244 research outputs found
On the spatial and temporal coherence of wireless vehicular short range channels
No full textWe consider spatial and temporal coherence of the vehicle–to–vehicle (V2V) wireless communication channel with focus on a suburban residential highway. The dominant reflectors in such an environment are vehicles passing in the adjacent lane and houses
along the road. Instead of treating the reflectors as point targets, the V2V short range propagation environment requires partitioning of the illuminated reflector side into
sufficiently small tiles. The channel transfer function is obtained as a superposition of specular reflections from the tiles, the line–of–sight (LOS) component, and the ground reflection. The tile size is selected to ensure that the ratio of the tile area to the tile–to–receiver distance satisfies the far field conditions. The reflected power is described by the tile radar cross section (RCS). The bistatic physical optics RCS model is adapted to account for the tile’s orientation with respect to the ray geometry. We apply the superposition model to the numerical analysis of two general scenarios
for a 22MHz channel in the 2.4GHz band. The first scenario considers a single vehicle reflector passing in the lane adjacent to the V2V communication pair. Both the vector network analyzer (VNA) experiments and the tiling model analysis illustrate that repositioning of the reflector, the transmitter, or the receiver by a few centimeters results in change of the signal power by several decibels. The second scenario analysis characterizes the channel coherence statistics for the
suburban residential highway. We consider the V2V single lane LOS and non–LOS geometries, where in the latter the receiver is shadowed by a large vehicle. The reflectors are both houses and vehicles passing in the opposite direction. The measure of channel coherence is the normalized spatial covariance calculated by correlating transfer functions corresponding to feasible receiver position pairs and performing spatial smoothing. The area of feasible receiver positions is divided into contiguous squares
whose size ensures wide sense quasi–stationarity within the square. Irrespective of direction the correlation remains high and a typical sedan roof usually does not provide sufficient spacing to obtain average inter–antenna correlation lower than 0.5. The upper bound on coherence time extends over the transmission time of multiple packets for systems in the considered band, and does not allow for usable time diversity.Ph.D.Includes bibliographical referencesIncludes vitaby Haris Krem
Pengembangan Model Latihan Imagery untuk Meningkatkan Keterampialn Lay up Shoot pada Peserta Ekstrakurikuler Bola basket SMA di Kabupaten Batang, Jawa Tengah
No full textPenelitian ini bertujuan untuk: (1) menghasilkan sebuah model latihan imagery untuk meningkatkan keterampilan lay up shoot, dan (2) mengetahui keefektifan model yang dikembangkan pada peningkatan keterampilan lay up shoot oleh peserta ekstrakulikuler bola basket SMA di Kabupaten Batang, Jawa Tengah.
Penelitian pengembangan ini menggunakan prosedur penelitian yang mengacu pada pemaparan teori Sugiyono yang terdiri dari 10 langkah pelaksanaan yaitu: (1) studi pendahuluan dan pengumpulan data; (2) perencanaan tujuan penelitian, dana, dan waktu; (3) pengembangan produk awal, (4) ujicoba awal subjek yang terbatas; (5) revisi untuk menyusun produk utama; (6) uji coba lapangan utama dengan subjek yang lebih luas; (7) revisi untuk menyusun produk operasional; (8) uji coba keefektifan produk, (9) revisi produk final; dan (10) diseminasi produk. Pengembangan model dilakukan di SMA 1 Wonotunggal Batang, Jawa Tengah yang melibatkan 13 siswa pada uji coba skala kecil. Uji coba skala besar dilakukan di SMA 1 Subah Batang, Jawa Tengah dan SMA 1 Batang yang melibatkan 27 siswa. Uji keefektifan implementasi produk akhir dilakukan di SMA 2 Batang menggunakan metode eksperimen. Diseminasi produk melalui jurnal penelitian dan seminar. Pengumpulan data menggunakan pedoman wawancara, lembar validasi ahli, dan lembar observasi implementasi produk. Teknik analisis: validitas dan reabilitas data menggunakan hitungan content validity ratio (CVR) dan uji produk menggunakan hitungan P = : N x 100% dengan standar klasifikasi kelayakan.
Hasil penelitian ini menunjukkan bahwa: (1) produk yang dihasilkan berupa buku panduan latihan imagery untuk meningkatkan latihan lay up shoot, (2) model yang dikembangkan layak dan ada perbedaan antara skor lay up shoot dalam pretest dengan skor lay up shoot dalam posttest pada kelompok eksperimen dan antara skor lay up shoot dalam posttest pada kelompok eksperimen dengan skor lay up shoot dalam posttest pada kelompok kontrol pada taraf signifikansi > 5%
PENJAMINAN SECARA FIDUSIA TERHADAP HAK SEWA ATAS BANGUNAN YANG BERDIRI DI ATAS TAHAH NEGARA
No full textPerkembangan Lembaga jaminan fidusia dirasakan oleh masyarakat sangat memberikan banyak manfaat kepada masyarakat itu sendiri. Hal ini semakin nampak ketika di satu sisi masyarakat khususnya sangat membutuhkan pinjaman modal guna mengembangkan usahanya, sedangkan di sisi lainnya mereka tidak dapat menyerahkan benda yang bersangkutan untuk dijadikan sebagai jaminan kepada pihak bank. Karena hal ini secara tidak langsung dapat menghentikan usaha calon debitur yang bersangkutan. Jika benda yang dijadikan jaminan hutang tersebut berupa hak sewa atas bangunan yang berdiri di atas tanah negara atau tanah orang lain, apabila dilihat dalam UU No.4 Tahun 1996 tentang Hak Tanggungan hanya menentukan tanah hak milik, hak guna usaha, dan hak guna bangunan saja yang dapat dibebani dengan menggunakan hak tanggungan, di luar itu terhadap hak sewa hanya bisa dibebani dengan fidusia.
Permasalahan yang diulas dalam skripsi ini adalah latar belakang pihak bank menerima hak sewa atas bangunan sebagai jaminan fidusia, proses pembebanan fidusia terhadap hak sewa atas bangunan dan cara penyelesaiannya bila terjadi kredit macet. Sedangkan tujuan daripada penulisan skripsi ini adalah untuk mengkaji dan menganalisa permasalahan tersebut di atas.
Hak sewa atas bangunan pada dasarnya dapat dijadikan sebagai jaminan hutang secara fidusia dalam praktek perbankan ialah mendasarkan pada bunyi pasal 4 ayat Undang-Undang No. 5 Tahun 1960 tentang Hak Tanggungan dimana hak atas tanah yang dapat dibebani hak tanggungan berupa hak milik, hak guna usaha dan hak guna bangunan. Sehingga selain hak atas tanah di atas hak sewa maupun hak pakai kecuali hak pakai atas tanah negara hanya bisa dibebani secara fidusia. Untuk pembebanan jaminan sendiri melihat ketentuan dalam pasal 5 ayat (1) Undang-Undang No. 42 Tahun 1999 tentang Jaminan Fidusia harus dibuat dalam bentuk akta notaris. Sedangkan untuk menjamin kepastian hukumnya jaminan tersebut harus didaftarkan di Kantor Pendaftaran Fidusia (pasal 11 ayat 1, 2). Sedangkan berkaitan dengan upaya penyelesaian kredit macet oleh pihak bank dalam rangka pengembalian dana kredit dari debitur yang lalai, dalam pasal 29 ayat mengatur eksekusi terhadap benda yang menjadi obyek jaminan fidusia melalui 3 cara. yaitu: pelaksanaan titel eksekutorial, penjualan benda jaminan secara parate eksekusi lewat pelelangan umum dan penjualan di bawah tangan.
Lembaga jaminan fidusia mengatur bahwasanya obyek jaminan fidusia harus berada dalam penguasaan pihak debitur. Hal ini tidak menutup kemungkinan seorang debitur yang rnempunyai itikad tidak baik menyalahgunakan obyek jaminan tersebut. misalnya dengan melakukan pembebanan ulang terhadap obyek yang sama. Sehingga untuk menjamin kepastian hukum terhadap benda jaminan dan untuk melindungi pihak kreditur itu sendiri. pihak bank harus segera mendaftarkannya di Kantor Pendaftaran Fidusia
The Effects of LTAD-Based Programming on Fundamental Skills and Physical Abilities of Basketball Players Aged 11-12 Years
No full textStudy purpose. The purpose of this research is to determine the effect of LTAD-based programming on the physical abilities and fundamental skills of basketball players aged 11-12 years.
Materials and methods. The research method used was an experimental one-group pretest-posttest design. The study participants included 50 basketball players, 25 males and 25 females, weighing ±50–70 kg and standing 159–172 cm tall.The instruments used consisted of a multistage fitness test, 30-meter sprint, Illinois run, layup, shooting under the ring, and free throw. Data was gathered by observation and testing. The data was analyzed descriptively using Wilcoxon and Mann-Whitney tests, which were aided by SPSS version 23.
Results. The results of the male and female groups’ pretest-posttest showed that the Asymp.sig (2-tailed) values for the aspects of endurance, speed, agility, layup, shooting under the ring, and free throw were 0.0000.05, only for shooting under the ring the Asymp.sig (2-tailed) value was 0.008 <0.05.
Conclusions. The male and female groups’ posttest results were better than the pretest results before LTAD-based programming. The majority of the posttest comparisons between males and females revealed no significant differences. This suggests that both the male and female groups improved after receiving LTAD-based programming
Explosive indentation study of B4C-TiAlx composites fabricated by the dipping exothermic reaction process
No full textThe aim of this study is to fabricate a high volume fraction B4C-reinforced intermetallic matrix composite by the dipping exothermic reaction process and investigate the shock impact damage response of composites by explosive indentation experiment. It has been shown that the final microstructure of the dipping exothermic reaction process-fabricated composite can be tailored by treatment of the constituent powders and post heat treatment. The hardness and impact damage resistance of the fabricated composites were evaluated.This work is supported by grants (No. N62649-03-0007) from AROFE(US Army
Research Office Far-East). The author thanks Drs. J. W. McCauley of ARL, Sean Yu and
R. Olesinskiof AROFE
Increasing the Performance of Passive Communication with Ambient Light
No full textMost wireless communication technologies have been using the Radio Frequency (RF) spectrum for decades. Due to the popularity of the Internet of Things (IoT), the RF spectrum has started to become densely populated. Researchers have begun to explore other bands of the electromagnetic spectrum that can be utilized as a communication media. One of the promising choices is the visible light spectrum.Visible Light Communication (VLC) refers to the wireless communication technology that utilizes the visible light spectrum. This spectrum is thousands of times wider than the Radio Frequency (RF) spectrum and is license-free. In VLC, data is transmitted by turning a light source on and off. However, not every light source can be controlled. Passive light sources such as the sun provide an immense amount of light that can be used for wireless communication if we can develop ways to modulate them. One of the researches that use ambient light to create a wireless link is LuxLink. LuxLink uses liquid crystal shutters to control passive light sources and provides low energy, reliable, and flicker-free (safe) communication. This thesis addresses several problems that the current LuxLink system has.We present LuxLink+, an extension of LuxLink that provides two main improvements. Firstly, the data rate of the system is relatively low (80~bps). To increase the data rate, we provide a thorough analysis of the system’s bandwidth. Afterward, we modify the modulation technique, which increases the data rate to 1000~bps at a range of 1.5~m.Secondly, the system has a static data rate, which means that the system cannot adapt its data rate to changes in the environment. We implement a rate adaptation algorithm that can change its data rate accordingly. LuxLink+ improves the average throughput of the system by up to 85 percent compared to LuxLink.Electrical Engineering | Embedded System
Performance investigation of an integrated wind energy system for co-generation of power and hydrogen
No full textIn this paper, a wind turbine energy system is integrated with a hydrogen fuel cell and proton exchange membrane electrolyzer to provide electricity and heat to a community of households. Different cases for varying wind speeds are taken into consideration. Wind turbines meet the electricity demand when there is sufficient wind speed available. During high wind speeds, the excess electricity generated is supplied to the electrolyzer to produce hydrogen which is stored in a storage tank. It is later utilized in the fuel cell to provide electricity during periods of low wind speeds to overcome the shortage of electricity supply. The fuel cell operates during high demand conditions and provides electricity and heat for the residential application. The overall efficiency of the system is calculated at different wind speeds. The overall energy and exergy efficiencies at a wind speed 5 m/s are then found to be 20.2% and 21.2% respectively
Multigeneration system exergy analysis and thermal management of an industrial glassmaking process linked with a Cu–Cl cycle for hydrogen production
No full textA multigeneration system for hydrogen production linked with a glassmaking process via thermal management is examined in this study. The exhaust gas is interconnected with a Rankine cycle and the copper-chlorine (Cu–Cl) cycle for hydrogen production. The present system consists of a steam Rankine cycle, Cu–Cl cycle with multistage compression, double-stage organic Rankine cycle, and multi-effect desalination system. A Cu–Cl cycle based on the four-step model is employed with the proposed system. The useful system outputs are electricity, hydrogen, and fresh water. The simulation software packages utilized in the analysis and modeling are Engineering Equation Solver and Aspen Plus. The energy efficiency of the overall system is 36.5% while 38.1% is the exergy efficiency. The parametric studies are conducted to investigate the system performance. In addition, the effects of exhaust gas variables, such as flow rate, temperature, and pressure are examined to investigate the system performance
Level Aktivitas Fisik dan Pola Hidup Sehat Siswa di Masa Pandemi Covid-19
No full textTujuan dari penelitian ini adalah untuk mengetahui level aktivitas fisik dan pola hidup sehat siswa SMPN 5 Kota Bima pada masa pandemi covid-19. Rancangan penelitian ini menggunakan metode survey dengan teknik pengumpulan data menggunakan instrumen tes berupa angket. Populasi dalam penelitian adalah seluruh siswa kelas VII di SMPN 5 Kota Bima yang berjumlah 59 siswa, dengan teknik sampling menggunakan studi populasi. Instrumen level aktivitas fisik siswa diperoleh dari pengisian angket Physical Activity Questionnaire-Adolescents (PAQ-A), sedangkan instrumen pola hidup sehat siswa diadaptasi dari penelitian Rohman & Nurhayati (2021). Teknik analisis data yang digunakan dalam penelitian ini adalah teknik statistik deskriptif dengan persentase. Hasil penelitian level aktivitas fisik siswa kelas VII SMPN 5 Kota Bima sebagian besar berkategori sedang sebesar 50,85%, kategori rendah sebesar 42,37%, pada kategori tinggi sebesar 6,78%, pada kategori sangat rendah sebesar 0% dan pada kategori sangat tinggi 0%. Sedangkan, hasil penelitian pola hidup sehat siswa kelas VII SMPN 5 Kota Bima, sebagai berikut; kategori sangat kurang sebesar 10,17%, kategori kurang baik sebesar 25,42%, pada kategori cukup baik sebesar 25,42%, pada kategori baik sebesar 23,73% dan pada kategori sangat baik 15,25%.
Level of Physical Activity and Healthy Lifestyles Students During the Covid-19 Pandemic
Abstract
The purpose of this study was to determine the level of physical activity and healthy lifestyle of SMPN 5 Bima City students during the Covid-19 pandemic. The design of this study used a survey method with data collection techniques using a test instrument in the form of a questionnaire. The population in this study were all seventh grade students at SMPN 5 Bima City, totaling 59 students, with a sampling technique using a population study. The students' physical activity level instrument was obtained from filling out the Physical Activity Questionnaire-Adolescents (PAQ-A) questionnaire, while the student's healthy lifestyle instrument was adapted from research by Rohman & Nurhayati (2021). Data analysis technique used in this research is descriptive statistical technique with percentage. The results of the study on the level of physical activity of the seventh grade students of SMPN 5 Bima City were mostly in the medium category at 50.85%, in the low category by 42.37%, in the high category by 6.78%, in the very low category by 0% and in the very low category. high 0%. Meanwhile, the results of the study on healthy lifestyles for seventh grade students of SMPN 5 Bima City are as follows; in the very poor category by 10.17%, in the poor category by 25.42%, in the quite good category by 25.42%, in the good category by 23.73% and in the very good category by 15.25%
Leadership strategies for embedding sustainability and resilience in organizations with an emphasis on sustainable energy
No full textEfficient strategies to embedding sustainability in an organization are frequently linked to effective leadership. By design, changes in direction within an organization may lead to alterations in commitment or perceived significance of sustainability in organizations. While some organizational leaders are interested in embedding sustainability within a structure, other leaders believe in leaving the legacy behind and permanently influencing sustainability efforts. To confirm or dispel the underscored notion of the importance of leadership in embedding sustainability in organizations, a qualitative methodology approach to interviews, document analyses, and literature review is utilized. The research inquiry includes in-person interviews with top city staff and elected officials in a large Midwestern city and a review of the internal documents and reports. The end goal of the research is an examination of the role both elected and appointed officials have in embedding sustainability within cities, and whether a change in leadership may have an impact on continuity of sustainability implementation and
long-term viability of such policies. The paper focuses on the application of sustainable energy policies within a local government organizational structure as a mean of constructing a better understanding of leadership on sustainability implementation and embedment. While the further inquiry is needed, the research points out that an active partnership between city managers, administrators, and elected officials must be in place to support integrating sustainability from within and that sustainability thrives where exhaustive leadership support such
initiatives and efforts.Journal ArticleFinal article publishe
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