bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of an intelligent family physician-optimised coordination model program on hypertension management in a Beijing community
Authors: Li Dan , Wei Xuejuan , Wu Hao , Liu Xinying , Ge Caiying , Gao Wenjuan
Published: June 2020

The prevalence of hypertension in China is increasing. To control chronic diseases, the Beijing Municipal Government implemented an intelligent family physician-optimised collaborative model (IFOCM). The present retrospective study assessed the effectiveness of the IFOCM in the management of hypertensive patients at the Fangzhuang Community Health Service Centre, Beijing. Using deidentified data from hypertensive patients, blood pressure (BP), BP control rate, 10-year risks of ASCVD, lifestyle changes and blood lipid levels were compared before and after implementation of the IFOCM. In all, 7332 patients with hypertension were included in the study. Systolic BP decreased from 144.59 to 142.96mmHg after program implementation (P<0.001), and the overall BP control rate increased from 41.43% to 46.49% (P<0.001). The proportion of patients predicted to be at a high 10-year risk of developing atherosclerotic cardiovascular disease decreased from 77.27% to 64.61% (P<0.001). After program implementation, body mass index decreased (from 24.87 to 24.36kg/m2; P<0.001), exercise frequency and intensity increased and salt intake, cigarette smoking, total cholesterol and low-density lipoprotein cholesterol all decreased significantly (P<0.001). The IFOCM program is effective in managing hypertension and providing timely patient care.
Effects of glucuronic acid and N-acetyl-D-glucosamine supplementation on the perivitelline space during the IVM of pig oocytes
Authors: Current J. Z. , Whitaker B. D.
Published: June 2020

The objective of this study was to minimise polyspermic penetration by increasing the perivitelline space (PVS) thickness through supplementation of the hyaluronic acid components glucuronic acid and N-acetyl-d-glucosamine (GlcNAc). Oocytes (n=4690) were supplemented during the first 24h and/or the remainder of maturation (final 16–18h) with 0.01mM glucuronic acid and 0.01mM GlcNAc and then evaluated for PVS thickness, hyaluronic acid, glutathione and glutathione peroxidase concentrations. Fertilised oocytes were evaluated for polyspermic penetration and embryo development. The PVS thickness and amount of hyaluronic acid was significantly (P<0.05) greater in oocytes supplemented with 0.01mM glucuronic acid and 0.01mM GlcNAc during the second part or all of maturation compared with the other treatments. In addition, polyspermic penetration was significantly (P<0.05) less in oocytes supplemented with 0.01mM glucuronic acid and 0.01mM GlcNAc during the second part or all of maturation compared with the other treatments. Supplementing 0.01mM glucuronic acid and GlcNAc during maturation significantly (P<0.05) increased the percentage of cleaved embryos by 48h after IVF and blastocysts formed by 144h after IVF compared those not supplemented. These results indicate that supplementing PVS components during maturation decreases polyspermic penetration by increasing PVS thickness.
Radiocarbon-based approach capable of subannual precision resolves the origins of the site of Por-Bajin
Authors: Kuitems Margot , Panin Andrei , Scifo Andrea , Arzhantseva Irina , Kononov Yury , Doeve Petra , Neocleous Andreas , Dee Michael
Published: June 2020

Significance

The problem with radiocarbon dating is that its resolution is only centennial or, at the very best, decadal. Thus, the method is incapable of resolving many historical problems. Here, we use recent developments in atmospheric science to date the construction of a renowned archaeological site to the exact year, in fact, to the exact season. Such precision opens up new possibilities for the broader study of human history. Achieving dates on an annual scale will offer the potential for new assessments to be made of considerable archaeological significance.
Emergence of scale-free smectic rivers and critical depinning in emulsions driven through disorder
Authors: Le Blay Marine , Adda-Bedia Mokhtar , Bartolo Denis
Published: June 2020

During the past 60 min, oil companies have extracted 6 trillion liters of oil from the ground, thereby giving a striking illustration of the impact of multiphase flows on the world economy. From a fundamental perspective, we largely understand the dynamics of interfaces separating immiscible fluids driven through heterogeneous environments. In stark contrast, the basic mechanisms ruling the transport of fragmented fluids, such as foams and emulsions, remain elusive with studies mostly limited to isolated droplets and bubbles. Here, we demonstrate that the mobilization of emulsion driven through model disordered media is a critical plastic depinning transition. To elucidate this collective dynamics, we track the trajectories of hundreds of thousands of microfluidic droplets advected through random lattices of pinning sites. Their dynamics reveals that macroscopic mobilization only requires the coordinated motion of small groups of particles and does not involve any large-scale avalanches. Criticality arises from the interplay between contact and hydrodynamic interaction, which channel seemingly erratic depinning events along smectic river networks correlated over system spanning scales. Beyond the specifics of emulsion transport, we close our article discussing the similarities and profound differences with the plastic depinning transitions of driven flux lines in high-
T
c
superconductors, charged colloids, and grain transport in eroded sand beds.
Unveiling defect-mediated carrier dynamics in monolayer semiconductors by spatiotemporal microwave imaging
Authors: Chu Zhaodong , Wang Chun-Yuan , Quan Jiamin , Zhang Chenhui , Lei Chao , Han Ali , Ma Xuejian , Tang Hao-Ling , Abeysinghe Dishan , Staab Matthew , Zhang Xixiang , MacDonald Allan H. , Tung Vincent , Li Xiaoqin , Shih Chih-Kang , Lai Keji
Published: June 2020

Significance

Defects in two-dimensional (2D) transition-metal dichalcogenides play a crucial role in controlling the spatiotemporal dynamics of photogenerated charge carriers, which remain poorly understood to date. In this paper, the defect-mediated carrier diffusion and recombination in WS
2
monolayers are quantitatively investigated by laser-illuminated microwave impedance microscopy. Surprisingly, the photoresponse is in general stronger in the more disordered regions and samples. Such counterintuitive observations are reconciled by spatiotemporally resolved experiments, which indicate that the electron lifetime is prolonged due to the slow release of holes from the trap states. The results reveal the intrinsic time and length scales of photocarriers in van der Waals materials, providing the guidance for implementing nanooptoelectronic devices based on 2D semiconductors.
Extraction of the CKM phase γ from the charmless two-body B meson decays *
Authors: Zhou Si-Hong , Lü Cai-Dian
Published: June 2020

Using all experimentally measured charmless

,

decay modes, where

denotes a light pseudoscalar (vector) meson, we extract the CKM angle

by a global fit. All hadronic parameters are determined from the experimental data, such that the approach is least model dependent. The contributions of the various decay modes are classified by the topological weak Feynman diagram amplitudes, which are determined by the global fit. To improve the precision of the approach, we consider the flavor SU(3) breaking effects of the topological diagram amplitudes of the decay modes by including the form factors and decay constants. The fit result for the CKM angle

is

. It is consistent with the current world average values but has a smaller uncertainty.
PandaX limits on the light dark matter with a light mediator in the singlet extension of MSSM *
Authors: Wang Wenyu , Wu Jia-Jun , Xiong Zhao-Hua , Zhao Jun
Published: June 2020

Using the latest PandaX limits on the light dark matter (DM) with a light mediator, we check their implication on the parameter space of the general singlet extension of MSSM (without Z
3 symmetry), which can have a sufficient DM self-interaction to solve the small-scale structure problem. We find that the PandaX limits can tightly constrain the parameter space, depending on the coupling λ between the singlet and doublet Higgs fields. For the singlet extension of MSSM with Z
3 symmetry, the so-called NMSSM, we also demonstrate the PandaX constraints on its parameter space, which gives a light DM with the correct relic density but without sufficient self-interaction to solve the small-scale structure problem. We find that in NMSSM, the GeV dark matter with a sub-GeV mediator is tightly constrained.
Connecting muon anomalous magnetic moment and multi-lepton anomalies at LHC
Authors: Sabatta Danielle , Cornell Alan S. , Goyal Ashok , Kumar Mukesh , Mellado Bruce , Ruan Xifeng
Published: June 2020

In a previous paper by several of the authors a number of predictions were made in a study pertaining to the anomalous production of multiple leptons at the Large Hadron Collider (LHC). Discrepancies in multi-lepton final states have become statistically compelling with the available Run 2 data. These could be connected with a heavy boson, H, which predominantly decays into a standard model Higgs boson, h, and a singlet scalar, S, where

GeV and

GeV. These can then be embedded into a scenario where a two-Higgs-doublet is considered with an additional singlet scalar, 2HDM+S. The long-standing discrepancy in the muon anomalous magnetic moment,

, is interpreted in the context of the 2HDM+S type-II and type-X, along with additional fermionic degrees of freedom. The 2HDM+S model alone, with constraints from the LHC data, does not seem to explain the

anomaly. However, adding fermions with mass of order

GeV can explain the discrepancy for sufficiently low values of fermion-scalar couplings.
Axialvector tetraquark candidates for Zc(3900), Zc(4020), Zc(4430), and Zc(4600) *
Authors: Wang Zhi-Gang
Published: June 2020

We construct the axialvector and tensor current operators to systematically investigate the ground and first radially excited tetraquark states with quantum numbers

using the QCD sum rules. We observe one axialvector tetraquark candidate for

and

, two axialvector tetraquark candidates for the

, and three axialvector tetraquark candidates for

.
Key factor for determining relation between radius and tidal deformability of neutron stars: Slope of symmetry energy *
Authors: Zhang Nai-Bo , Qi Bin , Wang Shou-Yu
Published: June 2020

The constraints on tidal deformability

of neutron stars were first extracted from GW170817 by LIGO and Virgo Collaborations. However, the relationship between the radius

and tidal deformability

is still under debate. Using an isospin-dependent parameterized equation of state (EOS), we study the relation between

and

and its dependence on parameters of symmetry energy

and EOS of symmetric nuclear matter

when the mass is fixed at

,

, and

. We find that, although the changes of high order parameters of

and

can shift individual values of

and

, the

relation remains approximately at the same fitted curve. The slope

of the symmetry energy plays the dominant role in determining the

relation. By investigating the mass dependence of the

relation, we find that the well fitted

relation for 1.4

is broken for massive neutron stars.
Classifying cosmic-ray proton and light groups in LHAASO-KM2A experiment with graph neural network *
Authors: Jin Chao , Chen Song-zhan , He Hui-hai , Collaboration) (for the LHAASO
Published: June 2020

The precise measurement of cosmic-ray (CR) knees of different primaries is essential to reveal CR acceleration and propagation mechanisms, as well as to explore new physics. However, the classification of CR components is a difficult task, especially for groups with similar atomic numbers. Given that deep learning achieved remarkable breakthroughs in numerous fields, we seek to leverage this technology to improve the classification performance of the CR Proton and Light groups in the LHAASO-KM2A experiment. In this study, we propose a fused graph neural network model for KM2A arrays, where the activated detectors are structured into graphs. We find that the signal and background are effectively discriminated in this model, and its performance outperforms both the traditional physics-based method and the convolutional neural network (CNN)-based model across the entire energy range.
Accretion on high derivative asymptotically safe black holes *
Authors: Farooq M. Umar , Ahmed Ayyesha K. , Yang Rong-Jia , Jamil Mubasher
Published: June 2020

Asymptotically safe gravity is an effective approach to quantum gravity. It is important to differentiate modified gravity, which is inspired by asymptotically safe gravity. In this study, we examine particle dynamics near the improved version of a Schwarzschild black hole. We assume that in the context of an asymptotically safe gravity scenario, the ambient matter surrounding the black hole is of isothermal nature, and we investigate the spherical accretion of matter by deriving solutions at critical points. The analysis of various values of the state parameter for isothermal test fluids, viz., k = 1, 1/2, 1/3, 1/4 show the possibility of accretion onto an asymptotically safe black hole. We formulate the accretion problem as Hamiltonian dynamical system and explain its phase flow in detail, which reveals interesting results in the asymptotically safe gravity theory.
Cosmological scenario based on particle creation and holographic equipartition *
Authors: Tu Fei-Quan , Chen Yi-Xin , Huang Qi-Hong
Published: June 2020

We propose a cosmological scenario that describes the evolution of the universe based on particle creation and holographic equipartition. The model attempts to solve the inflation of the early universe and the accelerated expansion of the present universe without introducing the dark energy from the thermodynamical perspective. Throughout the evolution of the universe, we assume that the universe consistently creates particles, and that the holographic equipartition is always satisfied. Further, we set the creation rate of particles proportional to

in the early universe and to H in the present and late universe, where H depicts the Hubble parameter. Consequently, we obtain the solutions

and

for the early universe and solutions

and

for the present and late universe, respectively, where

and

are the parameters. Finally, we obtain and analyze two important thermodynamic properties for the present model.
Increasing the solar cell efficiency using glass balls
Authors: Issa Naji Ammar , Abdulhussein Hafedh Khalid , Idan Fadheel Kreem
Published: June 2020

Solar cells lose high percent of their capacity as a result of insufficient solar radiation, due to changing of the solar angle of projection during the day. Thus this research aims to increase the cell efficiency by a novel method which is based on collecting rays in the convex focus and dispersed in the concave lens, to make the rays always perpendicular on cells. To achieve this purpose, glass balls with a diameter of 10 mm were used and arranged on the cell area. This work found an obvious increasing in the cell efficiency, where it is possible to have an increasing in generating voltage by an estimated 7.53%, and the current 1.086% by this novel method.
Quality of stingless bee honey based on volatile organic compounds and gas released
Authors: Nur Ain Mohammed Hassan Khairiah , Kamarulzaman Raja Ibrahim Raja , Hani Jameela Sapingi Husni , Afiq Daniel Azmi Muhammad , Zakaria Zarita , Ihsan Nurashikin
Published: June 2020

The aim of this study is to investigate the volatile organic compound released by stingless bee honey stored at room temperature (≈24°C) for 10 days and how yeast can influence the stingless bee honey quality. A newly harvested stingless bee honey is divided into 8 samples with each containing 100 ml. Each sample is filled into a glass bottle and 8 samples are considered for 8 different days of evaluation. Gas produced by the samples are collected and analyzed using FTIR coupled with White Gas Cell. The spectrum analysis is done by comparing the spectrum of volatile compound with the infrared fingerprint spectral characteristics from Infrared Analysis Inc. database library via Perkin Elmer’s spectrum software. Ethanol, methanol, methane, carbon dioxide, water vapour, and ethyl acetate were found to be released by the stingless honey samples. The bands area were identified in order to calculate the concentration of volatile compounds in the honey’s gas. The trend of each of the volatile gasses can be seen from Day-1 until Day-8 of evaluation. To study the presence of yeast, 10 g of stingless bee honey is incubated overnight in nutrient broth followed by centrifuging 1.5 ml of the culture broth repeatedly to obtain cell pellet for VPSEM analysis. VPSEM results indicated that morphology of yeast found in the honey sample. Ethanol concentration found to decrease by time however detailed analysis revealed that sample with the presence of yeast shows an increase of ethanol deliberated by the stingless bee honey. This result affirmed that the presence of yeast may facilitate the further alcoholic fermentation in stingless bee honey by which affecting the sensory value of the stingless bee honey.
Structure and Percolation Thresholds in Magnesia Stabilized ZrO2-MgO Porous Composite
Authors: Buyakov Ales , Kulkov Sergei
Published: June 2020

This work reports the influence of porous ZrO2-MgO ceramic composition on its structure and mechanical properties. The bimodal pore structure were formed by introduction of organic pore forming particles into the initial powder composition and due to the voids between ceramic powder particles. It was shown, that the mechanical parameters of the porous ZrO2-MgO composite are substantially defined by the value of the microstresses, the MgO content, and, apparently, the formation of a percolation structure. Thus, it was shown that by varying the composition and the size of the pore-forming particles, it is possible to achieve a high degree of identity with the structure and properties of natural bone tissue.
Molar mass determination of polylactic acid alternatives by capillary viscometry method
Authors: Horváth T , Szabó T J , Marossy K
Published: June 2020

The molar mass of polymers is a basic property that defines the appropriate processing method and the field of application of polymers. Therefore, the measurement of molar weights is a crucial point of polymer synthesis. In absence of modern but expensive equipment a rheology-based method can be used to define the molar mass with reliable result. By evaluation of molar mass, the entire polymerization can be monitored and controlled.

During my experiments polylactic acid alternatives (PLLA, PDLA, PDLLA) have been synthesized by direct polycondensation methods. According to the relevant literature, by this method and with the adequate setup of its parameters 104-105 g·mol−1 molar mass can be reached. The two most important parameters are the process time and temperature that strongly effects on the value of molar mass of polymer. In this work standard polycondensation method has been used to produce the mentioned polylactic acid alternatives then the molar masses of polylactic acid polymers were calculated by followed the correlation of Mark – Houwink relation.
The Dependence of Actual Laser Cutting Speed on CNC Sheet Equipment on Number of NC Program Commands for Metal Grades 1.0114 and AWAIMg3
Authors: Petunin Alexander , Tavaeva Anastasia
Published: June 2020

One of the complex optimization problems arising in technical applications is the cutting path problem for CNC sheet metal cutting machines. This problem is to optimize the tool path for the CNC technological equipment when cutting a fixed set of parts allocated on sheet metal. The time of cutting process is one of objective functions for the optimization problem. This objective function depends on six parameters of cutting process: 1) cutting speed; 2) lengths of the cutting tool path; 3) speed of idling motion of tool; 4) length of idling motion; 5) number of piercings; 6) time of one piercing. When programming NC program, speed of cutting is defined by the user of the CAM (Computer-Aided-Manufacturing) system and considered as a constant. However, this is actually not the case. Consequently, the problem of exact calculation of objective function is arisen. In order to solve this problem, the correction coefficients for the cutting speed value defined by the user must been calculated. Obviously, these coefficients will vary for different thicknesses and grades of metal. The paper presents the results of investigates, which made it possible to find the functional dependences of the cutting speed for the CNC laser cutting machine (CO2) on the number of NC program commands for the following metal grades: 1.0114 (thickness Δ = 1-10 mm) and AWAIMg3 (Δ = 1-5 mm).The statistical materials of experiments were processed by using software “Mathcad”. The received results show that the actual average value of cutting speed is monotonically decreasing function depended on number of NC program commands. In addition, the calculation of the actual cutting speed provides not only an accurate calculation of the value of the objective function, but also, as a result, the correct finding of the optimal tool path
Experimental study of the ultrasonic welding effects in the metal joint microstructure
Authors: Anna Kovács Tünde
Published: June 2020

In this article will present the technology parameters effects in the case of thin copper sheets joining with agree of the material science theory and metalworking rules-based executed experiments. Known the dislocation theory of the ultrasound energy influence in the case of the metalworking. The ultrasonic welding technology uses the ultrasound effect for increase the metal formability because the joint established by high-frequency vibration and pressing. The ultrasonic welding is a solid-state welding technology in which detectable the high-frequency vibration caused friction effected warming in the joint and the heat-affected zone. The established heat accompanied by plastic deformation can cause Changement in the joint microstructure as a function of the established heat, the heat transfer coefficient and the plastic deformation degree of the used metal. The relationship is founded between the experimented metal thin sheets welded joint mechanical properties, microstructure and the welding parameters. The joint mechanical and microstructural properties experimented by Vickers hardness test and visual inspections.
Mechanical Behavior of the Spine Segment
Authors: Rikun Yu A , Chaikovskaya (Kolmakova) T V , Kulkov S N
Published: June 2020

The article presents the model of intervertebral disc, that takes into account the presence of a nucleus pulposus and an annulus fibrous containing collagen fibers with direction at angles ±45º and ±30º. The influence of the percentage of layers of the annulus fibrous with different directions of collagen fibers on the stress-strain state of the intervertebral disc was investigated.
ZrC-TiC-MoSi2 ceramic composite by spark plasma sintering
Authors: Hussainova Irina , Minasyan Tatevik , Liu Le , Aydinyan Sofiya
Published: June 2020

ZrC-TiC-MoSi2 ceramic composite was consolidated by spark plasma sintering at 1850-1900°C temperature, for 5-10 min of dwell time under 50 MPa of applied pressure. The influence of MoSi2 addition on the mechanical performance and microstructure of ZrC-TiC composite was investigated. Compared with ZrC-TiC, the sinterability of ZrC-TiC-MoSi2 was improved, as the latter one achieved relatively fully dense bulk under the same sintering conditions. The hardness and fracture toughness of ZrC-TiC-MoSi2 composite were increased remarkably manifesting >99% of density, 29.8 GPa of Vicker’s hardness, and indentation fracture toughness of 8.01 MPa·m1/2. Under erosion and fracturing conditions, it was shown that solid solutions of (Zr,Ti)C serve an important role in erosion and crack propagation resistance.
Examination of mullite ceramic specimens made by conventional casting method from kaolin and sawdust
Authors: Kurovics E , Ibrahim J F M , Tihtih M , Udvardi B , Nuilek K , Gömze L A
Published: June 2020

Using relatively low-cost raw materials (conventional kaolin and sawdust powders) and simple technology, the authors have developed new ceramic composite materials which can successfully meet different industrial requirements. Casting masses (slurries) were made by mixing and milling different compositions of the powders with distilled water. The ceramic specimens were made by conventional gravitation slipcasting method, after drying of the green specimens, the samples were sintered in an electric kiln under oxidation and reduction atmosphere at 1250°C. The prepared and sintered specimens were tested based on geometrical sizes, microstructures and morphologies using scanning electron microscopy. In this work, the authors present some parts of the results of their research and investigation.
Rheological parameters of polymer-silicate gels
Authors: Mastalska-Popławska J , Izak P , Wójcik Ł , Góral Z , Stempkowska A
Published: June 2020

Hydrogels, due to their unique properties (they can absorb large amounts of solution, sometimes even several hundred times higher than their initial mass), have found application in many areas of life. Their polymerization rate depends for example on the pH, temperature, composition of the polymerization mixture, amount of the initiators, degree of cross-linking of the polymer and composition of the polymerization mixture.

The results of the kinetic reactions showed that the increased proportion of silicate in the sample causes faster gelation. It was also found that the lower the silicate modulus is, the polymerization reaction starts faster. However, oscillation tests carried out 24 hours after synthesis showed that better elastic properties (higher values of the elastic modulus G’) show samples with higher content of polymer in the composition.
Various influences on the formation of silica-encapsulated liposome particles and their functional cosmetic application
Authors: Ho Chang Jeong
Published: June 2020

This work reports the various influences on the formation of silica-encapsulated liposome particles such as the used concentration of silica precursor and lecithin, and reaction temperature, and used solvent, and demonstration of cosmetic application with natural hemp-seed extracts as an anti-oxidant material for controlled release formulation. The obtained SLPs from various conditions were characterized by SEM, particle size analyzer, and FT-IR spectrophotometer to confirm the morphology and particle size. Furthermore, the cosmetic formulation of SLPs was demonstrated with controlled release of natural hemp-seed extracts.
Thermoplastic corn starch reinforced with pine wood fibre and calcium carbonate precipitate filler
Authors: Gerezgiher A G , Tamási K , Ibrahim J F M , Kónya C , Szabó T
Published: June 2020

The shortage of oil and related minerals and also their extreme environmental drawbacks are the main reason for the quick-growing interest in biodegradable polymer composites production. Biodegradable polymer composites are mainly produced from renewable resources which are biologically degradable. In this research, corn starch was plasticized with glycerol. The plasticized thermoplastic corn starch was reinforced with calcium carbonate precipitate powder as a filler and pine wood fibre as reinforcement. Free thermoplastic plasticized corn starch (FTPS), thermoplastic corn starch reinforced with calcium carbonate (CTPS), thermoplastic corn starch reinforced with pine wood (WTPS), thermoplastic corn starch reinforced with pine wood fibre and calcium carbonate precipitate hybrid composite (HTPS) were produced and compared for their mechanical properties like tensile strength and, hardness. DSC and DMA analysis were also done for determining their thermal properties. Moreover, the water absorption test was also carried out to understand their resistance to moisture. WTPS exhibits better results in most of the measured proprieties given that TPS and wood fibre being both hydrophobic resulted in a homogeneous distribution and better interfacial adhesion.
The Potency of Purple Sulphur Bacteria for In-Situ Sulphide Bioremediation in Water
Authors: Sadi N H , Firmansyah F
Published: June 2020

Sulphide is odorous water pollutants and is also toxic in the form of H2S. Generally, water with high sulphide content has a very low amount of dissolved oxygen. Purple sulphur bacteria can be used as in-situ waters bioremediation agents to overcome sulphide pollution, one of which comes from the decomposition of organic compounds. This study aimed to determine the potency of purple sulphur bacteria isolated from various water located in the Cibinong area, Bogor Regency in West Java Indonesia to remove sulphides. The Pfennig 2 media was used for culturing the isolate. In order to get a single colony of bacteria, isolation was carried out using multilevel dilution method under anaerobic conditions. From this study, seven isolates of purple sulphur bacteria could be isolated. All isolates were able to remove sulphide from the test medium with 6% and 12% of sulphide. The highest sulphide removal ability was found in CU1 isolate followed by L1 and L2. The growth of CU1 and L2 in Kali Item River water could be detected within 17 hours. Thus, CU1 and L2 isolate had the potency to be used as an in-situ bioremediation agent for sulphides in waters with low oxygen content because of its anaerobic nature suitable for such environment.
Simultaneous Recovery of Ammonium and Phosphate from Leachate by Using Activated Zeolite
Authors: Suprihatin Suprihatin , Yani Mohamad , Fitriyani Ayu Laila
Published: June 2020

Ammonium and phosphate in leachate are potentially to contaminate both surface and groundwater. Zeolite has a high affinity so it can be used as an adsorbent for ammonium (NH4+), phosphate (PO43-) and other organic compounds. This research work aims to eliminate these pollutants stimulatingly by using activated zeolite. Leachate used for this experiment has initial ammonium concentration of 508.2 mg/L, and phosphate concentration of 7.77 mg/L. The zeolite has particle size of 100 mesh. Adsorption experiments were carried out with physically activated zeolite and physic-chemical activated zeolite with a dose variation of 15 - 120 g / L with a contact time of 12 hours. The results showed that a physical activated zeolite dosage of 120 g/L results in the smallest concentration of ammonium residue of 72.6 mg/L and a phosphate residue of 0.37 mg/L. The 45 g / L chemically-physically activated zeolite dose of 45 g/L produces an ammonium residue of 198 mg/L and phosphate residue of 0.74 mg/L. The ammonium adsorption with the both activated zeolites can be described very well using the 1st order kinetics model.
Effectiveness of Situ for Ciliwung Flood Mitigation in Bogor Regency
Authors: Nugraheni Claudia Tyas , Pawitan Hidayat , Purwanto Yanuar Jarwadi , Ridwansyah Iwan
Published: June 2020

Bogor Regency is one of Regencies in Jabodetabek area that is experiencing rapid urban growth. This condition impacted the decreasing conditions of 39’s from 95’s urban small lakes or locally known as ‘situ’. This research aims to analyze the effectiveness of situ Kebantenan and situ Cikaret as Ciliwung flood mitigation measure in the Bogor Regency. The SWAT model was employed for quantification the water balance of situ and watershed management. The simulation results of the water balance analysis indicated that the monthly average of volume of Situ Kabantenan and Situ Cikaret (2008-2015) were 136,955 m3 and 508,907 m3, the annual inflow Situ Cikaret were 24,693,822 m3/year and outflow were 25,177,593 m3/year, precipitation were 648,520 m3/year, evaporation were 166,543 m3/year, delta storage (1,794) m3/year, respectively. The result of hydrological responses analysis on application of situ and watershed management scenarios that combined the structural and non-structural measures was the best scenario for decreasing maximum discharge at situ outlet which is decreased 41% discharge. So that, in order to enhance the effectiveness of situs for Ciliwung flood mitigation, the combination of the structural and non structural management of 13 situ’s in Ciliwung river basin within the Bogor Regency is recommended that can increase the storage capacity from 1.8 million m3 to 4.7 million m3.
Implementation of Smart Water Grid System as a Green Technology n Gedebage Sports Centre, Bandung City, Indonesia
Authors: Devitama F F , Xinjie L , Luziani S , Paramita B
Published: June 2020

Smart Water Grid system has been widely applied to the Master Plan water distribution system in developed countries, such as Japan, and Singapore. However, this system has not been widely applied to the Master Plan designs in Indonesia. This system has advantages in a more controlled distribution system to minimize the risk of damage to the water distribution system. Specifically, this system is capable of meeting water needs in multi-, because it uses various water sources in its application. The purpose of this article in general: to provide a precedent for review on the application of Smart Water Grid in the form of study precedents from Japan and Singapore; Explaining Smart Water Grid and its components that are applied, reviewing monitoring methods, discussing the advantages, and disadvantages. In the end, this precedent study will be a recommendation for water treatment planning applications in the design of the Gedebage Sports Centre. Smart Water Grid design parameters such as (1) Able to fulfil the water needs in the multi-source (2) Able to prevent further damage of distribution system (3) facilitate maintenance of the water distribution system. Then, it can overcome to meet water needs by using a green technology system. Scope of this research is implementing the system of Smart Water Grid in Master Plan area as a smaller area than city’s area.
Utilization of Bio-sand Filter Technology to Reduce The Hardness of Groundwater in Bangunjiwo Village, Yogyakarta
Authors: Widodo C , Worokinkkin S P D A , Aridito M N , Nurusman H A , Widyawidura W
Published: June 2020

Water is the most critical requirement for the community for daily needs. Groundwater in Bangunjiwo Village, Yogyakarta has a high level of hardness. groundwater in the village contains high Magnesium (Mg2+) and Calcium (Ca2+) reaches more than 180 ppm. The purpose of this study is to reduce the level of hardness of water in Bagunjiwo Village using bio-sand-filter technology. The sampling of groundwater in Bangunjiwo Village is done randomly at several different points. Water filtration with bio-sand-filter technology uses sand media by growing biofilm layers. Biofilm layers made from layers include gravel with a diameter of 2 cm, small gravel with a diameter of 1 cm, zeolites with a diameter of 0.5 cm, and layers of clay. Each layer is bordered by gauze. The arrangement is soaked in water for 21 days, resulting in biofilms in the media. The results of screening with bio-sand-filter technology showed a decrease in hardness of groundwater reached 78.67 % with a discharge of 0.5 litres per minute. Bio-sand-filters can absorb the content of Magnesium and Calcium even pathogens in the water. Bio-sand-filter technology is expected to be able to overcome community problems in Bangunjiwo Village, Yogyakarta.
Land Degradation Identification to Rehabilitate Upper Citarum Sub Watershed for Increasing Water Supply
Authors: Savitri Endang , Pramono Irfan B.
Published: June 2020

Land degradation in Upper Citarum gives problem not only for erosion and sedimentation in downstream, but also for decreases the infiltration due to higher surface runoff. The surface runoff from upper Citarum contributed to the flooding downstream, such as Bandung city and West Bandung District. The degraded areas could be determined through analysis of land vulnerability to erosion. The aim of this study is to identify areas vulnerable to erosion and to design a rehabilitation plan to reduce erosion and increase infiltration. It is expected that by doing the land rehabilitation, the surface runoff is decreased and the groundwater is increased. The land vulnerability is identified by overlaying land cover, land system and precipitation. The result shows that more than 50% of the total areas of Upper Citarum are vulnerable to erosion, 26% are very vulnerable and the rest are moderate to not vulnerable. The recommended activities for land rehabilitation in the vulnerable and very vulnerable areas are determined according to their functions: forest and non-forest. In the non-forest function, the suggested activities are infiltration well, ponds, and planting forest trees; while in the forest function, especially in the protected forest, enrichment planting completed with water trap.
Drought Frequency, Severity, and Duration Monitoring Based on Climate Change in Southern and Southeastern Ethiopia
Authors: Abara Magarsa , Komariah  , Budiastuti Sri
Published: June 2020

Ethiopia is highly vulnerable to the impact of climate change due to its low adaptive capacity and a higher dependence on rain-fed agriculture for livelihood. The aim of this paper was to identify the long-term climatic trends and the magnitude of those trends and to analyse drought duration, frequency, and severity in southern and south-eastern Ethiopia based on climatic data (1980-2017). This research is a quantitative research method. The southern and south-eastern of Ethiopia were purposely selected based on a frequent occurrence of drought in the country. Monthly data were obtained from National Meteorological Agency (NMA) of Ethiopia. Mann-Kendall (MK) Test coupled with Sen’s Slope Estimator was used to analyse the trend of climatic data and its magnitude, and Standardized Precipitation Evapotranspiration Index (SPEI) was used to analysis drought characteristics. SPEI of 1-, 3- and 6-month timescales were calculated to understand drought characteristics. The result of the MK test showed that annual rainfall trend had non-significant decrease at all station except at Gode. The trend of annual maximum and minimum temperature is insignificantly increasing. The calculated SPEI revealed drought is more frequent and severe from time to time in the study area. Results showed that the most frequent, severe and prolonged droughts occurred during1999-2017 compared to 1980-1999. Climate change mitigation and proactive drought management approach is highly recommended in order to minimize the risk of drought.
Phytoplankton and Water Quality of Three Small Lakes in Cibinong, West Java, Indonesia
Authors: Sulastri  , Akhdiana  , Khaerunissa N
Published: June 2020

In West Java small lakes, known as “Situ”, have many functions including flood control, irrigation, tourism, domestic water and fisheries. Lakes in urban area arevulnerable to anthropogenic impact and typically show elevated level of nitrate and phosphate which support eutrophication. Phytoplankton is sensitive to changes in aquatic ecosystems that arise from excessive eutrophication. This study is to determine the differences of phytoplankton composition and abundance and environmental factors three small lakes in Cibinong City. Two small lakes, Situ Cibuntu and Situ Lotus, receive water source which is coming from the streams flowing through agriculture and human settlement. The other lake, Situ Dora, receive water source coming from the ground water. Phytoplankton was collected weekly in July 2018, while the nutrient (TN and TP) and water quality including temperature, pH, DO, conductivity and TDS were monitored from July to December 2018. There was different phytoplankton composition and abundance and water quality between situ receiving water which flow through agriculture and settlement and groundwater. Phytoplankton composition of Situ Cibuntu and Situ Lotus was dominated by the group of Chlorophyta and Bacillariophyta with the average of phytoplankton abundance were 50967 and 16700 cells. L−1and the chlorophyll-a concentration were 21.451 and 6.591 µg.L−1 respectively. Phytoplankton composition of Situ Dora was dominated by the group of Chlorophyta with the lowest of phytoplankton abundance and chlorophyll-awere5858 cell. L−1 and 4.072 µg.L−1 respectively. The highest nutrient and species number of phytoplankton was recorded in Lake Cibuntu. Water quality of Situ Dora was also characterized by the low value of pH, nutrient (TP and TN). It is highlighted that water source enter into the lake determine status of water quality and characteristic of phytoplankton in urban small lake.
Green open space of riverbanks in Bogor City as a potential location for development of urban agriculture
Authors: Ramandhani Keni , Budiarti Tati , Makalew Afra DN
Published: June 2020

Bogor City is one city that has a history as a green city. To meet food security, green cities are not only directed at planting trees or ornamental plants. However, currently the green city is more directed at the development of productive plants so that the people of Bogor City can use it in meeting food needs. One alternative to conversion of urban agricultural land is in the river area. One of the structures of the Green Open Space (GOS) in Bogor City is referred to as the GOS river bank. Riverbank GOS is one of the potential locations for the development of urban agriculture, so this study aims to identify potential locations on river banks for the development of urban agriculture. The method used in this study is GIS analysis. The analysis process is done by overlaying the hydrological map (river), GOS land use map, and land slope map, which then produces the riverbank GOS thematic map. This data analysis technique is followed by an initial inspection process to check the correct location of potential points. The results of this study indicate potential location points of riverbank GOS that can be used for the development of urban agriculture in Bogor City.
River Capacity for Sectoral Water Pollution Loads (Case Study: Cilamajang River) City of Tasikmalaya
Authors: Irawan P. , Prakoso W G. , Waspodo R. S.
Published: June 2020

The increasing population in the city of Tasikmalaya has an impact on increasing the pace of development in various sectors. population growth and changes in land use have resulted in current environmental conditions in a number of areas in the city of Tasikmalaya showing a decline in quality. This is due to the increased use of natural resources including the use of surface water sourced from river water. Cilamajang River is a Ciwulan sub-basin located in the city of Tasikmalaya. The area of the Cilamajang watershed reaches 29.53 km2. Simulation of discharge using 15-year FJ Mock series method data provide a minimum discharge of the Cilamajang River of 474.95 Liters/second. Simulation of discharge and loading of pollution in 2018 has exceeded water quality standards according to PP 82 of 2001, BOD parameters are 131.72 mg/L, the COD parameter is 1.41 mg/L and the TSS parameter is 91.41 mg/L. This condition must receive serious attention for the local government in managing the water environment.
Urban Water Governance Through the Watershed Spatial Institutional Approach
Authors: I’anah  , Kartodihardjo Hariadi , Purwanto Januar Jarwadi , Murtilaksono Kukuh
Published: June 2020

The Cisadane watershed in the upstream part of Bogor Regency is used as a source of raw water for PDAM Kota Bogor. Development in the Cisadane River Basin encourages the conversion of protected land and water absorption into built-up land. Government policies for resolving watershed area management have tended to be structurally resolved. The non-structural approach through the spatial institutional approach rarely makes attention. This study aims to analyze water management through an approach to watershed spatial planning and the pattern of coordination between inter-sectoral institutions related to the Regional Spatial Plan (RTRW) for sustainable water management. The study used a mixed method, first look problems about inconsistensy with policy spatial planning ang then descriptive qualitative approach through analyzing the role of the RTRW and coordinating inter-sectoral institutions. The findings of the study showed that the role of the RTRW had not been effective in ensuring the sustainability of water resources management. Local governments as leader power in determining policies have not been able to integrate inter-sectoral and inter-regional interests due to lack of coordination between related institutions. The use of water resources often does not see the production or water management system that is related to the RTRW, because of that the need for a coordination forum to bridge the interests of integrated water resources in spatial planning.
Role of destination smartness in shaping tourist satisfaction: A SEM based on technological attributes in Sri Lanka
Authors: Ranasinghe J P R C , Danthanarayana C P , Ranaweera R A A K , Idroos A A
Published: June 2020

The widespread sprout of mobile technology, specially the smartphone, has further transformed the tourism experience and empowered today’s travellers by bringing together information search, communication, entertainment, social networking and mobility-related functionalities to the fingertips of on-the-go travellers & it provide quick response & information widely dispersed. Smart tourism has become a modern trend in tourism industry. It is one of the critical researchable area to search the potentiality of Sri Lanka as a smart tourist destination. The main objective is to identify smart features and the degree of smartness of Sri Lanka as a tourist destination from the perspective of tourists. One thousand fifty two tourists from Anuradhapura, Polonnaruwa, Sigiriya, Kandy, Nuwaraeliya, Ella, Galle, Matara, Kaluthara and Colombo districts are selected to collect data through a structured questionnaire. To identify the destination smartness researcher has been conducted multiple mediator analysis. Also structural equation modelling (SEM) has conducted by using smartPLS software. Results revealed that both mediators have partial mediation impact between the relationship of smart tourism attributes and travel experience satisfaction. Thus, the results could encourage the formation of Smart Tourism Destinations. With technology being embedded within the destinations environment, it can enrich tourist experiences and enhance destinations competitiveness. Tourism planners and managers will benefit from a better understanding of the integral elements of smart tourism destinations and it will support their efforts in developing competitiveness for destinations of the country.
Strategy to improve the solid waste management of Barangay Matictic, Norzagaray, Bulacan
Authors: Paz V de , Domingo R , Roxas F M
Published: June 2020

Solid Waste generation in the Philippine continues to be a national problem, and it is still increasing as the country’s population grows. This study aims to recommend improvements in the Solid Waste Management program at the national level by implementing behavioral change initiatives and alternative disposal plans for solid waste starting with Barangay (Brgy.) Matictic in Norzagaray, Bulacan as a pilot test. The research focus is reducing waste at the source and implementing changes in the manner of mobilizing resources to minimize waste generation. Research methodology includes Focus Group Discussion, interviews, and research with both internal and external stakeholders to facilitate gathering of data. This study shows that improvements in Solid Waste Management can be accomplished by allocating sufficient funds and efforts into changing the behaviour of households. It is recommended further that funding for the usual solid waste management interventions such as landfill and recycling must be implemented only if waste generation is avoided via proper resource planning and if waste segregation is strictly implemented through incentive programs or awareness initiatives. While technology plays a great role in managing solid waste, reframing the problem will improve outcomes. The global issue of waste must be perceived and resolved as an adaptive challenge, and not just a technical problem.