mlsa-iai-msu-lab/ru_sci_bench_zho_cite_reranking huggingface dataset:
THE OVERLOOKED ECOSYSTEM DRIVING FORCE IN NON-EUTROPHICATED FRESHWATER SYSTEMS: DISSOLVED HUMIC SUBSTANCES-A SHORT REVIEW AND OUTLOOK

This review starts with the description of the quantitative significance of dissolved organic material in general and dissolved humic substances (HS) in particular in various ecosystems. Despite their high quantities, the knowledge about the role of HS is still very low and full of old, but still recycled paradigms. HS are thought to be inert or at least refractory and too large to be taken up by aquatic organisms. Instead, I present evidence that dissolved HS that mainly derives from the terrestrial environment, are taken up and directly and/or indirectly interfere with freshwater organisms and, thus, structure biocenoses.Relatively well known is in the meantime the fuelling function of allochthonous HS, which, upon irradiation, release fatty acids, which serve as substrates for microbial growth. This is an indirect effect of HS. Microbes, in turn, are food for mixotrophic algae and (heterotrophic) zooplankton. Thus, non-eutrophicated freshwaters are net-heterotrophic, meaning that respiration exceeds primary production. Furthermore, model calculations exemplify that only a very small portion of the terrestrial production is sufficient to cause net-heterotrophy in these freshwater bodies. But, recent papers show also that due to different stoichiometries the maximal plankton biomass production with algae or mixotrophs is higher than with bacteria.Very recently, several direct effects of HS have been elucidated. Among them are: induction of chaperons ( stress shock proteins), induction and modulation of biotransformation enzymes, modulation (mainly inhibition) of photosynthetic oxygen release of aquatic plants, production of an internal oxidative stress, modulation of the offspring numbers in the nematode Caenorhabditis elegans, feminization of fish and amphibs, interference within the thyroid system, and action as chemical attractant to C. elegans.We are still in the phase of identifying the various physiological, biochemical, and molecular-biological effects. Hence, the ecological and ecophysiological significance of these HS-mediated effects still remain somewhat obscure. Nevertheless, HS appear generally to have an impact on the individual as well as on the community and even ecosystem level comparable to that of, for instance, nutrients.
脂联素及其在非酒精性脂肪性肝病中的作用研究进展

非酒精性脂肪性肝病(NAFLD)已成为危害人类健康的主要消化道疾病之一,及早发现和治疗NAFLD已引起广泛的关注.对于NAFLD的发病机制至今仍存在争议,但与代谢综合征(中心性肥胖、高甘油三酯血症、低高密度脂蛋白胆固醇血症、口服葡萄糖耐量试验异常和高血压等)具有一定的相关性,而脂联素在代谢综合征的发生、发展过程中起着重要的作用,增加血浆中脂联素及其衍生物可以减轻肝组织的损伤和脂肪变性,从本质上为遏制NAFLD的发生、发展奠定了坚实的理论基础.
丙型肝炎个体化治疗及转归优化

目前,聚乙二醇化干扰素(peginterferon,Peg-IFN)加利巴韦林(ribavirin,RBV)联合治疗是丙型肝炎病毒(HCV)感染的标准疗法,患者总的病毒根除率达50%以上,但是,HCV基因Ⅰ型感染患者中,尤其是基线高水平病毒血症者,持续性病毒应答率(sustained virologic response,SVR)仍较低,此外,治疗相关的不良反应也限制了某些患者的治疗.
无自主呼吸全身麻醉气管支气管异物取出术

近年来全身麻醉下气管支气管异物取出术已经被广泛采用,但一般均保留自主呼吸.我科于2002年起采用肌肉松驰、无自主呼吸全身麻醉方法进行气管支气管异物取出术,取得满意的效果,报告如下.
87例孕妇狂犬病暴露后接种狂犬疫苗对孕妇影响的研究

为探讨孕妇在狂犬病毒暴露后接种狂犬疫苗的免疫效果及对胎儿的影响,对2000-2005年前来咸宁市疾病预防控制中心免疫接种门诊求治的87例被疯动物和疑似疯动物致伤的孕妇进行追踪观察,暴露分级按WHO疯动物致伤程度分级标准进行[1].
肝素钠软膏结合压力疗法治疗深Ⅱ度烧伤后瘢痕增生87例

传统的压力疗法预防瘢痕增生的效果已得到肯定,肝素钠软膏作为外用药预防瘢痕增生也有相关报道.近年来笔者对深Ⅱ度烧伤愈合创面早期应用肝素钠软膏结合压力疗法以预防瘢痕增生,取得了较满意的疗效.
口腔鳞癌中活化细胞外信号调节激酶1/2和cyclin D1的表达

ras/raf/丝裂原活化蛋白激酶(mitogen-activated protein kinase,MAPK)级联是细胞增殖信号的关键.MAPK信号通路位于ras基因下游,通过激活cyclin D1基因刺激细胞增殖,从而引起恶性肿瘤发生.细胞外信号调节激酶(extracellular signal-regulated kinase,ERK)是MAPK家族的成员之一, 包括ERK1和ERK2.ERK1/2被活化及cyclin D1过度表达与肿瘤的发生有关.我们应用免疫组化方法,检测了活化ERK1/2和cyclin D1蛋白在口腔鳞癌及相应癌旁正常组织中的表达,以探讨其与口腔鳞癌临床生物学特性和细胞增殖的关系, 并同时检测了作为细胞增殖因子的Ki-67.
用于地震数值模拟研究的数据库及应用平台

数值模拟已经渗透到地震学研究的各个重大领域，随着信息时代数字技术的高速发展，充分利用数字信息资源，开展多学科的综合研究已成为地震学研究发展的趋势。利用数值模拟的手段，将多学科的观测资料、实验结果和理论分析有机地结合起来，将会极大地开拓解决重大地震学问题的能力，必将推动对危害人类的强地震的预测预报从经验性向物理的、数字的预报转变。该平台提供面波频散信息，中国及邻区三维速度模型，中国大陆震源机制，断层构造，地震波形，地震目录，地震台站，以及仪器响应信息等丰富的地震学基础数据和研究成果，可以利用这些信息构建比较合理的地球模型和尽可能多的约束条件，并进行地壳形变和地震过程的数值模拟；可以在该应用平台开展地球介质各向异性分析，面波层析成像，面波偏振分析，面波时频分析，以及射线追踪等与地球内部结构有关的研究，同时，这也是一个交流平台，研究人员可以利用该平台发布自己的研究成果与同行交流.
血压昼夜节律与血管内皮功能关系探讨

随着对原发性高血压（EH）研究的不断深入．血压昼夜节律的变化越来越受到重视．动态血压监测可了解血压昼夜变化规律．故更能反映高血压靶器官损害的程度及预测心血管事件的发生。内皮功能失调（或受损）作为心血管损伤的早期标志受到广泛的关注，新近的研究表明．较之杓型高血压患者．非杓型高血压患者一氧化碳（NO）生成减少而导致血管内皮功能受损．但其机制及因果关系尚未完全明了。
早发型重度子痫前期临床分析

妊娠期高血压疾病是严重影响母婴健康．导致孕产妇和围产儿死亡的重要原因之一，尤其是早发型重度子痫前期．发病早，病情重，对母婴危害极大，而国内外相关报道甚少。笔者对我院收治的重度子痫前期患者临床表现、围产期管理及妊娠结局进行分析，以期发现早发型重度子痫前期的临床特点，改善围产结局。
组织环境与组织战略关系的文献综述及最新研究动态

（一）引言组织环境与组织战略之间的关系如何？战略是完全受制于环境还是在某种程度上能影响环境？这些问题始终占据着组织和管理研究的焦点位置，由此提出的环境一战略一绩效研究范式也成为战略管理领域最为经典的研究框架。围绕着环境与战略对绩效的影响程度究竟是环境的选择性为主导还是战略的主动适应性为主导的争议诞生了众多的管理理论流派，根据对这一问题的不同看法，我们可以将战略管理学派分成3组：第一组强调环境对战略的决定作用；第二组看重战略对环境的影响作用；第三组可以认为是前面观点的综合，它代表了目前最新的研究方向，即认为环境与战略之间不是单向地决定关系，而是存在双向复杂的协同演进关系（Levin ＆ Volberda，1999）。本文将依据此分类来进行文献回顾，并重点介绍有关环境与战略协同演进的前沿研究方法及成果。
农村税费改革对中西部乡镇财力影响的实证研究——基于4省8县抽样调查数据的分析

农村税费改革试点工作开展以后，农民负担得到减轻，干群关系得到改善；同时，此项改革也对乡镇财政状况产生了重要影响。本文使用一组抽样调查数据，考察了农村税费改革初期中西部地区乡镇按照不同口径测算的财力变化，经过对比发现，多数乡镇具有共同的变化趋势，即预算内收入和可支配财力增加、总财力下降。基于这个判断，本文以税改前后乡镇财政收入结构变化为切入点，深入探讨了农村税费改革对乡镇财力的影响。
城市贫困家庭青年就业与收入的实证研究——基于西部三个城市的微观数据

本文基于中国3个城市，3394个住户的微观数据，测算了低保家庭20～35岁青年的就业机会和收入的差距。本文主要的发现包括：(1)在小时工资的差异中，贫困家庭的青年的预期小时工资仅仅相当于非贫困家庭同龄人的45％，分解的结果表明，家庭背景造成了差距的58％；(2)在综合考虑了就业机会不同的前提下，利用Two-Part模型计算发现低保家庭青年的预计月收入平均只相当于非低保家庭同龄人的1/4，一个低保家庭的终身收入在现有的条件下，平均要低于非低保家庭20万～30万元；(3)中国城市贫困存在代季传递的情况，大约仅有35％的贫困家庭后代能够跳出贫困陷阱。
收入不平等孰甚：地区间抑或城乡间

本文认为泰尔指数分解先后次序会影响我们对收入不平等问题的判断，先按城乡分解后按地区分解倾向于夸大城乡间收入不平等，先按地区分解后按城乡分解则倾向于夸大地区间收入不平等。为此，本文同时采用两种分解过程，并提取了纯地区间收入不平等和纯城乡间收入不平等，从静态角度分析孰轻孰重问题。然后沿用并扩展了Mookherjee和Shorrocks给出的研究方法从比较静态角度对收入不平等的变动进行分解，考察收入不平等增量中地区间收入不平等变动与城乡间收入不平等变动及人口流动等因素的贡献。研究结论表明：城乡间收入不平等较地区间收入不平等更甚，它与总收入不平等变动具有很强的同步性，在总收入不平等变动的4个阶段中，城乡间收入不平等变动在总收入不平等变动中始终处于主导地位；地区间收入不平等弱于城乡间收入不平等，但它基本上呈单调递增的特征，累积效应明显：另外，目前城乡间人口流动倾向于推动收入不平等的上升，而地区间人口流动有助于收入不平等的缩小。
垃圾发电厂采用的自动化技术

介绍了垃圾发电厂的电气自动化技术和烟气自动检测技术.讨论了系统的结构和功能、厂站层和间隔层的配置、垃圾焚烧炉烟气连续在线监测系统的作用和功能以及核心部件的原理和关键技术,表明自动化技术非常适合应用于这类发电厂工程.最后分析了垃圾发电这一新能源的效益和存在的问题.
中阻抗母线差动保护不正确动作事故分析

华中电网连续发生2起RADSS/S型中阻抗母线差动保护不正确动作事故,有误动、也有拒动.一起事故是,短接了备用间隔辅助变流器一次侧,形成短接变流器与差动回路分流,造成RADSS/S型母线保护拒动;另一起事故是,电流切换接点击穿,双母线的2套RADSS/S型母线保护直接产生了电的联系,破坏了差动保护的电流关系.误动保护引入了差动电流,拒动保护吸出的差动电流反而成为制动电流.2起事故一个共同点是违背了RADSS/S型母线保护的工作原理,继电保护专业人员缺乏对保护原理的掌握、制造厂家没有指导用户正确使用保护、运行维护人员缺乏定期检验和维护.按照十八项反措,对重要220 kV变电站配置双套母线保护,逐步更换有触点切换的模拟式母线保护为无触点切换的微机保护.
小型耕整机阻尼减振手把的虚拟仿真试验

提出了一种小型耕整机的阻尼减振手把,建立了虚拟样机并采用仿真正交试验对其参数进行了优化.通过建立2种作业条件下的虚拟样机及仿真,研究了阻尼减振手把的减振效果,给出了阻尼减振手把粘性流体的仿真试验方法.研究结果表明,阻尼减振手把能有效降低手把的振动量,加速度降低49%～81%.
开拓领域,推动业务,努力创新——纪念中国气象科学研究院成立50周年

中国气象科学研究院是中国气象局直属科研单位,是中国大气科学综合研究基地,其前身是成立于1956年的中央气象科学研究所.中国气象科学研究院成立50年来,始终面向中国气象事业的发展和国际大气科学前沿,在大气探测、中尺度气象学、气候学、极地和高原气象学、数值天气预报、农业气象学、大气化学与大气环境、云雾降水物理与人工影响天气、大气雷电等领域开展了广泛而深入的研究,并开展了东亚季风、台风、暴雨、高原气象、极地气象等方面的综合科学试验,取得了丰硕的研究成果,为中国气象科研与业务事业发展做出了重要贡献.
女性失眠患者临床特征的调查研究

失眠指入睡困难,夜间容易觉醒,睡眠时间短,甚至彻夜难眠,并伴有一系列精神神经症状,是临床常见病、多发病.时间持续1周以上为急性特发性失眠;持续1周以上,1个月以内为亚急性特发性失眠:持续4周以上为慢性失眠.排除焦虑症、抑郁症、疑病症等神经症所致的失眠和其他内科精神科疾病所致的失眠.而女性失眠有其特殊性,为此,本文对女性失眠患者的临床特征调查研究,从中获得了一些有益的资料.
寿宁益肾胶囊对老年肾功能减退与血液流变学的影响

老龄肾功能减退是人体衰老的内在变化,主要是肾小球滤过率和肾小管浓缩与重吸收功能下降,其特异性临床症状不多,容易被忽视.1977年英国Brocklehurst对100例死亡的老年人做了尸检,结果发现其肾功能正常者仅有3例[1].可见,肾脏的衰老同其他系统的改变一样,也是普遍存在甚至是非常显著的.为了探讨防治老年肾功能减退方法,我们将中药寿宁益肾胶囊应用于老年肾功能减退并进行了观察.
农户农业生产性投资行为的影响因素分析--以南京市五县区为例的实证研究

农业投资已经成为决定21世纪我国农业发展水平的关键因素.本文研究了作为农业微观经济主体的农户进行农业生产性投资的情况,以南京市为例进行了实证分析.分别运用Logit模型和Tobit模型对影响农户是否进行农业生产性投资的因素和影响农户投资规模的因素进行探讨.研究结果表明,农户的农业生产性投资受到非农就业程度、土地规模、信贷能力、教育培训支出、生产资料购入价格、公共投资设施等因素的显著影响.最后得出结论并提出相应政策建议.
幽门螺杆菌与胆囊壁胆囊收缩素受体mRNA表达在胆囊结石形成中的作用

胆囊结石的形成通常认为与细菌感染无关,直到Swidsinski等[1]采用分子生物学方法分离到人胆囊结石中细菌DNA,才使人们重新考虑细菌在胆囊结石发病机制中的作用.有研究报道在胆囊结石患者的结石、胆汁和胆囊壁中检测出幽门螺杆菌(Hp)DNA.我们用聚合酶链反应(PCR)方法,检测35例胆囊结石患者和25例胆囊息肉样病变患者胆汁中的Hp细胞毒素相关基因抗原(cagA);采用逆转录-聚合酶链反应(RT-PCR)方法,对这两组患者的胆囊壁胆囊收缩素-A(CCK-A)进行检测,研究胆囊Hp感染与胆囊壁CCK-A受体表达的关系,及其在胆囊结石形成过程中的作用.
"惠满丰"腐殖酸液肥在棉花上的示范试验

进行了"惠满丰"腐殖酸液肥在棉花上的示范试验,结果表明:其对棉花的生长发育有较好的促进作用,能加快生长进程,提早2～3 d开花吐絮,能提高产量,可增产7.69%,同时可以改善棉花的纤维品质.
洞庭湖区低温、阴雨对直播早稻育秧的气象风险分析与决策

通过对历年早春低温、阴雨气候资料的分析,确定影响直播早稻烂种烂秧的气候风险率,并确定播种育秧期间的栽培技术要点是:播种期间发展"趋利避害"型气象服务技术,育秧期间加强"抗灾减灾"技术服务及设施整治.
土壤酶功能的研究进展

土壤酶在土壤生态系统中具有重要的地位,目前对土壤酶功能的研究已日益深入.各种研究显示:土壤酶在评价土壤肥力和土地利用、治理土壤污染、培肥土壤和防治植物病虫害等方面具有重要的作用.
Escape probability based routing for ad hoc networks

Routes in an ad hoc network may fail frequently because of node mobility. Stability therefore can be an important element in the design of routing protocols. The node escape probability is introduced to estimate the lifetime and stability of link between neighboring nodes and the escape probability based routing (EPBR) scheme to discover stable routes is proposed. Simulation results show that the EPBR can discover stable routes to reduce the number of route rediscovery, and is applicable for the situation that has highly dynamic network topology with broad area of communication.
Decentralized robust stabilization of discrete-time fuzzy large-scale systems with parametric uncertainties: a LMI method

Decentralized robust stabilization problem of discrete-time fuzzy large-scale systems with parametric uncertainties is considered. This uncertain fuzzy large-scale system consists of N interconnected T-S fuzzy subsystems, and the parametric uncertainties are unknown but norm-bounded. Based on Lyapunov stability theory and decentralized control theory of large-scale system, the design schema of decentralized parallel distributed compensation (DPDC) fuzzy controllers to ensure the asymptotic stability of the whole fuzzy large-scale system is proposed. The existence conditions for these controllers take the forms of LMIs. Finally a numerical simulation example is given to show the utility of the method proposed.
Output feedback adaptive control of multivariable nonlinear systems using Nussbaum gain method

A new output feedback adaptive control scheme for multi-input and multi-output nonlinear systems with parametric uncertainty is presented based on the Nussbaum gain method and the backstepping approach. The high frequency gain matrix of the linear part of the system is not necessarily positive definite, but can be transformed into a lower or upper triangular matrix whose signs of diagonal elements are unknown. The new required condition for the high frequency gain matrix can be easily checked for certain plants so that the proposed method is widely applicable. The global stability of the closed loop systems is guaranteed through this control scheme, at the same time the tracking error converges to zero.
Homotopic Mapping Solving Method for Perturbed Mechanism of Western Boundary Undercurrents in Equator Pacific

The perturbed boundary undercurrent is an exceptional event in the tropical atmosphere and ocean. It is a complicated nonlinear system. Its appearance badly affects not only natural conditions such as climate and environment,but also global economic development and human living, and brings about many calamities. Thus there is very attractive study on its rules in the international academic circles. Many scholars made more studies on its local and whole behaviors using different methods, such as self-anamnestic principle, Fokker-Plank Equation method, higher order singular pedigree and predictable study, rapid change on boundary, indeterminate adaptive control, multi-cogradient method and so on. Nonlinear perturbed theory and approximate method are very attractive studies in the international academic circles. Many scholars considered a class of nonlinear problems for the ordinary differential equation, the reaction diffusion equations, the boundary value of elliptic equation, the initial boundary value of hyperbolic equation, the shock layer solution of nonlinear equation and so on. In this paper, a class of perturbed mechanism for the western boundary undercurrents in the equator Pacific is considered. Under suitable conditions, using a homotopic mapping theory and method, we obtain a simple and rapid arbitrary order approximate solution for the corresponding nonlinear system. For example, a special case shows that using the homotopic mapping method, there is a high accuracy for the computed value.It is also provided from the results that the solution for homotopic mapping solving method can be used for analyzing operator for perturbed mechanism of western boundary undercurrents in the equator Pacific.
Development and Conservation of Glacier Tourist Resources——A Case Study of Bogda Glacier Park

Glacier is one kind of the most beautiful geological sightseeing in the world as well as a special kind of tourism resources. The characters of glacier tourism include scarcity, frangibility, localization of tourist activity, scientific connotation, and integrated function and value. The paper summarizes the latest researches in developing glacier tourism resources. Regarding the Bogda Glacier Park as an example, the authors analyze the characteristics of glacier tourism resources in detail and the conditions and potential threats of glacier tourism development. Suggestions on glacier tourism development and protection are given as follows: 1) to plan function subarea scientifically and reasonably; 2) to combine tourism, scientific research with ecological education; 3) to take countermeasures of environmental protection; 4) to integrate tourism resources and strengthening regional cooperation. Finally, emphases are put forward on resources conformity along the tourism line and cooperation of tourism management. The paper aims to seek after the coordination path in exploitation and protection of glacier tourism resources to guide the exploitation of other glacier tourism destinations.
Shrinking and Drying up of Baiyangdian Lake Wetland: A Natural or Human Cause?

The shrinking and drying up of wetlands in arid and semiarid areas of China have been widely observed in the recent years, but there has been no consensus on whether the aggravation is caused by human activities or by global climate warming. For a better understanding of the cause, this study investigates the dynamic changes of Baiyangdian Lake wetland over the last 40 years. It is shown that since the 1980s, Baiyangdian Lake has suffered from an insufficient water input and shrunk considerably. By using SPSS11.0, this study undertakes a detailed analysis on the significance of the effects of the possible driving factors for the degradation. It is identified that the North China Plain has been warming up significantly in recent years, which causes a significant reduction in the precipitation and inflow to the lake. Although human disturbances such as the irrigation and storage of water in reservoirs do not play a decisive role, they accelerate the degradation and their effects should be minimized.
Chinese Geographical Science

Land, as a key factor of production, is an appropriate indicator of national and regional economic structure transformation. Land use in the Changjiang (Yangtze) River Basin (CRB) since the 1950s has experienced these changes.Industrialization has been the most powerful force of the change in the regional development of the CRB. Virtually all regional resources were put into this effort to modernize the industrial production and urban construction systems of the CRB whose industrialization and urbanization has been a success story, with impressive structural change in both production and land use. These changes are evident in modern urban areas, but even more in traditionally rural areas. The regression analysis of regional development in the CRB over an extended period shows that the dominant factor in regional land use change is widespread industrialization in rural areas rather than the expansion of urban area. Thus, urbanization has had a limited influence on land use change in the CRB. A major task in realizing more sustainable land use in the future development of CRB is to relocate industrial activities from rural to urban areas.
Characteristics of Channeling Flow in Cultivated Horizon of Saline Rice Soil

By applying bromide ion as tracer, the channeling flow has been quantitatively described in saline rice soil and alkaline soil of Da'an City, Jilin Province of China. Breakthrough curves of bromide ion in the saline rice soils after 1-year cultivation and 5-year cultivation and alkaline soil have been attained. Results show that the rice cultivation practice can improve the alkaline soil structure, however, it can accelerate the development of channeling flow pathway.Therefore, the channeling flow pathway has been developed widely in saline rice soil, but rarely in the alkaline soil.Three models of convection-dispersion equation (CDE), transfer functional model (TFM) and Back-Progation Network (BP Network) were used to simulate the transportation process of bromide ion. The peaks of probability density function of saline rice soil are higher with left skewed feature compared with that of the alkaline soil. It shows that the TFM and CDE can simulate the transportation process of the bromide ion in saline rice soil after 5-year cultivation, however, some deviation exists when it was used to simulate transportation process of bromide ion in saline rice soil after 1-year cultivation and alkaline soil; BP network can effectively simulate transportation process of bromide ion in both saline rice soil and alkaline soil.
Design and implementation of high-speed real-time data acquisition system based on FPGA

The electromagnetic radiation will result in information leakage being recovered when computers work. This article presents a high-speed real-time data acquisition system based on peripheral component interconnect (PCI) bus and field programmable gate array (FPGA) for sampling electromagnetic radiation caused by video signal. The hardware design and controlling flow of each module are introduced in detail. The sampling rate can reach 64 Msps and system transfers speed can be up to 128 Mb/s by using time interleaving, which increases the overall sampling speed of a system by operating two data converters in parallel.
NEAR-FIELD ACOUSTIC HOLOGRAPHY FOR SEMI-FREE ACOUSTIC FIELD BASED ON WAVE SUPERPOSITION APPROACH

In the semi-free acoustic field, the actual acoustic pressure at any point is composed of two parts: The direct acoustic pressure and the reflected acoustic pressure. The general acoustic holographic theories and algorithms request that there is only the direct acoustic pressure contained in the pressure at any point on the hologram surface, consequently, they cannot be used to reconstruct acoustic source and predict acoustic field directly. To take the reflected pressure into consideration, near-field acoustic holography for semi-free acoustic field based on wave superposition approach is proposed to realize the holographic reconstruction and prediction of the semi-free acoustic field, and the wave superposition approach is adopted as a holographic transform algorithm. The proposed theory and algorithm are realized and verified with a numerical example,and the drawbacks of the general theories and algorithms in the holographic reconstruction and prediction of the semi-free acoustic field are also demonstrated by this numerical example.
IMPROVED QUANTITATIVE FEEDBACK THEORY TECHNIQUE AND APPLICATION TO THREE-AXIS HYDRAULIC SIMULATOR

In order to meet tracking performance index of three-axis hydraulic simulator, based on classical quantitative feedback theory (QFT), an improved QFT technique is used to synthesize controller of low gain and bandwidth. By choosing a special nominal plant, the improved method assigns relative magnitude and phase tracking error between system uncertainty and nominal control plant.Relative tracking error induced by system uncertainty is transformed into sensitivity problem and relative tracking error induced by nominal plant forms into a region on Nichols chart. The two constraints further form into a combined bound which is fit for magnitude and phase loop shaping. Because of leaving out pre-filter of classical QFT controller structure, tracking performance is enhanced greatly. Furthermore, a cascaded two-loop control strategy is proposed to heighten control effect. The improved technique's efficacy is validated by simulation and experiment results.
Immediate-early Inducible Function in Upstream Region of junB Gene

Objective To analyze the upstream region of radiation-induced junB gene. Methods Four plasmids containing 250 bp, 590 bp, 900 bp and 1650 bp, and CAT reporter gene were constructed separately and introduced to L8704 cells. The cells were irradiated with 2 Gy X-rays and incubated at different intervals. Total RNA was extracted from the cells and fluctuation of the CAT mRNA level was assessed by the RNA ratio of CAT/β-actin measured by quantitative Northern blot hybridization. Results CAT mRNA expression containing 900 bp and 1560 bpjunB promoter remarkably and rapidly increased, and reached its peak 30min after 2 Gy X-my irradiation. Conclusions 590-900 bp fragments located in the upstream region of junB gene play an important role in the early process of cells against radiation.
EXPERIMENTAL INVESTIGATION OF TIP CLEARANCE FLOW FOR AN AXIAL FLOW FAN ROTOR

The flow field in the tip region of an axial ventilation fan is investigated with a particle image velocimeter (PIV) system at the design condition. Flow fields with three different tip clearances are surveyed on three different circumferential planes, respectively. The phase-locked average method is used to investigate the generation and the development of a tip leakage vortex. The result from PIV system is compared with that from a particle dynamics anemometer(PDA) system. Both data are in good agreement and the structure of the tip leakage vortex for the rotor is illustrated. The characteristic of a leakage vortex is described in both velocity vectors and vortical contours. The unsteadiness of the leakage vortex and the position of the vortex are surveyed in detail, which interprets the discrepancy between the numerical simulation and PDA experimental results to a certain extent. The center loci of tip leakage vortex at different times and the mean center loci of the leakage vortex are displayed particularly. Finally, the trajectories of the tip leakage vortex by the experimental measurement are compared with predictions from the existing models for high speed and high-pressure compressors and turbines when appropriately interpreted. A good agreement is obtained.
Effects of Terephthalic Acid on Rat Lipid Metabolism

Objective To study the effect of terephthalic acid （TPA） on lipid metabolism in Sprague-Dawley （SD） rats. Methods Five groups of SD rats that ingested 0%, 0.04%, 0.2%, 1%, and 5% TPA, respectively, were included in a 90-day subchronic feeding study. Effects of TPA on levels of serum protein, total cholesterol （TC）, triglycerides （TG）, high-density lipoprotein cholesterol （HDL）, total antioxidative capability （T-AOC）, superoxide dismutase （SOD） and malondialdehyde （MDA） were observed. Urine samples were collected and analyzed for concentration of ion. Results TPA decreased the level of serum T-AOC in a dose dependent manner. The contents of serum and bladder MDA significantly decreased in 1% and 5% TPA ingestion groups. Serum CuZn superoxide dismutase （CuZnSOD） lowered in groups of 0.2%, 1%, and 5% TPA. TPA subchronic feeding had no significant influences on serum TC, LDL or HDL, but increased serum TG, TP and ALB after administration of 0.04% and/or 0.2% TPA. Concentrations of urinary Ca^2＋, Mg^2＋, Na^＋, and K^＋ were elevated in 1% and 5% TPA groups. Conclusion Antioxidative potential decreased after TPA exposure. MDAincrease in serum and bladder tissues was one of the most important reactions in rats which could protect themselves against TPA impairment. The decrease of serum CuZnSOD was related to the excretion of Zn^2＋.
淮北地区小麦生长期灌溉对产量和水肥利用效率的影响

地处北亚热带向暖温带过渡季风区域的淮北地区,由于降水时空分布不均,土壤水分物理性质不良,造成旱涝频发,一直是该区农业生产的主要障碍因素.长期以来,如何合理调控水肥、提高施肥效率、培育土壤质量、实现高产稳产,一直是该区农业生产实践中面临的重要问题.本文对淮北地区主要旱粮作物小麦生育期间的水肥效应进行了系统研究,在此基础上对小麦生育期干旱缓解、灌溉与施肥效率提高的技术措施进行了初步阐释,为本区小麦高产稳产的水肥管理实践提供科学依据.
紫云英-小麦混作体系中氮素转移对小麦生长的促进作用

关于根瘤菌与非豆科植物关系的研究近年来已取得了一定的进展.已有的研究表明,在自然条件下,根瘤菌能够在水稻及一些非豆科植物的根圈定殖及固氮,具有植物根圈促生(PGPR)作用,能促进植物根系有效地吸收土壤中的水分和养分,从而促进植物的生长发育,同时对植物体其他生命活动进行调控.还可以提高植物的抗逆性,减轻或抑制有害的根际微生物,从而间接促进植物生长.
迟熟杂交早稻新组合金优郴97

金优郴97是湖南郴州市农科所用自育恢复系郴R97-4 与金23A配组育成的迟熟杂交早稻新组合,表现产量较高、稻米加工品质和蒸煮品质较好,2 006年2月通过湖南省农作物品种审定委员会审定.
优质杂交中稻新组合渝优35

渝优35是重庆市作物研究所用自育的恢复系1351R与不育系805A配组育成的中籼中迟熟杂交水稻新组合.该组合株叶型好,品质较优,产量较高 ,生育期与汕优63相当,适应性广,于2006年6月通过重庆市农作物品种审定.