Results 61 to 70 of about 816 (101)
Mechanism analysis on anisotropic degradation of sandstone in freeze thaw environment based acoustic emission [PDF]
In the freeze-thaw environments, the fracturing of bedding rock poses a significant threat to the stability of the projects in cold regions, leading to potential engineering accidents.
Bing LIU +4 more
core +1 more source
Shuitu Baochi Xuebao目的青藏高原草甸土对气候变化引起的季节性冻融频次改变尤为敏感，亟须揭示草甸土微生物活性对不同冻融循环次数的响应规律。方法选取青藏高原地区季节性冻融作用频繁的高寒草甸土为研究对象，通过非冻融与1、3、5、7、9次冻融循环模拟，对比分析典型土壤可溶性碳氮、微生物碳氮及气体碳氮的响应特征。结果1）与未冻融土壤相比，9次冻融循环后土壤微生物生物量碳显著降低23.64%，可溶性有机碳质量分数显著提升7.37%，CO2和N2O累积释放量分别增加71.09%和321.40%。2） 随着冻融循环次数增加，可溶性有机碳 ...
黄伟, 杨小艺, 李浩乐, 胡亚鲜
doaj
Shuitu Baochi Xuebao, 2022 为了解内蒙古河套灌区农田防护林内冻融期土壤水盐状况及运移规律, 在2020年10月至2021年4月实测土壤水分、盐分、温度及相关气象数据, 并进行相关分析。结果表明: 土体表层温度波动较大, 随土层深度加深土体温度变化逐渐平缓。冻结期气温下降速率低于消融期气温回升速率, 加之土壤温度变化的滞后性, 冻结期比消融期长10天左右。季节性冻融冻结作用导致表层土壤含水量升高、深层含水量降低, 消融解冻时期, 土壤含水量逐渐降低。两侧林带农田边缘(0.3 H、4 H)土壤表层含水量相比农田内部(1 H、2 H、3
郝可心 +4 more
doaj
Effects of Soluble Soybean Polysaccharide on Physicochemical Properties of Glutinous Rice Flour and Quality of Quick-frozen Sweet Dumplings [PDF]
There are some problems with quick-frozen sweet dumplings, such as poor water retention, easy freezing cracking, and high adhesiveness after cooking. To improve the quality of quick-frozen sweet dumplings, this paper investigated the effects of different
Hongwei WANG +5 more
core +1 more source
Shuitu Baochi Xuebao[目的] 研究冻融作用对东北黑土区坡面土壤侵蚀的影响,可加深对黑土坡面侵蚀过程机理的认识,并为区域侵蚀治理提供重要科学依据。[方法] 以东北黑土区单一侵蚀营力驱动的融雪、风力和降雨侵蚀为对照,通过设计冻融-融雪、冻融-风力、冻融-降雨双侵蚀营力叠加的模拟试验,分析冻融作用对坡面融雪、风力和降雨侵蚀的影响。试验处理包括1次冻融作用、2个融雪径流量(1,2 L/min)、1个风速(12 m/s),1个降雨强度(100 mm/h)和1个坡度(3°)。[结果] (1)冻融作用显著增加坡面融雪、风力和降雨侵蚀量 ...
赵娅君 +7 more
doaj
细胞松弛素B和解冻方法对玻璃化冷冻小鼠卵母细胞的影响 [PDF]
, 2007 【目的】探讨细胞松弛素B和解冻程序对玻璃微细管法（GMP）玻璃化冷冻小鼠卵母细胞的影响。【方法】以小鼠MII期卵母细胞为模型，研究冷冻前细胞松弛素B预处理、不同解冻程序对小鼠卵母细胞冷冻效果的影响；随后对经GMP玻璃化冷冻的卵母细胞直接进行培养以检测冷冻是否诱发孤雌发育。【结果】与对照组相比．细胞松弛素B预处理的卵母细胞存活率、受精率、卵裂率及囊胚率没有显著差异（89．3％vs91．3％．44．0％vs40．4％，30．0％vs27．7％，4．0％vs6．4％；P〉0．05 ...
冯贵雪 +6 more
core
Dynamic characteristics and damage model of freezing thawing red sandstone under impact load [PDF]
To study the dynamic mechanical properties and damage evolution characteristics of freeze-thaw rocks under impact loads, 0, 15, 30, 45, and 60 freeze-thaw cycle tests and dynamic impact tests were conducted on red sandstone in cold regions.
Huiming ZENG +5 more
core +1 more source
Shuitu Baochi Xuebao[目的] 揭示冻融与水力作用在不同条件下对北方土石山区土壤侵蚀的影响。[方法] 以北京市鹫峰地区土壤为研究对象,采用室内径流冲刷及冻融设备进行模拟试验,探讨在冻融与水力作用下冻融循环次数、坡度、流量、土壤初始含水率和冻融温差这5个影响因素对土壤产沙量与抗冲性的影响。[结果] (1)土壤抗冲系数对各因素敏感程度大小为坡度>流量>冻融温差>冻融循环次数>初始含水率,其中坡度与流量对其具有显著影响(p 坡度>冻融温差>土壤含水率>冻融循环次数,其中流量对其具有极显著影响(p
杨浩宇, 马岚, 陈仕媛
doaj
Shuitu Baochi Xuebao, 2023 为探明生物结皮存在时,冻融条件下结皮盖度、坡度和流量对土壤分离能力的影响,以黄土高原北部东柳沟小流域的藻结皮为研究对象,采用室内模拟冻融和放水冲刷相结合的试验方法,利用正交设计和田口方法分析藻结皮盖度、坡度、流量和冻融对土壤分离能力的影响。结果表明:土壤分离能力最大时盖度、坡度和流量分别为10%、20 °和24 L/min,而冻融次数正交设计和田口方法中分别为10,1次。冻融条件下,随藻结皮盖度的增大土壤分离能力逐渐减小;随坡度和流量的增加土壤分离能力增大 ...
朱丽琴 +4 more
doaj
Effect of L-Arginine or L-Lysine on the Quality of Duck Meat Patties during Freeze-thaw Cycles [PDF]
In this study, the effects of L-arginine or L-lysine on the quality of duck meat patties during repeated freeze-thaw cycles were studied to provide a theoretical basis for the application of L-arginine or L-lysine as cryoprotectant in meat products.
Mengmeng LI, Shufeng HE, Yangying SUN
core +1 more source