The community service program for planting mangrove trees at Tirang Beach, Semarang aims to increase public awareness of the importance of mangrove ecosystems and improve coastal environmental conditions. This program will be implemented through mangrove tree planting activities and counseling regarding the benefits of mangrove ecosystems for the environment. The method that will be used in this program is data collection through surveys to determine the level of public awareness regarding the importance of mangrove ecosystems and coastal environmental conditions. Furthermore, mangrove tree planting activities will be carried out together with the local community, involving experts in the environmental and fisheries fields. In addition, counseling will be carried out regarding the benefits of mangrove ecosystems for the environment, including as a place for various types of fish and wild animals to live, as well as protecting the coast from abrasion. Through this program, it is hoped that people will become more aware of the importance of preserving mangrove ecosystems and protecting the coastal environment. The expected results of this program are increasing public awareness of the importance of protecting the coastal environment and mangrove ecosystems, as well as increasing the number of mangrove trees on Tirang Beach. This program is also expected to be an example for other communities to preserve the environment and encourage the creation of a healthier and more sustainable environment.

Garbage is a problem that has become a global environmental issue. Problems that arise in each region can vary, whether it is about the accumulation of organic or non-organic waste. One solution to this waste problem is the existence of waste processing activities. Waste processing is part of waste management by reducing the amount of waste, in addition to utilizing the values contained in the waste itself (recycled materials, other products, and energy). Waste management is crucial and important at this time, given the large volume of waste generated in each region and needs to be handled to keep the environment clean and nice. The waste problem in Semarang Regency, especially in the Demak District, is the chosen place in this study. Through the study of literature, followed by the related waste in each village in the exploration, by the development of solutions for each problem. Organic waste that can be processed into organic fertilizer, non-organic waste, especially plastic can be a advantogous material to produce paving blocks. The results of this research are also compiled in the form of an educative and interesting ebook to inspire the community and encourage positive activities for the community.

An expert system is a system that seeks to adopt human knowledge to a computer that is designed to model problem solving abilities like an expert (Durkin, 1994). The three main components contained in any expert system are the knowledge base, the inference engine, and the user interface. Forward chaining is a strategy to predict or find a solution to a problem that starts with a set of known facts, then derives new facts based on rules whose premises match the known facts. This process is continued until the goal is reached or there are no more rules whose premise matches the known facts. The system maker application media uses PHP and MySQL as databases

Number of fish seed can be measured by means of conventional observation using eye senses. But when the fish seed measured pretty much it will take a long time (not efficient) and cause incorrect measurement results (inaccurate). The accuracy of calculation of fingerlings is crucial trust between seller and buyer.During this time a sensor is used to detect the amount of fish seed is passed through a transparent hose using a light sensor (Light Dependent Resistor) and photodiode sensors as infra red light receiver. The level of accuracy of the sensor lies in the intensity of the light beam is received so that the sensor will be impaired if airya murky and there are air bubbles pass through the sensor so that the fish count error occurs.This research will be conducted design counters the number of fingerlings using infra red phototransistor sensor with a frequency of 20KHz to fish and then processed using the logic matrix. Results matrix logic into the data input to be processed by a microcontroller as the basis of results of calculation of the amount of fish.Development model studies using models of R & D (research and development) that produce a product in the form of the final product. Experiments were carried out using the type and length of catfish fingerlings with a length of 3 cm to 5 cm. Fish seed count tool has been tested to catfish farmers in the village Siwarak Ungaran City.The trial results calculators fish seeds have difference of 3% of the calculated results Manual or accuracy of calculation results have fish reaches 97%, then a counter of fish seed is acceptable to be used by catfish farmers.

Concrete research has been carried out, this study utilizes wood burning husk ash and fine powder of briquette charcoal as an added material from the weight of cement and sand used from Boyolali. This study aims to determine the compressive strength of concrete with materials added to wood burning husk ash and fine powder of briquette charcoal. Material variations added wood burning husk ash and briquette charcoal fine powder by 0%, 10%, 20% by weight of cement. This study used 0.5 fas and concrete testing at the age of 7 days, 14 days and 28 days. From the test results the average compressive strength of concrete at the age of 7 days with a material variation of 10% added was 15.05 MPA, and a material variation of 20% added was 13.47 MPA. Concrete at the age of 14 days with a material variation of 10% added is 15.76 MPA, and a material variation of 20% is 13.18 MPA. concrete at 28 days with a material variation of 10% added is 14.32 MPA, and a 20% added material variation is 14.32 MPA.  Keywords; wood burning husk ash, compressive strength, fine briquette charcoal powder  AbstrakPenelitian beton telah banyak dilakukan, penelitian ini memanfaatkan abu sekam pembakaran kayu dan serbuk halus arang briket sebagai bahan tambah dari berat semen dan pasir yang digunakan dari boyolali. Penelitian ini bertujuan untuk mengetahui kuat tekan beton dengan bahan tambah abu sekam pembakaran kayu dan serbuk halus arang briket. Variasi bahan tambah abu sekam pembakaran kayu dan serbuk halus arang briket sebesar 0%, 10%, 20% dari berat semen. Penelitian ini menggunakan fas 0,5 dan pengujian beton pada umur 7 hari, 14 hari dan 28 hari. Dari hasil pengujian kuat tekan rata-rata beton pada umur 7 hari dengan variasi bahan tambah 10% adalah 15,05 MPA, dan vari asi bahan tambah 20% adalah 13,47 MPA. Beton pada umur 14 hari dengan variasi bahan tambah 10% adalah 15,76 MPA, dan variasi bahan tambah 20% adalah 13,18 MPA. beton pada umur 28 hari dengan variasi bahan tambah 10% adalah 14,32 MPA, dan vari asi bahan tambah 20% adalah 14,32 MPA.  Kata kunci : abu sekam pembakaran kayu, kuat tekan, serbuk halus arang briket

Abstrak: Sistim pracetak sudah banyak digunakan pada bangunan bertingkat banyak. Penggunaan metode pracetak dengan ukuran panel yang cukup besar menjadi tidak efisien jika diterapkan pada pekerjaan bangunan bertingkat dua sederhana. Dalam penelitian ini alternatif yang diperkenalkan dalam pembuatan pelat lantai adalah dengan menggunakan metoda semi precast berupa panel-panel yang lebih kecil agar memungkinkan untuk diangkat tanpa bantuan alat berat.Penelitian yang dilakukan mempunyai tujuan untuk mengetahui berapa besar penghematan waktu dan biaya yang digunakan dengan menggunakan pelat semi precast dibanding dengan menggunakan sistem cast in situ. Dengan harapan akan didapat suatu metode pelaksanaan dan cara perancangan yang lebih efisien serta dapat mengoptimalkan penggunaan pelat semi precast sebagai komponen bekisting sekaligus sebagai komponen elemen struktural lantai bangunan gedung dan dapat diaplikasikan pelaksanaannya pada pekerjaan swakelola oleh masyarakat.Penelitian dilakukan pada rumah di Jalan Prambanan Timur II Semarang dengan luasan tanah sebesar 247.5 m2, luas bangunan 300   m2, luas pelat lantai sebesar 129,5 m2 dan pelat tandon air sebesar 13 m2.  Dari hasil analisis total biaya pembangunan rumah tinggal dengan metode cast in situ adalah Rp 1.348.511.161,00 dan dengan metode cast in situ adalah Rp   1.286.646.693,00. Dari hasil tersebut nampak bahwa menggunakan metode semi precast selisih atau lebih murah sebesar Rp   61.864.468,00 atau sebesar 4,59 %. Dari hasil analisis kurva S pembangunan rumah tinggal tersebut dengan menggunakan metode cast in situ membutuhkan waktu 48 minggu, sedangkandengan menggunakan sistem semi precast membutuhkan waktu 42 minggu. Dari hasil tersebut nampak bahwa menggunakan metode semi precast selisih atau lebih cepat 6 minggu atau sebesar 12,5%. Hasil penelitian tersebut menunjukkan bahwa dari segi biaya dan waktu, metode pelaksanaan dan cara perancangan pelat semi precast lebih efisien daripada metode pelat cast in situ dan dapat diaplikasikan pelaksanaannya pada pekerjaan swakelola oleh masyarakat. Hasil penelitian tersebut menunjukkan bahwa dari segi biaya dan waktu, metode pelaksanaan dan cara perancangan pelat semi precast lebih efisien daripada metode pelat cast in situ dan dapat diaplikasikan pelaksanaannya pada pekerjaan swakelola oleh masyarakat.  Kata Kunci: pelat lantai, semi precast, Rancancangan Biaya Anggaran, kurva S  Abstract: The precast system has been widely used in multi-storey buildings. The use of precast methods with large enough panel sizes becomes inefficient when applied to simple two-story building work. In this study an alternative introduced in the manufacture of floor plates is to use semi-precast method of smaller panels to enable to be removed without the help of heavy equipment.The research has a purpose to find out how much time and cost savings are used by using semi-precast plate compared with using cast in situ system. With the hope of getting a method of implementation and design more efficient way and can optimize the use of semi-precast plates as components of formwork as well as components of structural elements of the building floor and can be applied to the implementation of self-managed work by the community.The study was conducted at the house on Jalan Prambanan Timur II Semarang with a land area of 247.5 m2, a building area of 300 m2, a floor plot area of 129.5 m2 and a water supply plate of 13 m2. From the analysis of total cost of residential development with method of cast in situ is Rp 1.348.511.161,00 and with method of cast in situ is Rp 1.286.646.693,00. From the result it appears that using semi precast method difference or cheaper is Rp 61.864.468,00 or 4.59%. From the residence curve S residence analysis using cast in situ method takes 48 weeks, sedangkandengan using semi precast system takes 42 weeks. From the results it appears that using semi precast method difference or faster 6 weeks or 12.5%. The results of this study indicate that in terms of cost and time, the method of execution and the design of semi-precast plates more efficient than cast in situ plate method and can be applied to the implementation of self-managed work by the community. The results of this study indicate that in terms of cost and time, the method of execution and the design of semi-precast plates more efficient than cast in situ plate method and can be applied to the implementation of self-managed work by the community.  Keywords: floor plates, semi precast, Budget Cost Design, S curve

Balok beton bertulang T adalah balok stuktur yang banyak digunakan. Penelitian perilaku komponen struktur dapat dilakukan melalui penelitian eksperimental dan analisis. Penelitian eksperimental akan menghasilkan prilaku aktual struktur, namun memerlukan waktu dan biaya yang tidak sedikit serta untuk kasus tertentu memerlukan peralatan laboratorium khusus, sedangkan analisis dengan program komputer cukup efektif dalam hal waktu, biaya dan peralatan yang digunakan namun hanya menghasilkan pendekatan dari prilaku struktur, sehingga perlu mengetahui tingkat akurasi analisis dengan Respose-2000 dalam analisis balok beton tampang T.Penelitian ini menggunakan data penelitian Amir (2010) sebagai pembanding dengan hasil analisis. Hasil penelitian analisis teroritis menggunakan program Response-2000, pada pola retak yang terjadi untuk benda uji maupun analisis dapat dikategorikan tipe keruntuhan yang terjadi adalah keruntuhan lentur. Kapasitas daya dukung beban untuk benda uji berdasarkan hasil pengujian dengan hasil analisis menggunakan program Response-2000 menunjukkan   tingkat kecocokan yang cukup tinggi   terlihat dari rasio yang mendekati 1