bluuebunny/crossref_metadata_2025 huggingface dataset:
Pulsed Laser Deposited Sns-Snse Composite Thin Film As a New Anode Material for Lithium Storage
Authors: Cui Yixiu , Liu Xiaojiang , Zhao Yu , Wei Kaiyuan , Yang Yin , Cui Yanhua
Published: February 2020

Tin-based materials have been arousing extensive interest for using as anode electrodes in the field of lithium ion batteries (LIBs) due to the fact that Sn could alloy with Li to form Li4.4Sn and deliver extremely high capacity of 994 mAh g-1. However, the significant volume change of Sn particles during charge-discharge cycles hinders the practical use of Sn-based materials. One possible solution to this volume-change issue is to switch bulk material to thin-film material, which could effectively reduce stress caused by the large volume change upon cycling.

In this work, SnS-SnSe composite thin films are synthesized by plused laser deposition method. The initial discharge capacity of SnS-SnSe composite film is 1225.8 mAh g-1. The reaction mechanism of the composite with Li has been investigated. It is revealed that SnS-SnSe composite thin film firstly reacted with Li during discharge to form Li2S、Li2Se and Sn, then Sn reacted with Li to form LixSn alloy. During charge process, LixSn firstly decomposed to form elementary Sn, then Sn catalyzed Li2S and Li2Se to decompose to reform SnS-SnSe composite thin film. Li2S and Li2Se produced during discharge process act as buffer material which might release stress caused by volume change, thus enhancing cycling performance of the component film. Additionally, SnS-SnSe composite thin film possesses more grain boundaries than single SnS or SnSe thin film, which could effectively enhance electrochemical activity and contribute to the capacity increment.

Figure 1
Graphite Oxide Cathode for Greener Rechargeable Aluminum Battery
Authors: Li Zhanyu , Li Jianling , Liu Yanying , Ding Feixiang , Yang Kai , Gao Fei
Published: February 2020

Graphite Oxide Cathode for Greener Rechargeable Aluminum Battery

In recent years, with the gradual depletion of traditional energy, Secondary battery is being widely researched and applied, and will become a vital force in a plenty variety of new green energy. Aluminium is the most abundant metal in the earth’s crust and each aluminum ion carries three electrons which make the capacity of the aluminum ion battery is expected to be greatly improved. Additionally, aluminum ion battery might offer significant cost savings and safety improvements over the Li-ion battery platform due to the price of aluminum is much lower than that of lithium. However, at present, the working voltage and energy density of the aluminum ion battery is lower than that of the lithium ion battery, so it is urgent to develop a new kind of positive electrode material of aluminum ion battery to improve the electrochemical performance. [1-2]

In the work, we report on a novel Al-ion battery system using graphite oxide as the cathode against an aluminium metal anode in an ionic liquid (IL), 1-butyl-3-methylimidazolium trifluoromethanesulfonate ([BMIM]OTF) and aluminum trifluoromethanesulfonate (Al(OTF)3), -based electrolyte. [3] As shown in Figure 1a, the charge and discharge capacity gradually decreased with the increase of cycle number. However, reduction of discharge capacity is much smaller than that of the charge capacity. As shown in Figure 1b, with the increase of cycle number, the discharge capacity is gradually reduced and the coulombic efficiency is gradually increased, which are consistent with the results obtained from the Fig.1a. It can be seen from the Fig.1a that the first discharge capacity of graphite oxide cathode is only 26.7 mAh/g and its electrochemical polarization is relatively large, so we will further improve the oxidation graphite to enhance the electrochemical properties of aluminum ion batteries.

Reference

1. Dunn, B.; Kamath, H.; Tarascon, J.M., (2011) Electrical energy storage for the grid: a battery of choices. Science, 334: 928-935

2. Lin, M.C.; Gong, M.; Lu, B.; Wu, Y. P.; Wang, D.Y.; Guan, M.; Angell, M.; Chen, C.;Yang, J.; Hwang, B.J.; Dai, H., (2015) An Ultrafast Rechargeable Aluminium-Ion Battery. Nature, 520: 524-528.

3. wang, H.L.; Gu, S.C.; Bai, Y.; Chen, S.; Wu, F.; Wu, C.; (2016) A high-voltage and non-corrosive ionic liquid electrolyte used in rechargeable aluminum battery. ACS Appl. Mater. Interfaces, 8: 27444-27448.

Acknowledgments

The experimental research was funded by the National Natural Science Foundation of China (no.51572024, 51372021)

Figure 1
(Invited) Facile Isolation of Adsorbent-Free Long Semiconducting Single-Walled Carbon Nanotubes Based on Supramolecular Chemistry
Authors: Nakashima Naotoshi , Toshimitsu Fumiyuki
Published: February 2020

The separation/purification of semiconducting single-walled carbon nanotubes (sem-SWNTs) with high quality is one of the most important issues in the science and technology of carbon nanotubes[1-5]. We have reported that supramolecular coordination polymer and hydrogen bonding systems to provide selectively sorting of sem-SWNTs not containing the used adsorbents.

In this study, we describe a simple, less expensive, scalable and highly efficient sem-SWNT sorting using removable solubilizers. The used molecules are Vitamin B2 and flavin/isoaloxazine derivatives. Together with experimental results and molecular mechanics and molecular dynamics simulations, we have revealed molecular requirements for the solubilizers, as well as a possible mechanism for such efficient sorting.

References

[1] F. Toshimitsu, N. Nakashima, Nature Communications, 2014, 5, art no. 5041.

[2] F. Toshimitsu, N. Nakashima, Sci. Rep., 2015, 5, art. no.18066.

[3] F. Toshimitsu, N. Nakashima, Chem. Eur. J., 2015, 21, 3359-3366.

[4] K. Akazaki, F. Toshimitsu, H. Ozawa, T. Fujigaya, N. Nakashima, J. Am. Chem. Soc. 2012, 134, 12700-12707.

[5] H. Ozawa, X. Yi, T. Fujigaya, Y. Niidome, T. Asano and N. Nakashima, J. Am. Chem. Soc., 2011, 133, 14771–14777.
Redox Flow Batteries Based on Aqueous Soluble Organics
Authors: Wei Xiaoliang , Hollas Aaron , Yang Zheng , Huang Jinhua , Duan Wentao , Li Bin , Nie Zimin , Walter Eric , Vijayakumar Murugesan , Reed David , Zhang Zhengcheng , Wang Wei , Sprenkle Vincent
Published: February 2020

Redox flow batteries have special advantages for grid energy storage applications because of the unique cell architecture that can decouple the stored energy and power. This has offered excellent scalability and design flexibility to meet different grid requirements. Traditional inorganics-based flow batteries such as all-vanadium are at near-commercialization stage. However, the high chemical cost has led to considerable capital cost that great limits their broad market penetration. On the other hand, some redox-active aqueous soluble organic (ASO) materials can offer significant cost and performance merits and enable competitive flow battery systems.1,2Facile molecular diversity and structural tailorability also gain benefits in achieving high solubilities and cell voltages for flow batteries.

Here we report our materials developmental accomplishments in pursuing high-performance ASO flow batteries.3A variety of promising ASO candidates have been identified with desirable redox potentials and kinetics. Our strategies to improve the solubilities, chemical stabilities, and system performance of these ASO materials will be discussed. We also have gained fundamental understandings of the key performance-limiting factors in determining chemical stability of these redox species and capacity degradation of flow systems. These insights can effectively guide future ASO materials development and improvement.

References

1. Winsberg, J.; Hagemann, T.; Janoschka, T.; Hager, M. D.; Schubert, U. S. Angew. Chem. Int. Ed.
2017,
56, 686 –711.

2. Park, M.; Ryu, J.; Wang, W.; Cho, J. Nat. Rev. Mater.
2016,
2, 16080.

3. Liu, T.; Wei, X.; Nie, Z.; Sprenkle, V.; Wang, W. Adv. Energy Mater.
2016, 6, 1501449.

Figure 1. The stable cycling efficiencies and capacities of an ASO flow battery.

Figure 1
Sub-2 Nm Thick Alkylsilane Self-Assembled Monolayer-Coated High Voltage Spinel Crystals As Promising Cathode Materials for Lithium Ion Batteries
Authors: Kim Dae-wook , Zettsu Nobuyuki , Teshima Katsuya
Published: February 2020

We demonstrate herein that an ultra-thin alkylsilane self-assembled monolayer (SAM) coating can be used as a modifying agent at LiNi0.5Mn1.5O4-

d

cathode/electrolyte interfaces in 5 V-class lithium-ion batteries. Bare LiNi0.5Mn1.5O4-

d

 cathode showed substantial capacity fading, with capacity dropping to 79% of the original capacity after 100 cycles at a rate of 1 C, which was entirely due to dissolution of Mn3+ from the spinel lattice via oxidative decomposition of the organic electrolyte. Capacity retention was improved to 97% on coating ultra-thin SAM onto the LiNi0.5Mn1.5O4 cathode surface. Various characterizations revealed that such surface protection with highly ordered alkyl chains insulated the cathode from direct contact with the organic electrolyte, shift their valence band position, led to increased tolerance to HF.
Corrosion Studies of Titanium Stabilized Stainless Steel Using Scanning Electrochemical Microscopy for Hydropower Applications
Authors: Mauzeroll Janine , Gateman Samantha , Lacasse Robert
Published: February 2020

Several Canadian hydropower facilities have been in service for more than 100 years exposing vital equipment to both physical and chemical stressors from the environment. Recent advances in erosion mitigating technologies such as thermal spray coating techniques have been responsible for the extended material performance; however, these advances still have chemical vulnerabilities in the form of corrosion. In order to combat corrosion, it has been proposed to fabricate erosion resistant coatings using a corrosion resistant material such as stainless steel. The spatiotemporal tracking of the corrosion process occurring at the stainless steel’s heterogeneous microstructure was performed through tandem analyses involving electron and electrochemical microscopies. By understanding the relationship between the chemical composition of the microstructure and local reactivity over time, insight on failure mechanisms of such industrially important material can be obtained.
Enhanced Corrosion Mitigation of TiO2 Coated Stainless Steels Under UV Illumination
Authors: Sathasivam Kamalasekaran , Yeh Tsung-Kuang , Wang Mei-Ya
Published: February 2020

Austenitic stainless steels are commonly used as the structural material for dry-storage canisters in nuclear power plants because of their excellent corrosion resistance and mechanical properties. Dry-storage canisters are often exposed to chloride containing atmosphere near seashores, which could induce localised stress corrosion cracking in these stainless steels near the welded regions. TiO2coatings applied on stainless steel substrates (i.e. Type 304 stainless steels) along with ultraviolet (UV) irradiation have been proposed as a mitigation measures against the corrosion in canister materials.

In this study, TiO2 coatings were applied on stainless steel samples using a sol-gel dip-coating method. The corrosion characteristics of the coated samples were studied under the conditions of different coating treatments, annealing temperatures, annealing atmospheres and UV illumination durations. The corrosion mitigation performance of the coated samples with and without UV illumination was evaluated by electrochemical polarization analyses and open-circuit potential measurements. The surface morphologies of the samples were studied by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and laser Raman spectroscopy. In addition, the photocatalytic responses of these coatings exposed to various acidic and alkaline aqueous solutions under aerated and deaerated conditions were also studied. The results indicated that the TiO2coating not only could lead to low electrochemical potentials of the stainless steel samples during UV illumination, but could also maintain the low electrochemical potentials even after the cut off of UV illumination. Results from Electrochemical polarization analyses further support the superior corrosion resistance under UV-illumination conditions.

Keywords: Stainless steel, TiO2 coating, ultraviolet illumination.
Passive Target Localization Problem Based on Improved Hybrid Adaptive Differential Evolution and Nelder-Mead Algorithm
Authors: Rosić Maja B. , Simić Mirjana I. , Pejović Predrag V.
Published: February 2020

This paper considers a passive target localization problem in Wireless Sensor Networks (WSNs) using the noisy time of arrival (TOA) measurements, obtained from multiple receivers and a single transmitter. The objective function is formulated as a maximum likelihood (ML) estimation problem under the Gaussian noise assumption. Consequently, the objective function of the ML estimator is a highly nonlinear and nonconvex function, where conventional optimization methods are not suitable for this type of problem. Hence, an improved algorithm based on the hybridization of an adaptive differential evolution (ADE) and Nelder-Mead (NM) algorithms, named HADENM, is proposed to find the estimated position of a passive target. In this paper, the control parameters of the ADE algorithm are adaptively updated during the evolution process. In addition, an adaptive adjustment parameter is designed to provide a balance between the global exploration and the local exploitation abilities. Furthermore, the exploitation is strengthened using the NM method by improving the accuracy of the best solution obtained from the ADE algorithm. Statistical analysis has been conducted, to evaluate the benefits of the proposed modifications on the optimization performance of the HADENM algorithm. The comparison results between HADENM algorithm and its versions indicate that the modifications proposed in this paper can improve the overall optimization performance. Furthermore, the simulation shows that the proposed HADENM algorithm can attain the Cramer-Rao lower bound (CRLB) and outperforms the constrained weighted least squares (CWLS) and differential evolution (DE) algorithms. The obtained results demonstrate the high accuracy and robustness of the proposed algorithm for solving the passive target localization problem for a wide range of measurement noise levels.
Acute Esophageal Necrosis (Gurvits Syndrome): A Rare Complication of Diabetic Ketoacidosis in a Critically Ill Patient
Authors: Vien Linda P. , Yeung Ho-Man
Published: February 2020

Acute esophageal necrosis (AEN) is a rare clinical diagnosis that primarily affects the distal third of the esophagus. AEN causes odynophagia, leading to decreased oral intake and food avoidance. AEN can arise in critically ill patients with multiple comorbidities and is an uncommon complication of diabetic ketoacidosis (DKA). We present a case of a young female with poorly controlled, insulin-dependent diabetes mellitus type 2 who developed odynophagia, small volume coffee-ground emesis, and inability to tolerate oral intake after resolution of DKA. She was found to have esophagitis with esophageal necrosis in the middle third of the esophagus on upper gastrointestinal endoscopy. She was subsequently treated with fluid resuscitation and gastric acid suppression and improved clinically with slow advancements in her diet. The location of her lesion in the more vascularized middle one-third of the esophagus and lack of significant blood pressure variations during her hospital stay make her case unique. Thus, AEN should be considered in the differential diagnosis for critically ill patients who present with vague symptoms such as odynophagia and gastrointestinal bleeding.
Three new species of Epipompilus Kohl (Hymenoptera, Pompilidae, Pepsinae) from Australia
Authors: YUAN DAVID , RODRIGUEZ JUANITA
Published: February 2020

Three new species are added to the genus Epipompilus (Hymenoptera: Pompilidae) in Australia. Epipompilus mirabundus sp. nov., E. taree sp. nov., and E. namadgi sp. nov. are described and illustrated. A key to males of Epipompilus is provided. A novel association of Epipompilus and Sceliphron formosum (Hymenoptera: Sphecidae) is also documented. The larva of E. mirabundus sp. nov. was found sharing single nest cell with a Sceliphron larva; this association could be the result of a parasitised spider being brought back to the nest by the Sceliphron adult.
A new species and new record of the intertidal rove beetle genus Bryothinusa Casey (Staphylinidae: Aleocharinae: Myllaenini) from Japan
Authors: LIU TIANTIAN , ONO HIROKI. , MARUYAMA MUNETOSHI
Published: February 2020

A new species of the intertidal rove beetle genus Bryothinusa, B. japonica sp. nov. is described, and B. koreana Ahn & Jeon, 2004 is recorded from Japan for the first time. These species are illustrated and compared with similar species. A key to the Japanese Bryothinusa species and a checklist of the known Bryothinusa species are provided.
Religion and psychiatry: clinical applications
Authors: Koenig Harold G. , Peteet John R. , VanderWeele Tyler J.
Published: February 2020

In an earlier article we reviewed the latest research on the relationship between religious involvement and mental health, the effects of religiosity on mental health and well-being over time and the impact of religious interventions. Here we focus on clinical applications that may be useful to psychiatrists and other mental health professionals. We discuss general clinical applications relevant to all patients (e.g. taking a spiritual history, supporting/encouraging religious beliefs, referring to clergy), violations of clinician–patient boundaries and the need to ensure that religious/spiritual interventions are patient-centred. We describe evidence-based religious interventions and how to identify appropriate patients for this approach. Finally, we explore situations in which religious beliefs and practices may be a problem, not a resource, and make recommendations on how to address such cases. Case vignettes illustrate clinical situations that mental health professionals are likely to encounter. Although the focus is on the North American context, we note how practice and culture in the UK may differ.
Hot liver on 18F-FDG PET/CT imaging—a quandary for oncoradiologists in South Asia
Authors: B Vijayakumary , C Ramachandran , V M Bharath , Muralee Madhu , Raj Jubie
Published: February 2020

A 56-year-old female presented with intermittent hemoptysis and was diagnosed with lung cancer. 18F-fluorodeoxyglucose positron emission tomography/CT for staging revealed hypermetabolic liver (hot liver), uptake in the mediastinal lymph nodes and reduced uptake in the kidneys. Unexpectedly, liver biopsy findings were consistent with tuberculous infection. Following the intensive phase of antituberculous treatment, repeat CT revealed significant resolution of the mediastinal lymph nodes making the lung cancer Stage 1 (T1 lesion). She underwent left lower lobectomy as a definitive surgical treatment. Positron emissiontomography/CT scan in this patient was considered to be a hepatic superscan since it revealed a hot liver.
Congruence between nurses' and patients' assessment of postoperative pain: a literature review
Authors: Wooldridge Sarah , Branney Jonathan
Published: February 2020

Postoperative pain remains poorly managed for many patients. Effective pain management begins with accurate pain assessment, with patient self-reporting considered the most accurate measure of pain. This literature review aimed to identify how congruent nurses' assessments of pain were with patients' self-reporting. A search identified six observational studies and one quasi-experimental study that met the inclusion criteria. The findings from these studies were summarised under two themes: nurses' underestimation of patients' pain and nurses' knowledge and understanding of pain assessment. Some nurses' pain management knowledge was deemed inadequate, with evidence of negative attitudes towards managing pain in certain groups of patients. Educational interventions have so far had limited impact on correcting the ethical and professional problem of inadequate pain relief in many patients postoperatively. Randomised controlled trials are required to identify effective education interventions that can contribute to ending this avoidable suffering.
What Do Transition Assessments Look Like for Students With a Significant Cognitive Disability? A Multistate Survey of Educational Stakeholders
Authors: Deardorff Malarie E. , Pulos Joshua M. , Suk Andrea L. , Williams-Diehm Kendra L. , McConnell Amber E.
Published: February 2020

Despite challenges educators face when assessing needs of students with significant cognitive disabilities, providing a fair and accurate assessment of skills is crucial to a student's future success. Dismal outcomes for these students indicate the current transition planning process is weak and not appropriate. Research suggests meaningful transition planning is facilitated by appropriate transition assessment to ensure students with significant cognitive disabilities make progress, meet annual transition goals, have individualized supports and services, and receive effective instruction. The purpose of this study was to investigate the nationwide transition assessment process for students with significant cognitive disabilities. Results indicated transition assessments are not fully assessing the needs of this population, thereby denying equal participation and access to inclusive environments.
Top Tier, Not Top Dollar: University of Texas at Austin’s MFA in Film and Media Production
Authors: McGregor Brynne
Published: February 2020

You’ve done it (almost). In the home stretch of your undergraduate film degree you find yourself looking back on the years of critiques, citations, and corrupted video files you scrambled to fix. You’re not sure which is scarier: diving headfirst into online job search sites or enrolling in another few years of deadlines, desks, and debt. Leaning toward the latter option? You may face the reality that the graduate school selection and application process are some of those things they didn’t teach you in film school.
Books
Authors: Pearce Jonathan T. , Michael-Victor Penrose Jordan , Rudolph Kelly , Davis Brian C. , Roche Jenicka
Published: February 2020

The Webcam as an Emerging Cinematic Medium, Paula Albuquerque (2018)

Amsterdam: Amsterdam University Press, 244pp., ISBN: 9789462985582 (hbk), $120.00, ISBN 9789048536733 (ebk)

The Flaherty: Decades in the Cause of Independent Cinema, Patricia R. Zimmermann and Scott MacDonald (2017)

Indiana University Press, 360pp., ISBN: 9780253026248 (hbk), $25.00

Governing Visions of the Real, Lars Weckbecker (2016)

Intellect, 200pp., ISBN: 9781783204953 (hbk), $86.00

Los Angeles Documentary and the Production of Public History, 1958-1977, Joshua Glick (2018)

University of California Press, 277pp., ISBN: 9780520293717 (pbk), $34.95

Traumatic Imprints: Cinema, Military Psychiatry, and the Aftermath of War, Noah Tsika (2018)

University of California Press, 300pp., ISBN: 9780520297647 (pbk), $34.95
XXY (2007), la gran decisión de ser intersexual
Authors: Carmona Corcuera Mariajose Milagros
Published: February 2020

En este artículo se centrará en el análisis de la película argentina XXY (2007), de Lucía Puenzo. Es de mi particular interés saber el impacto social y familiar que ocasionaría el velar por un niño “intersex” ya que presenta uno de los mayores desafíos a las estructuras sociales binarias, tal como lo vemos en la película, cuando su condición se vuelve pública.El objetivo principal de este análisis, es mostrar el estigma las repercusiones psicológicas que el paciente debe atravesar al ser “obligado” a elegir un solo sexo.
25 años después del estreno de Philadelphia (1993), ¿Qué cosas han cambiado en la infección por VIH?
Authors: Pintor Holguín Emilio , Herreros Ruiz-Valdepeñas Benjamín , Gargantilla Madera Pedro , Gutiérrez Cisneros María Josefa
Published: February 2020

En el presente año 2019 se han cumplido 25 años del estreno de la película Philadelhia de Jonathan Demme, que en nuestro país se produjo en marzo de 1994. Pretendemos con este artículo hacer una reflexión de los cambios que se han producido en la infección HIV tanto en el diagnóstico, tratamiento y pronostico así como en el ámbito social: cuando se presenta la película hacía unos 10 años de los primeros casos, se contemplaba la infección por HIV como una enfermedad con un amplio rechazo social con estigmatización de varios grupos de riesgo (homosexuales, adictos por vía intravenosa y hemofílicos) y las vías de contagio, el diagnóstico solía hacerse en fases tardías de la enfermedad con cuadros de inmunodeficiencia severa como sarcoma de Kaposi, neumonía por Pneumocystis carinii, toxoplasmosis cerebral y meningitis por criptococo y los tratamientos eran poco efectivos. En la actualidad, el diagnóstico y tratamiento es mucho más precoz y efectivo y la estigmatización social ha desaparecido.
Information Literacy a Scientometric Assessment of Global Research Output
Authors: Bapte Vishal Dattatray
Published: February 2020

The paper attempts to measure the global research output on information literacy (IL) on the basis of data retrieved from SCOPUS database during 1975 to 2019. The total output included 7070 record and 50584 citation. The average citation per paper was 7.15 per cent. Among the most significant sources titles used for the publication of IL research, Communication in Computer and Information Science was found to be leading journal with 380 papers. However, Journal of Academic Librarianship has been recorded for receiving highest citations (6.75 %) and highest (32) h-index. Pinto, M from Universidad de Granada has been observed as the most prolific author with 48 publication. Lloyed, A got maximum 1062 citation and the highest (17) h-index was calculated for him. Out of total output in the entire subject field, the subjects in the Social Sciences have been resulted for highest quantitative yield with h-index 170. With regard to the distribution by the types of documents, ‘Article’ seemed to be most preferred source over the rest. USA accounted for 46.94 per cent research output in total publications. Purdue University from United States and Queensland University of Technology ‘OUT’ from Australia have been most prominent institutions in terms of institutional output. 7070 documents produced 22353 keyword in which the phrase ‘information literacy’ dominated the remaining terms.
Ostensibly indirect narration in films and motion pictures.
Authors: Marek Hendrykowski Marek Hendrykowski
Published: February 2020

The article proposes the hypothesis that on the basis of analytical and interpretative practices, when describing, analysing and interpretating moving images, a dichotomous, binary division into objective and subjective images is a highly questionable move: it does not lend itself to an absolutely unequivocal resolution. In film, as in the field of moving images as a whole, there is no objective narration, just as there is no subjective narration. What emerges is an ostensibly dependent narration (or ostensibly independent), blending and merging both of these aspirations in diverse ways.
Respuesta termográfica de bloques de concreto para uso no estructural preparados con ceniza industrial
Authors: Serrano Guzmán María Fernanda , Pérez Ruiz Diego Darío , Ballesteros Giraldo Cristian David
Published: February 2020

Ash is a waste product of different commercial activities. For the paper industry, the disposal of this residue, which results from the combustion of the coal used in the production process, represents a problem. For this reason, its use in the production of concrete blocks has been evaluated. The objective of this study is to compare the thermographic response of industrially-manufactured, non-structural concrete blocks that have been prepared with this ash. Additionally, the mechanical behavior of the blocks is compared when the ash is replaced on a percentage basis with cement. Likewise, substitutions of 10, 20, 30 and 40% of ash for cement were made for blocks that were prepared in accordance with quality control requirements of a concrete block plant. Specialized techniques such as X-ray diffraction and microscopy demonstrated the absence of toxic substances in the ash. The study revealed that thermal absorption capacity increases as more ash is used.
El análisis multivariante aplicado al abastecimiento de Gas Licuado de Petróleo (GLP) en el Perú
Authors: Adaniya Higa Beatriz
Published: February 2020

This article provides a brief analysis on energy supply security, focusing mainly on the variables related to the supply of liquefied petroleum gas (LPG) within the Peruvian market. Furthermore, via the use of real data, principal component analysis (PCA), one of the most common multivariate techniques, is explained and illustrated, whose result indicates that a correlation exists between the analyzed variables.
Impacto de los diarios digitales en la votación electoral
Authors: Paz Panduro David Anibal
Published: February 2020

El presente artículo demuestra que las menciones de los candidatos políticos en los diarios digitales tienen una correlación positiva con la votación electoral. El indicador de la variable independiente usado es el Número de noticias donde son mencionados los candidatos políticos en la prensa digital y el indicador de la variable dependiente es el porcentaje de la votación electoral obtenido por los candidatos políticos. El proceso electoral analizado son las elecciones municipales para Lima Metropolitana 2018. Se ha utilizado el buscador Google usando el comando básico (operador de búsqueda) site para buscar en las webs de 19 diarios digitales peruanos las menciones de los candidatos de manera semi manual. Es decir, los datos son material digital proveniente de fuentes secundarias.
Diseño de un modelo de planificación de la mano de obra directa para la gestión de producción de empresas farmacéuticas
Authors: Quispe Canales Gustavo Raúl
Published: February 2020

In the pharmaceutical industry, production planning responds to changes in customer demand and internal company processes. Processes in this industry are not value-additive, although the industry does present opportunities for improvement, such as reducing overtime, which occurs more than 30% of the time; reducing production rescheduling, which reaches 40%; and improving level of customer service for state institutions, who represent 70% of purchase orders. These situations need to be improved within the company; and as a result, a sales and operations model that includes direct labor planning is designed. This model should enable a reduction of overtime and calculation of the amount of direct labor taking into account efficiency level. In practice, this is the expected outcome; it is achieved via the decisions made by the operations executive.
Sistema de Gestión Ambiental en el Distrito de Ventanilla
Authors: Alvarado Moreno José Luis
Published: February 2020

El Centro Poblado de Mi Perú en la actualidad cuenta con una población de 43,000 habitantes y posee una superficie total de 1.89 Km2. Para esta localidad, una solución de gestión ambiental municipal, es presentada, la cual está orientada a objetivos, y trabaja bajo el enfoque del desarrollo sostenible. La gestión ambiental municipal es considerada como una importante herramienta de gestión para el municipio, por ello es necesario comprender que es realmente y que beneficios se logran, así como también, reconocer la importancia de incorporar variables y factores ambientales en la gestión municipal. En esta investigación se priorizaron tres aspectos: 1) los diagnósticos Ambientales, para determinar el nivel de calidad ambiental en el Centro Poblado Mi Perú; 2) el marco conceptual y teórico de la Gestión Ambiental Municipal, que rodea la gestión ambiental municipal, sus diferentes instrumentos, el área de aplicación del estudio; 3) el Sistema de Gestión Ambiental propuesto, del cual se presenta su arquitectura, funcionamiento y características. Finalmente se presentan los resultados, conclusiones y recomendaciones obtenidas producto del estudio realizado.
Presencia de circovirus porcino tipo 2 en hatos porcinos de Baja California, México
Authors: Gómez Gómez Sergio Daniel , Valencia Gilberto Lopez , Monge Navarro Francisco Javier , Herrera Ramírez José Carlomán , Medina Basulto Gerardo Enrique , Tamayo Sosa Alma Rossana , Arauz Cabrera Jonathan Isaac
Published: February 2020

El objetivo de este estudio fue detectar la presencia de circovirus porcino tipo 2 (PCV2) en hatos porcinos de Baja California, México, empleando la técnica de reacción en cadena de la polimerasa (PCR). Se colectaron 97 muestras de sangre de cerdos procedentes de 26 granjas. El ADN se extrajo a partir de la capa leucoplaquetaria y las muestras fueron agrupadas en 19 grupos de cinco muestras y uno de dos muestras para el análisis de PCR. Se utilizaron cebadores específicos para amplificar un fragmento de 264 pares de bases del ORF2 de PCV2 utilizando como control positivo una vacuna comercial. El fragmento viral se detectó en el 15% (3/20) de los grupos analizados. Este es el primer reporte en el que se evidencia la presencia de circovirus porcino tipo 2 en Baja California.
Evaluación del compost de guano de pollo en el rendimiento y calidad nutricional de la alfalfa en la sierra central del Perú
Authors: Castro Bedriñana Jorge Isaac , Chirinos Peinado Doris Maritza , Lara Schwartz Percy Rodrigo
Published: February 2020

Se evaluó el efecto del uso de compost de guano de pollos (CGP) en niveles de (T1) 0, (T2) 10 y (T3) 20 t/ha sobre el rendimiento de forraje verde (FV), materia seca (MS), altura de planta (AP) y proteína total (PT) de la alfalfa en una pradera de Huancayo (Junín, Perú). El abonamiento se hizo al primer día del estudio y al inicio de la semana 6. El primer corte se hizo a los 42 días del primer abonamiento y el segundo corte a los 35 días del segundo abonamiento. Los rendimientos al segundo corte de FV en T1, T2 y T3 fueron de 18.6, 23.5 y 26.8 t/ha (p<0.05), de MS de 2.5, 7.0 y 7.1 t/ha (p<0.05), de PT de 0.8, 1.0 y 1.2 t/ha (p<0.05) y de AP de 60.8, 66.9 y 63.8 cm, respectivamente (p<0.05). Se demuestra que es posible emplear compost de guano de pollos broiler para obtener una mayor producción orgánica de alfalfa.
Hallazgos hematológicos en perros y gatos en Lima, Perú
Authors: Grandía G. Raiden , Fuentes S. Robert , Pérez P. Joel , Hernández A. Jesús , Castillo E. Melanie , Anicama A. Willian , Caballero C. Jacqueline , Rojas C. Lud , Galindo J. Ivon , Díaz M. Leiner , Fimia-Duarte Rigoberto
Published: February 2020

El objetivo del estudio fue realizar una evaluación hematológica a perros y gatos en Lima, Perú. Se colectaron 460 muestras de sangre (410 perros y 50 gatos) entre diciembre de 2017 y mayo de 2018. Los frotis se colorearon con Wright y las láminas de reticulocitos con Azul de cresil brillante. Se realizó estadística descriptiva para variables cuantitativas en las series eritroide, mieloide y linfoide, así como el análisis de frecuencias de variables cualitativas entre especies indicadoras de tipo de anemia y leucemia, capacidad de regeneración medular, cambios morfológicos anormales, salida de rango fisiológico y presencia de microorganismos extra e intracelular. Predominaron la anemia normocítica normocrómica (23.2% perro, 10% gato), anemia megaloblástica (5.1% perro), anemia severa microcítica hipocrómica (4% gato), leucemia mieloide crónica de neutrófilos (7.1% perro, 8% gato), monocitosis con vacuolización citoplasmática en monocitos (4.9% perro), trombocitosis severa con agregados plaquetarios (6% gato), policromatofilia (6.3% perro), los dacriocitos (54.4% perro, 64% gato), acantocitos (11.7% perro, 40% gato), macrocitos (14.6% perro, 6% gato), leucocitos pequeños (10% perro, 6% gato), Cytauxzoon felis (20% gato), Anaplasma spp (0.2% perro) y Mycoplasma spp (2% perro, 20% gato). Solo se evidenciaron diferencias significativas entre sexos en las plaquetas totales (p=0.0087) y los eosinófilos (p=0.0260) siendo mayor en perros machos. Se concluye que la prevalencia de C. felis en los gatos estudiados es relativamente baja y existe un riesgo de zoonosis de Anaplasma spp y Mycoplasma spp en los propietarios de animales afectados en Lima, Perú.
Adición de metil- β-ciclodextrina cargada de colesterol sobre la criopreservación de semen de toros Holstein Friesian
Authors: Viñán Díaz Hugo Paúl , Paucar Espinoza Juan Enrique , Alvarado Malca Enrique
Published: February 2020

Se evaluó el efecto de la adición de metil-β-ciclodextrina cargada con colesterol (CLC) sobre la criopreservación de semen de toros Holstein Friesian a través de la valoración de las características seminales pre y pos-congelación. Se utilizaron cuatro toros de 3-4 años, obteniéndose 28 eyaculados, que fueron divididos en tres alicouotas, donde se agregó el CLC: 0, 1.5 y 2 mg de CLC por cada 120 millones de espermatozoides (T1, T2 y T3, respectivamente) a 37 °C y fueron incubados por 15 minutos. Las muestras fueron refrigeradas a 5 °C durante 18 horas para su estabilización. La congelación del semen se hizo en pajillas de 0.5 ml usando vapores de nitrógeno por 7 minutos y luego sumergidas en nitrógeno líquido. No se encontraron diferencias estadísticas entre tratamientos en todas las características del semen refrigerado. Los resultados pos-descongelación revelaron mejoras significativas en los tratamientos con colesterol, obteniendo una motilidad total del 67.73, 79.59 y 74.73%; integridad de membrana de 46.89, 60.43 y 55.06% y vitalidad de 63.26, 75.84 y 70.53% para T1, T2 y T3, respectivamente (p<0.05) No hubo diferencias significativas entre tratamientos con respecto a las anormalidades morfológicas.
Efectos de cuatro niveles dietéticos de harina de semilla de chocho (Lupinus mutabilis) sobre parámetros productivos, desarrollo intestinal y valores hematológicos en pavos de ocho semanas
Authors: Paredes A. Manuel , De la Flor M. Enilyn , Mantilla G. José
Published: February 2020

El efecto de cuatro niveles dietéticos de la harina de semilla de chocho (Lupinus mutabilis, HCH) sobre el rendimiento en crecimiento, desarrollo del tracto intestinal y valores hematológicos fueron evaluados en pavos machos de la línea BUT de un día de edad. Los pavos fueron distribuidos en cuatro grupos con dietas diferentes durante 56 días: dieta L0 (control) sin HCH, y dietas L30, L60 y L90 con 30, 60 y 90 g/kg de HCH, respectivamente. El aumento de los niveles de inclusión de HCH en la dieta, agregados a expensas de la torta de soya, contribuyeron a un aumento en las concentraciones de fibra en las dietas experimentales. La ingesta diaria de alimento disminuyó en los tratamientos de HCH y la conversión alimenticia y el aumento de peso corporal de las aves se vieron afectados en tratamientos de 60 y 90 g/kg de inclusión de HCH (p<0.05). Los niveles dietéticos elevados de HCH llevaron a un aumento (p<0.01) de la digesta en el íleon y en el ciego, a un aumento en la masa relativa del tejido (p<0.01), así como una disminución en los valores de pH de la digesta (p<0.01). El incremento de HCH en la dieta no alteró los valores hematológicos. Se concluye que HCH puede considerarse como una alternativa segura y eficaz de inclusión dietética en niveles de 30 g/kg en dietas de inicio para pavos jóvenes.
Evaluación de niveles de energía digestible en dos sistemas de alimentación en la respuesta productiva y reproductiva de cuyes (Cavia porcellus)
Authors: Sarria Bardales José Antonio , Vergara Rubín Víctor , Cantaro Segura José Luis , Rojas Pedro Alejandro
Published: February 2020

El objetivo del presente estudio fue evaluar dietas con dos niveles de energía digestible (2.7 y 2.9 Mcal de ED/kg) y dos sistemas de alimentación (con o sin la inclusión de forraje verde) en cuyes hembras reproductoras, evaluando la respuesta en parámetros productivos y reproductivos (ganancia de peso, consumo de alimento, tamaño de camada, porcentaje de fertilidad, partos, abortos, mortalidad y pesos promedios al nacimiento y destete), así como la respuesta económica. Se trabajó con 60 hembras de segundo parto de 1274 g de peso vivo y 12 cuyes machos mejorados, procedentes de la Granja de Cuyes de Cieneguilla de la Universidad Nacional Agraria La Molina, Lima, Perú. El estudio tuvo una duración de 18 semanas entre mayo y octubre de 2010. Se utilizó un diseño estadístico factorial de 2x2 con cuatro tratamientos y tres repeticiones por tratamiento: T1 y T2 con dietas de 2.7 Mcal de ED/kg con y sin inclusión de forraje verde, respectivamente, y el T3 y T4 con dietas de 2.9 Mcal de ED/kg con y sin inclusión de forraje verde, respectivamente. No se encontraron diferencias significativas entre tratamientos en la mayoría de los indicadores; sin embargo, las madres alimentadas bajo sistemas de inclusión de forraje perdieron peso al destete (-47.6 g), mientras que dietas con el nivel de energía 2.9 Mcal de ED/kg produjeron mayor peso al parto (p<0.05). El menor costo por cría destetada se obtuvo bajo el sistema de alimentación con inclusión de forraje (S/. 5.00 vs. S/. 5.60).
Progreso genético mediante pruebas de rendimiento y de progenie en carneros Corriedale en la sierra central del Perú
Authors: Trillo Zárate Fritz Carlos , Barrantes Campos Cecilio , Nuñez Delgado Jimny , Zirena Arana Nathalie
Published: February 2020

El objetivo del estudio fue comparar el progreso genético esperado de índices de selección para ovinos Corriedale en base a pruebas de rendimiento y progenie. El estudio se realizó en la Unidad de Producción “Corpacancha” de la SAIS Pachacútec, Junín, Perú, a una altitud de 4150 msnm. Se utilizó una prueba de rendimiento en función al peso vivo y peso de vellón, y modelo mixto para obtener el mejor predictor lineal insesgado (BLUP), donde los efectos fijos fueron sexo, tipo de parto y una covariable edad al destete. La progenie fue 118 hembras y 73 machos. El peso vivo a la primera esquila fue 65.86±13.25 kg y el peso de vellón limpio 5.99±1.44 kg. La tasa de fertilidad fue 75%, natalidad 109.7%, partos mellizos 4.8% y 1.7 servicios/preñez. La correlación peso vivo con peso de vellón fue 0.47, adecuada para los índices de selección. El progreso genético esperado del índice de selección por rendimiento fue 1920 y 132 g para peso vivo y peso del vellón a la primera esquila (r2=31.36), respectivamente. El índice de selección de la prueba de progenie mostró un progreso genético de 954.03 g (r2=40.54) para peso vivo y de 117.46 g (r2=40.49) para peso de vellón a la primera esquila. El índice de selección en base a pruebas de progenie da un progreso genético más confiable y los efectos fijos de sexo, tipo de parto y la covariable edad al destete ajustaron y sinceraron más el progreso genético de peso vivo.
Caracterización fenotípica y genotípica de Ornithobacterium rhinotracheale procedentes de aves de corral con cuadros clínicos respiratorios en el Perú entre 2015 y 2017
Authors: Cotaquispe Nalvarte Rony Yunior , Rodríguez Bailón Jorge , Koga Yanagui Isabel , Tinoco Romero Robert , De La Flor Montaubán Irene , Manchego Sayán Alberto
Published: February 2020

Ornithobacterium rhinotracheale, al igual que otras bacterias asociadas a cuadros de orden respiratorio, viene siendo sometida a una exigente presión de selección debido al uso de desinfectantes y antibióticos, lo cual ha venido generando cepas multidrogo resistentes, así como un incremento en la variabilidad genética. El objetivo del estudio fue caracterizar 36 aislados de O. rhinotracheale provenientes de aves de corral de cinco regiones del Perú, mediante un perfil de ocho antibióticos (fosfomicina, amoxicilina, ciprofloxacina, enrofloxacina, norfloxacina, sulfatrimetopim, doxiciclina, oxitetraciclina), y genotipificación por técnicas de ERIC-PCR. Los resultados indican la presencia de multidrogo resistencia de 2 a 6 antibióticos en 94.4% (n=34) de las cepas y 6.6% (n=2) cepas fueron resistentes a un antibiótico, siendo la resistencia más común a la fosfomicina (77.8%) seguido del sulfatrimetopim (75.0%). Se encontraron 11 perfiles genéticos diferenciados (A-K), siendo el perfil D más frecuente en los aislados (55.6%). Los resultados sugieren la presencia de cepas de O. rhinotracheale con moderada variabilidad y perfiles de resistencia a los antibiótico fosfomicina y sulfatrimetopim.
Vigilancia sanitaria de peneidos silvestres en los principales canales de marea de Tumbes, Perú
Authors: Pretell-Monzón Krizia , Saavedra-Olivos Katherine , Calderón-Romero Alfredo , Quevedo Alvarado Vanessa , Alemán de Lama Diego , Boada Mata Betsi , Gómez-Sánchez Muriel
Published: February 2020

Los canales de marea en el departamento de Tumbes, Perú, albergan diversas especies de peneidos, como Penaeus stylirostris y P. vannamei, esta última de gran importancia económica para el país. En 2017 se evaluaron 560 ejemplares de langostinos silvestres en dos periodos de muestreo (mayo-junio y septiembre-noviembre), provenientes de siete canales de marea para determinar la prevalencia de las enfermedades de notificación obligatoria: Síndrome de la Mancha Blanca (VSMB), Infección Hipodérmica y Hematopoyética Infecciosa (VNHHI), Necrosis Hepatopancreática (HPN), Síndrome del Taura (ST), Mionecrosis Infecciosa (VMNI) y Síndrome de la Cabeza Amarilla (VCA1) mediante la técnica del PCR. Se detectó la presencia de tres de los siete patógenos. La mayor prevalencia del estudio fue de VNHHI (6.35%) distribuida en los siete canales de marea, seguido por HPN (2.65%) en cinco canales de marea y VSMB (0.55%) presente en tres canales, pero únicamente en el primer periodo de muestreo.
Depopulation in the Baltic States
Authors: Berzins Atis , Zvidrins Peteris
Published: February 2020

The paper deals with the characterization of the main demographic processes in the Baltics. After the reestablishmentof statehood in Estonia, Latvia and Lithuania, the population dynamics clearly have been decreasing. This isevidenced both by the negative results of natural movement and the dominance of emigration in international migration processes.Population decline (depopulation) is a characteristic feature also for the titular ethnicities. Under-replacement fertility,relatively high mortality, especially for men, a high intensity of emigration and an ageing population are observed in all threeBaltic countries, particularly after accession to the European Union in 2004. Latvia and Lithuania since 1990 have had amongthe highest population loss indicators in Europe. The scenarios of depopulation still prevail in the coming decades.
Sample preparation and imaging for large scale 3D spectral confocal imaging of tissues v1
Authors: Ashkar Tarek , Ferkowicz Michael
Published: February 2020

Frozen participant samples are first sized and preserved for high-resolution 3D imaging. Preserved biopsy sections are imaged, without staining, to understand the sample’s structure and condition.Next, the biopsy sections are stained with antibodies and fluorescent dyes to identify specific structures and cells with pathological significance.This stained sample is imaged in its entirety giving a 3D image.Finally, the 3D image is analyzed by experts to assess known and novel pathologies. This protocol summarizes both label-free imaging and labeling for fluorescence imaging including the labeling, mounting and imaging approaches.The fluorescent labels used herein include conjugated or fluorescent small molecules and conjugated antibodies.Protocol 2 uses both directly conjugated primary antibodies for identifying specific antigens and indirect labeling with a fluorophore conjugated secondary antibody that recognizes the primary antibody. Multiple rounds of imaging are enabled by the use of a non-hardening mounting media, low charge slides and removable rubber cement as a sealant.Details are described below. Two imaging approaches are outlined: protocol 1 and 2.Protocol 1 involves label free imaging of auto-fluorescent species and second harmonic generation (SHG) with multiphoton excitation.These modalities are followed by protocol 2, which involves staining with fluorescent small molecules and immuno-fluorescence and subsequent large scale 3D confocal fluorescence imaging.There are three different staining strategies used in protocols, summarized in Table 1. These protocols start with fixed 50 µm tissue sections prepared as described in the Cryopreservation protocol.