对大熊猫数量调查方法中咬节区分机制的准确性评价

在目前所广泛应用的大熊猫的数量调查方法中,咬节区分是一种重要的区分机制。本文收集了王朗国家级自然保护区内的同一个熊猫个体的粪便咬节数据,并结合已经发表的同个体粪便咬节数据,对应用咬节区分机制时正确判断的比率进行了评估。通过对17组124团粪便的522个同组内粪便咬节平均值差值的分析,发现在王朗应用2mm的判断阈值时,正确判断的比率为92.9%;卧龙野生种群的正确判断比率为71.2%(1组12团66个差值);圈养种群的正确判断比率为77.6%(7组139团1555个差值),显示咬节区分机制中的2mm阈值具有相当高的准确性。同一团粪便中咬节取样量不足会增加错判的比率,以100咬节测量为对照,30咬节取样会增加3.7%的错判比率,34咬节的测量会增加2.6%的错判比率。

构建节约集约用地激励与约束机制

我国土地利用方式粗放低效,供需刚性矛盾突出,节约集约利用土地已经成为关乎社会发展的重要问题。从我国土地资源国情、加快转变经济发展方式要求等方面来看,加快提升土地节约集约利用水平必要且紧迫。节约集约用地激励与约束机制不健全,是土地利用粗放低效的重要原因。因此要综合运用行政、法律、经济、技术等手段,激励和约束并举,构建战略导向、规划管控、利益调节、考评奖惩、共同责任和技术保障等多元倒逼机制,以推进经济结构调整和发展方式转变。

基于震源机制解分析邢台地震的发震构造

活动断层几何形状的确定为评估一个地区的地震危险性提供重要的理论依据,邢台老震区内构造背景复杂,前人对邢台地震的发震构造展开大量研究,取得丰富成果。通过震源机制节面聚类得到邢台地震发震断层的走向、倾角及其标准差,综合前人研究结果求取发震断层面的平均解;结合区域地壳应力张量,估计该断层的滑动方向及其误差,分析该区域的地震活动危险性。结果表明:邢台地震发震断层的走向为32.45°,倾角为79.44°,滑动角-153.96°,标准差为4.55°。该断层为走向NNE、倾向NWW的高倾角走滑型断层,而非正断性质的新河断裂。区域地壳应力场在断层面上产生的相对剪应力为0.83,相对正应力为0.59。该断层不是最大剪应力的断层面形状,但剪应力强度仍较大,表明该断层在地震能量积累和释放过程中仍起到必不可少的作用。

造血调节的某些新概念探讨

科学的进步受两大因素的推动:技术的革新和概念的更新。前者一直受到学术界的重视,概念的更新则较困难,往往几经周折。自古以来科学的发展就受概念的制约。古代,人们认为地方天圆,不敢向一个方向航行,深怕掉入无底的深渊。只有在认为地是球形的概念指导下,才敢于向一个方向航行。

利用静态库仑应力触发准则确定地震断层面

震源机制解存在2个节面,通过地震波记录难以确定哪个节面为地震断层面。地震静态应力触发的相关研究表明,主震对后续余震有较为明显的触发作用。余震的空间分布也可以为确定震源机制节面中的断层面提供有效信息。以汶川、玉树地震为例,按照余震最大应力触发准则来确定震源机制2节面中的断层面。研究发现,采用上述准则确定的断层面与余震分布、地表观测一致。为快速判定地震断层面提供了一种途径。

溧河铺乡畜牧业步入快车道

新野县傈河铺乡近年来，该乡紧紧引门控设畜牧强乡工作目标，以产业化经营为｝攻方问．使畜牧支柱不断膨胀壮大。政策驱动＿该一律有畜竹方转整个ll＊1’扶持畜牧‘“三专”发展。今年上十年．L从婊金中发放无息代款137万元。龙头带动。目前，在三坡良种猪场和万R蛋鸡场等...

试述世界经济发展的总体趋势

经济集团化,是指两个或两个以上的国家,通过建立某种程度经济联合和共同调节机制,形成区域性经济共同体,为各成员国经济创造一个大市场,从而促进区域性专业化分工,发挥规模经济效益。

Adaptive Immune Evolutionary Algorithms Based on Immune Network Regulatory Mechanism

Based on immune network regulatory mechanism, a new adaptive immune evolutionary algorithm (AIEA) is proposed to improve the performance of genetic algorithms (GA) in this paper. AIEA adopts novel selection operation according to the stimulation level of each antibody. A memory base for good antibodies is devised simultaneously to raise the convergent rapidity of the algorithm and adaptive adjusting strategy of antibody population is used for preventing the loss of the population adversity. The experiments show AIEA has better convergence performance than standard genetic algorithm and is capable of maintaining the adversity of the population and solving function optimization problems in an efficient and reliable way.

Iodothyronine deiodinase gene analysis of the Pacific oyster Crassostrea gigas reveals possible conservation of thyroid hormone feedback regulation mechanism in mollusks

Iodothyronine deiodinase catalyzes the initiation and termination of thyroid hormones(THs) effects, and plays a central role in the regulation of thyroid hormone level in vertebrates. In non-chordate invertebrates, only one deiodinase has been identified in the scallop C hlamys farreri. Here, two deiodinases were cloned in the Pacific oyster C rassostrea gigas( Cg Dx and C g Dy). The characteristic in-frame TGA codons and selenocysteine insertion sequence elements in the oyster deiodinase c DNAs supported the activity of them. Furthermore, seven orthologs of deiodinases were found by a tblastn search in the mollusk Lottia gigantea and the annelid C apitella teleta. A phylogenetic analysis revealed that the deiodinase gene originated from an common ancestor and a clade-specific gene duplication occurred independently during the differentiation of the mollusk, annelid, and vertebrate lineages. The distinct spatiotemporal expression patterns implied functional divergence of the two deiodinases. The expression of C g Dx and Cg Dy was influenced by L-thyroxine T4, and putative thyroid hormone responsive elements were found in their promoters, which suggested that the oyster deiodinases were feedback regulated by TH. Epinephrine stimulated the expression level of C g Dx and Cg Dy, suggesting an interaction effect between different hormones. This study provides the first evidence for the existence of a conserved TH feedback regulation mechanism in mollusks, providing insights into TH evolution.

Integrated design of brushless motor drive and control system for robot joints

To meet the requirements of high performance, low cost, and easy operation of the robot, a brushless motor drive and control system for the robot joint is designed, including CAN bus, WPF upper host computer development, and magnetic encoders, and other sensors, in which the STM32 F103 chip is used as the main control chip, and the DRV8323 is a brushless motor drive chip. The principle of field-oriented control(FOC) brushless motor drive is elaborated.Meanwhile, the drive and control system design is completed from both hardware and software aspects. Finally, the PID algorithm is used for the closed-loop speed test of the robot joint. The experimental result shows that the designed robot joints and control system run smoothly and reliably, have the characteristics of modularization and miniaturization, and are suitable for the control of micro-service robots and manipulators.

Proline-rich tyrosine kinase 2 and its inhibitor PRNK

Proline-rich tyrosine kinase 2 (Pyk2) is a nonreceptor protein tyrosine kinase,which is also known as Ca2 +-dependent tyrosine kinase or related adhesion focal tyrosine kinase.Pyk2 activation exerts a critical regulatory mechanism for various physiological processes including cytoskeleton function,regulation of cell growth and death,modulation of ion channels and multiple signaling events.However,mechanisms underlying the functional diversity of Pyk2 are not clear.A Pyk2 isoform that encodes only part of the C-terminal domain of Pyk2,named as PRNK (Pyk2-related non-kinase),acts as a dominant-negative inhibitor of Pyk2-dependent signaling by displacing Pyk2 from focal adhesions.Research on functional PRNK probably provides new potential inhibitory tool targeting Pyk2 and makes it possible to explore more of Pyk2 pathological mechanism.PRNK is a promising candidate targeting Pyk2 modulation.This review focuses on the functional investigation of Pyk2 and its structure and localization,including recent research with inhibitory strategies targeting Pyk2 by the method of PRNK.

Selection of Measured Signals in the Navigation Measuring Complex

To increase accuracy of navigation parameters,a perspective measuring complex with intellectual components is developed.Conception of synthesis optimal structure of the measuring complex is realized basing on a selective method using principles of the functional systems.Selection of measured information is finished by original numeric criterion of observation level of state vector components.Prediction is realized by algorithm of self-organization that makes synthesis of the optimal complication.Therefore mechanism of self-regulation is realized and accuracy of the selective navigation complex is increased.

A New Network Coding Mechanism Balancing Coding Opportunities, Energy and QoS in WSNs

A new Network Coding mechanism in WSNs(Wireless Sensor Networks), which is named COEQ and aims at balancing coding opportunities, energy and QoS, is proposed and analyzed. Implemented on the basis of traditional AODV protocol, COEQ evaluates several metrics of paths comprehensively with TOPSIS method including minimum remaining energy, coding opportunities, QoS and so on, so as to select the optimal transmitting route. Experiments on NS[2] show that COEQ can improve throughput and save energy when the transmitting rate is low.

Employer Branding Management As A Strategic and Organizational Control Tool

The issue of employer branding has always had an intrinsic interdisciplinary content, since it builds a bridge for cross-fertilization between different disciplines （strategic marketing, strategic management, and human resources management）. This paper presents employer branding as an approach based on effective strategic organizational resources and a precise employer branding management process. In this paper, the target is to define a possible frame in order to interpret employer branding techniques as control and regulation mechanisms. Control in organizations has long been a topic of interest for researchers and practitioners, alike who generally recognize that control mechanisms are needed to ensure that organizations may achieve their goals. It has been carried out a field work on the Italian Aeronautical Meta district, that generates annual revenues equal to EUR 8.7 billion and employees 36,300 people, of whom approximately 10% are employed in the space sector. Through this field work, the intention aim is to understand if and how employer branding may create, enforce, and set up internal and shared meaning and values. In particular, stemming from the empirical research＇s evidences, this paper tries to conceptualize employer branding as a factor to persuade and influence the way that organizational actors enact in a socially constructed context. In this effort, the aim is to understand how managers may affect meanings, values goals, and opinions through an effective action on employer branding that can play a crucial role in affecting sense-making processes, meanings, interpretations of the symbolic environment. The paper therefore opens up to new horizons, since it embraces a new application for employer branding, considering it as a modern control system and proposing an innovative approach in managerial control, founded on organizational identity as a key concept in an organizational citizenship＇s perspective

Traffic-prediction-assisted dynamic power saving mechanism for IEEE 802.16e wireless MANs

How to reduce the energy consumption powered mainly by battery to prolong the standby time is one of the crucial issues for IEEE 802.16e wireless MANs.By predicting the next downlink inter-packet arrival time,three traffic-prediction-assisted power saving mechanisms based on P-PSCI,i.e.,PSCI-PFD,PSCI-ED and PSCI-LD,were proposed.In addition,the corresponding adjustment strategies for P-PSCI were also presented when there were uplink packets to be transmitted during sleep mode.Simulation results reveal that compared with the sleep mode algorithm recommended by IEEE 802.16e,the proposed mechanism P-PSCI can improve both energy efficiency and packet delay for IEEE 802.16e due to the consideration of the traffic characteristics and rate changes.Moreover,the results also demonstrate that PSCI-PFD (a=-2) significantly outperforms PSCI-ED,PSCI-LD,and the standard sleep mode in IEEE 802.16e is in terms of energy efficiency and packet delay.

Distributed Energy Saving Mechanism Based on CoMP in LTE-A System

To reduce the energy consumption of the LTE-A system,a distributed energy-saving mechanism based on Co MP(Co MPDESM) is proposed to solve the inadequate coverage problem under the dormant cells.First,the network is divided into clusters based on the equivalent cell principle.Then,we transfer global optimization into a group of subproblems.Second,a joint processing-based cooperative cell selection model is constructed to determine cooperative cells and dormant cells.Third,the compensative cells with a determined threshold are selected to control users' access.Finally,a simulation is implemented in Matlab.Results show that the energy-saving rate can reach 36.4% and that the mechanism meets the network coverage requirement.Thus,joint processing can be effectively applied in an energy saving mechanism and used to improve the network performance of edge users without increasing transmission power.

Regulation of eukaryotic DNA replication and nuclear structure

In eukaryote, nuclear structure is a key component forthe functions of eukaryotic cells. More and more evidencesshow that the nuclear structure plays important role in re-gulating DNA replication. The nuclear structure providesa physical barrier for the replication licensing, participatesin the decision where DNA replication initiates, and orga-nizes replication proteins as replication factory for DNAreplication. Through these works, new concepts on theregulation of DNA replication have emerged, which willbe discussed in this minireview.

Belt or network?The spatial structure and shaping mechanism of the Great Wall cultural belt in Beijing

The relationship between cross-regional cultural landscapes does not currently receive enough attention in cultural landscape conservation. Cultural landscapes in China are faced with the crisis of fragmentation and islanding, which makes it necessary to strengthen the idea of integrated conservation. The Great Wall cultural belt in Beijing is a cross-regional linear cultural landscape in the northwest mountainous area of Beijing. With the Great Wall as a link connecting the surrounding natural, social, and cultural resources to form a banded structure, it has the typical and practical significance of integrated conservation. Based on the theory of the cultural landscape security pattern and its ‘node – setting – connection' model, this research studies the spatial structure and shaping mechanism of the Great Wall cultural belt in Beijing from the perspective of tourist flow, using Flickr geo-tagged photos and Wikiloc tracks. The results identify the core nodes and intermediate nodes of the Great Wall cultural belt in Beijing and show that it has a multicore, multi-group hierarchical nesting structure differing from the geographic space, which has groups following the evolution orbit of ‘linear string – circumnuclear star – complete network.' To explain the differences between the cultural association network(CAN) and the geospatial network(GSN), we find that the cultural associations between nodes rely on geophysical channels, including heritage corridors and traffic passages, as physical carriers, but the nodes' attraction and their setting elements, containing natural geography environments, settlements, administrative divisions, etc., change the channel resistance, so CAN and GSN present different characteristics. From the perspective of systematic and spatial network thoughts, this study has made an attempt to adopt new analysis and research methods to achieve the integrated conservation and inheritance of linear cultural landscapes in mountainous areas.