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Clean water is one of the most basic needs of humans as it is constantly needed in their daily activities to survive. The aim of this study is to ensure the correct dosage of Poly Aluminium Chloride (PAC) for at a certain level of rigidity and to avoid chemical waste. Overall, data analysis shows that the water quality in IPA Krian is well awake and in line with applicable standards. This reflects an effective water quality management and monitoring system at the site, with proper adjustment of the fluorescent dosage and the implementation of an efficient water management system.

This research develops a smart doorlock system for engine rooms and platforms based on RFID technology and the Arduino platform. This system is designed to increase security and efficiency in managing access to important areas on a ship or industrial installation. The method used involves the integration of an RFID module as an authentication medium and an Arduino microcontroller as the system control center. Users can open the door simply by holding the registered RFID card close to the RFID reader, which then sends a signal to the Arduino to activate the door lock mechanism. This system is also equipped with an access data recording feature that allows real-time monitoring and review of incoming and outgoing activities. Test results show that the system functions well in various scenarios, demonstrating high reliability and responsiveness. Thus, this RFID and Arduino based smart doorlock system can be an effective solution in improving security and access control in critical environments.    

The impact of the increase in motorized vehicles is air pollution from vehicle exhausts. Exhaust gas is a polluting substance that pollutes the air where the gas is created from exhaust gas or gas from the combustion of vehicles. One alternative way to reduce the content of harmful exhaust gases such as carbon monoxide (CO), and hydrocarbons (HC) produced by motorized vehicles is by adding a catalytic converter. In this study, the catalytic converter uses Aluminum (Al), Brass (Cu-Zn), and Copper (Cu) materials. The purpose of this study is to analyze the effect of using a catalytic converter made of Aluminum (Al), Brass (Cu-Zn), and Copper (Cu) on exhaust gas. In addition, this study aims to determine the material used as a catalytic converter in order to get the lowest level of exhaust gas. Furthermore, the research data are presented in tabular form and then analyze them using one way anova and graphs. The results showed a decrease in CO by 50% at 1500 Rpm and 59.6% at 4500 Rpm, HC by 72% at 1500 Rpm and 55% at 4500 Rpm, CO2 by 3.22% at 1500 Rpm and 7.91% at 4500 Rpm, and O2 by 5.53% at 1500 Rpm and 1.66% at 3000 Rpm.

The determination of changes in the land surface is an event caused by changes in the volume of the rock layer below. and geological processes such as tectonic and volcanic activity, removal of material from the subsurface such as mining and natural causes such as the occurrence of holes in limestone. The purpose of this study is to determine the magnitude of land surface changes that occur in the Nias Island area caused by earthquakes. The data used in the processing stage with the DinSAR method in 2022 recording, with specifications of dual polarization VV + VH, beam mode IW (interferometric wide) and flight direction ascending. Sentinel 1 data used in this study are 4 pairs of scans, where each pair of scans consists of one scans being the master and another scans being the slave. The master image is the SAR image before the earthquake, while the slave image is after the earthquake. The magnitude of land surface changes that occurred on Nias Island, based on the 2022 earthquake, the largest uplift was the earthquake on December 30, 2022, with a range of values (1.012042) mm with an area of 72,641,981 Hectares. The largest subsidence occurred in the earthquake on December 30, 2022, with a range of values ranging from (-1.373125) mm to (-1.235427) mm with an area of 61347,891 Hectares.

In the era of maritime technology, Unmanned Surface Vehicles (USVs) are becoming the main vehicles on the water surface, controlled from land and capable of transmitting live data. USVs have a wide range of survey and exploration applications, relying on hydrographic knowledge for accurate mapping. USV development has adopted a double hull design, improving stability and wave resistance. Survey data transmission requires advanced technology, with Long Range (LoRa) technology being the solution for long distance data transmission with low power consumption. LoRa utilisation is expected to increase the efficiency of USVs in hydrographic surveys. The research and development (R&D) research method is used as the main approach in this research with the aim of creating and developing USVs that can increase efficiency in hydrographic surveys. The USV is equipped with an RPM sensor and flowmeter used to monitor the movement control of the USV in the waters. In addition, a depth detector is used to monitor the topography of the seabed. In order for this USV to run using a remote control that is controlled from land. The USV drive consists of a BLDC motor connected to the propeller and a servo motor connected to the ship's rudder. Furthermore, the data taken from the sensor is sent via LoRa to be delivered to the ground station. From the USV test results, it was found that the data transmission range with LoRa Ra-02 under Line of sight (LOS) conditions was 340 metres while under Non Light of sight (NLOS) conditions it was around 200 metres. The average speed travelled by USV is 0.616 km/hour in operational survey conditions and can be faster in non-operational survey conditions. The error value of the RPM sensor is obtained at 1.604% with a reading accuracy of 98.936%.

The development of the automotive industry is now experiencing a very rapid increase in the type of motorcycle. One of them is a motorcycle with automatic transmission or automatic motorcycle or CVT (Continously Variable Transmission). Matic motorcycle users often experience a lack of performance when used on daily trips. The mass of CVT rollers and springs is the main factor in the lack of performance of the matic motorcycle which is less efficient for its users. This research was conducted to determine the effect of increasing power and torque on motorcycles that are now declining in performance. The method used in this research is experimentation. Tests were carried out using a dynamometer tool to determine the comparison of the results of the variables carried out and compared to obtain maximum power and torque. The data obtained will be analyzed using statistical methods to evaluate the relationship between changes in roller mass and spring constant to power and torque. The results showed that the maximum power generated was at a roller variation of 11 grams and a spring constant of 33.78 N/cm of 7.19 HP at 6500 rpm engine speed. While the maximum torque is generated from the variation of roller 13 grams and spring 28.83 N / cm of 8.00 Nm at 6000 rpm engine speed.      

The Brantas River is a large river in East Java that has an important role for the community. Seasonal changes have an impact on the quality of the Brantas River in Indonesia. Testing is conducted by comparing samples taken twice a year, representing the dry and rainy seasons. The river's quality is analyzed based on several parameters such as Dissolved Oxygen (DO), BOD, COD, NO3-N, and Phosphate. The results are then compared with the standard river quality according to Government Regulation No. 22 of 2021. The analysis results indicate that the season has a significant impact on the river water quality, as seen from the different parameters in each season.  

The influence of the principal's leadership on teacher work motivation (Waitabula Elementary School) The influence of the Principal's leadership on teacher work at Waitabula Elementary School. This research aims to determine the description of teachers' work at SDK Waitabula and the relationship between teachers and the leadership of the school principal. This research is quantitative research. Meanwhile, based on the source, this research uses primary data, namely data collected by the researcher himself through distributing questionnaires to respondents, in this case is teachers at Waitabula Elementary School with a total of 36 respondents. The data collection method uses a questionnaire with a measurement scale and data obtained by descriptive statistical analysis. Data processing was carried out using SPSS version 20. Based on the research results, it showed that the school principal's leadership was in the high category with descriptive analysis results of 95% and the teacher's work was also in the high category with a percentage of 100%. The principal's leadership and teacher work motivation have a very strong relationship. The correlation coefficient value is 0.823 and the style applied by the principal at Waitabula Elementary School is the influence of leadership.    

Sumba Kitchen offers a variety of food menus. Not just local specialty food. There is also a menu of Indonesian food such as meatballs, rawon, fried noodles and processed sea fish. There are also western dishes such as pizza, burgers and spaghetti. So for those of you who find it difficult or afraid to enjoy new dishes, you can choose Indonesian and Western menus which are already familiar to your tongue, this could be a solution. Another interesting thing apart from opening a restaurant and cafe, the owner of Dapur Sumba also opened a bakery called Galaxy Bakeries. So for tourists who want to buy snacks to snack on while traveling or who intend to buy souvenirs for people at home, you can buy them here. Dapur Sumba also provides HR (Human Resources) who are qualified to provide services in restaurants, cafes and bakeries. . The human resources prepared by the owner of Dapur Sumba are in the form of (reliability, responsiveness and empathy). This research aims to analyze the influence of service quality on customer satisfaction. There are three hypotheses developed in this research, namely: 1) Customer quality has a positive effect on customer satisfaction. Data collection method is through distributing questionnaires to respondents directly. The respondents in this research were Sumba Kitchen customers. The number of questionnaires distributed was 98. The test technique used uses a validity test and a reliability test. Testing the first and second hypotheses uses a simple linear regression test. The research results show that service quality has a positive and significant effect on customer satisfaction  

Leaders fungtion to guide, direct, mentor, build work motivation, drive the organization, establish good communication, cary out regular supervision, and direct their subordinatis to the targets they want to achieve. In this regard, it is the obligation of every leader tomotivatie his suberdinates to work better, the leadership role is also a way that a person has to influance a group of people or subordinates to work together and make efforts with enthusiasm and confidence to achive the goals that have been set. The success of an organization, both as a whole and as a group whitin a particular organization, really depends on the effectiveness of leadership to increase employe motivation or enthusiasm for their duties and responsibilities.  

This research aims to investigate the influence of human resources in digital marketing development on consumer purchasing interest, at business source stores. The research method used is quantitative using a questionnaire as a data collection tool. The sample for this research is consumers of business source stores who have made online transactions. Data analysis was carried out using multiple linear regression to test the relationship between digital marketing human resource variables and consumer buying interest. The research results show that human resources who are skilled and experienced in digital marketing have a positive and significant influence on consumer buying interest. The managerial implication of this research is the importance of investing in developing quality human resources in the digital marketing field to increase consumer buying interest and strengthen the competitive advantage of business resource stores in the market.    

This research aims to analyze the influence of motivation and discipline on teacher performance in secondary schools. Motivation and discipline are two important factors that can influence teacher work effectiveness and productivity. This research uses a quantitative method with a survey approach, where data is collected through questionnaires filled out by a number of teachers. The results of data analysis show that both motivation and discipline have a significant influence on teacher performance. High motivation and strict discipline contribute positively to increased performance. These findings show the importance of effective management of motivation and discipline to improve the quality of education in schools.  

Changes in society and technological developments that occur in the current era of globalization have resulted in the emergence of new products from various companies. This has an impact on companies competing with each other to get consumers who are the targets of each company to market their products. It is not easy for companies to get consumers because they often face problems, especially related to efforts to market their products to the market. Seeing what is described above, marketing is one of the activities carried out by a company to maintain its survival, develop and gain profits and can strengthen its position in facing competing companies. This research aims to find out whether the factors price, image, model, quality, service and spare parts can significantly influence consumers to be loyal to Honda brand motorbikes partially or together, and between these factors. What factors have the most significant influence on consumers. This research was carried out by providing a simple service by giving questionnaires to 100 respondents who were considered to represent this research    

A river basin (DAS) is an area bordered by mountain ridges where rainwater that falls on the area will be collected by the mountain ridges and will be channeled through small rivers to the main river (Asdak, 1995). A watershed includes a land area which is one unit with a river and its tributaries, which functions to accommodate, store and channel water originating from rainfall to a lake or to the sea naturally, where the boundary on land is a topographical divide and the boundary at sea is up to with water areas that are still affected by land activities. The Lematang River is one of the longest rivers in South Sumatra, the length of the Lematang River is 271 km with a watershed area (DAS) of 295.88 km2. The existence of the Lematang watershed is a source of life for the Lahat community. The decline in the carrying capacity and carrying capacity of the Lematang watershed due to land use can be seen from flash floods and landslides, where flash floods bring sedimentation, logs of wood and twigs causing losses to the community. To overcome the problems of the Lematang Ulu watershed, Integrated Watershed Management is needed by taking concrete steps in the form of efforts to formulate goals, synchronize programs, implement and control watershed resource management across stakeholders in a participatory manner based on studies of biophysical, economic, social, political and institutional conditions in order to realize the goals. Watershed Management.

PT X is an animal feed industry located in East Java that generates Hazardous and Toxic Substances (B3) waste. The industry has a Temporary Storage Facility (TPS) building for storing its waste. However, an evaluation based on Regulation Permen LHK no. 6 of 2021 shows several non-compliances in the design and waste storage procedures of the B3 waste TPS. This study is conducted to evaluate and redesign PT X's B3 waste TPS to address the identified non-compliances. The stages of redesigning PT X's B3 waste TPS include: 1) identifying B3 waste, 2) evaluating the existing condition of the B3 waste TPS, 3) redesigning the B3 waste TPS, and 4) describing the building design changes. The new B3 waste TPS is designed to store toxic, liquid, and flammable waste with building dimensions of 4.15 m x 2.25 m x 3.675 m. The redesigned B3 waste TPS complies with regulations more effectively and addresses previous shortcomings.

In this digital era, network speed is very important, because nowadays many people use the internet as a companion in various events. Data communication is one of the means to allow several devices to communicate with each other. To simplify and speed up network usage, the Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) protocols are used as the transport layer during data transfer. In running this simulation using the Cisco Packet Tracer simulation application using bus topology as the topology type.

Fresh water is a basic need of the ship's crew in supporting the creation of smooth ship operating activities, therefore it is also necessary to have an auxiliary aircraft that can produce its own fresh water on board to reduce ship operating costs, which is called the Fresh Water Generator (FWG).  FWG is an auxiliary aircraft that can convert seawater into fresh water by evaporation and condensation processes. Therefore, it is necessary to have a tool to monitor the performance of the fresh water generator. The purpose of this research is none other than to monitor temperature conditions, water TDS, and conditions on the input and output streams of the fresh water generator evaporator filter to be more optimal and efficient and to determine the reliability of the fresh water generator performance equipment system using a long distance in order to create better and higher quality fresh water production on board. This research uses a prototyping method system. After designing and testing the tool monitoring system for the performance of fresh water generators using Arduino mega 2560 based on LoRa Ra-02, this system is one of the new technologies that can monitor the performance of fresh water generators to be more efficient and reliable. Then the readings of all sensors can work properly with an average percentage error on the Max 6675 temperature sensor of 0.58%, pressure transmiter sensor 1 of 2.04%, pressure transmiter sensor 2 of 2.04%, and TDS  sensor of 1,70% and the distance to communication between the receiver and transceiver reaches a range of 200 meters without obstacles and 97 meters through obstacles around.

Indonesia's natural and cultural riches have attracted the attention of foreign researchers to conduct research in Indonesia. Indonesia is considered to be one of the largest biological laboratories in the world, so there are many objects that can be used for research by foreign researchers. To provide research licensing services for foreign researchers who wish to conduct research in Indonesia, a legal basis was issued, namely Law No. 11 of 2019 concerning the National System of Science and Technology which regulates research licensing for foreign researchers in Indonesia. As a supporter of Law no. 11 of 2019, BRIN Regulation no. 22 of 2022 concerning Ethical Clearance has been issued. To provide foreign research licensing services according to Law No. 11 of 2019, it is carried out by the Directorate of Research and Innovation Licensing and Scientific Governance of the National Research and Innovation Agency (BRIN). To make it easier to apply for research permits for foreign researchers, several service improvements were made, namely the first was the formation of an ethics commission team to replace the TKPIPA team to evaluate incoming proposals. Second, the number of files that foreign researchers need to prepare is less than before, namely from 14 documents to 7 documents. Third, creating an ethical clearance website to upload the required files in digital form which was previously done offline and submitting hard copy files. Fourth, the addition of financial reporting features to make it easier to check payments and send research progress reports by foreign researchers.

Uniaxial Compressive Strength is a test method to classify the strength and characterization of intact rock. Where it is important information in determining the strength and characteristics of a rock obtained by testing using the UCS tool. In this research, an alternative is made in determining the UCS value precisely and easily, namely by using the schmidt hammer test and compressive strength test. Therefore, this research aims to obtain the correlation value between the results of the compressive strength test and the schmidt hammer test on siltstone.This research is a quantitative research, so that to obtain accurate calculation data, testing methods are used in the form of compressive strength tests on rocks and schmidt hammer tests, which in this case are tested on siltstone samples. In this study, 2 rock formations were used, including the Pulau Balang formation and the Kampung Baru formation, so that the accuracy of the test results can be obtained properly.  Based on the results of observations and calculations that have been made, it can be concluded that the correlation of the uniaxial compressive strength value with the rebound number schmidt hammer value shows a positive linear correlation between the UCS value and the rebound number schmidt hammer value, in this case it can be seen when the uniaxial compressive strength value is higher, the rebound number schmidt hammer value is also higher.

Currently, the development of communication networks has influenced how humans communicate and exchange information. Data communications technology reflects the rapid evolution in the way humans communicate and exchange information. Data communication is the process of exchanging information between two or more devices via a transmission medium, such as cables, radio waves, or other network infrastructure. The goal of data communications is to transfer data from one location to another quickly, efficiently, and accurately. The method used is to look for references from several internet sources such as Google. The OSI model has 7 layers, namely Application Layer, Presentation layer, Session Layer, Transport layer, Network layer, data link layer, physical layer