The Protective Role of Xanthophyll Cycle in Resurrection Angiosperm Boea hygrometrica During Dehydration and Rehydration

The protective role of xanthophyll cycle in resurrection angiosperm Boea hygrometrica (Bunge) R.Br. was investigated by analysis of the changes of chlorophyll fluorescence and xanthophyll cycle components in response to dehydration and rehydration in detached leaves under very weak light condition (3 mumol photons.m(-2).s(-1)) and in the dark. With declines in the values of PSII photochemical efficiency (Fv/Fm), PSII actual quantum yield (Phi(PSII)), photochemical quenching (qP) and non-photochemical quenching (NPQ) during dehydration, zeaxanthin significantly increased in control Boea leaves under very weak light condition, while no zeaxanthin accumulation was detected in Boea leaves treated with dithiothreitol (DTT) and Boea leaves in the dark, and after 3 d rehydration, the parameters Fv/Fm, Phi(PSII), qP and NPQ showed full recovery in control Boea leaves under very weak light condition, but the parameters only underwent partial recovery in Boea leaves treated with DTT and Boea leaves in the dark, suggesting that the recovery of photosystem II (PSII) photochemical activities in Boea leaves was obviously affected by treatments with DTT and darkness, therefore, zeaxanthin may play an important protective role in desiccated Boea leaves even under very weak light conditions.

Photosynthesis of Resurrection Angiosperms

Resurrection plants which are able to quickly reactivate after falling into a period of anabiosis caused by dehydration have been very rare among angiosperms, especially among dicotyledons whose chlorophyll content and chloroplast structure little changed in the course of desiccation, therefore has been called homoiochlorophyllous desiccation-tolerant plants (HDTs). Another type of resurrection angiosperms that lost its chlorophyll dining desiccation is called poikilochlorophyllous desiccation-tolerant plants (PDTs). HDTs have been received more attention because of simplicity of protection mechanism which is much easy to the study and utilization of the desiccation tolerance of resurrection angiosperms. Recent advances in studies of photosynthesis of resurrection angiosperms indicate that photochemical activities are sensitive indicators for the study of physiological state of resurrection angiosperms during desiccation and rehydration. Photochemical activities of resurrection angiosperms are inhibited with loss of water similar to those of general plants, however, the magic thing is that they could reactivate rapidly during rehydration even losing more than 95% water. Up-regulations in xanthophyll cycle and antioxidative systems as well as preservation in integrity and stability of photosynthetic membranes during desiccation may be very important to desiccation tolerance of resurrection angiosperms. The fact that phosphate treatment in rehydration stage also strongly influences resurrection indicated importance of studies on rehydration stages of resurrection angiosperms.

Comparison of Photosynthetic Pigment Contents of the Resurrection Plants <i>Ramonda serbica</i>and <i>Ramonda nathaliae</i>of Some Different Populations from Kosovo, Albania and Macedonia

The resurrection plants Ramonda serbica and Ramonda nathaliae are the physiological model plant and endemic species from Balkan Peninsula. Study was carried out to assess the impact of different populations on photosynthetic pigment contents and their effect on physiological activity of these species. The experiment was conducted with leaves of R. serbica collected from nine populations in Kosovo, three in Albania and two in Macedonia, while for R. nathaliae four populations in Macedonia. For this purpose plants after collection from their natural populations were kept for 24 hours at constant temperature and humidity and in natural photoperiod. According to our data the pigment contents (Total chl + Carot) of R. serbica, measured as mg per gram dry weight (DW), were higher (7.06 mg·g-1 DW) in Radaci populations (Kosovo) and lower (4.63 mg·g-1 DW) in Jukniu Mountain-Kruja (Albania). On the other hand, the higher (5.28 mg·g-1 DW) of pigment contents (Total chl + Carot) of R. nathaliae were observed in Vorca populations and the lower (4.24 mg·g-1 DW) in Kaparll?k populations. Ratio chlorophyll a/b of R. serbica in Kruja Castle populations from Albania was the higher (3.68) comparing with Zhlebi populations from Kosovo (1.68). Similarly in case of R. nathaliae the higher (3.36) value was in Kaparll?k populations and the lower (3.12) in Matka populations. The data obtained were further analyzed using one-way ANOVA and a significant change was recorded in the different populations. These studies clearly indicate that the Ramonda plants from different ecological habitats there have been changes of photosynthetic pigment contents.

Resurrection of GSM Core Network at WCDMA Age

The developing mobile technologies have resulted in operators focusing on how to optimize their 2G networks and ensure a smooth network end, there are two approaches for upgrade: one core network with a 2G-radio network, while the other is (Mobile Switching Center) with WCDMA MSCS (Mobile Gateway) to optimize the Core network hierararchy

Markov branching processes with immigration-migration and resurrection

We consider a modified Markov branching process incorporating with both state-independent immigration-migration and resurrection. The effect of state-independent immigration-migration is firstly in- vestigated in detail. The explicit expressions for the extinction probabilities and mean extinction times are presented. The ergodicity and stability properties of the process incorporating with resurrection structure are then investigated. The conditions for recurrence, ergodicity and exponential ergodicity are obtained. An explicit expression for the equilibrium distribution is also presented. As a preparation, the criteria for regularity and uniqueness for such structure are firstly established.

Existence,uniqueness and ergodicity of Markov branching processes with immigration and instantaneous resurrection

We consider a modified Markov branching process incorporating with both state-independent immigration and instantaneous resurrection.The existence criterion of the process is firstly considered.We prove that if the sum of the resurrection rates is finite,then there does not exist any process.An existence criterion is then established when the sum of the resurrection rates is infinite.Some equivalent criteria,possessing the advantage of being easily checked,are obtained for the latter case.The uniqueness criterion for such process is also investigated.We prove that although there exist infinitely many of them,there always exists a unique honest process for a given q-matrix.This unique honest process is then constructed.The ergodicity property of this honest process is analysed in detail.We prove that this honest process is always ergodic and the explicit expression for the equilibrium distribution is established.

Markov branching processes with killing and resurrection

In this paper, we consider Markov branching processes with killing and resurrection. We first show that the Markov branching process with killing and stable resurrection is just the Feller minimum process which is honest and thus unique. We then further show that this honest Feller minimum process is not only positive recurrent but also strongly ergodic. The generating function of the important stationary distribution is explicitly expressed. For the interest of comparison and completeness, the results of the Markov branching processes with killing and instantaneous resurrection are also briefly stated. A new result regarding strong ergodicity of this difficult case is presented. The birth and death process with killing and resurrection together with another example is also analyzed.

Cultural Resurrection

"Who are we?Where are we from?"Humans have been pondering these questions since the day they first came into being.One of the ways we preserve memories of the past is through our cul- tural heritage that has been passed on from generation to genera- tion.Intangible cultural heritage,as well as tangible cultural her- itage,is essential to the continuity of human civilization. Since the United Nations Educational,Scientific and Cultural Organization(UNESCO)unveiled the Masterpieces of the Oral and Intangible Heritage of Humanity in 2001,China has had Kunqu opera,Guqin and its music,the art of Uygur Muqam of Xinjiang and the traditional Mongolian folk song Long Song added to UNESCO’s protection list.It is now one of the coun-

甘肃舟曲江顶崖古滑坡复活变形特征与稳定性分析

为研究江顶崖古滑坡复活变形特征与稳定性,通过历史资料调研、现场踏勘与监测、卫星遥感和室内土工试验等方法,分析了主滑坡体、滑坡后壁及侧壁的变形特征与稳定性。结果表明:滑体前缘高陡边坡因降雨及河流冲刷导致坡脚失稳;中后部土体受地下水、连续强降雨影响,抗剪强度降低,下滑力增大,逐步向前推移;最终由于前缘土体的滑动,导致抗滑力减小,随之引发整体滑动,为缓慢滑动的牵引式滑坡。滑体后壁、两侧侧壁高陡,变形迹象明显,在强降雨或地震工况下易失稳滑动。江顶崖滑坡具有长期蠕滑变形、多次复活滑动等特点,是甘肃省近年来规模、范围最大的滑坡之一,在地震或暴雨作用下,滑坡有再次复活的可能,建议加强对滑坡区的变形监测,同时,对区域内不稳定斜坡进行加固治理,防止出现重大灾害。

金沙江上游扎马古滑坡复活特征及堵河危险性分析

随着人类工程活动不断加剧和极端天气的频繁出现,古滑坡复活堵江问题日益突出,严重威胁着山区城镇安全。以金沙江上游巴曲右岸扎马特大古滑坡为例,采用无人机航测、现场精细调查和数值模拟分析等方法,查明了古滑坡复活特征,剖析了不同重现期降雨条件下滑坡的稳定性和失稳概率,模拟研究了不同工况下滑坡运动过程、堆积范围及堵河危险性。结果表明:(1)扎马古滑坡前缘局部复活主要表现为地表变形迹象清晰,呈现牵引式渐进破坏的特点,前缘复活区体积约185万m^(3),存在进一步失稳滑动可能;(2)滑坡前缘在天然状态下稳定,20年一遇的月极值降雨条件下处于不稳定状态,失稳概率为87.95%,50年、100年一遇的月极值降雨条件下前缘与后部整体处于不稳定状态,失稳概率分别为58.75%、68.60%;(3)前缘失稳或前缘与后部连续失稳后,滑坡体在沟口处达到的最大速度分别为9、11 m s,滑移距离最远可达480 m,在巴曲沟道形成高度约42~48 m的堰塞坝;(4)堵塞巴曲后形成的回水可能淹没滑坡上游德达乡段G318国道、居民建筑及场站等基础设施,涉及范围约0.81~1.02 km^(2),形成的堰塞湖可能在7天内发生漫坝,应引起重视。

基于SBAS-InSAR技术的雅鲁藏布江色东普沟地质灾害发育特征与复活趋势分析

随着全球气候不断变暖,青藏高原发生地质灾害的频率和危害强度大幅增加,对川藏铁路沿线的滑坡泥石流进行及时有效的监测和防治具有重要意义。文章选取了2016年7月至2020年1月之间的Senti⁃nel-1A数据,解译和分析了区域内地物发生的变化情况,采用SBAS-InSAR技术对雅鲁藏布江沿岸的色东普沟发生高位冰崩地质灾害链致灾过程和复活趋势进行了研究。结果表明:依据区域内时序相关性的变化情况推断出的灾害事件与SBAS-InSAR的灾害探测结果具有高度一致性,SBAS-InSAR对冰崩-岩崩-滑坡泥石流等灾害链进行监测是一种有效的手段;色东普沟自2018年致灾以来,新增5处变形体,累计形变量均已超过40 mm,存在复活迹象。随着气候变暖、降雨量增加、冰川消融,色东普沟在今后相当长的时期内仍会保持此类灾害事件的高发频发态势,应进一步加强该区域地灾监测,提前开展防治工作。

基于VE-GEP算法的PM_(2.5)浓度预测

准确预测PM_(2.5)浓度对于公众健康和环境保护具有重要意义,但其非线性、多变性以及复杂性的特点导致难以准确预测.基于此,本文针对传统GEP存在的不足,提出了一种基于病毒进化的基因表达式编程算法(VE-GEP)来预测PM_(2.5)浓度.该算法在GEP的基础上引入了复活机制与诱变重启机制.复活机制能去除种群中的劣质个体,改善种群中个体的质量;诱变重启机制通过引入优质基因和新的个体,提高种群的多样性,增强算法的寻优能力.实验结果表明, VE-GEP算法相较于GEP、DSCE-GEP和CNN-LSTM在春季、夏季和秋季中的预测模型均有不同程度的提高,拟合度分别提高1.28%/0.1%/0.13%、1.86%/1.29%/0.42%、0.57%/0.24%/0.29%,为PM_(2.5)浓度预测研究提供了新的思路和方法.

甘肃舟曲江顶崖古滑坡形成演化机理与堆积体稳定性评价

古滑坡堆积体复活是我国青藏高原及周边地区的主要地质灾害类型之一,也是我国西部正在建设的重大交通和水利工程面临的主要安全威胁之一。因此,对古滑坡的形成演化机理进行研究并对其堆积体进行稳定性评价,显得极为重要,可以为古滑坡堆积体复活的早期识别与防治设计提供理论支持。甘肃省舟曲县江顶崖古滑坡堆积体近十年来数次局部复活形成滑坡堵塞白龙江,对当地人民的生命财产安全造成严重威胁。通过现场调查和无人机倾斜摄影等手段,查明了江顶崖古滑坡堆积体的形态和结构特征,在此基础上分析了滑坡的演化机理和动力学过程,再结合InSAR变形数据对堆积体的稳定性进行了定性评价。结果显示,江顶崖古滑坡是典型的大型地震滑坡,其滑体沿3个方向坐落式下滑,形成了如今多级台阶状的堆积体形态;在地震荷载作用下古滑坡的动力学过程可分为中上部震动-拉裂、前缘锁固段剪断-滑坡启动、后缘拉裂-滑体加速、前缘受阻-滑体减速、稳定阶段。由于古滑坡在地震荷载作用下整体下滑,导致上部堆积体内存在大量结构完整的岩体,因此较为稳定;而中下部堆积体大都为断层破碎带和破碎岩体组成的软弱结构,稳定性较差,未来极有可能复活。

甘肃岷县阳坡村大型古滑坡发育特征与稳定性评价

青藏高原东北缘地质环境条件复杂,在内外动力耦合作用下发育一系列大型—特大型古滑坡,滑坡具有规模大、危害大、复活频繁等特点。位于甘肃岷县的阳坡村滑坡为一大型黄土-泥岩滑坡,该滑坡空间结构复杂、变形强烈。通过野外地质调查、遥感解译、无人机航测、钻探、数值模拟等研究方法,对阳坡村滑坡空间结构和变形特征进行分析,阐明了滑坡变形机制及影响因素。阳坡村滑坡的拉张裂缝等变形集中分布在3个强变形区(I_(1)、I_(2)、I_(3));钻探揭露阳坡村滑坡体发育两级滑带,其中钻孔ZK1揭露滑带位置为9.7~10.5 m和22.0~25.0 m,ZK3揭露滑带位置为10.0~12.3 m和36.0~37.0 m,滑坡体积约465×10^(4)m^(3);数值模拟结果表明,滑坡在一般工况下滑体位移变形量较小,稳定性较好;在暴雨工况下滑坡前缘强变形区产生局部变形,大范围变形可能牵引后部堆积体发生滑动;在地震工况下滑坡复活变形范围与大小较一般工况有明显增大,同时出现多个潜在滑动面,坡体产生多处变形。研究结果为阳坡村滑坡防治提供有效参考,对大型黄土-泥岩滑坡稳定性评价具有一定理论和实际意义。

降雨诱发古滑坡多期复活机制物理模拟试验研究

雅砻江上游某拟建水电站的库区巨型滑坡近年来变形显著,对水电站的施工、运营构成严重威胁。在现场地质调查和变形分析的基础上,配制不同相似材料,采用底摩擦试验对滑坡的变形机制以及破坏模式进行研究。底摩擦试验结果表明:滑坡B1区的后缘裂缝形成的时间较前缘裂缝的形成时间要早,裂缝规模也较大,这与现场调查、访问信息一致。B1区监测点表明,后缘变形程度较前缘更大,符合推移式的变形模式,但若B1区发生破坏失稳,可能造成后缘的A区局部渐进式的失稳破坏,整体上(A+B1区)可能演化为牵引式的变形破坏模式。底摩擦试验对周家滑坡的变形破坏模式研究成果可为工程治理决策提供一定的依据。

“起死”主题的二维性质——鲁迅《起死》新解

《起死》是《故事新编》的最后一篇,也是鲁迅的最后一篇小说,在鲁迅的作品中具有特殊的地位。鲁迅认为要排国民“不讲是非”的毒,首先要“起死”庄子,这成为鲁迅创作《起死》的动机。在文本层面,庄子又“起死”了汉子,并招来巡士,汉子、庄子、巡士三个角色架构起了中国千年的稳固社会格局。鲁迅最后一次采用小说的形式和象征主义的手法,赋予“起死”主题以二维性质,对中国社会的过去做了总结,对未来做了展望。

米·巴·希什金作品中的复活主题与神话元素

复活主题在希什金的作品中占据首要地位。以其为中心,可将作家的所有作品视为一个由主题网联系起来的超文本。通过对复活主题的起源、俄罗斯文学作品中的复活主题以及希什金作品中表现复活主题的主要手段“神话元素”进行分析,可以发现正是在各种表现复活主题的神话元素的意义交叉点上构建起了作者的整体诗学,其独特性体现在“通过语言和文字来复活”这一思想上。

讥讽丑恶的事物 挖掘心灵的秘密——托尔斯泰《复活》的艺术成就

托尔斯泰是19世纪俄国最杰出的批判现实主义作家,他的长篇小说《复活》是世界文学中不可多得的不朽文学名著,小说卓越的艺术成就达到了批判现实主义文学的新高峰。小说通过对比手法、讽刺手法、心理描写手法的成功运用,揭示事物的辩证关系,讥讽丑恶事物,挖掘人物心灵深处的秘密,既能做到不动声色的揭露又能收到入木三分的嘲讽效果。《复活》的艺术成就拓展了全新的文学表现领域和前进道路,对世界文学发展产生了巨大的影响。

某高炉年修后炉况快速恢复的操作实践

高炉休风复风后炉况的快速恢复,既直接影响高炉的产量和能耗,又对高炉炉况的持续稳定顺行具有重要意义。文章对武钢8号高炉年修后复风过程及炉况快速恢复进行了总结,通过科学制定休复风方案、细化操作和过程管理等措施,为炉况快速恢复奠定了基础。生产实验验证:炉况恢复时间大大缩短,并且开炉后取得了较好的冶炼效果。

古滑坡大型复活体分区发育特征分析及变形预测研究

为有效掌握古滑坡复活体发育特征及其变形发展规律,在古滑坡现场调查、无人机影像解译基础上,先开展复活体发育特征分析;其次,结合地表变形监测成果,通过FA-GRU-CT开展滑坡变形预测,并以预测结果开展其后续变化趋势等级划分。分析结果表明:古滑坡具显著的复活特征,按照地形、变形差异,主要复活体可分为6个区,且结合各区发育特征,其总体呈由前向后的牵引变形特征;同时,通过FA-GRU-CT的变形预测,得到预测结果的相对误差均值介于2.08%~2.17%,训练时间介于180.46~200.58 ms,具较高的预测精度和较快的收敛速度,并由预测结果计算得到滑坡变形趋势评价指标R的范围为0.789~1.081,变化趋势等级为Ⅱ级~Ⅳ级,说明此滑坡后续变形仍具较大的增加趋势,潜在失稳风险较大,建议尽快开展其防治处理。研究为此类古滑坡防治提供了一定的理论基础,具有推广应用价值。