Multicompartment analysis of the response of lupin hypocotyl segments to the addition and removal of indolyl-3-acetic acid

1972 ◽  
Vol 50 (10) ◽  
pp. 2015-2026 ◽  
Author(s):  
David Penny
Keyword(s):  
Experimental Study ◽  
Growth Rate ◽  
Computer Simulation ◽  
Experimental Results ◽  
The Other ◽  
Allosteric Activation ◽  
Transport Delay ◽  
Different Parts ◽  
Two Alternatives ◽  
Hypocotyl Segments

The typical growth rate curve of the response of lupin hypocotyl to auxin is discussed and explanations suggested for the different parts of the curve. Two alternatives are shown to be able to account for the latent period after auxin addition. One is a linear series of compartments with the transport between compartments similar to allosteric activation in enzyme kinetics and the other alternative is an unmixed compartment (transport delay). Computer simulation is used to test different models to determine whether any model quantitatively predicts the observed results. An example (and variations) of a model is given that predicts much of the experimental results. The model is tested under different conditions such as the addition of different concentrations of auxin, and different times of cycloheximide pretreatment, and on removal from different auxin concentrations. The results of the computer simulations are then compared with experimental results and the model improved to overcome discrepancies. The usefulness of computer simulation in an experimental study is discussed.

Study of wave attenuation in concrete

1993 ◽  
Vol 8 (9) ◽  
pp. 2344-2353 ◽  
Author(s):  
J-M. Berthelot ◽  
Souda M. Ben ◽  
J.L. Robert
Keyword(s):  
Experimental Study ◽  
Plane Wave ◽  
Wave Attenuation ◽  
Plane Waves ◽  
Propagation Distance ◽  
Experimental Results ◽  
The Other ◽  
Wave Frequency ◽  
Concrete Composition ◽  
Analytical Expression

The experimental study of wave attenuation in concrete has been achieved in the case of the propagation of plane waves in concrete rods. Different mortars and concretes have been investigated. A transmitter transducer coupled to one of the ends of the concrete rod generates the propagation of a plane wave in the rod. The receiver transducer, similar to the previous one, is coupled to the other end of the rod. The experimental results lead to an analytical expression for wave attenuation as function of the concrete composition, the propagation distance, and the wave frequency.

Quantitative anatomical studies of the composition of the pig at 50, 68 and 92 kg. carcass weight II. Gross composition and skeletal composition

1962 ◽  
Vol 59 (2) ◽  
pp. 215-223 ◽  
Author(s):  
A. Cuthbertson ◽  
R. W. Pomeroy
Keyword(s):  
Growth Rate ◽  
Cervical Vertebrae ◽  
The Other ◽  
Carcass Weight ◽  
Anatomical Studies ◽  
Pig Carcasses ◽  
Rates Of Growth ◽  
Second Period ◽  
Different Parts

1. Results are presented concerning the gross composition of pig carcasses at 50, 68 and 92 kg. carcass weight in ten litters. They show that during the periods under consideration the proportion of muscle in the carcass exceeded that of the other tissues. However, while the rates of growth of muscle and bone were similar the growth rate of fat was markedly greater. The result was that at 92 kg. the proportions of muscle and fat in the carcass were 43·53 and 41·37%, respectively.2. Results are also presented dealing with the relative development of the different parts of the skeleton. Of the five major anatomical regions of the skeleton the sacrum grew relatively fastest between 50 and 68 kg. carcass weight while the cervical vertebrae grew fastest in the second period. In both periods the bones of the thorax and loin grew at rates intermediate between the fastest and slowest growing regions.

scholarly journals A new study of Brazilian concrete strength conformance

2017 ◽  
Vol 10 (4) ◽  
pp. 906-923 ◽  
Author(s):  
W.C. Santiago ◽  
A.T. Beck
Keyword(s):  
Concrete Strength ◽  
Experimental Results ◽  
The Other ◽  
Significant Part ◽  
The South ◽  
Characteristic Strength ◽  
Different Parts

ABSTRACT This paper presents a new evaluation of the strength compliance of concretes produced in Brazil. It is based on experimental results of over twenty-seven thousand concrete samples from different parts of the country. Results show that a significant part of Brazilian concrete do not reach the characteristic strength (fck) specified in design, and the percentage of nonconforming samples tend to be higher than 5%. This study also reveals the concrete produced in the South and Midwest regions have less variability than the ones produced in the other regions of the country. These results emphasize the importance of a rigorous control in manufacturing and reception of concretes in order to reduce the nonconforming cases.

Simulation of reciprocating gas compressors with automatic reed valves

SIMULATION ◽  
1967 ◽  
Vol 8 (4) ◽  
pp. 209-214 ◽  
Author(s):  
M.W. Wambsganss ◽  
Donald Coates ◽  
Raymond Cohen
Keyword(s):  
Mathematical Model ◽  
Computer Simulation ◽  
Steady State ◽  
Dynamic Behavior ◽  
High Speed ◽  
Experimental Results ◽  
The Other ◽  
Reciprocating Compressor ◽  
Trial And Error ◽  
State Tests

The simulation of high-speed reciprocating refrigeration compressors was motivated by the needs of design engi neers. In this paper a mathematical model describing the dynamic behavior of a reciprocating compressor is pre sented. The model is semianalytic in that two types of empirical factors are required to relate phenomena not yet analytically predictable. One type is obtained from steady- state tests and the other by trial and error based on com parison with experimental results. Both analog and digital computers were considered as means of simulating the model. Due to nonlinearities in the model, the digital com puter, using Fortran IV, was selected. To evaluate the sim ulation, a one-quarter horsepower 3600-rpm stock com pressor was modified and used as a laboratory vehicle. A typical correlation between the computer simulation and experimental results is given. In general, good correlation was achieved.

scholarly journals Experimental Archaeology Study on the Drilling Techniques of Neolithic Stone Bracelet from Purbalingga

KALPATARU ◽  
2021 ◽  
Vol 30 (2) ◽  
pp. 153-166
Author(s):  
Priyatno Hadi Sulistyarto ◽  
Lilin Kumala Pratiwi ◽  
Aldhi Wahyu Pratama ◽  
Salma Fitri Kusumastuti ◽  
Indah Asikin Nurani ◽  
...  
Keyword(s):  
Experimental Study ◽  
Quartz Sand ◽  
Experimental Results ◽  
The Other ◽  
Natural Stone ◽  
River Sand ◽  
The North ◽  
Central Java ◽  
Drill Bits ◽  
Materials Used

Abstract. The stone bracelet is a neolithic artifact crafted by drilling techniques. Traces of stone bracelet workshop activities in Central Java were found in Purbalingga, which is spread across the North Serayu Mountains between Kali Tungtunggunung and Kali Laban. This study is based on the previous research hypothesis, which states that the manufacture of stone bracelets is carried out by drilling techniques using bamboo wulung (Gigantochloa atroviolacea). This study aims to prove this hypothesis. An experimental archaeological approach by conducting drilling experiments using several drill bits: iron drills, masonry/concrete iron drills, iron drills for natural stone, and bamboo drills. Meanwhile, the abrasive materials used are water, river sand, and quartz sand. The analysis was carried out by comparing the morphological and morphometric traces of the workings between artifacts and experimental results, based on microscopic observations with a magnification of 20x to 200x. Compared to the other drilling bits and abrasive materials, the experimental study revealed that bamboo drill bits, with quartz-sand and water as additional gritty material, showed the closest similarity.

An Experimental Study of Drilling Parameters Effect on Composite Carbon/Epoxy Damage

2013 ◽  
Vol 554-557 ◽  
pp. 2038-2046 ◽  
Author(s):  
Yosra Turki ◽  
Malek Habak ◽  
Raphael Velasco ◽  
Jean Noel Laurent ◽  
Pascal Vantomme
Keyword(s):  
Experimental Study ◽  
Composite Materials ◽  
Epoxy Composite ◽  
Cutting Speed ◽  
Experimental Results ◽  
Delamination Factor ◽  
Drilling Parameters ◽  
Thrust Forces ◽  
Composite Carbon ◽  
Different Parts

The main purpose of composite materials drilling is the need to put together different parts of a structure, in aeronautics for example. The objective of this study is to experimentally analyze the influence of drilling on a carbon/epoxy composite. Three geometries of drill, a range of cutting speed and feed have been tested. Thrust forces and moments have been recorded during machining and macroscopic analyses have been conducted to examine outside and inside surfaces of the holes. Damages have been also quantified using delamination factor Fd. Experimental results have shown significant influences of feed and drill geometry on delamination and the best results have been obtained using a spur drill.

scholarly journals Against intentionalism: an experimental study on demonstrative reference

2021 ◽  
Author(s):  
Wojciech Rostworowski ◽  
Katarzyna Kuś ◽  
Bartosz Maćkiewicz
Keyword(s):  
Experimental Study ◽  
Philosophy Of Language ◽  
Hybrid Approach ◽  
Experimental Studies ◽  
External Factors ◽  
Experimental Results ◽  
The Other ◽  
Complex Demonstratives ◽  
Descriptive Content ◽  
Demonstrative Reference

AbstractIn this paper, we present two experimental studies on reference of complex demonstratives. The results of our experiments challenge the dominant view in philosophy of language, according to which demonstrative reference is determined by the speaker's intentions. The first experiment shows that in a context where there are two candidates for the referent—one determined by the speaker’s intention, the other by some “external” factors—people prefer to identify the referent of a demonstrative with the latter object. The external factors for which this prediction has been confirmed include the speaker’s demonstration and the descriptive content of a demonstrative. The second experiment shows that while this preference can be explained in terms of the speakers’ having different sorts of referential intentions, the relevant kind of intentions are fully opaque to the subjects. At the end of our paper, we point to some alternative accounts of demonstrative reference, including a pluralistic and hybrid approach, which can accommodate our experimental results.

The Influence of Water Regime on the Performance of Aquatic Plants

1994 ◽  
Vol 29 (4) ◽  
pp. 127-132 ◽  
Author(s):  
Naomi Rea ◽  
George G. Ganf
Keyword(s):  
Deep Water ◽  
Aquatic Plants ◽  
Water Regime ◽  
Optimal Performance ◽  
Experimental Results ◽  
The Other ◽  
Full Potential ◽  
Influence Of Water ◽  
Emergent Species

Experimental results demonstrate bow small differences in depth and water regime have a significant affect on the accumulation and allocation of nutrients and biomass. Because the performance of aquatic plants depends on these factors, an understanding of their influence is essential to ensure that systems function at their full potential. The responses differed for two emergent species, indicating that within this morphological category, optimal performance will fall at different locations across a depth or water regime gradient. The performance of one species was unaffected by growth in mixture, whereas the other performed better in deep water and worse in shallow.

Status of Family Fissidentaceae in Gujarat

2016 ◽  
Vol 1 (1) ◽  
Author(s):  
D.G. Shah ◽  
D.N. Mehta ◽  
R.V. Gujar
Keyword(s):  
Distinct Species ◽  
The State ◽  
The Other ◽  
Land Plants ◽  
Reproductive Structures ◽  
The Family ◽  
The Status ◽  
Vegetative Characters ◽  
First Time ◽  
Different Parts

Bryophytes are the second largest group of land plants and are also known as the amphibians of the plant kingdom. 67 species of bryophytes have been reported from select locations across the state of Gujrat. The status of family fissidentaceae which is a large moss family is being presented in this paper. Globally the family consists of 10 genera but only one genus, Fissidens Hedw. has been collected from Gujarat. Fissidens is characterized by a unique leaf structure and shows the presence of three distinct lamina, the dorsal, the ventral and the vaginant lamina. A total of 8 species of Fissidens have been reported from the state based on vegetative characters as no sporophyte stages were collected earlier. Species reported from the neighboring states also showed the absence of sporophytes. The identification of different species was difficult due to substantial overlap in vegetative characters. Hence a detailed study on the diversity of members of Fissidentaceae in Gujarat was carried out between November 2013 and February 2015. In present study 8 distinct species of Fissidens have been collected from different parts of the state. Three species Fissidens splachnobryoides Broth., Fissidens zollingerii Mont. and Fissidens curvato-involutus Dixon. have been identified while the other five are still to be identified. Fissidens zollingerii Mont. and Fissidens xiphoides M. Fleisch., which have been reported as distinct species are actually synonyms according to TROPICOS database. The presence of sexual reproductive structures and sporophytes for several Fissidens species are also being reported for the first time from the state.

Growth and Performance of Agriculture Sector in India

2015 ◽  
Vol 3 (2) ◽  
Author(s):  
Naresh Singla ◽  
Mamandeep Kaur
Keyword(s):  
Growth Rate ◽  
Capital Formation ◽  
The Other ◽  
Agricultural Credit ◽  
Agricultural Growth ◽  
Indian Economy ◽  
Agriculture Sector ◽  
Food Grain ◽  
And Performance ◽  
Agricultural Labourers

The growth of agriculture and allied sectors is critical for the Indian economy as about 49 percent of the population is directly or indirectly dependent on agriculture. During the last decade and so, the agriculture sector has undergone profound changes resulting in sharp deceleration in its growth. The study has attempted to analyze growth and performance of the agriculture sector in India since 1980-81 and tries to comprehend some of the factors responsible for the deceleration in growth. The study has shown that agriculture sector has been able to show tremendous improvement in expansion of area and production of food grain and non-food grain crops. However, there are so many underlying factors responsible for slowdown of the agricultural growth. Some of the factors identified include: Increase in area under non-agriculture uses, excessive dependence on rain fed farming, increase in number of agricultural labourers, reducing size of the operation holdings, over use of agri-inputs, inequity in the distribution of agriculture credit along with sharp deceleration in public gross capital formation in agriculture etc. The study pointed in order to achieve higher growth rate, there is a need to enhance the gross capital formation in agriculture sector particularly on irrigation so that more area can be brought under assured irrigation. Bringing equity in distribution of agricultural credit coupled with judicious and need-based agricultural inputs are some of the other recommendations drawn based upon the study.

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