traffic,high pedestrian flow,and less vegetation cover.Several existing items requiremonitoring.However,monitoring distance is long,and providing early warning is difficult.This study uses the 2.8 km operation line between Wulin Square station and Ding’an Road station of Hangzhou Subway Line 1 as an example to propose the integrated method of DInSAR-GPS-GIS technology and the key algorithm for long-term land subsidence deformation.Then,it selects multiscene image data to analyze long-termland subsidence of high-density urban areas during subway operation.Results show that long-term land subsidence caused by the operation of Wulin Square station to Ding’an Road station of Hangzhou Subway Line 1 is small,with maximumsubsidence of 30.64 mm,and minimumsubsidence of 11.45 mm,and average subsidence ranging from 19.27 to 21.33 mm.And FLAC3D software was used to verify the monitoring situation,using the geological conditions of the soil in the study area and the tunnel profile to simulate the settlement under vehicle load,and the simulation results tended to be consistent with the monitoring situation.

Growth behavior and resource potential evaluation of gas hydrate in core fractures in Qilian Mountain permafrost area, Qinghai-Tibet Plateau

The Qilian Mountain permafrost area located in the northern of Qinghai-Tibet Plateau is a favorable place for natural gas hydrate formation and enrichment,due to its well-developed fractures and abundant gas sources.Understanding the formation and distribution of multi-component gas hydrates in fractures is crucial in accurately evaluating the hydrate reservoir resources in this area.The hydrate formation experiments were carried out using the core samples drilled from hydrate-bearing sediments in Qilian Mountain permafrost area and the multi-component gas with similar composition to natural gas hydrates in Qilian Mountain permafrost area.The formation and distribution characteristics of multi-component gas hydrates in core samples were observed in situ by X-ray Computed Tomography(X-CT)under high pressure and low temperature conditions.Results show that hydrates are mainly formed and distributed in the fractures with good connectivity.The ratios of volume of hydrates formed in fractures to the volume of fractures are about 96.8%and 60.67%in two different core samples.This indicates that the fracture surface may act as a favorable reaction site for hydrate formation in core samples.Based on the field geological data and the experimental results,it is preliminarily estimated that the inventory of methane stored in the fractured gas hydrate in Qilian Mountain permafrost area is about 8.67×1013 m3,with a resource abundance of 8.67×108 m3/km2.This study demonstrates the great resource potential of fractured gas hydrate and also provides a new way to further understand the prospect of natural gas hydrate and other oil and gas resources in Qilian Mountain permafrost area.

Development of a compact high-density blue core helicon plasma device under 2000 G magnetic field of ring permanent magnets

A helicon wave plasma source in a tube of ring permanent magnets(PMs)has been constructed to study the effect of the conflguration of the magnetic fleld with zero magnetic points on plasma parameters.This device also serves as an exploration platform for a simple,compact helicon wave plasma source adaptable to engineering applications.A small-diameter(26 mm)highdensity(~10^(18)m^(-3))blue core plasma is produced in~1 Pa argon by helicon RF(radiofrequency)discharge using a NagoyaⅢantenna under magnetic fleld(~2 k G)of compact ring PMs(length~204 mm).Operational parameters,i.e.RF power and neutral gas pressure are scanned and plasma density is measured by an RF compensated probe to explore the operating characteristics of the device.Iconic feature of a helicon discharge,such as blue core plasmas and E-H-W mode transitions are well observed in the device,despite the wavelength calculated using the conventional dispersion relation of a bounded whistler waves(Chen 1991 Plasma Phys.Control.Fusion 33339)is order of magnitudes longer than the length of the plasma in this device which seems to suggest that such helicon device is impossible.Surprisingly,the wavelength calculated by the unbounded whistle wave dispersion formula in turn suggests the occurrence of a half wavelength resonance.

Structural Analysis for Qazzaz Metamorphic Core Complex,Northwestern Arabian Shield,Saudi Arabia

Identifying deformational mechanisms and associated structures at various scales,ranging from regional-scale structures to microscopic fabric,is crucial for the assessment of tectonic development.Thirty-three samples were taken from the Qazzaz metamorphic core complex to estimate the finite strain for felsic and mafic minerals.These samples included gneisses rocks,monzogranite,and metavolcano-sedimentary rocks for both the Thalbah and Bayda groups.Using the Rf/j and Fry methods,the axial ratios(XZ)range about 2.20 to 7.10 and 1.90 to 9.10,respectively.For various rock units,the strain measurements show moderate to highly deformation.Most of the observed samples show shallow WNW dipping along a N to WNW trend of finite strain(X).The short axes(Z)based to be subvertical foliation related with a subhorizontal foliation.The results demonstrate that contacts generated at semi-brittle to ductile deformation and that the strain of magnitude has the same value for different lithologic units.It concluded that nappe generation in orogens results from pure shear deformation.

Study on Conceptual Planning of Group Landscapes in Urban Core Areas—A Case Study of Conceptual Landscape Planning of the Core Area in Shuangsong Group,Wanzhou District of Chongqing City,China

The planning site was divided into a spatial structure of"one center,one corridor,two axes,two belts and three communities"and traffic system designed to a 3-grade road system of"artery,secondary artery and by-pass".Meanwhile,a 3-ring structure of the planning site was constructed:diffusion waterfront landscape belt,waterfront pathway and core eco-green island.Finally,the planning concepts for major ecological constructions were given.This study tried to explore the group eco-landscape pattern in urban core areas so as to provide a strategic instruction for the regional sustainable development.

Potential evaluation and implementation strategy for pocket park construction in high-density urban areas: A case study in Dalian, China

As an important element of urban renewal in highly urbanized areas, pocket parks with small size, flexible layout and daily accessibility are becoming a major component of green infrastructure and the mainstay of outdoor recreation space expansion in high-density urban centers. Nevertheless, the absence of a comprehensive framework for evaluating the potential of pocket park construction (PPC), one that integrates diverse influencing factors on a macro scale, has resulted in the random installation of such spaces, often failing to optimize the utilization of urban land. Addressing this critical lacuna, we propose an approach to evaluate PPC potential from a city-scale perspective, which is used to support the determination of which land units should be prioritized for PPC. A complete and feasible workflow was also established to identify potential land units, construct an index system for PPC combining demand and supply levels, quantitatively calculate indices based on remote sensing (RS) and geographic information system (GIS), accurately evaluate PPC potential using an entropy-weighted TOPSIS model, and develop targeted renewal strategies. A case study in Dalian, China, demonstrated the applicability and implications of the workflow. The results showed that it is flexible and easy to adapt to different local contexts, allowing evaluators to introduce parameters considering the availability of local data, and will help decision makers to build pocket parks in the most effective plots, providing a strong reference for high-quality development in other high-density urban centers facing the contradiction between ecological construction and land scarcity.

Advances in Research on Modern Agricultural Development in Grain Production Core Area of China

Grain production core area is key region of modern agricultural development in China. Through summarizing related literature about grain production area and modern agricultural development researches both at home and abroad,it obtained characteristics and existing problems in the modern agricultural development of the grain production core area. It is found that there are many research perspectives in modern agricultural development of the grain production core area. On the basis of analyzing the grain production core area and connotation,mode and evaluation of the modern agricultural development,it is concluded that further study should be carried out for adopting which development mode and how to make evaluation,so as to provide theoretical guidance for balanced development of modern agriculture in grain production core area of different regions.

Late Caledonian Orogenic Extensional Deformation and Metamorphic Core Complexes in Xuefengshan Area,Southern China

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Changes of Nitric Oxide Synthase Activity in Penumbral and Core Area during Focal Cerebral Ischemia and Reperfusion in Rats

Objective:To study the changes of nitric oxide synthase(NOS)activity in penumbral and core area during focal cerebral ischemia and reperfusion,and to explore the therapeutic window of focal cerebral ischemia. Methods:The middle cerebral artery of rats was occluded for 15,30,60,90 and 120 min by an intraluminal filament respectively,and recirculation was instituted for 24 h.The changes of NOS activity in ischemic core area(parietal cortex and caudoputamen)and penumbral area (frontal cortex)were examined after focal cerebral ischemia and reperfusion using NADPH-d histochemistry technique.Results:The NOS activity of the ischemic penumbral area peaked at 60 min while the ischemic core area peaked at 30 min then declined at 90-120 min sharply.Conclusion:NOS takes part in cerebral ischemic damage during focal cerebral ischemia and reperfusion.The NOS activity of the ischemic penumbral area is different from the ischemic core area.The peak time of the penumbral area is delayed comparing with the core area.The data suggest that the best time to apply NOS inhibitor is within 30 min in ischemic core area, and 60 min in penumbral area.

The Evolution of Landscape Patterns of and Optimization Measures for Urban Core Areas Against the Background of Urbanization: A Case Study of Yangling Demonstration Zone

Studying tiie urban landscape pattern plays a crucial role in scientific land use and management and in improving the urban ecological environment In this paper, AutoCAD, ArcGIS, Fragstats, and other software were used to analyse the data of the fourth phase of land use in the core atea of Yangling Demonstration Zone. The results showed that： ① in the core area, the percentage of construction land incteased from 18.22% to 61.72%, and the percentage of agricultufal land decreased from 58.36% to 11.14%. And the fafm land was fragmented, and traffic connectivily was strengthened. The afea of garden land was reduced from 251.89 hm2 to 50.38 hm^2, and the landscape metric of forest land showed an inverted V-shaped curve. ②The year 2009 in four phases witnessed the greatest landscape fragmentation, both Edge Density （ED） and Ingest Patch Index （LPI） increased, and human interference enhanced the overall landscape complexity. Measures were fotmulated in terms of deaf development goals, optimized allocation of land resoutces, effective protection of ecological ted lines, and definite ecological responsibility, so as to optimize the urban landscape pattern.

The Construction of an International Language Environment in the Core Urban Areas from the Perspective of Urban Planning

Urban planning is a process of government as planner to purposefully manage and intervene in the urban development. In this paper,five major tasks for the construction of an international language environment in the core urban areas are proposed from the perspective of urban planning:to explore an effective working mechanism for the construction of the international language environment;to improve the ability of citizens in foreign language communication;to standardize public bilingual notices and signs marking system;to innovate the internationalized operational models of the key industries;to create a multi-functional foreign language consulting service system. Thereby,the objective to improve the international language environment and competitiveness of the urban areas can be accomplished.

A Comparative Study on the Selected Area Electron Diffraction Pattern of Fe Oxide/Au Core-shell Structured Nanoparticles

The selected area electron diffraction （SAED） pattern of magnetic iron oxide core/gold shell nanoparticles has been studied. For the composite particles with mean size less than 10 nm, their SAED pattern is found to be different from either the pattern of pure Fe oxide nanoparticles or that of pure Au particles. Based on the fact that the ring diameters of these composite particles fit the characteristic relation for the fcc structure, the Au atoms on surfaces of the concerned particles are supposed to pack in a way more tightly than they usually do in pure Au nanoparticles. The driving force for this is the coherency strain which enables the shell material at the heterostructured interface to adapt the lattice parameters of the core.

乡村旅游地社会-生态系统恢复力演化差异及影响机理——基于长三角核心-边缘区比较实证

基于适应性循环理论和核心-边缘理论,利用集对分析法、向量自回归、系统动力学仿真等多元集成方法,对比分析核心-边缘区乡村旅游地社会-生态系统恢复力演化机理和路径差异。研究发现:①旅游业能够推动核心-边缘区乡村旅游地恢复力一体化均衡发展,恢复力差距呈逐渐缩小趋势。②核心-边缘区乡村旅游地恢复力系统内部复杂交互、协同有序发展。社会、经济和生态子系统互为非线性动态因果关系,在此非线性复杂自组织力作用下子系统之间的耦合协调度呈良好发展趋势。③通过复杂系统多情景模拟,核心区乡村旅游地发展路径以协调发展型或生态保护型为主,边缘区以旅游优先型为主。④驱动核心-边缘区乡村旅游地恢复力演化的要素系统具有差异性。在系统层面,生态系统对核心区影响程度最高,社会系统对边缘区的影响程度最高;在因素层面,生态因素是影响核心-边缘区乡村旅游地的共同要素,核心区能够通过生态修复提升生态韧性,边缘区能够利用生态优势转化为发展优势,进而均能显著提升乡村旅游地恢复力。

成渝地区双城经济圈国家战略腹地建设的内在逻辑、现实基础与路径选择

加强国家战略腹地建设是落实党的二十大作出“以新安全格局保障新发展格局”的战略部署,彰显了党中央统筹实现高质量发展和高水平安全动态平衡的重大战略考量。作为国家明确的战略腹地,同时叠加城市群成为区域发展的空间极核点与要素承载地的发展趋势,成渝地区双城经济圈主动服务和融入新时代国家战略腹地建设意义重大。“国家战略腹地”是邻近国家级的极核或先行地区,拥有经济高质量发展的基础和产业承接能力,能在一般或特殊时期支撑总体经济运行、承接产业转移、提供资源供给及保障生态安全,服务国家战略全局发展的内陆纵深区域。“国家战略腹地核心承载区”是成渝地区双城经济圈在国家战略腹地建设中的重要定位,担负着“以一域谋全局”的高质量发展价值追求,凝结了党中央统筹高质量发展和高水平安全的价值属性,是局部性和系统性并存的关键空间,是带动广大战略腹地高质量发展的重要增长极和新的动力源。新时代国家战略腹地核心承载区应具备经济组织活跃、产业部类齐备、要素供给充足、基础设施完善等发展优势。当前,成渝地区双城经济圈领有“扎实完备”的发展基础及产业体系、领有“保链稳链”的关键科技创新实力、具有“服务大局”的产业备份承接能力、富有“平战结合”的要素供应和设施支撑,已具备打造新时代国家战略腹地核心承载区的比较优势;但同时也存在区域空间结构发育不完全、高科技成果转化效能不强、区内产业同质化和显示度弱等薄弱环节。未来,成渝地区双城经济圈要以战略思维建设国家重要战略产业备份基地、以创新思维培育自主创新的区域创新体系与模式、以底线思维打造保障国家重要初级产品供给战略基地、以极限思维完善“平急转换”“平战结合”产业体系,努力打造新时代国家战略腹地核心承载区。

我国城乡高中一、二年级学生体质健康测试状况的调查研究

背景目前有关高中生体质健康测试成绩的研究以各省、市内局部地区较为多见,多中心大样本量的全域研究甚少。各类学校在普遍开展线上与线下混合式教学时,势必延长了高中生本已较长的静坐时间。这种趋势是否对高中生的体质健康产生一定的影响,亟待开展全域范围的调查研究。目的调查并分析我国七大地区城乡高中一、二年级学生的体质健康测试成绩水平及相关影响因素,探索出高中一、二年级学生的体质健康水平均衡提升的赋能路径。方法采用分层随机整群抽样方法,于2019年1—3月在我国31个省(直辖市、自治区)七大地区(华东、华南、华北、华中、西北、西南、东北)高中学校按照市区县与乡镇村进行分层抽样,然后随机整群分别选取市区县高中学校和乡镇村高中学校各1所,共62所学校42523名在读的高一、高二年级学生进行调研,同时收集学生的体质健康测试成绩数据(BMI反映身体发育水平,肺活量反映身体功能,坐位体前屈反映躯体柔韧度,引体向上、50 m跑、立定跳远反映上下肢爆发力量水平,1 min仰卧起坐反映躯体核心力量水平,800 m跑、1000 m跑反映心肺耐力水平),并运用非参数检验及多元线性回归分析探讨体质健康测试成绩水平的影响因素。结果42523名高中生的中位年龄为16.0(16.0,17.0)岁;男生20074名(47.2%)、女生22449名(52.8%),市县区21725名(51.1%)、镇乡村20798名(48.9%)。七大地区高中生性别、城乡分布比较,差异有统计学意义(P<0.05)。七大地区高中男生各项体质健康测试成绩比较,差异均有统计学意义(P<0.05);各项体质健康测试成绩前三的地区如下:身高(华北>东北>华中)、体质量(东北>华北>华中)、BMI(华中>东北>华北)、肺活量(东北>华中>华南)、50 m跑(华南>华中>华东)、立定跳远(华南>华北>西北)、坐位体前屈(华南>西南>华中)、引体向上(华南>西南>西北)、1000 m跑(华南>华中>西南)。市县区高中男生的肺活量成绩高于镇乡村,50 m跑、立定跳远、坐位体前屈、引体向上、1000 m跑成绩低于镇乡村(P<0.001)。七大地区高中女生各项体质健康测试成绩比较,差异均有统计学意义(P<0.05);各项体质健康测试成绩前三的地区如下:身高(华北>东北>西北)、体质量(东北>华北>西北)、BMI(东北>华北>西北)、肺活量(东北>华南>华中)、50 m跑(华南>华中>华东)、立定跳远(华南>华北>华中)、坐位体前屈(东北>华中>华南)、1 min仰卧起坐(华北>华中>华东=西南)、800 m跑(东北>华中>华南)。市县区高中女生的身高、体质量、BMI成绩高于镇乡村,肺活量、50 m跑、立定跳远、坐位体前屈、1 min仰卧起坐、800 m跑成绩低于镇乡村(P<0.001)。多元线性回归分析结果显示,男生引体向上成绩与BMI、1000 m跑成绩呈负相关,与50 m跑、立定跳远、坐位体前屈成绩呈正相关(P<0.05),坐位体前屈为最主要的影响因素,1000 m跑次之;1000 m跑成绩与BMI、肺活量、引体向上成绩呈负相关,与50 m跑、立定跳远、坐位体前屈成绩呈正相关(P<0.05),引体向上为最主要的影响因素,坐位体前屈次之。女生1 min仰卧起坐成绩与BMI、肺活量、立定跳远、800 m跑成绩呈正相关,与50 m跑、坐位体前屈成绩呈负相关(P<0.05),BMI为最主要的影响因素,坐位体前屈次之;800 m跑成绩与BMI、50 m跑、坐位体前屈成绩呈负相关,与立定跳远、1 min仰卧起坐成绩呈正相关(P<0.05),坐位体前屈为最主要的影响因素,BMI次之。结论我国市县区高中一、二年级男生的身体发育水平与镇乡村相当,但市县区高中一、二年级女生的身体发育水平高于镇乡村女生。市县区高中一、二年级学生的上下肢爆发力量、躯体核心力量、心肺耐力水平均显著低于镇乡村。除身体发育水平以外,华南地区的高中一、二年级男生的体质健康各项测试成绩水平的优势十分明显。

辽东半岛内生金矿床基本特征、成矿作用与资源潜力

辽东半岛是华北克拉通重要组成部分,中生代发生强烈的构造、岩浆活动和金矿成矿作用,其内部产有不同规模的金矿床,并具有明显的地域特色.通过系统总结辽东半岛金矿床的空间分布、赋矿围岩、控矿构造类型、矿化蚀变等基本特征和成矿作用,分析金矿的资源潜力.根据金矿床的空间分布,划分4个金矿集区,即:猫岭、白云-青城子、五龙-四道沟和新房金矿集区.猫岭和白云-青城子矿集区赋矿围岩为古元古代沉积变质岩系,矿化类型分为蚀变岩型和石英脉型,矿体主要受低角度层间断裂控制;五龙-四道沟矿集区赋矿围岩分别为中侏罗世片麻状黑云母花岗岩和古元古代沉积变质岩系,矿化类型以石英脉型为主,蚀变岩型次之,矿体受高角度断裂和低角度层间断裂控制;新房矿集区赋矿围岩为太古宙片麻岩和新元古界青白口系变质砂岩、变粒岩和大理岩,矿化类型为石英脉型和蚀变岩型,矿体多呈脉状受变质核杂岩剥离断层下盘发育的韧-脆性次级断裂和上部新元古界青白口系盖层构造裂隙控制.年代学研究表明,金矿成矿时代可分为晚三叠世(约220 Ma)、早侏罗世(约190 Ma)和早白垩世(约120 Ma).流体包裹体研究显示,流体不混溶是金矿成矿的主要机制;氢-氧同位素显示,成矿流体主要来自岩浆水,后期有大气降水加入;氦-氩同位素数据揭示,成矿流体主要来自壳源,少量来自幔源;硫-铅-锶同位素显示,成矿物质主要来自中生代岩浆.同时,赋矿地层起到不可或缺的作用.矿床地质特征及同位素数据显示,辽东半岛金矿为与岩浆热液有关的金矿床.结合区域构造大地构造演化,认为,辽东半岛晚三叠世金矿形成与扬子板块向华北板块深俯冲背景有关,早侏罗世金矿形成与古太平洋板块向欧亚板块俯冲挤压构造背景有关,早白垩世金矿形成于古太平洋板块向欧亚板块俯冲折返伸展环境.结合典型矿床地质特征、区域地球化学和地球物理特征,圈定找矿靶区23处,预测3000 m以浅金资源量2414.56 t.

襄阳邓城区域周代考古学文化的嬗变

以邓城城址为中心的邓城区域发掘了自西周中期至战国晚期的30余处考古学文化遗存,其文化面貌分别在春秋早、中期之际和战国中、晚期之际经历了两次突变,各以楚灭邓、秦拔邓为标志。同时,文化的突变也伴随着文化的渐变,并经历了文化交流、影响到主体文化控制的变化过程。此外,不同时期的文化面貌还与统治者及其治下的人群族属相关。

丝绸之路经济带核心区建设职业教育市域产教联合体实践研究

新疆处于丝绸之路经济带核心区,是我国西部地区的重要经济中心,也是我国重要的战略区域。当前,新疆在推动职业教育与地方经济发展联动方面,开始探索建立市域产教联合体,以促进产业升级和人才培养。在实践中,市域产教联合体面临着许多困难和问题。从政策环境、校企合作、人才培养、科技创新等方面,探讨新疆建设市域产教联合体面临的主要困难、问题和挑战。在此基础上,提出建设职业教育市域产教联合体的路径,包括政策支持、产学研合作、人才培养、社会参与等方面。

龙门山双复杂区表层结构调查方法研究

龙门山山前带地表地质条件复杂,浅表层速度及厚度差异大,给激发、接收和静校正等工作带来较大困难。表层调查工作直接影响到地下介质成像效果。为使该地区进行的地震勘探攻关能够获取准确的静校正量数据,给井深设计提供依据,研究适合该区域的表层调查方法,结合地质剖面、浅震、小层析、地面微测井、钻井取心、高密度电法、三分量共振表层调查方法的工作原理,分别应用不同方法做比对,分析了不同调查方法的应用效果。通过不同表层调查的比对,分析了不同方法的适用范围,为该区选择合适的表层调查方法及方法参数选取提供依据,同时为其他地表复杂区域进行表层调查提供参考。