Can Heavy WIMPs Be Captured by the Earth?

If weakly interacting massive particles (WIMPs) in bound solar orbits are systematically driven into the Sun by solar-system resonances (as Farinella et al. have shown is the case for many Earth-crossing asteroids), then the capture of high-mass WIMPs by the Earth would be affected dramatically because high-mass WIMPs are captured primarily from bound orbits. WIMP capture would be eliminated for M_x>630 GeV and would be highly suppressed for M_x>~150 GeV. Annihilation of captured WIMPs and anti-WIMPs is expected to give rise to neutrinos coming from the Earth's center. The absence of such a neutrino signal has been used to place limits on WIMP parameters. At present, one does not know if typical WIMP orbits are in fact affected by these resonances. Until this question is investigated and resolved, one must (conservatively) assume that they are. Hence, limits on high-mass WIMP parameters are significantly weaker than previously believed.Comment: 8 pages + 1 figure. Submitted to Ap

Characterization of LUSI Mud as Geopolymer Raw Material

The mud of mud volcano samples were collected from an eruption site named ‘LUSI’ (Lumpur “mud” –Sidoarjo), East Java, Indonesia for characterization. Analysis showed that, the major constituents of mud are SiO2 and Al2O3 which are higher than those in fly ash. The particle of mud has a flake-shaped particle and the overall particle size is dominated by particles between 2.5μm – 25.0μm. The results of XRD shows that mud of mud volcano have a characteristic of structurally disordered compounds, and a set of peaks corresponding to minor crystalline phases such as quartz, feldspars, and kaolinite. FTIR adsorption bands of the raw material of mud have the chemical bonding between bands 1-5

Study of Bollard Pull Harbour Tug: Focuses on Stability and Straight Movement.

Method of design and analysis of bollard pull harbour tug focuses in its stability and straight movement. Research includes a brief review of general description of bollard pull harbour tug, tug boat functions, tug boat characteristics, functions, operation modes, requirements for tug boats, stability standard and factor affecting stability, stability requirements, displacement and buoyancy, fundamental of design and a very last, fundamental of analysis. This research also discuss about the methodology to implement the design and analysis to measure the stability and movement of the tug boat. The purpose of design modelling is to identify the error of the existing design and to redesign to eliminate or reduce errors. The error consists of the hull structure and skeg design. However to redesign the hull and skeg must be done during design stage. For this report, it will discuss only the basis of the design methodology. The analysis of the stability and straight movement of the bollard pull harbour tug are using software analysis. SolidWorks and ANSYS are the proposed analysis software that will implement for this thesis. The analysis of the tug boat is study on static and dynamic analysis that discuss about finite element analysis and hydrodynamic analysis. Dynamic analysis is important part because it deals with how the tug boat moving in a stable and balanced during its operation

Flower pigment analysis of Melastoma malabathricum

Anthocyanin is among the permitted pigments that can be used for food colourant and having been considered a potential replacement for synthetic dyes. The objective of this study is to analyse the colour pigment, anthocyanin, that can be detected in flower and their stability in extracted form. All the analysed results will be used in the next study for the production of new food colouring material. From the observation, it shows that S3 flower developmental stage contains the highest anthocyanin concentration. Simple linear regression method was used to find the significant level correlating the anthocyanin concentration and storage time. Throughout the whole experiments, the extracted anthocyanin contents are quite stable. The graphs show a small degradation rate in the anthocyanin total concentration, except for the extracts that were exposed to the light where the degradation level reached more than 50%. At different pH values, the anthocyanin concentration decreased and the colour faded at higher pH. Extracts that were stored at high temperatures (31°C) showed higher degradation levels compared to the one kept at lower temperatures (25°C). From the study we find that the suitable storage condition for coloured anthocyanin pigments is in acidic solution (pH 0.5 and 1.0) kept in the dark and at low temperature (4°C).Keywords: Anthocyanin, colourant, pigment, Melastoma malabathricu

Noise from a Jet Discharging Into a Duct and Its Suppression

The present study addresses unwanted high intensity noise sometimes encountered in engine test facilities. A simplified model-scale experiment is conducted for a circular jet discharging into a cylindrical duct. For the given configuration the unwanted noise is found to be primarily due to the duct resonance modes excited by the jet. When the "preferred mode". frequency of the jet matches a duct resonant frequency there can be a locked-in "super resonance". accompanied by a high intensity tone. However, even in the absence of a locked-in resonance, high levels of unwanted noise may occur due to the duct modes excited simply by broadband disturbances of the jet. Various methods for suppression of the noise are explored. Tabs placed on the ends of the duct are found ineffective; so are longitudinal fins placed inside the duct. A rod inserted perpendicular to the flow at different axial locations is also found ineffective; however, when there is a super resonance it is effective in suppressing the tone. By far the best suppression is achieved by a wire-mesh screen placed at the downstream end of the duct; placing it on the upstream end also works, however, there is some penalty at high frequencies due to impingement noise. The screen not only eliminates any super resonance but also the duct mode spectral peaks in the absence of such resonance. Apparently it works by dampening the velocity fluctuations at the pressure node and thereby weakening the resonance condition, for the simplified configuration under consideration

Konektivitas Struktur Vegetasi Mangrove dengan Keasaman dan Bahan Organik Total pada Sedimen di Kecamatan Wonomulyo Kabupaten Polewali Mandar

Mangrove forest ecosystem is one of coastal ecosystem having significant roles as habitat for diverse organisms, as barrier ofseawater intrusion, sediment trap, protection to the shore from abrasion and as nutrient supplier in form of detritus to othercoastal ecosystems i.e. seagrass beds and coral reefs. However, mangrove has experienced degradation caused by natural andanthropogenic factors. One effort to recover the mangrove\u27s function is by rehabilitating this ecosystem through controllingits total organic matter and the soil acidity (pH). Therefore, it is urgent to conduct a study in order to know the relationshipbetween mangrove growth and the total organic matter and pH. The study was conducted May 2014. The study area was locatedin Mampie, Wonomulyo Sub-District, Polewali Mandar Regency. The benefit gained from this study was giving information ondissolved organic matter related to the mangrove rehabilitation. Method used was field survey by determining three observationstations with different environmental condition. Data were presented as tables and pictures. Results of this study indicated thatincreasing of mangrove density and coverage was followed by the increasing of total organic matter percentage within sedimentat station II. Whereas, the higher the acidity, the lower the content of the total organic matter within sediment was found inStation I. In contrast, the organic matter within sediment was high when the acidity value decrease was observed at Station III

Design of Microcontroller-Based Portable Instrument for Measuring P-Wave Speed in Impact-Echo Method

Impact-echo method is widely used for non-destructive testing on concrete evaluation. One of the procedures of this method is determining P-wave speed by measuring travel time of P-wave ( between two transducers. For this purpose, a microcontroller-based portable instrument is developed. This research proposes a PIC microcontroller routine using interrupt-on-change and timer0 features. On concrete, impact waves reach the first accelerometer and will interrupt the main routine and start the timer0. When the waves reach the second accelerometer, the timer0 will be stopped. The value of the timer represents the travel time of P-wave. Therefore, the P-wave speed can be calculated. The routine is verified using controlled signal generated by internal PIC. The accurate result of the travel time measurements is presented. )t