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fluctuating
相关语句
  波动
     From the day 3 prior to foaling till the third st- age labour,both levels were fluctuating between 7.10 ng/ml and 8.17 ng /ml for progesterone,and 30.3 pg/ml and 57.6 pg/ml for 17β-estradiol with no significant differences(P>0.05).
     分娩前3天至胎衣排出期的孕酮和17β-雌二醇水平分别波动于7.10~8.17ng/ml 和30.3~57.6pg/ml 之间,无显著差异(PΚ0.05)。
短句来源
     Anemia from the population of Shanxi includes 45.1% of diploid (2n = 42), the chromosome number fluctuating from 17-84;
     山西卤虫有2倍体(2n=42),占45.1%,染色体数的波动为17—84;
短句来源
     ②The positive expression of ER-α in spleen had a fluctuating downtrend, and obviously lower in the control groups at month 16 than at month 4 (9 384.605±446.939, 12 813.915±770.039, P < 0.01).
     ②与4月龄对照组比较,10,12,14,16月龄对照组大鼠脾脏雌激素受体α的阳性表达(A)呈波动性下降,其中16月龄对照组明显低于4月龄对照组(分别为9384.605±446.939,12813.915±770.039,P<0.01)。
短句来源
     A Robust H_∞ Control for the Fluctuating Price System
     波动性价格系统的H_∞鲁棒控制
短句来源
     The wastewater [ρ(oil)=56 000 mg/L] was treated in the fluctuating period of wastewater quality, the reduction of oil was 99.6% at ρ(LBT)=22 mg/L,the oil content was about 220 mg/L.
     在水质波动期 ,ρ(油 ) =5 60 0 0mg/L的含油污水 ,在投药量ρ(LBT) =2 2mg/L时 ,处理水含油2 2 0mg/L左右 ,去除率 99.6%。
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  脉动
     Determination of fluctuating wind loads is necessity to high-rise building design.
     风荷载是强风区高层建筑的主要侧向控制荷载,确定脉动风荷载是高层建筑结构设计的需要。
短句来源
     Prediction and Analysis of Fluctuating Pressure at Transonic Mach Numbers and Nonlinear Characteristic of RB Convection System
     跨音速脉动压力及RB对流系统非线性特征的预测与分析
短句来源
     This paper studies the instantanious delivery, delivery fluctuating rate and fluctuation frequency of the Z=5 and 6 sector-slider pump, establishes relevant mathematical model, and provides theoretical basis for the design and calculation of the 5, 6 sector-slider pump.
     研究Z=5和6扇形滑块泵的瞬时流量,流量脉动串和流量脉动频率,建立相应的数学模型,为5,6扇形滑块泵设计计算提供理论依据。
短句来源
     Regarding fluctuating wind as white noise excitation and using Davenport wind speed spectrum respectively,based on the building load code (GBJ9-87),the dynamic reduction factors (DRF 1 and DRF 2) for the tall steel structure_TMD system have been formulated.
     分别将脉动风视为白噪声和采用Davenport风速谱 ,基于建筑荷载规范GBJ9-87,导出了高层钢结构_TMD系统减振系数DRF1和DRF2 。
短句来源
     Simulation of Random Fluctuating Wind Speed Based on Wavelet Method
     基于小波方法的随机脉动风模拟
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  起伏
     Probability of Detection for Fluctuating Target Signals of Rice Distribution
     对雷达目标回波信号按Rice律起伏时检测概率的研究
短句来源
     Base on the basic infrared physical law and combining the air electro-optical surveillance principle and the changing conditions of ground-background temperature, the paper presents an approach that the average thermal infrared penetrating rate index of thermal infrared radiation of camouflage net can be determined by the radiation brightness of targets and background in working wave band and the fluctuating extent of background radiation brightness.
     从红外物理基本定律出发 ,结合空中光电侦察原理和地面背景温度起伏状况 ,提出了由工作波段内目标和背景的辐射亮度以及背景的辐射亮度起伏幅度来确定伪装网平均热红外透过率指标的方法
短句来源
     For the samples without conductive coating,the counting rates of NaK_αX-ray were higher and appeared fluctuating.
     未镀导电膜试样的NaK_αX射线计数率较高,且出现起伏
短句来源
     MUTUAL COHERENCE FUNCTION FOR LATERAL PULSE WAVE IN WEAK FLUCTUATING MEDIUM
     弱起伏介质中界面脉冲波的互相干函数
短句来源
     On the Periodicity of Sport Training and the Fluctuating Profiles of Athletic Performance
     论运动训练的周期性与竞技成绩起伏曲线——对我国110米栏奥运冠军刘翔2005年竞技成绩的评定
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  “fluctuating”译为未确定词的双语例句
     RANDOM CHARACTERISTICS OF FLOW FLUCTUATING PRESSURE AND DYNAMIC RESPONSE ON THE SHAFT SPILLWAY
     RANDOM CHARACTERISTICS OF FLOW FLUCTUATING PRESSURE AND DYNAMIC RESPONSE ON THE SHAFT SPILLWAY
短句来源
     The method was to soak the seed in 200mg/ml GA3 solution for 12 hours, then subject it to stratification treatment under fluctuating temperature, that is, high temperature (18~20℃ 12h ) alternating with low (0~4℃ 12h ), for 36 days.
     方法是将辽东楤木种子在200mg/kg的GA3水溶液中浸泡12h,然后在高温(18 ̄20℃12h)和低温(0 ̄4℃12h)下进行变温层积处理60d。
短句来源
     The device has a crosstalk below-28 dB and a return loss below-22 dB with the tilt angle of the slanted grating fluctuating from 2.5° to 4.5°.
     当斜光栅的倾斜角度在2.5°到4.5°之间时,器件的串扰低于-28 dB,回波损耗低于-22 dB。
短句来源
     The length of embryo extends from 0.2mm to 3.1mm with the fluctuating temperature treatments,the germination percentage reaches to 12.0%.
     变温处理使胚长由最初的0.2mm伸长到3.1mm,发芽率达到12.0%。
短句来源
     There was no difference in the fluctuating craving levels among the groups of one month, two months, three months, and over three months after clinical detoxification(F=1.345,P=0.259).
     临床脱毒后 ,一个月、二个月、三个月及三个月以上 ,渴求分值的变化没有显著性(F=1.345,P=0.259)。
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  fluctuating
The results show that centroids of burned areas in these three regions are in a fluctuating condition that encircles the distribution center.
      
The developmental stability indices, leaf width based fluctuating asymmetry (FA1), and lateral vein length based directional asymmetry (RDA1) of Platanus acerifolia were studied.
      
Fluctuations and patterns of desert rodent communities under human disturbance: fluctuating tendency and sensitive response of t
      
The fluctuating tendency of rodent communities and the sensitive response of their populations were studied using mark-recapture and trap-day methods.
      
Annual variation in hematological indices in a fluctuating population of bank vole (Clethrionomys glareolus)
      
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The present paper reports on the results of some preliminary observationson the insect parasites of the pine caterpillar, carried out in the Nanking dis-trict during 1936-37. (1) The following insect parasites were reared from various stages of thepine caterpillar: Egg parasites: Trichogramma evanescens Westwood, Telenomus dendrolimusiChu, Anastatus gastropachae Ashmead. Larva parasites: Casinaria dendrolimi Uchida, Rhogas spectabilis (Matsumura),Stenaraeoides octocinctus (Ashmead), Itoplectis nigribasalis Uchida,...

The present paper reports on the results of some preliminary observationson the insect parasites of the pine caterpillar, carried out in the Nanking dis-trict during 1936-37. (1) The following insect parasites were reared from various stages of thepine caterpillar: Egg parasites: Trichogramma evanescens Westwood, Telenomus dendrolimusiChu, Anastatus gastropachae Ashmead. Larva parasites: Casinaria dendrolimi Uchida, Rhogas spectabilis (Matsumura),Stenaraeoides octocinctus (Ashmead), Itoplectis nigribasalis Uchida, Tricholygasorbillans Wied., Sturmia sp., Carcelia sp. Pupal parasites: Xanthopimpla japonica Krieger, Pimpla disparis Viereck,Brachymaria obscurata (Walker), Brachymeria fiskei Crawford. Hyperparasites: Phygadeuon latipatiolator Uchida, Monodontomerus dentipes(Boheman), Brachymeria obscurata (Walker), Brachymeria fishei Crawford, Eury-toma sp. (2) The egg parasites played an important part in the natural control ofthe pine caterpillar. The percentage of parasitism reached 61% in the materialcollected at Tang-shan, 1936. Telenomus dendrolimusi and Anastatus gastropachaewere observed to be more important than Trichogramma evanescens. (3) As high as 26% of the early-instar larvae could be killed by the para-sites. The percentage of larval parasitism and the relative value of the severalparasites varied with the time at which host material was collected. A differ-ence of a few days would give entirely different results. (4) The late-instar larvae were attacked by three species of dipterousparasites. The highest percentage of parasitism observed was 42%. (5) 38.4% of the pine caterpillar were killed during their pre-papal andpupal stage chiefly by Sturmia sp. and Xanthopimpla japonica Krieger. (6) The percentage of parasitism whether in the egg, larva or pupa stagewere observed to be always higher in the second generation than in the first,a fact suggests that hibernation may have an important bearing upon thepopulation of the parasites. (7) The time of appearance of the more important parasites and theirhabits were discussed. (8) Some of the factors, such as hyperparasitism, non-synchronization ofthe life cycles of the host and parasite, over-restriction in host selection, andthe influence of certain control measures, which have adverse effects on theparasite populations, were discussed. (9) As the percentage of parasitisn fluctuated greatly with year and season,it, is, therefore, suggested that a study of the factors which are responsible forthese fluctuations is of primary importance. Based on the results of suchstudies, measures may be adopted to increase the efficiency of the parasites.

1936—37年在南京地区观察松毛虫寄生天敌所得的初步结果可简述如下: (一)南京地区业经发现的松毛虫天敌有卵寄生蜂3种:赤眼卵蜂、松毛虫长腹卵蜂、平腹小蜂;幼虫寄生蜂4种:松毛虫瘦姬蜂、松与虫红头小茧蜂、花胸姬蜂、黑基瘤姬蜂;幼虫寄生蝇3种:家蚕寄生蝇、大寄生蝇、小寄生蝇;蛹寄生蜂4种;日本黑点姬蜂、黑瘤姬蜂、大腿蜂、费氏大腿蜂;另重寄生8种。 (二)卵寄生蜂在防治松毛虫上起了适当大的作用,有时减低寄主虫口达61.24%。3种寄生蜂中以松与虫长腹卵蜂及平腹小峰为较重要。 (三)松毛虫初龄幼虫寄生率最高时可达26%。寄生率的高低及各种天敌的比较重要性与采集寄主材料的时期有密切的关系,往往数日之差,寄生率可截然不同。 (四)松与虫的后龄幼虫遭3种寄生蝇的寄生。寄生率最高可达42%。 (五)松毛虫茧期的寄生率可达38.4%,天敌中以大寄生蝇及日本黑点姬蜂为 最主要。 (六)无论在卵期、幼虫期或蛹期,第2化松毛虫的寄生率均比第1化的为高。此点似说明越冬问题是松毛虫天敌繁殖中的一个关系问题。 (七)几种比较重要的寄生天敌的发生时期和生活习性,本文中根据观察所及,加以记载。 (八)本文中将几个影响松毛虫寄生天敌虫口的因...

1936—37年在南京地区观察松毛虫寄生天敌所得的初步结果可简述如下: (一)南京地区业经发现的松毛虫天敌有卵寄生蜂3种:赤眼卵蜂、松毛虫长腹卵蜂、平腹小蜂;幼虫寄生蜂4种:松毛虫瘦姬蜂、松与虫红头小茧蜂、花胸姬蜂、黑基瘤姬蜂;幼虫寄生蝇3种:家蚕寄生蝇、大寄生蝇、小寄生蝇;蛹寄生蜂4种;日本黑点姬蜂、黑瘤姬蜂、大腿蜂、费氏大腿蜂;另重寄生8种。 (二)卵寄生蜂在防治松毛虫上起了适当大的作用,有时减低寄主虫口达61.24%。3种寄生蜂中以松与虫长腹卵蜂及平腹小峰为较重要。 (三)松毛虫初龄幼虫寄生率最高时可达26%。寄生率的高低及各种天敌的比较重要性与采集寄主材料的时期有密切的关系,往往数日之差,寄生率可截然不同。 (四)松与虫的后龄幼虫遭3种寄生蝇的寄生。寄生率最高可达42%。 (五)松毛虫茧期的寄生率可达38.4%,天敌中以大寄生蝇及日本黑点姬蜂为 最主要。 (六)无论在卵期、幼虫期或蛹期,第2化松毛虫的寄生率均比第1化的为高。此点似说明越冬问题是松毛虫天敌繁殖中的一个关系问题。 (七)几种比较重要的寄生天敌的发生时期和生活习性,本文中根据观察所及,加以记载。 (八)本文中将几个影响松毛虫寄生天敌虫口的因子提出讨论,这些因子包括;重寄生的严重、天敌发生时期与寄主生活史的不相

Sugar cane borers infest the cane and cause a considerable injury to the plant in China. Four species of sugar-cane borers are commonly found in Kwangtung Province, viz. Diatraea venosata Wk., Chilo infuscatellus Snellen, Eucosma schistaceana Snellen and Sesamia inferens Wk.Trichogramma evanescens Westw. occurs in nature as an egg parasite of the sugar-cane borers.The present experiment on breeding Trichogramma centres around the ways of increasing its viability.The quality and the quantity of the nutrient for...

Sugar cane borers infest the cane and cause a considerable injury to the plant in China. Four species of sugar-cane borers are commonly found in Kwangtung Province, viz. Diatraea venosata Wk., Chilo infuscatellus Snellen, Eucosma schistaceana Snellen and Sesamia inferens Wk.Trichogramma evanescens Westw. occurs in nature as an egg parasite of the sugar-cane borers.The present experiment on breeding Trichogramma centres around the ways of increasing its viability.The quality and the quantity of the nutrient for the larvae and adults of Trichogramma play an important role in relation to their viability. The contents of the egg of Sitotroga cerealella Oliv. which has been commonly used as a host of the Trichogramma are of poor nutrient quality and quantity for the larvae of this parasite. The eggs of Angoumois grain moth are so small that only one adult Trichogramma emerges from each egg. Such adults are usually smaller in size, less active and with lower reproductive potentiality as compared with those that emerge from the field hosts; besides, the female sex ratio gradually decreases in the successive generations.From the results of an experiment on Trichogramma breeding, it is found that the eggs of Attacus cynthia ricini Boisd. and of Dendrolimus sp. are the most suitable hosts for the propagation of Trichogramma evanescens. The adults of the parasites emerging from such eggs are generally large in size, very active and possess high reproductive potentiality; besides, the female sex ratio remains unchanged in the successive generations. Evidently, the quality and the quantity of the egg contents of these two species of insects fulfil the nutritional requirements for the development of the Trichogramma larvae and they are recommended as hosts for Trichogramma propagationThe average number of adult Trichogramma emerging from a single egg of Dendrolimus sp. and that of Attacus cynthia ricini is 27.3 and 28 respectively with the respective maximum reaching 52 and 59 in the present record. If too many adults emerge from a single egg, both their size and reproductive potentiality would decrease and, moreover, the number of the male individuals would increase and the adult life would shorten. Undoubtedly, all these features are unfavourable for the utilization of the parasites for control of the insect pest as far as the effectiveness of the parasites is concerned. From the standpoint of increasing viability of the parasite, regulation of the number of parasites in the egg during the procedure of propagation of Trichogramma is necessary. Regulation of the number of parasites in the egg means regulation of the quantity of the nutrient for the parasites. The method of checking the occurrence of superparasitism is to regulate the ratio of the number of female Trichogramma and host eggs to 1:1 through the procedure of propagation; the period of oviposition should not exceed one day.The quality of nutrient for adult Trichogramma greatly affects its longivity and reproductive potentiality. The result of a nutritional experiment shows that honey is the most suitable nutrient for it. The adults fed with honey have the longivity increased 8.6 times and the number of the offspring 14.7 times as compared with those fed with distilled water.Cold storage effectively reduces the speed of development of the immature stage of Trichogramma. The mature larvae about to pupate within the host eggs maintain their life for 57 days under 4—7℃ and all of them will come out as adults at room tempeature. The fresh eggs of Dendrolimus sp. and of Attacus cynthia ricini kept in cold storage of 0— 4℃ for 97 days and 61 days respectively are still usable for rearing Trichogramma.In order to increase the adaptability of Trichogramma to the environment of the sugarcane field, the rearing procedure is suggested to proceed in the field or in an indoor environment with fluctuating temperature and humidity. The continuous artificial rearing should not exceed five generations before the liberation of the parasites.The distance of dispersion of Trichogramma eva

甘蔗是我国最重要的糖料作物,甘蔗害虫以甘蔗螟虫最普遍,分怖亦最廣。廣东珠江三角洲常见的甘蔗螟虫共有四种:条螟或称斑点螟(Diatraea venosata Wk.)、二点螟(Chilo infuscatellus Snellen)、黄螟(Eucosma schistaceana Snellen)和大螟(Sesamiainferens Wk.)。甘蔗螟虫为害的结果,形成枯心苗和蛀(?),影响甘蔗生长发育,减低蔗糖成份,易受风折,而且造成甘蔗赤腐病菌入侵条件。 甘蔗螟虫的为害虽重,但目前还没有一套完整的防治方法,也还没有一种很有效的方法。本试验目的,是利用赤眼蜂来防治甘蔗螟虫。试验内容是赤眼蜂的寄主的选择和繁殖、赤眼蜂的繁殖及保存、赤眼蜂田间放播初步试验和甘蔗螟虫田间发生情况的调查。现将各项试验结果简要地分述如下: 赤眼蜂能否利用成功,要看培育出来的赤眼蜂是否具有高度的生活力。赤眼蜂的生活力可用下列四个标准去量度:(1)蜂体大小,(2)繁殖能力,(3)成虫寿命,(4)对田间环境的適应性。此外,繁殖出来的赤眼蜂雌性此率不应此自然界的减低。 赤眼蜂的生活力,首先和寄主有很大关系。如果寄主卵的内含物的质和量都適合 於赤...

甘蔗是我国最重要的糖料作物,甘蔗害虫以甘蔗螟虫最普遍,分怖亦最廣。廣东珠江三角洲常见的甘蔗螟虫共有四种:条螟或称斑点螟(Diatraea venosata Wk.)、二点螟(Chilo infuscatellus Snellen)、黄螟(Eucosma schistaceana Snellen)和大螟(Sesamiainferens Wk.)。甘蔗螟虫为害的结果,形成枯心苗和蛀(?),影响甘蔗生长发育,减低蔗糖成份,易受风折,而且造成甘蔗赤腐病菌入侵条件。 甘蔗螟虫的为害虽重,但目前还没有一套完整的防治方法,也还没有一种很有效的方法。本试验目的,是利用赤眼蜂来防治甘蔗螟虫。试验内容是赤眼蜂的寄主的选择和繁殖、赤眼蜂的繁殖及保存、赤眼蜂田间放播初步试验和甘蔗螟虫田间发生情况的调查。现将各项试验结果简要地分述如下: 赤眼蜂能否利用成功,要看培育出来的赤眼蜂是否具有高度的生活力。赤眼蜂的生活力可用下列四个标准去量度:(1)蜂体大小,(2)繁殖能力,(3)成虫寿命,(4)对田间环境的適应性。此外,繁殖出来的赤眼蜂雌性此率不应此自然界的减低。 赤眼蜂的生活力,首先和寄主有很大关系。如果寄主卵的内含物的质和量都適合 於赤眼蜂幼虫营养之需,羽化出来的成虫体积大,繁殖力强,寿命也有延长的趣势。关於赤眼蜂的寄主,我们管用过17种鳞翅目昆虫的卵供其寄生,结果以松毛虫(Dendro

A disease which caused heavy losses in the stored Ralls apples in the South Laoning area in the Spring of 1955 has Leen named"Hoo-pee" By the apple growers. A Study was made from 1955 to 1957 to determine the affected factors and to find out the controlling methods.The results are summarized as follows: 1.The accumulated data of the two years experiments indicate that the date of harvest has much to do with the development of the disease, the early-picked fruits de eloping more abundantly and more severely than...

A disease which caused heavy losses in the stored Ralls apples in the South Laoning area in the Spring of 1955 has Leen named"Hoo-pee" By the apple growers. A Study was made from 1955 to 1957 to determine the affected factors and to find out the controlling methods.The results are summarized as follows: 1.The accumulated data of the two years experiments indicate that the date of harvest has much to do with the development of the disease, the early-picked fruits de eloping more abundantly and more severely than the latepicked fruits.The effect of delaying the har est on the reduction of the diseaseproducing rate is that: (1)the packing treatment with paraffin oil paper is found to be more pronounced than other treatments including the consrol; (2) low temperature ranging from 0—3℃ is more pronounced than high temperature raving from 3—6℃ in the latter period of storage. 2.Taking alsolute value for consideration, Truits are more susceptible to the dicease at higher temperature than at lower temperature in the latter period of Storage, the stimulating effect of high temperature on the disease beingmore pronounced for the lare-picked fruits than for the early-picked ones, and the control being likely to be more pronounced than the other treatments. 3.Among the packing treatments, paraffin oil paper packing treatment is found to cause the least infection.Its effect on reducing the disease for the late-picked fruits is more pronounced than for the early-picked ones, and high temperature is more pronounced than on low temperature The castor oil paper packing turns out to Le almost of no effect, moreover, it has the tendency of stimulating the decelopment of the disease.The rice hull packing treatment causes in part slighter infection and in part heavier than the Control in the first year, whereas in the second year, it is generally slighter than the control; in the latter season hewever, the reducing rate tends to be more pronounced at low temperature than at high temperature,and the same is true for the latepicked fruits than for the early-picked ones.The effect of the ordinary paper wrapping treatment is found to lesimilar to tlat of rice hull packing treatment. 4.In the former period of storage the alove mentloned treatments cause very shight and almost no sign of disease, whereas, in the latter period, the di(?)ease is found to develop rapidly, the transition time leing approximately on the first decade of Marcl for the eary-pcled fruit, and at the end of the same month for the late-picked ones. 5.Storing in fluctuating room temperatures at relatively low relative humidity, the results turn out to be different from those mentioned above.In the first year at comparatively high temperature,fluctuating between 10—23℃ every day, the disease is almost absent for the early-picked fruits up to the end of February, while in the seconl year,when the temperature is comparatively low, fluctuating letween 2—10℃ every day, quite an amount of fruits infected with the disease on the middle of March particularly for the early-piced fruits. Hovever, the final and total disease-producing rate is low as compared with the ordinary storage temperatures. 6.Transfering suddenly from cold storagee to the orbinary room temperature,the rate of disease occurence swiftly increases.After several days for the earlypicked fruits and a little more than ten days for the late-picked fruits, the results far outgo those of the cold storage as well as of those of the room temperatures. 7.Exposing the fruits to such volatile materials as ethyl acetate, amyl acetate an acetaldehyde and continuing in the storage before and after treatment, the results are rather irregular, altho the disease-developing rate of some treated fruits is lower than the control, This may be due to lack of materials for.experiments and uneven ripening of the fruits 8.Observations show that the striking effect of the coloration of the fruits on the disease is established but the size of the fruits does not show any appreciable difference in infection. 9.The tentative results lead to a conclution that the"Hoo-pee" of Ralls apples is truely the Scald, but the results of treatments with rice hull and paper wrappings do not correlate with the explanations given by some workers concerning the causes of scald since there is a condition of poor aeration in these treatments.

1.两年的试验一致显示采收期对国光蘋果虎皮病有非常显著的影响,早采收的远比晚采收的发病既多且重。延迟采收对降低发病率的效果在不同包装处理及不同后期贮藏温度之间有些不同,在石腊油纸处理比其他包装处理及对照更显著,贮藏后期温度低的(0—3℃)比温度高的(3—6℃)显著。 2.贮藏后期温度升高,发病率也就增加。温度升高对促进发病率的影响程度,在晚采果比早采果显著,在封照组似乎比其他包装处理为显著。 3.在各种包装处理中,以石腊油纸处理的发病最低。石腊油纸降低发病率的功效在晚期果比早期果显著,在后期贮藏高温比低温显著。蓖麻油纸处理似乎无效甚至还有促进发病的趋势。稻壳填箱处理的发病率在第一年有的比对照高,有的比对照低;第二年一致低于对照组,并且其发病率降低的程度在晚采果比早采果显著,在贮藏后期低温比高温显著。果实包纸处理的结果基本上与稻壳处理相仿。 4.上列各种处理的蘋果在贮藏前期很少发病或不发病,贮藏后期则急速增加。这种转变期在早采果大约为3月上旬,晚采果要更延迟些。 5.贮藏在不断变动的室温中(相对湿度较低)的蘋果与上述情况不同,第一年(温度较高,每天在10—23℃之间变动)早采果到2月底尚无病;第二年(温度较低每...

1.两年的试验一致显示采收期对国光蘋果虎皮病有非常显著的影响,早采收的远比晚采收的发病既多且重。延迟采收对降低发病率的效果在不同包装处理及不同后期贮藏温度之间有些不同,在石腊油纸处理比其他包装处理及对照更显著,贮藏后期温度低的(0—3℃)比温度高的(3—6℃)显著。 2.贮藏后期温度升高,发病率也就增加。温度升高对促进发病率的影响程度,在晚采果比早采果显著,在封照组似乎比其他包装处理为显著。 3.在各种包装处理中,以石腊油纸处理的发病最低。石腊油纸降低发病率的功效在晚期果比早期果显著,在后期贮藏高温比低温显著。蓖麻油纸处理似乎无效甚至还有促进发病的趋势。稻壳填箱处理的发病率在第一年有的比对照高,有的比对照低;第二年一致低于对照组,并且其发病率降低的程度在晚采果比早采果显著,在贮藏后期低温比高温显著。果实包纸处理的结果基本上与稻壳处理相仿。 4.上列各种处理的蘋果在贮藏前期很少发病或不发病,贮藏后期则急速增加。这种转变期在早采果大约为3月上旬,晚采果要更延迟些。 5.贮藏在不断变动的室温中(相对湿度较低)的蘋果与上述情况不同,第一年(温度较高,每天在10—23℃之间变动)早采果到2月底尚无病;第二年(温度较低每天在2—10℃之间变动)到3月中已有相当数量的病果,特别是早采收的;但最后的总发病率却比贮藏后期高温的甚至比低温的还要低。 6.蘋果从贮藏室骤然移入室温中,发病率急速上升,数日内(早采果)至10余日内(晚采果)便远远超过冷藏或室温贮藏的同类果实。 7.应用某些挥发性物质处理蘋果,找不到什么有规则的结果,很多处理组的发病率甚至比对照组还要低,这可能是试验的果实太少及果实成熟度不很一致所致。 8.观察和计算肯定了着色程度同病变的关系。果实大小同病变的关系不显著。 9.从试验结果可以确定国光蘋果的虎皮病就是果皮褐变,但稻壳和包纸处理的结果与某些学者对果皮褐变原因的见介不相符合,因为这些处理的通气情况是不好的。

 
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