With our growing need for highly efficient energy supplies, a demand for new devices with better energy conversion and storage capabilities arises. Asymmetric supercapacitors combining a pseudocapacitive and an EDLC electrode show great potential as a prospective energy storage device. The relatively broad voltage window and low cost of iron (II, III) oxide and the eminent properties of graphene nanosheets (high electrical conductivity, large surface area, etc.) make them ideal candidates for the electrode materials of supercapacitors. An asymmetric supercapacitor using iron (II, III) oxide as the anode and graphene nanosheets the cathode with an aqueous electrolyte of 3 M potassium hydroxide was proposed here. Iron (II, III) oxide nanoparticles were synthesized from FeCl3·6H2O using a hydrothermal approach. Graphene nanosheets were prepared from fine-grained graphite raw materials via Hummer’s method. The electrochemical performance of the device was characterized using a triple-electrode setup, with the electrodes being submerged in a medium of 6 M KOH. This specific asymmetrical supercapacitor shows promise as a practical foundation towards a future of more effective energy transformation and storage, such as line-filtering and signal selection, particularly due to the relative abundance and environmentally-friendly nature of its electrode materials.

The paper is divided into five parts. The first part is about the history and development of penicillin, which introduces the following section. The second part contains basic information about penicillin, the fermentation process and the preparation process. This article provides detailed information on penicillin. The third part describes the purification process of penicillin, using the papers of others to support my data. This is followed by a comparison of the advantages and disadvantages of penicillin with other penicillin antibiotics. Finally, I explain the current state of penicillin and give my opinion on its future development. In my opinion, penicillin is fading, but without it we cannot invent these newer drugs to take its place. And these new antibiotics are all in the penicillin class. But as more people use penicillin, resistance will build up. This could lead to strong allergic reactions to new drugs that are also in the penicillin group. So it is hoped that in the future people will be able to invent drugs that reduce allergies to penicillin.

Earthquake and seismic-resistant concrete structures are essential components and requirements of structural design. The performance and response of concrete structures during/after the earthquake event are significant to determine the condition of the structures as well as to identify the possibility of structural failure. The main objective is to investigate the appropriate method to evaluate the impact on the structure due to earthquakes based on closed-form solutions, and to determine its differences with the results of numerical modelling. The seismic behavior of structures is required to be designed in accordance with the minimum design requirements specified in the Standard. Seismic design, where ground behavior is considered, is presented as a significant part of design analyses, and ground movement and shaking, are associated with the ground deformation which is the primary seismic load consideration for the design of plain or reinforced concrete structures. The outcome of the longitudinal analysis provided the maximum axial and bending strain which is adopted to calculate the combined strain. These results of strain are considered with the design of concrete structures against Ultimate Limit State and Service Limit State design phases. Therefore, the results evaluate the effect of seismic design on the performance of the concrete structure.

Vanillin is an important spice, widely used in food, beverage, daily necessities, medicine and other fields. In this paper, the research progress of preparation techniques chemical synthesis, plant extraction and biotransformation of vanillin was reviewed. The detection methods of vanillin such as gas chromatography, liquid chromatography and electrochemical method were summarized, which provide reference for the development and research of vanillin in the future.

In today ' s world, the energy crisis and environmental pollution are becoming more and more serious. As a renewable energy, solar energy has become one of the important means to meet the global energy demand. Making solar cells using volt effect is an effective way to convert solar energy into electricity. In order to employ solar photovoltaic power generating technology with high efficiency and cheap cost, new solar cell research and development is being done. Among them, organic solar cells are considered as one of the promising solar photovoltaic technologies because of their light weight, simple preparation process, good flexibility and easy to achieve large area processing. While perovskite solar cells are developed in a high speed in recent year because of their simple production and long service life. The urgent problem in this field is further improve the energy conversion efficiency of solar cells. In order to solve these problems, we study the structure principle and electron transport layer of solar cells, and get solutions by analyzing these problems.

Since the fossil energy is depleting day by day, the development of renewable energy is urgent. Solar energy is one of the most potential clean energy sources, and the efficiency of solar cells still has a lot of room to improve, which leads to their application scope not being wide. This paper aims to summarize the views of different scholars on ways to improve the efficiency of solar cells. Through experiments and numerical simulations, people try to overcome this problem, and they find that the material selection and surface treatment of solar cells can be optimized so that the efficiency of solar cells can be improved.

The purpose of this paper is to act as a fundamental guideline covering the starting retrosynthesis concepts and to incorporate some of the essential skills and knowledge for new starters in designing a retrosynthesis plan. The retrosynthesis approaches such as fine tuning and various group disconnections are presented before showing a full and detailed retrosynthesis analysis example.

The traditional preparation methods of polystyrene microspheres are emulsion polymerization and suspension polymerization. The diameter of the microspheres prepared by the former is generally less than 0.5 μm, and the diameter of the microspheres prepared by the latter is about several hundred microns and is difficult to control. With the continuous development of science and technology, scientists have found multiple methods to prepare micron-sized monodisperse polymer microspheres in recent years. Such as soap-free or low-soap emulsion method, dispersion polymerization method, liquid-phase synthesis method. The four preparation methods of dispersion polymerization, emulsion polymerization, liquid-phase synthesis, suspension polymerization and their respective advantages and disadvantages are discussed in detail, and the prospect of synthetic application is prospected.

Based on the threat of cancer to human life and the surge in breast cancer prevalence and mortality in recent years, existing drugs and treatments remain harmful and have side effects. A nano-drug delivery platform is proposed to achieve precise drug delivery in time and space aspects. Two anti-cancer drugs were encapsulated in a nanoplatform and the synergistic effect of these two drugs was utilized to reduce the toxicity of a single drug in conventional chemotherapy and to improve the accuracy of drug delivery. Also, in-vitro and in-vivo experiments of this nanoplatform were designed, and data were collected and analysed to demonstrate the feasibility and future development prospects.

Polybutylene terephthalate and polyethylene glycol terephthalate are subjected to thermal-oxidative degradation and thermomechanical degradation during the process of melt blending, which affect the polymer structure and properties. The effect of feed properties of polyethylene glycol terephthalate and the addition of modified nanoparticles on blends are a question worthy of discussion. This paper introduced the latest development of biodegradable plastics industry as well as the applications of biodegradable plastics in fibers, daily expenses of membranes and bags, agricultural products and automobile industrial products. These biodegradable plastics included poly (lactic acid), polyhydroxyalknoates, poly (butyl⁃ enes adipate⁃co⁃terephthalate), and poly (propylene carbonate). In addition to biochemical effects, degradation also has biophysical effects, that is, after microorganisms erode the polymer, the polymer material is mechanically damaged due to the increase of cells. Therefore, biodegradation is not a single mechanism, but a compomise biophysical and biochemical synergy and mutual promotion of physical and chemical processes. So far, the mechanism of biodegradation has not been fully elucidated. This paper focuses on explaining the currently clear polymer degradation mechanism and the improvement in composition and structure, so as to offer some references for future studies.