Persepsi Mahasiswa Tentang Mutu Pelayanan Pendidikan dan Motivasi Mengikuti Proses Belajar Mengajar

Fenomena yang terjadi di Akper Ngudi Waluyo Ungaran menunjukkan ada kecenderunganprestasi belajar siswa masih jauh dari standart, yang disebabkan oleh kurangnya motivasibelajar, terlihat dari sikap siswa yang kurang menyenangi suatu mata ajar tertentu, seringdatang terlambat, tidak mengerjakan tugas yang diberikan dosen, acuh tak acuh pada saatproses pembelajaran, mahasiswa belajar tanpa persiapan dan kurang aktif dalam pembelajaran.Diprediksikan, berkaitan dengan persepsi mahasiswa tentang mutu pelayanan pendidikan yangkurang baik. Metode penelitian yang digunakan adalah explanatory research. Data diambildengan dengan cara pengisian kuesioner oleh mahasiswa, kemudian dilakukan triangulasi datadengan melakukan wawancara dengan pudir I bidang akademik, ka.sub.bag administrasi,laboratorium, perpustakaan dan bimbingan konseling. Data yang diperoleh dianalisismenggunakan analisis regresi. Hasil penelitian menunjukkan motivasi mahasiswa untukmengikuti proses belajar mengajar dalam kategori baik sebanyak 78,7%, variabel yang palingdominan yang menjadi prediktor terjadinya peningkatan motivasi adalah mutu pelayanan dosen.Kata Kunci : Persepsi, mutu pelayanan pendidikan, motivasi, proses belajar mengajar the student's perception about the the quality of education service and the motivation's tojoin studying process at Ngudi Waluyo Nursing academy; Phenomenon that happened atNgudi Waluyo Nursing Academy show the tendency of the students's achievement was understandard. It was caused by the student's motivation to study was still low, could be seen fromtheir attitude that dislike in one of their subject, often came late, didn't do their work, didn'tpay attention in class, didn't prepare and wasn't active in their learning. It's predicted anyrelation with the student's perception about the quality of education service wasn't good.There were two variable: the student's perception about the quality of education service asindependent variable and the student's motivation to study as dependant varibale. The researchmethod was explanatory research. The date used quesionare and then done triagulation bydeep interview with the first vice of director academic affair, the head of academicadminitration, the head of laboratory, librarian and coucellor. Analysed data used regressionanalyze. The result show that the student's motivation to join studying process in good categorywas 78,7 %, dominant variable as predictor the occurance of increasing motivation was thequality of the lecturer service.Key words : perception, quality of education service, motivation, studying process

Colloidal Silver Nanoparticles Preparation Using Various Types of Reducing Agent as Antibacterial Material

Silver nanoparticles are known as a good antibacterial activity and can be utilized in daily life. There are severalmethods for synthesis of silver nanoparticles, and one of the most widely used is by using chemical reduction. In this study colloidal silver nanoparticles were synthesized by using a variation of precursor concentration of AgNO3 250, 500, and 750 ppm, as well as variation types of reducing agent which are ascorbic acid, citric acid, and trisodium citrate with Polyvinyl Alcohol as stabilizer. The antibacterial test were conducted by the disc diffusion method. The result of this study showed that the sample with a 250 ppm of precursor AgNO3 with citric acid as reducing agents produce the optimum antibacterial activity with the same inhibition area to Staphylococcus aureus and Eschericia coli. The inhibition diameter is equal to the standard solution which is 8 mm at the same concentration. Analytical results obtained from the spectrophotometer gave maximum wavelength (λmax) at 421 nm. Based on the analysis of particle size, it is obtained that the average particle size is 55 nm with a refractive index of 1.3328, the viscosity of colloidal silver nanoparticle 0.8878 and the polydispersity index of 0.3

X ray emission spectroscopy of bulk liquid water in no man s land

The structure of bulk liquid water was recently probed by x ray scattering below the temperature limit of homogeneous nucleation TH of amp; 8764;232 K [J. A. Sellberg et al., Nature 510, 381 384 2014 ]. Here, we utilize a similar approach to study the structure of bulk liquid water below TH using oxygen K edge x ray emission spectroscopy XES . Based on previous XES experiments [T. Tokushima et al., Chem. Phys. Lett. 460, 387 400 2008 ] at higher temperatures, we expected the ratio of the 1b1 amp; 8242; and 1b1 amp; 8242; amp; 8242; peaks associated with the lone pair orbital in water to change strongly upon deep supercooling as the coordination of the hydrogen H bonds becomes tetrahedral. In contrast, we observed only minor changes in the lone pair spectral region, challenging an interpretation in terms of two interconverting species. A number of alternative hypotheses to explain the results are put forward and discussed. Although the spectra can be explained by various contributions from these hypotheses, we here emphasize the interpretation that the line shape of each component changes dramatically when approaching lower temperatures, where, in particular, the peak assigned to the proposed disordered component would become more symmetrical as vibrational interference becomes more importan

X ray absorption spectroscopy using a self seeded soft X ray free electron laser

X ray free electron lasers XFELs enable unprecedented new ways to study the electronic structure and dynamics of transition metal systems. L edge absorption spectroscopy is a powerful technique for such studies and the feasibility of this method at XFELs for solutions and solids has been demonstrated. However, the required x ray bandwidth is an order of magnitude narrower than that of self amplified spontaneous emission SASE , and additional monochromatization is needed. Here we compare L edge x ray absorption spectroscopy XAS of a prototypical transition metal system based on monochromatizing the SASE radiation of the linac coherent light source LCLS with a new technique based on self seeding of LCLS. We demonstrate how L edge XAS can be performed using the self seeding scheme without the need of an additional beam line monochromator. We show how the spectral shape and pulse energy depend on the undulator setup and how this affects the x ray spectroscopy measurement

Anomalous behavior of the homogeneous ice nucleation rate in "no-man's land"

We present an analysis of ice nucleation kinetics from near-ambient pressure water as temperature decreases below the homogeneous limit TH by cooling micrometer-sized droplets (microdroplets) evaporatively at 103104 K/s and probing the structure ultrafast using femtosecond pulses from the Linac Coherent Light Source (LCLS) free-electron X-ray laser. Below 232 K, we observed a slower nucleation rate increase with decreasing temperature than anticipated from previous measurements, which we suggest is due to the rapid decrease in waters diffusivity. This is consistent with earlier findings that microdroplets do not crystallize at <227 K, but vitrify at cooling rates of 106107 K/s. We also hypothesize that the slower increase in the nucleation rate is connected with the proposed fragile-to-strong transition anomaly in water

Monomer, Clusters, Liquid: An Integrated Spectroscopic Study of Methanol Condensation

We have combined static pressure, spectroscopic temperature, Fourier transform infrared spectroscopy (FTIR), and small angle X-ray scattering (SAXS) measurements to develop a detailed picture of methanol condensing from a dilute vapor-carrier gas mixture under the highly supersaturated conditions present in a supersonic nozzle. In our experiments, methanol condensation can be divided into three stages as the gas mixture expands in the nozzle. In the first stage, as the temperature decreases rapidly, small methanol n-mers (clusters) form, increase in concentration, and evolve in size. In the second stage, the temperature decreases more slowly, and the n-mer concentrations continue to rise. Thermodynamic and FTIR experiments cannot, however, definitively establish if the average cluster size is constant or if it continues to increase. Finally, when the vapor becomes supersaturated enough, liquid droplets form via nucleation and growth, consuming more monomer and reducing the concentration of clusters. At the point where liquid first appears, cluster formation has already consumed up to 30% of the monomer. This is significantly more than is predicted by a model that describes the vapor phase as an equilibrium mixture of methanol monomer, dimer, and tetramer. An energy balance suggests that a significant fraction of the cluster population is larger than the tetramer, while preliminary SAXS measurements suggest that these clusters contain, on average, 6 monomers

Methods development for diffraction and spectroscopy studies of metalloenzymes at X ray free electron lasers

X-ray free-electron lasers (XFELs) open up new possibilities for X-ray crystallographic and spectroscopic studies of radiation-sensitive biological samples under close to physiological conditions. To facilitate these new X-ray sources, tailored experimental methods and data-processing protocols have to be developed. The highly radiation-sensitive photosystem II (PSII) protein complex is a prime target for XFEL experiments aiming to study the mechanism of light-induced water oxidation taking place at a Mn cluster in this complex. We developed a set of tools for the study of PSII at XFELs, including a new liquid jet based on electrofocusing, an energy dispersive von Hamos X-ray emission spectrometer for the hard X-ray range and a high-throughput soft X-ray spectrometer based on a reflection zone plate. While our immediate focus is on PSII, the methods we describe here are applicable to a wide range of metalloenzymes. These experimental developments were complemented by a new software suite, cctbx.xfel. This software suite allows for near-real-time monitoring of the experimental parameters and detector signals and the detailed analysis of the diffraction and spectroscopy data collected by us at the Linac Coherent Light Source, taking into account the specific characteristics of data measured at an XFEL

Reabsorption of Soft X Ray Emission at High X Ray Free Electron Laser Fluences

We report on oxygen K edge soft x ray emission spectroscopy from a liquid water jet at the Linac Coherent Light Source. We observe significant changes in the spectral content when tuning over a wide range of incident x ray fluences. In addition the total emission yield decreases at high fluences. These modifications result from reabsorption of x ray emission by valence excited molecules generated by the Auger cascade. Our observations have major implications for future x ray emission studies at intense x ray sources. We highlight the importance of the x ray pulse length with respect to the core hole lifetim