scholarly journals Thermoplastic Processing of PLA/Cellulose Nanomaterials Composites

Polymers ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1363 ◽  
Author(s):  
T. Mokhena ◽  
J. Sefadi ◽  
E. Sadiku ◽  
M. John ◽  
M. Mochane ◽  
...  
Keyword(s):  
Melt Spinning ◽  
High Strength ◽  
Thermomechanical Properties ◽  
Critical Factors ◽  
Short Term ◽  
The Past ◽  
Heat Distortion Temperature ◽  
Strength And Stiffness ◽  
Cellulose Nanomaterials ◽  
Processing Techniques

Over the past decades, research has escalated on the use of polylactic acid (PLA) as a replacement for petroleum-based polymers. This is due to its valuable properties, such as renewability, biodegradability, biocompatibility and good thermomechanical properties. Despite possessing good mechanical properties comparable to conventional petroleum-based polymers, PLA suffers from some shortcomings such as low thermal resistance, heat distortion temperature and rate of crystallization, thus different fillers have been used to overcome these limitations. In the framework of environmentally friendly processes and products, there has been growing interest on the use of cellulose nanomaterials viz. cellulose nanocrystals (CNC) and nanofibers (CNF) as natural fillers for PLA towards advanced applications other than short-term packaging and biomedical. Cellulosic nanomaterials are renewable in nature, biodegradable, eco-friendly and they possess high strength and stiffness. In the case of eco-friendly processes, various conventional processing techniques, such as melt extrusion, melt-spinning, and compression molding, have been used to produce PLA composites. This review addresses the critical factors in the manufacturing of PLA-cellulosic nanomaterials by using conventional techniques and recent advances needed to promote and improve the dispersion of the cellulosic nanomaterials. Different aspects, including morphology, mechanical behavior and thermal properties, as well as comparisons of CNC- and CNF-reinforced PLA, are also discussed.

scholarly journals Processing of Thermoplastic PLA/Cellulose Nanomaterials Composites

2018 ◽  
Author(s):  
Teboho Clement Mokhena ◽  
Jeremia Shale Sefadi ◽  
Emmanuel Rotimi Sadiku ◽  
Maya Jacobs John ◽  
Mokgaotsa Jonas Mochane ◽  
...  
Keyword(s):  
Melt Spinning ◽  
High Strength ◽  
Thermomechanical Properties ◽  
Short Term ◽  
Compression Moulding ◽  
Heat Distortion Temperature ◽  
Frame Work ◽  
Strength And Stiffness ◽  
Cellulose Nanomaterials ◽  
Processing Techniques

Over the past decades, research has escalated on the use of polylactic acid (PLA) as replacement for petroleum-based polymers. This is due to its valuable properties, such as renewability, biodegradability, biocompatibility and good thermomechanical properties. Despite possessing good mechanical properties comparable to conventional petroleum-based polymers, PLA suffers from some shortcomings such as low thermal resistance, heat distortion temperature and rate of crystallization, thus different fillers have been used to overcome these limitations. In the frame work of environmentally friendly processes and products, there has been growing interest on the use of cellulose nanomaterials viz. cellulose nanocrystals (CNC) and nanofibers (CNF) as natural fillers for PLA towards advanced applications other than short-term packaging and biomedical. Cellulosic nanomaterials are renewable in nature, biodegradable, eco-friendless and they possess high strength and stiffness. In the case of eco-friendly processes, various conventional processing techniques, such as melt extrusion, melt-spinning, and compression moulding, have been used to produce PLA composites. This review addresses the critical factors in the manufacturing of PLA-cellulosic nanomaterials by using conventional techniques and recent advances needed to promote and improve the dispersion of the cellulosic nanomaterials. Different aspects, including morphology, mechanical behavior and thermal properties, as well as comparisons of CNC- and CNF reinforced PLA, are also discussed

Obesity and adiposity: the culprit of dietary protein efficacy

2020 ◽  
Vol 134 (4) ◽  
pp. 389-401
Author(s):  
Carla El-Mallah ◽  
Omar Obeid
Keyword(s):  
Food Intake ◽  
Behavioural Change ◽  
Physiological Mechanism ◽  
Short Term ◽  
The Past ◽  
Body Adiposity ◽  
Reduce Sugar ◽  
Eye Opening ◽  
Potential Strategy ◽  
Limitations And Exceptions

Abstract Obesity and increased body adiposity have been alarmingly increasing over the past decades and have been linked to a rise in food intake. Many dietary restrictive approaches aiming at reducing weight have resulted in contradictory results. Additionally, some policies to reduce sugar or fat intake were not able to decrease the surge of obesity. This suggests that food intake is controlled by a physiological mechanism and that any behavioural change only leads to a short-term success. Several hypotheses have been postulated, and many of them have been rejected due to some limitations and exceptions. The present review aims at presenting a new theory behind the regulation of energy intake, therefore providing an eye-opening field for energy balance and a potential strategy for obesity management.

Impact of FII’s and FDI’s on Indian Stock Market

2016 ◽  
Vol 1 (1) ◽  
Author(s):  
Dr. Kamlesh Kumar Shukla
Keyword(s):  
Stock Market ◽  
Financial Markets ◽  
Global Economy ◽  
Short Term ◽  
Earnings Growth ◽  
The Past ◽  
Bull Market ◽  
Indian Stock Market

FIIs are companies registered outside India. In the past four years there has been more than $41 trillion worth of FII funds invested in India. This has been one of the major reasons on the bull market witnessing unprecedented growth with the BSE Sensex rising 221% in absolute terms in this span. The present downfall of the market too is influenced as these FIIs are taking out some of their invested money. Though there is a lot of value in this market and fundamentally there is a lot of upside in it. For long-term value investors, there’s little because for worry but short term traders are adversely getting affected by the role of FIIs are playing at the present. Investors should not panic and should remain invested in sectors where underlying earnings growth has little to do with financial markets or global economy.

scholarly journals What Has Clinical Research in Suicide Prevention Done for You Lately?

CNS Spectrums ◽  
2006 ◽  
Vol 11 (6) ◽  
pp. 440-441 ◽  
Author(s):  
Jan Fawcett
Keyword(s):  
Suicidal Ideation ◽  
Suicide Risk ◽  
Clinical Status ◽  
Panic Attacks ◽  
Current Evidence ◽  
Suicide Risk Assessment ◽  
Short Term ◽  
The Past ◽  
Standard Risk ◽  
Suicide Plan

What have you heard or read over the past 10 years that has improved you ability to assess and manage suicide risk in your patients?There has been a paucity of data. What little data there is reviewed in this month's articles.They highlight findings that you should know about. Clinicians seem to cling to the familiar, unless some intense marketing is done.For instance, are you aware that the current evidence shows that a denial of suicide thoughts, plans, or intent—even a contract for safety—means absolutely nothing in the absence of a full suicide risk assessment?Yet clinicians seem to rely on these ’reassurances“ from their patients and are shocked when the patient later commits suicide. Why should a patient who is deciding that life is too painful to live tell you the truth? Robert I. Simon, MD, and Daniel W. Shuman, JD, review these facts.Are you aware that severe psychic anxiety, panic attacks, agitation, and severe insomnia often precede suicide within hours, days, or weeks and can be rapidly modified with treatment?On the other hand, standard risk factors for suicide such as suicidal ideation, hopelessness, and past suicidal attempts are not good predictors of suicide in the short term. A suicide plan, recent high intent attempt, or refusal to contract for safety may well indicate immediate risk, but a denial of suicidal ideation or intent and a contract for no harm mean absolutely nothing without a full suicide assessment that takes current clinical status, past suicidal tendencies, social support, and willingness to accept help into account.

Modelling and simulation of ship collisions in port and coastal waters

2021 ◽  
pp. 147509022198918
Author(s):  
Chien-Chang Chou
Keyword(s):  
Coastal Waters ◽  
Maritime Transportation ◽  
Critical Factors ◽  
Ship Maneuvering ◽  
Collision Model ◽  
The Past ◽  
Sea Current ◽  
Ship Collision ◽  
Comparison Of The Results ◽  
Collision Models

Navigational safety is an important issue in maritime transportation. The most frequent type of maritime accident in the port and coastal waters is the ship collision. Although some ship collision models have been developed in the past, few have taken account of wind and sea current effects. However, wind and sea current are critical factors in ship maneuvering. Therefore, based on the previous collision model without wind and sea current effects, this study further develops a ship collision model with wind and sea current effects. Finally, a comparison of the results for the proposed collision model in this study and the ship maneuvering simulator is shown to illustrate the effectiveness of the proposed mathematical model in this paper, followed by the conclusions and suggestions given to navigators, port managers, and governmental maritime departments to improve navigational safety in port and coastal waters.

scholarly journals Materials for Automotive Lightweighting

2019 ◽  
Vol 49 (1) ◽  
pp. 327-359 ◽  
Author(s):  
Alan Taub ◽  
Emmanuel De Moor ◽  
Alan Luo ◽  
David K. Matlock ◽  
John G. Speer ◽  
...  
Keyword(s):  
Galvanic Corrosion ◽  
Low Carbon Steel ◽  
High Strength Steels ◽  
High Strength ◽  
Low Carbon ◽  
New Materials ◽  
Specific Strength ◽  
Advanced High Strength Steels ◽  
Strength And Stiffness ◽  
The Cost

Reducing the weight of automobiles is a major contributor to increased fuel economy. The baseline materials for vehicle construction, low-carbon steel and cast iron, are being replaced by materials with higher specific strength and stiffness: advanced high-strength steels, aluminum, magnesium, and polymer composites. The key challenge is to reduce the cost of manufacturing structures with these new materials. Maximizing the weight reduction requires optimized designs utilizing multimaterials in various forms. This use of mixed materials presents additional challenges in joining and preventing galvanic corrosion.

Man and Nature in China

1967 ◽  
Vol 1 (4) ◽  
pp. 313-333 ◽  
Author(s):  
Rhoads Murphey
Keyword(s):  
Public Good ◽  
New Order ◽  
Short Term ◽  
Contemporary China ◽  
The Past ◽  
The World ◽  
Man And Nature ◽  
Individual Actions ◽  
Communist Past ◽  
Chinese View

After nearly two decades of revolutionary rule in China, the break with the past which Communist direction has seemed to represent is increasingly being seen in a wider perspective. Few scholars would attempt to argue that the Communists have not brought a genuine revolution or that their ascendancy is merely the equivalent of a new dynasty. But as the character of the new order has become clearer with time and as an analysis both more detailed and less concerned with short-term matters has become possible, many scholars have been as much impressed by continuities with the pre-Communist past as by discontinuities. To take perhaps the clearest example, the current Chinese view of their relation to the rest of the world appears to represent little change from the traditional Sinocentric image. Ideological absolutism is also not new to China with Mao Tse-tung, nor is the conception of individual subsevience to public good, the unquestioned rightness of close social limits on individual actions. And contemporary China retains, for all its professed egalitarianism, a strongly elitist and hierarchial pattern.

Economic Origins of Electoral Support for Authoritarian Successors

2007 ◽  
Vol 41 (3) ◽  
pp. 362-388 ◽  
Author(s):  
Byong-Kuen Jhee
Keyword(s):  
Economic Performance ◽  
Economic Voting ◽  
Authoritarian Regime ◽  
Economic Conditions ◽  
New Democracies ◽  
Democratic Transitions ◽  
Short Term ◽  
Knee Jerk ◽  
The Past ◽  
Electoral Support

This study explores how economic performance prior to democratic transitions affects the fate of successors to authoritarian rulers in new democracies. It investigates 70 founding election outcomes, finding that successful economic performance under an authoritarian regime increases the vote share of successors. It also finds that the past economic performance of authoritarian rulers decreases the likelihood of government alternation to democratic oppositions. Interim governments that initiate democratic transition, however, are neither blamed nor rewarded for economic conditions during transition periods. This study concludes that electorates are not myopic and that economic voting is not a knee-jerk reaction to short-term economic performance in new democracies.

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