Natural gas exploration potential and favorable targets of Permian Fengcheng Formation in the western Central Depression of Junggar Basin,NW China

Based on the organic geochemical data and the molecular and stable carbon isotopic compositions of natural gas of the Lower Permian Fengcheng Formation in the western Central Depression of Junggar Basin,combined with sedimentary environment analysis and hydrocarbon-generating simulation,the gas-generating potential of the Fengcheng source rock is evaluated,the distribution of large-scale effective source kitchen is described,the genetic types of natural gas are clarified,and four types of favorable exploration targets are selected.The results show that:(1)The Fengcheng Formation is a set of oil-prone source rocks,and the retained liquid hydrocarbon is conducive to late cracking into gas,with characteristics of high gas-generating potential and late accumulation;(2)The maximum thickness of Fengcheng source rock reaches 900 m.The source rock has entered the main gas-generating stage in Penyijingxi and Shawan sags,and the area with gas-generating intensity greater than 20×10^(8) m^(3)/km^(2) is approximately 6500 km^(2).(3)Around the western Central Depression,highly mature oil-type gas with light carbon isotope composition was identified to be derived from the Fengcheng source rocks mainly,while the rest was coal-derived gas from the Carboniferous source rock;(4)Four types of favorable exploration targets with exploration potential were developed in the western Central Depression which are structural traps neighboring to the source,stratigraphic traps neighboring to the source,shale-gas type within the source,and structural traps within the source.Great attention should be paid to these targets.

Potential distribution of Haloxylon ammodendron in Central Asia under climate change

Understanding the spatial distribution of plant species and their dynamic changes in arid areas is crucial for addressing the challenges posed by climate change.Haloxylon ammodendron shelterbelts are essential for the protection of plant resources and the control of desertification in Central Asia.Thus far,the potential suitable habitats of H.ammodendron in Central Asia are still uncertain in the future under global climate change conditions.This study utilised the maximum entropy(MaxEnt)model to combine the current distribution data of H.ammodendron with its growth-related data to analyze the potential distribution pattern of H.ammodendron across Central Asia.The results show that there are suitable habitats of H.ammodendron in the Aralkum Desert,northern slopes of the Tianshan Mountains,and the upstream of the Tarim River and western edge of the Taklimakan Desert in the Tarim Basin under the current climate conditions.The period from 2021 to 2040 is projected to undergo significant changes in the suitable habitat area of H.ammodendron in Central Asia,with a projected 15.0% decrease in the unsuitable habitat area.Inland areas farther from the ocean,such as the Caspian Sea and Aralkum Desert,will continue to experience a decrease in the suitable habitats of H.ammodendron.Regions exhibiting frequent fluctuations in the habitat suitability levels are primarily found along the axis stretching from Astana to Kazakhskiy Melkosopochnik in Kazakhstan.These regions can transition into suitable habitats under varying climate conditions,requiring the implementation of appropriate human intervention measures to prevent desertification.Future climate conditions are expected to cause an eastward shift in the geometric centre of the potential suitable habitats of H.ammodendron,with the extent of this shift amplifying alongside more greenhouse gas emissions.This study can provide theoretical support for the spatial configuration of H.ammodendron shelterbelts and desertification control in Central Asia,emphasising the importance of proactive measures to adapt to climate change in the future.

Uncertainty Relations for Some Central Potentials in N-Dimensional Space

We study the uncertainty relation for three quantum systems in the N-dimensional space by using the virial theorem (VT). It is shown that this relation depends on the energy spectrum of the system as well as on the space dimension N. It is pointed out that the form of lower bound of the inequality, which is governed by the ground state, depends on the system and on the space dimension N. A comparison between our result for the lower bound and recent results, based on information-theoretic approach, is pointed out. We examine and analyze these derived uncertainties for different angular momenta with a special attention made for the large N limit.

INTRAOPERATIVE LOCALIZATION OF CORTICAL MOTOR EVOKED POTENTIALS IN CENTRAL SULCUS LESIONS

Objective To study direct cortical electrical stimulation technique for the recording of motor evoked potentials under general anesthesia in central sulcus lesions. Methods The largest N20-P25 response was recorded from postcentral gyrus by intraoperative monitoring of cortical motor evoked potentials in 10 patients with intracranial lesions near or in the central area. The muscles of upper extremity in all patients were activated by delivering stimulus to cortical areas continuously. Moving the cortical electrodes forward, the largest P20-N25 response, SEP phase reversal,was obtained as a motor center stimulus. In this site of cortex, a short train stimulation elicited reproducible muscle action potentials that could be observed from the oscilloscope without averaging.Results MEPs can be recorded, pre-and post-operatively, without motor deficits of upper limbs in all patients.Conclusion This technique seems to be preferable for intraoperative localization of motor evoked potentials in central sulcus lesions under total intravenous anesthesia.

Petroleum Potentials of the Nigerian Benue Trough and Anambra Basin: A Regional Synthesis

A review on the geology and petroleum potentials of the Nigerian Benue Trough and Anambra Basin is done to identify potential petroleum systems in the basins. The tectonic, stratigraphic and organic geochemical evaluations of these basins suggest the similarity with the contiguous basins of Chad and Niger Republics and Sudan, where commercial oil discovery have been made. At least two potential petroleum systems may be presented in the basins: the Lower Cretaceous petroleum system likely capable of both oil and gas generation and the Upper Cretaceous petroleum system that could be mainly gas-generating. These systems are closely correlative in temporal disposition, structures, source and reservoir rocks and perhaps generation mechanism to what obtains in the Muglad Basin of Sudan and Termit Basin of Niger and Chad Republics. They are very effective in planning future exploration campaigns in the basins.

Changes in somatosensory evoked potentials elicited by stimulation of upper-limb and lower-limb nerves in amyotrophic lateral sclerosis patients

This study observed the changes in somatosensory evoked potentials between patients with amyotrophic lateral sclerosis （ALS） and healthy controls to evaluate the function of the central deep somatosensory pathway. In patients with ALS, 28 patients （54%） showed an abnormality in somatosensory evoked potentials. All had abnormal lower limb somatosensory evoked potentials. Compared with healthy controls, the abnormality in somatosensory evoked potential was characterized by prolonged N20, P2, N2 latency and central conduction time, with or without a decrease in wave amplitude or disappearance of waveform. Results showed marked alterations in the somatosensory evoked potential in cortical components of the upper and lower limb in 54% of patients with ALS, and confirmed that patients with ALS may also have a defective deep somatosensory pathway, particularly an abnormal central deep somatosensory pathway.

Electroencephalogram and brainstem auditory evoked potential in 539 patients with central coordination disorder

BACKGROUND： Electroencephalogram （EEG） and brainstem auditory evoked potential （BAEP） are objective non-invasive means of measuring brain electrophysiology. OBJECTIVE： To analyze the value of EEG and BAEP in early diagnosis, treatment and prognostic evaluation of central coordination disorder. DESIGN, TIME AND SETTING： This case analysis study was performed at the Rehabilitation Center of Hunan Children＇s Hospital from January 2002 to January 2006. PARTICIPANTS： A total of 593 patients with severe central coordination disorder, comprising 455 boys and 138 girls, aged 1-6 months were enrolled for this study. METHODS： EEG was monitored using electroencephalography. BAEP was recorded using a Keypoint electromyogram device. Intelligence was tested by professionals using the Gesell scale. MAIN OUTCOME MEASURES： （1） The rate of abnormal EEG and BAEP, （2） correlation of abnormalities of EEG and BAEP with associated injuries, （3） correlation of abnormalities of EEG and BAEP with high risk factors. RESULTS： The rate of abnormal EEG was 68.6% （407/593 patients）, and was increased in patients who also had mental retardation （P 〈 0.05）. The rate of abnormal BAEP was 21.4% （127/593 patients）. These 127 patients included 67 patients （52.8%） with peripheral auditory damage and 60 patients （47.2%） with central and mixed auditory damage. The rate of abnormal BAEP was significantly increased in patients who also had mental retardation （P 〈 0.01 ）. Logistic regression analysis showed that asphyxia （P 〈 0.05）, jaundice, preterm delivery, low birth weight and the umbilical cord around the neck were closely correlated with abnormal EEG in patients with central coordination disorder, lntracranial hemorrhage, jaundice （P 〈 0.05）, low birth weight and intrauterine infection （P 〈 0.05） were closely correlated with abnormal BAEP in patients with central coordination disorder. CONCLUSION： Central coordination disorder is often associated with abnormal EEG and BAEP. The rate of EEG or BAEP abnormality is positively associated with the size of the brain injury. Asphyxia is a high risk factor for abnormal EEG in central coordination disorder. Jaundice and intrauterine infection are high risk factors for abnormal BAEP in central coordination disorder.

Determine the Eigen Function of Schrodinger Equation with Non-Central Potential by Using NU Method

So far, Schrodinger equation with central potential has been solved in different methods but solving this equation with non-central potentials is less dealt with. Solving such equations are way more difficult and complicated and a certain and limited number of non-central potentials can be solved. In this paper, we introduce one of the solvable kinds of such potentials and we will use NU method for solving Schrodinger equation and then by using this method we have calculated particular figures of its energy and function.

Utility of somatosensory and motor-evoked potentials in reflecting gross and fine motor functions after unilateral cervical spinal cord contusion injury

Fine motor skills are thought to rely on the integrity of ascending sensory pathways in the spinal dorsal column as well as descending motor pathways that have a neocortical origin.However, the neurophysiological processes underlying communication between the somatosensory and motor pathways that regulate fine motor skills during spontaneous recovery after spinal cord contusion injury remain unclear.Here, we established a rat model of cervical hemicontusive injury using C5 laminectomy followed by contusional displacement of 1.2 mm(mild injury) or 2.0 mm(severe injury) to the C5 spinal cord.Electrophysiological recordings were performed on the brachial muscles up to 12 weeks after injury to investigate the mechanisms by which spinal cord pathways participate in motor function.After spinal cord contusion injury, the amplitudes of somatosensory and motor-evoked potentials were reduced, and the latencies were increased.The forelimb open field locomotion test, grooming test, rearing test and Montoya staircase test revealed improvement in functions.With increasing time after injury, the amplitudes of somatosensory and motor-evoked potentials in rats with mild spinal cord injury increased gradually, and the latencies gradually shortened.In comparison, the recovery times of somatosensory and motor-evoked potential amplitudes and latencies were longer, and the recovery of motor function was delayed in rats with severe spinal cord injury.Correlation analysis revealed that somatosensoryevoked potential and motor-evoked potential parameters were correlated with gross and fine motor function in rats with mild spinal cord contusion injury.In contrast, only somatosensory-evoked potential amplitude was correlated with fine motor skills in rats with severe spinal cord injury.Our results show that changes in both somatosensory and motor-evoked potentials can reflect the changes in gross and fine motor functions after mild spinal cord contusion injury, and that the change in somatosensory-evoked potential amplitude can also reflect the change in fine motor function after severe spinal cord contusion injury.This study was approved by the Animal Ethics Committee of Nanfang Hospital, Southern Medical University, China(approval No.NFYY-2017-67) on June 11, 2017.

Analysis of Oscillatory Potentials of Flash Electroretinogram in Frequency Domain and Time Domain in Retinal Vein Occlusion

Purpose: To analyse the parameters of frequency domain and time domain of the OPs in branch retinal vein occlusion (BRVO) and central retinal vein occlusion (CRVO). Methods : OPs from 9 eyes of BRVO, 9 eyes of CRVO and 40 normal control eyes were tested . The frequency spectra of the OPs were derived through Fast Fourier Transform (FFT) . The mean frequency spectra, the total power, the maximum magnitude, the maximum power and the dominant frequency in frequency domain of the OPs from the eyes of BRVO, CRVO and the normal control group were compared with each other. The OPs waveforms were reconstructed with the OPs frequency spectra data by counter-FFT. In time domain, the latencies, the amplitudes and the sum of the amplitudes of the four wavelets of OPs were measured and compared in the above subjects.Results: There were no statistically significant differences in the magnitudes of frequency spectra, the total power, the maximum magnitude and the maximum power in the frequency range from 110 to 250

准噶尔盆地中央坳陷西部下二叠统风城组天然气勘探潜力与重点领域

基于准噶尔盆地中央坳陷西部下二叠统风城组烃源岩有机地球化学、天然气组分和稳定碳同位素组成等分析数据,结合区域沉积环境与生烃演化模拟实验,评价风城组烃源岩的生气潜力,刻画规模有效源灶分布,厘定天然气成因来源,优选有利勘探领域。结果表明:(1)风城组为1套倾油型烃源岩,但滞留液态烃有利于晚期裂解成气,具有生气潜力大、晚期规模成藏的特点;(2)风城组烃源岩最大厚度可达900 m,盆1井西凹陷和沙湾凹陷已进入规模生气阶段,生气强度大于20×10^(8) m^(3)/km^(2)的面积约6 500 km^(2);(3)环中央坳陷西部发现的碳同位素组成较轻的天然气主要为来自风城组烃源岩的高熟油型气,其他则为来自于石炭系煤系烃源岩的煤成气;(4)中央坳陷西部天然气勘探需重点关注源边构造型、源边地层型、源内页岩气型和源内构造型4种类型的有利勘探领域,其勘探潜力值得期待。

2005-2020年亚洲中部干旱区生态站月潜在蒸散量数据集

潜在蒸散表征大气蒸发能力,是衡量区域蒸发能力的重要指标,也是评价气候干旱程度变化、水资源供需平衡、植被耗水量等的关键参数。在收集中亚生态系统监测网络12个生态站和中国生态系统研究网络(CERN)11个位于西北干旱区生态站的气象观测数据基础上,经过数据质量控制与插补,采用Penman-Monteith模型计算潜在蒸散量,生成了2005-2020年亚洲中部干旱区生态站月潜在蒸散量数据集。本数据集时间序列较长、覆盖多种生态系统类型,可作为亚洲中部干旱问题研究的基础数据、模型输入数据、模拟结果验证数据等,也可为该区域水资源的合理开发与利用、生态环境保护等方面研究提供数据支撑。

黔中磷矿区土壤重金属污染及其生态风险评价

为评价黔中磷矿区土壤重金属污染风险,采用梅花布点法在磷矿区周边区域和无矿区不同地层天然土壤采集24件表层土壤样品,测定Cu、Pb、Zn、As、Hg、Se、Cd、和Cr含量,并采用内梅罗综合污染指数(NPI)、地累积指数(I_(geo))以及Hankanson潜在生态危害指数(RI)对磷矿区土壤重金属的污染程度和潜在生态风险进行评价。结果表明,黔中磷矿区土壤中Hg、Se、Cd、As、Pb、Zn和Cr等元素平均含量分别为贵州土壤背景值的37.58倍、24.40倍、19.26倍、18.09倍、2.67倍、2.17倍和1.78倍,各重金属富集特征明显,Cu元素平均含量未超过贵州省土壤背景值。研究区土壤中Hg、Se、Cd、As、Pb、Zn和Cr等元素NPI平均值介于4.59~69.32之间,处于重度污染水平,而Cr和Cu元素NPI平均值分别为1.89和1.21,处于轻度污染水平。研究区Hg元素I_(geo)平均值为4.45,处于严重至极重污染;As、Se和Cd元素I_(geo)平均值介于3.35~3.65之间,处于重度污染;Pb、Zn和Cr元素I_(geo)平均值0.21~0.44之间,处于未污染至中度污染水平,而Cu元素I_(geo)平均值为-0.83,显示其未受到污染。潜在生态风险评价结果表明,研究区土壤Hg元素处于极强生态风险水平,Cd处于强生态风险水平,Ad处于中等生态风险水平,而Cu、Pb、Zn和Cr均处于轻微风险水平。黔中磷矿区土壤RI平均值为2285.50,显示出极强生态风险,Hg是最主要的生态风险元素,应引起高度重视。

中国与中亚国家跨境电商贸易潜力及创新模式研究

中亚五国地处丝绸之路经济带,是中国与“一带一路”沿线国家贸易增长最快的区域。近年来,伴随数字经济全球化,中国与中亚国家跨境电商贸易快速发展。科学测度各国跨境电商发展水平,找准有利因素,深入挖掘中国与中亚国家跨境电商贸易增长潜力,并且探索适宜的发展模式,对于促进贸易高质量发展和形成新发展格局意义重大。首先,本研究运用主成分分析法,从互联网通信技术水平、物流效率、通关效率和教育科研水平方面的十一项指标构建综合指标体系客观地评价中亚国家跨境电商发展水平,得出以下结论:在考察期内,中亚五国的跨境电商发展水平有提高的趋势,各国跨境电商发展水平也呈现出明显的差异,乌兹别克斯坦跨境电商发展水平名列中亚五国首位。其次,采用中国与中亚五国跨境电商贸易相关面板数据,运用拓展引力模型对中国与中亚国家跨境电商贸易影响因素及潜力进行量化评估,实证结果表明:在研究期内,经济发展水平、跨境电子商务发展水平、互联网应用以及对外开放水平等因素对中国与中亚五国跨境电商进出口贸易有显著促进效应,意味着随着经济增长,跨境电子商务发展水平提升,互联网应用更为广泛以及对外开放的层次和水平不断提高,中国对中亚国家跨境电商贸易潜力将不断释放。最后,基于拓展引力模型测度潜力值的大小,从“潜力再造型、潜力拓展型、潜力巨大型”对中国与中亚五国的跨境电商贸易潜力状态进行分类,从而分类施策,进一步挖掘跨境电商贸易潜力,积极探索跨境电商新模式,构建网络空间命运共同体和更加紧密的中国—中亚命运共同体。尤其,抢抓中国(新疆)自由贸易试验区建设契机,积极服务和融入新发展格局,以跨境电商驱动中国与中亚国家贸易高质量发展,有效支撑丝绸之路经济带建设,推进“一带一路”行稳致远。

郑州市中心城区古树资源特征分析及保护对策

基于2018年郑州市古树普查数据及实地调研数据,利用Excel、ArcGIS、SPSS等软件对郑州市中心城区古树资源现状及保护现状进行分析。调查结果显示,郑州市中心城区古树共222株,属于17科26属27种,其中一级古树数量最多,三级古树数量最少,树龄结构稳定,生长态势良好;古树资源呈聚集状态,并多分布于生态环境良好的地区;古树生长主要受环境、土壤、市政建设、养护、病虫害、人为损害等影响;古树保护中存在保护措施粗放、保护力度不够、专业队伍缺失、财政保护资金不足、古树保护宣传力度弱等问题。以期为城市中的古树名木的调查统计和保护提供了数据依据及具有科学性和实施性的策略。

国际贸易新形势下中国农产品出口中亚五国贸易效率及潜力研究

面对当今全球经济形势动荡、政治环境复杂、文化冲突不断的国际新形势,文章对2001-2020年中国与中亚五国农产品贸易进行总结。使用时变随机前沿引力模型,探究影响中国农产品出口中亚国家的主要影响因素,进一步测算了中国农产品出口中亚国家的贸易效率和贸易潜力,对经济规模、政治环境、人口因素、地理位置等变量进行实证分析。研究结果表明,经济规模、政治环境、人口规模等因素能够正向促进中国对中亚国家的农产品出口。此外,中亚国家农业产值占本国GDP比值与贸易效率呈现负相关关系,而法律法规完善程度和WTO等贸易非效率项显著提高中国的农产品出口贸易效率。根据研究结论,文章提出如下建议:积极参与国际治理;开展友好磋商;坚定文化自信和促进文化交流;发展跨境电商等外贸新业态。

风险预警分级管理在ICU中心静脉导管相关性血流感染预防中的应用

目的探讨风险预警分级管理在重症监护病房(ICU)中心静脉导管相关性血流感染(CLABSI)预防中的应用效果。方法选取2022年1月-2023年8月我院ICU行中心静脉置管治疗的患者82例为研究对象,采用抽签法分为对照组和观察组,各41例。对照组行常规管理,观察组在常规管理的基础上行风险预警分级管理。比较两组CLABSI发生率、导管留置时间、ICU住院时间及ICU护理人员感染控制能力。结果观察组CLABSI总发生率低于对照组,导管留置时间、ICU住院时间短于对照组(P<0.05);观察组管理后护理人员感染控制能力评分高于对照组(P<0.05)。结论风险预警分级管理在ICU中心静脉置管患者的应用可降低CLABSI发生率,缩短导管留置时间及ICU住院时间,提高护理人员感染控制能力。

玛湖凹陷三叠系百口泉组地层再认识与勘探潜力分析

为进一步探索玛中平台区近4000.0 km 2勘探空白区的勘探潜力,扩大玛湖凹陷百口泉组勘探潜力,实现玛湖凹陷整体突破,综合利用地质、钻井、高精度地震等资料,对玛湖凹陷百口泉组地层划分进行了细化,将玛中平台区低位域砂体划分为百口泉组零段(百零段)。在此基础上,结合区域沉积、构造背景,从烃源岩条件、疏导体系、沉积体系和成藏条件等方面对玛中平台区低位域百零段油气成藏条件及控制因素展开了综合分析。研究表明:二叠系风城组烃源岩具有碱湖双峰式生油特征,油气资源基础大,百零段更近源,更容易捕获深层油气;玛中平台区印支期走滑断裂直插深层烃源岩,搭接形成了高效的输导体系;百口泉组顶底板条件优越,百零段在大型地层超覆背景下叠置发育多期湖侵退积砂体,形成规模有效的储盖组合;百零段发育四大规模扇体,其扇三角洲平原亚相致密带、扇间泥岩、构造等值线相互配置,形成复合式多面遮挡,为扇三角洲前缘大面积成藏奠定了基础。类比研究认为,中拐扇前缘亚相上倾、侧向遮挡条件好,具有宏观整体成藏基础。该区前缘亚相有利勘探面积大,岩性目标叠置发育,落实程度高,是目前寻求百零段新层系突破的重点勘探目标。百零段的突破有望打开玛中平台区勘探局面,进而实现玛湖凹陷百口泉组整体突破。

等速肌力训练对脑卒中后偏瘫患者上肢的影响

目的探究等速肌力训练对脑卒中后偏瘫患者上肢的影响。方法选取2022-07—2023-07石家庄市人民医院收治的99例脑卒中后偏瘫患者,采用随机数字法分为常规组49例和观察组50例,常规组给予常规康复治疗,观察组在常规康复治疗基础上给予等速肌力训练。比较训练前和训练4周后,2组患者运动皮层兴奋性[患侧半球运动诱发电位(MEP)潜伏期、中枢运动传导时间(CMCT)]、手力量、生活自理能力[改良Barthel指数量表(MBI)]。结果训练4周后,2组患者MEP、CMCT较训练前降低,观察组MEP[(14.57±1.25)ms]、CMCT[(8.29±1.03)ms]低于常规组[(15.86±1.32)ms、(8.96±1.06)ms](P<0.05);2组患者握力及MBI评分均较训练前升高,观察组握力[(22.42±2.38)kg]、MBI评分[(62.78±6.33)分]高于常规组[(20.15±2.24)kg及(60.17±6.21)分](均P<0.05)。结论等速肌力训练能够改善运动皮层兴奋性,增强手力量,提高生活自理能力。

政治势能何以转化为治理效能?——以中央环保督察制度为例

“政治势能”是中国本土政治学术话语,是“高位推动”的学理性表达,其核心理念是“党的领导在场”。在国家治理实践中,政治势能是公共政策得以有效执行的关键所在。作为一项创新性制度安排,中央环保督察制度在推进我国生态文明建设和环境保护工作中发挥了重要作用。通过“政治势能”的分析框架,可以透视中央环保督察中政治势能的运作逻辑,分析政治势能向治理效能的转化机制,研究发现:中央环保督察中政治势能通过“形成趋势—构建权势—宣传造势—形成共识—借势成事”五个层次发挥作用,并通过资源整合机制、激励机制和问责机制的耦合、舆论监督和公众参与机制实现治理效能的转化。在未来的环保督察实践中,需要通过制度性嵌入环保督察制度,避免环保督察整改策略性行为,以及平衡问责与避责的张力,以此激发环保督察制度的潜能,实现政治势能的优化。