检索结果-南通市图书馆

Assessment of corrected time-step method for nominal ionospheric gradient calculation: A comparative analysis with spatial approaches

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Earth and Planetary Physics 2024年第4期8卷 641-649页

作者： Slamet Supriadi Prayitno Abadi Susumu Saito Harry Bangkit Dwiko Unggul Prabowo adi Purwono Ginaldi Ari nugroho Research Center for Smart Mechatronics National Research and Innovation Agency(BRIN)BandungIndonesia Research Center for Climate and Atmosphere BRINBandungIndonesia School of Electrical Engineering Telkom UniversityKab.BandungIndonesia Electronic Navigation Research Institute National Institute of MaritimePort and Aviation TechnologyTokyoJapan Research Center for Space BRINBandungIndonesia

The effect of ionospheric delay on the ground-based augmentation system under normal conditions can be mitigated by determining the value of the nominal ionospheric gradient(σvig).The nominal ionospheric gradient is generally obtained from Continuously Operating Reference Stations data by using the spatial single-difference method(mixed-pair,station-pair,or satellite-pair)or the temporal single-difference method(time-step).The time-step method uses only a single receiver,but it still contains ionospheric temporal *** introduce a corrected time-step method using a fixed-ionospheric pierce point from the geostationary equatorial orbit satellite and test it through simulations based on the global ionospheric *** also investigate the effect of satellite paths on the corrected time-step method in the region of the equator,which tends to be in a more north–south direction and to have less coverage for the east–west ionospheric *** study also addresses the limitations of temporal variation correction coverage and recommends using only the correction from *** processes are developed under simulations because observational data are still difficult to *** findings demonstrate that the corrected time-step method yieldsσvig values consistent with other approaches.

关键词： ground-based augmentation system nominal ionospheric gradient time-step correction global ionospheric model

Long-term conservation tillage results in a more balanced soil microbiological activity and higher nutrient supply capacity

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

International Soil and Water Conservation Research 2023年第3期11卷 528-537页

作者： Priyo adi nugroho Katalin Juhos Nandor Prettl Balazs Madarasz Zsolt Kotroczo Department of Agro-Environmental Studies Institute of Environmental ScienceHungarian University of Agriculture and Life SciencesHungary Geographical Institute Research Centre for Astronomy and Earth SciencesBudapestHungary

Soil health depletion due to intensive tillage operations is a global issue in the agricultural *** tillage(CT)which involves non-inversion tillage and leaving~30%of the soil surface covered with crop residues,is a strategy designed to enhance soil ***,no comprehensive study to investigate the long-term effect of CT on soil biological activity and the soil nutrient supply has yet been widely carried *** and chemical soil properties were assessed at depths 0-5,10-15,and 20-25 cm depths after 18 years of CT and conventional tillage practice(PT).Various stages in the vegetative growth of maize were investigated in 2021 in *** findings indicated that tillage intensity,soil depth,and growth stages all significantly influenced soil enzyme activities and the concentration of soil *** soil disturbance resulted in a significantly larger concentration of soil carbon parameters(total organic carbon and labile carbon)in CT plots,where the activity ofβ-glucosidase and dehydrogenase(DHA)in the upper soil layer increased significantly(0.7-2.6 and 2.6-4.7 times,respectively)compared to *** high amount of organic matter and the greater resistance to erosion observed in CT also contributed to the higher concentration of available nutrients(NH_(4),NO_(3),Ca,K)and total P in the surface soil *** activity was highest in the mid-stage of vegetative growth and was positively correlated to the total P *** alterations in soil water content were clearly negatively corelated with the change in DHA and phosphatase ***,due to the more balanced environmental conditions,the decomposition of organic substances was more balanced and slower in CT than in *** implied that the mobilization of nutrients in the soil was more balanced as well,and that the nutrients were released *** enhancement of the soil nutrient-supplying capacity achieved by means of long-term conservation tillage provid

关键词： Dehydrogenase β-glucosidase Phosphatase Nutrient balance Mineralization

Franchise ownership redirection:real options perspective

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Financial Innovation 2016年第1期2卷 135-145页

作者： Lukito adi nugroho Advanced Mathematical Sciences Department Meiji University4-21-1 NakanoTokyoJapan

Background:For over 40 years,the franchise ownership redirection hypothesis has attracted the attention of many *** study,differing from previous ones,proposes an alternative approach for this hypothesis using a real options framework with the extension of agency ***:The real options model is built using the least square Monte Carlo method,where the franchisor’s decision to franchise is perceived as a deferred investment while maintaining the right of future ***:Tested using monte carlo simulation based hypothetical case,the model shows a different result from classical real options call *** is mainly due to franchise contractual arrangement,where royalty fee lower the threshold of acquisition cost in converting the franchise outlet to company ***:The aim of this study is to create an analytical framework that helps a franchisor decide whether or not toacquire and convert a franchise unit to a company-owned unit at a certain point in time,analyzing the choice as a deferment of *** franchisors that faces the opportunity to optimize profit by converting the franchise unit to a company-owned unit should acknowledge it as real options thus negotiate the terms with their franchisees.

关键词： Real options Franchise Agency theory Monte Carlo simulation

Zeolite A Synthesized from Geothermal Waste Using Conventional and Microwave Heating for the Hydrothermal Treatment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fluid Dynamics & Materials Processing 2021年第2期17卷 385-395页

作者： Sulardjaka Sulardjaka Sri nugroho Norman Iskandar Agus P.adi Deni F.Fitriyana Diponegoro University Semarang50275Indonesia Universitas Negeri Semarang GunungpatiSemarang50229Indonesia

Zeolite A has been successfully synthesized from geothermal waste with natrium aluminate and natrium silicate using conventional(C-H)and microwave heating(M-H)for the hydrothermal *** products obtained for different aging times have been characterized using X-Ray Diffraction(XRD),Fourier transformation infrared spectroscopy(FTIR),and scanning electron microscopy(SEM).It is shown that with the M-H process,zeolite can be formed at relatively low temperature(100°C)in a relatively short time(40 min).The crystallization of zeolite A has been found to be generally promoted by an increase of aging and synthesis time;however,it has also been observed that relative long aging times can transform it into *** A produced through the M-H process generally displays a smaller and more homogeneous crystal size with respect to that obtained with the C-H method.

关键词： Geothermal waste microwave-hydrothermal conventional-hydrothermal zeolite A

Kidney transplantation in Indonesia: An update

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Journal of Urology 2019年第4期6卷 305-311页

作者： Tommy Supit Eriawan Agung nugroho Ardy Santosa Moh adi Soedarso Nanda Daniswara Sofyan Rais Addin Department of General Surgery Faculty of Medicine Diponegoro UniversityDr.Kariadi General HospitalSemarangJawa TengahIndonesia Department of Urology Faculty of Medicine Diponegoro UniversityDr.Kariadi General HospitalSemarangJawa TengahIndonesia

Objective:Indonesia has overcome several barriers to the growth of kidney transplantation within the past ***,the procedure is increasingly performed in several centers across the *** there are limited publications on kidney transplantation from Indonesia,especially from centers outside *** study aims to give a brief overview on transplantation performed,discuss current efforts and progresses of transplantation in Indonesia and chiefly ***:Retrospective analysis of 20 transplant cases in Semarang during 2014e2018 was *** from other transplant centers was acquired through formal correspondences with 11 central teaching hospitals in Jakarta,Surabaya,Yogyakarta,Malang,Bali,Solo,Palembang,Aceh,Medan,Bandung,and ***:There were 629 recorded kidney transplantations performed in 12 centers,and we report on 245 cases with viable *** average age of kidney recipients were younger(35.4 years old)compared to the donors(41.3 years old).Approximately half of the kidneys were obtained from related donors(49.0%)and there was only one case of cadaveric *** three leading etiologies of end-stage renal disease were hypertension(37.4%),diabetes mellitus(26.1%),and autoimmune disease(11.3%).There is only one center that has performed more than 100 kidney transplants in ***:Indonesia has successfully overcome several major hurdles that had previously hindered the growth of *** improvement should concentrate on the development of integrated organ transplant infrastructure,decentralization of transplant professionals,establishment of National kidney transplant database and changing the Nation’s paradigm on cadaveric organ donor through public education.

关键词： Kidney transplantation End-stage renal disease Chronic kidney disease Indonesia Semarang Epidemiology Update

Retinal vasculature enhancement using independent component analysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Biomedical Science and Engineering 2009年第7期2卷 543-549页

作者： Ahmad Fadzil M. Hani Hanung adi nugroho 不详

Retinal vasculature is a network of vessels in the retinal layer. In ophthalmology, information of retinal vasculature in analyzing fundus images is important for early detection of diseases related to the retina, e.g. diabetic retinopathy. However, in fundus images the contrast between retinal vasculature and the background is very low. As a result, analyzing or visualizing tiny retinal vasculature is difficult. There-fore, enhancement of retinal vasculature in digital fundus image is important to provide better visualization of retinal blood vessels as well as to increase accuracy of retinal vasculature segmentation. Fluorescein angiogram overcomes this imaging problem but it is an invasive procedure that leads to other physiological problems. In this research work, the low contrast problem of retinal fundus images ob-tained from fundus camera is addressed. We develop a fundus image model based on probability distribution function of melanin, haemoglobin and macular pigment to represent melanin, retinal vasculature and macular region, respectively. We determine retinal pigments makeup, namely macular pigment, melanin and haemoglobin using independent component analysis. Independent component image due to haemoglobin obtained is used since it exhibits higher contrast retinal vasculature. Contrast of reti-nal vasculature from independent component image due to haemoglobin is compared to those from other enhancement methods. Results show that this approach outperforms other non-invasive enhancement methods, such as contrast stretching, histogram equalization and CLAHE and can be beneficial for retinal vasculature segmentation. Contrast enhancement factor up to 2.62 for a digital retinal fundus image model is achieved. This improvement in contrast reduces the need of applying contrasting agent on patients.

关键词： Contrast Enhancement Independent Comp- onent Analysis Medical Image Processing Retinal Fundus Image

The Role of Clay Mineral Composition on Silicified Coal Genesa Based on X-Ray Diffraction (XRD)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Geoscience and Environment Protection 2021年第7期9卷 192-208页

作者： Basuki Rahmad Gerhana Prasetya Sugeng Ediyanto Muchamad Ocky bayu nugroho Intan Permata Hatty Hariyadi Geological Engineering Department Faculty of Technology Mineral Universitas Pembangunan Nasional “Veteran” Yogyakarta Kota Yogyakarta Indonesia PT. Adaro Indonesia Jakarta Indonesia

The interesting concern in this study is that in the same outcrop it was found that the first coal seam (coal seam-D) contains silicified coal and the second coal seam (coal seam-E) does not contain silicified coal and how to find out the cause. In general, the characteristics of silicified coal seam-D are in the form of lenses; the distribution extends from a few meters to several tens of meters with a thickness of three to five centimeters and some are in nodules. Environmental conditions are the main factor in the formation of silicified coal where the acidity level of coal bearing sediment seam-D which is between 3.4 (roof sediment) to 4.2 (floor sediment) is higher than coal bearing sediment seam-E which has a pH of 5.4. This condition indicates that the coal bearing sediment seam-D environment is more acidic than coal seam-E. The results of XRD analysis show that the seam-D containing silicified coal has a composition of 47.47% kaolinite, 21.27% illite, 23.73% smectite and 17.54% mixed layer, while the seam-E which does not contain silicified coal has a composition of kaolinite 35.78%, illite 17.88%, smectite 21.59% and mixed layer 24.76%. Acidic environmental conditions (pH) and silica enrichment in clay minerals (kaolinite) in the roof sediments during sedimentation, accelerated the process of deposition of colloidal silica in the wood structure of coal seams into silicified coal.

关键词： Silicified Coal Roof Sediment pH Kaolinite Acid

Implementing Virtual Reality Environment for Bicycling in an Eco-Campus Application

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer Technology and Application 2011年第2期2卷 158-164页

作者： Riri Fitri Sari Anna Gianty Citra Parameswari Prima Dewi Purnamasari, Alfa Shefildi Manaf bayu Ananto Burhan adi Wicaksana Kalamullah Ramli Department of Electrical Engineering Faculty of Engineering University of Indonesia Kampus Baru UI Depok 16424 Indonesia

This paper reviews virtual reality interface, application and design concept in relation with our experience in implementing a virtual bicycling environment application of the University of Indonesia Green Eco-campus. The implementation of the Virtual Reality VR used 3D-Games Studio with Lite-C software. The authors also experiment with the use of a VR device, i. e. 3D E-Dimensional wireless goggle to improve the feel of presence for the user of our application. The authors created the original elements of UI campus environment, such as, buildings, trees, campus buses, cars, and bike tracks, as well as obstacle in the pathways into 3D virtual shape that resembles the real UI campus environment. The bicycle movement, camera perceptions, and object collision handling have also been implemented. Our application is subsequently tested by the users in terms of the general object condition, user’s respond to the virtual reality environment and the future development. Some result of implementing the same environment using Alice has also been shown.

关键词：虚拟现实环境应用程序自行车道生态校园绿色生态环境三维游戏校园环境印度尼西亚

The Effects of Cropping Methods on Growth, Crop Index and Yield Response to Water of Rice （Oryza sativa L.） in Rainfed Agriculture

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Agricultural Science and Technology(B) 2015年第6期5卷 376-382页

作者： bayu Dwi Apri nugroho Rizki Mafmkhah Department of Agricultural Engineering and Biosystem Faculty of Agricultural Technology Gadjah Mada University Yogyakarta55281 Indonesia