bluuebunny/crossref_metadata_2025 huggingface dataset:
Can non-pharmacological interventions improve sleep quality for haemodialysis patients?
Authors: Edley Ruth
Published: February 2020

Poor sleep quality is a major issue for haemodialysis (HD) patients, with as many as 80% reporting problems with sleep. Poor sleep has a negative impact on HD patients' mental health, quality of life and day-to-day functioning, along with increasing morbidity and mortality risks. Non-pharmacological interventions have fewer side-effects compared to hypnotic medications and have been shown to be effective in research studies. Ruth Edley examines acupressure, massage, aerobic and non-aerobic exercise and cognitive behavioural therapy. All have been shown in small-scale studies to improve sleep quality in HD patients, although no intervention has been found to improve sleep quality to normal levels. It is recommended that further research using larger, randomised controlled trials is undertaken to increase confidence in the benefits of these interventions.
Pseudo paralysis of the shoulder and increased C-reactive protein are predictive factors for septic shoulder in children superior to other clinical symptoms: A retrospective case series of 25 patients
Authors: Danilov Cezara , Ihle Christoph , Fernandez Francisco F. , Blumenstock Gunnar , Wirth Thomas , Eberhardt Oliver
Published: February 2020

Purpose

The aim of the study was to evaluate predictable parameters with the highest sensitivity used in the diagnosis of children septic shoulder arthritis.

Methods

All children treated in our paediatric orthopaedic hospital between 2000 and 2017 with intraoperative verified septic arthritis of the shoulder were included in this retrospective study. Diagnostic procedures e.g. ultrasound, MRI, radiograph or blood samples as well as typical clinical symptoms were evaluated as predictable parameters for septic shoulder arthritis in paediatric patients. Descriptive statistics as well as sensitivity analysis were performed.

Results

In all, 25 children, 20 boys and five girls, aged from eight days to 15 years, were included for further statistical analysis. All parameters included were tested for sensitivity with binomial confidence intervals (Cis) of 95%. Predictive parameters with highest sensitivity were pseudo paralysis (100%, CI 0.86 to 1.00) and C-reactive protein (CRP) (96%, CI 0.79 to 0.99) superior to temperature (52%, CI 0.3 to 0.73), white blood count (11%, CI 0.01 to 0.34), radiograph (21%, CI 0.04 to 0.50), ultrasound (71%, CI 0.47 to 0.88) or MRI (100%, CI 0.78 to 1.00).

Conclusion

The diagnosis of a septic arthritis of the shoulder in children can be challenging for the clinician and especially for the resident doctor. Clinical symptoms such as pseudo paralysis and increased CRP level must be considered as predictive markers not to delay further diagnostics and treatment.

Level of Evidence

IV
Pseudomonas plecoglossicida as a novel bacterium for phosphate solubilizing and indole-3-acetic acid-producing from soybean rhizospheric soils of East Java, Indonesia
Authors: Astriani Meli , SITI ZUBAIDAH  , ABDUL LATIEF ABADI  , ENDANG SUARSINI
Published: February 2020

Abstract. Astriani M, Zubaidah S, Abadi AL, Suarsini E. 2020. Pseudomonas plecoglossicida as a novel bacterium for phosphate solubilizing and indole-3-acetic acid-producing from soybean rhizospheric soils of East Java, Indonesia. Biodiversitas 21: 578-586. The use of synthetic fertilizers to grow soybean (Glycine max (L.) Merrill) in a long time, can increase the risk of environmental damage. Therefore, the current study aimed to find phosphate solubilizing bacteria that can produce indole-3-acetic acid (IAA) hormone to minimize the use of chemical fertilizers. Superior isolates selected through characterization of phosphate solubilization activity on Pikovskaya medium, screening of IAA producing bacteria, quantitative estimation of phosphate solubilizing activity using a spectrophotometer, hypersensitivity assay, antagonist within isolate assay, and molecular identification of selected bacterial isolates using 16S rRNA sequencing with primer forward 63f and primer reverse 1387r. Among the isolated bacteria, isolate Arj8 showed the highest phosphate solubilizing activity and IAA production. Molecular identification indicated that isolate Arj8 shared 100% similarity with Pseudomonas plecoglossicida. The highest phosphate solubilizing activity (75.39 mg/L) and IAA production (38.89 ppm) recorded on day-3. Multiple potentialities of P. plecoglossicida as phosphate solubilizing and IAA producing bacterium are a novel finding in the development of bioinoculants as bio-fertilizers that can reduce dependency on synthetic chemical fertilizers.
Phenotypic characters and genetic variations of lurik peanuts (Arachis hypogaea L. var. lurikensis) with Inter Simple Sequence Repeat
Authors: - Ikhsanudin Nur Rosyidi , Budi Setiadi Daryono
Published: February 2020

Abstract. Rosyidi IN, Daryono BS. 2020. Phenotypic characters and genetic variations of lurik peanuts (Arachis hypogaea L. var. lurikensis) with Inter Simple Sequence Repeat. Biodiversitas 21: 629-635. Agriculture is a sector that supports national development, one of its commodities is peanut (Arachis hypogaea L.). The needs and demand for peanuts from the food industry sector increased throughout time. However, the current national production level is unable to fulfill the demand, so the number of peanut imports increased sharply.  Based on this condition, researches to improve peanuts production using Lurik peanuts should be held as a solution to fulfill the need for national consumption because lurik peanuts have a greater number of pods and seeds. This research was aimed to improve the quality and quantity of Lurik peanuts phenotype and analyze the successes through the variations and its molecular character. This research was done in May - July 2018 in Mutihan, Madurejo, Prambanan, Sleman, Yogyakarta and in the Laboratory of Genetics and Breeding of Faculty of Biology, Universitas Gadjah Mada (UGM), Yogyakarta, Indonesia. In this research, Lurik peanuts improvement was conducted by selection and induction with colchicine. The Data was collected qualitatively using Inter Simple Sequence Repeat (ISSR) with  ISSR 8, ISSR 9, UBC 825, UBC 841 primers and electrophoresis while the quantitative method was done using plant phenotype measurement and spectrophotometry, then followed by data analysis using one-way ANOVA and MVSP 3.1 program. The results of this research showed that the characters of Lurik peanuts were different from common peanuts such as in having higher plants, different numbers of seeds per pod, and pattern on the seed coat. These data were supported by the molecular results, with similarity index at 84% meaning that the Lurik peanuts and common peanuts are classified as one same species.
Diversity of black pepper plant (Piper nigrum) in Bangka Island (Indonesia) based on agro-morphological characters
Authors: Prayoga Gigih Ibnu , Ropalia Ropalia , Aini Sitti Nurul , Mustikarini Eries Dyah , Rosalin Yuniar
Published: February 2020

Abstract. Prayoga GP, Aini SN, Mustikarini, ED, Rosalin Y. 2020. Diversity of black pepper plant (Piper nigrum L.) in Bangka Island (Indonesia) based on agro-morphological characters. Biodiversitas 21: 652-660. Black pepper (Piper nigrum L.) production in Bangka Belitung Islands Province continued to decrease in 2014-2017. Efforts to increase black pepper production was carried out by providing superior varieties that began with an increase in the genetic diversity of black pepper plants. Increasing the genetic diversity of black pepper can be done through black pepper germplasm exploration activities followed by characterization. The research aimed to obtain the agro-morphological characteristics of black pepper plants in Bangka island. Exploration was carried out by survey method in four regencies in Bangka Island. The research method used a survey method with convenience sampling technique. Observation of agro-morphological characters was carried out in accordance with the descriptor for black pepper from IPGRI (1995). The results of exploration of black pepper plants in Bangka Island have found 9 accessions of black pepper plants, consisting of 5 cultivars were Lampung Daun Lebar (LDL), Lampung Daun Kecil (LDK), Chunuk, and Jambi and 4 landraces namely Bogor, Peremis, Keriwil, and Merapin Daun Kecil (MDK). There were morphological differences in 9 accessions of black pepper plants, namely leaf lamina shape, leaf vein, leaf margin, lateral branch habit, leaf base shape, ripe fruit color, hanging vines, ground vines, and stem shape. Agro-morphological relationship of 9 accessions of black pepper plants can be divided into 5 clusters at a 50% similarity level. Based on this study, black pepper breeding program on Bangka Island could be done accessions of Peremis, Bogor, Nyelungkup, and Jambi as genetic sources. Furthermore, selection would be better to use length of petiole, length of stem segment, fruit size, percentage of perfect fruit, weight of 1000 fruits, and the weight of 1000 dried seeds as the selection criteria.
Seed coating with biological agents to improve the quality of rice seeds contaminated with blast pathogens and increase seedling growth
Authors: PALUPI TANTRI , FADJAR RIYANTO
Published: February 2020

Abstract. Palupi T, Riyanto F. 2020. Seed coating with biological agents to improve the quality of rice seeds contaminated with blast pathogens and increase seedling growth. Biodiversitas 21: 683-688. The aim of this research were (1) to evaluate the compatibility of five biological agents (SP21, SP31, RP21, TP12, and TP11), (2) to evaluate the physical and physiological quality of rice seeds contaminated with Pyricularia grisea after being treated with seed coating enriched with biological agents, (3) to evaluate the effectiveness of seed coating on the incidence of blast disease and seedling growth. The first experiment tested the compatibility of five bacterial antagonists on the PSA plates. There were eight treatments in the second experiment namely seed coating enriched with SP21+SP31; SP21+RP21; SP21+TP12; SP31+RP21; RP21+TP11; fungicides; positive control (rice seeds contaminated with blast), and negative control (healthy seeds), and seven treatments in the third experiment which were the same as in experiment 2 without negative control. Parameters observed in the second experiment were: seed germination, vigor index, and growth rate, while parameters observed in the 3rd experiment were the incidence rate of blast disease and plant height. The results of experiment 1 showed that isolates SP21+SP3, SP21+RP21, SP21+TP12, SP31+RP21, and RP21+TP11 had good growth compatibility without antagonism, and they can be used as biocontrol agents. Results of experiment 2 showed that seed coating enriched with SP21+SP31 isolates has the potential to improve the physical and physiological quality of the seeds. Results of experiment 3 showed that seed coating enriched with RP21+TP11 had no incidence of blast disease up to 4 weeks after planting.
Short Communication: Community structure and diversity of Odonata in Suranadi Natural Park, West Lombok Indonesia
Authors: MOHAMMAD LIWA ILHAMDI  , AGIL AL IDRUS  , DIDIK SANTOSO  , Hadiprayitno Gito
Published: February 2020

Abstract. Ilhamdi ML, Al Idrus A, Santoso D, Hadiprayitno G. 2020. Short Communication: Community structure and diversity of Odonata in Suranadi Natural Park, West Lombok Indonesia. Biodiversitas 21: 718-723. Odonata is an order of insects. The life cycle of this order is dependent on freshwater habitat. Sensitivity to environmental changes causes odonates to be important bioindicators of ecosystem change. The importance of the ecological role of odonates is not followed by adequate scientific information on Odonata communities, especially in the Suranadi Natural Park (SNP). The study aimed to monitor the existence and community structure of Odonata in the SNP area every six months in period. The data collection technique was using a survey method by following the transect line, namely the waterway transect line (WTL), plantation border transect (PT) and settlement border transect (ST). Data collection was done 4 times from April to May 2019, once every 2 weeks. The sampling was done twice in the morning from 08.00 to 11.00 AM and in the afternoon from 03.00 to 05.00 PM. Data were analyzed using the relative frequency equation and Diversity Index. The results showed that there were 16 species of odonates consisting of the family Libellulidae (11 species), Platycnemididae (1 species), Chlorocyphidae (1 species), and Coegrinidae (3 species). Orthetrum sabina, Neurothemis ramburii, Diplacodes trivialis, Gynacantha subinterrupta, Copera marginipes, and Pantala flavescens, are species that are present in all of each observation sites. The waterway transect has the highest diversity index (2.027), followed by settlement transect (1.367), and the lowest is plantation transect (1.131).
Influence of furrow with organic material and Chromolaena odorata compost on upland rice productivity in an agroforestry system with Melaleuca cajuputi
Authors: PRIYONO SURYANTO  , BUDIASTUTI KURNIASIH  , ENY FARIDAH  , HANDOJO HADI NURJANTO  , ROHLAN ROGOMULYO  , SUCI HANDAYANI  , DODY KASTONO  , ANDI SYAHID MUTTAQIEN  , Alam Taufan
Published: February 2020

Abstract. Suryanto P, Kurniasih B, Faridah E, Nurjanto HH, Rogomulyo R, Handayani S, Kastono D, Muttaqien AS, Alam T. 2020. Influence of furrow with organic material and Chromolaena odorata compost on upland rice productivity in an agroforestry system with Melaleuca cajuputi. Biodiversitas 21: 780-791. The main problems of rainfed areas for upland rice cultivation in agroforestry system with Melaleuca cajuputi (kayu putih) were limited to soil moisture availability and low fertility of the soil. The experiment was conducted from March to August 2018 in Menggoran Forest Resort, Playen Forest Section, Yogyakarta Forest Management District, Indonesia. The experiment was arranged in strip plot design with three blocks as replications. The vertical plots were rainwater harvesting technique (RHT) consist of without furrow (WF) and furrow with organic material (FWOM). The horizontal plot was Chromolaena odorata (siam weed) compost (SWC) applications consist of 0, 5, 10, and 15 tons ha-1. The data analyzed by ANCOVA, ANOVA, SEM, and stepwise regression. The results of the study informed that the FWOM with SWC of 10 tons ha-1 showed the highest yield of upland rice per hectare was 2.97 tons ha-1 and yields increased by 91.75% compared to the WF without SWC. The environmental variables that significantly affected the yield of upland rice were WUE and Tsoil. The growth variables that significantly affected the yield of upland rice were SDW, RSA, and RDW. The yield component that had a very significant affected on the yield of upland rice was NP.
Identification of interspecific hybrid between Jatropha curcas × J. integerrima using morphological and molecular markers
Authors: SAPTADI DARMAWAN , NUR ASBANI  , BAMBANG HELIYANTO  , ASEP SETIAWAN  , SUDARSONO
Published: February 2020

Abstract. Saptadi D, Asbani N, Heliyanto B, Setiawan A, Sudarsono. 2020. Identification of interspecific hybrid between Jatropha curcas x J. integerrima using morphological and molecular markers. Biodiversitas 21: 814-823. Eight F1 progenies derived from Jatropha curcas × J. integerrima hybridizations were evaluated for their morphological characters and using RAPD, ISSR and SSR markers. Morphological variations among the hybrids were limited and they were intermediate between the Jatropha parents. The eight F1 progenies derived from J. curcas × J. integerrima hybridizations were most probably the interspecific F1 hybrids. The confirmed identity of the progenies as interspecific hybrids between J. curcas × J. integerrima was based on the presence of several phenotypic characters from both parents in the F1 progenies and by similarity of the molecular marker banding patterns among the parents and the F1 progenies. Among the evaluated molecular markers, the ISSR primers and the majority of either RAPD and SSR primers were not able to generate marker for confirming the identity of F1 progenies as interspecific hybrids between J. curcas × J. integerrima. However, the RAPD primer OPC 10 and the SSR primers AF469003, EU099522 and EU586348 were able to generate polymorphic markers in the Jatropha parents and their F1 progenies. Therefore, these four primers were able to generate usable markers for confirming the identity of F1 progenies as interspecific hybrids between J. curcas × J. integerrima. The evaluated interspecific F1 progenies are potentially useful to increase genetic diversity of J. curcas and support its breeding program.
Unraveling genetic variations of Dalbergia latifolia (Fabaceae) from Yogyakarta and Lombok Island, Indonesia
Authors: Yulita Kusumadewi S. , TIKA D. ATIKAH  , WITA WARDANI  , SUSILA
Published: February 2020

Abstract. Yulita KS, Atikah TD, Wardani W, Susila. 2020. Unraveling genetic variations of Dalbergia latifolia (Fabaceae) from Yogyakarta and Lombok Island, Indonesia. Biodiversitas 21: 833-841. Dalbergia latifolia Roxb. (Fabaceae) or sonokeling is a timber species extracted for its beautiful heartwood used mainly for musical instruments. D. latifolia was listed in Appendix 2 of CITES since 1997, and the demand for its timber is increasing. The species is considered vulnerable (VU A1cd ver 2.3) to extinction according to the IUCN Red List, while cultivations were mainly done from a root cutting. To anticipate the further loss of population size while maintaining sustainable use of the species, it is essential to evaluate the genetic diversity since the genetic diversity level could serve as an indicator of plant adaptability to its environment. This present study was the first to report the genetic diversity of five populations of D. latifolia from Yogyakarta and Lombok Island, West Nusa Tenggara, Indonesia. Ten combinations of Sequence Random Amplified Polymorphism (SRAP) primers were used to amplify 48 samples of D. latifolia from five populations in Yogyakarta and Lombok Island. The 137 SRAP loci were used for a cluster, and population genetic analysis, with mean NPL, was of 13.6/locus, PLP of 56.18%, H of 0.16, and PIC for all population was of 0.28. The lowest gene diversity (H = 0.11) was observed in population WL 1 of Lombok Island, while the highest (H = 0.20) was recorded for population KP of Yogyakarta. The Yogyakarta and Lombok populations were genetically structured at a medium level (Gst = 0.27), with low genetic distance (0.0310-0.1281), and a moderate level of variation observed among individual trees (ca. 0.5 coefficient similarity). The results of this present study were expected to provide necessary information on further research of D. latifolia from Indonesia to support the sustainable use of D. latifolia in Indonesia and the preservation of this species.
Ex-situ population of White-rumped Shama (Copsychus malabaricus): studies of density, distribution and bird keepers in Bengkulu, Sumatra
Authors: Putranto Heri Dwi , BIENG BRATA  , YOSSIE YUMIATI
Published: February 2020

Abstract. Putranto HD, Brata B, Yumiati Y. 2020. Ex-situ population of White-rumped Shama (Copsychus malabaricus): Studies of density, distribution and bird keepers in Bengkulu, Sumatra. Biodiversitas 21: 865-874. Purpose of this research was to estimate number of White-rumped Shama (Copsychus malabaricus) or locally known as murai batu which are kept by Bengkulu's bird keepers, analyze its population density, population distribution, and the profile of bird keepers. Researcher used field observation method by conducting interviews during June-September 2019. Respondents were determined using purposive sampling method and sampling was continued by snowball sampling method. Bird population data were analyzed by using population density formula and population distribution formula, while profile of bird keepers was analyzed descriptively. In 9 sub-districts of Bengkulu City total of 642 birds that are kept by bird keepers in ex-situ habitat, consisting of 434 males and 208 females with sex ratio approximately of 2:1. Population density was 4.23 birds per km2 (2.86 male birds/km2 and 1.37 female birds/km2). Population distribution by a Variance-Mean Ratio formula was 4.8 or VMR > 1. Furthermore, there were 79 keepers consist of 78 male bird keepers (98.7% ) and 1 female keeper (1.27%). Eleven bird keepers (13.9%) were categorized as captive breeders and 68 keepers (86.1%) were categorized as bird hobbyists. In conclusion, density population of ex-situ White-rumped Shama in Bengkulu City was 4.23 birds per km2, and population distribution interpreted as negative binomial distribution. Bird keepers were divided into two groups, captive breeders and bird hobbyists.
Morphological variations and phylogenetic analysis of Oryzias nigrimas Kottelat, 1990 (Rice fish) from Lake Poso, Central Sulawesi, Indonesia
Authors: SERDIATI NOVALINA , DIANA ARFIATI  , MAHENO SRI WIDODO  , TRI JOKO LELONO  , SAMLIOK NDOBE  , RUDY SARANGA
Published: February 2020

Abstract. Serdiati N, Arfiati D, Widodo MS, Lelono TJ, Ndobe S, Saranga R. 2020. Morphological variations and phylogenetic analysis of Oryzias nigrimas Kottelat, 1990 (Rice fish) from Lake Poso, Central Sulawesi, Indonesia. Biodiversitas 21: 882-888. Rice fish (Oryzias nigrimas Kottelat, 1990) is a well-studied species endemic to Lake Poso, Sulawesi and identified as scarce. This study aims to identify the Rice fish of Lake Poso, Central Sulawesi based on morphological characters (15 morphometric characters and 5 meristic counts) and phylogenetic analysis using maximum-likelihood (ML) method based on mtDNA, CO1 gene. Based on the morphological analysis, it was showed that the meristic counts show significantly different only on the lateral line scale. However, the morphometric measurements show significantly different characteristics on postorbital distance, body depth, and length of jaw. Our phylogenetic analysis also showed that our samples are indeed a species of O. nigrimas. We suggest that the endemicity of this Rice fish on Lake Poso is greatly influenced by the well-maintained genetic structure of the population.
Stability analysis of silver nanoparticle suspensions by cyclic voltammetry
Authors: Navarrete M. , Mayen-Mondragon R. , Sato R. , Mejía E. V. , Aguirre-Aguirre D. , Genesca J.
Published: February 2020

We report the application of cyclic voltammetry and absorption spectroscopy to the characterization and study of the stability of silver colloids in water. The samples are prepared via chemical reduction and the reactions are catalyzed by irradiation with white light. The electrochemical response is related to the characteristic sample surface plasmon resonance (SPR) in the UV-visible absorption spectra. Cyclic voltammetry shows a characteristic reduction peak whose position is specific to each analyzed sample. Optical analysis of a colloid precursor during a 12 h time span, under low-power white-light irradiation, shows that nanoparticles undergo change in size and surface state (absorption bands splitting and inversion) to attain the “stable” colloidal form. While the absorption spectrum bands of the precursor return almost periodically to similar positions, the cyclic voltammogram characteristic reduction peak is displaced as a function of time. Finally, we follow the SPR changes of one “stable” colloid being subjected to electrolysis, heating, and sunlight irradiation, for environmental remediation purposes. Sunlight exposure produces the most significant SPR intensity drop, but the electrochemical technique shows itself promising as well.
Concealed object enhancement using multi-polarization information for passive millimeter and terahertz wave security screening
Authors: Cheng Yayun , Wang Yingxin , Niu Yingying , Zhao Ziran
Published: February 2020

Passive millimeter and terahertz wave imaging has become a significant potential technique for human security check and scene monitoring. Due to the small difference of the brightness temperatures between human body and concealed objects, the temperature sensitivity and spatial resolution of radiometers are always the key performance indexes which are difficult to improve. Therefore, when the hardware performance is given, improving detectivity becomes a pressing need. In this paper, a physically-based concealed object enhancement method using multi-polarization information is presented. The polarization model and polarization property of human body and concealed objects have been analyzed. By fusing multiple polarization images, we can obtain a complete polarization image in which the contrast between human body and concealed objects is enhanced and stable. The experimental results of simulation and measurement demonstrate the enhancement performance, and Differential Signal Noise Ratio (DSNR) is obviously improved by using the proposed method.
Multi-incidence digital holographic profilometry with high axial resolution and enlarged measurement range
Authors: Martinez-Carranza Juan , Mikuła-Zdańkowska Marta , Ziemczonok Michał , Kozacki Tomasz
Published: February 2020

In this work, multi-incident digital holographic profilometry for microscale measurements is presented. This technique assembles the set of object fields from captured holograms for generation of the longitudinal scanning function (LSF). Numerical propagation is used for refocusing, and thus, the LSF can be determined at any given plane along the optical axis. The LSF takes maximum value for in focus object points, which are used to obtain full-field height distribution of the sample. This principle is the base of proposed measurement technique. Three capturing holograms strategies, which give control over the shape of the LSF, unambiguous measurement range, axial resolution, and noise immunity, are discussed. The conclusions of this work are supported by numerical and experimental results.
Bound state and non-Markovian dynamics of a quantum emitter around a surface plasmonic nanostructure
Authors: Wen Sha-Sha , Huang Yong-Gang , Wang Xiao-Yun , Liu Jie , Li Yun , Quan Xiu-E , Yang Hong , Peng Jin-Zhang , Deng Ke , Zhao He-Ping
Published: February 2020

A bound state between a quantum emitter (QE) and surface plasmon polaritons (SPPs) can be formed, where the excited QE will not relax completely to its ground state and is partially stabilized in its excited state after a long time. We develop some theoretical methods for investigating this problem and show how to form such a bound state and its effect on the non-Markovian decay dynamics. We put forward an efficient numerical approach for calculating the analytical part of the self-energy for frequency below the lower energy threshold. We also propose an efficient formalism for obtaining the long-time value of the excited-state population without calculating the eigenfrequency of the bound state or performing a time evolution of the system, in which the probability amplitude for the excited state in the steady limit is equal to one minus the integral of the evolution spectrum over the positive frequency range. With the above two quantities obtained, we show that the non-Markovian decay dynamics of an initially excited QE can be efficiently obtained by the method based on the Green’s function expression for the evolution operator when a bound state exists. A general criterion for identifying the existence of a bound state is presented. The performances of the above methods are numerically demonstrated for a QE located around a metal nanosphere and in a gap plasmonic nanocavity. Numerical results show that these methods work well and the QE becomes partially stabilized in its excited state at a long time for the transition dipole moment beyond its critical value. In addition, it is also found that this critical value is heavily dependent on the distance between the QE and the metal surface, but nearly independent on the size of the nanosphere or the rod. Our methods can be utilized to understand the suppressed decay dynamics for a QE in an open quantum system and provide a general picture on how to form such a bound state.
Graphene-based hyperbolic metamaterial as a switchable reflection modulator
Authors: Pianelli Alessandro , Kowerdziej Rafał , Dudek Michał , Sielezin Karol , Olifierczuk Marek , Parka Janusz
Published: February 2020

A tunable graphene-based hyperbolic metamaterial is designed and numerically investigated in the mid-infrared frequencies. Theoretical analysis proves that by adjusting the chemical potential of graphene from 0.2 eV to 0.8 eV, the reflectance can be blue-shifted up to 2.3 µm. Furthermore, by modifying the number of graphene monolayers in the hyperbolic metamaterial stack, we are able to shift the plasmonic resonance up to 3.6 µm. Elliptic and type II hyperbolic dispersions are shown for three considered structures. Importantly, a blue/red-shift and switching of the reflectance are reported at different incident angles in TE/TM modes. The obtained results clearly show that graphene-based hyperbolic metamaterials with reversibly controlled tunability may be used in the next generation of nonlinear tunable and reversibly switchable devices operating in the mid-IR range.
Influence of the pump scheme on the output power and the intensity noise of a single-frequency continuous-wave laser
Authors: Guo Yongrui , Peng Weina , Su Jing , Lu Huadong , Peng Kunchi
Published: February 2020

The influence of the pump scheme on the intensity noise of the single-frequency continuous-wave (CW) laser is investigated in this paper, which is implemented in a single-frequency CW Nd:YVO4 1064 nm laser by comparing the traditional 808 nm pumping scheme (TPS) to the direct 888 nm pumping scheme (DPS). Under the conditions that the lasers with TPS and DPS have the same cavity structure and the cavity mirrors, as well as the same operation state including the thermal lens of the laser crystals and the mode-matching between the pump laser mode and the laser cavity mode at the laser crystals, the output power of the laser with DPS is up-to 32.0 W, which is far higher than that of 21.1 W for the laser with TPS. However, the intensity noise of the DPS laser including resonant relaxation oscillation (RRO) frequency of 809 kHz, RRO peak amplitude of 31.6 dB/Hz above the shot noise level (SNL) and the SNL cutoff frequency of 4.2 MHz, respectively, is also higher than that of 606 kHz, 20.4 dB/Hz and 2.4 MHz for the TPS laser. After further analyses, we find that the laser crystal with high doping concentration and long optical length is employed for DPS laser in order to improve the pump laser absorption efficiency, which can simultaneously increase the dipole coupling between the active atoms and the laser cavity, and then results in a high RRO frequency with a large amplitude peak as well as a high SNL cutoff frequency of the laser.
Real-time measurement of complex fast signals by bandwidth compression in frequency shifting loops
Authors: Schnébelin Côme , Cortés Luis Romero , Azaña José , de Chatellus Hugues Guillet
Published: February 2020

We report coherent time-to-frequency mapping in frequency shifting loops (FSLs). We show that when seeded by a temporal signal shorter than the inverse of the frequency shift per roundtrip, the optical spectrum at the FSL output consists of a periodic replica of the input waveform, whose temporal amplitude and phase profiles are mapped into the frequency domain. We provide an experimental demonstration of this phenomenon and show how this simple setup enables real-time measurement of fast non-repetitive input RF signals with a detection chain two orders of magnitude slower than the input signal.
Optical circular dichroism engineering in chiral metamaterials utilizing a deep learning network
Authors: Tao Zilong , You Jie , Zhang Jun , Zheng Xin , Liu Hengzhu , Jiang Tian
Published: February 2020

Here, a deep learning (DL) algorithm based on deep neural networks is proposed and employed to predict the chiroptical response of two-dimensional (2D) chiral metamaterials. Specifically, these 2D metamaterials contain nine types of left-handed nanostructure arrays, including U-like, T-like, and I-like shapes. Both the traditional rigorous coupled wave analysis (RCWA) method and DL approach are utilized to study the circular dichroism (CD) in higher-order diffraction beams. One common feature of these chiral metamaterials is that they all exhibit the weakest intensity but the strongest CD response in the third-order diffracted beams. Our work suggests that the DL model can predict CD performance of a 2D chiral nanostructure with a computational speed that is four orders of magnitude faster than RCWA but preserves high accuracy. The DL model introduced in this work shows great potentials in exploring various chiroptical interactions in metamaterials and accelerating the design of hypersensitive photonic devices.
High-power back-to-back dual-absorption germanium photodetector
Authors: Li Xiuli , Peng Linzhi , Liu Zhi , Liu Xiangquan , Zheng Jun , Zuo Yuhua , Xue Chunlai , Cheng Buwen
Published: February 2020

A high-power germanium photodetector is designed and fabricated using a cold-wall ultrahigh vacuum chemical vapor deposition. A back-to-back dual-absorption structure improves high-power characteristics by reducing the space-charge effect. Compared to a typical p-i-n photodetector, the saturated photocurrent of the back-to-back dual-absorption photodetector is improved from 16.2 to 21.3 mA at

−

3

V

. At a bias voltage of

−

1

V

, the dark current is 1.31 µA. The optical responsivities are 0.31 and 0.52 A/W at 1550 and 1310 nm, respectively. The 3 dB bandwidth of 4.14 GHz is achieved at

−

3

V

. Theoretically, the 3 dB bandwidth can be further optimized in future device fabrication.
Optical microwave generation with an ultra-stable Fabry–Perot cavity in a laser diode self-injection loop
Authors: Zheng Fasong , Fang Fang , Chen Weiliang , Dai Shaoyang , Liu Kun , Li Tianchu
Published: February 2020

The optical microwave generation scheme with an ultra-stable Fabry–Perot cavity (USC) in a self-injection loop of laser diode (LD) is proposed and experimentally demonstrated for the first time, to the best of our knowledge, in this Letter. Using an USC as the mode selector, an injection light is obtained with coherent and equidistant comb-like modes, which are separated by integer multiples of the free spectral range (FSR) of the USC in frequency domain. After injecting back to the LD, the lasing modes are referenced to these comb-like modes, and the microwaves with frequencies of integer multiples of the USC FSR are obtained from the beating signal of detection photodiode. For the microwaves at frequencies of one FSR and two FSRs, the signal-to-noise ratios are better than 60 dB, and the 3 dB linewidths are below 16 Hz. The phase noises and the frequency stability of the generated microwave are also investigated experimentally.
Ordinary Extraordinary Activism: Student-led filmmaking in disability studies
Authors: Jones Chelsea Temple , Collins Kim
Published: February 2020

In this article, we, as disability studies educators in Toronto, Canada, reflect on our interpretations of a student group's call to 'people' disability culture. This request tasked us with mapping disability culture in Canada, and representing it through the arts-based approach of new disability documentary. We produced five student-directed films, Ordinary Extraordinary Activism, that bridge theory with lived experience by profiling activists whose lives involve participating in disability culture. Here, we describe how our work supported and transcended the affirmative model by drawing on intersectionality and Disability Justice. We critically consider the aesthetic and representational tensions of producing films under crip time. Through this writing, we reflect on the three-year process of filmmaking as a gesture of online pedagogy and analyse three out of five films.
Rippling excesses: A/r/tography becoming dis/a/r/tography
Authors: Roman Leslie G. , del pieve gobbi rena , Beaudry Jonas-Sébastien , Blackbridge Persimmon
Published: February 2020

How do disability arts (dis/arts) and culture rupture and transform conventional artistic and a/r/tographic practices? We show how disability arts and culture involves a multiplicity of voices unfolding, recursing, rippling and reflexively performing public pedagogy to make the Wingspan retreat of artists and scholars. We revisit both Hofstadter's formalistic and ahistorical conception of recursion and Irwin's a/r/tography to ask how artistic practices and genres reflexively transform. Our research foregrounds disability collectivity without forsaking individuality, fragilities, strengths, differences of disability that require accommodation and communication beyond the binaries of ability/disability, and, purported 'normalcy' and 'irregularity'. This article artistically and intellectually plays both with the unfolding of a/r/tography as recursive processes often in tension and contention with discourses of 'ability' and 'normalcy' that so bind who counts as valued human beings (or not) and whose semiotic excesses matter. Recursive transformations may become larger sociocultural movements of disability politics and collectives with history, agency and polyvocality. To respect such differences and yet exceed them in the span of wings is the provisional and mighty task of the disability arts, culture and public pedagogical movement.
Using arts-based research to understand the sociocultural facets of having invisible disabilities in a normative society
Authors: Allen Alexandra
Published: February 2020

Disability studies is centred around the idea that disability is a social construction. Within the field of disability studies, however, many people with non-apparent disabilities are still underrepresented when it comes to the investigation of how social factors influence the formation of their own disability identity. Throughout this study, I use arts-based research to explore moments of critical disability awareness that highlight instances in which sociocultural factors have influenced my disability identity. By examining certain facets of critical disability studies that address issues of ableism, I am able to emphasize the ways in which critical autobiography can contribute to the discourse of having invisible disabilities within a normative society.
Splashes of light: Parents of children with dyslexia explore experiences through visual arts
Authors: Watt Jennifer
Published: February 2020

This article examines the critical disability praxis grounding a research study that explored the lived experiences of parents of children with dyslexia through in-depth interviews and arts-based focus group. The participants engaged in visual arts practices to create provoking images of the issues facing themselves or their families. This multimodal experience became an opportunity for the participants to raise awareness of the needs of families with learning disabilities. This article focuses on two parent-artists who created visual pieces that shared a thematic focus on darkness and light. Both pieces contribute to a deeper understanding of the challenges and difficulties that these parent-artists encountered, but also gave them the opportunity to voice the more affirmative and empowering aspects of their experiences.
Insania quae medicis traditur
Authors: Bán Katalin
Published: February 2020

In my study, I intend to examine and compare Seneca’s and Aretaeus’s views about madness of physical origins, as we can observe several connection points of this mental state in their medical and philosophical treatises. Seneca distinguishes between two types of insania, and as a philosopher, puts more emphasis on the “usual madness” of those who are in the grip of passions, but also deals with the madness of those who are medically ill and treated by medical doctors (insania publica et quae medicis traditur). Aretaeus as a physician approaches the phenomenon mainly from a medical point of view, but beyond biological causes, also pays attention to the manifestation of mental disorders due to emotions, that is, he expresses that purely passions and emotions are able to cause mental disorder. We can observe that both of them expresses a specific blend of these two types of insania, which shows how much contemporary philosophy and medicine were intertwined in spite of their separation.
DYNAMIC ANALYSIS OF OFFSHORE PILES EMBEDDED IN ELASTOPLASTIC SOFT CLAY
Authors: Mohamad Ali Anis , Essa Mohamad J. K. , Hassan Abdulameer Qasim
Published: February 2020

This work deals with the dynamic behavior of offshore piles embedded in soft clay, and an attempt is made to estimate the critical embedded pile length. ABAQUS finite element program is used to simulate the problem. The soil was modeled as an elastic state and elastoplastic state and represented by cam-clay model. Three dimensional elements were used to represent the interaction between pile and soil, laboratory tests are used to obtain the real properties of soil and to describe interface. The results obtained are used to develop the elastic equation used by Matlock and Reese to calculate the critical embedded pile length for pile embedded in elastoplastic soil. Also, show that the critical embedded pile length is increased by about (20 % to 40 %) due to changing soil model from elastic to elastoplastic. The pile embedded in an elastoplastic soil is dependent on soil strength, interface properties and pile rigidity. The pile head displacement is increased about 90 % while the bending moment is deceased by 10 % at pile head.
INFLUENCE OF BASEBOARD HEIGHT ON RESISTANCE TO WIND FORCE OF SCAFFOLDS AT WINDWARD SIDE OF BUILDINGS
Authors: Takahashi Hiroki , Aoki Mizuki , Ohdo Katsutoshi , Ohgaki Kazuo
Published: February 2020

The Japanese Industrial Safety and Health Law was revised in March 2009 to introduce new measures by which to prevent accidental falls in the construction industry. As part of this revision, regulations on the installation of guard rails, toe boards, mesh sheets, and other components in appropriate positions on scaffolds were established. When scaffolds are installed in construction sites, their resistance against wind force needs to be calculated. Japanese design guidelines stipulate a specific scaffold resistance against wind force, but such regulations are applicable to conventional scaffolds. The problem with outdated regulations is that scaffolds are used during building construction without practitioners knowing whether the existing guidelines are suitable for new-style scaffolds. Accordingly, this study was conducted a wind tunnel test to examine the wind force exerted on building scaffolds, with the parameters being baseboard height and distance between scaffolds and a building. The relationship between the wind force coefficient of the scaffolds and baseboard height was proportional only on the scaffolds. As the distance between the scaffolds and the building lengthened, however, the relationship between the parameters reflected a steeper curve as baseboard height increased. Whenever the scaffolds were set near the building, negative pressure acted on the scaffolds as a consequence of the downwind structure. This study was examined the correction factor of the wind force coefficient of the scaffolds.
ANALYSIS OF ECONOMIC DETERMINANTS OF AFFORDABLE HOUSING PRICES
Authors: Olanrewaju Abdullateef , Tat Lee Lim , Tan Seong Yeow , Naoto Mine , Nizamani Zafarullah , Abdul Aziz Abdul Rashid
Published: February 2020

There is high possibility that the housing shortage in Malaysia will remain for a long time. However, while the existing housing stock is insufficient, constraints on income distributions have created affordability gaps by creating an imbalance between demand and supply. To increase housing supply, the government is providing homes directly as well as providing tax reliefs and subsidies to the developers, contractors and prospective home buyers. However, despite the measures the housing supply and distribution gaps are growing persistently. Therefore, there is the need to provide answers to a number of questions. It is the aim of this current study to examine the economic determinants of affordable housing. Through a cross sectional survey questionnaire, involving 71 homeowners, 13 cost determinants were established for affordable housing. The study provides insight into cost determinants of affordable housing. The results will be useful to policy makers, developers towards and the prospective home buyers.
SEISMIC DAMAGE PREDICTION OF OLD JAPANESE-STYLE WOODEN HOUSE USING PREDOMINANT PERIOD DISTRIBUTION OF GROUND SURFACE LAYER
Authors: Takatani Tomiya , Nishikawa Hayato
Published: February 2020

In general, the evaluation of a site amplification effect is very important in earthquake engineering when a seismic damage to wooden house with a low seismic performance against a strong earthquake will be predicted by an accurate estimation of the seismic intensity at surface ground. In this paper, both horizontal and vertical microtremors at 51 measuring sites in the west district in Maizuru city were measured by servo type accelerometers, and also the predominant periods at 727 sites in the same area were numerically estimated from the predominant periods measured at 51 sites using the Inverse Distance Weighting method. Moreover, a seismic damage prediction of wooden house against a strong earthquake ground motion was conducted by a relationship between a seismic damage function and a maximum drift angle of wooden house.
STUDY ON RETROFIT EFFECTS FOR HORIZONTAL PLANE OF TRADITIONAL WOODEN HOUSES BASED ON FULL-SCALE TEST
Authors: Miyamoto Mitsuhiro , Okuhiro Haruka
Published: February 2020

In the present study, few studies have focused on the horizontal plane of traditional wooden houses in Japan. This study aims to examine the retrofit effects for the horizontal plane of traditional wooden houses based on full-scale tests. The first part of this paper is devoted to the experimental study performed to determine the structural behavior and characteristics of full-scale roof specimens. A horizontal shear test was conducted to obtain the fracture mode and relationship between the applied load and deformation angle. The second part deals with a static pushover analysis of the full-scale roof specimens. The results between the experimental test and the static pushover analysis are presented and discussed. The analysis model used for the static pushover analysis is proposed; the results were in good agreement with the tests.
VIBRATION PROPERTIES OF TRADITIONAL MASONRY WALLS OF CORTES CHURCH
Authors: Takiyama Noriko , Yamaguchi Akari , Hara Kohei , Ramon Jimenez Verdejo Juan
Published: February 2020

The Santo Niño Church in Bohol Island was partially damaged in the Bohol Earthquake in October 2013. In this study, we investigated the structural property of the Santo Niño Church to understand the vibration characteristics of Philippine masonry constructions by checking the main damage and conducting measurement surveys and microtremor measurement on the structure and ground. The major findings of this study can be summarized as follows: (a) Collapsed walls, peeling wall stone, corner deformation, and collapsed ceiling were the main damages that were observed. The collapsed wall was measured, and the make-up and material thickness of the wall was verified. (b) By performing microtremor measurements on the walls, the vibration property of the church, such as the natural frequency and vibration mode of the longest wall A was clarified. The 1st natural frequency of the longest wall A is the lowest.