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气温下降时养殖场动物疫病的防控措施
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作者 井红蕊 王安静 陆雅娟 《现代畜牧科技》 2016年第4期101-101,共1页
随着我国各行各业的相继发展,畜禽饲养业同样也在不断进步,养殖规模逐渐扩大,畜禽饲养量呈上升趋势。然而每年的冬季相对于其他季节的气温环境都比较低,甚至低很多,所以在气温降低的环境下,养殖场要特别注意疾病的发生,掌握相关的疾病... 随着我国各行各业的相继发展,畜禽饲养业同样也在不断进步,养殖规模逐渐扩大,畜禽饲养量呈上升趋势。然而每年的冬季相对于其他季节的气温环境都比较低,甚至低很多,所以在气温降低的环境下,养殖场要特别注意疾病的发生,掌握相关的疾病预防、管理以及紧急救治的方法,以降低养殖场的损失。 展开更多
关键词 动物 疫病 气温下降 防控
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南阳近45年气候变化分析 被引量:2
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作者 陈宝凤 王宇翔 《河南气象》 1998年第3期29-29,共1页
分析南阳气象观测站1953年建站以来45年的气候资料结果表明:50年代以来,南阳冬季变暖趋势明显,夏季气温呈下降趋势,90年代有所回升;年降水量呈减少趋势。
关键词 气候变化 降水量 冬季变暖 气温下降
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绿城的变迁
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作者 陈卫 《河南林业》 1999年第2期42-42,共1页
曾经的绿色使郑州享有“绿城”的美誉。绿色的渐褪,又使郑州风沙再起。如今,“绿城”已名不符实。拉御风沙,保卫“绿城”成为百万郑州人的共同心声。3月2日,千呼万唤始出来的郑州环城生态防护林工程终于启动,一项跨世纪的再造“绿城”... 曾经的绿色使郑州享有“绿城”的美誉。绿色的渐褪,又使郑州风沙再起。如今,“绿城”已名不符实。拉御风沙,保卫“绿城”成为百万郑州人的共同心声。3月2日,千呼万唤始出来的郑州环城生态防护林工程终于启动,一项跨世纪的再造“绿城”行动拉开了序幕。 展开更多
关键词 郑州市区 绿城 生态防护林 城市绿化覆盖率 环境质量 绿化工作 农田林网建设 总悬浮颗粒物 空气质量周报 夏季气温下降
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Regional Summer Temperature Decrease against Global Warming in China, Landform Effect? 被引量:1
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作者 LU Aigang PANG Deqian +3 位作者 HE Yuanqing PANG Hongxi WANG Tianming GE Jianping 《Journal of Mountain Science》 SCIE CSCD 2007年第1期86-90,共5页
The data of 16o national meteorological observatory (NMO) stations with long-term monthly temperature data for China were analyzed in this study to show the basin-centered summer temperature decrease against global ... The data of 16o national meteorological observatory (NMO) stations with long-term monthly temperature data for China were analyzed in this study to show the basin-centered summer temperature decrease against global warming in the past half century. The summer and winter isotherm structures of 1950s and 1990s worked out by interpolation show the isotherm structure variations: the isotherm structure generally moves northward in winter, but in summer it is characterized with separate high-temperature and low-temperature centers and the isotherm structure moves inward the centers with global warming, indicating that the temperature in the highland areas increases but that in the lowland areas decreases in the summer of the duration. The possible mechanism of the basin-centered temperature decrease in summer is discussed in this paper. 展开更多
关键词 Isotherm structure seasonal variation summer temperature decrease plateau-basin effect China
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立秋之后巧用饵
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作者 符荣财 《钓鱼》 2004年第22期15-15,共1页
8月7日12时19分立秋,立秋后说明年中天气最炎热的盛夏已过,这时的气候,早晚明显气温下降,虽说秋后还有24个“秋老虎”,但早晚人们已感到凉爽,这种气候是钓鱼的又一个黄金时段,特别是遇到阴雨天气,暑夏浮在水面的草、鲤、鲫都陆... 8月7日12时19分立秋,立秋后说明年中天气最炎热的盛夏已过,这时的气候,早晚明显气温下降,虽说秋后还有24个“秋老虎”,但早晚人们已感到凉爽,这种气候是钓鱼的又一个黄金时段,特别是遇到阴雨天气,暑夏浮在水面的草、鲤、鲫都陆续落底,加之气候凉爽,鱼类的食欲增加,给悬坠底钓者创造了极好的有利条件。 展开更多
关键词 立秋 钓鱼 操作方法 饵料配置 鱼具选择 气温下降
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The effect of evaporator operating parameters on the flow patterns inside horizontal pipes
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作者 Lige Tong Haiyan Li Li Wang Xinxing Sun Yunfei Xie 《Journal of Thermal Science》 SCIE EI CAS CSCD 2011年第4期324-331,共8页
A general and simple model for simulating the steady state behaviors of Mr-m-refrigerant fin-and-tube evaporator is introduced with the focus on the detailed flow patterns inside the tubes. In order to simulate the he... A general and simple model for simulating the steady state behaviors of Mr-m-refrigerant fin-and-tube evaporator is introduced with the focus on the detailed flow patterns inside the tubes. In order to simulate the heat transfer between air and the working fluid, the evaporator is divided into a number of control volumes. Empirical correlations from literature were also adopted to estimate the void fraction, the internal and external heat transfer coefficients, and the pressure drops. Simulations were performed to study the effects of varying inlet air temperature, refrigerant mass flow rate and evaporation pressure on the flow patterns inside the horizontal pipe of the evaporator. The simulation results indicate that the proposed model can be used to predict flow patterns well. The predicted results of the model agree well with experimental results, the difference is within ±3% for the cooling capacity, and is within ±0.2% for refrigerant evaporation temperature. 展开更多
关键词 EVAPORATOR distributed model two-phase zone flow pattern
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