bluuebunny/crossref_metadata_2025 huggingface dataset:
Controlling Crystallization, Mechanical Properties and Heat Resistance of
Poly(L-lactide)-b-polyethylene glycol)-b-poly(L-lactide) Bioplastic by Melt
Blending with Low Molecular Weight Poly(D-lactide)/Poly(L-lactide) Mixtures
Authors: Baimark Yodthong , Phromsopha Theeraphol
Published: June 2022

The crystallization behaviour, mechanical properties and heat resistance were determined for mixtures
of poly(L-lactide)-b-polyethylene glycol-b-poly(L-lactide) (PLLA-PEG-PLLA) blended with
poly(D-lactide)/poly(L-lactide) with m.w. of 6,000 g/mol (PDLA6k/PLLA6k). These blends were
prepared by melt blending. PLLA-PEG-PLLA/PDLA6k/PLLA6k ratios of 90/10/0, 90/7.5/2.5, 90/5/5,
90/2.5/7.5 and 90/0/10 %wt. were investigated. PLLA-PEG-PLLA/PDLA6k and
PLLA-PEG-PLLA/PLLA6k blends were also prepared for comparison. The presence of
PDLA6k/PLLA6k mixture improved crystallization and heat resistance of PLLA-PEG-PLLA and
this improvement was related to increased PDLA6k content. However, the 90/10/0 blend film was
brittle but 90/7.5/2.5, 90/5/5, 90/2.5/7.5 and 90/0/10 blend films were not. The PLLA6k blending
enhanced film flexibility. The results suggested that the PLLA-PEG-PLLA blends with controllable
mechanical properties and heat resistance can be prepared by varying the PDLA6k/PLLA6k ratio for
use as flexible and heat-resistant biodegradable bioplastics.
Government revenue and spending nexus in regional Indonesia: Causality approach
Authors: Febriani Ratu Eva , Rambe Roosemarina Anggraini
Published: June 2022

This study aims to test the hypothesis that explains the relationship between tax revenue and government spending in six Indonesian regions. Furthermore, the units of analysis were districts and cities in each region from 2006 to 2017, and a Granger panel causality approach was used. The results showed five experienced bidirectional causalities between tax revenues and local government spending out of the six regions, namely Java, Sumatra, Kalimantan, Sulawesi, and the Bali & Nusa Tenggara. Also, there was fiscal synchronisation in five regions, while the tax-spend hypothesis applies in the Papua & Maluku regions. Therefore, the local governments in these regions need to be careful in deciding actions related to increasing revenue. This can be achieved through the tax sector's optimisation and expenditure increment by encouraging public spending from the administration.
Uncovering the determinants of environmentally-friendly apparel purchase intention in Indonesia: Incorporating environmental concern and knowledge into the theory of planned behavior
Authors: Rizkalla Nosica , Lestari Elissa Dwi , Arinto Boby , Purnamaningsih Purnamaningsih , Sulistyarini Niken
Published: June 2022

The clothing industry is a high-growth industry that is attractive to be occupied by the business. However, behind its appeal, this industry brings harmful impacts to the environment. The fashion industry is considered the 2nd most destructive industry in the world. Environmental damage due to industry occurs not only in the production process but also in consumption and disposal. As the growth of this industry cannot be separated from consumer intervention, efforts to improve the environmental impact caused by this industry also require consumers’ role. Consumers can improve the environment through their consumption choices, such as replacing the usual products with more sustainable products. Therefore, it is essential to discover what factors can encourage consumers to consume more environmentally friendly apparel. This study intends to explore consumer motivation in deciding to buy environmentally friendly apparel by applying the extended theory of planned behavior. As an extension, this study includes two additional variables, namely environmental concern and environmental knowledge. This study involved 407 respondents who have followed some environmentally friendly apparel brands. The collected data would then be analyzed with smartPLS 3.0. The result of the study showed that all variables are proven to be significant in influencing consumers’ purchase intention for environmentally-friendly apparel, except for environmental concern, which influence is indirect through attitude. The result of this study gives new insight into what shapes the intention of buying environmentally-friendly apparel.
The impact of the Covid-19 pandemic on the hotel industry in Indonesia
Authors: Choirisa Septi Fahmi
Published: June 2022

The Hotel Industry has had numerous detrimental consequences from the worldwide crisis of the Covid-19 pandemic. This study aims to examine the impact of the Covid-19 pandemic on hotel management and operations in Indonesia. A qualitative approach with semi-structured in-depth interviews was conducted with 13 managerial level participants in the hotel industry. This paper reveals that health protocols, pricing strategies, and cost-saving alter everyday management strategies. This study contributes to the management and operations strategies literature by untangling the dynamics of the pandemic situation. Furthermore, the suggested areas can help hotels recover from the Covid-19 pandemic by expanding the knowledge base. This study gives practical insight to support the hotel sector’s development and sustainability
Climate change disclosures by public sector organisations
Authors: Ackers Barry , Adebayo Adeyemi
Published: June 2022

Global warming and increasingly volatile weather patterns, arguably caused by anthropogenic climate change, is one of the defining challenges facing the world today. It is therefore imperative that organisations proactively respond by not only disclosing the impact of climate change on their operations, but also by describing their initiatives to combat climate change. Against this backdrop, and since public sector organisations utilise public funds, we argue that public sector organisations should not only account to the public about their stewardship of public resources, but are also obliged to explain how they are safeguarding the public by acknowledging and combatting climate change. Our study therefore explores the disclosure of climate related activities from a purposively selected sample of government departments and organisations in South Africa, a country that has been lauded for the quality of corporate governance processes. We developed a climate change disclosure quality (CCDQ) index to assess the climate change disclosures of these public sector organisations. The CCDQ index applied to the most recent publicly available annual/integrated reports of the selected public sector organisations, took six key disclosure elements into account. While our results reveal that the majority of public sector organisations disclose climate related issues, not all do. Moreover, the extent and scope of these disclosures vary significantly. We accordingly recommend that a framework, utilising the disclosure elements described in this paper, be developed which could be applicable to both private and public sector organisations.
Adorno, Lukács y las interpretaciones metafísicas del materialismo marxiano
Authors: Escuela Cruz Chaxiraxi M.ª
Published: June 2022

Este trabajo propone una lectura de los momentos de continuidad y diferencia que existen entre las propuestas de recuperación de la filosofía marxista de Th. W. Adorno y G. Lukács, prestando especial atención a la manera en la que ambos desarrollan su teoría de la cosificación y el fetichismo de la mercancía.
Instructional Designers as “First Responders” Helping Faculty Teach in the Coronavirus Crisis
Authors: Abramenka-Lachheb Victoria , Lachheb Ahmed , De Siqueira Amaury Cesar , Huber Lesa
Published: June 2022

Many higher education institutions in the United States had to implement a strategy of rapid pivoting from face-to-face to online learning in response to the Spring 2020 global COVID-19 pandemic. Face-to-face learning posed a high risk of uncontrolled widespread of the virus, thus, classes had to switch rapidly to a remote mode of instruction that leveraged online learning technologies. The rapid pivoting from face-to-face to online learning posed unprecedented challenges. It is widely accepted among the communities of instructional designers, educators who teach online, and higher education administrators that designing online courses requires more than mirroring face-to-face courses in the online environment (Watson et al., 2017). Instructional strategies adopted in face-to-face instruction are not as effective in online learning environments as research has shown (Baldwin et al., 2018), and as students have remarked[1]. The application of instructional strategies tailored for online learning ensures meaningful learning experiences (Watson et al., 2017); thus, a quality online learning experience. For example, quality online learning experiences do not require weekly meetings as students live in different time zones and adopt an asynchronous approach to learning to ensure flexible and equitable access to course materials. However, providing faculty support for the rapid pivot from face-to-face to online learning with limited time and instructional design resources is uncharted territory. Faculty and instructional designers were challenged to support quality learning experiences through online course design in less than two weeks at many campuses across the country.
Studying the Academic Procrastination Theme with Psychodrama: A Case Report
Authors: UYAR Nilüfer , ŞİMŞEK Bircan , GÜÇ Ebru
Published: June 2022

In this study, it is aimed to be evaluated qualitatively of the sharing and awareness of the case participating in the academic procrastination psychodrama experience group within the framework of the literature on academic procrastination. The case is a 30-year-old male, married and living in Eskişehir with his family and is at the dissertation stage of his doctoral education. The psychodrama experience group was planned as 10 sessions of approximately two and a half hours a week and the application were carried out at Psychological Counseling and Guidance Center of Anadolu Unıversıty in 2018-2019 Spring term. The sessions were aimed at increasing the awareness of the participants about themselves and gaining insight into their academic procrastination. The case joined the group in the second session and continued with the group until the end of the group process. In “seed planting” game held in the second session, the case has determined “achieving its professional goals” as its short-term goal and “reaching its ideals” as its long-term goal. During the psychodrama experience group process, it was observed that the case gained significant awareness about himself and his academic procrastination. In the light of the findings, it can be stated that the case made significant gains from this study and therefore psychodrama practice is an effective method for young adults to gain awareness about themselves and to gain insight about their academic procrastination.
Pemanfaatan Mikrohidro Air Terjun Lawang Bromo Untuk Menerangi Dusun Tanpa Listrik di Kabupaten Probolinggo
Authors: Albar Syarief , Windarta Jaka
Published: June 2022

Desa Ngepung Kecamatan Sukapura Kabupaten Probolinggo adalah satu desa yang belum mendapatkan aliran listrik dari PLN karena letak geografinya yang terletak dibawah kaki gunung Bromo. Kebutuhan energi dimasa pandemi ini mendorong diadakannya upaya lebih untuk tetap bergulirnya roda ekonomi. Salah satu upaya adalah dengan memanfaatkan air terjun dan sungai untuk digunakan sebagai pembangkit listrik mikrohidro yang lebih dikenal dengan PLTMH dan tempat wisata air terjun lawang bromo. PLTMH yang akan dibangun rencananya adalah bagian dari CSR PT. POMI – PAITON ENERGY dengan nama program Rumah Belajar Energi 3, dengan kapasitas 14,6 KW dan mengunakan model turbin Kaplan. Pemanfaatan PLTMH/mikrohidro dan air terjun akan dikelola oleh BUMDES agar kelangsungan bisa terjaga dan peran serta masyarakat tetap terwujud.
Pengaruh Pengurangan Laju Alir Udara Proses pada Unit Secondary Reformer (103-D) terhadap Konsumsi Energi Pada Pabrik Amoniak Pupuk Kaltim 5
Authors: Setyanto Fauzandy Husna , Manapa Puja Chrisdianto , Widayat Widayat
Published: June 2022

Secondary reformer merupakan alat yang berfungsi untuk mengonversi dari metana (CH₄) menjadi syn gas (H₂). Gas metana akan bereaksi dengan oksigen (O₂) yang berasal dari udara atmosfer untuk membentuk H₂ yang nantinya akan disintesis menjadi amoniak pada unit ammonia converter. Sementara itu gas metana yang tersisa akan dimanfaatkan kembali sebagai secondary fuel pada primary reformer, energi yang dihasilkan dari reaksi pembentukan syn gas pada secondary reformer ini kemudian digunakan untuk membangkitkan saturated steam pada unit waste heat boiler. Studi kasus ini dilakukan untuk mengetahui pengaruh pengurangan laju alir udara pada secondary reformer terhadap jumlah methane leak, energi, amoniak yang dihasilkan, dan optimasi proses suplai secondary fuel ke primary reformer. Penurunan laju alir pada secondary reformer (103-D) akan menyebabkan beberapa hal yaitu naiknya jumlah methane leak pada outlet secondary reformer, adanya peningkatan produk secondary fuel methane, adanya penurunan produk saturated steam pada waste heat boiler (101-C), penurunan pada produk amoniak yang dihasilkan pada ammonia converter (122-C2), dan konsumsi energi yang dibutuhkan per ton amoniak meningkat seiring dengan pengurangan laju alir udara dengan rata-rata peningkatan konsumsi energi sebesar 0,15 MMBTU/ton.
‘Bridge’ to ‘Fence’ A Maritime History of the Straits of Malacca
Authors: Gin Ooi Keat
Published: June 2022

Oceans, seas, straits and other bodies of water may pose as dividers between lands, but at the same time, function as bridges interconnecting diverse territories. The latter ascribed a positive attribute in characterizing oceans, seas, straits as linkages between islands, and islands with continents. This study emphasizes the history of the Straits of Malacca and its role to the dynamic of world interconnecting networks. The Straits of Malacca (hereinafter the Straits) in the midst of Southeast Asia is a medium of interaction that enjoins the Malay Peninsula (present day West/Peninsular Malaysia) to other parts of the region spanning across to distant Java and Borneo. The Straits, from time immemorial, has functioned as a natural ‘bridge’ of the Malay World, referring to the Malay Archipelago or Nusantara, that largely comprised the greater expanse of insular Southeast Asia.  This ‘bridge’ was even more significant in the period prior to the nineteenth century, being apparent as early as the mid-seventh century CE
Indigenous Knowledge About Disaster in Folk Prose Narratives of Indonesian Coast
Authors: Nurislaminingsih Rizki , Rochwulaningsih Yety
Published: June 2022

Indonesian people consists of various ethnic groups living in urban, rural, mountainous, and coastal areas. The people who inhabit each region have stories that describe the topography of the region and its culture. An example is people from coastal areas. The location of their residences which are close to the ocean makes them experts in recognizing natural signs and disaster characteristics from the sea. Their knowledge is shared with the social environment by verbal. One type of oral tradition originating from the natives is folk prose narratives such as legends, fairy tales, and stories of the origin of a place. This study aims to explore indigenous knowledge in folk prose narratives from the Indonesian coast. The results showed that the knowledge contained in folk prose narratives was how to recognize disaster signs from the sky (roaring wind, lightning flashes, pitch-dark sky, black cloud, and very heavy rain), disaster signs from the sea (low tides, hurricanes), ways to save yourself (climbing trees, climbing hills, and going to higher ground), and disaster prevention (not killing animals and cutting down trees carelessly). The conclusion is indigenous knowledge about disasters in folk prose narratives from the Indonesian coast is how to recognize natural signs, how to save themselves, and mitigation. The findings in this study are that Indonesian ancestors had knowledge in making flying vehicle and making fish feed on natural ingredient (chicken feathers).
If the I is a Point, How Can It have a Direction? Fichte’s Two-Stage Conceptualization of the Absolute I
Authors: Oren Yehuda
Published: June 2022

Fichte claims in Section 5 of the Grundlage der gesamten Wissenschaftslehre (GWL) that the absolute I contains a difference between two directions. In this paper, I argue that this specific claim complements, rather than contradicts, his general position in Section 1, according to which the absolute I is a simple identity or a point. I first show that we can identify a version of what I call Fichte’s Two-Directions Theory in texts written both before and after the GWL. I term this version his Two-Series Theory. Drawing on this reading, I demonstrate, in contrast to previous research, that Fichte consistently formulates the absolute I in a twofold manner: as a pure act that precedes any difference and as a proposition that contains a relation. I further argue that Fichte’s treatment of the absolute I as a simple unity and as a unity of two directions maps onto two stages within his philosophical investigation. On my account, Fichte seeks to comprehend the absolute I by considering the I’s activity both as it is in itself and as it presents itself to thought.
Between Starvation and Spoilage: Conceptual Foundations of Locke’s Theory of Original Appropriation
Authors: Olsthoorn Johan
Published: June 2022

This paper reconstructs the conceptual foundations of Locke’s unilateralist theory of original appropriation through a critical comparison with the rival compact theories of Grotius and Pufendorf. Much of the normative and conceptual framework of Locke’s theory is common to theirs. Integrating his innovative doctrines on labour and natural self-proprietorship into this received theoretical framework logically required Locke to make several conceptual amendments. I highlight three all but overlooked revisions: (i) an unusually broad conception of labour; (ii) a reduction of mere use-rights to property rights; and (iii) a novel non-self-preservationist interpretation of the divine authorization to use natural resources in common. The reconceptualization of ‘labour’ is theoretically the most fundamental, underpinning the other two. My contextual reconstruction enhances our grasp of the structure of Locke’s theory of original appropriation. It also reveals Locke’s main objection to compact theories to be an external one, hinging on idiosyncratic conceptualizations of key notions.
“You can’t start a fire without a spark”. Enjoyment, anxiety, and the emergence of flow in foreign language classrooms
Authors: Dewaele Jean-Marc , MacIntyre Peter
Published: June 2022

The present study adopted a mixed-methods approach using a convergent parallel design to focus on the role that positive and negative emotions have in the Foreign Language (FL) classroom on the ontogenesis of positive flow. Participants were 1,044 FL learners from around the world. They provided quantitative and qualitative data on FL enjoyment (FLE), classroom anxiety (FLCA) and experience of flow via an on-line questionnaire (Dewaele, Jean-Marc & Peter D. MacIntyre. 2014. The two faces of Janus? Anxiety and enjoyment in the foreign language classroom. Studies in Second Language Learning and Teaching 4. 237–274). FLE was a significantly stronger predictor of frequency of flow experience than FLCA. Further statistical analyses revealed that flow experiences are typically self-centred, infrequent and short-lived at the start of the FL learning journey and when the perceived social standing in the group is low. They become an increasingly shared experience, more frequent, stronger and more sustained as learners reach a more advanced level in their FL. What starts as an occasional individual spark can turn into a true fire that extends to other group members. The findings are illustrated by participants’ reports on enjoyable episodes in the FL classroom in which some reported complete involvement in an individual or collective task, merging of action and awareness, joyful bonding with classmates, intense focus and joy, loss of self-consciousness, sense of time and place.
The Effect of Spousal Loss on the Cognitive Ability of the Elder
Authors: Lee Hwanoong , Ko Changsu
Published: June 2022

Given that economic growth is associated with increased life expectancy, declines in cognitive ability among the elder is a critical problem across the developed world. In this paper, we analyze the causal effect of the death of a spouse on the surviving spouse’s cognitive ability using the fixed effect model. The reliability of the estimates is enhanced by robustness checks, such as an event study model, to attend to potential threats to identification. Results show that, on average, spousal loss significantly reduces the cognitive functioning of the surviving spouse. We also study heterogeneity in the effect of spousal loss, finding that co-residing with children greatly mitigates the negative effect of bereavement.
Interference by macroprolactin in assays for prolactin: will the In Vitro Diagnostics Regulation lead to a solution at last?
Authors: Fahie-Wilson Michael N. , Cobbaert Christa M. , Horvath Andrea R. , Smith Thomas P.
Published: June 2022

Cross reactivity with high molecular weight complexes of prolactin known as macroprolactin is a common cause of positive interference in assays for serum prolactin. All prolactin assays currently available are affected with 5–25% of results indicating hyperprolactinaemia falsely elevated due to macroprolactinaemia – hyperprolactinaemia due to macroprolactin with normal concentrations of bioactive monomeric prolactin. Macroprolactinaemia has no pathological significance but, if it is not recognised as the cause, the apparent hyperprolactinaemia can lead to clinical confusion, unnecessary further investigations, inappropriate treatment and waste of healthcare resources. Macroprolactinaemia cannot be distinguished from true hyperprolactinaemia on clinical grounds alone but can be detected by a simple laboratory test based on the precipitation of macroprolactin with polyethylene glycol. Laboratory screening of all cases of hyperprolactinaemia to exclude macroprolactinaemia has been advised as best practice but has not been implemented universally and reports of clinical confusion caused by macroprolactinaemia continue to appear in the literature. Information provided by manufacturers to users of assays for prolactin regarding interference by macroprolactin is absent or inadequate and does not comply with the European Union Regulation covering in vitro diagnostic medical devices (IVDR). As the IVDR is implemented notified bodies should insist that manufacturers of assays for serum prolactin comply with the regulations by informing users that macroprolactin is a source of interference which may have untoward clinical consequences and by providing an estimate of the magnitude of the interference and a means of detecting macroprolactinaemia. Laboratories should institute a policy for excluding macroprolactinaemia in all cases of hyperprolactinaemia.
Applying spline-based phase analysis to macroeconomic dynamics
Authors: Lyudmila Gadasina , Lyudmila Vyunenko
Published: June 2022

The article uses spline-based phase analysis to study the dynamics of a time series of low-frequency data on the values of a certain economic indicator. The approach includes two stages. At the first stage, the original series is approximated by a smooth twice-differentiable function. Natural cubic splines are used as an approximating function

y

y

. Such splines have the smallest curvature over the observation interval compared to other possible functions that satisfy the choice criterion. At the second stage, a phase trajectory is constructed in

(

t
,
y
,
y
′

)

\left(t,y,y^{\prime} )

-space, corresponding to the original time series, and a phase shadow as a projection of the phase trajectory onto the

(

y
,
y
′

)

(y,y^{\prime} )

-plane. The approach is applied to the values of GDP indicators for the G7 countries. The interrelation between phase shadow loops and cycles of economic indicators evolution is shown. The study also discusses the features, limitations and prospects for the use of spline-based phase analysis.
Löwner chains and a subclass of bi-univalent functions
Authors: Najafzadeh Shahram , Haji Hakimeh , Rahmatan Hormoz
Published: June 2022

In this paper, we give characterization of subclasses of bi-univalent functions and also consider bi-starlike functions on the unit disk in ℂ in terms of Löwner chains.
Probiotic administration enhanced antitrypanosomal effects of diminazene aceturate in dogs experimentally infected with Trypanosoma brucei brucei
Authors: Kolawole Bamidele Jonathan , Nwoha Rosemary Ijeoma Ogechi , Erin Juwon Pius , Orakpoghenor Ochuko
Published: June 2022

Objectives

This study demonstrated the enhancing actions of probiotic on the antitrypanosomal effects of diminazene aceturate in dogs experimentally infected with Trypanosoma brucei brucei.

Methods

Twenty (20) apparently healthy adult local dogs of both sexes were randomly divided into five groups each containing four dogs. Group I were uninfected and untreated while groups III, IV and V were infected. Groups II, III, IV and V were administered multispecies probiotic (MSP) and/or diminazene aceturate (DA). Parasitaemia was determined, clinical signs recorded and blood collected for haematology.

Results

Results revealed T. b. brucei prepatent periods of 4.75 ± 0.25, (4–5) days and significant decrease of parasitaemia, clinical signs and mortality in groups IV and V compared to group III. Mortalities of 100% (group III), 25% (group IV) and 0% (group V) were recorded. Mean packed cells volume, haemoglobin concentration and red blood cells count showed no significant difference in groups I, II, and V, but were significantly decreased in groups III and IV post-treatment.

Conclusions

The administration of MSP to infected dogs enhanced the antitrypanosomal effects of diminazene aceturate.
A history of the LBK in the central Polish lowlands
Authors: Whittle Alasdair , Marciniak Arkadiusz , Pyzel Joanna , Krueger Marta , Lisowski Mikolaj , Ramsey Christopher Bronk , Dunbar Elaine , Barclay Alistair , Bayliss Alex , Gaydarska Bisserka
Published: June 2022

A new chronological study of the LBK in the central Polish lowlands shows that it emerged later, lasted for a shorter period, and ended sooner than has been supposed up till now. LBK communities emerged, probably in the middle of the 53rd century cal BC, to form an enclave in the central Polish lowlands, probably as a result of colonisation from loess areas in the south of Poland. Settlement steadily intensified throughout the 52nd century cal BC, reaching its peak at the beginning of Phase III. In the middle of the 51st century cal BC there followed an abrupt decline or collapse, and LBK occupation of the lowlands had probably ended completely by the end of that century. There followed an appreciable gap before the re-emergence of settlement in the form of the Late Band Pottery culture (LBPC), characterised by significantly sparser settlement, changed dwelling structures and contacts with hunter-gatherer groups. A start to the wider task of comparing the situation in the central Polish lowlands with other regional sequences is made principally by reviewing similar formal modelling of a post-LBK hiatus in the Rhineland. Possible factors causing the LBK decline are discussed, including climatic downturn, population boom and bust, warfare, cultural malaise, disease and internal social conflict. None of these is overwhelmingly convincing on its own, and one of the many challenges for continuing research in the Polish lowlands and beyond will be to find further specific evidence to decide which of this range of possibilities is most plausible in specific contexts.
Adsorption of copper ions in water by adipic dihydrazide-modified kapok fibers
Authors: Dalgic Mete Sungur , Palantöken Sinem , Bethke Kevin , Rademann Klaus
Published: June 2022

Kapok fibers (Ceiba pentandra) were modified for the removal of copper ions from aqueous solutions through adsorption. In this fast and facile method, the polysaccharide-like groups of kapok were oxidized with potassium periodate. The novel modification is the loading of the fibers with adipic dihydrazide (ADH) which contain nitrogen and oxygen atoms for heavy metal ion binding. Adsorption experiments have been carried out and analyzed via atom absorption spectroscopy and ultraviolet/visible spectroscopy. In preliminary adsorption experiments, different kapok-based materials have been analyzed on their adsorption capacity and removal efficiency via atom absorption spectroscopy. ADH-modified fibers showed the best results and an increase of copper removal efficiency by 30% in comparison to untreated kapok fibers and superior adsorption capacity compared to kapok fibers loaded with oxalic dihydrazide (ODH). Moreover, the impact of initial concentration and contact time on the adsorption capacity and on the removal efficiency values of the ADH-modified kapok fibers has been studied. Another comparison of the ADH-modified fibers with raw kapok which was cleaned with Milli-Q water, dichloromethane and ethylene glycol showed that the new adsorbents are best suited for copper solutions with concentration values of under 10 mg/L. The heavy metal adsorption experiments were analyzed through both isotherm models Langmuir and Freundlich. The Langmuir model is found to be a suitable model for copper ions. The value of the maximum adsorption capacity is 4.120 mg/g. The ADH-modified kapok fibers were characterized with attenuated total reflection infrared (ATR-IR) spectroscopy, magic-angle spinning nuclear magnetic resonance (MAS-NMR) spectroscopy and scanning electron microscopy (SEM).
Residuos sólidos urbanos y economía circular en Pachuca, Hidalgo, México
Authors: Ceballos Pérez Sergio Gabriel , Brambila Paz José de Jesús , Pérez Cerecedo Verónica
Published: June 2022

Los residuos sólidos urbanos (RSU) representan una de las fuentes de contaminación que pueden generar efectos nocivos como plagas, malos olores, focos de infección y transmisión de enfermedades. El manejo integral de residuos consiste en la recolección, separación, tratamiento y confinación en rellenos sanitarios. No obstante, la economía circular (EC) promueve la eficiencia del uso de materiales y energía por medio de las 5R. El objetivo de este artículo fue conocer cómo se lleva a cabo el manejo de los RSU e identificar la posibilidad de transitar hacia una EC en la ciudad de Pachuca. La metodología consistió en un estudio de caso descriptivo, utilizando entrevistas semiestructuradas y dirigidas, reconocimiento en campo y recopilación de información estadística. Como resultado se obtuvo que la generación de RSU en Pachuca es de las más altas en México, que el aprovechamiento de estos residuos es mínimo y que existen pocos proyectos de valorización.
Physical Simulation Experiment on the Failure Evolution Process and Failure Mode of Soft Surrounding Rock in a Deep Roadway
Authors: Guo Peng , Fan Jun-qi , Shi Xiao-yan , Wu Qing-xiang
Published: June 2022

Large deformation of surrounding rock is one of the major disasters that cannot be prevented in deep underground engineering. Several arch changes or even landslides may occur if the management is ineffective. In this study, an indoor model experiment is conducted using a similar geotechnical multifunction load simulation device and a surrounding rock strain and displacement monitoring system. The failure evolution process of surrounding rocks and the variation law of displacement and stress of a deep underground roadway under different burial depths are studied. The critical components for preventing large deformations in underground engineering have been identified. Model test results show that the designed deep roadway model loading system can meet the requirements of uniform loading in simulating different deep roadway loads and can satisfactorily realize cascade loading of various surrounding rocks in a deep roadway. The stress and displacement in the surrounding rock can also be efficiently measured with by the designed measuring device. The similarity test of physical simulation indicates that the instability risk of a deep roadway, especially the collapse disaster in the sidewall, is greater with the increase in depth when no support exists. The collapsed area of the surrounding rock gradually increases with the increase in the burial depth of the roadway. In the model test, no evident convergence deformation is observed in the surrounding rock of the roadway when the simulated depth is less than 800 m. The deformation of the sidewall and the arch waist increases with the increase in burial depth.
Sperm DNA Links from Sperm to Ovum to Implant Genetic Changeability: an Overview
Authors: Mishra Sanjay , Mani Tiwari Amit Kumar , B. Singh Ram , A. Mahdi Abbas
Published: June 2022

Sperm DNA disintegration is known to cooperate male fertility. The data bring about that sperm DNA cleavage can be competently treated with orally administered antioxidant during a relatively short moment period. It is an accepting thought that the two types of DNA become visible to be distinctive and autonomously packaged molecules; though, investigation has established the symbiotic nature of these structures in contributing to male infertility. Data should continue to be gathered to ascertain strong correlation between conventional semen examination parameters and sperm DNA integrity; this information remains contentious and inadequate in clinical practice until certain novel techniques for the diagnosis and treatment of sperm DNA can be established. Rather more modern technology should be employed to associate such information into practical clinical awareness. This overview compiles certain specific reports pertaining to studies on sperm DNA physiology, biochemistry and molecular biology to provide further new insights into establishing hypothesis that sperm DNA integrity is both enormously fragile and remarkably significant for male fertility. Keywords: Apoptosis; Male infertility; Sperm DNA
Misuse and development of resistance towards antibiotics: A survey among 1000 patients in Gopalganj district in Bangladesh
Authors: Khan Md. Roich , Hossain Md. Rakib , Al Amin Mostafa , Ara Khan Shams , Torequl Islam Muhammad
Published: June 2022

The current study was done to view the level of knowledge about antibiotic misuse and the development of antibiotic resistance among the general people in the District Gopalganj, Bangladesh. For this purpose, questionnaires were prepared and distributed randomly among 1000 abusers within the age range 15 to 80 years. To get appropriate responses, some literate volunteers were assigned who directly collected data. Results suggest that males were more misusers than the females. Second generation antibiotics are the frequently used antibiotics among the patients. More patients were found using antibiotics without clinical diagnosis and in an incomplete dose fashion. More studies are necessary to find out the actual facts on antibiotic misusages and the subsequent gaining of antibiotic resistance. Key words: Antibiotics; Misuse; Resistance; Health care.
A high-resolution gridded inventory of coal mine methane emissions for India and Australia
Authors: Sadavarte Pankaj , Pandey Sudhanshu , Maasakkers Joannes D. , van der Gon Hugo Denier , Houweling Sander , Aben Ilse
Published: June 2022

Coal mines are globally an important source of methane and also one of the largest point sources of methane. We present a high-resolution 0.1° × 0.1° bottom-up gridded emission inventory for methane emissions from coal mines in India and Australia, which are among the top 5 coal producing countries in 2018. The aim is to reduce the uncertainty in local coal mine methane emissions and to improve the spatial localization to support monitoring and mitigation of these emissions. For India, we improve the spatial allocation of the emissions (CH4 emissions: 825 [min: 166 – max: 1484] Gg yr−1) by identifying the exact location of surface and underground coal mines and we use a Tier-2 Intergovernmental Panel on Climate Change (IPCC) methodology to estimate the emissions from each coal mine using country-specific emission factors. For Australia (CH4 emissions: 972 [min: 863 – max: 1081] Gg yr−1), we estimate the emission for each coal mine by distributing the state-level reported total emissions using proxies of coal production and the coal basin-specific gas content profile of underground mines. Comparison of our total coal mine methane emission from India with existing global inventories showed our estimates are about a factor 3 lower, but well within range of the national Indian estimate reported to United Nations Framework Convention on Climate Change. For both the countries, the new spatial distribution of the emissions show large difference from the current global inventories. Our improved emissions dataset will be useful for air quality or climate modeling and while assessing the satellite methane observations.
Crear opinión pública para desarmar al enemigo político en la Mallorca de inicios del siglo XVIII
Authors: Coll-Coll Ana-María
Published: June 2022

En este trabajo analizamos la opinión crítica creada y difundida por distintas facciones de poder en Mallorca a finales de una época de transición entre dos sistemas de gobierno. El proceso judicial abierto tras la agresión física sufrida por el presunto autor de una sátira nos permite conocer la existencia de enfrentamientos de carácter social y político: austracistas contra borbónicos, mallorquines contra forasteros, y poder civil contra poder militar. También nos permite observar cómo se difunde la literatura crítica, y cómo se manipula la opinión pública.
Las enfermedades infecciosas en la Prehistoria: diversos casos de estudio
Authors: León-Cristóbal Alejandro
Published: June 2022

Las enfermedades infecciosas tuvieron una gran presencia durante la Prehistoria, como revela en ocasiones el registro arqueológico. La mayoría de procesos infecciosos no dejan huella en el aparato óseo, pero las excepciones que sí lo hacen permiten conocer más acerca de una de las principales causas de muerte en la antigüedad. Tradicionalmente se ha considerado que muchas de las enfermedades actuales tuvieron su origen a raíz del Neolítico, sin embargo, diversas evidencias demuestran que algunas de estas son tan antiguas como la propia evolución humana. Parece evidente que, por un lado, con la adopción de la agricultura y de la ganadería, las poblaciones humanas crecieron exponencialmente en número, posibilitando una mayor transmisión de virus, bacterias y parásitos; y, por otro, adquirieron microorganismos nuevos procedentes del ganado tras la llamada revolución de los productos secundarios. Este sería el origen de algunas enfermedades potencialmente peligrosas para el ser humano.
Moradiellos, Enrique, Quo vadis, Hispania? Winston Churchill y la guerra civil española (1936-1939). Discurso leído el día 28 de noviembre de 2021 en el acto de su recepción por el Excmo. Sr. D. Enrique Moradiellos García y contestación por el Excmo. Sr. D. Juan Pablo Fusi Aizpurúa, Madrid, Real Academia de la Historia, 2021, 198p. ISBN: 978-84-15069-92-8. 12,00€
Authors: Olábarri-Gortázar Ignacio
Published: June 2022

Book Review
Digital News Report España 2022. Reconectar con las audiencias de noticias
Authors: Vara-Miguel Alfonso , Amoedo-Casais Avelino , Moreno-Moreno Elsa , Negredo-Bruna Samuel , Kaufmann-Argueta Jürg
Published: June 2022

El Digital News Report España 2022 es la 9.ª edición del informe anual más global sobre consumo de noticias, elaborado por la Facultad de Comunicación de la Universidad de Navarra, en coordinación con el Reuters Institute de la Universidad de Oxford
Synthesis and cytotoxicity of new 4-aza-2,3-didehydropodophyllotoxins
Authors: Hang Nguyen Thi Thuy , Yen Tran Thi , Hoang Vu Dinh , Quoc Anh Ngo
Published: June 2022

Five new 4-aza-2,3-didehydropodophyllotoxins were synthesized by a straightforward multi-component reaction in the hope of finding new structures with interesting anticancer activity. The “one-pot” synthesis process is developed to increase performance as well as minimize the steps involved. The obtained compounds with podophyllotoxin frame have the corresponding yields of 60-83%. Five new 4-aza-2,3-didehydropodophyllotoxins demonstrated comparable cytotoxicity against the Hep-G2, MCF7cell lines with an IC50 value of 52.2 - 261.2 µM with ellipsitine as the positive control.
Neolignans and flavonol glycosides from the leaves of viburnum lutescens blume
Authors: Duc Thien Le , Thi Dung Duong , Phuong Minh Nguyen , Hai Dang Nguyen
Published: June 2022

Four neolignans, (7S,8S)-dihydrodehydrodiconiferyl alcohol 9-O-β-D-glucopyranoside (1), (7S,8S)-dihydrodehydrodiconiferyl alcohol 9′-O-β-D-glucopyranoside (2), (7S,8R)-5-methoxydihydrodehydrodiconiferyl alcohol 4-O-β-D-glucopyranoside (3), and (7S,8R)-5-methoxydihydrodehydrodiconiferyl alcohol 9′-O-β-D-glucopyranoside (4)  and five flavonol glycosides, kaempferol-3-O-β-D-glucopyranoside (5), kaempferol 3-O-rutinoside (6), kaempferol 3-O-α-L-rhamnopyranosyl (1→6)-β-D-galactopyranoside (7), kaempferol 3-O-β-D-galactopyranoside (8), and quercetin 3-O-β-D-glucopyranoside (9) were isolated from the methanol extract of Viburnum lutescens Blume leaves. Their chemical structures were elucidated by 1D- and 2D-NMR spectra and comparison with those reported in the literature. Compounds 1, 2, and 4 were reported from Viburnum genus for the first time.
Optimally stable matchings for resource allocations
Authors: Trang Le Hong , Viet Hoang Huu
Published: June 2022

The stable marriage problem (SMP) and its variants have received much attention in the literature due to their wide range of applications. One of their applications is resource allocation in network environments. In this paper, we consider two resource allocation problems. The first one is to maximize the performance of a system in the fog computing environment while maintaining a low cost. In the problem, the resource allocation task will be rewritten as the MAX-SMTI variant (i.e., finding the maximum cardinality stable matching of the stable marriage with ties and incomplete lists). It is then formulated under an integer linear program to solve. The best allocation can then be chosen to be the lowest cost one among stable matchings. In the same manner, another variant called MAX-HRT (i.e., finding the maximum cardinality stable matching of the hospital-residents with ties) is applied for the second application regarding the virtual machine allocation. By using MAX-SMTI and MAX-HRT models which are solved via integer linear programs, we aim to not only find stable matchings for the resource allocation problems but also maximum length matchings. Consequently, a maximum number of user requests should be served at a time. The models are implemented in C++ using the SCIP solver. Numerical experiments are conducted for large datasets and results are given to show the efficiency of the models.
Effect of tri(methoxysilyl)propyl methacrylate silane modified nanosilica on some properties of acrylic coating
Authors: Chinh Nguyen Thuy , Hung Dao Phi , Hiep Nguyen Anh , Thai Nguyen Xuan , Hoang Thai
Published: June 2022

Acrylic emulsion resin is one of popular matrixes for both outside and inside coatings. It has low cost, high UV and weather resistance, good aesthetics and environmentally friendly. The introduction of inorganic additives in nanosize such as SiO2, TiO2, etc. into acrylic emulsion resin could improve the mechanical and thermal properties of the polymer matrix. The surface modification of nanoparticles can enhance the dispersibility of the nanoparticles in the polymer matrix. This paper presents the characteristics of nanosilica modified with different contents of tri(methoxysilyl)propyl methacrylate silane (MPTS) as a coupling agent and the effect of modified nanosilica on the abrasion resistance and thermal properties of acrylic emulsion resin. The infrared (IR) spectroscopy and thermo-gravimetric analysis (TGA) were used to evaluate the presence of MPTS on the surface of modified nanosilica. Grafting yield of MPTS on the surface of nanosilica was calculated from TGA diagrams. The obtained results showed that nanosilica was surface modified successfully by MPTS with a grafting yield of 47 % when using 3 wt.% of MPTS. After modification, the modified nanosilica became more hydrophobic and can disperse well in acrylic emulsion resin. The modified nanosilica improved significantly the abrasion resistance of acrylic coating as compared to neat acrylic resin and acrylic/unmodified silica nanocoating. The MPTS modified nanosilica has the potential to be applied as a reinforcing additive to acrylic emulsion resins to improve its abrasion resistance.
Synthesis of chitosan-graft-polyaniline with the conductive potential
Authors: Chau Ngoc Mai , La Thi Thai Ha , Sam Minh Tuan
Published: June 2022

Chitosan (CS) is one of the most plenteous polymers in nature and gets ubiquitous in many  fields  such  as  pharmaceutical  and  medical  industries,  wastewater  treatment,  agriculture, etc.due  to  its  remarkable biodegradability  and  friendliness  to  human  beings  and  ecology. Recently,  nature-originated  conductive  materials  havebeen  gaining  more  attention  than  other materials because  they  can  be  utilized  in  reality,  while  others are  difficultto  decompose  after use.  Understandably,  polyaniline  (PANI),  which  is  one  of  the  prominent  conductive  polymers with  a  distinguished  conjugated  structure,  simple  synthesis,  cost-effectiveness,  environmental stability,  and  conductivity,  was  grafted  with  CS  (CS-graft-PANI)  to  produce  a  copolymer possessing a combination of properties between CS and PANI. Althoughthere have been several researchesrelated  to  this  copolymer,  the  grafting  efficiency  and  electrical  conductivity  wererelatively  low.  Therefore,  this  paper  aims  at  obtainingahigher  efficiency  and  electrical conductivity of CS-graft-PANI copolymerby systematically adjusting the synthesis parameters including  the  volume  of  acid  solution  to  dissolve  aniline,  initiator  concentration,  acetic  acid concentration to dissolve CS, the initiator methods and dopants. As a result, the best copolymer product reached a graft efficiency of 69.4% and grafting percentage of 78.5% with an electrical conductivity  of 7.9610-3 Scm-1.  The  chemical  composition  and  morphology  were determinedby  Fourier-transform  Infrared  Spectroscopy  and  Scanning  Electron  Microscope  while  the thermal characteristic was also carefully detected via Thermogravimetric Analysis.
Phase-separated porous PVDF-CO-HFP thin film for High-power triboelectric nanogenerator
Authors: Chau Ngoc Mai , Le Thu Ha , Huynh Dai Phu , Truong Thi Hien , La Thi Thai Ha , Bui Van Tien
Published: June 2022

Triboelectric nanogenerator (TENG), one of the latest and most effective technologies to harvest green energy in the industrialization and modernization era, converts mechanical energy to electricity through triboelectrification and electrostatic induction. Herein, highly porous poly(vinylidene fluoride-co-hexafluoropropylene) (PDVF-co-HFP) as a negatively charged tribomaterial was assembled with microdome-patterned chitosan as a positively charged surface to fabricate TENG and examine its mechanical and electrical properties. The results revealed that the porous PVDF-co-HFP-based TENG could generate a maximum instantaneous power of 3 mW and an open-circuit voltage of 200 V, which is 4 times higher than that made from flat PVDF-co-HFP and could light up 102 LEDs. The newly developed PVDF-co-HFP-based TENG achieves a great convergence between excellent flexibility, scalability, and superior electrical output, which has great application potential in wearable electronic devices.