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Lead-free halide double perovskites (DPs) have attracted great attention due to their stability, nontoxicity, and good photophysical properties. Herein, environmentally friendly small-bandgap Cs 2 CuSbCl 6 and Cs 4 CuSb 2 Cl 12 DPs microcrystals (MCs) are prepared via a solvent synthesis technique. This study also reports a bottom-up synthetic protocol for obtaining evenly distributed Cs 2 CuSbCl 6 and Cs 4 CuSb 2 Cl 12 quantum dots (QDs) utilizing a modified hot injection approach. These MCs and QDs have strong absorption throughout the visible region, indicating that they could be promising light-absorbing materials as sunlight-driven photocatalysts. For the first time, the efficient sunlight-driven photocatalytic CO 2 reduction activity of these Pb-free "green" MCs and QDs has been revealed, and a product yield of 307 μmol g −1 and an electron consumption of 1053 μmol g −1 are achieved by the Cs 4 CuSb 2 Cl 12 QDs under 3 h irradiation. Our results highlight the potential of this family of materials for photocatalytic applications.

ness or usefulness of any information, apparatus, product or process disclosed, or represents that its use will not infringe privately-owned rights. Mention of any product, its manufacturer, or suppliers shall not, nor is it intended to, imply approval, disapproval, or fitness for any particular use. A royalty-free, nonexclusive right to use and disseminate same for any purpose whatsoever, is expressly reserved to the United States and the Universitv. 2/80 AbstractHadronic decays of 2' bosons produced in e+e-annihilation are ideal for testing QCD.This thesis presents a measurement of the charged-particle multiplicity distribution and the first experimental study of the ratio of cumulant to factorial moments) using hadronic 2' decays collected by the SLD experiment at SLAC. We find that this ratio, as a function of the moment-rank q, decreases sharply to a negative minimum at q = 5, which is followed by quasi-oscillations. These features are in qualitative agreement with expectations from higher-order perturbative QCD. We also present an analysis of the intermittency in rapidity phase space using the method of scaled factorial moments. We find that both parton cascade and hard-gluon radiations contribute to the growth of the moments by studying the event-shape and jet-topology dependencies. All aspects of the data appear to be reproduced reasonably well by the QCD-based Monte Carlo model. AcknowledgmentsBehind this thesis are the contributions from many people I have had the fortune of working with. I own a deep debt of gratitude to each one.Foremost, I would like to thank my advisor, Ray Frey, for his confidence six years ago in a foreign student, and his constant support and patience ever since. I have been very fortunate to be his student. His wisdom and faith has largely shaped my philosophy of life beyond physics, which I will benefit for ever.I own much gratitude to Jim Brau for his encouragement and kindness toward me over the years. I am proud to be part of the UO HEP group headed by Jim, where I have spent the most pleasant and valuable years in my life. I would also like to thank David Strom for his help from time to time. Matt Langston has been an ideal officemate for the many years I have spent at SLAC as a student. His insistence on excellence and willingness to help has been becoming a model with which I will follow. It has been a sincere pleasure to work with and learn from Hwanbae Park,

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Forests are an important part of natural resources. Forest management is a management science integrating ecological, social and economic benefits. To tackle the problem of calculating carbon sequestration,the Forest Volume Method and InVEST model are good choices.Firstly, we collected forest data of 35 countries and carried out data pre-processing. After calculating carbon sequestration, we used a more intuitive world map to show the result. For the purpose of determining optimal forest management plan, we introduce a new indicator: Characteristics and Location of Forest index(CLF) to represent the characteristics of the country's basic forest resources. We use the coordinate (FVI, CLF) and the distance d to reflect the level of forest resources and forest management capacity.