bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of Colchicine treatment on the cariology and morphology signs of Polemonium caeruleum L.
Authors: Glazunova Alina , Hazieva Firdaus , Samatadze Tatiana
Published: February 2020

The effect of colchicine treatment of P. caeruleum on morphological and economically valuable traits, pollen size and fertility, and karyotype of also was studied. Colchicine treatment increased in the size of pollen by 13 % compared to the control, pollen fertility decreased by 19 %. Stained chromosomes of the karyotype were identified, their sizes were determined for the first time, and karyotype formulas for diploid K = (5m + 2sm + 2st) and tetraploid forms K = 2 (10m + 4sm + 4st) were compiled. As a result of colchicine treatment, the plant height decreased by 35 %, the stem thickness by 47 %, the number of generative shoots 18 %, the leaf length 23 % and width increased 22 %, compared to the control. The productivity of raw by 32 % and seeds of tetraploid plants exceeds diploid plants by 22 %.This research was supported government as signment (No. 0576-2019-0008).
Increase in meat productivity of young cattle and horses when using environmentally friendly feed additives
Authors: Volostnova Anna , Yakimov Alexey , Yakimov Oleg
Published: February 2020

The article presents the outcomes of studies confirming the feasibility of using zeolite-containing additives with the objective to optimize the diet of young cattle and horses by the content of minerals in it in order to increase their meat productivity. The research has been conducted in the Republic of Tatarstan. Laboratory studies have confirmed that in terms of hazard the zeolite-containing feed additive belongs to the fourth class of chemicals, specifically, low-toxic compounds in accordance with the requirements of State Standard 12.1.007.76. Scientific and economic experiments have established that the use of a zeolite-containing additive in the diets of young cattle and horses during a store period contributed to an increase in their average daily growth by 10.8 and 12.0 % and slaughter weight by 7.4 and 6.3 % (p<0.05). The slaughter yield in animals of the experimental groups was 54.0 and 58.9 %. The profitability of beef and horse meat production was 17.4 and 19.3 % respectively.
Calibration of soil humidity sensors of automatic irrigation controller
Authors: Abdelfattah Akhmet H. , Sabirov Rais F. , Ivanov Boris L. , Lushnov Maxim A. , Sabirov Raushan A.
Published: February 2020

The article discusses the issues of increasing the efficiency of irrigation of crops cultivated in agriculture. Precise irrigation is an effective solution to irrigation problems. The methods and means of intellectual irrigation, based on sensors that monitor soil moisture and provide signals to the irrigation control solenoid valve, are described. A block diagram of an automatic drip irrigation system is described. For the experiment, five different types of droppers (A, B, C, D, and E) were used Rivulis Eurodrip brand, three of which are droppers with pressure compensation and two are the droppers without pressure compensation. Three parameters were used to study the characteristics of droppers: flow uniformity; volumetric water flow depending on the inlet pressure; determination of the dropper constant and the volume flow exponent. Droppers were tested at three pressures in the system: 0.05, 0.2 and 0.35 MPa. At each pressure value, the experiment was performed in triplicate. The process of calibrating humidity sensors is described. An analysis is made of the effect of soil moisture on the electrical resistance of the sensor for various types of soils. It is recommended that moisture sensors be calibrated to local soil and water conditions.
Feed synbiotic additive to improve the productivity and quality of rabbit meat
Authors: Kurchaeva Elena , Vostroilov Aleksander , Vysotskaya Elena , Maksimov Igor
Published: February 2020

The study is dedicated to research into efficiency of influence of probiotic additive “Prostor” on productivity, chemical composition of meat of rabbits. The influence of synbiotic preparation “Prostor” on the population of male rabbits of hybrid form “Hypharm” of French breeding, selected at the age of 45 days. The study took place at the industrial complex of LLC “Lipetsk rabbit” in Khlevensky district of Lipetsk region. The animals were divided into control and experimental groups by the method of pairs-analogues. The control group of rabbits received the basic diet consisting of lall-mash feed PZK-92, while the rabbits of the experimental group received compound feed PZK-92-60-18, which included synbiotic “Prostor” in a dosage of 1 g/kg of feed. Meat quality assessment was carried out at the age of 105 days after control slaughter in the amount of 3 animals from each group. The use of the stated dosage of synbiotic preparation had a positive effect on the productive indicators of rabbits (live weight, average daily growth). The morphological composition data showed that rabbits of the experimental group outperformed rabbits of the control group by 23.84 % in terms of muscle mass. Analysis of the chemical composition of muscle tissue showed that the use of feed additives “ProStor” in a dosage of 1.0 g per kg of feed has a positive effect on meat productivity and quality of rabbit meat, which opens up prospects for the use of the preparation in the rabbit industry.
Total edge–vertex domination
Authors: Sahin Abdulgani , Sahin Bünyamin
Published: February 2020

An edge e ev-dominates a vertex v which is a vertex of e, as well as every vertex adjacent to v. A subset D ⊆ E is an edge-vertex dominating set (in simply, ev-dominating set) of G, if every vertex of a graph G is ev-dominated by at least one edge of D. The minimum cardinality of an ev-dominating set is named with ev-domination number and denoted by γev(G). A subset D ⊆ E is a total edge-vertex dominating set (in simply, total ev-dominating set) of G, if D is an ev-dominating set and every edge of D shares an endpoint with other edge of D. The total ev-domination number of a graph G is denoted with γevt(G) and it is equal to the minimum cardinality of a total ev-dominating set. In this paper, we initiate to study total edge-vertex domination. We first show that calculating the number γevt(G) for bipartite graphs is NP-hard. We also show the upper bound γevt(T) ≤ (n − l + 2s − 1)∕2 for the total ev-domination number of a tree T, where T has order n, l leaves and s support vertices and we characterize the trees achieving this upper bound. Finally, we obtain total ev-domination number of paths and cycles.
Extension of the forming limits of extrusion processes in sheet-bulk metal forming for production of minute functional elements
Authors: Pilz Florian , Henneberg Johannes , Merklein Marion
Published: February 2020

Increasing demands in modern production pose new challenges to established forming processes. One approach to meet these challenges is the combined use of established process classes such as sheet and bulk forming. This innovative process class, also called sheet-bulk metal forming (SBMF), facilitates the forming of minute functional elements such as lock toothing and gear toothing on sheet-metal bodies. High tool loads and a complex material flow that is hard to control are characteristic of SBMF. Due to these challenging process conditions, the forming of functional elements is often insufficient and necessitates rework. This negatively affects economic efficiency. In order to make use of SBMF in industrial contexts, it is necessary to develop measures for improving the forming of functional elements and thereby push existing forming boundaries. This paper describes the design and numerical replication of both a forward and a lateral extrusion process so as to create involute gearing in combination with carrier teeth. In a combined numerical-experimental approach, measures for extending the die filling in sheet-metal extrusion processes are identified and investigated. Here, the focus is on approaches such as process parameters, component design and locally adjusted tribological conditions; so-called ‘tailored surfaces’. Based on the findings, fundamental mechanisms of action are identified, and measures are assessed with regard to their potential for application. The examined approaches show their potential for improving the forming of functional elements and, consequently, the improvement of geometrical accuracies in functional areas of the workpieces.
Edge and corner effects in selective laser melting of IN 625 alloy
Authors: Matache Gheorghe , Vladut Mihai , Paraschiv Alexandru , Condruz Raluca Mihaela
Published: February 2020

Experimental investigations on top surface of prismatic specimens, manufactured by Selective Laser Melting of IN 625 alloy, were carried out in order to assess the influence of laser power and scanning speed on edge and corner effects. Since the melt-pool behaviour is strongly influenced by the process parameters, all specimens were manufactured with no contour using the same layer thickness, hatch distance and scanning strategy at different levels of laser powers and scanning speeds. 3D laser surface scanning was performed in order to measure surface changes. The experimental results have revealed that melt-pool behaviour during solidification generates elevated ridges on both specimen sides and corners that are strongly influenced by the energy input. The edge ridges width increases with increasing the laser power and decrease with increasing the scanning speed, the rising of corners being much more pronounced. On the contrary, at constant laser power and variable scanning speeds the edge and corner ridges decrease.
Hypermenorrhö
Authors: Ell-Beiser Helga , Wortberg Marie , Uphoff Angelika , Ptok Agnes
Published: February 2020

Vier Experten stellen die Behandlung von Hypermenorrhö mithilfe der Phytotherapie, Gemmotherapie und Hildegard-Heilkunde vor.
Gefäße – Aufbau, Funktionen und Pathologie
Authors: Corts Magga
Published: February 2020

Die größeren Gefäße unseres Körpers bestehen aus drei Schichten: Tunica intima, media und adventitia. Das venöse System gehört zum Niedrighochsystem, das arterielle System zum Hochdrucksystem. Pathologisch kann es unter anderem bei Arterien zu Aussackungen – Aneurysmen – und bei Venen zu Krampfadern kommen.
Dicker als Wasser
Authors: Hain Fabian , Hain Ann-Christin
Published: February 2020

Häufig ist die Polyglobulie – eine erhöhte Erythrozytenzahl im Blut – ein Zufallsbefund, der sich durch Kopfschmerzen, Schwindel oder Tinnitus äußern, aber auch beschwerdefrei bleiben kann. Eine gründliche Anamnese und Diagnostik sowie ein Vergleich von arteriellem und venösem Hämatokrit erschließen hierbei Formen und Ursachen der Erkrankung sowie Schein- und Pseudopolyglobulien. Mit Ausnahme der durch Sauerstoffmangel bedingten Polyglobulien lassen sich alle Formen mit einer Aderlasstherapie behandeln oder begleiten, sofern die Ursache nicht schnell genug behoben werden kann.
Blutwurz – rot wie Blut
Authors: Stern Cornelia
Published: February 2020

Blutwurz (Potentilla erecta) ist seit jeher vor allem bei verschiedenen Verdauungsbeschwerden eingesetzt.
Tradução, adaptação cultural e confiabilidade da versão em português brasileiro do questionário DRAM para avaliação psicométrica em dor lombar
Authors: Tucci Carlos , Jacob Alberto , de Amorim Thiago Bonato , Araújo Alex Oliveira de , Cristante Alexandre Fogaça
Published: February 2020

Objetivo A partir de estudos sobre a fisiologia da dor e suas relações com estados psicológicos, tornou-se essencial a avaliação psicológica dos indivíduos com quadros dolorosos, para selecionar os perfis mais favoráveis às diferentes formas de tratamento. O questionário Distress Risk Assessment Method (DRAM, na sigla em inglês) foi desenvolvido como instrumento de triagem para portadores de dor na coluna vertebral subclassificando os indivíduos em quatro grupos distintos (normal, sob risco, somático e depressivo), conforme a pontuação dos dois questionários que compõem o DRAM (Questionário Modificado de Percepção Somática [MSPQ, na sigla em inglês] e Zung). O objetivo do presente estudo é traduzir e adaptar o DRAM para o português brasileiro da versão original em inglês, além de analisar a confiabilidade da versão traduzida e adaptada.

Método Segundo a metodologia International Quality of Life Assessment (IQOLA), consagrada em inúmeras publicações, foi desenvolvida uma versão em português brasileiro que foi aplicada a uma amostra de 85 indivíduos dos 3 centros participantes portadores de dor lombar.

Resultados Os resultados comprovaram a confiabilidade e reprodutibilidade da versão traduzida e adaptada do questionário DRAM com índice de Cronbach alfa de 0,815 para o MSPQ e de 0,794 para o Zung, e coeficiente de correlação intraclasse de 0,688 para o MSPQ e de 0,659 para o Zung.

Conclusão Tais dados permitiram concluir que a versão do questionário DRAM traduzida e adaptada culturalmente para o português brasileiro é confiável e está disponível para uso na prática clínica.
Chronic Postoperative Pain: Comprehending It to Intervene
Authors: Oliveira Lorraine Ariel Duarte , Rocha Carolina Alves Araújo , Silva Ledismar José
Published: February 2020

It is estimated that between 266.2 and 359.5 million operations were performed in 2012 worldwide, and this number is on the rise. Chronic postoperative pain (CPOP) is the most important and still neglected postoperative complication, with a multifactorial causality, leading to a major impact on morbidity rates, high costs for the public health system, and direct and negative effects on the quality of life of the patients. The present systematic literature review aimed to elucidate the processes of postoperative pain chronification, biopsychosocial factors, risk factors, management of pain, and types of surgical procedures mainly associated with it. The review was based on the methodological recommendations of Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA). The following databases were consulted: the Medical Literature, Analysis, and Retrieval System Online (MEDLINE), the Latin American and Caribbean Health Sciences Literature (LILACS), the Scientific Electronic Library Online (SciELO), and the Cochrane Central Register of Controlled Trials (CENTRAL). After reading the selected articles, the following surgical specialties were chosen to be addressed: general, orthopedics, breast cancer, gynecology, obstetrics, and thoracic. In conclusion, a deficient management of acute postoperative pain is the main risk factor for the development of CPOP. To prevent CPOP, training programs for healthcare professionals should be implemented to improve their skills and knowledge of the management of pain before, during, and after surgeries. It is also necessary to conduct more in-depth studies on the evaluation and management of this condition.
Final report of the key comparison of Vickers hardness: APMP.M.H-K1.b and APMP.M.H-K1.c
Authors: Hattori Koichiro , Wu Chung-Lin , Tak Nae-Hyung , Yang Ping , Sanponpute Tassanai , Leung Raymond , Ha Pham Thanh , Takagi Satoshi
Published: February 2020

This report describes the results of first APMP key comparison on Vickers hardness, APMP.M.H-K1b and APMP.M.H-K1c involving Seven member institutes, CMS/ITRI (Chinese Taipei), KRISS (Korea, Republic of), NIM (China), NMIJ/AIST (Japan), NIMT (Thailand), SCL (Hong Kong, China) and VMI (Vietnam). The pilot laboratory was NMIJ/AIST. Three institute, KRISS, NIM and NMIJ/AIST, act as linking institutes to the key comparisons CCM.H-K1b and CCM.H-K1c conducted for the Vickers hardness scales HV1 and HV30, respectively.

The comparison was also conducted for HV 10 Vickers hardness scales and it was conducted as the supplemental comparison item.

The comparison item is Vickers hardness for 200 HV 1, 200 HV 10, 200 HV 30, 600 HV 1, 600 HV 10, 600 HV 30, 900 HV 1, 900 HV 10, and 900 HV 30. Through this comparison, the results for 200 HV 1, 600 HV 1 and 900 HV 1 scales are linked to CCM.H-K1b, and the results for 200 HV 30, 600 HV 30 and 900 HV 30 scales are linked to CCM.H-K1c. The reference values were calculated by using weighted mean from the results of the institutes. The Degree of Equivalence (DoE) was indicated by the relative deviation from the reference values. All institute results showed in good agreement to the key comparison reference values of CCM.H-K1b and CCM.H-K1c.

Main text

To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.

The final report has been peer-reviewed and approved for publication by the CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).
A practical quantification of error sources in regional-scale airborne groundwater salinity mapping
Authors: King Jude , Essink Gualbert Oude , Karaoulis Marios , Bierkens Marc F P
Published: February 2020

Hosting over 10% of the world’s population, low elevation (<10 m above mean sea-level) coastal zones are susceptible to saline groundwater intrusion—making fresh groundwater an often scarce and threatened commodity. To inform suitable coastal groundwater management strategies, regional-scale mapping of fresh and saline groundwater occurrence is extremely beneficial. This mapping is usually based on conventional ground-based methods. However, these are not only slow and expensive, but result in localized and disconnected information which is uneconomical and impractical on the larg scales required. Airborne electromagnetic (AEM) surveys have been proven a frugal and rapid way to overcome these shortcomings. Consequently, AEM methods are increasingly being used globally. Little is known about the effects of flightline spacing and additional ground-based data on the quality of mapping results, and in general the accuracy of AEM, other than validation against often sparse ground measurements. Understanding this is therefore invaluable as input to groundwater management strategies, survey planning and decision making. Here, we use a regional scale (900 km2), high-resolution (50 m × 50 m × 0.5 m) 3D synthetic model of electrical conductivity and geological properties, to investigate the effects of data availability on the accuracy of regional-scale groundwater salinity mapping. This was undertaken by simulating commonly used AEM parameters and realistic data acquisition methods. Two key data components are considered: (1) the AEM survey itself, and (2) geological information used to convert the AEM results into groundwater salinity. Spatially, different data-densities of these two components are quantitatively compared to highlight ideal geometrical configurations for given accuracy requirements. Our results indicate that in terms of optimising costs versus benefits, the value of additional lithological information is dependent on how well the initial distribution of electrical conductivity is resolved by the acquisition and inversion process.
Silicone elastomers filled with rare earth oxides
Authors: Iacob Mihail , Airinei Anton , Asandulesa Mihai , Dascalu Mihaela , Tudorachi Nita , Hernandez Leonor , Cazacu Maria
Published: February 2020

Silicones which possess, amongst others, remarkable mechanical properties, thermal stability over a wide range of temperatures and processability, and rare earth oxides (REO), known for their unique optic, magnetic and catalytic properties can be coupled into multifunctional composite materials (S-REOs). In addition, the intrinsic hydrophobicity of REO and polysiloxanes makes them easily compatible without the need for surface treatments of the former. Thus, europium oxide (Eu2O3), gadolinium oxide (Gd2O3) and dysprosium oxide (Dy2O3) in amounts of 20 pph are incorporated as fillers into silicone matrices, followed by processing mixture as thin films and crosslinking at room temperature. The analysis of the obtained films reveals the changes induced by these fillers in the thermal, mechanical, dielectric and optical properties, as well as the hydrophobicity of the silicones. The luminescence properties of S-REO composites were investigated by fluorescence spectra and lifetime - resolved measurements with a multiemission peaks from blue to greenish register. The thermogravimetrical analysis indicates an increasing of thermal stability of the composites that contain REO, compared to pure silicone. As expected, the dielectric permittivity significantly increased due to nature of the fillers, while the dielectric loss values are relatively low for all samples, indicating a minimal conversion of electrical energy in the form of heat within bulk composites. The presence of rare earth oxides into the silicone matrix facilitates the motions of long-range charge carriers through the network resulting in higher values of conductivity of the composite films. The stress-strain measurements revealed the reinforcing effect of the rare earth metal oxides on a silicone matrix, leading to a significant increase of Young modulus. The known hydrophobicity of silicones is further enhanced by the presence of REO.
Optoelectronic properties for the compressively strained Ge1−xSnx films grown on Ge(004)
Authors: Tao Ping , Tang Wenchao , Wang Yan , Shi Jianxin , Cheng Henry H , Wu Xiaoshan
Published: February 2020

Compressively strained Ge1-xSnx films (x = 0.04, 0.08, 0.14) have been grown on Ge(004) substrates by Molecular Beam Epitaxy. The wavelength dependence of the refractive index is deduced as

n

(
x
,
λ
)

=

n

Ge

(
λ
)

+

(
‐
2
+
3.5
λ
)

x
+
5

(
1
‐
λ
)

x

2

in the near-infrared range (NIR) (800–1700 nm) for Ge1-xSnx alloy films. That is similar to Si1-xGex alloy films. The Hall measurement shows that the donor levels decrease due to dislocation at room temperature. Temperature dependence of the electron mobility for Ge1-xSnx films reveals that strain-induced defects lower the carrier mobility from 10 K to 310 K. The maximum carrier mobility reaches 2082 cm2/V·s at T = 122 K for Ge0.96Sn0.04/Ge film. These results indicate that Sn-doping has great influences on electronic properties for Ge1-xSnx alloys. Our investigations may be helpful for fabricating the high performance optoelectronic devices.
Superior strength-ductility combination of a Co-rich CoCrNiAlTi high-entropy alloy at room and cryogenic temperatures
Authors: Du X H , Huo X F , Chang H T , Li W P , Duan G S , Huang J C , Wu B L , Zou N F , Zhang L
Published: February 2020

In the present study, a Co-rich CoCrNi-AlTi high-entropy alloy was designed and fabricated by hot forging and 700 °C for 8 h annealing process. The microstructure of the resultant alloy was composed of three multicomponent-phases with the face-centered cubic (FCC) structure, hexagonal close-packed (HCP) structure and L12 structure, respectively. The alloy exhibited a remarkable combination of tensile yield strength (gigapascal scale) and plasticity (uniform strain over 30%) at both room and cryogenic temperatures. The cooperative operation of multiple mechanisms consisting of refined-grain strengthening, second-phase strengthening, precipitation strengthening, stacking faults and phase-transformation toughening was suggested to be responsible for the excellent mechanical response.
Effects of particulate agglomerated degree on deformation behaviors and mechanical properties of in-situ ZrB2 nanoparticles reinforced AA6016 matrix composites by finite element modeling
Authors: Sun Yue , Zhao Yutao , Wu Jili , Kai Xizhou , Zhang Zhenyu , Fang Zheng , Xia Chaoyi
Published: February 2020

In this paper, both the tensile deformation behaviors and mechanical properties of in situ ZrB2 nanoparticles reinforced AA6016 matrix composites are investigated with finite element analysis. For the modeling, the volume fraction of nano ZrB2 particles is defined by combining cluster sizes with particulate agglomerated degree which was observed in the agglomeration clustered regions by experiments. The effects of clusters on the mechanical behaviors of composites are disclosed according to qualify mechanical behaviors of local particulate agglomeration. The results indicate that finite element analysis is performed to predict the Young’s modulus of composites, which is in good agreement with the experimental results. In addition, the speed of stress concentration is faster when the agglomerated degree elevates, which minimizes elongation of composites under the same particle volume fraction. Likewise, under the same agglomerated degree, the higher particle volume fraction of composites triggers the reduction of elongation.
Pre-breakdown phenomena in hydrocarbon liquids in a point-plane gap under step voltage. Part 2: behaviour under negative polarity and comparison with positive polarity
Authors: Lundgaard Lars , Linhjell Dag , Hestad Øystein L , Unge Mikael , Hjortstam Olof
Published: February 2020

This study addresses the dielectric performance of nonpolar hydrocarbon liquids and mineral oils under negative polarity stress. Stopping length for non-breakdown streamers, breakdown voltages and velocities for various pre-breakdown streamer modes have been studied for a selection of model liquids (cyclohexane and white oils), for a gas to liquid oil, and a refined naphthenic transformer oil. Studies of propagation modes were done using an 80 mm point to plane gap and a step voltage with 0.5 μs rise time. Light emission and pre-breakdown currents have been recorded and instantaneous velocities have been derived from images of propagating streamers. Compared to positive polarity, there are less differences in streamer behaviour in the oils examined under negative polarity. Breakdown voltages and acceleration voltages are higher for negative streamers than for positive ones, while their propagation velocities are lower. While propagation modes for positive voltages are quite distinct, the mode changes for negative ones are more gradual. The behaviour of both positive and negative streamers is in line with the hypothesis that the propagation is governed by electron avalanches and quantum chemical properties of liquid components.
Targeted enrichment of 28Si thin films for quantum computing
Authors: Tang K , Kim H S , Ramanayaka A N , Simons D S , Pomeroy J M
Published: February 2020

We report on the growth of isotopically enriched 28Si epitaxial films with precisely controlled enrichment levels, ranging from natural abundance ratio of 92.2% all the way to 99.99987% (0.832 × 10−6 mol mol−1 29Si). Isotopically enriched 28Si is regarded as an ideal host material for semiconducting quantum computing due to the lack of 29Si nuclear spins. However, the detailed mechanisms for quantum decoherence and the exact level of enrichment needed for quantum computing remain unknown. Here we use hyperthermal energy ion beam deposition with silane gas to deposit epitaxial 28Si. We switch the mass selective magnetic field periodically to control the 29Si concentration. We develop a model to predict the residual 29Si isotope fraction based on deposition parameters and measure the deposited film using secondary ion mass spectrometry (SIMS). The measured 29Si concentrations show excellent agreement with the prediction, deviating on average by only 10%.
Maupertuis-Hamilton least action principle in the space of variational parameters for Schrödinger dynamics; A dual time-dependent variational principle
Authors: Takatsuka Kazuo
Published: February 2020

Time-dependent variational principle (TDVP) provides powerful methods in solving the time-dependent Schröinger equation. As such Kan developed a TDVP (Kan 1981 Phys. Rev. A 24, 2831) and found that there is no Legendre transformation in quantum variational principle, suggesting that there is no place for the Maupertuis reduced action to appear in quantum dynamics. This claim is puzzling for the study of quantum–classical correspondence, since the Maupertuis least action principle practically sets the very basic foundation of classical mechanics. Zambrini showed within the theory of stochastic calculus of variations that the Maupertuis least action principle can lead to the Nelson stochastic quantization theory (Zambrini 1984 J. Math. Phys.
25, 1314). We here revisit the basic aspect of TDVP and reveal the hidden roles of Maupertuis-Hamilton least action in the Schrödinger wavepacket dynamics. On this basis we propose a dual least (stationary) action principle, which is composed of two variational functionals; one responsible for ‘energy related dynamics’ and the other for ‘dynamics of wave-flow’. The former is mainly a manifestation of particle nature in wave-particle duality, while the latter represents that of matter wave. It is also shown that by representing the TDVP in terms of these inseparably linked variational functionals the problem of singularity, which is inherent to the standard TDVPs, is resolved. The structure and properties of this TDVP are also discussed.
Latin American Print Culture in the 16th and 17th Centuries: The Colonial Period
Authors: López de Mariscal Blanca
Published: February 2020

The first printing workshops established in New Spain had been entrusted with a particular goal: they were designed to serve as support for the enormous work of indoctrination carried out by the mendicant orders—the so-called evangelization of the indigenous population. The Spanish Crown had assigned the first missionaries with the task of edifying the souls of those inhabitants in its new domains, both the Indians and the Spaniards, as well as creoles and mestizos who formed part of this new society. Therefore, the complex process of evangelization of the Indians became an overwhelming endeavor for the mendicant orders, requiring the support of the printing press.

New works intended for the evangelization of the Indians began to appear, but Indians would not be the readers of such works; instead, their authors provided the missionaries with tools for the process of evangelization. These texts, often bilingual, facilitated communication with the inhabitants of the New World, particularly works on Christian doctrine, confessional manuals, sermons, and grammars (artes de la lengua). Accordingly, these genres were locally produced throughout the 16th century, and designed as instruments for the massive evangelization of the Indians.

When considering the history of the Americas in the 16th and 17th centuries it is crucial to consider the arrival of the first books, the coming of the printing press as an instrument to facilitate evangelization of the New World, reading practices amongst Spaniards and mestizos, the formation of the first libraries, and the establishment of booksellers in the viceroyalties of New Spain and Peru.
Contemporary Asian American Art
Authors: Kina Laura
Published: February 2020

Contemporary Asian American art includes artworks created by artists of Asian heritage in the Americas as well as contemporary works that engage with Asian American or Asian diasporic communities, history, aesthetics, politics, theory, and popular culture. This includes Modern and Postmodern works created in the post-World War II era to the present. Asian American art is closely tied to the birth of the Asian American movement of the 1960s and 70s as well as a wide range of art movements of the same time period from minimalism, to community murals, to the birth of video art, to international conceptual movements such as Fluxus. “Asian American art” is associated with identity based works and began to be institutionalized during the multicultural era of the 1980–1990s. From the early 2000s onwards, Asian American art has shifted to more transnational framework but remains centered on issues of representation, recovery, reclaiming, recuperation, and decolonization of marginalized bodies, histories, and memories. Common themes in Asian American art include narratives of immigration, migration, war, trauma, labor, race and ethnicity, assimilation, dislocation, countering stereotypes, and interrogating histories of colonization and U.S. imperialism.
Mixed-Race Asian Americans and Contemporary Media and Culture
Authors: Nishime LeiLani
Published: February 2020

Mixed-race Asian Americans have long been a part of the visual culture of Asian Americans, yet, like the wider culture, in Asian American studies the figure of the mixed-race Asian American is rarely recognized or acknowledged. This absence is notable given the field’s sustained interest in representations of Asian interracial romantic relationships in both print and visual media. The simplest explanation would be that mixed-race Asian Americans are difficult to recognize visually as Asian. This explanation locates the source of under-representation in the bodies of mixed-race Asian Americans and their failure to signal race correctly. Within that causal logic, some bodies push viewers to categorize those bodies incorrectly as monoracial or as confoundingly ambiguous. Since race is a social fiction, however, it does not simply exist in specific bodies waiting to be read. Instead, the ambiguity of mixed-race Asian representations resides in the exchange between the viewer and the viewed.

The study of visual representations of mixed-race Asians intervenes in this racial narrative. While the visual apprehension of race may appear to bypass culture, the study of representations of mixed-race Asians makes apparent the ways in which the visual is constantly mediated by cultural codes. Race appears to exist on the surface of the body for the viewer to scan. On the contrary, the features that signal racial difference are socially determined, and people are trained to prioritize those features as they enter into culture. Representations of mixed-race Asians often fall outside common racial coding, slowing the process of assigning racial meaning to fetishized features. These bumps in the road open up a space for scholars to denaturalize visual racialization and to begin to unravel the cultural codes that inform readings of racial categories. Rather than looking for a solution to the problem of mixed-race Asian representations, scholars writing on mixed-race Asian Americans focus on visual representations to trouble racial categories and to question what it means to look—or not look—Asian. By tracking the shifting racialized reading of images of mixed-race figures such as Hollywood star Merle Oberon across time and genre, it becomes apparent how cultural context rather than mixed-race bodies shapes the visual apprehension of racial difference.
Indian Dance in Diaspora: US and Australian Contexts
Authors: Srinivasan Priya
Published: February 2020

This article takes a critical and historical look at how South Asian performers and performances circulated in the late 19th and 20th centuries in the United States and Australia. It compares how dance practices, both in the United States and in Australia, are interwoven with 19th- and early 20th-century Orientalism and anti-Asian immigration law in both countries, as primarily white dancers engaged with Indian dance practices to develop intercultural styles of Western contemporary dance. While the comparisons of Indian dance in the United States and Australia highlight the similarities of national policies that curtailed Asian immigration, they also suggest that the patterns of migration and travel, particularly where dance is concerned, are much more complex. Dancers and dance forms moved from India to Australia to the United States in an intricate triangle of exchange and influence.
The Arts and the Art and Science of Management Teaching
Authors: Gallos Joan V.
Published: February 2020

The arts have played a major role in the development of management theory, practice, and education; and artists’ competencies like creativity, inventiveness, aesthetic appreciation, and a design mindset are increasingly vital for individual and organizational success in a competitive global world. The arts have long been used in teaching to: (a) explore human nature and social structures; (b) facilitate cognitive, socioemotional, and behavioral growth; (c) translate theory into action; (d) provide opportunities for professional development; and (e) enhance individual and systemic creativity and capacities for change. Use of literature and films are curricular mainstays. A review of the history of the arts in management teaching and learning illustrates how the arts have expanded our ways of knowing and defining managerial and leadership effectiveness—and the competencies and training necessary for them.

The scholarship of management teaching is large, primarily ‘how-to’ teaching designs and the assessments of them. There is a clear need to expand the research on how and why the arts are and can be used more effectively to educate professionals, enable business growth and new product development, facilitate collaboration and team building, and bring innovative solutions to complex ideas. Research priorities include: the systematic assessments of the state of arts-based management teaching and learning; explorations of stakeholder attitudes and of environmental forces contributing to current educational models and practices; analyses of the learning impact of various pedagogical methods and designs; examining the unique role of the arts in professional education and, especially, in teaching for effective action; mining critical research from education, psychology, creativity studies, and other relevant disciplines to strengthen management teaching and learning; and probing how to teach complex skills like innovative thinking and creativity. Research on new roles and uses for the arts provide a foundation for a creative revisiting of 21st-century management education and training.
Geographic Information Systems and Location Analytics for Business and Management
Authors: Keenan Peter
Published: February 2020

A geographic information system (GIS) is a system designed to capture, store, organize, and present spatial data, which is referenced to locations on the Earth. Locational information is of value for a wide range of human activities for decision-making relating to these activities. As spatial data is relatively complex, GIS represents a challenging computer application that has developed later than some other forms of computer systems. GIS uses spatial data for a region of the Earth; such regional data are of interest to a wide range of users whose activities take place in that region, and so many users in otherwise disconnected domains share spatial data. The availability and cost of spatial data are important drivers of GIS use, and the sourcing and integration of spatial data are continuing research concerns. GIS use now spans a wide range of disciplines, and the diversity created is one of the obstacles to a well-integrated research field.

Location analysis is the use of GIS for general-purpose analysis to determine the preferred geographic placement of human activities. Location analytics uses spatial data and quantitative spatial models to support decision-making, including location analysis. The growth of location analytics reflects the increasing amounts of data now available owing to new data collection technologies such as drones and because of the massive amounts of data collected by the use of mobile devices like smartphones. Location analytics allow many valuable new services that play an important role in new developments such as smart cities. Location analytics techniques potentially allow the tracking of individuals, and this raises many ethical questions, however useful the service provided; therefore, issues related to privacy are of increasing concern to researchers.
Crypto-Discourse, Internet Freedom, and the State
Authors: Hellegren Isadora
Published: February 2020

Internet freedom is a process. Internet freedom takes place through a myriad of practices, such as technology development, media production, and policy work, through which various actors, existing within historical, cultural, economic, and political contexts, continuously seek to determine its meaning. Some of these practices take place within traditional Internet governance structures, yet others take place outside of these. Crypto-discourse refers to a partially fixed instance of the process in which actors seek to construct the meaning of Internet freedom that mainly takes place outside of traditional Internet governance structures.

Crypto-discourse describes a process in which specific communities of crypto-advocates (groups of cryptographers, hackers, online privacy advocates, and technology journalists) attempt to define Internet freedom through community practices such as technological development and descriptive portrayals of encryption within interconnected communities that seek to develop and define encryption software, as well as through the dissemination of these developments and portrayals within and outside of these communities. The discursive work of the cypherpunks, interrelated discourse communities, and related technology journalism is at the core of crypto-discourse. Through crypto-discourse, crypto-advocates employ encryption software as an arena of negotiation. The representation of encryption software serves as a battlefield in a larger discursive struggle to define the meaning of Internet freedom.

Crypto-discourse illustrates how social practices have normative implications for Internet governance debates regarding Internet freedom and in particular expectations for state authorities to uphold online rights. The relationship between freedom and the state that these crypto-advocates articulate as a response to specific events excludes other possible positive notions of Internet freedom in which the state has an obligation to ensure the protection of online rights.
Coordination of Regional Downscaling
Authors: Gutowski William Joseph , Giorgi Filippo
Published: February 2020

Regional climate downscaling has been motivated by the objective to understand how climate processes not resolved by global models can influence the evolution of a region’s climate and by the need to provide climate change information to other sectors, such as water resources, agriculture, and human health, on scales poorly resolved by global models but where impacts are felt. There are four primary approaches to regional downscaling: regional climate models (RCMs), empirical statistical downscaling (ESD), variable resolution global models (VARGCM), and “time-slice” simulations with high-resolution global atmospheric models (HIRGCM). Downscaling using RCMs is often referred to as dynamical downscaling to contrast it with statistical downscaling. Although there have been efforts to coordinate each of these approaches, the predominant effort to coordinate regional downscaling activities has involved RCMs.

Initially, downscaling activities were directed toward specific, individual projects. Typically, there was little similarity between these projects in terms of focus region, resolution, time period, boundary conditions, and phenomena of interest. The lack of coordination hindered evaluation of downscaling methods, because sources of success or problems in downscaling could be specific to model formulation, phenomena studied, or the method itself. This prompted the organization of the first dynamical-downscaling intercomparison projects in the 1990s and early 2000s. These programs and several others following provided coordination focused on an individual region and an opportunity to understand sources of differences between downscaling models while overall illustrating the capabilities of dynamical downscaling for representing climatologically important regional phenomena. However, coordination between programs was limited.

Recognition of the need for further coordination led to the formation of the Coordinated Regional Downscaling Experiment (CORDEX) under the auspices of the World Climate Research Programme (WCRP). Initial CORDEX efforts focused on establishing and performing a common framework for carrying out dynamically downscaled simulations over multiple regions around the world. This framework has now become an organizing structure for downscaling activities around the world. Further efforts under the CORDEX program have strengthened the program’s scientific motivations, such as assessing added value in downscaling, regional human influences on climate, coupled ocean­–land–atmosphere modeling, precipitation systems, extreme events, and local wind systems. In addition, CORDEX is promoting expanded efforts to compare capabilities of all downscaling methods for producing regional information. The efforts are motivated in part by the scientific goal to understand thoroughly regional climate and its change and by the growing need for climate information to assist climate services for a multitude of climate-impacted sectors.
Projected Oceanographical Changes in the Baltic Sea until 2100
Authors: Meier H.E. Markus , Saraiva Sofia
Published: February 2020

In this article, the concepts and background of regional climate modeling of the future Baltic Sea are summarized and state-of-the-art projections, climate change impact studies, and challenges are discussed. The focus is on projected oceanographic changes in future climate. However, as these changes may have a significant impact on biogeochemical cycling, nutrient load scenario simulations in future climates are briefly discussed as well. The Baltic Sea is special compared to other coastal seas as it is a tideless, semi-enclosed sea with large freshwater and nutrient supply from a partly heavily populated catchment area and a long response time of about 30 years, and as it is, in the early 21st century, warming faster than any other coastal sea in the world. Hence, policymakers request the development of nutrient load abatement strategies in future climate. For this purpose, large ensembles of coupled climate–environmental scenario simulations based upon high-resolution circulation models were developed to estimate changes in water temperature, salinity, sea-ice cover, sea level, oxygen, nutrient, and phytoplankton concentrations, and water transparency, together with uncertainty ranges. Uncertainties in scenario simulations of the Baltic Sea are considerable. Sources of uncertainties are global and regional climate model biases, natural variability, and unknown greenhouse gas emission and nutrient load scenarios. Unknown early 21st-century and future bioavailable nutrient loads from land and atmosphere and the experimental setup of the dynamical downscaling technique are perhaps the largest sources of uncertainties for marine biogeochemistry projections. The high uncertainties might potentially be reducible through investments in new multi-model ensemble simulations that are built on better experimental setups, improved models, and more plausible nutrient loads. The development of community models for the Baltic Sea region with improved performance and common coordinated experiments of scenario simulations is recommended.