scholarly journals Polymeric nanostructured composite films

2000 ◽  
Vol 72 (1-2) ◽  
pp. 147-155 ◽  
Author(s):  
Jiacong Shen ◽  
Junqi Sun ◽  
Xi Zhang

This research news describes the construction of polymeric nanostructured composite film based on a variety of interactions, such as hydrophobic–hydrophilic effect, electrostatic interaction, hydrogen bonding, etc. The work focused on developing strategies to solve the basic problems in the area of ultrathin film research, such as stability, improving the interface quality, creating patterned interface, and techniques to construct nanolayered structure. With in-depth study of the relationship between the microscopic layered architecture and macroscopic function of supramolecular assemblies, it is anticipated that one could obtain miniature devices or machines of high efficiency through integration of the assembling process and device fabrication.

Author(s):  
Lital Levy

A Palestinian-Israeli poet declares a new state whose language, “Homelandic,” is a combination of Arabic and Hebrew. A Jewish-Israeli author imagines a “language plague” that infects young Hebrew speakers with old world accents, and sends the narrator in search of his Arabic heritage. This book brings together such startling visions to offer the first in-depth study of the relationship between Hebrew and Arabic in the literature and culture of Israel/Palestine. More than that, the book presents a captivating portrait of the literary imagination's power to transgress political boundaries and transform ideas about language and belonging. Blending history and literature, the book traces the interwoven life of Arabic and Hebrew in Israel/Palestine from the turn of the twentieth century to the present, exposing the two languages' intimate entanglements in contemporary works of prose, poetry, film, and visual art by both Palestinian and Jewish citizens of Israel. In a context where intense political and social pressures work to identify Jews with Hebrew and Palestinians with Arabic, the book finds writers who have boldly crossed over this divide to create literature in the language of their “other,” as well as writers who bring the two languages into dialogue to rewrite them from within. Exploring such acts of poetic trespass, the book introduces new readings of canonical and lesser-known authors, including Emile Habiby, Hayyim Nahman Bialik, Anton Shammas, Saul Tchernichowsky, Samir Naqqash, Ronit Matalon, Salman Masalha, A. B. Yehoshua, and Almog Behar. By revealing uncommon visions of what it means to write in Arabic and Hebrew, the book will change the way we understand literature and culture in the shadow of the Israeli–Palestinian conflict.


Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1908
Author(s):  
Hai Li ◽  
Sooman Lim

Self-polarized piezoelectric devices have attracted significant interest owing to their fabrication processes with low energy consumption. Herein, novel poling-free piezoelectric nanogenerators (PENGs) based on self-polarized polyvinylidene difluoride (PVDF) induced by the incorporation of different surface-modified barium titanate nanoparticles (BTO NPs) were prepared via a fully printing process. To reveal the effect of intermolecular interactions between PVDF and NP surface groups, BTO NPs were modified with hydrophilic polydopamine (PDA) and hydrophobic 1H,1H,2H,2H-perfluorodecyltriethoxysilane (PFDTES) to yield PDA-BTO and PFD-BTO, respectively. This study demonstrates that the stronger hydrogen bonding interactions existed in PFD-BTO/PVDF composite film comparative to the PDA-BTO/PVDF composite film induced the higher β-phase formation (90%), which was evidenced by the XRD, FTIR and DSC results, as well as led to a better dispersion of NPs and improved mechanical properties of composite films. Consequently, PFD-BTO/PVDF-based PENGs without electric poling exhibited a significantly improved output voltage of 5.9 V and power density of 102 μW cm−3, which was 1.8 and 2.9 times higher than that of PDA-BTO/PVDF-based PENGs, respectively. This study provides a promising approach for advancing the search for high-performance, self-polarized PENGs in next-generation electric and electronic industries.


Micromachines ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 239
Author(s):  
Yineng Wang ◽  
Xi Cao ◽  
Walter Messina ◽  
Anna Hogan ◽  
Justina Ugwah ◽  
...  

Capillary electrochromatography (CEC) is a separation technique that hybridizes liquid chromatography (LC) and capillary electrophoresis (CE). The selectivity offered by LC stationary phase results in rapid separations, high efficiency, high selectivity, minimal analyte and buffer consumption. Chip-based CE and CEC separation techniques are also gaining interest, as the microchip can provide precise on-chip control over the experiment. Capacitively coupled contactless conductivity detection (C4D) offers the contactless electrode configuration, and thus is not in contact with the solutions under investigation. This prevents contamination, so it can be easy to use as well as maintain. This study investigated a chip-based CE/CEC with C4D technique, including silicon-based microfluidic device fabrication processes with packaging, design and optimization. It also examined the compatibility of the silicon-based CEC microchip interfaced with C4D. In this paper, the authors demonstrated a nanofabrication technique for a novel microchip electrochromatography (MEC) device, whose capability is to be used as a mobile analytical equipment. This research investigated using samples of potassium ions, sodium ions and aspirin (acetylsalicylic acid).


Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1200
Author(s):  
Yong-Joon Jun ◽  
Seung-ho Ahn ◽  
Kyung-Soon Park

The Green Remodeling Project under South Korea’s Green New Deal policy is a government-led project intended to strengthen the performance sector directly correlated with energy performance among various elements of improvement applicable to building remodeling by replacing insulation materials, introducing new and renewable energy, introducing high-efficiency equipment, etc., with public buildings taking the lead in green remodeling in order to induce energy efficiency enhancement in private buildings. However, there is an ongoing policy that involves the application of a fragmentary value judgment criterion, i.e., whether to apply technical elements confined to the enhancement of the energy performance of target buildings and the prediction of improvement effects according thereto, thus resulting in the phenomenon of another important value criterion for green remodeling, i.e., the enhancement of the occupant (user) comfort performance of target buildings as one of its purposes, being neglected instead. In order to accurately grasp the current status of these problems and to promote ‘expansion of the value judgment criteria for green remodeling’ as an alternative, this study collected energy usage data of buildings actually used by public institutions and then conducted a total analysis. After that, the characteristics of energy usage were analyzed for each of the groups of buildings classified by year of completion, thereby carrying out an analysis of the correlation between the non-architectural elements affecting the actual energy usage and the actual energy usage data. The correlation between the improvement performance of each technical element and the actual improvement effect was also analyzed, thereby ascertaining the relationship between the direction of major policy strategies and the actual energy usage. As a result of the relationship analysis, it was confirmed that the actual energy usage is more affected by the operating conditions of the relevant building than the application of individual strategic elements such as the performance of the envelope insulation and the performance of the high-efficiency system. In addition, it was also confirmed that the usage of public buildings does not increase in proportion to their aging. The primary goal of reducing energy usage in target buildings can be achieved if public sector (government)-led green remodeling is pushed ahead with in accordance with biased value judgment criteria, just as in the case of a campaign to refrain from operating cooling facilities in aging public buildings. However, it was possible to grasp through the progress of this study that the remodeling may also result in the deterioration of environmental comfort and stability, such as the numerical value of the indoor thermal environment. The results of this study have the significance of providing basic data for pushing ahead with a green remodeling policy in which the value judgment criteria for aging existing public buildings are more expanded, and it is necessary to continue research in such a direction that the quantitative purpose of green remodeling, which is to reduce energy usage in aging public buildings, and its qualitative purpose, which is to enhance their environmental performance for occupants’ comfort, can be mutually balanced and secured at the same time.


2021 ◽  
Vol 3 (3) ◽  
pp. 214-231
Author(s):  
S.I. Suslova

Introduction: the influence of the material branches of law on the content and development of procedural branches has long been substantiated in the legal literature. At the same time, civil law scholars, limited by the scope of the nomenclature of scientific specialties in legal sciences, do not have the opportunity to conduct dissertation research aimed at identifying the influence of procedural branches on the norms of substantive law. With regard to scientific research, the study of such an impact is currently permissible only within the specialty 12.00.15. Reforming the nomenclature of scientific specialties towards its enlargement creates the basis for the development of the scientific theory of intersectoral relations, developed by M.Iu. Chelyshev. An in-depth study of the intersectoral interaction of civil law and civil procedure will contribute not only to the development of scientific knowledge, but also will allow solving practical problems at a different methodological level. Purpose: to analyze the stages of the formation of scientific specialties in the context of the relationship between civil law and procedure, to identify the advantages and disadvantages of uniting and dividing civil law and procedure in scientific research, to analyze dissertations in different periods of development of the science of civil law and the science of civil procedure, to formulate ways to improve directions of research to bridge the gap between the science of civil law and procedure. Methods: empirical methods of description, interpretation; theoretical methods of formal and dialectical logic. The legal-dogmatic private scientific method was used. Results: identified the main views on the ratio of material and procedural branches in legal science; it is illustrated that the intersectoral approach is currently admissible only for dissertations in the specialty 12.00.15, which led to an almost complete absence of scientific research on this topic in civil science; substantiated the need to establish the bilateral nature of the relationship and interaction of material and procedural block. Conclusions: reforming the nomenclature of scientific specialties by right in the direction of their enlargement should have a positive effect on bridging the gap that has developed between works on civil law and civil law procedure in the last years of their separate existence. This is especially true of civil science, which developed its own scientific theories in isolation from the possibilities of their implementation within the framework of procedural law. The methodological basis for solving these problems has already been formed – this is an intersectoral method, the application of which is justified and demonstrated in the works of M.Iu. Chelyshev.


2019 ◽  
Vol 3 (122) ◽  
pp. 59-71
Author(s):  
Volodymyr Serhiiovych Hryshyn ◽  
Serhii Oleksiiovych Abramov

Technological possibilities of jet processing cause increased attention to the study of the regularities of the process. The main interest for practice is the establishment of the kind of dependencies between technological parameters (abrasive particles size, particle speed, concentration, compressed air pressure, attack angle, physical and mechanical properties of particles and surface to be treated) and initial process parameters (roughness of the treated surface, removal rates of the metal and libel). That, in turn, determines the necessity of optimal choice of the values of technological parameters in the conditions of a concrete production situation. The basic regularities can be established as a result of regression analysis of experimental data. However, the use of the resulting laws is limited to the complexity of the process and relatively narrow areas of changing the parameters of the experiment.The purpose of the work is to determine the factors that determine the formation of a microrelief in the area of the abrasive air jet, the relationship between them and the degree of their effect on the intensity of the formation of a microrelief; formation of a model of finishing treatment of collector plates, creation of theoretical bases and methodology of designing high-efficient resource-saving technological processes of production of motor collectors of electric machines.Analysis of recent research and publications. The following contributions were made to the development of the theory of modeling of the inkjet-abrasive surface treatment: Volovetsky O.E., Denysyuk V.Yu., Kharchik M.M., Buts BP, Andilahi A.A., Novikov FV, Gordeyev AI, Urbanyuk Ye.A., Silin R.S. and other.The most universal approach based on determining the search dependencies and solving the problem of optimizing the technological parameters of the processing process as a result of statistical simulation, namely the ability to control the input parameters before the start of the model or in the process of work - one of the key benefits of using simulation modeling for the analysis of systems and processes. This allows you to determine the optimal parameters, which maximize the efficiency of the processes, determine the relationship between the input and output parameters.The paper considers: creation of theoretical bases and methodology of designing high-efficiency resource-saving technological processes of production of motor collectors of electric machines; the process of formation of microrelief of collector plates in the area of the abrasive air jet, the relationship between the factors and the degree of their influence on the intensity of formation. The formation of a model of finishing treatment of collector plates treated with silicon carbide (black) was determined.Prospects for further research are the improvement of the technological process of obtaining collector nodes on the possibilities of implementation.


2020 ◽  
Vol 20 (4) ◽  
pp. 747-762
Author(s):  
Abdusamat Akhatovich Khaydarov

Significant geopolitical changes taking place in the modern world in recent decades urge us to take a fresh look at the role of Islam and the clergy in the political processes of a number of countries of the Muslim world. This perspective is especially relevant vis--vis Afghanistan where a fierce war is being waged under the slogans of Islam for more than four decades. The purpose of this research is an in-depth study of the relationship between the state and the Muslim clergy, Islamic institutions in the development of political processes in Afghanistan since the mid-70s of the last century. The article reflects shaping of the Islamic opposition and its efforts to stand up to innovations and reforms during attempts of the Soviet stile modernization in 1978-1992, and then the efforts to democratize Afghan society, undertaken in Afghanistan since the end of 2001 with the assistance of the international community. The work is based on the study of factual historical material, a chronicle of the events of the last decade and personal observations of the author during his work in Afghanistan during the mentioned period. Analytical materials published on the pages of English and Russian mass media were used. The methodological basis of this study is the comparative historical method; the article is based on the principles of historicism, reliability and scientific objectivity. The author concludes that the conflict is based on mistakes and underestimation by the state the role and influence of the Muslim clergy and Islamic institutions of the country. It has been noted that the recently reached US - Taliban agreements, as well as the assistance of such influential players as Russia, sparkle hope for the launch of a direct inter-Afghan negotiation process, which most likely will not be as simple but thorny.


The paper investigates the feasibility of adding a liquid heater to an oil-immersed transformer. It proves that design the high efficiency of power transformers, losses due to idling and short circuits are substantial and are scattered in the environment as heat. The paper proposes a novel design that implements a liquid (coolant) heater to enable the unit not only to convert electricity, but also to generate heat. In order to analyze the feasibility of such heat recycling, the authors have developed an equivalent thermal circuit and a mathematical model thereof. Said heater can operate in two modes. In the passive mode, the coolant it contains only absorbs the heat emitted (lost) by the power transformer. In the active mode, it also receives the heat emitted due to the passage of electric current through the pipes of the heater. The paper further introduces the definition of heater efficiency. Studies have shown that up to 50 % of transformer heat losses can be recycled by heating the coolant in the heater. The paper presents the relationship between utilized heat and transformer losses, as well as heater efficiency as a function of coolant flow rate. The heater efficiency exceeds 90 % in the active mode.


2017 ◽  
Vol 14 (1) ◽  
pp. 67-81
Author(s):  
Mohd A’Tarahim Mohd Razali Bin Mohd Razali ◽  
Mohd Yakub @ Zulkifli Mohd Yusoff Bin Mohd Yusoff ◽  
Nor Hafizi Yusof Bin Yusof ◽  
Siti Fatimah Salleh Binti Salleh ◽  
Mohd Faiz Hakimi Mat Deris Bin Mat Deris ◽  
...  

The aim of this study is to explore the importance of Qira’at Mutawatirah as a discipline particularly in the field of fiqh (jurisprudence). As a field of study, Qiraat (Quranic reading) plays a significant role in Islamic Fiqh by way of shaping the opinions and views of the fuqaha’ (jurists). Nevertheless, some fuqaha’ are less familiar with Qiraat as a study which has thus led to some confusion and ambiguity on the matter. It was even suggested that the differences of fiqh found within the madzhabs (sects) are based on the fuqaha’s own Qiraat. Thus this paper is a discussion on the differences of wajh Qiraat within the farsh letters as found among the Qiraat scholars. This paper also analyses the relationship and influence of the Qiraat readings among the fuqaha when it comes to deriving a hukm (principle), particularly on fiqh ibadah (the laws of worship). As such, this significant study sheds light into the approach used by the fuqaha’ when it comes to extracting and deriving laws and principles based on the different Qiraat readings. The objectives of this study are to investigate the extent and role of Qiraat, to analyse and observe the relationship between Qiraat readings of the fuqaha and its relationship to the hukm. This study is based entirely on library research. Overall, the findings show that Qiraat is undoubtedly important; the differences in Qiraat have a major impact in the way that the various Islamic Fiqh were derived from the Qur’anic verses. Nevertheless, the chosen Qiraat readings by Fuqaha, on the other hand, do not play a major role in determining the fiqh within the various sects; instead the wajh Qiraat plays a major role within their respective sects. However, in some circumstances, the chosen Qiraat readings do sometimes become a source which a hukm is decided within their sects, and vice versa. It is hoped that this study becomes a pioneer for other researchers to conduct a more in-depth study on the sciences of Qiraat by exploring it critically within the various perspectives of the Islamic discipline. It is hoped that it can be analysed, studied, understood and implemented in the field of teaching and learning, in line with its importance within the other branches of Islamic discipline. It is hoped that as a study, it can be further expanded and remain significant to the Islamic scholars and the community at large. Keyword: Qiraat Mutawatirah, Fiqh, Qiraat, fuqaha‘   Penulisan ini bertujuan merungkai hubungan rapat Qiraat dalam disiplin ilmu Islam terutamanya ilmu Fiqh. Qiraat menjadi salah satu faktor yang dominan terutamanya dalam mencorakkan perbezaan hukum Fiqh Islami dalam kalangan Fuqaha’. Namun masih terdapat kalangan yang kurang mengetahui dan memahami hakikat kewujudan ilmu Qiraat sehingga menimbulkan kekeliruan dan kesamaran mengenainya bahkan wujudnya pendapat menyatakan bahawa hukum fiqh yang diinstibatkan dalam mazhab adalah berdasarkan daripada Qiraat yang dibaca oleh kalangan fuqaha itu sendiri. Justeru kajian ini akan menyentuh dan membincangkan perbezaan wajh qiraat yang terdapat pada farsh huruf dalam kalangan ulama Qiraat. Dalam masa yang sama, kajian ini juga akan menyingkap dan menganalisis perkaitan dan pengaruhnya terhadap pengeluaran hukum oleh kalangan Fuqaha’ terutama ayat-ayat al-Quran yang melibatkan fiqh ibadat. Kajian ini penting demi memahami keadaan sebenar bagaimana kalangan Fuqaha mengeluarkan hukum fiqh berdasarkan perbezaan Qiraat. Objektif kajian ialah mengkaji sejauhmana perkaitan dan peranan Qiraat pada hukum fiqh, menganalisis dan menilai sejauh mana pertalian bacaan Qiraat yang dibaca Fuqaha’ dengan hukum yang diinstibatkan oleh Fuqaha.’ Secara keseluruhannya, kajian ini dijalankan berdasarkan kajian ke perpustakaan sepenuhnya. Ternyata dapatan hasil kajian ini merumuskan bahawa perbezaan Qiraat pula memberi impak yang besar dalam mencorakkan hukum fiqh dalam ayat al-Quran. Bacaan ‘Qiraat PilihanFuqaha‘ pula tidaklah menjadi faktor utama mempengaruhi hukum fiqh mazhab yang diasaskan oleh mereka bahkan fuqaha hanya menjadikan wajh Qiraat itu sebagai platform utama dalam menentukan hukum fiqh dalam mazhab yang diasaskan mereka. Namun tidak dinafikan juga, bacaan ‘Qiraat Pilihan Fuqaha‘ itu kekadang menjadi sebab penentuan hukum bagi mazhab mereka dan kekadangnya sebaliknya. Kajian ini diharap menjadi perintis kepada pengkaji yang lain untuk lebih prolifik mengenai ilmu Qiraat dalam membahaskannya dari pelbagai sudut disiplin ilmu Islam secara lebih kritis supaya ia dapat ditelaah, dikaji, difahami, diperkasai dan diimplimentasikan dalam aspek pengajaran dan pembelajaran sejajar dengan kepentingannya terhadap cabangan ilmu-ilmu Islam yang lain agar terus berkembang dan bertapak pada kaca mata Ilmuan Islam secara khusus dan masyarakat sejagat secara umumnya.   Kata Kunci: Qiraat Mutawatirah, Fiqh, Qiraat, fuqaha‘.


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