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Ferly Indra Putra; Kiagus Ahmad Roni; Sri Martini

International Journal of Information Engineering and Science 2025 Asosiasi Riset Teknik Elektro dan Infomatika Indonesia

Clay soil stabilization is a crucial process to enhance the soil's bearing capacity and stability, making it more suitable for construction purposes. Stabilizing clay soils improves their mechanical properties, reduces swelling, and increases their load-bearing capacity, which is essential for the foundation of various structures. This study aims to investigate the effect of lime (CaO) addition and curing time on the physical properties of clay soil, particularly focusing on unconfined compressive strength (qu) and overall soil stability. The experimental methodology involved applying different percentages of lime content (ranging from 3% to 7%) and varying curing times (7, 14, and 28 days). The soil samples were tested for their unconfined compressive strength after each combination of lime content and curing duration. The results indicated that the addition of 5% lime (CaO) and curing for 14 days led to a significant improvement in the unconfined compressive strength by 153.3%, compared to the untreated clay soil. Furthermore, increasing the curing time beyond 14 days did not show substantial improvements in strength, suggesting that 14 days is the optimal curing period for this combination. The study also highlighted that the lime treatment not only enhanced the mechanical properties but also reduced the plasticity of the clay, making it more stable and easier to handle during construction. Based on these findings, it can be concluded that the appropriate combination of lime content and curing time plays a significant role in improving the stability of clay soils. This research provides valuable insights into optimizing soil stabilization techniques, offering an effective solution for enhancing soil properties for engineering applications

Yuni Astuti; Erni Suprapti; Tuti Anggarawati

Jurnal Pelaksanaan Pengabdian Bergerak bersama Masyarakat 2025 Asosiasi Riset Ilmu Kesehatan Indonesia

The postpartum period, which begins with the delivery of the placenta and ends when the reproductive organs return to their pre-pregnancy state, lasts approximately 6-8 weeks. During this period, many mothers face challenges related to breast milk production, resulting in insufficient or absent milk flow. This condition, if untreated, can hinder the breastfeeding process and affect both maternal and infant health. To address these challenges, several interventions such as warm compresses and oxytocin massage have been explored. The aim of this study was to assess the effectiveness of these two methods in improving breast milk flow among postpartum mothers. A quasi-experimental design was employed, utilizing a non-equivalent control group with pre-test and post-test measurements. The study targeted postpartum mothers who were experiencing difficulties with breast milk production. Purposive sampling was applied to select participants who met the inclusion criteria. The results showed significant differences between the effects of warm compresses and oxytocin massage on postpartum breast milk flow, with a p-value of 0.002 (<0.05), indicating that both methods positively influenced milk production. However, it was found that oxytocin massage had a more pronounced effect on milk flow compared to warm compresses. These findings suggest that oxytocin massage may be a more effective intervention for enhancing breast milk production in postpartum mothers, thus providing valuable information for healthcare professionals aiming to support new mothers in the breastfeeding process. The study also highlighted the importance of personalized care based on individual needs. Further research is recommended to investigate the long-term impact of these interventions and their broader application in various postpartum care settings. Additionally, exploring other complementary approaches could offer a more comprehensive strategy for managing breastfeeding difficulties in the postpartum period.

Diah Sarasanty; Tri Asmorowati, Erna

Jurnal Riset Rumpun Ilmu Teknik 2025 Pusat riset dan Inovasi Nasional

One of the impacts of the growth of activities in the transportation sector is the disposal of rubber tire waste. The increasing number of motorized vehicles in society has caused an increase in tire waste. Especially in developing countries, the use of plastic bottles has become an inevitable and unavoidable necessity for society. Inadequate waste management and handling causes negative impacts on the environment, such as hazards to human health, to animal life, soil, water, and air pollution. The purpose of this study was to reduce environmental pollution by testing the compressive strength of concrete made with a mixture of waste. Experiments were conducted in the laboratory with concrete cylinder test objects with a diameter of 150 mm and a height of 300 mm. The proportion of waste mixture, Polyethylene Terephthalate (PET), Rubber Powder, Waste Metalized Film Food Packaging (WMFFP) to fine aggregate was 0%, 5%, and 10%, each variation. The test results showed a compressive strength of 17.62 MPa, 15.29 MPa, and 14.83 MPa at the percentage of waste mixture. From this data, it can be concluded that waste materials can be used as a substitute for sand in concrete.

Ummu Kalsum Basman; Irma Ridhayani; Sainuddin Sainuddin; Abdi Manaf; Apriansyah Apriansyah +1 more

Jurnal Sipil Terapan 2025 Fakultas Teknik Universitas Cenderawasih

Rice husk ash (RHA) is an agricultural waste rich in silica with potential as a partial cement substitute in mortar to support sustainable construction. This study evaluates the effect of varying RHA content on the compressive strength and porosity of mortar at 28 and 240 days of age. Mortar was prepared with RHA substitutions of 0%, 10%, 20%, and 30% by cement weight. Compressive strength was tested according to SK SNI 03-2834-2000, while porosity testing followed ASTM C642 standard. The results showed that 20% RHA substitution provided high compressive strength with acceptable porosity. In contrast, 30% RHA significantly increased porosity and sharply reduced compressive strength. These findings suggest that using RHA in the range of 10–20% can improve material efficiency without compromising mechanical performance. The study supports the development of environmentally friendly construction materials through the optimal use of agricultural waste.

Bambang Kurnia; Zulfan Zulfan; Joharsah Joharsah

Jurnal Riset Rumpun Ilmu Teknik 2025 Pusat riset dan Inovasi Nasional

Natural gas is an essential industrial fluid, and its distribution requires a pipeline system that is safe and leak-free. Leakage in natural gas pipelines remains a major concern, as it reduces public confidence in using gas for household purposes. Therefore, testing is conducted before the pipeline network is operated. One commonly used method to detect leaks is the Pneumatic Test, which evaluates the strength and integrity of pipes and their joints according to standards for polyethylene natural gas pipelines. This test uses compressed air supplied by a compressor, with pressure and temperature measured at the inlet pipe using a pressure gauge. The study found no pressure changes or leakage throughout the test. The calculated holding time required for the pneumatic procedure was 1 hour, 26 minutes, and 8 seconds. Non-Destructive Testing (NDT) results showed that: (a) at 50% of test pressure (approximately 10 bar), the pipe held for 15 minutes with no pressure drop; (b) at 75% (around 15 bar), pressure remained stable for 15 minutes; and (c) at 100% (20 bar), pressure was maintained for 75 minutes without loss. Welding was performed using Nikko Steel electrodes (2 mm × 300 mm, 50–80 A), supported by proper safety gear and tools, and a Riland welding machine with a 400-A capacity.

Ni Putu Regita Yunika Arnidya; Ketut Lisnawati; Ni Made Nopita Wati; Ni Ketut Mirayanti

Jurnal Kesehatan Medika Udayana 2025 Sekolah Tinggi Ilmu Kesehatan Kesdam IX/Udayana

Background: Dysmenorrhea is often experienced by women, the impact of untreated dysmenorrhea can interfere with daily activities. Purpose: The purpose of this study was to determine the effect of giving warm compresses to the abdomen on dysmenorrhea pain. Method: The quasi-experimental research method with the Pretest-Postest Nonequivalent Control Group Design. The population in this study were all female students at SMP Negeri 10 Denpasar totaling 547 students with a purposive sampling technique using the slovin formula. Result: The results of the Wilcoxon test on the pretest-posttest of the treatment group obtained a value of P = 0.0003 <0.05, meaning that there was a difference in the dysmenorrhea pain score before and after being given warm compresses to the abdomen and health education in the treatment group. The results of the next Wilcoxon test on the pretest-posttest of the control group obtained a value of P = 0.066> 0.05, meaning that there was no difference before and after health education in the control group. The results of the Man Whitney test on dysmenorrhea pain scores after being given Warm Compress Abdomen and Health Education in the Treatment and Control Groups obtained P = 0.000 <0.05 indicating that there is an effect of Warm Compress Abdomen and Health Education on dysmenorrhea pain. Conclusion: Warm abdominal compress therapy and health education are effective methods to reduce dysmenorrhea pain in adolescent girls. It is recommended that adolescent girls can apply warm compresses as an effort to reduce menstrual pain (dysmenorrhea) with complementary therapy both in the school environment and at home.

Yuni Astuti; Erni Suprapti; Tuti Anggarawati

Jurnal ilmu Kesehatan Umum 2025 Asosiasi Riset Ilmu Kesehatan Indonesia

The postpartum period, which begins with the delivery of the placenta and ends when the reproductive organs return to their pre-pregnancy state, lasts approximately 6-8 weeks. During this period, many mothers face challenges related to breast milk production, resulting in insufficient or absent milk flow. This condition, if untreated, can hinder the breastfeeding process and affect both maternal and infant health. To address these challenges, several interventions such as warm compresses and oxytocin massage have been explored. The aim of this study was to assess the effectiveness of these two methods in improving breast milk flow among postpartum mothers. A quasi-experimental design was employed, utilizing a non-equivalent control group with pre-test and post-test measurements. The study targeted postpartum mothers who were experiencing difficulties with breast milk production. Purposive sampling was applied to select participants who met the inclusion criteria. The results showed significant differences between the effects of warm compresses and oxytocin massage on postpartum breast milk flow, with a p-value of 0.002 (<0.05), indicating that both methods positively influenced milk production. However, it was found that oxytocin massage had a more pronounced effect on milk flow compared to warm compresses. These findings suggest that oxytocin massage may be a more effective intervention for enhancing breast milk production in postpartum mothers, thus providing valuable information for healthcare professionals aiming to support new mothers in the breastfeeding process. The study also highlighted the importance of personalized care based on individual needs. Further research is recommended to investigate the long-term impact of these interventions and their broader application in various postpartum care settings. Additionally, exploring other complementary approaches could offer a more comprehensive strategy for managing breastfeeding difficulties in the postpartum period.

Kholifatur Rizqiyah; Ainul Yaqin Salam; Alwin Widhiyanto

Jurnal Mahasiswa Ilmu Kesehatan 2025 STIKes Ibnu Sina Ajibarang

Gout is a condition where high levels of uric acid in the blood that causes pain, and pain in the joints. One of the measures to lower joint pain is non- pharmacologically with ergonomic Gymnastics and warm compresses of lemongrass decoction. The purpose of this study is to analyze the effectiveness of ergonomic gymnastics and warm compresses of lemongrass decoction on the scale of joint pain in patients with gout in Alassumur lor village. This type of research was quasi-experimental with cross over group design approach. A population was 38 people selected by purposive sampling technique obtained 34 respondents who meet the inclusion requirements. This research used the numeric pain scale (NRS) observation sheet Instrument. The normality of the data had been tested with Kolmogorov-smirnov. The results of the study obtained ergonomic gymnastics pain scale period I pre-test was 6.94 and post-test was 2.94, stew period II pre-test was 5.18 post-test was was 2.59. In the warm compress group lemongrass stew period I pre-test was 3.18, post-test 1.82, period II pre-test was 3.76, post-test was 1.94. The results of data analysis obtained the value of pV 0.000 with a significant level of p value <a = 0.005, the value of Z prepost period I ergonomic exercise -3.695, warm compress of lemongrass stew -3.676, in period II ergonomic exercise -3.580 and warm compress lemongrass stew -3.531, so that it can be stated that ergonomic exercise is more effective to decrease the joint pain scale in patients with gout in Alassumur lor village. Ergonomic Gymnastics turns out to be more effective to reduce joint pain in gout and is expected to be one of the alternative interventions to reduce joint pain in people with gout.      

Rahmat Rahman; Albertus Juvensius Pontus; Agus Winarno

Globe: Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan 2025 Asosiasi Riset Ilmu Teknik Indonesia

Mining with an open pit system is carried out by excavating and removing the overburden to obtain coal. However, before mining, it is important to obtain geotechnical data information. As well as the lithology of the rocks below the surface, it is necessary to carry out geotechnical drilling (full coring). This study can determine the value of slope geometry safety factors and plan safe slope geometry, both individual slopes and overall slopes. Therefore, this was done to determine the influence of GSI geotechnical parameters on the value of static and dynamic slope safety factors. The method used in determining the safety factor and the probability of an avalanche is the Morgenstern-Price boundary equilibrium method with the Generalized Hoek-Brown collapse criterion in static and dynamic slope conditions. The input parameters used in the analysis were natural density, compressive strength value (UCS), geological srength index (GSI), disturbance factor (D), intact rock constant (mi), as well as seismic load factor, and groundwater level. The optimal geometry on the Highwall slope is the configuration of the Highwall slope with a height of 74 m and an angle of 23°, supported by a single slope of 5-10 meters, a berm of 7 meters with an angle of 40°. Seam D Claystone lithology with GSI 50, Siltstone with GSI 70, Sandstone with GSI 70, and Seam E Claystone lithology with GSI 50, Siltstone with GSI 40, Sandstone with GSI 75.Can be applied within a safe limit where FK Static 1.7 PK Static 0% and FK Dynamic 1.4 PK Dynamic 6%.

Ibrahim Idrees Ezzulddin; Hammad D. Merie

International Journal of Mechanical, Electrical and Civil Engineering 2025 Asosiasi Riset Ilmu Teknik Indonesia

This study examines the performance of a total of ten reinforced concrete T-beams, nine of which were made as hybrid beams by casting the web with LW concrete and the flange with HS concrete; the last beam was cast as a normal beam (entirely cast with HS concrete). All beams underwent testing under two-point loads following a 28-day period. The variables of the experimental program include the concrete grade within the web (46, 62, and 82 MPa) and stirrup distribution distances (100, 200, and 300 mm). The experimental program includes load-deflection curves and failure modes for hybrid and normal beams. The results showed that all the beams failed in shear-flexural mode. Also, increasing flange compressive strength increased shear. strength. Increasing stirrup distribution distance from 100 to 200 and 300 mm reduced the ultimate load capacity; specimens with stirrup spacing of 300 mm failed directly after yielding of steel due to crushing the concrete over the support and spalling concrete cover within the shear zone. The study also determined that reducing stirrup spacing to 100 mm did not alter the failure mode, as shear failure was dictated by the compressive strength of the lower layer of the hybrid beams (19 MPa compressive strength of LW concrete).

Ruswati Ruswati; Titin Supriyatin; Gilang Pranajasakti

Jurnal Pengabdian Sosial 2025 Lembaga Pengembangan Kinerja Dosen

Diabetes Mellitus is a metabolic disease caused by problems in the body in producing insulin, insulin produced is lacking or nonexistent, or it can be due to the insulin receptor not functioning so that cells cannot receive glucose for metabolism (Black, M. J. & Hawks, 2014; Pranata, S & Khasanah, 2017). Diabetic wounds are caused by infection as a result of high blood glucose, thereby increasing bacterial proliferation, and added to the deficiency of the immune system which causes the wound inflammation period to last a long time. In addition, inappropriate treatment of diabetic wounds (ulcers) can worsen the condition of the wound (Ekaputra, 2013). Therefore, proper and optimal wound care is needed. The wound care method that is currently developing is moist wound healing, which is more effective than conventional methods because it is easy to install, can adjust to the shape of the wound, easy to remove, comfortable to wear, does not need to change dressings frequently, absorbs drainage, presses and immobilizes wounds, prevents new wounds from mechanical injury, prevents infection, improves hemostasis by pressing the dressing. Wound care procedures through Debridement and dressing. Wound debridement can accelerate healing by removing necrotic tissue, particulates, or foreign material, and reducing the bacterial load. The conventional method is to use a scalpel and cut away all unwanted tissue including callus and eschar. Saline-moistened (wet-to-dry) gauze dressings; moisture-retaining dressings (hydrogels, hydrocolloids, hydrofibers, transparent films and alginates) that provide physical and autolytic debridement respectively; and antiseptic dressings (silver dressings, cadexomer). Newer advanced dressings are being studied, such as Vulnamin gel made from amino acids and hyaluronic acid used in conjunction with elastic compression have shown positive results.

Junaidi Junaidi; Aswin Syahputra; Nana Erika; Riyan Agus Faisal Hasibuan

International Journal of Health and Social Behavior 2025 Asosiasi Riset Ilmu Kesehatan Indonesia

Background:Gastritis is an inflammation of the stomach wall caused by irritation of the gastric mucosa. Gastritis caused by bacterial infections such as Helicobacteri pylory and irritant foods and drinks. The problem posed is acute pain. Nursing interventions to address this problem are pain management. Objective: This case study aims to describe the implementation of nursing pain management in gastritis patients with acute pain. Method: This case study design is a descriptive design in the form of a case study with a nursing care process approach. The case study subjects were 4 patients in the emergency room with the criteria of experiencing gastritis with problems acute pain. This case study was conducted at Muhammadiyah Palembang Hospital on March 16- 23, 2023. The nursing implementation provided was in the form of warm compress and deep breath relaxation to reduce pain in gastritis patients, in patient 1 before the implementation of the pain scale was 5 and fell to 3, the second patient initially had a pain scale of 4 decreasing to 2, in patient 3 the initial scale of 5 was reduced to a scale of 2, and finally patient 4 before the technique was carried out. out the pain scale in patients is 5 after being carried out down to a scale of 3. Using data collection techniques by means of observation, and interviews. Results: The research results describe the need for implementation of pain management (warm compress and deep breath relaxation) to reduce pain in gastritis patients from a moderate pain scale to a mild pain scale.Conclusion:There is an influence in implementing pain management on acute pain in gastritis patients.

M Altaf Hidayat; Irawan Danismaya; Amir Hamzah

Jurnal Ventilator: Jurnal riset ilmu kesehatan dan Keperawatan 2025 Stikes Kesdam IV/Diponegoro Semarang, Indonesia

High uric acid which causes joint pain is a disease where there is a buildup of purine which causes the joints to become inflamed to the point of swelling. Gout which occurs in people of course when they have a disease that causes gout they will undergo medical treatment to reduce uric acid levels and the pain that occurs in the elderly due to high levels. And most people assume that by taking medication they assume that the pain will disappear, according to Ilham (2019) that to reduce joint pain you can do ginger compress therapy on the joint pain, because the spicy effect of ginger can reduce pain in the joints. Objective: To determine the effect of ginger compress therapy on the level of joint pain in the elderly. Method: The design in this research uses a quasi-experiment using a one group pretest posttest design approach. Results: based on the results of statistical tests using the Paired Samples Test, the resulting P value is 0.000 < 0.05. Conclusion: it can be concluded that there is an influence of ginger compress therapy on the level of joint pain in the elderly in the working area of ??the Central Jampang Community Health Center. Suggestion: It is recommended for future researchers to measure the influence of respondent characteristics such as age, gender, education level, length of time suffering from joint pain, type of work and type of medication used.

Yadi Putra; Fauziah Fauziah; Muhammad Daud; Evi Hafriani; Nivi Sara Ivantaya +1 more

Jurnal Pengabdian dan Perubahan Sosial 2025 Lembaga Pengembangan Kinerja Dosen

This community service aims to increase the knowledge of the community in performing the first treatment of health problems experienced, especially by using warm compresses and cold compresses. The socialisation method uses lectures and questions and answers, power point media, projectors and props. This community service was carried out in collaboration with the Diploma III Nursing Study Program, Faculty of Health Sciences, Abulyatama University in collaboration with Miruk Lam Reudep Village, activities attended by 50 people. The results of the service provide increased knowledge to the community about using compresses in various health cases properly and in accordance with health conditions. The conclusion that this socialisation is very good for dealing with health conditions experienced at that time.

Meysil Musa; Raden Maria Veronika Widiatrilupi

Nursing Applied Journal 2025 LPPM STIKES KESETIAKAWANAN SOSIAL INDONESIA

Background: Dysmenorrhea, or menstrual pain, is a common health problem experienced by many adolescent girls worldwide. The prevalence of dysmenorrhea in Indonesia reaches 70%, significantly impacting adolescents' quality of life. This study aimed to explore the effectiveness of warm compresses as a method for managing dysmenorrhea pain among adolescent girls at SMA Negeri 1 Bonepantai. Objective: This study aims to measure the effect of using warm compresses on the level of dysmenorrhea pain in adolescent girls, as well as to provide insight into non-pharmacological methods that can be used as an alternative in dealing with this problem. Methods: This study used a pre-experimental design with one group pre- and post-test. The sample consisted of 35 tenth-grade female adolescents with dysmenorrhea, taken through purposive sampling. Initial data were collected using a visual analog scale (VAS) to measure pain levels before and after the warm compress intervention. Results: The analysis showed a significant decrease in pain levels after the application of warm compresses. The average pain score before the intervention was 7.5, while after the intervention it decreased to 3.2. The Wilcoxon Signed Rank Test showed a p-value of 0.000, indicating a significant difference between the pre-test and post-test scores. Conclusion: Warm compresses were proven effective in reducing dysmenorrhea pain in adolescent girls at SMA Negeri 1 Bonepantai. These findings demonstrate that simple interventions can have a positive impact on adolescent health and support the importance of further research into other methods of menstrual pain management.

Mutia Annisa Putri; Anik Purwati

Jurnal Ilmu Keperawatan dan Kebidanan 2025 Asosiasi Riset Ilmu Kesehatan Indonesia

Childbirth causes pain due to shortening of the uterine muscles. Normal childbirth occurs because of pain, which is an important part of labor. During labor, pain can influence uterine contractions through the secretion of catecholamines and cortisol. It improves the function of the sympathetic nervous system, changing blood pressure, heart rate, breathing, and length of labor. The aim of this research is to find out how warm compresses impact how severe the pain of labor during the first active phase is. This research design is pre-experimental with a one group pre test and post test design. The population in this study were all mothers giving birth at BPM Nursehan Dahliana Birayang (Hulu Sungai Tengah Regency, South Kalimantan Province), using an accidental sampling technique and a sample size of 30 respondents was obtained. A warm compress is placed on the lower abdomen using a hot bladder. Data analysis used the Paired T - test. Based on the research results obtained, the average pain score before treatment was 8.13 and the average pain score after treatment was 4.66. The results of statistical analysis of tests of differences in pain intensity before and after treatment showed significant differences (p=0.000; 95% CI -3.900-(-3.031). The conclusion of this study is: warm compresses can reduce the intensity of labor pain in the active phase of the first stage. Warm compresses can be used as a way to reduce the intensity of labor pain.

Alhamdi Agi Fadilla; Firrahmi Rizky

Jurnal Manajemen Kreatif dan Inovasi 2025 International Forum of Researchers and Lecturers

This research optimises the production of quality charcoal briquettes using the Multi Factor Evaluation Process (MFEP) method to meet the need for sustainable alternative energy. The main raw material is coconut shells, which are cleaned, burned in iron drums, and sun-dried to produce quality charcoal. Quality evaluation was conducted on calorific value, moisture content, ash content, and compressive resistance. Findings showed significant improvement in the quality of briquetted charcoal after the application of MFEP, with higher calorific value, lower moisture and ash content, and better compressive resistance. This research supports energy efficiency, reduces emissions, and improves environmental sustainability and community welfare.

Dwiyono Waluyo; Isnaini Lilis Elviyanti; Titi Maemunah; Ahmad Aftah Syukron

International Journal of Mechanical, Electrical and Civil Engineering 2025 Asosiasi Riset Ilmu Teknik Indonesia

Concrete is an important aspect of building construction, one of which is road construction. Concrete is used for road construction because it has the advantages of high compressive strength, easy maintenance, ease of formation, and easy to obtain components. Road construction using concrete is applied to the reconstruction of the Kebumen South Ring Road, where the Kebumen South Ring Road is a 9.07 km long national road. National roads are arterial and collector roads in the primary road network system that connect provincial capitals, national strategic roads, and toll roads. Therefore, construction on national roads requires strong and good materials on the Kebumen South Ring Road to optimize road use. In this study, the concrete is composed of Bima cement as Portland cement, coarse aggregate from Kebumen, fine aggregate from the Progo River, and water from drilled wells. The admixture was obtained from a Conmix HK 2. Subsequently, all ingredients were mixed using a mixer truck. The concrete mixture was molded into cylinders and blocks. In this study, the average results of the 5-day concrete compressive strength test were obtainedwhich is 373.42 kg/cm2 and 28-day-old concrete is 442.32 kg/cm2. The average result of the 5-day concrete flexural test is50.65 kg/cm2 and that of 28-day-old concrete was 60.73 kg/cm2. The results are in accordance with the general specifications of the Bina Marga, namely, 45 kg.

Adnan Adnan; Jasman Jasman; Salasiah Salasiah; Miswar Tumpu

Proceeding of the International Conferences on Engineering Sciences 2025 Asosiasi Riset Ilmu Teknik Indonesia

The United Nations and the World Meteorological Organisation predict that around 5 billion people will lack clean water and even drinking water (Source: Conference on Our World in Concrete and Structure in Singapore). Based on the aforementioned phenomenon, given the abundant potential of seawater resources, there is an idea to use seawater as a concrete admixture, especially in building locations that often interact with seawater. Research is carried out in an effort to find alternatives to improve the mechanical properties of concrete such as compressive strength values, split tensile strength, namely by using additives as self-compacting concrete technology and making seawater and sea sand as a substitute for fresh water and river sand

I.G.A. Uttariyani; Diki Diki; Widiasih Widiasih; Muhamad Dahsyat; Hasoloan Siregar

Proceeding of the International Conferences on Engineering Sciences 2025 Asosiasi Riset Ilmu Teknik Indonesia

The research project of the Open University and the National Research and Innovation Agency is taking place at the Open University, to design a turbojet engine that produces the targeted thrust at a speed (M), the height of the pilot with the rotational speed (RPM) set in the research activity. This paper presents the design of the performance of a single spool turbojet engine at Design Point (DP) and Off-Design Point (ODP) conditions. The calculation of the DP condition is solved using equations that have been provided in the literature, to obtain the appropriate mass flow rate. In the calculation of ODP with variations in temperature, pressure, Mach numbers using the C.N.Reffold semi-dimensional mass flow (SDMF) method to find the compressor pressure ratio. The purpose of this article is to present an ODP calculation that avoids the use of "nested" repetitive calculations and simplifies the solution process by using manual calculations with a success rate of less than 5%.