1,721,003 research outputs found
(6(4):41-57)A FIELD SURVEY OF THE POPULATION DENSITY OF THE PINEAPPLE MEALYBTJG AND RED-MITE IN FORMOSA (Taiwan)
No full text鳳梨粉介殼蟲(Dysmicoccus brevipis CKll.)及鳳梨赤蝨(Stigmaeus flouridanus Banks)為鳳梨之主要害蟲，蔓延廣泛，為害甚烈，頗為一般人所重視，蓋因鳳梨粉介殼蟲能傳播毒素，引起鳳梨急性萎凋病之發生，而鳳梨赤蝨與急性萎凋病之關係，雖尚無定論，然因其寄生，而致生長不良，似可斷言。筆者等為明瞭其分佈情形及發生實況，藉為防治之根據，特作一較為精密而廣泛之實地調查，自41年4月24日至5月29日，歷時一月有餘。茲將調查所得，報告於後，以供同道者之參考。
As in other parts of the world, the mealybug (Dysmicoccus brevies Ckll.) and red-mite (Stigmaeus floidanus Banks) constitute the commonest and most important pests of pineapple in Formosa. In April 24 to May 29, 1952, inclusive, an intensive field survey of these two pests was made at 11 cultivating centers in southern and central parts of this island. Totally 28 plots (517 plants) representing different environmental conditions were sampled at random and immediately following this, the actual number of mealybug adults and nymphs on different parts of the plants were counted. The population density of the red-mite, however, was figured out by measuring the area infested and only five outer most leaves of each plant were examined.
The result of this survey revealed that 57.64% of the plants were infested by mealybugs and each plant harboured, in average, 35.71 such insects. Of 18.462 mealybugs thus sampled, 34.50% were found on leaf-bases, 32.59% on root system, 14.04% on fruits, 8.35% on fruit-pedicels and 8.18% on slip. In general, the population density was significantly lower where the seedlings have been fumigated prior to transplantation, and where the slope of the pineapple field was facing west (rather than facing south).
In the case of the red-mite, 80.41% of the plants were found to be infested and the infested area on each plant is 316 sq. mm. in average. Its population density seems, on the other hand, more or less correlated with soil humidity
(27(4):315-324)Effects of phosphorus and potassium levels and plant spacing on the yield and protein content of Dioscorea alata L.
No full text為了探討磷鉀肥施用量與栽植行距對山藥塊根產量及蛋百質含量之影響，乃舉行木研究。供試材料為山藥(Dfoscorea alata L.)，分磷鉀肥施用量試驗，兩因子磷及鉀，各三平準(0, 50, 100kg/ha)共有9種處理，及不同行距密度試驗，共有4種行距(60, 80, 100, 120cm)處理二部份。此將研究結果摘述如下：
1. 肥料以每公頃施用磷肥50kg及鉀肥100kg(P1K2處理)可增加地上部莖葉乾重量，每公頃平均比P0K0處理，可增加315kg；且對地下部之塊根收量也可增加，平均每公頃可增加9,963kg；由於鉀磷肥均有利於塊根之肥大，故收量有顯著增加。
2. 在每公頃施用磷肥50kg及鉀肥100kg（P1K2處理）之下較不施磷鉀肥者(P0K0)蛋白質含量提高3.3%，因而品質大為提高。
3. 種植行距為60cm時收穫最佳，對地下部塊根收量每公頃比120cm者可增加6,164kg。行距為80cm時比120cm者每公頃可增收5,485kg,，且可提高塊根之蛋白質含量3.27%，行距120cm處理者結果相反，其蛋白質含量有降低之趨勢。為增收塊根且兼顧蛋白質含量時則以種植行距80cm最佳。
The present experiments were aimed at studying the effects of different levels of phosphorus (P) and potassium (K) fertilizers as well as different planting densities on the yield and protein content of Dioscorea alata L. a popular medicinal plant.
1. When 50 kg of P and 100kg of K fertilizers were added to the normal level of nitrogen fertilizer (50kg/ha), a marked increase in tuberous roots was observed up to 9,963 kg per hectare and also for dry weight of stem and leaves up to 315 kg per hectare in comparison with those without P and K application.
2. The protein content of tuberous root in the P. and K. applied plot increased 3.3% point in comparison with that of without P. and K. application.
3. It was observed that at 60 cm and 80 cm of spacing between rows resulted in an increase of 6,6164 kg and 5,485 kg per hectare of tuberous root respectively, in comparison of 120 cm spaced plot. Further, protein content was found to be 3.27% point higher in 80 cm spaced plot than that of 120cm spaced plot
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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