In order to complete the investigation, impersonality feasible experiment solutions and devices are designed independently to systemically investigate on activation and transfer characteristic of soil heavy metal under acid rain effect. Primary results are shown as followings:1. PH measuring results of soil solution and eluviation solution show that the ability of experimental plot the acid buffer capacity of soil is stronger under the experiment condition,there is no obvious acidification in soil which after acid rain eluviation.The result has substantial differences with that gotten by most of investigationers in similar work before.

這一結果與以往類似研究中多數研究者得到的結論存在本質區(qū)別，原因可能在于此次試驗的試驗條件與以往研究的試驗條件不同h片在线观看视频免费播放，其中最主要一點是在本次試驗中使用的土壤樣品的重量比以往試驗均顯著增大榴莲视频ios网址链接，而且使用的是土壤結構和組成等均未經破壞的原位土，從而使入滲酸雨與承受酸雨沉降的土壤之間的比例關系更接近自然酸雨沉降過程97人妻a，以此為基礎得到的試驗結果應該更加客觀xxxx激情、可靠小草无码免费视频。2、酸雨對鹽基離子活化遷移產生的影響勿庸置疑国产无遮挡又黄又爽不卡，但是在线网址你懂的，在鹽基離子活化遷移的過程中，并沒有出現預想中的重金屬元素活化遷移現象国产原创精品无遮挡v视觉影院，表明土壤中的重金屬元素并不如理論分析的那樣對酸雨沉降反應敏感91网站在线观看国产一区。

I must live like an exile, if I approach near to people a hot terror seizes upon me, a fear that I may be subjected to the danger of letting my condition be observed - thus it has been during the past year which I spent in the country, commanded by my intelligent physician to spare my hearing as much as possible, in this almost meeting my natural disposition, although I sometimes ran counter to it yielding to my inclination for society, but what a humiliation when one stood beside me and heard a flute in the distance and I heard nothing, or someone heard the shepherd singing and again I heard nothing, such incidents brought me to the verge of despair, but little more and I would have put an end to my life - only art it was that withheld me, ah it seemed impossible to leave the world until I had produced all that I felt called upon me to produce, and so I endured this wretched existence - truly wretched, an excitable body which a sudden change can throw from the best into the worst state - Patience - it is said that I must now choose for my guide, I have done so, I hope my determination will remain firm to endure until it please the inexorable Parcae to bread the thread, perhaps I shall get better, perhaps not, I am prepared.

我不得不活著像個流放的人，要是我接近人群久999，恐懼就會涌上心頭99热网址，唯恐別人發(fā)現我病情。半年來我就是這樣過來的aaaa69。一位高明的醫(yī)生讓我盡量避免使用聽覺国产又粗又猛又大的视频在线播放，而也差不多正合我愿，所以這半年來我一直呆在鄉(xiāng)下黄色网站毛片网站。不過欧洲美州亚洲妇女操b黄色视频，有時我也會違背醫(yī)囑，忍不住想與別人交往久久99久久992019，但是日韩激情影院无码视频，當我旁邊的人聽到遠處的笛聲而我卻什么都聽不到，或是別人聽到牧羊人的歌聲而我又什么都聽不到的時候亚洲毛片在线直播大全，那是怎樣一種屈辱的感覺芭访佬园谙叩缫挥啊！這些事情讓我瀕臨崩潰三级片黄色A片在线免费观看一区，要不是對藝術的渴求制止了我，我差不多就要結束我的生命了91超碰在线中出。我知道沒把我命里所有的作品都創(chuàng)造出來日本高潮视频，我是不可能離開這個世界的，所以我忍受這痛苦的生活日本黄页在线网站免费大全，真的痛苦吧酆仙莺萏焯熳酆仙玥。∥业纳眢w容易激動一级婬片A片试看一进一出，突然有一點變化亚洲精品综合欧美极品，就會一下子從最好變成最壞。我必須選擇忍耐欧美一级爽爽在线播放，別人這么說舔操干视频，我也這么做了。希望我有足夠堅定的意志來承受苦難国产熟女老妇乱视频，直到無情的死神割斷我的生命之線的那天激情国产黄色。也許我的病會好轉黄色在线视频永久免费，也許不會，對此我都是有心理準備的一级A片刺激高潮视频在线观看。

As soon as the eldest was fifteen,she was allowed to rise up to the surface of the ocean.when she came back,she had hundreds of things to talk about ;but the most beautiful,she said,was to lie in the moonlight,on a sandbank,in the quiet sea,near the coast,and to gaze on a large town nearby,where the lights were twinkling like hundreds of stars;to listen to the sounds of the music,the noise of carriages,and the voices of human beings,and then to hear the merry bells peal out from the church steeples

當她返回家的時候她說的各種各樣千奇百怪的事情十八禁的动漫视频网站，但是最令她感到滿意的是，當她坐在布滿月光的沙灘上亚州天堂在线观看，守著靜靜的大海狂草草操操操，在靠近海岸的地方，注視著就在眼前的城市村鎮(zhèn)黄色视频看看，那里的燈光就象成百上千的星星在閃爍泰国女人一级AⅤ视频免费看，耳朵里可以聽到音樂聲馬車的嘈雜聲，人類的聲音国产AV日产AV，還有從教堂尖塔上傳過來的有趣的鈴鐺聲97精品视频共享总站，但是她不能太接近這些美妙的東西，她是多么想再次去到海上去啊

The paper investigates both block-type pilot linear minimum mean square error algorithm and IEEE802.16 OFDM channel estimation analysis. Simulation results confirm the block-type pilot structure is more suitable for IEEE802.16 system. An optimal pilot setting algorithm, based on space frequency domain, is explored and the pilot chart is presented. The proposed algorithm finds its application in MIMO-OFDM. Simulation results show the algorithm presents a good approximation to the perfect channel state information curve, with about 2dB difference in SNR. The simulation results also demonstrate the algorithm achieves fairly high stability in the environment of fast fading, performance of the proposed algorithm is better that of pilot training channel estimation.3. Taking into account the characteristics of IEEE802.16 OFDM system, OFDM system simulation platform is constructed in Matlab, exploiting simulink as a tool. OFDM modulation and demodulation simulation system are configured on LabVIEW platform. All the system signal processing is simulated, including defining system parameters, designing modulation model, and verifying all the proposed algorithms under different environments, such as white Gaussian noise, multi-path fading, with or without guard interval etc. Bit error performance is evaluated. The research provides valid theoretical basis for practical OFDM system performance evaluation.4. Taking advantage of software radio, the paper designs a hardware platform with both 256-IFFT/FFT and 512-IFFT/FFT OFDM schemes co-existing in one platform. You can predetermine one from the two schemes to carry out almost the same model function with different system performance and parameter setting.5. Referring to IEEE802.16 standard, the paper proposes a design method for generating signals and frames suitable for laboratory investigations implemented in laboratory environment.6. Based on 6701evm digital evaluation card, combined with analogy front-end, the paper designs a DSP software model to deal with baseband signal processing. An overall OFDM scheme, with modulation and demodulation function, is accomplished.

討論分析了MIMO-OFDM中一種基于空頻域的最優(yōu)導頻設置算法欧美激情片在线观看，給出了導頻圖案日韩福利国内主播在线观看，通過仿真實驗表明，該算法與理想的信道狀態(tài)信息曲線非常接近免费网站日本黄色片永久免费观看，信噪比差距約在2dB左右91精品资源粉嫩人妻，并且在快衰落條件下具有較好的穩(wěn)定性，其性能要優(yōu)于基于前導訓練的信道估計方法人人摸人人干人人操人人舔。3一级特黄a爱激情影院、根據IEEE802.16OFDM系統(tǒng)特點，論文分別在Matlab中應用Simulink工具構建OFDM系統(tǒng)仿真平臺另类A片、在LabVIEW平臺上實現了OFDM調制解調仿真系統(tǒng)蜜桃无码成人影片在线播放网站免费，模擬了整個系統(tǒng)的信號流程，進行了OFDM仿真系統(tǒng)參數的選擇和調制模塊的仿真設計四虎成人最新影院网址在线观看免费、論證各算法性能亚洲福利视频专区，并根據各種不同的條件：例如高斯噪聲、多徑衰落影音先锋5566乳爆制服、有無保護間隔等国产多人在线，對系統(tǒng)的誤碼特性進行了評估，為正確評價實際OFDM系統(tǒng)的性能提供了有效的理論依據人人看人人摸人人草。4亚洲欧美va在线播放、論文以軟件無線電思想作為指導，提出了以256點IFFT／FFT為核心和以512點IFFT／FFT為核心的兩種OFDM算法模式并存于同一個硬件平臺激情淫荡乱伦小说图片、且可預選的方案黄片2级，它們在參數選取和性能指標上有所差異，均實現了相似的模塊和功能。588黄色网站、論文參考IEEE 802.16無線網絡標準的參數設置三级日本在线看，針對本設計系統(tǒng)的應用環(huán)境和系統(tǒng)硬件的性能速率，提出了一種應用于實驗室環(huán)境的信號結構国产情侣A片A毛片、幀格式等參數設計日韩三级片大全。6、論文基于TI公司的6701evm數字評估板卡国模冰冰大胆裸体写真，結合模擬前端搭建數字中頻平臺国产精品国产首页，設計了基帶處理的DSP軟件模塊并進行系統(tǒng)調試，基本實現了一套完整的OFDM調制解調方案日韩自拍另类丝袜视频。