bluuebunny/crossref_metadata_2025 huggingface dataset:
Complex diagnostic and numerical study of x-ray and particle emissions under relativistic ultra-short laser-solid interaction
Authors: Eftekhari-Zadeh Ehsan , Loetzsch Robert , Manganelli Lorenzo , Blümcke Manuel Sebastian , Tauschwitz Anna , Uschmann Ingo , Pukhov Alexander , Rosmej Olga , Spielmann Christian , Kartashov Daniil
Published: October 2023

In this report, we present the experimental results on the generation of x-ray emission and particle acceleration using high temporal contrast (∼10–9 at picosecond time scale), ultrashort (

∼
30
fs

), relativistic (

a

0

≈
5

) near-IR laser pulses interacting with Titanium foils. Complex diagnostics, including the energy spectra of accelerated electrons from both front and rear target sides, electron angular distribution and x-ray spectroscopy of the plasma emission were employed. Analysis of the characteristic radiation produced by highly charged Ti+20 ions led to the conclusion that laser-plasma interaction, which leads to the generation of keV hot plasma, occurs at plasma densities 10x higher than relativistic critical electron density. Numerical simulations, including hydrodynamic calculations to model pre-plasma, generated on nanosecond-picosecond time scale under our experimental conditions and relativistic particle-in-cell simulations for main pulse interaction with the plasma reproduce well electron energy and angular distributions. They show the onset of hole boring effect under near normal incidence that leads to plasma density steepening and enables penetration of high intensity laser radiation into the overcritical plasma to much higher densities (up to 30

n

cr

), what is in a good agreement with the results of x-ray spectroscopy.
Performance improvement of junctionless SOI-MOSFETs by a superior depletion technique
Authors: Abrishami Kimia M , Orouji Ali A , Madadi Dariush
Published: October 2023

This work uses a superior depletion technique to present a junctionless silicon-on-insulator (SOI) metal-oxide field-effect transistor (MOSFET) in a 14 nm regime. The suggested technique embeds a P-type area into the buried silicon oxide (SiO2) layer. The p-silicon area has several effects on the proposed structure (EPB-JLSM): First, it helps us attain a full depletion area in the channel. Second, the self-heating improves due to the higher thermal conductivity of silicon than the silicon nitride. Finally, the embedded area causes the lower hole concentration (high Vds at accumulation mode), resulting in a better kink effect. Also, we discuss the impact of inserting the P-silicon area geometry into the buried layer on the DC performance device, such as height and thickness. The P-silicon area decreases the leakage current (IOFF) by three orders of magnitude (∼1000%), and also slightly enhances the drive current (ION) (∼20%), and reduces subthreshold swing (SS) from 186 to 109 mV dec−1 (∼71%) compared to a typical junctionless SOI MOSFET (C-JLSM). Furthermore, we discuss the effect of the buried region and gate insulator materials on the proposed device’s performance.
Stability of Schwarzshild black holes in quadratic gravity
with Weyl curvature domination
Authors: De Felice Antonio , Tsujikawa Shinji
Published: October 2023

We study the linear stability of static and spherically symmetric (SSS)
black holes (BHs) in the presence of a Weyl-squared curvature
besides an Einstein-Hilbert term in the action.
In this theory, there is always an exact Schwarzschild BH
irrespective of the Weyl coupling constant α,
with the appearance of a non-Schwarzschild solution
for a particular range of the coupling of
order |α| ≈ r

h

2 (where r

h
is
the horizon radius).
On the SSS background, we show that the propagating degrees
of freedom (DOFs) are three in the odd-parity sector and four
in the even-parity sector. Since the number of total seven DOFs coincides with those on the Minkowski and isotropic cosmological backgrounds, the Weyl gravity does not pose a strong coupling problem associated with the vanishing kinetic term of dynamical perturbations.
The odd-parity perturbations possess at least one ghost mode,
but the propagation speeds of all three dynamical modes
are luminal.
In the even-parity sector, our analysis, based on the WKB approximation, shows that, besides the appearance of at least one ghost mode, the Schwarzschild solution is prone to both radial and angular Laplacian instabilities of several dynamical perturbations for the Weyl coupling in the range |α| ≫ r

h

2.
For large radial and angular momentum modes, the time scales of such instabilities are much shorter than the horizon distance r

h
divided by the speed of light.
In the coupling regime |α|≲ r

h

2, the WKB approximation does not hold any longer, and a different analysis should be performed
if one wants to state the stability of both the Schwarzschild and
non-Schwarzschild BH solutions in this range of model parameters.
Furnace effect for the Re-C fixed point
Authors: Khlevnoy Boris , Grigoryeva Irina
Published: October 2023

The furnace effect of the rhenium–carbon (Re–C) high-temperature fixed point was experimentally estimated by comparing the point-of-inflection temperature of the melting plateau demonstrated by the same Re–C cell in three furnaces of different dimensions. Two cells with the same outer size but different blackbody cavity designs were used. After corrections of the measured temperature for the size-of-source effect and the pyrometer stability, the furnace effect, estimated as the maximum change of the Re–C temperature from furnace to furnace, was found to be 0.094 K for the ‘best’ realisation of the fixed point. For the ‘normal’ realisation, additional components of the furnace effect, associated with non-optimal use of the fixed-point cell and furnace, were considered. The uncertainty components of the Re–C fixed point realisation associated with the furnace effect were estimated to be 0.060 K and 0.110 K for the best and normal cases, respectively.
Grid density effect for numerical simulation of civil aircraft in post stall
Authors: Zhang Lu , Mou Yongfei , Liu Fan , Ma Shuai , Cui Xingda
Published: October 2023

Stall will deteriorate flight safety and cause serious accidents for civil aircraft. RANS-LES hybrid approaches have become a compromise choice due to insufficient ability of RANS for large flow separation. In present work, Zonal Detached-eddy-simulation coupled with high-order spatial scheme were employed to investigated grid density effect in the numerical simulations. The calculations show that the grid density would affect the numerical simulation of the small-scale flow structure in the wake of region of the main wing, and further affect the disturbance of main wing to the horizontal tail. It is necessary to properly densify the grid downstream of the main wing in order to accurately predict the aircraft stall.
Influence of parameterization method and optimization algorithm on airfoil optimization
Authors: Zhou Jinxin , Jia Hongyin , Wu Xiaojun , Zhang Peihong , Yu Jing , Zhou Guiyu , Chen Bing , Luo Lei , Mo Tao , Jiang Anlin
Published: October 2023

In this study, the impact of parameterization methods and optimization algorithms on the optimization results of the RAE2822 airfoil is examined. Specifically, how variations in the number of design variables, spacing of control points, the scaling scale of the objective function, and line search step of different FFD parameterization methods affect the resistance convergence process are investigated. The results indicate that the number of design variables and the spacing of control points play a significant role in the speed and minimum value of resistance convergence. In contrast, the scaling scale of the objective function and the line search step has a relatively minor impact on resistance optimization.
Numerical Simulation and Flow Display of Bionic Alula on Rectangle Airfoils
Authors: Sa Haijing , Xu Fei , Wang Yifan , Ma Wenxuan , Hu Tianxiang , Zhang Wenyi
Published: October 2023

Some birds have small wings (Alula) in the middle of their main wings. These small wings will tilt upward when the bird flies at a high attack angle to maintain a stable flying posture. This paper explores the lift effects of bionic Alula on rectangular airfoils with different aspect ratios through numerical simulation and flow display experiments. According to the numerical simulation, Alula can increase the rectangular airfoil lift coefficient by a maximum of 24% when the airfoil aspect ratio is 2. By comparing simulation results with flow display results, the low-pressure area generated by Alula and the merge of the Alula vortices with the airfoil tip vortices mainly contribute to the lift enhancement.
Research on Rotation/Curvature Correction Method of SA Turbulence Model for Numerical Simulation of Axial Compressor
Authors: Wang Ziwei , Cao Jie , Chen Keyan , Li Baiyu , Li Bin
Published: October 2023

The strong rotation effect exists in the flow of compressors, but it is rarely considered in the common turbulence models used in numerical simulation. In addition, when the widely used turbulence model is applied to the numerical simulation of compressor flow, it often needs to be modified. In order to evaluate the applicability of various turbulence model modification methods in axial compressor flow simulation, and explore suitable modification methods. Based on the numerical simulation software ASPAC for axial flow compressor developed by our research group, three turbulence model rotation/curvature correction methods were implemented based on SA turbulence model and applied to the flow simulation of Rotor 37. The results show that the modified models mainly affect the flow separation of the rotor suction surface. Specifically, the SA-Helicity model improves the prediction accuracy of the separation flow in the compressor. The total temperature and pressure calculated by SA-R and SA-RC models are on the small side. In this study, the applicability of rotation/curvature correction method of various SA turbulence models in compressor flow simulation is evaluated in detail based on transonic compressor, which provides a basis for the selection of turbulence models and the research of turbulence model and correction methods adapted to compressor simulations.
Numerical Investigation of Pin Fin Types on the Thermal Improvement of H2/Air Micro Burner
Authors: He Ziqiang , Kang Dugang , Wang Fei , Huang Song , Chen Qiaoqiao , Li Xiuquan
Published: October 2023

The micro-thermophotovoltaic system is a prospective power generation system. The radiation performance of exterior walls is a critical component of MTPV, as it effectively determines the overall energy output. At a mixture intake speed of 10 m/s, the MCPFs-Diamond exhibits the most favourable thermal performance, as evidenced by the thermal distribution and the highest average temperature of the exterior walls, which measures 1255.3 K. Its available radiation energy can reach up to 43.6 W. In the case of micro combustors that incorporate alternative shapes of pin fins, the highest values for both the average external wall temperature and the available radiational energy are achieved when the gas intake speed is set to 8 m/s.
Study on the Influence of Offshore Elevated Flare on the Layout of LNG Terminal
Authors: Hu Xingqiao , Zhang Luchao , Gao Yuan
Published: October 2023

In order to save land, the elevated flare of the LNG terminal is usually considered to be arranged on the sea. The thermal radiation and leakage evaporation diffusion of elevated flare are the key issues to be considered in the plane layout of the wharf. In this paper, the physical process of the flare thermal radiation and the evaporation and diffusion of the terminal sump are analyzed by using engineering knowledge. Combined with the theory of thermal radiation and vapor diffusion and the actual project scenario, the corresponding mathematical model is given and applied to the engineering practice for a large number of calculations. The following conclusions are drawn: (1) The thermal radiation received by the LNG terminal is weakly related to the flare height, that is, the effect of increasing the flare height to control the thermal radiation at the header is not obvious; There is a linear positive correlation with the flare treatment capacity; It is strongly inversely proportional to the distance from the wharf to the flare. It is preferred to reduce the thermal radiation intensity at the wharf by adjusting the distance between the wharf and the flare. When the distance between the wharf and the flare is greater than 100m, the thermal radiation value of the wharf is always less than the specified limit. (2) Within the scope of conventional design, the safe distance between the wharf working platform and the flare is about 20∼90m; The optimal safe distance between the wharf fire control room, bridge approach pipe gallery and the flare should be greater than 61m and 41m respectively. (3) The combustible vapor concentration at the flare is linearly and positively correlated with the flare height, so the flare height should be reduced as much as possible during design. (4) The combustible vapor concentration at the flare is negatively correlated with the distance from the flare to the terminal sump. It is found that the distance should not be less than 180m through calculation. When the distance is more than 300m, the combustible vapor concentration at the flare has little relationship with the flare height and the ambient wind speed. When the distance is more than 340m, the combustible vapor concentration at the flare is always less than the specified limit.
3D numerical investigation on flow boiling characteristics in large length-to-diameter ratio microchannel
Authors: Huang Zhen , Chen Li , Peng Xiaohai , Wang Songchao , Zhao Dan , Zhao Changying , Liu Gang
Published: October 2023

To meet the demand of thermal management with large power and high heat flux in the future engineering applications, more and more attentions have been draw to develop the two-phase microchannel cooling technology. In this work, a three dimensional numerical investigation is performed to study the influence of mass flux and heat flux on the two phase flow boiling characteristics in a single microchannel with large length-to-diameter ratio. The related calculation results show that the Volume of Fluid (VOF) model coupled with Lee model can predict the two phase pressure drop and heat transfer coefficient of the microchannel well. And the flow patterns in the microchannel are classified as bubbly flow, slug flow and annular flow, which can be captured by this numerical model precisely. Besides, the transient pressure drop augments with the increase of mass flux. But the effect of mass flux on the amplitude of quasi-steady pressure drop and the peak value of time-averaged heat transfer coefficient along the microchannel is small. At last, the amplitude of quasi-steady pressure drop increases with the augmentation of heat flux. The maximum and fully developed time-averaged heat transfer coefficients along the microchannel increase with the heat flux.
Numerical Simulation of Jet Penetration for Typical Targets
Authors: Wang Yun , Dong Liang , Shen Zhiben , Cao Weiwu , Wu Jianwei
Published: October 2023

In view of a typical target, the numerical simulation of the jet penetration produced by a working part is carried out. Based on the fluid-solid coupling method, the process of the jet forming and penetration into a target by a front stage working section in series are calculated and simulated by using the MSC.DYTRAN numerical simulation software. On the basis of the calculation and simulation results, the penetration effects of the front stage working section in series on the targets with different thicknesses in the air-medium and water-medium environments are comparatively analyzed.
Research on the characteristics of projectile penetration into water based on fluid-structure Interaction
Authors: Xu Pengzhao , Ma Guangsong , Zhao Ning , Shi Kunlin
Published: October 2023

To study the water entry characteristics such as fuze overload, projectile overload and water-gas interface change during the penetration of projectile from air to water at different angles. Using the HyperMesh/LS-Dyna joint simulation tool and the fluid-structure-Interaction algorithm, the relevant characteristics of the projectile penetrating water at different angles (30 °, 60 °, 90 °) are simulated numerically. The numerical simulation results show that the axial overload peak of the projectile is almost unchanged when the projectile penetrates the water at different angles, and the axial overload peak of the fuze decreases with the increase of the angle. Both the radial overload peak of the projectile and the fuze decrease with increasing water entry angle. The results show that the shock wave generated when the projectile penetrates into the water has a greater effect on the radial overload of the projectile and fuze than on the axial overload.
Investigation of Droplet Dynamics Under Shear Flow
Authors: Li Zilong , Tao Yuequn , Liu Qiusheng
Published: October 2023

The dynamics of droplet under shear flow was investigated in normal gravity and microgravity. Drop under shear flow has many applications in aerospace such as aircraft de-icing and environmental control and life support system in space station. Shape analysis of the droplet showed that drop in microgravity have a greater contact angle and height, but a smaller contact radius, than that in normal gravity. The difference between advancing and receding contact angle θa-θr
is greater in microgravity than that in normal gravity under the same wind speed. The effect of airflow on the droplet is mainly dependent on the We number and the dimensionless number k′, which characterizes the ratio of wind force and adhesion force. the k’ in microgravity is larger than that in normal gravity. The droplet exposed to airflow from static to motion state can be divided into three regimes.
Validation metric of multi-output model based on energy distance
Authors: Zhao Jiao , Xiao Wei , Chen Jiangtao , Shen Yingying , Lv Luogeng
Published: October 2023

Model validation metrics have been developed to provide a quantitative measure that characterizes the agreement between predictions and observations. The validation metric of multi-output model has the problem of solving the joint probability density fuction (PDF). The traditional method is to reduce the dimension, but this may lead to the loss of some information. To avoid solving the joint PDF, this paper gives a validation metric method of multi-output model based on energy distance. At the same time, it avoids the problem of information loss caused by dimensionality reduction, and greatly reduces the difficulty of calculation. Then using mathematical examples, a set of numerical studies are designed to verify the correctness and stability of the method. Finally, we apply the metric to the Sandia validation challenge problem.
Influence of oblique magnetic fields on the periodicity of large-scale intermittent states in channel flow
Authors: Li Sen , Li Shunzhi , Shi Xiaomeng , Wang Lebing , Dong Shuai
Published: October 2023

Further investigation of the large-scale intermittent states in channel flow reveals that the addition of a streamwise magnetic field and the original spanwise magnetic field has an effect on the cycle of the large-scale intermittent states. We also studied the effect of oblique magnetic field directions on the large-scale intermittent state. It is found that the introduction of a streamwise magnetic field increases the cycle time of the circulation.
Study on the performance of the dust removal efficiency test device
Authors: Zou Junchen , Wu Feiyang , Huang Wenhao , Sun Xiaoqun , Wang Yanzhao , Yang Ling , Ma Zhenxing
Published: October 2023

In China, the particulate matter (PM) pollution has caused serious environmental and health concerns, and it is still a huge challenge to control PM pollution. In order to alleviate the hazardous of PM pollution, the dust collector is widely used to separate PM from gas streams. However, after a period of operating, whether the removal efficiency of the dust collector still meet the requirement of the emission limit is unknown. The dust removal efficiency test device was designed and its performance was investigated in this study. The flow field simulation result showed that the test device had a good uniformity, which was consistent with previous measured result. Moreover, it found that the linear relationship between the light scattering concentration and the filtration membrane weighed concentration was y=2.285x, and when the inlet wind speed was about 0.5 m/s, the dust removal efficiency of the dust collector was more than 99.73%, the outlet dust concentration was (0.03-0.04) mg/m3, which was below the emission limit of 15 mg/m3. When the inlet dust concentration was about 200 mg/m3 and the inlet wind speed was (0.25-0.75) m/s, the dust removal efficiency was more than 99.98%. To sum up, the designed test device can be used to estimate the dust removal efficiency of various types of dust collectors.
Hydrodynamic analysis of journal bearing considering the effects of cavitation and minuscule particle
Authors: Zhou Yong , Shi Xiaofang , Chen Yu , Wang Ling , Chen Chen
Published: October 2023

Journal bearing is the general element in the mechanical systems, which can provide the rotational motion of joints. The hydrodynamic analysis model of journal bearing is established and the effects of cavitation and minuscule particle are considered in the simulation model. The cavitation effects would be represented by the mixture model. Based on the CFD and DPM technology, the mixture lubrication medium of journal bearing is developed, which includes the minuscule element of solid in the lubrication film. And, the effects of structural parameters and operation conditions on the hydrodynamic characteristics of journal bearing is investigated. The simulation results could provide the suggestion for the design of structure and working condition.
ICE-BEES Conference 2023: Re-thinking the Dynamization between Environmental Issues and Adaptive Technology for Inclusive Growth
Authors: Arifin R. , Setiawan A. B. , Wijaya A. P. , Jati K. W. , Budiantoro R. , Rahmaningtyas W. , Utaminingsih N. S.
Published: October 2023

The ICE-BEES Conference 2023 is one of the conferences held by Universitas Negeri Semarang. The conference aims to promote the green aspect and environmental sustainability in the multidisciplinary perspectives. The conference is also to support the Universitas Negeri Semarang (UNNES), as the Conservation-based Research University which in line with UNNES development. The development of UNNES as a Conservation-minded University has three objectives. First, support the government’s efforts in managing living, non-living and ecosystem natural resources. Second, protecting, preserving, and utilizing natural resources in a sustainable manner through education, research, and community service activities. Third, foster a mental attitude, behavior, which is responsible and motivates the academic community and other UNNES citizens to implement the conservation of values and character, art and culture, as well as natural resources and the environment. UNNES has been active in giving its contribution to the beloved country of Indonesia and the world so that the earth it inhabits is more comfortable. Conservation insights become a shared reference and are used by the academic community as an academic community. Conservation insight occupies a central position, especially as a system that directs and guides conservation attitudes and behavior.
Optimizing the Potential of Agricultural Land to Maintain the Production Sustainability (Empirical Study at West Papua)
Authors: Fafurida  , Hapsari M , Marpaung G N
Published: October 2023

West Papua is one of the provinces in Indonesia that has great land potential to be utilized as agricultural land, but this land has not been optimally utilized to support agricultural activities and yields in West Papua. This research aims at determine the land optimization model and determining the optimal agricultural land area in West Papua Province. This research uses a quantitative approach with secondary data and the data collection is conducted by documentation method. The analysis used in this research is Linear Programming. The results of research indicate that the optimal land area to be used as agricultural land in West Papua Province for food crops and horticulture is 1.60% and the land area for plantation crops is 2.31% of the existing land area without reducing the area forest area in West Papua Province.
Green-pesantren and environmental knowledge and awareness: case study at Pondok Pesantren As Salafy Al Asror Semarang
Authors: Nurkhin A. , Martono S. , Ngabiyanto N. , Mukhibad H. , Rohman A. , Kholid A. M.
Published: October 2023

Green-pesantren or eco-pesantren have become an important concern in improving environmental knowledge and awareness for all parties, including Pondok Pesantren (Islamic boarding schools) in Indonesia. This research aimed to describe the level of student’s environmental knowledge and awareness and explore the efforts that had been made at Pondok Pesantren As Salafy Al Asror in Semarang to improve environmental knowledge and awareness for Santri (Students), Ustadz (Teachers), and residents of Pondok Pesantren. The research was conducted quantitatively and qualitatively to capture the phenomenon in more depth. The informants included Santri, Ustadz, and caretakers of Pondok Pesantren As Salafy Al Asror in Semarang. Data collection methods used interviews and documentation. The data analysis method used is descriptive quantitative and interpretive qualitative analysis. The research findings indicated that Pondok Pesantren As Salafy Al Asror had paid sufficient attention to the concept of green-pesantren or eco-pesantren. The management had tried to raise environmental knowledge and awareness for Santri, Ustadz and Pondok Pesantren stakeholders. Efforts that had been made include the provision of adequate trash bins, regular cottage community service agendas, sanitation arrangements, and environmental awareness education. However, there were still many things that needed to be addressed, such as waste management and infrastructure management that cared more about the environment. Provision of alternative sources of electricity through solar electricity and utilization of clean and healthy water sources was an important matter that must be addressed by Pondok Pesantren management.
Environmental disclosures in mining companies: are there any stakeholder demands?
Authors: Amelia R. W. , Suhardjanto D. , Probohudono A. N. , Honggowati S.
Published: October 2023

This research investigates the influence of stakeholder demands on environmental disclosure in mining companies in ASEAN. The influence of these stakeholders is analyzed using the stakeholder theory framework. The research sample is 100 companies in the mining industry listed in the OSIRIS database in 2017-2019. This research uses seven independent variables that represent the strengths of three stakeholder groups. Environmental disclosure data is obtained using content analysis from annual reports and company sustainability. Shareholders, creditors, and auditors were found to be significant predictors of environmental disclosure in mining companies. On the contrary, creditor’s demands are not seen as driving corporate environmental disclosure in most ASEAN countries but have a significant effect in Philippine. In general, this research is in line with stakeholder theory which encourages companies to pay attention to the demands of stakeholders to carry out the best corporate social responsibility, especially on environmental disclosure.
Environmental, Social, and Economic Sustainability: Do Big Companies in Indonesia Care?
Authors: Widhiastuti R. , Aeni I. N. , Susilowati N. , Rahmaningtyas W. , Farliana N.
Published: October 2023

Companies are the main actors that utilize Indonesia’s natural resources, the responsibility of maintaining surrounding conditions such as environmental, social, and economic is an absolute responsibility that cannot be avoided. This study aims to determine the motivation of management in providing accountability for its activities to stakeholders. Through the lens of stakeholder theory, it is expected to find out the management’s efforts in showing the public all its accountability activities. LQ45 companies are the largest companies that are fully trusted by various stakeholders to be the main attraction for research studies. The sustainability report prepared throughout 2019-2022 and research data analyzed using moderation regression analysis is expected to provide an overview of the company’s concern for the surrounding. The results show the environmental, social, and economic sustainability of large companies in Indonesia is captured in the report shows a weak level, their concern increases when the company experiences an increase in profits. Pressure from various company stakeholders does not necessarily increase their concerns. The company will be encouraged to disclose when the company experiences an increase in profitability. However, creditors provide the most dominant pressure to make companies open about their activities. Suggestions for future research can use other theoretical perspectives such as legitimacy and stewardship in seeing management’s concerns.
Exploring an Environmental Awareness of Economics Teachers
Authors: Mudrikah S. , Widia S. , Setiyani R.
Published: October 2023

Environmental education has long been taught in schools. Still, the impact and results of environmental education that have been carried out in schools have not been seen, both in society and the environment. Teachers have a key role in helping students develop awareness of the importance of preserving and protecting the environment. By providing a comprehensive understanding of environmental issues, teachers can help students understand the negative impact of human behaviour on the environment and why it is important for them to become agents of change who care about the environment. The purpose of this study was to determine the perceptions, beliefs, and practices of caring for the environment among teachers. The population of the study was high school economics teachers in Semarang City, the sampling technique used was saturated sampling, totalling 136 teachers—data collection techniques using questionnaires and data analysis using descriptive and independent sample t-tests. The results showed that the average perception, belief and practice of caring for the environment obtained a fairly high score. In addition, from the results of the independent sample t-test, no differences were found between male and female teachers in terms of perceptions, beliefs and practices of caring for the environment.
Comparative Study of The Life Cycle Assessment Model for Agricultural Solid Waste Management: Case Studies in East Ungaran and West Ungaran Districts, Semarang
Authors: Arief Budihardjo M , Setiyo Huboyo H , Priya Kurniatama D V
Published: October 2023

The increase in population affects the production of available food; this also increases agricultural activities and the waste produced. Improper agricultural waste management harms the environment, so a good agricultural waste management strategy is needed. The areas that are the object of study are East Ungaran and West Ungaran Districts, Semarang Regency. This area has great potential in the agricultural sector. This plan aims to analyze the existing conditions, volume, and mass balance of agricultural waste and their environmental impact using the life cycle assessment (LCA) and material flow analysis (MFA) methods to determine the appropriate strategy for managing agricultural solid waste. It is planned to manage agricultural solid waste using two alternative solutions, which are then compared using the LCA method using the SimaPro application and the Analytical Hierarchy Process (AHP) method involving two experts in the agricultural sector. Based on the analysis, processing agricultural solid waste as bokashi fertilizer and silage livestock feed is the most suitable method and is of interest to farmers.
Environmental Management Accounting Adoption in Gunungpati Community Self-Help Group (CSHG) – A Case Study
Authors: Susilowati N , Mahmud A , Widhiastuti R , Santoso A
Published: October 2023

Public organizations increase awareness of environmental issues by encouraging Environmental Management Accounting (EMA), which has been said to deliver numerous benefits to users. This paper proposes to investigate the adoption of EMA in public corporatized water supply organizations. This study was a case study in the Gunungpati Community Self-Help Group (CSHG). Data was from interviews with managers, internal data, and financial report documents. Data were analyzed using the Miles and Huberman technique including data reduction, data presentation, and conclusions. The findings show that Gunungpati CSHG provides water and sanitation services to 198 households, distributing to an estimated population of 103,000 individuals. Five broad categories were identified, four containing physical and monetary information. Product output, non-product output, waste flows, indirect costs, and externalities exist. They produce the volume of water purchased and extracted, water lost, environmental benefits from water recycling, potable water substituted with river saved, and damage to river health from operations. Meanwhile, the organization pay attention to the impact of the organization on the environment to maintain the ecosystem.
Analysis of Fertilizer Raw Materials and Environmental Degradation: Using Granger Causality
Authors: Oktavilia S. , Damayanti N.
Published: October 2023

This study aims to examine the relationship between fertilizer raw materials and environmental degradation using the Granger causality test. This study uses data from World Bank Commodity Prices for fertilizer raw materials in the form of price data for phosphate, potash, and natural gas in the U.S. Dollar/metric tons and environmental degradation in the form of CO2 Emissions from methane and process emissions data from British Petroleum (BP) from 1990-2021. The methods are stationarity test, cointegration test, and Granger causality test. The results of the analysis state that there is no bidirectional relationship between these variables, but there is a one-way relationship where environmental degradation affects the price of raw materials for potash and phosphate fertilizers, and the price of natural gas is affected by environmental degradation. The implication of this research is the need to apply incentives to producers and consumers of fertilizers in the use of fertilizers to improve environmental quality.
A Case Study: How Does Green Market Orientation Impact MSMEs Marketing Performance Through Organizational Ambidexterity?
Authors: Febriatmoko B. , Prananta W. , Wijaya A. P.
Published: October 2023

Environmental issues are a serious concern in several countries including Indonesia. Sustainable national development still pays attention to environmental conservation efforts. One of the business entities that has an important role in national development is the Small Micro and Medium Enterprises (MSMEs) sector. This study seeks to understand how green market orientation impacts MSMEs’ marketing performance through organizational ambidexterity. The sample in this study were 117 MSMEs in the city of Semarang. The method used is outer model and inner model analysis with intervening variables using Smart PLS. From the statistical tests conducted, it was found that green market orientation (GMO) affects marketing performance directly and indirectly through organizational ambidexterity. This shows that if GMO is getting better, it can increase the level of marketing performance both directly and through intervening organizational ambidexterity.
ISO Certification, Firm Characteristics and Carbon Emission Disclosure
Authors: Chariri A. , Januarti I. , Yuyetta E. N. A.
Published: October 2023

Companies’ activities have contributed to the increase in carbon emissions, which lead to the negative impact on the environment. This phenomenon has motivated companies to voluntarily disclose carbon emission disclosure. Considering this disclosure issues, our study aims to investigate the effect of ISO certification, type of industry, profitability, and firm size on carbon emission disclosure. The population consists of companies listed in the Carbon Disclosure Project (CDP) of Nordic with total sample of 131 companies. Data were then analyzed using a multiple linear regression. The findings showed that profitability and firm size positive effect on carbon emission disclosure. Meanwhile, ISO certification and type of industry had no effect on carbon emission disclosure. This implied that ISO certification is seen as a symbolic strategy of carbon emission management.
The Dilem Wilis Agro Tourism Community’s Development Using the Sociopreneurship Model to Achieve Sustainable Tourism Development
Authors: Putri D. M. , Sayono J. , Ridhoi R. , Thoriquttyas T.
Published: October 2023

Tourism development is required to maintain sustainability and environmental ecosystem preservation while taking into account the socio-cultural conditions of the local population, so that it may be maintained and enjoyed by future generations. The ability of society to manage tourism potential is a fundamental point in maintaining the tourism business. Society acts as a host with the resources they have, both in the form of customs, traditions, and culture. One of the development models that can be applied to society is sociopreneurship. Through this model, people not only think for themselves but also for others and the environment around them. This study aims to examine the potential implementation of the sociopreneurship model in the development of the Dillem Wilis Agrotourism community, Trenggalek Regency. The method used is qualitative. The data source from this study came from key informants, the Dillem Wilis Agrotourism society. Determination of respondents in this study by means of snowball sampling. Data collection techniques used in-depth interviews, observation, and documentation. The data analysis used is data reduction, data presentation, and drawing conclusions. Based on the study’s results, it can be concluded that the sociopreneurship model can be well received by the Dillem Wilis Agrotourism Society. Through sociopreneurship community involvement in tourism development can be maximized in line with the realization of Sustainable Tourism Development.
Capturing the Opportunity of Green Economic Policy for Environmental Sustainability
Authors: Rodiyah R , Arifin R , Wulansarie R , Baiquni M I , Zainurohmah Z
Published: October 2023

This research paper focuses on the concept of green economics policy as a means to achieve environmental sustainability. The paper begins by defining green economics policy as an approach that promotes sustainable economic growth while also protecting the environment. It argues that a shift towards a green economy is necessary to address the current environmentalchallenges facing the planet. The paper examines the key elements of a green economics policy,which include promoting renewable energy sources, investing in sustainable infrastructure, supporting sustainable agriculture practices, and incentivizing businesses to adopt environmentally friendly practices. The paper highlights the importance of policy coherence and coordination across different sectors and levels of government to ensure a successful transition to a green economy. The research also discusses the potential benefits of a green economics policy, such as the creation of green jobs, the reduction of greenhouse gas emissions, and improved public health outcomes. The paper emphasizes the importance of engaging stakeholders in the policymaking process, including civil society organizations, businesses, and affected communities, to ensure that the policy is equitable and socially just. The paperconcludes by highlighting the urgent need for governments to adopt green economics policies to address the environmental crisis. It emphasizes the importance of international cooperation tosupport countries in transitioning to a green economy and the need for innovative financing mechanisms to support sustainable development. The paper argues that a green economics policy offers a viable path towards achieving environmental sustainability while also promoting economic growth and social equity.
Performance and mechanisms of active attapulgite-supported sulfidated nanoscale zero-valent iron materials for Pb(II) removal from aqueous solution
Authors: Song Xiaosan , Song Xichen , Dai Liang
Published: October 2023

To inhibit the oxidation, passivation, and agglomeration of nano-zero-valent iron (nZVI), a liquid phase reduction method was used to load sulfurized nZVI onto acid-modified ATP with attapulgite (ATP) as the carrier (S-nZVI@ATP). The performance and mechanism of this material were studied for Pb2+ removal in water. The S-nZVI@ATP preparation prevents the agglomeration of nZVI particles and reduces nZVI oxidation. Pb2+ removal proceeds efficiently and stably when using S-nZVI@ATP at pH values ranging from 2.5–5.5. According to the electron sharing and transfer-based pseudo-second-order kinetic model, the Pb2+ is adsorbed onto S-nZVI@ATP, and the speed control step is completed by liquid film diffusion and intraparticle diffusion. The S-nZVI@ATP mediated Pb2+ adsorption is well-described by Freundlich’s isothermal adsorption model, which is a multilayer chemical adsorption process. The temperature and initial Pb2+ concentration were varied, and it was determined that Pb2+ adsorbs on S-nZVI@ATP in an endothermic reaction. This S-nZVI@ATP composite material has high reducibility, high surface activity, and good adsorption properties for Pb2+. Tests were performed for 24 h using adsorbent (1 g l−1) in Pb2+ solution (30 ml). For an initial Pb2+ concentration of 700 mg l−1, S−1-nZVI@ATP removes 57.37% of the Pb2+ and has an adsorption capacity of 401.60 mg g−1. In addition to forming PbS and Pb(OH)2 precipitates, Pb2+ also complexes with the Fe/H oxide shell of S-nZVI@ATP, and Fe0 reduces some Pb2+ on the nZVI to Pb0. The results exhibited that S-nZVI@ATP has excellent potential as an adsorbent for the removal of Pb2+ from the industrial wastewater.
Effect of microstructural characteristics on the impact fracture behavior of cryogenic 9Ni steel
Authors: Zhang Hongliang , Li Xinling , Zhao Qibin , Hou Jiaping , Zhang Dazheng , Xu Jiakai , Li Weijuan
Published: October 2023

The percentage of shear fracture largely determines the service performance of 9Ni steel used in low-temperature pressure vessels. Through elemental analysis, microstructural characterization, and mechanical property tests, this study investigates why the percentage of shear fractures is low in 9Ni steel and clarifies the mechanism by which the microstructural characteristics influence the low-temperature impact behavior of 9Ni steel. It was found that cleavage fracture zones, formed when segregation bands appear in the microstructure, decrease the percentage of shear fractures at the impact fracture surface. Specifically, as the segregation area increases from 0.9% to 7.1%, the shear-fracture percentage in 9Ni steel sharply decreases from 100% to 65%, accompanied by a deterioration in low-temperature toughness. The segregation zone is enriched in austenite-forming elements (Ni, C, Mn), leading to a tempered martensite microstructure with a lath shape. The small number of high-angle grain boundaries and low interface bonding strength cannot effectively prevent crack initiation and propagation, resulting in brittle cleavage fracture. In contrast, the non-segregated zone is tempered sorbite with a uniform structure, several high-angle grain boundaries, and a high interface bonding strength. These features hinder crack initiation and propagation. Furthermore, the shear-fracture zone generated in the non-segregated zone exhibits ductile fracture characteristics.
Minimal realizations of the KP hierarchy, its strict version and their reductions
Authors: Helminck G. , Panasenko E.
Published: October 2023

We discuss here realizations of the KP hierarchy, its strict version and their reductions, the

n
n

-KdV hierarchy and the strict

n
n

-KdV hierarchy, that have a minimal dependence between the different coefficients of a solution of them, the so-called minimal realizations. Thereto we discuss all these deformations from a wider perspective and consider them in a presetting instead of a setting. In this more general set-up we will present a number of

C

\mathbb {C}

-subalgebras of

R
R

that are stable under the basic

C

\mathbb {C}

-linear derivations of

R
R

and such that these derivations commute on these

C

\mathbb {C}

-subalgebras. This we apply at the introduction of the minimal realizations of all deformations, we show how these realizations relate to solutions in different settings and use them to show that all hierarchies under consideration possess invariant scaling transformations.
Measurement of random operators, jet geometry and high-order phase transitions
Authors: Lychagin Valentin
Published: October 2023

In this paper, we discuss various geometrical structures appearing in study of random linear operators that act between finite-dimensional vector spaces. We show that they are closely connected to the geometry of the jet bundles over a manifold of the extreme probability measures. Thus, the high-order phase transitions appear as singularity in prolongations of the state manifolds.
T-cell large granular lymphocytic leukemia in Vietnam: Using microscope-to-screen videoconferencing to improve diagnosis
Authors: Dayton Vanessa J , Thien Dang Hoang , Ngon Huynh Thien , Arries Cade , Sang Nguyen Ngoc , Lien Nguyen Phuong , Kinder Scott , Dung Phu Chi
Published: October 2023

Objectives

Leukemia diagnosis in Vietnam is limited by a lack of hematopathology training and expert consultation as well as the cost of high-magnification digitization of hematology slides. Screen-sharing software allows international collaboration with experienced hematopathologists for improved diagnostic accuracy.

Methods

A hematopathology education and consultation program was proposed for Vietnam hospitals. By appointment, pathologists in Vietnam with access to a microscope camera, imaging software, and high-speed internet were invited to review slides and data with a volunteer board-certified hematopathologist in the United States using secure videoconferencing software. A single hospital in southern Vietnam assigned a pathologist proficient in English to access this service. All consultations from this site with clinicopathologic information were logged. After a 2-year period of online consultation, case slides for selected diagnoses were reviewed under the microscope in Vietnam to assess concordance.

Results

In total, 135 consultations were logged, 53 of which were for blood and bone marrow. T-cell large granular lymphocytic leukemia (T-LGLL) was 1 of the most frequent bone marrow consultation-related diagnoses; all diagnoses of this entity were confirmed by in-person microscopy (100% concordance). A records search and physician surveys found no prior documented diagnoses of T-LGLL made in Vietnam before this education and consultation program.

Conclusions

Our virtual consultation model has improved patient care in Vietnam by providing correct diagnoses to inform best practices in treatment. As a result of our program, the first Vietnam diagnoses of T-LGLL were made and may help expand on the literature in this area. This model could provide cost-effective, real-time consultation and education services for pathologists in underserved communities.