Study of Flood Impact Handling in Pekalongan District

The flood disaster that occurred in Pekalongan district in February 2021 was caused by the high intensity of rain for one week with rainfall >50 mm/day and the ebb and flow of sea water due to tides reaching 0.9-1.1 meters. Other problems due to flooding in Pekalongan district are change in land use, land subsidence, waste, erosion-sedimentation, as well as operation and maintenance factors. Losses due to floods cause material and building losses and traffic conditions are paralyzed. The method used in this research is primary and secondary data collection, descriptive qualitative data processing by describing understanding, research approach with field observations. Flood handling that has been carried out is by adding an emergency sliding door to the drainage, procuring a mobile water pump with a capacity of 250 liters/second, a CCSP (Corrugated Concrete Sheet Pile) embankment, rehabilitation of the Bremi River floodgate, construction of a Mrican pump house with a capacity of 8×2 m3/second, and construction of a 2,200 meter long Silempeng earthen embankment. The emergency handling that was carried out during the floods of February 2021 was the opening of the Long Storage Silempeng-Sengkarang and the preparation of sandbags and large sacks for emergency handling.

A Predict Method of Water Pump Operating State Based on Improved Particle Swarm Optimization of Support Vector Machine

In order to improve prediction accuracy of water pump operating state, a chaotic prediction model of the pump vibration data based on improved particle swarm optimization of support vector machine is proposed in this paper. Firstly, a grouping optimization strategy particle swarm algorithm based on cosine function is proposed. Then, the training set is obtained on the time series of vibration data by phase space reconstruction. Secondly, The improved particle algorithm is used to optimize the penalty parameters, insensitive loss coefficient and width parameters of support vector machine. Then, a prediction model of vibration data is established by using support vector machine combined with training set and optimal parameters. Finally, the operating state of the pump is predicted according to pump vibration measurement and evaluation method. Compared with the method of linear decreasing weight strategy, the method proposed in this paper is more accurately.

Rancang Bangun Sistem Monitoring Kelembaban Dan Suhu Tanah Untuk Tanaman Bawang Merah Di Kabupaten Brebes

Tanaman bawang merah merupakan salah satu kebutuhan pokok, benih bawang merah yang baik adalah yang tumbuh secara optimal yang dipengaruhi beberapa faktor salah satunya adalah presentase kelembaban dan suhu tanah. Syarat tumbuh optimal benih bawang merah harus ditanam pada tempat yang kelembaban dan suhu tanahnya sesuai dengan yang dibutuhkan benih bawang merah. Berkembangnya teknologi saat ini dimungkinkan membuat sebuah teknologi dibidang pertanian. Pada penelitian ini dikembangkan sistem monitoring kelembaban dan suhu tanah dengan media penyiraman, alat ini berfungsi untuk mengukur dan menormalkan kelembaban dan suhu tanah untuk tanaman bawang merah. Pengukuran kelembaban tanah menggunakan sensor kelembaban tanah, pengukuran suhu tanah menggunakan sensor DS18B20. Sistem ini menggunakan Arduino Nano sebagai penggerak utama. Cara kerja alat ini adalah saat sensor kelembaban tanah mendeteksi kelembaban di bawah 50% maka mikrokontroler akan mengaktifkan water pump, saat sensor mengukur kelembaban tanah diatas 70% maka mikrokontroler akan memberi perintah water pump off. Seluruh informasi menghidupkan dan mematikan water pump akan ditampilkan pada LCD. Hasil penelitian nilai suhu tanah yang cocok sebesar 25°C-32°C dan nilai kelembaban tanah 50%-70%, untuk jenis tanah yang cocok untuk tanaman bawang merah adalah tanah aluvial yang tidak mudah kering sehingga nilai kelembaban tanah lebih stabil.

Modeling, Simulation, and Analysis of a Variable-Length Pendulum Water Pump

Due to the long-term problem of electricity and potable water in most developing and undeveloped countries, predominantly rural areas, a novelty of the pendulum water pump, which uses a vertically excited parametric pendulum with variable-length using a sinusoidal excitation as a vibrating machine, is presented. With this, more oscillations can be achieved, reducing human effort further and having high output than the existing pendulum water pump with the conventional pendulum. The pendulum, lever, and piston assembly are modeled by a separate dynamical system and then joined into the many degrees-of-freedom dynamical systems. The present work includes friction while studying the system dynamics and then simulated to verify the system’s harmonic response. The study showed the effect of the pendulum length variability on the whole system’s performance. The vertically excited parametric pendulum with variable length in the system is established, giving faster and longer oscillations than the pendulum with constant length. Hence, more and richer dynamics are achieved. A quasi-periodicity behavior is noticed in the system even after 50 s of simulation time; this can be compensated when a regular external forcing is applied. Furthermore, the lever and piston oscillations show a transient behavior before it finally reaches a stable behavior.

The Development of a New Phosphogypsum-Based Construction Material: A Study of the Physicochemical, Mechanical and Thermal Characteristics

Phosphogypsum (PG) is a waste (or by-product) of the production of phosphoric acid, a basic constituent in the manufacturing of modern fertilizers. The annual production of phosphogypsum in Tunisia is currently estimated to be 10 million tons. Its storage in slag in close proximity to production plants generates pollution problems; however, valorization may be a solution. The present paper proposes a simple process for the valorization of this by-product into a construction material. Several physicochemical characterizations are used to prove the characteristics of samples. The chemical composition shows that PG is a gypsum compound with several impurities. The morphological analyses show that the powder materials are mesoporous with a lower specific area. The structural characterizations show that these solids play the role of a water pump as the degree of hydration changes from 2 to 0 and vice versa, depending on the temperature. Mechanical and thermal analyses show that the prepared formulation is brittle and insulating, which presents opportunities for it to be used as a decoration material.

Analysis of the advanced oxygenate water level control scheme of the engineering supercritical unit

The oxygenate water level is an important adjustment parameter in the operation of the fire generator set, and the water level may result in the safety of the water pump. The high water level will not only affect the oxygen effect, but it is also possible to cause the water shot to the steam turbine to cause a water shot or give the water tank full water, oxygenate vibration, drain and vapor with water. When the load is low (generally 35% rated load), the oxygenate water level is controlled by large and small valve, condensate pump variable frequency control condensed water drum pressure. When the unit load is high (greater than 35 rated load), the oxygenate water level is controlled by the condensed water pump, the large valve and small valve controls condensed water drum pressure.