为解决推荐系统中的冷启动问题,在协同主题回归CTR模型的基础上引入堆叠去噪自编码器SDAE深度学习网络,用于学习用户辅助信息的隐表示,建立SDAE-CTR模型。模型应用2层SDAE网络,以用户信息为网络输入量,将编码过程获得的用户辅助信息的隐表示和解码过程获得的输入近似表示为网络的双输出量,最小化用户辅助信息和近似表示的差值来确定最优隐表示。模型融合用户-项目评分矩阵(冷启动条件无评分)、项目内容信息和用户辅助信息实现用户对未评分项目的评分预测,并在LastFM、Book Crossing和MovieLens数据集上从推荐准确度、新颖性和用户冷启动条件下的推荐效果等3方面对SDAE-CTR模型和CTR模型进行比较。结果表明,SDAE-CTR模型在冷启动或非冷启动的条件下,推荐效果都要优于CTR模型的,虽然新颖性较CTR模型稍微逊色一些,但理论上在合理的范围内,总体上SDAE-CTR模型表现较优。

以大扁杏营养器官根、茎、叶作为供体材料,花生、玉米、大豆种子作为受体材料,开展林农复合生态系统大扁杏营养器官对农作物种子的他感作用实验研究.研究结果表明:大扁杏根浸提液对3种农作物种子萌发都有抑制效应,其中对花生种子萌发抑制效应最弱;茎浸提液对玉米种子萌发有明显的抑制效应,对大豆种子的萌发具有协同促进效应,对花生种子萌发无影响;叶浸提液对供试农作物种子萌发均有抑制效应,其中对大豆种子萌发抑制效应最显著,对花生种子萌发抑制效应不明显.构建大扁杏优质农林复合系统应首选大扁杏—花生复合模式.

The dynamic evolution of soil enzyme activity in the early construction of agroforestry systems for Prunus armeniaca& Pyrus ussriensis in Low-hilly Region of Fuxin City was studied .Result shows that :the soil enzyme activity in soil surface layer is higher than that of the deep layer in each agroforestry systems .In the growing season of plants ,the activity of catalase ,urease & invertase appear different characteristics :catalase all appear “ridge change” and their activity are the highest in July ;in the agroforestry systems of Py rus ussriensis ,urease activity show linear growth and reach the highest activity in September .Urease appears variation characteristics that in-crease firstly and then decrease in the agroforestry systems of Prunus armeniaca .In all kinds of agroforestry sys-tems ,invertase activity is low in June ;it rise in June to August and begin to gradually reduce in September .Three kinds of soil enzyme activity have relationships ,among of them urease &invertase activity are most closely related , and the coefficient is above 0 .713 .

Fuxin area is the main demonstration base to cultivate peanut in our country. After the peanut harvest, peanut field is in an exposed state, surface being without vegetation. The soil is easy to be affected by wind erosion and that makes the decline in soil fertility, and environment was damaged. Through experiments of controlling wind erosion on peanut field of Fuxin area, result shows that wind break function of liquid film on peanut field is so significant that the moisture content of peanut field is higher than Ck. Using liquid film can not only promote growth of peanut, but also increase yield of peanut.

The suitable assessment of reclaimed land is the premise and basis to make land reclamation scheme for reasonable reclamation and using reclamation land resources to provide scientific basis.Taking clay mine of Fengjia brick factory in Zhangwu county of Fuxin city as an example,combining with the mining natural conditions practical situation,the mine reclamation land was divided into the corresponding evaluation units,and the major damage type of the units were determined.Referencing forest land suitability assessment indexes,the final of the land reclamation direction for each unit was determined.Result shows that the major damage types of the units are digging occupation;the direction of the land reclamation for each unit is forest land.

Research was conducted in the substrate amendment of coal-gangue pile in Luan Coal Mine with the soil from the farm land and organic fertilizer according to the different proportion ratio(volume) into 4 kinds of improver improvement as the soil amendment.After the amendment,the average pH value of substrate was regulated from 6.23 to neutral;nitrogen content reached 41.36 mg/kg,4.61 times higher than that of the control;available phosphorus content reached 10.25 mg/kg,3.18 times higher than that of the control,available potassium content reached 458.01 mg/kg,2.46 times higher than that of the control,which greatly motivated the taproot of height,ground diameter growth and crown diameter growth of Amorpha fruticosa.Statistics and experimental result showed that matrix:70% coal-gangue+15% soil+15% organic fertilizer had significant amending effects on the substrate.It was an effective access to conduct the substrate amendment to coal-gangue piles and also one of the best ways to reutilize the solid waste disposal rationally.