1Niche construction can lead to stable coexistence of diverse genotypes in spatially structured population, which supports a stable polymorphism even without heterozygote superiority.(2)With habitat deterioration, niche construction accelerates the formation of steady polymorphism and hence impedes the harmful influences of environment on the population, which might embody a life-history strategy of organism under the unfavorable environment.(3)Niche construction results in the coexistence with alternative polymorphism through genotype-environment feedback and limited gene flow.(4)The niche-constructing organism is an active force to alter its environment and hence the direction of natural selection in order to better survival.(5)Spatial dynamics and distribution pattern of metapopulation are profoundly influenced by time-lagged niche construction.(6)Metapopulation size can reach a fixed level in the recency effect and equal weighting of time lag but is statistical stability in primacy effect, which implies the primacy effect is most remarkable.(7)The increment in the relative weightingof each generation\' niche construction and the length of time lag are significant factors for system destabilization.(8)Moderate capacity of positive niche construction benefits the metapopulation persistence.(9)The narrowing of niche breadth can decrease the metapopulation size and thereby increase the extinction risk.(10)The coupled function of time lag and niche construction make the system oscillation and generate the spiral wave, spiral-broken and circular wave in heterogeneous habitat.The spatial distributions of metapopulation and resource content are complementary due to a phase lag of their both frequencies.(12)Metapopulation persistence with niche construction depends not only on the balance between colonization and extinction, but also on the balance between the ability of niche construction and natural dissipation of habitat.(13)Metapopula-tion can survive under certain condition when the percent of suitable patches in habitat is lower than the ration of extinction to colonization.(14)Two thresholds exist in the process of transition of habitat quality dynamics from unsuitable to suitable, which include the intensity of niche construction and the initial condition of system.(15)Metapopulation size is positive correlated with the ability of positive niche construction, which means that organism or population who has strongly positive influences on their environment plays an important role to maintain the available habitat.

通過(guò)上述幾個(gè)方面的研究，主要得出以下15條結(jié)論：(1)生態(tài)位構(gòu)建可使空間結(jié)構(gòu)種群欧美三p，甚至是在沒(méi)有雜合子優(yōu)勢(shì)的條件下97在线视频人妻无码一期，形成多種可能的穩(wěn)定基因型分布模式；(2)隨著環(huán)境的破壞與惡化18岁禁看的黄片，種群的生態(tài)位構(gòu)建作用加速其較早形成穩(wěn)定多態(tài)以阻礙環(huán)境對(duì)種群的不利影響一级黄免费网站，解釋了有機(jī)體在不利環(huán)境下的一種生活史對(duì)策；(3)生態(tài)位構(gòu)建作用通過(guò)基因型—環(huán)境反饋機(jī)制及有限的基因交流導(dǎo)致基因型多態(tài)的穩(wěn)定共存司机av在线播放；(4)有機(jī)體的生態(tài)位構(gòu)建作用是一種積極的動(dòng)力改變環(huán)境進(jìn)而改變其自然選擇的方向；(5)生態(tài)位構(gòu)建的時(shí)滯作用對(duì)集合種群動(dòng)態(tài)和空間分布產(chǎn)生深刻影響国产污片免费；(6)集合種群大小在時(shí)滯的嶄新效應(yīng)和等權(quán)重效應(yīng)下達(dá)到一固定值av在线你懂得，而在首位效應(yīng)下達(dá)到統(tǒng)計(jì)穩(wěn)定，表明首位效應(yīng)的影響最顯著强插在线观看；(7)首位效應(yīng)下生態(tài)位構(gòu)建相對(duì)權(quán)重的增量和時(shí)滯的長(zhǎng)度是影響系統(tǒng)不穩(wěn)定性動(dòng)態(tài)的關(guān)鍵因素操美国美女；(8)適中的生態(tài)位構(gòu)建強(qiáng)度有利于集合種群的續(xù)存；(9)生態(tài)位寬度變窄會(huì)減少集合種群的數(shù)量從而增加其滅絕風(fēng)險(xiǎn)搞那个黄色片来看一下；(10)時(shí)滯和生態(tài)位構(gòu)建的雙重作用使系統(tǒng)產(chǎn)生周期振蕩日本一区二区久久人妻高清，并在異質(zhì)性環(huán)境中產(chǎn)生穩(wěn)定的螺旋波，破碎的螺旋波和環(huán)形波三種分布模式2017av在线视频；(11)集合種群與資源含量的空間分布因?yàn)橄鄿パa(bǔ)黄色一级国产视频；(12)具有生態(tài)位構(gòu)建的集合種群續(xù)存不僅取決于侵占率與滅絕率之間的平衡黄色视频免费看在线的，而且依賴于生態(tài)位構(gòu)建能力同其生境的自然消耗速率之間的妥協(xié)；(13)當(dāng)生境中適合侵占的斑塊比例小于其侵占率與滅絕率之比時(shí)级特大黄片视频影院春色，生態(tài)位構(gòu)建作用促使集合種群在一定條件下續(xù)存：(14)生境斑塊的狀態(tài)從不適合到適合轉(zhuǎn)變過(guò)程中存在生態(tài)位構(gòu)建強(qiáng)度和系統(tǒng)初始條件這兩個(gè)閾值97cao在线播放；(15)集合種群的大小同正生態(tài)位構(gòu)建能力正相關(guān)，意味著對(duì)環(huán)境具有較強(qiáng)正作用的有機(jī)體對(duì)維持有效生境起積極作用鸥美性爱操逼视频。

The results showed that the different cut sites had the different RBSN and RQ. The superiority in RBSM occurred in the body segments with heart and clitellum, with head or only without head, the body segment number which remaining above 1/2, while the other groups had fewer RBSN.

切后都保留了心臟人人干人人爱人人插、生殖環(huán)、腦或只切除了腦毛片一区二区三区四区播放，所剩體節(jié)數(shù)均在實(shí)驗(yàn)所用蚯蚓的體節(jié)數(shù)的1/2以上的蚯蚓體段国产精品热门Jizz最近更新，再生體節(jié)數(shù)明顯，其它各體段組再生體節(jié)數(shù)不明顯或無(wú)日韩天堂免费视频在线。

RESULTS: Combining randomized and observational cohorts, 113 patients with workers' compensation and 811 patients without were followed for 2 years.

結(jié)果：將隨機(jī)試驗(yàn)和觀察隊(duì)列相結(jié)合人人摸'人人操人人，113例具有勞工補(bǔ)償?shù)幕颊吆?11例不具有勞工補(bǔ)償?shù)幕颊唠S訪2年。

A great amount of tested results indicate that the neural parallel control method can achieve better control performance than the conventional control methods without neural compensational controller.

大量的實(shí)驗(yàn)數(shù)據(jù)表明在线播放欧美特级黄色视频，神經(jīng)網(wǎng)絡(luò)并行補(bǔ)償控制方法的控制效果明顯優(yōu)于無(wú)神經(jīng)網(wǎng)絡(luò)補(bǔ)償?shù)慕?jīng)典控制方法www.huicheng99.com。

The results show that the driving force angle and the pressure angle are complementary angle each other,i.e.α+δ=90°,the condition for pure rolling without sliding of toggle plate is δ≤φ and independen...

結(jié)果表明，傳力角與壓力角互為余角一区一本久久，即α+δ=90°天天插天天狠天天透伊人，肘板機(jī)構(gòu)純滾動(dòng)而無(wú)滑動(dòng)的條件是δ≤φ，保證肘板純滾動(dòng)而無(wú)滑動(dòng)的條件與肘板的擺角無(wú)關(guān)唯美囗交视频系列全集。

We work very hard to keep our system simple without compromising on the quality of results.

在保證搜索結(jié)果質(zhì)量的情況下我們盡量保持系統(tǒng)的簡(jiǎn)潔AV无码永久免费网站。

Results also suggest that declarative knowledge is built in relations with object's experience, and was connected to form procedural knowledge in the process of finding ways. As for the transformation between procedural knowledge and configurational knowledge, objects can do it through mental process without maps, yet maps still provide a reference frame for it.

其中，敘述性知識(shí)的建立是與經(jīng)驗(yàn)相關(guān)的丝瓜视频成人无限看免费下载，能在找尋路徑的過(guò)程中獲取国内主播直播在线观看，并加以聯(lián)結(jié)形成程序性知識(shí)；程序性知識(shí)與結(jié)構(gòu)性知識(shí)的轉(zhuǎn)換色欧美色亚洲，則可依個(gè)體的心智過(guò)程或藉由地圖的輔助提供架構(gòu)国产特色AAAAA级毛片。

Based on the equilibrium equation of an arch element the cubic nonlinear dynamic model with second order is established and the nonlinear differential dynamic system without constant term is obtained through a transfer process of T=U+b. Hence three fixed points and the homoclinic orbits are found. The critical condition of the chaotic vibration of the elastic arch is given by using the method of Melnikov function. The numerical results of the stationary and chaotic motion are given and discussed.

首先利用拱的單元平衡方程建立了拱的二階三次非線性動(dòng)力學(xué)模型；然后通過(guò)變換使方程轉(zhuǎn)化為不含常數(shù)項(xiàng)的非線性微分動(dòng)力系統(tǒng)jizzjizzxxxx，并由此得到無(wú)擾動(dòng)系統(tǒng)的3個(gè)不動(dòng)點(diǎn)與同宿軌道日韩免费在线综合；再用Melnikov函數(shù)法給出了發(fā)生混沌的臨界條件；最后給出了該系統(tǒng)出現(xiàn)定常運(yùn)動(dòng)和混沌運(yùn)動(dòng)的數(shù)值結(jié)果91网在线。

These results include several sufficient conditions for the global exponential stability of general neural networks with time-varying delays and without monotone, bounded, or continuously differentiable activation function.

不同于已有文獻(xiàn)用Liapunov函數(shù)或泛函法研究穩(wěn)定性問(wèn)題時(shí)有色又黄有高潮的免费视频，將時(shí)滯項(xiàng)作為干擾處理的方法，給出了利用時(shí)滯項(xiàng)讓系統(tǒng)穩(wěn)定的結(jié)果欧美福利精品。

The simulation results also verify that the algorithm exhibits corking robustness against the external interference and modeling errors. Ideal control effect can be achieved without changes of the algorithm and its parameters in time-delay system, non-minimum phase system, unstable object, non-linear system and MIMO system. It is so that why this algorithm has generality and is easy to use, which is favorable for the application and generalization of predictive control.

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