bluuebunny/crossref_metadata_2025 huggingface dataset:
Characterization of Anisotropic Geomechanical Properties of Australian Bowen Basin Coals Through Nanoindentation and Upscaling Approaches
Authors: Shi Zhang , Huang Yixiao , Flottman Thomas , Leonardi Christopher , Lu Mingyuan , Chen Zhongwei
Published: November 2023

Coal geomechanical properties are of importance in various applications, including drilling in coal seams, ensuring long-term borehole stability, and predicting the permeability evolution in coal seam gas reservoirs. However, coal is highly cleated and fragile. Obtaining standard drill cores for the laboratory test becomes exceptionally challenging. Also, the anisotropic characterizations of coal mechanical properties are often overlooked despite being essential in understanding directional drilling to increase gas production. In this study, nanoindentation tests were conducted to investigate the anisotropic nanomechanical properties of coal macerals and then the nano-scale data was used to predict the corresponding macroscopic mechanical properties. Overall, 900 indents were made on three types of coal polished surfaces perpendicular to the bedding plane, face, and butt cleats, respectively. The load-displacement curves obtained from the nanoindentation tests were used to calculate the elastic modulus and hardness. We then employed the dilute and Mori-Tanaka homogenization schemes to upscale the nano-scale results. To validate our findings, we compared our predicted values with the results obtained from direct laboratory measurements across different scales. According to the nanoindentation tests, the averaged elastic modulus is 5.89 GPa, 5.75 GPa, and 5.11 GPa, for the directions perpendicular to the bedding (Z), face cleats (Y), and butt cleats (X), respectively. Three coal macerals are identified. The elastic modulus of vitrinite is averaged as 4.55 GPa, 4.75 GPa, and 4.58 GPa for Z, Y, and X directions, respectively. For liptinite and inertinite, their elastic moduli are 4.35 GPa, 4.70 GPa, and 4.24 GPa, as well as 8.76 GPa, 7.80 GPa, and 6.51 GPa, respectively. It was observed that the elastic modulus of inertinite was anisotropic, with the measurement perpendicular to the bedding plane being greater than in the two directions parallel to the bedding plane. There was, however, no significant anisotropy identified for vitrinite and liptinite. This work provides direct measurements of the anisotropic mechanical properties of coal at the nano-scale, and establishes a correlation among the elastic modulus at different scales, especially at the nano-scale. By estimating the coal's mechanical properties from measurements on smaller samples, we provide an alternative approach to understanding the bulk anisotropic features of coals, which benefits various operations, especially directional drilling and permeability.
Mechanical Casing Perforation to Access Reservoir Isolated by Misaligned Casing in Surat Basin CSG Well
Authors: Tooms C. , Rajora A. , Oberhardt M. , Corbett R. , Sharma V.
Published: November 2023

Arrow Energy's current Surat Basin well design uses slotted casing and swellable packers to isolate interburden from productive coal seams to reduce the volume of produced solids entering the artificial lift system. On a few occasions, the casing string with swellable packers has been unable to be landed at the correct depth, resulting in slotted intervals that were misaligned with the coal seams.

In order to establish production from the cased-off coal seams, various scenarios and available technologies were evaluated. Three scenarios were considered: unperforated (leaving the well "as is"), perforated, and the plugging and abandonment of the existing wells and the drilling of new replacement wells. The perforation scenario incorporated the evaluation of different methods to gain access to the reservoir. From the economic analysis, the replacement wells scenario was determined to have the best long-term financial outcome for Arrow Energy, followed by the mechanical casing perforation methods. The results of the economic and technical analyses combined with the risks assessed with the replacement wells scenario indicated that perforation with the mechanical casing perforator tool would be the best solution. The decision was made to trial the mechanical casing perforator tool as a potential solution prior to considering replacement wells. Operational and safety factors resulted in the decision to convey the mechanical casing perforator tool on tubing with the workover rig.

One deviated well with misaligned slotted casing has subsequently been successfully perforated with this methodology, with several lessons learnt from the trial. This well then underwent a standard initial completion with an Electric Submersible Pump (ESP) artificial lift system installed. Start-up was completed on this well and an optimized well status has been reached. When optimized, this well is producing as per the adjusted gas rate forecast, with volumes comparable to other optimized wells on the same multi-well pad.

Costs of the mechanical casing perforation operation were recouped from this well within a week of start-up. The watch points for this well are negative impacts on expected artificial lift system run-life due to potentially higher solids production from the misaligned slotted sections.
Effective Steering of Long Horizontal Appraisal Wells in a Shale Gas Play - Case Study from the Beetaloo Sub-Basin
Authors: Nieto Manuel Felipe Cardozo , Wang Haifeng , Yang Liu , Kalukal Francis , Wang Chao , Zhang Li Li , Hibberson Chris , Van Luu Hoan
Published: November 2023

The Beetaloo Sub-basin is in the Northern Territory and is one of Australia's most promising onshore marine shale gas resources. How to develop these shale gas resources economically is still under investigation by many operators. Recently, Empire Energy Group Limited ("Empire") drilled two horizontal appraisal wells, Carpentaria-2H and Carpentaria-3H, with great success. In this paper, the authors share their experience whilst steering these two wells, including challenges and solutions.

The primary target of the two horizontal wells was the ~70 m thick B Shale of the Velkerri Formation, within the Amungee member of the Roper Group. Geosteering was required to place each well within a high-graded B Shale target window over a long horizontal length. Carpentaria-3H was the more challenging well due to its length coupled with several fault intersections with throw of magnitude proximal to the high-graded target window thickness and structural dips changing across faults.

To tackle these challenges, a rotary steerable system (RSS) with near-bit gamma ray (GR) was used for drilling the long horizontal sections. The target interval of the B shale has elevated uranium content and relatively low potassium and thorium contents. Therefore, a logging-while-drilling (LWD) tool with spectral GR sensors was selected to guide Geosteering. This tool also provided real-time azimuthal GR image around the borehole, which could help the geosteerer determine formation dip and identify faulting. Surface mudlogging provided chromatography and X-ray fluorescence spectroscopy on cuttings provided verification, albeit at a lagged time interval.

Utilizing these fit-for-purpose technologies, the operator first drilled the Carpentaria-2H successfully, placing the horizontal section 100% within the B shale for 1345m MD. One year after, the operator drilled the Carpentaria-3H well. Despite crossing six faults, the 3H well reached the total depth of 4460m achieving a 2632m horizontal section, with 2374m in the Velkerri B-Shale. The C-3H well holds the record of longest horizontal section drilled in the Beetaloo Sub-basin to-date.
Bisbenzimidazole salts and their in silico-in vitro inhibitory abilities on hCAI, hCAII, and AChE enzymes
Authors: Yılmaz Ülkü , Demir Yeliz , Tok Tuğba Taşkın , Gök Yetkin , Aktaş Aydın , Gülçin İlhami
Published: November 2023

New eight bisbenzimidazolium halides were prepared from alkyl halides and 4,4'-bis((benzimidazol-1-yl)methyl)-1,1'-biphenyl. The structures of benzimidazolyum salts were identified thanks to spectroscopic methods. Inhibitory activities of benzimidazole derivatives were measured against hCA I, hCA II and AChE enzymes. It was observed that all benzimidazolium halides have good inhibitory activities against enzymes. They showed highly potent inhibition effect on acetylcholinesterase (AChE) and carbonic anhydrases (hCAs) (Ki values are in the range of 15.66 ± 0.87 to 49.71 ± 10.11 nM, 14.62 ± 1.51 to 70.68 ± 2.67 nM, and 17.38 ± 2.81 to 37.94 ± 10.09nM for AChE, hCA I, and hCA II, respectively). The binding orientation of the synthesized bisbenzimidazole salts was evaluated by molecular docking studies, reflecting the importance of the p-methylbenzyl, m-methylbenzyl, p-nitrophenethyl and 3-(1,3-dioxoisoindolin-2-yl)methyl) groups in protein-ligand interaction. The docking results support the Ki values of the respective compounds in this study. Their interactions with the mentioned enzymes clearly demonstrate the structure-activity relationships against the different targets in three dimensions at atomic level.
Substance Use and Climate-Related Disasters among People Utilizing Syringe Exchange Services in Houston, Texas
Authors: Brinkley-Rubinstein Lauren , O'Toole Lillian , Cullins Zaire , McCauley Erin , Lao Jennifer , Gutierrez Carmen
Published: November 2023

Climate disasters are becoming more common. Certain subsections of the population may be more susceptible to the health harms of escalating weather events. While a large body of work has been developed on the impacts of natural disasters on physical health, less has been explored relevant to substance use. In the current study, we assessed how natural disasters impacted people who use drugs in Houston, Texas, an area that has been repeatedly impacted by many climate-change related events (e.g., floods, hurricanes). We found that there were changes in the macro-market and subsequent seller and drug using patterns. Lack of access to obtaining drugs during storms or disasters occurred often, and participants reported that there were various patterns of use during storms or disasters. Most participants expressed that regardless of the barriers presented by natural disaster, they would usually find a way to obtain substances when they wanted or needed them. Our findings have implications for bolstering the availability of substance use treatment and harm reduction services and developing plans relevant to access in the face of increasing weather disasters.
Development of Nomogram for Predicting Axillary Pathologic Complete Response after Neoadjuvant Therapy in Breast Cancer Patients without Distant Metastasis
Authors: Zhang Jian , Cao Hong-Ming , Wang Gao-Yuan , Nie Chang-Bo , Bai Shou-Min , Ma Shuang
Published: November 2023

(1) Background: For N+ breast cancer patients treated with neoadjuvant therapy, the response to the treatment, especially the probability of axillary pathological complete response (apCR), can guide the choice of subsequent surgical strategy.
(2) Method: 50 N+ breast cancer patients were treated with neoadjuvant therapy, with the response to neoadjuvant therapy guiding subsequent surgical modalities. Logistic regression was used to calculate the coefficients of the significant predictors for axillary pathologic complete response (apCR), and a nomogram was developed based on the logistic model and internally validated.
(3) Results: 4 variables were found to be related to the probability of apCR: pathological grade and molecular subtype (HER2+), neutrophil-to-lymphocyte ratio (NLR), and monocyte-to-lymphocyte ratio (MLR). The nomogram based predictive cooperating pathological features and hematological test results can be used to predict apCR in N+ breast cancer patients who had received neoadjuvant chemotherapy(NAC). The receiver operating characteristic (ROC) curve for the nomogram model is 0.929 [95% confidence interval (CI): 0.859–0.998], indicating a good discrimination.
(4) Conclusion: A comprehensive predictive model using clinical data is a useful tool to predict the probability of apCR in N+ breast cancer patients receiving NAC.
Feasibility of mobile health app-based home aerobic exercise for physical performance in young healthy adults
Authors: Nam Je Shik , Kim Hyun-Ah , Kwak Tae-Jin , Cho Kang Hee , Jung Il-Young , Moon Chang-Won
Published: November 2023

Background
Compared with fitness facilities or outdoor exercise, home-based exercise programs effectively improve physical performance in an indwelling community. However, a flexible, informal environment may decrease motivation and impair adherence to physical exercise. Mobile devices (e.g., smartphones, tablets, and smartwatch fitness trackers) for aerobic exercise and mobile applications provide real-time monitoring, immediate feedback, and encouragement to increase motivation and promote physical performance. We investigated the feasibility and effects of a mobile app-based home exercise program on body composition, muscular strength, and cardiopulmonary function.
Methods
Between February and May 2023, 20 participants who provided informed consent were randomly allocated to the intervention (mobile application with a tablet) and control groups, and they performed aerobic exercise using a stationary bicycle for at least 150 min per week for 6 weeks (≤ 30-minute exercise session, with 3-minute warm-up and 3-minute cool-down). Karvonen formula-based heartrate defined the weekly increase in exercise intensity. Outcome measures included body-composition parameters, isokinetic knee flexor and extensor strength tests, cardiopulmonary exercise test results, and rate of target HR achievement. Participants were at baseline and after the 6-week intervention.
Results
Unrelated personal events led 2 of 20 participants to drop out. The intervention and control groups had similar baseline characteristics. Compared with the control group, in the post-intervention isokinetic strength test, bilateral knee flexor and extensor power, and time to target HR achievement significantly increased each week in the intervention group.
Conclusions
Home-based exercise to achieve long-term cardiovascular fitness with portable electronic/mobile devices facilitates individualized exercise using real-time feedback to improve motivation and adherence.
Trial registration:
This study has been registered with crs.nih.go.kr (registration number, KCT 0008876) (16/10/2023).
The prognosis of Optical Coherence Tomography-Guided versus Intravascular Ultrasound-Guided Implantation of Drug-Eluting Stents: A Meta-Analysis from Randomized controlled trials
Authors: wang shen , Sun Shuaifeng , Wang Yue , Li Fadong , Wu Xiaofan
Published: November 2023

Objective
Some observational studies and a few meta-analyses have shown a similarity of optical coherence tomography (OCT) in guiding drug-eluting stent (DES) implantation compared with intravascular ultrasound (IVUS). However, a comparison of long-term outcomes between guidance OCT or IVUS from randomized controlled trials (RCTs) is lacking. This study aimed to compare the prognosis of IVUS vs. OCT in guiding stent implantation.
Methods
Randomized controlled trials (RCTs) related to compare long outcomes of IVUS versus OCT in guiding stent implantation from inception to 15 October 2023 were identified using PubMed, Cochrane Library, Medline, Web of Science and EMBASE databases. Two researchers independently screened articles, extracted data, and assessed the quality of each study according to Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. Data were aggregated for the primary outcome measure using the random-effects model as pooled risk ratio (RR). The primary clinical prognosis including major adverse cardiac events (MACEs), all-cause mortality, all-cause myocardial infarction, all revascularization, and stent thrombosis.
Results
Five RCTs (3,339 patients) were included (OCT guidance = 1,680; IVUS guidance = 1,659). There were similar results for all long-term outcomes between OCT and IVUS-guided DES implantation: major adverse cardiac events (relative risk (RR) = 0.96; 95% confidence interval (CI), 0.68–1.36; P = 0.82), all-cause mortality (RR = 1.00; 95% CI, 0.52–1.91; P = 1.00), all-cause myocardial infarction (RR = 0.81; 95% CI, 0.44–1.49; P = 0.50), all revascularization (RR = 1.02; 95% CI, 0.74–1.42; P = 0.88), and stent thrombosis (RR = 0.44; 95% CI, 0.10–1.97; P = 0.28).
Conclusions
This meta-analysis suggested no significant difference in prognosis between OCT-guided vs. IVUS-guided coronary stent implantation.
Gender differences in high school choices: do math and language skills play a role?
Authors: Contini Dalit , TOmmaso Maria Laura Di , Maccagnan Anna , Mendolia Silvia
Published: November 2023

This paper focuses on the gendered choice of high school in the Italian context, where children are tracked at age 14 and are free to choose the type of school, with no binding teacher recommendation or ability restriction. It is therefore a context in which preferences, however influenced by different factors, are freely expressed, without any institutional constraints imposed on the decision-making process. Previous literature has mainly analysed gendered educational choices by focusing on the field at later stages in life. The transition from lower secondary to upper secondary school is particularly relevant for children who do not go on to university and can help to understand gender segregation in low and middle-level occupations. We analyse the role of school performance in mathematics and Italian (teacher grades and standardized test scores), the position in the class ranking, the comparative advantage in one subject and find that, while school performance hardly explains the gender gap for the children with low educated parents, it explains part of the gender gap observed for children from more advantaged backgrounds.
The Ayounkon project: Visual impairment, eye diseases and unmet eye care needs in the Syrian refugee population and the hosting community in Lebanon
Authors: Abdelmassih Youssef , Makhoul Maxime , Issa Mohammad , Sukkarieh George , Cherfan Daniel , el-Khoury Sylvain
Published: November 2023

Aim:
To report on the distribution of eye diseases, aetiologies of severe visual impairment/blindness (SVI/BL) and unmet eye care needs of the Syrian refugee population and the Lebanese host community.
Methods:
This retrospective study analysed the data of patients that were examined during the Ayounkon project –an eye health care project offering medical and surgical treatment for Syrian refugees and Lebanese host community in the Bekaa Valley in Lebanon. The project took place in three different primary health care centres and involved cooperation between several NGOs and ophthalmologists working on a voluntary basis. Data was analysed for distribution of eye diseases and aetiologies responsible for monocular and binocular SVI/BL.
Results:
A total of 2067 patients were included, 677 were children <18 years. The most frequent pathologies were ocular allergy (10%), and cataract (7.4%). 158 patients (7.6%) were referred for surgery. Glasses were prescribed for 1103 patients (53.4%), of whom 242 (21.9%) were children of school age.
SVI/BL was found in 276 patients (13%). The condition was bilateral in 116 patients (42%). SVI/BL was significantly more frequent in the Syrian population than in the Lebanese (186 patients, 14.8% vs. 86 patients, 11.3%; p=0.04). The main causes for SVI/BL were cataract, keratoconus/corneal decompensation and amblyopia.
Conclusion:
The Syrian refugee population and the Lebanese host community have a high prevalence of ophthalmic pathologies and SVI/BL. Visual impairment is more prevalent in the refugee population. Our findings underscore the importance of targeted interventions and access to eye care services for these populations.
Damage to young pine trees due to growing conditions
Authors: Парамонов С.Г. , Грязькин А.В. , Смирнов А.П. , Семенова Е.И. , Чэн Т.
Published: November 2023

Представлены результаты единовременного обследования на 8 опытных участках молодняков сосны естественного происхождения и лесных культур на вырубках, под пологом материнского древостоя, а также на бывших сельскохозяйственных землях. Почвенные условия разных объектов объединяет супесчаный минералогический состав. Средний индекс жизнеспособности подроста сосны под пологом древостоев составляет 2,98-3,12, на бывших землях сельскохозяйственного назначения - 4,36-4,43. Под пологом древостоев практически отсутствуют экземпляры подроста сосны без повреждений либо дефектов роста, и здесь в наибольшей степени (до 70%) сосна повреждена биаторелловым раком (Biatorella difformis (Fries.). Наименьшее повреждение снежным шютте (Lopodermium seditiosum Mint.) выявлено у подроста на постагрогенных землях (до 7%). Вместе с тем на постагрогенных землях и вырубках выявлено наибольшее количество поврежденных лосем экземпляров, а также таких пороков, как пасынки и многоветвистость мутовки.

The results of a one-time survey on 8 experimental plots of young pine of natural origin and forest crops on fellings, under the canopy of the mother tree stand, as well as on former agricultural lands are presented. The soil conditions of different objects are united by a sandy loam mineralogical composition. The average index of viability of pine undergrowth under the canopy of stands is 2.98-3.12, on former agricultural lands - 4.36-4.43. Under the canopy of the stands, there are practically no specimens of pine undergrowth without damage or growth defects, and here the pine is most damaged (up to 70%) by biatorella cancer ( Biatorella difformis (Fries.)). The least damage to the snow schütte ( Lopodermium seditiosum Mint.) was detected in undergrowth on postagrogenic lands (up to 7%). At the same time, the largest number of moose-damaged specimens, as well as defects such as stepchildren and multibranch whorl, were found on postagrogenic lands and fellings.
The effect of the content of hydrolytic lignin on the performance of the finishing material based on plastic without resins
Authors: Артёмов А.В. , Вураско А.В. , Ершова А.С. , Бурындин В.Г.
Published: November 2023

Были получены образцы пластика без связующего (ПБС) на основе древесного наполнителя в различном соотношении с гидролизным лигнином. Образцы ПБС прессовались в герметичной пресс-форме под давлением 40 МПа и при температуре 180 С с последующим ее уменьшением без снятия давления до 40 С. Полученные образцы были испытаны на прочность при изгибе, на водопоглощение за 24 ч и 30 сут и на биостойкость по отношению к активному грунту за 21 сут. Также у образцов были определены приобретенные цветовые характеристики лицевой поверхности с целью оценки декоративных показателей. На основании полученных результатов испытаний на минимальные необходимые свойства для отделочных материалов (показатели прочности, водо- и биостойкости, декоративности) было установлено рациональное соотношение пресс-композиции с содержанием гидролизного лигнина в интервале 40÷60%. При данном соотношении достигаются следующие показатели материала: прочность при изгибе - 11,4-12,4 МПа; водопоглощение за 24 ч - 27%; водостойкость материала без начала деструктивных процессов до 21 сут; биостойкость при наличии постоянной влажной и патогенной среды - локальная без сквозной эрозии, цветовая окраска лицевой поверхности по шестнадцатизначной кодировке цвета соответствует цветам от нефритового до елового.

Samples of plastic without resins (PWR) based on wood filler in various ratios with hydrolyzed lignin were obtained. The PWR samples were pressed in a sealed mold at a pressure of 40 MPa and a temperature of 180 C, followed by its cooling without pressure relief to 40 C. The obtained samples were tested for bending strength, for water absorption in 24 hours and 30 days, and for biostability with respect to active soil in 21 days. Also, the acquired color characteristics of the front surface were determined in the samples in order to evaluate decorative indicators. Based on the obtained test results for the minimum necessary properties for finishing materials (strength, water and bio-resistance, decorative properties), a rational ratio of the press composition with the content of hydrolytic lignin in the range of 40-60% was established. With this ratio, the following indicators of the material are achieved: bending strength - 11.4-12.4 MPa; water absorption in 24 hours - 27%; water resistance of the material without the onset of destructive processes reaches up to 21 days; biostability in the presence of a constant moist and pathogenic environment is local without through erosion, the color coloration of the front surface by a sixteen-digit color coding corresponds to the colors from jade to spruce.
Temperature dependence of the coagulation action of Al2(SO4)3 on the aqueous dispersion of sulfate lignin
Authors: Лоренцсон А.В. , Геворкянц Т.Д. , Морева Ю.Л. , Чернобережский Ю.М.
Published: November 2023

В интервале температур 0 - 20 оС исследована устойчивость разбавленных (0,1 г/дм3) водных дисперсий сульфатного лигнина (СЛ) в широком диапазоне рН (2-12) в присутствии 10-4 М Al2(SO4)3. Обнаружена экстремальная зависимость устойчивости от температуры с минимумом в области 10 оС. При всех температурах максимальное осаждение СЛ наблюдается в интервале рН 4 -6. Высказано предположение, что в исследованном диапазоне температур наблюдаемый эффект обусловлен изменением структуры граничных слоев воды, окружающих молекулы СЛ, и морфологии образующихся агрегатов СЛ, оказывающих влияние на скорость их осаждения.

The stability of dilute (0.1 g/dm3) aqueous dispersions of sulfate lignin (SL) in a wide pH range (2-12) in the presence of 10-4 M Al2(SO4)3 was studied in the temperature range of 0-20 C. An extreme dependence of stability on temperature with a minimum in the region of 10 C was found. At all temperatures, the maximum deposition of SL is observed in the pH range of 4-6. It is suggested that in the studied temperature range, the observed effect is due to a change in the structure of the boundary layers of water surrounding the SL molecules and the morphology of the formed SL aggregates, which affect the rate of their sedimentation.
On the water resources tax standard and tax administration mode for urban residents in China
Authors: Wu Zheng , Tian Guiliang , Xia Qing , Li Jiawen
Published: November 2023

Levying water resources tax represents the exploration and innovation of paid use system of water resources in China. Due to the actual situation in China, the formulation of the water resources tax standard should fully reflect the value of water resources. Therefore, we use the fuzzy comprehensive evaluation model to evaluate the water resources value in China, explore the spatial distribution of water resources value, and calculate the tax standard for urban residents. The results show that China's spatial distribution of water resources value demonstrates a pattern of ‘high in the north and low in the south’. There is a significant gap between the calculated results and the existing water resources tax standard, which fails to reflect the water resources value. This gap makes it a challenging task to generate a water-saving incentive effect. In addition, we also discuss the collection and management mode of water resources tax for urban residents and the dynamic adjustment basis for the formulation of water resources tax standards with people's livelihood issues taken into consideration. These research results will provide concrete theoretical support and policy reference for policy-makers seeking to improve water resources tax reform policies.
Pemetaan Sebaran Hujan Rancangan Pada Berbagai Kala Ulang Menggunakan Metode Interpolasi Spasial di Sub DAS Brantas Hulu
Authors: Al Farra I'tibar M  , Donny Harisuseso  , Jadfan Sidqi Fidari
Published: November 2023

Sub DAS Brantas Hulu ini berperan penting dalam kualitas ketersediaan air di Jawa Timur. Namun perubahan iklim mengakibatkan Sub DAS Brantas Hulu ini sering terjadi bencana alam seperti banjir bandang di Kota Batu. Oleh sebab itu diperlukan peta isohyet yang mudah dipahami guna mempersingkat proses dalam mendapatkan hujan rancangan untuk mempermudah perencanaan bangunan air. Pada studi ini dilakukan perhitungan hujan rancangan dengan kala ulang 2, 5, 10, dan 25 tahun kemudian diplot dalam bentuk peta isohyet. 18 stasiun hujan yang telah didapatkan data curah hujan hariannya dari tahun 2002-2021 dilakukan analisa uji terlebih dahulu. Setelah itu melakukan perhitungan hujan rancangan berbagai kala ulang. Hasil uji tersebut menghasilkan metode Log Normal yang lebih cocok untuk dipakai dalam perhitungan selanjutnya. Penggambaran hujan rancangan peta isohyet dengan IDW, Kriging, dan Spline menghasilkan kesimpulan bahwa IDW dan Spline menghasilkan gambar yang lebih halus daripada Kriging. Dan setelah dilakukan analisa perbandingan dengan RMSE, NSE, dan Koefisien Korelasi menunjukkan metode IDW yang lebih cocok digunakan daripada metode lainnya.
Some issues of surveying floating berths of yacht marinas
Authors: Garibin P. A. , Egorov S. V. , Butsanets A. A.
Published: November 2023

Over the past 20 years, in Russia the growth of small-sized fleet, which is self-propelled watercraft with a length of 2 to 24 m, intended for sports, recreation, sailing trips and cruises, is noted. The increase in the number of vessels, in turn, contributes to the construction and commissioning of small-sized fleet anchorages. The approved terminology relating to yacht infrastructure is considered and its problems are discussed. A generalized diagram of the yacht port composition is proposed. The object of this study is water transport, in particular the location of small-sized fleet. The purpose of this study is to identify and formulate problems that may be encountered during the inspection and operation of hydraulic structures containing floating pontoons intended for mooring small-sized fleets using the example of a specific yacht port. The use of the principles embedded in ESG technology as one of the ways aimed at harmonizing regulations in the creation and operation of yacht marinas is proposed. As part of the ongoing survey of the yacht port, the berth structures of the yacht port were decomposed element by element and workable and limiting indicators of the pontoon berths elements condition were proposed in tabular form. These indicators are not exhaustive and must be adjusted for the specific object of inspection, taking into account the requirements of the Customer, regulations and the design of the hydraulic structure. In conclusion, a number of questions for further research are formulated. It is concluded that an adequate assessment of the technical condition of floating berths based on the results of a visual inspection is possible with the proper organization of an expert service in combination with continuous deformation monitoring and timely repairs carried out by the operating organization.
Assessing the results of work on strengthening the soils of the foundation of lock № 5 of the Volga-Don shipping canal and proposals for stabilizing the chamber position
Authors: Morgunov K. P.
Published: November 2023

The results of work to strengthen the soil foundation of the chamber of lock № 5 of the Volga-Don Shipping Canal, carried out in 2016–2017, are analyzed. The need to carry out work to strengthen the soil was caused by an increase in the intensity of sedimentation of the central sections of the lock chamber, which began in 2005. To stabilize the chamber position, the technology of two-component jet grouting is implemented. This technology assumes the formation of several longitudinal soil-cement walls in the soils of the lock chamber base, which would transfer the load from the weight of the chamber to the harder clay soils of the water-resistant layer. However, as a result of the work performed, the precipitation intensity has increased. Engineering-geological, hydrological and geophysical studies conducted in 2018–2020 recorded the absence of formed soil-cement elements in the soils of the chamber base. An analysis of the soil samples characteristics taken from the chamber base has showed that a layer of soils of 10–12 m thickness is composed of loess rocks, below which water-resistant clayey rocks lie. Initially, there were several confined and non-confined aquifers in the soils of the lock base, and the creation of a hydroelectric complex and the formation of a level difference between the upper and lower pools led to the formation of a filtration flow with a significant pressure gradient at the base of the chamber. An analysis of the properties and structure of loess soils has showed their predisposition to subsidence, transition to a floating state and liquefaction with an increase in water content. Under the conditions of weak water-saturated loess soils, the supply of a cement mixture into them under significant pressure did not lead to the formation of soil-cement elements. Thus, in accordance with the current regulatory documents, the technical condition of the gateway is defined as pre-emergency, and the security level is defined as unsatisfactory. Methods for reducing the intensity of the chamber sedimentation such as cutting through the loess layer with piles, physical and chemical strengthening of soils and water protection of the massif at the base of the chamber are considered and evaluated.
Mathematical modeling of robust automatic control system of magnetic levitation with uncertain parameters
Authors: Korobeynikov A. G. , Nyrkov A. P.
Published: November 2023

The topic of the research is the development of automated control systems for real processes, which must satisfy various requirements, for example, resistance to unmodeled dynamics (robust stability), as well as meet the required quality of transient processes that arise in the case of external disturbances of various natures. In this regard, there is a need to create appropriate mathematical models for the control of non-stationary objects, the model of which includes uncertain parameters. The problem of developing and studying a mathematical model for controlling the process of electrodynamic magnetic levitation, the main problem of which is dynamic stability, is considered. It is noted that systems using the effect of magnetic levitation are widely used, for example, in shipbuilding, in elements of ship mechanisms, instrument making, as well as in the transportation of various cargoes. The relevance of the work related to the need to develop such automatic control systems that can suppress the emerging oscillatory motion of levitating bodies is substantiated. The initial mathematical model of the magnetic levitation control process, which has uncertain coefficients in differential equations and is nonlinear, is considered. To “hang” at a given (working) point of a levitating body, it is enough to create a mathematical control model in the vicinity of this point based on the linearization of the original mathematical model. A PID-based controller and feedback are added to the resulting model. The four controller coefficients are adjusted using special algorithms, taking into account the requirements for the robustness of the control system. Numerical experiments are carried out to analyze the behavior of the control system depending on the magnitude of the parameter uncertainty. Based on the analysis performed, a conclusion about the robustness of the developed control system for the object under consideration is made. The results of the study are presented in graphical form. The MATLAB system is used as a toolkit.
Calculating a collision avoidance maneuver for two unmanned ships by minimizing a cost function in MATLAB
Authors: Tripolets O. Y.
Published: November 2023

An approach to the problem of collision avoidance of two unmanned vessels in certain area based on cost function minimization is presented in the paper. A script written in the MATLAB computational environment that calculates the optimal maneuver to prevent a collision is described. The cost function in this study is defined as the square of the difference between the safe distance and the Closest Point of Approach, and in order to find the optimal maneuver, it needs to be minimized, for which the fmincon (a MATLAB optimization function) is used in this code. The calculation of collision avoidance maneuvers is made “ from the perspective” of the VTS: it’s optimized for two vessels and allows the vessels to pass each other at a specified distance. The script, taking as input a matrix with data on pairs of approaching vessels (their x and y coordinates, speeds, and courses), by minimizing the cost function, calculates the optimal change in speeds and/or courses for two vessels, allowing them to pass each other at a safe distance. To verify the functionality of the script, a successful simulation is carried out in MATLAB. Several examples of its operation are given. These are situations where the closest point of approach (CPA) is grea-ter than safe one; situations where the CPA is less than safe distance, but the time to CPA is greater than safe time; and situations of dangerous convergence. The calculation results are illustrated with MATLAB graphs. The code of the script described in this paper can be further refined to work in conjunction with other algorithms, and it can also be used to create training datasets for training neural networks to predict safe maneuvers to prevent collisions of unmanned vessels at sea. In this study, the influence of wind and current is not considered, and the COLREGs‑72 is not also taken in consideration. Vessels can maneuver both to port and starboard, as well as reduce speed regardless of the type of approach situation.
Research on Strategies for the Healthy Development of Teenagers’ Physical Fitness under the Background of Integrating Sports and Education
Authors: Ni Jialu
Published: November 2023

The issuance and implementation of the “Healthy China 2030” Plan Outline has pointed out the direction and provided guiding ideology for China to gradually become a sports powerhouse. Youth are the fresh troops of the country, the main force and new force for achieving the great rejuvenation of the Chinese nation, and shoulder the hope of the country and the nation. The physical health of teenagers is the top priority of school sports work, and the importance of improving the health level of teenagers cannot be ignored. This article uses the methods of literature review and logical analysis to discuss the significance of the healthy development of adolescents, the current situation of foreign youth physical education, and the reform of school physical education models. The aim is to analyze the current difficulties in the development of youth physical education and propose strategies to improve the physical health of adolescents.
The influence of internal factors on micro and small enterprises performance: evidence from Tanzanian agri-food processors
Authors: Pascoe Pulkeria , de Barcellos Marcia Dutra , De Steur Hans , Schouteten Joachim , Tundui Hawa P. , Gellynck Xavier
Published: November 2023

Building upon resource-based view (RBV) theory, this cross-sectional study employed binary logistic regression to examine the influence of firm-level factors on the performance of 435 Tanzanian micro and small agri-food processing firms. The results of the study show that intangible resources, age (enterprise, manager), and management practices (target setting, working capital management, and performance monitoring) have a significant influence on firm performance. Firm size, tangible resources, and managers’ education level were not significant predictors of firm performance. The findings confirmed the RBV argument that intangible resources contribute more to the variation in firm performance compared to tangible resources. This study adds to the limited research on the combined effect of firm-specific characteristics, firm resources, managerial characteristics, and selected management practices on the performance of micro and small firms in emerging economies. The findings will help managers to identify success factors that are significant for better performance and will support policymakers to design strategies that can effectively contribute to the development of micro and small enterprises in the agri-food subsector.
Unraveling agricultural cooperatives’ performance measurement: a literature review
Authors: Martínez-López Irene , Fernández-Barcala Marta , González-Díaz Manuel
Published: November 2023

Cooperatives are a widely prevalent organizational form in the agrifood sector that have been extensively examined in the literature. The primary objective of this literature review is to evaluate approaches taken in studying the performance of these organizations, with a specific focus on whether these analyses have duly recognized the multifaceted nature of cooperatives, characterized by having multiple objectives. Second, the review examines research comparing cooperatives with other types of organizations to ascertain whether, despite operating in the same markets, such analyses have acknowledged that these organizations pursue vastly different objectives. Finally, this literature review also ascertains whether studies have considered the influence of organizational innovations (e.g. allowing capitalist investors or share transferability) on cooperatives’ performance. Correctly approximating how to measure the performance of agrifood cooperatives is critical to understanding their success and evolution and, significantly, whether they benefit from innovations in property rights and governance.
Dynamics of Efficiency and Productivity in the Greek Hospital Sector
Authors: Yfantopoulos John , Constantopoulos Athanassios , Chantzaras Athanasios
Published: November 2023

The objective of this study was to explore the dynamics of efficiency
and productivity of Greek public hospitals during the crisis, as well as
to review the effect of implemented policies on hospital efficiency
before and the implementation of the claw-back for hospital
pharmaceutical expenditure. We implemented Data Envelopment Analysis and
decomposed the Malmquist productivity index (MPI) to investigate the
fluctuations of the Greek public hospital productivity frontier and
therefore their technical efficiency between 2009 and 2019. The MPI
components allowed us to capture the frontier shift, as well as pure
efficiency changes and scale efficiency changes. Through the period
2009-2019 hospital inputs were reduced drastically. Doctors were reduced
by 54% while beds were reduced by 15%. Hospital expenditure was
decreasing between 2009 and 2015 but increased by 23% since due to
fixed hospital budgets and the “claw-back”. Moreover, output seems to
have increased. Patient discharges increased by 14% while diagnostic
procedures were reduced by 10% between 2009 and 2016 but have been
continuously rising since. Nonetheless, under variable returns to scale
(VRS) average hospital efficiency was stable (~75%) for
most of the period under study while declining since 2016. Policymakers
in Greece have always chosen to implement cost- or input-oriented
policies, instead of opting to improve outputs and quality of services.
Our analysis indicated that fixed-budget-oriented reforms have impacted
hospital efficiency negatively by creating a counterincentive to
adopting best practices and improving hospital efficiency.
Highlights Technical Efficiency under CRS was stable in Greece
(0.70) over the period 2012-2016, and declined to 0.51 in 2019. Hospital
Fixed Budget reforms had a negative impact on hospital efficiency.
During the economic crisis 2009-2019 hospital inputs were reduced
drastically Memorandum Policies introduced by Troika focused exclusively
in reducing cost and not improving efficiency.
Variability on Seed Yield and Related Agronomic Traits in Mesoamerican Common Bean (Phaseolus vulgaris L.) Genotypes under Contrasting Environments at South Eastern Ethiopia
Authors: Yimam Kedir , Mekonnen Fikru , Amsalu Berhanu
Published: November 2023

The experiment was conducted during July-November, 2022 at Melkassa and Kulumsa Agricultural Research Center main station under rain fed condition to assess the extent of genetic variability and to identify potential candidate genotypes.  A total of 64 small seeded common bean genotypes were evaluated for 18 quantitative traits using 8*8 triple lattice design. The analysis of variance showed that there was highly significant (p<0.01) difference among genotypes for all studied traits at both individual locations. The genotypes variation for seed yield was ranged from 1685.09 kg ha-1 to 4499 kg ha-1 at Melkassa and from 1369.76 kg ha-1 to 4848.38 kg ha-1 at Kulumsa. High PCV and GCV were recorded for total number of seeds per plant, number of fertile pods and total number of pods per plant in both locations. Moderate to high value of GCV and broad sense heritability coupled with high GAM were obtained for seed per plant, dry pod yield per plant, fertile pods per plant, seed weight per plant, hundred seed weight and seed yield per hectare in both locations; indicating the importance of those traits in yield improvement of small seeded common bean. G-39, G-27, G-58, G-35, G-29, G-18, G-8, G-61, G-37 and G-33 showed yield advantage from 49% to 88.9% at Melkassa and G-33, G-8, G-4, G-12, G-58, G-11, G-45, G-13, G-36 and G-30 from 16% to 36%  at kulumsa  over the best standard check G-64. The existed variations implied the possiblity for further improvement of seed yield and atributing traits through utlizing selected potential genotypes and targeted hybridization schemes in breeding programs.
BIVARIATE MAPPING BASED ON STUDENTS SPATIAL PREFERENCES IN THE SELECTION OF STUDENTS DORMITORY IN BANDAR LAMPUNG CITY
Authors: Oktaviani Rachmawati Fitri , Ghazali Mochamad Firman , Armijon Armijon
Published: November 2023

Boarding houses or better known as boarding houses are one of the choices of residence for overseas students from outside the island or outside the city who are studying at a university. Most students who choose a boarding house as a place to live, consider cost savings and flexible rental times. The need for boarding houses is very necessary for students. The purpose of this study is to determine the strategic location of the boarding house to be inhabited based on its main preferences. In this study, the data collection technique was in the form of distributing questionnaires, in which the distribution of this questionnaire was allowed to fill in unila students. And this research uses Geoda to generate LISA maps and uses Qgis to generate bivariate maps. The results of this study are that Kampung Baru and Kampung Baru Raya are the places where most students choose boarding houses based on the distance factor and also the rental price factor for boarding houses per year. There are 25 students who choose the location of the boarding house with the campus and the price is relatively cheaper
The Effect Of Adding Carboxy Methyl Cellulose (Cmc) On The Characteristics Of Orange Sweet Potato Jam
Authors: Kholizah Winda , Holinesti Rahmi , Gusnita Wiwik , Mustika Sari
Published: November 2023

This Study aims to analyze the effect of addition Carboxy Methyl Cellulose (CMC) as much as 0%, 0.5%, 1%, 1.5% and 2% on the quality of color, aroma, soft texture, easy to spread texture and taste of orange sweet potato jam. This type of research is a pure experiment using a Completely Randomized Design method consisting of 5 treatments and 3 repetitions. To analyze the quality of orange sweet potato jam, an organoleptic test was carried out involving 3 expert panelists. The data obtained was then tabulated and continued with ANOVA. If F count > F table then proceed with the Duncan test. The results of this research show that the addition of CMC has an effect on the quality of the soft texture and the texture is easy to spread. Meanwhile, the quality of color, aroma and taste has no effect. The results of data analysis obtained the highest overall achievement scores, namely color 3.67 (2%), aroma 3.67 (2%), easy to spread texture 4.00 (2%), soft texture 4.00 (2%), and taste 4.00 (2%). The best quality test results for orange sweet potato jam with the addition of CMC were in treatment X4 with the addition of 2% CMC.