Results 101 to 110 of about 447 (144)

地形对黑土区典型坡面侵蚀―沉积空间分布特征的影响*

, 2016
研究地形对黑土区坡面侵蚀－沉积空间分布特征的影响可以为水土保持措施配置提供 科学依据。以典型黑土区——黑龙江省宾县东山沟小流域为研究区域，在流域上游、中游和下游各选 取2个典型坡面，坡面种植作物均为玉米。典型坡面坡顶、坡上、坡中、坡下和坡脚的平均坡度分别为 3.1°，3.0°，4.0°，2.8°，1.2°。利用137Cs示踪技术，分析了坡度、坡长和坡形对坡面侵蚀—沉积空间分 布特征的影响。结果表明：研究流域农耕地坡面以侵蚀为主 ...
杨维鸽, 王占礼, 郑粉莉, 韩勇
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[Allergen Analysis of 4622 Children with Allergic Diseases in Shaanxi Province]. [PDF]

Sichuan Da Xue Xue Bao Yi Xue Ban, 2021
Jia YY, Wu HJ, Luo JF, Wu C, Wang XZ, Zhang PP, Jing ZH, Ding YN, Li N, Cui JX, Li QH, Sun X.   +11 more
europepmc   +1 more source

Impact of socioeconomic status，population mobility and control measures on COVID-10 development in major cities of China. [PDF]

Zhejiang Da Xue Xue Bao Yi Xue Ban, 2021
Wang S, Ye Y, Xu X, Wang S, Xu X, Yuan C, Li S, Cao S, Li W, Chen C, Hu K, Lei H, Zhu H, Zhu Y, Wu X.   +14 more
europepmc   +1 more source

CONTRIBUTION PARTITION OF WATER AND WIND EROSION ON CULTIVATED SLOPES IN NORTHEAST BLACK SOIL REGION OF CHINA

, 2010
用137Cs含量测定和USLE水蚀预报模型,研究了东北黑土区2块坡耕地的水蚀与风蚀速率,结果表明:直型坡耕地和凸型坡耕地的年均侵蚀速率分别为3054和3548t.km2.a-1;由于坡向的不同,2块坡面的风蚀速率分别为631和1155t.km2.a-1,即研究区每年约有0.5～1.0mm的表层土壤被风吹蚀掉,风蚀分别占总侵蚀的20.7%和32.6%;而水蚀仍为研究区主要的侵蚀方式,2块坡面的水蚀速率分别占总侵蚀的79.3%和67.4%。因此,东北黑土区坡耕地水土流失的防治要充分考虑水和风的不同影响 ...
刘普灵, 杨明义, 王禹
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[The modified Chinese version of Wong and Law Emotional Intelligence Scale for measurement of emotional health: revision and psychometric evaluation]. [PDF]

Nan Fang Yi Ke Da Xue Xue Bao
Xiao R, Lü X.
europepmc   +1 more source

黑土氮肥氨挥发损失特征研究

, 2009
采用密闭室法测定土壤氨挥发通量,进而计算施入土壤中氮肥的氨挥发损失量,研究了东北黑土区不同作物施氮量和施肥深度下氮肥的氨挥发。结果表明,施用尿素促进了农田氨挥发损失,并随施肥量的增加而增加,当表施氮量30 g/m2时,氨挥发损失率达21.68%。在相同施氮量的条件下,随施肥深度的增加而减少,当施肥深度为9cm,施氮量30 g/m2时,氨挥发损失率仅达2.49%。氨挥发损失氮量与施氮量(>0)呈抛物线性关系。推荐东北黑土区种植大豆优化施肥深度在3 cm以下;而玉米基肥优化施肥在6 cm以下 ...
乔云发, 王树起, 赵兰坡, 韩晓增   +3 more
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[Expert consensus on the diagnosis, treatment, and prevention of neonatal dengue, chikungunya, and Zika virus infections (2025)]. [PDF]

Zhongguo Dang Dai Er Ke Za Zhi
Perinatal Group, Pediatric Branch of the Chinese Medical Doctor Association; Editorial Board, Chinese Journal of Contemporary Pediatrics.   +2 more
europepmc   +1 more source

[Clinical practice guideline for pediatric scar prevention and treatment (2025 edition)]. [PDF]

Zhonghua Shao Shang Yu Chuang Mian Xiu Fu Za Zhi
Chinese Burn Association.
europepmc   +1 more source

[Methods of improving the mechanical properties of hydrogels and their research progress in bone tissue engineering]. [PDF]

Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi, 2021
Li Y, Zhou J, Hu S, Wang J, Wang K, Wang W.   +5 more
europepmc   +1 more source

东北黑土区大豆生产中存在的主要问题、技术需求及发展对策

, 2009
通过对巴彦县、绥棱县、海伦市、五大连池市和嫩江县的调查,总结了影响东北黑土区大豆生产的关键技术和主要因子,提出了目前大豆生产中的主要问题和技术需求,在此基础上给出了解决对策和发展对策 ...
邹文秀, 韩晓增
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