Aplikasi Penyandian Pesan Teks dengan Menggunakan Metode Block Chiper Mode ECB

Encoding of text messages is very necessary to encode a message so that it is not stolen by irresponsible parties. Cryptography is one technique that can be used to carry out security messages, namely by encoding original messages that are understood to be incomprehensible data. Cryptographic techniques are used using the Block Cipher mode ECB method that works by using 64-bit keys and an iterative method consisting of linear steps (such as XOR and key applications). ECB block cipher mode application is to use J2ME as a testing tool. The text message will be entered into Netbeans and tested for the results of encryption and decryption. The design of system testing is done in several stages, namely making use case diagrams, Activity diagrams, Sequency diagrams and design interface

Kajian Hukum Tentang Tindak Pidana Kekerasan yang Dilakukan Secara Bersama-Sama yang Menyebabkan Hilangnya Jiwa Orang Lain Studi Kasus di Pengadilan Negeri Binjai

Pembahasan ini sekitar telaah hukum tentang tindak pidana kekerasan dan dilakukan secara bersama-sama dan menyebabkan hilangnyn nyawa orang lain dengan mengadakan penelitian pada Pengadilan Negeri Binja

PELAKSANAAN PEMBELAJARAN JARAK JAUH (PJJ) DI TENGAH PANDEMI COVID- 19 PADA MATA PELAJARAN BIOLOGI KELAS X SMA NEGERI 2 MEDAN TP. 2020/2021

This research is a descriptive study which aims to obtain an overview of the implementation of distance learning (PJJ) in the middle of the Covid-19 pandemic in biology subject in Class X SMA Negeri 2 Medan TP. 2020/2021. The research subjects were students of class X. The research instruments were interviews with the teacher and giving questionnaires to students. The results showed that: Teachers and students of Class X SMA Negeri 2 Medan TP. 2020/2021 has implemented Distance Learning (PJJ). Students carry out PJJ every day, an average of 5-6 hours per day. Students take online classes provided by the teacher, namely Google Classroom, interact via video conference (zoom cloud meeting), Instagram, group chat (telegram, whatsapp), as well as through other online learning applications. Students think they can still understand the learning material, it's fun, it's easy to get learning resources, and can still concentrate. However, some students complained that they could not ask directly to the teacher or friends, and were bored.

Links between particle surface hardening and rehydration impairment during micellar casein powder storage

Storage is an unavoidable critical phase regarding dairy powder reconstitution abilities, particularly for high casein content powders, which generally present a poor rehydration behavior. The ability of micellar casein powders to completely rehydrate can thus be particularly affected by storage time and temperature. To implement best practices for the optimization of storage conditions, understanding changes occurring is a crucial point. For the first time, biophysical techniques were used to investigate powder surface at the nanoscale. Atomic force microscopy revealed that particle surface became rougher during storage, associated with the formation of hollow zones (around 500 nm) holes when stored for 10 months at 40 °C. Mechanical properties of micellar casein particle surface during powder storage was quantified using AFM nanoindentation. Spatially-resolved force/indentation curves evidenced a significant stiffer surface for aged powder (Young modulus of ∼20 GPa) in comparison with the fresh one (∼0.2 GPa). These findings were fully consistent with the formation of a crust at the powder surface observed by high-resolution field-emission scanning electron microscopy during powder rehydration. Finally, alterations of the rehydration process can be related to modifications occurring at the particle surface during storage

Cluster Dynamics of Planetary Waves

The dynamics of nonlinear atmospheric planetary waves is determined by a small number of independent wave clusters consisting of a few connected resonant triads. We classified the different types of connections between neighboring triads that determine the general dynamics of a cluster. Each connection type corresponds to substantially different scenarios of energy flux among the modes. The general approach can be applied directly to various mesoscopic systems with 3-mode interactions, encountered in hydrodynamics, astronomy, plasma physics, chemistry, medicine, etc.Comment: 6 pages, 3 figs, EPL, publishe

Wind-forced modulations of gravity waves

International audienceThe effect of wind on modulational instability of gravity waves is presented. A forced nonlinear Schödinger equation that governs the evolution in deep water of weakly nonlinear packets of surface gravity waves under wind forcing is derived. Stokes waves are shown to grow exponentially following Miles' linear mechanism, while modulational instability becomes explosive. These analytical results are completed by numerical simulations and experiments showing the amplification of modulations by wind. Therefore, we suggest that wind boosts the formation of rogue waves

Pengaruh Model Pembelajaran Self Directed Learning Terhadap Peningkatan Kualitas Perkuliahan Fisiologi Tumbuhan Di Program Studi Pendidikan Biologi STKIP Riama Medan

This research aims to determine the effect of the Self Directed Learning (SDL) model on improving the quality of plant physiology lectures in the Biology Education Study Program STKIP Riama Medan. The populations are students of Biology Education Study Program TA. 2013/2014 which is 20 people. The sample of the research were all members of the population in this research. The method used in this research is descriptive method with purposive sampling technique. Based on the results of the study, it is known that students have applied the Self Directed Learning (SDL) learning model with high (63%). Learning evaluation results also increased by 15% from 60% to 75%. Self Directed Learning (SDL) model is very influential on improving the quality of Plant Physiology lectures in Biology Education Study Program STKIP Riama Medan

Morphological and Physical Analysis of Natural Phospholipids-Based Biomembranes

Background: Liposomes are currently an important part of biological, pharmaceutical, medical and nutritional research, as they are considered to be among the most effective carriers for the introduction of various types of bioactive agents into target cells. Scope of Review In this work, we study the lipid organization and mechanical properties of biomembranes made of marine and plant phospholipids. Membranes based on phospholipids extracted from rapeseed and salmon are studied in the form of liposome and as supported lipid bilayer. Dioleylphosphatidylcholine (DOPC) and dipalmitoylphosphatidylcholine (DPPC) are used as references to determine the lipid organization of marine and plant phospholipid based membranes. Atomic force microscopy (AFM) imaging and force spectroscopy measurements are performed to investigate the membranes' topography at the micrometer scale and to determine their mechanical properties. Major Conclusions The mechanical properties of the membranes are correlated to the fatty acid composition, the morphology, the electrophoretic mobility and the membrane fluidity. Thus, soft and homogeneous mechanical properties are evidenced for salmon phospholipids membrane containing various polyunsaturated fatty acids. Besides, phase segregation in rapeseed membrane and more important mechanical properties were emphasized for this type of membranes by contrast to the marine phospholipids based membranes. General Significance This paper provides new information on the nanomechanical and morphological properties of membrane in form of liposome by AFM. The originality of this work is to characterize the physico-chemical properties of the nanoliposome from the natural sources containing various fatty acids and polar head

Tinjauan Perspektif Sosiologi Terhadap Aspek Penting Yang Memiliki Hubungan Terhadap Efetivitas Penegakan Hukum Di Masyarakat

Hukum merupakan sesuatu yang abstrak, karena tidak dapat dilihat atau diraba, tetapi dapat dirasakan keberadaannya. Hal ini karena hak bukanlah objek, melainkan tindakan (setelah dilaksanakan). Untuk mempelajari hal ini, kita harus memperhatikan keberadaan hukum melalui efektifitas hukum dalam masyarakat. Memperdebatkan efektivitas hukum di tengah masyarakat berarti membicarakan efektivitas atau penegakan hukum dalam mengatur dan/atau menegakkan kepatuhan terhadap hukum. Jadi dapat dipastikan ada faktor-faktor yang mempengaruhi efektifitas hukum. Kemudian ada juga  faktor-faktor yang mempengaruhi apakah hukum itu benar-benar berfungsi  dalam masyarakat. Dalam penelitian ini digunakan jenis penelitian normatif hukum yang menghubungkan topik penelitian dengan  topik utama  penelitian ini. Hasil  penelitian ini menunjukkan bahwa efektivitas penegakan hukum di masyarakat dipengaruhi oleh beberapa faktor, yaitu aturan hukum (peraturan), lembaga kepolisian, tempat atau fasilitas, dan kesadaran masyarakat itu sendiri

The surface properties of milk fat globules govern their interactions with the caseins: Role of homogenization and pH probed by AFM force spectroscopy

The surface of milk fat globules consists of a biological membrane rich in polar lipids and glycoproteins. However, high shear stress applied upon homogenization disrupts the membrane and leads to the adsorption of casein micelles, as the major protein fraction of milk. These changes in the interface properties could affect the interactions between native or homogenized milk fat globules and the surrounding protein matrix, at neutral pH and upon acidification. In this study, macroscale rheometry, microscopic observations, nanoscale AFM-based force spectroscopy and physico-chemical analysis were combined to examine the interfacial composition and structure of milk fat globules and to evaluate their interactions with casein micelles. We showed that the surface properties of milk fat globules (biological membrane vs. caseins) and pH govern their interactions with casein micelles. The adhesion between individual fat globules and casein micelles was higher upon homogenization, especially at acid pH where the work of adhesion increased from 3.3 x 10-18 to 14 x 10-18 J for native and homogenized fat globules, respectively. Consequently, casein-coated homogenized fat globules yield stiffer milk acid gels. These findings cast light on the importance of colloidal particle’s surface properties and pH on their connectivity with the surrounding matrix, which modulates the bulk microstructure and rheological properties with potential functional consequences, such as milk lipid digestion