Design, Modeling and Ride Analysis of Energy-Harvesting Hydraulically Interconnected Suspension

This paper introduces a novel energy-harvesting hydraulically interconnected suspension (EH-HIS) to improve the riding comfort and road handling performance for off-road vehicles while harvesting the vibration energy traditionally dissipated into heat by the oil shock absorbers. To understand the system, we built a model of the off-road vehicle equipped with the EH-HIS and conducted the performance analysis. The system model is established based on the pressure drop principle and validated by commercial simulation software AMESim. The damping characteristic and energy harvesting performance have been investigated based on the mathematical suspension model. Further, a thorough analysis is implemented to compare the dynamic responses of the vehicle equipped with the traditional suspension and EH-HIS under different driving speeds and road classes. Results show that the EH-HIS system can provide tunable asymmetric damping from 3134 Ns/ to 7558 Ns/m, which covers most of the damping range of the off-road vehicles. The average regenerative power of the half EH-HIS system reaches 438 watts, and the corresponding hydraulic efficiency reaches 19%, at a vibration input of 2 Hz frequency and 30 mm amplitude. The ride analysis shows that the vehicle equipped with the EH-HIS system on the D class road has good handling stability and better ride comfort over the traditional suspension.

Effect of tobacco on oral cavity stem cells. A brief review

In recent years, mesenchymal stem cells (MSCs) have become the cornerstone of tissue engineering and regenerative medicine. MSCs can be easily obtained from adult tissues, it is in this area that obtaining and using oral MSCs have become a good source of experimentation. It is not unknown that MSCs have great regenerative power, high proliferative and differentiation capacity and high osteogenic potential. However, they can be affected by multiple external factors. The objective of this article is to describe the effect of tobacco on oral MSCs. Cigarettes and its components are a risk factor for various diseases at the level of the oral cavity, they have many adverse effects on the cellular biology of the mouth, therefore, it is not strange to think about the effect that these components can have on MSCs. of oral origin. The latest studies have shown that nicotine and condensed cigarette smoke have negative biological effects on MSCs, particularly oral ones. Despite the existing literature, it is not entirely clear what are the mechanisms involved in the negative effects of tobacco on oral MSCs and how they could be reversed.

Fibronectin meshwork controls epithelial stem cell fate

Adult stem cell fate is tightly balanced by the local microenvironment called niche and sustain tissue regeneration. How niche signals are integrated and regulate regeneration remains largely unexplored. The extracellular matrix and integrin ligand fibronectin is a crucial and well-characterized wound healing actor that has never been involved in skin regeneration. Here, we show that fibronectin displays a highly specific enrichment in hair follicle stem cells (HFSC) at the onset of regeneration. Conditional deletion of fibronectin in HFSC compartment (Lrig1, K19) leads to hair regeneration blockade, impaired stem cell location and fate. Dermal injection of exogenous fibronectin rescues these phenotypes. To elucidate molecular mechanism underlying fibronectin function, we used conditional deletion models of SLC3A2, the main integrin coreceptor. We show that, via its role in integrin-dependent assembly of fibronectin matrix, SLC3A2 acts as molecular relay of niche signals. Thus, fibronectinintegrin-SLC3A2 cascade finely tunes HFSC fate and tissue regenerative power.

Better understanding the state of Mongolian society under the Qing Dynasty in order to shed light on changes to the traditional nomadic lifestyle of Inner Mongolians

Inner Mongolia is an autonomous region of China. Nowadays, the traditional nomadic lifestyle of Inner Mongolians is increasingly difficult to maintain. Good and abundant pastures with water fields and soil with soda are key to this lifestyle as they are essential for livestock. In recent years, however, livestock numbers have decreased and, additionally, Inner Mongolians have experienced lifestyle changes such as remaining in one location instead of moving with the changing seasons. Furthermore, grasslands that once grew across the land have lost some of their regenerative power and now grow in patches and only to a relatively small height. Dr. Chaolumenggerile, Inner Mongolia University, China, is exploring historical materials in an effort to better understand these changes and in order to ascertain what can be done to preserve the traditional nomadic lifestyle of Inner Mongolians. She believes that understanding the state of Mongolian society under the Qing Dynasty 300 years ago would contribute to better understanding the current state of Mongolian society and is working to understand the rangeland demarcation policy that was implemented under the Qing Dynasty rule and how it penetrated Mongolian society. Part of the work involves investigating pasture conflicts in Mongolia during the Qing Dynasty and she has already succeeded in shedding light on the forms and patterns of rangeland conflicts that existed during that time.

Estimating an Achievable Target Price to Regenerate Bio-Oils Post Hydrogen Sulfide Removal

Bio-oils offer valuable use as bio-solvents for removing hydrogen sulfide (H2S) from natural gas. Preceding bench-scale studies indicate that greater than 90% of H2S can be removed from a gas stream; economic analysis of such a process is necessary to determine solvent regenerative power required and price limits on a to-be-determined solvent regeneration scheme. With a processing goal 1000 kmol/h of sour gas and removing 99.9% of H2S from gas streams at variable feed concentration, design of an absorption unit to process natural gas using bio-oils was carried out through equilibrium stage analysis. Comparison to conventional amine gas treating was used as a cost threshold for gas treatment. The economic viability of using bio-oils as gas sweetening agents depends on capability of regenerating and recycling more than 98% of the soybean oil bio-solvent to compete with amine gas treating, the most popular industrial method.

Back-iron design-based electromagnetic regenerative tuned mass damper

Implementation of tuned mass dampers is the commonly used approach to avoid excessive vibrations in civil engineering. However, due to the absence of the compact dimension, there are still no practical applications of the tuned mass dampers in automotive industry. Meanwhile, recent investigations showed the benefit of utilizing a tuned mass damper in a vehicle suspension in terms of driving comfort and road holding. Thus, the current investigation aimed to explore a novel compact dimension tuned mass damper, which can provide both sufficient vibration mitigation and energy harvesting. This paper presents a prototype of a back-iron-based design of an electromagnetic regenerative tuned mass damper. The mathematical model of the tuned mass damper system was developed and has been validated by the experimental results of the tuned mass damper prototype implemented in a protected mass test-bench. The indicated results concluded that the attenuation performance dramatically deteriorated under random excitations and a reduction in the root-mean-square acceleration of 18% is concluded compared to the case with undamped tuned mass damper. Under harmonic excitations, the designed tuned mass damper prototype is able to reduce the peak acceleration value of the protected structure by 79%. According to the experimental results, the designed tuned mass damper prototype revealed a peak regenerative power of 0.76 W under a harmonic excitation of 8.1 Hz frequency [Formula: see text]m amplitude. Given the simulated random road profiles from C to E, the back-iron electromagnetic tuned mass damper indicated that root-mean-square harvested power from 0.6 to 6.4 W, respectively.