bluuebunny/crossref_metadata_2025 huggingface dataset:
Determination of non-poison queue system of distribution in the public service sector (case study: Semarang city population and civil registry office)
Authors: Sugito  , Prahutama A , Ispriyanti D , Mustafid
Published: July 2021

The public service sector is a sector that is engaged to serve the interests of the community. To get to the public service sector that satisfies the public, there needs to be innovation in system renewal. Many factors need to be analyzed in the public service sector to create a satisfying service. One of the factors determining community satisfaction is the queuing system in the public service area. Queue analysis is an analytical method to measure the performance of a queuing system. The system measured in services includes the number of visitors entering the queue system and the time customers start serving. The queuing system follows the Poisson, Exponential, Normal, or General distribution. For general distribution can be studied into Non-Poisson distribution. In this study, an analysis of the queuing system at the Department of Population and Civil Registration in the city of Semarang included 8 counters. From the analysis results obtained, the general distribution determined is the Dagum and Log Normal distribution. While the size of the performance of the queuing system can be said to be good, because the waiting time for customers in the system is very less.
Analysis of geometric and weibull queuing model (case study: customer service and electronic ID card recording counters at Dispendukcapil of Semarang City)
Authors: Sugito  , Prahutama A , Mustafid  , Ispriyanti D , Dewi L N
Published: July 2021

Semarang is the Capital City of Central Java which has a large population. For 2019, the population has increased from the previous year so that it will cause a change in population identity data. Dispendukcapil of Semarang City is one of the executors of public administration services in Central Java whose task is to carry out affairs in the field of population and civil registration. However, the queue has become one of the problems that occur there because of the arrival of many customers at the same time and is random. So one way to reduce queuing is to apply queuing theory to the system. The queue theory was developed to determine the queuing model so that it can be used to calculate system performance. In measuring the performance of the system determined using Graphical User Interface (GUI) R. The queue model that has been obtained at Dispendukcapil counters in Semarang is customer service counter (Geometric/Weibull)/1):(GD//∞/∞) and electronic ID Card recording counter (Geometric/Weibull)/1):(GD//∞/∞).
The use of statistical transformation in six sigma analysis
Authors: Mustafid  , Yulvia I , Ispriyanti D , Sugito  , Hakim A R
Published: July 2021

The basic assumptions in six sigma analysis are use data assumptions from the quality characteristic variables in-control and normal distributed. The use of normal distribution assumptions aims to facilitate the computational and analytical processes. In fact, there are many observational data obtained from industry which are uncontrolled and not normally distributed. The aim of the research is to use exponentially weight moving average (EWMA) as statistical transformation to make data uncontrolled and not normally distributed into data in-control and normal distributed. This research uses a case study with empirical data Weibull distributed, and use the statistics of EWMA to the data can be transformed into in-control and normal distributed. Based on the results of the transformation from empirical data, the EWMA control chart were made to determine the data position of in-control and also measured six sigma values.
Analysis of relationship between mangrove ecology to fish cultivator in Kertomulyo, Pati
Authors: Putri A P , Susiloningtyas D , Handayani T
Published: July 2021

Kabupaten Pati is located at north coast of java which has abundant fishery potential. This potential is built by too many factors, and one of them is mangrove ecosystem. Mangrove ecosystem are complex and dynamic. The purposes of this study is to analyze the relationship of mangrove ecosystems on ecological between fish production by fish cultivator at Kertomulyo Pati. The research is located at Kertomulyo Village, Pati. This study uses a quantitative descriptive approach with questionnaire and interview, observation and documentations methods and the target is fisherman who lives near the mangrove ecosystem. The data needed by this research were devided into two sources, primary data and secondary data. Primary data includes the production from fish cultivator and their perception?? about mangrove, secondary data is image from Google Earth and Landsat 8 for vegetation which is needed to know the changes of mangrove’s thickness and growth. The next step is running the data using ArcGis. Then the result of this analysis can be associated with fish cultivator’s production. So, there will be results which is answering the purposes.
Fe (III) adsorption using Fe (III) ionic imprinted polymer from polyeugenoxy acetate crosslinked with ethylene glycol dimethacrylate (EGDMA)
Authors: Djunaidi M C , Aini A Q , Widodo D S , Lusiana R A , Suseno A
Published: July 2021

Ionic Imprinted Polymer (IIP) with polyeugenoxy acetate (PA) as the base polymer, EGDMA as the crosslinking agent, and AIBN as the initiator have been synthesized to adsorb Fe(III) metal ions. NIP (non-imprinted polymer) was used as a comparison for this study. The produced polymer was characterized using FTIR spectroscopy and SEM-EDX. Adsorption rate and capacity were examined through adsorption isotherm and kinetics studies for all adsorbents. The adsorption selectivity test was done with mixed-metal solutions of Zn(II), Cu(II), Cd(II), and Ag(I). The results of SEM analysis on IIP-PA show a more uniform and regular size than NIP-PA. Adsorption of Fe(III) in IIP-PA and NIP-PA follows pseudo-second-order kinetics, and the adsorption isotherm both follow the Langmuir theory. The adsorption capacity of Fe(III) metal ions in IIP-PA is 10.88 mg/g, and the adsorption capacity of NIP-PA is 7.94 mg/g. The mechanism of adsorption of Fe(III) metal ions in IIP-PA and NIP-PA was dominated by hydrogen bonds between the -COOH groups and Fe(III). In binary solutions, IIP-PA adsorption selectivity coefficient is higher than NIP-PA with the order of Fe(III)/Zn (II)>Fe(III)/Cu(II)>Fe(III)/Cd(II)>Fe(III)/Ag(I)
Solanum lycopersicum and Daucus carota: effective anticancer agents (a mini review)
Authors: Ademosun O T , Adebayo A H , Ajanaku K O
Published: July 2021

The high cost, scarce availability, and some extraneous side effects of some pharmaceuticals have diverted the majority’s mindset towards the use of nutraceuticals as both prophylactic and therapeutic alternatives. The cancer incidence in the low and middle-income countries has risen due to several factors, but notably, it has been due to poverty and the non-availability of screening centers. The non-toxic nature, high availability, and low cost of food-based nutraceuticals have been a significant advantage to its users. Solanum lycopersicum is well-known to possess excellent antioxidant, anti-inflammatory, and anticancer potential, and this has been attributed to its potent bioactive compound, lycopene. The presence of β-carotene in Daucus Carota has also contributed immensely to its antioxidant and anticancer properties. Nutraceuticals are considered suitable for anticancer drug development due to their pleiotropic actions on target sites with multiple effects. This short review has explored the dietary characteristics, bioactive components and mild anticancer effects of tomatoes and carrots.
The protection of fish gelatine and arabic gum as coating materials to the quality chlorophyll Caulerpa racemosa encapsulation
Authors: Dewi E N , Perdana N E , Purnamayati L
Published: July 2021

Chlorophyll from Caulerpa racemosa is a pigment that has the potential to be used as a natural coloring agent. However, chlorophyll is susceptible to high temperatures. Microencapsulation is a technology that can protect chlorophyll degradation. The purpose of this study was to determine the effect protection of fish gelatine and Arabic gum combination as a coating material to the quality of chlorophyll microencapsulation from C. racemosa. Five different combination formulations of coating materials composed by fish gelatine and Arabic gum at ratio (w/w) 0%:10% (A), 0.5%:9.5% (B), 1%:9% (C), 1.5%:8.5% (D), 2%:8% (E) were applied to chlorophyll microencapsulation process. The microcapsules quality were tested for yield, solubility, dissolved solids, bulk density, moisture content, chlorophyll levels, and a degree of lightness test. Other analyses such as FTIR, SEM and DSC confirmed availability of chloropyll in microcapsules. The result showed that the formulation of C (combination of fish gelatine and Arabic gum at ratio (w/w) 1%:9%) has a high solubility of 97.75% and low water content of 3.57%, encapsulation efficiency of 68.95%, the density of 0.427 g/cm3 and chlorophyll level of 18.46 mg/L. The presence of chlorophyll was indicated at wavelengths of 1583–1709, 2809–3012, and 3029–3639 nm−1.
Physicochemical characterization of kappa-iota carrageenan gel with papain enzyme
Authors: Fransiska D , Utomo B S B , Darmawan M , Gozali D , Iqbal M N
Published: July 2021

Carrageenan is a group of galactose polysaccharides extracted from seaweed and has the ability to form a thermo-reversible gel or a viscous solution when added to the salt solution widely utilized as gelling, thickener and stabilizers in various industries such as food, pharmaceuticals, cosmetics, printing, and textiles. Only two types of carrageenan can be used in the manufacture of hydrogels which are kappa and iota. Kappa-carrageenan is produced from the tropical seaweed Kappaphycus alvarezii and Eucheuma denticulatum is the main species producing iota-carrageenan. The aim of this research is to know the composition of kappa-carrageenan and iota-carrageenan mixture as gel base to produce the optimum physical properties and to know the physical properties of optimum formula with the addition of papain enzyme for 4 weeks storage. The determination of the optimum formula of mixed carrageenan kappa and iota gel with Simplex Lattice Design method. The physical properties of the optimum formula with the addition of papain enzyme during 4 weeks storage are viscosity, pH, dispersion, and sineresis of optimum formula were statistically verified using Anova Univariate method of experimental design of two factorial with 95% confidence level. The results showed that the optimal formula of mixed carrageenan kappa and iota respectively concentrations of 0.3%, 1% and the use of 0.8% papain enzyme.
The effectiveness of anode variations for electrocoagulation and its application for laundry wastewater treatment
Authors: Suhartana
Published: July 2021

Since Diponegoro University moved its campus to the Tembalang area, it has been full of issues of decreasing groundwater quality and aesthetic decline caused by laundry wastewater and washing and toilet wastewater which has growing rapidly along with the growth of boarding houses in the Tembalang area. This will have an impact on the health quality of the people who live in the Tembalang area. This study aims to reduce the content of dissolved organic matter in laundry wastewater and bath wash also bath, wash and toilet wastewater. The method chosen was the electrocoagulation method, using 2 different electrodes. The electrodes chosen are aluminum metal and ferrous metal (as anode) and carbon (as cathode). With the electrocoagulation method using aluminum electrodes (as anode) and carbon (as a cathode) the amount of organic material that could be removed was 60.1%. Meanwhile, with ferrous metal (as anode) and carbon (as cathode) the amount of organic material that can be removed is smaller, namely 52.2%. The addition of 100 ppm NaCl solution and 100 ppm Na2SO4solution was able to increase the efficiency of organic matter removal by 1.8-2.5%.
Synthesis of sulfonated poly-(eugenol divinylbenzene) nanosilver composite and its application as antibacterial compound of cotton fabric
Authors: Prasetya N B A , Asiyah A , Sarjono P R , Ngadiwiyana N , Ismiyarto I
Published: July 2021

In recent years, nano-sized composite particles have been developed as antibacterial agents. We investigated antimicrobial activities of sulfonated poly-(eugenol divinylbenzene) nanosilver composite coated on cotton fabric. Firstly, sulfonated poly-(eugenol divinylbenzene) was synthesized through a cationic copolymerization between eugenol and divinylbenzene, followed by sulfonation using sulfuric acid. Furthermore, the nanosilver material was synthesized by reducing silver nitrate using sodium citrate solution as a reducing agent. The composite formation has been successfully carried out through the interaction of the polymer and nanosilver. The resulting inhibition zone diameter of copolymers and composites shows moderate inhibitory activity. The data shown by SEM-EDX reveals that the spray coating method is successful in making the composites coated well on cotton fabrics. Coated cotton fabric has hydrophobic properties and exhibits good antibacterial activity against E. coli and S. aureus bacteria.
The Cosmological Decrease of Galactic Density and the Induced Retarded Gravity Effect on Rotation Curves
Authors: Yahalom Asher
Published: July 2021

Galaxies are huge physical systems having dimensions of many tens of thousands of light years. Thus any change at the galactic center will be noticed at the rim only tens of thousands of years later. Those retardation effects seems to be neglected in present day galactic modelling used to calculate rotational velocities of matter in the rims of the galaxy and surrounding gas. The significant differences between the predictions of Newtonian instantaneous action at a distance and observed velocities are usually explained by either assuming dark matter or by modifying the laws of gravity (MOND). In this paper we will show that taking general relativity seriously without neglecting retardation effects one can explain the radial velocities of galactic matter without postulating dark matter. However, this will rely on a temporal change of galactic mass. We will compare two different mechanisms of density change, one is local, that is accretion of matter from the intergalactic medium. The other is global, that is the cosmological decrease of density due to the cosmic expansion. It will be shown that local effects are much more important in this respect.
Revisiting two well studied galaxy samples using alternative gravity
Authors: O’Brien James G. , Chiarelli Thomas L. , Kerin William M. , Belanger Jon
Published: July 2021

In the last few years, alternative gravity theories have seen increased interest due to the lack of observational evidence of dark matter. Further, new empirical patterns found in rotation curve data such as the Radial Acceleration Rule (RAR) have given new testable features for gravitational theories. In this paper, we revisit two popular surveys of galaxies (Randriamampandry et al 2013 and Bottema et al 2015) which when published were shown to be problematic for alternative gravity. Here, we apply the most recent observational parameters to the surveys and provide fits of Conformal Gravity, MOND as well as the RAR rotation curve formalism and show how these theories can apply to the new findings. We also provide the fits to the RAR and Tully-Fisher relation for each theory and discuss how the RAR may allow for some confining of parameters in the fitting procedure.
Spin and entanglement in general relativity
Authors: Horwitz Lawrence P.
Published: July 2021

In a previous paper, we have shown how the classical and quantum relativistic dynamics of the Stueckelberg-Horwitz-Piron [SHP] theory can be embedded in general relativity (GR). We briefly review the SHP theory here and, in particular, the formulation of the theory of spin in the framework of relativistic quantum theory. We show here how the quantum theory of relativistic spin can be embedded, using a theorem of Abraham, Marsden and Ratiu, and also explicit derivation, into the framework of GR by constructing a local induced representation. The relation to the work of Fock and Ivanenko is also discussed. We show that in a gravitational field there is a highly complex structure for the spin distribution in the support of the wave function. We then discuss entanglement for the spins in a two body system.
Observers, observations and referencing in physics theories
Authors: Ben-Ya’acov U
Published: July 2021

Is it possible to encompass the full extent of the universe within a theory based on a finite set of first principles and inference rules?

The r^ole of observers and observations in physics theories is considered here in the light of G¨odel’s incompleteness theorem. Physics theories are the sum-total that we – humans, scientists, physicists – can make in interpreting our observations of the universe. We are integral part of the universe, together with our observations, therefore acts of observation are also observables and should become part of the phenomena considered by the theory, especially in view of the fact that arbitrarily chosen modes of observations may essentially determine empirical results.

Incompleteness arises in G¨odel’s theorem with self-referential propositions. Observations and interpretations are acts of referencing, and self-referencing occurs in physics whenever the observer is recognized as being part of the observed system. If self-reference appears in physics in simile to G¨odel’s theorem, then incompleteness seems unavoidable in physics.

The article discusses observers and observations as referencing in physics, culminating with the understanding that they are hierarchically inter-related so that a universal physics theory cannot be complete.
The attributes of the Spin-Charge-Family theory giving hope that the theory offers the next step beyond the Standard Model
Authors: Mankoč Borštnik N.S.
Published: July 2021

The assumptions of the standard model are still waiting for an explanation. The spin-charge-family theory is promising in offering not only the explanation for the standard model postulates for quarks and leptons and vector and scalar gauge fields, but also for the cosmological observations, like there are the appearance of the dark matter, the matter-antimatter asymmetry, making several predictions. This theory assumes that the internal space of fermions (spins, handedness and all the charges) are described by the Clifford algebra in d > (13 + 1)-dimensional space, representing in d = (3 + 1) all by the standard model required properties of quarks and leptons and antiquarks and antileptons, with families included. Fermions interact with gravity only (the vielbeins and the two kinds of the spin connection fields), manifesting in d = (3 + 1) as all the vector gauge fields and the scalar gauge fields (higgs scalars and Yukawa couplings). In this talk I overview shortly the achievements of the spin-charge-family theory so far, explaining in particular the new way of the second quantization of fermions, offered by the description of the internal space of fermions with the anticommuting Clifford algebra objects of the odd character.
Massless particle of any spin in static uncharged spherically symmetric curved spacetimes
Authors: Moalem Amnon , Gersten Alexander
Published: July 2021

Quantum equations for massless particles of any spin in static spherically symmetric spacetimes, namely, the Minkowski, FRW and Schwarzschild spacetimes are considered. The metrics of all three are diagonal and their corresponding E2
2 and E3
3 inverse veirbein fields are identical. Thus the angular wave functions are spherical harmonics spinors corresponding to simple modes specified by orbital angular momenta and their z component. By applying consistently a procedure based on variables separation it is shown that the radial wave functions are second order ordinary differential equations sharing the same homogeneous equation though nonhomogeneous terms are different depending on the characteristic E0
0 and E1
1 of each spacetime.
About stabilization in large of gyrostat programmed motion with cavity filled with viscous fluid
Authors: Bezglasnyi S P
Published: July 2021

This paper is concerned with the control problem of nonautonomous programmed attitude motions around the mass centre of a gyrostat with fluid. The goal of this research is to investigate how to solve the problem of stabilization in large the specified programmed attitude motion of gyrostat. Within the framework of this note, the model of single-rotor dynamically symmetrical gyrostat which includes a spherical cavity filled with highly viscous fluid is considered. The program control forces and the stabilizing control forces acted upon the gyrostat are received. The main research methods proposed in this article are the method of Lyapunov functions and the method of limit equations and limit systems. Numerical simulation results illustrate and verify that stabilizing in large programmed attitude motions problem of a gyrostat with viscous fluid is solved.
Attitude motion control of heavy solid body without velocities measurement
Authors: Bezglasnyi S P , Dorogovtseva E V
Published: July 2021

Attitude motion of solid body around a fixed point in the uniform field of gravity is considered. The main result is that some new control method for attitude motion of rigid body without velocities measurement is presented. Two problems of the arbitrary position stabilization and attitude stationary motion stabilization are solved. The stabilizing controls are constructed by the feedback principle without measurement of velocities. This problem is relevant and has an important applied value in engineering. Main results can be used for gyroscopic control systems designing of aircrafts.
A method of generative model design based on irregular data in application to heat transfer problems
Authors: Bykov Nikolay , Hvatov Alexander , Kalyuzhnaya Anna , Boukhanovsky Alexander
Published: July 2021

The paper presents the results of applying the generative design method to reconstruct a model driven by irregular data in the form of a partial differential equation. The problem of non-stationary heating of a metal rod is considered as an example. The finite element method is used to construct templates of possible elements of the derived differential equation. The optimization algorithm for determining a model design is based on the procedure of best subset selection. The efficiency of the method for derivating a model of the thermal conduction process based on irregular data is shown. As irregular data, data obtained on spatial meshes with alternating steps of different size, or a step changing in arithmetic progression, are considered.
On the motion of an Earth satellite after fixing the magnitude of its acceleration as a problem with nonholonomic third-order constraint
Authors: Dodonov V V , Kozlova A S
Published: July 2021

The motion of an artificial Earth satellite with constant absolute value of the acceleration is considered. This requirement is equivalent to imposing a second-order nonlinear nonholonomic constraint or a third-order linear nonholonomic constraint. Two theories of motion of nonholonomic systems with high-order constraints are used for solving this problem. According to the first theory, a consistent system of differential equations is constructed with respect to the generalized coordinates and the Lagrange multipliers; the second theory is based on the application of the generalized Gauss principle. The results are different, although the constraints are satisfied in both theories. It turns out that infinitely many solutions can be built, but using these theories one can find two specific solutions. The question of the difference of these two solutions from the set of all other possible solutions is raised. We also simplify the previously obtained differential equations. The transition to dimensionless variables is made. Three parameters of motion prior to imposition of the constraint are single out, which control the motion after the application of the constraint. The solutions obtained from these theories of motion of nonholonomic systems are compared.
Elastic-plastic analysis of reinforced concrete frame buildings: Developing a new software package
Authors: Ibraheem Anas
Published: July 2021

In this work we will explain a new methodology that have been utilized in a new software package (program) to determine the lateral loads at which a 3D reinforced concrete frame building collapses. The solution is represented by forming the capacity curve (force–displacement) of the structure taking into account the elastic-plastic behavior of the element materials represented by plastic hinges positioned at the ends of the linear elements. This work takes into account only the plastic hinges caused by bending moments. The program is based on finite elements method and capable of analyzing and designing three dimensions buildings. The program provides a drawing environment (3D view, plan view, elevation view) with tools to create the model and to perform the structural analysis and design.
Patient-specific simulation of the blood flow in a proximal femoral artery-graft junction
Authors: Ivanova Y F , Tikhomolova L G , Yukhnev A D , Gataulin Y A , Smirnov E M , Kalmikova R V , Morozov A N , Suprunovich A A , Vrabiy A A , Khubulava G G
Published: July 2021

The paper presents a computational procedure developed for patient-specified blood flow simulation in the proximal anastomosis of femoral-popliteal bypass. The calculations are based on a three-dimensional geometric model constructed from a CT angiography scan of the vascular bed in the anastomotic region and boundary conditions obtained by ultrasound Doppler measurements of the velocity in control sections of the bed. A numerical analysis of 3D pulsating flow structure in a particular model of the proximal anastomosis has been carried out. The model includes sections of the common femoral artery (CFA), the graft, the deep femoral artery and the superficial femoral artery. The Reynolds number based on the CFA inner diameter and the inlet bulk velocity is 880. The sizes and location of stagnant zones, areas with low values of the time-averaged wall shear stress modulus and with high values of the oscillatory shear index are determined. It is shown that the results of the prediction of areas with low values of the time-averaged shear stress modulus are in qualitative agreement with the data of local measurements of neointima thickness formed along the graft wall one year after the operation.
On nonlinear oscillations of time-periodic Hamiltonian systems in the presence of double fourth-order resonances
Authors: Kholostova Olga
Published: July 2021

The motion of a time-periodic Hamiltonian system with two degrees of freedom in a neighborhood of a linearly stable equilibrium is investigated. A double fourth-order resonance (of fundamental and combination types) is assumed to be realized in the system, or the parameters of the problem are close to the resonance values. The problem of the existence and number of resonant periodic motions in a small neighborhood of the equilibrium is investigated; the conditions for their stability in the linear approximation are analyzed. The results are applied to the problem of the motion of a dynamically symmetric satellite (a rigid body) near its stationary rotation (cylindrical precession) in the central Newtonian gravitational field in an elliptical orbit of arbitrary eccentricity.
Simulations of CO2 multi-temperature vibrational kinetics on the basis of new relaxation time models
Authors: Kosareva A , Kustova E , Mekhonoshina M
Published: July 2021

Vibrational relaxation of a single-component carbon dioxide in adiabatic thermal bath is studied in multi-temperature approaches using several models for the vibrational relaxation time. The energy production terms in two- and three-temperature vibrational energy relaxation equations are written in the frame of the common Landau-Teller model as well using corrections based on introducing multi-temperature relaxation times for various vibrational energy exchanges within and between CO2 modes. For the relaxation time evaluation, two theoretical models for the transition probabilities are implemented: the first-order perturbation theory and the forced harmonic oscillator model; several experimental data sets are also assessed. It is shown that the forced harmonic oscillator model provides satisfactory agreement with experimental relaxation times in a wide temperature range. Solutions obtained using the two theoretical models for the transition probabilities show essentially different trends, incubation time and relaxation rate.
An exact solution for a partially clamped rectangle with a crack
Authors: Kovalenko M D , Menshova I V , Kerzhaev A P
Published: July 2021

The article deals with a boundary value problem for a rectangle whose horizontal sides are rigidly clamped, and the ends are free. In the centre of the rectangle, a vertical cut is made on which a discontinuity of the longitudinal displacements is given. An exact solution to the problem is constructed in the form of series in Papkovich–Fadle eigenfunctions. First, the corresponding boundary value problem for an infinite clamped strip is solved, then the solution for a rectangle is superimposed on this solution, with the help of which the boundary conditions at its ends are satisfied. Examples are given in which discontinuities of three types are considered which differ in the smoothness of the discontinuity contour near its ends.
Investigation of shock wave structure in CO2based on the continuum and DSMC approaches
Authors: Kustova E , Alekseev I , Tan L
Published: July 2021

A comparison is made between the continuum and kinetic approaches in studying the shock wave structure in argon, nitrogen, and carbon dioxide. Using the kinetic-theory methods, one-temperature and two-temperature fluid-dynamic equations are derived and closed. Calorically non-perfect gas model is applied, with vibrational energy explicitly calculated. The algorithm for the calculation of transport coefficients including bulk viscosity is implemented. For argon and nitrogen, a good agreement of the solutions obtained using both the continuum approach and direct statistical simulations (DSMC) with experimental results is shown. For carbon dioxide, the one-temperature Navier-Stokes equations do not reproduce non-monotonic temperature behaviour. The two–temperature model yields the results qualitatively similar to those given by DSMC; quantitative discrepancies are however significant. The DSMC relaxation rate strongly depends on the vibrational collision numbers in various CO2modes.
Experimental study and molecular dynamics simulation of carbon nanotubes diffusion
Authors: Rudyak V Ya , Belkin A A , Krasnolutskii S L
Published: July 2021

The diffusion of single-walled carbon nanotubes was studied experimentally and by the molecular dynamics method. The experiments used the dynamic light scattering method. Distributions and average values of diffusion coefficients of molecules of surfactants and nanotubes in nanofluids based on water were obtained. It was found that these distributions, even at low concentrations of nanotubes, can have two maxima corresponding to tubes of different sizes. The effect of centrifugation on the size distribution of nanotubes has been studied. The diffusion of one-dimensional and three-dimensional models of nanotubes in water has been studied by the molecular dynamics method. The velocity autocorrelation functions of of nanotubes of different lengths have been calculated. The presence of a negative region of these functions for small nanotubes has been established. The dependencies of the diffusion coefficient on the length are determined for both models used.
Approaches and collisions of asteroids with the Moon and planets
Authors: Sokolov L L , Balyaev I A , Kuteeva G A , Petrov N A , Eskin B B
Published: July 2021

In this paper we discuss the characteristics of possible collisions of the asteroid Apophis with the Earth. We use the initial conditions published in mid-January 2021 (the nominal orbit NASA), i.e. new observations for Apophis. Estimates of the probability of collisions of dangerous asteroids with planets and the Moon were obtained using the Monte Carlo method.
Forecasting deforestation in the Brazilian Amazon to prioritize conservation efforts
Authors: Jaffé Rodolfo , Nunes Samia , Filipe Dos Santos Jorge , Gastauer Markus , Giannini Tereza C , Jr Wilson Nascimento , Sales Marcio , Souza Carlos M , Souza-Filho Pedro W , Fletcher Robert J
Published: July 2021

As Amazon deforestation rates reach the highest levels observed in the past decade, it is extremely important to direct conservation efforts to regions containing preserved forests with a high risk of deforestation. This requires forecasting deforestation, a complex endeavor due to the interplay of multiple socioeconomic, political, and environmental factors across different spatial and temporal scales. Here we couple high-resolution land-cover maps with Bayesian hierarchical spatial models to identify the main drivers of recent deforestation in the Brazilian Amazon and predict which areas are likely to lose a larger proportion of forest in the next 3 years. Recent deforestation was positively associated with forest edge density, the length of roads and waterways, elevation and terrain slope; and negatively associated with distance to urban areas, roads, and indigenous lands, area designated as protected or indigenous territory, and municipality GDP per capita. From these variables, forest edge density and distance to roads showed the largest effect sizes and highest predictive power. Predictive accuracy was highest for shorter time windows and larger grid sizes. Predicted deforestation was largely concentrated in the North-Eastern portions of the Brazilian Amazon, and amounted to roughly 3, 5, and 6 million hectares for 2020, 2021, and 2022, respectively. About 50% of this predicted deforestation is expected to occur inside protected areas or indigenous lands. Our short-term forecasts can help plan preventive measures to limit deforestation while meeting the specific needs of local areas.
Research on Power Generation and Energy Storage Problems in the Field of Electrical Engineering
Authors: Li Guosheng , Shen Qing , Wang Yang
Published: July 2021

This paper begins with a brief introduction to the “HECT” technology, analyzes the main problems existing in the field of electrical engineering with the “HECT” methods, or from the perspective of “HECT” technology, or by means of “HECT” and some key measures and methods to solve the problems are pointed out. At the same time, many new ideas on power generation and energy storage are put forward. The paper opens up a new channel for the development of electrical engineering technology and its management, which is very creative and eye-opening.
Ganoderma boninense control in palm oil plantations using Trichoderma harzianum in various Media
Authors: Sukariawan Aries , Febrianto Eka Bobby , Sakiah  , Ridho Muhammad , Karnando Doli
Published: July 2021

Ganoderma boninense is a pathogen that can attack palm oil plants. This fungus can cause death, causing a decrease in the number of stands and palm oil production. One alternative to control Ganoderma boninense in palm oil is using the biological agent; ‘Trichoderma harzianum’. This research aimed to examine the inhibition of T. harzianum in various media on different spear leaves accumulations on G. boninense in palm oil plants. The research was arranged in a factorial randomized block design. The first factor was T. harzianum application with different media, the second factor was the accumulation of spear leaves on palm oil trees. The data from the observations were analyzed using the analysis of variance, followed by the DMRT at 5% level. The results of statistical tests showed that the application of T. harzianum in various media had no significant effect on the number of spear leaves at 1.5 months after application (MAA) and G. boninense mycelium at 3 MAA, but had a significant effect on the number of spear leaves at 3 MAA, G. boninense mycelium at 1.5 MAA, T. harzianum mycelium at 1.5 and 3 MAA and also significantly affected the root length at 1.5 and 3 MAA. The accumulation of spear leaves significantly affected at 1.5 and 3 MAA but had no significant effect on the observation of G.boninense mycelium, T. harzianum mycelium and the root lengths at 1.5 and 3 MAA. The interaction between T. harzianum in various media and the accumulation of spear leaves had a significant effect on decreasing the number of spear leaves at 1.5 MAA but had no significant effect on G. boninense mycelium, T. harzianum mycelium and the root lengths at 1.5 and 3 MAA. The application of T. harzianum, which was cultured in various media, was able to reduce the accumulation of spear leaves after 3 months of application. The lowest number of spear leaves was found in T. harzianum application with 25% OPEFB + 75% cow dung compost. The best of T. harzianum media in stimulating palm oil’s root growth was 50% OPEFB + 50% cow dung compost.
Evaluation of the Value of the Defective and Taste of Arabica Coffee (Coffea Arabica L) West Sumatera
Authors: Fadri Rince Alfia , Kesuma Sayuti K , Nazir Novizar , Suliansyah Irfan
Published: July 2021

The purpose of this research is to get information on the value of defectives, water content, taste, and the overall acceptance of Arabica coffee derived from 20 coffee producers in West Sumatera. Taste testing involves trained q grader. The Data of research results analyzed descriptively. The results showed that the quality defectives of coffee is at a quality level from 3 to 5 and 70% quality of coffee in accordance with SNI (Indonesian National Standards) 01-2907-2008. The type of defective in coffee beans is the rupture seeds, brown seeds, black seeds then followed by perforated seeds. Taste of coffee Brew are Excellent Aroma and complex coffee flavor, good acidity and thickness of seeds. Vanilla flavor and taste of fruits and spices. The color of the Arabica coffee powder varies from brown, black and color like cinnamon, As well as overall acceptance kinda like. This indicates the need to implement standard operational procedures to improve the quality of coffee in West Sumatera Framework
Application of Trichoderma as an Alternative to the use of Sulfuric Acid Pesticides in the Control of Diplodia Disease on Pomelo Citrus
Authors: Silvia Mei , Sutarman
Published: July 2021

This study aims to determine the ability of Trichoderma asperellum Tc-Pjn-02 compared to sulfuric acid pesticides in controlling the disease stem rot Diplodia on Pomelo citrus (Citrus maxima) caused by Botryodiplodia theobromae Pat. The research was conducted at Balai Penelitian Tanaman Buah Tropika Kebun Percobaan Kraton-Pasuruan, East Java Province, and the Laboratory of Microbiology and Biotechnology of Universitas Muhammadiyah Sidoarjo in February-April 2020. Trichoderma and sulfuric acid were applied in an aqueous paste formulation each of 10 units of diseased plants with rotten stems which were randomly selected as samples. The data from the observations were tested using the t-test at the real level of 5%. The results showed that Trichoderma sp. had a higher ability in suppressing pathogen attack compared to sulfuric acid which was able to heal rotten wounds on the stalks affected by 41.95% and 26.74%, respectively.
Reproductive characters of hampala fish (hampala macrolepidota kuhl & Van Hasselt, 1823), correlation with body length
Authors: Suryaningsih Suhestri , Sukmaningrum Sri , Amurwanto Adi , Rofiqoh Aswi Andriasari
Published: July 2021

Hampala macrolepidota Kuhl & van Hasselt, 1823, known as Hampala barb or Hampala (Java), have habitat in rivers, lakes and reservoirs. Hampala barb is a member of Cyprinid family, that has an economical value, but it has not been cultivated, its entirely catch from their natural habitat. To anticipate the over need excessive exploitation of domestication efforts. The success of these efforts require a lot of information, one of which is the character of reproduction. This study aims to determine the analysis of multiple characters that include the reproduction of fish trough Gonado Somatic Index (GSI), and fecundity correlated with total length. The research method is survey, fish samples obtained every month, with a simple random sampling technique. The data are carried out by statistical analysis of the correlation between Somatic Gonado Index fund fecundity, with the total length. The results showed that the correlation between IGS male with a body length were positively correlated (r = 0.602), as well as on the female were positively correlated (r = 0.696). Fecundity ranged from 39240-256080 eggs, between fecundity with total length were positively correlated (r = 0.729).
Microbial fuel cell based biocatalyst from traditional market waste water for energy production
Authors: Mardiana Ummy
Published: July 2021

Microbial Fuel Cell (MFC) based on bacteria from Cikurubuk Traditional market waste water has been applied for energy production. We have been observed that there were some potential of microorganims could be applied as renewable source of energy in term of electricity production. A traditional market plays a major role in socio-economics and constitutes a significant aspect of Indonesian culture. One of the major contributors to domestic pollution is a pollution from wastewater traditional market which is containing organic substance and nutriens. This conditions if not properly solved can causes seriously harm the human health and environment. The objective of this study is to develop the waste water treatment technology without energy supply by using the potential activities of microorganism through microbial fuel cell system. We have been determined some biocatalysts from biofilm at the surface of anode. To provide the results some characterizations have been conducted usingChronoamperometry. The optimization of anode conditions have been also studied to maintenance the long performance of MFC. Results confirmed that the biocatalyst activities could be a promising renewable source for energy production and very suitable as an alternative technology based green chemistry technology.
Lithofacies Association of Fluvial Deposit, Walat Formation in Cibadak Area West Java
Authors: Hafiz S D , Firman H , Ramadhan A , Koesmawardhani W T
Published: July 2021

Heterogeneities in fluvial sediment sufficiently vary characteristics based on the sedimentology aspect. The sedimentology analysis is the most important parameter to interpret fluvial architecture. Texture variations and sedimentary structures can define and describe where this sediment was deposited. Walat Formation is one of the fluvial deposit is situated in West java. Based on the observation locations that were carried out, it can be seen the outcrop profile, texture, and sedimentary features of this formation. The first observable lithofacies in this area is facies Gm, wherein this facies comprises pebble or cobble gravel with graded bedding, gravel imbrication, and ripple mark. The second one is facies Gp which comprises gravel stratified with planar cross-beds. The third is facies St, medium to very coarse-grained sandstone with laminae and cross-bed. The fourth is facies Sm, which consists of very fine to coarse-grained sandstone with ripple mark and climbing ripple. Furthermore, facies F1 and C comprises interbedded of sandstone, silt shale, and coal with bioturbation, ripple, and undulatory bedding. The fifth, facies Sh which consists of very fine to very coarse sandstone with sedimentary structures is horizontal lamination. The last but not least, facies Ss comprises fine to coarse sandstone with sedimentary structures small scale scours and cross stratification.
Climate Village Program for Climate Change Adaptation and Mitigation for Green Villages
Authors: Herdiansyah Herdis
Published: July 2021

Climate change has become an issue that is hotly discussed by all countries in the world. Indonesia is included in it and has committed to adapt and mitigate this issue, and specifically set a target of reducing greenhouse gas emissions by 29% from business as usual levels. One of the priority areas for climate change adaptation and mitigation is Jambi Province. Floods and droughts are a few examples of the impacts of climate change. In addition, waste management and inaccurate waste are one of the factors that trigger climate change and public health problems. As an adaptation and mitigation effort on these problems, it is necessary to strengthen and disseminate community resilience to face climate change. Furthermore, community knowledge and skills capacity building for climate change adaptation and mitigation is carried out. Activities are carried out in efforts to adapt and mitigate climate change by holding several activities. These activities include socialization of strengthening community resilience to climate change, strengthening village policies in the context of climate change mitigation, mentoring and training in rainwater harvesting and water saving, tree planting and urban farming, and strengthening the concept of “zero waste” in waste or solid waste management. The purpose of these activities is to provide assistance and training to communities in Tangkit Village, Sungai Gelam District, Muaro Jambi Regency, Jambi Province to increase the capacity of knowledge and skills in adaptation and mitigation efforts to create a green village.
Soybean production response: A study of Jambi’s acreage response under policy program
Authors: Edison  , Renate Dharia
Published: July 2021

Research purpose was to analyse effect of agricultural business in soybean crop. Effect government policy program has be seen through high trend of soybean production in Jambi for three decade (1986-2018). Those policy programs include support price, also input subsidy programs. Differentiation on input acreage, yield, also output has been affected by input price like fertilizer price. Successfulness policy programs can be seen through crucial indicator among important coefficients of policy programs. In some research result, it can be found some policy implications. The first policy implication stated that price support policy is much credible also important for program improvement. Impact of this program of soybean is crucial to analyse response production. In analysing acreage response, method of measuring price expectation is used when variation of market phenomena was affected by price support. Then, results also found that if support price is low from riel price, truncation effect has no effect and price support program has low effect on acreage decisions. On other hand, if price support rate is high, truncation effect is getting higher, and it is much better impact to make acreage decisions. Price soybean elasticity was 0.091 also 0.105 for short-run acreage response and long run respectively. Moreover, it was acceptable on economic and statistical aspects.