Studies on frost injury to wheat. IV.* Freezing of ears after emergence from the leaf sheath

1974 ◽  
Vol 25 (5) ◽  
pp. 679 ◽  
Author(s):  
WV Single ◽  
H Marcellos
Keyword(s):  
Leaf Sheath ◽  
Ice Nucleation ◽  
Internal Factors ◽  
Freeze Resistance ◽  
Ear Development ◽  
Ice Nuclei ◽  
Frost Injury ◽  
Polyethylene Bags ◽  
Wax Coating ◽  
Internal And External Factors

Internal and external factors which may influence the survival of emerged wheat ears during radiation frost were examined by a number of experiments in a freezing chamber. Hardening, stage of ear development, supercooling and cultivar were the internal factors studied in ears protected from external ice nucleation by enclosure within polyethylene bags. Neither hardening nor stage of ear development had any effect on freeze resistance. Spikelet survival was unaffected by supercooling. Variation in internal ear resistance was revealed among 16 cultivars frozen at –3.9°C. Removal of the cuticular wax coating over the unprotected ear reduced its ability to survive at –3°C in an atmosphere abundant in ice nuclei. This supports the proposal that hydrophobic wax coatings may be important in the field in protecting floral parts from external ice nucleation. The implications of these findings with respect to frost resistance in the field are discussed. _____________________ *Part III, Aust. J. Agric. Res., 17: 601 (1966).

STRATEGI MENINGKATKAN LOYALITAS KONSUMEN MAKANAN KHAS KOTA CURUP KABUPATEN REJANG LEBONG

2019 ◽  
Author(s):  
Onsardi Onsardi
Keyword(s):  
Swot Analysis ◽  
Raw Materials ◽  
External Factors ◽  
Consumer Loyalty ◽  
Internal Factors ◽  
The Public ◽  
Typical Food ◽  
Internal And External Factors

The title of this study is the Strategy of Increasing Consumer Food Loyalty in CurupCity, Rejang Lebong Regency (Case Study in "Henvian" Typical Food Industry). Thisresearch is based on the importance of strategies in increasing business and consumerloyalty to products sold.Strategies to increase business and consumer loyalty can bedone with a SWOT analysis. Place of this research is the "Henvian" shop that sellstypical Rejang lebong food. The method used in this study is descriptive qualitative.Informants in this study were people who were considered to know for certain about theHENVIAN Specialty Food Store in Curup City, Rejang Lebong Regency. The dataanalysis technique used in this study is a SWOT analysis to determine the strengths,weaknesses, opportunities and threats in a typical Rejang Lebong food business.By using SWOT analysis techniques that consist of strengths (weakness), weaknesses(weakness), opportunities (opportnity) and threats (threath). The results of this studycan be concluded that the internal factors that are the strength of the marketing strategyare the quality of the product that is good at a price affordable to the public andtourists, service that is friendly and responsive to consumer needs, as well astechnological advancements that facilitate the promotion of business. Internal factorsthat are a weakness are often lack of stock, there are some products that do not meet thestandard packaging, the product shelf life is short, employees do not use uniforms.External factors that become opportunities are a fairly high economic community,abundant raw materials while external factors that are a threat are the manycompetitors, an unstable economy, the price of basic needs increases. Based on theresults of the SWOT analysis of internal and external factors, the strategy used is toimprove product quality by improving the appearance of packaging and quality ofcontent and quality of service by providing uniforms to employees and providingstandards of service to consumers. .Keywords: Strategy, Consumer Loyalty, SWOT

scholarly journals Cloud icing by mineral dust and impacts to aviation safety

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Slobodan Nickovic ◽  
Bojan Cvetkovic ◽  
Slavko Petković ◽  
Vassilis Amiridis ◽  
Goran Pejanović ◽  
...  
Keyword(s):  
Mineral Dust ◽  
Weather Conditions ◽  
Ice Nucleation ◽  
Aircraft Accidents ◽  
Ice Nuclei ◽  
Loss And Damage ◽  
Cloud Ice ◽  
Convective Weather ◽  
First Time ◽  
Engine Power

AbstractIce particles in high-altitude cold clouds can obstruct aircraft functioning. Over the last 20 years, there have been more than 150 recorded cases with engine power-loss and damage caused by tiny cloud ice crystals, which are difficult to detect with aircraft radars. Herein, we examine two aircraft accidents for which icing linked to convective weather conditions has been officially reported as the most likely reason for catastrophic consequences. We analyze whether desert mineral dust, known to be very efficient ice nuclei and present along both aircraft routes, could further augment the icing process. Using numerical simulations performed by a coupled atmosphere-dust model with an included parameterization for ice nucleation triggered by dust aerosols, we show that the predicted ice particle number sharply increases at approximate locations and times of accidents where desert dust was brought by convective circulation to the upper troposphere. We propose a new icing parameter which, unlike existing icing indices, for the first time includes in its calculation the predicted dust concentration. This study opens up the opportunity to use integrated atmospheric-dust forecasts as warnings for ice formation enhanced by mineral dust presence.

scholarly journals Condensed-phase biogenic–anthropogenic interactions with implications for cold cloud formation

2017 ◽  
Vol 200 ◽  
pp. 165-194 ◽  
Author(s):  
Joseph C. Charnawskas ◽  
Peter A. Alpert ◽  
Andrew T. Lambe ◽  
Thomas Berkemeier ◽  
Rachel E. O’Brien ◽  
...  
Keyword(s):  
Freezing Temperature ◽  
Organic Aerosol ◽  
Ice Nucleation ◽  
Mixed Phase ◽  
Cloud Formation ◽  
Fossil Fuel Combustion ◽  
Soot Particles ◽  
Ice Nuclei ◽  
Deliquescence Relative Humidity ◽  
Homogeneous Freezing

Anthropogenic and biogenic gas emissions contribute to the formation of secondary organic aerosol (SOA). When present, soot particles from fossil fuel combustion can acquire a coating of SOA. We investigate SOA–soot biogenic–anthropogenic interactions and their impact on ice nucleation in relation to the particles’ organic phase state. SOA particles were generated from the OH oxidation of naphthalene, α-pinene, longifolene, or isoprene, with or without the presence of sulfate or soot particles. Corresponding particle glass transition (Tg) and full deliquescence relative humidity (FDRH) were estimated using a numerical diffusion model. Longifolene SOA particles are solid-like and all biogenic SOA sulfate mixtures exhibit a core–shell configuration (i.e.a sulfate-rich core coated with SOA). Biogenic SOA with or without sulfate formed ice at conditions expected for homogeneous ice nucleation, in agreement with respectiveTgand FDRH. α-pinene SOA coated soot particles nucleated ice above the homogeneous freezing temperature with soot acting as ice nuclei (IN). At lower temperatures the α-pinene SOA coating can be semisolid, inducing ice nucleation. Naphthalene SOA coated soot particles acted as ice nuclei above and below the homogeneous freezing limit, which can be explained by the presence of a highly viscous SOA phase. Our results suggest that biogenic SOA does not play a significant role in mixed-phase cloud formation and the presence of sulfate renders this even less likely. However, anthropogenic SOA may have an enhancing effect on cloud glaciation under mixed-phase and cirrus cloud conditions compared to biogenic SOA that dominate during pre-industrial times or in pristine areas.

FAKTOR-FAKTOR YANG MEMPENGARUHI MINAT BERWIRAUSAHA MAHASISWA STAI MUHAMMADIYAH TULUNGAGUNG

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Mendah Nur Kumala ◽  
Mei Santi ◽  
Hasan Sultoni
Keyword(s):  
Family Environment ◽  
Sampling Technique ◽  
Self Esteem ◽  
External Factors ◽  
Test Reliability ◽  
Primary Data ◽  
Internal Factors ◽  
Surrounding Environment ◽  
Environment Education ◽  
Internal And External Factors

One alternative to reduce the unemployment rate in Indonesia is to foster entrepreneurship in college students because this is expected to be an educated young entrepreneur who is able to start his own business, and be able to open up jobs for others. The formulation of the problem include: what are internal factors (income, self-esteem, motivation) and whether external factors (family environment, surrounding environment, education, and opportunities) influence the interest in entrepreneurship of STAI Muhammadiyah Tulungagung students ?. This study aims to determine internal factors (income, self-esteem, motivation) and external factors (family environment, surrounding environment, education, and opportunities) affect the entrepreneurial interest of STAI Muhammadiyah Tulungagung students. The approach used is a quantitative approach to the type of associative research. The population and sample in this study were students of STAI Muhammadiyah Tulungagung which consisted of 50 students who had taken Entrepreneurship courses and students who had been entrepreneurs. Sampling using a purposive sampling technique. The data source is primary data. Data collection was carried out through questionnaires. The measurement uses a Likert scale. The next stage, the results of the questionnaire were analyzed with multiple linear regression which serves to prove the research hypothesis. The data that has met the validity test, reliability test, and the classic assumption test are processed to produce a regression equation. Based on the results of the study showed that internal and external factors partially had a positive and significant effect on the entrepreneurial interest of STAI Muhammadiyah Tulungagung students. With an adjusted R2 value of 0.407 so the magnitude of the influence of internal and external factors on entrepreneurial interest is 40.7% while the remaining 59.3% is influenced by other factors not examined in this study.Keywords: Factors, Interests, Entrepreneurship, STAI Muhammadiyah Tulungagung

METHODOLOGY FOR CHOOSING THE ORGANIZATIONAL STRUCTURE OF ENTERPRISE MANAGEMENT

2020 ◽  
Vol 10 (9) ◽  
pp. 2003-2012
Author(s):  
O.V. Karpets ◽  
◽  
A.V. Sinitsyn ◽  
A.V. Firsova ◽  
◽  
...  
Keyword(s):  
Organizational Structure ◽  
Economic Activity ◽  
Organizational Structures ◽  
External Factors ◽  
Enterprise Management ◽  
Urgent Problem ◽  
Internal Factors ◽  
The Moment ◽  
Internal And External Factors

This article discusses the problem of choosing the correct and effective organizational structure of enterprise management for its correct functioning. The existing types of organizational structures of enterprise management, which are used in practice today, are analyzed, and their positive, negative sides and the type of enterprises for which they can be used are revealed. Along with this, this article discusses and describes methods for choosing an organizational structure for an enterprise. Also, during the study, internal and external factors were identified that affect the choice of an organizational structure. Based on the analysis, a methodology for choosing the most effective type of organizational structure for enterprises was drawn up. The question of choosing an organizational structure is acute for every manager at the very beginning of the operation of an enterprise, because the quality of performance of functions, both of individual divisions and of the entire enterprise as a whole, directly depends on this. Among many types of organizational structures in this study, the types of organizational structures that are most adaptable to changes in external and internal factors are identified. This study provides methods and tools for selecting the appropriate organizational structure for any enterprise. At the moment, some methods, be it goal structuring or computer modeling, are not widely used, which in turn makes it difficult to choose an effective organizational structure for enterprise management. The choice of an effective organizational structure is an extremely urgent problem today for every entrepreneur, who is interested in the stable economic activity of his or her enterprise.

scholarly journals Ice nucleation efficiency of AgI: review and new insights

2016 ◽  
Author(s):  
Claudia Marcolli ◽  
Baban Nagare ◽  
André Welti ◽  
Ulrike Lohmann
Keyword(s):  
Water Saturation ◽  
Experimental Studies ◽  
Freezing Temperature ◽  
Nucleating Agent ◽  
Companion Paper ◽  
Chem Phys ◽  
Ice Nucleation ◽  
Lattice Match ◽  
Ice Nuclei ◽  
Immersion Freezing

Abstract. AgI is one of the best investigated ice nuclei. It has relevance for the atmosphere since it is used for glaciogenic cloud seeding. Theoretical and experimental studies over the last sixty years provide a complex picture of silver iodide as ice nucleating agent with conflicting and inconsistent results. This review compares experimental ice nucleation studies in order to analyse the factors that influence the ice nucleation ability of AgI. We have performed experiments to compare contact and immersion freezing by AgI. This is one of three papers that describe and analyse contact and immersion freezing experiments with AgI. In Nagare et al. (Nagare, B., Marcolli, C., Stetzer, O., and Lohmann, U.: Comparison of measured and calculated collision efficiencies at low temperatures, Atmos. Chem. Phys., 15, 13759–13776, doi:10.5194/acp-15-13759-2015, 2015) collision efficiencies based on contact freezing experiments with AgI are determined and compared with theoretical formulations. In a companion paper, contact freezing experiments are compared with immersion freezing experiments conducted with AgI, kaolinite, and ATD as ice nuclei. The following picture emerges from this analysis: The ice nucleation ability of AgI seems to be enhanced when the AgI particle is on the surface of a droplet, which is indeed the position that a particle takes when it can freely move in a droplet. Ice nucleation by particles with surfaces exposed to air, depends on water adsorption. AgI surfaces seem to be most efficient as ice nuclei when they are exposed to relative humidity at or even above water saturation. For AgI particles that are totally immersed in water, the freezing temperature increases with increasing AgI surface area. Higher threshold freezing temperature seem to correlate with improved lattice matches as can be seen for AgI-AgCl solid solutions and 3AgI•NH4I•6H2O, which have slightly better lattice matches with ice than AgI and also higher threshold freezing temperatures. However, the effect of a good lattice match is annihilated when the surfaces have charges. Also, the ice nucleation ability seems to decrease during dissolution of AgI particles. This introduces an additional history and time dependence of ice nucleation in cloud chambers with short residence times.

scholarly journals Investigating the role of dust in ice nucleation within clouds and further effects on regional weather system over East Asia – Part I: model development and validation

2017 ◽  
Author(s):  
Lin Su ◽  
Jimmy C.H. Fung
Keyword(s):  
East Asia ◽  
Source Region ◽  
Model Development ◽  
Ice Nucleation ◽  
Dust Particles ◽  
Weather System ◽  
Microphysics Scheme ◽  
Ice Nuclei ◽  
Cloud Ice ◽  
Ice Water

Abstract. The GOCART–Thompson microphysics scheme, which couples the Goddard Chemistry Aerosol Radiation and Transport (GOCART) model and aerosol-aware Thompson microphysics scheme, has been implemented in the Weather Research and Forecast model coupled with Chemistry (WRF-Chem), to quantify and evaluate the effect of dust on the ice nucleation process in the atmosphere by serving as ice nuclei. The performance of the GOCART-Thompson microphysics scheme in simulating the effect of dust in atmospheric ice nucleation is then evaluated over East Asia during spring in 2012, a typical dust-intensive season. Based upon the dust emission reasonably reproduced by WRF-Chem, the effect of dust on atmospheric cloud ice water content is well reproduced. With abundant dust particles serving as ice nuclei, the simulated ice water mixing ratio and ice crystal number concentration increases by one order of magnitude over the dust source region and downwind areas during the investigated period. The comparison with ice water path from satellite observations demonstrated that the simulation of cloud ice profile is substantially improved by applying the GOCART–Thompson microphysics scheme in the simulations. Additional sensitivity experiments are carried out to optimize the parameters in the ice nucleation parameterization in the GOCART–Thompson microphysics scheme, and the results suggest that the calibration factor in the ice nucleation scheme should be set to 3 or 4. Lowering the threshold relative humidity with respect to ice to 100 % for the ice nucleation parameterization leads to further improvement in cloud ice simulation.

scholarly journals Bacterial Ice Nucleation: A Factor in Frost Injury to Plants

1982 ◽  
Vol 70 (4) ◽  
pp. 1084-1089 ◽  
Author(s):  
Steven E. Lindow ◽  
Deane C. Arny ◽  
Christen D. Upper
Keyword(s):  
Ice Nucleation ◽  
Frost Injury

scholarly journals ANALISIS KRIMINOLOGI KEJAHATAN PEMBUNUHAN BERENCANA OKNUM POLISI DI JAYAPURA

2021 ◽  
Vol 5 (2) ◽  
pp. 47
Author(s):  
Sujud Sujud
Keyword(s):  
Research Method ◽  
Criminal Code ◽  
Research Data ◽  
External Factors ◽  
Family Factors ◽  
Military Officers ◽  
Literature Study ◽  
Internal Factors ◽  
The Government ◽  
Internal And External Factors

Murder is an inhuman crime, where the perpetrator of the crime kills with the intention of being planned in advance because it will kill other people's lives for a specific purpose, this crime is a crime of enmity between individuals and groups so that the victim is helpless, so the police investigator reveals his identity. Carefulness is needed. The problems discussed are what are the factors causing the crime of murder and how are the efforts to overcome the crime of murder. The research method used is normative juridical research. Data collection is based on literature study, based on the results of the research that the author has done, the factors that cause murder are internal and external factors. Internal factors, namely internal factors, and external factors, namely economic, environmental, and family factors. Efforts to tackle the crime of murder, namely penal and non-penal measures, are efforts to reduce the space for movement and opportunities for the committing of crimes. The suggestion in this research is that there is a need for cooperation between legal institutions and the government through police and military officers to prevent and cope with future premeditated murder, prosecutors and judges are requested to be able to prosecute and impose the maximum possible punishment on the perpetrators of the murder guided by the Criminal Code.

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