Analysis of Reliability of the Harary Graph

When the vertices fail independently with each other by a constant probability,the reliability of a sraph is defined to be the probability that the graph results from deleting thefailed venices together with the incidence edges is connected. The Harary graph,a class of graphswith the best connectivity is considered in this paper,the bound of it's reliability is obtained,and theasymptotic property of reliability is also analysed.     

轴流风机通风降温试验

在现有通风系统的基础上，六个风道内各安装一台活动式可拆卸轴流风机，冬季启动风机进行通风，取得了良好的通风降温效果，达到了通风降温目的，且通风均匀，能耗低，减轻了操作劳动强度。并且拆卸方便，不影响风道密闭隔热。     

普×爆F2代膨爆特性的分离特征研究

对两个普×爆组合F2代群体膨爆特性的分析结果表明，F2代膨爆特性较差，采用常规系谱法从中选育出优良爆裂玉米自交系的机率较小；膨爆特性可能是由主效基因存在的多基因控制的数量性状；各性状间多呈显著或极显著正相关，膨化体积对膨化倍数的直接正向作用最大，百粒重的直接负向作用最大，穗粒重和爆花率主要通过膨化体积起正向间接作用。     

棉花对淹水胁迫的适应机制

淹涝是造成棉花减产的重要灾害因素。在淹水胁迫下,棉花的生长发育会受到不利影响,中、重度持续淹水还会引起棉花减产甚至绝产。但是,棉株自身具有完整的适应保护机制,遭受淹水胁迫后通过启动逃避机制、静止适应机制和再生调节补偿机制,适应淹水胁迫、减少涝害损失。本文重点就棉花对淹水胁迫的3个适应机制进行了详细论述,就淹水胁迫对棉花生长发育、生理特性和产量性状的影响以及缓解棉花淹水伤害的主要措施与方法也作了简要评述。     

桃叶片POD、SOD、CAT活性与树体矮化和生长的关系

为探讨矮化桃树的酶学机制，笔者以普通型桃-春艳、短枝型桃-超红短枝和极矮化型桃-寿星桃叶片为试材，对其生长期中过氧化物酶（POD）、超氧化物歧化酶(SOD)、过氧化氢酶（CAT）的活性与树体矮化和生长的关系进行了研究，以期为桃树矮化密植、丰产优质和优良短枝型品种的选育提供理论依据。结果表明，三种生长类型桃叶片内POD、SOD、CAT活性均达到了极显著水平，但季节性变化规律相似；酶活性的大小与桃树的矮化程度密切相关，即极矮化型桃的酶活性〉短枝型桃的〉普通型桃的，且POD的活性与树体生长势在三类型桃间均呈显著负相关；超红短枝叶片内SOD活性和寿星桃叶片内CAT活性与其对应的节间长度间的差异均达到了显著负相关水平。所以POD活性可以作为矮化品种的一个预选指标。     

THE WAYS FOR IMPROVING INDOOR ENVIRONMENT AND AIR-CONDITIONING SYSTEMS IN DANCLING HALLS

Since 1988, air temperature, humidity, air quality, noise level and intensity of illumination in lots of dancing halls in China have been investigated and tested. This paper introduces the present situation of indoor environment and air conditioning systems in dancing halls of China. The design indexes of cooling load for room and ontside air are recommended. The reasons for indoor environment deterioration have been found out. From the actual situation of China, the ways for imoroving indoor environment and approach of energy conservation in air conditioning systems are explored.     

小麦与山羊草双二倍体抗病性的研究与利用

本文报道了波斯小麦与粗山羊草(5个品系),小伞山羊草和卵穗山羊草双二倍体及其亲本的抗叶锈和白粉病鉴定结果。粗山羊草对叶锈的抗性受波斯小麦品系 PS 5(不抗叶锈)的抑制,在双二倍体中不能表现。小伞山羊草和卵穗山羊草对叶锈的抗性不受波斯小麦的影响,能在双二倍体中充分表达。以对白粉病免疫的波斯小麦为母本与免疫的山羊     

Fine mapping of the genetic locus L1 conferring black pods using a chromosome segment substitution line population of soybean

The colour of plant organs is a useful trait in crop breeding. The pod colours of soybeans primarily include black, brown and tan types, which are controlled by two classical genetic loci, L1 and L2. Most wild soybeans have black pods, which reflect a possible role in adaptation to the natural environment. Here, an improved chromosome segment substitution line (CSSL) population SojaCSSLP3 was established to identify the L1 gene. The segment on the 19th chromosome represented by the SSR marker Satt313 was found to link with locus L1. The region was further delimited three times with increased SSR and InDel markers using a population derived from a heterozygous plant of CSSL124 from SojaCSSLP3. The L1 gene was finally located in a 184.43‐kb region between SSR_19p09 and Indel_19P7. Thirteen putative genes in this region were analysed with qRT‐PCR. The expression level of Glyma19 g27460, which is a member of the SANT superfamily with a MYB DNA‐binding domain, was significantly upregulated in black pods and was recognized to be the most likely candidate for the L1 gene.     

遵义大棚蔬菜不同种植模式的经济效益探讨

为了分析遵义大棚蔬菜不同种植模式的经济效益,为有效利用现代设施,扩大蔬菜生产规模,寻求增产增收的高效种植模式和管理方法提供依据,调查并统计了遵义不同地区大棚蔬菜的种植模式、种植成本和经济效益。结果表明,遵义大棚蔬菜不同种植模式的种植成本及经济效益差异显著,其中"育苗+豆类+叶菜"模式的年纯收益最高,达到16696元/667m2。根据市场需求,选择合适的种植模式,能够进一步提升大棚蔬菜经济价值,提高农民收入。