Study on inelastic attenuation coefficient, site response and source parameters in Shanxi region

Based on 310 horizontal-component digital seismograms recorded at 14 seismic stations in Shanxi Digital Seis-mograph Network, the inelastic attenuation coefficient in Shanxi region is studied. By the methods of Atkinson and Moya, the site response of each station and several source parameters are obtained and the inversion results from both methods are compared and analyzed. The frequency-dependent inelastic attenuation coefficient Q is estimated as Q( f )=323.2 f 0.506. The site responses of 14 seismic stations do not show significant amplification, which is consistent with their basement on rock. We also found the dependence of corner frequency on seismic moment, seismic moment on stress drop, source radius on stress drop.

Investigation into dynamic response of regional sites to seismic waves using shaking table testing

This study addresses the changes in acceleration,pore water pressure and Fourier spectrums of different types of seismic waves with various amplitudes via large-scale shaking table tests from two sites:a sand-containing regional site and an all-clay site.Comparative analyses of the test results show that the pore water pressures in sand-soil layers of the regional site initially increase and then decrease as the amplitudes of the seismic accelerations increase.The actions of the vertical and vibrational seismic waves contribute to greater pore water pressures.The amplification coefficient of the sand-layer regional site becomes smaller as the seismic waves grow stronger,so that both sites are capable of filtering high frequencies and amplifying low frequencies of seismic waves.This is more apparent with the increase in the peak value of the acceleration,and the natural vibration frequencies of both sites decrease with the transmission of the seismic waves from the basement to the ground surface.The decreasing frequency value of the sand-containing regional site is smaller than that of the all-clay site.

Study on inelastic attenuation coefficient, site response and source parameters in Shanxi region

Based on 310 horizontal-component digital seismograms recorded at 14 seismic stations in Shanxi Digital Seis-mograph Network, the inelastic attenuation coefficient in Shanxi region is studied. By the methods of Atkinson and Moya, the site response of each station and several source parameters are obtained and the inversion results from both methods are compared and analyzed. The frequency-dependent inelastic attenuation coefficient Q is estimated as Q( f )=323.2 f 0.506. The site responses of 14 seismic stations do not show significant amplification, which is consistent with their basement on rock. We also found the dependence of corner frequency on seismic moment, seismic moment on stress drop, source radius on stress drop.

Analysis and prediction of exon, intron, intergenic region and splice sites for A. thaliana and C. elegans genomes

Although a great deal of research has been undertaken in the area of the annotation of gene structure, predictive techniques are still not fully developed. In this paper, based on the characteristics of base composition of sequences and conservative of nucleotides at exon/intron splicing site, a least increment of diversity al-gorithm (LIDA) is developed for studying and predicting three kinds of coding exons, introns and intergenic regions. At first, by selecting the 64 trinucleotides composition and 120 position parameters of the four bases as informational parameters, coding exon, intron and intergenic sequence are predicted. The results show that overall predicted accuracies are 91.1% and 88.4%, respectively for A. thaliana and C. ele-gans genome. Subsequently, based on the po-sition frequencies of four kinds of bases in regions near intron/coding exon boundary, initia-tion and termination site of translation, 12 position parameters are selected as diversity source. And three kinds of the coding exons are predicted by use of the LIDA. The predicted successful rates are higher than 80%. These results can be used in sequence annotation.

Characteristic Innovation of City Square at Guangxi Minority Nationality Regions

After description of the concept of urban feature with Nanning and Liuzhou City as example,the paper illustrated regional characteristics of Guangxi City and highlighted its cultural atmosphere of minority nationalities.It emphasized that only when regional urban feature was further enhanced could city development be promoted,and that only when urban feature was clearly identified could city square was characteristic.As for site selection of city square,it should follow principles of people-orientation,integrity,landscape,economy,ecology and geomancy.As for construction of city square,it should pay attention to integrate urban cultural feature based on relevant principles,and both inherit local historical culture and highlight local natural characteristic.In addition,folk artistic elements could be applied in city square,and folk artistic elements of nonmaterial culture could be integrated into the theme of city square.Material artistic elements could be also extracted and concluded as a kind of aesthetic art,reflected in concrete architectural forms.Characteristic innovation of city square should respect planning,start from city actuality,be based on self characteristics,consider citizens' willingness,and draw on local resources,so as to manifest regional cultural characteristic and promote city influence and competitiveness.

Ranking Regional Drought Events in China for 1960-2009

The spatiotemporal variations of the site and regional droughts in China during 1960–2009 were analyzed by applying a daily composite-drought index （CDI） to 722 stations in China's Mainland. Droughts frequently happened in a zone extended from Southwest China to the Yellow River, North China, and the southwestern part of Northeast China, with two centers of high frequency in North China and Southwest China. In Southwest and South China, droughts tend to happen during the winter. In North China and along the Yellow River, droughts mainly occur during the winter and during May–June. During the past 50 years, the geographical distribution of site drought events showed high frequencies （0.9–1.3 times per year） in the upper Yellow River basin and North China, comparing with moderate frequencies （0.6–0.9 times per year） in Southwest China and the southwestern part of Northeast China and with lower frequencies over the middle and lower Yangtze River basin. And the frequencies increased over China's Mainland except for the upper reaches of the Yangtze River. A regional drought （RD） event is a widespread and persistent event that covers at least five adjacent sites and lasts for at least 10 days. There were 252 RD events in the past 50 years—five times per year. Most RD events lasted for 100 days and covered 100 stations, but the longest and largest RD event lasted for 307 days from 6 September 1998 to 9 July 1999 and covered 327 stations from North to Southwest China.

Examining the Impact of Welfare Facilities on Building Construction Employee’s Performance in the Eastern Region of Ghana

Building Construction employees essentially required sufficient welfare facilities such as a place for washing, shower, change over, eat and drink, a place to store and hang clothing. Yet, these fundamental necessities are regularly disregarded. Decent welfare facilities can absolutely promote health and well-being and can aid to avert contracting diseases at building construction site. The aim of this study is to examine the impact of welfare facilities on building construction workers performance in the Eastern Region Ghana. The objectives were to identify welfare facilities provided by building construction firms, evaluate the satisfaction level of building construction firms’ employees with welfare facilities in Eastern Region, and determine the relationship between provision of welfare facilities and employee’s performance. The study employed convenient sample to investigate 80 building construction employees through questionnaires administration. Data generated from the survey was further analyzed using SPSS, weighted mean formula was used to determine the mean ranking, and descriptive and inferential statistics such as mean score, percentages, frequencies and chi square were used. The study reveals that the extent of welfare facilities at various construction sites was almost unavailability of sanitary and toilet facilities, unavailability of washing facilities, and unavailability of changing room, whiles drinking water and locker facilities were available but not sufficient. The study further finds that construction employees are dissatisfied with the condition of welfare facilities provided at their various work places. The study finally concludes that if workers are provided with decent welfare facilities at various building construction sites, it will motivate them to improve performance. The study recommends that metropolitan, municipal and district authority (MMDAs) should set a task force to check the implementation of welfare facilities at construction site as the results are pointing woeful insufficiency of welfare facilities at Eastern Region construction firms in Ghana.

辽西地区新石器时代文化空间分布特征及其演进预测研究

以辽西地区新石器时期的小河西文化、兴隆洼文化、赵宝沟文化、红山文化和小河沿文化遗址为研究对象,使用ArcGIS软件对各文化时期遗址数据进行提取,借助Logistic回归分析方法构建辽西地区新石器时期遗址的分布预测模型,得出遗址分布与海拔高程等自然地理要素之间的关系,生成辽西地区新石器时期遗址分布概率图。研究结果表明,辽西地区新石器时期聚落选址与自然地理要素关系密切,河流对遗址分布影响较大,海拔高程、坡度影响其次,坡向影响最弱。遗址预测模型显示较高概率分布区集中分布于距离河流较近的河谷、丘陵地带和地势较高的台地。预测模型可为探讨辽西地区史前人地关系演变提供重要参考,为考古发掘工作提供科学判断与决策支持,提高考古工作效率。

Human Enterovirus 71 DNA Vaccine Constructs Containing 5’UTR with Complete Internal Ribosome Entry Site Sequence Stimulated Improved Anti-Human Enterovirus 71 Neutralizing Immune Responses

Recent improvement in the technologies for efficient delivery of DNA vaccines has renewed interest in the DNA-based vaccines. Several DNA-based vaccines against human enterovirus 71 (EV71), the causative agent for hand, foot and mouth disease (HFMD) have been developed. Here we examined the potential of improving the vaccines by inserting the EV71 5’ untranslated region (5’ UTR) containing the full length internal ribosome entry site (IRES) sequence to the EV71 VP1-based DNA vaccine constructs. Four vaccine constructs designated as 5’ UTR-VP1/EGFP, VP1/EGFP, 5’ UTR-VP1/pVAX and VP1/pVAX, were designed using the pEGFP-N1 and pVAX-1 expression vectors, respectively. Transfection of Vero cells with the vaccine constructs with the 5’-UTR (5’-UTR-VP1/EGFP and 5’ UTR-VP1/pVAX) resulted in higher percentages of cells expressing the recombinant protein in comparison to cells transfected with vectors without the 5’-UTR (67% and 57%, respectively). Higher IgG responses (29%) were obtained from mice immunized with the DNA vaccine construct with the full length 5’ UTR. The same group of mice when challenged with life EV71 produced significantly higher neutralizing antibody (NAb) titers (>5-fold). These results suggest that insertion of the EV71 5’ UTR sequence consisting of the full length IRES to the EV71 DNA vaccine constructs improved the efficacy of the constructs with enhanced elicitation of the neutralizing antibody responses.

面向山区铁路工程物流基地选址的分布鲁棒优化模型

山区铁路传统工程建设运输物流基地选址模型较少将未来可能需求纳入考量范畴,忽视了此类临时工程在社会效益方面的可持续发展潜力。针对此问题,在传统工程建设运输物流基地选址模型考虑影响因素及假设基础上,加入永临结合决策变量,构建同时考虑未来社会需求分布的不确定性的工程选址模型。以工程地质条件、建设施工成本、道路情况等多个因素作为评价指标,采用预测未来社会需求并引入波动变量构建非精确机会约束的方式,提出适用于永临结合模式设施选址的“多面体-DRO”二阶段分布鲁棒模型。研究结果表明:服务水平是选址决策的主要影响因素;对于高海拔施工点,选择附近的高海拔设施更加可靠;为尽可能服务高海拔地区,永久设施点更倾向于在高海拔地区修建。建立的模型能够有效抵抗不确定性带来的代价,从而避免决策失误,在山区铁路工程永临结合设施修建方面有着重要理论价值和实际指导意义。

尾悬吊模拟失重对小鼠肝脏及结肠DNA甲基化谱的影响

目的通过全基因组甲基化捕获测序技术,在尾悬吊模拟失重条件下,筛选小鼠肝脏和结肠DNA甲基化的差异性位点和区域,探讨失重对基因甲基化的具体影响。方法实验采用6只8周龄的雄性C57BL/6J品系小鼠,随机分为尾吊组和对照组,每组3只,进行为期42 d的尾悬吊模拟失重实验。实验结束后,从肝脏和结肠组织中提取DNA,并利用全基因组甲基化捕获测序技术进行分析。结果肝脏组织的DNA分析显示,共发现7517个差异甲基化位点和997个差异甲基化区域,涉及4892个基因。结肠组织的DNA分析显示,共筛选出70340个差异甲基化位点和12004个差异甲基化区域,影响12877个基因。基因本体论(GO)、京都基因和基因组数据库(KEGG)生物路径分析结果表明,这些差异甲基化基因主要参与了蛋白质结合、细胞粘附、细胞活化以及多种代谢途径。结论本研究通过高通量测序技术成功鉴定了模拟失重条件下小鼠肝脏和结肠的差异甲基化位点和区域,这些发现有助于深入理解在太空长期驻留对生物体基因甲基化的影响,为太空飞行相关疾病的筛选、早期诊断和治疗提供新的研究思路。

区域性股权市场提升场内企业合规管理服务的思考

区域性股权交易市场作为我国多层次资本市场的重要组成部分,对场内企业提供融资服务和综合服务。在法治中国建设的大背景下,结合《中华人民共和国公司法》修订等法律建设内容以及“金税四期”工程的推进,充分认识中小微企业对企业合规管理的需求,主动积极拓宽场内企业合规管理服务路径,既能帮助场内企业提质增效,更能对地方经济稳定发展做出积极有益的贡献。

陕甘宁革命遗址时空分布特征及保护利用策略研究

陕甘宁革命遗址见证了中国共产党从胜利走向胜利的伟大历程,具有十分重要且特殊的地位.通过对陕甘宁革命遗址时空分布耦合特征的梳理,提出相应的保护利用策略,既是落实革命文物集中连片保护的政策要求,也是讲好中国共产党故事,弘扬革命精神的必要举措.选取陕甘宁片区1 316处革命遗址为研究对象,综合运用最近邻指数、核密度分析、空间基尼系数、标准差椭圆等量化方法,系统研究陕甘宁革命遗址在空间上的分布特征.主要结论如下:(1)革命遗址整体性强,不同类别的遗产凝聚区域不同.(2)革命遗址空间分布不均匀,围绕延安形成强核心特征,以延安为核心逐步呈现宏观区域差异.(3)革命遗址伴随着时间重心不断迁移,空间中的流线移动现象表明革命遗址在空间上呈现多要素节点特征.(4)建议对陕甘宁革命遗址进行全要素全时空的整体保护,构建“一圣地、两节点、四线路、五组团”的陕甘宁革命遗址活化利用网络体系.

宁夏黄土区典型坡面表层土壤有机碳含量的空间变化特征及尺度效应

【目的】定量认识土壤有机碳(SOC)含量在坡面上的空间异质性及尺度效应,探索“由点及面”估算坡面平均SOC含量的精确便捷途径,为细致刻画坡面土壤资源状况、全面理解生态系统碳循环、制定土壤高质量管理方案提供科学基础。【方法】在宁夏半干旱黄土丘陵区,选择3个相邻的由退耕还林工程形成的典型坡面,从坡顶向坡脚设置连续样点,调查各样点的土地利用、植被特征、立地条件及表层(0^20 cm)SOC含量,分析其坡向差异、坡位变化;以“离坡顶的水平距离或相对距离”为自变量,以表层SOC含量的顺坡滑动平均值为因变量,定量描述坡面尺度效应;再以坡面上任一样点表层SOC含量与坡面平均值的比值为因变量,实现由“点”到“面”的尺度上推。【结果】研究区表层SOC含量存在明显的坡向差异、坡位变化、尺度效应。表层SOC含量的坡面平均值在南坡(7.60 g·kg^(-1))最高,东坡(6.42 g·kg^(-1))次之,西坡(5.65 g·kg^(-1))最低,其坡位间变幅在东坡(15.95 g·kg^(-1))最大,其次为西坡(11.34 g·kg^(-1)),最小为南坡(9.72 g·kg^(-1)),说明东坡的坡面效应最强,其次为西坡,南坡最弱。东坡、西坡、南坡表层SOC含量的坡位变化大致相同,均由坡顶向下逐渐减小,至离坡顶水平距离200、150、280 m(相对距离0.73、0.45、0.76)后趋于稳定,主要与坡面“上部为自然状态的坡地+林草植被+恢复年限长、下部为人工梯田+林农植被+扰动频繁”的空间格局有关。在东坡、西坡、南坡上,距坡顶水平距离每增加100 m,SOC含量的滑动平均值分别变化-3.40、-2.50、-1.51 g·kg^(-1);距坡顶相对距离每增加0.1,SOC含量的滑动平均值分别变化-0.96、-0.75、-0.55 g·kg^(-1)。构建3个坡向不同坡位样点表层SOC含量与坡面平均值的比值随离坡顶水平距离或相对距离增加而变化的数量关系(R^(2)>0.7,P<0.001),籍此可由坡面上任一样点表层SOC含量精确便捷地估算坡面平均值。将所有位点数据融合得出,离坡顶相对距离0.4的位点表层SOC含量最接近坡面平均值。【结论】半干旱黄土丘陵区坡面表层SOC含量沿坡从上至下基本呈先减小后稳定的变化,与土地利用类型、植被类型、恢复年限的坡面分布格局有关。以顺坡(相对)水平坡长增加为尺度变量可较好地定量刻画表层SOC含量的坡面变化特征及尺度效应,藉此可实现坡面表层SOC含量平均值的精确便捷推算。

成都组团级站点影响区居住品质现状问题及影响因素研究

近年来,城市规模逐步扩张,大量轨道交通站点植入城市空间,对居住产生巨大冲击,导致居民对居住品质的需求与站点周边的物质空间环境存在较大矛盾。因此,文章对成都市6个组团级站点影响区域居住品质现状问题进行了调研与分析,得出居住品质影响因素与居住品质满意度的关系,总结适宜组团级站点影响区域居住品质的提升方法和相关提升设计策略。

基于关键区域特征匹配的生产现场隐患识别方法

为精准识别生产现场的各类隐患问题,避免不安全生产事件的出现,提出一种基于关键区域特征匹配的生产现场隐患识别方法。获取隐患信息关键区域特征,并定义隐患信息分类标准,完成基于关键区域特征匹配的生产现场隐患信息处理。排查隐患问题,并对其等级进行针对性评估,再联合相关参数指标确定隐患识别阈值的取值范围,完成基于关键区域特征匹配的生产现场隐患识别方法的设计。实验结果表明,利用所提方法可以准确识别出设备老化、操作不规范、物料储存不当这三类隐患问题,能够有效避免不安全生产事件的出现,符合实际应用需求。

地区社会网络与企业异地投资

基于2007—2021年我国A股上市公司异地投资数据,利用条件Logit、负二项回归与OLS等多种估计方法,考察了地区社会网络对企业异地投资区位选择的影响和作用机制。研究表明:地区社会网络显著影响企业异地投资区位选择,即地区社会网络越发达,越有利于吸引企业投资,该结论在一系列稳健性检验后仍然成立。机制分析表明:地区社会网络的信息传递功能、资源配置功能以及网络嵌入功能可以有效缓解投资企业面临的信息不对称与资源短缺等困境,提升企业新建子公司的风险抵抗能力;同时,地区社会网络亦能通过降低企业投资当地门槛,吸引企业投资。异质性分析表明:地区社会网络对非国有企业、制造业企业与近距离企业投资的影响更为明显。研究结论丰富了社会网络的研究层次与企业投资区位选择的文献,对企业提高投资效率与合理布局具有借鉴意义。

宁夏干旱区石灰岩矿山废弃地土壤改良及修复植物优选

为探索干旱区石灰岩矿山废弃地的生态修复方式,设置砂-土-有机肥(体积比2∶1∶1)、砂-土-复合肥(体积比2∶1∶1)、砂-土(体积比2∶1)、土-有机肥(体积比9∶1)4种土壤基质及柠条锦鸡儿(Caragana korshinskii Kom.)、细枝羊柴〔Corethrodendron scoparium(Fisch.et C.A.Mey.)Fisch.et Basiner〕、四翼滨藜〔Atriplex canescens(Pursh)Nutt.〕、沙拐枣(Calligonum mongolicum Turcz.)、蒙古莸(Caryopteris mongholica Bunge)、白刺(Nitraria tangutorum Bobrov)、短穗柽柳(Tamarix laxa Willd.)7种修复植物,对土壤理化性质及植物生长指标、叶片光合和叶绿素荧光指标进行比较,并利用主成分分析筛选最佳生态修复模式。结果显示:不同土壤基质方面,砂-土-有机肥的pH值、有机质含量和有效磷含量最高,土-有机肥的含水量、电导率和速效钾含量最高;砂-土-有机肥中四翼滨藜的新生枝月相对生长速率最高,砂-土-复合肥中四翼滨藜的株高和树冠面积最大;土-有机肥中四翼滨藜叶片的光补偿点最高但光饱和点和最大光合速率最低,砂-土-有机肥中四翼滨藜叶片的净光合速率、非光化学猝灭系数和最大光量子产量基本上显著(P<0.05)高于其他土壤基质;主成分分析筛选出的最优土壤基质为砂-土-有机肥。不同修复植物方面,短穗柽柳根际土壤的pH值、有机质含量、碱解氮含量和有效磷含量最高,柠条锦鸡儿根际土壤的电导率和速效钾含量最高;四翼滨藜的新生枝月相对生长速率显著高于其他植物;沙拐枣叶片的暗呼吸速率、光补偿点和最大光量子产量基本上显著高于其他植物,白刺叶片的表观量子效率显著高于其他植物,柠条锦鸡儿叶片的光饱和点最高且实际光量子产量和表观电子传递速率整体上显著高于其他植物,四翼滨藜叶片的最大光合速率和净光合速率基本上显著高于其他植物,细枝羊柴叶片的蒸腾速率和胞间CO_(2)浓度整体上显著高于其他植物,短穗柽柳叶片的气孔导度显著高于其他植物,蒙古莸叶片的非光化学猝灭系数整体上显著高于其他植物;主成分分析筛选出的最优修复植物为短穗柽柳。综合分析得出,在砂-土-有机肥中种植短穗柽柳可对宁夏干旱区石灰岩矿山废弃地进行有效生态修复。

从报刊角度重读香港地区文学——评赵稀方的《报刊香港:历史语境与文学场域》

赵稀方教授的《报刊香港》从报刊角度展现了香港地区百年文学风貌,深入探讨了香港地区的文学体制、文学流变、文学思潮、文学生产、文学观念等重大问题,在报刊史料的基础上完成了对于香港地区文学史的整理和定位,标志着内地地区对于香港地区文学史研究以及华文文学研究的进一步深化,在华文文学史的书写上实现了方法、理论、范式、内涵等几个方面的创新与突破。在文学史范式的更新、贯通海峡两岸暨香港地区、澳门地区的文学史与文学思潮、重建香港地区文学的主体性与特殊性、香港地区文学的史料建构、理论意义的彰显、重建冷战文化视野等方面为香港地区文学史重写打开了一个巨大的学术空间,进一步推进了华文文学学科建设的成熟与发展。

办公区室外公共空间对办公人员体力活动意愿的影响研究--以哈尔滨市为例

本研究以哈尔滨市行政办公区和行政办公人员为例,通过访谈行政办公人员,结合文献和调研结果,提取了公共空间影响体力活动的50个要素,并揭示了这些要素对体力活动意愿的影响:综合质量高的自然环境效果更佳;空间布置宜简洁、开阔;公共空间需根据个体喜好合理配置相应设施;冬季环境对体力活动意愿有正向影响,应丰富冬季特色景观和活动。